Patent ID: 7628881

Claim:
A manufacturing method of a rubber member for a tire comprising a winding step of forming the rubber member in which a rubber strip is overlapped, by overlapping and spirally winding the rubber strip on a cylindrical to-be wound body while shifting the rubber strip from one side to the other side of the axial direction of the to-be wound body; wherein a plurality of air-vent grooves capable of discharging air between the overlapped rubber strips are arranged on at least one of surfaces of the rubber strip, each of the air-vent grooves has an angle θ of 20 to 90° with respect to a longitudinal direction of the rubber strip, and extends between side lines of the rubber strip, a maximum width of the air-vent groove being 0.3 to 3.0 mm, and a maximum depth of the air-vent groove being 0.1 to 3.0 mm, and each of the air-vent grooves includes one or more air-vent holes extending to penetrate the rubber strip.