JP5721979B2 - Method for surface modification of unvulcanized rubber - Google Patents
Method for surface modification of unvulcanized rubber Download PDFInfo
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- JP5721979B2 JP5721979B2 JP2010184385A JP2010184385A JP5721979B2 JP 5721979 B2 JP5721979 B2 JP 5721979B2 JP 2010184385 A JP2010184385 A JP 2010184385A JP 2010184385 A JP2010184385 A JP 2010184385A JP 5721979 B2 JP5721979 B2 JP 5721979B2
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- 229920001971 elastomer Polymers 0.000 title claims description 117
- 239000005060 rubber Substances 0.000 title claims description 117
- 238000000034 method Methods 0.000 title claims description 17
- 238000012986 modification Methods 0.000 title description 6
- 230000004048 modification Effects 0.000 title description 6
- 239000000126 substance Substances 0.000 claims description 16
- 230000002401 inhibitory effect Effects 0.000 claims description 14
- 230000001678 irradiating effect Effects 0.000 claims description 7
- 238000002715 modification method Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 238000005304 joining Methods 0.000 description 4
- 239000004636 vulcanized rubber Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000341 volatile oil Substances 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Tyre Moulding (AREA)
Description
本発明は、未加硫ゴムの表面改質方法に関する。 The present invention relates to a method for modifying the surface of unvulcanized rubber.
未加硫ゴムを組み立てる工程、例えば、タイヤの製造工程では、未加硫ゴムを貼り合わせたり、ジョイントする工程がある（例えば、特許文献１参照）。 In a process of assembling unvulcanized rubber, for example, in a tire manufacturing process, there is a process of bonding unvulcanized rubber or jointing (for example, see Patent Document 1).
未加硫ゴム同士を貼り合わせたり、ジョイントする際には、未加硫ゴム表面の粘着性が求められる。即ち、組み立てられた物がモールドで加硫される前に、貼り合せ箇所やジョイント箇所が剥れたり、ずれたりしないように未加硫ゴム同士の密着力が必要となっている。 When the unvulcanized rubbers are bonded together or jointed, the tackiness of the unvulcanized rubber surface is required. That is, before the assembled product is vulcanized with a mold, the adhesion between the unvulcanized rubbers is required so that the bonded part and the joint part do not peel off or shift.
ゴム押出機から押し出された直後の未加硫ゴムは、ある程度大きな粘着性を有しているが、ゴム押出機から押し出された未加硫ゴムを放置すると、経時変化により、脂肪酸亜鉛、ワックス類等の配合剤がゴム表面に移行して析出する場合がある（ブルームと呼ばれる。）。 The unvulcanized rubber immediately after being extruded from the rubber extruder has a certain degree of stickiness. However, if the unvulcanized rubber extruded from the rubber extruder is left as it is, the fatty acid zinc, In some cases, a compounding agent such as the like migrates to the rubber surface and precipitates (referred to as bloom).
未加硫ゴムの表面にブルームが生ずると、未加硫ゴムの粘着性が低下する問題があり、未加硫ゴム同士を貼り合せたりジョイントした後に剥れる場合がある。なお、粘着性は低くとも、剥れなければその後の加硫工程で未加硫ゴム同士は接着される。 When bloom occurs on the surface of the unvulcanized rubber, there is a problem that the adhesiveness of the unvulcanized rubber is lowered, and the unvulcanized rubber may be peeled off after being bonded or jointed. Even if the tackiness is low, the unvulcanized rubbers are bonded to each other in the subsequent vulcanization step if they do not peel off.
未加硫ゴム同士を密着させるために、ゴムセメントを塗布して粘着力を向上させる技術がある。貼り合せ部分やジョイント部分の未加硫ゴム同士の密着力を確保する目的でセメント塗布を行おうとするとゴム揮発油（ガソリン）等の溶剤化学成分が必要となるが、溶剤化学成分が大気中に揮発する問題がある。 In order to bring unvulcanized rubber into close contact with each other, there is a technique for improving adhesive strength by applying rubber cement. Solvent chemical components such as rubber volatile oil (gasoline) are required to apply cement for the purpose of securing the adhesion between unvulcanized rubber at the bonded part and joint part. There is a problem of volatilization.
一方、未加硫ゴムの端部をカットしてフレッシュ面を露出させ、未加硫ゴム本来の粘着力を得る方法では、カットした部材の端部は再利用できず、産業廃棄物となってしまい、材料の無駄となる。 On the other hand, in the method of cutting the end of unvulcanized rubber to expose the fresh surface and obtaining the original adhesive strength of unvulcanized rubber, the end of the cut member cannot be reused and becomes industrial waste. This is a waste of materials.
本発明は、上記問題を解決すべく成されたもので、従来技術の問題を解決し、未加硫ゴム部材組立工程に必要な未加硫ゴム同士の密着力を確保することのできる未加硫ゴムの表面改質方法を提供することが目的である。 The present invention has been made to solve the above-mentioned problems. It is an unadded rubber that can solve the problems of the prior art and can secure the adhesion between the unvulcanized rubbers necessary for the unvulcanized rubber member assembly process. It is an object to provide a method for modifying the surface of vulcanized rubber.
請求項１に記載の未加硫ゴムの表面改質方法は、帯状の未加硫ゴム同士をドラムに巻き付け、前記未加硫ゴムの長手方向一端側の表面と長手方向他端側の裏面とを重ねて接合する前に、前記未加硫ゴムの前記表面に第１のレーザー照射装置で第１のレーザー光を照射し、前記未加硫ゴムの前記裏面に第２のレーザー照射装置で第２のレーザー光を照射し、前記表面、及び前記裏面に付着している未加硫ゴム同士の密着力を阻害する密着阻害物質を前記第１のレーザー光、及び前記第２のレーザー光の照射により除去して、未加硫ゴム同士の密着力を確保する様に前記表面と前記裏面を改質する。 The surface modification method for unvulcanized rubber according to claim 1, wherein the belt-shaped unvulcanized rubber is wound around a drum, the surface of one end side in the longitudinal direction of the unvulcanized rubber and the back surface on the other end side in the longitudinal direction. Before the first and second laser irradiation devices irradiate the first surface of the unvulcanized rubber with a first laser irradiation device, and the second laser irradiation device applies the second laser irradiation device to the back surface of the unvulcanized rubber. Irradiation of the first laser beam and the second laser beam is performed by irradiating the first laser beam and the second laser beam with an irradiation inhibitor that inhibits the adhesion force between the unvulcanized rubber adhering to the front surface and the back surface. The front surface and the back surface are modified so as to secure the adhesion between the unvulcanized rubbers.
次に、請求項１に記載の未加硫ゴムの表面改質方法を説明する。
帯状の未加硫ゴム同士をドラムに巻き付け、未加硫ゴムの長手方向一端側の表面と長手方向他端側の裏面とを重ねて接合する前に、未加硫ゴムの表面に第１のレーザー照射装置で第１のレーザー光を照射し、未加硫ゴムの前記裏面に第２のレーザー照射装置で第２のレーザー光を照射することで、接合予定部位の表面に付着している未加硫ゴム同士の密着力を阻害する密着阻害物質が除去されて接合予定部位のゴム表面を改質することができ、未加硫ゴム同士の密着力を確保することができる。
Next, a method for modifying the surface of the unvulcanized rubber according to claim 1 will be described.
Before the belt-shaped unvulcanized rubber is wound around the drum and the surface of the unvulcanized rubber at one end in the longitudinal direction and the back surface at the other end in the longitudinal direction are overlapped and joined, irradiating a first laser beam at a laser irradiation device, non-adhering to the unvulcanized by irradiating the second laser beam at the second laser irradiation apparatus to the rear surface of the vulcanized rubber, the surface of the predetermined joining portions The adhesion-inhibiting substance that inhibits the adhesion between the vulcanized rubbers is removed , the rubber surface of the part to be bonded can be modified, and the adhesion between the unvulcanized rubbers can be ensured.
請求項２に記載の発明は、請求項１に記載の未加硫ゴムの表面改質方法において、前記第１のレーザー光、及び前記第２のレーザー光は、波長が０．８〜０．９μｍであり、前記表面、及び前記裏面において、前記第１のレーザー光、及び前記第２のレーザー光の照射密度が３〜４Ｗ／ｃｍ２、前記第１のレーザー光、及び前記第２のレーザー光の照射時間が０．２〜０．６ｓｅｃの範囲内である。 The invention according to claim 2 is the surface modification method for unvulcanized rubber according to claim 1 , wherein the first laser beam and the second laser beam have a wavelength of 0.8-0. 9 μm, and irradiation density of the first laser light and the second laser light is 3 to 4 W / cm 2 on the front surface and the back surface, the first laser light, and the second laser. The irradiation time of light is in the range of 0.2 to 0.6 sec.
次に、請求項２に記載の未加硫ゴムの表面改質方法を説明する。
波長０．８〜０．９μｍのレーザー光をゴム表面に照射し、ゴム表面におけるレーザー光の単位面積当たりの照射密度を３〜４Ｗ／ｃｍ２、照射時間を０．２〜０．６ｓｅｃの範囲内とすることで、ゴム表面の密着阻害物質を効率的に除去することができる。
Next, a method for modifying the surface of the unvulcanized rubber according to claim 2 will be described .
Laser light with a wavelength of 0.8 to 0.9 μm is irradiated on the rubber surface, the irradiation density per unit area of the laser light on the rubber surface is 3 to 4 W / cm 2 , and the irradiation time is in the range of 0.2 to 0.6 sec. By setting it inside, the adhesion inhibiting substance on the rubber surface can be efficiently removed.
なお、照射密度が３Ｗ／ｃｍ２未満、かつ照射時間が０．２ｓｅｃ未満では、密着阻害物質を低減乃至除去するにはエネルギーが不足気味となる。
一方、照射密度が４Ｗ／ｃｍ２を超え、かつ照射時間が０．６ｓｅｃを超えると、未加硫ゴム表面の温度上昇により未加硫ゴムが加硫する虞がある。
If the irradiation density is less than 3 W / cm 2 and the irradiation time is less than 0.2 sec, energy is insufficient to reduce or remove the adhesion-inhibiting substance.
On the other hand, if the irradiation density exceeds 4 W / cm 2 and the irradiation time exceeds 0.6 sec, the unvulcanized rubber may be vulcanized due to the temperature rise of the unvulcanized rubber surface.
なお、レーザー光の波長を０．８〜０．９μｍの範囲内とすることで、密着阻害物質を効率的に低減乃至除去することができる。 In addition, by setting the wavelength of the laser light within the range of 0.8 to 0.9 μm, the adhesion-inhibiting substance can be efficiently reduced or removed.
以上説明したように本発明の未加硫ゴムの表面改質方法によれば、ゴム揮発油を大気に揮発させたり、産業廃棄物を増やす事無く、未加硫ゴム部材組立工程に必要な未加硫ゴム同士の密着力を簡単に確保することができる、という効果がある。 As described above, according to the surface modification method for unvulcanized rubber of the present invention, the unvulcanized rubber member assembly process is not required without volatilizing the rubber volatile oil into the atmosphere or increasing industrial waste. There is an effect that adhesion between vulcanized rubbers can be easily secured.
また、第１のレーザー光、及び第２のレーザー光の波長を０．８〜０．９μｍとし、ゴム表面における第１のレーザー光、及び第２のレーザー光の単位面積当たりの照射密度を３〜４Ｗ／ｃｍ２、照射時間を０．２〜０．６ｓｅｃとすることで、未加硫ゴムの表面の改質を効率的に行うことができる。 Further, the wavelength of the first laser light and the second laser light is set to 0.8 to 0.9 μm , and the irradiation density per unit area of the first laser light and the second laser light on the rubber surface is 3 The surface of the unvulcanized rubber can be efficiently modified by ˜4 W / cm 2 and the irradiation time being 0.2 to 0.6 sec.
本発明の未加硫ゴムの表面改質方法に用いる装置構成を図面を用いて説明する。
図１の符合１０は、生タイヤを製造する際に用いる一般的な周知のタイヤ成形ドラムであり、タイヤ成形ドラム１０の矢印Ｌ方向側には、帯状の未加硫ゴム部材１２を搬送するコンベア１４が設けられている。生タイヤの製造に用いる未加硫ゴム部材１２としては、インナーライナー、トレッドゴム、サイドゴム、クッションゴム、カーカスプライ、ベルトプライ、ビードフィラー、各種補強層等を上げることができるが、これら以外のものであっても良い。
The apparatus configuration used in the surface modification method for unvulcanized rubber according to the present invention will be described with reference to the drawings.
Reference numeral 10 in FIG. 1 is a general well-known tire molding drum used when producing a raw tire, and a conveyor that conveys a belt-shaped unvulcanized rubber member 12 to the arrow L direction side of the tire molding drum 10. 14 is provided. As the unvulcanized rubber member 12 used in the production of the green tire, an inner liner, a tread rubber, a side rubber, a cushion rubber, a carcass ply, a belt ply, a bead filler, various reinforcing layers, and the like can be raised. It may be.
コンベア１４とタイヤ成形ドラム１０との間には、未加硫ゴム部材１２の搬送経路下側、及びタイヤ成形ドラム１０の上方には、各々レーザー照射装置１６が配置されている。
図２に示すように、レーザー照射装置１６は、ボックス１８の内部に、赤外線のレーザー光Ｌａを出射するレーザーダイオード２４、可視光のレーザー光Ｌｂを出射する照準用のレーザーダイオード２６、ミラー２８、レーザーダイオード２４、及びレーザーダイオード２６の制御を行う制御回路３０、レーザーダイオード２４から出射されたレーザー光Ｌａ、及びレーザーダイオード２６から出射されたレーザー光Ｌｂを線状にするレンズ系（例えば、柱状レンズ）３２等を備えている。なお、制御回路３０は、成形ドラム１０を回転させるモータも制御することができる。
レーザー光Ｌｂは可視光であれば良く、赤色、緑色、青色等、視認性がよければその色（波長）は特に問わない。
Between the conveyor 14 and the tire molding drum 10, a laser irradiation device 16 is disposed below the conveyance path of the unvulcanized rubber member 12 and above the tire molding drum 10.
As shown in FIG. 2, the laser irradiation device 16 includes a laser diode 24 that emits infrared laser light La, a laser diode 26 for aiming that emits visible laser light Lb, a mirror 28, and a box 18. The laser diode 24 and the control circuit 30 that controls the laser diode 26, the laser light La emitted from the laser diode 24, and the lens system that linearizes the laser light Lb emitted from the laser diode 26 (for example, a columnar lens) ) 32 etc. The control circuit 30 can also control a motor that rotates the molding drum 10.
The laser beam Lb may be visible light, and the color (wavelength) is not particularly limited as long as the visibility is good, such as red, green, and blue.
レーザーダイオード２４から出射されたレーザー光Ｌａは、レンズ系３２に向けて出射される。レーザーダイオード２４とレンズ系３２との間には、赤外線を通過し、可視光を反射するミラー２８がレーザー光Ｌａに対して斜めに配置されており、レーザーダイオード２４からミラー２８に向けて出射された可視光のレーザー光Ｌｂは、ミラー２８で反射され、ミラー２８を透過した赤外線のレーザー光Ｌａと同軸でレンズ系３２に向けて出射される。 The laser light La emitted from the laser diode 24 is emitted toward the lens system 32. Between the laser diode 24 and the lens system 32, a mirror 28 that transmits infrared rays and reflects visible light is disposed obliquely with respect to the laser light La, and is emitted from the laser diode 24 toward the mirror 28. The visible laser beam Lb is reflected by the mirror 28 and emitted toward the lens system 32 coaxially with the infrared laser beam La transmitted through the mirror 28.
赤外線のレーザー光Ｌａ及び可視光のレーザー光Ｌｂは、レンズ系３２に入射後、線状となって出射する。なお、照射位置における、レーザー光Ｌａ及びレーザー光Ｌｂの照射長さ、照射幅は、レーザー照射装置１６から照射位置までの距離、及びレンズ系３２によって決めることができる。赤外線のレーザー光Ｌａ及び可視光のレーザー光Ｌｂは同位置に照射される。 The infrared laser beam La and the visible laser beam Lb enter the lens system 32 and are then emitted in a linear shape. The irradiation length and irradiation width of the laser beam La and the laser beam Lb at the irradiation position can be determined by the distance from the laser irradiation device 16 to the irradiation position and the lens system 32. The infrared laser beam La and the visible laser beam Lb are irradiated to the same position.
（作用）
次に、レーザー照射装置１６を用いた未加硫ゴムの表面改質方法を説明する。
本実施形態では、タイヤ成形ドラム１０の外周に、帯状の未加硫ゴム部材１２を貼り付け、未加硫ゴム部材１２の端部同士を重ねてジョイントする例で説明する。
(Function)
Next, a method for modifying the surface of unvulcanized rubber using the laser irradiation device 16 will be described.
In the present embodiment, an example will be described in which a belt-like unvulcanized rubber member 12 is attached to the outer periphery of the tire molding drum 10 and the end portions of the unvulcanized rubber member 12 are overlapped and joined.
（１） 図１（Ａ）に示すように、コンベア１４から送り出された未加硫ゴム部材１２の先端（搬送方向側の端部）を、タイヤ成形ドラム１０の外周面に貼り付ける。
（２） レーザー照射装置１６からガイド用のレーザー光Ｌｂのみを出射し、レーザー光Ｌｂが未加硫ゴム部材１２の外面先端側に照射されるようにタイヤ成形ドラム１０を回転させ、初期位置とする。
(1) As shown in FIG. 1A, the tip of the unvulcanized rubber member 12 sent from the conveyor 14 (the end on the conveyance direction side) is attached to the outer peripheral surface of the tire molding drum 10.
(2) Only the guide laser beam Lb is emitted from the laser irradiation device 16, and the tire molding drum 10 is rotated so that the laser beam Lb is irradiated to the front end side of the unvulcanized rubber member 12. To do.
（３） 次に、赤外線のレーザー光Ｌａを出射すると共に、タイヤ成形ドラム１０を矢印Ａ方向へ回転させる。レーザー光Ｌａは、レーザー光Ｌｂと同位置に線状に照射される。そして、タイヤ成形ドラム１０を一定速度で回転（矢印Ａ方向）させることで、未加硫ゴム部材１２の上面先端側の一定範囲にレーザー光Ｌａが照射される。 (3) Next, the infrared laser beam La is emitted, and the tire molding drum 10 is rotated in the direction of arrow A. The laser beam La is irradiated linearly at the same position as the laser beam Lb. Then, by rotating the tire molding drum 10 at a constant speed (in the direction of arrow A), the laser beam La is irradiated to a certain range on the top end side of the upper surface of the unvulcanized rubber member 12.
赤外線のレーザー光Ｌａを未加硫ゴム部材１２の表面に照射することで、レーザー光Ｌａが照射された部分では、未加硫ゴム同士の密着力を阻害する表面の密着阻害物質（例えば、脂肪酸亜鉛、ワックス類等のブルーム）がエッチング（密着阻害物質が蒸発）により除去され、ゴム表面は未加硫ゴム本来の粘着性が得られる。 By irradiating the surface of the unvulcanized rubber member 12 with the infrared laser light La, the surface adhesion inhibitory substance (for example, fatty acid) that inhibits the adhesion between the unvulcanized rubbers in the portion irradiated with the laser light La. The bloom of zinc, waxes, etc.) is removed by etching (adhesion-inhibiting substances evaporate), and the rubber surface has the original stickiness of unvulcanized rubber.
本実施形態のレーザーダイオード２４は、波長０．８〜０．９μｍのレーザー光Ｌａを出射するものであるが、ブルーム等の密着阻害物質を除去乃至低減でき、必要とされる未加硫ゴム同士の密着力が得られれば、レーザー光Ｌａの波長は上記以外であっても良く、レーザー光Ｌａは赤外線に限らず、可視光線、紫外線等の他の波長の光線であっても良い。 The laser diode 24 of the present embodiment emits a laser beam La having a wavelength of 0.8 to 0.9 μm, but can remove or reduce adhesion-inhibiting substances such as bloom, and required unvulcanized rubbers If the adhesive force is obtained, the wavelength of the laser beam La may be other than the above, and the laser beam La is not limited to infrared rays but may be rays of other wavelengths such as visible rays and ultraviolet rays.
本実施形態では、制御回路３０は、未加硫ゴムの照射部位の単位面積当たりのレーザー光Ｌａの照射密度が３〜４Ｗ／ｃｍ２、照射時間が０．２〜０．６ｓｅｃの範囲内となるように、レーザーダイオード２４、及びタイヤ成形ドラム１０の回転を制御するが、ブルーム等の密着阻害物質を除去乃至低減でき、必要とする粘着性が得られれば、照射密度、及び照射時間等はこれら以外であっても良く、タイヤ成形ドラム１０の回転速度にも制限は無い。 In the present embodiment, the control circuit 30 is configured such that the irradiation density of the laser light La per unit area of the irradiated portion of the unvulcanized rubber is 3 to 4 W / cm 2 and the irradiation time is 0.2 to 0.6 sec. Thus, the rotation of the laser diode 24 and the tire molding drum 10 is controlled, but if the adhesion-inhibiting substances such as bloom can be removed or reduced and the necessary tackiness is obtained, the irradiation density, irradiation time, etc. Other than these, the rotational speed of the tire molding drum 10 is not limited.
なお、未加硫ゴム部材１２のレーザー光Ｌａを照射した部位の温度が高くなると、未加硫ゴム部材１２が加硫して粘着性が低下する虞があるので、未加硫ゴム部材１２が加硫しない様に、波長の選択、照射密度及び照射時間のコントロール、タイヤ成形ドラム１０の回転速度のコントロール等をする必要がある。 In addition, when the temperature of the site | part which irradiated the laser beam La of the unvulcanized rubber member 12 becomes high, since there exists a possibility that the unvulcanized rubber member 12 may vulcanize and adhesiveness may fall, unvulcanized rubber member 12 In order not to vulcanize, it is necessary to select the wavelength, control the irradiation density and irradiation time, control the rotation speed of the tire forming drum 10, and the like.
（４） 接合すべき領域のエッチングが終了した後、レーザー光Ｌａの出射を停止してタイヤ成形ドラム１０を約１周回転させるが、図１（Ｂ）に示すように、１周させる前に、未加硫ゴム部材１２の下面（未加硫ゴム部材１２の上面先端側のエッチングを行った部分に対して貼り合わされる予定の部位）に、下側のレーザー照射装置１６からレーザー光Ｌａを照射し、上面と同様にエッチングを行う。これによって、未加硫ゴム部材１２の下面においても、レーザー光Ｌａによってエッチングされた部分は、未加硫ゴム本来の粘着性が得られるようになる。 (4) After the etching of the regions to be joined is finished, the emission of the laser beam La is stopped and the tire molding drum 10 is rotated about one turn, but before making one turn as shown in FIG. The laser beam La from the lower laser irradiation device 16 is applied to the lower surface of the unvulcanized rubber member 12 (the portion to be bonded to the etched portion on the top end side of the upper surface of the unvulcanized rubber member 12). Irradiate and etch like the top surface. As a result, even on the lower surface of the unvulcanized rubber member 12, the original adhesiveness of the unvulcanized rubber can be obtained at the portion etched by the laser light La.
（５）その後、図１（Ｃ）に示すように、未加硫ゴム部材１２を図示しないカッターでカットし、端部同士が重なり合うようにエッチングを行った先端側の上面にエッチングを行った先端側の下面を押し付けて密着させる。未加硫ゴム本来の粘着性を有する部分同士を密着させるので、後の加硫工程まで、剥れや位置ずれ等の発生を防止することができる。
このように、本実施形態の未加硫ゴムの表面改質方法を用いることで、粘着性を得るために従来必要としていた、ゴムセメントの塗布や、表面をカットしてフレッシュ面を露出させる等の工程が必要無くなり、未加硫ゴム部材組立工程に必要な未加硫ゴム同士の密着力を簡単に確保することができる。
(5) After that, as shown in FIG. 1 (C), the unvulcanized rubber member 12 was cut with a cutter (not shown), and the top end on which the top end side was etched so that the ends overlap each other was etched. Press the lower surface of the side to make it adhere. Since the parts having the inherent tackiness of the unvulcanized rubber are brought into close contact with each other, it is possible to prevent the occurrence of peeling or misalignment until the subsequent vulcanization process.
Thus, by using the surface modification method for unvulcanized rubber of the present embodiment, conventionally required to obtain adhesiveness, application of rubber cement, cutting the surface and exposing the fresh surface, etc. This process is not necessary, and the adhesion between the unvulcanized rubbers required for the unvulcanized rubber member assembly process can be easily ensured.
［その他の実施形態］
上記実施形態では、生タイヤを構成する部材としての未加硫ゴム部材１２の表面を改質する説明をしたが、表面を改質する未加硫ゴム部材１２は生タイヤの構成部材に限らず、クローラー、コンベア用ベルト、動力伝達ベルト等、他のゴム製品の構成部材であっても良い。
[Other Embodiments]
In the above-described embodiment, the surface of the unvulcanized rubber member 12 as a member constituting the raw tire is modified. However, the unvulcanized rubber member 12 for modifying the surface is not limited to a component of the raw tire. It may be a constituent member of another rubber product such as a crawler, a conveyor belt, or a power transmission belt.
上記実施形態では、未加硫ゴム部材１２を重ね合わせてジョイントするために、未加硫ゴム部材１２の下面側と上面側の一部分にレーザー光Ｌａを照射して改質を行ったが、未加硫ゴム部材１２の端面同士を接合する場合には（所謂、突合せジョイント）、未加硫ゴム部材１２の端面にレーザー光Ｌａを照射して改質を行えば良い。 In the above embodiment, in order to overlap and joint the unvulcanized rubber member 12, the lower surface side and a part of the upper surface side of the unvulcanized rubber member 12 are irradiated with the laser beam La for modification. When joining the end faces of the vulcanized rubber member 12 (so-called butt joint), the end face of the unvulcanized rubber member 12 may be modified by irradiating with laser light La.
上記実施形態では、レーザーダイオード２４から出射されたレーザー光Ｌａをレンズ系３２で線状にして未加硫ゴム部材１２に照射したが、レーザー光Ｌａの照射方法はこれに限らず、例えば、レーザーダイオード２４から出射されたレーザー光Ｌａをポリゴンミラー、ガルバノミラー等を用いて線状に走査しても良く、レンズ系、矩形の孔の形成されたスリット等を用いて照射対象に対してレーザー光Ｌａが矩形状に照射されるように、レーザーダイオード２４から出射されたレーザー光Ｌａを整形しても良い。 In the above-described embodiment, the laser light La emitted from the laser diode 24 is linearized by the lens system 32 and irradiated to the unvulcanized rubber member 12. However, the irradiation method of the laser light La is not limited to this, for example, laser The laser beam La emitted from the diode 24 may be scanned linearly using a polygon mirror, a galvanometer mirror, or the like, and the laser beam is applied to the irradiation target using a lens system, a slit formed with a rectangular hole, or the like. The laser beam La emitted from the laser diode 24 may be shaped so that La is irradiated in a rectangular shape.
上記実施形態では、赤外線のレーザー光を出射する光源として、レーザーダイオード２４を用いたが、固体レーザー、炭酸ガスレーザー等の他の種類のレーザー光源を用いても良い。また、レーザー光源に限らず、赤外線ランプ、放電式ランプ等のレーザー光源以外の光源以外を用いても良い。レーザー光源以外の、例えばランプ等を用いる場合、特定の部位に赤外線を照射するために、湾曲したミラー、レンズ等を用いて赤外線を特定の部位に集光するようにしても良い。 In the above embodiment, the laser diode 24 is used as a light source that emits infrared laser light. However, other types of laser light sources such as a solid-state laser and a carbon dioxide gas laser may be used. In addition to the laser light source, a light source other than the laser light source such as an infrared lamp or a discharge lamp may be used. In the case of using a lamp or the like other than the laser light source, in order to irradiate the specific part with infrared rays, the infrared rays may be condensed onto the specific part using a curved mirror, lens or the like.
なお、未加硫ゴムの密着阻害物質の具体例としては、本実施形態では 例えば、脂肪酸亜鉛、ワックス類を上げたが、密着阻害物質としては、その他として、イオウ分の析出物等を上げることができる。なお、未加硫ゴムの密着を阻害するものであればこれら以外の物質であっても良い。 In this embodiment, for example, fatty acid zinc and wax are raised as specific examples of the unvulcanized rubber adhesion inhibiting substance, but as the adhesion inhibiting substance, other matters such as sulfur precipitates are raised. Can do. It should be noted that other substances may be used as long as they inhibit the adhesion of the unvulcanized rubber.
未加硫ゴムを放置すると、ゴム表面に密着阻害物質が徐々に析出してくる場合があるため、未加硫ゴムを接合する前、好ましくは、出来る限り接合する直前に表面の改質を行うことが好ましい。
上記実施形態では、密着阻害物質を除去するために電磁波として赤外線を用いたが、密着阻害物質を除去乃至低減できれば、紫外線、可視光線等の赤外線以外の電磁波を用いても良い。
If unvulcanized rubber is left as it is, adhesion-inhibiting substances may gradually precipitate on the rubber surface. Therefore, surface modification should be performed before joining unvulcanized rubber, preferably immediately before joining. It is preferable.
In the above embodiment, infrared rays are used as electromagnetic waves in order to remove the adhesion-inhibiting substances, but electromagnetic waves other than infrared rays such as ultraviolet rays and visible rays may be used as long as the adhesion-inhibiting substances can be removed or reduced.
（試験例）
本願発明の未加硫ゴムの表面改質方法の効果を確かめるために、表面の改質を行っていない未加硫ゴム同士の密力と、表面の改質を行った未加硫ゴム同士の密着力との比較を行った。
(Test example)
In order to confirm the effect of the surface modification method for the unvulcanized rubber of the present invention, the close force between the unvulcanized rubbers not subjected to the surface modification and between the unvulcanized rubbers subjected to the surface modification Comparison with adhesion was performed.
比較例１は、表面の改質を全く行っていない未加硫ゴムを用いており、実施例１〜４は、下記の表１内の条件で改質を行った未加硫ゴムを用いた。 Comparative Example 1 uses unvulcanized rubber that has not undergone surface modification, and Examples 1 to 4 use unvulcanized rubber that has been modified under the conditions in Table 1 below. .
密着力の試験方法は、株式会社東洋精機製作所製のＰＩＣＭＡ・タックテスタを用い、当該テスタのアルミロールの外周に未加硫ゴムを巻き付け、外周に巻き付けた未加硫ゴムに対して試験用の未加硫ゴムを５００ｇｆの荷重で３０秒押し当て、３０ｍ／ｍｉｎで引き上げ、その際の応力（未加硫ゴムの測定位置を変え、５点計測の平均値）を密着力（タッキネス：単位Ｎ）とした。
なお、評価は、部材製造１時間後の密着力を１００とする指数表示としており、数値が大きいほど密着力が高いことを表している。
The test method for adhesion is to use a PICMA / tack tester manufactured by Toyo Seiki Seisakusho Co., Ltd., unvulcanized rubber is wound around the outer periphery of the aluminum roll of the tester, and unvulcanized rubber wound around the outer periphery is not tested. Press the vulcanized rubber with a load of 500gf for 30 seconds and pull it up at 30m / min. It was.
In addition, evaluation is made into the index display which sets the contact | adhesion power after 1 hour of member manufacture to 100, and it represents that contact | adhesion power is so high that a numerical value is large.
加硫後の部材間の剥離力は、ＪＩＳ Ｋ６８５４に準拠して、Ｔ型剥離試験で測定した
（単位：Ｎ／２５ｍｍ）。
なお、評価は、比較例１の剥離力を１００とする指数表示としており、数値が大きいほど部材同士を剥離するに必要な力が大きい、即ち、部材同士の接合強度が高いことを表している。
The peeling force between the vulcanized members was measured by a T-type peeling test according to JIS K6854 (unit: N / 25 mm).
The evaluation is expressed as an index with the peeling force of Comparative Example 1 as 100, and the larger the value, the greater the force required to peel the members apart, that is, the higher the bonding strength between the members. .
なお、加硫後の部材間の剥離力に関して、指数９０で以上であれば問題ない。照射時間０．３０ｓｅｃを超えると、加硫後の部材間の剥離力が指数９０未満となり好ましくない。
Regarding the peeling force between the vulcanized members, there is no problem if the index is 90 or more. If the irradiation time exceeds 0.30 sec, the peeling force between the vulcanized members is less than 90, which is not preferable.
１２ 未加硫ゴム部材（未加硫ゴム）
１６ レーザー照射装置
２４ レーザーダイオード
Ｌａ レーザー光
12 Unvulcanized rubber member (unvulcanized rubber)
16 Laser irradiation device 24 Laser diode La Laser light
Claims (2)
前記表面、及び前記裏面に付着している未加硫ゴム同士の密着力を阻害する密着阻害物質を前記第１のレーザー光、及び前記第２のレーザー光の照射により除去して、未加硫ゴム同士の密着力を確保する様に前記表面と前記裏面を改質する、未加硫ゴムの表面改質方法。 Before the belt-like unvulcanized rubber is wound around a drum and the surface of one end in the longitudinal direction of the unvulcanized rubber and the back of the other end in the longitudinal direction are overlapped and joined to the surface of the unvulcanized rubber, Irradiating the first laser beam with the first laser irradiation device, irradiating the back surface of the unvulcanized rubber with the second laser beam with the second laser irradiation device,
An adhesion-inhibiting substance that inhibits the adhesion between the unvulcanized rubber adhering to the front surface and the back surface is removed by irradiation with the first laser light and the second laser light, and unvulcanized. A method for modifying the surface of an unvulcanized rubber, wherein the surface and the back surface are modified so as to ensure adhesion between rubbers.
前記表面、及び前記裏面において、前記第１のレーザー光、及び前記第２のレーザー光の照射密度が３〜４Ｗ／ｃｍ２、
前記第１のレーザー光、及び前記第２のレーザー光の照射時間が０．２〜０．６ｓｅｃの範囲内である、請求項１に記載の未加硫ゴムの表面改質方法。 The first laser light and the second laser light have a wavelength of 0.8 to 0.9 μm,
In the front surface and the back surface, the irradiation density of the first laser light and the second laser light is 3 to 4 W / cm 2 ,
The surface modification method for unvulcanized rubber according to claim 1, wherein the irradiation time of the first laser beam and the second laser beam is in the range of 0.2 to 0.6 sec.
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| JPS63147627A (en) * | 1986-12-11 | 1988-06-20 | Bridgestone Corp | Method for bonding edge face of rubber-like cylindrical member |
| JPH07508067A (en) * | 1992-05-19 | 1995-09-07 | マックスウェル・テクノロジーズ・インコーポレーテッド | How to increase the adhesion potential of surfaces using pulsed light energy |
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