B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1005, 18/1176
B29C 35/02 (2006.01) B29C 35/00 (2006.01)
Patent
CA 1104785
ABSTRACT OF THE DISCLOSURE A method for curing reinforced vulcanizable elastomeric articles disposed between a mold surface and a pressure chamber and articles produced thereby. The method comprises delivering into the chamber a hot fluid of relatively high heat capacity and pressurizing the fluid to a first pressure; maintaining the fluid in the chamber at the first pressure for a residence period sufficient to at least partially soften the elastomeric article but insufficient to significantly vulcanize the elasto- meric article; while the elastomeric article is in a softened state delivering into the chamber in admixture with the fluid a gas of low heat capacity relative to the hot fluid; pressurizing the gas and fluid in the chamber to a second pressure from about 300 to about 520 psi thereby causing the elastomeric article to flow into' conformance with the mold surface; and thereafter vulcanizing the elastomer article by heating the mold surface. The method is particularly suited to the production of power transmission belting, and the article produced thereby is characterized by superior wear life.
237342
Fetherstonhaugh & Co.
Gates Rubber Company (the)
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