JPH0124611B2 - - Google Patents
Info
- Publication number
- JPH0124611B2 JPH0124611B2 JP56009245A JP924581A JPH0124611B2 JP H0124611 B2 JPH0124611 B2 JP H0124611B2 JP 56009245 A JP56009245 A JP 56009245A JP 924581 A JP924581 A JP 924581A JP H0124611 B2 JPH0124611 B2 JP H0124611B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber sheet
- main drum
- drum
- steel belt
- vulcanized
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/006—Degassing moulding material or draining off gas during moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0277—Apparatus with continuous transport of the material to be cured
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2021/00—Use of unspecified rubbers as moulding material
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は、いわゆるロートキユア装置を用いて
加硫成形するゴムシートの連続加硫方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously vulcanizing a rubber sheet using a so-called roto-cure device.
従来、ロートキユア装置における加熱した回転
ドラムとこの外周に圧接させた無端スチールベル
トとの間に未加硫ゴムシートを喰い込ませて加圧
加熱を施し加硫を行なう方法は盛用されている
が、ゴムシートの肉厚が薄い場合にはこの方法に
おいてエヤーマークと俗称されるゴムシートの波
打現象を生じる欠点があつた。 Conventionally, a method has been widely used in which an unvulcanized rubber sheet is inserted between a heated rotating drum in a roto-cure device and an endless steel belt that is pressed against the outer periphery of the rotary drum, and the sheet is heated under pressure to perform vulcanization. However, when the rubber sheet is thin, this method has the disadvantage of causing a waving phenomenon of the rubber sheet, commonly known as air marks.
即ち、この波打現象は、ゴムシートＳの加熱加
圧の際にシートと型或いはドラムとの隙間に大気
を抱き込むことに起因して肉厚の一部が欠損(イ)す
る現象（第３図ａ参照）や加圧不足等に起因して
製品中に気泡(ロ)が残存してしまうエアー入りの現
象（第３図ｂ参照）と明確に区別されるもので、
ロートキユア装置においては、主ドラムの外周面
上にスチールベルトによつて圧迫されて加熱加硫
されるゴムシートが、加硫されて加圧状態から解
放された後も粘着性を有し、スチールベルトが主
ドラムの外周面を離脱しても主ドラムに粘着した
ままその外周面上を回転送りされたり（第２図参
照）、場合によつては、スチールベルトに粘着し
たまま進んで行くことを原因として生じるもので
ある。 In other words, this waving phenomenon is a phenomenon in which part of the thickness of the rubber sheet S is lost (a) due to air being trapped in the gap between the sheet and the mold or drum when the rubber sheet S is heated and pressurized. This is clearly distinguished from the phenomenon of air intrusion (see Figure 3 b), where air bubbles (b) remain in the product due to insufficient pressurization (see Figure 3 b).
In roto cure equipment, the rubber sheet that is pressed onto the outer peripheral surface of the main drum by a steel belt and heated and vulcanized remains sticky even after being vulcanized and released from the pressurized state. Even if the steel belt leaves the outer circumferential surface of the main drum, it may continue to rotate on the outer circumferential surface while adhering to the main drum (see Figure 2), or in some cases, it may continue to advance while adhering to the steel belt. It occurs as a cause.
つまり、スチールベルトが主ドラムを離脱して
ゴムシートに対する加圧状態が解除されると、加
硫の際に化学反応により内部に発生したガスがゴ
ムシートの両面から外部へ脱出する訳であるが、
この際ゴムシートの両面のうち主ドラムの外周面
やスチールベルトが当接していない面からは抵抗
なくガスがその全表面から速やかに均等に脱出で
きるのに対して、他方主ドラムの外周面やスチー
ルベルトと粘着している面では粘着程度の弱い部
分を狙つて一部分から集中的に脱出するようにな
り、この局部的なガスの脱出が主ドラムの外周面
又はスチールベルトとの間に背圧を生じさせるた
め、たとえゴムシートを撓まないように緊張して
いても薄肉のゴムシートを部分的に持ち上げ、第
３図ｃに示すように、ゴムシートＳの肉厚は全体
に亘つて均一であるが、その表面が波打つて凹凸
状(ハ)を呈する波打現象が引き起こされ、その平滑
精度や外観が損われたゴムシートの不良品の一態
様となつていた訳である。 In other words, when the steel belt leaves the main drum and the pressure on the rubber sheet is released, the gas generated inside due to the chemical reaction during vulcanization escapes to the outside from both sides of the rubber sheet. ,
At this time, gas can quickly and evenly escape from both sides of the rubber sheet without resistance from the outer peripheral surface of the main drum or the surface that is not in contact with the steel belt, while the other surface is On the surface that is in contact with the steel belt, the gas will escape concentratedly from one part, aiming at the weakly adhesive part, and this local escape of gas will cause back pressure between the outer peripheral surface of the main drum or the steel belt. In order to cause this, even if the rubber sheet is under tension so as not to bend, the thin rubber sheet is partially lifted so that the thickness of the rubber sheet S is uniform throughout, as shown in Figure 3c. However, this caused a waving phenomenon in which the surface became wavy and uneven (c), resulting in a defective rubber sheet whose smoothness and appearance were impaired.
このような波打現象を防止するために、主ドラ
ムの外周面やスチールベルトの表面に離型剤を塗
付して、加硫後ゴムシートが主ドラムやスチール
ベルトに粘着しないようにすることが行なわれて
いるが、粘着防止に完全を期し難いほか、高価な
離型剤を一日に数回塗付しなければならず、面倒
な作業を要する欠点があつた。 To prevent this kind of waving phenomenon, a release agent is applied to the outer peripheral surface of the main drum and the surface of the steel belt to prevent the rubber sheet from sticking to the main drum or steel belt after vulcanization. However, it is difficult to completely prevent sticking, and an expensive mold release agent must be applied several times a day, which is a tedious process.
本発明は叙上の如き欠点を解消するために創作
されたもので、スチールベルトが主ドラムを離脱
して加圧状態が解かれると同時に加硫されたゴム
シートが主ドラム及びスチールベルトのいずれに
も粘着せずに進行できるようにすることを目的と
するものである。 The present invention was created in order to solve the above-mentioned drawbacks, and at the same time when the steel belt leaves the main drum and the pressurized state is released, the vulcanized rubber sheet is removed from the main drum and the steel belt. The purpose is to allow you to proceed without getting stuck.
即ち、本発明は、主ドラム、補助ドラム、緊張
ドラム及びこれらのドラム間に緊張状態に掛け渡
され主ドラムの外周面を圧接しつつ走行する無端
スチールベルトとから成るロートキユア装置を用
いてゴムシートを加硫成形する方法であつて、主
ドラムと無端スチールベルトとの間に挾まれて主
ドラムの外周面上を主ドラムの回転方向に送られ
ながら加熱加圧され加硫されるゴムシートを加圧
状態が解放される際にその両面が同時に主ドラム
及び無端スチールベルトから離脱するように強制
的に引き取るようにしたゴムシートの連続加硫方
法を要旨とするものである。 That is, the present invention uses a roto-cure device consisting of a main drum, an auxiliary drum, a tension drum, and an endless steel belt that is stretched between these drums under tension and runs while pressing against the outer peripheral surface of the main drum. A method of vulcanization molding, in which a rubber sheet is sandwiched between a main drum and an endless steel belt, and is heated and pressurized and vulcanized while being fed on the outer peripheral surface of the main drum in the rotational direction of the main drum. The gist of this method is to continuously vulcanize a rubber sheet, in which both surfaces of the rubber sheet are forcibly removed from the main drum and the endless steel belt at the same time when the pressurized state is released.
以下、図面に示した本発明を実施するための装
置例に基づいて、本発明方法を説明する。 Hereinafter, the method of the present invention will be explained based on an example of an apparatus for carrying out the present invention shown in the drawings.
第１図は本発明の実施のためのゴムシート連続
加硫装置であり、加熱された主ドラム１、主ドラ
ム１の外周に接近して設けられた２個の補助ドラ
ム２，３及び主ドラム１の外周面を圧接しつつ走
行する無端スチールベルト５緊張させるを緊張ド
ラム４とでいわゆるロートキユア装置を構成し、
補助ドラム２が図示しない伝動装置により駆動し
て回転することにより、無端スチールベルト５の
走行に従つて主ドラム１、補助ドラム３及び緊張
ドラム４も回転するようになつている。 FIG. 1 shows a continuous rubber sheet vulcanization apparatus for implementing the present invention, which includes a heated main drum 1, two auxiliary drums 2 and 3 provided close to the outer periphery of the main drum 1, and a main drum. An endless steel belt 5 running while pressing against the outer circumferential surface of 1 and a tension drum 4 constitute a so-called roto cure device,
The auxiliary drum 2 is driven and rotated by a transmission device (not shown), so that the main drum 1, the auxiliary drum 3, and the tension drum 4 also rotate as the endless steel belt 5 runs.
そして、主ドラム１と補助ドラム２の外周に接
近した一定位置に回転ロール７が設けられ、この
回転ロール７は図示しない伝動装置により駆動回
転するようになつている。 A rotating roll 7 is provided at a fixed position close to the outer periphery of the main drum 1 and the auxiliary drum 2, and this rotating roll 7 is driven and rotated by a transmission device (not shown).
この回転ロール７は、任意の位置に設けられる
のでなく、無端スチールベルト５が主ドラム１の
外周面を離れる離脱点Ａの略接線方向の位置に設
けられ、加硫したゴムシートを一定のテンシヨン
で引き取ることが可能ないわゆるスリツプクラツ
チ等で形成されている。 This rotary roll 7 is not provided at an arbitrary position, but is provided at a position approximately tangential to the departure point A where the endless steel belt 5 leaves the outer peripheral surface of the main drum 1, and is used to hold the vulcanized rubber sheet under a certain tension. It is formed with a so-called slip clutch that can be pulled out.
いま、この装置の主ドラム１と補助ドラム３と
の間に加熱加圧すべき未加硫ゴムシート６を供給
すると、この未加硫ゴムシート６は主ドラム１と
無端スチールベルト５とに挾まれて主ドラム１の
外周面上を主ドラム１の回転方向に送られると共
にこの間において加熱加圧されて加硫ゴムシート
６′に形成される。 Now, when an unvulcanized rubber sheet 6 to be heated and pressurized is supplied between the main drum 1 and the auxiliary drum 3 of this device, this unvulcanized rubber sheet 6 is sandwiched between the main drum 1 and the endless steel belt 5. The vulcanized rubber sheet 6' is fed onto the outer circumferential surface of the main drum 1 in the direction of rotation of the main drum 1, and is heated and pressed during this time to form a vulcanized rubber sheet 6'.
そして、この加硫ゴムシート６′は、無端スチ
ールベルト５が主ドラム１の外周面を離脱して加
圧状態が解放されたとき、これと同時に回転ロー
ル７によつて離脱点Ａにおける略接線方向に強制
的に引き取られて行く。 Then, when the endless steel belt 5 leaves the outer peripheral surface of the main drum 1 and the pressurized state is released, the vulcanized rubber sheet 6' is simultaneously moved by the rotating roll 7 to a substantially tangential line at the release point A. They are forcibly taken in the same direction.
従つて、加硫ゴムシート６′は加圧状態が解放
された際主ドラム１及び無端スチールベルト５の
いずれにも粘着することなく、その両面が同時に
両者から離脱することができることになる。 Therefore, when the pressurized state is released, the vulcanized rubber sheet 6' does not stick to either the main drum 1 or the endless steel belt 5, and both surfaces thereof can be separated from both at the same time.
その結果、加硫時に発生したガスを加圧が解放
されたとき何ら邪魔されることなく、加硫ゴムシ
ート６′の両面においてその全表面から速やかに
かつ均等に脱出させることができ、ガスの部分的
かつ集中的な脱出に伴なう背圧によりゴムシート
が持ち上げられ凹凸状になる波打現象を完全に阻
止できるに至つたものである。 As a result, when the pressure is released, the gas generated during vulcanization can quickly and evenly escape from the entire surface of the vulcanized rubber sheet 6' on both sides without any hindrance. This has made it possible to completely prevent the waving phenomenon in which the rubber sheet is lifted and becomes uneven due to the back pressure associated with partial and concentrated evacuation.
尚、回転ロール７によつて引き取られた加硫ゴ
ムシート６′はその後補助ドラム２の外周に掛け
られ、緊張ロール４側で製品として捲き取られて
いくことになる。 The vulcanized rubber sheet 6' taken up by the rotating roll 7 is then wrapped around the outer periphery of the auxiliary drum 2 and rolled up as a product on the tension roll 4 side.
以上のとおり、本発明は、ゴムシートの加硫の
際における従来の問題点を解決し、ゴムシートの
品質向上に寄与するところが極めて大きいもので
ある。 As described above, the present invention solves the conventional problems in vulcanizing rubber sheets, and greatly contributes to improving the quality of rubber sheets.
第１図は本発明を実施するための装置例を示す
概略側面図、第２図は従来の状態を示す部分拡大
図、第３図はゴムシートの不良状態を示す説明図
である。
１……主ドラム、２，３……補助ドラム、５…
…無端スチールベルト、７……回転ロール。
FIG. 1 is a schematic side view showing an example of an apparatus for implementing the present invention, FIG. 2 is a partially enlarged view showing a conventional state, and FIG. 3 is an explanatory diagram showing a defective state of a rubber sheet. 1... Main drum, 2, 3... Auxiliary drum, 5...
...Endless steel belt, 7...Rotating roll.
Claims (1)
らのドラム間に緊張状態に掛け渡され主ドラムの
外周面を圧接しつつ走行する無端スチールベルト
とから成るロートキユア装置を用いてゴムシート
を加硫成形する方法であつて、主ドラムと無端ス
チールベルトとの間に挾まれて主ドラムの外周面
上を主ドラムの回転方向に送られながら加熱加圧
され加硫されるゴムシートを加圧状態が解放され
る際にその両面が同時に主ドラム及び無端スチー
ルベルトから離脱するように強制的に引き取るよ
うにしたことを特徴とするゴムシートの連続加硫
方法。1. A rubber sheet is vulcanized and molded using a roto cure device consisting of a main drum, an auxiliary drum, a tension drum, and an endless steel belt that is stretched between these drums under tension and runs while pressing against the outer peripheral surface of the main drum. A method in which a rubber sheet is sandwiched between a main drum and an endless steel belt and is heated and pressurized and vulcanized while being fed on the outer peripheral surface of the main drum in the direction of rotation of the main drum, and the pressurized state is released. A continuous vulcanization method for a rubber sheet, characterized in that when the rubber sheet is removed, both sides of the rubber sheet are forcibly removed from a main drum and an endless steel belt at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56009245A JPS57123037A (en) | 1981-01-23 | 1981-01-23 | Rotary drum type continuous curing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56009245A JPS57123037A (en) | 1981-01-23 | 1981-01-23 | Rotary drum type continuous curing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57123037A JPS57123037A (en) | 1982-07-31 |
| JPH0124611B2 true JPH0124611B2 (en) | 1989-05-12 |
Family
ID=11715017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56009245A Granted JPS57123037A (en) | 1981-01-23 | 1981-01-23 | Rotary drum type continuous curing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57123037A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002248643A (en) * | 2001-02-23 | 2002-09-03 | Nitto Kako Kk | Manufacturing method of patterned rubber sheet |
-
1981
- 1981-01-23 JP JP56009245A patent/JPS57123037A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57123037A (en) | 1982-07-31 |
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