Shanghai Daoqin Plastics Co., Ltd.

         short 射

         short 射 指 is due to mold by full 充满而导致 injection shot product 不完整 情况.

         this type of defect usually in gate most 远 点 upper, or 者出现 in need through mold upper narrow 部位才 can to 达 部 separation, is narrow separation has can can retardant melt flow.

         short has can can formed very micro small 斑痕, has can can obvious formed product relatively large separation 缺失.

         causes:

         can can formed short causes has:

        射入 mold raw materials 不足

        熔流 retardant force large, make its method to mold 各处

         mold gas defect formed gas 穴, gas retardant melt, make its method to mold 一 部位.

         flash

         flash is from in extrusion more raw materials viscous in product upper formed.

        此 defect 会出现 in product upper, or mold 各 组 formed separation between. raw materials can can separation type from mold in 溢出, also can can from 动静模 接 combined 处溢出.

         flash also has can can in type 芯处, this can can is due to liquid pressure or belt/tape 角 销子造 formed.

         flash issues heavy degree different, has relatively thin, heavy can can comparison thick.

         causes:

         can can formed flash causes has:

         mold 锁模面 loss bad or abrasion loss heavy

        动静模 versus 锁时错位

         mold inner raw materials pressure large clamping force

         upper to types 情况也会由 very more different causes formed. in lower 列情况 in, raw materials pressure can can large clamping force:

         in injection molding stage/phase (充模 stage/phase)注入 more raw materials, increase mold inner pressure

         in process in retardant force large increase mold inner pressure

         in holding pressure stage/phase mold cavity pressure high

         clamping force 不够

         degradation

        由 degradation formed 结果由 very multiple, issues degree and heavy property same. most heavy can can formed product full color, and formed its mechanical properties defect. local degradation 仅仅会造 formed dark strip/profile or 斑点.

         causes:

         degradation is due to raw materials bad 引起. formed plastics long separation in degree hot or large 剪切应 force function lower 会发生 separation understanding. separation separation understanding process types generate property gas can accelerated degradation process, this 就会造 formed raw materials color. a large amount of separation separation understanding most bad raw materials formed separation, for its mechanical properties formed defect effect/influence.