Temperature control for powder metallurgy injection molding mold

The mold temperature is controlled by the cooling medium (usually water) In the process of powder metallurgy injection molding（http://www.zcmim.com/） which determines the cooling speed of the plastic melt. The lower the mold temperature and the faster the cooling speed, the melt temperature decreases more rapidly which induce the increased melt viscosity, injection pressure loss increased, and even lead to a serious shortage of mold filling.

With the increase of the mold temperature, the melt flow increases, then the mold filling pressure decreases and the surface quality of the product is improved; but because of the cooling long time can induce the productivity of the product is decreased, and the molding shrinkage rate of the product is increased. For crystalline plastics, because of the high temperature is good to crystallization, so increasing the temperature of the mold can improve the density of the product or structural crystal. In the higher mold temperature products, the polymer relaxation process is fast, the molecular orientation and internal stress will be reduced.

Original article link：

http://www.zcmim.com/article/powder-metallurgy-injection-molding-tcfpm_1.html