1、Blow Molding,MFG 355,Extrusion Blow Molding,Basic Blow Molding Extrusion Head,Circular Blow Molding Machine,Extrusion Blow Molding,Parison,Mold Open,Mold Closed,Pressurization of Parison,Cooled Part,Mold Open,Extrusion Blow Molding,Click frame to start video,Injection Blow Molding,Click frame to sta
2、rt video,Injection Blow Molding,Preform is injection moldedPreform is placed in the blow molding machinePreform is heatedPreform is pressurizedPart is removed,PET Preform,Molds and Dies,General die and mold considerations（for injecting the preforms）Tool steelMulticavity,Preform Formation,Material pl
3、acementStretch optimization,General Mold Considerations（for the mold in which the part is blown）,Blow molding is lower pressure that injection moldingBlow molding molds dont have the strength requirementsAluminum molds are most commonMachined or castVentingSymmetry,Preforms Placed in Mold,Formed Bot
4、tles,Other Blow Molded Parts,Photo Courtesy of Phillips Petroleum Company,Plant Concepts,No extensive cooling neededScrap removal and handling important,Material Considerations,Most thermoplastics can be blow molded（in theory）High melt strength is necessaryPolyolefins are the easiest to processPVC i
5、s temperature sensitiveSome materials require Coblow-Molding,Shapes,Basically hollowTypically of a cubic or cylindrical shapeBottles,barrels,tanks,ducts,trash carts,flower pots,double wall cases（for tools）,and toysCare must be taken to not have corners that are too thinThreads for caps are typically not of the highest toleranceHandles can be made using pinch points in the mold,Shapes,Thank You,
