The development direction of plastics can be summarized in two aspects. The first is to improve performance, that is, to modify existing varieties by various methods to improve their comprehensive performance; the second is to develop functions, that is, to develop polymer materials with optical, electrical, magnetic and other physical functions, so that plastics can have Photoelectric effect, pyroelectric effect, piezoelectric effect, etc.

Judging from the current development speed of the world's plastics industry, Germany and Sweden rank first, followed by Japan and some European countries, and the United States is slower. Foreign plastic packaging presents the following development trends:

Copolymer composite packaging film

At present, some countries in Europe and the United States have invested heavily in the development of non-polar and polar ethylene copolymers, which will greatly improve the stretch and co-extrusion properties of the plastic film, and improve the transparency, sealing strength, stress resistance, crack resistance, and stability. , Improve the rheological properties of molecular weight cloth and extrusion.

Foreign experts believe that the current development of the world's plastics industry focuses on plastic modification, plastic product coating technology, rapid biodegradation of waste plastics, and comprehensive plastic recycling technologies. For example, some European and American manufacturers adopt a mixture of linear ethylene-α-ene copolymer and ethylene-vinyl acetate copolymer/PA bag, which is suitable for packaging foods such as ice cream and milk fat.

Multifunctional composite film

A large number of multifunctional composite films have been developed abroad to further refine their functions. For example: cold-resistant film can withstand -18℃, -20℃, -35℃ low temperature environment; moisture-proof film made of PP with moisture-proof treatment, its series of products can be divided into moisture-proof, anti-condensation, anti-steam and cold, and adjustable moisture The anti-corrosion film can be used for packaging perishable, acidic, and sweet food; the friction film is stable in stacking; the special PE film is chemically and corrosion-resistant; the moth-proof film is added with odor-free insect repellent; in two directions The heat-resistant film of stretched nylon 66 replaces biaxially stretched nylon 6 for food packaging, and its high temperature resistance can reach 140°C; the new special food packaging film can improve the fragrance retention of food packaging; the transparency of the non-crystalline nylon film is similar to glass; the high-shielding film can maintain The stability of color, aroma, taste, nutritional indicators and taste quality; metal protective film uses LDPE modified film to package liquid products, which can be heat-sealed in low temperature environments; PP synthetic paper is used to improve the light resistance, cold resistance and resistance of the packaging Heat resistance, water resistance, moisture resistance, grease resistance, acid resistance, alkali resistance and impact resistance, etc.

At present, plastic cups and composite cups (outer layer PSP, inner layer PP, cover PS) are popular abroad for packaging cold and hot beverages, wine, and convenience foods. France uses PE bottles to package fructose and yogurt, and Germany uses PC bottles to package milk. my country uses PE bottles for packaging medicines.