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1、注塑常见问题处理（Treatmentofcommonproblemsininjectionmolding）1,blackandbrownspots.Description:moldedpartshavetherighttone,butoccasionallyvisiblespotsorstripes.Possiblecause:proposedremedy:Injectionmoldingmachine:A,thelastoperationofthedegradationofplasticinthescrewscrew,aproncured.-usecleaningmixtureorhighm
2、olecularweightsubmaterialtocleanthematerial.B"plastic"istrappedinthe"angle"or"nonflowing"zoneoftheejectiondevicesothatitstaystoolongathightemperature.-thebarrelandscrewdownthoroughlycleanthesurfaceincontactwithmoltenpolymers;checkthenozzleisproperlylocatedinsidethebarrel;withopenorstraightnozzletype
3、insteadofopeningandclosingthenozzle;checkwhetherthedamagedrubberhead.C,theplasticentersthemoldcavitytooquickly,causingexcessiveshearassemblies.--reducinginjectionspeed.D,melttemperatureistoohigh.-reducethebarreltemperature;checkthecoolingdevicebodyflowvelocityonthehopperatresiaisenough,ifthereisanee
4、dtoadjusttheflowrate;reducethecycletimetoincreaseaftertheplasticmaterialinjectiondevice.Ecausesexcessiveshearingofmoltenplasticsusingincorrectsurfacevelocityandbackpressureofthescrew.-useminimumbackpressureandcorrectscrewsurfacespeedMould:TheretracesofoilandoilA,mold.-willdie,especiallythesprueremov
5、edandcleanedup.B,gateistoolittle.---increasesthesizeofthegate.C,thethicknessoftheinjectionmoldingistoothintoallowtheplastictoflowsufficientlywithoutdegradation-checktheaccuracyandconsistencyofthewallthickness.Theimpurity-willremoveheatJackTsuicleantheD,hotrunnermoldPlastic：A,PVCorotherheatsensitivep
6、lasticimpurity-checkthesourcesofimpurities,especiallywithPVC,responsibleforpipelineplasticparts.B,usedbeforeC,theheatrecoverymaterial-separatesthematerialfromthefeedandchecksitcarefullyD,theroomcleanand/orinsufficientdryingandmakeplasticmixedcombustionparticles-cleaningdryingpartorRegrindEandplastic
7、lubricationleadtopoorplasticflowcharacteristics-increasingtheamountofexternallubricant(e.g.,0increase).05%to0.1%zincstearate2,blackbrownstripe(causeandremedymethod,pleasereferto"blackspot,brownspot")D
