Shanghai Daoqin Plastics Co., Ltd.

         modified engineering plastics in injection molding production process in, temperature degree low has cold material 残留, pressure loss large product surface easy cold material or force 痕, high easy 溢胶, has wire drawing, modified engineering plastics injection molding generate wire drawing commonly used solution methods has:

        (1) drop temperature degree; (2) add large 回抽位置; (3) reduce back pressure; (4) use base/seat 退; (5)射咀 and between add sheet/slice or metal sheet/slice;---- its is decrease small 射咀 实际口径; (6)唧咀里 add sheet/slice;

         analysis 1: 回抽 has types methods --- front and rear 回抽; its control methods has types --- time and 位置(has machine, is 靠射台 upper front rear device control, more also is in control sheet/plate 输入) control; front more use in holding pressure pressure especially large lower, based on function force and function force features, outer pressure (large holding pressure)消 remove rear, screw front 端 熔胶会 for screw add large function force let screw rear 退, screw “越位”, amount 不准; rear more is for high speed material, is 怕“越位” and 保护回 material 油封(high speed as to 突然静止, is non 常违反 force 学常规).

         analysis 2: need screw 越位, need 先知晓 screw rear process, screw rear is in uniform lower material, pressure shrink, 输送, amount lower in, 若不吃 material or material to amount, 而位置却退 to versus 应 额 degree, that 么, 实际 计 amount and demand amount has 差异;简而言之, screw 越位, is in amount process in, screw has 旋转计 amount is slip 回抽一定 距离, 导致计 amount phenomenon.