Study on the residual wall thickness at dimensional transitions and curved sections in gas-assisted molded circular tubes
Journal
Polymer Engineering and Science
Journal Volume
42
Journal Issue
1
Pages
111-119
Date Issued
2002
Author(s)
Abstract
Abstract Plastic tubes and hollow rods can be fabricated using gas‐assisted injection molding technology with reduced cost. The residual wall thickness around dimensional transitions and curved sections is of great concern. This research investigated the uniformity of the residual wall thickness distribution in circular tubes with dimensional variations and curved sections. It was found that the wall thickness was not uniform near transitions. With the addition of fillets with proper angles around transitions, the uniformity of residual wall could be greatly improved. The residual wall thickness in curved sections was thick around the outer wall and thin around the inner wall. Low melt temperature and high gas pressure were found to reduce the deviation in the wall thickness around curved sections.
SDGs
Type
journal article