JP2017027036A - 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 easily releasing a polarization film release sheet stuck to a polarization film with an adhesive tape, and a polarizer.SOLUTION: The invention relates a polarization film transport part for transporting a polarization film, to whose one side a release sheet is stuck, an adhesive tape supply part for supplying an adhesive tape for releasing the release sheet, and a sticking nip roll for crimping the release sheet and the adhesive tape. According to such a polarizer production device, such a situation in which, only a part of the release sheet included in the polarizer is released, is prevented, a proportion defective of the polarizer is suppressed and production efficiency can be 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

It is an object of the present invention to provide a polarizing plate manufacturing apparatus, a polarizing plate manufacturing method, and a polarizing plate, in which a polarizing film release paper attached to a polarizing film is easily released with an adhesive tape.

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 according to the present invention releases a polarizer and a polarizing film transport unit that transports a polarizer and a sheet-like polarizing film having a release paper attached to one side of the polarizer, and the release paper. An adhesive tape supply unit that supplies an adhesive tape for the purpose, and a sticking nip roll that presses the release paper and the adhesive tape.

The polarizing film transport unit transports the release paper of the sheet-like polarizing film in a state of being attached to the lower side of the polarizer, and the adhesive tape supply unit is an adhesive for releasing the release paper. A tape can be supplied from below the polarizing film.

A release paper of the sheet-like polarizing film is attached to the lower side of the polarizer, and an adhesive tape for releasing the release paper can be supplied from the lower side of the polarizing film.

It further includes a first recovery roll for recovering the release paper, and the first recovery roll can recover the adhesive tape and the release paper pressure-bonded to the adhesive tape.

A mold release guide for guiding the collection to the first collection roll may be further included.

The adhesive tape to be attached to the release paper can be attached to a part or all of the release paper.

The adhesive tape may be a plurality of tapes having a narrower width than the release paper, or a single tape having the same or larger width as the release paper.

The adhesive tape supply unit includes an adhesive tape winding roll on which the adhesive tape is wound, and an adhesive tape through which the adhesive tape supplied from the adhesive tape winding roll passes before being supplied to the sticking nip roll. And a via roll part.

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.

The pressure-sensitive release paper and the adhesive tape are peeled off from the polarizer, and further include a release guide for guiding recovery of the peeled film, and an interval between the release guide and the joining nip roll is 0 mm. It may be more than 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.

In the method for producing a polarizing plate according to the present invention, a polarizing film including a polarizer and a release paper attached to one side of the polarizer is transported to a sticking nip roll side, and the polarizing film is transported to the sticking nip roll side. The adhesive tape supplied to the sticking nip roll side is pressure-bonded by the sticking nip roll.

The adhesive tape and the release paper pressure-bonded to the adhesive tape can be released from the polarizing film and collected together.

The recovery of the adhesive tape and the release paper can be performed by recovery to the first recovery roll after being guided by a release guide.

The adhesive tape can be the same as or larger than the release paper.

An optical film can be bonded to the polarizing film from which the release paper has been released by a bonding nip roll.

An interval between the release guide and the joining nip roll may be greater than 0 mm and equal to or less than 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.

The adhesive tape may be a plurality of tapes having a narrower width than the release paper, or a single tape having the same or larger width as the release paper.

The optical film can be subjected to antistatic treatment before being bonded to the polarizing film.

The optical film can be bonded to the side of the polarizing film from which the release paper has been peeled off.

The antistatic treatment of the optical film may be a treatment of laminating an antistatic coating layer.

The polarizing film may include a first protective layer and a polarizer.

The optical film may be a retardation layer.

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

The polarizing plate according to the present invention includes a first protective layer, a polarizer, and a second protective layer in order, and a protective film that has been subjected to antistatic treatment on the opposite side of the polarizer bonding surface of the second protective layer. Further can be 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 of the present invention, it is possible to prevent only part of the release paper that can be included in the polarizing plate from being released.

In addition, according to the present invention, it is possible to reduce the defective rate of the polarizing plate and improve the production efficiency.

Furthermore, according to the polarizing plate of the present invention, it is possible to prevent sticking due to static electricity and facilitate separation of the polarizing plate when separating the individual in the laminated state.

Furthermore, according to the present invention, it is possible to adjust the angle formed by the stretching direction of the polarizing film and the optical film or the direction showing the optical properties.

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 release paper are bonded in the polarizing plate manufacturing apparatus of FIG. FIG. 4 is a state diagram showing a state where the release paper and the adhesive tape shown in FIG. 1 are attached. FIG. 5 is a state diagram showing a state where the 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 state diagram showing a state in which an adhesive tape is attached to the release paper shown in FIG. 1 by an application nip roll. FIG. 8 is a state diagram showing a state in which a release paper is attached to the polarizing film 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 releases a release paper 1-2 with an adhesive tape 1-3 in a manufacturing process of a polarizing plate. The adhesive tape 1-3 can be pressure-bonded and affixed to the pattern paper 1-2. For this purpose, the polarizing plate manufacturing apparatus 1 can include a polarizing film transport unit 3, adhesive tape supply units 10 and 14 a, and a pasting nip roll 100.

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-shaped 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 to be recovered by the first recovery roll 12 so as to be recovered. 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. You may affix to 1-2 whole stably.

Hereinafter, a process of bonding the optical film 1-4 after releasing the release paper 1-2 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, and the size of the apparatus increases and the possibility of foreign matter adhesion increases.

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 released release paper 1-2 and the adhesive tape 1-3 bonded thereto are both guided by the release guide 60 and moved to the first collection roll 12, the release guide 60 and By shortening the interval between the bonding nip roll 200, the direction can be smoothly transported without releasing the direction when the mold release and the polarizing film 1-1 are moved to the bonding 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. The stability of the process may be impaired.

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 evenly 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. 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 can be swiped by the conveyance of the optical film 1-4. it can.

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.

In the polarizing plate manufacturing apparatus 1 according to the present invention as described above, when the polarizer 1-1 and the optical film 1-4 are transported from the polarizing film transport unit 3 to the bonding 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 polarizer 1-1 and the release paper are bonded in the polarizing plate manufacturing apparatus shown in FIG. 1, and FIG. 4 is the release paper and adhesive tape shown in FIG. FIG. 5 is a state diagram showing a state in which the release paper and the adhesive tape shown in FIG. 1 are peeled from the state where they are attached, and FIG. These are the state diagrams which show the state by which a polarizing film and an optical film are affixed.

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 to the nip roll 100 side by the polarizing film conveyance unit 3. The 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 removed from the release paper 1 by the adhesive nip roll 100. -2 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 that have been released in this way are collected by the first collection roll 12 by the guide of the release guide 60. By narrowing the distance between the release guide 60 and the joining nip roll 200 and fixing the polarizer 1-1 continuously, it is possible to prevent the occurrence of curling and deviation in direction due to shaking.

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 the optical film 1-4 is transported 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 positioned above the optical film 1-4 performs optical processing. An antistatic solution can be applied to the 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. And the 2nd collection | recovery roll 22 can collect | recover the optical film release paper released from the optical film 1-4 and the said optical film 1-4. Furthermore, the polarizing plate manufacturing apparatus 1 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, or the polarizing film in the upward oblique direction. You may supply.

FIG. 8 is a state diagram showing a state in which release paper is attached to the polarizing film shown in FIG.

As shown in FIG. 8, the adhesive tape 1-3 can be attached to a part (FIG. 8C) or all (FIGS. 8A and 8B) of the release paper 1-2. Here, when the adhesive tape 1-3 is attached to the entire release paper 1-2, the adhesive tape 1-3 is the same as the release paper 1-2 (FIG. 8A) or can be enlarged ( FIG. 8B). The adhesive tape 1-3 may be a plurality of tapes having a narrower width than the release paper 1-2, or may be a single tape having the same or larger width as the release paper 1-2. The adhesive tape 1-3 is pressure-bonded to the release paper 1-2 by the sticking nip roll 100 and then released together with the release paper 1-2 at the time of peeling. Therefore, the adhesive tape 1-3 can be provided so as to be attached to a part or all of the release paper 1-2 by the adhesive force. Further, when the adhesive tape 1-3 is attached to the entire release paper 1-2, is the adhesive tape 1-3 attached to the release paper 1-2 with the same size as the release paper 1-2 (FIG. 8A)? Further, it may be formed larger than the release paper 1-2 for stable sticking (FIG. 8B).

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.

The manufacturing method of the polarizing plate which concerns on other embodiment of this invention conveys the polarizing films 1-1 and 1-2 with which the release paper 1-2 was affixed on the one side to the sticking nip roll 100 side (S1). The adhesive tape 1-3 supplied to the sticking nip roll 100 side is pressure bonded to the polarizing films 1-1 and 1-2 conveyed to the sticking nip roll 100 (S2). The pressure bonding (S3) between the polarizing films 1-1 and 1-2 and the adhesive tape 1-3 is performed by the sticking nip roll 100. That is, the polarizing films 1-1 and 1-2 and the adhesive tape 1-3 are supplied between the rolls included in the sticking nip roll 100, and the polarizing films 1-1 and 1-2 and the adhesive tape 1- 3 can be pasted. Thereby, the adhesive tape 1-3 is adhered to the release paper 1-2 of the polarizing films 1-1 and 1-2.

Next, the adhesive tape 1-3 and the release paper 1-2 that is pressure-bonded to the adhesive tape 1-3 are released from the polarizer 1-1 and collected together (S3 and S4). As a result, it is possible to prevent the release paper 1-2 from being partially released from the polarizer 1-1 or the occurrence of curling or distortion in the polarizer 1-1 during the release process. From these things, the defect rate of a polarizing plate can be reduced.

Here, the recovery of the adhesive tape 1-3 and the release paper 1-2 (S3, S4) is performed by releasing the adhesive tape 1-3 and the release paper 1-2 that are released from the polarizer 1-1 together. After being guided (S3) by the mold release guide 60, it is performed by being wound around the first collection roll 12.

Here, the adhesive tape 1-3 can be the same as or larger than the release paper 1-2, whereby the recovery of the adhesive tape 1-3 and the release paper 1-2 (S3, S4) is more efficient and It can be done reliably.

On the other hand, the optical film 1-4 can be bonded (S5) to the polarizing film from which the release paper 1-2 is released by the adhesive tape 1-3 by the bonding nip roll 200. The optical film 1-4 can be supplied to the joining nip roll 200 side at an angle of 0 degrees or an acute angle with respect to the direction opposite to the direction of gravity. A predetermined angle θ with respect to the direction opposite to the gravity direction G can be formed and supplied to the joining nip roll 200 side. 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. 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 according to the embodiment of the present invention has a form in which an optical film 1-4 is bonded to a polarizer 1-1. Since the optical film 1-4 is bonded to the lower surface of the polarizer 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 polarizer 1-1 includes a polarizer and a first protective layer (not shown) bonded to one side of the polarizer (upper side of 1D of FIG. 6). The optical film 1-4 can be positioned or adhered to the other side of the polarizer 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 polarizer 1-1 and a phase difference 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. Accordingly, the polarizing plate according to the embodiment of the present invention reduces the generation of static electricity with other polarizing plates stacked adjacent to each other when separated from the stacked state into individual polarizing plates for use. Or it can be prevented.

Thereby, the polarizing plate which concerns on embodiment of this invention contains a polarizer, a 1st protective layer, and the 2nd protective layer 1-4 in order. That is, the polarizer 1-1 is provided in a form in which 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 10 Adhesive tape winding roll 12 First collection | recovery roll 14 Roll part 40 via adhesive tape Suction unit 60 Release guide 100 Sticking nip roll 200 Joining nip roll 300 Angle forming roll

Claims (28)

A polarizing film transport unit that transports a polarizer and a sheet-like polarizing film having a release paper attached to one side of the polarizer;
An adhesive tape supply unit for supplying an adhesive tape for releasing the release paper;
The manufacturing apparatus of a polarizing plate containing the sticking nip roll which crimps | bonds the said release paper and the said adhesive tape. The polarizing film transport unit transports the release sheet of the sheet-like polarizing film in a state of being attached to the lower side of the polarizer,
The said adhesive tape supply part is a manufacturing apparatus of the polarizing plate of Claim 1 which supplies the adhesive tape for releasing the said release paper from the lower side of the said polarizing film. A first collecting roll for collecting the release paper;
The said 1st collection | recovery roll is a manufacturing apparatus of the polarizing plate of Claim 1 which collect | recovers the said adhesive tape and the said release paper crimped | bonded to this adhesive tape. The manufacturing apparatus of the polarizing plate of Claim 3 which further contains the mold release guide which guides the collection | recovery to the said 1st collection | recovery roll. The adhesive tape to be attached to the release paper is
The manufacturing apparatus of the polarizing plate of Claim 1 which can be affixed on one part or all part of the said release paper. 6. The polarizing plate manufacturing apparatus according to claim 5, wherein the adhesive tape is a plurality of tapes having a narrow width, or a single tape having a width equal to or larger than the release paper. The adhesive tape supply unit
An adhesive tape winding roll on which the adhesive tape is wound;
The manufacturing apparatus of the polarizing plate of Claim 1 with which the adhesive tape supplied from this adhesive tape winding roll contains the adhesive tape via roll part which passes before it supplies to the said sticking nip roll. 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 contains one or several suction part. A release guide for guiding recovery of the pressure-bonded release paper and the adhesive tape, and a joining nip roll for joining the polarizer and the optical film from which the release paper has been released;
The manufacturing apparatus of the polarizing plate of Claim 1 whose space | interval of the said mold release guide and the said joining nip roll is 0 mm and 80 mm or less. The manufacturing apparatus of the polarizing plate of Claim 9 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. Transporting a polarizing film including a polarizer and a release paper attached to one side of the polarizer to the nip roll side,
The manufacturing method of a polarizing plate which press-bonds the adhesive tape supplied to the said sticking nip roll side to the polarizing film conveyed to the said sticking nip roll side with the said sticking nip roll. The method for producing a polarizing plate according to claim 11, wherein the adhesive tape and the release paper pressure-bonded to the adhesive tape are released from the polarizing film and collected together. The method for manufacturing a polarizing plate according to claim 12, wherein the recovery of the adhesive tape and the release paper is performed by recovery to the first recovery roll after being guided by a release guide. The method for producing a polarizing plate according to claim 11, wherein the adhesive tape is the same as or larger than the release paper. The method for producing a polarizing plate according to claim 12, wherein an optical film is bonded to the polarizing film from which the release paper has been released by a bonding nip roll. The manufacturing method of the polarizing plate of Claim 15 whose space | interval of the said mold release guide and the said joining nip roll is 0 mm and 80 mm or less. The manufacturing method of the polarizing plate of Claim 15 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. The manufacturing method of the polarizing plate according to claim 11, wherein the adhesive tape is a plurality of tapes having a narrower width than the release paper, or a single tape having the same or larger width as the release paper. Method. The method for producing a polarizing plate according to claim 15, wherein the optical film is subjected to antistatic treatment before being bonded to the polarizing film. The manufacturing method of the polarizing plate of Claim 15 which joins the said optical film to the side by which the release paper of the said polarizing film was peeled. The method for manufacturing a polarizing plate according to claim 19, wherein the antistatic treatment is an antistatic coating treatment. The said polarizing film is a manufacturing method of the polarizing plate of Claim 11 containing a 1st protective layer and a polarizer. The method for producing a polarizing plate according to claim 15, wherein the optical film is a retardation layer. The polarizing plate manufactured by the manufacturing method of the polarizing plate as described in any one of Claims 11-23. 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 25, wherein the second protective layer is a retardation layer. The polarizing plate according to claim 25, wherein the antistatic treatment is an antistatic coating treatment. The polarizing plate according to claim 25, wherein the antistatic treatment-treated protective film contains an antistatic agent therein.

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