Laminated film peeling method and peeling device

Abstract

To provide a method to reliably peel a second film from a first film using a peeling operation piece.SOLUTION: In a method to peel a second film 2 of a laminated film A from a first film 1, a peeling operation piece 5 is adhered to the surface of the second film 2, the peeling operation piece 5 has an adherence area 6 that is superimposed on the surface of the second film 2 and adhered to the surface of the second film 2, a non-adherence area 7 that is integrally connected to the adherence area 6 and extends outward beyond a first side 2a of the second film 2, and a first edge 7a of the non- adherence area 7 that extends obliquely with respect to the first side 2a of the second film 2, and a peeling starting point S is generated between the second film 2 and the first film 1 by gripping an outer end 71 of the non- adherence area 7 and shifting the outer end 71 of the non- adherence area 7 toward the first edge 7a.SELECTED DRAWING: Figure 14

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, an operation piece for peeling is attached to the film, and one film is peeled using this operation piece for peeling. For example, Patent Document 1 discloses the following matters in paragraphs

[0081] to

[0083] . One part of a leader member is attached to an end part of a release film, the other part of the leader member is extended outward from the release film, the other part of the leader member is clamped by a clamping means, the direction of the clamping means is folded back so as to be reversed by 180 degrees, and the leader member is pulled out to a predetermined position, whereby the release film is peeled from the polarizing plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] However, when the leader member (operation piece for peeling) is suddenly reversed by 180 degrees and pulled out as in Patent Document 1, there is a risk that the release film cannot be peeled. That is, in the method of Patent Document 1, there is a risk of peeling failure of the release film.

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a method and an apparatus capable of surely peeling a second film from a first film using an operation piece for peeling.

Means for Solving the Problems

[0006] The method for peeling a laminated film according to the first embodiment is a method for peeling the second film from the first film of a laminated film having a first film and a second film laminated on the first film so as to be peelable. An operation piece for peeling is attached to the surface of the second film. The operation piece for peeling has an attachment region that is overlapped with and attached to the surface of the second film, a non-attachment region that is integrally connected to the attachment region and extends outside the first side of the second film, and a first edge of the non-attachment region that extends obliquely with respect to the first side of the second film. By grasping the outer end portion of the non-attachment region and shifting the outer end portion of the non-attachment region toward the first edge side, a peeling start point is generated between the second film and the first film.

[0007] The method for peeling a laminated film according to the second embodiment is the peeling method of the first embodiment, wherein the outer end portion of the non-attachment region is shifted toward the first edge side along a plane parallel to the surface of the second film. The method for peeling a laminated film according to the third embodiment is the peeling method of the first or second embodiment, wherein the outer end portion of the non-attachment region is rotationally moved along a plane parallel to the surface of the second film. The method for peeling a laminated film according to the fourth embodiment is the peeling method of any one of the first to third embodiments, wherein the outer end portion of the non-attachment 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. The method for peeling a laminated film according to the fifth embodiment is the peeling method of any one of the first to fourth embodiments, wherein the outer end portion of the non-attachment region is moved toward the second film side while being rotationally moved along a plane parallel to the surface of the second film. The method for peeling a laminated film according to the sixth embodiment is the peeling method of any one of the first to fifth embodiments, wherein the angle formed by the first edge of the non-attachment region and the first side of the second film is an acute angle. The method for peeling a laminated film according to the seventh aspect is any of the peeling methods of the first to sixth aspects, wherein the second film has a second side extending in a direction orthogonal to the first side, and the attachment region of the operation piece for peeling is attached near a corner portion defined by the first side and the second side of the second film. The method for peeling a laminated film according to the eighth aspect is any of the peeling methods of the first to seventh aspects, wherein after causing the peeling start point, the non-attached region is pulled out along the surface of the second film while being inverted. The method for peeling a laminated film according to the ninth aspect is the peeling method of the sixth aspect, wherein the second film is rectangular, the attachment region of the operation piece for peeling is attached near a corner portion of the second film, and the non-attached region is pulled out in a diagonal direction of the second film while being inverted.

[0008] According to another aspect of the present invention, a peeling device for a laminated film is provided. The peeling device for the laminated film is a device that implements any of the peeling methods of the first to ninth aspects, and has a chuck portion that grips an outer end portion of the operation piece for peeling, and a drive portion that moves the chuck portion.

Effects of the Invention

[0009] According to the method of the present invention, the second film can be reliably peeled from the first film.

Brief Description of the Drawings

[0010]

Figure 1

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Embodiments for Carrying Out the Invention

[0011] In this specification, "plan view" means viewing from a direction perpendicular to the surface of the film, "plan view drawing" means the drawing in the plan view, and "plan view shape" means the shape in the plan view. Also, in this specification, a numerical range represented by "lower limit value to upper limit value" means greater than or equal to the lower limit value and less than or equal to the upper limit value. When a plurality of such numerical ranges are separately described, any lower limit value and any upper limit value can be selected to set "any lower limit value to any upper limit value".

[0012] [Laminated Film] 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 flexible films. FIG. 1 is a plan view drawing of one exemplary laminated film A. From the perspective of shape, as shown in FIG. 1, the laminated film A is in the form of a single sheet. The specific plan view shape of the single-sheet laminated film A is not particularly limited and is, for example, a rectangular shape such as a rectangular shape or a square shape. The laminated film A has, in plan view, one side (hereinafter referred to as the "first side") and another side (hereinafter referred to as the "second side") that extends obliquely at a predetermined angle with respect to the first side. As in the illustrated example, when the plan view shape of the laminated film A is rectangular, both the first side and the second side are straight lines, and the first side and the second side are perpendicular to each other. When the plan 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. Also, the laminated film A has, in plan view, one corner portion defined by the first side and the second side. When the plan view shape of the laminated film A is rectangular, the corner portion is a right angle. Note that 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.

[0013] From the perspective of the layer structure, as shown in Fig. 2, the laminated film A has, in order from the lower side, a first film 1, an adhesive layer 3, and a second film 2. The second film 2 is laminated on the first film 1 in a peelable state via the adhesive layer 3. In the laminated film A, it may be peeled at the interface 2-3 between the second film 2 and the adhesive layer 3, or may be peeled at the interface 1-3 between the adhesive layer 3 and the first film 1. In the former case, the second film 2 is peeled 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. In any case, the second film 2 can be peeled from the first film 1.

[0014] In another example, as shown in Fig. 3, the laminated film A has, in order from the lower side, a first film 1 and a second film 2. The second film 2 is laminated on the first film 1 in a state of being pseudo-adhered. The pseudo-adhesion means that the back surface of the second film 2 and the front surface of the first film 1 are adhered with a weak adhesive force. The weak adhesive force refers to an adhesive force that does not peel off in the normal state and peels off when a peeling force acts. Examples of the pseudo-adhesion include electrostatically sealing the back surface of the second film 2 to the front surface of the first film 1, or adhering the back surface of the second film 2 to the front surface of the first film 1 with an adhesive (such as a primer) having a very weak adhesive force. In the example shown in Fig. 3, the second film 2 is peeled at the interface 1-2 between the first film 1 and the second film 2. Whether the first film 1 and the second film 2 are laminated via the adhesive layer 3 as shown in Fig. 2 or directly laminated as shown in Fig. 3, the second film 2 is laminated and adhered to the first film 1 with an adhesive strength that allows it to be peeled from the first film 1. Hereinafter, the adhesive strength of the second film 2 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 manually.

[0015] The first film 1 may have a single-layer structure or a multilayer structure in which two or more layers are adhered. The second film 2 may also have a single-layer structure or a multilayer structure in which two or more layers are adhered. The thickness of the first film 1 is not particularly limited and is, for example, 20 μm to 300 μm. The thickness of the second film 2 is not particularly limited and is, for example, 20 μm to 100 μm, preferably 30 μm to 60 μm. Further, the first film 1 may be a film including an optical functional layer or a film not including an optical functional layer. The second film 2 may also be a film including an optical functional layer or a film not including an optical functional layer.

[0016] When the first film 1 has a multilayer structure, at least one of the layers may be an optical functional layer and the other layers may be layers other than the optical functional layer (hereinafter, the layers other than the optical functional layer are referred to as "non-optical layers"), or all the layers may be optical functional layers, or all the layers may be non-optical layers. Also, when the first film 1 has a multilayer structure, at least one of the layers may be laminated so as to be peelable from the other layers, or all the layers may be firmly adhered so as to be difficult to peel. The same applies to the case where the second film 2 has a multilayer structure. That is, at least one of the layers may be an optical functional layer, or all of the layers may be optical functional layers, or all of the layers may be non-optical layers. Also, when the second film 2 has a multilayer structure, at least one of the layers may be laminated so as to be peelable from the other layers, or all the layers may be firmly adhered so as to be difficult to peel.

[0017] Regarding the first film 1 and the second film 2 having a multilayer structure, when at least one layer is laminated so as to be peelable from the other layer, the adhesive strength between the layers is preferably greater than the above adhesive strength (1). That is, when the first film 1 has a multilayer structure that is peelable, it is preferable that the relationship of the adhesive strength between the layers in the first film 1 > adhesive strength (1) is satisfied. When the second film 2 has a multilayer structure that is peelable, it is preferable that the relationship of the adhesive strength between the layers in the second film 2 > adhesive strength (1) is satisfied. By satisfying this relationship, as will be described later, when peeling the second film 2 using the peeling operation piece, a peeling starting point is surely generated between the first film 1 and the second film 2.

[0018] The optical functional layer is a layer having arbitrary optical characteristics. 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, and the like. A polarizer is a layer having a 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 exhibiting optical anisotropy, and typically, examples thereof include stretched films such as acrylic resins, cycloolefin resins, and cellulose resins. Examples of the non-optical layer include a protective layer, an adhesive layer, and a release liner. The protective layer is a layer laminated for the purpose of protecting, for example, 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 films, porous films such as paper, synthetic paper, and woven fabrics, and foamed resin films.

[0019] Specific examples of the first film 1 include a film having a multilayer structure composed of a polarizer / retardation layer, a film having a multilayer structure composed of a protective layer / adhesive layer / polarizer / adhesive layer / protective layer, a film having a multilayer structure composed of a protective layer / adhesive layer / polarizer / retardation layer / adhesive layer / protective layer, and a film having a single-layer structure composed of only a polarizer. As specific examples of the second film 2, there may be mentioned a film having a single-layer structure composed of a release liner, a film having a single-layer structure composed of a protective layer, a film having a multilayer structure composed of a protective layer / adhesive layer, and the like.

[0020] [First Embodiment of Method for Peeling Laminated Film] In the peeling method of the present invention, when peeling the second film of the laminated film from the first film, the second film is peeled using an operation piece for peeling. This peeling method includes a step of preparing a laminated film with an operation piece for peeling attached thereto, a starting point forming step of forming a peeling starting point between the second film and the first film using the operation piece for peeling, and a peeling step of peeling the second film from the first film. Hereinafter, a specific description will be given.

[0021] [Preparation Step] Prepare a laminated film A with a peeling operation piece 5 attached to the surface of the second film 2. Hereinafter, the laminated film A with the peeling operation piece 5 attached thereto is referred to as "laminated film B with an operation piece".

[0022] [Configuration of Laminated Film with Operation Piece] FIG. 4 is a plan view of the laminated film B with an operation piece, FIG. 5 is an enlarged plan view of the main part thereof, and FIG. 6 is a front view thereof. Referring to FIGS. 4 to 6, the laminated film B with an operation piece includes a first film 1, a second film 2 laminated on the first film 1 so as to be peelable, and a peeling operation piece 5 attached to the surface of the second film 2. The peeling operation piece 5 is attached to the surface of the second film 2 by appropriate adhesion means. The peeling operation piece 5 has an attachment area 6 overlapped on the surface of the second film 2 and attached to the surface of the second film 2, a non-attachment area 7 integrally connected to the attachment area 6 and extending outside the first side 2a of the second film 2, and a first edge 7a of the non-attachment area 7 extending obliquely with respect to the first side 2a of the second film 2.

[0023] 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 thereof include porous films such as resin films, papers, synthetic papers, and woven fabrics, and foamed resin films. The peeling operation piece 5 is preferably formed using a film piece that is stronger than the second film 2. Such film pieces include polyester-based films such as polyethylene terephthalate because they are general-purpose. The thickness of the peeling operation piece 5 is not particularly limited, but if it is too small, the mechanical strength will be insufficient, and if it is too large, the peeling operation piece 5 may be difficult to bend. From this perspective, the thickness of the peeling operation piece 5 is, for example, 20 μm to 100 μm, preferably 30 μm to 60 μm.

[0024] The planar shape of the peeling operation piece 5 is, for example, an elongated strip shape (rectangular shape) as shown in FIGS. 4 and 5. However, the planar shape of the peeling operation piece 5 is not limited to a rectangular shape and may be changed as appropriate. The attachment region 6 of the peeling operation piece 5 is a region that is overlapped on the surface of the second film 2, and a part or all of which is attached to the surface of the second film 2. The non-attachment region 7 of the peeling operation piece 5 is a region that is not overlapped on the surface of the second film 2 and is a region that extends outward from the first side 2a of the second film 2. The peeling operation piece 5 formed from one film piece has the attachment region 6 and the non-attachment region 7 continuously provided integrally. The peeling operation piece 5 has one edge along the longitudinal direction (in this specification, this edge is referred to as the "first edge") and an edge along the longitudinal direction on the opposite side of the first edge (in this specification, this 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 and the second edge are parallel. However, it is also possible to use a peeling operation piece 5 that is not rectangular in plan view. For a peeling operation piece 5 that is not rectangular in plan view, the first edge and the second edge may not be linear, and the first edge and the second edge may not be parallel. Note that since the attachment area 6 and the non-attachment area 7 are integrally connected, the first edge of the peeling operation piece 5 is equal to the continuous one of the first edge 6a of the attachment area 6 and the first edge 7a of the non-attachment area 7. Similarly, the second edge of the peeling operation piece 5 is equal to the continuous one of the second edge 6b of the attachment area 6 and the second edge 7b of the non-attachment area 7.

[0025] The peeling operation piece 5 is attached to the surface of the second film 2 such that the first edge 7a of the non-attachment area 7 intersects the first side 2a of the second film 2 at an angle in a plan view. In a plan view, the angle α formed by the first edge 7a of the non-attachment 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-attachment area 7) can be appropriately set within a range greater than 0 degrees and less than 180 degrees. For example, it may be an obtuse angle, or a right angle, or an acute angle. As will be described later, when the outer end portion of the peeling operation piece 5 is shifted, a peeling start point is likely to occur. Therefore, the angle α is preferably an acute angle. Specifically, the preferred angle α is 10 degrees to 60 degrees, and more preferably 20 degrees to 45 degrees.

[0026] The attachment area 6 of the peeling operation piece 5 may be attached to a position overlapping the corner portion 21 of the second film 2, but preferably, as shown in FIGS. 4 and 5, it is attached in the vicinity of the corner portion 21 without overlapping the corner portion 21 of the second film 2. Therefore, both the first edge and the second edge of the peeling operation piece 5 intersect the first side 2a of the second film 2. Hereinafter, the intersection point of the first edge of the peeling operation piece 5 and the first side 2a of the second film 2 is referred to as "first intersection point p1", and the intersection point of the second edge of the peeling operation piece 5 and the first side 2a of the second film 2 is referred to as "second intersection point p2". Note that the first intersection point p1 is also the intersection point of the first edge 7a of the non-attachment area 7 and the first side 2a of the second film 2, and the intersection point of the first edge 6a of the attachment area 6 and the first side 2a of the second film 2. Similarly, the second intersection point p2 is also the intersection point of the second edge 7b of the non-attachment area 7 and the first side 2a of the second film 2, and the intersection point of the second edge 6b of the attachment area 6 and the first side 2a of the second film 2.

[0027] Specifically, referring to FIG. 5, the peeling operation piece 5 is attached such that the length L1 between the corner portion 21 of the second film 2 and the first intersection point p1 is 1 mm to 10 mm, preferably 2 mm to 7 mm, more preferably 3 mm to 5 mm. The length L2 of the peeling operation piece 5 is not particularly limited. For example, it is 20 mm to 50 mm, preferably 25 mm to 40 mm. Also, the width L3 of the peeling operation piece 5 is not particularly limited either. However, if it is too small, the force to lift the second film 2 may become weak due to the deflection of the non-adhesive region 7, and if it is too large, the amount of deflection of the non-adhesive region 7 may become small. From this perspective, the width L3 of the peeling operation piece 5 is, for example, 3 mm to 20 mm, preferably 4 mm to 15 mm, more preferably 5 mm to 10 mm. Further, the peeling operation piece 5 is attached such that the length L4 between the first intersection point 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.

[0028] The adhesive region 6 of the peeling operation piece 5 is attached to the surface of the second film 2 via an adhesive 4 which is an example of an adhesion means. As the adhesive 4, for example, an adhesive agent, an adhesive, etc. can be used. Note that the adhesive agent and the adhesive are common in that they can adhere the two films by intervening between the two films. However, the adhesive agent is different from the adhesive which cannot be reattached after peeling in that it can maintain adhesiveness for a long period and can be reattached after peeling. The adhesive region 6 of the peeling operation piece 5 may be attached to the surface of the second film 2 in a peelable state, or may be firmly attached to the surface of the second film 2 in a difficult-to-peel state. A part of the adhesive region 6 overlaid on the surface of the second film 2 may be adhered to the second film 2, or all of it may be adhered to the second film 2.

[0029] In the example shown in FIG. 5, the entire attachment area 6 is adhered to the surface of the second film 2 via the adhesive 4. In the plan view shown in FIG. 5, for the sake of convenience, innumerable dots are added to the area where the adhesive 4 is provided. Hereinafter, in other plan views as well, the locations where innumerable dots are added indicate the area where the adhesive 4 is provided. As shown in FIG. 5, the entire attachment area 6 is adhered 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 attachment area 6 to the parallel line passing through the first intersection point p1. Note that the parallel line means a line parallel to the width edge 6d of the attachment area 6. Therefore, the adhesion portion of the attachment area 6 to the second film 2 extends over the entire first side 2a of the second film 2 in the overlapping range of the attachment area 6. In other words, the attachment area 6 is adhered in the range surrounded by the width edge 6d, the first intersection point p1, and the second intersection point p2. In FIG. 5, a part of the adhesive 4 protrudes outside the first side 2a of the second film 2. However, since the peeling operation piece 5 is used when peeling the second film 2, even if the adhesive 4 protrudes, it does not cause any hindrance to the peeling of the second film 2.

[0030] The adhesion portion of the attachment area 6 to the second film 2 is not limited to the example shown in FIG. 5 and can be changed as appropriate. FIG. 7 is an enlarged plan view of the main part showing some other examples of the adhesion portion. In the other example shown in FIG. 7(a), the entire attachment area 6 is adhered to the surface of the second film 2 via the adhesive 4. The adhesive 4 (dots are added to the area where the adhesive 4 is provided) is provided in the range from the width edge 6d of the attachment area 6 to the first side 2a of the second film 2. Therefore, the adhesion portion of the attachment area 6 to the second film 2 extends over the entire first side 2a of the second film 2 in the overlapping range of the attachment area 6. In other words, the attachment area 6 is adhered in the range surrounded by the width edge 6d, the first intersection point p1, and the second intersection point p2. In another example shown in Fig. 7(b), a part of the attachment area 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 attachment area 6 to a parallel line passing through the midpoint p3 between the first intersection point p1 and the second intersection point p2. Therefore, the adhered portion of the attachment area 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 Fig. 7(b), although a part of the adhesive 4 protrudes outside the first side 2a of the second film 2, it does not interfere with the peeling of the second film 2 in the same manner as above. In another example shown in Fig. 7(c), the adhesive 4 is provided in a range from the width edge 6d of the attachment area 6 to a parallel line passing through the second intersection point p2. Therefore, the adhered portion of the attachment area 6 to the second film 2 reaches the first side 2a of the second film 2 at the second intersection point p2.

[0031] Note that the adhesive strength of the adhered portion of the attachment area 6 to the second film 2 is greater than the above adhesive strength (1). By satisfying this relationship, when peeling the second film 2 using the peeling operation piece 5 as described later, the second film 2 can be pulled out without the peeling operation piece 5 being peeled off from the second film 2.

[0032] <<Production of the laminated film with an operation piece>> The laminated film B with an operation piece is obtained by attaching the peeling operation piece 5 to the surface of the second film 2 of the laminated film A. The attachment of the peeling operation piece 5 may be performed manually or mechanically.

[0033] Here, an example of mechanically attaching the peeling operation piece 5 to the laminated film A will be described. FIG. 8 is a plan view of the workbench 8. The workbench 8 has a flat mounting surface portion 81 on which the laminated film A is placed, and fixing means for fixing the laminated film A placed on the mounting surface portion 81. In FIG. 8, the laminated film A is represented by a two-dot chain line which is a virtual line. The fixing means can fix the laminated film A placed on the mounting surface portion 81 so that it does not move inadvertently when the peeling operation piece 5 is attached to the laminated film A, and can release the fixing so that the laminated film A can be removed from the mounting surface portion 81. The fixing means is not particularly limited. For example, a mechanism for adsorbing the laminated film A with air can be used. The fixing means for adsorbing the laminated film A has, for example, a plurality of ventilation holes 82 formed in the mounting surface portion 81, a closed cavity portion (not shown) provided on the back side of the mounting surface portion 81, and a suction machine (not shown) for sucking the air in the closed cavity portion. The mounting surface portion 81 is usually larger in area than the laminated film A, and the laminated film A is placed in a predetermined region of the mounting surface portion 81. A plurality of the ventilation holes 82 are provided at a predetermined interval within the region where the laminated film A is placed. By sucking the air in the closed cavity portion by a suction machine such as a vacuum pump, the inside of the closed cavity portion becomes a negative pressure, and the laminated film A is attracted and fixed to the mounting surface portion 81 through the ventilation holes 82. On the other hand, when the suction by the suction machine stops, 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 mounting surface portion 81.

[0034] The peeling operation piece 5 is attached to the laminated film A fixed to the placement surface portion 81 of the workbench 8. As described above, the adhesive 4 is provided on the back surface of the attachment region 6 of the peeling operation piece 5. For example, as shown in FIG. 9, the peeling operation piece 5 is attached to the laminated film A using an attaching device. The attaching device includes a support shaft 91 extending in the vertical direction, a chuck portion 92 that grips the outer end portion 71 of the non-attachment region 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. The outer end portion 71 of the non-attachment region 7 is gripped 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 attachment region 6 of the peeling operation piece 5 is adhered to the surface of the laminated film A (the surface of the second film 2), whereby a laminated film B with an operation piece as shown in FIGS. 4 to 6 is obtained. After the adhesive 4 in the attachment region 6 is attached to the surface of the laminated film A, if necessary, the attachment region 6 can be firmly attached to the laminated film A by pressing the upper part of the attachment region 6 with a pressing member (not shown).

[0035] <Starting point forming step> Next, for the laminated film B with the operation piece, a peeling starting point is formed between the second film 2 and the first film 1 using the peeling operation piece 5. The peeling of the second film 2 may be performed manually or mechanically, but usually it is performed mechanically. As described above, the laminated film B with the operation piece is fixed on the workbench 8 by the fixing means. As shown in FIGS. 10 and 11, the outer end portion 71 of the non - sticking region 7 of the peeling operation piece 5 is grasped by the chuck portion of the peeling device. In the illustrated example, the pasting device is used as the peeling device. That is, the pasting device 9 serves as both a device for pasting the peeling operation piece 5 on the laminated film A and a peeling device for peeling the second film 2 using the peeling operation piece 5. However, the pasting device and the peeling device may use separate devices. In this case, after the peeling operation piece 5 is pasted on the laminated film A by the pasting device to produce the laminated film B with the operation piece, the pasting device is separated from the peeling operation piece 5, and then the outer end portion 71 of the peeling operation piece 5 may be grasped by the chuck portion of another peeling device.

[0036] Referring to FIGS. 10 and 11, the peeling device (the peeling device that also serves as the pasting 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 is rotatable around 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. Driven by the rotation of the support shaft 91, 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. Hereinafter, the plane parallel to the surface of the second film 2 may be referred to as the "parallel plane". Further, the support shaft 91 and the chuck portion 92 driven by the support shaft 91 can move in the vertical direction Z by the operation of the drive portion. Furthermore, the support shaft 91 and the chuck portion 92 driven by the support shaft 91 can move parallel in any direction within the parallel plane by the operation of the drive portion. That is, the support shaft 91 and the chuck portion 92 driven by the support shaft 91 can move in the horizontal direction X, the vertical direction Y, and the direction V inclined with respect to the horizontal direction X or the vertical direction Y within the parallel plane, respectively.

[0037] The operation-ready laminated film B is fixed to the placement surface portion 81 of the workbench 8 via fixing means. As shown in FIGS. 10 and 11, the chuck portion 92 of the peeling device grips the outer end portion 71 of the non-adhesive region 7 of the peeling operation piece 5. In the illustrated example, as the chuck portion 92, a clip type that sandwiches the front and back surfaces of the outer end portion 71 of the non-adhesive region 7 is exemplified, but the chuck portion 92 is not limited to this type. The gripping margin of the outer end portion 71 by the chuck portion 92 is not particularly limited, but if it is too large, the freely movable portion of the non-adhesive region 7 will be reduced, and if it is too small, the outer end portion 71 may come off the chuck portion 92. From such a viewpoint, the gripping margin L5 of the outer end portion 71 by the chuck portion 92 is preferably up to a portion about 2 mm to 5 mm away from the width edge 7d of the non-adhesive region 7. Also, the length L6 from the gripping end of the chuck portion 92 to the second intersection point p2 is not particularly limited, but in order for the non-adhesive region 7 to bend well, it is 12 mm to 40 mm, preferably 15 mm to 30 mm.

[0038] Move the support shaft 91 to move the chuck portion 92, and shift the outer end portion 71 of the non-adhesive region 7 gripped by the chuck portion 92 toward the first edge 7a. For example, shift the outer end portion 71 of the non-adhesive region 7 gripped by the chuck portion 92 along a parallel plane toward the first edge 7a. 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. Shifting the outer end portion 71 toward the first edge 7a also means shifting it to the side opposite to the second edge 7b of the non-adhesive region 7 in the width direction W. The operation of shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a includes, in the plan view shown in FIG. 10, the operation of shifting the outer end portion 71 in a direction G1 orthogonal to the first edge 7a or in a direction G2 forming an acute angle β with 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 shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a includes the operation of rotationally moving the outer end portion 71 along a parallel plane toward the first edge 7a.

[0039] FIG. 12 is an enlarged plan view of the main part when the outer end portion 71 of the non-adhesive region 7 is shifted to generate a peeling start point, FIG. 13 is a side view thereof, and FIG. 14 is a reference perspective view thereof. In FIG. 12, the chuck portion 92 before shifting the outer end portion 71 of the non-adhesive region 7 is represented by a two-dot chain line. The operation of shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a includes, as described above, an operation of shifting along a parallel plane (a plane parallel to the surface of the second film 2). In FIG. 13, the parallel plane F (a plane parallel to the surface of the second film 2) is represented by a one-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. From another perspective, the operation of shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a includes 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 bends as described later.

[0040] <<Rotational movement>> As shown in FIGS. 12 to 14, the operation of rotationally moving is to rotate the outer end portion 71 toward the first edge 7a in the parallel plane F (for the parallel plane F, refer to FIG. 13). In other words, the operation of rotationally moving is to rotate the outer end portion 71 to the side opposite to the second edge 7b (that is, the first edge 7a side of the non-adhesive region 7). In FIG. 12 showing the state during the rotational movement, the chuck portion 92 indicated by the two-dot chain line at the initial position (the position before moving) has moved to the position of the chuck portion 92 indicated by the solid line by the rotational movement T1 indicated by the arrow. The rotation center of the rotational movement of the outer end portion 71 is the axis 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 shown in FIG. 10. 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 movement distance L7 of the outer end portion 71 is a straight-line length and is about 3 mm to 15 mm.

[0041] By shifting the outer end portion 71 of the non - sticking region 7 along the parallel plane F toward the first edge 7a, the non - sticking region 7 is caused to bend. Specifically, by shifting the outer end portion 71 along the parallel plane F toward the first edge 7a, as shown in FIGS. 12 to 14, the non - sticking region 7 bulges upward like a wave and deforms. Here, the upward direction refers to the direction away from the surface of the second film 2 in the vertical direction Z. When the non - sticking region 7 bends, the first edge 7a and the second edge 7b of the non - sticking region 7 also deform. When the outer end portion 71 is shifted toward the first edge 7a to bend the non - sticking region 7 upward, the second edge 7b of the non - sticking region 7 on the side opposite to the first edge 7a is pulled. Therefore, at the second intersection point p2 (the intersection point of the second edge 7b of the non - sticking region 7 and the first side 2a of the second film 2) and in the vicinity thereof, the second film 2 lifts from the first film 1, and a peeling starting point S is generated between the second film 2 and the first film 1.

[0042] In FIGS. 13 and 14, a laminated film A (the laminated film A in FIG. 3) having a layer structure of the first film 1 / adhesive layer 3 / second film 2 in order from the lower side is exemplified, and the laminated film A is peelable at the interface 1 - 3 between the first film 1 and the adhesive layer 3. Since the second film 2 is peeled from the first film 1 with the adhesive layer 3 in this laminated film A, a peeling starting point S is generated at the interface 1 - 3 between the first film 1 and the adhesive layer 3.

[0043] Conventionally, when a peeling operation piece is attached orthogonally to one side of a film and the peeling operation piece is inverted, a force for pulling up the film acts over the entire width of the peeling operation piece. When a force for pulling up the film acts over the entire width of the peeling operation piece in this way, there is a probability that peeling errors such as the peeling operation piece being peeled from the film occur before the peeling starting point is generated due to the dispersion of the force. In this regard, as described above, by shifting the outer end portion 71 of the non - sticking region 7 of the peeling operation piece 5 toward the first edge 7a, the pulling - up force is likely to concentrate on the second intersection point p2, and a peeling starting point S is surely generated between the second film 2 and the first film 1.

[0044] <Peeling process> After forming the peeling start point S, pull out the peeling operation piece 5 to peel the second film 2 from the first film 1. Figures 15 and 16 show the process of pulling out the peeling operation piece 5. In Figures 15 and 16, only the chuck part 92 (not showing the support shaft 91 and the arm part 93) of the peeling device is shown. As shown in Figure 15, while lifting the outer end 71 of the non-adhesive area 7 of the peeling operation piece 5 upward, invert the non-adhesive area 7. Further, as shown in Figure 16, while inverting the non-adhesive area 7, pull out the outer end 71 of the non-adhesive area 7 along the surface of the second film 2. When the second film 2 is rectangular and the peeling operation piece 5 is arranged near the corner 21, it is preferable to pull out the outer end 71 of the non-adhesive area 7 in the diagonal direction of the second film 2 while inverting the non-adhesive area 7. By pulling out in the diagonal direction, the second film 2 can be peeled off neatly.

[0045] 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 from the surface of the first film 1 from the peeling start point S. In particular, since the adhesive area 6 of the peeling operation piece 5 does not overlap the corner 21 of the second film 2 and is attached near the corner 21 of the second film 2, when the non-adhesive area 7 is lifted upward, the vicinity of the corner 21 of the second film 2 can be easily peeled from the first film 1. Furthermore, since the attachment area 6 of the peeling operation piece 5 is attached 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 peeling the second film 2, it is possible to prevent the laminated film A (the first film 1) from separating from or shifting from the workbench 8. As a fixing means, when using a suction method for sucking the laminated film A, the vicinity of the laminated film A facing the vent hole 82 is directly sucked by the vent hole 82, but the vicinity not facing the vent hole 82 is not directly sucked. If the laminated film A can be placed on the placement surface portion 81 such that the vent hole 82 is located at the corner of the laminated film A, the corner can be directly sucked by the vent hole 82. However, in an actual apparatus, due to the number and formation position of the vent holes 82, the size of the laminated film A, etc., it may be difficult to place the laminated film A on the placement surface portion 81 such that the corner of the laminated film A faces the vent hole 82. And when the peeling operation piece 5 is attached so as to overlap the corner portion 21 (the corner portion of the laminated film A) of the second film 2, when peeling the second film 2 using the peeling operation piece 5, the corner portion of the laminated film A may lift from the placement surface portion 81, and there is a risk that peeling cannot be performed between the second film 2 and the first film 1. In this regard, by attaching the attachment area 6 of the peeling operation piece 5 near the corner portion 21 of the second film 2, a peeling starting point S can be surely formed, and the second film 2 can be easily peeled from the first film 1.

[0046] After peeling the second film 2, an arbitrary process is performed on the first film 1. Examples of the arbitrary process include (a) laminating an arbitrary other film to the first film 1, (b) performing a surface treatment on the first film 1, (c) forming an arbitrary layer on the first film 1, (d) performing a cutting process on the first film 1, and the like. Also, after peeling the second film 2, the second film 2 may be laminated again. For example, after peeling the second film 2, the state of the first film 1 is inspected, and the second film 2 is laminated again on the surface of the inspected first film 1. After peeling off the second film 2, the first film 1 can be removed from the workbench 8 by releasing the fixing means of the workbench 8.

[0047] [Second Embodiment of the Method for Peeling a Laminated Film] 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, the operation of rotationally moving the outer end portion 71 along the parallel plane F was exemplified. However, the present invention is not limited thereto, and can be appropriately modified in design. 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, the operation of linearly moving the outer end portion 71 along a parallel plane is exemplified. Prepare the operation-piece-attached laminated film B as described in the above <Preparation Step> column, and grasp the outer end portion 71 of the non-adhesive region 7 with the chuck portion 92 of the peeling device as described in the above <Starting Point Formation Step> column.

[0048] [[Linear Movement]] As shown in FIG. 17, the outer end portion 71 of the non-adhesive region 7 is linearly moved within the parallel plane. In FIG. 17 showing the state during the linear operation, the chuck portion 92 and the support shaft 91 indicated by the two-dot chain line at the initial position (the position before movement) have moved to the positions of the chuck portion 92 and the support shaft 91 indicated by the solid line by the linear movement T2 in the direction indicated by the arrow. The moving direction of the outer end portion 71 may be set to the direction G1 or the direction G2 shown in FIG. 10. Further, the moving distance L7 of the outer end portion 71 is about 3 mm to 15 mm in terms of the linear length.

[0049] In the operation of rotationally moving the outer end portion 71 as in the above first embodiment, the locus of the outer end portion 71 describes an arc. In the case of the present embodiment, the locus of the outer end portion 71 is a straight line. The present embodiment is different from the above first embodiment in this regard, and is the same as the above first embodiment in other respects. Also in the present embodiment, by shifting the outer end portion 71 of the non-adhesive region 7 toward the first edge 7a, a peeling starting point S is generated at the second intersection point p2 and its vicinity. Afterwards, as described in the <Peeling Process> section, the second film 2 can be peeled off from the first film 1 by pulling it out while inverting the non-adhesive area 7.

[0050] [Third Embodiment of the Method for Peeling a Laminated Film] In the above first and second embodiments, the operation of shifting the outer end portion 71 of the non-adhesive area 7 toward the first edge 7a was exemplified. In addition to this, the outer end portion 71 may be moved upward (in a direction away from the surface of the second film 2), and further, the outer end portion 71 may be moved toward the second film side. In the third embodiment, the operation of the outer end portion 71 of the non-adhesive area 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 area 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. Prepare the laminated film B with an operating piece as described in the <Preparation Process> section, and grasp the outer end portion 71 of the non-adhesive area 7 with the chuck portion 92 of the peeling device as described in the <Starting Point Formation Process> section.

[0051] [[Rotation Movement + Upward Movement + Parallel Movement]] As shown in FIGS. 18 and 19, the outer end portion 71 of the non-adhesive area 7 is moved upward along the vertical direction while being rotationally moved along the parallel plane F, 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 FIGS. 18 and 19 showing the states during the operations of the rotation, upward movement, and parallel movement, the chuck portion 92, the support shaft 91, and the arm portion 93 indicated by the two-dot chain line at the initial position (the position before being moved) are moved to the positions of the chuck portion 92, the support shaft 91, and the arm portion 93 indicated 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. By moving the outer end portion 71 of the non - sticking region 7 upward while rotating it along a parallel plane as in this embodiment, the second edge 7b of the non - sticking region 7, which is on the side opposite to the first edge 7a, is pulled up, so that the peeling starting point S is more surely generated. Further, it is preferable to simultaneously perform an operation of moving the outer end portion 71 parallel to the second film 2 side during the rotational movement of the outer end portion 71 and the upward movement of the outer end portion 71, so that a large peeling starting point S is generated. Afterwards, as described in the <peeling process> section above, the second film 2 can be peeled off from the first film 1 by pulling it out while inverting the non - sticking region 7.

[0052] In this embodiment, the outer end portion 71 of the non - sticking region 7 may be moved upward while linearly moving within a parallel plane as in the second embodiment. Further, the outer end portion 71 of the non - sticking region 7 may be moved parallel to the second film 2 side along the parallel plane while linearly moving within the parallel plane as in the second embodiment.

Explanation of reference numerals

[0053] 1 First film 2 Second film 2a First side of the second film 2b Second side of the second film 21 Corner portion of the second film 5 Peeling operation piece 6 Affixed region of the peeling operation piece 7 Non - affixed region of the peeling operation piece 7a First edge of the non - affixed region 7b Second edge of the non - affixed region 7 71 Outer end portion of the non - affixed region 92 Chuck portion A Laminated film S Peeling starting point

Claims

1. In a method for peeling a second film from a first film of a laminated film having a first film and a second film laminated on the first film in a peelable manner, An operation piece for peeling is attached to the surface of the second film, The operation piece for peeling has an attachment area that is overlapped on the surface of the second film and attached to the surface of the second film, a non-attachment area that is integrally connected to the attachment area and extends outside a first side of the second film, and a first edge of the non-attachment area that extends obliquely with respect to the first side of the second film. A method for peeling a laminated film, comprising generating a peeling start point between the second film and the first film by grasping an outer end portion of the non-attachment area and shifting the outer end portion of the non-attachment area toward the first edge side.

2. The method for peeling a laminated film according to claim 1, wherein the outer end portion of the non-attachment area is shifted toward the first edge side along a plane parallel to the surface of the second film.

3. The method for peeling a laminated film according to claim 1, wherein the outer end portion of the non-attachment area 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 portion of the non-attachment area 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.

5. The method for peeling a laminated film according to claim 1, wherein the outer end portion of the non-attachment area is moved toward the second film side while being rotationally moved 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, wherein an angle formed by the first edge of the non-attachment area and the first side of the second film is an acute angle.

7. The second film has a second side extending in a direction orthogonal to the first side, The peeling method of the laminated film according to any one of claims 1 to 5, wherein the sticking area of the peeling operation piece is stuck in the vicinity of the corner formed by the first side and the second side of the second film.

8. The peeling method of the laminated film according to any one of claims 1 to 5, wherein after generating the peeling start point, the non-sticking area is pulled out along the surface of the second film while being inverted.

9. The second film is rectangular, the sticking area of the peeling operation piece is stuck in the vicinity of the corner of the second film, The peeling method of the laminated film according to claim 8, wherein the non-sticking area is pulled out in the diagonal direction of the second film while being inverted.

10. An apparatus for implementing the method according to claim 1, comprising a chuck part for gripping the outer end part of the peeling operation piece, and a driving part for moving the chuck part, the peeling apparatus for the laminated film.

Images