Hunan Zekun Packaging Bag You know several common coffee packaging bags

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.

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

Analyze the role and application of vacuum packaging and vacuum inflatable packaging

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.

Application range of vacuum packaging:

Cured products: sausages, ham, bacon, duck, etc.; pickles: mustard, dried radish, kohlrabi, kimchi, etc.; soy products: dried tofu, vegetarian chicken, bean paste, etc.; cooked food products: roast chicken, roast duck, sauce beef, etc. Convenience food: rice, instant noodles, cooked vegetables, etc.; soft canned food: bamboo shoots in water, fruits in syrup, eight-treasure porridge, etc.

Application range of vacuum inflatable packaging:

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.

Zekun Packaging analyzes the gravure printing and characteristics of composite packaging bags

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.

2. Photogravure

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.

Summary and classification of commonly used packaging technologies

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;

16.Insulation packaging

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.

We will share the above 18 packaging technologies here. If you want to know more about packaging knowledge, please pay attention to Hunan Zekun Packaging Technology Co., Ltd.: https://www.zekunpackaging.net/ or https://www.zekunpackaging.com/

Ze Kun talks about the application of flexible packaging

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.

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/