WO2013108537A1 - Noyau rigide pour formation de pneu - Google Patents

Noyau rigide pour formation de pneu Download PDF

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Publication number
WO2013108537A1
WO2013108537A1 PCT/JP2012/082953 JP2012082953W WO2013108537A1 WO 2013108537 A1 WO2013108537 A1 WO 2013108537A1 JP 2012082953 W JP2012082953 W JP 2012082953W WO 2013108537 A1 WO2013108537 A1 WO 2013108537A1
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WO
WIPO (PCT)
Prior art keywords
tire
core
exhaust groove
tread
molding surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/082953
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English (en)
Japanese (ja)
Inventor
圭 小原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Priority to CN201280016953.6A priority Critical patent/CN103459131B/zh
Publication of WO2013108537A1 publication Critical patent/WO2013108537A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29D30/12—Cores

Definitions

  • the present invention relates to a rigid core for forming a tire in which exhaust grooves are formed on a mating surface of core segments.
  • the rigid core includes a core body having an outer shape that matches a shape of a tire lumen surface of a vulcanized tire. And a raw tire is formed by affixing a tire structural member on this core main body one by one. This green tire is put together with a rigid core into a vulcanization mold, and is thereby sandwiched between an inner core body and an outer vulcanization mold so that the green tire is vulcanized. Molded.
  • the core body a in order to disassemble and remove the core body a from the tire after vulcanization, is divided into a plurality of core segments c divided in the circumferential direction. It is configured.
  • the core main body a is formed in an annular shape by setting both end surfaces in the circumferential direction of each core segment c as mating surfaces cs and adjoining the mating surfaces cs and cs adjacent in the circumferential direction.
  • an exhaust groove d be provided in at least one of the mating surfaces cs of the core segment c as shown in FIG. 7B.
  • the exhaust groove d it is desired to reduce the cross-sectional volume as much as possible to suppress the inflow of rubber.
  • the exhaust performance is also lowered, and the tire has a sufficiently satisfactory effect such as causing deformation due to air accumulation. I can't get it.
  • each core segment is further divided into side segment pieces on both sides in the tire axial direction and intermediate segment pieces therebetween, and an exhaust passage for exhausting air is formed between the divided surfaces. It has been proposed.
  • the side segment piece and the intermediate segment piece are integrally connected by a bolt.
  • the strength of the connecting portion becomes insufficient and the durability of the core segment is lowered.
  • the inflow of rubber into the exhaust passage is still not taken into consideration.
  • An object of the present invention is to provide a rigid core for forming a tire.
  • the invention of claim 1 of the present application includes an annular core body having a core-side tire molding surface for forming a green tire on the outer surface, and the raw tire is placed in a vulcanization mold.
  • the vulcanization mold includes a tread mold that can move in and out of the tire radial direction, and a side mold that can move in and out of the tire axial direction,
  • the tread mold has a mold side tread molding surface portion that molds the outer surface of the tire tread by being pressed against the raw tire,
  • the side mold has a mold side side molding surface part for molding the side outer surface of the tire by being pressed against the raw tire,
  • the core side tire molding surface is a normal line extending in a direction perpendicular to the core side tire molding surface through a boundary position between the mold side tread molding surface portion and the mold side side molding surface portion.
  • the core body is composed of a plurality of core segments divided in the circumferential direction, Each of the core segments forms an annular core body by attaching the circumferentially adjacent mating surfaces to each other with the circumferential ends of the core segment as mating surfaces.
  • the exhaust groove has an opening end that opens at the core-side tire molding surface, and exhausts air between the core-side tire molding surface and the raw tire from the opening end to the inside of the core body
  • the exhaust groove includes a tread exhaust groove whose opening end opens at the core-side tread molding surface portion and / or a side exhaust groove which opens at the core-side side molding surface portion
  • the tread exhaust groove has an inclined groove portion extending at an angle ⁇ 1 with respect to the tire radial direction line from the opening end
  • the side exhaust groove has an inclined groove portion that extends at an angle ⁇ 2 with respect to the tire axial direction line from the opening end.
  • the angle ⁇ 1 of the tread exhaust groove is in the range of 30 to 80 °
  • the angle ⁇ 2 of the side exhaust groove is in the range of 30 to 80 °.
  • the exhaust groove includes the tread exhaust groove and a side exhaust groove
  • the tread exhaust groove includes a tread exhaust groove whose opening end is disposed at a tire equator position
  • the exhaust groove includes a side exhaust groove in which the opening end is disposed at the maximum width position in the tire axial direction of the core side side molding surface portion.
  • the exhaust groove has a groove cross-sectional area perpendicular to the length direction of 0.03 mm 2 or less.
  • an exhaust groove is recessed in at least one of the mating surfaces of the core segments adjacent in the circumferential direction.
  • the exhaust groove includes a tread exhaust groove having an open end in the core side tread molding surface portion and / or a side exhaust groove having an open end in the core side side molding surface portion.
  • the tread exhaust groove has an inclined groove portion extending from the opening end thereof at an angle ⁇ 1 with respect to the tire radial direction line.
  • the side exhaust groove has an inclined groove portion extending from the opening end thereof at an angle ⁇ 2 with respect to the tire axial direction line.
  • the vulcanization mold includes a tread mold that can move in and out of the tire radial direction and a side mold that can move in and out of the tire axial direction.
  • the rubber of the raw tire is strongly pressed inward in the tire radial direction by the tread mold at a portion where the rubber comes into contact with the tread mold. Therefore, if the opening end side of the tread exhaust groove extends along the tire radial direction, the direction of the strong pressing force by the tread mold matches the direction of the exhaust groove. For this reason, the rubber easily flows into the exhaust groove.
  • the rubber of the raw tire is strongly pressed inward in the tire axial direction by the side mold at the portion that comes into contact with the side mold. Therefore, if the opening end side of the side exhaust groove extends along the tire axial direction, the direction of the strong pressing force by the side mold coincides with the direction of the exhaust groove. For this reason, the rubber easily flows into the exhaust groove.
  • the opening end side portions of the tread exhaust groove and the side exhaust groove are inclined at the angles ⁇ 1 and ⁇ 2, respectively. That is, the portion on the opening end side extends in a direction different from the strong pressing force. Therefore, it is possible to suppress only the inflow of rubber without hindering the inflow of air. This occurs because the rubber has a much higher viscosity than air.
  • the opening end side portion of the exhaust groove different from the direction in which a strong pressing force is applied, the difference in the direction becomes resistance, and the inflow of high viscosity rubber can be suppressed. Moreover, it does not become resistance to air with low viscosity, and the inflow is not hindered. Therefore, the exhaust performance can be exhibited effectively.
  • the amount of rubber adhering to the wall surface of the exhaust groove increases with an increase in the number of vulcanizations, and exhaust failure due to the exhaust groove being blocked can be suppressed.
  • frequent cleaning of the intermediate segment pieces is not necessary, continuous production for a long time is possible.
  • no thick spew is generated on the inner surface of the product tire, the tire quality can be maintained high.
  • FIG. 1 It is sectional drawing which shows the use condition of one Example of the rigid core of this invention.
  • (A), (B) is the perspective view and side view of a core main body.
  • (A), (B) is the perspective view and front view which show the mating surface of a core segment with an exhaust groove.
  • (A) to (D) are cross-sectional views illustrating the cross-sectional shape of the exhaust groove.
  • (A), (B) is the perspective view which shows the other Example of a core segment, and a front view.
  • (A), (B) is the perspective view and front view which show other Example of a core segment.
  • (A) is a side view which shows the conventional core main body
  • (B) is a perspective view which shows exhaust grooves other than this invention.
  • the rigid core 1 of the present embodiment includes an annular core body 2 having a core-side tire molding surface 2S on the outer surface.
  • a known tire component such as a carcass ply, a belt ply, sidewall rubber, and tread rubber is sequentially attached onto the core-side tire molding surface 2S, thereby forming a green tire T having substantially the same shape as the finished tire. Is done.
  • the raw tire T is put into the vulcanizing mold 20 together with the rigid core 1.
  • the green tire T is heated and pressurized between the core body 2 that is the inner mold and the vulcanization mold 20 that is the outer mold, and vulcanized.
  • the vulcanizing mold 20 has a conventional well-known structure, and includes a tread mold 21 that can move in and out in the tire radial direction and side molds 22 and 22 that can move in and out in the tire axial direction.
  • the tread mold 21 has a mold side tread molding surface portion 21S.
  • the tread outer surface Ta of the tire T is molded by pressing the mold side tread molding surface portion 21S toward the inner side in the tire radial direction.
  • the side mold 22 has a mold side molding surface portion 22S.
  • the side outer surface Tb of the tire T is molded by pressing the mold side molding surface portion 22S inward in the tire axial direction.
  • the rigid core 1 includes the annular core body 2 and a cylindrical core 3 inserted into the center hole 2H.
  • a conventional well-known structure can be adopted. Therefore, only the core body 2 will be described below.
  • the core body 2 includes the core-side tire molding surface 2S on the outer surface thereof, which is substantially the same shape as the inner surface shape of the finished tire.
  • the core side tire molding surface 2S is virtually divided into a core side tread molding surface portion 2Sa and a core side side molding surface portion 2Sb by a normal line N.
  • the normal line N is defined as a straight line extending in a direction orthogonal to the core-side tire molding surface 2S through a boundary position P between the mold-side tread molding surface portion 21S and the mold-side side molding surface portion 22S.
  • the part between the said normal lines N and N among the core side tire molding surfaces 2S is defined as the core side tread molding surface part 2Sa.
  • the portion outside the normal line N is defined as the core side side molding surface portion 2Sb.
  • the core body 2 has a hollow shape with a lumen 4 extending continuously in the circumferential direction, for example.
  • a heating means such as an electric heater for heating the raw tire T inside is disposed in the lumen 4.
  • the core body 2 is formed of a plurality of core segments 5 divided in the circumferential direction, as shown in FIGS. 2 (A) and 2 (B).
  • Each core segment 5 has both end surfaces in the circumferential direction as mating surfaces 6, and the mating surfaces 6, 6 adjacent in the circumferential direction are attached to each other, whereby the annular core body 2 is formed.
  • the core segment 5 is composed of first and second core segments 5A and 5B that are alternately arranged in the circumferential direction.
  • the mating surface 6 of the first core segment 5A is inclined in the direction in which the circumferential width decreases toward the inside in the radial direction.
  • the mating surface 6 of the second core segment 5B is inclined in a direction in which the circumferential width increases inward in the radial direction. Thereby, it can move to the inner side in the radial direction sequentially from the second core segment 5B, and can be sequentially taken out from the bead hole of the finished tire T after vulcanization molding.
  • the core 3 prevents the core segments 5 from moving inward in the radial direction and connects the core segments 5 together.
  • At least one exhaust groove 11 is recessed on at least one of the mating surfaces 6 adjacent in the circumferential direction, as shown in FIGS.
  • the exhaust groove 11 has an opening end 12 that opens at the core-side tire molding surface 2S.
  • the air between the core side tire molding surface 2S and the raw tire T is exhausted from the opening end 12 through the exhaust groove 11 to the inside of the core body 2.
  • the other end of the exhaust groove 11 communicates with the lumen portion 4 in this example, and the lumen portion 4 conducts to the outside air.
  • the exhaust groove 11 includes a tread exhaust groove 11A whose opening end 12 opens at the core side tread molding surface portion 2Sa and / or a side exhaust groove 11B which opens at the core side side molding surface portion 2Sb.
  • the exhaust groove 11 is formed of a tread exhaust groove 11A and a side exhaust groove 11B. More preferably, the tread exhaust groove 11A includes an equatorial tread exhaust groove 11Ac, and the side exhaust groove 11B includes a maximum width position side exhaust groove 11Bq.
  • the tread exhaust groove 11Ac at the equator position means the tread exhaust groove 11A in which the opening end 12 is disposed at the position of the tire equator Co.
  • the side exhaust groove 11Bq at the maximum width position means the side exhaust groove 11B in which the opening end 12 is disposed at the maximum width position Q in the tire axial direction of the core side side molding surface portion 2Sb.
  • the exhaust groove 11 is composed of one tread exhaust groove 11A and two side exhaust grooves 11B, and this one tread exhaust groove 11A is formed as a tread exhaust groove 11Ac at the equator position. Moreover, the case where the two side exhaust grooves 11B are formed as the side exhaust grooves 11Bq at the maximum width position is shown.
  • the tread exhaust groove 11A has an inclined groove portion 13 extending from the opening end 12 at an angle ⁇ 1 with respect to the tire radial direction line.
  • the side exhaust groove 11B has an inclined groove portion 14 extending from the opening end 12 with an angle ⁇ 2 with respect to the tire axial direction line.
  • the tread exhaust groove 11A includes the inclined groove portion 13 on the opening end 12 side, and the inclined groove portion 13 is inclined at an angle ⁇ 1 with respect to the tire radial direction which is a direction of a strong pressing force by the tread mold 21. Therefore, the angle ⁇ 1 becomes a resistance, and the inflow of rubber having a high viscosity can be suppressed.
  • the side exhaust groove 11B includes an inclined groove portion 14 on the opening end 12 side, and the inclined groove portion 14 is inclined at an angle ⁇ 2 with respect to the tire axial direction that is a direction of a strong pressing force by the side mold 22. Therefore, the angle ⁇ 2 becomes a resistance, and the inflow of rubber having a high viscosity can be suppressed.
  • the angles ⁇ 1 and ⁇ 2 are each preferably in the range of 30 to 80 °. If the angles [theta] 1 and [theta] 2 are less than 30 [deg.], The resistance becomes small and the rubber inflow suppressing effect cannot be sufficiently achieved. Conversely, when it exceeds 80 °, the intersection of the core-side tire molding surface 2S and the exhaust groove 11 has a sword tip shape. As a result, the crossing portion is insufficient in strength, which may lead to a decrease in durability. From such a viewpoint, the lower limit values of the angles ⁇ 1 and ⁇ 2 are more preferably 45 ° or more, and the upper limit value is more preferably 70 ° or less.
  • the entire length can be formed only by the inclined groove portion 14 as in the side exhaust groove 11B of this example. Further, like the tread exhaust groove 11 ⁇ / b> A of this example, it can also be formed in a bent groove shape including an inclined groove portion 13 and a joint groove portion 15 connected to the inclined groove portion 13.
  • the joint groove portion 15 is formed, it is not particularly restricted, but it is preferably formed at the shortest distance toward the inside of the core body 2 (in this example, the lumen portion 4).
  • Examples of the groove cross-sectional shape perpendicular to the length direction of the exhaust groove 11 include, for example, a cross-sectional triangle shape (FIG. 4A), a cross-sectional square shape (FIGS. 4B and 4C), and a semicircular arc shape (FIG. 4 (D)) can be employed.
  • the cross-sectional triangle shape is preferable from the viewpoint of workability.
  • a triangular cross section an isosceles triangular shape is preferable to an equilateral triangle with less rubber inflow when the cross sectional area is the same.
  • the base m1 is the opening side and is shorter than the other oblique sides m2 in order to stably suppress the inflow of rubber.
  • a rectangular shape is more suitable than a square when the cross-sectional area is the same. This is preferable.
  • the groove cross-sectional area is preferably 0.03 mm 2 .
  • the lower limit of the groove cross-sectional area is preferably 0.02 mm 2 or more.
  • the exhaust groove 11 may be provided on at least one of the mating surfaces 6 adjacent in the circumferential direction. In addition, when forming the exhaust groove 11 in both the mating surfaces 6, it is preferable to make the position of the opening end 12 mutually different.
  • FIGS. 5 and 6 show another embodiment of the core segment 5.
  • the end surfaces 18 on both sides in the circumferential direction of the core segment 5 include an edge surface portion 18A along the outer periphery, and a recessed surface portion 18B surrounded by the edge surface portion 18A and recessed from the edge surface portion 18A in a step shape. It is formed as a stepped surface.
  • the mating surface 6 is constituted by the edging surface portion 18A.
  • the exhaust groove 11 is formed in the edge surface portion 18A.
  • the other end of the exhaust groove 11 is electrically connected to the recessed surface portion 18B, and the recessed surface portion 18B is electrically connected to the outside air.
  • the core segment 5 has the entire end face 18 on both sides in the circumferential direction as the mating face 6.
  • the other end of the exhaust groove 11 communicates with the radially inner end 18e of the end face 18, and the radially inner end 18e is electrically connected to the outside air.
  • a core body for forming a pneumatic tire having a tire size of 195 / 65R15 was prototyped based on the specifications shown in Table 1. And when a pneumatic tire is formed using this core body, the rubber flows into the exhaust groove, the seized state in which the rubber that has flowed in adheres to the groove wall surface, and the exhaust performance decreases due to seizure. The state of occurrence of air pockets was evaluated.
  • a green tire is formed on the core body at room temperature (20 ° C.).
  • the inside of the vulcanization mold is heated to a high temperature of 150 ° C. Except as described in Table 1, the specifications are substantially the same.
  • the test method was as follows, and each evaluation was performed in the tread exhaust groove at the equator position.
  • Rubber flowing in The amount of spew (rubber amount) generated on the tire side by the inflow of rubber into the exhaust groove is compared. Specifically, vulcanization was carried out 1000 times continuously, and the amounts of spews at the first, 300th, 600th, and 1000th times were quantified and evaluated. A numerical value shows that there are few inflows and it is so favorable that it is large.
  • Burn-in condition The amount of seizure of the rubber that has flowed into the exhaust groove and sticks to the groove wall surface is compared. Specifically, vulcanization was performed continuously 1000 times, and the amount of seizure in the first, 300th, 600th, and 1000th times was quantified and evaluated. The larger the numerical value, the smaller the amount of image sticking and the better.
  • Air accumulation occurrence state The state of occurrence of air pockets due to the rubber sticking to the groove wall surface due to seizure and lowering the exhaust performance is compared. Specifically, vulcanization was continuously performed 1000 times, and the deformation state of the tire caused by air accumulation was numerically evaluated in each of the first, 300th, 600th, and 1000th times. The larger the numerical value, the better the less air accumulation.
  • the rigid core of the example is provided with an inclined groove portion of a predetermined angle in the exhaust groove, so that the rubber can be prevented from flowing into the exhaust groove, and the occurrence of spew on the tire. It can be confirmed that the seizure of rubber in the exhaust groove and the clogging of the exhaust groove due to this can be effectively suppressed. Further, it can be confirmed that the groove cross-sectional shape is excellent in the order of FIG. 4 (A)> FIG. 4 (B)> FIG. 4 (D) ⁇ FIG.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Tyre Moulding (AREA)

Abstract

Afin de supprimer l'apport de caoutchouc à une rainure d'évacuation, un corps de noyau comprend une pluralité de segments de noyau divisés dans la direction circonférentielle, et des rainures d'évacuation présentant une extrémité ouverte s'ouvrant dans une face de moulage de pneu côté noyau sont disposées sur la face d'accouplement d'au moins un des segments de noyau adjacents dans la direction circonférentielle. La rainure d'évacuation comprend une rainure d'évacuation de bande de roulement, dont l'extrémité ouverte s'ouvre dans une partie d'une face de moulage de bande de roulement côté noyau, et/ou une rainure d'évacuation latérale qui s'ouvre dans une partie d'une face de moulage latérale côté noyau. La rainure d'évacuation de bande de roulement présente une partie rainure inclinée s'étendant à un angle (θ1) par rapport à la direction radiale du pneu à partir de l'extrémité ouverte, et la rainure d'évacuation latérale présente une partie rainure inclinée s'étendant à un angle (θ2) par rapport à la direction axiale du pneu à partir de l'extrémité ouverte.
PCT/JP2012/082953 2012-01-18 2012-12-19 Noyau rigide pour formation de pneu Ceased WO2013108537A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201280016953.6A CN103459131B (zh) 2012-01-18 2012-12-19 轮胎形成用刚性型芯

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012008423A JP5444385B2 (ja) 2012-01-18 2012-01-18 タイヤ形成用の剛性中子
JP2012-008423 2012-01-18

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WO2013108537A1 true WO2013108537A1 (fr) 2013-07-25

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CN (1) CN103459131B (fr)
WO (1) WO2013108537A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP2823955A4 (fr) * 2012-03-07 2016-01-27 Sumitomo Rubber Ind Noyau rigide pour la formation de pneumatique
EP3308925A4 (fr) * 2015-06-09 2018-05-30 Bridgestone Corporation Moule pour article en caoutchouc et procédé de production de moule pour article en caoutchouc
US11702555B2 (en) 2014-11-12 2023-07-18 The Yokohama Rubber Co., Ltd. Pneumatic tire, manufacturing device for pneumatic tire, and method of manufacturing pneumatic tire

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JP6242146B2 (ja) * 2013-10-10 2017-12-06 住友ゴム工業株式会社 タイヤ形成用の剛性中子、及びそれを用いたタイヤ製造方法
JP6251084B2 (ja) * 2014-03-07 2017-12-20 住友ゴム工業株式会社 タイヤ形成用の剛性中子
JP6212413B2 (ja) * 2014-03-07 2017-10-11 住友ゴム工業株式会社 タイヤ形成用の剛性中子
JP6586767B2 (ja) * 2015-04-23 2019-10-09 横浜ゴム株式会社 空気入りタイヤの製造装置及び製造方法
JP6374779B2 (ja) * 2014-12-01 2018-08-15 住友ゴム工業株式会社 タイヤ形成用の剛性中子
WO2018061050A1 (fr) * 2016-09-28 2018-04-05 東洋ゴム工業株式会社 Moule de vulcanisation de pneu
CN108162256B (zh) * 2017-12-29 2020-05-22 山东豪迈机械科技股份有限公司 一种轮胎模具侧板及轮胎模具
CN108099235B (zh) * 2017-12-29 2020-07-07 山东豪迈机械科技股份有限公司 一种轮胎模具侧板及轮胎模具
CN108016058B (zh) * 2017-12-29 2020-06-19 山东豪迈机械科技股份有限公司 一种轮胎模具侧板及轮胎模具
CN108582828B (zh) * 2018-05-18 2020-07-07 山东豪迈机械科技股份有限公司 一种轮胎模具侧板、轮胎模具及加工方法
JP6741097B1 (ja) * 2019-02-25 2020-08-19 横浜ゴム株式会社 タイヤ加硫装置および方法
TWI684539B (zh) * 2019-03-06 2020-02-11 特耐橡膠工業有限公司 具有胎面排氣溝之輪胎及其成型模具
JP7234751B2 (ja) * 2019-04-03 2023-03-08 住友ゴム工業株式会社 タイヤ加硫方法及びタイヤ加硫装置
CN111391278B (zh) * 2020-03-13 2022-02-18 淮阴工学院 一种汽车地毯生产用模具及其使用方法
CN111361132B (zh) * 2020-03-13 2022-02-18 淮阴工学院 一种用于汽车地毯生产的模具及其使用方法
CN111361062B (zh) * 2020-04-24 2025-09-02 正新橡胶（中国）有限公司 一种轮胎模具

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Publication number Priority date Publication date Assignee Title
EP2823955A4 (fr) * 2012-03-07 2016-01-27 Sumitomo Rubber Ind Noyau rigide pour la formation de pneumatique
US11702555B2 (en) 2014-11-12 2023-07-18 The Yokohama Rubber Co., Ltd. Pneumatic tire, manufacturing device for pneumatic tire, and method of manufacturing pneumatic tire
EP3308925A4 (fr) * 2015-06-09 2018-05-30 Bridgestone Corporation Moule pour article en caoutchouc et procédé de production de moule pour article en caoutchouc
US10486339B2 (en) 2015-06-09 2019-11-26 Bridgestone Corporation Rubber article mold and method for manufacturing rubber article mold

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