Abstract: An object is to reduce a cycle time for fabricating a low rolling resistance pneumatic tire and to provide the same pneumatic tire. As a means therefor, in building a tread portion by winding spirally a rubber strip material whose cross section is divided into a first region made of a conductive rubber and a second region made of a non-conductive rubber in a tire circumferential direction in a partially overlapping fashion by the use of an extruding machine which extrudes continuously the rubber strip material, an area ratio of the first region relative to the cross section of the rubber strip material is made to change in a tire width direction.

Abstract: An object is to provide a pneumatic tire which can exhibit a static elimination function in an ensured fashion and be fabricated easily. As a means therefor, there is provided a pneumatic tire in which a conductive layer 12a and a non-conductive layer 14a are wound alternately in a tire circumferential direction in a partially overlapping fashion at least in part of a tread portion, characterized in that the conductive layer 12a is provided wider than the non-conductive layer 14a.

Abstract: When forming a rubber member which is made up of a combination of a plurality of rubber compounds by winding spirally a ribbon-shaped unvulcanized rubber strip material in an overlapping fashion, the number of times of winding is reduced so as to shorten a fabrication cycle time of the rubber member to thereby increase the productivity thereof. As a means therefore, a rubber strip material whose cross section is divided into two or more regions which are made up of different rubber compounds is wound spirally on to a drum in an overlapping fashion so as to build a green tire or a tire rubber member.

Abstract: An object is to extrude stably a rubber strip material of a predetermined cross-sectional shape without reducing an extruding speed of the rubber strip material from an extruding die. An extrusion method is provided for the rubber strip material which is used in a tire fabrication process in which an unvulcanized rubber strip material which is extruded from an extruding die of an extruding machine is wound spirally to build a tire rubber member, such that a pair of rotatable rolls are provided at a distal end portion of the extruding die in such a manner that their outer circumferential surfaces confront each other, and in that a rubber material is extruded continuously into a ribbon shape from a gap defined by the pair of confronting rolls.

Abstract: The invention provides a radial tire, in which a single rubber coated cord (C1) is used to form a carcass layer (1) without generating any material jointed portion and which is favorable in weight balance, external appearance, and quality and excellent in productivity, the carcass layer (1) is formed from at least one cord row layer (11A) formed by cutting a rubber coated cord (C1), which is formed to make an external shape of a cross section elliptical, one by one, to align and bond the same in a tire circumference direction, and the cord row layer is jointed only in a single location on a tire circumference to generate little overlap.

Abstract: The invention is made to accelerate extrusion forming by reducing a friction between a forming rubber formed to cover a cord or formed to extrude and an inner wall face of a path at inside of a die as the die used for an extrusion forming head, a portion of an upstream portion of a rubber forming path (2) reaching a front end outlet (4) from a rubber storing portion (3) at inside of a die main body 1 is provided with a fluid sending inlet (8) for sending a fluid between an outer peripheral face of a forming rubber (R1) at inside of the rubber forming path (2) and an inner wall face of the path and a resistance of passing the forming rubber (R1) on a downstream side is reduced by the fluid.

Abstract: The invention can efficiently provide a carcass member constituting a carcass layer of a radial tire, particularly, a carcass member a direction of a cord of which constitutes an angle of substantially 90° relative to a tire circumferential direction, and can easily adjust a length in accordance with a size, one piece of a cord (C) is continuously passed through a rubber coating die (14) to coat rubber on the cord, the rubber coated cord (C1) is shaped such that a sectional outer shape thereof constitutes an elliptical shape, the rubber coated cord (C1) is wound around an aligning drum (30) while adjusting a direction of the elliptical shape by way of an aligning guide (20) to bond without producing a gap to form a cylinder-like member (A1), thereafter, the cylinder-like member (A1) is cut in a direction in parallel with the drum axis center to constitute a sheet-like shape.

Abstract: The invention can efficiently provide a carcass member constituting a carcass layer of a radial tire, particularly, a carcass member a direction of a cord of which constitutes an angle of substantially 90° relative to a tire circumferential direction, and can easily adjust a length in accordance with a size, one piece of a cord (C) is continuously passed through a rubber coating die (14) to coat rubber on the cord, the rubber coated cord (C1) is shaped such that a sectional outer shape thereof constitutes an elliptical shape, the rubber coated cord (C1) is wound around an aligning drum (30) while adjusting a direction of the elliptical shape by way of an aligning guide (20) to bond without producing a gap to form a cylinder-like member (A1), thereafter, the cylinder-like member (A1) is cut in a direction in parallel with the drum axis center to constitute a sheet-like shape.

Abstract: An object is to extrude stably a rubber strip material of a predetermined cross-sectional shape without reducing an extruding speed of the rubber strip material from an extruding die. As a means therefor, there is provided an extrusion apparatus 10 for a rubber strip material for use in a tire fabrication process in which an unvulcanized rubber strip material S which is extruded from an extruding die 20 is wound spirally to build a tire rubber member, characterized in that a pair of rotatable rolls 24, 26 are provided at a distal end portion of the extruding die 20 in such a manner that their outer circumferential surfaces confront each other, and in that an extruding discharge port 28 is formed in a gap defined by the pair of confronting rolls 24, 26.

Abstract: The invention makes a rubber covering process for cords and processes of cutting and aligning cords a series of processes to enable simplification of installations and processes and manufactures a belt member of high quality, in which straightness and rubber adhesiveness of cords can be improved. As measures therefor, a belt member 50 of a predetermined width, in which a single cord C is made oblique, is fabricated by feeding a single cord C while maintaining straightness thereof in a longitudinal direction, passing the cord through a rubber covering die 15 during the feed to cover the cord C with rubber, subsequently feeding a tip end side portion of the rubber covered cord C1 to a constant rate cut line 20 to cut the tip end side portion of the rubber covered cord C1 every feed, and feeding the rubber covered cord C1 having been cut to an alignment table 30 in a state of maintaining the straightness to sequentially align and join the same obliquely to a cord direction.

Abstract: A process for producing easily in high efficiency an inner liner having strip pieces obtained by cutting a ribbonlike rubber strip at given length arranged in parallel relationship in the across-the-width direction, aligned in the direction of tire circumference and bonded together. The process comprises spirally winding ribbonlike rubber strip (21) round liner forming drum (10) at given pitch so as to make partial superimposition, thereby obtaining tubular matter (20), and cutting the tubular matter (20) at one position on the circumference thereof in the across-the-width direction so as to provide a sheet wherein severed strip pieces (21A) are bonded to each other in the state of being aligned in parallel relationship, having a length corresponding to the length of liner circumference on a forming drum in the tire forming step, and wherein the two ends on the starting side and terminating side of the spirally winding can be joined together on the forming drum.

Abstract: A radial tire that has excellent weight balance and appearance quality and that can be produced at excellent productivity. These are achieved by forming a carcass layer (1) by using a single rubber coated cord (C1) without producing joints on a material. The carcass layer (1) is constructed from at least one layer of cord row layer (11A) where rubber coated cords (C1) are cut on piece by piece basis and joined aligned in the circumferential direction of the tire. Each of the rubber coated cords is formed in a cross-section with an oval outline. The cord row layer is joined at only one portion in the circumferential direction of the tire, so that there is substantially no overlap on the layer.

Abstract: The invention is made to accelerate extrusion forming by reducing a friction between a forming rubber formed to cover a cord or formed to extrude and an inner wall face of a path at inside of a die as the die used for an extrusion forming head, a portion of an upstream portion of a rubber forming path (2) reaching a front end outlet (4) from a rubber storing portion (3) at inside of a die main body 1 is provided with a fluid sending inlet (8) for sending a fluid between an outer peripheral face of a forming rubber (R1) at inside of the rubber forming path (2) and an inner wall face of the path and a resistance of passing the forming rubber (R1) on a downstream side is reduced by the fluid.

Abstract: An object is to provide a pneumatic tire which can exhibit a static elimination function in an ensured fashion and be fabricated easily. As a means therefor, there is provided a pneumatic tire in which a conductive layer 12a and a non-conductive layer 14a are wound alternately in a tire circumferential direction in a partially overlapping fashion at least in part of a tread portion, characterized in that the conductive layer 12a is provided wider than the non-conductive layer 14a.

Abstract: When forming a rubber member which is made up of a combination of a plurality of rubber compounds by winding spirally a ribbon-shaped unvulcanized rubber strip material in an overlapping fashion, the number of times of winding is reduced so as to shorten a fabrication cycle time of the rubber member to thereby increase the productivity thereof. As a means therefore, a rubber strip material whose cross section is divided into two or more regions which are made up of different rubber compounds is wound spirally on to a drum in an overlapping fashion so as to build a green tire or a tire rubber member.

Abstract: An object is to reduce a cycle time for fabricating a low rolling resistance pneumatic tire and to provide the same pneumatic tire. As a means therefor, in building a tread portion by winding spirally a rubber strip material whose cross section is divided into a first region made of a conductive rubber and a second region made of a non-conductive rubber in a tire circumferential direction in a partially overlapping fashion by the use of an extruding machine which extrudes continuously the rubber strip material, an area ratio of the first region relative to the cross section of the rubber strip material is made to change in a tire width direction.

Abstract: The invention can efficiently provide a carcass member constituting a carcass layer of a radial tire, particularly, a carcass member a direction of a cord of which constitutes an angle of substantially 90° relative to a tire circumferential direction, and can easily adjust a length in accordance with a size, one piece of a cord (C) is continuously passed through a rubber coating die (14) to coat rubber on the cord, the rubber coated cord (C1) is shaped such that a sectional outer shape thereof constitutes an elliptical shape, the rubber coated cord (C1) is wound around an aligning drum (30) while adjusting a direction of the elliptical shape by way of an aligning guide (20) to bond without producing a gap to form a cylinder-like member (A1), thereafter, the cylinder-like member (A1) is cut in a direction in parallel with the drum axis center to constitute a sheet-like shape.

Abstract: A method and device for manufacturing tire's annular member having a stretch mainly in radial direction by use of simple devices and simple way of pressing with high precision and easiness, as to produce tire product in high quality with no fluctuation of mass and/or uniformity, comprising: a first mold including a profile mold having an annular recess; a second mold which faces the first mold; and an extruder that continuously extrudes a rubber body into the recess of the profile mold. Concurrent with such extruding, the profile mold is rotated by one turn so as to charge the rubber body into the annular recess in a manner as annularly continuous. Then, the first and the second molds are brought abut each other so as to press the rubber body between the profile and second molds; thus shaping the rubber body into a shape defined by the profile mold.

Abstract: Method for forming a rubber strip which enables a wider rubber of small thickness without lowering an extruding speed and enables to reduce a building cycle time, thereby increasing the efficiency of tire manufacturing. Temperatures at a main-part casing 11, a screw shaft 12 and a head region included with the die 13 are controlled to be different from each other in a manner that: the temperature as controlled in the main-part casing 11 is higher than that in the screw shaft 12; and the temperature as controlled in the head region is higher than that in the main-part casing 11, when continuously extruding a rubber material in a form of a ribbon in forming a rubber strip 1.

Abstract: A method and device for manufacturing tire's annular member having a stretch mainly in radial direction by use of simple devices and simple way of pressing with high precision and easiness, as to produce tire product in high quality with no fluctuation of mass and/or uniformity, comprising: a first mold including a profile mold having an annular recess; a second mold which faces the first mold; and an extruder that continuously extrudes a rubber body into the recess of the profile mold. Concurrent with such extruding, the profile mold is rotated by one turn so as to charge the rubber body into the annular recess in a manner as annularly continuous. Then, the first and the second molds are brought abut each other so as to press the rubber body between the profile and second molds; thus shaping the rubber body into a shape defined by the profile mold.