Packing bag is the most commonly used container in our daily life, and all kinds of packing bags are also full of flowers. Then we can't just look at the appearance of the bags. Today, the professional flexible packaging manufacturing Dongguan Beite packaging comes to the packaging technology requirements of food packaging bags and the commonly used formula of food packaging bags, providing valuable reference for you in the process of customizing food packaging bags.
1、 Requirements of food packaging bags for packaging film
1. The packaging film should conform to the national standard, not inferior
Food enterprises should first find out what materials their food packaging bags need, and then find regular and professional packaging enterprises for customized processing. Because some food enterprises lack the professional knowledge of packaging materials or simply pursue low price, they will be fooled from time to time. Take food composite bags as an example. Many food enterprises use vacuum packaging. The material of this kind of food packaging bags should have at least one layer of nylon packaging. However, there are some composite bags in the market, which do not have nylon materials, but use polyester plastics (PET), because nylon materials are twice as expensive as pet. The result is that the food packaging bag is very brittle, not soft, weak puncture resistance, resulting in air leakage, broken bags and other situations, the economic loss and negative impact brought to food enterprises are far higher than the cost saved by low-cost shopping bags.
Another example is the seven layer coextrusion bags of new packaging materials, which should have at least two layers of nylon. However, there are many bags in the market that use one layer, and the nylon content is low. Some of them also use smuggled garbage, so there are more problems. This kind of bag has poor barrier property, easy to break and not resistant to high and low temperature. At present, aluminum coated bags are used as aluminum foil bags to sell to food enterprises in the market, which also needs to be identified in time to prevent being cheated.
2. Food packaging bags should meet the requirements of food safety and quality
Food enterprises should require packaging bag manufacturers to use packaging films that meet the national standards. For example, the production materials of composite bags should be green and environmentally friendly, and dry composite plastic packaging bags containing harmful substances such as benzene should not be used to avoid contamination of food due to solvent penetration.
Food packaging bag should be flat, no scratch, scald, bubble and wrinkle, no false seal. Smoothness is not only the requirement of beauty, but also related to the quality of food. If the seal of the bag is not smooth, the food packaging used for high-temperature cooking or low-temperature freezing is easy to crack.
Food packaging bags should use green materials when printing. QS standard requires that food packaging bags should not detect benzene solvents harmful to human health. However, the price of benzene solvents is about 30% lower than that of environment-friendly benzene free and keto free solvents, and the brightness and color fastness are better. Therefore, many packaging bags are still using this kind of materials in printing, which often leads to the problem of food contamination.

The production environment of the packaging enterprises making food bags should meet the standards, so as to avoid polluting the food bags in the process of making bags.

3. Dongguan Beite packaging is tailored for food enterprises
Dongguan Beite packaging has been engaged in the packaging industry for 19 years, focusing on talents. Since its establishment, the company has been taking "mutual cooperation, mutual benefit and common development" as the purpose, constantly refining, refining and strengthening, and leading the soft packaging industry. Dongguan Beite packaging service customers all over the world in many countries, Adidas, AAPE, izzue, I.T, Calvin Klein and other famous brands are in-depth cooperation.
At the same time, Dongguan Beite packaging has four unique advantages:
Reasonable quotation: Dongguan Beite packaging can give customers the most comprehensive and reasonable quotation according to different materials and different processes.
Exquisite printing: Dongguan Beite packaging adheres to the fine style, has a large number of professional masters engaged in color matching printing for more than 20 years, and has professional quality inspection personnel to check the quality problems of the printing surface, so as to make every detail of the packaging bag perfect.
High efficiency: Dongguan Beite packaging is good at coordinating the supply chain, and has a complete process from order access to finished product delivery, which truly realizes the efficient state from raw material supply to finished product delivery, saving a lot of time cost for customers.
Service in place: Dongguan Beite packaging is good at capturing the needs of customers, in line with the principle of saving worry for customers to the greatest extent, it saves cost as much as possible in material selection, controls every production link, and only improves product satisfaction from 99% to 100%.
2、 Formula of PP food bag
1. Peelable cover film
1 layer: 8um-12um stripping layer (PP, MI = 6.5)
2 layers: 40um PP barrier layer
3 layers: tack coat
4 layers: substrate (such as OPET, OPA, BOPP and aluminum foil, etc.)
2. Food composite packaging bag
One layer: 40um composite film thickness distribution: 3 / 4 / 3
Outer layer: 50% LLDPE + 25% LDPE + 25% mLLDPE + PPA
Middle layer: 72% PP + 25% mLLDPE + 3% PPA
Inner layer: 74% mLLDPE + 20% LDPE + 6% PPA
2 layers: 15um PE extrusion coating
3 layers: 20um base material (BOPP)
3. Co extrusion cooking vertical bag
Outer layer: 60% PP (MI = 3), 40% PP (MI = 1.5)
Middle layer: PP (MI = 3)
Inner layer: 60% PP (MI = 3), 40% PP (MI = 1.5)
(PP, MI = 1.5 for improving heat sealing and transparency)
4. Bread bag
Outer layer: PP (MI = 1.5) + mLLDPE
Middle layer: PP (MI = 3) + mLLDPE
MDPE (llpp) + 1
5. Tissue window
mLLDPE + PP，MI=1.5（>30%）
6. Co extrusion of food packaging bags
Outer layer: PP (MI = 3) + mLLDPE
Middle layer: PP (MI = 1.5) + mLLDPE
Inner layer: PP (MI = 3) + mLLDPE
7. Contraction membrane
Outer layer: PP (MI = 1.5)
Middle layer: LDPE + mLLDPE (> 15%)
Inner layer: PP (MI = 1.5)
8. Tissue wrapping film
Outer layer: mLLDPE
Middle layer: PP (MI = 3)
Inner layer: mLLDPE
9. Packaging of meat products
7-layer structure: mLLDPE / tie / PA / EVOH / PA / tie / PP
Five layer structure: HDPE / tie / EVOH / tie / PP
10. Self exhaust microwave oven food bag
1 layer: 65um, composite: 1 / 2 / 1
Outer layer: LLDPE + LDPE
Middle layer: 50% PP, MI = 1.5 + 35% mLLDPE + LLDPE + 15% white female
Inner layer: PP, MI = 6.5
2 layers: tack coat
3 layers: 12-15um substrate (PET or PA)
When heating food, the food bag uses gas expansion to exhaust itself, which is simple and convenient.