Shanghai Daoqin Plastics Co., Ltd.

1. pressure:原则 upper large plastics 射入模 inner pressure,以不出 flash/burrs is 基准 2. pressure and speed degree has separation same as used for inner.目 make raw materials 进入模 inner can uniform,彻底,适 amount 充满各角落.太 low short 射, sink marks,太 high has 毛头, saturated, mold sticking,烧焦, easy loss injection molding parts mold and internal stress high and other defect phenomenon 3. speed degree: speed degree fast slow raw materials in injection molding parts mold inner and formed product in 之状况, fast has flash/burrs, saturated,烧焦, slow short 射, sink marks,结 combined defect easy and other 4. temperature degree: raw materials different, temperature degree 各异,太 low solvent liquid color 不均, formed product internal stress increase large.因 temperature degree low increase pressure high, can can screw fracture, high, product has flash/burrs, also cooling generate temperature 差,引起 shrinkage. raw materials separation understanding,变黄,变 color, easy fracture. cooling time long, gas easy 排出,会 has gas. 5. back pressure; screw in add material rear retardant force is back pressure. its function make raw materials in pressure shrink in more add 紧密. can make raw materials gas, water from screw rear 排出. make solvent in effect/influence formed product surface gas formed 份. low has bubbles, surface 银纹. high hot,结 block,溢胶, cycle long, screw 不退. meanwhile application very important: back pressure low 时, has raw materials need 松退, has 则不必(according to various different property raw materials 调不止 back pressure). back pressure high 时务必 use 松退并 attention/notes need 不介入空 gas and 不溢胶 is 准则. 6. mold temperature high low and cooling time long short, effect/influence formed product mold sticking, sink marks, dimensions 公差, surface degree, cycle and other,应依实际际情况而适时 adjustment.另 pressure force,PC如 formed product thick need has mold temperature,才不会 generate bubbles and force.