JP2007231236A - Adhesive tape and adhesive tape wound on reel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive tape wound on a reel, causing neither coming into contact nor adhering the exposed adhesion surfaces of the adhesive tape side surfaces each other and normally drawing out the tape, even when the adhesive tape is wound to lap. <P>SOLUTION: Smooth drawing out of the tape is made possible by making winding angle θ lager than sin<SP>-1</SP>(w/(πd)) not to closely come into contact with adhesion surfaces of the exposed side surfaces of the film-like adhesive each other but to make spaces so that the adhesive surfaces are not adhered. The adhesive tape wound on a reel, causing no collapsed package form, is provided by making width of a release tape wider than the width of the film-like adhesive, even if, as the film-like adhesive, a narrowing one is applied. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a film-like adhesive, and relates to an adhesive tape and a reel-wound adhesive tape in which the adhesive tape is wound on a reel, and particularly to an adhesive tape in which the adhesive is made of an anisotropic conductive material.

In recent years, various film-like adhesives have been distributed. For example, film-like adhesives made of anisotropic conductive materials in which conductive particles are dispersed in an adhesive insulating resin are used for electronic devices such as liquid crystal panels. Widely used when mounting.
The anisotropic conductive material film adhesive is distributed on the market in the form of a reel-wound adhesive tape in which at least one surface is covered with a release film and wound in a tape form on a reel.
This adhesive tape is used for electrical connection and adhesion at the time of batch connection of electronic components and circuit boards when mounting electronic devices such as liquid crystal panels, or counter electrodes between circuit boards. Then, after feeding the adhesive tape from the reel and peeling off the release film, the film-like adhesive is inserted between the electrode surfaces to be connected and heated and pressurized.

In recent years, due to an increase in demand for liquid crystal panels and the like, the amount of adhesive tape made of anisotropic conductive material is increasing. In addition, the amount of adhesive tape used for one panel is increasing due to the increase in the screen size of the liquid crystal panel. Further, with the narrowing of the frame of the liquid crystal panel, the width of the anisotropic conductive material adhesive tape has been reduced.
Anisotropic conductive material adhesive tape is generally wound in the same concentric form on a reel and wound in layers. When winding, for example, it can be easily assembled according to the type of adhesive tape and has dimensional accuracy. A high take-up reel is proposed in Patent Document 1 below.
JP 2000-38258 A

In the winding method in which the reels are wound in the same concentric shape, the outer diameter becomes larger as the reels are continuously wound, and there is a problem that it is not possible to cope with the recent increase in the length of the adhesive tape due to restrictions on the outer diameter. Further, in the case of a tape having a narrow width in recent years, the tape collapses while being wound, and a defect in the manufacturing process becomes a problem.
In order to solve this problem, the inventors do not wind the adhesive tape around the reel in the same concentric form, but use a reel having a cylindrical body to make it closely adhere to the reel's body axis and wind it in multiple layers. I thought about stacking. According to this winding method, it is possible to make the length longer, and it does not wind in the same circle, so there is no need to consider the collapse of the tape due to narrowing, and the adhesive tape that has become increasingly long and narrow in recent years It is suitable for the winding method.
However, in this method, the adhesive exposed on the side surface of the adhesive tape becomes a problem. The adhesive tape is generally formed into a tape by simultaneously cutting a sheet-like film adhesive and at least one release film covering the surface of the film adhesive into a predetermined tape width. Because of such a production method, the adhesive is exposed on the cut side surface of the film-like adhesive after tape formation, and has adhesiveness.

When the adhesive tape having such a structure is laminated by being wound many times in the longitudinal direction of the reel according to the above-described method, a phenomenon occurs in which the tapes are bonded to each other by the side adhesive. In this state, when the adhesive tape is fed out from the reel, a phenomenon occurs in which the tapes cannot be smoothly fed out because the adhesive tapes are bonded to each other. Due to this phenomenon, the adhesive tape is not paid out by a predetermined amount in the bonding process when mounting a liquid crystal panel or the like, and a problem occurs that a defect occurs.
In the conventional winding method that does not consider lengthening and narrowing, the shape wound around the reel in the same circle is not affected by the adhesive on the side surface of the adhesive tape, and the adhesive tapes do not adhere to each other. Therefore, the above defects do not occur.
This defect is a new problem that arises when winding is performed by laminating many times in the longitudinal direction of the reel in order to cope with the lengthening and narrowing.

  The present invention has been made in view of such circumstances, and provides an adhesive tape and a reel-wrapped adhesive tape that can cope with the lengthening and narrowing of the adhesive tape and at the same time realize smooth feeding of the adhesive tape. With the goal.

In order to achieve the above object, a reel-wound adhesive tape according to the first invention comprises an adhesive tape having a width w composed of a film-like adhesive and a release film covering at least one surface thereof, and a reel of a cylindrical body having a diameter d. And the adhesive tape is wound around the cylindrical body of the reel at a winding angle θ larger than sin ⁻¹ (w / (πd)). Here, the winding angle θ is an angle formed by an imaginary line perpendicular to the axial direction of the cylindrical body of the reel and an adhesive tape wound around the cylindrical body.

When the adhesive tape is wound at a winding angle θ, it advances by π dtan θ in the axial direction of the reel when it makes one turn. And when (theta) is larger than sin < ^-1 > (w / ((pi) d)), a clearance gap generate | occur | produces between the side parts of an adhesive tape. Due to the gap between the side surfaces of the adhesive tape, the adhesive portions on the side surfaces having stickiness do not adhere to each other without being in contact with each other. It is not necessary to consider the collapse of the adhesive tape.

  Further, it is preferable that the adhesive tape is wound in a single layer around the cylindrical body of the reel. In single-layer winding, there is no adhesive tape laminated in multiple stages, so there is no need to consider the exposed adhesive on the side of the laminated adhesive tape. Thereby, it is sufficient to consider only a state in which a gap is formed between the side surfaces, and a structure in which the adhesive tapes are not securely bonded to each other is obtained. However, in this case, in order to cope with the increase in length, the reel axial direction must be extended to increase the reel width.

Therefore, normally, single-layer winding is preferable, but when mainly considering the length of the adhesive tape, it is preferable to use multilayer winding on the cylindrical body of the reel like the reel-wound adhesive tape according to the second invention. Good.
In the second invention, since the multi-layer winding is used, the reel width can be narrower than that of the single-layer winding. In addition, by setting the winding angle within the range of θ of the first invention, the laminated adhesive tape advances in the axial direction of the reel by w / cos θ or more when wound, and is not wound on the same circumference. There is no need to consider the collapse of the adhesive tape. That is, the adhesive tape wound by multilayer winding in the second invention has a gap without contacting the adhesive on the exposed side surface of the film-like adhesive, and the adhesive tape does not adhere to each other and is laminated. Since there is no need to consider the roll-off of the adhesive tape, it is possible to smoothly feed out the tape, and for the adhesive tape that increases the amount of use, a sufficient length is secured even if the reel width is narrower than the single-layer winding. It becomes possible.

An adhesive tape according to a third aspect of the present invention is an adhesive tape comprising a film-like adhesive and a release film that covers both sides thereof, and at least one width of the release film is the width of the film-like adhesive. It is characterized by being wider.
Since the width of the release film is wider than the width of the film-like adhesive, when the adhesive tape is wound, the wide release film hinders the adhesive on the exposed side of the film-like adhesive. The adhesive tapes do not adhere to each other without contacting the tape, and the tape can be smoothly fed out.

  The reel-wound adhesive tape according to the fourth aspect of the invention is characterized in that the adhesive tape of the third aspect of the invention is a multilayer winding around the cylindrical body of the reel. This makes it possible to ensure a sufficient length in the adhesive tape whose usage is increased.

  According to the first invention to the fourth invention, it is possible to provide an adhesive tape and a reel-wrapped adhesive tape that can cope with the lengthening and narrowing of the adhesive tape and at the same time realize a smooth feeding of the adhesive tape. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In this embodiment, the reel-wound adhesive tape and the adhesive tape are examples of an adhesive tape made of an anisotropic conductive material used for mounting a liquid crystal panel or the like. However, the present invention is not limited to this, and has adhesiveness. The present invention can be applied to any type of adhesive tape.

  The adhesive tape made of the anisotropic conductive material of this example is used for batch connection of the counter electrodes between the electronic components of the liquid crystal panel. The adhesive tape is fed out from the reel, and the release film is peeled off, and then the film is connected between the electrode surfaces to be connected. This is used when inserting and adhering between the electrodes by inserting and heating and pressing the adhesive.

  As the film adhesive, an anisotropic conductive adhesive is used in which conductive particles such as metal particles and metal plating resin particles are dispersed in an insulating resin such as an epoxy resin. Moreover, although the film of a silicon resin or PET resin is used for a peeling film, the resin kind is not limited to this. Furthermore, the release film is more preferable because it can be peeled off from the adhesive by performing a release treatment, and the handling workability when using the adhesive tape is improved.

FIG. 1A is a front view of a reel-wound adhesive tape in which an adhesive tape according to Embodiment 1 of the present invention is wound around a reel, and FIG. 1B is a right side view. Note that the film-like adhesive of the reel-wound adhesive tape according to the present embodiment has a width of 0.5 to 5 mm.
As shown in FIG. 1 (a), an adhesive tape 1 having a width w is wound at an angle θ around the body of a reel 2 having a cylindrical body having a diameter d. When the adhesive tape makes one round of the cylindrical body, it advances by πdtanθ in the axial direction, and when θ is larger than sin ⁻¹ (w / (πd)), it does not contact the side surface portion of the adhesive tape on the front periphery.

FIG. 2 is a schematic view showing a cross section of the adhesive tape. It consists of the film-form adhesive 3 and the peeling film 4 which covers the both surfaces, respectively. For example, the width of the film adhesive is 0.5 to 5 mm as described above, the thickness is 5 to 100 μm, and the thickness of the release film is 10 to 100 μm.
The adhesive tape is formed into a tape by simultaneously cutting a sheet-like film adhesive and at least one release film covering the surface of the film adhesive into a predetermined tape width. Because of such a manufacturing method, the adhesive is exposed on the cut side surface after tape formation, and has adhesiveness.

In FIG. 1A, θ is larger than sin ⁻¹ (w / (πd)), and a gap is formed between the adhesive tapes. As θ increases further, the gap between the adhesive tapes increases, but the amount of winding on the reel decreases. Considering the amount of winding and the aesthetics of the outer appearance at the time of shipment, it is desirable that the gap be smaller than the adhesive tape width w. Therefore, it is preferable to make the maximum value of θ smaller than sin ⁻¹ (2w / (πd)) so that the gap is smaller than the width w of the adhesive tape.

  In FIG. 1A, the adhesive tape is wound in a single layer. Although the amount of winding is smaller than that of multilayer winding, if the diameter of the cylindrical body of the reel is about 300 mm and the length is longer than about 250 mm, about 200 m can be secured with a 1 mm wide adhesive tape. This has a length sufficient for continuous connection of the counter electrodes of the liquid crystal panel. By using single-layer winding, there is no need to consider the laminated adhesive tape, and a gap between the adhesive tapes is surely opened, resulting in high reliability.

FIG. 3 is a front view of a reel-wound adhesive tape in which an adhesive tape according to Embodiment 2 of the present invention is wound around a reel. In this embodiment, the winding angle θ of the adhesive tape 1 is
sin ⁻¹ (w / (πd)) <θ <sin ⁻¹ (2w / (πd))
In this range, the reel 2 is wound in multiple layers.
When the winding angle θ is set as described above, there is a gap between the adhesive tapes, and the gap is smaller than w. At this time, even when the multi-layer winding is performed, the adhesive tape on the side of the adhesive tape on the front stage and the adhesive on the adhesive tape on the subsequent stage of the adhesive tape do not fall into the gap between the adhesive tapes on the front stage. The surfaces do not come into contact and adhere to each other. According to this winding method, even when a reel having a narrower width than that of a single layer winding is used, it is possible to cope with an increase in the length of the adhesive tape accompanying an increase in the amount of film-like adhesive used.

  FIG. 4 shows an adhesive tape comprising a film-like adhesive 3 and a release film 4 covering each of both surfaces thereof, and at least one width w ′ of the release film is wider than a width w of the film-like adhesive. It is a schematic diagram of the cross section of the adhesive tape.

  In this example, the material of the release film disposed on both surfaces of the film adhesive is the same for the PET film. However, the material may be changed for each release film covering both surfaces. Further, it is more preferable to perform a release treatment on the surface of the release film.

In FIG. 4, the width of the release film is wider than the width of the film adhesive. In the adhesive tape of this structure, regardless of the winding angle, even when it is wound in multiple layers, a wide release tape becomes a barrier on the side of the adhesive on the film sandwiched between the release tapes, so that the film adhesive The exposed adhesive surfaces on the side surfaces do not contact each other. As a result, when the adhesive tape is unwound from the reel, it can be smoothly unwound.
In this embodiment, the width of the release film is not more than twice the width of the film adhesive. This is because the aesthetics of the appearance shape at the time of shipment and the width of the reel when wound in multiple layers are taken into consideration, but the effect of the present invention can be obtained even if it is wider than twice.

FIG. 5 is a front view of a reel-wound adhesive tape in the case of multilayer winding on a reel using the adhesive tape of FIG. 4 according to Embodiment 3 of the present invention. When the winding angle θ is larger than sin ⁻¹ (w ′ / (πd)), a gap is formed between the adhesive tapes. However, since the side of the release film, which is wider than the film adhesive, covers the adhesive surface of the adhesive side as a wall-like barrier, the adhesive surface of the side of the film adhesive is bonded to the adhesive tape on the rear periphery Since it does not adhere to the agent, it is not necessary to make θ larger than sin ⁻¹ (w ′ / (πd)) and leave a gap in particular.

  FIG. 6 (a) shows the use of the adhesive tape of FIG. 4 according to Embodiment 4 of the present invention, aligning the side surface position of the release film on the wide side with the reel, and stacking multiple layers on the reel in the same circle. FIG. 6B is a right side view of the reel-wrapped adhesive tape when stacked in a stacked manner. Moreover, FIG.6 (c) is a schematic diagram of the cross section at the time of cutting in an AA cross section in the right view of FIG.6 (b). Due to the narrowing of the tape width of the adhesive tape, when the film-like adhesive and the release film are the same, if the main winding method is carried out, the occurrence of defective products due to collapse may be a problem, but the release film Since 4 is wider than the width of the film-like adhesive 3, even if it is wound in multiple layers in the same circle, no collapse occurs. In the case of the main winding method, it is not necessary to consider the winding angle θ, and the reel width may be only substantially wider than the peeling tape width w ′ on the wide side, so that the reel width is narrower than when winding at the winding angle θ. Is possible. Further, since the adhesive surfaces of the adhesive tape are not bonded to each other, it goes without saying that the adhesive tape can be smoothly drawn out.

  As described above, according to the present embodiment, it is possible to increase the length of the tape and to prevent the roll from collapsing, and it is possible to smoothly feed the tape when the tape is fed. Furthermore, in the case of an adhesive tape in which the width of the release film is wider than the width of the film-like adhesive, even if it is a film-like adhesive that is becoming narrower, the reel is thinned while achieving a thinner reel. This makes it possible to realize a reel-wrapping adhesive tape having a sufficient length even in the recent trend of increasing the amount of film-like adhesive used. Therefore, it is expected to be particularly effective when used for an anisotropic conductive material adhesive tape that is used when mounting liquid crystal panels whose usage is increasing in recent years and is used for batch connection between terminals.

(A) is a front view of the reel winding adhesive tape which concerns on Embodiment 1 of this invention, (b) is a right view. It is a schematic diagram of the cross section of the adhesive tape which concerns on implementation of this invention. It is a front view of the reel winding adhesive tape which concerns on Embodiment 2 of this invention. It is a schematic diagram of another cross section of the adhesive tape which concerns on implementation of this invention. It is a front view of the reel winding adhesive tape which concerns on Embodiment 3 of this invention. (A) is a front view of the reel winding adhesive tape concerning Embodiment 4 of this invention, (b) is a right view, (c) is a right side view of (b), and cut | disconnects by center AA cross section. It is a schematic diagram of the cross section of the part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adhesive tape 2 Reel 3 Film adhesive 4 Release film w Width of film adhesive d Diameter of reel body
θ Wrapping angle of adhesive tape on reel w 'Width of release film

Claims (4)

An adhesive tape having a width w composed of a film-like adhesive and a release film covering at least one surface thereof;
A cylindrical body reel having a diameter d,
A reel-wound adhesive tape, wherein the adhesive tape is wound around the cylindrical body of the reel at a winding angle θ greater than sin ⁻¹ (w / (πd)).   The reel-wound adhesive tape according to claim 1, wherein the adhesive tape is multi-layered around a cylindrical body of the reel. An adhesive tape comprising a film-like adhesive and a release film covering each of both surfaces thereof,
At least one width of the release film is wider than a width of the film adhesive.   A reel-wound adhesive tape, wherein the adhesive tape according to claim 3 is multi-layered on a reel body having a cylindrical body.

Images