JPH05116151A - Vulcanizing method of pneumatic tire - Google Patents
Vulcanizing method of pneumatic tireInfo
- Publication number
- JPH05116151A JPH05116151A JP10131191A JP10131191A JPH05116151A JP H05116151 A JPH05116151 A JP H05116151A JP 10131191 A JP10131191 A JP 10131191A JP 10131191 A JP10131191 A JP 10131191A JP H05116151 A JPH05116151 A JP H05116151A
- Authority
- JP
- Japan
- Prior art keywords
- green tire
- bladder
- mold
- tire
- vulcanization
- 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.)
- Pending
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は空気入りタイヤの加硫方
法に関する。FIELD OF THE INVENTION The present invention relates to a method for vulcanizing a pneumatic tire.
【０００２】[0002]
【従来の技術】一般に、空気入りタイヤの加硫方法は、
グリーンタイヤを金型にセットし、このグリーンタイヤ
の内側に挿入したブラダーに加熱媒体を供給してグリー
ンタイヤを金型の内面に押し付けた状態にして加硫を行
うようにしている。このような加硫方法において、グリ
ーンタイヤとブラダーとの接着を防止し、加硫終了後の
離型性をよくするため、ブラダーの表面にシリコーン等
の離型剤を塗布すると共にグリーンタイヤの内面にグリ
ーン・インサイド・ペイントと称する、比較的粒子径の
大きいマイカ粉末やタルク等の粉末離型剤を塗布するよ
うにしている。しかし、この粉末離型剤は加硫終了後も
タイヤの内側に粒子状のまま付着するため、内面外観を
悪化するという問題があった。しかも、ブラダーでグリ
ーンタイヤを押圧するとき、粉末離型剤がインナーライ
ナー層のスプライス部に巻き込まれて、所謂インサイド
・スプライス・クラックと称するクラックが発生し易く
なり、タイヤの耐久性が低下するという問題があった。2. Description of the Related Art Generally, a method for vulcanizing a pneumatic tire is
A green tire is set in a mold, a heating medium is supplied to a bladder inserted inside the green tire, and the green tire is pressed against the inner surface of the mold for vulcanization. In such a vulcanization method, in order to prevent the adhesion between the green tire and the bladder and improve the mold release property after the vulcanization, a mold release agent such as silicone is applied to the surface of the bladder and the inner surface of the green tire is also applied. In addition, a powder release agent such as mica powder or talc having a relatively large particle diameter, which is called "Green Inside Paint", is applied. However, since this powder release agent adheres to the inside of the tire in a particulate form even after the completion of vulcanization, there is a problem that the inner surface appearance is deteriorated. Moreover, when the green tire is pressed with the bladder, the powder release agent is caught in the splice portion of the inner liner layer, and cracks called so-called inside splice cracks are likely to occur, which deteriorates the durability of the tire. There was a problem.
【０００３】このようなタイヤ内面の外観悪化やインナ
ーライナー層スプライス部でのクラックの発生を解消す
るため、上記粉末離型剤を使用しないでブラダー表面に
シリコーン等を塗布しただけで行う加硫方法がある。し
かし、この粉末離型剤を使用しない加硫方法は、ブラダ
ーでグリーンタイヤが押圧されるとき、インナーライナ
ー層のスプライス部の段付き部分にエヤー溜りを生じ、
ライト故障と称する小さな凹みを形成し易くなり、これ
が欠陥になって耐久性を悪化させるという欠点があっ
た。[0003] In order to eliminate the deterioration of the appearance of the inner surface of the tire and the generation of cracks in the spliced portion of the inner liner layer, a vulcanization method is carried out by simply coating the surface of the bladder with silicone or the like without using the above powder release agent. There is. However, the vulcanization method that does not use this powder release agent, when the green tire is pressed by the bladder, causes an air pool in the stepped portion of the splice portion of the inner liner layer,
There is a drawback in that a small recess called a write failure is easily formed, which becomes a defect and deteriorates durability.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、粉末
離型剤を使用しないで加硫を行ってもライト故障を発生
しないようにした空気入りタイヤの加硫方法を提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for vulcanizing a pneumatic tire in which a light failure does not occur even if vulcanization is performed without using a powder release agent. ..
【０００５】[0005]
【課題を解決するための手段】このような目的を達成す
る本発明は、グリーンタイヤを金型にセットし、該グリ
ーンタイヤの内側に挿入したブラダーに加熱媒体を供給
することによって前記グリーンタイヤを金型内面に押し
付けた後加硫を行う方法において、前記ブラダーを膨張
させて前記グリーンタイヤを金型内面に最初に型付けす
る際に、前記ブラダーとグリーンタイヤとの間を負圧源
により吸引し、該ブラダーを前記グリーンタイヤの内面
に密着させるようにすることを特徴とする。SUMMARY OF THE INVENTION The present invention to achieve such an object is to set the green tire in a mold, and to supply the heating medium to a bladder inserted inside the green tire to provide the green tire. In the method of performing vulcanization after pressing against the inner surface of the mold, when the green tire is first molded on the inner surface of the mold by inflating the bladder, a negative pressure source sucks between the bladder and the green tire. The bladder is closely attached to the inner surface of the green tire.
【０００６】このように加硫操作初期においてブラダー
を膨張させるとき、グリーンタイヤとブラダーとの間を
負圧にして相互を密着させるため、ブラダーの圧着力に
よりインナーライナー層のスプライス部の段付き部分を
平坦化させ、エヤー溜りの発生を防止することができ
る。また、粉末離型剤を使用しなくて済むためタイヤ内
面の外観を向上し、かつクラックの発生も防止すること
ができる。Thus, when the bladder is inflated in the initial stage of the vulcanization operation, a negative pressure is applied between the green tire and the bladder to bring them into close contact with each other. Can be flattened and the occurrence of air accumulation can be prevented. Further, since it is not necessary to use the powder release agent, the appearance of the inner surface of the tire can be improved and the generation of cracks can be prevented.
【０００７】[0007]
【実施例】以下、本発明の加硫方法の実施例を図面を参
照しながら説明する。図１において、Ｍは金型、Ｔはグ
リーンタイヤである。金型Ｍは上型１ｕと下型１ｄとか
らなり それぞれビードリング３ｕ，３ｄを備えてい
る。このビードリング３ｕ，３ｄの内側端には、クラン
プリング４に挟持されたブラダー５が設けられ金型Ｍの
内側に延長している。また、ビードリング３ｕ，３ｄに
は、それぞれ外側から内側へ貫通するように吸引孔６，
６’が設けられ、図示しない負圧源に接続されている。
また、ビードリング３ｕには、エアーシールのためＯリ
ング７が設けられている。Embodiments of the vulcanization method of the present invention will be described below with reference to the drawings. In FIG. 1, M is a mold and T is a green tire. The mold M is composed of an upper mold 1u and a lower mold 1d, and bead rings 3u and 3d, respectively. A bladder 5 held by a clamp ring 4 is provided at the inner ends of the bead rings 3u and 3d and extends inside the mold M. The bead rings 3u and 3d are provided with suction holes 6 so as to penetrate from the outside to the inside.
6'is provided and connected to a negative pressure source (not shown).
Further, the bead ring 3u is provided with an O-ring 7 for air sealing.
【０００８】本発明において、グリーンタイヤの加硫方
法は上述した金型Ｍを使用して次のようにして実施され
る。まず、図１に示すように、グリーンタイヤＴを上型
１ｕと下型１ｄとからなる金型Ｍにセットする。次い
で、矢印で示すように、ブラダー５に加熱媒体Ｇ（不活
性ガス、窒素ガス、飽和水蒸気等）を供給することによ
りブラダー５を膨張させて、グリーンタイヤＴを金型Ｍ
内面に押圧し、最初の型付けを行う。このようにグリー
ンタイヤＴを最初に金型Ｍ内面に型付け操作するとき、
ビードリング３ｕ，３ｄに設けた吸引孔６，６’をバル
ブ操作等により負圧源に連通させ、グリーンタイヤＴと
ブラダー５との間を吸引し、ブラダー５をグリーンタイ
ヤＴの内壁面に密着させ、同時にブラダー５の膨張によ
りグリーンタイヤＴを金型Ｍ内面に密着させて、この状
態を数十秒ないし数分間保持するようにする。この操作
により、グリーンタイヤＴは型付けされ、以後の加硫工
程が開始する。In the present invention, the method for vulcanizing a green tire is carried out as follows using the mold M described above. First, as shown in FIG. 1, the green tire T is set in a mold M including an upper mold 1u and a lower mold 1d. Next, as shown by the arrow, the bladder 5 is expanded by supplying the heating medium G (inert gas, nitrogen gas, saturated steam, etc.) to the bladder 5, and the green tire T is transferred to the mold M.
Press on the inner surface and perform the first imprinting. In this way, when the green tire T is first molded on the inner surface of the mold M,
The suction holes 6, 6'provided in the bead rings 3u, 3d are made to communicate with a negative pressure source by a valve operation or the like to suck between the green tire T and the bladder 5, and the bladder 5 is brought into close contact with the inner wall surface of the green tire T. At the same time, the green tire T is brought into close contact with the inner surface of the mold M by the expansion of the bladder 5, and this state is maintained for several tens of seconds to several minutes. By this operation, the green tire T is modeled and the subsequent vulcanization step is started.
【０００９】本発明において、上記吸引操作は、加硫開
始までのグリーンタイヤＴの型付け操作時に行う必要が
ある。望ましくはビードリング３ｕ，３ｄがそれぞれ上
型１ｕと下型１ｄとに密着し、ブラダー５を数回繰り返
して膨張収縮させる、所謂バンピングを行いながら又は
行った後に行うのがよい。このように上記吸引操作を加
硫開始までのグリーンタイヤＴの型付け時に行うことに
よりグリーンタイヤＴとブラダー５との間の密着性が高
められ、インナーライナー層のスプライス部の段付き部
分が平坦化されるため、エヤー溜りの発生を防止するこ
とができる。In the present invention, the above-mentioned suction operation needs to be carried out during the molding operation of the green tire T before the start of vulcanization. Desirably, the bead rings 3u and 3d are brought into close contact with the upper die 1u and the lower die 1d, respectively, and the bladder 5 is repeatedly inflated and shrunk several times. By performing the above suction operation at the time of molding the green tire T before the start of vulcanization, the adhesion between the green tire T and the bladder 5 is enhanced, and the stepped portion of the splice portion of the inner liner layer is flattened. Therefore, it is possible to prevent the occurrence of air accumulation.
【００１０】また、上記吸引操作の効果を向上するに
は、ビードリング３ｕ，３ｄに設けた吸引孔６，６’の
数をできるだけ多く、かつ均等なピッチで設けることが
望ましい。また、この吸引孔６，６’の数を少なくする
ときは、できるだけインナーライナー層のスプライス部
に近い位置に設けるようにするのがよい。本発明におい
て、ブラダーに供給する加熱流体としては、特に限定さ
れないが、例えば１４〜２１ｋｇ／ｃｍ2 （１９８〜２
１７℃）の飽和水蒸気を挙げることができる。また、グ
リーンタイヤの内面には粉末離型剤は塗布しないが、ブ
ラダー表面にはシリコーン等の離型剤を塗布して加硫完
了後の離型性をよくするようにする。In order to improve the effect of the suction operation, it is desirable that the number of suction holes 6 and 6'provided in the bead rings 3u and 3d be as large as possible and that they be provided at a uniform pitch. When the number of the suction holes 6 and 6'is reduced, it is preferable that the suction holes 6 and 6'be provided as close to the splice portion of the inner liner layer as possible. In the present invention, the heating fluid supplied to the bladder is not particularly limited, but is, for example, 14 to 21 kg / cm 2 (198 to 2 ).
17 ° C.) saturated steam can be mentioned. Although the powder mold release agent is not applied to the inner surface of the green tire, a mold release agent such as silicone is applied to the surface of the bladder to improve the mold release property after completion of vulcanization.
【００１１】[0011]
【発明の効果】本発明によれば、グリーンタイヤをブラ
ダーの膨張により金型に最初に型付けするとき、グリー
ンタイヤとブラダーとの間を負圧にし、ブラダーとグリ
ーンタイヤとを密着させるので、インナーライナー層の
スプライス部の段付き部分が平坦化され、エヤー溜りの
発生を防止することができる。このため、ライト故障に
起因する欠陥の発生を防止することができる。また、粉
末離型剤を使用しないで済むため、タイヤ内面の外観悪
化をなくし、かつインナーライナー層のスプライス部で
クラックを生ずることがなくタイヤの耐久性を向上する
ことができる。According to the present invention, when the green tire is first molded into the mold by the expansion of the bladder, a negative pressure is applied between the green tire and the bladder to bring the bladder and the green tire into close contact with each other. The stepped portion of the splice portion of the liner layer is flattened to prevent air accumulation. Therefore, it is possible to prevent the occurrence of defects due to the write failure. Further, since it is not necessary to use the powder release agent, deterioration of the appearance of the inner surface of the tire can be prevented, and the durability of the tire can be improved without causing cracks at the splice portion of the inner liner layer.
【図１】本発明の加硫方法の１例を示す説明図である。FIG. 1 is an explanatory diagram showing an example of a vulcanizing method of the present invention.
１ｕ 上型 １ｄ 下型 ３ｕ，３ｄ ビードリング ５ ブラダー ６，６’ 吸引孔 Ｍ 金型 Ｔ グリーンタイヤ Ｇ 加熱媒体 1u Upper mold 1d Lower mold 3u, 3d Bead ring 5 Bladder 6,6 'Suction hole M Mold T Green tire G Heating medium
Claims (1)
リーンタイヤの内側に挿入したブラダーに加熱媒体を供
給することによって前記グリーンタイヤを金型内面に押
し付けた後加硫を行う方法において、前記ブラダーを膨
張させて前記グリーンタイヤを金型内面に最初に型付け
する際に、前記ブラダーとグリーンタイヤとの間を負圧
源により吸引し、該ブラダーを前記グリーンタイヤの内
面に密着させるようにする空気入りタイヤの加硫方法。1. A method in which a green tire is set in a mold, and a heating medium is supplied to a bladder inserted inside the green tire to press the green tire against the inner surface of the mold to perform vulcanization. When the bladder is expanded to initially mold the green tire on the inner surface of the mold, a negative pressure source is sucked between the bladder and the green tire so that the bladder is brought into close contact with the inner surface of the green tire. Vulcanizing method for pneumatic tires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10131191A JPH05116151A (en) | 1991-05-07 | 1991-05-07 | Vulcanizing method of pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10131191A JPH05116151A (en) | 1991-05-07 | 1991-05-07 | Vulcanizing method of pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05116151A true JPH05116151A (en) | 1993-05-14 |
Family
ID=14297271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10131191A Pending JPH05116151A (en) | 1991-05-07 | 1991-05-07 | Vulcanizing method of pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05116151A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007037506A1 (en) | 2005-09-28 | 2007-04-05 | Ichimaru Giken Co., Ltd. | Tire vulcanization method and tire vulcanization apparatus |
-
1991
- 1991-05-07 JP JP10131191A patent/JPH05116151A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007037506A1 (en) | 2005-09-28 | 2007-04-05 | Ichimaru Giken Co., Ltd. | Tire vulcanization method and tire vulcanization apparatus |
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