Laminated film stripping method and stripping device thereof

Abstract

Provided is a method for reliably peeling a second film from a first film using a peeling operation sheet. In a method for peeling a second film (2) of a laminated film (A) from a first film (1), an operation sheet (5) for peeling is adhered to the surface of the second film (2), and the operation sheet (5) for peeling has: an adhesion region (6) that overlaps the surface of the second film (2) and adheres to the surface of the second film (2); a non-adhesive region (7) integrally connected to the adhesive region (6) and extending and protruding further outward than the first side (2a) of the second film (2); and a first edge (7a) of the non-adhesive region (7) extending obliquely with respect to the first edge (2a) of the second film (2), and an outer end portion (71) of the non-adhesive region (7) is sandwiched and shifted toward the first edge (7a) side, thereby generating a peeling starting point (S) between the second film (2) and the first film (1).

Description

Technical Field

[0001] The present invention relates to a method and an apparatus for peeling a second film from a first film in a laminated film having a first film and a second film. Background Art

[0002] In a laminated film in which two or more films are laminated, a peeling operation piece is adhered to the film, and one film is peeled using the peeling operation piece.

[0003] For example, the following is disclosed in

[0081] to

[0083] of Patent Document 1. A part of a guiding member is pasted to an end portion of a release film, another part of the guiding member extends outward from the release film, the other part of the guiding member is clamped by a clamping unit, folded back so that the orientation of the clamping unit is reversed by 180 degrees, and the guiding member is pulled out to a specified position, thereby peeling the release film from the polarizing plate.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2009-115759 Summary of the Invention

[0007] However, in the case of suddenly reversing the guiding member (peeling operation piece) by 180 degrees and pulling it out as in Patent Document 1, there is a risk that the peeling film cannot be peeled. That is, in the method of Patent Document 1, there is a risk of peeling failure of the peeling film.

[0008] Technical Problem to be Solved by the Invention

[0009] An object of the present invention is to provide a method and an apparatus capable of reliably peeling a second film from a first film using a peeling operation piece.

[0010] Technical Solution for Solving the Technical Problem

[0011] A method for peeling a laminated film according to a first aspect is as follows. The laminated film has a first film and a second film laminated on the first film in a peelable manner. The second film of the laminated film is peeled from the first film. A peeling operation piece is adhered to the surface of the second film. The peeling operation piece has: an adhesion region that overlaps the surface of the second film and adheres to the surface of the second film; a non-adhesion region that is integrally connected to the adhesion region and extends outward beyond a first side of the second film; and a first edge of the non-adhesion region that extends obliquely with respect to the first side of the second film, clamps an outer end portion of the non-adhesion region, and offsets the outer end portion of the non-adhesion region toward the first edge side, thereby generating a peeling start point between the second film and the first film.

[0012] The peeling method of the laminated film of the second method is that, in the peeling method of the first method described above, the outer end portion of the non-adhesive region is offset toward the first edge side along a plane parallel to the surface of the second film.

[0013] The peeling method of the laminated film of the third method is that, in the peeling method of the first or second method described above, the outer end portion of the non-adhesive region is rotationally moved along a plane parallel to the surface of the second film.

[0014] The peeling method of the laminated film of the fourth method is that, in any one of the peeling methods of the first to third methods described above, the outer end portion of the non-adhesive region is moved in a direction away from the surface of the second film while being rotationally moved along a plane parallel to the surface of the second film.

[0015] The peeling method of the laminated film of the fifth method is that, in any one of the peeling methods of the first to fourth methods described above, the outer end portion of the non-adhesive region is moved toward the second film side while being rotationally moved along a plane parallel to the surface of the second film.

[0016] The peeling method of the laminated film of the sixth method is that, in any one of the peeling methods of the first to fifth methods described above, the angle formed by the first edge of the non-adhesive region and the first side of the second film is an acute angle.

[0017] The peeling method of the laminated film of the seventh method is that, in any one of the peeling methods of the first to sixth methods described above, the second film has a second side extending in a direction orthogonal to the first side, and the adhesive region of the peeling operation piece adheres to the vicinity of the corner portion defined by the first side and the second side of the second film.

[0018] The peeling method of the laminated film of the eighth method is that, in any one of the peeling methods of the first to seventh methods described above, after the peeling start point is generated, the non-adhesive region is inverted and pulled out along the surface of the second film.

[0019] The peeling method of the laminated film of the ninth method is that, in the peeling method of the sixth method described above, the second film is rectangular, the adhesive region of the peeling operation piece adheres to the vicinity of the corner portion of the second film, and the non-adhesive region is inverted and pulled out along the diagonal direction of the second film.

[0020] According to another aspect of the present invention, a peeling device for a laminated film is provided.

[0021] The peeling device for the laminated film is a device for implementing any one of the peeling methods of the first to ninth methods described above, and has a chuck portion that clamps the outer end portion of the peeling operation piece and a driving portion that moves the chuck portion.

[0022] Advantages of the Invention

[0023] According to the method of the present invention, the second film can be reliably peeled off from the first film. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a top view of the laminated film.

[0025] Figure 2 is a schematic side view showing the layer structure of the laminated film of an example.

[0026] Figure 3 is a schematic side view showing the layer structure of the laminated film of another example.

[0027] Figure 4 is a top view of the laminated film with the peeling operation piece adhered thereto.

[0028] Figure 5 is an enlarged Figure 4 main part enlarged top view of the V-V portion.

[0029] Figure 6 is from Figure 4 main view of the laminated film observed from the arrow VI direction.

[0030] Figure 7 In (a) of , it is a main part enlarged top view of another example of the bonding part of the adhesion area of the peeling operation piece, (b) is a main part enlarged top view of another other example of the bonding part of the adhesion area of the peeling operation piece, and (c) is a main part enlarged top view of another other example of the bonding part of the adhesion area of the peeling operation piece.

[0031] Figure 8 is a top view of the workbench.

[0032] Figure 9 is a perspective view schematically showing the process of adhering the peeling operation piece to the laminated film.

[0033] Figure 10 is a main part enlarged top view showing the state where the outer end portion of the peeling operation piece is clamped by the chuck portion.

[0034] Figure 11 is a perspective view schematically showing this state.

[0035] Figure 12 is a main part enlarged top view showing the state where the outer end portion of the peeling operation piece is rotated toward the first edge side in the peeling method of the first embodiment.

[0036] Figure 13 is from Figure 12 side view observed from the arrow XIII direction of .

[0037] Figure 14 is a perspective view showing a state in which the outer end portion is rotated toward the first edge side with reference to the ground.

[0038] Figure 15 is a perspective view showing the process of pulling out the peeling operation piece with reference to the ground.

[0039] Figure 16 is a top view showing a state in which the peeling operation piece is pulled out in the diagonal direction of the second film while being reversed.

[0040] Figure 17 is an enlarged main part top view showing a state in which the outer end portion of the peeling operation piece is linearly moved toward the first edge side in the peeling method of the second embodiment.

[0041] Figure 18 is an enlarged main part top view showing a state in which the outer end portion of the peeling operation piece is rotated toward the first edge side, moved upward, and moved toward the second film side in the peeling method of the third embodiment.

[0042] Figure 19 is this side view. Detailed Embodiments

[0043] In this specification, "top view" means observing from a direction perpendicular to the surface of the film, "top view drawing" means the drawing in the case of the top view, and "top view shape" means the shape in the case of the top view. Further, in this specification, the numerical range represented by "lower limit value to upper limit value" means not less than the lower limit value and not more than the upper limit value. When a plurality of the numerical ranges are respectively described, "any lower limit value to any upper limit value" can be set by selecting any lower limit value and any upper limit value.

[0044] [Laminated Film]

[0045] The laminated film has a first film and a second film laminated on the first film. The second film is laminated on the surface of the first film in a peelable state. Both the first film and the second film are soft films.

[0046] Figure 1 is a top view of an exemplary laminated film A. From the viewpoint of the shape, as Figure 1 shown, the laminated film A is in a single sheet form. The specific top view shape of the single-sheet laminated film A is not particularly limited, and for example, it is a rectangular shape or a square shape, etc., a rectangular shape.

[0047] When viewed from above, the laminated film A has one side (hereinafter referred to as the "first side") and another side that is inclined and extends at a prescribed angle with respect to the first side (hereinafter referred to as the "second side"). As shown in the example figure, when the top view shape of the laminated film A is rectangular, both the first side and the second side are linear, and the first side and the second side are orthogonal to each other. When the top view shape of the laminated film A is rectangular, the first side is, for example, the long side of the rectangle, and the second side is the short side of the rectangle. In addition, when viewed from above, the laminated film A has a corner defined by the first side and the second side. When the top view shape of the laminated film A is rectangular, the corner is a right angle. In addition, the first side and the second side of the laminated film A are also the first side 2a and the second side 2b of the second film 2.

[0048] From the perspective of the layer structure, as Figure 2 shown, the laminated film A sequentially has a first film 1, an adhesive layer 3, and a second film 2 from the lower side. The second film 2 is laminated on the first film 1 in a peelable state with the adhesive layer 3 interposed therebetween. In the laminated film A, peeling can occur at the interface 2-3 between the second film 2 and the adhesive layer 3, or at the interface 1-3 between the adhesive layer 3 and the first film 1. In the former case, the second film 2 peels off from the first film 1 together with the adhesive layer 3. In the latter case, the adhesive layer 3 remains on the first film 1, and only the second film 2 is peeled off. In either case, the second film 2 can be peeled off from the first film 1.

[0049] In another example, as Figure 3 shown, the laminated film A sequentially has a first film 1 and a second film 2 from the lower side. The second film 2 is laminated on the first film 1 in a pseudo-bonded state. The pseudo-bonding means that the back surface of the second film 2 is bonded to the front surface of the first film 1 with a weak adhesive force. The weak adhesive force means an adhesive force that does not peel off under normal conditions and peels off when a peeling force acts. Examples of pseudo-bonding include electrostatically sealing the back surface of the second film 2 to the front surface of the first film 1, or bonding the back surface of the second film 2 to the front surface of the first film 1 using an adhesive with a very weak adhesive force (such as a primer). In Figure 3 the example shown, the second film 2 peels off at the interface 1-2 between the first film 1 and the second film 2.

[0050] When the first film 1 and the second film 2 are laminated with the adhesive layer 3 interposed therebetween as Figure 2 shown and when they are directly laminated as Figure 3 shown, the second film 2 is laminated and bonded to the first film 1 with an adhesive strength such that it can be peeled off from the first film 1. Hereinafter, the adhesive strength of the second film 2 with respect to the first film 1 is referred to as "adhesive strength (1)". The adhesive strength (1) is an adhesive strength that can be easily peeled off by hand.

[0051] The first film 1 can be a single-layer structure, or alternatively, it can be a multi-layer structure in which two or more layers are bonded. The second film 2 can also be a single-layer structure, or it can also be a multi-layer structure in which two or more layers are bonded. The thickness of the first film 1 is not particularly limited, for example, it is 20 μm to 300 μm. The thickness of the second film 2 is not particularly limited, for example, it is 20 μm to 100 μm, and preferably it is 30 μm to 60 μm.

[0052] In addition, the first film 1 can be a film containing an optical functional layer, or it can also be a film not containing an optical functional layer. The second film 2 can also be a film containing an optical functional layer, or it can also be a film not containing an optical functional layer.

[0053] In the case where the first film 1 is a multi-layer structure, at least one of the layers can be an optical functional layer and the other layers can be layers other than the optical functional layer (hereinafter, the layer other than the optical functional layer is referred to as a "non-optical layer"), or all of the layers can be optical functional layers, or all of the layers can be non-optical layers. In addition, in the case where the first film 1 is a multi-layer structure, at least one of the layers can be laminated in a manner that can be peeled off from the other layers, or all of the optical layers can be firmly bonded in a manner that is difficult to peel off. In the case where the second film 2 is a multi-layer structure, it is the same as the first film 1 of the multi-layer structure, and at least one of them can be an optical functional layer, or all of them can be optical functional layers, or all of them can be non-optical layers. In addition, in the case where the second film 2 is a multi-layer structure, at least one of the layers can be laminated in a manner that can be peeled off from the other layers, or all of the layers can be firmly bonded in a manner that is difficult to peel off.

[0054] In addition, regarding the first film 1 and the second film 2 of the multi-layer structure, in the case where at least one layer is laminated on the other layer in a peelable manner, the adhesive strength between the layers is preferably greater than the above-mentioned adhesive strength (1). That is, in the case where the first film 1 is a peelable multi-layer structure, it is preferably satisfied that the adhesive strength between the layers within the first film 1 > the adhesive strength (1). In the case where the second film 2 is a peelable multi-layer structure, it is preferably satisfied that the adhesive strength between the layers within the second film 2 > the adhesive strength (1). By satisfying this relationship, as will be described later, when using the peeling operation piece to peel the second film 2, a peeling starting point is reliably generated between the first film 1 and the second film 2.

[0055] The optical functional layer is a layer having arbitrary optical properties. Examples of the optical functional layer include a polarizer, a retardation layer, a light diffusion layer, a brightness enhancement layer, an antiglare layer, a light reflection layer, etc. A polarizer is a layer having the property of transmitting light (polarized light) vibrating in a specific one direction and blocking light vibrating in other directions. A retardation layer is a layer showing optical anisotropy, and typically, stretched films such as acrylic resin, cycloolefin resin, cellulose resin, etc. can be cited. Examples of the non-optical layer include a protective layer, an adhesive layer, a release liner, etc. The protective layer is, for example, a layer laminated for the purpose of protecting the optical functional layer, and typically, a colorless and transparent protective film is used. The adhesive layer is a layer composed of a known adhesive. Examples of the release liner include resin films such as polyethylene film, porous films such as paper, synthetic paper, fabric, and foamed resin films.

[0056] As a specific example of the first film 1, a multilayer film composed of a polarizer / retardation layer, a multilayer film composed of a protective layer / adhesive layer / polarizer / adhesive layer / protective layer, a multilayer film composed of a protective layer / adhesive layer / polarizer / retardation layer / adhesive layer / protective layer, a single-layer film composed only of a polarizer, etc. can be cited.

[0057] As a specific example of the second film 2, a single-layer film composed of a release liner, a single-layer film composed of a protective layer, a multilayer film composed of a protective layer / adhesive layer, etc. can be cited.

[0058] [First Embodiment of the Method for Peeling a Multilayer Film]

[0059] In the peeling method of the present invention, when peeling the second film of the multilayer film from the first film, the second film is peeled using a peeling operation piece.

[0060] This peeling method has a step of preparing a multilayer film A with a peeling operation piece adhered to the surface of the second film 2, a starting point forming step of forming a peeling starting point between the second film and the first film using the peeling operation piece, and a peeling step of peeling the second film from the first film.

[0061] Hereinafter, it will be specifically described.

[0062] <Preparation Step>

[0063] Prepare a multilayer film A with a peeling operation piece 5 adhered to the surface of the second film 2. Hereinafter, the multilayer film A with the peeling operation piece 5 adhered will be referred to as "multilayer film B with an operation piece".

[0064] <<Configuration of the Multilayer Film with an Operation Piece>>

[0065] Figure 4 is a top view of the multilayer film B with an operation piece, Figure 5It is an enlarged top view of the main part, Figure 6 and this is its front view.

[0066] Referring to Figures 4 to 6 , the laminated film B with an operation piece has a first film 1, a second film 2 laminated on the first film 1 in a peelable manner, and a peeling operation piece 5 adhered to the surface of the second film 2. The peeling operation piece 5 is appropriately adhered to the surface of the second film 2 by a suitable bonding unit.

[0067] The peeling operation piece 5 has: an adhesion area 6 that overlaps with the surface of the second film 2 and adheres to the surface of the second film 2; a non-adhesion area 7 that is integrally connected to the adhesion area 6 and extends outwardly beyond the first side 2a of the second film 2; and a first edge 7a of the non-adhesion area 7 that extends obliquely with respect to the first side 2a of the second film 2.

[0068] The peeling operation piece 5 is made of a flexible film piece. The film piece constituting the peeling operation piece 5 is not particularly limited, and examples include resin films, papers, synthetic papers, porous films such as fabrics, and foamed resin films. The peeling operation piece 5 is preferably formed using a film piece with a hardness stronger than that of the second film 2. As such a film piece, since it is common, examples include polyester-based films such as polyethylene terephthalate.

[0069] The thickness of the peeling operation piece 5 is not particularly limited, but if it is too small, the mechanical strength becomes insufficient, and if it is too large, there is a risk that the peeling operation piece 5 is difficult to flex. From this perspective, the thickness of the peeling operation piece 5 is, for example, 20 μm to 100 μm, and preferably 30 μm to 60 μm.

[0070] The top view shape of the peeling operation piece 5 is, for example, as shown in Figure 4 and Figure 5 is an elongated strip shape (rectangular shape). However, the top view shape of the peeling operation piece 5 is not limited to the rectangular shape and can be appropriately changed.

[0071] The adhesion area 6 of the peeling operation piece 5 is an area that overlaps the surface of the second film 2 and is an area where part or all of it adheres to the surface of the second film 2. The non-adhesion area 7 of the peeling operation piece 5 is an area that does not overlap the surface of the second film 2 and is an area that extends outward from the first side 2a of the second film 2. The peeling operation piece 5 formed of a single film piece is integrally connected with the adhesion area 6 and the non-adhesion area 7. The peeling operation piece 5 has an edge along the length direction (in this specification, this edge is referred to as the "first edge") and an edge along the length direction on the opposite side of the first edge (in this specification, the opposite edge is referred to as the "second edge"). The first edge and the second edge are edges facing each other in the width direction W of the peeling operation piece 5. Both the first edge and the second edge are linear, and the first edge is parallel to the second edge. However, a peeling operation piece 5 that is not rectangular in a top view can also be used. Regarding the peeling operation piece 5 that is not rectangular, there are cases where the first edge and the second edge are not linear, and there are also cases where the first edge and the second edge are not parallel.

[0072] In addition, since the adhesion area 6 and the non-adhesion area 7 are integrally connected, the first edge of the peeling operation piece 5 is equivalent to the edge formed by the continuous connection of the first edge 6a of the adhesion area 6 and the first edge 7a of the non-adhesion area 7. Similarly, the second edge of the peeling operation piece 5 is equivalent to the edge formed by the continuous connection of the second edge 6b of the adhesion area 6 and the second edge 7b of the non-adhesion area 7.

[0073] The peeling operation piece 5 adheres to the surface of the second film 2 in such a way that the first edge 7a of the non-adhesion area 7 intersects the first side 2a of the second film 2 obliquely in a top view. In a top view, the angle α formed by the first edge 7a of the non-adhesion area 7 and the first side 2a of the second film 2 (that is, the inclination angle of the first edge 7a of the non-adhesion area 7) can be appropriately set within the range of more than 0 degrees and less than 180 degrees. For example, it can be an obtuse angle, or it can also be a right angle, or it can also be an acute angle. As will be described later, when performing an operation to offset the outer end of the peeling operation piece 5, a peeling starting point is likely to be generated. Therefore, the angle α is preferably an acute angle. In specific numerical values, the preferred angle α is 10 degrees to 60 degrees, and more preferably 20 degrees to 45 degrees.

[0074] The adhesion area 6 of the peeling operation piece 5 can also adhere to a position overlapping the corner 21 of the second film 2, but preferably as Figure 4 and Figure 5As shown, the stripping sheet 5 is adhered to the vicinity of the corner 21 without overlapping with the corner 21 of the second film 2. Therefore, both the first edge and the second edge of the stripping sheet 5 intersect with the first side 2a of the second film 2. Hereinafter, the intersection of the first edge of the stripping sheet 5 and the first side 2a of the second film 2 is referred to as the "first intersection p1", and the intersection of the second edge of the stripping sheet 5 and the first side 2a of the second film 2 is referred to as the "second intersection p2". In addition, the first intersection p1 is also the intersection of the first edge 7a of the non-adhesive region 7 and the first side 2a of the second film 2, and the first edge 6a of the adhesive region 6 and the first side 2a of the second film 2. Similarly, the second intersection p2 is also the intersection of the second edge 7b of the non-adhesive region 7 and the first side 2a of the second film 2, and the second edge 6b of the adhesive region 6 and the first side 2a of the second film 2.

[0075] Specifically, refer to Figure 5 The peeling operation sheet 5 is adhered so that the length L1 between the corner 21 of the second film 2 and the first intersection p1 is 1 mm to 10 mm, preferably 2 mm to 7 mm, and more preferably 3 mm to 5 mm.

[0076] The length L2 of the peeling operation sheet 5 is not particularly limited, and is, for example, 20 mm to 50 mm, preferably 25 mm to 40 mm. In addition, the width L3 of the peeling operation sheet 5 is also not particularly limited, but if it is too small, there is a risk that the force for lifting the second film 2 will be weakened due to the deflection of the non-adhesive region 7, and if it is too large, there is a risk that the deflection amount of the non-adhesive region 7 will be reduced. From this point of view, the width L3 of the peeling operation sheet 5 is, for example, 3 mm to 20 mm, preferably 4 mm to 15 mm, and more preferably 5 mm to 10 mm. In addition, the peeling operation sheet 5 is adhered in such a manner that the length L4 between the first intersection p1 and the width edge 6d of the adhesive region 6 (the width edge 6d is the edge along the width direction) is 7 mm to 30 mm, preferably 10 mm to 20 mm.

[0077] The adhesive region 6 of the peeling operation sheet 5 is adhered to the surface of the second film 2 via an adhesive (Japanese: paste) 4 as an example of an adhesive unit. As the adhesive 4, for example, an adhesive (Japanese: adhesive), an adhesive (Japanese: adhesive), etc. can be used. In addition, the adhesive and the adhesive are the same in that they can be sandwiched between two films to bond the two films, but the adhesive is different from the adhesive that cannot be adhered again after peeling in that the adhesive has a long-term continuous adhesiveness and can be adhered again after peeling. The adhesive region 6 of the peeling operation sheet 5 can be adhered to the surface of the second film 2 in a peelable state, or can be firmly adhered to the surface of the second film 2 in a difficult-to-peel state.

[0078] The adhesion region 6 overlapping the surface of the second film 2 may have a part pasted to the second film 2, or may be entirely pasted to the second film 2.

[0079] In Figure 5 the example shown, the entire adhesion region 6 is bonded to the surface of the second film 2 via the adhesive 4. In Figure 5 the top view shown, for convenience, numerous dots are added to the range where the adhesive 4 is provided. Hereinafter, in other top views as well, the portion where numerous dots are added indicates the range where the adhesive 4 is provided.

[0080] As Figure 5 shown, the entire adhesion region 6 is bonded to the surface of the second film 2 via the adhesive 4. The adhesive 4 is provided in the range from the width edge 6d of the adhesion region 6 to the parallel line passing through the first intersection point p1. In addition, the parallel line refers to a line parallel to the width edge 6d of the adhesion region 6. Thus, the bonding portion of the adhesion region 6 with respect to the second film 2 reaches the entire first side 2a of the second film 2 within the overlapping range of the adhesion region 6. In other words, the adhesion region 6 is bonded within the range surrounded by the width edge 6d, the first intersection point p1, and the second intersection point p2.

[0081] In addition, in Figure 5 part of the adhesive 4 protrudes outward beyond the first side 2a of the second film 2, but the peeling operation piece 5 is used when peeling the second film 2, so even if the adhesive 4 does not protrude, it will not pose any obstacle to the peeling of the second film 2.

[0082] The bonding portion of the adhesion region 6 with respect to the second film 2 is not limited to Figure 5 the example shown and can be appropriately changed. Figure 7 is a main part enlarged top view showing several other examples of the bonding portion.

[0083] In Figure 7 the other example shown in (a) thereof, the entire adhesion region 6 is bonded to the surface of the second film 2 via the adhesive 4. The adhesive 4 (dots are added to the range where the adhesive 4 is provided) is provided in the range from the width edge 6d of the adhesion region 6 to the first side 2a of the second film 2. Thus, the bonding portion of the adhesion region 6 with respect to the second film 2 reaches the entire first side 2a of the second film 2 within the overlapping range of the adhesion region 6. In other words, the adhesion region 6 is bonded within the range surrounded by the width edge 6d, the first intersection point p1, and the second intersection point p2.

[0084] In Figure 7In the other example shown in (b), a part of the adhesion region 6 is adhered to the surface of the second film 2 via the adhesive 4. The adhesive 4 is provided in a range from the width edge 6d of the adhesion region 6 to a parallel line passing through the midpoint p3 between the first intersection point p1 and the second intersection point p2. Therefore, the bonded portion of the adhesion region 6 to the second film 2 reaches the first side 2a of the second film 2 at the midpoint p3 from the first intersection point p1. In addition, in Figure 7 In (b), a part of the adhesive 4 protrudes outward beyond the first side 2a of the second film 2, but the same as above, it does not cause any obstacle to the peeling of the second film 2.

[0085] In Figure 7 In the other example shown in (c), the adhesive 4 is provided in a range from the width edge 6d of the adhesion region 6 to a parallel line passing through the second intersection point p2. Therefore, the bonded portion of the adhesion region 6 to the second film 2 reaches the first side 2a of the second film 2 at the second intersection point p2.

[0086] In addition, the bonding strength of the bonded portion of the adhesion region 6 to the second film 2 is greater than the above bonding strength (1). By satisfying this relationship, as will be described later, when the second film 2 is peeled off using the peeling operation piece 5, the second film 2 can be pulled out without the peeling operation piece 5 peeling off from the second film 2.

[0087] <<Manufacture of the laminated film with an operation piece>>

[0088] The laminated film B with an operation piece is obtained by adhering the peeling operation piece 5 to the surface of the second film 2 of the laminated film A. The adhesion of the peeling operation piece 5 can be performed manually or mechanically.

[0089] Here, an example of mechanically adhering the peeling operation piece 5 to the laminated film A will be described.

[0090] Figure 8 is a top view of the workbench 8. The workbench 8 has a flat placing surface 81 for placing the laminated film A and a fixing unit for fixing the laminated film A placed on the placing surface 81. In addition, in Figure 8In the figure, the laminated film A is shown by a double-dashed line as a virtual line. When the peeling operation piece 5 is adhered to the laminated film A, the fixing unit can fix the laminated film A placed on the placement surface 81 so that it does not move inadvertently. In addition, the fixing can be released so that the laminated film A can be removed from the placement surface 81. The fixing unit is not particularly limited, but for example, a mechanism that adsorbs the laminated film A by air can be used. The fixing unit that adsorbs the laminated film A has, for example, a plurality of ventilation holes 82 formed in the placement surface 81, a closed cavity portion (not shown) provided on the back side of the placement surface 81, and a suction machine (not shown) that sucks the air in the closed cavity portion. The placement surface 81 is generally larger than the area of the laminated film A, and the laminated film A is placed in a specified area of the placement surface 81. In the area where the laminated film A is placed, a plurality of the ventilation holes 82 are provided at a specified interval.

[0091] By sucking the air in the closed cavity portion with a suction machine such as a vacuum pump, the inside of the closed cavity portion becomes negative pressure, and the laminated film A is pulled toward the placement surface 81 through the ventilation holes 82 and fixed. On the other hand, if the suction of the suction machine is stopped, the inside of the closed cavity portion returns to normal pressure, the adsorption of the laminated film A is released, and the laminated film A can be easily removed from the placement surface 81.

[0092] The peeling operation piece 5 is adhered to the laminated film A fixed to the placement surface 81 of the workbench 8. As described above, the peeling operation piece 5 has an adhesive 4 provided on the back surface of the adhesion area 6. For example, as Figure 9 shown, an adhesion device is used to adhere the peeling operation piece 5 to the laminated film A. The adhesion device has a support shaft 91 extending in the vertical direction, a chuck portion 92 that clamps the outer end portion 71 of the non-adhesion area 7 of the peeling operation piece 5, an arm portion 93 that connects the support shaft 91 and the chuck portion 92, a drive portion (not shown) that moves the support shaft 91 and the chuck portion 92, and a control portion (not shown) that controls the operations of the chuck portion 92 and the drive portion, etc. The outer end portion 71 of the non-adhesion area 7 is clamped by the chuck portion 92, the support shaft 91 is moved downward to move the peeling operation piece 5 downward, and the adhesive 4 in the adhesion area 6 of the peeling operation piece 5 is bonded to the surface of the laminated film A (the surface of the second film 2), thereby obtaining Figures 4 to 6 the laminated film B with an operation piece as shown. In addition, after the adhesive 4 in the adhesion area 6 is adhered to the surface of the laminated film A, if necessary, the upper part of the adhesion area 6 is pressed by a pressing member (not shown), so that the adhesion area 6 can be firmly adhered to the laminated film A.

[0093] <Starting point forming process>

[0094] Next, for the above-mentioned laminated film B with an operation piece, a peeling starting point is formed between the second film 2 and the first film 1 by using the peeling operation piece 5.

[0095] The peeling of the second film 2 can be carried out manually or mechanically, but it is usually carried out mechanically.

[0096] As described above, the laminated film B with the operation piece is fixed to the workbench 8 by the fixing unit. As Figure 10 and Figure 11 shown, the outer end portion 71 of the non-adhesive region 7 of the peeling operation piece 5 is clamped by the chuck portion of the peeling device. In the illustrated example, the adhesion device is used as the peeling device. That is, the adhesion device 9 serves both as a device for adhering the peeling operation piece 5 to the laminated film A and as a peeling device for peeling the second film 2 using the peeling operation piece 5. However, different devices may also be used for the adhesion device and the peeling device. In this case, after the peeling operation piece 5 is pasted on the laminated film A by the adhesion device to produce the laminated film B with the operation piece, the adhesion device is separated from the peeling operation piece 5, and then the outer end portion 71 of the peeling operation piece 5 is clamped by the chuck portion of another peeling device.

[0097] Referring to Figure 10 and Figure 11 , the peeling device (the peeling device that also serves as the adhesion device) has, as described above, a support shaft 91, a chuck portion 92, an arm portion 93, a drive portion (not shown) for moving the chuck portion 92 via the arm portion 93, and a control portion (not shown). The support shaft 91 can rotate about the axis O by the operation of the drive portion. The axis O of the support shaft 91 extends in the vertical direction Z. The vertical direction Z refers to the direction perpendicular to the surface of the second film 2. The chuck portion 92 connected to the support shaft 91 via the arm portion 93 rotates and moves along a plane parallel to the surface of the second film 2 following the rotation of the support shaft 91. Hereinafter, the plane parallel to the surface of the second film 2 may sometimes be referred to as the "parallel plane".

[0098] In addition, the support shaft 91 and the chuck portion 92 following the support shaft 91 can move in the vertical direction Z by the operation of the drive portion. Moreover, the support shaft 91 and the chuck portion 92 following the support shaft 91 can move parallel in an arbitrary direction within the parallel plane by the operation of the drive portion. That is, the support shaft 91 and the chuck portion 92 following the support shaft 91 can move in the transverse direction X, the longitudinal direction Y, and the direction V inclined with respect to the transverse direction X or the longitudinal direction Y within the parallel plane, respectively.

[0099] The laminated film B with the operation piece is fixed to the placement surface portion 81 of the workbench 8 via the fixing unit. As Figure 10 and Figure 11As shown, the outer end portion 71 of the non-adhesive region 7 of the peeling operation piece 5 is clamped by the chuck portion 92 of the peeling device. In addition, in the illustrated example, the chuck portion 92 is an example of a jig type that clamps the front and back surfaces of the outer end portion 71 of the non-adhesive region 7, but the chuck portion 92 is not limited to this type.

[0100] The gripping amount of the chuck portion 92 on the outer end portion 71 is not particularly limited, but if it is too large, the freely movable portion in the non-adhesive region 7 becomes smaller, and if it is too small, there is a risk that the outer end portion 71 will come off the chuck portion 92. From this viewpoint, the gripping amount L5 of the chuck portion 92 on the outer end portion 71 is preferably a portion that is about 2 mm to 5 mm away from the width end edge 7d of the non-adhesive region 7.

[0101] In addition, the length L6 from the clamping end of the chuck portion 92 to the second intersection point p2 is not particularly limited, but in order to make the non-adhesive region 7 flex well, it is 12 mm to 40 mm, and preferably 15 mm to 30 mm.

[0102] The chuck portion 92 is moved by moving the movable support shaft 91, so that the outer end portion 71 of the non-adhesive region 7 clamped by the chuck portion 92 is offset toward the first edge 7a side. For example, the outer end portion 71 of the non-adhesive region 7 clamped by the chuck portion 92 is offset along the plane parallel to the first edge 7a side. The outer end portion 71 is the end portion of the non-adhesive region 7, and the first edge of the outer end portion 71 is also the first edge 7a of the non-adhesive region 7. Making the outer end portion 71 offset toward the first edge 7a side also means offsetting in the width direction W to the side opposite to the second edge 7b of the non-adhesive region 7.

[0103] The operation of offsetting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a side includes Figure 10 In the top view shown, the operation of offsetting the outer end portion 71 in the direction G1 orthogonal to the first edge 7a or in the direction G2 at an acute angle β with respect to the first edge 7a. The acute angle β is close to 90 degrees, for example, 70 degrees or more and less than 90 degrees. Preferably, the operation of offsetting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a side includes the operation of rotating and moving the outer end portion 71 along the plane parallel to the first edge 7a side.

[0104] Figure 12 It is an enlarged top view of the main part when offsetting the outer end portion 71 of the non-adhesive region 7 to generate a peeling starting point, Figure 13 It is a side view thereof, Figure 14 It is a reference perspective view thereof. In addition, in Figure 12 The chuck portion 92 before offsetting the outer end portion 71 of the non-adhesive region 7 is indicated by a double-dashed line.

[0105] The operation of shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a is as described above and includes an operation of shifting along a parallel plane (a plane parallel to the surface of the second film 2). In Figure 13 the parallel plane F (a plane parallel to the surface of the second film 2) is indicated by a single-dot chain line. In a preferred embodiment, the operation includes an operation of rotationally moving the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a within the parallel plane F.

[0106] In another aspect, the operation of shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a includes, as will be described later, an operation of shifting the outer end portion 71 along the parallel plane F toward the first edge 7a so that the non-adhesive region 7 is flexed.

[0107] <<Rotational Movement>>

[0108] The operation of the rotational movement is as Figures 12 to 14 shown. In the parallel plane F, the outer end portion 71 is rotated toward the first edge 7a (refer to Figure 13 ). In other words, the operation of the rotational movement is to rotate the outer end portion 71 toward the side opposite to the second edge 7b side (i.e., the first edge 7a side of the non-adhesive region 7). In Figure 12 showing the state at the time of the rotational operation, the chuck portion 92 indicated by a double-dot chain line at the initial position (the position before movement) is moved to the position of the chuck portion 92 shown by a solid line by the rotational movement T1 indicated by an arrow.

[0109] The rotation center of the rotational movement of the outer end portion 71 is the axis core O of the support shaft 91. The rotation center may be set at a position such that the outer end portion 71 moves in the direction G1 or the direction G2 as Figure 10 shown. The radius R of the rotational movement is not particularly limited and is, for example, about 50 mm to 120 mm. The rotation angle γ (central angle) is not particularly limited and is, for example, about 5 degrees to 20 degrees. The moving distance L7 of the outer end portion 71 is about 3 mm to 15 mm in terms of the straight-line length.

[0110] By shifting the outer end portion 71 of the non-adhesive region 7 along the parallel plane F toward the first edge 7a, the non-adhesive region 7 is flexed. Specifically, by shifting the outer end portion 71 along the parallel plane F toward the first edge 7a, as Figures 12 to 14As shown, the non-adhesive region 7 deforms by bulging upward in a undulating manner. Additionally, the upward direction refers to the direction away from the surface of the second film 2 in the vertical direction Z. Further, if the non-adhesive region 7 flexes, the first edge 7a and the second edge 7b of the non-adhesive region 7 also deform. If the outer end portion 71 is offset toward the first edge 7a to cause the non-adhesive region 7 to flex upward, the second edge 7b of the non-adhesive region 7 on the side opposite to the first edge 7a is pulled closer. Therefore, at the second intersection point p2 (the intersection point of the second edge 7b of the non-adhesive region 7 and the first side 2a of the second film 2) and in its vicinity, the second film 2 floats up from the first film 1, and a peeling start point S is generated between the second film 2 and the first film 1.

[0111] In addition, in Figure 13 and Figure 14 the laminated film A having a layer structure of the first film 1 / adhesive layer 3 / second film 2 in this order from the lower side is exemplified ( Figure 3 the laminated film A). And it is the laminated film A that can be peeled at the interface 1-3 between the first film 1 and the adhesive layer 3. Since the second film 2 peels from the first film 1 along with the adhesive layer 3 in this laminated film A, a peeling start point S is generated at the interface 1-3 between the first film 1 and the adhesive layer 3.

[0112] As in the past, a peeling operation piece is adhered in a manner orthogonal to one side of the film. When the peeling operation piece is reversed, a force that pulls up the film acts over the entire width of the peeling operation piece. When such a force that pulls up the film acts over the entire width of the peeling operation piece, there is a possibility of force dispersion and peeling errors such as the peeling operation piece peeling from the film before the peeling start point is generated.

[0113] Regarding this point, as described above, by offsetting the outer end portion 71 of the non-adhesive region 7 of the peeling operation piece 5 toward the first edge 7a, the upward pulling force is likely to concentrate at the second intersection point p2, and a peeling start point S will be reliably generated between the second film 2 and the first film 1.

[0114] <Peeling process>

[0115] After the peeling start point S is formed, the peeling operation piece 5 is pulled out to peel the second film 2 from the first film 1.

[0116] Figure 15 and Figure 16 show the process of pulling out the peeling operation piece 5. Additionally, in Figure 15 and Figure 16 regarding the peeling device, only the chuck portion 92 is shown (the support shaft 91 and the arm portion 93 are not shown).

[0117] As Figure 15As shown, while lifting the outer end portion 71 of the non-adhesive region 7 of the peeling operation piece 5 upward, the non-adhesive region 7 is inverted. Further, as Figure 16 shown, while inverting the non-adhesive region 7, the outer end portion 71 of the non-adhesive region 7 is pulled out along the surface of the second film 2. When the second film 2 is rectangular and the peeling operation piece 5 is disposed near the corner portion 21, it is preferable to pull out the outer end portion 71 of the non-adhesive region 7 in the diagonal direction of the second film 2 while inverting the non-adhesive region 7. By pulling out in the diagonal direction, the second film 2 can be peeled off perfectly.

[0118] Since the peeling start point S is formed in advance, when the peeling operation piece 5 is pulled out, the second film 2 can be easily peeled off from the surface of the first film 1 starting from the peeling start point S. In particular, the adhesive region 6 of the peeling operation piece 5 does not overlap with the corner portion 21 of the second film 2, but adheres near the corner portion 21 of the second film 2. Thus, when the non-adhesive region 7 is lifted upward, the vicinity of the corner portion 21 of the second film 2 can be easily peeled off from the first film 1.

[0119] Moreover, since the adhesive region 6 of the peeling operation piece 5 adheres near the corner portion 21 of the second film 2, there are the following advantages. Specifically, as described above, by fixing the laminated film A to the workbench 8, when the second film 2 is peeled off, it is possible to prevent the laminated film A (the first film 1) from leaving or deviating from the workbench 8. When an adsorption method for sucking the laminated film A is used as the fixing unit, the vicinity of the laminated film A opposite to the ventilation hole 82 is directly adsorbed to the ventilation hole 82, but the vicinity not opposite to the ventilation hole 82 is not directly adsorbed. If the laminated film A can be placed on the placement surface 81 such that the ventilation hole 82 is located at the corner of the laminated film A, the corner can be directly adsorbed by the ventilation hole 82. However, in an actual device, due to the number of formed ventilation holes 82, the formed positions, the size of the laminated film A, etc., it is sometimes difficult to place the laminated film A on the placement surface 81 such that the corner of the laminated film A is opposite to the ventilation hole 82. Also, if the peeling operation piece 5 is overlapped and adhered to the corner portion 21 (the corner of the laminated film A) of the second film 2, there is a concern that when the second film 2 is peeled off using the peeling operation piece 5, the corner of the laminated film A will float from the placement surface 81 and the second film 2 cannot be peeled off from the first film 1. Regarding this point, by adhering the adhesive region 6 of the peeling operation piece 5 near the corner portion 21 of the second film 2, the peeling start point S can be reliably formed and the second film 2 can be easily peeled off from the first film 1.

[0120] After peeling the second film 2, any treatment is performed on the first film 1. Examples of the any treatment include (a) laminating any other film on the first film 1, (b) performing a surface treatment on the first film 1, (c) forming any layer on the first film 1, (d) performing a cutting process on the first film 1, etc.

[0121] Alternatively, after peeling off the second film 2, the second film 2 can be bonded again. For example, after peeling off the second film 2, the state of the first film 1 is inspected, and the second film 2 is bonded again to the surface of the inspected first film 1.

[0122] Alternatively, after peeling off the second film 2, the first film 1 can be removed from the workbench 8 by releasing the fixing unit of the workbench 8.

[0123] [Second Embodiment of the Laminated Film Peeling Method]

[0124] In the above first embodiment, as the operation of shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a side, the operation of rotating and moving the outer end portion 71 along the parallel plane F is exemplified, but it is not limited thereto, and can be appropriately designed and changed.

[0125] In the second embodiment, as the operation of shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a side, the operation of linearly moving the outer end portion 71 along the parallel plane is exemplified.

[0126] As described in the above <Preparation Step> column, the laminated film B with the operation piece is prepared, and as described in the above <Starting Point Formation Step> column, the outer end portion 71 of the non-adhesive region 7 is clamped by the chuck portion 92 of the peeling device.

[0127] <<Linear Movement>>

[0128] As Figure 17 shown, the outer end portion 71 of the non-adhesive region 7 is linearly moved within the parallel plane. In Figure 17 showing the state during the linear movement operation, the chuck portion 92 and the support shaft 91 indicated by the double-dot chain line at the initial position (position before movement) are linearly moved in the direction shown by the arrow by T2 and moved to the positions of the chuck portion 92 and the support shaft 91 shown by the solid line.

[0129] The moving direction of the outer end portion 71 is set to Figure 10 the direction G1 or the direction G2 shown. In addition, the moving distance L7 of the outer end portion 71 is about 3 mm to 15 mm in terms of the straight line length.

[0130] In the operation of rotating and moving the outer end portion 71 as in the above first embodiment, the locus of the outer end portion 71 depicts an arc. In the case of this embodiment, the locus of the outer end portion 71 becomes a straight line. This embodiment is different from the above first embodiment in this regard, and the other aspects are the same as the above first embodiment.

[0131] In the present embodiment, the outer end portion 71 of the non-adhesive region 7 is also offset toward the first edge 7a to generate a peeling start point S at and near the second intersection point p2.

[0132] After that, as described in the <Peeling step> section above, the non-adhesive region 7 is pulled out while being reversed, so that the second film 2 can be peeled off from the first film 1.

[0133] [Third Embodiment of the Method for Peeling a Stacked Film]

[0134] In the above-described first and second embodiments, the operation of offsetting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a is exemplified. However, in addition to this, the outer end portion 71 can be moved upward (in a direction away from the surface of the second film 2), and the outer end portion 71 can also be moved toward the second film side.

[0135] In the third embodiment, the operation of the outer end portion 71 of the non-adhesive region 7 includes an operation of rotationally moving the outer end portion 71 along the parallel plane F and an operation of moving the outer end portion 71 upward. Preferably, in the third embodiment, the operation of the outer end portion 71 of the non-adhesive region 7 includes an operation of rotationally moving the outer end portion 71 along the parallel plane F, an operation of moving the outer end portion 71 upward, and an operation of moving the outer end portion 71 along the parallel plane F toward the second film 2 side.

[0136] As described in the <Preparation step> section above, prepare the stacked film B with an operation piece, and as described in the <Start point formation step> section above, clamp the outer end portion 71 of the non-adhesive region 7 with the chuck portion 92 of the peeling device.

[0137] <<Rotational movement + upward movement + parallel movement>>

[0138] As Figure 18 and Figure 19 shown, the outer end portion 71 of the non-adhesive region 7 is rotationally moved along the parallel plane F while moving upward in the vertical direction, and is also moved parallel to the second film 2 side along the parallel plane. The rotational movement of the outer end portion 71, the upward movement of the outer end portion 71, and the parallel movement of the outer end portion 71 are performed simultaneously in parallel. In the Figure 18 and Figure 19 showing the states of the operations representing the rotation, upward movement, and parallel movement, the chuck portion 92, the support shaft 91, and the arm portion 93 indicated by the double-dashed line at the initial position (position before movement) are moved to the positions of the chuck portion 92, the support shaft 91, and the arm portion 93 shown by the solid line by the rotational movement T1 indicated by the arrow, the upward movement T3 indicated by the arrow, and the linear movement T4 toward the second film 2 side indicated by the arrow.

[0139] As in the present embodiment, the outer end portion 71 of the non-adhesive region 7 is moved upward while rotating and moving along a parallel plane, so that the second edge 7b of the non-adhesive region 7 on the side opposite to the first edge 7a is pulled upward. Therefore, the peeling starting point S will be generated more reliably. Further, in the rotational movement of the outer end portion 71 and the upward movement of the outer end portion 71, an operation of moving the outer end portion 71 parallel to the second film 2 side is performed in parallel at the same time, so as to generate a larger peeling starting point S. Therefore, this is more preferable.

[0140] After that, as described in the <Peeling Process> section above, the non-adhesive region 7 is pulled out while being reversed, so that the second film 2 can be peeled off from the first film 1.

[0141] In addition, in the present embodiment, the outer end portion 71 of the non-adhesive region 7 may be moved linearly in a parallel plane and upward as in the second embodiment. Further, the outer end portion 71 of the non-adhesive region 7 may be moved linearly in a parallel plane and parallel to the second film 2 side along the parallel plane as in the second embodiment.

[0142] Description of Reference Numerals

[0143] 1 First film

[0144] 2 Second film

[0145] 2a First side of the second film

[0146] 2b Second side of the second film

[0147] 21 Corner portion of the second film

[0148] 5 Peeling operation piece

[0149] 6 Adhesive region of the peeling operation piece

[0150] 7 Non-adhesive region of the peeling operation piece

[0151] 7a First edge of the non-adhesive region

[0152] 7b Second edge of the non-adhesive region 7

[0153] 71 Outer end portion of the non-adhesive region

[0154] 92 Chuck portion

[0155] A Laminated film

[0156] S Peeling starting point

Claims

1. A method for peeling a laminated film, wherein the laminated film comprises a first film and a second film laminated on the first film in a peelable manner, and wherein the second film of the laminated film is peeled off from the first film, wherein: A peeling operation sheet is adhered to the surface of the second film. The peeling operation sheet comprises: an adhesive region overlapping with and adhering to the surface of the second film; and a non-adhesive region integrally connected to the adhesive region and extending outward from the first side of the second film. and a first edge of the non-adhesive area extending obliquely relative to a first side of the second film, The outer end of the non-adhesive region is clamped and shifted toward the first edge, thereby generating a peeling starting point between the second film and the first film.

2. The method for peeling a laminated film according to claim 1, wherein: The outer end of the non-adhesive region is offset toward the first edge side along a surface parallel to the surface of the second film.

3. The method for peeling a laminated film according to claim 1, wherein: The outer end of the non-adhesive region is rotationally moved along a plane parallel to the surface of the second film.

4. The method for peeling a laminated film according to claim 1, wherein: The outer end of the non-adhesive region is moved in a direction away from the surface of the second film while rotating along a plane parallel to the surface of the second film.

5. The method for peeling a laminated film according to claim 1, wherein: The outer end of the non-adhesive region is moved toward the second film while rotating along a plane parallel to the surface of the second film.

6. The method for peeling a laminated film according to any one of claims 1 to 5, characterized in that: An angle formed between the first edge of the non-adhesive area and the first side of the second film is an acute angle.

7. The method for peeling a laminated film according to any one of claims 1 to 5, characterized in that: The second film has a second side extending in a direction orthogonal to the first side, The adhesive region of the peeling operation sheet is adhered to the vicinity of a corner defined by the first side and the second side of the second film.

8. The method for peeling a laminated film according to any one of claims 1 to 5, characterized in that: After the peeling starting point is generated, the non-adhesive region is pulled out along the surface of the second film while being turned over.

9. The method for peeling a laminated film according to claim 8, characterized in that: The second film is rectangular in shape, The adhesive region of the peeling operation sheet is adhered to the vicinity of the corner of the second film, The non-adhesive region is pulled out in a diagonal direction of the second film while being turned over.

10. A laminated film peeling device, which is a device for implementing the method according to claim 1, characterized in that: The device includes an outer end chuck portion for clamping the peeling operation piece and a driving portion for moving the chuck portion.

Images