The material of the nut packaging bag is usually determined according to the function and purpose of its packaging. For example, for sealing against moisture, preservation and fragrance properties require the use of composite materials such as PE, PET, VMPET and AL. Of course, the price of different materials is also different. Next, yltpacking will tell you about the more cost-effective material matching of nut packaging bags! Nut packaging bags are generally made of multi-layer materials, which are mainly divided into: inner layer materials, middle layer materials, and outer layer materials. Inner layer material: PE (polyethylene) is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the lowest operating temperature can reach -100~-70°C), and can resist most acid and alkali erosion (not acid resistant) Oxidation properties, good chemical stability at room temperature, certain acid and alkali resistance, insoluble in any solvent, can be in direct contact with food, often used as heat-sealing layer material for food packaging bags. Middle layer material: PET (polyester) has high temperature resistance, good printability, easy processing, good voltage insulation, high transparency, smooth surface, excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance and wear resistance Features. Friction resistance, high and low temperature resistance, good chemical resistance, oil resistance, air tightness and fragrance retention are 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 the gas barrier property. The requirements for the outer layer material are not as high as those of the inner layer material, and mainly meet the following characteristics, which are beneficial to bag making, printing, compounding and relatively stable chemical properties. The outer layer material is: BOPP (biaxially oriented polypropylene film) with high transparency and gloss, excellent ink and coating adhesion, heat seal strength, water vapor and grease barrier properties, UV barrier properties, pearl luster high-end appearance, high Barrier and low static properties. BOPP is a matte effect, similar to the matte effect that people often say, and the other is a bright effect (YOPP). AL (aluminum foil) is soft in texture, good in ductility, silvery white, moisture-proof, air-tight, shading, wear-resistant, fragrant, non-toxic and tasteless! The above is the whole content of “more cost-effective material matching for making nut packaging bags”.
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