Aluminum foil bag, also known as pure aluminum bag, is a bag made by a bag making machine after compounding and combining various plastic films. Aluminum foil bags mostly use a four-layer structure, which has good water and oxygen barrier functions. The products must be tested by GB and ASTM standards, and the products meet the requirements of environmental protection (third-party test reports can be provided), and the products meet the most stringent environmental protection standards for packaging materials in the European Union and North America. Used to package food, pharmaceutical industrial products, daily necessities, etc. Hunan Zekun Packaging is a professional aluminum foil bag packaging bag manufacturer in China. It is free to design, customize with drawings, support printing, wholesale from manufacturers, and take samples for free.
1. What are the characteristics of aluminum foil as a packaging material?
Features of aluminum foil bag: opaque, silvery white, with anti-gloss, good barrier property, heat-sealing property, light-shielding property, high temperature resistance, low temperature resistance, oil resistance, fragrance retention; non-toxic and tasteless; softness and other characteristics. Aluminum foil bags mostly use a four-layer structure, which has good water and oxygen barrier functions. Unrestricted, packaging bags of different specifications and styles can be customized, and can be made into flat pockets, three-dimensional bags, organ bags and other styles.
2. the classification of aluminum foil bags:
There are no restrictions on aluminum foil bags, and packaging bags of different specifications and styles can be customized, and can be made into food aluminum foil bags, medicinal aluminum foil bags, military aluminum foil bags, electronic aluminum foil bags, health product aluminum foil bags, intermediate aluminum foil bags, vitamin aluminum foil bags Bags, raw material aluminum foil bags, adhesive aluminum foil bags, particle aluminum foil bags, powder aluminum foil bags, energy-saving aluminum foil bags, moisture-proof aluminum foil bags, high temperature resistant aluminum foil bags, 25KG aluminum foil bags, and other aluminum foil bags.
3. The role of aluminum foil bags
Aluminum foil bags can be used for various circuit board packaging, electronic product packaging, precision machinery accessories packaging, consumer goods packaging, various food packaging, industrial product packaging, etc. Scope of application of aluminum foil food packaging: milk, rice, meat products, dried fish, aquatic products, preserved meat, roast duck, roast chicken, roast pig, quick-frozen food, ham, cured meat products, sausages, cooked meat products, pickles, bean paste, Preservation of fragrance, quality, taste and color of seasonings.
Advantages of aluminum foil bags:
Some cooked foods in life are easily deteriorated during carrying. The vacuum packaging of aluminum foil bags can well prevent the entry of air, resist external pressure, and keep the food fresh.
Disadvantages of aluminum foil bags:
The aluminum foil bag material has poor heat resistance, poor air tightness of the film, is sensitive to ultraviolet rays, is easy to oxidize, age, has large changes in thermal shrinkage, and has poor printing performance.
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Due to its light weight, small size, fast heat conduction, short sterilization time, and better retention of the color and aroma of the contents, the retort bag gradually replaces some iron cans and glass jars. The impact of the process is large, so there is a potential risk of bag breakage.
Common retort bag making materials include PET, aluminum foil, BOPA, PE and CPP, etc. These materials have mechanical properties (tensile strength, peel strength and impact resistance, etc.), physical properties (moisture resistance, oxygen resistance and cold resistance and heat resistance. etc.) have their own advantages and disadvantages, so in production, two-layer, three-layer or multi-layer composite structures will be used according to the type and requirements of the content to obtain the best performance. The retort pouch has thin walls and good thermal conductivity, which can reach the sterilization standard in a short time, thus saving energy. In addition, the cooking bag occupies less space, is easy to carry, and has low transportation and storage costs, so it is deeply loved by enterprises and consumers.
However, in practical applications, because the many properties of its packaging materials are greatly affected by processes such as bag making and sterilization, retort bags have certain defects, of which “broken bags” is the most troublesome problem. In order to deeply analyze the reasons for the broken bags of cooking bags, we must first start with the production process. Conventional retort bags are usually used in the following production processes: raw material acceptance → processing → bagging → hot melt sealing → inspection → heat sterilization → cooling → dry packaging, in which the bag breakage phenomenon mostly occurs in heat sterilization and cooling.
1. Substrate problem:
The retort bag is heated together with the product, which determines that the surface material of the retort bag has very good stability after cooking, especially the dimensional stability after cooking and cooling. If the thermal stability of the substrate is not good, it is easy to appear After cooking, cooling and shrinking, the delamination will lead to bag breakage.
Countermeasures: Retort bags are generally made of PET, NY, AL, RCPP and other substrates with better high temperature resistance. Pay attention to the shelf life of various substrates, especially the shelf life of RCPP, because RCPP is used as the inner layer material for high temperature cooking. , plays a central role in the performance of the cooking bag. If the quality of RCPP is relatively poor or has passed the shelf life, it will be brittle and rupture to a large extent when it is compressed after cooking and cooling.
2. The influence of bag making process:
The temperature, pressure and machine speed of the heat sealing knife are the three major elements of the retort bag making process. In order to make a good sealing bag, a reasonable match of the three is required.
Countermeasures: Due to the high requirements of the use environment, the retort bag is generally required to have strong heat sealing strength. When making retort bags, special attention should be paid to the point sealing of the junction between the bottom and the bag body, because under the cooking conditions, as the material shrinks, the junction will become the focus of moisture and heat attack. The number of heat seals affects the heat seal strength to a large extent. Reasonable setting of the number of horizontal seals and vertical seals during bag making can well ensure that each edge has a good heat seal strength. At the same time, attention should be paid to the cooling after heat sealing. During cooling, under a certain pressure, use a lower temperature to shape the position just melted and heat sealed to eliminate stress concentration.
After more than 30 years of development, my country’s plastic food packaging industry has become an indispensable industry in the national economy. Although domestic and international public opinion has generally believed that plastic food packaging bags have various adverse effects on consumers’ health and the environment this year, they have continued to call for a large and extensive use of paper food packaging bags. However, the consumption of plastic food packaging materials is still increasing rapidly.
The original intention of developing plastic food packaging materials is to solve the problems of various types of food that are easily damp, moldy, and deteriorated due to no packaging or poor packaging. However, due to some reasons, consumers often smell food when they open food packaging bags. The strange smell or even odor in the packaging bag has caused many conflicts and disputes between consumers and food factories, food factories and packaging factories, and packaging factories and raw material suppliers.
1. Production packaging material stage
In the production stage of packaging materials, printing, extrusion lamination, dry lamination and other processes will lead to the generation of “peculiar smell”. The specific performance is as follows:
(1) Residual solvent problem
In the gravure printing and solvent-based dry compounding process of plastic composite materials, a large amount of organic solvents, such as toluene, ethyl acetate, butanone, etc., need to be used. According to the process requirements, these solvents should be volatilized in the production process, but in the actual production process, there will always be more or less solvents that are not completely volatilized due to various reasons, which is the so-called “residual solvent”, ” “Residual solvent” is generally a mixture of several solvents. When the content of “residual solvent” is lower than a certain value, the human sense of smell will not sense its existence, and it will not affect the taste of the packaged food. When the content of “residual solvent” is greater than a certain value, people’s sense of smell can sense its existence. When consumers open the food packaging bag with high “residual solvent”, they may smell different from the moldy food. , rotten “odor”.
(2) The problem of resin oxidation odor
Extrusion lamination is another compounding process for compounding flexible packaging materials. In this process, the granular plastic resin needs to be melted at high temperature, coated on other substrates through a die, and then cooled to form. If the temperature is too high, the plastic resin will be oxidized and decomposed, resulting in the so-called “resin oxidation odor”. If food is packaged with this material, the aroma of the food will also change. This “peculiar smell” can be produced through strict control. Process conditions are eliminated.
2. Food packaging stage
Other flavors in the production workshop will be mixed into the packaging, especially some inflatable packaged foods, such as potato chips, egg yolk pie, etc. According to normal requirements, the inflatable packaged food should be filled with bottled spring nitrogen or nitrogen and carbon dioxide. gas mixture. However, in order to reduce production costs, many enterprises charge ordinary air, and in order to reduce the impact of the noise of the air compressor on the operation work, the air compressor is generally placed far away from the packaging production line, so that other areas are inevitably placed. of other flavors of air into the food packaging. Whether it is legal to fill with air or not, it is self-evident that the oxygen in it will cause the oxidation of certain ingredients in the food.
Unsatisfactory process conditions such as temperature and time used for processing will also lead to the generation of “peculiar smell”. In order to prolong the shelf life of food, after the packaging process is completed, the packaged food should be sterilized, boiled in water below 100°C, cooked at high temperature of 121°C and 135°C, sterilized by microwave oven, radioactive radiation, etc. The above-mentioned sterilization methods all require a certain temperature or intensity for a certain period of time to achieve the predetermined sterilization effect, and the sterilization conditions need to be adjusted according to the weight and volume of the content. Generally, the common problems in the post-processing process are mainly that the high-temperature cooking equipment does not meet the requirements; not paying attention to the hygienic conditions of food processing in the early stage and blindly emphasizing the sterilization conditions in the later stage, resulting in unstable product quality.
3. Transportation and storage of packaged food
The conditions of transportation and storage are relatively poor, mechanical collisions are prone to occur between food packaging bags, and the food packaging bags are under too much pressure. High, which promotes the rapid reproduction of bacteria in the contents that have not been strictly sterilized, and the physical deterioration, which leads to the expansion of the bag; the poor selection of packaging materials, air resistance, moisture resistance, and insufficient shading, cannot effectively protect the contents, causing the contents Loss of the original fragrance, dampness, discoloration; poor packaging technology, resulting in loose sealing or damage to the sealing, resulting in the leakage of the inner gas and the outer air and the entry of external air and bacteria into the interior of the food packaging bag. Packaged foods are not sold or consumed in a timely manner, resulting in past expiration dates.
The researchers found that the so-called “peculiar smell” of packaged food has many manifestations, and the reasons for the “peculiar smell” are also various, which may lead to the occurrence of “peculiar smell” in all aspects of food production, transportation, storage, sales and consumption. Ultimately, the products produced cannot realize their value, causing waste of social resources, or causing harm to consumers’ physical and mental health.
The problem of “peculiar smell” of packaged food is not only a problem of food producers, but a problem that should be paid attention to in all relevant links of the whole society. In addition, the relevant departments strengthen the management of enterprises, and eliminate the “peculiar smell” of packaged food from the source.
Food packaging bags are a type of outer packaging design. Such bags are often used in our daily life. In order to store food more conveniently, while maintaining the freshness of food, this kind of packaging bag came into being. It can be in direct contact with food without affecting the quality of food. Let’s talk about the 6 major testing standards for food packaging bags.
1. Hygiene inspection:
Its hygiene is very important in flexible packaging, because it is in direct contact with the food we eat every day, so the primary standard for its inspection is hygiene.
Including evaporation residue (acetic acid, ethanol, n-hexane), consumption of potassium permanganate, heavy metals, decolorization test. Evaporation residues reflect the possibility of residues and heavy metals precipitated out of food packaging bags when they encounter vinegar, wine, oil and other liquids during use. Residues and heavy metals will have adverse effects on human health. In addition, residues will also directly affect the color and aroma of food. , taste and other food quality.
2. Safety inspection:
The raw materials and additives used in the bags must meet the relevant national quality requirements, and ensure that they will not cause poisoning and other harm to the human body.
3. Degradability test:
The degradation type of the product can be divided into photodegradation type, biodegradation type and environmental degradation type. If the degradation performance is good, the bag will break, differentiate and degrade by itself under the combined action of light and microorganisms, and eventually become debris, which is accepted by the natural environment and avoids white pollution.
4. Appearance inspection:
The appearance of the food packaging bag should be smooth, without scratches, burns, bubbles, oil breakage and wrinkles, and the heat sealing should be smooth and free of false sealing. The film shall not have cracks, pores and composite layer separation. No impurities, foreign objects and oil stains and other pollution.
5. Specification inspection:
Its specification, width, length and thickness deviation should all be within the specified range.
6. Physical and mechanical performance inspection:
That is, the quality of the bag is better. Physical and mechanical properties testing includes tensile strength and elongation at break. It reflects the ability of the product to stretch during use. If the product has poor stretching ability, it will be prone to rupture and damage during use.
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In daily life, whether it is a shopping mall or a home, beautifully designed and easy-to-use food packaging bags can be seen everywhere. In fact, the food packaging bag is like the personal clothing of the food. It not only protects the food, but also facilitates the storage, transportation and sale of the food. In most cases, the unique and beautiful appearance of food packaging bags is also a weapon that attracts consumers’ attention.
Presumably everyone wants to know how to customize exquisite food packaging bags? Hunan Zekun Packaging, a professional flexible packaging manufacturer, believes that no matter how you want to customize food packaging bags, you must abide by a principle, that is, you must choose a good food packaging bag manufacturer, a powerful and large-scale customized production Only manufacturers can ensure that the customized food packaging bags are more beautiful and of better quality.
The first、Six issues that need to be paid attention to in the customization of food packaging bags:
1. Customized manufacturers must be qualified formal enterprises;
2. The food packaging bags produced by the manufacturer must meet the food safety standards, and the food directly imported should use non-toxic and clean packaging materials, tableware, drinking utensils and containers.
3. The selection of food packaging bag materials should meet the following requirements: degradable or easy to recycle, in line with environmental protection requirements; in line with relevant food containers and packaging materials hygiene standards.
4. Food packaging bags shall be marked on the container and outer packaging of bulk food with the name of the food, production date or production batch number, shelf life, and the name, address, and contact information of the producer and operator.
5. Qualified food packaging must be printed with the “QS” mark when it leaves the factory for sale. Without this mark, it cannot be sold in the market.
6. Food packaging bags must have sufficient thickness and strength, so as to ensure the function of food bags.
The second、When customizing food packaging bags, you should also pay attention to the three elements of material, style and pattern：
1. Food packaging materials
What material to choose to package your food depends on the nature of your product. For example, if you want to pack moon cakes, you need to use high-barrier materials. If you want to pack oily food, you need to use oil-packed PE. There are many composite structural materials in packaging materials, which are determined according to the functional characteristics of the product. This is the most important point of customizing food packaging bags. Choosing the right ingredients can effectively extend the shelf life of food.
There are many styles of food packaging bags that can be processed, and new styles appear every day. Common food packaging bags, in terms of shape, mainly include flat pockets, side sealing bags, stand-up bags, zipper bags, fork ear bags, sling bags, waist-hole bags, vest bags, self-adhesive bags, nozzle bags, special-shaped bags etc. How to choose the style of the packaging bag has the most direct relationship with the nature of the product and the usage habits of consumers.
For your product to be distinctive and attractive, you need to design a unique set of printed patterns for your packaging. Exquisite printing patterns can attract consumers’ attention, increase the desire to buy, and also highlight your brand more. How to design beautiful patterns, which requires your design team to be strong enough.
The third、Food packaging bag customization is divided into 9 steps:
After determining the specifications, material, thickness and bag shape of the food packaging bag, let the company’s designer or professional design and production outsourcing team design the artwork according to these materials. When designing, you must give reference suggestions and finally determine the bag pattern. When designing, pay special attention to the text information on the packaging bag, such as: manufacturer name, ingredients, product introduction, origin, net weight, specifications, food label number, QS certification, health license number, production date, storage conditions, shelf life , edible method, manufacturer’s name, factory address, product barcode and contact number, etc., of which QS and barcode must not be less.
2. Plate making
After the artwork is determined, professional technicians are required to color-separate the pattern and repair some unclear areas. At the same time, more than a dozen processes are needed to complete the plate making, so I will not introduce them one by one here. Visit Shunxingyuan Packaging for inspection.
After the raw materials are prepared, use a high-speed printing machine to print the surface film. When printing, there is a plate roll for each color, and the engraving of the plate roll is intaglio engraving.
After printing, the surface film and the easily heat-sealable inner film are compounded in a high-speed peritoneal machine with special glue.
After compounding, it needs to be cured in a curing room above 45 degrees, in order to make the plastic packaging bag not easy to delaminate.
6. Bag making
After curing, the production of plastic packaging bags has come to an end. At this time, certain skills are required. The technicians must ensure that the edges of the color-printed packaging bags are well sealed and air-tight.
7. Quality inspection
The main items of plastic packaging bag inspection are size (length mm, width mm, thickness um), appearance, overprint error, color difference, peel strength, heat sealing strength, etc.
The length and width are detected by a ruler, and the thickness is detected by a thickness gauge.
The inspection of chromatic aberration is mainly through checking with the standard sealing sample, and the color difference should be consistent at one arm distance. In terms of color, Shunxingyuan Packaging will also use a 50 times magnifying glass to carefully check the color of the printed matter. Generally, the color is combined by the dots one by one. If the color is wrong, the dots will appear irregular. Distribution. Generally, the dots of Shunxingyuan packaging and printing are regular, and the dots are circular.
The inspection of the overprint error is mainly visual inspection to observe whether there is a phenomenon of printing ghosting.
Peel strength and heat seal strength are mainly tested by AGS-5KNG electronic universal testing machine. The detection principle is the same as that of the computer tension meter.
For the plastic packaging bags that have passed the quality inspection, they are packaged and put into the warehouse for unified management for later shipment.
After bagging and storage, Hunan Zekun Packaging will immediately contact the customer to arrange shipment.
Zekun Packaging Technology Co., Ltd. is professional manfacturer in flexible packaging bag .
Kraft paper bags are non-toxic, odorless and non-polluting, meet national environmental protection standards, have high strength and high environmental protection, and are currently one of the most popular environmentally friendly packaging materials in the world. Kraft paper bags made of kraft paper are more and more widely used. When shopping in supermarkets, shopping malls, shoe stores, clothing stores, etc., there are generally kraft paper bags available to facilitate customers to carry the purchased items. Kraft paper bag is an environmentally friendly packaging bag with a wide variety. Let’s take a look at the classification of kraft paper bags.
Classification of kraft paper bags:
1: According to the material can be divided into:
1) Multi-layer kraft paper bag: Use two or more layers of kraft paper for machine processing to make a bag shape, stitch the bottom with polyester thread, and then use hot air paper for heat sealing.
2), paper-plastic composite bag: also known as three-in-one kraft paper bag, the outer layer is kraft paper, the inner layer is plastic PP woven bag, using EVA, PP, PE and other raw materials for high temperature composite treatment, after completion, the bottom treatment is carried out according to different types .
3), woven bag compound kraft paper bag, usually the bag size is larger.
2: According to the bag type, it can be divided into: a. three-side sealing kraft paper bag; b. side organ kraft paper bag; c. self-supporting kraft paper bag; d. zipper kraft paper bag; e. self-supporting zipper kraft paper bag
3: According to the appearance of the bag, it can be divided into: a. valve bag; b. square bottom bag; c. seam bottom bag; d. heat sealing bag; e. heat sealing square bottom bag
The kraft paper bag is based on all wood pulp paper. The color is divided into white kraft paper and yellow kraft paper. A layer of PP material can be used to coat the paper to play a waterproof role. The strength of the bag can be made into one to six layers according to customer requirements. , printing and bag making integration. The opening and back cover methods are divided into heat sealing, paper sealing and lake bottom.
The raw materials of kraft paper bags are mainly kraft paper, PP woven cloth, polyester thread and so on.
The use of kraft paper bags: used to package powder, granular, flake, and block materials; products are widely used in chemical, building materials, food, medicine, metallurgy, plastic, feed and other industries.
Hunan Zekun Packaging focuses on innovation and research and development in the packaging industry. At present, it has made a major breakthrough in the process of kraft paper composite bags. It adopts the surface printing process of environmentally friendly ink paper bags, which saves an average of 10% of the packaging cost for our kraft paper bags. Friends in need can consult us for details.
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Since coffee beans naturally generate carbon dioxide after roasting, direct packaging can easily cause damage to the packaging, and prolonged exposure to air will cause the loss of aroma and lead to the oxidation of oil and aroma components in the coffee, resulting in a decline in quality. Therefore, the packaging of coffee beans (powder) is particularly important. Let’s take a look at how to choose coffee packaging!
The classification of coffee packaging bags can be roughly divided into three categories: green bean export packaging, roasted coffee bean (powder) packaging, and instant coffee packaging. Among these three categories, roasted coffee beans (powder) packaging is common in the market, which can be divided into 4 types of bags. type of packaging:
1. Flexible non-airtight packaging
This is the most economical one. Usually used by small local bakeries because they can guarantee quick supply. The coffee beans can be consumed in time. Coffee beans in this packaging can only be stored for a short period of time.
2. Airtight packaging
Suitable for bar, home or indirect supply (supermarket, etc.). Both sachets and cans will work, after the coffee is filled, vacuumed and sealed. Due to the formation of carbon dioxide during the roasting process, this package can only be packaged after the coffee has been left for a period of time to deaerate, so there is a storage interval of several days. Coffee beans last longer than ground coffee. Low cost since no separation from air is required during storage. Coffee in this packaging should be used up within 10 weeks.
3. One-way valve packaging
Available in pouches and cans. After roasting, the coffee is placed in a special vacuum container with a one-way valve. This valve allows gas to go out, but not in. A separate storage phase is not required, but the aroma is somewhat lost due to the outgassing process. It avoids the formation of rancid smells, but does not prevent the loss of aromas.
4. Pressurized packaging
This is the most expensive way, but keeps the coffee for up to two years. The size depends on the type of user: home or bar. After a few minutes of roasting, the coffee can be vacuum-packed. After adding some inert gas, keep the proper pressure inside the package. The coffee beans are kept under pressure, leaving the aroma on the fat, thereby improving the aroma of the beverage.
In addition to bags, there are also cans: cans are generally metal and glass, both with plastic lids for easy sealing.
The packaging of instant coffee is relatively simple. Generally, small sealed bags are used, mainly long strips, and outer packaging boxes are also provided. Of course, there are also some canned instant coffee supplies on the market.
The color of coffee packaging also has certain rules. According to the convention formed in the industry, the color of finished coffee packaging reflects the characteristics of coffee to a certain extent:
Red-packaged coffee generally has a thicker taste, which can make the drinker quickly wake up from the good dream of last night;
Black-packaged coffee belongs to high-quality small fruit coffee;
Gold-packed coffee symbolizes wealth and wealth, indicating that it is the best in coffee;
Coffee packaged in blue is generally “decaffeinated” coffee.
Food vacuum and vacuum inflatable flexible packaging technology occupies a certain position in food packaging technology, and some functions and functions cannot be easily replaced by other packaging technologies. my country’s vacuum packaging technology was developed in the early 1980s, and vacuum inflatable packaging technology began to be used in small quantities in the early 1990s. With the promotion of small packaging and the development of supermarkets, its application scope will become more and more extensive. Some will gradually replace hard packaging, and the prospects will be very promising.
The main function of vacuum packaging is to remove oxygen in order to help prevent food from spoiling. The principle is also relatively simple. Because food mildew and spoilage are mainly caused by the activities of microorganisms, most microorganisms (such as molds and yeasts) need oxygen to survive. Yes, and vacuum packaging uses this principle to extract oxygen in the packaging bag and food cells, so that microorganisms lose their “survival environment”. Experiments show that when the oxygen concentration in the packaging bag is ≤ 1%, the growth and reproduction speed of microorganisms will drop sharply, and the oxygen concentration ≤ 0.5%, most microorganisms will be inhibited and stop reproducing. (Note: Vacuum packaging cannot inhibit the growth of anaerobic bacteria and the deterioration and discoloration of food caused by enzyme reactions, so it needs to be combined with other auxiliary methods, such as refrigeration, quick freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salt Marinated etc.)
In addition to inhibiting the growth and reproduction of microorganisms, vacuum deoxygenation has another important function to prevent food oxidation. Because fats and oils contain a large amount of unsaturated fatty acids, they are oxidized under the action of oxygen, which will make the food taste and deteriorate. In addition, oxidation also causes the loss of vitamin A and vitamin C, and the unstable substances in food pigments are affected by oxygen to darken the color. Therefore, deoxygenation can effectively prevent food from spoiling and maintain its color, aroma, taste and nutritional value.
In addition to the oxygen-removing and quality-preserving functions of vacuum packaging, the main functions of vacuum inflatable packaging include compression resistance, gas barrier, and freshness preservation, which can more effectively maintain the original color, aroma, taste, shape and shape of food for a long time. Nutritional value. In addition, there are many foods that are not suitable for vacuum packaging, but must be vacuum-filled packaging. Such as crispy and fragile foods, foods that are easy to agglomerate, foods that are easy to deform and run out of oil, foods with sharp edges or corners or high hardness that will pierce the packaging bag, etc. After the food is vacuum-inflated and packaged, the inflation pressure inside the packaging bag is stronger than the atmospheric pressure outside the packaging bag, which can effectively prevent the food from being crushed and deformed under pressure, and does not affect the appearance of the packaging bag and the printing and decoration.
The vacuum inflatable package is filled with a single gas of nitrogen, carbon dioxide, oxygen or a mixed gas of 2-3 gases after being vacuumed. Among them, nitrogen is an inert gas, which plays a filling role and keeps positive pressure inside the bag to prevent air outside the bag from entering the bag and protect the food. Carbon oxide gas can be dissolved in various fats or water to form weakly acidic carbonic acid, which has the activity of inhibiting molds, spoilage bacteria and other microorganisms. Oxygen can inhibit the growth and reproduction of anaerobic bacteria, and maintain the freshness and color of fruits and vegetables. High concentration of oxygen can keep fresh meats bright red.
Tea, nuts, melon seeds, meat floss, etc.; fried potato chips, puffed food, fruit and vegetable chips, etc.; cakes, moon cakes, etc.; various powders, food additives; various native products, precious Chinese medicinal materials; various dehydrated vegetables .
In addition, there are many foods that are not suitable for vacuum packaging and must be vacuum-filled packaging. Such as crunchy and fragile foods, foods that are easy to agglomerate, foods that are easy to deform and run out of oil, foods with sharp edges or corners or high hardness that will pierce the packaging bag, etc.
What is gravure printing for composite packaging bags?
The gravure printing industry is referred to as gravure printing. Gravure printing is one of the four major printing methods. It is named after the printing plate, that is, all printed patterns and characters are recessed on the printing plate. The printing must be done first. Roll the ink on the plate surface, the ink will naturally fall into the printed part of the depression, and then wipe the ink adhered to the surface (of course the ink of the depression will not be wiped off). After placing the paper, use greater pressure to emboss the recessed printing ink on the paper. Those who use this printing method are called “gravure printing.”
Gravure printing is divided into engraved gravure and photo gravure:
1. Engraving intaglio:
Engraving intaglio is an early evolution from metal decoration carving. At that time, the carved copper pattern was used as an ornament, and then it was used for printing performance.
The copperplate printing paper used in engraving gravure was first moistened in the early stage, mainly to increase the adhesion of the ink to the ink. Therefore, the back of the paper needs to be padded with a thick cloth, and a greater pressure can be used to dent the printed pattern. The adhered ink is drawn and printed on the paper. The main disadvantage of this printing method is that it needs to be dried after printing, which will produce irregular expansion and contraction, which will cause the length of the printed product to be uneven. But now copperplate printing has been improved to a dry printing method, which has improved the layout and made the lines of the engraved depressions shallower. Make it easy to pull out the sticky ink. According to copperplate printing and steel plate printing, the thickness and depth of the pattern are used to express the three-dimensional effect. The thick and deep printing plate has thicker ink, so the ink color is relatively thick. deep. A printing plate with thin and light lines will hold thinner ink, so the ink printed on it will be lighter. This kind of printed matter is as beautiful as the design of modern visual art, but most of them are used to express patterns or text. As for continuous-tone like photos, it is more difficult to achieve.
Photogravure is also called photocopy, that is, the copper plate is corroded by the principle of photography. It is a kind of adhesive paper (LarboTissue) that has been sensitized by potassium dichromate solution and a special screen for gravure. Then the adhesive tape and the positive film of continuous plate adjustment are exposed. After the adhesive tape is exposed for two times, it can be developed by warm water. The adhesive tape in the light part of the picture has a lighter black and silver on the positive film, so the adhesive tape The degree of hardening by the light wave is higher, so the film after water development is thicker. The adhesive paper in the dark part of the screen can be light wave due to the thick black and silver mask of the positive film. The degree of hardening by transmission is less, so the film after water development is thinner. Therefore, after the development, the adhesive tape of different thickness is attached to the copper roller or flat roller, and it is corroded by ferric chloride. The thicker part of the light part of the adhesive film, the solution can penetrate and erode the copper plate to a greater depth. It is shallow, so the ink film that it adheres to is thinner, and the ink color that it prints is lighter. As for the dark area, where the film is thin, the thickness of the glue can be penetrated by the solution and etched into the copper plate must be deeper, so the print is sticky The ink film is thicker, and the ink color it prints is darker.
What are the characteristics of gravure printing on plastic packaging bags?
1. The amount of inking of Louyin is determined by the depth of the concave of the graphic part of the curved printing plate. The concave depth of the graphic part during printing is relatively fixed. Therefore, the amount of ink is kept relatively stable;
2. The inking method of gravure printing is that the plate cylinder is directly immersed in the ink tank to receive the ink, or the ink transfer roller is used to coat the ink on the plate cylinder, eliminating many ink transfer rollers and ink volume adjustment devices;
3. The ink transfer volume of gravure printing is larger than that of offset printing and flexographic printing, so the ink layer of the product graphics and text is thick, and the three-dimensional effect is strong;
4. Most gravure printing is rotary printing, with fast speed and strong ability;
5. The range of gravure printing materials is wide, and it has good adaptability to plastic packaging bags and composite materials that are easy to extend and deform;
6. Gravure printing uses dry ink and non-absorbent plastic packaging film.
Disadvantages of gravure printing: plate-making costs are expensive, printing costs are also expensive, plate-making work is more complicated, and a small number of prints is not suitable.
In modern society, the packaging industry has firmly established itself as the second largest consumer industry chair, second only to the clothing industry. In our lives, packaging bags can also be seen everywhere. So, do you know the most commonly used packaging? Do you know what technologies are used? What is the classification of packaging technology? Today, the editor of Zekun will answer you one by one.
In terms of functionality, our packaging technology can be divided into:
1. Moisture-proof packaging
Moisture-proof packaging is to prevent external moisture from affecting the goods, and use materials with water vapor resistance to package the goods;
2. Waterproof packaging
The obvious meaning of waterproof packaging is waterproof, to prevent the deterioration of goods due to water, etc.;
3. Dust-proof packaging
Dust-proof packaging is usually sealed to prevent dust from entering the packaging container and affecting the quality of the product;
4. Anti-mold packaging
Anti-mold packaging can prevent mildew and spoilage of organic products, such as preventing food from becoming moldy;
5. Insect-proof packaging
Insect-proof packaging is a packaging method in which pesticides are added to packaging materials or packaging containers to protect the contents from pests;
6. Anti-vibration packaging
Anti-vibration packaging, also known as cushioning packaging, refers to packaging that takes certain protective measures to reduce the impact and vibration of the content and protect it from damage;
7. Anti-theft packaging
Anti-theft packaging is a packaging designed to prevent the content from being stolen, and it will leave irreparable traces after unsealing;
8. Vacuum packaging
Vacuum packaging is an airtight packaging method in which a vacuum is drawn before sealing and a vacuum is reached after sealing;
9. Inflatable packaging
Inflatable packaging is a packaging in which carbon dioxide and nitrogen are flushed into a sealed packaging container;
10. Breathable packaging
Breathable packaging is a packaging that allows air to enter and exit;
11. Skin packaging
Skin packaging is to place items on a bottom plate made of cardboard or plastic film, which is breathable A packaging method on the bottom plate;
12. Blister packaging
Blister packaging is a packaging method in which items are sealed between a blister formed of transparent plastic sheets and a bottom plate made of composite materials;
13. Aseptic packaging
Aseptic packaging is the aseptic processing of packaging materials and containers in contact with items, and the packaging of items in a sterile environment;
14. Frozen packaging
Frozen packaging is a packaging method that prevents the frozen contents from being lost during the freezing, transportation, and storage processes, and does not dry and taste;
15. Fresh-keeping packaging
Fresh-keeping packaging is a packaging method that enables fresh fruits and vegetables to maintain the original product color, aroma and taste under certain time and conditions;
Thermal insulation packaging is a packaging that takes certain protective measures to reduce the heat exchange between the packaged items and the external environment during storage and transportation.
17. Shrink packaging
Shrink packaging is a packaging technology method in which items (or inner packaging) are wrapped with shrink film, and then the film is appropriately heated to shrink the film and close to the item (or inner packaging). Shrink film is a polyethylene film that has undergone special stretching and cooling treatments. Because the film generates residual shrinkage stress during directional stretching, this stress will be eliminated after a certain amount of heat, so that it will shrink sharply in both the horizontal and vertical directions. At the same time, the thickness of the film is increased. The shrinkage rate is usually 30 to 70%. The shrinkage force reaches the maximum during the cooling stage and can be maintained for a long time.
18. Stretch packaging
Stretch packaging is a new packaging technology adopted in the 1970s. It is developed from shrink packaging. Stretch packaging relies on mechanical devices to stretch and tightly wrap an elastic film around the packaged item at room temperature. A packaging method that seals at the end. Since stretch packaging does not require heating, the energy consumed is only one twentieth of shrink packaging. Stretch packaging can be used to pack a single item, or it can be used for collective packaging such as pallet packaging.
Summarize the classification of packaging
1. According to the product operation mode: domestic product packaging, export product packaging, special product packaging;
2. According to the role of packaging in the circulation process, there are single-piece packaging, middle packaging and outer packaging, etc.;
3. Classified by packaging product materials: paper product packaging, plastic product packaging, metal packaging, bamboo and wood packaging, glass container packaging and composite packaging, etc.;
4. According to the number of times the packaging is used: one-time packaging, multiple-use packaging and turnover packaging, etc.;
5. According to the degree of softness and hardness of the packaging container: hard packaging, semi-rigid packaging and flexible packaging, etc.;
6. Divided by product types: food packaging, pharmaceutical packaging, mechanical and electrical product design packaging, dangerous goods packaging, etc.;
7. According to function: there are transportation packaging, storage packaging and sales packaging, etc.;
8. According to packaging technology methods: shock-proof packaging, moisture-proof packaging, rust-proof packaging, mildew-proof packaging, etc.
The development of packaging bags has gone through four obvious stages: the original packaging bag stage, the large packaging bag stage, and the small packaging bag stage. At present, it has gradually entered a new stage of environmentally friendly (green) packaging bags. With the development of the commodity economy, the commercial nature of the packaging itself has become more and more significant. It has become a special product that is no longer dependent on the production of commodities, a widely used product that all commodities cannot do without. Especially flexible packaging plays an increasingly important role in many fields. Compared with other packaging methods, flexible packaging has more advantages. Flexible packaging has the characteristics of barrier properties, easy printing, low cost, light weight, impact resistance, transparency, microwave heating, aspect and packaging design options, and it is safe and hygienic. , Convenient, so popular with consumers. With the increasing demand for flexible packaging and the deepening of people’s awareness of energy-saving, environmentally friendly and green packaging, the flexible packaging industry has gained tremendous market momentum, which has promoted the stable and sustainable development of flexible packaging materials and flexible packaging equipment, thereby providing a huge opportunity for the development of the entire flexible packaging industry. Opportunity.
Paper, plastic, glass, and metal are the four pillars of the modern packaging industry. Among them, paper and plastic are the most widely used, and their usage is also growing fastest. In the following areas, plastic flexible packaging plays an increasingly important role.
(1) Food packaging bag:
When food is placed in the air, various changes (such as spoilage, rancidity, discoloration, drying or moisture absorption, etc.) will occur, resulting in untrustworthy. In addition to its own reasons, food spoilage has a lot to do with its environmental conditions. These environmental conditions mainly include oxygen, temperature, PH value and so on. Therefore, the primary function of composite flexible packaging for food is to reduce the adverse effects of environmental factors on food and prevent food from spoiling too quickly. The application forms of flexible food packaging materials include vacuum packaging, modified atmosphere packaging, moisture-proof packaging, aseptic packaging and heat shrink packaging, such as instant noodles, milk powder, tea, snack foods, snack foods, etc., beverages, candy, retort bags, pickles System of vegetables and meat products, frozen fish and shrimps, condiments, etc.
(2) Packaging bags for cosmetics and detergents:
Due to its gorgeous appearance, rich functions, and diverse expressiveness, flexible packaging has become one of the most important packaging forms for daily chemical products, such as shampoos, moisturizers, and washing powders.
(3) Medicine packaging bag:
Medicine is a commercial value-added product, which has high requirements for safety and reliability. Therefore, the medical flexible packaging must take into account the protection function of the medicine and the convenience of carrying and using at the same time. According to materials, common medical flexible packaging materials include composite films and bags for pharmaceutical packaging, aluminum foil for pharmaceutical packaging (PTP aluminum foil), polyvinyl (PVC) or non-PVC multi-layer co-extruded infusion film and bags, and aluminum-plastic sealing pads. Tablets, paper and composite paper bags, etc., such as aluminum foil blister, Chinese medicine tablets, capsules, pills, powders, etc.
(4) Seed packaging bags: various crop seeds, vegetables, flower seeds, etc.
(5) Industrial product packaging bags: such as clothing, knitted underwear, women’s and children’s products packaging and New Year pictures, wall calendars, posters, etc.
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.
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.
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.
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.
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.