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What are the characteristics of multi-layer vacuum inner bags
source：sxhwkd.com | Release time：2025-12-23
The multi-layer vacuum inner bag combined with multi-layer composite structure and vacuum sealing technology has protection and preservation performance that cannot be compared to ordinary single-layer packaging bags. The core features are as follows:
1. Strong barrier properties
Multilayer structures are usually paired with high barrier materials such as PA nylon, EVOH ethylene vinyl alcohol copolymer, aluminum foil, etc., which can effectively isolate oxygen, water vapor, light, and odors. It can prevent the contents from oxidizing, deteriorating, getting damp, and clumping, especially suitable for packaging products that are sensitive to storage environments such as oils, powders, and fresh produce.
2. Puncture resistance and high strength
The mechanical properties of multi-layer composite films are superior to single-layer films. The outer layer is mostly made of wear-resistant and puncture resistant materials (such as PET polyester), and the inner layer is made of materials with good heat sealing properties (such as PE polyethylene). The overall tensile and tear resistance is strong, and it can withstand the contraction pressure during vacuum pumping, as well as friction and collision during transportation and stacking, avoiding damage and leakage of packaging bags.
3. High stability of vacuum sealing
The multi-layer structure of the heat sealing layer has stronger sealing performance, making it less prone to air leakage and bulging after vacuum sealing. It can maintain the vacuum environment inside the bag for a long time, greatly extending the shelf life of the product. Compared to single-layer vacuum bags, it is more suitable for long-term storage of food, electronic components, precision parts, etc.
4. Adapt to diverse packaging needs
Composite layers and material combinations can be customized based on the characteristics of the content, such as:
Food grade multi-layer vacuum inner bag: made of food contact grade materials, non-toxic and odorless, can directly package cooked food, dry goods, and fresh produce;
Anti static multi-layer vacuum inner bag: equipped with anti-static coating, used for packaging electronic chips, circuit boards and other products that are easily damaged by static electricity;
Light resistant multi-layer vacuum inner bag: added with aluminum foil layer or light shielding film, suitable for packaging drugs, health products, and chemical raw materials that are sensitive to light.
5. Good printing and molding performance
The outer layer material of the multi-layer structure has a smooth surface, suitable for printing product information, corporate logos, etc., with clear and firm patterns; At the same time, it can be thermoformed into various shapes such as three-dimensional bags, organ bags, etc., to meet the packaging requirements of different products, improve packaging aesthetics and practicality.
1. Strong barrier properties
Multilayer structures are usually paired with high barrier materials such as PA nylon, EVOH ethylene vinyl alcohol copolymer, aluminum foil, etc., which can effectively isolate oxygen, water vapor, light, and odors. It can prevent the contents from oxidizing, deteriorating, getting damp, and clumping, especially suitable for packaging products that are sensitive to storage environments such as oils, powders, and fresh produce.
2. Puncture resistance and high strength
The mechanical properties of multi-layer composite films are superior to single-layer films. The outer layer is mostly made of wear-resistant and puncture resistant materials (such as PET polyester), and the inner layer is made of materials with good heat sealing properties (such as PE polyethylene). The overall tensile and tear resistance is strong, and it can withstand the contraction pressure during vacuum pumping, as well as friction and collision during transportation and stacking, avoiding damage and leakage of packaging bags.
3. High stability of vacuum sealing
The multi-layer structure of the heat sealing layer has stronger sealing performance, making it less prone to air leakage and bulging after vacuum sealing. It can maintain the vacuum environment inside the bag for a long time, greatly extending the shelf life of the product. Compared to single-layer vacuum bags, it is more suitable for long-term storage of food, electronic components, precision parts, etc.
4. Adapt to diverse packaging needs
Composite layers and material combinations can be customized based on the characteristics of the content, such as:
Food grade multi-layer vacuum inner bag: made of food contact grade materials, non-toxic and odorless, can directly package cooked food, dry goods, and fresh produce;
Anti static multi-layer vacuum inner bag: equipped with anti-static coating, used for packaging electronic chips, circuit boards and other products that are easily damaged by static electricity;
Light resistant multi-layer vacuum inner bag: added with aluminum foil layer or light shielding film, suitable for packaging drugs, health products, and chemical raw materials that are sensitive to light.
5. Good printing and molding performance
The outer layer material of the multi-layer structure has a smooth surface, suitable for printing product information, corporate logos, etc., with clear and firm patterns; At the same time, it can be thermoformed into various shapes such as three-dimensional bags, organ bags, etc., to meet the packaging requirements of different products, improve packaging aesthetics and practicality.
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