Shanghai Daoqin Plastics Co., Ltd.

         in nylon in add glass fiber, toughening agent and other filler can significantly increase material force property can. in glass fiber reinforced nylon injection molding process in, “ fiber exposure ” phenomenon 经常出现. fiber exposure 也叫露纤, glass fiber in product surface, comparison coarse 糙. due to glass fiber (GF) outer 露, make type product application to made, main applications high strength structural parts. is use add material cosmetic parts, is light or 蚀纹面(例如 power tools), is add material difficult to appearance.

plastics made parts in “ fiber exposure ” phenomenon

         glass fiber reinforced nylon 出现“ fiber exposure ” phenomenon causes

         fiber exposure formed causes has very more, most main/primary causes is below/following types:

        （1） glass fiber and nylon versus property 差

         due to plastics melt in flow process in to screw, nozzle, runner and gate scratch force function, formed local viscosity 差异, meanwhile also bad glass fiber (GF) surface interface 层, melt viscosity small, interface loss heavy, glass fiber (GF) and resin between adhesion force small, adhesion force small to 一定程 degree 时, glass fiber (GF) 便会摆脱 resin 基体 束缚, toward surface 积累而 outer 露.

        （2） glass fiber and material specific gravity 差异

         in plastics melt flow process in, due to glass fiber (GF) and resin flow property has 差异, but also quality density different, make tool has separation trend, glass fiber (GF) toward surface, resin toward inner 里,于 is formed glass fiber (GF) outer phenomenon.

        （3）喷泉效应

         nylon melt type 模时, formed “喷泉”效应, glass fiber (GF) internal toward outer table/sheet flow, and type surface 接触, due to mold type temperature degree relatively low, quality light cold fast glass fiber (GF) by 瞬间冻结, can and by melt separation 包围, outer 露而形 formed “ fiber exposure ”.

         therefore, “ fiber exposure ” phenomenon formed, not only and plastics material formed and features has 关, but also and molding processing process has 关, has relatively large complex property and 不确定 property.

         glass fiber reinforced nylon 出现“ fiber exposure ” solutions

         in production in, has various used for improvement “ fiber exposure ” phenomenon measures.

        （1） improvement glass fiber (GF) and nylon versus property

         in molding material in add versus property, dispersant and lubricant and other additives, silicon coupling agent, maleic anhydride grafted compatibilizer, acid type lubricant and Domestic or Imported anti glass fiber (GF) outer agent and other, through this additives glass fiber (GF) and resin versus property, improve/increase dispersion versus uniform property, increase interface adhesion strong/high degree, decrease/reduce glass fiber (GF) and resin separation 离, from improvement glass fiber (GF) outer phenomenon. research table/sheet 明, in in add compatibilizer, modified rear material glass fiber (GF) in in versus property relatively add material obvious improve/increase.

modified rear (left) and modified (right)材 material surface fiber exposure 情况

        （2） improvement molding process conditions

        a. increase speed degree

         in increase speed degree rear, glass fiber (GF) and plastics although in speed different, versus for/regarding high speed 射胶而言, this versus for speed degree ratio/proportion small.

        b. rise high mold temperature degree

         this function is most large, increase high mold temperature degree, is is decrease/reduce glass fiber (GF) and mold retardant force, let glass fiber (GF) and plastics speed degree amount small. and let plastics flow in melt amount thick, let table/sheet 皮层尽 amount thin, this good light slip 河岸无 method 留住树枝一样 道理. RHCM就 is utilizing this principle to appearance fiber exposure.

        c. reduce screw amount temperature degree, decrease/reduce solvent amount

         this is let plastics and glass fiber (GF) separation can can property amount reduce, generally for/regarding fiber exposure effect/influence most small, in 实际操 as in 效果不 large. is, this can very good solution 烧焦. this is is increase glass fiber (GF) rear, therefore very easy 堵住排 gas 通道, therefore in most rear very difficult gas, and glass fiber (GF) in high pressure high oxygen gas ring in is very easy 燃烧.

        （3） mold 方面

         will product appearance 面刻意做 formed light or 蚀纹面, decrease/reduce glass fiber (GF) outer 露 视觉 reaction.