Shanghai Daoqin Plastics Co., Ltd.

in 进行 injection molding processing 时, due to plastics in mold cavity in non-uniform cooling and non-uniform shrinkage and injection molding parts structure design combined 理, easy product various defect:
　　 shrink 印, 熔接痕, gas 孔, deformation, 拉毛, 顶伤, flash.
　　 is to high quality injection molding product, 我们必 must in design product separation its structure process property, lower combined injection molding product main/primary structure features analysis injection molding defect methods.
　　1 mold opening direction and separation type 线
　　每 injection molding product in design 时首先 need its mold opening direction and separation type 线, ensure can can decrease/reduce machine and remove separation type for appearance effect/influence.
　　1.1 mold opening direction rear, product add strong/high 筋, 卡扣, and other structure can can design formed and mold opening direction 一致, 以避免抽芯 decrease/reduce 拼缝线, long mold lifespan.
　　1.2 例如: 保险杠 mold opening direction generally is 车身坐标χ direction, if mold opening direction design formed and χ轴不一致, must in product in its 夹角.
　　1.3 mold opening direction rear, can selection separation type 线, improvement appearance and property can.
　　2 demolding degree
　　1 适当 demolding degree can product 拉毛. light slip surface demolding degree large 于0.5 degree, fine surface large 于1 degree, coarse surface large 于1.5 degree.
　　2 适当 demolding degree can product 顶伤.
　　3 deep structure product design outer surface degree requirements small inner surface degree, ensure injection molding mold type 芯不偏位, to uniform product thick, ensure product 开口部位 材 material density strong/high degree.
　　3 product thick
　　3.1 various plastics has 一定 壁 thick scope/range, generally 0.5～4mm, thick ultra- 4mm时, will cooling time long, generate shrink and other issues, 应考虑改变 product structure.
　　3.2 壁 thick 不均会引起 surface shrink 印.
　　3.3 壁 thick 不均会引起 gas and 熔接痕.
　　4 add strong/high 筋
　　4.1 add strong/high combined application, can increase product rigid property, decrease/reduce deformation.
　　4.2 add strong/high thick degree must small product thick 1/3, 否则引起 surface shrink 印.