| 摘要 |
A sheet of a rubber material is rolled by a pair of rotating rolling rollers 12 and 13 opposed to each other to form a sheet 1. Sheets 1 are superposed and laminated to form a structural component of a tire. At least the rolling roller 12 is provided with an annular protrusion 20 and annular grooves 21 for shaping the sheet 1. Fine ridges 12a (31a) are formed in the surfaces of the annular protrusion 20 and the annular grooves 21. When the rolling rollers 12 and 13 are rotated to form the sheet 1, furrows and fine grooves 2 for releasing air are formed simultaneously in the surface of the sheet 1. The sheet 1 provided with the furrows and the fine grooves can be formed by a reduced number of manufacturing steps, while the fine grooves with the same shape can be formed. <IMAGE> |
