Shanghai Daoqin Plastics Co., Ltd.

this type of molding process is is molding optical 透镜面 development. its molding process is: injection molding parts mold clamping, 但动模, 定模不完 full combined 而保留一定 pressure shrink 间隙, rear toward type inner injection melt; melt injection rear, 由专设 闭模 active 塞实施二交 clamping, in injection molding parts mold full combined process in, type in melt again one-time flow pressure 实. and generally injection molding parts molding versus ratio, injection - pressure shrink molding features is: 1） melt injection is in mold cavity full combined lower 进行, runner large, flow retardant force small, injection molding parts pressure small. 2） melt shrinkage is through external add pressure to mold cavity make mold cavity dimensions small （ mold cavity pressure shrink melt ） 补偿, type formed pressure distribution uniform. therefore, injection - pressure shrink molding can decrease/reduce or remove 由充填 and holding pressure generate separation orientation and internal stress, improve/increase products uniform property and products dimensional stability, meanwhile reduce plastics parts residual stress. injection - pressure shrink molding process already used for molding plastics optical 透镜. light sheet/slice and other high degree plastics parts and difficult injection molding parts molding thin plastics parts. in addition injection pressure shrink molding in glass fiber reinforcement resin molding in application day 益普