塑胶件常见缺陷及改善对策

Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,VT-PL/PE,*,how to do?,11/27/2024,1,VT-PL/PE,缺陷：夹水纹 Defect:weld lines,夹水纹,11/27/2024,2,VT-PL/PE,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,11/27/2024,3,VT-PL/PE,缺陷：气纹 Defect:air lines,气纹,11/27/2024,4,VT-PL/PE,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,11/27/2024,5,VT-PL/PE,缺陷：气花 Defect:air streaks,气花,11/27/2024,6,VT-PL/PE,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,11/27/2024,7,VT-PL/PE,缺陷：皱纹 Defect:record grooves effect,皱纹,11/27/2024,8,VT-PL/PE,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,11/27/2024,9,VT-PL/PE,缺陷：混色 Defect:color streaks,混色,11/27/2024,10,VT-PL/PE,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,11/27/2024,11,VT-PL/PE,缺陷：缩水 Defect:sink m ark,缩水,11/27/2024,12,VT-PL/PE,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,11/27/2024,13,VT-PL/PE,缺陷：顶白 Defect:visible ejector m arks,顶白,11/27/2024,14,VT-PL/PE,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,11/27/2024,15,VT-PL/PE,缺陷：烧焦 Defect:Diesel effect,烧焦,11/27/2024,16,VT-PL/PE,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(entrapped air),11/27/2024,17,VT-PL/PE,缺陷:走胶 Defect:incom pletely filled parts,走胶,11/27/2024,18,VT-PL/PE,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,11/27/2024,19,VT-PL/PE,缺陷：披锋 Defect:flash,披锋,11/27/2024,20,VT-PL/PE,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,11/27/2024,21,VT-PL/PE,缺陷：变形 Defect:deform ation,变形,11/27/2024,22,VT-PL/PE,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,11/27/2024,23,VT-PL/PE,缺陷：蛇纹 Defect:Jetting,蛇纹,gate,11/27/2024,24,VT-PL/PE,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),11/27/2024,25,VT-PL/PE,缺陷：真空泡 Defect:Vacuum vesicle,真空泡,11/27/2024,26,VT-PL/PE,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,11/27/2024,27,VT-PL/PE,缺陷：白线 Defect:W hite lines,白线,11/27/2024,28,VT-PL/PE,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,11/27/2024,29,VT-PL/PE,缺陷：拖白 Defect:Dragging-w hitening,拖白,11/27/2024,30,VT-PL/PE,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,11/27/2024,31,VT-PL/PE,缺陷：拉白 Defect:Pulling-whitening,拉白,11/27/2024,32,VT-PL/PE,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,11/27/2024,33,VT-PL/PE,缺陷：起皮 Defect:Flaking of surface layer,起皮,11/27/2024,34,VT-PL/PE,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,11/27/2024,35,VT-PL/PE,缺陷：黑点 Defect:Dark spots,黑点,11/27/2024,36,VT-PL/PE,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,11/27/2024,37,VT-PL/PE,缺陷：光泽不一 Defect:G loss differences,光泽不一,11/27/2024,38,VT-PL/PE,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.均匀模腔表面温度,11/27/2024,39,VT-PL/PE,缺陷：表面斑点 Defect:Spots on surface,表面斑点,11/27/2024,40,VT-PL/PE,表面斑点改善对策,工艺:,1.提高注射速度及注射压力,2.增加螺杆转速,3.增加背压,4.提高料筒温度,模具:,1.提高模腔表面温度,11/27/2024,41,VT-PL/PE,