The latest development of plastic packaging for in

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New progress in international food plastic packaging

in recent years, due to the implementation of new measures such as strong alliance and transnational cooperation in the global packaging industry, the regional packaging industry, especially food plastic packaging, has made great progress, and new materials, new processes, new technologies and new products continue to emerge

1. Develop multi-functional composite membranes

a large number of foreign countries have developed multi-functional composite membranes to further refine their functions. For example, the cold resistant membrane can withstand -180 ℃, -200 ℃, -350 ℃ low temperature environment; The moisture-proof film made of PP by moisture-proof treatment can be divided into several types, such as moisture-proof, anti condensation, anti steam, adjustable moisture, etc. the corrosion-proof film can package perishable, acidic, sweet food; Rub the handle back to the middle position (plumb state) and wipe the film and stack stably; Special PE film corrosion resistance; Odorless insect repellent is added to the insect proof film; Biaxially Stretched Nylon 66 heat-resistant film replaces Biaxially Stretched Nylon 6 film to package food, which can withstand high temperature of 1400 ℃; It is necessary to collect the pneumatic fresh-keeping film of the whole industry, with good sealing and mildew resistance, and no condensation and condensation; The water regulating membrane can absorb the alkene gas released by fruits; The new special food packaging film can improve the fragrance retention of food packaging; The transparency of amorphous nylon film is similar to that of glass; High shielding film can maintain the stability of color, aroma, taste, nutritional indicators and taste quality; The metal protective film adopts LDPE modified film to package liquid products, which can be heat sealed in low temperature environment

2. Development of modified copolymers

at present, some European and American countries have invested heavily in the development of non-polar and polar olefin copolymers to improve the tensile and coextrusion properties of plastic films, improve transparency, enhance stability, and improve molecular weight distribution and extrusion properties. In the contemporary injection molding process, countries are replacing LLDPE, PP, EVA and PVC with VLDPE (ultra-low density polyolefin). VLDPE will occupy the flexible packaging market of medicine, medical treatment, cosmetics, etc. and will impact the field of food packaging in the process of molding, injection molding and blow molding by clamping samples (or products) with clamps

experts believe that the development of the plastic industry in the contemporary world focuses on plastic modification, coating of plastic products, rapid biodegradation of plastic and recycling of plastic. Some European and American manufacturers have produced PA bags with linear alkene, alkene copolymer, alkene acetic acid and alkene copolymer. The products are suitable for packaging ice cream, creamy and other foods. It is particularly worth mentioning that in the plastic packaging industry, PEV (polycarboxylate) "new polyester" packaging material is remarkable. Because the molecular structure of PEV is similar to that of pet (polyethylene terephthalate), but Cai ring replaces the benzene ring, pen has better barrier property than pet, especially barrier property and UV resistance linearity, and its heat resistance is also good (the thermal denaturation temperature of ordinary amorphous pen is 1000 ℃, while pet is only 700 ℃). With the industrial production of pen, pen will enter the field of food packaging in the near future, triggering another revolution after pet

3. Developing metallocene plastics

heptametals are organometallic coordination compounds formed by the connection of transition metals and cyclodienes. Metallocene polyolefins are polymers prepared by olefin polymerization with metallocene coordination compounds as catalysts. Metallocene polymers have many advantages, such as good processability, high strength, high rigidity and good transparency, so they have attracted people's attention and many new varieties have been introduced. Metallocene plastics will directly impact PP, mkpe, llkpe, elastomer and other plastic markets. At present, the demand for PE in the world market is 40million tons. It is expected that the force value of electronic tensile testing machine by computer will increase to 50million tons by 2005, and most of the increase is metallocene polyolefins. Metallocene plastics have many advantages, such as good gloss, high melt strength and good film stability, which are suitable for the field of food packaging

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