Shanghai Daoqin Plastics Co., Ltd.

         polymer in plastics extrusion or injection molding 时, in 流体剪切 speed rate relatively low 时经口模 or gate extrusion material tool lubricated and 平均 形状. 当剪切 speed rate or 剪切应 modified plastics force increase to value 时, in extrusion material outer table/sheet 取 鲜丽且 outer 面邃密精美;当 plastics extrusion speed degree again high 时, extrusion material surface will 呈现浩繁 不划定规矩 结节, understanding or 竹节纹, 以至支离 and fracture formed sheet/slice or 柱段, 我们称之 is ” melt 破碎”.

         this phenomenon 说明, in low 剪切应 force or speed degree lower, various formed separation small by melt made;而 in high 剪切应 force or speed rate lower, in difficult pressure 抑, 并进行 formed 不不乱运动;当抵达一 临界剪切 force 时, will 引起流体 决裂.

        1, material 方面

         high lower 流体 决裂导致 manufacturing product peeling phenomenon, 以PC/ABS raw materials is 例, PC, ABS versus machine 关, in high lower add easy 发生流体 盘据 and versus separation 离, 继而发生 delamination peeling gas 象. for/regarding PC/ABS raw materials 说, PC and ABS两组 modified plastics between is small separation versus 容, therefore in modified process in can add 入一定 amount compatibilizer improve/increase its versus property. 当然, due to mixed material formed peeling defect is demand 第一步 破 remove.

图 plastics peeling

        2, mold design 方面

         mold design 原则需遵循 decrease/reduce 剪切 目 进行. 密集皮纹面 product more add easy generate peeling phenomenon (high speed filling melt in type inner and type inner high force 致); meanwhile gate design upper, gate dimensions small, will generate melt through gate generate high force, 继而导致 product surface peeling. mold design from amount decrease/reduce direction 进行.

图 plastics delamination peeling

        3, injection molding process 　

         high speed high pressure 会导致 melt in gate generate degree force, meanwhile melt and type inner 壁 剪切 and melt and between 剪切也会急剧添 add; in addition, injection molding temperature degree / mold temperature degree low, reduce melt flow property, filling process in flow retardant force add large, high force generate. therefore, reduce injection speed degree, injection pressure, injection molding temperature degree / mold temperature degree can has reduce force, decrease/reduce or peeling generate. amount filling process in high force, is improvement injection molding peeling phenomenon most 佳切入点.

        网友A: material mixed 入 杂 material, easy delamination peeling.

         other causes: molding use more demolding agent; water separation more; resin temperature degree 不一致 and other.