注塑常见问题及对策

2020/6/8,VT-PL/PE,1,VT-PL塑胶件常见缺陷及改善对策,2020/6/8,VT-PL/PE,2,howtodo?,2020/6/8,VT-PL/PE,3,缺陷：夹水纹Defect:weldlines,夹水纹,2020/6/8,VT-PL/PE,4,工艺:1.提高注射速度2.增加炮筒温度3.增加保压压力模具:1.提高模温2.增大浇口及流道截面积3.改善模具的排气,夹水纹改善对策,2020/6/8,VT-PL/PE,5,缺陷：气纹Defect:airlines,气纹,2020/6/8,VT-PL/PE,6,气纹改善对策,工艺:1.降低注射速度2.增加料筒温度模具:1.增大浇口截面积2.提高模腔表面温度3.加深冷料井,2020/6/8,VT-PL/PE,7,缺陷：气花Defect:airstreaks,气花,2020/6/8,VT-PL/PE,8,气花改善对策,工艺:1.降低注射速度2.充分干燥原料3.增加料筒温度4.提高背压5.减少抽胶行程模具:1.增大浇口及流道的截面积2.提高模腔表面温度,2020/6/8,VT-PL/PE,9,缺陷：皱纹Defect:recordgrooveseffect,皱纹,2020/6/8,VT-PL/PE,10,皱纹改善对策,工艺1.提高注射速度2.提高注射压力及保压压力3.提高料筒温度模具1.增大浇口及流道截面积2.提高模腔表面温度,2020/6/8,VT-PL/PE,11,缺陷：混色Defect:colorstreaks,混色,2020/6/8,VT-PL/PE,12,混色改善对策,工艺1.提高背压2.降低螺杆转速,以增加混炼时间3.提高料筒温度4.增加残量机器1.选用混炼型喷嘴2.选用BM螺杆,2020/6/8,VT-PL/PE,13,缺陷：缩水Defect:sinkmark,缩水,2020/6/8,VT-PL/PE,14,缩水改善对策,工艺:1.提高注射速度及注射压力2.提高保压压力及保压时间3.提高料筒温度4.提高背压5.延长冷却时间模具:1.增大浇口及流道截面积2.降低模腔表面温度3.改善模具排气,2020/6/8,VT-PL/PE,15,缺陷：顶白Defect:visibleejectormarks,顶白,2020/6/8,VT-PL/PE,16,顶白改善对策,工艺:1.降低保压压力及保压时间2.降低顶针压力及顶出速度3.延长冷却时间模具:1.降低模腔表面温度2.检查修复模具的倒扣(undercut)3.加大顶针的截面积及改善顶针布置,2020/6/8,VT-PL/PE,17,缺陷：烧焦Defect:Dieseleffect,烧焦,2020/6/8,VT-PL/PE,18,烧焦改善对策,工艺:1.降低注射速度及注射压力2.降低料筒温度3.降低锁模力模具:1.改善模具排气2.防止包气(entrappedair),2020/6/8,VT-PL/PE,19,缺陷:走胶Defect:incompletelyfilledparts,走胶,2020/6/8,VT-PL/PE,20,走胶改善对策,工艺:1.提高注射速度及注射压力2.提高保压压力及保压时间3.提高料筒温度4.提高背压模具:1.增大浇口及流道截面积2.提高模腔表面温度3.改善模具排气,2020/6/8,VT-PL/PE,21,缺陷：披锋Defect:flash,披锋,2020/6/8,VT-PL/PE,22,披锋改善对策,工艺:1.降低注射速度及注射压力2.降低保压压力及保压时间3.降低背压4.降低料筒温度.5.增加锁模力模具1.降低浇口及流道截面积2.降低模腔表面温度3.减少排气槽截面积,2020/6/8,VT-PL/PE,23,缺陷：变形Defect:deformation,变形,2020/6/8,VT-PL/PE,24,变形改善对策,工艺:1.降低保压压力及保压时间2.降低背压3.延长冷却时间模具:1.增加浇口截面积2.均匀模腔表面温度,2020/6/8,VT-PL/PE,25,缺陷：蛇纹Defect:Jetting,蛇纹,gate,2020/6/8,VT-PL/PE,26,蛇纹改善对策,工艺:1.降低注射速度2.提高炮筒温度模具:1.加大浇口截面积2.移动浇口位置(采用冲击型浇口),2020/6/8,VT-PL/PE,27,缺陷：真空泡Defect:Vacuumvesicle,真空泡,2020/6/8,VT-PL/PE,28,真空泡改善对策,工艺:1.降低注射速度2.增加保压压力及保压时间3.增加背压4.降低料筒温度模具:1.增加浇口截面积2.提高模腔表面温度,2020/6/8,VT-PL/PE,29,缺陷：白线Defect:Whitelines,白线,2020/6/8,VT-PL/PE,30,白线改善对策,工艺:1.增加锁模力2.降低保压压力及减少保压时间4.降低注射速度及注射压力4.提高料筒温度模具:1.提高模腔表面温度,2020/6/8,VT-PL/PE,31,缺陷：拖白Defect:Dragging-whitening,拖白,2020/6/8,VT-PL/PE,32,拖白改善对策,工艺:1.降低保压压力及保压时间2.降低注射速度及注射压力模具:1.幼化模腔蚀纹2.加大出模斜度,2020/6/8,VT-PL/PE,33,缺陷：拉白Defect:Pulling-whitening,拉白,2020/6/8,VT-PL/PE,34,拉白改善对策,工艺:1.降低保压压力及保压时间2.降低注射速度及注射压力3.延长冷却时间4.降低顶出速度及顶出压力模具:1.加出模斜度2.省顺骨位,2020/6/8,VT-PL/PE,35,缺陷：起皮Defect:Flakingofsurfacelayer,起皮,2020/6/8,VT-PL/PE,36,起皮改善对策,工艺:1.降低注射速度2.充分干燥原料3.降低料筒温度原料:1.检查原料是否混有杂料模具:1.提高模腔表面温度,2020/6/8,VT-PL/PE,37,缺陷：黑点Defect:Darkspots,黑点,2020/6/8,VT-PL/PE,38,黑点改善对策,工艺:1.降低料筒温度2.降低背压3.降低螺杆转速4.减少残量原料:1.检查原料是否混有杂料,2020/6/8,VT-PL/PE,39,缺陷：光泽不一Defect:Glossdifferences,光泽不一,2020/6/8,VT-PL/PE,40,光泽不一改善对策,工艺:1.提高注射速度及注射压力2.提高保压压力及保压时间3.提高料筒温度模具:1.均匀模