Types, applications and surface treatment of polypropylene PP films

Polypropylene (PP) has a high melting point and excellent comprehensive properties. It is one of the most promising thermoplastic polymer materials today. Compared with other general-purpose thermoplastics, it has low price, small specific gravity, yield strength, tensile strength, surface It has excellent mechanical properties such as strength, outstanding stress crack resistance and wear resistance, good chemical stability, easy molding and processing, and a wide range of applications. It has been widely used in chemical industry, electrical appliances, automobiles, construction, packaging, etc. industry.

At present, in the packaging market, from food to sundries, plastic films are mostly used instead of paper as flexible packaging materials. Plastic films used for commodity flexible packaging must meet the requirements for product packaging materials in terms of protection, workability, convenience and economy. They must have appropriate strength, barrier properties, stability, safety, beauty, transparency, and economy and convenience.

CPP films can be divided into general-purpose, metallized and retort-type films. The universal type is a commonly used CPP film material, and the film can be adjusted within a certain range; the metallized type is a high-end CPP film product, which is made of polypropylene material with special processes and special specifications, requiring the film to have a higher Heat sealing strength; the retort type has higher requirements for heat resistance. Random copolymers are usually used as raw materials, and the initial heat sealing temperature is higher.

CPP film is a non-stretched, non-oriented cast extruded film. It is an unstretched polypropylene film produced by the casting method. It has the characteristics of light weight, high transparency, good flatness, good rigidity, strong mechanical adaptability, and thermal stability. Excellent sealing, moisture-proof and heat resistance, good slipperiness, high film-making speed, uniform thickness, moisture-proof, oil-resistant, excellent heat and cold resistance, easy heat sealing, and its film resistance and packaging machinery applicability Better than polyethylene film and other characteristics. It has excellent optical properties and can be used for automatic packaging.

This technology has been introduced in China since the 1980s, with a large investment market and high product added value. CPP film can be used for packaging food, medicine, stationery, cosmetics, textiles, etc. after bag making. It is used in the largest amount in food packaging. CPP film is used to package heat-sterilized food, condiments, soups, etc.; it can also be used for the surface layer, interlayer and auxiliary film of stationery products, such as loose-leaf and protective film for photos and collections, and can also be used for various labels and sample tapes.

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