JPS6320700B2 - - Google Patents
Info
- Publication number
- JPS6320700B2 JPS6320700B2 JP57212978A JP21297882A JPS6320700B2 JP S6320700 B2 JPS6320700 B2 JP S6320700B2 JP 57212978 A JP57212978 A JP 57212978A JP 21297882 A JP21297882 A JP 21297882A JP S6320700 B2 JPS6320700 B2 JP S6320700B2
- Authority
- JP
- Japan
- Prior art keywords
- tire
- mooney viscosity
- mold
- scorch time
- 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.)
- Expired
Links
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 2
- 238000004073 vulcanization Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 239000004636 vulcanized rubber Substances 0.000 description 3
- 238000007730 finishing process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
-
- 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
- B29D30/02—Solid tyres ; Moulds therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Tyre Moulding (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は空気入りタイヤに類似した断面形状の
ニユーマチツク型ソリツドタイヤの製造方法に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a pneumatic type solid tire having a cross-sectional shape similar to a pneumatic tire.
一般にニユーマチツク型ソリツドタイヤは、加
硫の際に金型と末加硫ゴムの界面に生ずるエアー
溜りによるベア、あるいはタイヤ内部での気泡残
りを防止するため、ベントホールを設けた金型に
より成形されている。この金型は、例えば第１図
に示す如く、クリツプリングｂに金型セグメント
ｃを嵌合することにより生じるその内部空隙ｄ、
にタイヤ生カバーを入れてプレス加硫することに
より内部空隙ｄの形状のタイヤを製造するもので
あるが、前記金型セグメントｃには、金型ａ内部
のエアーを外部に放出しタイヤ生カバーを完全に
充填するため、外部に連通する直径1.5〜1.8mmの
ベントホールｅを多数穿設している。しかしこの
ような金型ａを用いるものでは、加硫ゴムの表面
に前記ベントホールｅに流れこみ硬化した所謂ス
ピユーが残るため、これをナイフ等で削除する必
要がある一方、金型セグメントｃのベントホール
ｅにスピユーがつまり、これを取り除かなければ
ならず、成形作業の能率を著しく低下させる原因
となつている。例えば加硫タイヤ表面のスピユー
は仕上げ工程で取り除かれるが、この仕上げ工程
に要する時間の約60％はスピユーの取り除き作業
に消費される。 In general, pneumatic solid tires are molded using a mold with vent holes to prevent air pockets from forming at the interface between the mold and the vulcanized rubber during vulcanization, or to prevent air bubbles from remaining inside the tire. There is. For example, as shown in FIG.
A tire having a shape of an internal gap d is manufactured by inserting a green tire cover into the mold and press-curing the tire. In order to completely fill the tank, a large number of vent holes e with a diameter of 1.5 to 1.8 mm are made to communicate with the outside. However, in those using such mold a, so-called spills that flow into the vent holes e and harden remain on the surface of the vulcanized rubber, which must be removed with a knife or the like. The vent hole e is clogged with spills, which must be removed, causing a significant drop in the efficiency of the molding operation. For example, spills on the surface of a vulcanized tire are removed during the finishing process, and approximately 60% of the time required for this finishing process is spent removing the spills.
そこで発明者は金型セグメントにベントホール
を設けないで、加硫する条件について種々検討を
重ねた結果、加硫タイヤ表面におけるベア、ある
いはエアー溜りは、未加硫ゴムのムーニー粘度
と、スコーチタイムとに密接に関係して発生し、
これらの特性を特定範囲に限定した未加硫ゴムを
使用することにより、ベアあるいはエアー溜りが
効果的に防止しうることを発見し、本発明を完成
したものであつて、本発明のソリツドタイヤの製
造方法は、成形生カバーを予め80℃以下の温度で
予熱し、しかる後プレス中で加硫硬化するニユー
マチツク型ソリツドタイヤを製造方法において、
前記生カバーはムーニー粘度（ML1+4、130℃）
が48以下、かつスコーチタイムt10（min）が25以
下に調整されたことを特徴としている。 Therefore, the inventor conducted various studies on the conditions for vulcanization without providing vent holes in the mold segments, and found that bare air or air pockets on the surface of the vulcanized tire are determined by the Mooney viscosity of the unvulcanized rubber and the scorch time. occurs in close connection with
The present invention has been completed by the discovery that bare rubber or air pockets can be effectively prevented by using unvulcanized rubber that has these characteristics limited to specific ranges, and the present invention has been completed. The manufacturing method is to preheat a molded raw cover at a temperature of 80°C or less, and then vulcanize and harden it in a press.
The raw cover has Mooney viscosity (ML 1+4 , 130℃)
is 48 or less, and the scorch time t10 (min) is adjusted to 25 or less.
まず生カバーのムーニー粘度（ML1+4、130℃）
を種々変更し、ベントホールのない金型を用い
て、その加硫後のソリツドタイヤの外観不良発生
率を測定したところ、ムーニー粘度が48以上で急
激に不良が発生することが判明した。その状態を
第２図に示す。ここで外観不良発生率とは、7.00
―12ソリツドタイヤを100本加硫し、外観不良、
例えばベア等を観察し、その不良本数の割合を％
で評価したものである。また予熱条件は80℃で
360分であり、加硫条件は155℃で180分である。 First, Mooney viscosity of raw cover (ML 1+4 , 130℃)
When we measured the incidence of appearance defects in solid tires after vulcanization using various changes in molds without vent holes, we found that defects rapidly occurred when the Mooney viscosity was 48 or higher. The state is shown in FIG. Here, the appearance defect incidence rate is 7.00
- 100 12 solid tires were cured and the appearance was poor.
For example, observe bare items, etc., and calculate the percentage of defective items.
It was evaluated by Also, the preheating condition is 80℃.
360 minutes, and the vulcanization conditions are 155°C and 180 minutes.
次にムーニー粘度が47以下の生カバーを使用し
て、そのスコーチタイムと外観不良発生率との関
係を検討したところ、第３図に示すように、スコ
ーチタイムが25分以上で外観不良が急激に発生す
ることが判つた。これは未加硫の生カバーのムー
ニー粘度を比較的低い値に設定することにより、
生カバーが金型内表面を充分に流動し、付着する
ことによつて、前述のエアー溜りによるベアーの
発生を防止し又気泡を内部にとりこむことを防ぎ
うるとともに、ベントホールがない為、スピユー
の発生もなく、又生カバーのスコーチタイムを短
く調整することは、金型内表面に接する部分即ち
タイヤ表面での硬化速度が内部の硬化に比較して
大となり、内部からタイヤ表面への未加硫ゴムの
流出による弊害、例えば金型上下の合わせ面での
トリム割れを解消できるとともに、仕上がりタイ
ヤの外観を一層向上している。かかる実験、テス
トの結果に基づき、本発明の製造方法では、生カ
バーのムーニー粘度、スコーチタイムを前記のご
とく設定したものであつて、本発明によるタイヤ
ではスピユーがないため、この除去作業が省略で
き、仕上げ作業の時間を大巾に約60％程度、短縮
しうる。 Next, we investigated the relationship between the scorch time and appearance defect occurrence rate using a raw cover with a Mooney viscosity of 47 or less.As shown in Figure 3, we found that when the scorch time was 25 minutes or more, the appearance defects suddenly increased. It was found that this occurs. This is achieved by setting the Mooney viscosity of the unvulcanized raw cover to a relatively low value.
By sufficiently flowing and adhering the raw cover to the inner surface of the mold, it is possible to prevent the formation of air due to the aforementioned air pockets and to prevent air bubbles from being trapped inside. In addition, by adjusting the scorch time of the green cover to be short, the curing speed at the part in contact with the inner surface of the mold, that is, the tire surface, is faster than the internal curing, and there is no leakage from the inside to the tire surface. This eliminates the problems caused by vulcanized rubber leakage, such as trim cracks at the upper and lower mating surfaces of the mold, and further improves the appearance of the finished tire. Based on the results of such experiments and tests, in the manufacturing method of the present invention, the Mooney viscosity and scorch time of the raw cover are set as described above, and since there is no spill in the tire according to the present invention, this removal work is omitted. This can significantly reduce finishing work time by approximately 60%.
なお本発明の製造方法では前記のごとく加硫に
先だち生カバーを予熱するが、予熱は前記のごと
く80℃、又はそれ以下、好ましくは70〜80℃の温
度で、加硫時間の約２倍程度の時間予熱する。ま
た加硫は予熱した生カバーを上下作動プレスに入
れて加熱硬化するが、プレスを閉鎖するに先だ
ち、金型を上下させて、生カバー中の空気を抜く
作業、いわゆるバギング作業を数回行う。なお本
発明では加硫工程、製造作業性の観点から生カバ
ーのスコーチタイム、及びムーニー粘度は所定の
数値、例えばスコーチタイムが５分以上、ムーニ
ー粘度が10以上であることが望ましい。 In addition, in the manufacturing method of the present invention, the raw cover is preheated prior to vulcanization as described above, and the preheating is performed at a temperature of 80°C or lower, preferably 70 to 80°C, and approximately twice the vulcanization time. Preheat for a certain amount of time. In addition, during vulcanization, the preheated green cover is placed in a vertically operating press and cured by heating, but before the press is closed, the mold is moved up and down to remove air from the green cover, a so-called bagging operation is performed several times. . In the present invention, the scorch time and Mooney viscosity of the raw cover are desirably set to predetermined values, for example, the scorch time is preferably 5 minutes or more and the Mooney viscosity is 10 or more from the viewpoint of the vulcanization process and manufacturing workability.
第１図は、従来の金型を示す断面図、第２図及
び第３図はムーニー粘度及びスコーチタイムと外
観不良発生率との関係を示す線図である。
FIG. 1 is a sectional view showing a conventional mold, and FIGS. 2 and 3 are diagrams showing the relationship between Mooney viscosity, scorch time, and appearance defect occurrence rate.
Claims (1)
し、しかる後プレス中で加硫硬化するニユーマチ
ツク型ソリツドタイヤの製造方法において、前記
生カバーは、ムーニー粘度（ML1+4、130℃）が
48以下かつスコーチタイムt10（min）が25以下に
調整されたことを特徴とするソリツドタイヤの製
造方法。1. In a method for manufacturing a pneumatic type solid tire in which a molded green cover is preheated at a temperature of 80°C or lower and then vulcanized and cured in a press, the green cover has a Mooney viscosity (ML 1+4 , 130°C).
48 or less and the scorch time t 10 (min) is adjusted to 25 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57212978A JPS59103736A (en) | 1982-12-03 | 1982-12-03 | Manufacture of solid tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57212978A JPS59103736A (en) | 1982-12-03 | 1982-12-03 | Manufacture of solid tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59103736A JPS59103736A (en) | 1984-06-15 |
| JPS6320700B2 true JPS6320700B2 (en) | 1988-04-28 |
Family
ID=16631442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57212978A Granted JPS59103736A (en) | 1982-12-03 | 1982-12-03 | Manufacture of solid tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59103736A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6463650B2 (en) * | 2015-03-27 | 2019-02-06 | 住友ゴム工業株式会社 | Cushion tire manufacturing method |
-
1982
- 1982-12-03 JP JP57212978A patent/JPS59103736A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59103736A (en) | 1984-06-15 |
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