Nut packaging bags are generally composed of multi-layer materials, which are mainly divided into; vacuum packaging bags, tea packaging bags inner material: PE (Chinese name polyethylene) polyethylene is odorless, non-toxic, feels like wax, and has excellent Excellent low temperature resistance (minimum operating temperature can reach -100~-70°C), can resist most acid and alkali erosion (not resistant to acids with oxidizing properties), has good chemical stability at room temperature, and has a certain resistance to Acid-base and insoluble in any solvent. It can directly contact food, and is often used as a heat-sealing layer material for food packaging bags. Intermediate layer material: PET (Chinese name polyester) polyester is characterized by high temperature resistance, good printing, easy processing, good voltage resistance and insulation, high transparency, smooth film surface, excellent mechanical properties, high rigidity, hardness and toughness, It has good puncture resistance, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention. It is one of the commonly used barrier composite film substrates. Because the water permeability of PE film is relatively poor, PET film with good air tightness is often used to compound it to increase gas barrier properties. The requirements of the outer layer material are not so high compared to the inner layer material, which mainly meet the following characteristics, which are beneficial to bag making, printing, compounding, and the chemical properties are relatively stable. The materials of the outer layer are: BOPP (Chinese name biaxially oriented polypropylene film) features high transparency and gloss, excellent ink and coating adhesion, heat sealing strength, water vapor and grease barrier properties, UV barrier properties, pearls Glossy high-grade appearance, high barrier and low static performance. BOPP is a matte effect, similar to the frosted effect that people often say, and there is a bright effect (YOPP). Kraft paper has high hardness and good texture, and the packaging bag is three-dimensional, which is conducive to product promotion and sales, but the cost is relatively high. high. AL (aluminum foil) is characterized by soft texture, good ductility, silver-white luster, moisture-proof, air-tight, shading, abrasion-resistant, fragrance-preserving, and non-toxic and tasteless! The materials of nut packaging bags are generally determined according to the functional use. For example, in order to seal against moisture and keep freshness and fragrance, composite bags materials such as PE, PET, VMPET, and AL need to be selected. Of course, the price of different materials is different. I want to know the more cost-effective material matching of nut packaging bags! You can call our customer service directly.
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