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source： time,time：2015-09-18 14:47:01

cpp is produced by casting plastic industry in the extrusion process of polypropylene (pp) film. this kind of films and bopp (bopp) thin films with different, non oriented films. strictly speaking, cpp films in the longitudinal direction only (md) has certain orientation, is mainly due to the nature of the process caused by. through the cold roll on rapid cooling
however, the formation of excellent clarity and smoothness in the film.

(a) including the main characteristics of cpp films, ldpe, and lldpe: hdpe, pet, pvc and other films, lower cost, higher yield.
- film stiffness higher than pe.
- moisture and odor barrier excellent.
multi - function, can be used as composite membrane.
- metal treatment.
as food and commodity packaging and packaging, has demonstrated excellent, can make the products in the packaging is still visible.
although some pp films were produced by casting process, for health or as a synthetic paper containing fillers and other additives, but the term usually refers to cpp films for high definition film is laminated, metal and packaging applications.
(two) the current and potential uses
the current uses of cpp include: clothing, knitwear and flower packaging bags; packaging; pouch; file and photo film; food packaging; and for barrier packaging and decoration of metal film.
potential applications include: blister packaging (instead of pvc); food packaging; candy packaging (twisted film); drug packaging (shu yedai); instead of pvc in the album, folders and files and other fields; synthetic paper; adhesive tape; report cover; card holder; ring folder and composite bag stand.
cpp film is so attractive, because of low cost, compared with pet, lldpe, ldpe and other materials, has a price advantage. compared with lldpe, the density difference between 5%~10% and 2% is spread the other attractions. furthermore, due to rapid cooling properties of cast film inside, can form excellent smoothness and transparency. for the packaging use requirements higher definition, the characteristic of the pp film is a preferred material. it can provide a transparent window, with clearly visible, especially suitable for soft packaging market. through after corona treatment, to use a variety of printing process. the final appearance of films to improve the properties of the.
cpp excellent heat resistance. the pp softening point is about 140 deg c, the film can be used for hot filling, cooking bags, aseptic packaging etc.. with acid and alkali resistance, oil resistance and excellent performance, make it become the preferred material field of bread product packaging or laminated material. the food contact safety, demonstrating excellent performance, will not affect the flavor of the food packing, and can choose different grades of resin to obtain the desired characteristics.

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