A Brief Discussion on the Process of PP Plastic Particle Injection Molding for PP Meal Mat Manufacturers

       The moisture absorption of PP plastic placemats is very low, so drying treatment is generally not required before molding. If the humidity exceeds the allowable value, drying treatment should be carried out.
       The molecular structure of PP plastic placemats contains tertiary carbon atoms, so their antioxidant capacity is very low. Antioxidants should be added during plasticization.
       When the temperature exceeds 280 ℃, PP plastic placemats will undergo thermal degradation, leading to performance degradation. Contact between the melt and the metal wall will accelerate thermal degradation. Therefore, during molding, it is important to avoid prolonged retention of the melt in the barrel.

        PP plastic placemats have good melt flowability, between HDPE and LDPE, and are easy to form thin-walled, long process plastic parts
       PP plastic placemats have a large range of crystallinity and molding shrinkage, which is 1.0%? 3.0%, with obvious post shrinkage, it is prone to shrinkage, indentation, and deformation, and has strong directionality
       The melting point and melt enthalpy of PP plastic placemats are higher than LDPE, and they release more heat during crystallization and cooling processes. Therefore, the mold should have a good cooling system to reduce plastic deformation.