JPH0434415A - Rubbing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rubbing apparatus for alignment films used in a liquid crystal panel manufacturing process.

Conventional drum-type rubbing method ζ A rubbing cloth is wound around the outer periphery of a continuously rotating drum, and the substrate coated with an alignment film is passed over the drum while being pressed against it to rub the alignment film. In addition, even if a rubbing cloth (made by flocking or weaving fibers such as nylon or rayon into the fabric) used for rubbing the alignment film is used, the rubbing cloth is wrapped around the drum of the rubbing device. Problems to be Solved by the Invention This method of fixing the rubbing cloth to the drum using a fixing device had the following problems: To align the liquid crystal uniformly The alignment coated on the surface of the substrate It is necessary to rub the membrane evenly with the rubbing cloth.For this purpose, it is necessary to wrap the rubbing cloth around the outer circumference of the drum without interruption.However, as shown in Figure 3, the rubbing cloth 2 is fixed to the drum 1. If the method of fixing with the fixing device 6 is used, at least the part of the width t that is affected by the rut of the fixing device 6 or the fixing of the fixing device 6 ζ
When the rubbing between the rubbing cloth and the alignment substrate is interrupted, if such a drum is rotated to rub the alignment film, the rubbing of the alignment film will be disturbed in the part that is synchronized with the rotation period of that part. 4. Also, how to fix the rubbing cloth to the drum using a fixing device.
The wrapping of the rubbing cloth loosens due to the expansion and contraction of the rubbing cloth itself and the resistance when pressing and rubbing the substrate against the rubbing cloth. This not only prevents the alignment film on the surface of the substrate from being rubbed uniformly, but also causes scratches on the alignment film.

The present invention is intended to solve such problems in the above-mentioned conventional example.

Means for Solving the ProblemsAnd the means for solving the above problems is to shrink the rubbing cloth that rubs the alignment film by heat treatment4.
Alternatively, after forming a ring using a material that shrinks in response to water or a solvent, it can be placed on the drum of a rubbing device. Depending on the amount of shrinkage of the rubbing cloth, set the dimensions so that the rubbing cloth will surely adhere to the outer periphery of the drum.

Further, it is preferable to provide irregularities such as streaked target-like grooves, criss-crossed target-like grooves, or an elastic body or an adhesive material on the outer periphery of the drum.

action The operation of the above means is as follows.

We used a material that shrinks when heat treated or reacts with water or solvents for the ring-shaped rubbing cloth, so after inserting the drum of the rubbing device into the fabric, the drum and fabric are shrunk by shrinking the material. It can be fixed tightly to the

Therefore, not only is there no need for a conventional fixing device for fixing the rubbing cloth, but the rubbing cloth becomes endless and can be placed in a variety of conditions on the drum, resulting in a variety of alignment films. This results in continuous rubbing.

In addition, by providing unevenness such as grooves in the shape of sushi targets or cross targets on the outer periphery of the drum, or by providing an elastic body or an adhesive material, when the rubbing cloth is contracted by any method and fixed to the drum of the rubbing device. It can be fixed securely.

With this, it is possible to prevent the rubbing cloth itself from expanding and contracting and from shifting due to resistance during rubbing. The parts are given the same number.

In Fig. 1, 1 is the drum of the rubbing device;
2 (Friend) It is a ring-shaped rubbing cloth.

The fabric 3 of the ring-shaped rubbing cloth 2 was subjected to heat treatment.In this example, a heat-shrinkable material that shrinks when heated was used. Then, fibers such as nylon and rayon 4 are added to the fabric 3.
To make a ring-shaped rubbing cloth, make the rubbing cloth into a ring shape, and then add fibers such as nylon palm yon to it by flocking or (tomo). The same effect can be obtained either by weaving or by weaving or weaving fibers such as nylon or rayon into the rubbing cloth, then cutting it to the specified size and connecting it into a ring shape.

Next, the outer diameter dimension of the drum 1 will be explained.

Compared to the outer diameter dimension d2C of the drum 1 & the inner dimension d1 of the ring-shaped rubbing cloth 2, the fabric 3 of the rubbing cloth 2
However, due to heat treatment, the amount of shrinkage that occurs in response to water or solvents, and the amount of shrinkage that occurs when wrapped around the outer periphery of the drum 1, are reduced.

In this embodiment, the outer diameter dimension d2 of the drum 1 is 0.5 mm smaller than the inner diameter dimension d1 of the rubbing cloth 2.

FIG. 2 shows another form of the drum 1.

The outer periphery of the drum 1 is provided with grooves 5 in the cylindrical direction in the form of streak targets.

This is to ensure more secure fixation when the rubbing cloth is inserted into the drum and then shrunk and fixed by heating, etc.

In this embodiment, the same effect can be obtained by providing unevenness of grooves on the outer periphery of the drum in the form of grooves in the form of streaks or by providing an elastic body or an adhesive material.

In the present invention, heat treatment is also used to form a rubbing cloth into a ring shape using a material that shrinks in response to water or solvent. Although the same effects as the present invention can be expected, as explained above, the present invention not only enables uniform rubbing processing, but also eliminates the need for fixing tools, etc.
Equipment can be simplified

[Brief explanation of the drawing]

Fig. 1 (Fig. 2 is a perspective view showing an embodiment of the present invention)
Figure 3: A perspective view showing another embodiment of the present invention.
FIG. 2 is a perspective view showing a conventional example. 1... To the drag 2... To the rubbing 3... To the fabric 4
... Oribe 5 ... 6 ... Fixed device Name of agent Patent attorney Shigetaka Awano 1 person
---V Ram Tatoo distortion t5 not yet

Claims (3)

[Claims] (1) A rubbing device characterized in that the rubbing cloth wound around the outer circumference of the drum is formed into a ring shape using a material that shrinks by heat treatment or shrinks in response to water or solvent. (2) The rubbing device according to claim 1, characterized in that unevenness is provided on the outer periphery of the drum around which the rubbing cloth is wound. (3) The rubbing device according to claim 1, wherein an elastic body or an adhesive material is provided on the outer periphery of the drum.