Shanghai Daoqin Plastics Co., Ltd.

injection molding process in most important process conditions is effect/influence flow and cooling temperature degree, pressure, speed degree and versus 应 各 function time. this factors between also is versus effect/influence and made 约, improve/increase melt, mold temperature degree, can reduce injection pressure and speed degree and other, 反之则 need increase injection pressure and speed degree. various process conditions in effect/influence core in plastics viscosity 变化, this for/regarding injection process in parameters combined selection and versus between effect/influence important.
injection speed degree high low features

（一） in injection process in using/adopting high speed injection in below/following advantages:

⑴ decrease/reduce injection time, shrink short molding cycle;

⑵ improve/increase plastics process/workflow, has thin made parts molding;

⑶ improve/increase products surface gloss degree;

⑷ can improve/increase weld lines strong/high degree, make 熔接纹不 obvious;

⑸ anti generate cooling deformation and other.

（二） in injection process in using/adopting low speed injection in below/following advantages:

⑴ anti molding products generate flash;

⑵ anti generate jetting and flow 纹;

⑶ anti generate 燃烧印;

⑷ anti plastics melt generate gas phenomenon;

⑸ anti generate separation orientation deformation and other.

high speed injection advantages positive is low speed injection disadvantages, 反之亦然. therefore, in injection process in using/adopting high speed and low speed combined can separation utilizing advantages, 避免各自 disadvantages, from ensure product quality and process property. this is 我们平常 指 more grade injection technology, this in injection molding machine upper already use. currently large more in type above injection molding machine already has 五～六 grade injection pressure, speed degree 变化以 and 三～四 grade holding pressure pressure 变化（因 holding pressure stage/phase, melt already type 腔, 此时熔 material holding pressure pressure type 腔 补 shrink material already has 限, holding pressure speed degree effect/influence large ）.