The polyvinyl alcohol high insulation composite film has outstanding insulation function and meets environmental protection requirements, so the shopping mall prospect of this kind of packaging information is very bright. Polypropylene is polymerized from propylene. The PP type of copolymer type has lower heat distortion temperature (100 ° C), low brightness, low gloss and low rigidity. It has stronger impact strength and two-way pull. A polypropylene film is obtained by mixing a polypropylene material and a functional additive with a special production line, melt-kneading, forming a sheet, and then stretching to form a film. It is widely used in the packaging of food, candy, cigarettes, tea, juice, milk, textiles, etc. In addition, it can also be applied to the preparation of high value-added functional products such as electrical film and microporous film. Therefore, the development prospect of polypropylene film is very promising. broad.
Plastic films are ubiquitous in our days. Plastic films are divided into: industrial films: blown film, calendered film, crepe film, cast film, etc.; agricultural shed film, mulch film, etc.; packaging film (including medicinal use) Packaging composite film, food packaging composite film, etc.). Plastic films are commonly used in packaging, construction, and as a laminate.
The functional characteristics of plastic film mainly include: non-clear, moisture barrier, gas barrier, low temperature resistance, high temperature resistance, heat sealability, and printability.
Advantages and disadvantages of plastic film: bright, flexible, outstanding waterproof function, good mechanical strength, chemical stability, grease resistance; of course, it has certain problems, such as: poor aging resistance; easy to burn; large thermal expansion coefficient, The scale is stable.
A wide variety of plastic films such as: PVA coated high-barrier plastic film, the market prospects of this kind of packaging materials is very bright, there is a broad market space in the food industry. Biaxially stretched polypropylene film, polypropylene film has the advantages of low density, good corrosion resistance and good heat resistance, and the film has good optical properties, high mechanical strength and abundant raw material sources.
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