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Confined parison inflation behavior of a high‐density polyethylene
Author(s) -
Dutta A.,
Ryan M. E.
Publication year - 1984
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.760241604
Subject(s) - high density polyethylene , inflation (cosmology) , materials science , mold , polyethylene , distribution (mathematics) , mechanics , power law , power (physics) , extrusion , simple (philosophy) , thermodynamics , statistical physics , composite material , mathematical analysis , mathematics , theoretical physics , physics , statistics , philosophy , epistemology
An analysis of the confined parison inflation step associated with the extrusion blowmolding of a high‐density polyethylene is presented. Based upon simple geometrical considerations and material conservation principles, relationships describing the wall thickness variation have been obtained for various mold configurations. The experimentally measured part thickness distribution is found to be in good qualitative agreement and reasonable quantitative correspondence with the theoretical predictions. Furthermore, the expressions for the thickness variation have been utilized in order to estimate the confined inflation time for the case of a power‐law constitutive equation. In addition, a brief discussion of some practical mold design considerations is given based upon the theoretical analysis.