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1、BlackdiscolourationFaultcategoryAlternativetermsCharredstreaks,burnmarks,periodicdiscolouration,darkspotsDescriptionBrowntoblack,irregularandlocallyvariablediscolourationofthemouldedpartPossiblecauses RemedialactionsFaultcategoryAlternativetermsCharredstreaks,burnmarks,period
2、icdiscolouration,darkspotsDescriptionBrowntoblack,irregularandlocallyvariablediscolourationofthemouldedpart Possiblecauses Remedialactions 1. Entrapped,compressedairinthemouldleadingtoscorching Optimisemouldventing,particularlywhereflowfrontsmeetandattheendofflowpaths.Correc
3、tflowfrontprofilebyadjustingsectionthickness,gatelocationorusingflowleaders.Checkventingchannels.Reducemouldlockingforce.EvacuatemouldBlackening]FaultcategoryAlternativetermsDieseleffectDescriptionConcentratedblackeningatweldlines,e.g.nearribsorbosses,orincornersattheendofflo
4、wpaths Possiblecauses Remedialactions 1. Unsuitabledesignofchangesincrosssectionandbendsinthehotrunner,orfaultysealingfacesleadingtodeadspotswherethematerialbecomescharred.Deadspotsoccurringatsealingfaces,changesincrosssectionandbendsinthehotrunner Checkand/orredesigntherele
5、vantcomponentsandsealingsurfaces.Eliminatedeadspots.Checkthepressurereliefholesfortheneedleshut-offmechanism.Inspectsealingfaces.Checkradiiofbendsandconicaltransitionsfromlargetosmalldiameterrunner 2. Wearonthescrew,thenon-returnvalveorthecylinder Checkthescrew,thenon-returnv
6、alveandthecylinderforwearCloudiness]FaultcategoryAlternativetermsGreystreaksDescriptionDark,cloudyareasonpartsurface Possiblecauses Remedialactions 1. Plasticatingunitcontaminated Cleanplasticatingunit.Reducescrewspeed 2. Wearontheplasticatingunit Replacecompleteplasticating
7、unitorindividualcomponents.UseacorrosionandabrasionresistantplasticatingunitColourinconsistencies]FaultcategoryDescriptionColourinconsistencies Possiblecauses Remedialactions 1. Materialnotsufficiently Increasebackpressure,reducescrewspeedhomogenised 2. Injectionandscrewspee
8、dtoohigh Reduceinjectionandscrewspeed 3. Gatetoonarrow Enlargegate 4
