JPH0957634A - Cleaning tape for liquid crystal panel and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning tape which has resilience and will never damage a work to be processed with residues. SOLUTION: A surface of a foaming base member 20 in which continuous bubble cells are formed is subjected to a buff process so that the cells 23 in the facial layer are exposed, and the underside is supported by a backing member 25, and a polishing layer 24 is formed at the surface where cells are exposed. Existence of bubble cells gives a resilience, and formation of the polishing layer along the bubble cells will increase the region of polishing layer, and the work to be processed will never be damaged because the residues from polishing intrude into the cells.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic cleaning tape for polishing a liquid crystal panel, and more particularly to an elastic cleaning tape having a continuous cell and a polishing layer on a member.

[0002]

2. Description of the Related Art Today, liquid crystals are used in various fields,
In particular, liquid crystal displays are used as displays for word processors, personal computers, televisions and the like. The liquid crystal panel that constitutes this liquid crystal display is manufactured by subjecting a glass substrate to various treatments, cutting the glass substrate, injecting liquid crystal between them, sealing, and further bonding a polarizing plate. In the manufacturing process of such a liquid crystal display, in particular, foreign substances such as glass chips (cullet) generated during cutting of the glass substrate, injection of the liquid crystal, and sealing, and residues of the resin used for sealing the liquid crystal Occurred, which was the main cause of defective products.

Conventionally, as shown in FIG. 6a, these foreign substances have been removed with a cutter knife. That is, the foreign matter was removed by moving the cutter knife while pressing the blade of the cutter knife against the liquid crystal panel at a constant angle.

Further, it has been manually removed using a solvent such as acetone or alcohol.

[0005]

With the cutter knife,
It may need to be replaced as the blade wears. At the time of replacement, it is necessary to adjust both of them in parallel so that the contact points between the panel and the blade of the cutter knife are uniform throughout.
The implementation is biased in either direction, as shown in FIG. 6b, and its parallel adjustment is difficult. Further, the wear of the cutter knife differs depending on the cutter knife, and it is difficult to distinguish when the blade is replaced. If the replacement is quick, the cutter knife which is still usable is wasted, and if the replacement is replaced late, the cleaning effect becomes poor. Further, the liquid crystal panel has a terminal portion for applying a voltage between the electrodes, but foreign matter scraped off by a cutter knife may contaminate the terminal portion.

Further, the cutter knife becomes larger as the size of the liquid crystal panel becomes larger, and it is difficult to handle and the safety becomes worse. Furthermore, the cutter knife cannot remove fats and oils, fingerprints and the like.

Further, the removal of foreign matter by hand deteriorates the productivity of the liquid crystal display and it is difficult to maintain its quality constant.

Therefore, an object of the present invention is to provide a cleaning tape which can clean a liquid crystal panel without using a cutter knife and a method for manufacturing the same.

Another object of the present invention is to provide an elastic cleaning tape which does not damage the liquid crystal panel by the removed foreign matter, and a method for manufacturing the same.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a cleaning tape, a backing member, and
A foamed base member having an open-cell structure formed by adhering it onto the backing member with an adhesive, wherein a part of the foam-cell structure is exposed from the surface thereof.
And a polishing layer formed on the surface of the base member where the bubble cells are exposed.

The foam base member is preferably polyurethane foam and the backing member is PET or P
VC is preferable, and the polishing layer is preferably composed of a mixture of an abrasive and a water-soluble polyurethane resin adhesive. Here, the abrasive is preferably fine particles of silicon oxide, alumina, carborundum, or diamond.

Further, in the method for producing a cleaning tape of the present invention, a step of buffing the surface of the foamed base member on which the open cell is formed to expose the cell near the surface, and the cell is exposed. A step of adhering a backing member to the back surface of the foam base member with an adhesive, and a step of applying a mixture of an abrasive and a water-soluble polyurethane resin adhesive to the surface where the bubble cells are exposed, and drying to form an abrasive layer. , Consists of.

[0013]

The cleaning tape thus formed has elasticity because the open-cells are formed therein.
Furthermore, when the cleaning tape is pressed, the polishing layer formed around the bubble cells is exposed on the surface. The degree of the exposure depends on the pressing force of the cleaning tape. Further, residues such as abrasive particles and shavings separated from the polishing layer by the cleaning operation with the cleaning tape enter the exposed bubble cells. The backing member prevents the tape from stretching during use.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The base member of the cleaning tape of the present invention is a polyurethane foam having open cells. The term "open cell" as used herein refers to a cell in which adjacent cells are in communication with each other. Besides polyurethane foam, PVC (polyvinyl chloride) foam or polyolefin foam may be used.

This polyurethane foam foam is produced by a conventional method, for example, by coating a polyurethane resin on a PET (polyethylene terephthalate) film as shown in FIG. 5, passing it through a gelling water tank, and then through a desolvation water tank. (The solvent dissolves and foams during this time), and the polyurethane foam sheet formed on PET is peeled from PET and dried. FIG. 3 shows the base member 20 thus formed. A film is formed on both surfaces 21 and 22 of the base member, and the bubble cells 23 are not exposed to the outside.

Hardness (that is, elasticity) of the base member 20
Is determined by the size and quantity of the bubble cell and the thickness of the member. Therefore, these factors are adjusted to determine hardness depending on the intended use of the cleaning tape. Generally, a hardness of 10 to 90 is used. It is preferable that the thickness is 0.1 to 1 mm and the density is 1 to 60 g / cm 2.

The base member of polyurethane foam is buffed with sandpaper or the like (shown by a broken line in FIG. 3) to expose the bubble cells 23 near the surface (see FIG. 2).

Next, an adhesive is applied to the surface of the base member 20 where the bubble cells are not exposed, and a backing member is attached (FIG. 2). As the backing member, PET (polyethylene terephthalate) or PVC (polyvinyl chloride) is suitable, and the thickness thereof is 6 μm to 100 μm.
μm is preferred. In particular, a thickness of 25 μm is desirable for PET and 100 μm for PVC. A water-soluble polyurethane resin adhesive is suitable as the adhesive.

Buffed base member with exposed bubble cells
A polishing layer 24 (FIG. 1) is formed on 20. The formation of the polishing layer is shown in FIG.

The base member 20 wound on a drum or the like is guided by the guide rollers 2 and 3 to the coating rollers 4, 5 and 6. Here, the mixture of the abrasive and the adhesive stored in the pad 7 is applied on the base member. Then, the organic solvent is removed by the drier 8 and wound on the bobbins 13 and 14 via the tension rollers 9, 10 and 11 and the guide roller 12.

As the abrasive, fine particles of silicon oxide, aluminum oxide, silicon carbide, zirconium oxide, chromium oxide, diamond, etc. are suitable.

The particle size of these abrasives is 0.3-40 microns, preferably 1-30 microns. Depending on the purpose of use of the cleaning tape, fine particles of the abrasive having an appropriate particle size are selected, but if the particle size is smaller than 0.3 micron, the polishing efficiency is deteriorated, and if it is larger than 40 micron, the glass material of the liquid crystal panel may be damaged. . This abrasive is preferably heated prior to mixing with the adhesive solution.

As the adhesive, a water-soluble polyester resin adhesive is suitable, and the diluted solution in which the adhesive is dissolved is preferably pure water. Solvents such as alcohol and ketones in pure water
% -10% is preferable because azeotropic distillation can be achieved. The viscosity of the mixture of the abrasive and the adhesive used here is 80 to 150 cp, and the coating speed is 5 to 16 m.
/ Min.

Base member 20 dried by the dryer 8.
Is cured at a temperature of 100 to 180 ° C for a time of 5 to 12 hours. The cleaning tape thus formed is shown in FIG. As can be seen from this figure, a polishing layer 24 containing an abrasive is formed along the bubble cells exposed from the surface of the backed base member.

When the liquid crystal panel is cleaned with the cleaning tape of the present invention, for example, the tape is wound around the supply roller, and while being wound by the take-up roller, the tape is pressed between the rollers by the pressing roller. Press on the panel for cleaning. At this time, tension is applied to the cleaning tape during pressing, but since the backing member is attached to the cleaning tape of the present invention, it does not substantially extend.

Further, in the cleaning operation, the polishing layer on the cleaning tape removes foreign matters on the liquid crystal panel, but since it has a further wiping effect, oils and fats, fingerprints, etc. can also be removed.

Further, by winding the cleaning tape around the supply roller and monitoring the remaining amount, the replacement time can be surely grasped.

The cleaning tape of the present invention has elasticity because it has bubble cells. As a result, when pressed against the liquid crystal panel, the foreign matter protruding from the surface of the liquid crystal bites into the cleaning tape, and a higher pressing pressure acts, so that the protruding portion can be scraped off. At this time, not only the polishing layer formed on the surface of the base member of the cleaning tape but also the polishing layer formed along the bubble cells contributes to the polishing. Therefore, even if the fine particles of the abrasive are peeled off by a cleaning operation or the like, by further pressing the cleaning tape, the abrasive layer formed along the bubble cells is exposed, and further polishing can be performed without replenishing the abrasive. Also, the usable life of the tape is extended. Further, the peeled abrasive particles, the residue such as shavings, etc. enter into the bubble cells, so that they do not damage the liquid crystal panel. Further, these residues can be removed together with the cleaning tape after the cleaning is completed.

[Brief description of drawings]

FIG. 1 shows a schematic cross-sectional view of a cleaning tape of the present invention.

FIG. 2 is a schematic cross-sectional view of a base member with a bubble cell exposed on the front surface and a backing member bonded on the back surface.

FIG. 3 shows a schematic cross-sectional view of a foamed base member before exposing a bubble cell from the surface.

FIG. 4 shows an apparatus for manufacturing a foam base member.

FIG. 5 shows an apparatus for forming a polishing layer on a base member.

FIG. 6a shows a state in which foreign matter on the liquid crystal panel is removed by a cutter knife, and FIG. 6b shows a state in which the cutter knife is adjusted in parallel on the liquid crystal panel.

[Explanation of symbols]

 20 member 23 bubble cell 24 polishing layer 25 backing member

Claims (6)

[Claims] 1. A backing member, and a foaming base member having an open-cell structure formed on the backing member with an adhesive, the foaming base member having a part of the foam-cell exposed from the surface thereof. And a polishing layer formed on a surface of the base member where the bubble cells are exposed. 2. The cleaning tape according to claim 1, wherein the foam base member is polyurethane foam. 3. The cleaning tape according to claim 1, wherein the backing member is PET or PVC, which prevents the tape from being stretched. 4. The cleaning tape according to claim 1, wherein the polishing layer is made of a mixture of an abrasive and a water-soluble polyurethane resin adhesive. 5. The cleaning tape according to claim 1, wherein the abrasive is silicon oxide, alumina, carborundum,
Alternatively, the cleaning tape is a fine particle of diamond. 6. A method of manufacturing a cleaning tape, which comprises applying a polishing agent to a foamed base member laminated on a backing member, wherein the surface of the foamed base member having open-cells is buffed, and the vicinity of the surface is buffed. The step of exposing the bubble cells, a step of attaching a backing member to the back surface of the foamed base member where the bubble cells are exposed with an adhesive, and an abrasive and a water-soluble polyurethane resin adhesive on the surface where the bubble cells are exposed. And a step of forming a polishing layer by drying the mixture.