Composite bags
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By two or more different properties of plastic film (or with aluminum foil, paper, etc.) by dry composite, extrusion composite, co-extrusion composite process together made of packaging bags. It is not a single material, but a combination of multiple materials.
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Product features (the core advantage lies in the combination and improvement of performance brought about by "compounding"):
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Comprehensive superior performance:this is the biggest characteristic of composite bag.by combining the advantages of different materials, overcome the shortcomings of a single material, to achieve:
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High Barrier:can also provide excellent moisture, oxygen, light, fragrance, odor and other properties (such as aluminum foil, aluminum film, EVOH, PVDC, PA structure). This is essential to extend the shelf life of food.
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Excellent physical and mechanical properties:can have both strength, toughness, puncture resistance, wear resistance, stiffness, etc. (such as PET/PE, BOPP/CPP).
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Good heat sealing performance:usually use the inner layer of easy heat sealing material (such as PE, CPP).
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Exquisite printing effect:outer layer usually uses materials with high printability (such as BOPP, PET, PA) to achieve exquisite patterns.
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High and low temperature resistance:can adapt to high temperature cooking (121°C, 135°C), boiling (100°C) or freezing (-18°C) and other harsh conditions.
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Anti-counterfeiting, decorative:can be combined with laser holography, special printing and other processes.
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Functionality:can be designed into self-standing bags, zipper bags, suction nozzle bags, eight-sided bags, special-shaped bags and other forms to meet different packaging needs.
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Disadvantages:
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Costs:There are many kinds of materials, the production process is complicated, and the cost is usually higher than that of single-layer OPP or PE bags.
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Recovery is relatively difficult:multiple layers of different materials are combined together, it is difficult to separate and recycle (but with the development of technology, recyclable design structures are emerging).
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Complex production process:High requirements for equipment and process control.
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Practical application scenarios (mainly used for products with high packaging performance requirements):
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Food packaging (core areas):
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High barrier requirements:coffee, tea, milk powder, nuts, potato chips, pet food, meat products, sauces, condiments, edible oil (upright bag), liquid beverage (self-supporting suction nozzle bag).
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High temperature sterilization:high temperature cooking bags, boiled bags (for cooked food, dishes, soup, etc.).
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Frozen food:frozen dumplings, dumplings, seafood, ice cream, etc.
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Daily chemical supplies:shampoo, shower gel, laundry detergent, hand sanitizerstand-up bag(replace some bottles), high-end cosmetics, skin care products packaging.
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Medical and health products:pharmaceutical blister packaging bags, granules, powder bags, drugs and health products that require high barrier and light protection.
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Industrial products:the packaging of electronic components, precision instruments and chemical products (such as pesticides and fertilizers) with high requirements for moisture-proof and oxidation-proof.
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Pet food:used.
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High end snacks, gift packaging:need beautiful appearance and good preservation of products.
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