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Mold pressurization as a method to reduce warpage in rotational molding of polyethylene
Author(s) -
Chen Chih Hung,
White James L.,
Ohta Yasuhiko
Publication year - 1990
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.760302306
Subject(s) - materials science , mold , composite material , cabin pressurization , polyethylene , shrinkage , molding (decorative) , low density polyethylene , high density polyethylene , stress (linguistics) , philosophy , linguistics
Warpage and global shrinkage of rotationally molded polyethylene parts can be a serious problem with resins of higher densities with rapid quenches and high mold wall thicknesses. It is shown that relatively low pressurization of molds substantially reduces the warpage of molded polyethylene parts. Samples cut out of parts produced in pressurized molds have the same density distributions, Izod Impact, and uniaxial stress‐strain characteristics as parts fabricated in unpressurized molds.