Pp movie is polypropylene movie, a thermoplastic resin prepared by using polymerization of propylene. Commonly thick, hard, high tensile strength, may be used for greenhouse film, bearing baggage, etc.
Polypropylene is a non-toxic, odorless, tasteless, opalescent, enormously crystalline polymer with a density of handiest zero.90 — zero.91g /cm3. It’s far one of the lightest kinds of all plastics. It’s far specifically solid to water, in the water absorption fee is best 0. 01%, the molecular weight of approximately eight thousand a hundred and fifty thousand.
Polypropylene isn’t proof against oxidation at high temperatures. Bidirectional polypropylene movie is an critical packaging fabric in plastic merchandise. According to information, the arena’s plastic used in packaging bills for 35% of the total consumption of plastic.
1, pp cup sealing film-performance
Polypropylene has excessive crystallinity and everyday structure, so it has notable mechanical residences. The absolute price of mechanical residences of polypropylene is higher than that of polyethylene, but it’s miles still a low range in plastic substances, and its tensile electricity can handiest attain 30 mpa or slightly higher degree.
Polypropylene with larger isometric index has better tensile energy, but with the increase of isometric index, the effect electricity of the fabric decreases, however does no longer trade after reducing to a certain price.
2, pp cup sealing film-the traits of
It is tougher than pe and has a better melting factor.
Due to the fact homopolymer pp temperature above 0c may be very brittle so many business pp substances are delivered 1~four% ethylene random copolymers or better ratio ethylene content clamp copolymers.
Polymer pp materials have decrease thermal twisting temperature (100c), low transparency, low gloss, low rigidity, but have stronger effect power. The power of pp extended with the increase of ethylene content.
The vicar softening temperature of pp is 150c. Because of the excessive crystallinity, the floor stiffness and scratch resistance of this material are superb.
Pp has no environmental strain cracking trouble. Normally, pp is modified by means of including glass fiber, steel additives or thermoplastic rubber.
The mfr of pp ranges from 1 to 40. Pp cloth with low mfr has better impact resistance but lower tensile electricity. For substances with the identical mfr, the electricity of copolymer type is higher than that of homopolymer kind.
Due to crystallization, the shrinkage of pp is pretty excessive, commonly 1.8~2.5%. And the course uniformity of shrinkage fee is a whole lot higher than pe-hd and different materials. Adding 30% glass additive can lessen the shrinkage to zero.7%. Homopolymer and copolymer pp substances have tremendous moisture resistance, acid and alkali corrosion resistance, solubility resistance. But, it has no resistance to aromatic hydrocarbon (consisting of benzene) solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, and so on. Pp additionally does not have oxidation resistance at high temperature like pe.
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In conclusion,the pp cup sealing film is made of polypropylene and contains a reactive adhesive. This adhesive, when heated, creates a seal between the cup and the film. The film can be used to seal cups before or after they are filled with hot or cold liquids, or food products.
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