WO2017169926A1

WO2017169926A1 - Separation method

Info

Publication number: WO2017169926A1
Application number: PCT/JP2017/011002
Authority: WO
Inventors: 阿部　浩幸; 大悟鈴木; 宜弘中村; 曜彰大沢
Original assignee: 日東電工株式会社
Priority date: 2016-03-30
Filing date: 2017-03-17
Publication date: 2017-10-05
Also published as: KR102391882B1; TW201736884A; CN107924018A; TWI726077B; CN107924018B; JP6276797B2; KR20180128887A; JP2017181784A

Abstract

Provided is a separation method for separating a first optical film from a laminate having a substrate and the first optical film adhered on one face of the substrate, wherein the first optical film has an optical axis, a second optical film having an optical axis is adhered to the outer face of the first optical film opposite the substrate such that the optical axis of the first optical film and the optical axis of the second optical film intersect, and the first optical film is separated together with the second optical film.

Description

Peeling method

Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2016-068909 filed on Mar. 30, 2016, the contents of which are incorporated herein by reference.

The present invention relates to a peeling method for peeling an optical film from a laminate.

Conventionally, a liquid crystal display panel, an organic EL display panel, and the like are known as panels applied to an image display unit of an image display device. These panels include a substrate formed of a hard glass plate or the like, and an optical film having an optical axis such as a polarizing plate bonded to one or both surfaces of the substrate via an adhesive. A laminate is used.

This type of laminate is manufactured by adhering an optical film to a substrate and is inspected after manufacture. Thus, the optical film bonded to the substrate is usually formed smaller than the substrate. In the above inspection, there may be a case where a defect such as contamination or breakage of the bonded optical film, mixing of air or foreign matter between the polarizing plate and the substrate is discovered. In this case, an optical film is peeled off from a liquid crystal display panel or the like to reuse the obtained substrate for manufacturing another liquid crystal display panel or the like. Such peeling of the optical film is generally called rework.

By the way, when the optical film is peeled from the laminate as described above, the optical film may be torn (broken) at the time of peeling, and a part of the optical film may remain on the substrate. Here, as is generally well-known, the optical film bonded to the substrate is not originally intended to be peeled off, and the substrate with a strong adhesive force so that it is not easily peeled off. It is glued to. For this reason, when it is going to peel an optical film from a board | substrate, a great force will be applied to an optical film and an optical film will be torn according to how this force is applied. In recent years, the thickness of optical films has been particularly reduced, and optical films are more easily torn.

Then, the method of peeling this film from a laminated body is suppressed, suppressing the fracture | rupture of a film.
For example, a peeling method for peeling an optical film from a laminate that is an electro-optic panel formed by bonding an optical film to a substrate, wherein the surface of the substrate from which the optical film has been peeled is pressed with a substrate pressing blade, There has been proposed a peeling method in which an optical film is peeled by vibrating the laminated body while pressing the laminated body with a film pressing roller. According to this peeling method, it becomes possible to suppress the breakage of the optical film (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2009-29561

However, even if the optical film is peeled off by pressing the substrate with a substrate pressing blade as in the peeling method described in Patent Document 1 and vibrating the laminated body while holding the laminated body with a film pressing roller, the optical film still remains. May break.

In view of the above circumstances, an object of the present invention is to provide a peeling method capable of easily peeling an optical film from a substrate while suppressing the tearing of the optical film.

In order to solve the above-mentioned problems, the present inventors diligently researched and found that the optical film may be broken even if the optical film is peeled off using the pressing member as described above.
In order to suppress this breakage, the present inventors diligently studied the application of a reinforcing film. As a result, when the second optical film having the optical axis is bonded to the first optical film having the optical axis laminated on the substrate, the second optical film is not bonded. The first optical film was found to be difficult to break. Further, when the second optical film having the optical axis is bonded to the first optical film having the optical axis laminated on the substrate so that the optical axes intersect with each other, these optical axes are used. It has been found that the first optical film is less likely to break when the first optical film is peeled from the substrate together with the second optical film than when the two are bonded in parallel.
Here, if the point which reinforces the 1st optical film to peel is considered, it is desirable to adhere | attach the 2nd optical film of the same magnitude | size as this as a film for reinforcement. However, if cutting is performed to form a second optical film having the same size as the first optical film, chips may be generated, and it is troublesome to remove the chips. In addition, it takes time and effort, leading to the generation of discarded parts, which is not desirable in terms of cost.
Therefore, the present inventors have conducted further research, and as a set of polarizing plates used in an optical display device, are optical films originally used in a set, each having an adhesive layer on each surface side. By diverting one of the optical films as a reinforcing film (second optical film) when peeling (reworking) the first optical film, a second optical film having the same size is produced. Therefore, it has been found that it is possible to reduce the cost and the labor of cutting. Moreover, when diverting in this way, as described above, for example, when using a polarizing plate (polarizing plate in which the extending directions of the optical axes are parallel) corresponding to the polarizing plate to be peeled (parallel Nicol), When using a polarizing plate corresponding to the polarizing plate to be peeled off (crossed nicols) corresponding to the polarizing plate (extending directions of the optical axes are orthogonal to each other), it is more difficult to break during peeling. I found it.
And based on these knowledge, it came to complete this invention.

That is, the present invention
A peeling method for peeling the first optical film from a laminate comprising a substrate and a first optical film bonded on one surface of the substrate,
The first optical film has an optical axis;
A second optical film having an optical axis on the outer surface of the first optical film opposite to the substrate is crossed between the optical axis of the first optical film and the optical axis of the second optical film. Glue to
It is a peeling method which peels a said 1st optical film with a said 2nd optical film.

In the peeling method of the above configuration,
The first and second optical films are rectangular,
The second optical film has the same size as the first optical film as viewed in the thickness direction, and each corner of the second optical film and each corner of the first optical film, Are configured such that the optical axis of the second optical film intersects the optical axis of the first optical film when the second optical film and the first optical film are overlapped with each other so as to match each other. It is preferable that

In the peeling method of the above configuration,
The second optical film is adhered to a surface of the substrate opposite to the first optical film, and is used for constituting an optical display device together with the substrate and the first optical film. It is preferable that it is the same film.

In the peeling method of the above configuration,
It is preferable that the first and second optical films are polarizing plates.

In the peeling method of the above configuration,
The second optical film is placed on the first optical film such that the optical axis of the first optical film and the optical axis of the second optical film intersect at an angle of 89.0 to 91.0 °. It is preferable to adhere to a film.

In the peeling method configured as described above, it is preferable that the second optical film is a defective product.

As described above, according to the present invention, there is provided a peeling method capable of easily peeling an optical film from a substrate while suppressing the optical film from being torn.

The schematic top view which shows the laminated body to which the peeling method of this embodiment is applied Schematic side view showing an example of the layer structure of the laminate of FIG. The schematic side view which shows an example of the layer structure of a 1st optical film among the laminated bodies of FIG. Schematic side view showing an example of the layer configuration of the second optical film Schematic top view showing an example of a state in which the second optical film is bonded to the first optical film Schematic top view showing an example of a state in which the second optical film is bonded to the first optical film Schematic side view showing an example of a state in which the second optical film is bonded to the first optical film The schematic top view which shows the state by which the 1st optical film peeled from the peeling starting point was wound around the peeling apparatus used for the peeling method of this embodiment. The schematic side view which shows the state by which the 1st optical film peeled from the peeling start point was wound around the peeling apparatus used for the peeling method of this embodiment. Schematic side view showing a state in which the peeled first optical film is sequentially wound while the first optical film is further peeled by the rotation of the winding member Schematic side view showing a state in which all of the first optical film is peeled off by rotation of the winding member Schematic top view showing a state where the second optical film is bonded to the first optical film in Comparative Example 1

Hereinafter, a peeling method according to an embodiment of the present invention will be described with reference to the drawings.

First, the laminated body from which the 1st optical film is peeled in the peeling method of this embodiment is demonstrated.
As shown in FIGS. 1 and 2, the stacked body 30 includes a rectangular substrate 31 and a first optical film 33 bonded on one surface 31 a of the substrate 31.

The substrate 31 is one on which the first optical film 33 is laminated, and is larger than the first optical film 33.
Examples of the substrate 31 include hard glass.

The first optical film 33 is a film having an optical axis.
The first optical film 33 is not particularly limited as long as it is an optical film having an optical axis.
The first optical film 33 has four

end edges

34a, 34b, 34c, 34d, and intersections of these end edges constitute four

corner portions

35a, 35b, 35c, 35d.
The extending direction of the optical axis of the first optical film 33 is not particularly limited. For example, as shown in FIG. 1, a mode in which the optical axis extends in parallel with one end edge 34 (here, the

end edge

34b or 34d) of the first optical film 33 may be employed.
Here, that the optical axis of the first optical film 33 extends in parallel with the one edge 34 of the first optical film 33 means that it extends completely in parallel with the one edge 34. A case where the crossing angle is 0 °, and a case where the crossing angle is within ± 1.0 °, preferably ± 0.3 °.

The first optical film 33 is bonded onto the upper surface 31a of the substrate 31 with a first adhesive (not shown).

The thickness of the first optical film 33 is not particularly limited and can be set as appropriate. However, for example, the smaller the thickness of the first optical film 33, the lower the strength tends to be, and the easier it is torn. On the other hand, the larger the thickness, the higher the strength, and the more difficult it is to tear. Therefore, for example, when the thickness of the first optical film 33 is 200 μm or less, preferably 90 μm or less, more preferably 50 μm or less, the peeling method of this embodiment can be preferably applied. Thus, even if the thickness is relatively small, the first optical film 33 can be reinforced to make it difficult to tear the first optical film 33 at the time of peeling. This is because it becomes more useful.

Examples of the first optical film 33 include a polarizing plate, a retardation film, and a brightness enhancement film.

When the first optical film 33 is, for example, a polarizing plate 33, as shown in FIG. 3, specifically, the polarizing plate 33 is, for example, a polarizer 41 and a first film formed on both surfaces of the polarizer 41, respectively. 2 adhesive layers 43 having two adhesives, and two protective films 45 respectively laminated on the two adhesive layers 43.
In this way, in the embodiment shown in FIG. 3, the polarizing plate 33 has an embodiment including the polarizer 41 and the protective film 45 laminated on both surfaces thereof. In addition, the polarizing plate 33 includes the polarizer 41. And the aspect which has the protective film 45 laminated | stacked only on the one surface may also be employ | adopted.

Examples of the polarizer 41 include those formed by dyeing and stretching a polyvinyl alcohol film.
The thickness of the polarizer 41 is usually about 2 to 30 μm.

Examples of the first and second adhesives include conventionally known adhesives.

As the protective film 45, cellulose resin such as triacetyl cellulose, polyester resin, polyethersulfone resin, polysulfone resin, polycarbonate resin, polyamide resin, polyimide resin, polyolefin resin, (meth) acrylic resin, cyclic polyolefin resin (norbornene resin) And a film formed of one or more selected from the group consisting of polyarylate resin, polystyrene resin, polyvinyl alcohol resin, and mixtures thereof.

The thickness of the protective film 45 as described above is usually about 20 to 60 μm.

In the laminate 30 used in the peeling method of the present embodiment, as described above, the first optical film 33 is bonded onto the upper surface 31a of the substrate 31 with the first adhesive. The adhesive force of the first optical film 33 to the substrate 31 (that is, the adhesive force of the first adhesive) is usually 5 to 15 N / 25 mm. With such an adhesive force, the first optical film 33 can be relatively firmly bonded to the substrate 31. Further, even when the first optical film 33 firmly bonded in this way is peeled off, the tearing of the first optical film 33 can be suppressed. Therefore, the peeling method of this embodiment is suitable for the laminated body 30 which has the board | substrate 31 and the 1st optical film 33 which were adhere | attached with the adhesive force of the said range.
The adhesive force is a value measured when the first optical film 33 is peeled off from the substrate 31 in the 90 ° direction at a tensile speed of 300 mm / min by an autograph (precision universal testing machine, manufactured by Shimadzu Corporation). is there.

Next, the second optical film 51 bonded to the first optical film 33 in this embodiment will be described.

The second optical film 51 is a film having an optical axis.
The second optical film 51 is not particularly limited as long as it is an optical film having an optical axis.
As shown in FIG. 5, the second optical film 51 has four

end edges

52a, 52b, 52c, and 52d, and the intersection of these end edges has four

corners

53a, 53b, 53c, and 53d. Is configured.
The extending direction of the optical axis of the second optical film 51 is not particularly limited. For example, as shown in FIG. 5, the optical axis extends parallel to one end edge 52 (here 52a or 52c) of the second optical film 51 (perpendicular to the

end edge

52b or 52d). Embodiments can be employed.
Here, the optical axis of the second optical film 51 being parallel to the one edge 52 of the second optical film 51 means that the optical axis of the second optical film 51 extends completely parallel to the one edge. (Crossing angle is 0 °) and the case where the crossing angle extends within ± 1.0 °, preferably within ± 0.3 ° is included.

The second optical film 51 is bonded to the outer surface 33a of the first optical film 33 so that the optical axis of the first optical film 33 and the optical axis of the second optical film 51 intersect.

Examples of the second optical film 51 include the same ones as the first optical film 33. That is, examples of the second optical film 51 include a polarizing plate, a retardation film, and a brightness enhancement film.

The thickness of the second optical film 51 is not particularly limited and can be set as appropriate.

The second optical film 51 may be a film formed of the same material as that of the first optical film 33 or may be a film of a different type.

When the second optical film 51 is a polarizing plate 51, the same configuration as that of the polarizing plate 33 (see FIG. 3) can be adopted. For example, as shown in FIG. , A polarizer 61, two adhesive layers 63 having a third adhesive formed on both surfaces of the polarizer 61, and two protective films respectively laminated on the two adhesive layers 63 65.
As described above, in the embodiment illustrated in FIG. 4, the polarizing plate 51 has an embodiment including the polarizer 61 and the protective film 65 laminated on both surfaces thereof. In addition, the polarizing plate 51 includes the polarizer 61. And the aspect which has the protective film 65 laminated | stacked only on the one surface may also be employ | adopted.

Examples of the polarizer 61 and the protective film 65 include those having the same material and thickness as the polarizer 41 and the protective film 45 described above.

The first and second

optical films

31 and 51 are formed in a rectangular shape.
The second optical film 51 has the same size as the first optical film 33 in the thickness direction, and the first corners 35a to 35d and the corners 53a to 53d of the second optical film 51 are the same. When the second optical film 51 is overlapped with the first optical film 33 so that 53d and the corners of the first optical film 33 and the second optical film 51 coincide with each other, The optical axis of the second optical film 51 is configured to intersect the optical axis of the first optical film 33.

Here, the second optical film 51 has the same size as the first optical film 33 as viewed in the thickness direction. The length of each edge 52a to 52d of the second optical film 51 is the first The length of each of the edges 34a to 34d of the optical film 33 is equal to or longer than the length of each of the edges 34a to 34d of the first optical film 33 by less than the thickness of the first optical film 33. means.

As described above, since the second optical film 51 has the same size as the first optical film 33, the second optical film 51 covers the entire surface of the first optical film 33 so that the second optical film 51 exactly covers the second optical film 51. The optical film 51 can be adhered to the first optical film 33. Thereby, the whole of the first optical film 33 can be sufficiently reinforced by the second optical film 51.
Further, when the second optical film 51 is overlapped with the first optical film 33 so that the respective corners (the respective corners 35a to 35d and the respective corners 53a to 53d) coincide with each other, By being configured so that the optical axis of the optical film 51 intersects with the optical axis of the first optical film 33, the first optical film 33 and the second optical film 51 are simply overlapped, The optical axis of the first optical film 33 and the optical axis of the second optical film 51 can be crossed.
Therefore, the peeling operation becomes more efficient.

Here, as shown in FIG. 1, the substrate 31 is usually formed larger than the first optical film 33. For this reason, when the end edges 52a to 52d of the second optical film 51 protrude outside the end edges 34a to 34d of the first optical film 33, the second optical film 51 becomes the first adhesive. There is a possibility that a problem may occur that the first optical film 33 is prevented from being peeled off from the substrate 31 by this adhesion. In general, the first optical film 33 is cut and formed to have a predetermined shape, and microscopically, portions that are not aligned with the end edges 34a to 34d (for example, jagged) Part). For this reason, if the end edges 52a to 52d of the second optical film 51 are retracted inward from the end edge of the first optical film 33, there is a problem in that tearing occurs starting from this non-straight line portion. May occur.

However, as described above, since the second optical film 51 has the same size as the first optical film 33, the respective edges 34a to 34d of the first optical film 33 and the second optical film 51 The second optical film 51 can be bonded to the outer surface 33a of the first optical film 33 so that the end edges 52a to 52d are flush with each other. As a result, it is possible to suppress the occurrence of the problem caused by the protrusion of the second optical film 51 as described above and the problem caused by the retraction, so that the first optical film 33 is more reliably prevented from tearing. Meanwhile, the first optical film 33 can be peeled from the substrate 31.
As described above, the end edges 52a to 52d of the second optical film 51 are outside the end edges 34a to 34d of the first optical film 33 and have a length less than the thickness of the first optical film 33. It may be protruding. In this case, the second optical film 51 is not adhered to the substrate 31 and the first optical film 33 is attached to the substrate while more reliably suppressing the first optical film 33 from being torn, as described above. It becomes possible to peel from 31.

The second optical film 51 having the same size as the first optical film 33 is adhered to the outer surface of the substrate 31 opposite to the first optical film 33, so that the substrate 31 and the first optical film 33 are bonded. The same film as the film used for constituting the optical display device together with the optical film 33 is preferable. That is, the second optical film 51 having the same size as the first optical film 33 is adhered to the outer surface of the substrate 31 on the side opposite to the first optical film 33, so that the substrate 31 and the first optical film are bonded. It is preferable to use a film that is used together with 33 to constitute an optical display device.
According to such a configuration, one set of optical films that are originally used so as to be laminated with their optical axes crossing each other, and one optical film having the same size is used as the second optical film 51 as it is. it can. Moreover, since it is already formed in the same size as the first optical film 33, the second optical film 51 can be exactly overlapped with the first optical film 33 without being cut or the like. Therefore, it is more efficient.
Further, the second optical film 51 having the same size as the first optical film 33 is adhered to the outer surface of the substrate 31 on the side opposite to the first optical film 33, so that the substrate 31 and the first optical film 33 are bonded. It is preferable to divert the film used for constituting the optical display device together with the one optical film 33.

In the present embodiment, the second optical film 51 is preferably a defective product.
Here, the defective product is an optical film that is bonded to the other surface of the substrate 31 (the outer surface opposite to the first optical film 33), and is a product together with the substrate 31 and the first optical film 33. What is supposed to be an (optical display device) means a device that is out of specification as a result of optical inspection or visual inspection.

Since the second optical film 51 is an inferior inspection product, it is possible to use what is originally discarded, which is more efficient.

The second optical film 51 is a defective product as described above, and a fourth adhesive similar to the first adhesive is applied to the surface to be bonded to the first optical film 33. It is preferable to have a defective product.
Thus, when the second optical film 51 is a defective product having the fourth adhesive, the fourth optical film 51 is bothered when the second optical film 51 is bonded to the first optical film 33. Saves time and effort to apply adhesive.

Further, as described above, the second optical film 51 has the same size as the first optical film 33 in the thickness direction, and each of the first corners 35a to 35d and the second optical film. The second optical film 51 is placed in the first optical film 51 so that the respective corners 53a to 53d of the 51 coincide with each other (that is, the respective corners of the first optical film 33 and the second optical film 51 match each other). When superposed on the film 33, the optical axis of the second optical film 51 is configured to intersect with the optical axis of the first optical film 33. More preferably.

As described above, by using a defective product as the second optical film 51 having the same size as the first optical film 33, the first optical film 33 is not cut to the same size as the first optical film 33. Since the second optical film 51 can be used, it is more efficient.

Next, the peeling method of this embodiment using the above-described second optical film 51 will be described.

The peeling method of this embodiment is
A peeling method for peeling the first optical film 33 from a laminate 30 comprising a substrate 31 and a first optical film 33 adhered on one surface 31a of the substrate 31,
The first optical film 33 has an optical axis,
A second optical film 51 having an optical axis is formed on the outer surface 33a of the first optical film 33 opposite to the substrate 31, and the optical axis of the first optical film 33 and the second optical film. Adhere so that the optical axis of
In this method, the first optical film 33 is peeled off together with the second optical film 51.

In the present embodiment, as shown in FIGS. 5, 6, and 7, the second optical film 51 is disposed on the outer surface 33 a of the first optical film 33 of the laminate 30, and the optical axis of the first optical film 33 is used. Is bonded as a reinforcing film so that the optical axis of the second optical film 51 intersects. 5 and 6, the extending direction of the optical axis of the first optical film 33 is indicated by a one-dot chain line, and the extending direction of the optical axis of the second optical film 51 is indicated by a two-dot chain line. Moreover, in FIG. 6, the peeling direction X is shown by the white arrow.
For example, in the present embodiment, the second optical film 51 is bonded to the outer surface 33a of the first optical film 33 by a fourth adhesive (not shown) so that both optical axes intersect.
As a 4th adhesive agent, a conventionally well-known adhesive agent is mentioned similarly to a 1st adhesive agent.

The crossing angle of the optical axis of the second optical film 51 with respect to the optical axis of the first optical film 33 when the second optical film 51 is bonded to the first optical film 33 is not particularly limited. . For example, the crossing angle is preferably 89.0 to 91.0 °, and more preferably 89.7 to 91.3 °. 5 and 6 show an embodiment in which the intersection angle of both optical axes is 90.0 °.

After the second optical film 51 is bonded to the first optical film 33, for example, as shown in FIG. 6, the second optical film 51 has one corner 35 a as the peeling start point P as shown in FIG. 6. At the same time, the first optical film 33 is peeled off.
As shown in FIGS. 5 and 6, the first optical film 33 having an optical axis parallel to one edge 34 (here 34b or 34d) is formed on one edge 52 (here 52a or 52c). When the second optical film 51 having an optical axis that is parallel (perpendicular to the

edge

52b or 52d) is bonded so that both optical axes intersect, the one corner 35a can be the peeling start point P.

In this embodiment, for example, the first optical film 33 is peeled off together with the second optical film 51 using the peeling device 1.

A preferred peeling apparatus 1 used in the peeling method of the present embodiment will be described with reference to FIGS. 8 to 11 show a mode in which the first optical film 33 to which the second optical film 51 is bonded is peeled off from the substrate 31 as shown in FIG.

As shown in FIGS. 8 and 9, the peeling apparatus 1 of the present embodiment is peeled off from the stage member 3 on which the laminated body 30 is placed, the roller-like peeling auxiliary member 7, and the laminated body 30, and peeling aid The corner part 35a of the 1st optical film 33 peeled with the member 7 is hold | maintained with the 2nd optical film 51, and the peeling member 5 which peels the 1st optical film 33 further one by one is provided.
More specifically, the peeling device 1 of this embodiment includes a winding member 5 as the peeling member 5. The winding member 5 is peeled off from the laminated body 30 and curved by the peeling assisting member 7, and the corner portion 35 a of the first optical film 33 is overlapped with the second optical film 51. When the winding member 5 rotates, the first optical film 33 is further wound along with the second optical film 51, and the first optical film 33 is sequentially wound.

The stage member 3 is a stage on which the laminate 30 is placed until all the first optical films 33 are peeled from the laminate 30.

The peeling assisting member 7 is for peeling the first optical film 33 from the substrate 31 and guiding the peeled first optical film 33 together with the second optical film 51 to the rear end side. . An example of the peeling assisting member 7 is a roller body.

In the peeling member 5, the corner portion 35 a of the peeled first optical film 33 is wound together with the second optical film 51 overlapping therewith, and the first optical film 33 is rotated by rotating in this state. Are sequentially wound together with the second optical film 51 while further peeling.
Examples of such a peeling member 5 include a roller that rotates by being driven by a driving device 17 such as a motor.
In addition, the corner portion 35a of the peeled first optical film 33 is fixed to the peeling member 5 together with the second optical film 51 overlapping therewith by an adhesive tape (not shown) or the like. It has become.
In FIG. 8, the first optical film 33 is peeled from the substrate 31 together with the first adhesive (not shown).

In the present embodiment, the peeling device 1 is used to peel the corner portion 35a of the first optical film 33 from the laminated body 30 together with the second optical film 51, and this peeled portion is removed by the peeling member 7. It is guided to the rear end side while being curved, and is wound around the peeling member 5. By rotating the peeling member 5 in this state, the first optical film 33 and the second optical film 51 are sequentially peeled from the substrate 31 and wound up.

Separation of the corners 35a of the first optical film 33 from the laminate 30 is performed as follows, for example. That is, a peeling knife (not shown) having a blade portion at the tip is grasped by an operator's finger, and the peeling knife is placed between the substrate 31 of the laminate 30 and the corner portion 35a of the first optical film 33. By inserting, the corner portion 35a of the first optical film 33 is peeled off. More specifically, the peeling knife is inserted between the first adhesive (not shown) bonded to the substrate 33 side surface 33b of the first optical film 33 and the substrate 31, and the above The first optical film 33 is peeled off together with the first adhesive.

Further, the corner portion 35a of the peeled first optical film 33 is wound around the peeling member 5 together with the second optical film 51, for example, as follows. That is, the corner portion 35a of the peeled first optical film 33 is wound around the peripheral surface of the peeling member 5 and fixed to the peripheral surface with an adhesive tape (not shown) or the like. Is done.

Then, from the state shown in FIG. 9, when the first optical film 33 is sequentially wound up by the peeling member 5 while further peeling, the peeling of the first optical film 33 progresses as shown in FIGS. 10 and 11. As described above, the stacked body 30 sequentially moves in the direction opposite to the peeling direction X (see white arrows in FIGS. 10 and 11). That is, the first optical film 30 moves relative to the stage member 3. More specifically, the laminate 30 slides on the stage member 3. As shown in FIG. 11, when all the first optical films 33 are finally peeled and the substrate 31 is completely exposed, the stacked body 30 stops moving.
In this way, the first optical film 33 is peeled off from the laminate 30 together with the second optical film 51.

In the peeling method of the present embodiment, the direction in which the first optical film 33 is peeled from the one angle 35a is not particularly limited as long as the first optical film 33 can be peeled off. Can be set.
For example, when considering the viewpoint of ease of peeling of the first optical film 33, as shown in FIGS. 6 and 9, from the one corner 35 a toward the corner 35 c positioned diagonally. It is preferable to peel off the first optical film 33.
As described above, the first optical film 33 is peeled from the one corner portion 35a toward the opposite corner portion 35c, thereby further exerting the reinforcing effect of the second optical film 51. The first optical film 33 can be peeled off.

As described above, the peeling method of this embodiment is
A peeling method for peeling the first optical film 33 from a laminate 30 comprising a substrate 31 and a first optical film 33 adhered on one surface 31a of the substrate 31,
The first optical film 33 has an optical axis,
A second optical film 51 having an optical axis is formed on the outer surface 33a of the first optical film 33 opposite to the substrate 31, and the optical axis of the first optical film 33 and the second optical film. Adhere so that the optical axis of
In this method, the first optical film 33 is peeled off together with the second optical film 51.

According to such a configuration, the first optical film 33 is bonded together with the second optical film 51 to the substrate by adhering the second optical film 51 onto the first optical film 33 so that the optical axes thereof intersect each other. When it peels from 31, the 1st optical film 33 becomes difficult to fracture | rupture.
The reason is presumed as follows. That is, in an optical film having an optical axis, the film is oriented and directionality occurs, and it is easy to tear in a direction parallel to the orientation direction and difficult to tear in an orthogonal direction. From this, by adhering the optical films so that the optical axes intersect each other, the direction in which one optical film is difficult to break and the direction in which the other optical film is difficult to break intersect. As a result, it is speculated that the first optical film 33 is not easily broken by the two laminated optical films reinforcing each other.
Therefore, according to the above configuration, it is possible to easily peel the first optical film 33 from the substrate 31 while suppressing the first optical film 33 from being torn.

In the peeling method of this embodiment,
The first and second

optical films

31, 51 are rectangular,
The second optical film 51 has the same size as the first optical film 33 in the thickness direction, and each corner 53a to 53d of the second optical film 51 and each of the first optical film 33 The second optical film 33 is overlapped with the first optical film 33 so that the corners 35a to 35d coincide with each other (corresponding corners of the first and second optical films 33 and 51). In some cases, the optical axis of the second optical film 51 is preferably configured to intersect the optical axis of the first optical film 33.

According to this configuration, since the second optical film 51 is the same size as the first optical film 33, the second optical film 51 covers the entire surface of the first optical film 33 so that it is exactly covered. The second optical film 51 can be bonded to the first optical film 33. Thereby, the whole of the first optical film 33 can be sufficiently reinforced by the second optical film 51.
Further, when the first optical film 33 is overlaid so that the corresponding corners (the corners 35a to 35d and the corners 53a to 53d) coincide with each other, the optical properties of the second optical film 51 are increased. Since the axis is configured to intersect with the optical axis of the first optical film 33, the first optical film 33 and the second optical film 51 are simply overlapped with each other. The optical axis of 33 and the optical axis of the second optical film 51 can be crossed.
Therefore, the peeling operation becomes more efficient.

In the peeling method of this embodiment,
The second optical film 51 is bonded to the surface of the substrate 31 opposite to the first optical film 33, and is used to construct an optical display device together with the substrate 31 and the first optical film 33. It is preferable that it is the same film as a film.

According to such a configuration, one set of optical films that are originally used so as to be laminated with their optical axes crossing each other, and one optical film having the same size is used as the second optical film 51 as it is. it can. Moreover, since it is already formed in the same size as the first optical film 33, the second optical film 51 can be exactly overlapped with the first optical film 33 without being cut or the like. Therefore, it is more efficient.

In the peeling method of this embodiment,
The first and second

optical films

33 and 51 are preferably polarizing

plates

33 and 51.

According to such a configuration, one of the optical films used in a set so that the optical axes are originally stacked so as to cross each other can be used as the second optical film 51 as it is, which is more efficient. .

In the peeling method of this embodiment,
The second optical film 51 is made to be the first optical film so that the optical axis of the first optical film 33 and the optical axis of the second optical film 51 intersect at an angle of 89.0 to 91.0 °. It is preferable to adhere to 33.
According to such a configuration, the first optical film 33 can be reinforced more reliably.

In the peeling method of the present embodiment, it is preferable that the second optical film 51 is a defective product.
According to such a configuration, what is originally discarded can be used, so that the peeling operation becomes more efficient.

As described above, according to the present embodiment, there is provided a peeling method that can easily peel the first optical film 33 from the substrate 31 while suppressing the first optical film 33 from being torn. The

The peeling method of the present embodiment is as described above, but the peeling method of the present invention is not limited to the above embodiment.

Next, the present invention will be described in more detail with reference to examples.

Example 1
Adhering the second optical film 51 to the outer surface 33a of the first optical film 33 of the laminate 30 so that the optical axis of the first optical film 33 and the optical axis of the second optical film 51 intersect, The first optical film 33 was peeled off together with the second optical film 51.

Specifically, the first optical film 33 was formed by laminating two protective films 45 on both surfaces of the polarizer 41 via a two-layer adhesive layer 43 having a second adhesive. A polarizing plate 33 (thickness: about 100 μm) was used. The optical axis of the first optical film 33 extended in parallel with the

edges

34 b and 34 d of the first optical film 33.
As the laminated body 30, the laminated body 30 formed by laminating the substrate 31 on one protective film 45 of the polarizing plate 33 via a first adhesive was used.
More specifically, two protective films 45 are laminated on both surfaces of the polarizer 41 via two adhesive layers 43 having a second adhesive, and one of the two protective films 45 is laminated. A separator (not shown) is laminated on the protective film 45 via a first adhesive, and a surface protective film (not shown) is laminated on the other protective film 45 via a fifth adhesive. Product (MCIG1465CUZZ10, manufactured by Nitto Denko Corporation), the separator is peeled off to expose the first adhesive, and is laminated on the substrate 31 through the first adhesive, and then the surface protection is performed together with the fifth adhesive. The laminate 30 was formed by peeling the film.

Further, the second optical film 51 is formed by laminating two protective films 65 on both sides of the polarizer 61 via two adhesive layers 63 having a third adhesive, and the above A polarizing plate 51 (thickness: about) having the same size as the polarizing plate 33 as viewed in the thickness direction and formed so that the optical axes of the polarizing plates 33 intersect with each other at an intersecting angle of 90 ° when they are exactly overlapped with the polarizing plate 33. 100 μm) was used. The optical axis of the second optical film 51 extended perpendicularly to the

edges

52b and 52d of the second optical film 51. Specifically, the crossing angle between both optical axes was 90.0 °.
More specifically, two protective films 65 are laminated on both surfaces of the polarizer 61 via two adhesive layers 63 having a third adhesive, and one of the two protective films 65 is laminated. A separator (not shown) is laminated on the protective film 65 through a fourth adhesive, and a surface protective film (not shown) is laminated on the other protective film 65 through a sixth adhesive. A product obtained by peeling off the separator from the product (MCIG1485CUC, manufactured by Nitto Denko Corporation) to expose one fourth adhesive and peeling the surface protective film together with the sixth adhesive was used as the polarizing plate 51.
The polarizing plate 51 was originally used for constituting an optical display device by being bonded to the surface of the substrate 31 opposite to the polarizing plate 33.

Then, as shown in FIG. 6, the second optical film 51 is attached to the outer surface 33 a of the first optical film 33 via the fourth adhesive exposed as described above. The corners 35a to 35d and the corners 53a to 53d of the second optical film 51 are coincident with each other (that is, the corners of the first and second

optical films

33 and 51 are coincident with each other). Glued to overlap. Thereby, the optical axis of the first optical film (polarizing plate) 33 and the optical axis of the second optical film (polarizing plate) 51 intersect (here, the intersecting angle of both optical axes is 90. The second optical film 51 was adhered to the first optical film 33 (cross bonding).
Then, using the peeling apparatus 1 shown in FIGS. 8 and 9, the first optical film 33 together with the second optical film 51 is used together with the corner 35 a of the first optical film 33 as the peeling start point P. It peeled in the direction (white arrow direction) which goes to the corner | angular part 35c facing the corner | angular part 35a. At this time, the state of tearing of the first optical film 33 was visually observed.
This was repeated 50 times, and when the first optical film 33 was not torn, the peeling was regarded as successful, and the peeling success rate was calculated. The results are shown in Table 1.

(Comparative Example 1)
The second optical film 51 is placed on the outer surface 33a of the first optical film 33 of the laminate 30 so that the optical axis of the first optical film 33 and the optical axis of the optical axis 51 of the second optical film are parallel to each other. The first optical film 33 and the second optical film 51 were peeled off.

Specifically, as shown in FIG. 12, as the second optical film 51, the separator is peeled off from the same polarizing plate 33 (commercial product (MCIG1465CUZZ10, manufactured by Nitto Denko Corporation)) as the first optical film 33. Using the exposed first adhesive, the polarizing plate 33 as the second optical film 51 is changed to the polarizing plate 33 as the first optical film 33, the first and second optical films 33, The 51 corners coincided with each other and were adhered so as to overlap exactly over the entire surface. That is, the same polarizing plate 33 was adhered to the outer surface 33a of the polarizing plate 33 so as to overlap exactly. Thereby, the second optical film (polarizing plate) 33 and the second optical film (polarizing plate) 51 have the second optical film (polarizing plate) 51 so that the optical axis of the second optical film (polarizing plate) 51 is parallel to the second optical film 33. The optical film 51 was bonded (parallel bonding).
Otherwise, in the same manner as in Example 1, using the peeling device 1, the first optical film 33 was peeled off together with the second optical film 51 with the corner 35a as the peeling start point P. Evaluation was performed in the same manner. The results are shown in Table 1.

As shown in Table 1, the optical axis of the first optical film 33 and the optical axis of the second optical film 51 intersect with each other using the second optical film 51 as the reinforcing film on the first optical film 33. The first optical film 33 can be peeled from the substrate 31 while suppressing the tearing of the first optical film 33, compared to the case where the two optical axes are bonded in parallel. It has been shown. Moreover, since it was possible to peel off the first optical film 33 while suppressing the first optical film 33 from being torn, it was found that this peeling work becomes simple.

Although the embodiments and examples of the present invention have been described as described above, it is also planned from the beginning to appropriately combine the features of the embodiments and examples. The embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the embodiments and examples described above but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

1: peeling device, 3: stage member, 5: peeling member, 7: peeling member, 30: laminate, 31: substrate, 31a: one surface, 33: first optical film, 33a: outer surface, 35a to 35d: Corner part, 51: Second optical film, 53a to 53d: Corner part

Claims

A peeling method for peeling the first optical film from a laminate comprising a substrate and a first optical film bonded on one surface of the substrate,
The first optical film has an optical axis;
A second optical film having an optical axis on the outer surface of the first optical film opposite to the substrate is crossed between the optical axis of the first optical film and the optical axis of the second optical film. Glue to
A peeling method for peeling the first optical film together with the second optical film.
The first and second optical films are rectangular,
The second optical film has the same size as the first optical film as viewed in the thickness direction, and each corner of the second optical film and each corner of the first optical film, Are configured such that the optical axis of the second optical film intersects the optical axis of the first optical film when the second optical film and the first optical film are overlapped with each other so as to match each other. The peeling method according to claim 1, wherein
The second optical film is adhered to the outer surface of the substrate opposite to the first optical film, and is used for constituting an optical display device together with the substrate and the first optical film. The peeling method according to claim 1, wherein the peeling method is the same film.
The peeling method according to any one of claims 1 to 3, wherein the first and second optical films are polarizing plates.
The second optical film is placed on the first optical film such that the optical axis of the first optical film and the optical axis of the second optical film intersect at an angle of 89.0 to 91.0 °. The peeling method according to any one of claims 1 to 4, wherein the peeling method adheres to a film.
The peeling method according to any one of claims 1 to 5, wherein the second optical film is a defective product.