Different materials, PE: polyethylene, PP: Polypropylene
PP is a tensile polypropylene plastic, belonging to a kind of thermoplastic. The PP bag is actually a plastic bag. The characteristics of the PP bag are nontoxic and tasteless. The surface of PP bag is transparent and transparent. It is widely used in cosmetics, food, toys, clothing, stationery, electronics, hardware and other industries. PP bag color is transparent, good quality, good toughness, more strong, can not be broken. PP bag processing cost is very cheap, characteristic is: easy to burn, flame situation is melting drop, upper yellow and blue, smoke less after fire, continue to burn.
PE is the abbreviation of polyethylene, a thermoplastic resin obtained by polymerization of ethylene. Polyethylene is odorless, non-toxic, feel like wax, has excellent resistance to low temperature performance (minimum temperature can reach -70 ~ -100 C), good chemical stability, erosion resistance to most acid-base (not resistant to oxidizing acid), insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation properties; but polyethylene for environmental stress (chemical and mechanical function) is very sensitive, heat aging resistance difference. The properties of polyethylene vary depending on the molecular structure and density. The products of different density (0.91 ~ 0.96g / cm3) can be obtained by different production methods. The fresh-keeping film of the PE material can also be called the PE bag. It is necessary to choose the PE material for the direct contact with the food. It is safer for the human body.
The specific difference is mainly by the feeling of hand
PE is soft and strong, even if it is kneaded, it doesn't wrinkle.