Tire mold lamella for forming fine slits in tread profiles comprises a single grid, net or grating which is mounted in recesses in the vulcanizing tool

摘要

The lamella comprises a one-piece grid, net or grating with six or more end faces(2,3) protruding into the molding cavity of a tire vulcanizing tool. Some(3) end faces of the lamella are 0.1-0.5mm, preferably 0.3mm, thick. Other end faces(2) are 0.4-0.8mm, preferably 0.6mm, thick. The ratio of the thicker end faces to thinner end faces is 2:5. Height of the edges(4,5) of a lamella is 0.5-6mm and the lamella edges may have venting holes(6). The total number of end faces in a lamella is 6-60. Extensions on the underside of the edges permit connection with a tool. Lower end faces of the lamella are spaced 0.001-0.1mm above the tool surface. Independent claims are included for: a) a tire vulcanizing mold with ribs on the radially inner side which surround recesses for forming profile blocks on the tire and holding the claimed one-piece lamella; b) a process for manufacturing a lamella in which the latter is cut out of a steel block by laser or water jet; c) a process for manufacturing a lamella in which the latter is cut directly into the tire vulcanizing tool using a water jet.