Shanghai Daoqin Plastics Co., Ltd.

holding pressure time setting is is control holding pressure generate function time, holding pressure time setting will make product dimensions, weight 不安定. holding pressure time setting long, also effect/influence formed efficiency. holding pressure time is to gate solid time can, meanwhile holding pressure large small and holding pressure time 适当配 combined, can make 程序式 holding pressure control most large use. holding pressure is injection shot 终 时密封注道 and 因体积 shrinkage 补偿, therefore holding pressure must high internal pressure. holding pressure time setting if in most large has holding pressure time front 停止, 亦 即 holding pressure time short, can can generate lower 列之结果: 1.凹陷; 2. bubbles; 3. weight 不足; 4. dimensions relatively small; 5. due to 熔胶之回流 generate internal toward 6. more high warpage, especially in semi crystallization property material; 7. more large dimensions 波动; 8. shrinkage rate increase setting has 效. holding pressure time less must to solid 化, generally is cold time 30%即够.