Shanghai Daoqin Plastics Co., Ltd.

1). plastics material plastics material property can complex property 决定 injection molding parts molding process complex property. plastics material property can also product types different, grade different, production injection molding parts processing different, batch different 而差异 relatively large. different property can parameters can can 导致完 full different molding 结果. 2). injection temperature degree melt cooling type 腔, hot 传导而 dispersion hot amount. and meanwhile, due to function generate hot amount, this separation hot amount can can relatively hot dispersion hot amount more, can can less, main/primary 取决于 injection molding parts conditions. melt viscous property temperature degree rise high low. this 样, injection temperature degree high, melt viscosity low, 需 充填 pressure small. meanwhile, injection temperature degree to thermal degradation temperature degree, separation understanding temperature degree made. 3). injection molding parts mold temperature degree injection molding parts mold temperature degree low, hot 传导而 dispersion hot amount speed degree fast, melt temperature degree low, flow property 越差. using/adopting relatively low injection speed rate 时, this type of phenomenon especially obvious. 4). injection time injection time for injection molding parts process effect/influence performance in 三 方面: （1） shrink short injection time, melt in 剪应变 rate improve/increase, is type need injection pressure need improve/increase. （2） shrink short injection time, melt in 剪应变 rate improve/increase, due to plastics melt 剪切变 dilute features, melt viscosity reduce, is type need injection pressure need reduce. （3） shrink short injection time, melt in 剪应变 rate improve/increase, 剪切发 hot large, meanwhile hot 传导而 dispersion hot amount less, therefore melt temperature degree high, viscosity low, is type need injection pressure need reduce. above types 情况共同 function 结果, make type need injection pressure 曲线呈现“U”形. is 说, in injection time, 此时 需 injection pressure most small Shanghai plastics has company