Patent ID: 6503355
Filing Date: 2003-01-07
Classification: A43B,B29C,B29D,B29K,B29L

Abstract:
A process for the formation of vulcanized hollow bodies from vulcanizable materials having airtight or air circulating chambers (11) and including spacing pegs (10), bellows (9, 9â€²), reticular channels (12), airtight walls (28) and/or inserts (15), by introducing the various components or details (1â€²,22â€²,23â€²,2â€²) between a lower half-mold (4) and an upper half-mold (7) of a mold and the formed hollow body is then vulcanized, said process comprising:a) providing upper half-mold (7) with protruding peduncles (8), foils (26) and/or means for forming reticular channels (12); b) positioning the details (1â€²,22â€²,23â€²,2â€²) on each surface of the lower half mold (4) and upper half-mold (7); c) preforming the details (1â€², 22â€²,23â€²,2â€²) on the surface of the lower and upper half-molds (4,7); d) fixing spacing pegs (10) on the surface of one of the details (1â€²,22â€²,23â€²,2â€²) by adhesion, said spacing pegs (10) being arranged between the details carried by the upper and lower half-molds; e) coupling the lower and upper-half molds and airtight sealing along the edge of mutual touch (13) of the lower and the upper half-molds, the details of the one half-mold including the protruding peduncles (8) and foils (26) contacting the details of the other half-mold; f) injecting air or other fluid under pressure in the inside of the mold between the upper and lower details to form airtight chambers (11), separating walls (28) and reticular channels (12), and to press the respective. details positioned on each surface of the lower half-mold (4) and upper half-mold (7) against the respective half-mold surface; g) vulcanizing the formed hollow bodies by heating the mold at a temperature between 100 and 170Â° C.; and h) cooling the mold, opening the mold and extracting the formed vulcanized hollow body.