1. Composite material composite material is a flexible packaging material with many types and applications. 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.
2. Plastics 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, and ionomer resin. 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.
3, paper and cardboard modern packaging mainly uses a variety of processing potato (cardboard), composite paper, laminated paper (cardboard), etc., such as polymer processing paper, wax processing paper, oil processing paper, cellophane, parchment, plating Aluminum paper, paper/aluminum foil laminated paper, etc. In transport packaging, corrugated paperboard is used in a large amount, corrugated cardboard boxes, and almost all of the pallets replace wooden boxes. Honeycomb cartons are * new high-strength cardboard containers. In addition, it should be noted that aluminized paper, aluminized plastic and paper/aluminum foil laminates, plastic/aluminum foil laminates have different internal structures, properties, costs, etc., and should be appropriately selected according to different protection requirements and cost requirements. .