What material is the packing belt made of?
PET plastic is the abbreviation of Polyethylene terephthalate in English, referred to as PET or PETP. Polybutylene terephthalate mainly consists of polyethylene terephthalate, two ester PET and polybutylene terephthalate two PBT. Polyethylene terephthalate is also commonly called polyester resin. It is a condensation of terephthalic acid with ethylene glycol and is collectively referred to as thermoplastic polyester, or saturated polyester, with PBT.
The straps are made of PP and PET, two plastic mixes. 2., the difference between machine and hand is that the thickness is different, and the requirement of machine is higher. 3., the production process is: plastic melt - - tape - forming - cooling - winding - Packaging - storage is probably the case.
The arrangement of methyl groups on the same side of the molecular backbone is called isotactic polypropylene. If the methyl group is arranged in random order on both sides of the backbone, it is called atactic polypropylene, and when the methyl group is arranged alternately on both sides of the backbone, syndiotactic polypropylene is called. In general industrial polypropylene resins, the isotactic structure is about 95% and the remainder is atactic or syndiotactic polypropylene. Industrial products are based on isotactic substances. Polypropylene also includes copolymers of propylene with a small amount of ethylene. Usually translucent, colorless solid, odorless, non-toxic. The melting point can be as high as 167 DEG C because of the highly crystalline structure. Heat resistance and corrosion resistance, products can be steam disinfection is its outstanding advantages. Small density, is the lightest general plastic. The disadvantages are low temperature resistance, low impact and easy aging, but can be overcome by modification.
The melt mass flow rate (MFR) of PP is usually at 1~100. The low MFR PP material has better impact resistance, but its strength is lower. For the same MFR material, the impact strength of copolymer is higher than that of homopolymer. As a result of crystallization, the shrinkage of PP is quite high, generally 1.6~2.0%.
