TW201805177A - Stripping method - Google Patents

Abstract

Provided is a stripping method for stripping an optical film piece from a laminate body that includes a substrate and the optical film piece, wherein the optical film piece is formed by cutting an optical film using a cutting blade that runs relative to the optical film, and the optical film piece has four end edges formed by the cutting, the method including stripping the optical film piece from the substrate so that a stripping direction for at least one of the end edges of the optical film piece is the same direction as the moving direction of the cutting blade relative to the optical film at a position at which the cutting blade contacts the optical film during the cutting.

Description

Stripping method

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

Previously, as a panel applied to an image display portion of an image display device, a liquid crystal display panel, an organic EL display panel, and the like are known. As these panels, a laminate is used. The laminate has a substrate formed of a hard glass plate, etc., and a polarizer plate (polarizing film) adhered to one surface or both surfaces of the substrate via an adhesive Optical diaphragm. This type of build-up system is produced by cutting an optical film into a rectangular shape and then attaching it to a substrate, and then inspecting after manufacturing. As such, the optical film next to the substrate is usually formed smaller than the substrate. In the above inspection, there were cases where dirt or damage of the optical film to be attached, and air or foreign matter mixed between the optical film and the substrate were found. In this case, the substrate obtained by peeling off the optical film from the liquid crystal display panel or the like can be reused in the manufacture of another liquid crystal display panel or the like. Such peeling of the optical film is generally called reworking. On the other hand, when the optical film is peeled from the laminate as described above, the optical film may be broken (broken) during peeling, and a part of it may remain on the substrate. Here, as is generally known, the optical film adhering to the substrate is not originally intended to be peeled off, and is adhered to the substrate with a strong adhesive force in a manner that is not easily peeled off. Therefore, if it is intended to peel off the optical film from the substrate, a large force is applied to the optical film, and the optical film is broken due to the manner in which the force is applied. In recent years, in particular, the thinning of the optical film has been changing rapidly, and the optical film has become more likely to break. Therefore, the industry proposes a method of peeling the film from the laminate while suppressing the breakage of the film. For example, a method is proposed in which a film is peeled from a laminate having a substrate and a film that is easily broken next to the substrate, an adhesive sheet is attached to the entire surface of the film that is easily broken, and the The film is peeled together with the adhesive sheet (see Patent Document 1). [Prior Art Literature] [Patent Literature] [Patent Literature 1] Japanese Patent Laid-Open No. 2014-88256

[Problems to be Solved by the Invention] However, as in the peeling method described in Patent Document 1, it is laborious and time-consuming to adhere the sheet to the entire surface of the optical film. Moreover, even in the case where the entire surface of the optical film is adhered to the sheet, there is a possibility that the optical film may break when peeled off. In view of the above situation, the present invention has an object to provide a peeling method that can easily peel the optical film from the substrate while suppressing the breakage of the optical film. [Technical Means for Solving the Problem] As a result of in-depth study of the above-mentioned problems by the present inventors, the present inventors have found that according to the part The relative moving direction of the film is such that the optical film is not easily broken when the optical film is peeled off. Specifically, the present inventors produced a rectangular optical film with four end edges by cutting the optical film, and attached the obtained optical film to a substrate to form a laminate, and investigated the laminate The rupture of the optical film when the optical film is peeled off. As a result, the present inventors found that a burr (a small piece portion) inclined by cutting and protruding outward is formed in one end edge of the optical film, thereby generating a zigzag pattern. If the optical film is peeled off by the tension of the grain, the optical film becomes easy to break. Furthermore, the present inventors found out that the above-mentioned small portion protrudes so as to incline toward the above-mentioned moving direction of the cutting blade of the portion that comes into contact with the optical film during cutting. Furthermore, the present inventors found that the direction of the peeling of the optical film at one end of the optical film and the above-mentioned moving direction of the cutting blade at the portion in contact with the optical film at the time of cutting become the same direction The optical film is peeled by means, and the tension applied to the optical film at the time of peeling does not reverse the zigzag pattern described above. As a result, the cracking of the optical film using the zigzag pattern as a starting point is suppressed, and the present invention is completed. Specifically, the peeling method of the present invention peels the optical film from a rectangular laminate having a substrate and an optical film attached to one surface of the substrate; and the optical film The cutting knife that the film runs relatively cuts off the optical film and has four end edges formed by the cutting; the peeling direction of the optical film at least one of the four end edges and The optical film sheet is peeled from the substrate in such a manner that the cutting blade at the portion in contact with the optical film during the cutting is in the same direction as the relative movement direction of the cutting film with respect to the optical film. In the peeling method of the above configuration, it is preferable that the four end edges of the optical film sequentially form the first, second, third, and fourth end edges from one corner, and sandwich the one of the one corner The two end edges are the first and fourth end edges; the first and fourth end edges are such that the moving direction of the cutting blade at a portion in contact with the optical film becomes a direction away from the one corner It is cut and formed in such a manner that the peeling direction of the optical film at the first and fourth end edges and the moving direction of the cutting blade at the portion in contact with the optical film at the cutting become In the same direction, the optical film is peeled from the substrate using the one corner as a starting point for peeling. In the peeling method of the above configuration, it is preferable that the second end edge is cut such that the moving direction of the cutting blade in a portion in contact with the optical film becomes away from the first end edge Formed, and the third end edge is formed by being cut in such a manner that the moving direction of the cutting blade in the portion in contact with the optical film becomes away from the fourth end edge; following the first And the fourth edge, and the direction of the peeling of the optical film at the second and third edges and the direction of movement of the cutting blade at the portion in contact with the optical film during the cutting become the same The direction of the direction is to peel the optical film from the substrate with the one corner as a starting point for peeling. In the peeling method of the above configuration, it is feasible that the optical film is formed by cutting by the cutting blade rotating in the following manner: that is, the cutting of the portion that is in contact with the optical film during the cutting The moving direction of the cutting blade and the relative running direction of the cutting blade with respect to the optical film rotate in opposite directions. In the peeling method of the above configuration, it is feasible that the optical film is formed by cutting by the cutting blade rotating in the following manner: that is, the cutting of the portion that is in contact with the optical film during the cutting The moving direction of the broken blade and the relative running direction of the cutting blade with respect to the optical film rotate in the same direction. In the peeling method of the above configuration, it is possible that the optical film is formed by cutting the non-rotating cutting blade. In the peeling method of the above configuration, it is feasible that the optical film is a polarizing plate; and the optical film is a polarizing plate piece.

the following, The peeling method according to the embodiment of the present invention will be described with reference to the drawings.  First of all, The laminated body of the optical film to be peeled off in the peeling method of this embodiment will be described.  As shown in Figure 1 and Figure 2, The laminate 30 has: Rectangular substrate 31, And a rectangular optical film 33 on one surface 31a of the substrate 31.  The substrate 31 is formed larger than the optical film 33.  Examples of the substrate 31 include hard glass.  The optical film 33 is adhered to one surface (upper surface) 31a of the substrate 31 using a first adhesive (not shown). The optical film 33 has four end edges 34a adjacent to each other in the following order: 34b, 34c, 34d, The intersection of these end edges constitutes four corners 35a, 35b, 35c, 35d. in particular, The intersection of the first end 34a and the fourth end 34d constitutes a corner 35a, The intersection of the first end 34a and the second end 34b constitutes a corner 35b, The intersection of the second end 34b and the third end 34c forms a corner 35c, The intersection of the third end 34c and the fourth end 34d constitutes a corner 35d.  As the optical film 33, for example, a polarizing plate sheet, Phase difference diaphragm, Brightness enhancement film, etc.  Among others, In the case where, for example, the optical film 33 is the polarizing plate 33, As shown in Figure 3, in particular, The polarizing plate 33 includes, for example: Polarizer 41, Adhesive layers 43 with a second adhesive formed on both surfaces of the polarizer 41, And the protective film 45 laminated on the adhesive layers 43 respectively.  In addition, As above, 3 shows that the polarizing plate 33 has a polarizer 41, And the appearance of the protective film 45 laminated on its two sides, But in addition, It is also possible to use a polarizing plate 33 having a polarizer 41, And the appearance of the protective film 45 laminated on only one side thereof.  The thickness of the above optical film 33 is not particularly limited, Can be set appropriately. but, E.g, The smaller the thickness of the optical film 33, The strength decreases and the optical film 33 tends to break more easily, on the other hand, The greater the thickness, The strength increases and the optical film 33 tends to be less likely to break. thus, For example, the thickness of the optical film 33 is 200 μm or less, It is preferably below 90 μm, More preferably, when the thickness is 50 μm or less, the peeling method of this embodiment can be preferably applied. As such, even if the thickness is relatively small, the optical film 33 is not easily broken when peeled, Therefore, the peeling method of this embodiment becomes more useful.  also, The material of the optical film 33 is not particularly limited. but, As described later, The optical film 33 is a polarizing plate 33, The polarizing plate 33 is easily broken, Especially when the material of the protective film 45 in the polarizing plate 33 is easily broken, The peeling method of this embodiment can be preferably applied.  In the case where the optical film 33 is the polarizing plate 33 shown in FIG. 3, As the polarizer 41, by dyeing a polyvinyl alcohol-based film, The polarizer formed by extension.  The thickness of the polarizer 41 is usually about 2 to 30 μm.  As the first and second adhesives, previously known adhesives may be mentioned.  As the protective film 45, a cellulose resin containing triethyl cellulose, etc., may be mentioned. polyester resin, Polyether resin, Poly resin, Polycarbonate resin, Polyamide resin, Polyimide resin, Polyolefin resin, Methacrylic resin, Cyclic polyolefin resin (norbornene resin), Polyvinyl alcohol resin, Polystyrene resin, Polyvinyl alcohol resin, And other mixtures.  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 this embodiment, As above, The optical film 33 is adhered to the upper surface 31a of the substrate 31 using the first adhesive, The adhesive force of the optical film 33 to the substrate 31 (that is, the adhesive force of the first adhesive) is usually 5 to 15 N / 25 mm. If the adhesion is within this range, Then, the optical film 33 can be relatively firmly attached to the substrate 31. also, Even when peeling off the optical film 33 firmly adhered as described above, The cracking of the optical film 33 can still be suppressed. thus, The peeling method of this embodiment is suitable for the laminate 30 having the adhesive force within the above range.  The above-mentioned adhesive force system uses AUTOGRAPH (precision universal testing machine, (Shimadzu Corporation) The value measured by peeling the optical film 33 from the substrate 31 at a stretching speed of 300 mm / min in the direction of 90 °.  As shown in Figure 4 and Figure 5, The optical film 33 can be formed by cutting the band-shaped optical film 50 with the cutting blade 60. also, It is feasible, In the case where the optical film 33 is the polarizing plate 33, As the strip-shaped optical film 50, the polarizer 41, A strip-shaped laminated film (polarizing plate) 50 formed by laminating the adhesive layer 43 and the protective film 45, The optical film 33 is formed by cutting the laminated film with the cutting blade 60.  The peeling method of the present embodiment for peeling the optical film 33 from the laminate 30 is provided with a substrate 31, And the rectangular laminate 30 of the optical film 33 on one surface (upper surface) 31a of the substrate 31 peels the optical film 33; The optical film 33 is formed by cutting the optical film 50 with a cutting blade 60 that runs relatively to the optical film 50. And has four end edges 34a to 34d formed by the cutting;  With respect to the peeling direction of the optical film 33 at least one of the end edges 34a to 34d and the relative position of the cutting blade 60 with respect to the optical film 50 at the portion in contact with the optical film 50 during the cutting The direction of movement becomes the same direction, The optical film 33 is peeled off from the substrate 31.  in particular, According to the above-mentioned moving direction of the cutting blade 60 at the time of cutting for forming the end edges 34a to 34d (the relative moving direction of the cutting blade 60 at the portion in contact with the optical film 50 at the time of cutting relative to the optical film 50) ) Decided to strip off the starting point P, Then, the optical film 33 is peeled from the peeling starting point P.  Here, The above-mentioned moving direction of the cutting blade 60 at the portion in contact with the optical film 50 during the cutting is the moving direction when the cutting blade 60 at the time of cutting projects to the relative traveling direction with respect to the optical film 50. in particular, The moving direction may be toward the upstream side of the walking direction, Or indicate towards the downstream side.  E.g, The optical film 33 is formed into a rectangular shape as follows, And it has four end edges 34a to 34d. in particular, The strip-shaped optical film 50 is cut by a cutting blade 60 that runs relatively to the optical film 50 along its longitudinal direction to form an intermediate body. Furthermore, The intermediate body is cut by a cutting blade 60 that runs relative to the optical film 50 in the width direction of the optical film 50 (direction perpendicular to its longitudinal direction) to form the optical film 33.  The relative traveling method of the cutting blade 60 with respect to the optical film 50 is not particularly limited, Can be set appropriately. E.g, The following methods can be used, which is: Use a previously known mechanism to fix the optical film 50 (set to a non-walking state), Only make the cutting knife 60 walk, Or fixed cutting knife 60 (set to not walking), Only make the optical film 50 walk, Or, both the optical film 50 and the cutting blade 60 can be moved.  As the cutting blade 60, a flat blade having a blade portion at the straight edge, And a round knife with a blade at the peripheral edge of a round shape.  And, The cutting blade 60 may be a cutting blade that travels in a state where the blade portion does not rotate, It can also be a cutting knife that drives the blade while rotating or freely rotating.  As the cutting by the cutting blade 60 as described above, for example, the following three aspects may be mentioned.  Aspect (1): It can be exemplified by the state of being cut by a rotating knife rotating in the following manner, which is: The relative movement direction of the cutting blade 60 relative to the optical film 50 at the portion in contact with the optical film 50 is rotated in a direction opposite to the above-described running direction of the cutting blade 60. For the above-mentioned rotating blade, for example, a circular blade that rotates while rotating relative to the optical film 50 while rotating is used, Or use a freely rotating round knife that rotates relative to the optical film 50 (as described above, for example, as shown in Figure 5, Here, the rotation shown in FIG. 5 is called forward rotation).  Aspect (2): It can be exemplified by the state of being cut by a rotating knife rotating in the following manner, which is: The relative movement direction of the cutting blade 60 with respect to the optical film 50 at the portion in contact with the optical film 50 is rotated in the same direction as the above-described running direction of the cutting blade 60. For the above-mentioned rotating blade, for example, a round blade that rotates while rotating relative to the optical film 50 can be used. Here, the rotation shown in FIG. 9 is called reversal).  Aspect (3): For example, the state of being cut by the cutting blade 60 that travels relative to the optical film 50 in a non-rotating state (a knife that does not rotate as described above is shown in, for example, FIG. 11, Here, the cutting blade shown in FIG. 11 is called a fixed blade). As the above-mentioned cutting blade, a flat blade or a round blade may be mentioned.  The situation of aspect (1) is shown in Figure 5, When the cutting blade 60 cuts the optical film 50 while walking relative to the optical film 50, In the part of the cutting blade 60 that is in contact with the optical film 50, The blade portion is in the direction of travel relative to the optical film 50 (dotted arrows in FIG. 5, Right direction) The opposite direction (solid arrows in Figure 5, (Left direction) rotates relative to the optical film 50 so as to move relatively (forward rotation).  While walking, The cutting blade 60 scrapes in the direction opposite to the above-mentioned running direction and moves while cutting the optical film 50, Thereby, the optical film 50 is cut.  Burrs (small pieces) 71 are formed on the end edges 34a to 34d formed by this cutting as shown in FIG. 6, The burr (small piece portion) 71 protrudes outward in the direction opposite to the walking direction, that is, in the above-mentioned moving direction of the cutting blade 60 of the portion that contacts the optical film 50 during cutting. With this, Zigzag patterns are generated at the end edges 34a to 34d.  Here, If force is applied to the small piece portion 71 from the front end side toward the root side, Then the small part 71 is rolled up, Along with this rolling, the optical film 33 is easily broken. that is, If the optical film 33 is peeled off in the direction opposite to the zigzag pattern, Then, the optical film 33 is easily broken.  E.g, In Figure 6, If the optical film 33 is peeled from the corner 35c, Then, the peeling direction of the end edges 34a to 34d and the above-mentioned moving direction (solid arrow) of the cutting blade 60 at the portion that is in contact with the optical film 50 during cutting become opposite directions. thus, The tension applied to the optical film 33 at the time of peeling is against the above-mentioned zigzag pattern, The result is, Starting from this zigzag pattern, the optical film 33 is easily broken.  Compared to this, In Figure 6, If the optical film 33 is peeled off using the corner 35a as the peeling starting point P, Then, the peeling direction of the optical film 33 at the end edges 34a to 34d becomes the same direction as the above-mentioned moving direction (solid arrow) of the cutting blade 60 at the portion that contacts the optical film 50 at the time of cutting. thus, In this situation, The tension applied to the optical film 33 during peeling will not reverse the above-mentioned zigzag pattern, The result is, It is not easy to break with this zigzag pattern as a starting point. thus, By peeling off the optical film 33 as described above, In addition, it is possible to suppress the breakage of the optical film 33 during peeling.  In addition, In Figure 7, The optical film 33 cut as shown in FIG. 8 is also the same as the case of FIG. 6 described above, If the corner 35a is used as the peeling starting point P in FIG. 7, In FIG. 8, the optical film 33 is peeled off using the corner 35a (or corner 35c) as the peeling starting point P, It is not easy to break.  The situation of aspect (2) is shown in Figure 9, When the cutting blade 60 cuts the optical film 50 while walking relative to the optical film 50, In the part of the cutting blade 60 that is in contact with the optical film 50, The blade portion is in the direction of travel relative to the optical film 50 (dotted arrows in FIG. 9, Right direction) The same direction (solid arrows in Figure 9, Rotates (reverses) so as to move relative to the optical film 50 in the right direction).  While walking, The cutting blade 60 scrapes in the above-mentioned running direction and moves while cutting the optical film 50 in the thickness direction, Thereby, the optical film 50 is cut.  Burrs (small pieces) 71 are formed on the end edges 34a to 34d formed by this cutting as shown in FIG. 10, The thorn (small portion) 71 protrudes outward in the traveling direction, that is, in the above-mentioned moving direction of the cutting blade 60 of the portion that contacts the optical film 50 at the time of cutting. With this, Zigzag patterns are generated at the end edges 34a to 34d.  Here, If a force is applied to the small piece portion 71 from the front end side toward the root side as described above, Then the small part 71 is rolled up, Along with this rolling, the optical film 33 is easily broken. that is, If the optical film 33 is peeled off in the direction opposite to the zigzag pattern, Then, the optical film 33 is easily broken.  In this aspect, In, for example, Figure 10, If the optical film 33 is peeled from the corner 35c, Then, the peeling direction of the end edges 34a to 34d and the above-mentioned moving direction (solid arrow) of the cutting blade 60 at the portion that is in contact with the optical film 50 during cutting become opposite directions. thus, The tension applied to the optical film 33 at the time of peeling is against the above-mentioned zigzag pattern, The result is, Starting from this zigzag pattern, the optical film 33 is easily broken.  Compared to this, In Figure 10, If the optical film 33 is peeled off using the corner 35a as the peeling starting point P, Then, the peeling direction of the optical film 33 at the end edges 34a to 34d becomes the same direction as the above-mentioned moving direction (solid arrow) of the cutting blade 60 at the portion that contacts the optical film 50 during cutting. thus, In this situation, The tension applied to the optical film 33 during peeling will not reverse the above-mentioned zigzag pattern, The result is, It is not easy to break with this zigzag pattern as a starting point. thus, By peeling off the optical film 33 as described above, In addition, it is possible to suppress the breakage of the optical film 33 during peeling.  The situation of aspect (3) is shown in Figure 11, When walking relative to the optical film 50, At the portion where the non-rotating cutting blade 60 contacts the optical film 50, The blade is in the direction of travel relative to the optical film 50 (dotted arrows in FIG. 11, Right direction) The same direction (solid arrows in Figure 11, (Right direction) relatively moves (fixes) relative to the optical film 50.  While walking, The cutting blade 60 scrapes in the above-mentioned running direction and moves while cutting the optical film 50, Thereby, the optical film 50 is cut.  Burrs (small pieces) 71 are formed on the end edges 34a to 34d formed by the cutting as shown in FIG. 12, The burr (small piece portion) 71 protrudes outward in the traveling direction, that is, in the above-mentioned moving direction of the cutting blade 60 of the portion that contacts the optical film 50 at the time of cutting. With this, Zigzag patterns are generated at the end edges 34a to 34d.  Here, If a force is applied to the small piece portion 71 from the front end side toward the root side as described above, Then the small part 71 is rolled up, Along with this rolling, the optical film 33 is easily broken. that is, If the optical film 33 is peeled off in the direction opposite to the zigzag pattern, Then, the optical film 33 is easily broken.  In this aspect, In, for example, Figure 12, If the optical film 33 is peeled from the corner 35c, Then, the peeling direction of the end edges 34a to 34d and the above-mentioned moving direction (solid arrow) of the cutting blade 60 at the portion that is in contact with the optical film 50 during cutting become opposite directions. thus, The tension applied to the optical film 33 at the time of peeling is against the above-mentioned zigzag pattern, The result is, Starting from this zigzag pattern, the optical film 33 is easily broken.  Compared to this, In Figure 12, If the optical film 33 is peeled off using the corner 35a as the peeling starting point P, Then, the peeling direction of the optical film 33 at the end edges 34a to 34d becomes the same direction as the above-mentioned moving direction (solid arrow) of the cutting blade 60 at the portion that contacts the optical film 50 at the time of cutting. thus, In this situation, The tension applied to the optical film 33 during peeling will not reverse the above-mentioned zigzag pattern, The result is, It is not easy to break with this zigzag pattern as a starting point. thus, By peeling off the optical film 33 as described above, In addition, it is possible to suppress the breakage of the optical film 33 during peeling.  also, As shown in the above aspects (1) to (3), In the stripping method of this embodiment, Preferably,  At least the first and fourth end edges 34a of the optical film 33, 34d is formed by being cut in such a manner that the above-mentioned moving direction of the cutting blade 60 in the portion in contact with the optical film 50 becomes away from the one corner 35a;  At the first and fourth end edges 34a, The way in which the peeling direction of the optical film 33 of 34d faces the same direction as the moving direction of the cutting blade 60 in contact with the optical film 50 at the time of cutting, The optical film 33 is peeled from the substrate 31 with the corner 35a as the peeling starting point P.  In addition, The direction away from the corner 35a corresponds to the direction opposite to the corner 35a. More specifically, In the first edge 34a, The direction away from the corner 35a corresponds to the direction toward the corner 35b opposite to the corner 35a, In the fourth edge 34d, The direction away from the corner 35a corresponds to the direction toward the corner 35d opposite to the corner 35a.  in this way, If the optical film 33 is peeled off using the corner 35a as the peeling starting point P, Then at least the first and fourth end edges 34a immediately after the peeling starts, 34d, The optical film 33 can be peeled in such a manner that the peeling direction of the optical film 33 faces the same direction as the above-mentioned moving direction of the cutting blade 60 in the portion in contact with the optical film 50, With this, It is possible to suppress the breakage of the optical film 33 at the time of peeling.  thus, The optical film 33 can be peeled off more surely while suppressing the breakage of the optical film 33.  Furthermore, As shown in the above aspects (1) to (3), In the stripping method of this embodiment, Even better,  The second end edge 34b of the optical film 33 is formed by being cut in such a manner that the above-mentioned moving direction of the cutting blade 60 in the portion in contact with the optical film 50 becomes away from the first end edge 34a. And the third end edge 34c is formed by being cut in such a manner that the above-mentioned moving direction of the cutting blade 60 in contact with the optical film 50 becomes away from the fourth end edge 34d;  Following the first and fourth end edges 34a, 34d, Furthermore, at the second and third end edges 34b, 34c The way in which the peeling direction of the optical film 33 and the above-mentioned moving direction of the cutting blade 60 in the part that contacts the optical film 50 at the time of cutting becomes the same direction, The optical film 33 is peeled from the substrate 31 with the corner 35a as the peeling starting point P.  In this situation, Not only the first and fourth end edges 34a immediately after the peeling starts, In 34d, At the second and third end edges 34b, which are continuous with each other, The same is true in 34c, The optical film 33 can be peeled in the same direction as the above-mentioned moving direction of the cutting blade 60 of the portion that is in contact with the optical film 50 at the time of cutting. With this, The breakage of the optical film 33 at the time of peeling can be more suppressed.  thus, The optical film 33 can be further reliably peeled off while suppressing the breakage of the optical film 33.  In addition, Even if not in all four end edges 34a to 34d as above, The peeling direction of the optical film 33 is the same direction as the above-mentioned moving direction of the cutting blade 60 at the part that contacts the optical film 50 at the time of cutting, As long as it is tied to at least one of the four end edges 34a to 34d, The peeling direction of the optical film 33 and the above-mentioned moving direction of the cutting blade 60 of the portion that is in contact with the optical film 50 during cutting may be the same direction. And, If in more of the four end edges 34a to 34d, The peeling direction of the optical film 33 is the same direction as the above-mentioned moving direction of the cutting blade 60 in contact with the optical film 50 at the time of cutting, Then, it is possible to more suppress the breakage of the optical film 33 during peeling.  For the preferred peeling device 1 used in the peeling method of this embodiment, The description will be made with reference to FIGS. 13 to 16. In addition, 13 to 16 show the state where the optical film 33 is peeled off from the substrate 31 with the corner portion 35a as the peeling start point P.  As shown in figure 13, And as shown in Figure 14, The peeling device 1 of this embodiment includes: Stage member 3, It carries the laminate 30; Roll-shaped peeling auxiliary member 7; And peeling member 5, It holds the corner 35a of the optical film 33 peeled from the laminate 30 and peeled by the peeling auxiliary member 7, The optical film 33 is further peeled off in sequence.  More specifically, The peeling device 1 of this embodiment includes the following peeling member 5 as the peeling member 5, which is: The corner 35a of the optical film 33 wound around the optical film 33 peeled from the laminate 30 and bent by the peeling auxiliary member 7, Furthermore, the optical film 33 is further peeled off while being rotated while being rotated.  The stage member 3 is a stage on which the layered body 30 is placed until all the optical films 33 have been peeled from the layered body 30.  The peeling auxiliary member 7 peels off the optical film 33 from the substrate 31, Moreover, the stripped optical film 33 is curved to guide it toward the rear end side. As the above-mentioned peeling auxiliary member 7, a roller body may be mentioned.  The peeling member 5 winds the corner 35a of the peeled optical film 33, In this state, the optical film 33 is further peeled off while being rotated while being rotated.  As the peeling member 5 as described above, for example, a drum or the like that rotates when driven by a drive device 17 such as a motor may be mentioned.  And, In the peeling member 5, The corner portion 35a of the peeled optical film 33 is fixed with adhesive tape (not shown) or the like.  In addition, In Figure 13, The optical film 33 is peeled from the substrate 31 together with the first adhesive (not shown).  In this embodiment, The peeling device 1 is used to peel off the corner portion 35a of the optical film 33 from the laminate 30, The peeled portion is guided toward the rear end side while being bent by the peeling auxiliary member 7, 与 Wind up to the peeling member 5. In this state, By rotating the peeling member 5, The optical film 33 is sequentially peeled off from the substrate 31 and wound up.  The so-called peeling of the corner portion 35a of the optical film 33 from the laminate 30 is performed as follows, for example. in particular, The operator grasps the peeling knife (not shown) etc. which has a blade part at the front end with his finger, The corner 35a of the optical film 33 is peeled by inserting the above-mentioned peeling blade between the substrate 31 of the laminate 30 and the corner 35a of the optical film 33. More specifically, The operator inserts the peeling blade between the first adhesive (not shown) and the substrate 31 on the surface 33b of the optical film 33 on the substrate 31 side, Then, the optical film 33 is peeled together with the first adhesive.  also, The operator wraps the corner portion 35a of the peeled optical film 33 around the peeling member 5 by, for example, as follows. in particular, The operator performs the above-mentioned winding by winding the corner portion 35a of the peeled optical film 33 around the peripheral surface of the peeling member 5 and fixing it to the peripheral surface with adhesive tape (not shown) or the like.  then, From the state shown in FIG. 14, if the optical film 33 is further peeled off while the peeling member 5 is further peeled off, Then further peel off the optical film 33, As the divestiture proceeds, As shown in Figure 15, And as shown in Figure 16, The laminate 30 faces the side opposite to the peeling direction X (see FIG. 15, And the hollow arrows in Fig. 16) move sequentially. that is, The laminate 30 relatively moves with respect to the stage member 3. More specifically, The laminate 30 slides on the stage member 3. As shown in Figure 16, If all the optical films 33 are finally peeled off and the substrate 31 is completely exposed, Then, the laminate 30 stops moving.  in this way, The optical film 33 is peeled from the laminate 30.  in this way, 13 to 16 show how the optical film 33 is peeled off from the corner 35a, However, in the case of peeling from the other corners 35b to 35d, the optical film 33 can be peeled off from the substrate 31 in the same manner.  In the stripping step of this embodiment, It is feasible, As mentioned before,  The optical film 33 is formed by cutting the band-shaped optical film 50 with the cutting blade as described above;  The laminated body 30 is formed by attaching the formed optical film 33 on one surface 31a of the substrate 31;  The self-formed laminate 30 peels off the optical film 33 as described above.  also, The method of manufacturing the optical film including the following steps can be implemented using the peeling step of this embodiment:  The step of forming the optical film 33 by cutting the band-shaped optical film 50 with the cutting blade as described above;  The step of forming the laminated body 30 by attaching the formed optical film 33 on one surface 31a of the substrate 31;  The step of peeling the optical film 33 from the formed layered body 30 as described above.  In addition, The manufacturing method of the optical film may include the step of following another new optical film 33 on the aforementioned one surface 31a of the substrate 31 from which the optical film 33 is peeled off.  As above, The peeling method of this embodiment is provided with a substrate 31, And the rectangular laminate 30 of the optical film 33 on one surface 31a of the substrate 31 peels off the optical film 33; The optical film 33 is formed by cutting the optical film 50 with a cutting blade 60 that runs relatively to the optical film 50. And has four end edges 34a to 34d formed by the cutting;  With respect to the peeling direction of the optical film 33 at least one of the four end edges 34a to 34d and the portion of the cutting blade 60 that is in contact with the optical film 50 during the cutting, the cutting blade 60 is opposed to the optical film 50 The relative movement direction becomes the same direction, The optical film 33 is peeled off from the substrate 31.  According to the above structure, At least one of the four end edges 34a to 34d, The optical film 33 can be peeled off without the zigzag pattern generated when the optical film 33 is peeled off without cutting against the cut of the optical film 50. With this, The cracking of the optical film 33 starting from the zigzag pattern can be suppressed.  thus, The optical film 33 can be peeled off while suppressing the breakage of the optical film 33. And, Even if the adhesive sheet is not attached to the optical film 33, the breakage can be suppressed, So stripping is for simplicity.  thus, The optical film 33 can be easily peeled from the substrate 31 while suppressing cracking of the optical film 33.  also, In the stripping method of this embodiment, Preferably,  The four end edges 34a to 34d of the aforementioned optical film 33 are in order from the one corner 35a to the first 2nd, The third and fourth end edges 34a, 34b, 34c, 34d, And between the two end edges of the one corner 35a is the first and fourth end edges 34a, 34d;  The first and fourth end edges 34a, 34d is formed by being cut in such a manner that the moving direction of the cutting blade 60 in the portion in contact with the optical film 50 is away from the one corner 35a;  So that at the aforementioned first and fourth end edges 34a, 34d, the peeling direction of the optical film 33 and the direction of the movement of the cutting blade 60 in the portion that is in contact with the optical film 50 during the cutting become the same direction, The optical film 33 is peeled from the substrate 31 using the one corner 35a as a peeling starting point P.  According to the above structure, If the optical film 33 is peeled off using the one corner 35a as the peeling starting point P, Then at least the first and fourth end edges 34a immediately after the peeling starts, 34d, It is possible to peel off the optical film 33 in such a manner that the peeling direction of the optical film 33 faces the same direction as the above-mentioned moving direction of the cutting blade 60 of the portion in contact with the optical film 50 at the time of cutting, With this, It is possible to suppress the breakage of the optical film 33 at the time of peeling.  thus, The optical film 33 can be peeled off more surely while suppressing the breakage of the optical film 33.  also, In the stripping method of this embodiment,  The second end edge 34b is formed by being cut so that the moving direction of the cutting blade 60 in the portion in contact with the optical film 50 is away from the first end edge 34a. And the third end edge 34c is formed by being cut in such a manner that the moving direction of the cutting blade 60 in the portion in contact with the optical film 50 is away from the fourth end edge 34d;  Following the aforementioned first and fourth end edges 34a, 34d, Furthermore, at the second and third end edges 34b, 34c The way in which the peeling direction of the optical film 33 and the moving direction of the cutting blade 60 in the portion in contact with the optical film 50 during the cutting are the same direction, The optical film 33 is peeled from the substrate 31 using the one corner 35a as a peeling starting point P.  According to the above structure, If the optical film is peeled off using the one corner 35a as the starting point for peeling, Not just the first and fourth end edges 34a immediately after the peeling starts, In 34d, At the second and third end edges 34b, which are continuous with each other, The same is true in 34c, The optical film 33 can be peeled in the same direction as the above-mentioned moving direction of the cutting blade 60 of the portion that is in contact with the optical film 50 at the time of cutting. With this, It is possible to suppress the breakage of the optical film 33 at the time of peeling.  thus, The optical film 33 can be further reliably peeled off while suppressing the breakage of the optical film 33.  In the stripping method of this embodiment, It is feasible,  The optical film 33 is formed by cutting by the cutting blade 60 rotating as follows, which is: The moving direction of the cutting blade 60 and the traveling direction of the cutting blade 60 relative to the optical film 50 in the portion in contact with the optical film 50 during the cutting are rotated in opposite directions.  also, In the stripping method of this embodiment, It is feasible,  The optical film 33 is formed by cutting by the cutting blade 60 rotating as follows, which is: The moving direction of the cutting blade 60 at the portion in contact with the optical film 50 during the cutting is rotated in such a manner that the relative traveling direction of the cutting blade 60 relative to the optical film 50 becomes the same direction.  In the stripping method of this embodiment, It is feasible,  The optical film 33 is formed by cutting the non-rotating cutting blade 60.  In the stripping method of this embodiment, It is feasible,  The aforementioned optical film 50 is a polarizing plate 50;  The aforementioned optical film 33 is a polarizing plate 33.  According to the above structure, Due to the special expectation of thinning, And when peeling off the polarizing plate 33 that tends to break during peeling, The polarizing plate piece 33 can be easily peeled from the substrate 31 while suppressing its breakage, Therefore, the peeling method of this embodiment becomes more useful.  As above, According to the present embodiment, there is provided a peeling method that can easily peel off the optical film 33 from the substrate 31 while suppressing the breakage of the optical film 33.  The peeling method of this embodiment is as described above, However, the peeling method of the present invention is not limited to the above embodiment.  E.g, In the above embodiment, The cutting blade 60 with one blade is shown. however, In addition, In the present invention, the following aspects can be adopted as shown in FIG. 17, which is: Use a cutting machine as the cutting blade 60, The cutting mechanism is such that the circular upper blade 60a and the lower blade 60b rotate while facing each other with their outer peripheral edges facing each other. Then, the optical film 50 inserted between the upper blade 60a and the lower blade 60b is cut. In the case of using the above-mentioned cutting machine, At the part that contacts the optical film 50 at the time of cutting, Since the two blades move in the same direction, Therefore, it is only necessary to determine the peeling start point in the same manner as in the above-described embodiment based on the moving direction. In addition, Fig. 17 shows the forward rotation of the cutting machine, However, the upper blade 60a and the lower blade 60b of the cutting machine may rotate (reverse) in the reverse direction as shown in FIG. In addition, the upper blade 60a and the lower blade 60b of the cutting machine may not rotate.  Secondly, The embodiment is shown on one side, The present invention will be described in more detail.  [Example] As the optical film 33, the polarizing plate 33 (thickness: About 100 μm). As the laminate 30, a laminate 30 formed by laminating a protective film 45 of the polarizing plate sheet 33 through the first adhesive on the substrate 31 is used.  More specifically, By stacking the protective film 45 on both surfaces of the polarizer 41 through the adhesive layer 43 having the second adhesive, A separator (not shown) is deposited on one of the protective films 45 via the first adhesive, A commercial product formed by laminating a surface protective film (not shown) on another protective film 45 via a third adhesive (TEG1465DU, Nitto Denko Co., Ltd.) peeling off the separator and stacking it on the substrate 31, after that, Peel the surface protection film together with the third adhesive, The laminate 30 is formed.  also, The polarizing plate 33 is formed as follows. in particular, Using a cutting machine with two circular knives that cross each other, ie the cutting knife 60, As shown in FIG. 17, the cutting blade 60 is driven to rotate in a forward rotation, And in a state of being fixed and not walking, By running the strip-shaped polarizing plate 50 and cutting it, This forms an intermediate. The two end edges formed by the cutting correspond to the end edges 34a along the longitudinal direction of the polarizing plate 33, 34c. As a result of this cutting, as shown in FIG. 18, at the edge 34a, 34c forms a small piece portion 71 that is inclined and protruding toward the right in FIG. 18, This forms a zigzag pattern.  Secondly, Use a cutting knife with a round knife as the cutting knife 60, The cutting blade 60 cuts the above-mentioned intermediate body in a state of being fixed but not running (at rest) by walking while being driven to rotate in a forward rotation as shown in FIG. 9, Thereby, the polarizing plate piece 33 is formed. The two edges formed by the cutting correspond to the edge 34b along the short side of the polarizing plate 33, 34d. Due to this cutting, at the end edge 34b, 34d is formed with a saw-tooth pattern that is inclined and protruding toward the upper direction of FIG. 18. FIG. 19 shows a photo of one edge of the polarizing plate 33 at this time, FIG. 20 shows a partially enlarged view of FIG. 19.  Use Figure 13, And the peeling device 1 shown in FIG. 14, The polarizing plate pieces 33 are peeled from the laminated body 30 toward the corners located at the diagonal corners of the laminate 30 using the corners 35a to 35d as peeling starting points PA to PD, respectively. Visually observe the cracked state of the polarizing plate 33 at this time.  and, In each peeling, The case where the polarizing plate piece 33 is not cracked is indicated as "OK" as being able to peel off well, The case where the polarizing plate piece 33 is broken is indicated as "NG" because it cannot be peeled off well. This was repeated 10 times (Experimental Examples 1 to 10), The percentage of the number of experimental examples where the peeling was successfully completed in 10 times was calculated as the peeling success rate. The results are shown in Table 1.  In addition, The peeling direction using the corner 35a as the peeling starting point PA from the corner 35a toward the diagonal corner 35c is set as the peeling direction A.  The peeling direction using the corner 35b as the peeling starting point PB from the corner 35b toward the diagonal corner 35d is set as the peeling direction B.  The peeling direction from the corner 35c to the corner 35a located at the opposite corner with the corner 35c as the peeling starting point PC is set as the peeling direction C.  The peeling direction D from the corner 35d toward the corner 35b located at the opposite corner with the corner 35d as the peeling starting point PD is set as the peeling direction D.  [Table 1] As shown in Table 1, It can be seen: Among the four end edges 34a to 34d, The greater the number of edges in the direction in which the peeling direction of the polarizing plate piece 33 and the relative moving direction of the cutting blade 60 with respect to the polarizing plate 50 at the portion that contacts the polarizing plate 50 during cutting, The more the cracking of the polarizing plate 33 at the time of peeling is suppressed.  that is, It can be seen: The greater the number of end edges in which the peeling direction of the optical film 33 and the relative moving direction of the cutting blade 60 with respect to the optical film 50 at the portion in contact with the optical film 50 during cutting are greater, The more the breakage of the optical film 33 during peeling is suppressed.  As described above, the embodiments and examples of the present invention have been described, However, the features of the respective embodiments and examples may be appropriately combined at the beginning. And, What should be considered is, The embodiments and examples disclosed this time are examples in all points, Not restrictive. The scope of the present invention is not indicated by the above-mentioned embodiments and examples but by the scope of patent application, It also intends to include any changes within the meaning and scope equivalent to the scope of patent application.  [Cross-reference of related applications] The present application claims the priority of Japanese invention patent application 2016-151869 filed on August 2, 2016, The content is incorporated into the description of the specification of the present invention by reference.

1‧‧‧Stripping device
3‧‧‧ stage components
5‧‧‧Stripping member
7‧‧‧Stripping auxiliary components
30‧‧‧Layered body
31‧‧‧ substrate
31a‧‧‧ noodles
33‧‧‧Optical diaphragm
33a‧‧‧upper surface
33b‧‧‧ noodles
34a‧‧‧End edge / 1st end edge
34b‧‧‧End edge / 2nd end edge
34c‧‧‧End edge / 3rd end edge
34d‧‧‧End edge / 4th end edge
35a‧‧‧corner
35b‧‧‧corner
35c‧‧‧Corner
35d‧‧‧corner
41‧‧‧ Polarizer
43‧‧‧ Adhesive layer
45‧‧‧Protection film
50‧‧‧Optical film
60‧‧‧Cutting knife
60a‧‧‧sword
60b‧‧‧sword
71‧‧‧Burr / Small Department
A‧‧‧Stripping direction
B‧‧‧Stripping direction
C‧‧‧Stripping direction
D‧‧‧Stripping direction
P‧‧‧Stripping start point
PA‧‧‧Starting point
PA‧‧‧Starting point
PC‧‧‧Stripping start point
PD‧‧‧Stripping start point
X‧‧‧Stripping direction

FIG. 1 is a schematic plan view showing a laminated body to which the peeling method of this embodiment is applied. FIG. 2 is a schematic side view showing an example of the layer structure of the laminate of FIG. 1. 3 is a schematic side view showing an example of the layer configuration of the optical film in the laminate of FIG. 1. 4 is a schematic perspective view showing an aspect of cutting an optical film. FIG. 5 is a schematic side view showing an aspect of the rotation direction (forward rotation) and the traveling direction of the cutting blade when cutting the optical film. FIG. 6 is a schematic plan view schematically showing the shape of the zigzag pattern generated on the edge of the optical film due to the cutting of FIG. 5. FIG. 7 is a schematic view showing one aspect of the rotation direction (forward rotation) and the traveling direction of the cutting blade when cutting the optical film in the state where the cutting blade travels in another traveling direction and cuts the optical film Side view. FIG. 8 is a schematic view showing one aspect of the rotation direction (forward rotation) and the traveling direction of the cutting blade when cutting the optical film in the state where the cutting blade travels in another traveling direction and cuts the optical film Side view. Fig. 9 is a schematic side view showing one aspect of the rotation direction (reverse rotation) of the cutting blade and the running direction when cutting the optical film. FIG. 10 is a schematic plan view schematically showing the shape of the zigzag pattern generated at the edge of the optical film due to the cut of FIG. 9. Fig. 11 is a schematic side view showing an aspect of a traveling direction of a cutting blade (fixed) when cutting an optical film. FIG. 12 is a schematic plan view schematically showing the shape of the zigzag pattern generated at the edge of the optical film due to the cutting of FIG. 11. 13 is a schematic plan view showing a state in which the optical film peeled from the peeling starting point is wound around the peeling device used in the peeling method of the present embodiment. FIG. 14 is a schematic side view showing a state in which the optical film peeled from the peeling start point is wound around the peeling device used in the peeling method of this embodiment. FIG. 15 is a schematic side view showing a state in which the peeled optical film is sequentially wound while the optical film is further peeled off while the winding member is rotated. 16 is a schematic side view showing a state where the optical film is completely peeled off by the rotation of the winding member. FIG. 17 shows an aspect of the rotation direction (forward rotation) and the traveling direction of the cutting blade when the optical film is cut using the cutting blade used in one embodiment of the present invention to cut the optical film. Sketchy side view. Fig. 18 is a schematic side view showing the rotation direction (forward rotation) of the cutting blade when cutting the optical film, the running direction, and the peeling direction during the peeling of the optical film of the embodiment. FIG. 19 is a photograph partially enlarged from the side direction to show the sawtooth pattern generated on the edge of the optical film of the embodiment. FIG. 20 is a photograph showing a part of the area where the zigzag pattern of FIG. 19 is generated further enlarged.

33‧‧‧Optical diaphragm

34a‧‧‧End edge / 1st end edge

34b‧‧‧End edge / 2nd end edge

34c‧‧‧End edge / 3rd end edge

34d‧‧‧End edge / 4th end edge

35a‧‧‧corner

35b‧‧‧corner

35c‧‧‧Corner

35d‧‧‧corner

71‧‧‧Burr / Small Department

P‧‧‧Stripping start point

Claims (7)

A peeling method that peels off the optical film from a rectangular laminated body provided with a substrate and an optical film attached to one surface of the substrate; and the optical film runs relative to the optical film The cutting blade is formed by cutting the optical film, and has four edges formed by the cutting; the peeling direction of the optical film at least one of the four edges and the When the cutting blade is in contact with the optical film at the time of breaking, the optical film sheet is peeled from the substrate so that the relative movement direction of the cutting blade with respect to the optical film becomes the same direction. The peeling method according to claim 1, wherein the four end edges of the optical film are the first, second, third, and fourth end edges in order from one corner, and the two end edges of the one corner are sandwiched Is the first and fourth end edges; the first and fourth end edges are cut in such a manner that the moving direction of the cutting blade in the portion in contact with the optical film becomes a direction away from the one corner Formed by breaking; the peeling direction of the optical film at the first and fourth end edges and the direction of the movement of the cutting blade at the portion in contact with the optical film during the cutting become the same direction In this manner, the optical film is peeled from the substrate using the one corner as a peeling starting point. The peeling method according to claim 2, wherein the second end edge is formed by being cut in such a manner that the moving direction of the cutting blade in the portion in contact with the optical film becomes away from the first end edge, And the third end edge is formed by being cut in such a manner that the moving direction of the cutting blade in the portion in contact with the optical film becomes away from the fourth end edge; following the first and fourth ends The edge of the edge of the optical film at the second and third edges and the direction of movement of the cutting blade at the portion in contact with the optical film during the cutting become the same direction , Peeling the optical film from the substrate using the one corner as a starting point for peeling. The peeling method according to any one of claims 1 to 3, wherein the optical film is formed by cutting with the cutting blade rotating in the following manner, that is, a portion that contacts the optical film during the cutting The moving direction of the cutting blade and the relative traveling direction of the cutting blade with respect to the optical film rotate in opposite directions. The peeling method according to any one of claims 1 to 3, wherein the optical film is formed by cutting with the cutting blade rotating in the following manner, that is, a portion that contacts the optical film during the cutting The moving direction of the cutting blade and the relative running direction of the cutting blade with respect to the optical film rotate in the same direction. The peeling method according to any one of claims 1 to 3, wherein the optical film is formed by cutting the non-rotating cutting blade. The peeling method according to any one of claims 1 to 6, wherein the optical film is a polarizing plate; and the optical film is a polarizing plate piece.