Shanghai Daoqin Plastics Co., Ltd.

         in injection production in, plastics injection molding processing parts cooling time 约占整 injection production cycle 80%. cooling defect 常常导致 products warpage deformation or generate surface defects, effect/influence products dimensional stability. combined 理 安排 injection, holding pressure and cooling time, can improve/increase product quality and production rate.

         made parts cooling time, usually is plastics melt from injection molding mold type to can mold opening made parts this time. can mold opening made parts time standards, made parts already separation solid 化, tool has strong/high degree and rigid property is 准, in mold opening ejection 时不致 deformation cracking.

        即 make is use types plastics molding, it cooling time 也随壁 thick, melt plastics temperature degree, molding parts demolding temperature degree and injection molding mold temperature degree 而异. need in has combined lower can separation positive 确 计算出 cooling time currently 尚未发 table/sheet, has in false 定 基础 upper 进行计算 公式. 计算公式 also cooling time different 而异.

         currently, usually below/following types standards as is cooling time based on:

        ① plastics injection molding processing parts most thick in temperature degree, cooling to plastics heat deflection temperature (HDT) below/following need time;

        ② plastics injection molding processing parts inner temperature degree, cooling to products mold temperature degree need time;

        ③ crystallization property plastics molding parts most thick separation in temperature degree, cooling to its melting point below/following need time, or to crystallization percentage time.

         in understanding 公式时, generally as below/following false 设:

        ① plastics injection in injection molding mold inner, hot amount to injection molding mold by cooling;

        ② molding inner plastics and mold cavity 紧密接触, cooling shrinkage separation 离, melt and 模壁间 hot and flow 无任何 retardant force, material and 模壁接触 瞬间 its temperature degree already same. plastics mold cavity rear, made parts surface temperature degree and other 于模壁 temperature degree;

        ③ plastics injection molding processing parts cooling process in, injection molding mold type surface temperature degree maintain 均一;

        ④ injection molding mold surface hot 传导程 degree 一定;(熔 material process is and other temperature process, material temperature 均一);

        ⑤ plastics orientation and hot force for made parts deformation effect/influence can 忽略, made parts dimensions for solid temperature degree 不发生 effect/influence.