Solution for general defects of BMC molding

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1、Defects缺陷RootCauses原因Solutions解决方法Partialfilling不完全填充Injectionpressuretoolow射胶压力太低Materialisnotenough料尺太少Holdingpressuretoolow保压太小Lowfluidnessofmaterial原材料的流动性太差Rawmaterialtoohot原材料或模具温度过高，材料已硬化Missingventing排气不良Increasetheinjectionpressure加大射胶压力Increasethe

2、shotsize增加料量Increaseholdingpressureandtime加大保压压力；延长保压时间Increaseheatinginbarrel,coolsprue&mold加高炮筒；冷咀及模具的温度Reducetemperatureinbarrel,coolsprue&mold降低炮筒；冷咀及模具的温度。检查原料是否已硬化Setuptheventingprogram改善模具的排气Damagingduringmoldrelease出模时产品损坏Cookingnofinished产品未完全固化Int

3、ernalstressintheparts产品存在内应力Undercutexistsinthecavity模具有倒扣Increasethecookingtime延长固化时间Reducetheinjectionpressureandholdingpressure减小射胶及保压压力Checkthemold检查模具Thesprueisbroken射咀堵塞Spruenocookenough水口未完全固化，留在射咀里面Badcoolingincoldrunner冷流道系统的冷却不良Unreasonabledesignf

4、orthesprue,nocertainlystepinthefault射咀设计不合理Increasethecookingtimeortemperatureofmould延长固化时间或增加模具温度Checkthecoolingchannelinsidethecoldrunner检查冷流道的冷却水路Checkthespruedesign检查射咀设计Thepartstaysonfixedside产品粘前模Thepartcanstickonthecoldersideofmold通常情况下，产品容易留在温度较低的一边

5、Materialisnotenough不够料Reviewthepart&molddesign重新审查产品结构及模具设计Adjusttemperatureinthemold调整模具温度Increasetheshotsize增加料量Takeconsiderthatwhetherthedoubleejectisneed考虑是否需要两边顶出Thescrewdon’tmovebackorunstablerecharge螺杆无法后退或回料不稳定Toohighbackpressure背压太高Toolowrotationof

6、screw螺杆转速太慢Toolowpressureinstuffer压料的压力太小Rawmaterialhardinstuffer加料筒里面有硬料堵塞Viscosityofrawmaterialistoohigh材料太粘Clearancebetweencheckring&barrelistoosmall止回环与的炮筒之间的间隙过小Checkringbroken止回环爆裂Adjustthebackpressure调整背压Adjustrotationspeed调整螺杆转速Increasethepressurein

7、stuffer加大压料的压力Cleanthestuffer清理料筒ReviewtherawmaterialwithRMsupplier反馈至原材料供应商Doublecheckthediameterofthecheckring&barrel检查止回环与炮筒的内径尺寸Replacethecheckring更换止回环Rawmaterialleakagebetweenmold&nozzle原料在射咀及唧咀之间泄漏Badcontactnozzle/mould射咀及唧咀配合得不好Checkthecentringofnoz

8、zle检查射咀及唧咀的对中性Checktheradiusofnozzle&sprue检查射咀及唧咀的RCheckthepressureofunitinjection检查射台的压紧力Defects缺陷RootCauses原因Solutions解决方法Rawmaterialtoohot原材料太热Backpressuretoohigh背压太高Barreltemperaturetoohigh炮筒温度太高Sp