Due to the high processing temperature of PPA plastic pepper ball, the main defect of the product after injection molding is the shrinkage of the blank ball, and the surface of some blank balls will shrink into a small hole. The original drawing of shrinkage mainly has the following aspects.

During PPA injection molding, the temperature of the barrel of the injection molding machine is too high. After injection molding, the plastic will shrink after cooling, resulting in shrinkage. The higher the injection temperature, the more serious the shrinkage.

During PPA injection molding, the temperature of the barrel of the injection molding machine is too high. After injection molding, the plastic will shrink after cooling, resulting in shrinkage. The higher the injection temperature, the more serious the shrinkage.

The pressure holding time of PPA plastic pepper ball molding is insufficient, because when PPA is injected, the rubber compound will shrink after entering the mold cavity, and when the vacancy generated after shrinkage needs pressure holding by the machine, the rubber compound will continue to be injected into the mold to ensure that the position where the rubber is injected will not shrink.