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 12 a ( 31 a) 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.
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