PET吹瓶介绍PPT课件

.,1,PET簡介,I.CKuo2002/12/11,.,2,分子量192*n+62n为聚合度，一般为100160,聚酯的性质,.,3,结构式,HOCH2CH2OOC,OCH2CH2OOC,CO,CO,n-1,OCH2CH2OH,.,4,聚对苯二甲酸乙二酯,英文名称,中文名称,Polyethyleneterephthalate,简称,PET,.,5,玻璃化温度Tg,无定形67结晶81高顺向（取向态）结晶125,.,6,熔点Tm,般240265纯结晶271,.,7,密度g/cm3无定形1.334结晶1.455熔体2701.2202951.117,.,8,吸水率,温度25,相对湿度65%一星期含水0.4%温度25,浸水中一星期含水0.50.8%,.,9,折射率,22.48251.64,.,10,干燥不良对制品的影响,IV下降强度下降、破裂黄颗未熔物气泡白雾拉丝,.,11,PETCHIPS干燥,风温（进口、出口、冷却后）风量露点干燥时间死角均匀性漏气,.,12,桶槽堆积密度860Kg/m3,冷却,过滤,风机,加热,分子筛,分子筛,加热,TI,TI,D.P,FI,除湿,PET干燥图,.,13,PET注塑成型瓶胚成型的过程加料熔融射出保压冷却成型,.,14,Core,Hopper,Preform,Cavity,Screw,Nozzle,barrel,.,15,挤出机,.,16,挤出机螺杆,.,17,.,18,瓶胚注射,.,19,Co-InjectionProcessOptimization,BARRIERLAYERVELOCITYPROFILE,Cavity,Core,.,20,WhatDoConvertersWant?,OperatingefficiencyequaltomonolayerCycletimeequaltomonolayerMachinesizeandmoldsizeequaltomonolayerEaseofoperationandprocesscontrolEconomicaluseofbarriermaterialsaslowas2%UniformdistributionaroundleadingedgeofbarrierPreformswithBarrierPCRPCRandbarrier,2002/11/12,.,21,WhatisMulti-Layer?,MonolayerPETBottle,MultilayerPETBottle,Shortshelflife,Extendedshelflife,ThreeLayers,PETBarrierPET,OneLayer,PETOnly,MULTI-LAYER2Material,3Layers,.,22,TurnkeyPETCo-InjectionSystems,.,23,OtherTechnology,3-LAYERFLOW,.,24,OtherTechnology,3-LAYERFLOW,.,25,OtherTechnology,3-LAYERFLOW,.,26,OtherTechnology,3-LAYERFLOW,.,27,KortecTechnology,3-LAYERFLOW,.,28,KortecTechnology,3-LAYERFLOW,.,29,KortecTechnology,3-LAYERFLOW,.,30,KortecTechnology,3-LAYERFLOW,.,31,SIMPLEBARRIERLAYERADJUSTMENTS,SimultaneousinjectionThreeparametersadjustbarrierlayerdistribution1.)Leadingedge2.)Trailingedge3.)Layerthickness,Co-InjectionProcessOptimization,.,32,KORTECOTHER,CombinelayersremotefromgateStandardmoldsizeStandardmachinesize,CombinelayersclosetocavityNon-standardmoldsizeNon-standardmachinesize,NozzleTechnology,.,33,Three-LayerInjectionProfile,TIMEPOSITION“A”,InjectPETonly,A,.,34,SimultaneouslyinjectPET&barrier,TIMEPOSITION“B”,B,Three-LayerInjectionProfile,.,35,CompleteinjectionofbarrierContinuePETinjection,TIMEPOSITION“C”,C,Three-LayerInjectionProfile,.,36,TIMEPOSITION“D”,D,FinishPETinjectionensuringgateissealedwithPETonlyandnozzleiscompletelypurgedReadyfornextshot,Three-LayerInjectionProfile,.,37,.,38,.,39,如何减少应力,熔体温度模具温度注塑压力保压压力瓶子瓶胚设计测试方法：双折光法,.,40,如何减少白化(料口),原料干燥背压转速熔融温度模具设计、温度冷却速率料门开关,.,41,注塑速率与压力之关系,注塑速率,压力损失,料流长度,收缩率,充模压力,因,素,.,42,温度的设定,T290280EX1EX6N/A,TRANSFERBACK,N/A,M,BH,BHE,EX1,EX3,EX2,EX4,EX5,EX6,DIS,SPH,SCREW,BARREL,SP2,SP1,.,43,一步法与二步法的比较,在一台机内完成注、拉、吹工序的工艺叫一步法。一步法是在瓶坯注塑后冷却后做拉吹动作。省电生产率高不经人手减少污染,.,44,两步法将注及拉吹分离，在两台机器上分时进行。第一步用注塑机注出瓶坯。第二步将室温的瓶坯再加热后，拉吹成为瓶子，,购买瓶坯吹塑成型。可以减少投资（人材及设备）。瓶坯的体积远小于瓶子，方便运输及储存。淡季生产的瓶坯可在旺季吹成瓶子。,.,45,250,200,150,50,100,RT,300,Cooling,Cooling,Bottle,Preform,PETChips,GlassTemp,A,Reheat,StretchBlowRange,PETdryingInhopper,PETMeltinginbarrel,RT=Roomtemp,MT=MeltingTemp,B,Injection,.,46,比较,内外温差比较厚度差异瓶胚设计限制个别注塑速率差异造成厚薄不均,稳定性差,.,47,AA的产生,原料（FreeAA、PotentialAA)干燥(Airflow,Temp,Staytime)注塑条件(Temp,Press,Speed,Staytime,ChipsTemp)注塑设备(Screw,Hotruner,Model,MeltTemp),.,48,IV下降,强度抗张强度(摔落易破)色泽变异,.,49,厚薄不均,瓶胚设计瓶子设计IV下降吹瓶温度(一步法,二步法)吹气时间与延伸之关系PET延伸倍率