毛细管流变仪配备挤出胀大单元应用文章 An Experimental Investigation of Capillary ExtrudateSwell in Relation to Parison Swell Behavior inBlow Moldin

An experimental study was carried out to study andcharacterize the capillary e.xtrudate swell and parisonswell behal-ior in extrusion blow molding of two commer-cial blow molding grade high density polyethylene resins.The capiIIa~ extrudate swell behavior of these resins weredetermined employing a capillary rheometer and a specialthermostatting chamber. Parison swell behavior was de-termined using an Impco Al3-R12 reciprocating screwblow molding machine in conjunction with cinematogra-phy and pinch-off. The experimental conditions underwhich capiiiaq extrudate and parison swell data can berelated are elucidated. Excellent agreement is found be-tween the area swell values determined on the basis ofcapillary and parison swell experiments.