A novel method of molding an article includes providing a mold with a vent of a pre-determined size such that, due to the difference in viscosities, gases to be vented from the mold may easily pass through the vent while the material to be molded cannot quickly pass through the vent. In fact, the vent is designed such that the material to be molded which enters the vent, does not exit the end of the vent. In the most preferred embodiment, the vent is in the form of a thin ribbon-like groove so that the material to be molded which does enter the vent forms a thin ribbon of extruded material which need not be removed prior to a finish cover being applied to the molded article.

Title
Vented mould and use thereof
Application Number
93109740
Publication Number
1105314
Application Date
September 2, 1993
Publication Date
July 19, 1995
Inventor
Robert Basil Magee
Craig Allen Hunter
Leslie Edward Clark
Robert Basil Magee
Craig Allen Hunter
Leslie Edward Clark
Agent
LIU GUOPING
Assignee
Woodbridge Foam Corporation Woodbridge Foam Corporation
IPC
B29C 44/58