KR20180128887A - Peeling method - Google Patents

Abstract

A peeling method for peeling off a first optical film from a laminate comprising a substrate and a first optical film bonded on one side of the substrate, wherein the first optical film has an optical axis, A second optical film having an optical axis is adhered to an outer surface of the optical film opposite to the base so that the optical axis of the first optical film and the optical axis of the second optical film cross each other, And peeling off the first optical film.

Description

Peeling method

Cross reference of related application

Priority is claimed on Japanese Patent Application No. 2016-068909, filed on March 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.

2. Description of the Related Art Conventionally, as a panel applied to an image display unit of an image display apparatus, a liquid crystal display panel, an organic EL display panel, and the like are known. As these panels, a laminate having a substrate formed of a hard glass plate or the like and an optical film having an optical axis such as a polarizing plate adhered to one side or both sides of the substrate through an adhesive is used.

This type of laminate is manufactured by adhering an optical film to a substrate and is to be inspected after manufacture. The optical film thus adhered to the substrate is usually formed to be smaller than the substrate. In the above inspection, problems such as contamination or breakage of the bonded optical film, mixing of air and foreign matters between the polarizing plate and the substrate may be found. In this case, by peeling off the optical film from the liquid crystal display panel or the like, the obtained substrate is reused for the production of other liquid crystal display panels and the like. The peeling of the optical film in this way is generally called a rework.

However, when the optical film is peeled from the laminate in this way, the optical film is torn (broken) at the time of peeling, and a part thereof may remain on the substrate. Here, as is generally well known, an optical film adhered to a substrate is not originally intended to be peeled off, but is adhered to the substrate with a strong adhesive force so as not to be easily peeled off. As a result, when the optical film is attempted to be peeled off from the substrate, a large force is applied to the optical film, and the optical film is torn according to the method of applying the force. In recent years, in particular, the thickness of the optical film has been progressing, and the optical film has become more prone to tear.

Therefore, a method of peeling the film from the laminate while suppressing the breakage of the film has been proposed.

For example, a peeling method for peeling an optical film from a laminate which is an electro-optical panel in which an optical film is adhered to a substrate, the method comprising: pressing a surface of a substrate on which an optical film is peeled with a substrate pressing blade, There has been proposed a peeling method in which the laminate is vibrated while being pressed by a film pressing roller to peel off the optical film. According to this peeling method, it is possible to suppress the fracture of the optical film (see Patent Document 1).

Japanese Patent Application Laid-Open No. 2009-29561

However, even if the substrate is pressed with the substrate pressing blade as in the peeling method described in Patent Document 1 and the laminate is vibrated while peeling the optical film while pressing the laminate with the film pressing roller, there is a fear that the optical film is still broken.

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

Means for Solving the Problems In order to solve the above problems, the inventors of the present invention have studied extensively, and found out that there is a case where an optical film is broken even when an optical film is peeled off using the above-described pressing member.

In order to suppress this fracture, the present inventors have studied extensively on the application of a reinforcing film. As a result, in the case where the second optical film having the optical axis is bonded to the first optical film having the optical axis laminated on the substrate, the first optical film I found that it was hard to break. Further, in the case where the second optical film having the optical axis is bonded to the first optical film having the optical axis laminated on the substrate such that the optical axes of the second optical film are mutually crossed, when these optical axes are bonded so as to be parallel to each other It was found that the first optical film was hardly broken when peeling the first optical film together with the second optical film from the substrate.

Considering that the first optical film to be peeled is reinforced, it is preferable to adhere the second optical film having the same size as the reinforcing film. However, if cutting is performed in order to form a second optical film having the same size as that of the first optical film, cutting chips may be generated, and it is also troublesome to remove the cutting chips. In addition, since such a lot of hands are involved and the waste part is generated, it is not preferable from the viewpoint of cost.

As a result of further intensive studies, the inventors of the present invention have found that one of the optical films originally used in one set and having an adhesive layer on each surface side is used as a first polarizing plate used in an optical display apparatus, (Second optical film) at the time of peeling (rework) of the optical film, it is not necessary to specifically produce the second optical film of the same size, so that it is possible to omit the labor of cutting, I found out what I could do. Further, as described above, when a polarizing plate (polarizing plate parallel to the extending directions of optical axes) is used (parallel Nicole), for example, a polarizing plate that is a subject of peeling and a pair (Cross-nicol), which is equivalent to a polarizing plate (which is orthogonal to the extending directions of the optical axis), is more difficult to be broken at the time of peeling.

Based on these findings, the present invention has been completed.

That is,

A peeling method for peeling off a first optical film from a laminate comprising a substrate and a first optical film bonded on one side of the substrate,

Wherein the first optical film has an optical axis,

A second optical film having an optical axis is adhered to an outer surface of the first optical film opposite to the substrate so that the optical axis of the first optical film crosses the optical axis of the second optical film,

And peeling the first optical film together with the second optical film.

In the peeling method of the above configuration,

Wherein the first and second optical films have a rectangular shape,

Wherein the second optical film has the same size as that of the first optical film in the thickness direction and is formed so that the corner portions of the second optical film and the respective corner portions of the first optical film coincide with each other, It is preferable that the optical axis of the second optical film intersects with the optical axis of the first optical film when the first optical film overlaps with the first optical film.

In the peeling method of the above configuration,

It is preferable that the second optical film is the same film as the film used for constituting the optical display device together with the substrate and the first optical film adhered to the surface of the substrate opposite to the first optical film Do.

In the peeling method of the above configuration,

It is preferable that the first and second optical films are polarizers.

In the peeling method of the above configuration,

It is preferable that the second optical film is adhered to the first optical film so that the optical axis of the first optical film intersects with the optical axis of the second optical film at an angle of 89.0 to 91.0 degrees.

In the peeling method having the above structure, it is preferable that the second optical film is a defective inspection product.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, there is provided a peeling method which makes it possible to easily peel the optical film from a substrate while suppressing tearing of the optical film.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic top view showing a laminate to which a peeling method of the present embodiment is applied. Fig.
Fig. 2 is a schematic side view showing an example of the layer structure of the laminate of Fig. 1; Fig.
Fig. 3 is a schematic side view showing an example of the layer structure of the first optical film in the laminate of Fig. 1; Fig.
4 is a schematic side view showing an example of the layer structure of the second optical film.
5 is a schematic top view showing an example of a state in which a second optical film is adhered to a first optical film;
6 is a schematic top view showing an example of a state in which a second optical film is bonded to a first optical film;
7 is a schematic side view showing an example of a state in which a second optical film is bonded to a first optical film.
8 is a schematic top view showing a state in which a first optical film peeled from a peeling starting point is wound around a peeling apparatus used in the peeling method of this embodiment.
9 is a schematic side view showing a state in which a first optical film peeled from a peeling starting point is wound around a peeling apparatus used in the peeling method of this embodiment.
10 is a schematic side view showing a state in which the first optical film is further wound by rotation of the winding member and the separated first optical film is sequentially wound
11 is a schematic side view showing a state in which all of the first optical film is peeled off by rotation of the winding member;
12 is a schematic top view showing a state in which a second optical film is adhered to a first optical film in Comparative Example 1. Fig.

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

First, a laminate in which the first optical film is peeled off in the peeling method of the present embodiment will be described.

1 and 2, the laminate 30 has a rectangular substrate 31 and a first optical film 33 adhered on one surface 31a of the substrate 31 I have.

The substrate 31 is a laminate of the first optical film 33 and is formed larger than the first optical film 33.

As the substrate 31, for example, hard glass can be cited.

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 and 34d and the intersection of these end edges constitutes four corner portions 35a, 35b, 35c and 35d .

The direction of extension of the optical axis of the first optical film 33 is not particularly limited. For example, as shown in Fig. 1, its optical axis extends parallel to one end edge 34 (here end edge 34b or 34d) of the first optical film 33 Shape can be employed.

The reason why the optical axis of the first optical film 33 extends parallel to one end edge 34 of the first optical film 33 is that it is parallel to the end edge 34 of the first optical film 33 (The crossing angle is 0 °) and the case where the crossing angle is extended within ± 1.0 °, preferably within ± 0.3 °.

The first optical film 33 is adhered to the upper surface 31a of the substrate 31 by a first adhesive (not shown).

The thickness of the first optical film 33 is not particularly limited and may be suitably set. However, for example, the smaller the thickness of the first optical film 33, the lower the strength and tends to be torn. On the other hand, the larger the thickness of the first optical film 33, the greater the strength and tends to be difficult to tear. Therefore, for example, in the case where the thickness of the first optical film 33 is not more than 200 mu m, preferably not more than 90 mu m, more preferably not more than 50 mu m, the peeling method of the present embodiment can be preferably applied. Thus, even when the thickness is relatively small, the first optical film 33 can be reinforced and it is possible to make the first optical film 33 difficult to tear at the time of peeling, so that the peeling method of the present embodiment is more useful It is because.

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

3, the polarizing plate 33 includes, for example, a polarizing plate 41 and a polarizing plate 41, for example, as shown in FIG. 3. In the case where the first optical film 33 is a polarizing plate 33, A two-layered adhesive layer 43 having a second adhesive formed on both surfaces thereof, and two protective films 45 laminated on the two adhesive layers 43. [

3 shows a mode in which the polarizing plate 33 has the polarizer 41 and the protective film 45 laminated on both surfaces thereof, but the polarizing plate 33 also has the polarizer 41, (41) and a protective film (45) laminated on only one side thereof.

Examples of the polarizer 41 include those formed by dyeing and stretching a polyvinyl alcohol-based film.

The thickness of the polarizer 41 is usually about 2 to 30 mu m.

As the first and second adhesives, conventionally known adhesives can be mentioned.

Examples of the protective film 45 include cellulose resins such as triacetyl cellulose and the like, polyester resins, polyether sulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) , A film formed from one or more selected from the group consisting of a cyclic polyolefin resin (norbornene resin), a polyarylate resin, a polystyrene resin, a polyvinyl alcohol resin, and a mixture thereof.

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

The first optical film 33 is adhered to the upper surface 31a of the substrate 31 by the first adhesive in the laminate 30 used in the peeling method of this embodiment. The adhesive force of the first optical film 33 (i.e., the adhesive force of the first adhesive) to the substrate 31 is usually 5 to 15 N / 25 mm. With this adhesive force, the first optical film 33 can be adhered to the substrate 31 relatively firmly. In addition, even when the first optical film 33 firmly adhered is peeled off, the rupture of the first optical film 33 can be suppressed. Therefore, the peeling method of the present embodiment is suitable for the laminate 30 having the substrate 31 and the first optical film 33 adhered with the adhesive strength in the above-mentioned range.

This adhesive force is a value measured when the first optical film 33 is peeled from the substrate 31 in the direction of 90 占 at a tensile speed of 300 mm / min by an autograph (precision universal testing machine, Shimadzu Corporation).

Next, the second optical film 51 adhered to the first optical film 33 in the present 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 is defined by four corner portions 53a, 53b, 53c, and 53d.

The extending direction of the optical axis of the second optical film 51 is not particularly limited. 5, its optical axis is parallel to the one end edge 52 (here, 52a or 52c) of the second optical film 51 (the end edge 52b or 52d) (I.e., perpendicular to the longitudinal direction).

It is to be noted that the optical axis of the second optical film 51 is parallel to one end edge 52 of the second optical film 51 when it extends completely parallel to the one end edge of the second optical film 51 The angle is 0 DEG) and the case where the crossing angle is extended within the range of +/- 1.0 DEG, preferably within +/- 0.3 DEG.

The second optical film 51 is adhered to the outer surface 33a of the first optical film 33 such that the optical axis of the first optical film 33 and the optical axis of the second optical film 51 cross each other.

The second optical film 51 may be the same 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 appropriately set.

The second optical film 51 may be a film formed of a material similar to that of the first optical film 33, or may be a film different from the first film.

When the second optical film 51 is the 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. 4, 51 includes a polarizer 61 and a two-layer adhesive layer 63 having a third adhesive formed on both sides of the polarizer 61 and two protective layers 63 laminated on the two adhesive layers 63 And a film 65 are provided.

4 shows a mode in which the polarizing plate 51 has the polarizer 61 and the protective film 65 laminated on both surfaces thereof, but the polarizing plate 51 also has the polarizer 61 and a protective film 65 laminated on only one side thereof.

The polarizer 61 and the protective film 65 may be made of the same material and thickness as those of 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 has the same size as the first corner portions 35a to 35d and the corner portions 53a to 53d of the second optical film 51, When the second optical film 51 is overlapped with the first optical film 33 such that the first optical film 33 and the second optical film 53d coincide with each other (that is, the corners of the first optical film 33 and the second optical film 51) , And the optical axis of the second optical film (51) crosses the optical axis of the first optical film (33).

The reason why the second optical film 51 has the same size as the first optical film 33 in the thickness direction is that the length of each end edge 52a to 52d of the second optical film 51 is smaller than the length The length of each end edge 34a to 34d of the film 33 or the length of each end edge 34a to 34d of the first optical film 33 is less than the thickness of the first optical film 33 It means big.

The second optical film 51 is of the same size as the first optical film 33 so that the second optical film 51 covers the entire surface of the first optical film 33, The optical film 51 can be bonded to the first optical film 33. [ As a result, the entirety of the first optical film 33 can be sufficiently reinforced by the second optical film 51.

When the second optical film 51 is overlapped with the first optical film 33 so that the corner portions (the corner portions 35a to 35d and the corner portions 53a to 53d) are aligned 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 so that only the first optical film 33 and the second optical film 51 are superimposed on each other The optical axis of the first optical film 33 and the optical axis of the second optical film 51 can be intersected with each other.

Thus, the peeling operation becomes more efficient.

Here, as shown in Fig. 1, the substrate 31 is generally larger than the first optical film 33. [ When the end edges 52a to 52d of the second optical film 51 are outwardly outward than the end edges 34a to 34d of the first optical film 33, There is a possibility that the adhesion of the first optical film 33 to the substrate 31 through the first adhesive may hinder the peeling of the first optical film 33 from the substrate 31 by this adhesion. In general, the first optical film 33 is cut so as to have a predetermined shape, and microscopically, a portion (for example, a jagged portion) that is not straight on the end edges 34a to 34d have. As a result, if the end edges 52a to 52d of the second optical film 51 are inserted inside the edge of the end portion of the first optical film 33, a rupture occurs with the non-straight portion as a starting point There is a possibility of causing a problem.

However, as described above, since the second optical film 51 is the same size as the first optical film 33, the end edges 34a to 34d of the first optical film 33, It is possible to adhere the second optical film 51 to the outer surface 33a of the first optical film 33 so that each end edge 52a to 52d of the first optical film 51 is located on one surface. As a result, it is possible to suppress the problem caused by the release of the second optical film 51 as described above and the problem caused by the retreat, so that the first optical film 33 It is possible to separate the first optical film 33 from the substrate 31 while suppressing tearing.

As described above, the edge portions 52a to 52d of the second optical film 51 are located outside the edge portions 34a to 34d of the first optical film 33, and the first optical film 33 Or less in thickness than the thickness of the protrusion. In this case, the second optical film 51 does not adhere to the substrate 31, and the first optical film 33 is prevented from being torn more reliably, It becomes possible to peel off from the substrate 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, The same film as the film used for constituting the optical display device together with the film 33 is preferable. That is, the second optical film 51 of 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, It is preferable that a film used for constituting an optical display device together with the optical film 33 be used.

According to such a configuration, one set of optical films originally used is stacked so that the optical axes thereof cross each other, and one of the optical films having the same size can be used as the second optical film 51 as it is. Further, since the first optical film 33 is formed in the same size as the first optical film 33, the second optical film 51 can be superimposed on the first optical film 33 without cutting or the like. Therefore, it is more efficient.

The second optical film 51 of 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, It is preferable to devote the film used for constituting the optical display device together with the one optical film 33. [

In the present embodiment, it is preferable that the second optical film 51 is a defective inspection product.

The inspection defective product is an optical film originally adhered to the other surface (outer surface opposite to the first optical film 33) of the substrate 31. The defective inspection product is a substrate 31, a first optical film 33, What is meant to be a product (optical display) together is considered to be outside the specification as a result of optical inspection or visual inspection.

Since the second optical film 51 is an inspection defective, the originally discarded material can be used, which is more efficient.

It is preferable that the second optical film 51 is a defective inspection product having the same fourth adhesive agent as the above-mentioned first adhesive agent on the side to be adhered to the first optical film 33. [

As described above, since the second optical film 51 is a defective inspection product having the fourth adhesive, it is difficult to apply the fourth adhesive on purpose when the second optical film 51 is adhered to the first optical film 33 Can be omitted.

When the second optical film 51 has the same size as the first optical film 33 in the thickness direction and the first corner portions 35a to 35d and the second optical film 51 have the same size, The second optical film 51 is disposed so that the corner portions 53a to 53d of the first optical film 33 and the corner portions of the second optical film 51 coincide with each other The optical axis of the second optical film 51 crosses the optical axis of the first optical film 33 when the first optical film 33 overlaps the first optical film 33. Further, Do.

By using the defective inspection product as the second optical film 51 having the same size as that of the first optical film 33 as described above, the second optical film 51 ) Can be used, which is more efficient.

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

In the peeling method of this embodiment,

A peeling method in which the first optical film 33 is peeled off from the laminate 30 having the substrate 31 and the first optical film 33 adhered on one surface 31a of the substrate 31 Lt;

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 on the opposite side of the substrate 31 from the optical axis of the first optical film 33, 2 < / RTI >

And the first optical film 33 is peeled off together with the second optical film 51.

5, 6, and 7, the second optical film 51 is formed on the outer surface 33a of the first optical film 33 of the layered product 30, The optical film 33 and the optical axis of the second optical film 51 cross each other so as to cross each other as a reinforcing film. 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. 6, the peeling direction X is indicated by a white arrow.

For example, in the present embodiment, the second optical film 51 is adhered to the outer surface 33a of the first optical film 33 so as to cross both optical axes by a fourth adhesive (not shown).

As the fourth adhesive, similarly to the first adhesive, conventionally known adhesives can be mentioned.

The angle of intersection 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 adhered to the first optical film 33 is particularly limited It is not. For example, the crossing angle is preferably 89.0 to 91.0 DEG, and more preferably 89.7 to 91.3 DEG. Figs. 5 and 6 show a form in which the crossing angle of both optical axes is 90.0 degrees.

After the second optical film 51 is bonded to the first optical film 33, for example, as shown in Fig. 6, one corner portion 35a of the first optical film 33 is separated from the peeling starting point P And the first optical film 33 is peeled off together with the second optical film 51.

As shown in Figures 5 and 6, one end edge 52 (here, a second optical film) is attached to a first optical film 33 having an optical axis parallel to one end edge 34 (here 34b or 34d) In the case where the second optical film 51 having the optical axis which is parallel to the optical axis (perpendicular to the end edge 52b or 52d in the first optical film 52a or 52c in FIG. Can be made the peeling starting point P.

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

A preferable peeling apparatus 1 used in the peeling method of this embodiment will be described with reference to Figs. 8 to 11. Fig. 8 to 11 show a mode in which the first optical film 33 to which the second optical film 51 is adhered is peeled off from the substrate 31 as shown in Fig.

8 and 9, the peeling apparatus 1 according to the present embodiment includes a stage member 3 on which a laminate 30 is mounted, a peeling aid member 7 on a roller, a laminate 30 And the corner portion 35a of the first optical film 33 peeled off by the peeling auxiliary member 7 is held together with the second optical film 51 and the first optical film 33 is peeled off from the first optical film 33, And a peeling member 5 for peeling the peeling member 5 in order.

More specifically, in the peeling apparatus 1 of this embodiment, the peeling member 5 is provided with the winding member 5. The winding member 5 has a corner portion 35a of the first optical film 33 which is peeled from the laminate 30 and curved by the peeling auxiliary member 7 and the second optical film The second optical film 51 is wound together with the second optical film 51 along with the second optical film 51 and the first optical film 33 is further peeled and wound in turn while the second optical film 51 is rotated.

The stage member 3 is a stack on which the stacked body 30 is stacked until all of the first optical films 33 are peeled from the stacked body 30. [

The peeling assistant member 7 peels the first optical film 33 from the substrate 31 and curves the peeled first optical film 33 together with the second optical film 51, . As the peeling auxiliary member 7, a roller body can be mentioned.

The peeling member 5 is wound around the corner portion 35a of the peeled first optical film 33 together with the second optical film 51 overlapping with the second optical film 51, (33) together with the second optical film (51) are successively wound while further peeling.

Examples of the peeling member 5 include a roller that is rotated by driving by a driving device 17 such as a motor.

The corner portion 35a of the peeled first optical film 33 is adhered to the peeling member 5 by an adhesive tape (not shown) or the like together with the second optical film 51 which overlaps the corner portion 35a And is fixed.

In Fig. 8, the first optical film 33 is peeled from the substrate 31 together with the first adhesive (not shown).

In this embodiment, the corner portion 35a of the first optical film 33 is peeled together with the second optical film 51 from the laminate 30 using the peeling apparatus 1, And guided to the rear end side while being bent by the peeling member 7, and wound around the peeling member 5. In this state, by rotating the peeling member 5, the first optical film 33 is sequentially peeled off from the substrate 31 together with the second optical film 51, and is wound.

The corner portion 35a of the first optical film 33 is peeled off from the laminate 30, for example, in the following manner. That is, a peeling knife (not shown) having a blade at the tip end is held by a finger of the operator, and a gap is formed between the substrate 31 of the laminate 30 and the corner portion 35a of the first optical film 33 The corner portion 35a of the first optical film 33 is peeled off by inserting the peeling knife. More specifically, the peeling knife is inserted between the first adhesive (not shown) adhered to the surface 33b of the first optical film 33 on the substrate 31 side and the substrate 31 , The first optical film (33) is peeled together with the first adhesive.

The corner portion 35a of the peeled first optical film 33 is wrapped around the peeling member 5 together with the second optical film 51 to be stretched, for example, in the following manner. That is, the corner portion 35a of the peeled first optical film 33 is wound around the circumferential surface of the peeling member 5 and fixed on the circumferential surface thereof with an adhesive tape (not shown) or the like, The walk is performed.

When the first optical film 33 is further wound and peeled from the state shown in Fig. 9 by the peeling member 5 in succession, as the peeling of the first optical film 33 progresses, The layered body 30 sequentially moves in the direction opposite to the peeling direction X (see the white arrows in Figs. 10 and 11), as shown in Fig. That is, the first optical film 30 relatively moves with respect to the stage member 3. More specifically, the stacked body 30 slides on the stage member 3. As shown in Fig. 11, when all of the first optical film 33 is finally peeled off and the substrate 31 is completely exposed, the laminate 30 stops moving.

In this manner, the first optical film 33 is peeled 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 far as it can peel the first optical film 33 , And can be set appropriately.

For example, in view of the easy peeling off of the first optical film 33, as shown in Figs. 6 and 9, the corner portions 35c positioned diagonally from the one corner portion 35a The first optical film 33 may be peeled off.

As described above, the first optical film 33 is peeled from the one corner portion 35a toward the corner portion 35c located at the diagonal angle, thereby enhancing the reinforcing effect of the second optical film 51 , The first optical film 33 can be peeled off.

As described above, in the peeling method of the present embodiment,

A peeling method in which the first optical film 33 is peeled off from the laminate 30 having the substrate 31 and the first optical film 33 adhered on one surface 31a of the substrate 31 Lt;

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 on the opposite side of the substrate 31 from the optical axis of the first optical film 33, 2 < / RTI >

And the first optical film 33 is peeled off together with the second optical film 51.

According to this configuration, the second optical film 51 is bonded on the first optical film 33 so that the optical axes of the first optical film and the second optical film 51 cross each other, The first optical film 33 is hardly broken when the optical film 33 is peeled from the first optical film 31.

The reason is presumed as follows. That is, in an optical film having an optical axis, the film is oriented to produce directionality, and tends to tear in a direction parallel to the alignment direction, and tearing is difficult in an orthogonal direction. In this respect, by adhering the optical films so as to cross each optical axis, the direction in which one optical film is difficult to break and the direction in which the other optical film is difficult to break intersects each other. As a result, It is presumed that reinforcing the optical films mutually mutually makes the first optical film 33 difficult to break.

Therefore, according to the above configuration, it is possible to easily peel the first optical film 33 from the substrate 31 while suppressing tearing of the first optical film 33. [

In the peeling method of this embodiment,

The first and second optical films 31 and 51 have a rectangular shape,

The second optical film 51 is of the same size as the first optical film 33 in the thickness direction and is formed so as to cover the corner portions 53a to 53d of the second optical film 51 and the first optical film 33 The second optical film 33 is disposed on the first optical film 33 so that the corner portions 35a to 35d of the first optical film 33 and the corresponding corner portions of the second optical film 33, It is preferable that the optical axis of the second optical film 51 intersects the optical axis of the first optical film 33. In this case,

The second optical film 51 has the same size as that of the first optical film 33 so that the second optical film 51 covers the entire surface of the first optical film 33 2 optical film 51 can be adhered to the first optical film 33. [ As a result, the entirety of the first optical film 33 can be sufficiently reinforced by the second optical film 51.

Further, when the first optical film 33 and the second optical film 51 overlap each other so that the corresponding corner portions (the respective corner portions 35a to 35d and the corner portions 53a to 53d) Is configured so as to intersect the optical axis of the first optical film 33 so that only the first optical film 33 and the second optical film 51 are superimposed on each other with a perfect fit, The optical axis of the first optical film 33 and the optical axis of the second optical film 51 can be intersected.

Therefore, the peeling operation becomes more efficient.

In the peeling method of this embodiment,

The second optical film 51 is adhered to the surface of the substrate 31 opposite to the first optical film 33 to form the optical display device together with the substrate 31 and the first optical film 33 It is preferable that the film is the same film as used for the film.

According to this structure, one set of optical films originally used as the second optical film 51 can be used as they are, so that they are used as one set such that the optical axes are stacked so as to cross each other. Further, since the first optical film 33 is formed in the same size as the first optical film 33, the second optical film 51 can be superimposed on the first optical film 33 without cutting or the like. Therefore, it is more efficient.

In the peeling method of this embodiment,

It is preferable that the first and second optical films 33 and 51 are the polarizing plates 33 and 51.

According to such a configuration, one of the optical films originally used as a pair such that the optical axes thereof are laminated alternately 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 adhered to 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 cross at an angle of 89.0 to 91.0 ° .

With this configuration, the first optical film 33 can be more reliably reinforced.

In the peeling method of the present embodiment, it is preferable that the second optical film 51 is a defective inspection product.

According to this configuration, since the originally discarded product can be used, the peeling operation becomes more efficient.

As described above, according to the present embodiment, there is provided a peeling method which makes it possible to easily peel off the first optical film 33 from the substrate 31 while suppressing tearing of the first optical film 33 .

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 while showing Examples.

Example

(Example 1)

The second optical film 51 is formed on the outer surface 33a of the first optical film 33 of the layered product 30 such that the optical axis of the first optical film 33 and the optical axis of the second optical film 51 cross And the first optical film 33 was peeled together with the second optical film 51.

Specifically, as the first optical film 33, a polarizing plate 41 formed by laminating two protective films 45 with a two-layer adhesive layer 43 having a second adhesive on both sides of the polarizer 41 33 (thickness: about 100 mu m) was used. The optical axis of the first optical film 33 extended parallel to the end edges 34b and 34d of the first optical film 33. [

As the laminate 30, a laminate 30 formed by laminating a substrate 31 on one protective film 45 of the polarizer 33 with a first adhesive was used.

More specifically, two protective films 45 are laminated via two adhesive layers 43 having a second adhesive on both sides of the polarizer 41, and one of the two protective films 45 (Not shown) is laminated on the protective film 45 of the other protective film 45 with a first adhesive interposed therebetween and a surface protective film (not shown) is laminated on the other protective film 45 with a fifth adhesive (MCIG1465CUZZ10, manufactured by Nitto Denko Co., Ltd.), the separator was peeled off to expose the first adhesive, and the first adhesive was laminated on the substrate 31 via the first adhesive, and then the surface protective film was peeled off together with the fifth adhesive. Thereby forming a laminate 30.

As the second optical film 51, two protective films 65 are laminated and formed on both sides of the polarizer 61 through a two-layer adhesive layer 63 having a third adhesive, A polarizing plate 51 (thickness: about 100 μm) formed so as to cross each other at an intersecting angle of 90 ° when the polarizing plate 33 and the polarizing plate 33 have the same size and the same size as the polarizing plate 33 Used. The optical axis of the second optical film 51 extended perpendicularly to the end edges 52b and 52d of the second optical film 51. Specifically, the intersection angle of both optical axes was 90.0 degrees.

More specifically, two protective films 65 are laminated on both sides of the polarizer 61 with a two-layer adhesive layer 63 having a third adhesive interposed therebetween, and the two protective films 65 A separator (not shown) is laminated on one protective film 65 with a fourth adhesive interposed therebetween and a surface protective film (not shown) is formed on the other protective film 65 through a sixth adhesive A separator was peeled from a commercial product (MCIG1485CUC, manufactured by Nitto Denko Co., Ltd.) to expose one fourth adhesive, and the surface protective film was peeled off together with the sixth adhesive as the polarizing plate 51.

The polarizing plate 51 was originally used to adhere to the surface of the substrate 31 opposite to the polarizing plate 33 to constitute an optical display device.

6, the second optical film 51 is bonded to the outer surface 33a of the first optical film 33 through the fourth adhesive exposed as described above to the first optical film 33 And the respective corner portions 53a to 53d of the second optical film 51 (that is, the corner portions of the first and second optical films 33 and 51) And they were bonded so as to be perfectly superposed on the entire surface. Thus, the optical axis of the first optical film (polarizing plate) 33 and the optical axis of the second optical film (polarizing plate) 51 intersect with each other (here, the intersection angle of both optical axes is 90.0 degrees) The second optical film 51 is adhered to the first optical film 33 (cross sticking).

8 and 9, the corner portion 35a of the first optical film 33 is set as the peeling starting point P, and the first optical film 33 is set as the peeling starting point P, Was peeled together with the film 51 in the direction (white arrow direction) toward the corner portion 35c facing the one corner portion 35a. The rupture state of the first optical film 33 at this time was observed by observing.

This was repeated 50 times. When the first optical film 33 was not torn, the peeling succeeded and the peeling success rate was calculated. The results are shown in Table 1.

(Comparative Example 1)

The second optical film 51 is attached to the outer surface 33a of the first optical film 33 of the laminate 30 and the optical axis of the optical axis of the first optical film 33 and the optical axis 51 of the second optical film And the first optical film 33 and the second optical film 51 were peeled together.

Specifically, as shown in Fig. 12, a separator is peeled from the first optical film 33 and the same polarizing plate 33 (commercial product (MCIG1465CUZZ10, manufactured by Nitto Denko Co., Ltd.)) as the second optical film 51 The polarizing plate 33 serving as the second optical film 51 is laminated on the polarizing plate 33 serving as the first optical film 33 and the first and second optical films 33 and 51 ) So as to be superimposed on each other in such a manner that the corners coincide with each other and are perfectly superposed on the entire surface. That is, the polarizing plate 33 such as this was adhered to the outer surface 33a of the polarizing plate 33 so as to be superimposed on each other. The second optical film 51 is provided on the first optical film 33 so that the optical axis of the first optical film (polarizing plate) 33 is parallel to the optical axis of the second optical film (polarizing plate) (Parallel bonding).

Except that the first optical film 33 was used as the peeling starting point P and the corner portion 35a was used as the peeling starting point P with the second optical film 51 in the same manner as in Example 1 except that the peeling apparatus 1 was used. Peeled off, and evaluated in the same manner as in Example 1. The results are shown in Table 1.

The optical axis of the first optical film 33 and the optical axis of the second optical film 51 of the first optical film 33 and the optical axis of the second optical film 51 are the same as the first optical film 33 and the second optical film 51, The first optical film 33 is peeled off from the substrate 31 while being prevented from tearing the first optical film 33 as compared with the case where the first optical film 33 and the second optical film 33 are bonded so as to cross each other, I can do it. In addition, since it is possible to peel off the first optical film 33 while suppressing tearing of the first optical film 33, it can be seen that the peeling work is easy.

As described above, the embodiments and the examples of the present invention have been described. However, it is also originally planned to appropriately combine the features of the embodiments and the embodiments. It is also to be understood that the embodiments and examples disclosed herein are by way of illustration and not of limitation in all respects. The scope of the present invention is not limited to the above-described embodiments and examples, but is defined by the appended claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

1: peeling device
3:
5: peeling member
7: member for peeling
30: laminate
31: substrate
31a: one side
33: first optical film
33a: outer surface
35a to 35d:
51: second optical film
53a to 53d:

Claims (6)

A peeling method for peeling off a first optical film from a laminate comprising a substrate and a first optical film bonded on one side of the substrate,
Wherein the first optical film has an optical axis,
A second optical film having an optical axis is adhered to an outer surface of the first optical film opposite to the substrate so that the optical axis of the first optical film crosses the optical axis of the second optical film,
And peeling the first optical film together with the second optical film. The optical film of claim 1, wherein the first and second optical films have a rectangular shape,
Wherein the second optical film has the same size as that of the first optical film in the thickness direction and is formed so that the corner portions of the second optical film and the respective corner portions of the first optical film coincide with each other, Wherein the optical axis of the second optical film intersects the optical axis of the first optical film when the first optical film overlaps with the first optical film. 3. The optical display device according to claim 1 or 2, wherein the second optical film is adhered to an outer surface of the substrate opposite to the first optical film to constitute an optical display device together with the substrate and the first optical film And the same film as the film to be used. The peeling method according to any one of claims 1 to 3, wherein the first and second optical films are polarizing plates. The optical film according to any one of claims 1 to 4, wherein 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 degrees, 1 < / RTI > The peeling method according to any one of claims 1 to 5, wherein the second optical film is defective in inspection.

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