The compound packaging bag is to combine various materials with different characteristics to improve the breathability, moisture permeability, oil resistance, water resistance, and chemical resistance of the packaging material, so that it can play the role of insect, dust, microbe, and light. It has better mechanical strength and processing applicability, as well as good heat resistance, cold resistance and impact resistance, and good printing and decoration effects.
　　
Classified according to the packaging form: three-side seal, yin-yang bag, middle seal, pillow bag, five-side seal bag, self-supporting bag, zipper bag, straw bag, roll material, cover material, etc.
　　
Classification by function: high-yin membrane bag, cooking film bag, antistatic film bag, antibacterial film bag, anti-fog film bag, vacuum bag, chemical film bag, deaeration packaging film bag, modified atmosphere packaging film bag, etc.
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In order to meet the required packaging requirements, the composite packaging film needs to have the following six properties:
1. Mechanical properties
Tensile strength, rigidity, wear resistance, sealing, elongation, friction, etc. meet the requirements.
2. Physical and chemical properties
It can meet the requirements of moisture and oxygen barrier, fragrance retention, oil resistance, chemical resistance and light protection.
3. Durability
The performance under low temperature and high temperature, the stability performance and degradability under high temperature conditions meet the requirements.
4. Workability
Suitable for printing, convenient for automatic packaging, anti-static, heat shrinkability, etc. meet the requirements.
5. Hygienic performance
When used for food packaging, it should be non-toxic and tasteless, and the ingredients contained in it should not migrate to food.
6. Commodity display
Transparency, whiteness, gloss, ease of opening, and easy handling of waste meet the requirements.
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