| 摘要 |
PURPOSE:To prevent a sipe from being closed on the whole surface at a time of grounding and to secure the draining properties by laminating a plurality of thin plates such as metallic sheets different in shape to form a siping blade and, by utilizing this siping blade, equipping the siping having partially different width. CONSTITUTION:A siping blade 3 buried by both the inner circumferential face 2 and the rib 1 of a mold is formed by laminating two or three sheets of metallic sheets 4. When a through-hole 8 is provided to only one metallic sheet 4 selected from two metallic sheets 4, the width of the siping is narrowly formed in the part of this through-hole 8. At a time for vulcanizing and molding a tire, the air trapped in the recess of a mold described hereunder is discharged via a vent hole 9 from the slight gap between a plurality of sheets of laminated metallic sheets 4 of the siping blade 3. This mold forms the block part on the surface of a tread and is utilized for vulcanization and molding. The driving and breaking performances of the tire are enhanced in a wetted path. |
