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MarketScreener Homepage  >  Equities  >  Tokyo  >  Sumitomo Rubber Industries Ltd    5110   JP3404200002

SUMITOMO RUBBER INDUSTRIES LTD

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Japan - Patent Issued for Tire Vulcanizing Apparatus (USPTO 10,363,713): Sumitomo Rubber Industries Ltd.

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08/14/2019 | 05:21pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Daily Asia Business -- A patent by the inventor Tanaka, Takashi (Kobe, Japan), filed on September 5, 2017, was published online on August 12, 2019, according to news reporting originating from Alexandria, Virginia, by NewsRx correspondents.

Patent number 10,363,713 is assigned to Sumitomo Rubber Industries Ltd. (Kobe-shi, Hyogo, Japan).

The following quote was obtained by the news editors from the background information supplied by the inventors: “Conventionally, a tire vulcanizing apparatus for vulcanizing an unvulcanized tire by using a vulcanizing bladder is known. In this type of tire vulcanizing apparatus, for example, a heated fluid is supplied into the vulcanizing bladder to inflate the vulcanizing bladder.

“For such fluid, steam is used from a point of view of cost and heat transfer performance, for example. However, when heat is transferred to the unvulcanized tire via the vulcanizing bladder, the steam is condensed to become drain and it is possible that the drain stays in the vulcanizing bladder.

“Drain like this decreases temperature of the unvulcanized tire at a part in contact with the drain of the bladder relative to the temperature of the other part of the unvulcanized tire. Therefore, vulcanization unevenness occurs, which tends to cause imbalance in physical properties and performance of the tire. Further, such temperature decrease is also a cause of deteriorating the productivity because longer time is needed to vulcanize the tire.

“For example, Japanese Unexamined Patent Application Publication No. 2010-110970 (Patent Document 1) has proposed a tire vulcanizing apparatus that diffuses steam and sequentially supplies steam to an entire inside of a vulcanizing bladder thereof. In the tire vulcanizing apparatus of Patent Document 1, even if the drain stays in the vulcanizing bladder, the temperature of the drain is increased by the steam that is sequentially supplied, and the temperature difference of the unvulcanized tire is decreased.”

In addition to the background information obtained for this patent, NewsRx journalists also obtained the inventor’s summary information for this patent: “However, since the tire vulcanizing apparatus of Patent Document 1 sequentially supplies steam to the entire inside of the vulcanizing bladder, it requires a lot of energy. Further, this tire vulcanizing apparatus does not solve the problem of the drain staying in a lower part of the vulcanizing bladder.

“In view of the above, the inventor of the present invention has proposed to provide a vulcanizing bladder with a double structure and supply steam between inner and outer bladders thereof. Thereby, a space to which the steam is supplied becomes small, therefore, it is less likely that drain is generated. Further, even when drain is generated, the generated amount of drain becomes small, therefore, it is easy to discharge the drain. Thereby, temperature distribution is made uniform on a circumference of the tire, therefore, it is possible that uneven vulcanization is suppressed.

“However, when the vulcanizing bladder has a double structure, it is possible that the inner and the outer bladders come into contact with each other due to pressure balance and the like. When it actually happens, a path of the steam as a heat source is partially blocked, therefore, unevenness in the temperature distribution is induced. Further, the contact of the inner and the outer bladders hinders the discharge of the drain. Thereby, it is possible that an effect of suppressing vulcanization unevenness by the double structure is not sufficiently exerted.

“A primary object of the present invention is to provide a tire vulcanizing apparatus having a vulcanizing bladder with a double structure which can suppress defects in fluid flow and drainage due to partial contact between an inner and an outer bladders thereof, and can exert an effect of suppressing vulcanization unevenness due to the double structure at a higher level.

“In one aspect of the present invention, a tire vulcanizing apparatus comprises a vulcanizing bladder inflatable in an inner space of an unvulcanized tire to press the unvulcanized tire against a vulcanizing mold, a center device for holding the vulcanizing bladder, a supplier for supplying fluid to the vulcanizing bladder, a discharger for discharging the fluid in the vulcanizing bladder, the vulcanizing bladder comprising a first bladder configured to contact with an inner circumferential surface of the unvulcanized tire and a second bladder arranged inside the first bladder, the fluid including a first fluid to be supplied between the first bladder and the second bladder and a second fluid to be supplied to an inside of the second bladder, and at least one of an inner circumferential surface of the first bladder and an outer circumferential surface of the second bladder being provided with a guide groove extending in a tire axial direction.

“In another aspect of the invention, it is preferred that the guide groove has a groove depth (H) in a range of from 2 to 10 mm and a groove width (w) in a range of from 2 to 20 mm.

“In another aspect of the invention, it is preferred that the first bladder and the second bladder each have a tubular shape with upper and lower openings, and the center device comprises a lower flange portion holding each of lower end portions of the first bladder and the second bladder, a center post capable of moving up and down relative to the lower flange portion, and an upper flange portion provided at an upper end portion of the center post and holding each of upper end portions of the first bladder and the second bladder.

“In another aspect of the invention, it is preferred that the supplier comprises a first supplier for supplying the first fluid and a second supplier for supplying the second fluid, the first supplier is arranged at the upper flange portion and provided with a first supply port having an opening between the upper end portion of the first bladder and the upper end portion of the second bladder, the second supplier is arranged at the lower flange portion and provided with a second supply port having an opening located on an inner side in the tire axial direction of the lower end portion of the second bladder.

“In another aspect of the invention, it is preferred that the discharger is provided with a first discharge port arranged at the lower flange portion and having an opening between the lower end portion of the first bladder and the lower end portion of the second bladder.

“In another aspect of the invention, it is preferred that a circulation path is formed in which the first fluid continuously flows during vulcanization process from the first supply port to the first discharge port through a space between the first bladder and the second bladder.

“In the tire vulcanizing apparatus of the present invention, the vulcanizing bladder has a double structure including the first bladder and the second bladder, and the first fluid, which is steam for example, is to be supplied between the first bladder and the second bladder.

“Thereby, a space to which the first fluid is to be supplied becomes small, therefore, it is less likely that the drain is generated. Further, even when the drain is generated, the generated amount of the drain becomes small, therefore, it is easy to discharge the drain. Thereby, a partial temperature decrease due to the drain is suppressed and the temperature distribution is made uniform on a circumference of the tire, therefore, it is possible that uneven vulcanization is suppressed.

“Further, at least one of the inner circumferential surface of the first bladder and the outer circumferential surface of the second bladder is provided with the guide groove extending in the tire axial direction, therefore, it is possible that a gap is always secured between the first bladder and the second bladder during vulcanization process. Thereby, it is possible that flow failure of the first fluid and discharge failure of the drain due to partial blockage of the gap are suppressed, therefore, it is possible that the flow of the first fluid and the discharge of the drain are made smooth. As a result, it is possible that effect of suppressing the vulcanization unevenness due to the double structure is exerted at a higher level.”

The claims supplied by the inventors are:

“The invention claimed is:

“1. A tire vulcanizing apparatus comprising: a vulcanizing bladder inflatable in an inner space of an unvulcanized tire to press the unvulcanized tire against a vulcanizing mold; a center device for holding the vulcanizing bladder; a supplier for supplying fluid to the vulcanizing bladder; a discharger for discharging the fluid in the vulcanizing bladder; the vulcanizing bladder comprising a first bladder configured to contact with an inner circumferential surface of the unvulcanized tire and a second bladder arranged inside the first bladder, the fluid including a first fluid to be supplied between the first bladder and the second bladder and a second fluid to be supplied to an inside of the second bladder, and at least one of an inner circumferential surface of the first bladder and an outer circumferential surface of the second bladder being provided with a guide groove extending in a tire axial direction.

“2. The tire vulcanizing apparatus according to claim 1, wherein the guide groove has a groove depth (H) in a range of from 2 to 10 mm and a groove width (W) in a range of from 2 to 20 mm.

“3. The tire vulcanizing apparatus according to claim 1, wherein the first bladder and the second bladder each have a tubular shape with upper and lower openings, and the center device comprises a lower flange portion holding each of lower end portions of the first bladder and the second bladder, a center post capable of moving up and down relative to the lower flange portion, and an upper flange portion provided at an upper end portion of the center post and holding each of upper end portions of the first bladder and the second bladder.

“4. The tire vulcanizing apparatus according to claim 3, wherein the supplier comprises a first supplier for supplying the first fluid and a second supplier for supplying the second fluid, the first supplier is arranged at the upper flange portion and provided with a first supply port having an opening between the upper end portion of the first bladder and the upper end portion of the second bladder, the second supplier is arranged at the lower flange portion and provided with a second supply port having an opening located on an inner side in the tire axial direction of the lower end portion of the second bladder.

“5. The tire vulcanizing apparatus according to claim 3, wherein the discharger is provided with a first discharge port arranged at the lower flange portion and having an opening between the lower end portion of the first bladder and the lower end portion of the second bladder.

“6. The tire vulcanizing apparatus according to claim 2, wherein the first bladder and the second bladder each have a tubular shape with upper and lower openings, and the center device comprises a lower flange portion holding each of lower end portions of the first bladder and the second bladder, a center post capable of moving up and down relative to the lower flange portion, and an upper flange portion provided at an upper end portion of the center post and holding each of upper end portions of the first bladder and the second bladder.

“7. The tire vulcanizing apparatus according to claim 4, wherein the discharger is provided with a first discharge port arranged at the lower flange portion and having an opening between the lower end portion of the first bladder and the lower end portion of the second bladder.

“8. The tire vulcanizing apparatus according to claim 7, wherein a circulation path is formed in which the first fluid continuously flows during vulcanization process from the first supply port to the first discharge port through a space between the first bladder and the second bladder.”

URL and more information on this patent, see: Tanaka, Takashi. Tire Vulcanizing Apparatus. U.S. Patent Number 10,363,713, filed September 5, 2017, and published online on August 12, 2019. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=10,363,713.PN.&OS=PN/10,363,713RS=PN/10,363,713

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Daily Asia Business, source Geographic Newsletters

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EBIT 2019 53 103 M
Net income 2019 33 975 M
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P/E ratio 2020 8,62x
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