PVC plastic extrusion mold

extrusion mold For the window profile mould,we have frame,sash,door sash ,glazing moulds and so on.Then we have 80,60,88 sliding series,60,65 swing series.We often use A3l,45#,3Cr17,3Cr13 stainless steel.If you have special requirement,you can tell us.And our products are authorized by the Quality Management System Certificate for ISO9001:2000.Common finished product defects analysisProduct defectsPossible reasonsHandling methodsExtrusion mould distortionToo short cooling time, not enough cooling for finished productsdelay the cooling timeToo rapid speed for extrusion, forced pull to lead the distortionSlow down the speed of extrusion dieFinished product structure with defectsModify the diesToo high temperature for die, poor cooling for finished productsreduce the mould temperatureKnit lineInsufficient injection pressure, too slow injection speed, too small gate and flowing pipeIncrease the injection pressure and injection speed, modify the gate and flowing pipe.Too low forming temperature and mould temperatureIncrease temperature, increase back pressure or accelerate the rotating speed of screwInsufficient exhaust in interflow zone and no run-off pitFix exhausting holes in interflow zone and increase the number of run-off pits.Use too much release agentReduce to use release agentPoor luster of finished productsToo slow injection speed, insufficient pressure and low mould temperatureIncrease the injection speed, injection pressure and mould temperatureHydrosphere or grease pollution in the mould cavityClean it upPoor grinding of mould surface or too small gate and flowing pipeModify mouldInsufficient injection quantity or water contained in the raw materialIncrease the injection pressure and injection speed, delay the jettiCracks of extrusion mould of finished productsToo low temperature of material or mouldIncrease the temperatureInsufficient stripping lean or improper extrusion wayModify the mouldToo small gateModify the mouldInsufficient stripping angleModify the mouldCoarse surface of extruded finished products Too low forming temperatureIncrease the temperature, accelerate the rotating speed of screwToo low mould temperatureIncrease the mould temperatureSurface blocks of extruded finished productsNot clean material pipes, contain wastesClean up material pipeThe additive articles such as color master batch are not done according to the requirementslook for the corresponding color master batchInsufficient extrusion quantity Insufficient temperature for material pipeIncrease the temperatureWastes in the gate or too low speed rate of screwClean up the gate or accelerate the rotating spped of screwExtrusion mould expansion of extruded productsToo low temperature of mould head or too fast rotating speed of screwIncrease the mould head temperature and reduce the rotating speed of screwToo fast limited materialAdjust the limited material deviceProduce much gas when extrudingToo high melting temperatureReduce the melting temperatureWastes in the material pipeClean up the material pipePits of extruded productsWater contained in the raw materialDry the materialToo high meting temperature, too fast rotating speed of screwReduce the meting temperature, and the rotating speed of screw