according to insiders, the world packaging materials market, film production sustained upward trend, film industry is entering a new round of investment boom.our casting thin film production started in the 80's of last century, with the continuous development of nearly 20 years of growth, has become a considerable production capacity and production levels of the sunrise industry in the packaging industry. cast polypropylene film (cpp) by a non stretch, non directional flat melt casting production of squeeze film cooling.the film is characterized and compared, production speed, high yield, transparent, gloss, thickness uniformity is good, an excellent balance of properties.at the same time, because it is a flat film, subsequent processes such as printing, composite is very convenient, so it is widely used in textiles, flowers, food, daily necessities packaging. the production of cpp with single and multi-layer co extruded cast in two ways.the main requirements of low temperature thin film material sealing performance and good flexibility.multi-layer co extruded film can be divided into the heat sealing layer, support layer, corona layer three layer, in the choice of materials is monolayer wide, can meet the requirements at all levels of material choice alone, given to the function and the use of different films.the heat sealing group to heat seal processing, the material requirements of low melting point, good hot melt, heat sealing temperature should be wide, easy to seal; the support layer to support the film, the film was increased stiffness; corona layer should be printed or metal processing, require moderate surface tension, have strict restrictions on the additives should be. cpp printing, bag can be used for packaging food, clothing, towels, etc. the health of flowers.in addition, due to its excellent transparency, low heat sealing temperature, but also be used as composite membrane membrane, such as pet film, bopp film and other compound, used for fast food packaging products, such as tea; and barrier resins evoh, pa, pvdc etc. through the adhesive compound, to packaging or food containing fat soup.others such as high temperature and medium temperature cooking film, vacuum film is the most important application fields. with the increasing market demand, film products and materials used in the increasingly updated.the development of new products of cpp mainly concentrated in the ultra low temperature sealing film, cold film, high temperature cooking film.some special-purpose film is also in the development of applications, such as anti-static film, pesticide film, high transparent super soft soft film is gradually pushed to the market, to occupy new areas of application.
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