JPH0530616B2 - - Google Patents
Info
- Publication number
- JPH0530616B2 JPH0530616B2 JP59072214A JP7221484A JPH0530616B2 JP H0530616 B2 JPH0530616 B2 JP H0530616B2 JP 59072214 A JP59072214 A JP 59072214A JP 7221484 A JP7221484 A JP 7221484A JP H0530616 B2 JPH0530616 B2 JP H0530616B2
- Authority
- JP
- Japan
- Prior art keywords
- tire
- rubber strip
- molded
- extruder
- speed
- 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 - Lifetime
Links
- 238000000465 moulding Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 24
- 238000001125 extrusion Methods 0.000 claims description 12
- 238000007796 conventional method Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000003190 viscoelastic substance Substances 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
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
- B29D30/58—Applying bands of rubber treads, i.e. applying camel backs
- B29D30/62—Applying bands of rubber treads, i.e. applying camel backs by extrusion or injection of the tread on carcass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Tyre Moulding (AREA)
Description
【発明の詳細な説明】
本発明は押出機を用いるタイヤ成形方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire molding method using an extruder.
従来、押出機から押出されたゴムストリツプ
は、ダンサーローラを通りタイヤ成形機上に懸架
された被成形タイヤの周上に貼付けられるのが常
であつた。ダンサーローラが下降すれば被成形タ
イヤの回転速度を速くし、ダンサーローラが上昇
すると被成形タイヤの回転速度を遅くすることに
よつてゴムストリツプの押出速度に対して被成形
タイヤの回転速度を制御している。従つて、ゴム
ストリツプの押出速度の変化に対しては被成形タ
イヤの回転速度を制御しているが、ゴムストリツ
プの幅の変化と厚さの変化のように、ゴムストリ
ツプの進行方向と直交する横断面の形状の変化に
対しては制御していない。この結果、ゴムストリ
ツプの横断面形状の意図されない変化が被成形タ
イヤの成形後のタイヤの形状や重量の変化とな
り、この繰返しによつて製造される成形タイヤに
形状や重量等の品質のバラツキができるという欠
点がある。また、ゴムストリツプの横断面形状を
安定化する方法として、ローラダイを使用する押
出方式においては、ゴムストリツプの幅をカメラ
で撮影して、ローラダイの回転を制御するという
方法がある。また、口金を使用する押出方式にお
いても、ゴムストリツプの幅をカメラで撮影し、
被成形タイヤの回転を制御することが可能であ
り、また、ゴムストリツプの厚さを直接ダイヤル
ゲージ、または、厚さ測定のセンサで読取りなが
ら被成形タイヤの回転を制御するという方法もあ
る。しかし、このように、ゴムストリツプの幅や
厚さのバラツキをカメラ、ダイヤルゲージやセン
サによつて読取り、被成形タイヤの回転を制御す
る方法は複雑で高価な装置を必要とする欠点があ
る。 In the past, the rubber strip extruded from an extruder passed through dancer rollers and was applied to the circumference of a tire to be molded suspended on a tire molding machine. When the dancer roller is lowered, the rotational speed of the tire to be molded is increased, and when the dancer roller is raised, the rotational speed of the tire to be molded is slowed down, thereby controlling the rotational speed of the tire to be molded relative to the extrusion speed of the rubber strip. ing. Therefore, the rotational speed of the tire to be molded is controlled in response to changes in the extrusion speed of the rubber strip, but changes in the width and thickness of the rubber strip, such as changes in the width and thickness of the rubber strip, are controlled by changing the extrusion speed of the rubber strip. Changes in shape are not controlled. As a result, unintended changes in the cross-sectional shape of the rubber strip result in changes in the shape and weight of the tire after molding, and this repetition causes variations in quality, such as shape and weight, of the molded tires manufactured. There is a drawback. Further, as a method for stabilizing the cross-sectional shape of the rubber strip, in an extrusion method using a roller die, there is a method of photographing the width of the rubber strip with a camera and controlling the rotation of the roller die. Also, in the extrusion method that uses a die, the width of the rubber strip is photographed with a camera, and
It is possible to control the rotation of the tire to be molded, and there is also a method of controlling the rotation of the tire to be molded while reading the thickness of the rubber strip directly with a dial gauge or a sensor for measuring thickness. However, this method of controlling the rotation of the tire to be molded by reading variations in the width and thickness of the rubber strip using a camera, dial gauge, or sensor has the drawback of requiring complicated and expensive equipment.
一方、通常のトラツクやバス用タイヤの成形の
場合には、幅20〜40mm、厚さ２〜４mmの断面長方
形ないしは台形のゴムストリツプを使用してい
る。このようなゴムストリツプを使用して、成形
後のタイヤの形状や重量のバラツキの少い良い品
質のタイヤを得るためには、ゴムストリツプを幅
１mm以下、厚さ0.1mm以下の精度で押出すことが
必要である。この精度を得るためにはさらにその
１／１０の検出精度を有する高価な検出器を必要とす
る欠点がある。 On the other hand, in the case of molding ordinary truck and bus tires, rubber strips with a rectangular or trapezoidal cross section, 20 to 40 mm wide and 2 to 4 mm thick, are used. In order to use such rubber strips to obtain high-quality tires with little variation in tire shape and weight after molding, it is necessary to extrude the rubber strips with an accuracy of 1 mm or less in width and 0.1 mm or less in thickness. is necessary. In order to obtain this accuracy, there is a further drawback that an expensive detector having a detection accuracy of 1/10 is required.
このような欠点を除去するために、本発明はな
されたものであつて、押出されたゴムストリツプ
の形状の意図されない変化を抑えることにより、
成形後のタイヤの形状または、重量の変化を減少
し、成形タイヤの品質の安定を簡単な方法で、か
つ、安価に達成することを目的とする。 In order to eliminate such drawbacks, the present invention has been made, and by suppressing unintended changes in the shape of the extruded rubber strip,
To reduce changes in the shape or weight of a tire after molding and to stabilize the quality of the molded tire in a simple manner and at low cost.
このような本発明の目的は以下のような構成に
より達成することができる。すなわち、本発明
は、押出機から押出されたタイヤトレツド用のゴ
ムストリツプを、支持台上に懸架された被成形タ
イヤの回転によつて引取つて該タイヤの周上に貼
付けるタイヤ成形方法において、前記ゴムストリ
ツプを、被成形タイヤの所定の回転数によつて定
まり、前記押出機から押出されるゴムストリツプ
の押出速度に影響されない引取速度で引取ること
を特徴とする押出機を用いるタイヤ成形方法であ
る。 The purpose of the present invention can be achieved by the following configuration. That is, the present invention provides a tire molding method in which a rubber strip for a tire tread extruded from an extruder is taken up by the rotation of a tire to be molded suspended on a support base and pasted on the circumference of the tire. This is a tire molding method using an extruder, characterized in that the rubber strip is taken at a take-up speed that is determined by a predetermined rotational speed of the tire to be molded and is not affected by the extrusion speed of the rubber strip extruded from the extruder.
以下、本発明の一実施例を図面に基づいて説明
する。第１図は、本発明に係る押出機を用いるタ
イヤ成形方法を実施するタイヤ成形装置の概略側
面図である。 Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 is a schematic side view of a tire molding apparatus that carries out a tire molding method using an extruder according to the present invention.
まず、構成を説明すると、第１図において、１
はタイヤ成形装置であり、被成形タイヤ２はタイ
ヤ成形装置１の支持台３の上に懸架され、押出機
４の口金６より押出されるゴムストリツプ５は被
成形タイヤ２の回転によつて引取られながらその
周上に貼付けられる。被成形タイヤ２の回転によ
るゴムストリツプ５の引取速度は、押出機４より
押出されるゴムストリツプ５の押出速度に影響さ
れないで、ゴムストリツプ５の形状のバラツキを
最小にするような、被成形タイヤの所定の回転数
によつて定まる所定の速度であり、速度コントロ
ール装置７により制御される。また、引取速度は
常にゴムストリツプの押出速度よりも大きくし、
押出されたゴムストリツプに常にテンシヨンがか
かるようにする。第２図ａおよび第２図ｂは、従
来の方法により押出機４の口金６から押出された
ゴムストリツプ５の膨張による形状の変化を縦断
面図で示したものである。第２図ａにおいては、
口金６内の位置Ａ，Ｂ間にあるゴムが口金６を出
た直後にゴムの流れ方向と垂直な方向に急速に膨
張して、位置Ｃ、Ｄ間でゴムの長さが短縮してい
る。一方、第２図ｂにおいては、口金６内の位置
Ａ、Ｂ間（位置Ａ、Ｂの長さは第２図ａおよび第
２図ｂにおいて等しい。）にあるゴムは口金６を
出てからの膨張が小さく、ゴムの長さは位置Ｅ、
Ｆ間の長さとなり、第２図ａの位置Ｃ、Ｄ間より
短縮が少ない。押出機４から押出された瞬間のゴ
ムスリツプ５の押出速度が同じでも膨張の相違か
ら、押出されたゴムストリツプ５の流れ方向長さ
に相違が生ずる。このように、ゴムのような粘弾
性体が押出された時の流れ方向長さに相違を生ず
る原因は、押出機の運転条件の変動、ゴムの品質
のバラツキその他原因不明のものもあり、押出し
直後の膨張率を一定にすることは、非常に困難で
ある。ここで、押出機の定常状態において、口金
６から出た直後の膨張率に差があつても、単位時
間当りに押出されるゴムストリツプ５の体積は、
ほぼ等しい。したがつて、ゴムストリツプ５を一
定の引取速度で引取ると同じ厚さのゴムストリツ
プを得ることができる。さらに、ゴムストリツプ
５の膨張によるバラツキを最小にするために、膨
張率が最も小さい時の押出速度（テンシヨンがか
からない状態での、定常状態、つまり膨張後のゴ
ムスリツプの流れ方向速度）より大きな所定の引
取速度でゴムストリツプ５を引取る。この引取速
度は被成形タイヤの回転速度によつて決定され
る。また被成形タイヤの回転速度は被成形タイヤ
のタイヤサイズ、パターンおよびクラウン部の形
状の相違に応じて、個別に所定の引取速度になる
ように決定される。被成形タイヤの回転速度は、
成形の開始から終了まで一定でもよく、また変動
させてもよいが、同一仕様のタイヤを量産する際
の各タイヤ間においては回転速度の変動のパター
ンは一定とする。 First, to explain the configuration, in Figure 1, 1
is a tire molding device, a tire 2 to be molded is suspended on a support base 3 of the tire molding device 1, and a rubber strip 5 extruded from a mouthpiece 6 of an extruder 4 is taken off by the rotation of the tire 2 to be molded. It is pasted on its circumference. The take-up speed of the rubber strip 5 due to the rotation of the molded tire 2 is not affected by the extrusion speed of the rubber strip 5 extruded from the extruder 4, and is set at a predetermined speed of the molded tire so as to minimize the variation in the shape of the rubber strip 5. This is a predetermined speed determined by the number of rotations, and is controlled by a speed control device 7. Also, the take-off speed should always be greater than the extrusion speed of the rubber strip.
Ensure that the extruded rubber strip is under tension at all times. FIGS. 2a and 2b are longitudinal cross-sectional views showing changes in shape due to expansion of the rubber strip 5 extruded from the die 6 of the extruder 4 by a conventional method. In Figure 2a,
Immediately after the rubber between positions A and B in the mouthpiece 6 leaves the mouthpiece 6, it rapidly expands in a direction perpendicular to the direction of rubber flow, and the length of the rubber between positions C and D is shortened. . On the other hand, in FIG. 2b, the rubber located between positions A and B in the cap 6 (the lengths of positions A and B are equal in FIGS. 2a and 2b) is removed after leaving the cap 6. expansion is small, the length of the rubber is at position E,
This is the length between positions F, which is less shortened than between positions C and D in Figure 2a. Even if the extrusion speed of the rubber strip 5 is the same at the moment it is extruded from the extruder 4, the length of the extruded rubber strip 5 in the machine direction differs due to the difference in expansion. In this way, the causes of differences in the length in the machine direction when a viscoelastic material such as rubber is extruded include fluctuations in the operating conditions of the extruder, variations in the quality of the rubber, and other unknown causes. It is very difficult to keep the expansion rate constant immediately after. Here, in the steady state of the extruder, even if there is a difference in the expansion rate immediately after exiting from the nozzle 6, the volume of the rubber strip 5 extruded per unit time is:
Almost equal. Therefore, if the rubber strip 5 is taken off at a constant take-off speed, a rubber strip of the same thickness can be obtained. Furthermore, in order to minimize variations due to the expansion of the rubber strip 5, a predetermined withdrawal rate higher than the extrusion speed at the lowest expansion rate (in the steady state without tension, that is, the machine direction velocity of the rubber strip after expansion) is required. Take off the rubber strip 5 at high speed. This take-up speed is determined by the rotational speed of the tire to be formed. Further, the rotational speed of the tire to be molded is individually determined to a predetermined take-up speed depending on the tire size, pattern, and shape of the crown portion of the tire to be molded. The rotational speed of the tire to be molded is
Although it may be constant from the start to the end of molding or may be varied, the pattern of variation in rotational speed is constant between tires when mass producing tires with the same specifications.
次に、本発明に係るタイヤ成形方法と従来のタ
イヤ成形方法との比較例について説明する。第１
図の成形装置１を用いた本発明に係るタイヤ成形
方法および速度コントロール装置７を用いる代り
に被成形タイヤ２と押出機４の口金６との間にダ
ンサーローラを介してゴムストリツプの貼付を行
う従来のタイヤ成形方法により、それぞれサイズ
10.00R20のタイヤ80本ずつの成形を行い、各製
品タイヤ間でのトレツドゴム重量のバラツキを比
較した。その結果、本発明の方法により成形した
場合は、その変動係数3σ／（σ：標準偏差、
ｘ：トレツドゴム重量の平均値）が、従来の方法
により成形した場合を指数100として38であつた。
これは本発明によればトレツドゴム重量のバラツ
キが著しく小さくなることを示している。また、
本発明の方法によつた場合は、従来の方法によつ
た場合に比べ、トレツドゴム重量の平均値の目標
値に対するズレも著しく小さくなつていた。さら
に、従来の方法によつた場合は、スポンジ、バツ
クルあるいはベアといつた不良を有する製品タイ
ヤが散見されたが、本発明の方法によつた場合は
このような不良を有する製品タイヤは皆無であつ
た。 Next, a comparative example between the tire molding method according to the present invention and a conventional tire molding method will be described. 1st
The tire molding method according to the present invention using the molding apparatus 1 shown in the figure and the conventional method in which a rubber strip is pasted between the tire to be molded 2 and the mouthpiece 6 of the extruder 4 via a dancer roller instead of using the speed control device 7. Depending on the tire molding method, each size
We molded 80 10.00R20 tires and compared the variation in tread rubber weight between each product tire. As a result, when molded by the method of the present invention, the coefficient of variation is 3σ/(σ: standard deviation,
x: average value of treaded rubber weight) was 38, with an index of 100 when molded by the conventional method.
This shows that according to the present invention, the variation in the weight of the tread rubber is significantly reduced. Also,
When the method of the present invention was used, the deviation of the average value of the tread rubber weight from the target value was also significantly smaller than when the conventional method was used. Furthermore, when the conventional method was used, some product tires were found to have defects such as spongy, buckled, or bare defects, but when the method of the present invention was used, there were no product tires with such defects. It was hot.
また、第３図ａにおいて、本発明に係るタイヤ
成形方法を実施した場合に、ゴムストリツプの厚
さのバラツキが少ないことを示した。タイヤサイ
ズは1000−20で、押出機からゴムストリツプを、
タイヤ５本分連続して引取り、ゴムストリツプの
厚さの変化を試験した。１本の線９は押出機から
引取られるタイヤ１本のゴムストリツプの厚さの
変化をタイヤ成形の開始から終了まで示してい
る。第３図ｂにおいて、従来のダンサーローラを
仕様したタイヤ成形方法を実施した場合の、ゴム
ストリツプの厚さの変化１０が示してある。第３
図ａにおいて、５本の線のタイヤ成形の開始から
終了までのバラツキが第３図ｂにおけるバラツキ
より著しく小さいことがわかる。さらに、この試
験においてゴムストリツプを引取り後、その重量
のバラツキを変動係数3σ／で比較したところ、
タイヤの本数はそれぞれ５と少ないものの、従来
の方法によつた場合を指数100として本発明の方
法によつた場合は13であり、ゴムストリツプの重
量のバラツキが激減していた。即ち、本発明に係
るタイヤ成形方法による場合には、ゴムストリツ
プの厚さのバラツキも、重量のバラツキも、共に
大幅に向上している。 Furthermore, FIG. 3a shows that when the tire molding method according to the present invention is carried out, there is little variation in the thickness of the rubber strip. The tire size is 1000-20, and the rubber strip is made from an extruder.
Five tires were taken in succession and the change in the thickness of the rubber strip was tested. A line 9 shows the variation in the thickness of the rubber strip of a single tire taken from the extruder from the beginning to the end of tire molding. In FIG. 3b, the variation 10 in the thickness of the rubber strip is shown when a tire molding method using a conventional dancer roller is implemented. Third
In Figure a, it can be seen that the variation in the five lines from the start to the end of tire building is significantly smaller than the variation in Figure 3b. Furthermore, in this test, after taking the rubber strips, the weight variations were compared using a coefficient of variation of 3σ/.
Although the number of tires was small at 5 each, the index was 100 when the conventional method was used, and the index was 13 when the method of the present invention was used, and the variation in the weight of the rubber strips was drastically reduced. That is, in the case of the tire molding method according to the present invention, both the thickness variation and the weight variation of the rubber strips are significantly reduced.
以上、説明したように、本発明によれば、押し
出されたトレツド用のゴムストリツプの形状の意
図されない変化を抑えることにより、成形後のタ
イヤの形状または、重量の変化が減少し、成形タ
イヤの品質の安定を簡単な方法を用いて、かつ、
安価に達成することができる。 As explained above, according to the present invention, by suppressing unintended changes in the shape of the extruded rubber strip for tread, changes in the shape or weight of the tire after molding are reduced, and the quality of the molded tire is reduced. using a simple method, and
This can be achieved at low cost.
第１図は本発明に係る押出機を用いるタイヤ成
形方法を実施するタイヤ成形装置の概略側面図、
第２図ａ，ｂはそれぞれ、従来の方法による押出
機を出たゴムストリツプの膨張状態を示す図、第
３図ａ，ｂはそれぞれ、本発明および従来の方法
によるゴムストリツプの厚さの変化を示すグラフ
である。
２……被成形タイヤ、３……支持台、４……押
出機、５……ゴムストリツプ。
FIG. 1 is a schematic side view of a tire molding apparatus that carries out a tire molding method using an extruder according to the present invention;
Figures 2a and b show the state of expansion of the rubber strip after leaving the extruder according to the conventional method, and Figures 3a and b show the changes in the thickness of the rubber strip according to the present invention and the conventional method, respectively. It is a graph. 2... Tire to be molded, 3... Support stand, 4... Extruder, 5... Rubber strip.
Claims (1)
ムストリツプを、支持台上に懸架された被成形タ
イヤの回転により引取つて該タイヤの周上に貼付
けるタイヤ成形方法において、前記ゴムストリツ
プを、被成形タイヤの所定の回転数によつて定ま
り、前記押出機から押出されるゴムストリツプの
押出速度に影響されない引取速度で引取ることを
特徴とする押出機を用いるタイヤ成形方法。 ２ 前記引取速度は常に前記ゴムストリツプの押
出速度よりも大きいことを特徴とする特許請求の
範囲第１項記載の押出機を用いるタイヤ成形方
法。[Scope of Claims] 1. A tire molding method in which a rubber strip for a tire tread extruded from an extruder is picked up by rotation of a tire to be molded suspended on a support stand, and is pasted on the circumference of the tire. A tire molding method using an extruder, characterized in that the rubber strip is taken at a take-up speed that is determined by a predetermined rotational speed of the tire to be molded and is not affected by the extrusion speed of the rubber strip extruded from the extruder. 2. A tire molding method using an extruder according to claim 1, wherein the take-up speed is always higher than the extrusion speed of the rubber strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59072214A JPS60214935A (en) | 1984-04-10 | 1984-04-10 | Tire forming utilizing extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59072214A JPS60214935A (en) | 1984-04-10 | 1984-04-10 | Tire forming utilizing extruder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60214935A JPS60214935A (en) | 1985-10-28 |
| JPH0530616B2 true JPH0530616B2 (en) | 1993-05-10 |
Family
ID=13482768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59072214A Granted JPS60214935A (en) | 1984-04-10 | 1984-04-10 | Tire forming utilizing extruder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60214935A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01103422A (en) * | 1987-10-16 | 1989-04-20 | Bridgestone Corp | Guiding device of extrusion material |
| DE69919233T3 (en) * | 1999-11-19 | 2010-12-30 | Pirelli Tyre S.P.A. | METHOD FOR PRODUCING TIRE COMPONENTS FROM ELASTOMERIC MATERIAL |
| JP4156871B2 (en) * | 2002-06-20 | 2008-09-24 | 株式会社ブリヂストン | Tire member molding apparatus and molding method |
| JP4731210B2 (en) * | 2005-06-06 | 2011-07-20 | 株式会社ブリヂストン | Rubber strip lamination molding method |
| JP5144174B2 (en) * | 2007-08-28 | 2013-02-13 | 住友ゴム工業株式会社 | Pneumatic tire and manufacturing method thereof |
| JP5204442B2 (en) * | 2007-08-28 | 2013-06-05 | 住友ゴム工業株式会社 | Pneumatic tire and manufacturing method thereof |
| JP6758220B2 (en) * | 2017-02-21 | 2020-09-23 | 株式会社ブリヂストン | Winding method and device for band-shaped rubber member |
-
1984
- 1984-04-10 JP JP59072214A patent/JPS60214935A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60214935A (en) | 1985-10-28 |
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