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An experimental investigation of capillary extrudate swell in relation to parison swell behavior in blow molding
Author(s) -
Kalyon Dilhan M.,
Kamal Musa R.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760260709
Subject(s) - die swell , swell , capillary action , blow molding , materials science , composite material , molding (decorative) , extrusion , high density polyethylene , polyethylene , thermodynamics , mold , physics
An experimental study was carried out to study and characterize the capillary extrudate swell and parison swell behavior in extrusion blow molding of two commercial blow molding grade high density polyethylene resins. The capillary extrudate swell behavior of these resins were determined employing a capillary rheometer and a special thermostatting chamber. Parison swell behavior was determined using an Impco A13‐R12 reciprocating screw blow molding machine in conjunction with cinematography and pinch‐off. The experimental conditions under which capillary extrudate and parison swell data can be related are elucidated. Excellent agreement is found between the area swell values determined on the basis of capillary and parison swell experiments.