WO2013108464A1 - 空気入りタイヤの製造方法 - Google Patents
空気入りタイヤの製造方法 Download PDFInfo
- Publication number
- WO2013108464A1 WO2013108464A1 PCT/JP2012/078187 JP2012078187W WO2013108464A1 WO 2013108464 A1 WO2013108464 A1 WO 2013108464A1 JP 2012078187 W JP2012078187 W JP 2012078187W WO 2013108464 A1 WO2013108464 A1 WO 2013108464A1
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- WO
- WIPO (PCT)
- Prior art keywords
- band
- cord
- tire
- ply
- strand
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
- B29D30/16—Applying the layers; Guiding or stretching the layers during application
- B29D30/1621—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it spirally, i.e. the band is fed without relative movement along the core axis, to form an annular element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0661—Rigid cores therefor, e.g. annular or substantially toroidal cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
- B29D30/12—Cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
- B29D30/16—Applying the layers; Guiding or stretching the layers during application
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
- B29D30/16—Applying the layers; Guiding or stretching the layers during application
- B29D30/1628—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the core axis, to form an annular element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
- B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
- B29D30/30—Applying the layers; Guiding or stretching the layers during application
- B29D30/3021—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it spirally, i.e. the band is fed without relative movement along the drum axis, to form an annular element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/005—Reinforcements made of different materials, e.g. hybrid or composite cords
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2257—Diameters of the cords; Linear density thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
- B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
- B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
- B60C2009/2252—Physical properties or dimension of the zero degree ply cords
- B60C2009/2261—Modulus of the cords
Definitions
- the present invention relates to a method for manufacturing a pneumatic tire using a rigid core.
- vulcanization stretch As a method for producing a pneumatic tire, a step of forming a raw tire smaller than a finished tire, and the raw tire are expanded in a vulcanization mold (hereinafter, sometimes referred to as “vulcanization stretch”).
- vulcanization stretch There is known one including a step of vulcanization molding by pressing an outer surface of a green tire against an inner surface of a mold.
- the band cord of a tire manufactured by this method has an elongation of 3 to 4% due to vulcanization stretch even when the internal pressure is not filled. Therefore, even when a nylon cord having a relatively small modulus is adopted as the band cord, a sufficient tagging effect is exhibited when the tire is used, and lifting can be suppressed.
- Patent Document 1 proposes a tire manufacturing method using a rigid core having an outer surface that approximates the inner shape of the finished tire (hereinafter sometimes referred to as “core method”). ing.
- core method tire components such as uncured carcass ply, belt ply, band ply, bead core, tread rubber, and sidewall rubber are sequentially attached to the outer surface of the rigid core, so that the finished tire A green tire having substantially the same shape is formed.
- the raw tire is vulcanized and molded together with a rigid core into a vulcanization mold.
- the tire formed by the core method hardly receives vulcanization stretch. For this reason, the band cord of the tire does not have elongation in a state where the internal pressure is not filled. Therefore, when a nylon cord having a small modulus is adopted as the band cord of the tire, the restraining force on the belt layer is insufficient, and it is difficult to suppress lifting.
- High modulus aramid fiber cords may be used for the band cords to increase the binding force of the band ply.
- an aramid fiber cord does not shrink by heat, when an aramid fiber cord is used for a band cord of a tire manufactured by a core method, the band cord is not subjected to tension and is easily slackened or meandered inside the tire. In such a tire, there is a possibility that compression distortion repeatedly occurs in the meandering portion of the band cord during traveling, and the cord is broken.
- the present invention has been devised in view of the above problems, and as a band cord, a composite cord of an aramid fiber and a heat-shrinkable organic fiber is used, and the inflection point of the composite cord is used.
- Air that can improve high-speed durability performance by exhibiting high restraint force while suppressing meandering of the band cord during vulcanization molding and suppressing breakage of the cord, based on defining the modulus in elongation and low elastic range It aims at providing the manufacturing method of a entering tire.
- the present invention includes a carcass made of a carcass ply extending from a tread portion through a sidewall portion to a bead portion, a belt layer including a belt ply disposed outside the carcass in the tire radial direction and inside the tread portion,
- a pneumatic tire manufacturing method comprising a band layer including a band ply disposed on the outer side in the tire radial direction of a belt layer, wherein an unvulcanized carcass ply, a belt ply, and a band are formed on an outer surface of a rigid core.
- the green tire forming step includes a ribbon in which a band cord array in which one band cord or a plurality of band cords are arranged is covered with a topping rubber.
- the composite cord has an elongation at the inflection point of 0.9 to 3.3%, and a modulus of 11 to 31 N / in the low elasticity region. %.
- the heat-shrinkable organic fiber is preferably nylon, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN).
- the first strand preferably has a total fineness of 2200 dtex or less.
- the second strand has a total fineness of 1100 dtex or less.
- a pneumatic tire is manufactured by a core method.
- a composite cord in which a first strand made of aramid fibers and a second strand made of heat-shrinkable organic fibers are twisted is adopted as the band cord of the pneumatic tire.
- the composite cord When the composite cord is vulcanized, the second strand receives heat and contracts. Therefore, even in the core method without vulcanized stretch, the composite cord shrinks in the tire and receives tension. As a result, loosening and meandering of the band cord is suppressed, and as a result, breakage of the band cord is suppressed.
- the composite cord has an elongation in the range of 0.9 to 3.3% at the inflection point of its stress-elongation curve.
- the composite cord has a low elastic region, and the modulus in the low elastic region is in the range of 11 to 31 N /%.
- the elongation at the inflection point of the composite cord exceeds 3.3%, the restraint force on the belt layer becomes insufficient during high speed running of a tire on which a large centrifugal force acts, and improvement in high speed durability cannot be expected.
- the elongation at the inflection point of the composite cord is less than 0.9%, it is necessary to reduce the number of twists of the first strand made of the aramid fiber.
- such cords are greatly affected by the physical properties of the aramid fibers, and there is a possibility that the riding comfort performance deteriorates due to high modulus and the cord breaks due to meandering of the composite cord.
- the modulus in the low elastic region is less than 11 N /%, the restraining force on the belt layer is lowered and the effect of improving the high-speed durability is sufficient. I can't get it. If the modulus in the low elastic region exceeds 31 N /%, the influence of the physical properties of the aramid fiber increases, and there is a possibility that the riding comfort performance deteriorates due to the high modulus and the cord breaks due to the meandering of the composite cord. Therefore, in order to achieve both high-speed durability and cord breakage, it is important to regulate both the elongation at the inflection point and the modulus at the low elastic range.
- FIG. 1 is a cross-sectional view of an example of a pneumatic tire 1 manufactured by the manufacturing method of the present invention.
- the pneumatic tire 1 includes a carcass 6 extending from the tread portion 2 through the sidewall portion 3 to the bead portion 4, a belt layer 7 disposed on the radially outer side of the carcass 6 and inside the tread portion 2, And a band layer 9 disposed radially outside the belt layer.
- the carcass 6 is formed from at least one carcass ply 6A in which a carcass cord is radially arranged, in this example, one carcass ply 6A.
- the carcass ply 6 ⁇ / b> A has a toroidal shape straddling the pair of bead portions 4 and 4.
- Each bead portion 4 is provided with a bead core 5.
- Each bead core 5 includes a core piece 5i on the inner side in the tire axial direction and a core piece 5o on the outer side in the tire axial direction.
- the end portions on both sides of the carcass ply 6 ⁇ / b> A terminate at the position of the bead core 5 without being folded around the bead cores 5 arranged in each bead portion 4, for example.
- both ends of the carcass ply 6 ⁇ / b> A are sandwiched between the core pieces 5 i and 5 o of each bead core 5.
- the core pieces 5i and 5o of the bead core 5 are formed by winding a non-extensible bead wire 5a in a spiral shape in the tire circumferential direction.
- the number of turns of the bead wire 5a of the outer core piece 5o is preferably about 1.2 to 2.0 times greater than that of the inner core piece 5i.
- the outer core piece 5i has a larger rigidity than the inner core piece 5i. This is useful for improving the steering stability and the like by relatively increasing the bending rigidity of the bead portion 4 while suppressing the total number of turns of the bead wire 5a.
- a bead apex 8 is arranged in the bead section 4.
- the bead apex 8 is made of, for example, rubber having a hardness of, for example, 80 to 100 degrees, and extends outwardly in the tire radial direction in a tapered manner from the core pieces 5i and 5o.
- the hardness of rubber means durometer A hardness measured in an environment of 23 ° C. based on JIS-K6253.
- the belt layer 7 is formed of at least one belt ply 7A, 7B in this example in which belt cords are arranged at an angle of, for example, 10 to 35 ° with respect to the tire circumferential direction.
- the belt cords cross each other between the plies 7A and 7B.
- the belt layer 7 has high rigidity and exhibits a tagging effect over substantially the entire width of the tread portion 2.
- the band layer 9 includes a band ply 9A in which a band cord is spirally wound in the tire circumferential direction.
- a band ply 9A a pair of left and right edge band plies that covers only the outer end of the belt layer 7 in the tire axial direction, or a full band ply that covers substantially the entire width of the belt layer 7 is appropriately selected.
- the band layer 9 is formed from one full band ply.
- the inner liner 10 is made of a non-air permeable rubber such as butyl rubber or halogenated butyl rubber, for example, in order to prevent leakage of air filled in the tire lumen.
- a side wall rubber 11 forming the outer surface of the side wall portion 3 is disposed outside the carcass 6.
- the tread rubber 12 that forms the outer surface of the tread portion 2 is disposed outside the band layer 9 in the radial direction.
- a method for manufacturing the pneumatic tire 1 will be described.
- a rigid core 20 is used as shown in FIG.
- the outer surface of the rigid core 20 has a tire forming surface portion 20 ⁇ / b> S that substantially matches the shape of the lumen surface 1 ⁇ / b> S of the pneumatic tire 1.
- a tire constituent member is pasted on the tire forming surface portion 20 ⁇ / b> S of the rigid core 20 to form a raw tire 1 ⁇ / b> N having a shape close to that of the pneumatic tire 1.
- the tire component includes at least an unvulcanized carcass ply 6A, belt plies 7A and 7B, a band ply 9A, and the like.
- the raw tire 1N is put into the vulcanization mold 21 together with the rigid core 20 and vulcanized. Thereby, the pneumatic tire 1 is manufactured.
- the raw tire forming step Ka includes, for example, an inner liner forming step of attaching a member for forming the inner liner 10 to the tire forming surface portion 20S of the rigid core 20, a carcass ply forming step of attaching a member for forming the carcass ply 6A, Bead core forming step for attaching a member for forming the bead core 5; Bead core forming step for attaching a member for forming the bead apex 8; Belt ply forming step for attaching a member for forming the belt plies 7A and 7B; A side wall forming step for attaching the member, a tread forming step for attaching a member for forming the tread rubber 12, and a band ply forming step for forming the band ply 9A are performed.
- well-known various methods are suitably employ
- a band cord array in which one band cord 15 or a plurality of band cords 15 are arranged in parallel is covered with a topping rubber 16.
- the strip 17 is spirally wound around the outside of the belt ply 7B to form the band ply 9A.
- the band cord 15 is composed of a composite cord 19 in which a first strand 18A made of an aramid fiber and a second strand 18B made of a heat-shrinkable organic fiber are twisted together.
- each strand 18 is pre-twisted beforehand.
- A As shown in FIG. 6 (A), a cord comprising a total of two strands 18 including one first strand 18A and one second strand 18B
- the cord is composed of a total of three strands 18 including two first strands 18A and one second strand 18B.
- C Although not shown, one first strand A cord composed of a total of three strands 18 including one strand 18A and two second strands 18B
- the two first strands 18A are twisted to form an intermediate strand, and then the intermediate strand and one second strand 18B are twisted to form.
- FIG. 7 shows a stress-elongation curve J of the composite cord 19.
- the composite cord 19 has a low elastic region YL that is a region from the origin 0 to the inflection point P and a high elastic region YH that is a region beyond the inflection point P.
- the composite cord 19 has an elongation Ep at the inflection point P in the range of 0.9 to 3.3%.
- the modulus M of the composite cord 19 is in the range of 11 to 31 N /% in the low elastic region YL.
- the inflection point P is a vertical line passing through the intersection point Px between the tangent line T1 of the stress-elongation curve J passing through the point Pa of 0% elongation and the tangent line T2 of the stress-elongation curve J passing through the breaking point Pb.
- -It is defined as the point that intersects the elongation curve J.
- the tangent line T2 is obtained by excluding this breaking point vicinity Ypb.
- the modulus M of the composite cord 19 in the low elastic region YL is defined as the slope of the tangent line T1.
- the composite cord 19 in which the first strand 18A made of an aramid fiber and the second strand 18B made of a heat-shrinkable organic fiber are twisted together is heated by the heat received in the vulcanization step Kb.
- the strand 18B is thermally contracted. Therefore, even in the case of the core method, slack and meandering of the composite cord 19 inside the tire are suppressed, and cord breakage is suppressed.
- the composite cord 19 When the elongation Ep at the inflection point P of the composite cord 19 exceeds 3.3%, for example, when traveling at a high speed where a large centrifugal force acts, the composite cord 19 shows only a low modulus, and the composite cord 19 (band cord) The restraining force due to 15) becomes insufficient, and the high-speed durability cannot be sufficiently improved.
- the elongation Ep at the inflection point P of the composite cord 19 is less than 0.9%, it is necessary to reduce the number of twists of the first strand 18A made of aramid fibers.
- the elongation Ep at the inflection point P of the composite cord 19 is preferably 1.6% or more.
- the composite cord 19 Even if the elongation Ep at the inflection point P is appropriate, when the modulus M in the low elastic region YL is less than 11 N /%, the composite cord 19 has a lower binding force and sufficiently improves high-speed durability. I can't. On the other hand, when the modulus M exceeds 31 N /%, the physical properties of the aramid fibers are dominant, and there is a possibility that the riding comfort performance is deteriorated or the cord is broken. Therefore, in order to achieve both high-speed durability and cord breakage, the composite cord 19 needs to regulate both the elongation Ep at the inflection point P and the modulus M at the low elastic region YL within the above range. is there.
- the modulus M is preferably 11 N /% or more, and preferably 18 N /% or less.
- the elongation Ep at the inflection point P of the composite cord 19 and the modulus M at the low elastic region YL are the thickness (fineness), the number of lower twists, and the number of upper twists of the first and second strands 18A and 18B. It can be adjusted by.
- the heat-shrinkable organic fiber has a heat shrinkage rate of 3.0% or more.
- the heat shrinkage rate is less than 3.0%, the effect of suppressing the meandering of the band cord is not sufficiently exhibited.
- an organic fiber for example, nylon, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is desirable.
- the “heat shrinkage rate” is in accordance with “Post-heating dry heat shrinkage rate (Method B)” in Section 8.10 (b) of JIS-L1017, and the cord is heated for 30 minutes at a temperature of 180 ° C. under no load. It means the dry heat shrinkage after heating.
- the first strand 18A and the second strand 18B have the same direction in the lower twist direction and the upper twist direction.
- the primary strand number na of the first strand 18A is, for example, about 42 ⁇ 5 times / 10 cm, and is set smaller than the primary strand number nb and the primary twist number nc of the second strand 18B.
- the first strand 18A preferably has a total fineness of aramid fibers of 2200 dtex or less. If this is exceeded, ride comfort may be reduced. Further, the total fineness of the heat-shrinkable organic fibers of the second strand 18A is preferably 1100 dtex or less, and if it exceeds this, the modulus of the low elastic region YL is difficult to be set within the above range.
- a pneumatic tire (size 215 / 45R17) having the internal structure shown in FIG. 1 was prototyped based on the manufacturing method of the present invention using a rigid core and the specifications shown in Tables 1 and 2. Each test tire was tested for ride comfort performance, durability performance (band cord breakability), and high-speed durability performance.
- the inflection point P of the band cord and the modulus M of the low elastic region YL were subjected to a tensile test at a clamp interval of 250 mm and a speed of 300 mm / min until the cord broke, and the “stress-elongation curve J obtained at that time was obtained. ” Further, when the band cord is made of one kind of organic fiber and does not have an inflection point, the modulus M of the low elastic region YL was obtained as the slope of the tangent of the “stress-elongation curve J” at 3% elongation.
- N is nylon 66
- A is aramid
- PET is polyethylene terephthalate
- PEN is polyethylene naphthalate.
- the thermal shrinkage rate of N was 4.5%
- the thermal shrinkage rate of A was 0%
- the thermal shrinkage rate of PET was 4.0%
- the thermal shrinkage rate of PEN was 1.6%.
- X / 2 a cord obtained by twisting two strands X of a twisted strand X with each other in an upper twist X / Y / 2: one strand X of a twisted strand X and one strand Y of a strand twisted Cords twisted together by upper twist X / 1: Cord consisting of a single strand X twisted (single twist cord) X / X / Y / Y / 4: A cord in which a total of four strands of two strands X of the lower twisted strand X and two strands of the lower twisted strand Y are twisted together by the upper twist X / X / Y / 3: Cord in which a total of three strands of two strands X of the twisted strand X and one strand of the twisted strand Y are twisted together by the top twist
- the tires of the examples can improve the high-speed durability performance and suppress the cord breakage while maintaining the riding comfort performance.
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- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Tires In General (AREA)
- Tyre Moulding (AREA)
Abstract
Description
図1は、本発明の製造方法によって製造された空気入りタイヤ1の一例の断面図である。空気入りタイヤ1は、トレッド部2からサイドウォール部3をへてビード部4に至るカーカス6と、このカーカス6の半径方向外側かつ前記トレッド部2の内部に配されるベルト層7と、該ベルト層の半径方向外側に配されるバンド層9とを具える。
本実施形態の製造方法は、図2に示されるように、剛性中子20が用いられる。剛性中子20の外表面は、空気入りタイヤ1の内腔面1Sの形状に実質的に一致するタイヤ形成面部20Sを有する。
(a) 図6(A)に示されるように、1本の第1のストランド18Aと、1本の第2のストランド18Bとを含む合計2本のストランド18からなるコード
(b) 図6(B)に示されるように、2本の第1のストランド18Aと、1本の第2のストランド18Bとを含む合計3本のストランド18からなるコード
(c)図示されないが、1本の第1のストランド18Aと、2本の第2のストランド18Bとを含む合計3本のストランド18からなるコード
・カーカス
プライ数:2枚
コード:1100dtex(PET)
コード角:90度
コード打込み数:38本/5cm
・ベルト層
プライ数:2枚
コード:1×3×0.27HT(スチール)
コード角:+20度/-20度
コード打込み数:40本/5cm
・バンド層
プライ数:1枚(フルバンド)
コード打込み数:40本/5cm
タイヤが17×7.0JJのリム、200kPaの内圧で乗用車(国産2000cc)の全輪に装着され、タイヤテストコースのドライアスファルト路面上においてゴツゴツ感、突き上げ、ダンピングに関して、10点法にてドライバーの官能評価が行われた。数値が大きいほど、性能が良好である。
ドラム走行試験機を用い、17×7.0JJのリム、200kPaの内圧、荷重(正規荷重)、速度60km/hの条件にて30000km走行させ、走行後タイヤを解体し、バンドコードの破断の有無が確認された。評価は、以下の通りである。
A:バンドコードの破断している箇所なし
B:バンドコードの破断している箇所が1箇所
C:バンドコードの破断している箇所が2箇所以上
ドラム試験機を用い、17×7.0JJのリム、200kPaの内圧の条件にて、ECE30により規定された荷重/速度性能テストに準拠し、ステップスピード方式により実施された。テストは、時速80km/hからスタートし、10分間走行毎に10km/hづつ速度を増加させ、タイヤが破壊するまでの走行距離が測定された。評価は、比較例1を100とする指数で表示されており、数値が大きいほど良好である。
タイヤ1本当たりの重量が測定され、比較例1を100とする指数で表示されている。指数は小さい方が良好である。
X/2:下撚りしたストランドXの2本を、上撚りにて互いに撚り合わせたコード
X/Y/2:下撚りしたストランドXの1本と、下撚りしたストランドYの1本とを、上撚りにて互いに撚り合わせたコード
X/1:下撚りした1本のストランドXからなるコード(片撚りコード)
X/X/Y/Y/4:下撚りしたストランドXの2本と、下撚りしたストランドYの2本との合計4本のストランドを上撚りにて互いに撚り合わせたコード
X/X/Y/3:下撚りしたストランドXの2本と、下撚りしたストランドYの1本との合計3本のストランドを上撚りにて互いに撚り合わせたコード
(X/2+Y/2)/2:下撚りしたストランドXの2本を撚り合せた1本の中間ストランドと、下撚りしたストランドYの2本を撚り合せた1本の中間ストランとを上撚りにて互いに撚り合わせたコード
(X+Y/2)/2:下撚りしたストランドXの1本と、下撚りしたストランドYの2本を撚り合せた1本の中間ストランとを上撚りにて互いに撚り合わせたコード
2 トレッド部
3 サイドウォール部
4 ビード部
6 カーカス
6A カーカスプライ
7 ベルト層
7A、7B ベルトプライ
9 バンド層
9A バンドプライ
15 バンドコード
16 トッピングゴム
17 ストリップ
18 ストランド
18A 第1のストランド
18B 第2のストランド
19 複合コード
20 剛性中子
21 加硫金型
Ka 生タイヤ形成工程
Kb 加硫工程
P 変曲点
YH 高弾性域
YL 低弾性域
Claims (4)
- トレッド部からサイドウォール部を通ってビード部に至るカーカスプライからなるカーカスと、このカーカスのタイヤ半径方向外側かつ前記トレッド部の内部に配されるベルトプライを含むベルト層と、前記ベルト層のタイヤ半径方向外側に配されるバンドプライを含むバンド層とを具える空気入りタイヤの製造方法であって、
剛性中子の外表面に、未加硫のカーカスプライとベルトプライとバンドプライとを含むタイヤ構成部材を順次貼り付けて生タイヤを形成する生タイヤ形成工程、及び、前記生タイヤを、前記剛性中子とともに加硫金型に投入して加硫成形する加硫工程を含み、
前記生タイヤ形成工程は、1本のバンドコード又は複数本のバンドコードを並列したバンドコード配列体がトッピングゴムで被覆されたリボン状のストリップを、前記ベルトプライの外側に螺旋状で巻き付けることによりバンドプライを形成するバンドプライ形成ステップを含み、
前記バンドコードは、アラミド繊維からなる第1のストランドと、熱収縮性の有機繊維からなる第2のストランドとを撚り合わせた複合コードからなり、
前記複合コードは、その応力-伸び曲線において、原点から変曲点に至る領域である低弾性域と、前記変曲点を越えた領域である高弾性域とを有し、
前記複合コードは、前記変曲点での伸びが0.9~3.3%の範囲であり、かつ、前記低弾性域でのモジュラスが11~31N/%であることを特徴とする空気入りタイヤの製造方法。 - 前記熱収縮性の有機繊維は、ナイロン、ポリエチレンテレフタレート(PET)又はポリエチレンナフタレート(PEN)である請求項1記載の空気入りタイヤの製造方法。
- 前記第1のストランドは、総繊度が2200dtex以下である請求項1又は2記載の空気入りタイヤの製造方法。
- 前記第2のストランドは、総繊度が1100dtex以下である請求項1乃至3のいずれかに記載の空気入りタイヤの製造方法。
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RU2014125193A RU2014125193A (ru) | 2012-01-20 | 2012-10-31 | Способ получения пневматической шины |
EP12865986.9A EP2783842B1 (en) | 2012-01-20 | 2012-10-31 | Method for manufacturing pneumatic tire |
BR112014017825A BR112014017825A8 (pt) | 2012-01-20 | 2012-10-31 | Método para fabricar um pneumático |
US14/367,307 US20150298408A1 (en) | 2012-01-20 | 2012-10-31 | Method for manufacturing pneumatic tire |
KR1020147020806A KR20140119045A (ko) | 2012-01-20 | 2012-10-31 | 공기 타이어의 제조 방법 |
CN201280064250.0A CN104023962A (zh) | 2012-01-20 | 2012-10-31 | 充气轮胎的制造方法 |
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JP2012010263A JP5261584B2 (ja) | 2012-01-20 | 2012-01-20 | 空気入りタイヤの製造方法 |
JP2012-010263 | 2012-01-20 |
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EP (1) | EP2783842B1 (ja) |
JP (1) | JP5261584B2 (ja) |
KR (1) | KR20140119045A (ja) |
CN (1) | CN104023962A (ja) |
BR (1) | BR112014017825A8 (ja) |
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Families Citing this family (14)
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US20170100964A1 (en) * | 2014-04-22 | 2017-04-13 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire, and pneumatic tire production method |
JP6093325B2 (ja) * | 2014-04-22 | 2017-03-08 | 住友ゴム工業株式会社 | 空気入りタイヤの製造方法、及び空気入りタイヤ |
JP2015212109A (ja) * | 2014-05-01 | 2015-11-26 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP6699183B2 (ja) * | 2016-01-08 | 2020-05-27 | 住友ゴム工業株式会社 | 空気入りタイヤの製造方法 |
JP6319409B1 (ja) * | 2016-12-09 | 2018-05-09 | 横浜ゴム株式会社 | 空気入りタイヤ |
US20200001507A1 (en) * | 2017-02-08 | 2020-01-02 | The Yokohama Rubber Co., Ltd. | Pneumatic Tire and Method of Manufacturing the Same |
US20200130310A1 (en) * | 2017-04-20 | 2020-04-30 | The Yokohama Rubber Co., Ltd. | Method for Producing Pneumatic Tires, Tire Mold, and Pneumatic Tires |
US20210155044A1 (en) * | 2017-12-22 | 2021-05-27 | Compagnie Generale Des Etablissements Michelin | Pneumatic tire comprising an improved bracing ply |
JP7119879B2 (ja) * | 2018-10-12 | 2022-08-17 | 住友ゴム工業株式会社 | 複合コード及びそれを用いたタイヤ |
FR3090494A3 (fr) * | 2018-12-19 | 2020-06-26 | Michelin & Cie | Pneumatique pour véhicule comprenant une structure de rigidification. |
FR3102095A1 (fr) * | 2019-10-16 | 2021-04-23 | Compagnie Generale Des Etablissements Michelin | Pneumatique a faible resistance au roulement et son procede de fabrication |
FR3103733B1 (fr) * | 2019-11-29 | 2022-08-19 | Michelin & Cie | Assemblage comprenant une structure porteuse adaptable |
JP7498025B2 (ja) | 2020-05-26 | 2024-06-11 | Toyo Tire株式会社 | 空気入りタイヤ |
CN114083940B (zh) * | 2021-11-30 | 2023-09-15 | 蓉驿时代科技有限公司 | 一种全方位防护自修复轮胎及其制备方法 |
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- 2012-10-31 WO PCT/JP2012/078187 patent/WO2013108464A1/ja active Application Filing
- 2012-10-31 KR KR1020147020806A patent/KR20140119045A/ko not_active Application Discontinuation
- 2012-10-31 BR BR112014017825A patent/BR112014017825A8/pt not_active IP Right Cessation
- 2012-10-31 RU RU2014125193A patent/RU2014125193A/ru unknown
- 2012-10-31 EP EP12865986.9A patent/EP2783842B1/en active Active
- 2012-10-31 CN CN201280064250.0A patent/CN104023962A/zh active Pending
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BR112014017825A2 (ja) | 2017-06-20 |
JP2013146954A (ja) | 2013-08-01 |
CN104023962A (zh) | 2014-09-03 |
EP2783842A4 (en) | 2015-07-01 |
JP5261584B2 (ja) | 2013-08-14 |
RU2014125193A (ru) | 2016-03-20 |
KR20140119045A (ko) | 2014-10-08 |
EP2783842A1 (en) | 2014-10-01 |
BR112014017825A8 (pt) | 2017-07-11 |
US20150298408A1 (en) | 2015-10-22 |
EP2783842B1 (en) | 2017-01-18 |
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