The direction of plastic development can be summarized […]
The direction of plastic development can be summarized in two aspects. The first is to improve the performance, that is, to modify the existing varieties in various ways to improve their comprehensive performance; the second is to develop the function, that is, to develop polymer materials with physical functions such as light, electricity and magnetism, so that the plastics can have Photoelectric effect, thermoelectric effect, piezoelectric effect, etc.
From the current development speed of the world plastics industry, Germany and Sweden rank first, followed by some countries in Japan and Europe, and the United States is slower. Foreign plastic packaging presents the following trends:
Copolymer composite packaging film
At present, some countries in Europe and America invest heavily in the development of non-polar, polar ethylene copolymers, which will greatly improve the stretching and co-extrusion properties of plastic film, and improve transparency, sealing strength, stress resistance, crack resistance, and stability. Improve molecular weight and extrusion rheological properties.
Foreign experts believe that the current development of the world's plastics industry focuses on plastic modification, coating technology for plastic products, rapid biodegradation of waste plastics, and comprehensive recycling technology for plastics. For example, some manufacturers in Europe and America adopt a linear ethylene-α-olefin copolymer and an ethylene-vinyl acetate copolymer/PA bag, which is suitable for packaging ice cream, milk fat and the like.
Multifunctional composite film
A large number of multi-functional composite films have been developed abroad to further refine their functions. For example: cold-resistant film can withstand -18 ° C, -20 ° C, -35 ° C low temperature environment; moisture-proof film made of moisture-proof treatment of PP, its series of products can be divided into moisture-proof, anti-condensation, anti-cooling, adjustable moisture Several types; anti-corrosion film can package perishable, acidity, sweetness of food; friction film stacking stability; special PE film resistant to chemicals, corrosion; odor-free film added odor-free insecticide; The heat-resistant film of nylon 66 replaces the biaxially stretched nylon 6 packaged food, which has a high temperature resistance up to 140 ° C; the new special food packaging film can improve the aroma of the food packaging; the amorphous nylon film has transparency similar to glass; the high shielding film can protect Color, aroma, taste, nutritional index and stability of taste quality; metal protective film is packaged with LDPE modified film for liquid product, which can be heat-sealed in low temperature environment; PP synthetic paper is used to improve the light resistance, cold resistance and resistance of the package. Heat, water resistance, moisture resistance, grease resistance, acid resistance, alkali resistance and impact resistance.