Its operating temperature range is -18-135 degrees, both low temperature cold storage, and high-temperature cooking. It is often used in some aromatic and greasy food packaging, can significantly extend the preservation of these foods Lu, Paul pilgrimage.
Polycarbonate (PC) which has good transparency and mechanical properties are very good dimensional stability, good heat resistance, is a very packaging design excellent packaging material, but expensive limiting its wide application. It can be made into films, sheets, and containers, with a high impact resistance. Generally use it to make food trays, bowls and many other daily necessities. plastic trays
Polyvinyl alcohol (PVA) film transparency which has good gloss, excellent gas barrier properties. Strength and toughness. clear plastic box Chemical stability, except water from hydrocarbons, alcohols ketones, solvent oil, ordinary erosion. Without static, good printing. It is non-toxic, odorless, packaging company can be directly made into a film for packaging food containing oil. The composite of the other film, permeable to overcome the shortcomings, improved gas barrier properties, it plastic package is widely used in meat, butter, cheese and fast food packaging.
Ethylene vinyl alcohol copolymer (EVOH) which is the hydrolysis product of EVA, a high permeability material. Its most prominent advantage is oxygen, nitrogen, and carbon dioxide gas barrier properties and excellent retention of aroma. In addition, it has good oil resistance and organic solvent capability for packaging oily food and cooking oil.
In addition to the plastic packaging materials, there are many other plastic packaging materials plastic case such as PVC, PS clamshell packaging and so on, and many deep-processed products. Many of these products, especially the composite material is more worthy of our study and discussion.
Flexible packaging material is a flexible composite materials of two or more different layers of flexible material, through a combination of multi-layer material technology, the use of a plastic composite substrate, foil, paper, cellophane. Used in food packaging plastic packaging materials and other composite materials accounted for a large proportion. Therefore, plastic packaging materials in food packaging applications is extremely broad. vac tray Has a very important position.
With the participation of plastic packaging materials composite flexible packaging materials and its overall performance is good, with high strength, high barrier, high temperature resistance, good adaptability packing to do gymnastics, health and safety, to meet the full range of materials food packaging requirements. Composite materials for food packaging structural requirements as follows:
Inner material requirements nontoxic, odorless, oil resistance, chemical resistance, heat sealability and adhesion. Often have a PE, CPP, EVA and other thermoplastic materials.
Outer material requires good optical properties, clear plastic packaging good printability, high strength and rigidity. The outer material commonly used PET, PA, BOPP, aluminum foil, and paper and other materials.
If required the composite material has a high barrier to the intermediate layer, the intermediate layer material used is plastic box aluminum foil and PVDC plastics products barrier properties and so on.
Composite expression is: from left to right from the outer to the inner order. Such as PET / PVDC / CPP, the outer layer of PET, the middle layer of PVDC, inner layer of CPP. The process of the composite layer substantially legal, coating, co-extrusion, vacuum coating. If you need to increase the shelf life of food, plastic composite packaging materials is an ideal choice.
With the deepening of the market economy, food packaging are constantly to practical, beautiful, inexpensive and so forward, many packaging technology research workers are constantly explore new plastic packaging materials used in food packaging. New technologies such as plastic packaging nano into plastic packaging materials. With the progress of the times and I believe there will be more new plastic packaging materials applied to food packaging. Plastic packaging materials for food packaging application prospect is unlimited!…