Title:
PROCESSES FOR MOLDING A CART
Document Type and Number:
WIPO Patent Application WO2002078925
Kind Code:
A9
Abstract:
A method of molding components (14) of a shopping cart (10) using high or low pressure molding processes. The molding processes eliminate sink marks in plastic components of the shopping cart while providing structural integrity thereto. The processes used to mold the components of the shopping cart can create either or both a center channel in the molded components and/or a plurality of voids within the molded components. If hollow channels are formed in the molded components, then the plurality of voids will be formed in the walls of each molded component if both processes are used together. The processes used to form the molded components are either (I) a gas assist process which provides a laminar stream of blowing agent into the stream of molten resin after the molten resin is forced into a partially filled mold or (II) a structural foam molding process which provides a blowing agent blended into the molten resin prior to the molten resin being forced into the mold.
Inventors:
DECOST NORMAN
Application Number:
PCT/US2002/009598
Publication Date:
June 03, 2004
Filing Date:
March 29, 2002
Export Citation:
Assignee:
REHRIG INT INC (US)
International Classes:
B29C44/34; B29C45/17; (IPC1-7): B29C44/02; B29C45/00
Download PDF: