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Choose a packaging material with appropriate protection
release time：2019-03-13
Browse times：3748
Modern food packaging materials mainly include plastics, papers, composite materials (plastic/plastic, plastic/paper, plastic/aluminum, foil/paper/plastic, etc.), glass bottles, metal cans. Wait. We mainly describe composite materials and plastic packaging.
1, composite materials
Composite materials are the most widely used and widely used flexible packaging materials. There are currently more than 30 types of plastics used in food packaging, and there are hundreds of multi-layer composites containing plastics. Composite materials generally use 2-6 layers, but special needs can reach 10 or even more layers. The use of plastic, paper or tissue machine, aluminum foil and other substrates, scientific and rational composite or laminate compatibility, can almost meet the requirements of a variety of different food packaging. For example, Tetra Pak milk made from multiple layers of plastic/cardboard/aluminum plastic/plastic can last up to six months to a year. Some high-resistance flexible packaged meat cans have a shelf life of up to 3 years. In some developed countries, the shelf life of composite packaging cakes can reach more than one year. After one year, the nutrition, color, aroma, taste, shape and microbial content of the cake still meet. Claim. Design composite packaging should pay special attention to the selection of each layer of substrate, the combination must be scientific and reasonable, the comprehensive performance of each layer must meet the comprehensive requirements of food packaging.
2, plastic
There are also fifteen or six kinds of plastics used in food packaging in China, such as PE, PP, PS, PET, PA, PVDC, EVA, PVA, EVOH, PVC, ionomer resin and so on. Among them, PVA, EVOH, PVDC, PET, PA, etc., high-resistance moisture, PVDC, PP, PE, etc.; radiation-resistant such as PS aromatic nylon; low temperature resistance such as PE, EVA, POET, PA, etc.; good oil resistance and mechanical properties such as ionomer resin, PA, PET, etc., ie high temperature sterilization and low temperature resistance, such as PET, PA and so on. The plastics of various plastics have different molecular structures, different degrees of polymerization, different types and amounts of additives, and different properties, even if the properties of the same plastics are different. Therefore, the choice of suitable plastic or plastic and other materials must be selected according to the requirements. Improper selection may result in degraded food quality or even loss of food value.
1, composite materials
Composite materials are the most widely used and widely used flexible packaging materials. There are currently more than 30 types of plastics used in food packaging, and there are hundreds of multi-layer composites containing plastics. Composite materials generally use 2-6 layers, but special needs can reach 10 or even more layers. The use of plastic, paper or tissue machine, aluminum foil and other substrates, scientific and rational composite or laminate compatibility, can almost meet the requirements of a variety of different food packaging. For example, Tetra Pak milk made from multiple layers of plastic/cardboard/aluminum plastic/plastic can last up to six months to a year. Some high-resistance flexible packaged meat cans have a shelf life of up to 3 years. In some developed countries, the shelf life of composite packaging cakes can reach more than one year. After one year, the nutrition, color, aroma, taste, shape and microbial content of the cake still meet. Claim. Design composite packaging should pay special attention to the selection of each layer of substrate, the combination must be scientific and reasonable, the comprehensive performance of each layer must meet the comprehensive requirements of food packaging.
2, plastic
There are also fifteen or six kinds of plastics used in food packaging in China, such as PE, PP, PS, PET, PA, PVDC, EVA, PVA, EVOH, PVC, ionomer resin and so on. Among them, PVA, EVOH, PVDC, PET, PA, etc., high-resistance moisture, PVDC, PP, PE, etc.; radiation-resistant such as PS aromatic nylon; low temperature resistance such as PE, EVA, POET, PA, etc.; good oil resistance and mechanical properties such as ionomer resin, PA, PET, etc., ie high temperature sterilization and low temperature resistance, such as PET, PA and so on. The plastics of various plastics have different molecular structures, different degrees of polymerization, different types and amounts of additives, and different properties, even if the properties of the same plastics are different. Therefore, the choice of suitable plastic or plastic and other materials must be selected according to the requirements. Improper selection may result in degraded food quality or even loss of food value.