1. Tube temperature:
Generally, the temperature at which the resin is melted by means of power heating. The temperature rise of plastics from solid state to molten state is mainly due to the temperature of feed pipe and the shear heat given by screw rotation. Theoretically, their share of energy supply is 3:7.
As for the temperature setting of the feed pipe, different temperatures are set according to different raw materials. During this period, the temperature of the front end (nozzle area) is slightly lower than that of the middle end to avoid runny nose; The rear end (feeding area) should also be lower than the middle end and 20-30 degrees lower than the front end, mainly to avoid abnormal feeding. Another is that the exhaust will be good, and the product is not easy to have silver wire and other defects.
Generally, plastics with different properties have relatively standard molding temperatures, such as ABS = (distinguish between high impact material 230-260 and low impact material 190-230), San = 180-220, hips = 180-220, POM = 170-200, PC = 240-300, ABS / PC = 230-260, PMMA = 200-230, PVC = (distinguish between high density 160-200 and low density 140-180), PP = 180-230, PE = (distinguish between high density 240-300 and low density 180-230); TPE = (distinguish between high density 170-200 and low density 140-180), TPR = (distinguish between high density 170-200 and low density 140-180), TPU = (distinguish between high density 160-200 and low density 120-160) Pa = 230-270, PA + fiber = 250-300, PBT = 200-240, PBT + fiber = 240-280. In addition, the molding temperature of flame retardant (i.e. fire retardant) shall be 20-30 ℃ lower than that of ordinary materials. The specific application temperature depends on the production situation, because the molding temperature directly affects the fluidity, viscosity, mold temperature, color, shrinkage, product deformation, etc.
