KR20150080285A - Rubbing Cloth Adhesive Tape and Rubbing Apparatus Having The Same - Google Patents

Abstract

Disclosed in the present invention is a rubbing cloth adhesive tape for fixing a rubbing cloth to a rubbing roll wherein the rubbing cloth performs a rubbing treatment of a liquid crystal display device. The rubbing cloth adhesive tape comprises: a tape substrate having conductivity and capable of being electrified; a first adhesive layer provided on one side of the tape substrate and having conductivity; and a second adhesive layer provided on the other side of the tape substrate and having conductivity. The rubbing cloth adhesive tape and the rubbing apparatus having the same according to the present invention is capable of improving quality and production yield of liquid crystal devices by effectively removing static electricity occurring from the rubbing process. In addition, the rubbing cloth adhesive tape of the present invention is easily removed from the rubbing roll. Accordingly, it is possible to prevent a rubbing cloth attachment defect due to residues or any other process defect in the rubbing process.

Description

[0001] The present invention relates to a rubbing cloth adhesive tape and a rubbing device having the rubbing cloth adhesive tape,

The present invention relates to a rubbing cloth adhesive tape for attaching a rubbing cloth used for manufacturing a liquid crystal display (LCD) to a rubbing roll and a rubbing apparatus having the rubbing cloth adhesive tape, To a rubbing cloth adhesive tape having conductivity so that static electricity generated in the rubbing cloth can be transferred to and removed from the rubbing roll, and a rubbing device having the rubbing cloth adhesive tape.

In the manufacturing process of the liquid crystal display device, a rubbing process for rubbing an orientation film of a polyimide material with cellulose fibers is performed to regulate the orientation of the liquid crystal molecules. In this way, , And the rubbing cloth has a structure of mostly a velvet fabric.

In general, the liquid crystal display device has various characteristics such as low voltage driving, low power consumption, full color implementation, light weight and small size, and is applied variously to an air monitor, a personal portable terminal, etc. from a clock, a calculator, a PC monitor, . The liquid crystal display device is largely divided into a liquid crystal display panel for displaying an image and a circuit portion for driving the liquid crystal display panel.

Here, the liquid crystal display panel has a TFT substrate on which a thin film transistor (TFT) array is formed and a color filter substrate on which a color filter array is formed (hereinafter referred to as a CF substrate) By injecting a liquid crystal therebetween. On the surface of the TFT substrate, a patterned ITO electrode is formed as a pixel electrode, and an alignment film is coated on the surface of the ITO electrode.

An ITO electrode is positioned as a common electrode on the surface of the CF substrate, and an alignment film is coated on the surface of the ITO electrode. The TFT substrate and the CF substrate are arranged so that the alignment films face each other, and the alignment films of both substrates are in contact with the liquid crystal.

On the other hand, the manufacturing process of the liquid crystal display device having the above-described structure includes an array process for forming switching elements such as a wiring pattern and a thin film transistor on a glass substrate (glass), an alignment process, A cell process for sealing the liquid crystal between opposing substrates, and a module process for attaching a driver IC or mounting a back light.

The cell process includes a rubbing process for inducing liquid crystal alignment, and a series of steps such as adhesion of a substrate, injection of a liquid crystal, and the like are performed. In the alignment process of the TFT substrate and the CF substrate, The process is carried out.

As described above, the rubbing method for rubbing the surface of the alignment film using a rubbing cloth is mainly used for the alignment treatment method as described above.

The rubbing cloth is adhered to the outer circumferential surface of a rubbing roll made of stainless steel and wound up. When rubbing the surface of the orientation film while rotating the rubbing roll, the surface of the orientation film is rubbed.

The rubbing cloth is produced by a brick process in the form of a pile of a pile fabric in a fabric (paper structure) generally made of warp and weft. By changing the thickness of the pile and the thickness of the pile used for the pile, And the length of the file is determined by the method of gesture on the fabric. Here, it is known that the fibers used as the pile are made of short fibers such as rayon and nylon and short fibers such as cotton.

In order to perform the above-described rubbing treatment, the rubbing cloth should be attached to the rubbing roll made of a cylinder. At this time, a rubbing cloth adhesive tape of the double-sided tape type is used.

Generally, the rubbing cloth adhesive tape has a structure in which an acrylic pressure sensitive adhesive is coated on both sides of a polyester substrate, and the pressure sensitive adhesive adhered to the surface of the rubbing roll should be cleanly removed without removing the pressure sensitive adhesive on the rubbing roll when the tape is removed after rubbing treatment .

On the other hand, a pressure-sensitive adhesive adhered to the rubbing cloth is required to have a rubbing treatment with a low smoothness so that more than 1,000 rubbing treatment should be performed on the raw material glass coated with the alignment film at a high speed of 1,000 RPM or more.

 In recent years, in order to increase the resolution of a liquid crystal display device, a pixel size has to be reduced, so that more electrodes are placed on a glass substrate having the same area. In addition, the density of the rubbing cloth is increased in order to exhibit a high resolution. The friction of the rubbing cloth in contact with the alignment layer is further increased, and the static electricity generated in the rubbing cloth in the rubbing process is also increased .

However, in the rubbing process, static electricity generated in the rubbing cloth can not be removed to the outside, but remains on the rubbing cloth. Therefore, the electrode of the liquid crystal display device is affected and causes a problem of driving failure.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a rubbing cloth which is capable of removing rubbing cloth, And a rubbing device having the rubbing cloth adhesive tape.

The present invention relates to a rubbing cloth adhesive tape for fixing a rubbing cloth for rubbing a liquid crystal display device to a rubbing roll, A first adhesive layer provided on one side of the tape substrate and having conductivity; And a second adhesive layer provided on the other side of the tape base material and having conductivity.

The conductive base material may include a conductive metal sheet or a conductive cloth sheet. The conductive base material has a thickness of 100 or less and a vertical resistance value of 0.1? / Inch ² or less.

The first adhesive layer and the second adhesive layer include a pressure-sensitive adhesive having adhesiveness and a conductive agent mixed with the pressure-sensitive adhesive. The first adhesive layer may have a weaker adhesive force than the second adhesive layer.

The first adhesive layer may include a removable adhesive, and the second adhesive layer may include a permanent adhesive.

In another aspect, the present invention provides a spinning machine comprising: a rubbing roll rotated by a driving device; A rubbing cloth wound around the rubbing roll to rub the alignment film of the liquid crystal display device; And a rubbing cloth adhesive tape for fixing the rubbing cloth to the rubbing roll, the rubbing cloth adhesive tape comprising: a rubbing cloth adhesive tape; A first adhesive layer provided on one side surface of the tape base material and adhering the tape base material to a surface of the rubbing roll and having conductivity, and a second adhesive layer provided on the other side of the tape base material, And a second adhesive layer having conductivity and attaching the base material to the surface of the rubbing cloth.

The rubbing pre-rubbing tape according to the present invention and the rubbing device having the rubbing pre-rubbing tape according to the present invention can effectively remove the static electricity generated in the rubbing process, thereby improving the quality and production yield of the liquid crystal display device.

Since the pre-rubbing adhesive tape according to the present invention is easily removed from the rubbing roll, it is possible to prevent defective adhesion of the rubbing cloth by the residue or a process failure in the rubbing process.

1 is a cross-sectional view showing the structure of a rubbing cloth adhesive tape according to an embodiment of the present invention.
2 is a structural view showing an example of a tape base material of a rubbing cloth adhesive tape according to an embodiment of the present invention.
3 is an exploded view of a rubbing device according to one embodiment of the present invention.
4 is a view showing a resistance measuring apparatus.

Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same reference numerals and symbols are used for the same components, and additional description and overlapping description thereof will be omitted in the following.

A rubbing cloth adhesive tape according to an embodiment of the present invention is a tape or double-sided tape for fixing a rubbing cloth for rubbing a liquid crystal display device to a rubbing roll, and is provided with a conductive tape base which can be energized, And a second adhesive layer provided on the other side of the tape base and having conductivity, the first adhesive layer having conductivity and the second adhesive layer having conductivity.

The conductive base material may include a conductive metal sheet or a conductive cloth sheet. The conductive base material has a thickness of 100 or less and a vertical resistance value of 0.1? / Inch ² or less.

The first adhesive layer and the second adhesive layer include a pressure-sensitive adhesive having adhesiveness and a conductive agent mixed with the pressure-sensitive adhesive. The first adhesive layer may have a weaker adhesive force than the second adhesive layer.

The first adhesive layer may include a removable adhesive, and the second adhesive layer may include a permanent adhesive.

Next, a rubbing device according to another embodiment of the present invention includes a rubbing roll rotated by a driving device such as a motor, a rubbing cloth wound around the rubbing roll to rub the alignment film of the liquid crystal display device, And the aforementioned rubbing cloth adhesive tape fixed to the rubbing roll.

Embodiments of the present invention will be described in more detail with reference to FIGS. 1 to 4. FIG.

The rubbing cloth adhesive tape disclosed in this embodiment is a double-sided tape, and the rubbing cloth is attached to and fixed to a rubbing roll made of a rubbing roll, for example, SUS, which is a cylindrical rotating body.

1, the rubbing cloth adhesive tape comprises a base material 10 having conductivity, that is, a tape base material 10, a first adhesive layer 20a provided on one side of the tape base material 10, And a second adhesive layer 20b provided on the other side (opposite side of the first adhesive layer) of the first adhesive layer 10. The first adhesive layer 20a and the second adhesive layer 20b are covered and protected by the protective film layers 30a and 30b and used after removing the protective film layers 30a and 30b, And the rubbing roll.

As described in this embodiment, the adhesive strength between the first adhesive layer 20a and the second adhesive layer 20b may be different from each other. In other words, one of the first adhesive layer 20a and the second adhesive layer 20b has a weaker adhesion than the other. In this embodiment, an example in which a weak adhesive force is attached to the rubbing roll is disclosed do.

For example, as in the present embodiment, the adhesive force of the first adhesive layer 20a is set to be weaker than that of the second adhesive layer 20b, so that the surface coated with the first adhesive layer 10a The surface of the rubbing cloth on which the second adhesive layer 10b is coated is attached to the paper tissue of the rubbing cloth.

The first adhesive layer 20a has a removable sticky conductive adhesive which can be removed completely after the rubbing cloth adhesive tape is attached to the rubbing roll and the second adhesive layer 20b And a conductive pressure-sensitive adhesive having a high adhesive force capable of permanent adhesion with the rubbing cloth. Here, the concept of removable and permanent sticking, and the manufacturing method itself are generally known in the art, so that further explanation is omitted.

The tape base 10 is made of a conductive base material, that is, a sheet that can be energized, rather than a polyester film used for a conventional double-faced adhesive tape. More specifically, the tape base 10 may be formed of a metal plate made of a conductive metal such as aluminum (Al), copper (Cu), gold (Au), or silver (Ag) Or may be constituted by a sheet of a conductive cloth on which any one of a fabric, a knit (knitted fabric) and a nonwoven fabric is plated or subjected to a post-treatment such as a conductive material coating.

The thickness of the tape base material 10 is preferably 100 μm or less, particularly preferably 10 μm to 100 μm, but is not limited thereto. When the thickness of the tape base material 10 is less than 10 탆, the surface stability of the tape material 10 due to heat during coating of the pressure-sensitive adhesive material on the surface of the tape base material 10 is degraded. When the thickness exceeds 100 탆, The bubbles are easily generated and the adhesion is deteriorated. The tape substrate has a vertical resistance value of 0.1? / Inch ² or less, but is not limited thereto.

The first adhesive layer 20a and the second adhesive layer 20b use a conductive adhesive agent which is not a general acrylic adhesive agent. Such a conductive pressure-sensitive adhesive may be prepared by adding a conductor (a conductive agent or a conductive material) such as aluminum (Al), copper (Cu), gold (Au), silver (Ag), or nickel (Ni) to a rubber, acrylic, And can be used in combination.

In the case of the first adhesive layer 20a, a removable pressure sensitive adhesive is used which is attached to a rubbing roll and can be completely removed after rubbing, as described above. In the case of the first adhesive layer, high conductivity is required so that the friction static electricity can be discharged (discharged) to the outside through the rubbing roll. Therefore, it is preferable that the first adhesive layer has an adhesive strength of 250 gf / 25 mm (KS A 1107, 180 ° Peel Test Method) or more and a vertical resistance value (MIL-G-83528 standard) of 0.1 Ω / inch ² or less. Generally speaking, it is a 100% insulator if it ^is more than 10 ⁹ Ω (= 80 Ω / inch ²⁾ .

As the second adhesive layer 10b, a permanent adhesive of a permanent property is used, which is required to have a high adhesive force so as to prevent the rubbing cloth from falling off due to high-speed rotation and friction, and which can be permanently attached. Therefore, the second adhesive layer (10b) has the first adhesive layer (10a) the adhesive strength than twice as especially 500gf / 25mm (KS A 1107, 180 ° Peel Test Method) or more cohesive and 40Ω / inch ^2, the vertical resistance of less than (MIL-G-83528). In order to increase the adhesive strength of the second adhesive layer, the amount of the adhesive is larger than that of the first adhesive layer, and the amount of the conductive agent such as nickel powder is relatively reduced.

In general, when the resistance value is 10 ⁹ Ω (= 80 Ω / inch ²⁾ or more, it is referred to as a 100% insulator. The lower limit of the adhesive strength upper limit and the vertical resistance value of the second adhesive layer, The adhesive strength can be readily determined by those skilled in the art to such an extent that permanent adhesion is possible, and the same can be said of the first adhesive layer.

In the case of the rubbing cloth adhesive tape and the rubbing apparatus described in this embodiment, it is possible to effectively remove the static electricity generated in the rubbing process to the outside, thereby effectively improving the defective electrode caused by the friction static electricity, It is possible to effectively cope with foreign matter adhesion.

Hereinafter, the present invention will be described in more detail with reference to specific examples and comparative examples. However, the present invention is not limited to the following examples.

[Example 1]

(Ni) -copper (Cu) -nickel (Ni) to a polyester fabric fabric sheet (weight 75g / m 2, thickness 70 탆) made of plain fabric using a polyester polyester 75de / A tape base material having a vertical resistance value of 0.1? / Inch ² is prepared by plating over the car.

On one side of the sheet substrate, an electrically conductive pressure sensitive adhesive containing a nickel (Ni) conductor as a filler and an acrylic pressure sensitive adhesive of a remover property was applied to the acrylic pressure-sensitive adhesive having a thickness of 25 탆 and a pressure- ) Conducting the coating with a thickness of 35 탆 by using a conductive adhesive compounded with a conductive filler.

The first adhesive layer of the rubbing roll attachment surface had an adhesive strength of 250 gf / 25 mm (KS A 1107, 180 ° Peel Test Method) and a vertical resistance value (MIL-G-83528) of 0.1 Ω / inch ² , (MIL-G-83528) having an adhesive strength of 500 gf / 25 mm (KS A 1107, 180 ° Peel Test Method) and a 40 Ω / inch ² vertical resistance value.

A rubbing cloth (HY-5318, manufactured by Hyperplex Co., Ltd., Korea) was attached to a rubbing roll having a diameter of 140 占 using the rubbing cloth adhesive tape of this embodiment, and left under constant temperature and humidity conditions for 24 hours.

An IPS mode standard glass in which a polyimide alignment film SE-6514 manufactured by Nissan Chemical Co., Ltd. was coated to a thickness of 800 Å was placed on a rubbing machine (rubbing apparatus) for testing, with a rubbing interval of 0.35 mm, a stage moving speed of 25 mm / min, The rubbing was repeatedly carried out for 10 hours under the rubbing condition of the rotating speed of 1,200 rpm, and the static electricity of the rubbing cloth was measured by using an infrared electrostatic measuring device.

[Comparative Example 1]

A polyester film having a thickness of 50 占 퐉 was used as the tape base material. An acrylic pressure-sensitive adhesive of a remover property was applied to one side of the tape base and an acrylic pressure-sensitive adhesive of permanent adhesion property was applied to the other side thereof to a thickness of 35 占 퐉 .

The pressure-sensitive adhesive layer of the rubbing roll-attached surface had an adhesive strength of 250 gf / 25 mm (KS A 1107, 180 ° Peel Test Method), and the adhesive layer of the rubbing cloth adhered surface had a pressure of 500 gf / The adhesive force is obtained.

A rubbing cloth (HY-5318, manufactured by Hyperplex Co., Ltd., Korea) was attached to a rubbing roll having a diameter of 140 탆 by using a rubbing cloth adhesive tape of the comparative example, and left under constant temperature and humidity conditions for 24 hours.

An IPS mode standard glass coated with a thickness of 800 Å on a polyimide alignment film SE-6514, manufactured by Nissan Chemical Co., Ltd., for a test rubbing machine was rubbed under a rubbing condition of a rubbing interval of 0.35 mm, a stage moving speed of 25 mm / min and a rubbing roll rotating speed of 1,200 rpm The rubbing was repeated for 10 hours, and the electrostatic charge of the rubbing cloth was measured using an infrared electrostatic meter.

The electrostatic measurement values according to the rubbing time in the above Examples and Comparative Examples are shown in Table 1.

Rubbing time (hr) Static electricity (kV) Comparative Example 1 Example 1 0 0 0 2 0.5 0.1 4 0.8 0.2 6 1.5 0.3 8 2.0 0.5 10 4.0 1.0

As shown in Table 1, it can be seen that the static electricity remaining on the rubbing cloth adhered to the rubbing roll is greatly reduced by the specific embodiment of the present invention.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them.

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

10: tape substrate 20a: first adhesive layer
20b: second adhesive layer 30a, 30b: protective film layer

Claims (8)

A rubbing cloth adhesive tape for fixing a rubbing cloth for rubbing a liquid crystal display device to a rubbing roll:
An electrically conductive tape substrate capable of being energized;
A first adhesive layer provided on one side of the tape substrate and having conductivity; And
And a second adhesive layer provided on the other side surface of the tape base material and having conductivity. The method according to claim 1,
Wherein the conductive base material comprises a conductive metal sheet or a conductive cloth sheet. The method according to claim 1,
Wherein the conductive base material has a thickness of 100 or less and a vertical resistance value of 0.1? / Inch ² or less. The method according to claim 1,
Wherein the first adhesive layer and the second adhesive layer comprise a pressure-sensitive adhesive and a conductive agent mixed with the pressure-sensitive adhesive. The method according to claim 1,
Wherein the first adhesive layer has a weaker adhesive force than the second adhesive layer. The method according to claim 1,
Wherein the first adhesive layer comprises a removable adhesive, and the second adhesive layer comprises a permanent adhesive. A rubbing roll rotated by a driving device;
A rubbing cloth wound around the rubbing roll to rub the alignment film of the liquid crystal display device; And
And a rubbing cloth adhesive tape for fixing the rubbing cloth to the rubbing roll,
Wherein the rubbing cloth adhesive tape comprises:
A conductive tape substrate capable of being energized,
A first adhesive layer provided on one side of the tape base material and attaching the tape base material to the surface of the rubbing roll and having conductivity,
And a second adhesive layer provided on the other side surface of the tape base material and attaching the tape base material to the surface of the rubbing cloth and having conductivity. The method according to claim 1,
Wherein the first adhesive layer comprises a removable adhesive, and the second adhesive layer comprises a permanent adhesive.

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