JP5322909B2 - Rubbing treatment method, optical compensation film manufacturing method - Google Patents

Description

  The present invention mainly relates to a rubbing treatment method and a rubbing treatment apparatus, and more particularly to a method for removing dust generated when rubbing an alignment film in an optical compensation film manufacturing process and a method for adjusting a rubbing cloth.

  As a method for improving the viewing angle of a TN-LCD widely used in a liquid crystal display device, an optical compensation film in which a liquid crystalline discotic compound layer is formed on an alignment film of a transparent film is known. The alignment film at that time is obtained by forming an alignment film forming material layer on a transparent film and rubbing the alignment film forming material layer.

  In the rubbing process, a rubbing roller in which a rubbing cloth (rubbing sheet) is bonded to the circumferential surface of the cylindrical axis of the rubbing roller is rotated in a direction opposite to the running direction of the alignment film forming material layer, and the rubbing cloth and the alignment film forming material layer This is done by physically rubbing. Therefore, in the rubbing process, dust is easily generated because the rubbing roller and the alignment film forming material layer rub against each other. When the dust adheres to the transparent film, it becomes a bright spot defect of the optical compensation film, and the display quality of the liquid crystal display device There was a risk of lowering.

  Moreover, the direction of the hair feet (pile) of the rubbing cloth varies, and the rubbing fabric may be fixed with the directions of the hair feet being uneven. When a rubbing roller having a non-uniform direction of hair is used in this way, the alignment direction of the alignment film subjected to the rubbing treatment becomes non-uniform, resulting in a decrease in performance of the liquid crystal display device. Furthermore, if the direction of the hairs is different, the fine pieces are not easily removed by cleaning but remain, and this adheres to the alignment film, resulting in a bright spot defect.

  Therefore, as an adjustment method for aligning the directions of the hair feet of the rubbing roll, for example, in Patent Document 1 below, the hair feet of the rubbing cloth of the rubbing roll are brought into contact with the metal surface of the roll having a metal surface, thereby moving the hair feet. A rubbing roll adjusting method is described which is characterized by aligning.

  Further, as a method for removing dust generated by rubbing treatment, for example, in Patent Document 2, after removing the surface of a transparent film after rubbing treatment with a static eliminator, dust is removed using a surface dust remover or an adhesive roller. It is described to do. Patent Document 3 discloses that the surface of a transparent film is neutralized by irradiating ionizing radiation (soft X-rays having a wavelength of 0.1 to 0.5 nm) having high penetrating power from the non-rubbed surface side, and is generated by rubbing treatment. A method for removing dust is described. Furthermore, Patent Document 4 describes a method of removing dust on the surface of the alignment film by performing wet dust removal on the alignment film formed by rubbing using a wet dust remover.

JP 2005-292430 A JP-A-9-73081 Japanese Patent Laid-Open No. 11-305233 JP 2002-40245 A

  However, the rubbing roll adjustment method described in Patent Document 1 is performed before rubbing and after cleaning the rubbing cloth, and is performed off-line. Therefore, it takes time to replace the rubbing roller by off-line adjustment, which is not efficient in the production of the optical compensation film.

  In recent years, the bright spot size that affects the deterioration of the display quality of the liquid crystal display device has become smaller due to the higher brightness and higher definition of the liquid crystal display device. For this reason, there is a demand for removal (dust removal) of fine dust that causes bright spots.

  However, in the methods described in Patent Documents 2 to 4, dust removal of the rubbing cloth is performed without contact with the yarn of the rubbing cloth, and the dust is not sufficiently removed. Further, when dust was removed by contact with a rubbing cloth, the directionality of the wool yarn was nonuniform, and the directionality of the alignment film of the alignment layer was nonuniform.

  The present invention has been made in view of such circumstances, and a rubbing method and a rubbing method that can improve productivity by efficiently removing dust generated in the rubbing process and extending the life of the rubbing roller. It is an object of the present invention to provide a processing apparatus, a method for manufacturing an optical compensation film, and an apparatus therefor.

In order to achieve the above object, the present invention attaches a rubbing roller to the surface of the alignment film forming material layer while moving the long flexible film provided with the alignment film forming material layer in the longitudinal direction. An alignment film forming step of contacting the rubbing cloth in a rotating state to form an alignment film; and after the rubbing cloth comes into contact with the long flexible film, a roll brush is brought into contact with the surface of the rubbing cloth. Te, wherein possess a rubbing cloth dust removing was dust adhering to the rubbing cloth, and dust evacuation step of evacuating remove dust removed by the rubbing cloth dust step, the roll-like brushes are ultrasonic vibrations providing a rubbing treatment wherein the imperial Rukoto.

  According to the present invention, after the alignment film is formed by being brought into contact with the rubbing cloth, the surface of the rubbing cloth is brought into contact with the roll brush that is vibrated to the left and right to remove the dust adhering to the rubbing cloth. Therefore, it is possible to remove the attached dust more reliably. Furthermore, by using a roll-shaped brush, the tip of the brush can be inserted into the inside of the bristle of the rubbing cloth, so that the attached dust can be reliably removed.

And since it has a dust exhausting process, the dust removed by the rubbing cloth dust removal process can be exhausted, and it can prevent that the removed dust adheres to a rubbing roller. Therefore, it is possible to obtain a high-quality optical compensation film required by increasing the brightness and definition of a liquid crystal display device using a long flexible strip subjected to rubbing treatment. Furthermore, since the rubbing roller can reliably remove dust, dust does not accumulate on the rubbing roller, and the life of the rubbing roller can be extended.
In addition, by vibrating the bristle feet of the brush with ultrasonic waves, dust on the bristle feet of the brush can be made difficult to adhere. Therefore, since the dust removal amount of the rubbing roller can be further reduced, there is no accumulation of dust on the rubbing roller, and the life of the rubbing roller can be extended.

  In the present invention, the roll-shaped brush is preferably brought into contact with the surface of the rubbing cloth while vibrating left and right.

  Since the roll-shaped brush vibrates left and right (in the roll width direction), it is possible to prevent the rubbing cloth from partially passing by dust adhering to the brush.

  Moreover, in this invention, it is preferable to have a brush dust removal process which removes the dust adhering to the said roll-shaped brush.

  The brush dust removing step includes (1) blowing air to the roll-shaped brush for suction, (2) bringing a brush surface dust removing member into contact with the roll-shaped brush, and (3) applying to the roll-shaped brush. It is conceivable to remove dust adhering to the dust removing roll by bringing the dust removing roll into contact with the exhaust and exhausting the dust. In the case of (3), it is more preferable to contact a second dust removing roll that removes dust adhering to the dust removing roll.

  By having this brush dust removal process, the dust adhering to a brush can be removed reliably. Therefore, since the rubbing roller can be further dust-removed with the brush, there is no accumulation of dust on the rubbing roller, and the life of the rubbing roller can be extended.

  Moreover, in this invention, it is preferable that the said roll-shaped brush has electroconductivity.

  Since the brush has conductivity, it becomes easy for dust to adhere to the brush, and it is possible to easily remove the dust from the rubbing cloth.

  In the present invention, the distance between the roll-shaped brush and the base fabric structure of the rubbing cloth is 0.05 to 5 mm.

By setting the distance between the tip of the roll-shaped brush and the rubbing cloth's fabric structure within the above range, the rubbing cloth's bristle feet are uniform in the subsequent rubbing cloth treatment process without damaging the rubbing cloth's fabric structure. The rubbing treatment process can be performed to such an extent that it can be made.
In this invention, it is preferable to have the rubbing cloth correction process which aligns the hair of the said rubbing cloth.

  In the rubbing cloth dust removal process, dust is removed by bringing a roll-shaped brush into contact with the rubbing cloth, so that the hair of the rubbing cloth becomes non-uniform. Even if the foot becomes non-uniform, it can be made uniform.

  According to the present invention, after the alignment film is formed using the rubbing roller, the dust is removed by bringing the roll-shaped brush into contact with the rubbing cloth of the rubbing roller, so that the dust can be reliably removed. . Moreover, it can suppress that a rubbing cloth passes partially by the dust adhering to a brush because a roll-shaped brush vibrates right and left (roll width direction).

  Therefore, productivity can be improved by efficiently removing dust generated in the rubbing process and extending the life of the rubbing roller.

The block diagram which shows typically the rubbing processing apparatus of this invention The block diagram which shows typically the part of rubbing processing apparatus of this invention which looked at the front The block diagram which shows typically another aspect of the rubbing processing apparatus of this invention The block diagram which shows typically another aspect of the rubbing processing apparatus of this invention The block diagram which shows typically another aspect of the rubbing processing apparatus of this invention The block diagram which shows typically another aspect of the rubbing processing apparatus of this invention Table showing the results of the examples

  Hereinafter, preferred embodiments of a rubbing treatment method and a rubbing treatment apparatus of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic view showing a configuration of a rubbing treatment apparatus 10 according to an embodiment of the present invention, and FIG. 2 is a schematic view of a part of the rubbing treatment apparatus 10 according to an embodiment of the present invention as viewed from the front.

  As shown in FIG. 1, the rubbing treatment device 10 is a device that performs rubbing treatment by bringing a rubbing roller 16 into contact with a transparent film (corresponding to a long flexible film) 12, and the transparent film 12 has an upper surface. The vehicle travels while being pressed by the pair of rollers 14 and 14. The alignment film forming material is formed on the lower surface of the transparent film 12.

  First, the rubbing treatment method of the present invention includes an alignment film forming step of forming an alignment film by bringing the rubbing cloth 28 attached to the rubbing roller 16 into contact with the alignment film forming material layer of the transparent film 12.

  The alignment film forming material layer may be transparent and can be aligned by alignment treatment. Examples of the material for forming the alignment film forming material layer include polymethyl methacrylate, acrylic acid / methacrylic acid copolymer, styrene / maleimide copolymer, polyvinyl alcohol, poly (N-methylolacrylamide), styrene / vinyltoluene copolymer. Polymers such as polymers, chlorosulfonated polyethylene, nitrocellulose, polyvinyl chloride, chlorinated polyolefins, polyesters, polyimides, vinyl acetate copolymers, ethylene / vinyl acetate copolymers, carboxymethyl cellulose, polyethylene, polypropylene and polycarbonate, and silanes Examples of the compound include a coupling agent. Examples of preferred polymers include polyimide, polystyrene, styrene derivative polymers, gelatin, polyvinyl alcohol or polyvinyl alcohol derivatives. A material having a polymerizable group as the material for forming the alignment film forming material layer is effective for increasing the bonding strength with the liquid crystal layer.

  The rubbing roller 16 is disposed so as to contact the alignment film forming material layer of the transparent film 12. That is, the rubbing roller 16 is disposed on the lower side of the transparent film 12 and engaged with the lower surface of the transparent film 12 at a predetermined wrap angle (for example, 4 to 20 °). The rubbing roller 16 is formed by bonding a rubbing cloth 28 to a cylindrical shaft, and has an outer diameter of 100 to 500 mm, preferably 150 to 300 mm. Examples of the rubbing cloth 28 include a sheet obtained from rubber, nylon, polyester, etc., a sheet (velvet etc.) obtained from nylon fiber, rayon fiber, polyester fiber, paper, gauze, felt and the like.

  The rubbing roller 16 is connected to a rotational drive source (not shown) and is controlled to rotate at a predetermined speed (for example, 200 to 600 rpm) in the direction opposite to the traveling direction of the transparent film 12. As a result, the alignment film forming material layer of the transparent film 12 in the transported state and the surface of the rubbing roller 16 rub against each other at the contact point P, and the alignment film forming material layer is rubbed to form an alignment film. The rubbing roller 16 is preferably configured such that its rotational speed can be controlled within a predetermined range, for example, a range up to about 1000 rpm. Moreover, it is preferable that the rubbing roller 16 is configured such that its rotation axis can be adjusted within a predetermined range, for example, an angle of 0 to 50 °. Further, the rubbing roller 16 or the roller 14 is attached with a tension measuring device capable of measuring the tension difference in the width direction of the transparent film 12 so that the tension difference is within a predetermined range (for example, 0.1 N / cm or less). It is preferable to control.

  The present invention includes a rubbing cloth dust removing step of removing dust on the rubbing cloth 28 after forming the alignment film. By removing the dust on the rubbing cloth 28 in this rubbing cloth dust removing step, it is possible to prevent the dust from adhering to the transparent film 12 when the alignment film is formed next. Can be manufactured.

  The rubbing cloth dust removal step can be performed using a roll-shaped brush 26 as shown in FIG. The roll-shaped brush 26 is provided on the downstream side of the contact point P with respect to the rotation direction of the rubbing roller 16. The roll-shaped brush 26 is configured to remove dust attached to the rubbing cloth 28 by contacting the rubbing cloth 28. The roll-shaped brush 26 is rotated in the direction opposite to the rotation of the rubbing roller 16.

  And as shown in FIG. 2, it is preferable to vibrate (oscillate) the brush 26 from side to side while maintaining the distance from the rubbing cloth 28. By oscillating, the contact location between the brush 26 and the pile yarn is not constant, so that it is possible to suppress the rubbing cloth from partially passing by dust adhering to the brush.

  In the rubbing cloth dust removal process, dust is removed by oscillating the roll-shaped brush, so the hair of the rubbing cloth becomes uneven, but by providing the rubbing cloth correction process Even if the hair of the rubbing cloth becomes non-uniform, it can be made uniform. Therefore, the rubbing process can be performed without lowering the rubbing performance.

  The rubbing cloth 28 is formed of a ground cloth structure and pile yarn, and even if dust generated by the alignment film forming process enters between the pile yarns, it can be easily removed by the roll-shaped brush 26. Can do.

  Further, in the present invention, the rubbing treatment device 10 in FIG. 1 includes an exhaust device 34. Since the exhaust device 34 can prevent the dust removed in the rubbing cloth dust removing process from reattaching to the rubbing cloth, it is possible to manufacture an optical compensation film with higher quality.

  In the present invention, the distance between the brush 26 and the rubbing cloth 28 is preferably such that the distance between the tip of the brush 26 and the cloth structure of the rubbing cloth is 0.05 to 5 mm. By setting the distance between the brush 26 and the fabric structure 30 within this range, dust adhering between the pile yarns can be easily removed.

  Moreover, it is preferable that the brush 26 has electroconductivity. By imparting conductivity to the brush 26, the dust easily adheres to the brush 26, so that the dust attached to the rubbing cloth can be removed.

  Furthermore, as shown in FIG. 1, the rubbing apparatus of the present invention preferably includes a correction member 24 on the downstream side of the brush 26 with respect to the rotation direction of the rubbing roller 16. In the alignment film forming step, the direction of the pile yarn disturbed by bringing the brush 26 and the pile yarn of the rubbing cloth 28 into contact with each other can be made constant by the correction member 24, so that an optical compensation film with good quality can be obtained. Can be manufactured.

  A metal surface roll can be used as the correction member 24. As the material for the metal surface, stainless steel, hard chrome plating, nickel plating, titanium, glass or the like can be preferably used.

  As described above, in the present invention, productivity can be improved by efficiently removing dust generated by the rubbing treatment and extending the life of the rubbing roller. Therefore, a higher quality optical compensation film can be produced efficiently.

  Furthermore, in the rubbing apparatus of the present invention, it is preferable that the roll-shaped brush 26 is vibrated ultrasonically. In addition to the left and right vibrations (oscillates) described above, the hair of the brush 26 itself is vibrated with ultrasonic waves, so that dust on the hair of the brush can be made difficult to adhere. Therefore, since the dust removal amount of the rubbing roller can be further reduced, there is no accumulation of dust on the rubbing roller, and the life of the rubbing roller can be extended.

  3-6 is a figure which shows the structure of a part of rubbing processing apparatus which shows another embodiment. What is different from the rubbing treatment apparatus 10 shown in FIG. 1 is that a brush dust removing means for removing dust attached to the brush 26 is provided.

  The rubbing treatment device 10 of FIG. 3 includes an air blow suction device 40 that blows air on a roll-shaped brush 26 for suction. With this device 40, the dust attached to the brush 26 can be surely removed, so that the dust attached to the brush 26 can be prevented from adhering again to the rubbing roller 16, and the dust accumulated on the rubbing roller. The life of the rubbing roller can be extended.

  The rubbing apparatus 10 of FIG. 4 includes a brush surface dust removing member 42 that contacts the roll-shaped brush 26. With this member 42, dust attached to the brush 26 can be peeled off from the brush 26 and removed by the exhaust device 34, so that the dust attached to the brush 26 can be prevented from attaching to the rubbing roller 16 again. There is no accumulation of dust on the rubbing roller, and the life of the rubbing roller can be extended. The position of the brush surface dust removing member 42 is preferably in the vicinity of the exhaust port of the exhaust device 34 as shown in FIG. 4, but it is effective at any position within the exhaust device 34.

  The rubbing treatment device 10 of FIG. 5 includes a dust removal roll 44 that contacts the roll-shaped brush 26 and an exhaust device 46. The exhaust device 34 exhausts the dust removed from the brush 26 by the dust removal roll 44. As a result, the dust attached to the brush 26 can be peeled off from the brush 26 and removed, so that the dust attached to the brush 26 can be prevented from adhering to the rubbing roller 16 again, so that optical compensation with higher quality can be achieved. A film can be produced.

  As shown in FIG. 6, the rubbing apparatus 10 of FIG. 5 preferably further includes a second dust removing roll 48 that removes dust attached to the dust removing roll 44. Since the dust adhering to the dust removing roll 44 can be peeled off and removed by the second dust removing roll 48, the dust adhering to the brush 26 can be further prevented from adhering again to the rubbing roller 16, and the quality can be improved. An optical compensation film can be produced.

  Next, the operation of the rubbing processing device 10 will be described.

  In the rubbing apparatus 10, dust is generated because the rubbing cloth 28 affixed to the transparent film 12 and the rubbing roller 16 is brought into contact. When this dust adheres to the transparent film 12 and is transported to a subsequent apparatus (for example, a coating process in which a coating liquid containing a liquid crystal discotic compound is coated on the alignment film), the cause of the bright spot defect of the optical compensation film It becomes. Similarly, when dust adheres not only to the surface of the transparent film 12 but also to the surface of the rubbing cloth 28, the performance of the rubbing treatment is lowered to cause a bright spot defect in the optical compensation film, or dust is rubbed. There is a risk of causing bright spot defects from the cloth 28 to the transparent film 12.

  For this reason, in the rubbing treatment apparatus 10, a roll-like brush 26 that vibrates left and right is provided and brought into contact with the rubbing cloth 28 to remove dust adhering to the rubbing cloth 28.

  Furthermore, in the rubbing treatment apparatus 10 of the present embodiment, it is possible to align the bristles of the rubbing cloth 28 that is disturbed by providing the correction member 24 and contacting the brush 26 to remove dust. Thereby, since the rubbing process can be performed in a state where the hairs are aligned, the rubbing process can be performed without deteriorating the rubbing performance of the formed alignment layer.

  Further, since the dust adhering to the rubbing cloth 28 can be reduced as compared with the conventional rubbing processing apparatus, the rubbing performance is lowered by the dust adhering to the rubbing cloth 28, or the dust on the rubbing roller 16 is transferred to the transparent film 12. Can be prevented.

  Therefore, according to the present embodiment, since there is no adhesion of dust and an alignment film subjected to a high-quality rubbing process can be formed, by producing an optical compensation film using this transparent film 12 In addition, high-quality optical compensation with few bright spot defects can be provided.

(Creation of a long flexible strip having an orientation film forming material layer)
Long chain alkyl-modified polyvinyl alcohol (MP-203, manufactured by Kuraray Co., Ltd.) 5 on one side of a long film of cellulose triacetate (Fujitack, manufactured by Fuji Film Co., Ltd., thickness: 100 μm, width: 500 mm) 5 A weight% aqueous solution was applied and dried at 90 ° C. for 4 minutes. Thus, an alignment film forming material layer having a thickness of 2.0 μm was formed.

(Rubbing treatment of alignment film forming material layer)
The long flexible film provided with the alignment film forming material layer was rubbed on the surface of the alignment film forming material layer using the apparatus shown in FIG. The transparent film provided with the alignment film forming material layer was continuously conveyed in the direction of the arrow at 20 m / min. The transparent film is conveyed while being suppressed from above by a roller (roller outer diameter: 90 mm, length: 1650 mm), and a rubbing roller (outer diameter: 300 mm) pressed from below is rotated at 400 rpm in the direction opposite to the running direction. A rubbing treatment was performed by bringing a rubbing cloth (velvet) affixed to the cylindrical shaft into contact with the alignment film forming material layer.

  In the experiments 2 to 13 in the table of FIG. 7, the rubbing roller removes dust adhering to the rubbing cloth by bringing the brush 26 into contact with the surface of the rubbing roller while performing the rubbing process. The brush 26 was imparted with static elimination properties by grounding. Further, the distance between the tip of the brush 26 and the fabric structure was 0.5 mm except for Experiments 2 and 4. The distance between the tip of the brush 26 and the fabric structure was measured with a thickness gage (thickness gauge) at the time of installation. Further, the dust removed by contacting the brush 26 is exhausted by the dust exhaust device 34 shown in FIG. Further, a rubbing cloth (hair foot) correcting member is provided next to the dust removing device from the upstream side in the running direction of the rubbing roller to align the rubbing cloth.

  Here, in Experiments 5 to 11 and 13, the brush 26 was oscillated (left and right vibration). In Experiments 10, 11, and 13, ultrasonic vibration was applied to the brush 26. Moreover, in Experiments 11-13, it experimented with the brush dust removal apparatus of FIG. Further, in Experiment 6, the brush surface dust removing member (blade) 42 in FIG. 4 is located near the exhaust port of the dust removing device, and in Experiment 7, the brush surface dust removing member (blade) 42 in FIG. 4 is separated from the exhaust port of the dust removing device. Installed in a different position. In Experiment 8, the dust removal roll 44 and the exhaust device 46 of FIG. 5 were installed, and in Experiment 9, the dust removal roll 44, the exhaust device 46, and the second dust removal roll 48 of FIG. 6 were installed.

[Test results]
The number of bright spot defects of the transparent film after the rubbing treatment of Examples 1 to 13 was evaluated based on the bright spot occurrence frequency of a surface inspection apparatus using a CCD camera. The results are shown in the table of FIG. The symbols in the table are as follows.
◎ ・ ・ ・ High quality (less than 0.5 / m)
○ ... within quality tolerance (0.5 / m or more, less than 0.8 / m)
Δ: Acceptable quality limit (0.8 / m or more, less than 1.1 / m)
× ・ ・ ・ Not acceptable for quality (1.1 pieces / m or more)
Furthermore, the rubbing durability of Experiments 1 to 13 was also evaluated. The results are shown in the table of FIG. The symbols in the table are as follows.
◎ ... 20000m or more ○ ... 15000m or more, less than 20000m Δ ... 10000m or more, less than 15000m x ... less than 10000m As can be seen from the evaluation results of Experiments 1 to 13, a brush and a dust exhaust device were provided In Experiments 2 to 13, high quality films could be obtained, and in Experiments 5 to 11 and 13 where the brush was oscillated, the rubbing durability was long.

  In addition, from Experiments 2 to 4, the distance between the roll-shaped brush and the fabric structure is 0.05 to 5 mm, so that the number of bright spot defects is small (the evaluation of the number of bright spot defects is more than Δ). It was found that a high quality film can be obtained.

  DESCRIPTION OF SYMBOLS 10 ... Rubbing processing apparatus, 12 ... Transparent film, 14 ... Roller, 16 ... Rubbing roller, 24 ... Correction member, 26 ... (roll-shaped) brush, 28 ... Rubbing cloth, 34 ... Dust exhaust device, 40 ... Air blow suction device 42 ... Brush surface dust removal member (blade), 44 ... Dust removal roll, 46 ... Exhaust device, 48 ... Dust removal roll

Claims (11)

While the long flexible film provided with the alignment film forming material layer is moved in the longitudinal direction, a rubbing cloth affixed to a rubbing roller is brought into contact with the surface of the alignment film forming material layer in a rotating state. An alignment film forming step of forming
After the rubbing cloth comes into contact with the long flexible film, a rubbing cloth dust removing step of removing a dust attached to the rubbing cloth by bringing a roll-shaped brush into contact with the surface of the rubbing cloth;
Have a, a dust exhaust evacuating remove dust removed by the rubbing cloth dust step,
The roll-like brush, rubbed wherein that you have been ultrasonic vibration.   The rubbing treatment method according to claim 1, wherein the roll-shaped brush is brought into contact with the surface of the rubbing cloth while vibrating left and right. Rubbing method according to claim 1 or 2, characterized in that it has a brush dust removal step of removing dust adhering to the rolled brush. The rubbing treatment method according to claim 3 , wherein in the brush dust removing step, air is blown to the roll brush for suction. 4. The rubbing treatment method according to claim 3 , wherein in the brush dust removing step, a brush surface dust removing member is brought into contact with the roll-shaped brush. The rubbing treatment method according to claim 3 , wherein in the brush dust removing step, dust attached to the dust removing roll is removed by bringing the dust removing roll into contact with the roll-shaped brush and exhausting. The rubbing treatment method according to claim 6 , wherein in the brush dust removing step, a second dust removing roll that removes dust attached to the dust removing roll is brought into contact. Rubbing method according to any one of 請 Motomeko 1-7 you, characterized in that the roll-like brush is electrically conductive. The rubbing treatment method according to any one of claims 1 to 8 , wherein a distance between the roll-shaped brush and the rubbing cloth is 0.05 to 5 mm. The rubbing treatment method according to any one of claims 1 to 9 , further comprising a rubbing cloth straightening step for aligning hairs of the rubbing cloth. A method for producing an optical compensation film, characterized in that it is produced using a long flexible film that has been rubbed by the rubbing treatment method according to any one of claims 1 to 10 .

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