The global food packaging industry continues to grow together

In recent years, as the global packaging industry has implemented new initiatives such as strong alliances and cross-border cooperation, the packaging industry in the region, especially food plastic packaging, has undergone great development, and new materials, new processes, new technologies, and new products have emerged.

Development of multifunctional composite membrane

A large number of multi-functional composite membranes have been developed in foreign countries to further refine their functions. For example, cold-resistant membranes can withstand -180°C, -200°C, and -350°C in low temperature environments, and moisture-proof membranes made of PP for moisture-proof treatment. Can be divided into moisture-proof, anti-condensation, anti-vapor, adjustable water and other types, anti-corrosion film can be packaged perishable, acidity, sweetness of food; friction film stack stability; special PE film corrosion resistance; insect film Added odorless insect repellent; biaxially stretched nylon 66 heat-resistant film to replace biaxially stretched nylon 6 film packaged foods, resistant to high temperatures up to 1400°C; cling film sealing, good mold resistance, no condensation; water Regulatory membranes can absorb the olefinic gases released by fruits; new special food packaging film can improve the fragrantness of food packaging; amorphous nylon film transparency is similar to glass; high shielding film can maintain the stability of color, aroma, taste, nutrition and taste quality The metal protective film is packaged with LDPE modified film and can be heat-sealed in low temperature environment.

Development of modified copolymers

At present, some countries in Europe and the United States have invested heavily in the development of nonpolar and polar olefin copolymers to improve the stretch and coextrusion properties of plastic films, as well as increase transparency, enhance stability, and improve molecular weight distribution and extrusion performance. In the contemporary injection molding process, various countries are replacing LLDPE, PP, EVA, and PVC with VLDPE (Ultra Low Density Polyolefin). In the art of extrusion, injection molding, and blow molding, VLDPE will occupy the flexible packaging market of medicine, medical care, cosmetics, etc., and will impact the food packaging field.

Experts believe that the development of the plastics industry in the contemporary world focuses on plastics modification, coating of plastic products, rapid biodegradation of plastics, and recycling and reuse of plastics. Some European and American manufacturers have already produced PA bags with blends of linear olefins, olefin copolymers, and ene-acetic acid and olefin copolymers. The products are suitable for packaging ice cream, milk fat and other foods. Particularly noteworthy is the fact that the plastic packaging industry is eye-catching with the PEV (polydicarbitol) ester "new polyester" packaging material due to the molecular structure of PEV and PET (polyethylene terephthalate). Similar, but instead of the benzene ring with Caihuan, PEN has more excellent barrier properties than PET, especially barrier and UV resistance, and its heat resistance is also good (normal amorphous PEN thermal denaturation temperature reaches 1000 °C, And PET is only 700 °C). As the industry adopts industrialized methods to produce PEN, in the near future, PEN will enter the food packaging field in large quantities, triggering another revolution after PET.

Development of metallocene plastics

The seven metals are organometallic coordination compounds formed by the attachment of a transition metal to a cyclic diene. Metallocene polyolefins are polymers prepared by polymerization of olefins using a metallocene coordination compound as a catalyst. Metallocene polymers have many advantages, such as good processability, high strength, high rigidity, good transparency, etc., and thus attract attention from people, and thus have introduced many new varieties.

Metallocene plastics will directly impact the plastics market such as PP, MKPE, LLKPE, and elastomers. At present, the demand for PE in the world market is 40 million tons, and it is expected to increase to 50 million tons by 2005. Most of the increase will be metallocene polyolefins. Metallocene plastics have many advantages, such as good gloss, high melt strength and good film stability, and are suitable for food packaging applications.

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