Shanghai Daoqin Plastics Co., Ltd.

cooling type process is from gate “封冻”开始至 products demolding is 止, cooling type process features is temperature degree performance is main/primary. generally from gate to products demolding, still in type in cooling time, ensure products demolding has rigid degree 而不致扭曲 deformation. process in, mold cavity inner melt temperature degree 逐渐变 low, type pressure and holding pressure time has 关, holding pressure time long, type residual stress large.

demolding 时理想 residual stress is 零, residual stress large 于零, demolding difficult; residual stress small 于零, products surface easy 出现凹陷 or internal generate true 空泡. plastics 体积 变化规律实际 upper is plastics density 变化规律, holding pressure time long gate 冻结时 plastics temperature degree high, type pressure high products density large; holding pressure time 一定, demolding temperature degree high, although mold cavity pressure high, products density small, demolding rear products will generate relatively large rear shrinkage, make products internal generate relatively large internal stress. plastics made parts in inner cooling tool has rigid degree can demolding. demolding temperature degree high, generally control in heat deflection temperature (HDT) and mold temperature degree between.