河北定盈科技有限公司

塑料制品在模具中由于冷却水管的作用，热量由模腔中的塑料通过热传导经模架传至冷却水管，再通过热对流被冷却液带走。少数未被冷却水带走的热量则继续在模具中传导，至接触外界后散溢于空气中。注塑成型的成型周期由合模时间、充填时间、保压时间、冷却时间及脱模时间组成。其中以冷却时间所占比重最大，大约为70%～80%。因此冷却时间将直接影响塑料制品成型周期长短及产量大小。脱模阶段塑料制品温度应冷却至低于塑料制品的热变形温度，以防止塑料制品因残余应力导致的松弛现象或脱模外力所造成的翘曲及变形。
Plastic products in the mold due to the role of cooling water pipes, heat transfer from the plastic in the mold cavity through heat conduction to the cooling water pipe through the mold frame, and then through heat convection by the coolant. A small amount of heat that has not been carried away by cooling water continues to conduct in the die and spills into the air after contacting the outside world. The forming cycle of injection moulding consists of closing time, filling time, holding time, cooling time and demoulding time. Among them, cooling time accounts for the largest proportion, about 70%-80%. Therefore, the cooling time will directly affect the length of plastic products forming cycle and the size of production. In the demoulding stage, the temperature of plastic products should be cooled below the thermal deformation temperature of plastic products to prevent the relaxation caused by residual stress or warping and deformation caused by external force of demoulding