Mold pressurization as a method to reduce warpage in rotational molding of polyethylene

✍ Scribed by Chih Hung Chen; James L. White; Yasuhiko Ohta

• Book ID: 104522815
• Publisher: Society for Plastic Engineers
• Year: 1990
• Tongue: English
• Weight: 410 KB
• Volume: 30
• Category: Article
• ISSN: 0032-3888
• DOI: 10.1002/pen.760302306

✦ Synopsis

Abstract

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.