Shanghai Daoqin Plastics Co., Ltd.

maintain pressure setting is is make resin in cooling process in generate 回流, can 继续补充因 resin cooling shrinkage 而不足 空间, to most 佳 injection molding parts mold made 效果. maintain pressure setting high, easy formed flash/burrs, degree gate 附近 应 force in and other defect phenomenon, maintain pressure setting low, also easy formed shrinkage large, dimensions 不安定 and other phenomenon. maintain pressure must holding pressure 切换点 and holding pressure time setting is has 效. holding pressure 不足时会导致: 1.凹陷; 2. bubbles; 3. shrinkage rate increase; 4. formed product dimensions small; 5. dimensions property large; 6. due to 熔胶回流导致 inner toward. large holding pressure 则会造 formed: 1.注道(Sprue)区域 应 force; 2. demolding difficult; 3. outer tensile force. holding pressure time stage/phase reduce holding pressure can （ more holding pressure ）: 1. decrease/reduce warpage, reduce from gate to formed product 区域之 shrinkage 变异; 2. decrease/reduce internal stress; 3. decrease/reduce can loss consumption. Shanghai plastics has company