RE036572 cites 37 patents.

A mold for producing foamed articles includes an upper mold and a lower mold which define a mold cavity. A vent is provided in communication with the mold cavity and has a vent passageway with an entrance and an exit. Structure is also provided for sealingly engaging the upper mold with the lower mold to cause, in cooperation with the predetermined size and shape of the vent passageway, liquid foam polymeric composition expanding inside the mold cavity to enter the vent entrance but to not exit from the vent exit to cause at least partial curing of the foam composition within the vent passageway. Preferably, the vent may be ribbon-shaped so that a ribbon of foamed composition adheres to the foamed article and may be folded flat against the article thus avoiding the labor step of trimming the flash from the product. Additionally, .[.or alternatively,.]. the vent may include a vent passageway with an obstruction disposed therein to provide one or more openings between the outer surface of the obstruction and the inner surface of the vent passageway. The foam composition in these openings may be expelled by driving the obstruction axially within the passageway. Again, the labor step of hand trimming the flash is avoided.

Title
Mold having vent passageways to obviate trimming of flash
Application Number
939704
Publication Number
RE36572
Application Date
April 2, 1997
Publication Date
February 15, 2000
Inventor
Wilfred Wang Tai Chang
Oakville
CA
Gerry Vande Wetering
Georgetown
CA
Robert Basil Magee
Caledon East
CA
Craig Allen Hunter
Milton
CA
Leslie Edward Clark
Cambridge
CA
Agent
Fitzpatrick Cella Harper & Scinto
Assignee
Woodbridge Foam Corporation
CA
IPC
B29C 44/58
B29C 33/40
B29C 33/10
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