JP2007062235A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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Publication number
JP2007062235A
JP2007062235A JP2005252963A JP2005252963A JP2007062235A JP 2007062235 A JP2007062235 A JP 2007062235A JP 2005252963 A JP2005252963 A JP 2005252963A JP 2005252963 A JP2005252963 A JP 2005252963A JP 2007062235 A JP2007062235 A JP 2007062235A
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Prior art keywords
vent
vent piece
porous body
porous
mold
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JP2005252963A
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Japanese (ja)
Inventor
Noriyuki Wakai
敬之 若井
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Application filed by Toyo Tire and Rubber Co Ltd filed Critical Toyo Tire and Rubber Co Ltd
Priority to JP2005252963A priority Critical patent/JP2007062235A/en
Publication of JP2007062235A publication Critical patent/JP2007062235A/en
Pending 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)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B29D2030/0614—Constructional features of the moulds porous moulds, e.g. sintered materials
    • 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
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B29D2030/0617—Venting devices, e.g. vent plugs or inserts

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vent piece which enables elimination of a trimming work, without lowering the maintenance performance of a die. <P>SOLUTION: The vent piece 1 which is attached to a molding die for molding a tire is provided with a venthole 2 from one end of a vent piece main body 1 and a recessed part 3 communicating the venthole 2 from the other end of it, the recessed part 3 being inserted with a porous body 4. A pore diameter of the porous body 4 is preferably 5-100 μm and a length L1 of the venthole 2 is preferably not greater than 5 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、タイヤを加硫成型する際に、タイヤ表面に形成されるベントスピューの長さを調整し、ベントスピューを切断する作業（トリミング）を省略可能としたベントピースに関する。   The present invention relates to a vent piece that adjusts the length of a vent spew formed on the surface of a tire when the tire is vulcanized and can omit the work (trimming) of cutting the vent spew.

空気入りタイヤを加硫成型する際、金型とタイヤとの間に空気が溜まってしまうことがある。溜まった空気によりトレッドが所望のパターンに成型されず、ライトと呼ばれる製造不良が発生することがあった。そのため、金型のタイヤ成型面にベントホールと呼ばれる多数の孔を設け、金型内に溜まった空気を排出させて、ライトの発生を防止していた。通常、予めベントホールを設けたベントピースと呼ばれる部品を金型に取り付けられている。   When vulcanizing a pneumatic tire, air may accumulate between the mold and the tire. The tread was not formed into a desired pattern due to the accumulated air, and a manufacturing defect called “light” sometimes occurred. Therefore, a large number of holes called vent holes are provided on the tire molding surface of the mold, and air accumulated in the mold is discharged to prevent generation of light. Usually, a part called a vent piece provided with a vent hole in advance is attached to a mold.

しかし、空気を排出する過程で、ベントホールにゴムの一部が進入し、ベントスピューと呼ばれる髭状のゴムがタイヤの表面に形成される。ベントスピューは、１０ｍｍ以上、場合によっては２０ｍｍ以上の長さを有しているので、外観品質上の問題となっていた。そのため、加硫成型後、ベントスピューを切断し、この問題を解決していた。製造工程が増え、コスト増を招いていた。特に、ベントスピューの径が０．４ｍｍ以下になると、トリミングを自動化することが困難なため手作業でトリミングを行なう必要があり、一層のコスト増を招いていた。   However, in the process of exhausting air, part of the rubber enters the vent hole, and a hook-like rubber called a vent spew is formed on the surface of the tire. Since the bent spew has a length of 10 mm or more, and in some cases, 20 mm or more, it has been a problem in appearance quality. Therefore, after the vulcanization molding, the bent spew was cut to solve this problem. The manufacturing process increased and the cost was increased. In particular, when the diameter of the bent spew is 0.4 mm or less, it is difficult to automate trimming, and it is necessary to perform trimming manually, resulting in further cost increase.

コスト増の問題を解決すべく、特許文献１に開示された金型では、ベントホールに多孔質樹脂フィルターを設けて、ベントスピューを形成させることなく、金型内の空気の排出を行ない、ライトの発生を防止している。
特開平１０−４４１５４号公報（図１、請求項１〜３） In order to solve the problem of cost increase, in the mold disclosed in Patent Document 1, a porous resin filter is provided in the vent hole to discharge the air in the mold without forming a vent spew. Is prevented.
Japanese Patent Laid-Open No. 10-44154 (FIG. 1, claims 1 to 3)

しかしながら、特許文献１に記載の金型では、多孔質樹脂フィルターが使用されているので耐熱性の点で問題があった。加硫成型時に、当該フィルターが生タイヤに直接接触するので、ゴムや添加物による目詰まりが起こることがあった。また、ブラスト粉（粒径が約0.2〜2.0ｍｍ）を吹き付けて金型を洗浄する場合、ブラスト粉が直接フィルターに当たるので、フィルターの損傷や目詰まりを起こすこともあった。   However, the mold described in Patent Document 1 has a problem in terms of heat resistance because a porous resin filter is used. At the time of vulcanization molding, since the filter is in direct contact with the raw tire, clogging with rubber and additives may occur. In addition, when the blast powder (particle size is about 0.2 to 2.0 mm) is sprayed to clean the mold, the blast powder directly hits the filter, which may cause damage to the filter or clogging.

その結果、金型のメインテナンス性が低下し、却ってコスト増を招くことさえあった。したがって、本発明の目的は、金型のメインテナンス性が低下させることなく、トリミング作業を省略可能としたベントピースを提供することにある。   As a result, the maintainability of the mold is lowered, and the cost is even increased. Therefore, an object of the present invention is to provide a vent piece that can omit the trimming operation without deteriorating the maintainability of the mold.

本願発明は、タイヤ成型用金型に取り付けられるベントピースであって、
ベントピース本体の一端から通気孔が設けられ、他端から前記通気孔に連通する凹部が設けられ、前記凹部に多孔質体が挿入されていることを特徴とする。 The present invention is a vent piece attached to a tire molding die,
A vent hole is provided from one end of the vent piece main body, a concave portion communicating from the other end to the vent hole is provided, and a porous body is inserted into the concave portion.

本願発明のベントピースによれば、従前どおり通気孔により金型内に溜まった空気を排出することができる。多孔質体は、空気を透過させゴムを透過させない性質を有しているので、空気の排出の妨げとならず、ベントスピューが一定以上の長さにならず、完成したタイヤの外観品質を低下させない。また、多孔質体は金型の成型面より内側に位置するので、ブラスト粉による洗浄を行なっても、損傷や目詰まりを起こすことがない。   According to the vent piece of the present invention, the air accumulated in the mold can be discharged by the vent hole as before. The porous body has the property of allowing air to pass but not rubber, so it will not interfere with air discharge, the vent spew will not be longer than a certain length, and the appearance quality of the finished tire will deteriorate. I won't let you. In addition, since the porous body is located on the inner side of the molding surface of the mold, damage and clogging will not occur even if cleaning with blast powder is performed.

本願発明は、前記多孔質体は多孔質金属焼結体であって、ベントピース長さ方向に延びる無数の縦孔を備えたことを特徴とする。   The present invention is characterized in that the porous body is a porous metal sintered body and has innumerable vertical holes extending in the length direction of the vent piece.

ベントピース長さ方向に延びる無数の縦孔を備えたことにより、排出される空気の透過抵抗をより低くできる。   By providing innumerable vertical holes extending in the vent piece length direction, the permeation resistance of the discharged air can be further reduced.

本願発明は、前記多孔質体の孔径あるいは前記縦孔の直径は５〜１００μｍであることを特徴とする。   The present invention is characterized in that the pore diameter of the porous body or the diameter of the longitudinal hole is 5 to 100 μm.

多孔質の孔径や縦孔の直径は１００μｍを超えると、ゴムや添加剤などにより目詰まりを起こすおそれがあり、５μｍ未満であると排出される空気の透過抵抗が高くなることがある。   If the diameter of the porous hole or the diameter of the vertical hole exceeds 100 μm, clogging may occur due to rubber or additives, and if it is less than 5 μm, the permeation resistance of the discharged air may increase.

本願発明は、前記多孔質体の形状は円柱状又は角柱状であることを特徴とする。   The present invention is characterized in that the porous body has a columnar shape or a prismatic shape.

多孔質体の形状を円柱状又は角柱状とすることにより、ベントピースの凹部の加工が容易になり、しかも打ち込みなどで多孔質体を容易にベントピースに取り付けることができる。   By making the shape of the porous body cylindrical or prismatic, the recess of the vent piece can be easily processed, and the porous body can be easily attached to the vent piece by driving or the like.

本願発明は、前記通気孔の長さは５ｍｍ以下であることを特徴とする。   The present invention is characterized in that the vent hole has a length of 5 mm or less.

通気孔の長さは５ｍｍ以下とすれば、形成されるベントスピューの長さも５ｍｍ以下となり、外観品質上問題とならず、タイヤ完成後のトリミング作業を省略でき、製造コストを削減することができる。   If the length of the vent hole is 5 mm or less, the length of the vent spew formed is also 5 mm or less, which does not cause a problem in appearance quality, trimming work after completion of the tire can be omitted, and manufacturing cost can be reduced. .

以下、図面を用いて、本発明に係るベントピースの実施の形態を説明する。図１（ａ）は、本発明に係るベントピースの断面図である。図において、ベントピース１はＳＵＳなどの金属製であり、一端に長さ方向の延びる通気孔２が設けられ、他端から凹部３が設けられている。そして、通気孔２と凹部３は連通している。更に、凹部３には、多孔質体４が挿入されている。多孔質体４は、空気を透過させる多孔質性を有しているが、ゴムを透過させない性質を有している。なお、通気孔２の長さをＬ１、多孔質体４の長さはＬ２である。   Hereinafter, an embodiment of a vent piece according to the present invention will be described with reference to the drawings. Fig.1 (a) is sectional drawing of the vent piece which concerns on this invention. In the figure, the vent piece 1 is made of metal such as SUS, and is provided with a vent hole 2 extending in the length direction at one end and a recess 3 from the other end. The vent hole 2 and the recess 3 communicate with each other. Further, a porous body 4 is inserted into the recess 3. The porous body 4 has a porous property that allows air to permeate, but has a property that does not allow rubber to permeate. The length of the vent hole 2 is L1, and the length of the porous body 4 is L2.

図１（ｂ）に示すように、ベントピース１は、通気孔２側を成型面側になるように金型Ｍに取り付けられている。取り付け方法は、打ち込みなど公知の方法で構わない。そして、金型Ｍの排出孔１１と凹部３とが連通するように取り付けられている。なお、金型Ｍは、タイヤを加硫成型する金型であればよく、種類を問わない。   As shown in FIG. 1B, the vent piece 1 is attached to the mold M so that the vent hole 2 side is on the molding surface side. The attachment method may be a known method such as driving. And the discharge hole 11 of the metal mold | die M and the recessed part 3 are attached so that it may connect. The mold M is not particularly limited as long as it is a mold for vulcanizing and molding a tire.

金型Ｍが閉じた後、金型Ｍ内に溜まった空気は、通気孔２及び多孔質体４を通過し、排出孔１１を通じて排出される。ゴムの一部も通気孔２に進入するが、多孔質体４により進入が阻止される。その結果、形成されるベントスピューは、通気孔２の長さＬ１以下となる。したがって、Ｌ１を外観品質上問題とならない長さ、例えば５ｍｍ以下、より好ましくは４ｍｍ以下とすることで、トリミング作業を省略することができ、製造コストの削減することができる。   After the mold M is closed, the air accumulated in the mold M passes through the vent hole 2 and the porous body 4 and is discharged through the discharge hole 11. Part of the rubber also enters the vent hole 2 but is prevented from entering by the porous body 4. As a result, the bent spew formed is not longer than the length L1 of the vent hole 2. Therefore, by setting L1 to a length that does not cause a problem in appearance quality, for example, 5 mm or less, more preferably 4 mm or less, the trimming operation can be omitted, and the manufacturing cost can be reduced.

また、金型Ｍに取り付けられた状態で、多孔質体４は成型面に露出していない。ブラスト粉を吹き付けて金型Ｍを洗浄しても、ブラスト粉が多孔質体４に当たることがないので、多孔質体４の損傷や目詰まりを防止することができる。かかる観点から、Ｌ１は２ｍｍ以上であることが好ましい。   In addition, the porous body 4 is not exposed on the molding surface while being attached to the mold M. Even when the blast powder is sprayed and the mold M is washed, the blast powder does not hit the porous body 4, so that the porous body 4 can be prevented from being damaged or clogged. From this viewpoint, L1 is preferably 2 mm or more.

多孔質体４の長さＬ２は、２〜１５ｍｍが好ましい。２ｍｍ未満では、強度不足で多孔質体破損の恐れがあることに加え、空気排出効果喪失するからである。一方、１５ｍｍを越えてしまうと材料費の無駄になるだけである。   The length L2 of the porous body 4 is preferably 2 to 15 mm. If it is less than 2 mm, the porous body may be damaged due to insufficient strength, and the air discharge effect is lost. On the other hand, if it exceeds 15 mm, only material costs are wasted.

多孔質体４は、空気を透過させ、ゴムを透過させない性質を有している限り特に限定されることがないが、耐熱性を有していることがより好ましい。例えば、多孔質金属、多孔質金属酸化物、多孔質セラミックス、多孔質金属焼結体などが挙げられる。多孔質金属としてポーラス状アルミニウム（萱野工業株式会社製、商品名「ＭＥＴＡＰＯＲ」）、多孔質金属酸化物としてポーラス状アルミナ（萱野工業株式会社製、商品名「ＭＥＴＡＰＯＲ」）を使用できる。多孔質セラミックスとして、アイ・イー・サービス株式会社製の多孔質セラミックスを使用することができる。   The porous body 4 is not particularly limited as long as it has a property of permeating air and not permeating rubber, but it is more preferable that the porous body 4 has heat resistance. For example, a porous metal, a porous metal oxide, a porous ceramic, a porous metal sintered body, and the like can be given. Porous aluminum (trade name “METAPOR” manufactured by Sugano Industry Co., Ltd.) can be used as the porous metal, and porous alumina (trade name “METAPOR” manufactured by Sugano Industry Co., Ltd.) can be used as the porous metal oxide. As the porous ceramics, porous ceramics manufactured by I Service Co., Ltd. can be used.

多孔質金属焼結体として、株式会社ファインシンター製の多孔質金属焼結体（商品名「Ｐ型焼結ベント（登録商標）」）を使用できる。該多孔質金属焼結体は、図１（ｃ）に示すように、長さ方向に延びる無数の縦孔５を備えているので、空気の透過抵抗が少なくなる点で好ましい。   As the porous metal sintered body, a porous metal sintered body (trade name “P-type sintered vent (registered trademark)”) manufactured by Fine Sinter Co., Ltd. can be used. As shown in FIG. 1 (c), the porous metal sintered body includes innumerable vertical holes 5 extending in the length direction, which is preferable in that air permeation resistance is reduced.

なお、多孔質の孔径や縦孔の直径は、５〜１００μｍが好ましく、５〜１００μｍがより好ましい。１００μｍを超えると、ゴムや添加剤などにより目詰まりを起こすおそれがあるからである。   In addition, 5-100 micrometers is preferable and the diameter of a porous hole diameter or a vertical hole has more preferable 5-100 micrometers. This is because if it exceeds 100 μm, clogging may occur due to rubber or additives.

多孔質体４の形状は、円柱状であっても角柱状であってもよい。また、多孔質体４の直径や幅を凹部３の直径や幅より１０〜５０μｍだけ大きくしておくと、容易にベントピースの凹部３に打ち込むことができ、しかも凹部３により加締められるので確実に取り付けることができる。   The shape of the porous body 4 may be cylindrical or prismatic. In addition, if the diameter and width of the porous body 4 are made larger by 10 to 50 μm than the diameter and width of the recess 3, it can be easily driven into the recess 3 of the vent piece and can be securely crimped by the recess 3. Can be attached to.

（ａ）は本発明に係るベントピースを示す断面図、（ｂ）は本発明に係るベントピースが取り付けられた金型の断面図、（ｃ）は多孔質体の断面をそれぞれ示す。(A) is sectional drawing which shows the vent piece which concerns on this invention, (b) is sectional drawing of the metal mold | die with which the vent piece which concerns on this invention was attached, (c) shows the cross section of a porous body, respectively.

符号の説明Explanation of symbols

１ ベントピース
２ 通気孔
３ 凹部
４ 多孔質体
１１ 排出孔
Ｍ 金型
DESCRIPTION OF SYMBOLS 1 Vent piece 2 Ventilation hole 3 Recessed part 4 Porous body 11 Discharge hole M Mold

Claims (7)

タイヤ成型用金型に取り付けられるベントピースであって、
ベントピース本体の一端から通気孔が設けられ、他端から前記通気孔に連通する凹部が設けられ、前記凹部に多孔質体が挿入されていることを特徴とするベントピース。 A vent piece attached to a tire mold,
A vent piece characterized in that a vent hole is provided from one end of the vent piece main body, a concave portion communicating with the vent hole is provided from the other end, and a porous body is inserted into the concave portion. 前記多孔質体の孔径は５〜１００μｍであることを特徴とする請求項１に記載のベントピース。   The vent piece according to claim 1, wherein the porous body has a pore diameter of 5 to 100 μm. 前記多孔質体は多孔質金属焼結体であって、ベントピース長さ方向に延びる無数の縦孔を備えたことを特徴とする請求項１に記載のベントピース。   2. The vent piece according to claim 1, wherein the porous body is a porous metal sintered body and includes innumerable vertical holes extending in a length direction of the vent piece. 前記縦孔の直径は５〜１００μｍであることを特徴とする請求項３に記載のベントピース。   The vent piece according to claim 3, wherein the vertical hole has a diameter of 5 to 100 μm. 前記多孔質体の形状は円柱状又は角柱状であることを特徴とする請求項１乃至４のいずれかに記載のベントピース。   The vent piece according to any one of claims 1 to 4, wherein the porous body has a columnar shape or a prismatic shape. 前記通気孔の長さは５ｍｍ以下であることを特徴とする請求項１乃至５のいずれかに記載のベントピース。   The vent piece according to any one of claims 1 to 5, wherein the vent hole has a length of 5 mm or less. 請求項１乃至６のいずれかに記載のベントピースが取り付けられたタイヤ成型用金型。   A mold for molding a tire to which the vent piece according to any one of claims 1 to 6 is attached.
JP2005252963A 2005-09-01 2005-09-01 Pneumatic tire Pending JP2007062235A (en)

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KR101327224B1 (en) 2010-12-07 2013-11-11 한국타이어 주식회사 Bladder of the vulcanizing mold
US9522509B2 (en) 2014-01-09 2016-12-20 Bridgestone Americas Tire Operations, Llc Tire mold vent
JP2016221840A (en) * 2015-05-29 2016-12-28 住友ゴム工業株式会社 Vulcanization mold and vent piece used therein
KR102291653B1 (en) * 2020-05-15 2021-08-20 넥센타이어 주식회사 Vacuum container for curing tire and tire manufacturing apparatus comprising the same

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JPH09314567A (en) * 1996-05-24 1997-12-09 Hashiba Tekko Kk Vent piece of mold for vulcanizing tire
JP2002264145A (en) * 2001-03-08 2002-09-18 Yokohama Rubber Co Ltd:The Pneumatic tire and mold for vulcanizing and molding the same

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JPH09314567A (en) * 1996-05-24 1997-12-09 Hashiba Tekko Kk Vent piece of mold for vulcanizing tire
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Cited By (4)

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KR101327224B1 (en) 2010-12-07 2013-11-11 한국타이어 주식회사 Bladder of the vulcanizing mold
US9522509B2 (en) 2014-01-09 2016-12-20 Bridgestone Americas Tire Operations, Llc Tire mold vent
JP2016221840A (en) * 2015-05-29 2016-12-28 住友ゴム工業株式会社 Vulcanization mold and vent piece used therein
KR102291653B1 (en) * 2020-05-15 2021-08-20 넥센타이어 주식회사 Vacuum container for curing tire and tire manufacturing apparatus comprising the same

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