JP2017027037A - Polarizer production device, polarizer production method and polarizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polarizer production device, a polarizer production method, capable of preventing foreign matter adhesion to an optical film, and a polarizer produced by the same method.SOLUTION: The invention discloses a polarizer production device, and a polarizer production method for supplying an optical film to a joint nip roll side, so as to form 0 degree or a sharp angle with respect to an opposite direction of a gravity direction, when a polarization film and the optical film are jointed by the joint nip roll, and a polarizer produced by the same production method. According to the invention, foreign matter adhesion which may be included in a polarizer to the optical film can be prevented, and a proportion defective of the polarizer is reduced and production efficiency is improved.SELECTED DRAWING: Figure 1

Description

The present invention relates to a polarizing plate manufacturing apparatus, a polarizing plate manufacturing method, and a polarizing plate.

In general, a polarizing plate is formed by bonding a plurality of films, for example, a polarizing film, a retardation film, and the like, using an aqueous adhesive or a pressure-sensitive adhesive. On the other hand, the process of joining a polarizing film and the film bonded together and manufacturing a polarizing plate is performed manually, or by supplying a film to the apparatus which combined the some roller. For example, as a method of bonding the transparent protective film to both surfaces of the polarizer, a simultaneous lamination method in which the polarizer is transported between a pair of rolls and the transparent protective film is transported to both surfaces and the transparent protective film is simultaneously bonded, A sequential laminating method is adopted in which the polarizer is transported between the rolls and the transparent protective film is transported and bonded to one side thereof, and then the transparent protective film is bonded to the other side of the polarizer.

Japanese Unexamined Patent Publication No. 2004-053773

An object of this invention is to provide the polarizing plate provided by the manufacturing apparatus of the polarizing plate which can prevent foreign material adhesion to an optical film etc., the manufacturing method of a polarizing plate, and the manufacturing method.

In addition, the present invention provides a polarizing plate manufacturing apparatus, a polarizing plate manufacturing method, and a configuration that allow bonding by adjusting the angle formed by the stretching direction of the polarizing film and the optical film or the direction of the optical properties. It is an object of the present invention to provide a polarizing plate.

Furthermore, the polarizing plate of the present invention provides a polarizing plate that can prevent sticking due to static electricity when separating the individual in a laminated state, a polarizing plate manufacturing apparatus for manufacturing the polarizing plate, and a polarizing plate manufacturing method With the goal.

Other objects and methods of the present invention can be understood by the following description, and can be more clearly understood by embodiments of the present invention. The objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.

The polarizing plate manufacturing apparatus of the present invention for achieving the above-described object includes a polarizing film transport unit that transports a polarizing film, and an optical film that is attached to a part of the polarizing film transported from the polarizing film transport unit. A joining nip roll and an angle forming roll that supplies the optical film to the joining nip roll side in a direction that forms 0 degree or an acute angle with respect to a direction opposite to the direction of gravity can be included.

The acute angle direction may be ± 10 degrees with respect to a direction opposite to the gravity direction.

Further, the acute angle direction may be +5 degrees to −6 degrees with respect to a direction opposite to the gravity direction.

The polarizing film transport unit can supply the polarizing film to the bonding nip roll side in a horizontal direction or an oblique upper direction.

The polarizing film transport unit may include a conveyor belt on which the polarizing film is seated and transported, and may include one or more suction units.

An antistatic treatment unit for applying an antistatic solution to the optical film may be further included.

The antistatic treatment unit may include an antistatic droplet discharge unit for discharging antistatic droplets and a swipe unit for swiping the discharged antistatic liquid.

The polarizing film transported by the polarizing film transport unit is a sheet-shaped polarizing film including a polarizer and a release paper attached to one side of the polarizer, and is an adhesive for releasing the release paper. A sticking nip roll that presses the tape against the release paper may be further included.

It further includes a release guide that guides the recovery of the pressure-bonded release paper and the adhesive tape, and an interval between the release guide and the joining nip roll may be greater than 0 mm and less than or equal to 80 mm.

The interval between the sticking nip roll and the joining nip roll may be 200 mm or more and 600 mm or less.

Moreover, the manufacturing method of the polarizing plate which concerns on embodiment of this invention conveys a polarizing film to the joining nip roll side, and affixes the optical film supplied to the said joining nip roll side on the said polarizing film conveyed to the said joining nip roll. In the manufacturing method of the polarizing plate to be attached, the optical film forms 0 degree or an acute angle with respect to the direction opposite to the gravity direction, and is supplied to the bonding nip roll side.

The acute angle may be +5 degrees to -6 degrees.

The polarizing film can be conveyed in the horizontal direction or in the upward oblique direction to the bonding nip roll side.

The optical film can be subjected to antistatic treatment before being supplied to the joining nip roll side.

The antistatic treatment may be an antistatic coating treatment.

The antistatic treatment may be a treatment applied to the other side surface of the optical film on the polarizing film bonding surface side.

The polarizing film may include a first protective layer, a polarizer, and a second protective layer, and the optical film may be bonded to the second protective layer.

Here, the second protective layer may be a retardation layer.

The polarizing plate which concerns on embodiment of this invention can be provided with the manufacturing method of the polarizing plate mentioned above.

The polarizing plate according to the embodiment of the present invention includes a first protective layer, a polarizer, and a second protective layer in order, and an antistatic treatment is performed on the opposite side of the polarizer bonding surface of the second protective layer. The protective film may be further included.

The second protective layer may be a retardation layer.

The antistatic treatment may be an antistatic coating treatment.

The protective film subjected to the antistatic treatment may contain an antistatic agent therein.

According to the polarizing plate manufacturing apparatus or the polarizing plate manufacturing method according to the embodiment of the present invention, it is possible to prevent foreign matters from adhering to the optical film that can be included in the polarizing plate. Moreover, the polarizing plate provided by the polarizing plate manufacturing apparatus or the polarizing plate manufacturing method according to the embodiment of the present invention can be provided in a state where adhesion of foreign matters is reduced.

Furthermore, according to the embodiment of the present invention, the defective rate of the polarizing plate can be reduced and the production efficiency can be improved.

Furthermore, according to the polarizing plate of the present invention, when individual polarizing plates are separated in a laminated state, sticking due to static electricity can be prevented and separation of the polarizing plates can be facilitated.

Moreover, according to the embodiment of the present invention, the angle formed by the stretching direction of the polarizing film and the optical film or the direction showing the optical characteristics can be adjusted.

FIG. 1 is a view showing a polarizing plate manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a diagram showing a positional relationship between a joining nip roll and an angle forming roll in the polarizing plate manufacturing apparatus of FIG. FIG. 3 is a state diagram showing a state in which the polarizing film and the polarizing film release paper are bonded in the polarizing plate manufacturing apparatus of FIG. 1. FIG. 4 is a state diagram showing a state where the polarizing film release paper and the adhesive tape shown in FIG. 1 are attached. FIG. 5 is a state diagram showing a state where the polarizing film release paper and the adhesive tape shown in FIG. 1 are peeled off from being attached. FIG. 6 is a state diagram showing a state in which the polarizing film and the optical film are bonded. FIG. 7 is a diagram showing the angle between the second joining roll and the angle forming roll of the joining nip roll shown in FIG. 1. FIG. 8 is a diagram showing an angle different from the angle shown in FIG. FIG. 9 is a diagram illustrating a method for manufacturing a polarizing plate according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings.

In the description of the present invention, when it is determined that there is a possibility that a specific description related to the related art will obscure the gist of the present invention, a detailed description thereof will be omitted. Moreover, the term mentioned later is a term defined in consideration of the function in this invention, and may differ with a user, an operator's intention, or a custom. Therefore, the definition should be made based on the contents throughout this specification.

The technical idea of the present invention is determined by the claims. The following embodiment is merely a means for efficiently explaining the technical idea of the present invention to a person skilled in the art.

FIG. 1 is a view showing a polarizing plate manufacturing apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention includes an optical film 1 when the optical film 1-4 is attached to the polarizing film 1-1 in the manufacturing process of the polarizing plate. -4 can be prevented from attaching foreign matter. For this purpose, the polarizing plate manufacturing apparatus 1 can include a polarizing film transport unit 3, a joining nip roll 200, and an angle forming roll 300.

Here, in the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention, the angle formed by the drawing direction of the polarizing film and the optical film or the direction indicating the optical characteristics can be adjusted. Specifically, as shown in FIG. 1, the polarizing film transport unit 3 transports a cut sheet (sheet) polarizing film 1-1, and the transported sheet-shaped polarizing film 1-1 The optical film 1-4 supplied in the form of a roll from the optical film winding roll 20 is joined. That is, since the polarizing film 1-1 and the optical film 1-4 are joined in a sheet-to-roll form, the drawing direction of the cut sheet-shaped polarizer 1-1 or a direction indicating optical characteristics is shown. By adjusting the angle, the angle formed by the direction of the optical characteristics of the polarizing film and the optical film can be adjusted. Here, the polarizing film and the optical film may have a phase difference, and the angle between them may be 45 degrees.

First, the polarizing film conveyance part 3 can convey to the polarizing plate manufacturing apparatus 1 in the state to which the polarizer 1-1 and the release paper 1-2 were adhere | attached. The polarizer 1-1 is a film for realizing the polarization function in the polarizing plate, and the release paper 1-2 is attached to one surface (SP surface) of the polarizer 1-1 via an adhesive. 1 can be combined. In the following, “polarizing film” 1-1 mainly means a polarizer 1-1 from which a release paper 1-2 is released. However, for convenience of explanation, the polarizer 1-1 and the release paper 1-2 attached to the polarizer 1-1 are collectively referred to as “polarizing film”.

On the other hand, the polarizing film transport unit 3 may include a conveyor belt that allows the polarizing film 1-1 to which the release paper 1-2 is bonded to be seated and transported. The polarizing film 1-1 is seated and conveyed on the conveyor belt. Although not shown, the conveyor belt may be provided with suction holes that allow the suction unit 40 described later to seat the polarizing film 1-1.

Moreover, in order to ensure that the polarizing film 1-1 is securely seated on the conveyor belt, it is possible to include a suction unit 40 that is located below the conveyor belt and sucks air. The suction part 40 can suck ambient air by forming a negative pressure. The suction unit 40 secures the polarizing film 1-1 to the conveyor belt, and enables the stable polarizing film 1-1 to be conveyed stably by circulation of the conveyor belt. Thereby, the efficiency of the process can be improved and the defect rate can be reduced. That is, when the polarizing film 1-1 is not stably fixed during the conveyance process by the conveyor belt, distortion such as curl may occur in the polarizing film 1-1. This ultimately induces a bonding error in the bonding process of the polarizing plates, lowers the process efficiency, and causes defective products. One or a plurality of suction portions 40 can be provided on the lower side of the conveyor belt.

The adhesive tape supply unit can supply an adhesive tape for releasing the release paper 1-2. A release paper is attached to the lower side of the sheet-like polarizer 1-1, and an adhesive tape 1-3 for releasing the release paper 1-2 can be supplied from the lower side of the polarizing film 1-1. The adhesive tape supply unit passes through the adhesive tape take-up roll on which the adhesive tape 1-3 is taken up and the adhesive tape supplied from the adhesive tape take-up roll is supplied to the application nip roll 100 described later. And an adhesive tape via roll part 14 to be included. Here, the number of rolls 14 via the adhesive tape may be one or more, and the number and position thereof can be variously set.

The sticking nip roll 100 can press and bond the adhesive tape 1-3 to the release paper 1-2 in order to release the release paper 1-2 attached to the polarizer 1-1. After passing between the pasting nip rolls 100 in a state where the release paper 1-2 and the adhesive tape 1-3 are pressed, the release paper 1-2 and the adhesive tape 1-3 can be released together. Here, in order to collect the release paper 1-2 and the adhesive tape 1-3 which have been released, the first collection roll 12 can be provided. Moreover, the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention guides the released release paper 1-2 and the adhesive tape 1-3 so as to be recovered by the first recovery roll 12. Guides can be included. In addition, the adhesive tape affixed on the release paper 1-2 can be affixed on one part or all part of the release paper 1-2. The adhesive tape 1-3 may be provided with the same size as the release paper 1-2 and may be attached to the release paper 1-2. The adhesive tape 1-3 may be provided with a size exceeding the size of the release paper 1-2. It may be affixed stably to the entire pattern 1-2.

Hereinafter, a process of bonding the optical film 1-4 after the release paper 1-2 is released from the polarizing film will be described.

As described above, the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention may include the joining nip roll 200 and the angle forming roll 300 in order to join the optical film 1-4 to the polarizing film 1-1. it can.

The joining nip roll 200 joins the optical film 1-4 to the polarizing film 1-1 transported from the polarizing film transport unit 3. That is, the polarizing film 1-1 and the optical film 1-4 are supplied between the rolls included in the joining nip roll 200, and the polarizer 1-1 and the optical film 1-4 can be joined by pressure bonding of the roll.

Further, the distance between the joining nip roll 200 and the above-described sticking nip roll 100 may be 200 mm or more and 600 mm or less. For example, the distance between the joining nip roll 200 and the sticking nip roll 100 may be 400 mm. When the interval between the joining nip roll 200 and the attaching nip roll 100 is less than 200 mm, the guide and releasing of the release paper 1-2 between the attaching nip roll 100 and the joining nip roll 200 are not smooth. In the process, the direction of the polarizing film may be shifted without being fixed, which increases the size of the apparatus and increases the possibility of foreign matter adhesion.

Further, the interval between the release guide 60 and the joining nip roll 200 may be greater than 0 mm and not greater than 80 mm. For example, the distance between the release guide 60 and the joining nip roll 200 may be 40 mm. That is, when the release paper 1-2 that has been released and the adhesive tape 1-3 that is bonded to the release paper 1-2 are both guided by the release guide 60 and moved to the first collection roll 12, the release guide 60. By shortening the distance between the adhesive nip roll 200 and the joining nip roll 200, it is possible to smoothly convey the mold without shifting the direction when the polarizing film 1-1 is moved to the joining nip roll 200. Here, if there is no space between the release guide 60 and the joining nip roll 200, the release paper 1-2 cannot be collected smoothly, and if it exceeds 80 mm, the polarizing film 1-1 is distorted or warped. This may impair the stability of the process.

At this time, the optical film 1-4 supplied to the bonding nip roll 200 for bonding to the polarizing film 1-1 can be supplied via the angle forming roll 300.

The angle forming roll 300 can be supplied to the side of the joining nip roll 200 in a direction in which the optical film 1-4 forms 0 degrees or an acute angle with respect to the direction opposite to the direction of gravity. The initial setting position of the angle forming roll 300 can be vertically below the joining nip roll 200, but can be moved back and forth with respect to the joining nip roll 200. Here, the movement angle of the angle forming roll 300 can be within a range of 5 degrees when moving forward and within 6 degrees when moving backward. FIG. 2 is a diagram showing a positional relationship between the joining nip roll 200 and the angle forming roll 300 in the polarizing plate manufacturing apparatus of FIG.

On the other hand, the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention further includes an antistatic treatment unit 30 for applying an antistatic liquid to the optical film 1-4 conveyed by the polarizing film conveyance unit 3. Can do. In this embodiment, the polarizer 1-1 includes a polarizer and a protective layer (first protective layer) bonded to one side of the polarizer, or a protective layer (first protective layer) positioned or bonded to each side. A protective layer and a second protective layer). Here, when the polarizer 1-1 includes only the first protective layer, the optical film 1-4 can be bonded to the side surface opposite to the surface where the first protective layer is bonded. When the polarizer 1-1 includes the second protective layer, the optical film 1-4 can be bonded to the outside of the second protective layer. The optical film 1-4 can be bonded after antistatic treatment. Accordingly, when the polarizing plate according to the embodiment of the present invention is separated from the stacked state into individual polarizing plates for use, the generation of static electricity with other adjacent polarizing plates is reduced. Or it can be prevented.

The antistatic treatment unit 30 may include an antistatic droplet discharge unit 32 that discharges antistatic droplets and a swipe unit 34 that swipes the discharged antistatic liquid. The antistatic droplet discharge unit 32 can discharge an antistatic solution for antistatic treatment onto the optical film 1-4 in the form of droplets. The antistatic droplet discharge unit 32 can reciprocate in the width direction of the optical film 1-4 (direction perpendicular to the transport direction of the optical film) or the direction inclined in the transport direction of the optical film 1-4. Thereby, antistatic liquid can be apply | coated over the whole of the optical film 1-4. Next, the swipe part 34 plays a role of uniformly applying the antistatic liquid discharged on the optical film 1-4 (specifically, the sp surface of the optical film) onto the optical film 1-4. It is. That is, the swipe part 34 can swipe the optical film 1-4 with the brush part 36 (cloth etc.) of a flexible material. Therefore, one end of the brush portion 36 is in surface contact with the optical film 1-4 from which the antistatic liquid is discharged, and the optical film 1-4 is swiped by the conveyance of the optical film 1-4. Can do.

As described above, the polarizing plate processed by the antistatic processing unit 30 can easily separate the individual optical films 1-4 in a stacked state before use. That is, the optical films 1-4 can be prevented from being adsorbed to each other by static electricity, and the process efficiency when the optical film 1-4 is used can be improved.

Below, the process before an optical film affixes on a polarizing film is demonstrated.

As described above, in the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention, in order to attach the optical film 1-4 to the polarizing film 1-1, the adhesive tape supply unit and the pasting are performed in the previous process. Nip roll 100.

As the adhesive tape supply unit, an adhesive tape for releasing the release paper 1-2 can be supplied. The adhesive tape supply unit supplies an adhesive tape take-up roll on which the adhesive tape 1-3 is taken up and an adhesive tape supplied from the adhesive tape take-up roll to an application nip roll (100) described later. For this purpose, an adhesive tape via roll part 14 can be included. Here, the number of rolls 14 via the adhesive tape may be one or more, and the number and position thereof can be variously set.

The sticking nip roll 100 can press and bond the adhesive tape 1-3 to the release paper 1-2 in order to release the release paper 1-2 attached to the polarizing film 1-1. After passing between the pasting nip rolls 100 in a state where the release paper 1-2 and the adhesive tape 1-3 are pressed, the release paper 1-2 and the adhesive tape 1-3 can be released together. Here, in order to collect the release paper 1-2 and the adhesive tape 1-3 which have been released, the first collection roll 12 can be provided. Moreover, the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention guides the released release paper 1-2 and the adhesive tape 1-3 to be recovered by the first recovery roll 12 so as to be recovered. A guide 60 may further be included. The adhesive tape 1-3 attached to the release paper 1-2 can be attached to a part or all of the release paper 1-2. The adhesive tape 1-3 may be provided with the same size as the release paper 1-2 and may be attached to the release paper 1-2. The adhesive tape 1-3 may be provided with a size exceeding the size of the release paper 1-2. You may affix to 1-2 whole stably.

In the polarizing plate manufacturing apparatus 1 according to the present invention as described above, when the polarizing film 1-1 and the optical film 1-4 are respectively transported from the polarizing film transport unit 3 to the pasting nip roll 100 and the joining nip roll 200, respectively, Follow the procedure as follows.

FIG. 3 is a state diagram showing a state in which the polarizing film 1-1 and the polarizing film release paper are bonded to each other in the polarizing plate manufacturing apparatus shown in FIG. 1, and FIG. FIG. 5 is a state diagram showing a state in which the pattern paper and the adhesive tape are attached, and FIG. 5 shows a state in which the polarizing film release paper and the adhesive tape shown in FIG. FIG. 6 is a state diagram showing a state in which the polarizing film and the optical film are attached.

First, as shown in FIG. 3, the polarizing films 1-1 and 1-2 to which the polarizer 1-1 and the release paper 1-2 are attached are conveyed by the polarizing film conveyance unit 3 to the application nip roll 100 side. . The polarizer 1-1 and the release paper 1-2 pass between the rolls included in the sticking nip roll 100. Here, when the polarizer 1-1 and the release paper 1-2 pass between the adhesive nip rolls 100, the adhesive tape 1-3 supplied from the adhesive tape take-up roll 10 is turned into the release paper by the adhesive nip roll 100. Can be crimped and pasted. The polarizer 1-1, release paper 1-2, and adhesive tape 1-3 provided in this way are as shown in FIG. In this way, by passing the adhesive nip roll 100 between the adhesive tape 1-3 and the release paper 1-2, distortion such as curl is prevented from occurring in the polarizer 1-1. it can. Further, by strengthening the adhesion between the adhesive tape 1-3 and the release paper 1-2, the release paper 1-2 can be released more stably by the adhesion induction of the adhesive tape 1-3.

Next, as shown in FIG. 5, the release paper 1-2 is released from the polarizer 1-1 by the adhesive tape 1-3. The release paper 1-2 and the adhesive tape 1-3 thus released are collected on the first collection roll 12 by the guide of the release guide.

Then, as shown in FIG. 6, the polarizer 1-1 from which the release paper 1-2 and the adhesive tape 1-3 are released passes between the joining nip rolls 200. Here, when the polarizer 1-1 passes between the joining nip rolls 200, the optical film 1-4 supplied from the optical film take-up roll 20 is joined from the optical film via roll parts 26a, 26b, 26c, and 26d. It is conveyed by the nip roll 200 and affixed on the polarizer 1-1. One or a plurality of the optical film via roll portions 26a, 26b, 26c, and 26d may be provided, and the number and position thereof can be set variously.

Next, before transporting the optical film 1-4 to the joining nip roll 200, in order to prevent the generation of static electricity in the optical film 1-4, the antistatic treatment unit 30 located above the optical film 1-4, An antistatic solution can be applied to the optical film 1-4. And in order to distribute an antistatic liquid uniformly on the optical film 1-4, the swipe part 34 can be provided.

On the other hand, the optical film 1-4 conveyed from the optical film via roll can be supplied to the joining nip roll 200 side by the angle forming roll 300 in a direction that forms 0 degree or an acute angle with respect to the opposite direction of the gravity direction. Details of the angle forming roll 300 will be described later with reference to FIGS. 7 and 8. And the 2nd collection | recovery roll 22 can collect | recover the optical film 1-4 and the optical film release paper which released the said optical film 1-4.

FIG. 7 is a diagram showing angles between the second joining roll and the angle forming roll of the joining nip roll shown in FIG. 1, and FIG. 8 is a diagram showing an angle different from the angle shown in FIG.

As shown in FIGS. 7 and 8, the angle forming roll 300 supplies the optical film 1-4 to the joining nip roll 200 side so as to form a predetermined angle θ with respect to the direction opposite to the gravity direction G. it can. Here, the predetermined angle may be 0 degree (see FIG. 7) or an acute angle (see FIG. 8), and the acute angle may be ± 10 degrees. By making the supply direction of the optical film 1-4 on the side of the bonding nip roll 200 with the angle forming roll 300 as described above, it is possible to minimize foreign matter from adhering to the optical film 1-4. In addition, the acute angle may be +5 degrees to −6 degrees in order to achieve the effect of preventing foreign matter adhesion and the efficient use of the apparatus at the same time. Here, “+5 degrees to −6 degrees” means within 5 degrees when moving forward (opposite to the supply direction of the polarizing film 1-1) and backward (supplying direction of the polarizing film 1-1). It means the range within 6 degrees when moving. The acute angle movement of the angle forming roll 300 may be a movement on the same plane, or a movement on a different plane (for example, a circular or parabolic movement).

Furthermore, the polarizing plate manufacturing apparatus according to the embodiment of the present invention may supply the polarizing film in the horizontal direction from the polarizing film transport unit 3 to the bonding nip roll 200 side, and supply the polarizing film in the upward oblique direction. May be.

On the other hand, the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention can be located in a chamber. Dust and the like generated by the foreign matter in the chamber and the release of the release paper fall down due to gravity. In order to prevent such falling foreign matter from adhering to the optical film, in the polarizing plate manufacturing apparatus 1 according to the embodiment of the present invention, the optical film 1 conveyed to the bonding nip roll 200 side by the angle forming roll 300. The direction of −4 can be set to a direction inclined by +10 degrees to −10 degrees with respect to the direction opposite to the gravity direction. Thereby, it can prevent that the foreign material which falls below adheres to an optical film. Further, as described above, the same direction is set to a direction inclined by +5 to -6 degrees with respect to the opposite direction of the gravity direction (within 5 degrees when moving forward and within 6 degrees when moving backward). By doing so, it is possible to more efficiently prevent foreign matter from adhering. Here, “+5 degrees to −6 degrees” means within 5 degrees when moving forward (opposite to the supply direction of the polarizing film 1-1) and backward (supplying direction of the polarizing film 1-1). It means the range within 6 degrees when moving. The acute angle movement of the angle forming roll 300 may be a movement on the same plane, or a movement on a different plane (for example, a circular or parabolic movement).

Next, with reference to FIG. 9, the manufacturing method of the polarizing plate which concerns on other embodiment of this invention is demonstrated concretely. In the following, when a person skilled in the art can realize the manufacturing method of the polarizing plate according to the present embodiment from the configuration of the polarizing plate manufacturing apparatus according to the embodiment of the present invention described above, the specific description thereof will be omitted. To do.

In the method for manufacturing a polarizing plate according to another embodiment of the present invention, the polarizing film 1-1 is transported to the bonding nip roll 1-4 side (S1), and the polarizing film 1-1 is transported to the bonding nip roll 1-4. Then, the optical film 1-4 supplied (Sa) to the bonding nip roll 200 side is bonded (S2). That is, the polarizing film 1-1 and the optical film 1-4 can be supplied between the rolls included in the joining nip roll 200, and the polarizing film 1-1 and the optical film 1-4 can be attached by pressure bonding of the roll. .

At this time, the optical film 1-4 can be supplied to the bonding nip roll 200 side so as to form an angle of 0 degrees or an acute angle with respect to the direction opposite to the direction of gravity. Here, the optical film 1-4 supplied to the joining nip roll 200 can be supplied via the angle forming roll 300. The angle forming roll 300 is supplied to the bonding nip roll 200 side at a predetermined angle θ with respect to the direction opposite to the gravity direction G by guiding the optical film 1-4. Here, the predetermined angle may be 0 degree (see FIG. 7) or an acute angle (see FIG. 8), and the acute angle may be ± 10 degrees. Thereby, it can suppress that a foreign material adheres to the optical film 1-4 to the minimum. In addition, as described above, the acute angle may be +5 degrees to -6 degrees in order to simultaneously achieve the effect of preventing foreign matter adhesion and efficient use of the apparatus. Furthermore, in the manufacturing method of the polarizing plate which concerns on embodiment of this invention, a polarizing film can be supplied not only in a horizontal direction but in an upward diagonal direction.

On the other hand, before the optical film 1-4 is transported to the bonding nip roll 200 side, the optical film 1-4 can be subjected to an antistatic treatment in order to prevent generation of static electricity in the optical film 1-4. More specifically, in the optical film 1-4, an antistatic treatment can be applied to the protective film located on the opposite side of the bonding surface bonded to the polarizer. The static electricity prevention processing can be performed by the static electricity prevention processing unit 30, and a specific description thereof will be omitted.

The polarizing plate provided by such a manufacturing method of the polarizing plate is as shown in a partially enlarged view 1D of FIG. The polarizing plate which concerns on embodiment of this invention has the form by which the optical film 1-4 was joined to the polarizing film 1-1. Since the optical film 1-4 supplied in an inclined manner is bonded to the lower surface of the polarizing film 1-1, adhesion of foreign matters is prevented and the defect rate is reduced. At this time, the stretch axis direction of the polarizer 1-1 can be adjusted, and the bonding angle with the stretch axis direction of the optical film can be adjusted.

Furthermore, since the optical film 1-4 can be subjected to antistatic treatment, the generation of static electricity is reduced even when the polarizing plate is supplied in a laminated state, and the polarizing plate can be easily separated for use. It becomes. Specifically, as illustrated in 1D of FIG. 6, the polarizing film 1-1 includes a polarizer and a first protective layer (not illustrated) bonded to one side of the polarizer (upper side of 1D of FIG. 6). And the optical film 1-4 can be positioned or bonded to the other side of the polarizing film 1-1 (the lower side of 1D in FIG. 6). At this time, the polarizer may be a PVA (Poly Vinyl Alcohol, polyvinyl alcohol) stretched polarizer, and may mean a state in which a polarizer protective film is bonded. Here, the optical film 1-4 can play a role of protecting the other side of the polarizing film 1-1 and a role as a retardation film. In this sense, the optical film 1-4 is also referred to as a second protective layer 1-4. The optical film 1-4 (or the second protective layer) can be bonded to the polarizer 1-1 by antistatic treatment. Therefore, when the polarizing plate according to the embodiment of the present invention is separated from the stacked state into individual polarizing plates for use, the generation of static electricity with other adjacent polarizing plates is reduced. Or prevented.

Thereby, the polarizing plate according to the embodiment of the present invention includes the polarizer, the first protective layer, and the second protective layer 1-4. Here, the first protective layer is located on one side of the polarizer, and the second protective layer 1-4 is located on the other side of the polarizer. That is, the polarizer 1-1 is provided in such a form that the protective layers are positioned (adhered) on both sides of the polarizer, and the second protective layer 1-4 is bonded to the other side of the polarizer 1-1. it can. Here, a retardation may be imparted to the second protective layer 1-4, and the second protective layer 1-4 imparted with the retardation can function as a film having optical properties. .

Further, the other side of the second protective layer 1-4 (also referred to as an optical film), that is, the side opposite to the bonding surface of the second protective layer 1-4 bonded to the polarizer is subjected to antistatic treatment. When the protective film (not shown) is positioned, the generation of static electricity is reduced when the individual polarizing plates are separated from the laminate of polarizing plates for use. Here, the antistatic treatment may be an antistatic coating treatment. Further, the protective film subjected to the antistatic treatment may contain an antistatic agent.

Although the present invention has been described in detail with the exemplary embodiments, those skilled in the art will understand that various modifications to the above-described embodiments are possible without departing from the scope of the present invention. It should be. Accordingly, the scope of the present invention should not be limited to the embodiments described, but should be determined not only by the claims described below, but also by the equivalents of the claims.

DESCRIPTION OF SYMBOLS 1: Manufacturing apparatus of polarizing plate 1-1: Polarizing film 1-2: Release paper 1-3: Adhesive tape 1-4: Optical film 3: Polarizing film conveyance part 20: Optical film winding roll 22: 2nd collection | recovery Roll 24: Optical film release roll part 26a, 26b, 26c, 26d: Optical film via roll part 30: Antistatic treatment part 32: Antistatic droplet discharge part 34: Swipe part 40: Suction part 60: Release guide 200 : Joining nip roll 210: Joining first roll 220: Joining second roll 300: Angle forming roll

Claims (23)

A polarizing film transport section for transporting the polarizing film;
A joining nip roll for attaching an optical film to the polarizing film conveyed from the polarizing film conveying unit;
An apparatus for manufacturing a polarizing plate, comprising: an angle forming roll that supplies the optical film to the joining nip roll side at an angle of 0 degrees or an acute angle with respect to a direction opposite to the direction of gravity. The polarizing plate manufacturing apparatus according to claim 1, wherein the acute angle is ± 10 degrees. The said acute angle is a manufacturing apparatus of the polarizing plate of Claim 1 which is +5 degree | times --6 degree | times. The said polarizing film conveyance part is a manufacturing apparatus of the polarizing plate of Claim 1 which conveys the said polarizing film to the said joining nip roll side in a horizontal direction or an upward inclination direction. The said polarizing film conveyance part is a manufacturing apparatus of the polarizing plate of Claim 1 containing the conveyor belt in which the said polarizing film arrives and conveys, and one or several suction part. The manufacturing apparatus of the polarizing plate of Claim 1 which further contains the antistatic process part for apply | coating an antistatic liquid to the said optical film. The antistatic treatment part is
The apparatus according to claim 6, further comprising: an antistatic droplet discharge unit for discharging the antistatic droplet; and a swipe unit for swiping so that the discharged antistatic droplet is uniformly applied. The manufacturing apparatus of the polarizing plate of description. The polarizing film transported by the polarizing film transport unit is a sheet-shaped polarizing film including a polarizer and a release paper attached to one side of the polarizer, and is an adhesive for releasing the release paper. The manufacturing apparatus of the polarizing plate of Claim 1 which further contains the sticking nip roll which crimps | bonds a tape to the said release paper. Further including a release guide for guiding recovery of the pressure-bonded release paper and the adhesive tape;
The apparatus for producing a polarizing plate according to claim 8, wherein an interval between the release guide and the bonding nip roll is greater than 0 mm and equal to or less than 80 mm. The manufacturing apparatus of the polarizing plate of Claim 8 whose space | interval of the said sticking nip roll and the said joining nip roll is 200 mm or more and 600 mm or less. Transport the polarizing film to the joining nip roll side,
In the manufacturing method of the polarizing plate for attaching the optical film supplied to the bonding nip roll side to the polarizing film conveyed to the bonding nip roll,
A method for producing a polarizing plate, wherein the optical film is supplied to the joining nip roll side at an angle of 0 degrees or an acute angle with respect to a direction opposite to the direction of gravity. The said acute angle is a manufacturing method of the polarizing plate of Claim 11 which is +5 degree--6 degree. The said polarizing film is a manufacturing method of the polarizing plate of Claim 11 conveyed in the horizontal direction or the upper diagonal direction to the said joining nip roll side. The method for producing a polarizing plate according to claim 11, wherein the optical film is subjected to antistatic treatment before being supplied to the bonding nip roll side. The method for producing a polarizing plate according to claim 14, wherein the antistatic treatment is an antistatic coating treatment. The method for producing a polarizing plate according to claim 14, wherein the antistatic treatment is treatment performed on the other side surface of the optical film on the polarizing film bonding surface side. The method for producing a polarizing plate according to claim 11, wherein the polarizing film includes a first protective layer and a polarizer, and the optical film is bonded to the polarizer. The method for producing a polarizing plate according to claim 17, wherein the optical film is a retardation layer. The polarizing plate provided by the manufacturing method of the polarizing plate as described in any one of Claims 11-18. A first protective layer;
A polarizer,
A second protective layer in order,
The polarizing plate further comprising a protective film that has been subjected to antistatic treatment on the opposite side of the polarizer bonding surface of the second protective layer. The polarizing plate according to claim 20, wherein the second protective layer is a retardation layer. The polarizing plate according to claim 20, wherein the antistatic treatment is an antistatic coating treatment. The polarizing plate according to claim 20, wherein the antistatic treatment protective film contains an antistatic agent therein.

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