Cast polypropylene film is a polypropylene film produced by casting process, which can be divided into ordinary CPP and cooking CPP. It has excellent transparency, uniform thickness and uniform performance in vertical and horizontal directions. It is generally used as the inner material of composite film. The thickness of ordinary CPP film is generally 25 50 μ M. after compounding with OPP, it has good transparency, bright surface and strong hand feeling. This material is used in general gift bags. The film also has good heat sealing property. The thickness of cooking grade CPP film is generally 60 80 μ M, it can withstand high-temperature cooking at 121 degree for 30 minutes, has good oil resistance and air tightness, and has high heat sealing strength. Generally, the inner layer of meat packaging adopts cooking grade CPP film.
CPP film has the characteristics of good transparency, high gloss, good stiffness, good moisture resistance, excellent heat resistance and easy heat sealing, and its inclusion resistance and packaging machinery applicability are better than polyethylene film. Therefore, CPP film occupies a certain position in the field of packaging film. After printing and bag making, CPP film is used for the packaging of food, stationery, groceries and textiles, It can also be used after compounding with other thin films. It is generally used as the inner and outer layer material of composite films. It is applied to the packaging of various foods, including foods that need to be heated and sterilized, condiments, soups and daily necessities.
English name of PP plastic (polypropylene): Polypropylene specific gravity: 0.9-0.91g/cm3
Molding shrinkage: 1.0-2.5 percent
Forming temperature: 160-220 degree
Material properties: low density, strength, stiffness, hardness and heat resistance are better than low-pressure polyethylene. It can become brittle at low temperature, not resistant to mold and easy to aging It is suitable for making general mechanical parts, corrosion-resistant parts and parts at about 100 degrees It has good electrical performance and high-frequency insulation, which is not affected by humidity, but the edge parts.
