Shanghai Daoqin Plastics Co., Ltd.

products very large separation is due to internal stress formed. formed products causes very more, main/primary has: equipment 方面 （1） machine inner has or material, easy promote material degradation. （2） machine 塑化容 amount small, plastics in machine inner 塑化不充 separation; machine 塑化容 amount large, plastics in machine inner hot and 受剪切 function time long, plastics easy aging, make products 变脆. （3） ejection plant/unit or balanced, dry 截面积 small or distribution 不当. 二 injection molding parts mold 方面 （1） gate small, 应考虑 adjustment gate dimensions or increase 设辅助 gate. （2） separation runner small or 配置不当, amount balanced combined or increase separation runner dimensions. （3） injection molding parts mold structure defect formed injection molding parts cycle 反常. process 方面 （1） machine 筒, nozzle temperature degree low, high it. if material material easy degradation, improve/increase machine 筒, nozzle temperature degree. （2） reduce screw back pressure pressure and speed, make material is hydrophobic 松, decrease/reduce plastics 因剪切 hot formed degradation. （3） mold temperature high, demolding difficult; mold temperature low, plastics cooling, 熔接缝 melt combined defect, easy cracking, especially is high melting point plastics polycarbonate (PC) and other more is 如此. （4） type type need has demolding degree. type difficult demolding 时, need improve/increase type temperature degree, shrink short cooling time; type difficult 脱时, need reduce type temperature degree, long cooling time. （5）尽 amount less use metal parts, polystyrene (PS) this category of property cold hot ratio large plastics, more can add parts injection molding parts. raw materials 方面 （1） raw materials mixed has its it or 掺杂 不适当 or amount solvent agent or its it additives 时. （2） has plastics 如ABS and other, in 受潮状况 lower add hot and water 汽发生 catalytic reaction, make made parts large 应变. （3） plastics recycled 次数太 more or recycled material content high, or in machine inner add hot time long, 都会促 make made parts 脆裂. （4） plastics quality 不佳, molecular weight distribution large, has rigid property separation and other non-uniform structure formed separation has amount large; or its it plastics 掺杂污染, defect additives 污染, 灰尘杂质污染 and other is formed causes. products design 方面 （1） products belt/tape has easy 出现应 force cracking 尖角, or thick degree versus very large 部位. （2） products design thin or 镂空太 more.