JPH06234961A - Production of pressure-sensitive adhesive tape - Google Patents
Production of pressure-sensitive adhesive tapeInfo
- Publication number
- JPH06234961A JPH06234961A JP5022297A JP2229793A JPH06234961A JP H06234961 A JPH06234961 A JP H06234961A JP 5022297 A JP5022297 A JP 5022297A JP 2229793 A JP2229793 A JP 2229793A JP H06234961 A JPH06234961 A JP H06234961A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- sensitive adhesive
- bubbles
- adhesive tape
- solution
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/101—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、粘着剤の層に気泡を
分散させた粘着テープの製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an adhesive tape having bubbles dispersed in an adhesive layer.
【０００２】[0002]
【従来の技術】粘着テープは、その被着体の表面状態に
より接着力が変化する。特に、その表面が微細な凹凸の
ある粗面であると、接着力は大きく低下する。例えば、
図３は一般の粘着テープを、表面に凹凸のある被着体に
貼着した状態を示す断面図で、９は基材、１０は粘着剤
層、１１は被着体であるが、この図でも判るとおり、被
着体１１の表面に凹凸があると、粘着剤層１０との間に
空間１２が生じ、粘着剤層１０と被着体１１との接触面
積が減少し、その結果、接着力が低下するのである。2. Description of the Related Art Adhesive strength of an adhesive tape changes depending on the surface condition of the adherend. In particular, if the surface is a rough surface having fine irregularities, the adhesive force is greatly reduced. For example,
FIG. 3 is a cross-sectional view showing a state in which a general pressure-sensitive adhesive tape is adhered to an adherend having irregularities on its surface. 9 is a base material, 10 is an adhesive layer, and 11 is an adherend. However, as can be seen, if the surface of the adherend 11 has irregularities, a space 12 is created between the adherend layer 10 and the adhesive layer 10, and the contact area between the pressure-sensitive adhesive layer 10 and the adherend 11 decreases, resulting in adhesion. The power is reduced.
【０００３】その対応策として、粘着剤層が被着体表面
の凹凸や粗面によく馴染むよう、基材にクッション性を
もたせたり、粘着剤層に気泡を分散させて弾力性を与え
るこは、よく知られていることである（特許庁公報「周
知慣用技術集（接着）」第２１６頁、昭和５９年６月１
５日発行）。As a countermeasure, it is necessary to give the substrate a cushioning property or disperse air bubbles in the adhesive layer to give elasticity so that the adhesive layer fits well to the irregularities and rough surfaces of the adherend. It is well known (Patent Office publication "Collection of Well-Known Conventional Techniques (Adhesion)", page 216, June 1, 1984.
Issued on the 5th).
【０００４】粘着剤層に気泡を分散させた粘着テープを
被着体に貼着した状態を図４に示す。１３は基材、１４
は粘着剤層、１５は表面に凹凸のある被着体、１６は粘
着剤層１４に分散している気泡である。この図に示す通
り、粘着テープを被着体１５に貼着した際、その圧力で
気泡１６を含む粘着剤層１４が変形し、被着体１５の凹
凸の中に入り込み、その間の空隙が少なくなり、従って
接着力が低下しないのである。FIG. 4 shows a state in which an adhesive tape having air bubbles dispersed in an adhesive layer is attached to an adherend. 13 is a base material, 14
Is an adhesive layer, 15 is an adherend having an uneven surface, and 16 is air bubbles dispersed in the adhesive layer 14. As shown in this figure, when the pressure-sensitive adhesive tape is attached to the adherend 15, the pressure causes the pressure-sensitive adhesive layer 14 containing the bubbles 16 to deform and enter the irregularities of the adherend 15, resulting in less voids therebetween. Therefore, the adhesive strength does not decrease.
【０００５】接着剤の層に気泡を分散させる方法として
は、 （１）粘着剤に予め発泡剤を混合しておくか、または発
泡性気体を溶解しておき、粘着剤塗工時、または加熱乾
燥時に発泡させる。 （２）粘着剤または粘着剤溶液に気体を吹き込んで、予
め気泡を分散させておき、それを基材の上に塗工する。 ことが行われている（特公昭６０−３３５０号公報）。As a method for dispersing air bubbles in the adhesive layer, (1) a pressure-sensitive adhesive is mixed with a foaming agent in advance, or a foaming gas is dissolved, and the pressure-sensitive adhesive is applied or heated. Allow to foam when dry. (2) A gas is blown into the pressure-sensitive adhesive or the pressure-sensitive adhesive solution to disperse air bubbles in advance, and the gas is applied onto the base material. (Japanese Patent Publication No. 60-3350).
【０００６】[0006]
【発明が解決しようとする課題】一般には上記（２）の
方法が安価であるため行われるが、時間の経過ととも
に、気泡の大きさにバラツキができ、気泡の分散状態に
も偏りが生じる欠点がある。従って、粘着剤溶液に気泡
を分散させる操作は、塗工機に近い輸送配管中で、使用
量に応じて必要な量だけ行うことが望ましい。Generally, the method (2) above is carried out because it is inexpensive, but the size of the bubbles varies with the passage of time, and the dispersed state of the bubbles becomes uneven. There is. Therefore, it is desirable that the operation of dispersing the bubbles in the pressure-sensitive adhesive solution is performed in a transportation pipe close to the coating machine in an amount required according to the amount used.
【０００７】特公昭６０−３３５０号公報では、ホット
メルト接着剤を対象とするもので、粘着剤溶液に関する
ものではないが、配管での輸送中に、気体を吹き込み、
ギアポンプで分散させる方法が提案されている。しか
し、この方法は設備的にも過大であり、粘着テープ製造
設備としては、より簡易なものが要求されていた。Japanese Patent Publication No. 60-3350 discloses a hot-melt adhesive, which is not related to a pressure-sensitive adhesive solution, but is blown with gas during transportation by piping.
A method of dispersing with a gear pump has been proposed. However, this method is too large in terms of equipment, and a simpler adhesive tape manufacturing equipment has been required.
【０００８】この発明は、上記の問題点に着目し、しか
も気体の吸入、分散を容易になしうる、粘着剤層に気泡
を含有する粘着テープを製造することを目的とするもの
である。The present invention has been made in view of the above problems, and an object of the present invention is to produce a pressure-sensitive adhesive tape containing bubbles in the pressure-sensitive adhesive layer, which can easily inhale and disperse gas.
【０００９】[0009]
【課題を解決するための手段】この発明は、上記の問題
を解決し、上記の目的を達成するためになされたもの
で、粘着剤溶液を貯槽から塗工機に供給し、基材に該粘
着剤溶液を塗布した後、加熱乾燥して粘着テープを製造
する工程において、粘着剤溶液を供給する手段としてギ
アポンプを使用し、そのギアポンプのエンドクリアラン
スを０．３mm〜０．８mmに設定したことを特徴とするも
のである。ここで、エンドクリアランスとはギアポンプ
のローターの側面とケーシングとの間隙をいう。The present invention has been made to solve the above problems and to achieve the above objects. An adhesive solution is supplied from a storage tank to a coating machine and is applied to a substrate. A gear pump is used as a means for supplying the pressure-sensitive adhesive solution in the step of manufacturing the pressure-sensitive adhesive tape by applying the pressure-sensitive adhesive solution and then heating and drying, and the end clearance of the gear pump is set to 0.3 mm to 0.8 mm. It is characterized by. Here, the end clearance means a gap between the side surface of the rotor of the gear pump and the casing.
【００１０】[0010]
【作用】この発明の粘着テープの製造方法においては、
貯槽の粘着剤溶液をギアポンプで塗工機に供給する際、
ギアポンプのケーシングとローターの側面との間に間隙
（エンドクリアランス）が設けてあるので、ローターが
回転し始めると、外の空気がローターの軸受およびエン
ドクリアランスを通って、ギアポンプの流入側に吸い込
まれる。吸い込まれた空気は気泡となって、粘着剤溶液
とともに、ローターのギアにより吐出側に運ばれる。そ
の際、二つのローターのギアの噛み込みにより、気泡は
細分化され、分散されて、吐出口から塗工機に供給され
るのである。In the method of manufacturing the adhesive tape of the present invention,
When supplying the adhesive solution from the storage tank to the coating machine with a gear pump,
Since there is a gap (end clearance) between the casing of the gear pump and the side surface of the rotor, when the rotor starts rotating, outside air is sucked into the inflow side of the gear pump through the bearing and end clearance of the rotor. . The sucked air becomes air bubbles and is carried to the discharge side by the gear of the rotor together with the adhesive solution. At that time, the air bubbles are subdivided and dispersed by the biting of the gears of the two rotors, and are supplied to the coating machine from the discharge port.
【００１１】なお、エンドクリアランスはあまりに小さ
過ぎると、空気の吸い込みが少なくなり、充分な気泡を
作ることができない。一方、この間隙が大きすぎると、
粘着剤溶液が吐出側から流入側に逆流し、吐出量を減少
させるおそれがある。If the end clearance is too small, the amount of air taken in will be small, and it will not be possible to create sufficient air bubbles. On the other hand, if this gap is too large,
The pressure-sensitive adhesive solution may flow back from the discharge side to the inflow side, and the discharge amount may be reduced.
【００１２】[0012]
【実施例】次に、この発明の粘着テープの製造方法につ
いて実施例により説明する。この実施例で使用した粘着
剤はアクリル樹脂系粘着剤で、酢酸エチルとトルエンの
混合溶剤に溶解し、常温における粘度は８，０００cps
〜１２，０００cpsに調整したものである。使用したギ
アポンプの縦断面図を図１に示し、そのＡ−Ａ断面図を
図２に示す。１は外側のローターを示し、２は内側のロ
ーターを示す。３はローター１の駆動軸、４はローター
２の軸、５はポンプ本体のケーシング、６は吐出口、７
は流入口、８はエンドクリアランスを示す。EXAMPLES Next, the method for producing the pressure-sensitive adhesive tape of the present invention will be described by way of examples. The adhesive used in this example was an acrylic resin adhesive, which was dissolved in a mixed solvent of ethyl acetate and toluene and had a viscosity at room temperature of 8,000 cps.
It is adjusted to ~ 12,000 cps. A longitudinal sectional view of the used gear pump is shown in FIG. 1, and its AA sectional view is shown in FIG. 1 indicates the outer rotor and 2 indicates the inner rotor. 3 is a drive shaft of the rotor 1, 4 is a shaft of the rotor 2, 5 is a casing of the pump body, 6 is a discharge port, 7
Is an inlet, and 8 is an end clearance.
【００１３】ポンプが稼働し始めると、駆動軸３により
ローター１が矢印方向に回転し、同時にローター２も回
転し、粘着剤溶液を流入口７から吸い込み、吐出口６へ
圧送する。その際、外気の一部がローター軸４とケ−シ
ング５の隙間およびエンドクリアランス８を通じて、流
入側に吸い込まれ、気泡を発生する。この気泡を含有し
た粘着剤溶液は、ローターのギアによって吐出側に搬送
されるが、ローターのギアの噛み込みにより圧縮され、
含有する気泡は細分化され、分散される。エンドクリア
ランス０. ５mmで、ローター１の回転数を毎分１１０回
転に設定したとき、吐出圧は約７kg／cm2であった。When the pump starts to operate, the drive shaft 3 rotates the rotor 1 in the direction of the arrow, and at the same time the rotor 2 also rotates, sucking the adhesive solution from the inflow port 7 and pumping it to the discharge port 6. At that time, a part of the outside air is sucked into the inflow side through the gap between the rotor shaft 4 and the casing 5 and the end clearance 8 to generate bubbles. The adhesive solution containing the bubbles is conveyed to the discharge side by the gear of the rotor, but is compressed by the biting of the gear of the rotor,
The contained bubbles are subdivided and dispersed. When the end clearance was 0.5 mm and the number of rotations of the rotor 1 was set to 110 rpm, the discharge pressure was about 7 kg / cm 2 .
【００１４】その結果、ロール塗工機により基材に塗布
した粘着剤溶液に含有する気泡の直径は５μ〜１５μ
で、これを加熱乾燥して得られた、粘着テープの粘着剤
層に生成した気泡の直径は２０μ〜７０μであった。As a result, the diameter of the bubbles contained in the pressure-sensitive adhesive solution applied to the substrate by the roll coater is 5 μm to 15 μm.
The diameter of bubbles formed in the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape obtained by heating and drying this was 20 μ to 70 μ.
【００１５】ローターの回転数を毎分９０〜１３０回転
に変化させた場合、吐出圧は４kg／cm2〜１０kg／cm2に
変化するが、結果に大きな変化は無かった。[0015] case of changing per minute 90-130 rotating the rotating speed of the rotor, although the discharge pressure is changed to 4kg / cm 2 ~10kg / cm 2 , significant changes in results were observed.
【００１６】[0016]
【発明の効果】以上説明したように、粘着剤層に気泡を
分散させた粘着テープを製造するには、従来は、貯槽に
おいて気泡を分散させていたので、比較的粘度の低い粘
着剤溶液を使用する場合、気泡の大きさのバラツキが大
きく、かつ不均一に分散していたが、本発明の製造法で
は、塗工機に供給する配管の中で気泡を発生させるた
め、気泡の大きさのバラツキが小さく、かつ均一に分散
した粘着剤溶液を、必要な時に、必要な量だけ、塗工機
に送入することができるようになった。As described above, in order to produce a pressure-sensitive adhesive tape in which bubbles are dispersed in the pressure-sensitive adhesive layer, conventionally, since the bubbles were dispersed in a storage tank, a pressure-sensitive adhesive solution having a relatively low viscosity was used. When used, there was a large variation in the size of the bubbles, and they were dispersed non-uniformly, but in the manufacturing method of the present invention, since the bubbles are generated in the pipe supplied to the coating machine, the size of the bubbles is It is now possible to feed the pressure-sensitive adhesive solution, which has a small variation and is uniformly dispersed, to the coating machine at the required time and in the required amount.
【００１７】また、設備的には、ギアポンプのエンドク
リアランスを一定の間隙に拡げるだけで、容易に目的を
達成することができるので、過大な投資が不要であるこ
とは、忘れてはならない効果である。Further, in terms of equipment, the purpose can be easily achieved only by expanding the end clearance of the gear pump to a certain gap, so that it is an undeniable effect that excessive investment is unnecessary. is there.
【図１】本発明の粘着テープの製造に使用するギアポン
プの一実施例を示す縦断面図である。FIG. 1 is a vertical cross-sectional view showing an embodiment of a gear pump used for manufacturing the adhesive tape of the present invention.
【図２】図１に示すギアポンプのＡ−Ａ断面図である。2 is a cross-sectional view taken along the line AA of the gear pump shown in FIG.
【図３】一般の粘着テープを、表面に凹凸のある被着体
に貼着した状態を説明するための断面図である。FIG. 3 is a cross-sectional view for explaining a state in which a general adhesive tape is attached to an adherend having an uneven surface.
【図４】粘着剤層に気泡を分散させた粘着テープを、表
面に凹凸のある被着体に貼着した状態を説明するための
断面図である。FIG. 4 is a cross-sectional view for explaining a state in which an adhesive tape having bubbles dispersed in an adhesive layer is attached to an adherend having an uneven surface.
１ 外側ローター ２ 内側ローター ３ 外側ローターの駆動軸 ４ 内側ローターの軸 ５ ポンプ本体のケーシング ６ 吐出口 ７ 流入口 ８ エンドクリアランス ９ 基材 １０ 粘着剤層 １１ 被着体 １２ 被着体と粘着剤層との間の空間 １３ 基材 １４ 粘着剤層 １５ 被着体 １６ 気泡 1 Outer rotor 2 Inner rotor 3 Outer rotor drive shaft 4 Inner rotor shaft 5 Pump body casing 6 Discharge port 7 Inflow port 8 End clearance 9 Base material 10 Adhesive layer 11 Adherend 12 Adhesive and adhesive layer Space between and 13 Base material 14 Adhesive layer 15 Adherent 16 Bubbles
Claims (1)
基材に該粘着剤溶液を塗布した後、加熱乾燥して粘着テ
ープを製造する工程において、粘着剤溶液を供給する手
段として、エンドクリアランスを０．３mm〜０．８mmに
設定したギアポンプを使用することを特徴とする粘着テ
ープの製造方法。1. An adhesive solution is supplied from a storage tank to a coating machine,
A gear pump having an end clearance set to 0.3 mm to 0.8 mm is used as a means for supplying the pressure-sensitive adhesive solution in a step of manufacturing the pressure-sensitive adhesive tape by applying the pressure-sensitive adhesive solution to a substrate and then heating and drying the pressure-sensitive adhesive tape. A method for producing an adhesive tape, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5022297A JPH06234961A (en) | 1993-02-10 | 1993-02-10 | Production of pressure-sensitive adhesive tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5022297A JPH06234961A (en) | 1993-02-10 | 1993-02-10 | Production of pressure-sensitive adhesive tape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06234961A true JPH06234961A (en) | 1994-08-23 |
Family
ID=12078814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5022297A Pending JPH06234961A (en) | 1993-02-10 | 1993-02-10 | Production of pressure-sensitive adhesive tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06234961A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2374854A1 (en) | 2010-03-11 | 2011-10-12 | Nitto Denko Corporation | Pressure-sensitive adhesive tape |
| EP2385088A1 (en) | 2010-03-11 | 2011-11-09 | Nitto Denko Corporation | Pressure-sensitive adhesive tape |
-
1993
- 1993-02-10 JP JP5022297A patent/JPH06234961A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2374854A1 (en) | 2010-03-11 | 2011-10-12 | Nitto Denko Corporation | Pressure-sensitive adhesive tape |
| EP2385088A1 (en) | 2010-03-11 | 2011-11-09 | Nitto Denko Corporation | Pressure-sensitive adhesive tape |
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