Rubber strip for forming tire rubber member, tire using the same, and rubber strip manufacturing apparatus

摘要

A rubber tape (9) for making up a rubber component of a tyre has a specific shape wherein a fin (9B) is provided on each side of a central part (9A), the central part (9A) has a thickness (T1) of 0.3 to 1.5 mm, the fin (9B) has a thickness (T2) less than the thickness (T1) and a width (W2) of from 0.5 to 5.0 mm. A method of manufacturing a tyre comprises a step of making at least one of its rubber components by winding the rubber tape (9). An apparatus for making the rubber tape (9) comprises an extruder (13) and a pair of calendar rollers (14), wherein the extruder (13) includes a die (17) having an extruding hole (16) from which compounded rubber is extruded into a rectangular cross sectional shape, the extruding hole (16) has an opening width WA1 of from 0.6 to 0.9 times the whole width W0 of the rubber tape (9) and an opening thickness HA1 of from 1.5 to 7.5 times the average thickness of the central part (9A) of the rubber tape, and the calendar rollers (14) are provided therebetween with a gap between which the extruded rubber passes through, the gap having a shape which is similar to but smaller than a cross sectional shape of the rubber tape. IMAGE