JPH043123A - Roll brush for rubbing and production thereof - Google Patents

Abstract

PURPOSE:To produce the roll brush for rubbing having no seams on the surface at all with a simple stage by fitting a conductive cylindrical rubbing material onto a circular pipe and shrinking the rubbing material, thereby adhering this rubbing material to the circular pipe. CONSTITUTION:The roll brush for rubbing consists of a metallic pipe 1 made of an aluminum pipe, etc., to constitute a core material and the cylindrical rubbing material 2. This cylindrical rubbing material is formed to the diameter slightly larger than the diameter of the metallic pipe 1. The cylindrical rubbing material 2 is put on the metallic pipe and cold water or steam is sprayed to the rubbing material 2, by which the rubbing material 2 is shrunk. Consequently, the rubbing material 2 comes into close contact with the metallic pipe 1. The roll brush for rubbing having no seams at all of the surface of the substrate is obtd. by the simple process for production in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rubbing roll brush, particularly for rubbing the surface of an alignment film applied to a liquid crystal element substrate during the manufacture of liquid crystal elements. The present invention relates to a rubbing roll bran to be used and a method for producing the same.

[Prior art] When manufacturing a liquid crystal element, in order to align liquid crystal molecules in a certain direction, a polyimide alignment film is formed on the surface of a liquid crystal element substrate, and the surface is rubbed with a rubbing material. Rubbing process is in progress. In order to perform such a rubbing process, a rubbing roll brush shown in FIGS. 3 and 4 has been proposed.

The rubbing roll brush shown in FIG. 3 is made by wrapping a rectangular rubbing material 12 having the same width as the metal tube 11 around the surface of a metal tube 11 and bonding them together with an adhesive. Further, the rubbing roll brush shown in FIG. 4 is made by winding a band-shaped rubbing material 22 in a spiral shape around the surface of a metal tube 21 and bonding them together with an adhesive. As the rubbing material 12.22, a fabric made of a base fabric with rayon or nylon threads flocked to form a raised pile is used.

During the rubbing process, the surface of the alignment film can be subjected to the rubbing process by attaching these rubbing roll brushes to a predetermined rubbing machine and mechanically rotating the rubbing roll brushes.

[Problem to be solved by the invention] However, in the rubbing roll brush shown in Fig. 3,
Since the rectangular rubbing material 12 is wrapped around the surface of the metal tube 11, a seam 13 is formed in the longitudinal direction. Also,
In the rubbing roll brush shown in FIG. 4, since the belt-shaped rubbing material 22 is spirally wound around the surface of the metal tube 21, a spiral joint 23 is formed. At these joints 13.23, apply rubbing material 12.2.
A step will be created on the surface of 2.

Therefore, when such a rubbing roll brush is used to perform a rubbing process on an alignment film on a liquid crystal element substrate, the rubbing process may be uneven and the alignment of liquid crystal molecules may become non-uniform. In this case, there was a problem that the yield of manufactured liquid crystal elements was poor.

Furthermore, when manufacturing the above-mentioned conventional rubbing brush, the rubbing material 12.22 must be attached to the surface of the metal tube 11.21 so that no gap is formed at the joint 13.23. Therefore, there is confusion in the manufacturing process and there is a high possibility that defective products will be produced. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rubbing roll brush that can uniformly rub an alignment film on a liquid crystal element substrate and that is easy to manufacture, and a method for manufacturing the same.

[Means for Solving the Problems] The rubbing roll brush according to the present invention includes a conductive cylindrical rubbing material having a diameter larger than that of a circular tube serving as a core material, which is fitted into the circular tube, and the rubbing It is made by bonding the rubbing material to the circular pipe by shrinking the material.

The method for manufacturing a rubbing roll brush according to the present invention involves forming a cylindrical rubbing material with a larger diameter than a circular tube serving as a core material by cylindrical knitting, fitting the rubbing material into the circular tube, and subjecting it to a predetermined treatment. The rubbing material is bonded to the circular pipe by applying it and shrinking the rubbing material.

To remove ions such as Na"K"Cp-, the rubbing material is washed with ion-exchanged water. To remove the oil, the rubbing material is washed with a solvent.

[Function] Since the rubbing roll brush according to the present invention is made by shrinking the cylindrical rubbing material fitted into the circular tube, no seams are formed on the surface of the rubbing material. Therefore, when this rubbing roll brush is used, the alignment film on the liquid crystal element substrate can be uniformly rubbed.

Furthermore, since the rubbing material has conductivity, the electrodes of the liquid crystal element are not destroyed by static electricity during the rubbing process.

The manufacturing method according to the present invention forms a cylindrical rubbing material by knitting, thereby forming a rubbing material with no seams on the surface, and shrinking the rubbing material to form a cylindrical rubbing material. It is to be attached to. (7) Therefore, a roll blank for rubbing that has no seams on the surface can be manufactured in a simple process.

If the rubbing material is washed with ion-exchanged water, the Na''K + c p
ions, etc., are removed, and the adverse effects of these ions on the liquid crystal element can be prevented.

If the rubbing material is washed with a solvent, the oil adhering to the rubbing material during the manufacturing process will be removed, and the adverse effects of the oil applied to the liquid crystal element can be prevented.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining the method of manufacturing a rubbing roll brush according to the present invention, and FIG. 2 is a diagram showing its completed state.

This rubbing roll brush consists of a metal tube 1 such as an aluminum tube serving as a core material and a cylindrical rubbing material 2. First, the cylindrical rubbing material 2 is formed by cylindrical knitting. The cylindrical rubbing material 2 is made of a base fabric that has strong shrinkage properties due to moisture or heat and a conductive pile yarn knitted into a pile shape. This cylindrical rubbing material 2 is formed to have a slightly larger diameter than the metal tube 1. PVA (polyvinyl alcohol), strong rayon (rayon tire cord), etc. can be used as the fibers constituting the base fabric that shrinks with cold water or steam. Cellulose-based fibers such as rayon and cotton containing carbon black can be used as the conductive pile yarn. An artificial fiber such as nylon, polyester, or polyacrylonitrile impregnated with carbon black may also be used.

A cylindrical rubbing material 2 is placed over the metal tube 1. Next, the rubbing material 2 is contracted by spraying cold water or steam onto the rubbing material 2. As a result, the rubbing material 2 comes into close contact with the metal tube 1.

If fine grooves are formed in advance on the surface of the metal tube 1 using sand vapor or the like, the rubbing material 2 can be fixed to the surface of the metal tube 1 without using an adhesive. In addition, if a heat-melting adhesive is applied to the surface of the metal tube 1 in advance, the rubbing material 2 will be fixed to the metal tube 1 by melting when drying after the rubbing material 2 shrinks. Ru.

Next, the rubbing material 2 attached to the metal tube 1 is washed with ion-exchanged water. As a result, ions such as Na"K"C[- and oil agents that adhered to the rubbing material 2 during the tube knitting process are removed.

However, in order to remove the oil with ion-exchanged water, it is necessary to use an oil that can be easily removed with ion-exchanged water during the tube knitting process. Next, the rubbing material 2 is brushed by rotating the metal tube I while blowing steam onto the surface of the rubbing material 2. Furthermore, after drying the rubbing material 2, a shirring process is performed. This forms a standing pile.

In addition, in order to completely remove the oil agent that adheres during the raising and shirring processing, washing with ion-exchanged water and drying may be performed after the shirring processing. Cleaning with organic solvents such as chlorofluorocarbons, alcohol (isopropanol), and methylene chloride is also effective in removing oil.

The rubbing roll brush manufactured in this way is
The surface of the rubbing material 20 has no seams at all. Moreover, since the rubbing material 2 is subjected to the raising and shirring processing after being bonded to the metal tube 1, the uniformity of the surface of the rubbing material 2 is ensured. Therefore, when this rubbing brush is used to rub the alignment film on the liquid crystal element substrate, the surface of the alignment film can be rubbed uniformly, and the liquid crystal molecules can be aligned uniformly.

Further, since the rubbing roll brush of the above embodiment is composed of the metal tube 1 and the conductive rubbing material 2, the electrodes of the liquid crystal element will not be destroyed by static electricity during the rubbing process.

Furthermore, according to the above manufacturing method, stains such as ions and oil agents adhering to the rubbing material 2 are completely removed during the manufacturing process of the roll blank, so that these stains do not get mixed into the liquid crystal element during the rubbing process. Nor.

From the above, when the rubbing roll brush of the above embodiment is used, the yield of liquid crystal elements can be improved.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain a rubbing roll brush with no seams on the surface of the rubbing material through a simple manufacturing process. This allows uniform rubbing treatment to be applied to the alignment film of the liquid crystal element, making it possible to uniformly align liquid crystal molecules. Furthermore, since the rubbing material has conductivity, the electrodes connected to the liquid crystal element will not be destroyed by static electricity during the rubbing process. If the rubbing material is washed with ion-exchanged water or a solvent, dirt such as ions and oil will not be mixed into the liquid crystal element during the rubbing process.

Therefore, according to the present invention, the yield of liquid crystal elements can be improved.

2...Rubbing material

Claims (1)

[Claims] 1. A conductive cylindrical rubbing material having a diameter larger than that of the circular tube serving as the core material is fitted onto the circular tube, and the rubbing material is shrunk by shrinking the rubbing material. A rubbing roll brush made by adhering to the circular tube. 2. Form a conductive cylindrical rubbing material with a larger diameter than the circular tube serving as the core material by tubular knitting, fit the cylindrical rubbing material onto the circular tube, and perform a predetermined treatment to form the rubbing material. A method for producing a rubbing roll brush, which comprises bonding the rubbing material to the circular tube by shrinking the rubbing material. 3. The method for manufacturing a rubbing roll brush according to claim 2, wherein the rubbing material is washed with ion-exchanged water. 4. The method for manufacturing a rubbing roll brush according to claim 2, wherein the rubbing material is washed with a solvent.