模具培训HOTRNNR

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1、熱澆道的問題似乎發生在三處:1.澆口直徑2.澆口長度3.噴嘴孔徑Problemswithhotrunnerseemstobeinthreeplaces:1.Gatediameter2.Gateland3.Nozzleorificediameter熱澆道的問題所在WhereCausesProblemswithofRunner任何發生在澆口處的發赤或噴流，表示澆口太小。變褐則表示材料過熱而劣解。Anyblushorjettingatthegatemeansthegateistoosmall,andbrowndiscoloration

2、smeanthematerialisbeingdegradedbytoomuchheat.受限的塑流通道RestrictedFlowPath為了保持澆口暢通而格外加熱塑料，加上塑料在射出時通過長澆口時承受的剪切力，有可能造成褐線。Itwasprobablyacombinationofshearthroughthelonglandofthegateduringinjectionandtheextraheatneededtokeepthegatesopenthatarecausingthebrownstreak.褐線BrownStr

3、eak只以噴嘴口徑去配合熱澆道口徑是不對的。首先要將澆道口徑加大，以配合下游塑流通道口徑，然後再加大噴嘴口徑以配合澆道口徑。Itisn’tjustsizingthenozzleorificetomatchtheholeinthehotspruebushing.Firstyoumighthavetoincreasetheholesizeofthespruebushingtomatchtheflowchanneldiameter,thendrillthenozzleouttomatchthespruediameter.受限的塑流通道

4、RestrictedFlowPath理想的澆道襯套設計OptimizedSprueBushingDesign當塑流通道受限於小或長的澆口，成型技術員常將設定溫度調高，以確保型腔充填、保壓無虞。Whentheflowpathisrestrictedbyasmallgatediameteroralonglandlength,youwillusuallyseehigherheatsettingsbeingusedbythemoldingtechnicianstogetthepartstofillandpackout.這樣的作法產生的問

5、題有製品的翹曲，澆口的外觀缺陷和長的成型時間。Theproblemwiththisapproachisthatitusuallycauseswarpageoftheparts,cosmeticdefectsaroundthegatearea,andlongmoldingcycles.受限的塑流通道RestrictedFlowPath如果歧管溫度設定得比料管前區為高，澆口尺寸或許有問題。如果必須將噴嘴溫度設定得特別高，噴嘴口徑或許沒配合上熱澆道口徑。Ifyoufindyouhavetorunthemanifoldheatshigh

6、erthanthefrontzoneofthebarrel,youprobablyhavegatesizingproblems.Ifyouhavetoruntheheatsuponthenozzle,thenozzleorificeprobablyhasn’tbeendrilledouttomatchthehotspruebushingdiameter.受限的塑流通道RestrictedFlowPath如果塑流通道的尺寸正確，料管的前區、噴嘴和加熱歧管的溫度可以設定得一樣；ABS：232C、易流PC：274C。Ifthefl

7、owpathissizedcorrectly,youwillbeabletosettheheatsettingsonthefrontzoneofthebarrel,thenozzle,andtheheatedmanifold,suchas232CacrosstheboardforABSor274Cforeasy-flowPC.受限的塑流通道RestrictedFlowPath易流的PE和PP:壁厚的50%50%ofwallthicknessforeasy-flowPEandPPABS,SAN和壓克力:壁厚的75%75%ofw

8、allthicknessforABS,SAN,andacrylicsPC/acetal/PVC/加玻纖材料和PPO:壁厚的90%90%ofwallthicknessforPC/acetal/PVC/glass-filledmaterialsandPPOs熱澆道模