US 7,481,637 B2
Vented mold and method for producing molded article
Allan K. Cathcart, Kendal (Canada); Leslie E. Clark, Cambridge (Canada); Larry A. Genyn, Mississauga (Canada); Louie J. Meneses, Windsor (Canada); and Randall J. Lansue, Belleville, Mich. (US)
Assigned to Woodbridge Foam Corporation, (Canada)
Filed on Oct. 27, 2004, as Appl. No. 10/973,985.
Claims priority of provisional application 60/570075, filed on May 12, 2004.
Prior Publication US 2005/0253293 A1, Nov. 17, 2005
Int. Cl. B29C 44/02 (2006.01)
U.S. Cl. 425—4R  [425/127; 425/817 R; 425/812] 56 Claims
OG exemplary drawing
 
1. A mold for producing molded articles, the mold comprising:
a first mold and a second mold releasingly engageable between an open position and a closed position, the closed position defining a mold cavity; and
a surface of the mold cavity comprising a plurality of grooves connected to a plurality of vents, at least two of said vents being in fluid communication with each other through said plurality of grooves, each vent comprising a passageway for gas to escape from the mold cavity, each groove configured to have: (i) a depth of up to about 10 mm and a width, the depth being greater than or equal to the width, and (ii) a cross-sectional shape comprising an open portion having a first width of up to about 5 mm and an apex portion having a second width less than the first width.