pp board product name: copolymer type PP material has lower thermal distortion temperature (100°C), low transparency, low gloss, low rigidity, but has stronger impact strength. Strength of PP
increases with the increase of ethylene content. The Vicat softening temperature of PP is 150°C. Due to the high crystallinity, the surface rigidity and scratch resistance of this material are very good. PP does not have the problem of environmental stress cracking. Usually, the PP is modified by adding glass fiber, metal additives or thermoplastic rubber. The flow rate MFR of PP ranges from 1 to 40. PP materials with low MFR have better impact resistance but lower elongation strength. For materials with the same MFR, the strength of the copolymer type is higher than that of the homopolymer type. Due to crystallization, the shrinkage rate of PP is quite high, generally 1.8~2.5%. And the direction uniformity of shrinkage is much better than that of PE-HD and other materials. Adding 30% of glass additives can reduce the shrinkage to 0.7%. Both homopolymer and copolymer PP materials have excellent moisture absorption, acid and alkali corrosion resistance, and solubility resistance. However, it has no resistance to aromatic hydrocarbons (such as benzene) solvents, chlorinated hydrocarbons (carbon tetrachloride) solvents, etc. PP does not have oxidation resistance at high temperatures like PE.
pp sheet production line characteristics and uses
PP sheet production line screw adopts special mixing function and high plasticization capacity design. PP sheet production line hanger-type die head adopts special double throttling design to make sheet thickness adjustment more accurate. Temperature control can accurately control the plasticization process and sheet Thickness, flatness. The purpose and characteristics of the PP sheet production line are:
1 The screw is designed with special mixing function and high plasticizing ability.
2 The hanger-type mold adopts a special double throttling design to make the thickness adjustment of the plate more precise.
3 The temperature control can accurately control the plasticizing process and the thickness and flatness of the plate.
4 Three-roll calender adopts horizontal, vertical or 45 degree inclined type.
