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1、Thisarticleiscontributedbycheqianzi718DOCdocumentsmayexperiencepoorbrowsingontheWAPside・ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.Theeleventhchapteristheanalysisandsolutionofthedefectsofthethermoplasticproducts1111~1,evaluatethequalityofplasticproductsthreeindicato
2、rs1.appearancequalityincludingintegrity,colorandluster;andtherelativepositionof2.dimensions:meettheproductdrawingsandassemblyrequirements;mechanicalproperties,chemicalpropertiesanduses3.related:suchastensiletesting,impacttesting,environmentaltesting.11-causesdefectsintheproduct:11~2causesofdefects
3、intheproduct:1.plasticproblems:includingplasticqualityingredientsanddryingmachine;2.problems:includinginjectionpressure,temperatureandcycle;3.problems:includingmolddesign,moldinanufacturingandmoldwear・Theproblemisoneofthemostcommonandmostdifficultproblems.Ill1~3productscommondefectsanalysisandsolu
4、tions1.fallinginadequate(beerdissatisfaction,short,shot):inadequatefilling(beerdissatisfaction)Thebeerplasticincomplete,ormulticavityindividualcavitybeerdissatisfaction.（1）thefeedregulationisimproper,lackofmaterialormaterial;（2）injectionpressure,temperatureandtime;（3）thematerialtemperatureisnoteno
5、ugh;（4）themolddesignisnotreasonable:thepassageistoolong,turningover;theexhaustsystemisnotgood;flowquenchwellenough;thenumberofmulticavitymoldcavitytoomuch,qualifyingwrong,gatelocation,formornot・Thewatershortageofdesignisnotreasonable・2.,flyingedge（phi,flash2.,flyingedge（phi,flash）:Flyingedge塑料制品边缘
6、，镶件接合处及顶针位出现多余薄翅.（1）模具制造精度差；（2）模具设计不合理：一排位不合理，压力不平衡；一浇口位置不当，造成一边缺料，一边出披锋；一行位的锁紧力不够.一模具排气不良，在高压下分型面被撑开等.（3）啤机锁模力不够；（4）调机不当:压力过大，温度过高及加料量过大等.银纹（俗称水花，streak）:3•银纹（俗称水花,silverstreak）:表面气泡拉破•当塑料内充满过多水汽，分解气，溶剂气及空气时，制品表面沿料流方向形成一连串有银色光泽的如针条状或云母片状斑纹.（1）水汽.（2）分解气:料温高，塑料质量差以及剪切力过大.（3）塑料不纯•收缩凹陷（缩水，4,收Shrinkag
7、edepression（shrink,sinkmark）:theplasticsurfaceduetointernalshrinkageandproducepits・Mainreasonsarethepressureofbad,unevencooling,wallthicknessorbonewidthistoolarge,insertwithoutpreheating・Solution:（1）thewallthickn
