Sumitomo Rubber Industries Limited

Takamichi Sagawa

Seiji Tomono

Hiromasa Okubo

Toshikazu Ogita

Masayuki Sakamoto

Kenji Ueda

Makoto Sakuraoka

Toshiyuki Mafune

Toshiaki Ono

A pneumatic tire manufacturing method is provided in which winding collapse is prevented, there is no possibility of adverse effects on the FV, a current-carrying layer can be formed easily, and down-stitching can be dispensed with or minimized in the manufacture of SOT-structure pneumatic tires having a base-pen structure in the tread. This pneumatic tire manufacturing method involves: a step in which a sidewall, an inner liner, and a ply are bonded on a first molding drum, beads are set, and the tread side part that will form the current-carrying layer is formed on the side wall, forming a first cover; a step in which a breaker and band are bonded on a second molding drum and the tread center part is formed on the band, shaping the tread ring; a step in which the first cover is inserted inside of the tread ring and inflated to bond to the tread ring with pressure; and a step in which the sidewall is bonded to the lateral surface of the first cover, and the tread side part and the tread center part are bonded together.

Pneumatic tire manufacturing method, and pneumatic tire

A pneumatic tire manufacturing method is provided in which raw cover molding is suitably performed with no, or a minimal amount of, down-stitching in the manufacture of SOT-structure pneumatic tires; also provided is a pneumatic tire. This pneumatic tire manufacturing method involves a first cover molding step for molding a first cover having a sidewall, an inner lining, a ply, beads and a tread-side edge, a tread ring forming step for forming a tread ring having a breaker, a band and a tread center part, a shaping step for pressure-bonding the tread ring and the first cover to mold this to the shape of the raw cover, and a turn-up step for bonding the side wall to the lateral surface of the first cover, wherein the tread-side edge is formed in a position adjacent to the end of the tread center portion in the shaping step, and in the turn-up step, the tread-side edge and the tread center part are bonded together.

A pneumatic tire manufacturing method is provided in which raw cover molding is suitably performed with no, or a minimal amount of, down-stitching in the manufacture of SOT-structure pneumatic tires; also provided is a pneumatic tire. This pneumatic tire manufacturing method involves: a step in which a sidewall, an inner liner, and a ply are bonded on a first molding drum, a pair of beads is set, and the tread side part is formed on the side wall, forming a first cover; a step in which a breaker and band are bonded on a second molding drum and the tread center part is formed on the band, shaping the tread ring; a step in which the first cover is inserted inside of the tread ring and the first cover is inflated, bonding the tread ring and the first cover with pressure; and a step in which the sidewall is folded back towards the lateral surface of the inflated first cover and bonded to the lateral surface of the first cover, and the tread side part and the tread center part are bonded together.

A pneumatic tirehaving a toroidal carcassextending from a tread portionthrough a sidewall portionto a bead corein a bead portion, is provided in the bead portionwith a bead reinforcing rubber layeralong an outer surface in the tire axial direction of the carcass. The bead reinforcing rubber layeris formed from a band-like rubber stripwound spirally circumferentially of the tire. In a tire meridian section including the tire rotational axis, each of the inner surface Si and the outer surface So in the tire axial direction of bead reinforcing rubber layerhas adjacent rubber strip's interfaces, and the number of the interfaceson the inner surface Si is smaller than the number of the interfacesin the outer surface So.

Pneumatic tire

A green tire includes a surface layer defining a green tire surface and made up of a plurality of windings of an unvulcanized rubber tape. A part of each of the windings is exposed on the green tire surface so that the exposed part has a width of from 50% to 80% of the width Wof the rubber tape. Each of the windings has a substantially rhomboid cross section and has one end at an acute angle corner exposed on the green tire surface and the other end at the opposing acute angle corner. An angle theta of a diagonal line of the rhomboid drawn between the one end and the other end is not more than 30 degrees with respect to a tangential line to a profile line of the green tire surface.

Green tire and method for manufacturing pneumatic tire

A printing blanket according to the present invention is substantially composed of a base fabric and a surface printing layer, and a part or the whole of the base fabric is composed of hollow fibers. The printing blanket is superior in productivity because it has a simpler structure than that of an air-type printing blanket, and has excellent compression properties similar to those of the air-type printing blanket.

Printing blanket

The present invention provides a printing blanket which includes a first compressive layer which is porous and seamless, a non-expansion layer formed by spirally winding a wire in a circumferential direction of the blanket so that a distance between adjacent wires is not more than 0.5 mm, a second compressive layer which is porous and seamless, a surface printing layer which is seamless and non-compressive, and a cylindrical sleeve to be fit over a blanket cylinder, wherein these layers are laminated in this order on the outer peripheral surface of this cylindrical sleeve directly or through a seamless adhesive layer. According to this printing blanket, piling caused at the time of high-speed printing is inhibited and printing can be performed in high productivity.

A printing blanket according to the present invention is provided with a non-stretchable layer formed by arranging hollow yarn in a predetermined direction inside a surface printing layer constituting an elastomer. The printing blanket is and formed in a seamless cylindrical shape in the circumferential direction, is superior in productivity because it has a simpler structure than that of an air-type printing blanket, and has excellent compression properties similar to those of the air-type printing blanket.

A printing blanket in which an open cell compressible layer and a closed cell compressible layer are provided inside a surface printing layer, which has such superior characteristics that it has the advantages of both the compressible layers and does not cause a variety of problems which are caused by the disadvantages of both the compressible layers.

A printing blanket according to the present invention is formed by laminating a non-stretchable layer obtained by winding a thread in helical fashion in the circumferential direction, a compressible layer comprising an elastomer and in a porous and a seamless cylindrical shape, and a surface printing layer similarly comprising an elastomer and in a seamless cylindrical shape in this order, whereby high-quality prints can be obtained in a wide range, and the degree of the degradation of printing properties due to the reduction in reaction force is low.

Growing community of inventors

Kobe, Japan

Takamichi Sagawa