Hunan Zekun Packaging takes you to analyze what is a stand-up pouch and its production process

The so-called self-supporting bag refers to a flexible packaging bag with a horizontal support structure at the bottom, which does not rely on any support and can stand on its own regardless of whether the bag is opened or not. Stand-up pouches are classified into ordinary stand-up pouches, stand-up spout bags, stand-up spout bags, mouth-like stand-up pouches, and special-shaped stand-up pouches. Now the editor will take you to learn about the self-supporting pouches produced by Hunan Zekun Packaging. The classification of self-supporting pouches will help you understand the self-supporting pouches better.

1. Ordinary stand-up pouch

Also known as side-seal stand-up pouch, it is a packaging method that cannot be resealed after opening.

2. Self-supporting nozzle bag

The self-supporting spout bag is made of safe, hygienic, non-toxic, new-type environmental protection, and non-toxic materials without BPA. Can be folded and curled many times, and can be used repeatedly. It is a packaging form that combines the bottle and the flexible packaging of the material, and the flexible packaging form that can be opened many times and then closed. It has been used for beverage packaging, liquid seasoning, jelly, etc. for a long time.

 3.Self-supporting edge-sealing bag

According to the different sealing types, it can be divided into four-side seal and three-side seal. Four-side seal means that after the product is packaged, the flexible package needs to be sealed with another side in addition to the zipper seal. When applicable, the edge needs to be torn.

Three-side sealing means that there is no re-sealing, only the zipper side sealing. The sealing strength of the three-side seal is lower than that of the four-side seal. It is commonly used to pack lighter products (such as candies, biscuits, etc.), and the four-side seal can also contain heavier products (such as rice, etc.).

4. Mouth-like stand-up pouch

The mouth-like stand-up pouch combines the convenience of a stand-up pouch with a nozzle and the cheapness of a normal stand-up pouch. That is, the function of the suction nozzle is realized by the shape of the bag itself. However, the mouth-like stand-up pouch cannot be sealed repeatedly. Therefore, it is generally used for the packaging of disposable liquid, colloid, and semi-solid products such as beverages and jelly.

5. Special-shaped stand-up pouch

That is, according to packaging needs, new self-supporting bags of various shapes, such as waist design, bottom deformation design, handle design, etc., are produced by changing on the basis of traditional bag types. It is the main direction of the value-added development of self-supporting bags.

Hunan Zekun Company provides high-quality and low-cost self-supporting bags and other packaging bag products, which are mainly used in food packaging, electronic packaging, facial mask and cosmetic packaging fields. Tea packaging bags and facial mask packaging bags are currently sold, and kraft paper and aluminum foil bags are currently relatively strong. The product.

Next, let’s talk about the characteristics of the self-supporting bag:

1. The self-supporting packaging bag has excellent sealing performance and composite material strength, is not easy to break and leak, has the advantages of light weight, low material consumption, and convenient transportation. At the same time, the packaging material has high performance such as anti-static, anti-ultraviolet, blocking oxygen and moisture, and easy to seal.

2. The self-supporting packaging bag is chemically resistant, shiny, partially transparent or semi-transparent. Most of them are good insulators.

3. The self-supporting zipper bag is light in weight and tight. It can be produced in large quantities at a low price.

4. The self-supporting zipper bag is multifunctional, practical, easy to color, and some high temperatures.

5. At present, the self-supporting pouch is fast and safe, and at the same time beautiful and generous. Safe and guaranteed Self-supporting packaging bags can ensure the safety of our products during the transportation process and reduce transportation risks.

6. At the same time, the self-supporting packaging bag has high heat-sealing fastness, pressure resistance and drop resistance, even if it is accidentally dropped from a height, it will not cause the bag body to rupture or leak, which greatly improves the product safety.

The production process of self-supporting pouch:

1. Preliminary preparation: install horizontal heat-sealing knife, bottom heat-sealing knife, strengthen heat-sealing knife, and install punching device.

2. Wear the film, set EPC, align the bag edge and pattern.

3. Adjust the bottom heat-sealing knife, enter the length and size of the knife, and the position and direction of the knife should be aligned. The above knife is the benchmark to adjust the knife, and check whether the round hole is round. Set the photoelectric sensor.

4. Install the bottom film and adjust it to fold in the middle. Punch the bottom film.

5. Adjust the horizontal heat sealing so that the position of the heat sealing knife is aligned with the printing position.

Sixth, adjust and strengthen the heat-seal block, and compensate the pressure at the intersection of the fourth layer.

7. Adjust the cutting knife and edge material cutting device.

8. Confirm and adjust the bottom punching position and bottom heat sealing position. Confirm and adjust the position of the transverse heat-sealing knife and strengthen the heat-sealing block. Confirm the heat sealing strength and adjust the heat sealing temperature.

The production factors of stand-up pouch:

1. The tension of the bottom film should not be too high. If the tension is too high, the round hole on the bottom surface will be deformed. The general tension is 0.05~0.2MPa.

2. The spring pressure of the strengthened heat-sealing block is adjusted to zero, so that only the self-weight of the heat-sealing device works.

3. Silicone plates generally use a hardness of 50 degrees, and use a 70-degree plate with a smaller sealing area.

4. When heat-sealing, the round hole on the bottom surface is oval, which can increase the waiting time by 100 minutes.

5. The bag making speed is generally 50~100 bags/min.

We will share the content of self-supporting packaging bags today. If you want to know more about food packaging bags, please follow our website: https://www.zekunpackaging.net/ or https://www.zekunpackaging. com/

Plastic limit order promotes the development of simple and environmentally friendly kraft paper bags

In recent years, with the global prevalence of the “anti-plastic” wind, environmentalists have begun to turn their sights on the old kraft paper bags. Starting in 2006, McDonald’s China has gradually implemented a kraft paper bag with thermal insulation properties to hold take-out food in all stores, instead of using plastic food bags. This move has also received positive responses from other businesses. For example, Nike, Adidas and other large plastic bag consumers have begun to use high-quality kraft paper bags instead of plastic shopping bags.

Kraft paper bags are made of composite materials or pure kraft paper. Yihe is generally non-toxic, tasteless, and non-polluting, in line with national environmental protection standards, with high strength and high environmental protection, and is currently one of the most popular environmentally friendly packaging materials in the world.

Kraft paper usually maintains its yellowish-brown color and is suitable for bags and wrapping paper. Depending on the nature and use, kraft paper has various uses. Kraft paper is a general term for a kind of paper, and there is no certain standard, and it is generally classified according to its nature and use.

According to the different colors, it can be divided into: primary color kraft paper, red kraft paper, white kraft paper, flat kraft paper, single-gloss kraft paper, two-color kraft paper, etc.

According to different uses, it can be divided into: packaging kraft paper, waterproof kraft paper, moisture-proof kraft paper, anti-rust kraft paper, pattern-making kraft paper, process kraft paper, insulating kraft paper, kraft stickers, etc.

According to the different materials, it can be divided into: recycled kraft paper, kraft core paper, kraft base paper, rough kraft paper, kraft wax paper, wood pulp kraft paper, composite kraft paper, etc.

The plastic restriction order has promoted the development of kraft paper. Now people are buying kraft paper bags, which are environmentally friendly and can be used for a long time. They have made a certain contribution to the country’s resources and environmental protection. Therefore, people advocate the use of kraft paper bags. Kraft paper bags are strong, durable, beautiful and environmentally friendly.

Qualified food packaging bags need to meet these key requirements

With the improvement of people’s living standards, all kinds of snack foods are more and more popular, and the demand is also increasing. It is well known that the selection of materials and production requirements of food packaging bags are different from ordinary packaging bags.

Specifically, the production requirements of food packaging bags must meet the following points: First, food packaging bags must be able to protect the packaged food, and therefore require high barrier properties, which can block water vapor, gas, grease, and organic solvents; secondly, According to the specific packaging requirements of food, certain conditions are met, such as anti-corrosion, anti-static, anti-electromagnetic radiation, etc.; in addition, food packaging bags must protect the packaged food from pollution and interference from external factors, and can extend the food shelf life.

In the selection of materials, the main materials and auxiliary materials used in food packaging bags cannot contain substances that are harmful to the human body, or the content is within the range allowed by national standards.

Due to the particularity of food-grade packaging materials, only by strictly complying with the production specifications, can the produced food packaging bag products be approved and put on the market.

All inner packaging bags that are in direct contact with food strictly comply with the production process of food-grade packaging bags, which are not only safe and hygienic, but also ensure the original taste and flavor; instead of food-grade packaging bags, the main difference is in terms of material composition It lies in the use of additives. If an opening agent is added to the material, it cannot be used for food packaging.

So how do we distinguish whether the packaging bag is non-food grade or food grade?

   When we get the packaging bag, we first observe that the new material has no peculiar smell, good hand feel, uniform texture, and bright color. Only when these are achieved can it be a safe and hygienic food-grade environmental protection bag.

What are the structures of high-temperature cooking bags? What are the advantages?

High-temperature cooking bags, also known as soft can packaging bags, are air-tight and light-shielding bags made of plastic film, metal foil or their composite materials. After melting and heat sealing, it is pressurized and heated for sterilization to contain processed food. Because of its long storage period, easy opening and convenient post-processing, it is very popular among customers. Let’s talk about the structure and advantages of high-temperature cooking bags:

According to the requirements of the user, the type of content and the form of circulation, the product structure of high-temperature cooking bags is generally divided into three categories: two-layer film, three-layer film and four-layer film structure. The two-layer film is generally BOPA/CPP, PET/CPP; the three-layer film structure is PET/AL/CPP, BOPA/AL/CPP; the four-layer film structure is PET/BOPA/AL/CPP, PET/AL/BOPA/CPP .

Advantages of cooking bags:

1. Maintain the color, aroma, taste and shape of food. The retort bag is thin and can reach the sterilization requirement in a short time, and preserves the original color, aroma, taste and shape of the food as much as possible.

2. Easy to use. The cooking bag can be opened conveniently and safely. When eating, put the food in boiling water together with the bag and heat it for 5 minutes to open and eat, even without heating.

3. Convenient storage and transportation. The retort bag is light in weight, can be stacked for storage, and occupies a small space. After packaging food, it occupies less space than metal cans, which can make full use of storage and transportation space and save storage and transportation costs.

4. Save energy. Due to the thinness of the cooking bag, the dead temperature of bacteria can be reached quickly in the bag when heated, and the energy consumption is 30-40% less than that of the iron tank. ⑤Easy to sell. The retort pouch can be divided or combined with different foods according to market needs. Customers can choose and buy at will. In addition, due to the exquisite decoration, the sales volume has also been greatly increased.

5. Long storage time. The food packaged in retort bags does not need to be refrigerated or frozen, and has a stable shelf life, comparable to metal cans, and is easy to sell and easy to use at home.

6. Lower manufacturing cost. The price of the composite film for manufacturing the cooking bag is lower than that of the metal plate, and the production process and the required equipment are much simpler, so the price of the cooking bag is lower.

Are you aware of the common printing methods for plastic packaging bags?

Plastic packaging bags can be seen everywhere in life and are indispensable supplies in life. With the improvement of living standards, people have higher and higher requirements for plastic packaging bags. Whether the design of the packaging bag is beautiful or not and the printing quality are good or bad, affect people’s intention to buy the products in the packaging bag.

No matter where you are, people can always see all kinds of beautifully printed plastic bags and packaging bags. With the advancement of science and technology and the continuous improvement of printing technology, the printing of plastic bags is becoming more and more exquisite. So what are the printing methods of plastic bags and packaging bags? Hunan Zekun Packaging Editor will give you a brief introduction.

(1) Gravure printing is mainly used for packaging and printing plastic film, which is used to produce various types of plastic packaging bags. Gravure printing is abbreviated as gravure printing, which is a type of packaging printing method among several major packaging printing methods. Gravure printing is a type of direct packaging printing method. It directly presses the printing ink contained in the gravure dents onto the substrate. The depth level of the printed image is determined by the size and depth of the dents. If the dents are larger Deeper, it contains more printing ink, and the ink layer left on the substrate after printing is thicker; conversely, if the dent is shallow, the amount of printing ink contained is less, and the substrate remains on the substrate after printing. The ink layer that comes down is thinner.

The printing plate of gravure printing is composed of the dents and the surface layer of the printing plate one after another corresponding to the text of the paper. During packaging printing, the printing ink is filled into the dent, and the printing ink on the surface layer of the printing plate is scraped off with an ink scraper. There is a certain pressure between the printing plate and the substrate to touch, and the printing ink in the dent is transferred to the substrate. To complete the packaging and printing. Gravure printing is a type of printing technology, because its printed products have thick ink layers, bright colors, high color saturation, high printing durability, relatively stable print quality, and fast packaging printing speed. It is used in packaging printing and text graphics. The publishing industry occupies a very important leading position.

(2) Letterpress printing is mainly flexographic packaging printing. The flexographic packaging printing printing plate uses a photosensitive resin material plate as the plate material, and is fixed on the printing plate cylinder with adjustable and repeatable size. A metal material ink roller with a computer-engraved ink hole is used to apply the ink, and the anilox ink transfer roller The ink delivery is controlled by another ink roller or ink scraper. Flexo packaging printing is the transfer of liquid or grease-like printing ink to various printing materials. It can print up to twelve colors at a time and is easy to use. It is a newly developed packaging printing method in the plastic printing industry. Flexographic packaging printing still belongs to the scope of letterpress printing, but because the whole process of printing plate, oil and printing pressure is different from traditional letterpress printing, it has a wide range of adaptability to substrates, and the cost of packaging printing is cheap. , And has excellent packaging and printing effects, widely applicable to all kinds of plastic packaging bags, flexible packaging, composite packaging, etc.

(3) Screen printing is mainly used for packaging and printing plastic films and various types of containers that have been extruded, and it can also print transfer materials for transferring text and pictures on plastic products with special shapes. Screen printing refers to the use of a screen as a plate base, and the use of light-sensitive printing to make a screen printing plate containing text and graphics. Screen printing consists of 5 basic elements, screen printing plate, squeegee, printing ink, packaging printing table and its substrate. Using the screen printing plate, part of the mesh of the image and text can pass the printing ink, and the part of the mesh of the non-text image cannot complete the packaging printing by the principle of the printing ink. When packaging printing, pour printing ink on one side of the screen printing plate, and use a squeegee to increase a certain pressure on the position of the printing ink on the screen printing plate. The scraper is squeezed from the mesh of a part of the text onto the substrate.

(4) Lithographic printing is a printing method that uses PS plates, plano gravure plates, multi-layer metal plates, albumin plates, lithographs, collo plates and other printing plates, using the principle of incompatibility between oil and water.

(5) Orifice printing is the use of transcription, hollow-out, silk-screen and other printing plates. Most of the printing methods use direct printing. Orifice printing can be done manually or machine printing. The orifice printing machine has two types: flat and curved. It can print on flat, curved, thick, thin, rough and smooth substrates.

(6) Special packaging printing Special packaging printing is different from other packaging printing methods of traditional packaging printing, including inkjet packaging printing, gold and silver ink packaging printing, barcode packaging printing, liquid crystal packaging printing, magnetic packaging printing, pearl packaging printing , Hot stamping electrochemical aluminum, etc.

Ok, let’s share the common printing methods of plastic packaging bags first. If you want to know more, please follow the website of Hunan Zekun Packaging Technology Co., Ltd.: https://www.zekunpackaging.net/ or https://www. zekunpackaging.com/

There are so many types of food packaging bags, which ones do you know?

Is food packaging design just for good-looking? Whether it’s inner packaging or outer packaging, are we all trying to achieve a beautiful effect? ​​Actually, it is not. Now when we design food packaging bags, we still want to play a good The protective effect.

Currently in the market, a variety of food packaging bags emerge one after another, especially food packaging bags. For ordinary people, they may not understand why a food packaging bag needs to have so many types. In fact, in the packaging industry, according to the type of bag, they also have names. Today, the editor of Ze Kun lists food packaging in daily life. Most types of bags, let you understand and feel at ease to eat!

The first type: three-side sealing bag

As the name implies, it is the most common type of food packaging bag that is three-sided sealing and leaving one opening to hold the product. The three-side seal bag has two side seams and one top seam. This kind of packaging bag can be folded or not. You can stand upright on the shelf when there are folds.

The second type: middle-sealed organ bag

The bag shape is square and three-dimensional, which has a larger capacity than a three-side sealed bag, and has a beautiful shape and pattern.

The third type: eight-side sealing bag

This is a bag type developed on the basis of a self-supporting bag. Since the bottom is square, it can also stand upright. This kind of bag is more three-dimensional, with three planes: front, side and bottom. Compared with self-supporting bags, eight-side sealing bags have more printing space and product display, which can better attract consumers’ attention.

The fourth type: self-supporting bag

The self-supporting bag-type food packaging bag is as easy to understand as its name. It can stand independently and stand on the container. Therefore, the display effect is better and more beautiful.

The fifth type: nozzle bag

The nozzle bag consists of two parts, the upper side is an independent nozzle, and the lower side is a self-supporting bag. This bag type is the first choice for packaging liquids, powders and other products, such as juice, beverages, milk, soy milk and so on.

The sixth type: special-shaped bags for food packaging.

According to the requirements of customers, we can produce packaging products with unique appearance.

Seventh: Self-supporting zipper bag

The self-supporting zipper bag, that is, a zipper that can be opened is added to the top of the package, which is convenient for storage and eating, and avoids moisture. This bag type has good flexibility, moisture-proof and waterproof, and is not easy to be damaged.

The eighth type: Back seal bag

Back seal bag is a type of packaging bag that is sealed on the back edge of the bag. This type of bag has no opening and needs to be torn by hand. It is mostly used for granules, candies, dairy products, etc.

The above types of bags basically cover most types of food packaging bags on the market. I believe that you will be able to handle all kinds of packaging bags with ease.

The selection of materials for frozen food packaging and the points that need to be paid attention to

Now, there are many types of frozen foods that can be seen in the market, because each kind of frozen food is aimed at different freezing needs, so now there are all kinds of frozen food packaging bags on the market, and the common frozen food packaging is all Which material structure should I choose? The following is explained by the editor of Hunan Zekun Packaging.

  1. PET/PE

This composite structure is relatively common in frozen food packaging, and has good moisture-proof, cold-resistant, low-temperature heat-seal performance, and relatively low cost.
 
2. BOPP/PE, BOPP/CPP

This kind of composite material structure is moisture-proof, cold-resistant, and has high tensile strength for low-temperature heat sealing, and the cost is relatively economical. Among them, BOPP/PE structure packaging bags have better appearance and feel than PET/PE structure, which can improve product quality.
 
3. PET/VMPET/CPE, BOPP/VMPET/CPE

Due to the existence of the aluminum-plated layer, the surface of this type of composite material is beautifully printed, but the low-temperature heat-sealing performance is slightly worse, the cost is higher, and the utilization rate is relatively low.
 
4. NY/PE, PET/NY/LLDPE, PET/NY/AL/PE, NY/PE

The packaging of this type of composite material structure is resistant to freezing and impact. Due to the existence of the NY layer, its puncture resistance is very good, but the cost is relatively high, and it is generally used for packaging angular or heavier products.
 
In addition, there is a simple PE bag, which is generally used as an outer packaging bag for vegetables and frozen frozen food. In addition to packaging bags, some frozen foods require blister trays. The most commonly used tray material is PP. Food-grade PP is hygienic and can be used at a low temperature of -30°C. There are also materials such as PET. As a general transport package, corrugated cartons are also a priority product for frozen food transport packaging due to their shock-proof, compressive performance and cost advantages.

Let’s talk about the main points that need to be paid attention to when choosing food freezing packaging bags:

1. Hygiene: From the perspective of safety, packaging materials that are in direct contact with food, such as plastic packaging bags, must reach food grade. Due to the packaging and transportation of frozen food, it is often difficult to ensure that the entire process is in a consistent low-temperature environment. Especially during the transfer and handling process, it is very likely that the temperature of the frozen food will rise significantly within a period of time. If the materials are not qualified, It is easy to breed bacteria. The appearance of packaging made of recycled materials or industrial-grade materials is not much different from that of food-grade materials, but because it contains excessive plasticizers and other substances, once used, it will cause great harm to human health.

2. Cold resistance: Frozen foods are usually stored and circulated at -18℃ or lower, especially some frozen foods with trays. During the production process, the food and trays are usually cooled rapidly at -30℃ or below. The center temperature of the product is below -18°C before packaging. In the case of a sudden drop in temperature, the mechanical strength of the packaging material also decreases, resulting in fragile packaging materials. Moreover, frozen food will inevitably suffer from shock, vibration, pressure and other environmental hazards during the transfer and transportation process. In addition, frozen foods such as glutinous rice balls and dumplings are hard in texture at low temperatures. It is easy to cause the packaging bag to rupture and crack. This requires good low-temperature performance of packaging materials.

3. Impact resistance: Frozen food is easily damaged by external forces during transportation, loading and unloading, and shelf placement. When the impact resistance of the packaging bag is poor, it is easy to break and open the bag, which not only affects the appearance of the packaged product , It will also contaminate the food inside. The impact resistance of frozen food packaging bags can be determined by the pendulum impact test.

Today we will share the contents of frozen food packaging bags here. If you want to know more about food packaging bags, please pay attention to the website of Hunan Zekun Packaging Technology Co., Ltd.: https://www.zekunpackaging.net/  or https://www.zekunpackaging.com/

When custom packaging plastic bags, you need to have these characteristics, what do you know?

In our daily life, when buying items needed at home, we can often see that most of the products are used in plastic packaging bags. Each type of plastic packaging bag is different, which is customized by manufacturers according to their own needs. Customizing plastic packaging bags is a very strict job. A good packaging bag needs to fully consider the needs of production, packaging, transportation, and sales. Hunan Zekun Packaging Technology Co., Ltd. has a professional R&D and design team, which can provide customers with bag design and free choice of packaging materials, and create unique plastic packaging bags for your products.

When customizing plastic packaging bags, customers pay more attention to price, but considering the different requirements of each customer for plastic packaging bags, such as different thicknesses, sizes, materials and printing colors, the prices are also different. Therefore, Zekun Packaging recommends clear requirements when making plastic bags in order to calculate an accurate price.

For customized plastic packaging bags, the size of the packaging bag should be confirmed. A more feasible method is to refer to product packaging bags in the same industry. Some special bag types, such as flanging bags and flat bottom bags, also need to measure the size of the flanging and the bottom of the bag.

The following introduces these characteristics when customizing plastic packaging bags:

1. Lightweight, transparent and soft;

2. It has good air tightness and heat sealability;

3. It is moisture-proof, gas-proof, UV-proof, heat-resistant, and cold-resistant;

4. It also has good dimensional stability, stable chemical properties, excellent chemical resistance and grease resistance;

5. It has tear resistance, acupuncture resistance, fatigue resistance, impact resistance, friction resistance, and aging resistance;

6. Excellent mechanical processing adaptability;

7. Exquisite printing and good visual experience.

When customizing plastic packaging bags, the model size can be determined by yourself, because every different merchant has different products. Take the convenience bag in the supermarket as an example. Generally speaking, there are three models of large, medium and small, and these models are not completely unified by the manufacturer. Sometimes the model can be adjusted according to the specific needs of the supermarket. Moreover, convenience bags in supermarkets must be printed with the national unified chain logo, food safety bags, and even food safety-related logos before they can be put into use.

When making custom-made plastic packaging bags, it is also very important for its entire design. Each of our businesses will have its own different characteristics, and will also have its own different signs. So when making plastic bags, I hope to put my own characteristics and logos directly in the plastic packaging bags, which is also a kind of advertising. The content introduced above is to pay attention to some things when customizing plastic packaging bags.

In addition to these aspects, it is also very important to choose a regular plastic packaging bag manufacturer. Only regular plastic packaging bag manufacturers can guarantee that customized plastic packaging bags can be put into market use after production and are safe, especially those involving food.

To learn more about food packaging bags, please follow the official website of Hunan Zekun Food Packaging Bags: https://www.zekunpackaging.net/ or https://www.zekunpackaging.com/

The price of vacuum packaging bags depends on these factors

We often receive emails from customers about vacuum packaging bags. How much is a vacuum packaging bag? I believe that many customers will ask this question about this problem. Customers often shop around before buying and choose cost-effective vacuum packaging bag manufacturers. Do you really understand the question of how much vacuum packaging bags are? Below, Zekun Packaging will provide you with an in-depth analysis of how much the vacuum packaging bag is!

When it comes to the use of vacuum packaging bags, everyone knows that vacuum packaging bags have the functions of moisture-proof + anti-static + explosion-proof + anti-corrosion + heat insulation + energy saving + single perspective + ultraviolet light + small volume ratio + no pollution + high barrier, etc., so they are practical Used in various industries such as food, photoelectric, industry and so on. So how much is the vacuum packaging bag? There is no fixed number to explain, because the price is based on the material, size and MOQ of the vacuum packaging bag. The price of the vacuum packaging bag is also different. Specifically, the following factors affect the vacuum packaging. How much is the bag:

1. How much the vacuum packaging bag is related to the material of the vacuum packaging bag: Generally, transparent vacuum packaging bags are relatively more affordable than aluminum foil vacuum packaging bags, while composite vacuum packaging bags are more expensive than ordinary vacuum packaging, so the main reason is Choose the material of the vacuum packaging bag. When choosing the vacuum packaging bag for the company’s products, you must first communicate with the vacuum packaging bag manufacturer to customize the vacuum packaging bag most suitable for your company’s products.

2. How much the vacuum packaging bag is related to whether the vacuum packaging bag is printed: the price of the printed vacuum packaging bag is naturally higher than that of the blank vacuum packaging bag; in terms of printing vacuum packaging bags, the copper plate printed vacuum packaging bags of large machines are The price of vacuum packaging bags printed on copper plates is higher than that of small machines. Generally speaking, the pictures of vacuum packaging bags printed on copper plates made by large machines will be clearer and more beautiful. It is recommended to choose copper plates made by large machines.

3. The price of the vacuum packaging bag is related to the minimum order quantity of the specifications and dimensions of the vacuum packaging bag. Obviously, the price of vacuum packaging bags with large specifications and thicker thickness is higher; and in line with the market principle of small profits but quick turnover, the more customized quantity, the price of vacuum packaging bags will be relatively more affordable.

4. How much the vacuum packaging bag is related to the raw material of the vacuum packaging bag: Generally speaking, the raw material nylon film in the vacuum packaging bag is more expensive than composite nylon if it is printed and reproduced. Biaxially oriented nylon film is more expensive than single The price of stretched nylon film is high. Choose which material is suitable for your own product packaging requirements and save packaging costs.

5. How much the vacuum packaging bag is related to the raw material manufacturer and origin of the vacuum packaging bag.

The above is all of the factors that determine the price of our vacuum packaging bags. If you want to know more about food packaging bags, please follow the official website of Hunan Zekun Food Packaging Bags: https://www.zekunpackaging.net/ or https://www .zekunpackaging.com/

How to determine whether the food vacuum packaging bag meets the standard? Need us to test

In recent years, with the gradual development of the food industry, especially the widespread development of ready-to-eat portable foods such as cooked food, vacuum packaging bags have also made considerable progress. We can see all kinds of cooked food products when we walk into the supermarket. Without opening the vacuum packaging bag, the quality of vacuum packaging lies in the manufacturing process of the plastic bag factory. The hygienic quality of the food vacuum packaging bag is directly related to the safety of the food in the package. It is necessary to ensure that the raw materials and additives used must meet the quality requirements Management system. National standards are strictly enforced to strengthen inspection and supervision of food packaging, prevent unqualified food packaging from entering the market, and strengthen management to ensure the healthy development of packaging.

The main inspection items for food vacuum packaging bags are:

1. The appearance must not have bubbles, perforations, water lines, plastic defects, etc.

2. The deviation of specifications, length, width and thickness are within the specified range.

3. The stretched length and fracture growth rate of the packaging bag are all necessary items for packaging bag inspection.

4.Penetration inspection Generally, it is recommended that customers use the colored penetration method for inspection. The process is to add colored bag surfactants to the vacuum bag, spread the bag body on the filter paper, and observe whether the filter paper is contaminated by colored liquids after 5-10 minutes. If there is no contamination, the bag body will be turned over for inspection.

5. Vacuum bag pressure test. This is very simple, just use the weight squeeze method to test, put the plastic bag on the table, and add weight to squeeze. The product that remains unchanged for 3-10 minutes is a qualified product.

6.The sealing performance can be tested in two ways: by evacuating the vacuum chamber to generate a pressure difference between the inside and outside of the sample immersed in water, and observing the escape of gas inside the sample to determine the sealing performance of the sample ; By evacuating the vacuum chamber to generate a pressure difference between the inside and outside of the sample, observe the sample’s shape recovery after expansion and release of the vacuum, so as to determine the sealing performance of the sample.

The quality of food vacuum packaging bag printing will directly affect the sales performance of food in the market. Food vacuum packaging bag printing is not complicated. It mainly depends on whether the quality of the ink is selected correctly. Good ink is used in the printing process or packaging. In, there will be no quality problems. Food vacuum packaging bags use medicines to indicate food-related information, and poorly-printed packaging bags affect people that the food is not very good. Therefore, the printing should be beautiful and direct to reflect the food.

How to judge whether the quality of ink is up to standard:

1. High adhesion, the ink will not fall off by itself.

2. The pattern of the ink should be clear and the color contrast should be moderate.

The above is all about how to determine whether the food vacuum packaging bag meets the standard. If you want to know more about food packaging bags, please follow the official website of Hunan Zekun Food Packaging Bag: https://www.zekunpackaging.net/ or https: //www.zekunpackaging.com/

The information printed on food packaging bags should strictly comply with the Food Sanitation Law. What information do we need to label?

The Food Hygiene Law stipulates that fixed-packaged foods must be marked on the packaging label or product manual according to different products in accordance with the regulations: product name, place of origin, factory name, factory address, contact information, production date, batch number or code, specification or weight, etc., Formula or main ingredients, shelf life, eating or using methods, etc. Production license number, sanitation license number, if there is system certification, also mark it, and implement the standard number.

The information printed on the food packaging bag strictly implements the Food Safety Law. As long as the food is purchased in a regular store, the information on the packaging bag has great reference value. Through the pre-sale packaging information, we can see the nutrient composition table, the weight, the manufacturer’s sc standard implementation standards, etc. In order to accurately grasp the information on food packaging bags, we can have a better user experience. For example, a dieter can judge whether it is a polysaccharide and high -calorie food according to the nutritional composition table on the packaging bag in order to choose a suitable product. In other words, they have achieved their goal of losing weight and have enjoyed delicious food.

Food packaging bags commonly used in life bring convenience to our lives, but there are also some information that must be paid attention to. The information on food packaging bags is the most effective way to accurately convey product information. This is to truly convey the image of the product and also to allow consumers to choose food more clearly and confidently. Therefore, the information that manufacturers need to pay attention to when printing is as follows:

  1. The most important information on food packaging bags is the production date and shelf life. Everyone should pay attention to food and food before buying food. Food is expired or expired. Expired food is resolutely refused to eat, which is more harmful to the body. The quality of pre-packaged food should be maintained under the storage conditions specified on the label. During this period, the product is fully applicable. When selling, please keep the label and do not explain or explain its unique quality.

2. Nutrition label can intuitively understand the energy, carbohydrate and protein of food. Quality, fat, sodium and other nutrients, choose the right two delicious foods according to your physical condition.

3. The ingredient list, that is, any substances used in food manufacturing or processing, and the substances present in the product (including modified forms), including food additives. After understanding the ingredient list, understand the ingredients and taste of the food, and whether it is suitable for you.

4. Attention and use method and manufacturer and other information. The precautions generally point out the allergens contained in the food and the applicable people, as well as the precautions in the process of eating and storage. If there are any problems with the food, you also need to contact the manufacturer. In fact, brands and manufacturers are also very important in the daily process of buying food. After all, the choice of imported food should be cautious.

The General Rules for Nutrition Labeling of Prepackaged Foods came into effect on January 1, 2013. After the general rules are implemented, foods with non-standard nutrition labels shall not be sold.

Prepackaged foods refer to foods that are pre-packaged in quantitative quantities or prepared in packaging materials and containers. The “General Principles of Nutrition Labeling of Prepackaged Foods” includes a list of nutritional ingredients, a nutritional claim, and a functional claim of nutritional ingredients.

Among them, the nutrient composition table is a normative table with indicators including the name, content and percentage of the nutrient reference value (NRV) of the food. The mandatory label content includes energy and the content values of the four core nutrients of protein, fat, carbohydrate and sodium. And its percentage of nutrient reference value (NRV).

This means that some foods that are named “high calcium”, “low sugar”, “skim”, etc., but cannot explain their own nutritional content, must write these elements clearly in the label in the future, and the concept must not be blurred. , To deceive consumers.

“Various” food packaging aluminum foil bags, understand the difference between washing aluminum bags and ordinary aluminum bags

Last time we talked about the difference between aluminum-plated food packaging bags and pure aluminum packaging bags. Today we talk about the difference between washed aluminum bags and ordinary aluminum bags. Aluminum foil bags are not simple at all. Would you like to know more? Please listen to the breakdown below:

Washing aluminum bag is also called partially hollowed out aluminum-plated bag. It is a partially transparent composite bag made up of plastic film and partly hollowed out aluminum-plated film (or part of aluminized layer in addition to aluminum). Cleaning aluminum is to remove or wash off the film. Partially aluminized layer. At present, the aluminum washing bag is a packaging bag product with high printing requirements at home and abroad, and a beautiful design effect. It is also an advanced anti-counterfeiting packaging popular in the world. It is generally used for outer packaging of clothing, hardware, electronics, toys, and food.

Next, Hunan Zekun Packaging explained the difference between down-washed aluminum bags and ordinary aluminum bags based on years of experience in the production of high-quality aluminum bags.

Ordinary composite aluminized bag is the whole bag or the front (or back) composite aluminized film of the whole bag. The aluminum washing bag is different, as long as you want which part of the bag has aluminum gloss effect, which part is transparent visual effect, You can design and produce it, not limited to a certain position or a certain regular pattern.

In terms of printing, the washing aluminum bag has a better printing effect than the ordinary composite aluminized bag, and in terms of decoration grade, it is more beautiful and beautiful than the ordinary composite aluminized bag. At present, there are many different methods and operating experience in the aluminum cleaning process, but few companies can achieve large-scale and efficient production. Now, some users have evolved this process into a transfer process, such as the aluminum-plating water washing process, which uses the aluminum water washing process in the cold tear transfer process to achieve a new anti-counterfeiting and packaging display effect. The aluminum washing process of aluminum film is also called dealuminization process, and some are also called partial hollowing dealumination process, which is called more often.

Generally speaking, aluminum washing bags have the characteristics of clear pictures and texts, high precision, strong three-dimensional effect, seemingly layered, colorful, smooth surface, and high wear resistance. From the perspective of commercial security, it is also a form of packaging with strong anti-counterfeiting, which helps to improve product quality and added value, and has strong market competitiveness.

If you want to know more about packaging bags, please pay attention to Hunan Zekun Packaging (https://www.zekunpackaging.net) or (https://www.zekunpackaging.com/)

What is an aluminized bag? Brief analysis of the difference between aluminum plating and pure aluminum

Everyone is relatively familiar with aluminum foil packaging bags, but they don’t know much about aluminum-plated bags, and they feel indistinguishable. So, what is aluminum-plated packaging bags? What is the difference with aluminum foil packaging bags?

According to Hunan Zekun Packaging, aluminum-plated bags are a kind of aluminum foil bags. Aluminum foil bags can be divided into pure aluminum bags and aluminum-plated bags. The appearance of aluminum-plated bags is opaque, silver-white, and has anti-gloss. It has good barrier properties, heat sealing properties, shading properties, high temperature resistance, low temperature resistance, oil resistance, fragrance retention; non-toxic and tasteless; softness and other characteristics. It has a certain degree of light resistance, and it can still transmit a certain amount of light compared with aluminum foil bags. The aluminum-plated bag has a certain degree of opacity and good light reflection performance, so the printing effect of the bag is better, the color is fuller, and the gloss is better. Compared with aluminum foil bags, bags are less prone to wrinkles.

The aluminum-plated bag adopts a four-layer structure with good toughness, high strength, and good water and oxygen barrier functions. The aluminum-plated bag mainly has the advantages of anti-static; vacuum-proof; light and oxygen; waterproof and moisture-proof; anti-volatile; high tensile strength; high-grade and exquisite packaging. The aluminum-plated bag can be used for moisture-proof, light-proof and vacuum packaging of food, pharmaceutical raw materials, biological chemicals, chemical raw materials, pharmaceutical intermediates, and lithium iron phosphate cathode materials.

Colored aluminum-plated bags are currently very popular gift packaging materials in the world. The outer layer is a color aluminum-plated film. The film adopts high-vacuum evaporation technology, has bright metallic luster, excellent gas and light barrier properties, and good moisture resistance. , Heat resistance, puncture resistance; excellent adaptability to printing and lamination. The inner transparent PE film has good heat sealability, which can ensure the firmness of the sealing edge. Generally, the color aluminized bag is in the bag The mouth has self-adhesive strips or easy-to-tear strips to facilitate packaging. The aluminum-plated bags are of high quality and bright in color. They are widely used in the packaging of various gifts, handicrafts and other industries that require environmental protection.

Aluminum foil bag packaging usually refers to aluminum-plastic composite vacuum packaging bags. This type of product is suitable for moisture-proof, light-proof and vacuum packaging of large-scale precision machinery, chemical raw materials, and pharmaceutical intermediates. It mostly adopts three-layer or four-layer structure, which has good water and oxygen barrier functions. Unrestricted, you can customize packaging bags of different specifications and styles, and can be made into flat bags, three-dimensional bags, organ bags, zipper bags and other styles. Products need to be tested by GB and ASTM standards. Products meet environmental protection requirements (third-party test reports can be provided). Products meet the most stringent environmental protection standards for packaging materials in the European Union and North America.

Aluminum foil bags are divided into pure aluminum bags and aluminum-plated bags. How to distinguish aluminum-plated bags and pure aluminum bags in daily life? There are a few points to summarize:

1. In terms of material, the pure aluminum bag is pure aluminum with high purity and is a soft material; the aluminum-plated bag is mixed with composite materials, which is a brittle material.

2. In terms of cost, the price of pure aluminum bags is higher than that of aluminized bags.

3. In terms of performance, pure aluminum bags have better moisture-proof and cooling effects than aluminum-plated bags, pure aluminum bags are completely protected from light, and aluminum-plated bags have a shading effect.

4. In terms of use, pure aluminum bags are more suitable for vacuuming, such as cooked food, meat and other products, while aluminum-plated bags are suitable for tea, powder, electronic parts, etc.

5. The inside of the bag is facing the light or the sun, the light that can be seen through the bag is the aluminum foil, the invisible is the pure aluminum foil

Today, the editor of Zekun will share this with you. For more information, please pay attention to our website:https://www.zekunpackaging.net/  or    https://www.zekunpackaging.com/

Several major materials and advantages and disadvantages of plastic packaging bags

Today, the editor of Zekun takes everyone to understand several materials of plastic packaging bags and the differences between these materials.

The plastics commonly used in packaging mainly include polyethylene and polypropylene. Polystyrene, polyvinyl chloride, polyurethane, phenolic resin.

1. polyethylene (PE)

Polyethylene is a high-molecular polymer of ethylene. It is a kind of thermoplastic. According to its industrial production method, there are high-pressure, medium-pressure, and low-pressure polymerization methods. Different production methods have very different molecular structures, and product properties also vary with molecular structures.

Polyethylene is a milky white waxy solid, lighter than water, softer, good water resistance, low temperature resistance, odorless, non-toxic, poor heat resistance, poor film air tightness, and sensitive to ultraviolet rays. It is easy to oxidize and age, and the thermal shrinkage changes greatly, and the printing performance is poor. According to its density. It can be divided into high-density, medium-density, low-density polyethylene, and linear low-density polyethylene. 

2. Polypropylene (PP)

Polypropylene is a by-product propylene from petroleum refining. The refined propylene monomer is polymerized under the catalysis of a catalyst and then separated from the polymer. The molecular weight is 100,000 to 500,000, and the density is very small, which is the smallest among known plastics; non-toxic, odorless, high transparency, mechanical properties, surface strength, friction resistance, chemical corrosion resistance, and moisture resistance are all good; at room temperature Above, the impact resistance value is large, but the low temperature impact resistance value is small; it is prone to static electricity, and the printing performance is not good. Polypropylene has a wide range of raw materials, low price, and wide adaptability of performance. It is widely used in the food industry. It is mostly used to make films and composite films. It has good transparency and surface gloss, and can withstand temperatures of 120 degrees; it can be made into packaging boxes, blow molded into plastic bottles, and certain fillers can be added to make certain machine parts.
  

3. Polystyrene (PS)

Polystyrene is ethylene and benzene catalyzed by anhydrous aluminum trioxide, undergoes an alkylation reaction to generate ethylbenzene, and then undergoes catalytic dehydrogenation to obtain styrene. Styrene monomer is heated and polymerized into polystyrene in an aqueous suspension of an appropriate amount of initiator (benzoyl peroxide) and dispersant (polyvinyl alcohol). Polystyrene is a colorless, transparent, non-ductile thermoplastic; non-toxic, odorless, odorless, good colorability, moisture permeability is greater than polyethylene, low moisture absorption, dimensional stability, good gloss; processing properties Good, low cost; mechanical properties increase with the increase of molecular weight; low heat resistance, can not be used in boiling water; low temperature resistance, can withstand low temperature of -40 ℃; good indoor aging resistance; to alcoholic organic solvents , Mineral oil has good tolerance, acid and alkali resistance is also very good.

Due to its superior performance, low price, and wide application, polystyrene can be made into films and containers, and is widely used in the food industry; the shrinkage rate can reach 60-70%, and it is a good material for making shrink packaging and has good insulation properties. It can make a variety of telecommunication parts; it can also make various machine parts, toys, daily necessities, etc.; adding foaming agent to polystyrene can make foam plastic, which is a good cushioning packaging material.

4. Polyvinyl chloride (PVC)

“Polyoxyethylene” is a suspension polymerization or emulsion polymerization of vinyl chloride to produce polyvinyl chloride through the action of primers. It is light brown, transparent, good toughness, density 1.4g/cm; it has good chemical stability, is not easy to be corroded by acid and alkali; air tightness, water resistance, heat sealing performance, good printing performance, production energy consumption Less, cheap; mechanical strength, wear resistance, pressure resistance are better than polyethylene and polypropylene. The main disadvantages are poor thermal stability, easy decomposition when heated, and release of hydrogen chloride gas. Due to the different types and quantities of additives, such as plasticizers and stabilizers, polyvinyl chloride can be made into different products and can produce hard products, such as hard pipes, building materials, etc.; it can be used to make artificial leather, wire and cable insulation, Plastic floor, etc. Its main function in packaging is to make a film, which is divided into three types: soft film, hard film, and shrink film. The soft film has a soft texture and good heat-sealability, suitable for high-frequency sealing; low tensile strength, high tear strength; poor sliding properties, and poor processing performance.The tensile strength and tear strength of the hard film are large, the texture is harder, and the elongation is small; the moisture permeability is small, the gas barrier property is good, and the sliding property is good; the printing adaptability is good, but the appropriate ink solvent must be selected; It has poor temperature resistance and becomes brittle at low temperatures. The shrink film has good transparency, low air permeability, shrinks when heated, a wide shrinking temperature range, and a large shrinkage rate. It is a good heat shrinkable packaging material. According to different production processes, it can be divided into dry stretching. Tubular stretching and vertical and horizontal unidirectional stretching and other varieties.
  

5. Polyester (PET)

“Polyester” is a polycondensation product of terephthalic acid and ethylene glycol. Compared with other plastics, polyester has excellent barrier properties, such as carbon dioxide, oxygen, water and fragrance, etc. It can be well barrier; with excellent mechanical properties, it has high strength, compression resistance and impact resistance.; Good chemical stability, resistance to acid and alkali corrosion; high transparency, good gloss and optical properties; non-toxic, tasteless, in line with food hygiene standards; its structure has ester groups, so the printing performance is good. Polyester is a unique and versatile packaging material. Film can be made into packaging containers such as bottles, cans, cups, etc., and it can also be used as a dual-purpose bakeable tray.

6. Phenolic plastic (PF)

Phenolic resin is formed by polycondensation of phenols (mainly phenol) and aldehydes (mainly formaldehyde). Depending on whether the catalyst is acidic or basic, the ratio of phenol to formaldehyde is different. Thermoplastic resin or thermosetting resin can be obtained. The two can be transformed into each other under suitable conditions. In practice, thermosetting resins are often used. Phenolic resin has good mechanical strength and thermal strength; good moisture resistance and corrosion resistance; easy processing and low price.

After adding different fillers and curing agents to the phenolic resin, different phenolic plastics can be produced. Various sheet fillers are added to thermosetting resin, and laminates with various properties can be obtained after lamination; adding foaming agent can make phenolic foam; when phenolic plastic is used for packaging, phenolic resin is mixed with filler and cured Powder, coloring agent, etc. are made into molding powder, and then molded into bottle caps, machine parts, daily necessities, and some packaging containers.   

Phenolic plastic products have good chemical stability; excellent heat resistance; high mechanical strength and wear resistance; not easy to deform, but poor elasticity; good electrical insulation; monotonous color, mostly dark red or black. Since its main raw materials are phenol and formaldehyde, which are both toxic to a certain extent, it is not suitable for food packaging materials.
  

7. Polyamide (PA)

Polyamide is commonly known as “nylon”, which can be obtained by polycondensation reaction of dibasic acid and dibasic acid. Polyamide is non-toxic, colorless and transparent; it has good abrasion resistance. Strong impact toughness, excellent mechanical properties; good light resistance, not easy to aging under light; good oil resistance, good chemical stability, but not resistant to alcohols, formic acid and phenol; good air tightness; high temperature adaptability, which can be in -40 Used in the range of ~100 degrees; good printability and decoration; high moisture absorption.
  Polyamide has a wide range of uses, such as bearings, gears, pump blades, and auto parts. Its application in packaging is mainly flexible packaging. It can be made into film for food packaging and can also be used to make packing belts and ropes. Its sturdiness is better than polypropylene packing belts.          

8. Urea-formaldehyde plastic (UF)

Urea-formaldehyde plastic, commonly known as “electric jade”, is made of urea and formaldehyde as raw materials, through polycondensation reaction to obtain urea-formaldehyde resin, and then add fillers, colorants, lubricants, plasticizers, etc., processed into compression molding powder (electric jade powder), and then It is heated and molded into products. It has large surface hardness, certain mechanical strength, not easy to deform, but relatively brittle; it is odorless, tasteless, strong in coloring power, bright in color, and looks like beautiful jade; it has good heat resistance, not easy to burn, acid and alkali resistance, and water resistance. Poor, high water absorption, good electrical insulation. Urea-formaldehyde plastics can be made into a variety of products, such as daily necessities and electrical components. The package can be made into beautiful packaging boxes, packaging trays, bottle caps, etc.; because formaldehyde has a certain toxicity, it is not suitable for food packaging. Adding a foaming agent to the urea-formaldehyde resin and using a mechanical method to make it foam, the urea-formaldehyde foam can be obtained. It is lightweight, inexpensive, good in heat preservation, and corrosion resistant, and is a widely used cushioning packaging material.
  

9. Melamine plastic (ME)

Melamine plastic and urea-formaldehyde plastic are both amino plastics. It is made of resin obtained by polycondensation reaction of melamine and formaldehyde as the main component, adding fillers, lubricants, coloring agents, hardeners, etc., and is formed by hot pressing. It is also a thermosetting plastic.

Melamine plastic is non-toxic, odorless, tasteless, and has good hygienic properties; it has high mechanical strength, good surface hardness, and is not easy to deform; the surface is smooth and feels like porcelain; it has strong impact resistance and pollution resistance; good chemical stability. Melamine plastic can be used to make packaging containers of various colors including food packaging.

10. Polyvinyl alcohol (PVA)

Polyvinyl alcohol is a hydrolysis product of polyvinyl acetate. It is transparent, non-toxic, and tasteless; it has excellent gas barrier properties, water resistance and oil resistance; good chemical stability; good printability, no static electricity; good mechanical properties.

Polyvinyl alcohol mostly uses its film in packaging, which can be used for food packaging. It has a significant effect on preventing oxidative discoloration, taste change and deterioration of food, and maintaining the freshness of food; it can also package other products, such as chemical products.

11. Polycarbonate (Pc)

“Polycarbonate” is a general term for resins containing carbonate structure in the molecular chain, and usually refers to bisphenol A type polycarbonate. It is colorless and transparent, has good gloss; it has excellent heat resistance and cold resistance, and can be used for pressure sterilization; it has high mechanical strength. It can be side by side with polyester and nylon; it has excellent impact toughness, and the product is not easy to break under impact; it has low water absorption, moisture absorption, and air permeability; it has good chemical resistance and can prevent ultraviolet rays from penetrating non-toxic, odorless, and tasteless; The molding performance is good, and general molding methods can be used. The precision of the molded product is very high. But the heat sealing performance is poor.

Polycarbonate is an engineering plastic with excellent comprehensive properties, which can be used to make various gears, machine parts, etc.; it can be made into films for packaging food and other items. When sealing is required, composite films are often used to improve heat sealing performance. ; Can also be made into various packaging containers.

12. Polyvinylidene chloride (PVDC)

“Polyvinylidene chloride” is a homopolymer of vinylidene oxide. It is non-toxic, tasteless and transparent; it has high mechanical strength. Good toughness; resistance to oil and organic solvents; good heat shrinkability and self-adhesiveness, easy adhesion between films; excellent air tightness and moisture resistance. However, it has poor machinability, poor thermal stability, is not easy to heat seal, and easily decomposes when exposed to ultraviolet rays.

The application of polyvinylidene chloride in packaging is mainly to make food packaging film, which can be used as a sealed package, which can effectively prevent food from absorbing moisture. Oil and fat foods are oxidized to ensure long-term food quality; it can be used as sterilized food packaging because it can be heat sterilized; it can also be used as a packaging material for household daily use.

13. Polyurethane (PVP)

“Polyurethane” is also called polyurethane, which is made by the reaction of isocyanate and hydroxyl compound. The main characteristics of polyurethane are good wear resistance, excellent low temperature resistance, outstanding oil resistance and chemical corrosion resistance. Polyurethane is mainly processed into foam plastics, and foams with different hardness and softness can be obtained by changing the raw materials and the ratio. Soft products have good toughness, good elasticity, and oil resistance. They are the main varieties of polyurethane foam and are widely used in packaging to make cushioning materials such as cushions. Rigid products are heat-resistant, cold-resistant, heat-insulating, and have excellent shock resistance. They are widely used in the packaging of precision instruments and meters. The production of polyurethane foam is simple. Easy to operate, low cost, good shockproof performance, can be prepared at room temperature, especially can be prepared by on-site foaming, which brings great convenience to packaging.

Ok, let’s share common knowledge about packaging bags here. If you want to know more, please follow the website of Hunan Zekun Packaging Technology Co., Ltd.: https://www.zekunpackaging.net/ or https://www.zekunpackaging.com /

What are the functions of the dazzling array of food packaging bags?

In our daily life, we are often attracted by various food packaging bags on the shelves of supermarkets and shopping malls. Packaging bags are a type of packaging design. In order to keep fresh and store food in life, product packaging bags are produced. Food packaging bags refer to film containers that directly contact food and are used to hold and protect food.

The functions of food packaging bags are:

1. Physical protection: Food stored in plastic packaging bags should avoid extrusion, impact, temperature difference and other phenomena.

2.Shell protection: The shell can separate food from oxygen, water vapor, stains, etc., and leakage prevention is also a necessary factor in packaging design. Some packages include desiccants or deoxidizers to extend shelf life. Vacuum packaging or removing air from the packaging bag is also the main food packaging method. Keeping the food clean, fresh and safe during the shelf life is the main function of the packaging bag.

3. Put it in the same bag: Putting small objects of the same kind in a bag is a good way to save volume. Powder and granular objects need to be packed.

4. Convey information: packaging and labels tell people how to use, transport, recycle or dispose of packaging or food.

5. Marketing: Marketing often uses packaging labels to encourage potential buyers to buy products. For decades, packaging design has become an important and constantly changing phenomenon. Marketing communications and graphic design are applied to the outer box and (for some reason) the highlights of the sales presentation.

6.Safety: Packaging can play an important role in reducing transportation safety risks. Packaging bags can also prevent food from being classified into other commodities. Food packaging can also reduce the possibility of food being illegally eaten. Some food packaging is sturdy and has anti-counterfeiting signs to protect the interests of businesses from loss. The packaging bag can have labels such as laser marking, special color, and SMS authentication. In addition, in order to prevent theft, retailers put electronic surveillance labels on food packaging bags, waiting for consumers to take them to the outlet of the store to demagnetize.

7. Convenience: The package may have facilities for loading and unloading, stacking, display, sale, opening, reloading, use and reuse.

8. Partial control: single packaging helps to accurately control the overall situation. For example, salt can be packaged to understand inventory. This also makes it easy to calculate recent sales, such as dairy companies sending and recycling milk bottles instead of letting consumers fill them up.

If you want to know more about packaging bags, please pay attention to Hunan Zekun Packaging (https://www.zekunpackaging.net/ or https://www.zekunpackaging.com/)