Sumitomo Rubber Industries Limited

Gaku Tanaka

Kazuaki Yarimizu

Masayuki Sakamoto

Toru Fukumoto

A method and an apparatus for butt-jointing edges of an elastic material sheet is disclosed. The elastic material sheet is supported such that the two edges to be butt-jointed are oppositely opposed. By moving a pair of counterrotating conical surfaces along the edges, the surfaces of the edges portions are drawn toward the center between the two edges so that the edges are butt-jointed. Between the conical surfaces, a small space is provided so as to form a small rib-like protrusion along the butt-joint. Then, the small rib-like protrusion of the elastic material is pressed down to flatten. Therefore, at the butt-joint interface, the elastic material irregularly interfuses to increase the strength of the butt-joint.

Method and apparatus for butt-jointing edges of elastic material sheet

A method of manufacturing a tire reinforcing material for achieving uniformity in stiffness at a joint of a ply of a cord fabric and improving dynamic uniformity of a tire shaped and vulcanized, the cord fabric constructed of warp cords arranged in parallel with each other and wefts arranged substantially orthogonally to the warp cords, includes: a topping step for coating with rubber the cord fabric having the wefts folded back at respective warp cords at opposing ends of the cord fabric to produce a ply; a cutting step for cutting the ply into ply pieces each having a predetermined length; a joint forming step for removing one to five cords at each of opposing ends of the ply to form a joint; and a joining step for joining together the joint of one of the ply pieces and the joint of another ply piece.

Manufacturing method of tire reinforcing material and manufacturing method of pneumatic tire using the tire reinforcing material

A method of manufacturing a rubber coated fabric for a tire which includes a weft cutting step of cutting a weft of the rubber coated fabric base substance using a cutting device at a cut pitch Cp of two to five times an arrangement pitch P of a warp. The cut ductility of the weft is set between 5 and 20%. The cutting device utilizes first and second rollers in which the peripheral protrusions and the peripheral grooves are alternately formed. Groove widths Wand Wof the peripheral grooves of the first and second rollers are set between 2.0 and 5.0 mm, protruding widths Tand Tof the peripheral protrusions of the first and second rollers are set to 0.25 to 0.5 times the groove widths Wand Wand the insertion depths hand hof the peripheral protrusions to the peripheral grooves are set between 2.0 and 4.0 mm.

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Kobe, Japan

Gaku Tanaka