CN117067277A

CN117067277A - Method for cutting film material

Info

Publication number: CN117067277A
Application number: CN202310526777.0A
Authority: CN
Inventors: 平冈慎哉
Original assignee: Nitto Denko Corp
Current assignee: Nitto Denko Corp
Priority date: 2022-05-16
Filing date: 2023-05-11
Publication date: 2023-11-17
Also published as: TW202348381A; KR20230160174A

Abstract

The present invention can prevent the adhesion agent of the adhesive layer from reattaching on the cut end surface when cutting the film material with the first film, the adhesive layer and the second film. In a method for cutting a film material (1) having a first film (11), a second film (12) and an adhesive layer (15) provided between the first film (11) and the second film (12) to obtain a right film (A) and a left film (B) as 2 films, a separating force for separating the right film (A) from the left film (B) is applied to at least one of the right film (A) and the left film (B) immediately before or simultaneously with cutting the film material (1).

Description

Method for cutting film material

Technical Field

The present invention relates to a method for cutting a film material including an adhesive layer.

Background

Conventionally, products having an adhesive layer provided on a film have been used for various purposes.

For example, an optical film product to be attached to a screen of an image display device is generally obtained by cutting a film material having an optical film, an adhesive layer, and a release liner against the shape of the screen.

Disclosure of Invention

When the film material is cut, 2 films are produced, but the cut end surfaces of the 2 films face each other, so that the adhesive of the adhesive layer of the 2 films may be reattached to the cut end surfaces. If the adhesive is reattached to the cut end surface, the adhesive cannot be cleanly separated from the cut end surface when one film sheet is pulled away from the other film sheet, and the attached adhesive is pulled and torn. Therefore, there is a possibility that the adhesive, which is elongated like a wire, adheres to the surface or the like of the film sheet, and the film sheet or the periphery thereof is contaminated with the adhesive.

Problems to be solved by the invention

The purpose of the present invention is to provide a method for cutting a film material, which can prevent adhesive from reattaching on the cut end surfaces of 2 films (right film and left film) obtained by cutting a film material having a first film, an adhesive layer and a second film.

Means for solving the problems

In the method of cutting a film material having a first film, a second film, and an adhesive layer provided between the first film and the second film to obtain 2 films, namely, a right film and a left film, a separating force for separating the right film from the left film is applied to at least one of the right film and the left film immediately before or simultaneously with cutting the film material.

In a preferred cutting method according to the present invention, the film is cut by lowering a cutting blade vertically movable relative to the surface of the film and pressing the cutting blade into the film, and a separating member for applying the separating force to the right film is provided on one side in the width direction of the cutting blade.

In a preferred cutting method according to the present invention, the lower end of the separating member is brought into contact with the surface of the right diaphragm immediately before or simultaneously with cutting of the film material by the cutter, and the separating member applies the separating force to the right diaphragm.

In a preferred cutting method of the present invention, the separating member has an elastic body and protrudes downward obliquely with respect to an axial direction of the cutting blade.

In a preferred cutting method of the present invention, a second separating member for applying the separating force to the left diaphragm is provided on the opposite side of the cutting blade in the width direction.

In a preferred cutting method of the present invention, the first film of the film material includes a polarizing film.

Effects of the invention

In the cutting method of the present invention, since a separating force acts on at least one of the right diaphragm and the left diaphragm, the right diaphragm and the left diaphragm are separated while the film material is cut into the right diaphragm and the left diaphragm. Therefore, the adhesive of the adhesive layer can be prevented from reattaching to the cut end surfaces of the right and left diaphragms, and contamination of the diaphragms or the like with the adhesive can be prevented.

Drawings

Fig. 1 is a top view of a film.

Fig. 2 is a side view showing an example of 1 layer structure of the film material.

Fig. 3 is a side view showing another layer configuration example of the film material.

Fig. 4 is a plan view of the cutting device for the film material.

Fig. 5 is a side view of the cutoff device.

Fig. 6 is a perspective view of the cutoff device.

Fig. 7 is a side view showing a state in which the lower end of the separation member is in contact with the film material when the cutter blade is lowered, and the separation force starts to act on the film material.

Fig. 8 is a side view showing a state in which the cutting blade is further lowered and the edge of the cutting blade starts to enter the film material.

Fig. 9 is a side view showing a state in which the film material is cut into 2 films (right film and left film) by a cutter.

Fig. 10 is a side view of a modification example cutting device.

Fig. 11 is a side view of a cutting device according to another modification.

Fig. 12 is a side view of a cutting device according to another modification.

Description of symbols

A right diaphragm

B left diaphragm

1 film material

11 first film

15. 151, 152 adhesive layer

12 second film

3 cut-off device

5 cutting knife

61 on one side in the width direction

62 on opposite sides in the width direction

F1, F2 separation force

Detailed Description

In the present specification, "planar view" refers to a view from the vertical direction with respect to the surface of the object, and "planar view" refer to a shape of the object and the drawing when viewed from the vertical direction with respect to the surface of the object. In the present specification, "side view" means that the cutting blade is seen from the extending direction side toward the opposite side, and "side view" mean that the cutting blade is seen from the extending direction side toward the opposite side.

In the present specification, the expression "substantially" means a range allowed in the technical field including the present invention. In the present specification, when a plurality of numerical ranges are individually described, the numerical ranges indicated by "lower limit value or higher and" upper limit value or lower "are set so that an arbitrary lower limit value and an arbitrary upper limit value can be selected.

[ film Material ]

Fig. 1 shows a top view of a film 1.

The film material 1 is a cutting object. The film material 1 may or may not have flexibility. The flexibility means bending by the self weight of the film or bending by a small load.

The planar shape of the film material 1 to be cut is not particularly limited, and may be any shape such as a sheet shape or a long strip shape. Fig. 1 illustrates a sheet-like film 1 having a substantially rectangular shape in plan view.

By cutting the film material 1, a product or an intermediate of the product can be obtained. The intermediate of the above-mentioned product is an intermediate for producing a product, and the product can be obtained by further cutting the intermediate and/or subjecting the intermediate to any suitable treatment.

The product is formed into a predetermined planar shape according to specifications and the like. The shape of the product in plan view is not particularly limited. For example, the planar shape of the product may be a substantially rectangular shape (a substantially rectangular shape or a substantially square shape), a substantially polygonal shape such as a substantially triangular shape or a substantially hexagonal shape, a substantially circular shape, a substantially elliptical shape, a shape obtained by combining these shapes, or an arbitrary irregular shape. The "substantially" of the substantially rectangular shape, the substantially triangular shape, and the substantially polygonal shape includes, for example, a shape in which corners are chamfered, a shape in which a part of sides is slightly bulged or depressed, a shape in which sides are slightly curved, and the like. The "substantially" of the substantially circular shape and the substantially elliptical shape includes, for example, a shape in which a part of the circumference is slightly bulged or recessed, a shape in which a part of the circumference is slightly formed into a straight line or an oblique line, and the like.

In fig. 1, the direction along the short side of the substantially rectangular film material 1 is set as the first direction, but the direction along the long side may be set as the first direction, or the direction inclined with respect to the long side may be set as the first direction. The first direction (and the second direction orthogonal to the first direction) may be any direction within the plane of the film material 1.

The application of the product is not particularly limited. Examples of the product obtained from the film material 1 include an optical component or a mechanical component incorporated into a screen of an image display device, a lens of sunglasses, or the like; sealing materials such as adhesive labels; packaging materials such as packaging films; electromagnetic wave shielding and other electrical components. In particular, since high cleanliness is required, the method of the present invention is preferably applied to form an article for optical parts.

From the viewpoint of layer constitution, the film material has a first film, a second film, and an adhesive layer provided between the first film and the second film. The film material 1 may further have another film or layer, provided that it has a laminated structure of the first film/the adhesive layer/the second film.

Several examples of the layer structure of the film material 1 for optical component use are described below by way of example.

Fig. 2 is a side view showing 1 layer configuration example of the film material 1 (the view of the film material 1 viewed from the first direction side), and fig. 3 is a side view showing another layer configuration example of the film material 1. The film 1 is also (although the width is different) identical in layer configuration and end face when viewed from the second direction side, and therefore the drawing thereof is omitted.

The film material 1 shown in fig. 2 has a first film 11, an adhesive layer 15, and a second film 12 in this order from the surface side. Around the film material 1, the end surfaces 11a, 12a of the first film 11 and the second film 12 extend parallel to the end surface 15a of the adhesive layer 15. In other words, the end face 11a of the first film 11 and the end face 15a of the adhesive layer 15 and the end face 12a of the second film 12 continuously form 1 plane. Therefore, the end face of the film material 1 is constituted by a set of the end faces 11a, 15a, 12a of the first film 11, the adhesive layer 15, and the second film 12. In the present specification, the end face is a face along the thickness direction, and the front face and the back face are faces orthogonal to the thickness direction.

The film material 1 shown in fig. 3 has, in order from the surface side, a third film 13, a first adhesive layer 151, a first film 11, a second adhesive layer 152, and a second film 12. Around the film material 1, the end surfaces 11a, 12a, 13a of the first to third films 11, 12, 13 extend parallel to the end surfaces 151a, 152a of the first and second adhesive layers 151, 152. In other words, the end surfaces 11a, 12a, 13a of the films 11, 12, 13 and the end surfaces 151a, 152a of the adhesive layers 151, 152 are continuously formed in 1 plane.

Although not shown, the film material 1 may further include another film and/or an adhesive layer. In the film material 1 having another film and/or adhesive layer, the end face of each film and the end face of each adhesive layer also form 1 plane continuously.

The film material 1 for optical member use includes an optical film. In this case, all of the films such as the first film 11 may be optical films, or at least 1 film selected from a plurality of films may be optical films and at least 1 film may be a film other than the optical films.

In the layer configuration shown in fig. 2, for example, the first film 11 is an optical film, the second film 12 is a release liner (film other than an optical film), and in the layer configuration shown in fig. 3, for example, the first film 11 and the third film 13 are optical films, and the second film 12 is a release liner. In fig. 2, for example, an optical functional film described later is used as the first film 11. In fig. 3, for example, an optical functional film described later is used as the first film 11, and a protective film described later is used as the third film 13. The release liner is releasably adhered to the adhesive layer 15, 152. Thus, the release liner and the adhesive layer 15, 152 are peelable at their interface, but the optical film and the adhesive layer 15, 152 are difficult to peel. In use, the release liner is peeled away and removed. In the case where the third film 13 in fig. 3 is a protective film, the third film 13 may be peeled off from the first film 11 together with the pressure-sensitive adhesive layer 151, or the third film 13 may be bonded to the pressure-sensitive adhesive layer 151 in a state where peeling off from the first film 11 is difficult.

Examples of the optical film include an optical functional film and a protective film. The optical film may have a 1-layer structure or a 2-layer or more multilayer structure. In the case where the optical film has a multilayer structure of 2 or more layers, the optical film may be a laminate obtained by laminating 2 or more layers of films having the same function, or may be a laminate obtained by laminating 2 or more layers of films having different functions. Examples of the laminate of films having different functions include a laminate of a polarizing film and a retardation film, a laminate of a polarizing film and a protective film, and the like.

Examples of the optical functional film include a polarizing film, a retardation film, a light diffusion film, a brightness enhancement film, an antiglare film, and a light reflection film. The polarizing film is a film having a property of transmitting light (polarization) vibrating in a specific 1 direction and blocking light vibrating in other directions. The retardation film is a film exhibiting optical anisotropy, and typically includes, for example, a stretched film of an acrylic resin, a cycloolefin resin, a cellulose resin, or the like. The protective film is a film used for the purpose of protecting the optical functional film. As the protective film, a colorless transparent film is typically used.

The thickness of the optical film is not particularly limited, and is, for example, 5 μm or more and 300 μm or less.

The release liner has a release surface excellent in releasability from the adhesive layer.

Examples of the release liner include resin films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films; paper; porous films such as woven fabrics, nonwoven fabrics, and mesh fabrics; a foamed resin film, and the like. The release liner is preferably a resin film because of excellent surface smoothness. Examples of the resin film include polyethylene terephthalate film, polybutylene terephthalate film, polyethylene film, polypropylene film, polybutylene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyurethane film, and ethylene-vinyl acetate copolymer film.

The thickness of the release liner is not particularly limited, and is, for example, 5 μm or more and 200 μm or less, preferably 10 μm or more and 100 μm or less.

The pressure-sensitive adhesive layer is a layer that has adhesiveness at ordinary temperature and can be reattached while the adhesiveness continues after peeling. The adhesive layer is made of a known adhesive. Examples of the adhesive include colorless and transparent acrylic adhesives, rubber adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyvinylpyrrolidone adhesives, polyacrylamide adhesives, and cellulose adhesives.

In particular, the method of the present invention is effective for a film having an adhesive layer formed of a relatively soft adhesive.

The hardness of the adhesive can be indicated, for example, by the storage modulus of elasticity G'. The soft adhesive has a storage elastic modulus G' at 25℃of 0.001MPa or more and 1MPa or less, preferably 0.01MPa or more and 1MPa or less. The storage modulus of elasticity can be determined by dynamic viscoelasticity measurement. Specifically, the storage modulus G' at 25℃can be calculated by measuring the pressure-sensitive adhesive layer using a dynamic viscoelasticity measuring apparatus (apparatus name "ARES" manufactured by TA Instruments Co.) under the condition of a frequency of 1Hz at a temperature range of-20 to 100℃and a heating rate of 5℃per minute.

The thickness of the pressure-sensitive adhesive layer is not particularly limited, and is, for example, 0.1 μm or more and 50 μm or less, preferably 1 μm or more and 30 μm or less.

[ method of cutting film ]

In the method for cutting the film material of the present invention, a separating force for separating the right film sheet from the left film sheet is applied to at least one of the right film sheet and the left film sheet immediately before or simultaneously with cutting the film material. By applying the separation force immediately before cutting the film material, the right film sheet and the left film sheet are separated at the same time, and therefore the cut end face of the adhesive layer of the right film sheet and the cut end face of the adhesive layer of the left film sheet do not come into contact with each other, and the adhesion of the adhesive can be prevented. Similarly, by applying the separation force while cutting the film material, the cut end face of the adhesive layer of the right film sheet and the cut end face of the adhesive layer of the left film sheet do not come into contact, and the adhesive can be prevented from reattaching.

The right diaphragm is one of 2 diaphragms produced after the diaphragm material is cut, and the left diaphragm is the other. It should be noted that the right and left are merely convenient expressions for distinguishing 2 membranes, and have no special meaning other than the above.

Hereinafter, a film material for use as an optical member will be described as an example.

< device for cutting off film >

Fig. 4 is a schematic plan view of the cutting device 3 for cutting the film material 1, and fig. 5 is a schematic side view of the cutting device 3. Fig. 6 is a schematic perspective view of the cutting device 3 shown except for the platform 4 and the base 7.

The cutting device 3 includes a stage portion 4 on which the film material 1 to be cut is placed, a cutting blade 5 disposed opposite to the stage portion 4, and separating members 61 and 62 for applying a separating force to the film material 1.

In fig. 4 to 6, for convenience, the film material 1 having the first film 11, the adhesive layer 15, and the second film 12 is shown.

The platform 4 has a flat surface on which the film 1 is placed, and a blade receiving portion 41 that allows the blade edge of the cutting blade 5 to enter. For example, the platform portion 4 includes the blade receiving portion 41 and a receiving table 42 provided below the blade receiving portion 41. Since the edge 5a of the cutting blade 5 is in contact with the surface of the blade receiving portion 41, the blade receiving portion 41 is preferably formed of a material that does not damage the edge 5a and is not easily cut by the cutting blade 5. For example, the blade receiving portion 41 is preferably formed of synthetic resin, relatively hard rubber, or the like. For example, steel plate, hard resin, etc. having excellent strength are used as the receiving base 42.

Further, the surface of the blade bearing 41 is preferably smoothed. The smoothing treatment is a treatment for reducing frictional resistance of the surface of the blade bearing portion 41 against the back surface of the film material 1. By smoothing the surface of the blade bearing portion 41, the right diaphragm a and the left diaphragm B become easy to move along the surface of the blade bearing portion 41 by the separating force. Examples of the smoothing treatment include forming a resin layer (not shown) containing a smoothing component on the surface of the blade receiving portion 41 (the surface of the land portion 4). Examples of the smoothing component include inorganic fine particles such as waxes, silicones, and silica, and organic fine particles.

The receiving base 42 is fixed to a frame or the like of the cutting device 3. The blade receiving portion 41 is, for example, sheet-shaped and is disposed on the surface of the receiving table 42.

In the illustrated example, the blade receiving portion 41 is fixedly provided on the surface of the pedestal 42. In the case where the blade bearing portion is in the form of a sheet, the blade bearing portion may be formed in a ring shape (for example, a ring shape such as an endless belt) in a side view, although not particularly shown. The blade bearing portion formed in a ring shape may be made movable by a driving device so as to travel from the front surface to the rear surface of the pedestal.

The cutting blade 5 is disposed above the platform 4 with its blade edge 5a facing the surface of the platform 4. The end of the cutter 5 (the end opposite to the cutter edge 5 a) is fixedly attached to the base 7. The base portion 7 is, for example, flat plate-shaped. The base portion 7 is movable up and down by a driving device (not shown) (white background arrow indicates movement of the base portion 7). The cutter blade 5 fixed to the base portion 7 moves vertically with respect to the surface of the film 1. Therefore, the cutting blade 5 is a pressing type blade that cuts the film 1 by moving downward and separates from the film 1 by moving upward.

The cutting blade 5 is generally configured such that the blade edge 5a is sharp, and the thickness thereof increases from the blade edge 5a toward the base portion 7. The cutting blade 5 extends in the first direction of the film 1 in a plan view shown in fig. 4. The cutting blade 5 extends from at least one edge 1a of the film 1 in the first direction to the opposite edge 1b so as to divide the film 1 into two in 1-pass operation. In the example shown in fig. 4 and 6, the cutting blade 5 extends beyond the edge 1a on the first direction side and the edge 1b on the opposite side of the film material 1. The shape of the cutting blade 5 in plan view may be linear as in the illustrated example, or may be nonlinear although not particularly illustrated.

The cutting blade 5 extends vertically in the axial direction. The axial direction of the cutter 5 is a direction perpendicular to the width direction and the extending direction of the cutter 5. The width direction of the cutter 5 is the same as the thickness direction of the cutter 5.

By cutting the film material 1 with the cutter blade 5, 2 films (right film a and left film B) are produced with the cut portion as a boundary.

A separating member 61 for applying a separating force to the right diaphragm a is provided on one side of the cutter 5 in the width direction. If necessary, a separation member 62 for applying a separation force to the left diaphragm B is provided on the opposite side of the cutting blade 5 in the width direction. The separation force is a force separating the right diaphragm a from the left diaphragm B. Hereinafter, the separation member 61 that causes a separation force to act on the right diaphragm a is referred to as a "first separation member 61", and the separation member 62 that causes a separation force to act on the left diaphragm B is referred to as a "second separation member 62".

Note that, although the right membrane a and the left membrane B are not generated before the membrane material 1 is cut, the right membrane a and the left membrane B to which the first and second separating members 61 and 62 apply separating forces are conceptually equivalent to the right membrane and the left membrane generated after the cutting.

The first separating member 61 has a lower end 61a facing the surface of the platform 4 and is disposed above the platform 4.

For example, the first separating member 61 is fixed at its upper end portion to the base portion 7 on the side of the width direction of the cutoff blade 5 and protrudes downward with its lower end 61a made into a free end. The free end is opened. The first separating member 61 is configured such that a lower end 61a of the first separating member 61 contacts the surface of the right diaphragm a and is offset to one side in the width direction of the cutter 5 when the cutter 5 is lowered. In order to configure this, in the present embodiment, the first separating member 61 is formed of an elastic body, and is inclined so as to deviate to one side in the width direction as going toward the lower end 61a in a side view. For example, the first separating member 61 protrudes downward at an acute angle with respect to the axial direction of the cutoff blade 5 in a side view. In the illustrated example, the entirety of the first separating member 61 is formed of an elastic body, and the entirety of the first separating member 61 is at an acute angle with respect to the axial direction of the cutoff blade 5 in a side view. The inclination angle α1 of the first separation member 61 is not particularly limited as long as it is an acute angle, but is, for example, 5 degrees or more and 60 degrees or less, preferably 10 degrees or more and 45 degrees or less, from the viewpoint of applying a sufficient separation force to the right diaphragm a. The inclination angle α1 of the first separation member 61 refers to an angle formed by the axial direction of the first separation member 61 and the axial direction of the cutoff blade 5 as shown in fig. 5.

In order to apply a separating force to the right membrane sheet a by the first separating member 61 immediately before or simultaneously with cutting the membrane material 1, the lower end 61a of the first separating member 61 is at the same level as the cutting edge 5a of the cutting blade 5 or protrudes downward from the cutting edge 5a of the cutting blade 5. The same level means that the lower end 61a of the first separating member 61 and the cutting edge 5a of the cutting blade 5 are located on a substantially horizontal plane. In the illustrated example, the lower end 61a of the first separating member 61 protrudes downward from the cutting edge 5a of the cutting blade 5. When the cutter blade 5 is lowered, the lower end 61a of the first separating member 61 is brought into contact with the surface of the right film sheet a before the cutter blade 5 by the lower end 61a of the first separating member 61 protruding from the cutter blade 5 a. Therefore, immediately before cutting the film material 1, a separating force is applied to the right diaphragm a by the first separating member 61. On the other hand, when the lower end 61a of the first separating member 61 is at the same level as the blade edge 5a, the cutting blade 5 contacts the film material 1 and the lower end 61a of the first separating member 61 contacts the surface of the right film sheet a when the cutting blade 5 is lowered. Therefore, the first separating member 61 applies a separating force to the right diaphragm a while cutting the film material 1.

The first separation member 61 is formed, for example, of a rectangular parallelepiped plate-like body made of an elastic material, and extends in a first direction of the film material 1 in a plan view (see fig. 6). Since the first separating member 61 is a member for applying a separating force to the right diaphragm a, it is only required to extend from the edge 1a on one side in the first direction to the edge 1b on the opposite side of the film material 1. For example, in the illustrated example, the first separating member 61 extends from the inside of the edge 1a on the first direction side of the film material 1 to the inside of the edge 1b on the opposite side. Although not particularly shown, the first separating member 61 may extend beyond the edge 1a on the first direction side and the edge 1b on the opposite side of the film material 1, respectively.

The second separating member 62 has a lower end 62a facing the surface of the platform 4 and is disposed above the platform 4.

For example, the second separating member 62 is fixed at its upper end portion to the base portion 7 and protrudes downward on the side of the width direction of the cutoff blade 5 and its lower end 62a is made into a free end. The second separating member 62 is configured such that the lower end 62a of the second separating member 62 contacts the surface of the left diaphragm B and is deviated to the opposite side in the width direction of the cutter 5 when the cutter 5 is lowered. In order to configure this, in the present embodiment, the second separation member 62 is formed of an elastic body, and is inclined so as to deviate to the opposite side in the width direction as going toward the lower end 62a in a side view. For example, the second separating member 62 extends downward at an acute angle with respect to the axial direction of the cutoff blade 5 in a side view. In the illustrated example, the entirety of the second separating member 62 is formed of an elastic body, and the entirety of the second separating member 62 is at an acute angle with respect to the axial direction of the cutoff blade 5 in a side view. The inclination angle α2 of the second separation member 62 is not particularly limited as long as it is an acute angle, but is, for example, 5 degrees or more and 60 degrees or less, preferably 10 degrees or more and 45 degrees or less, from the viewpoint of applying a sufficient separation force to the left diaphragm B. The inclination angle α2 of the second separation member 62 refers to an angle formed by the axial direction of the second separation member 62 and the axial direction of the cutoff blade 5 as shown in fig. 5.

In order to apply a separating force to the left film sheet B by the second separating member 62 immediately before or simultaneously with cutting the film material 1, the lower end 62a of the second separating member 62 is at the same level as the cutting edge 5a of the cutting blade 5 or protrudes downward from the cutting edge 5a of the cutting blade 5. In the illustrated example, the lower end 62a of the second separating member 62 protrudes downward from the cutting edge 5a of the cutting blade 5. When the cutter 5 is lowered, the lower end 62a of the second separating member 62 protrudes from the cutter edge 5a, and the lower end 62a of the second separating member 62 comes into contact with the surface of the left film B before the cutter 5. Therefore, immediately before cutting the film material 1, a separating force is applied to the left diaphragm B by the second separating member 62. On the other hand, when the lower end 62a of the second separating member 62 is at the same level as the blade edge 5a, the cutting blade 5 contacts the film material 1 and the lower end 62a of the second separating member 62 contacts the surface of the left film sheet B when the cutting blade 5 is lowered. Therefore, the separation force is applied to the left diaphragm B by the second separation member 62 while the film material 1 is cut.

The second separation member 62 is formed, for example, of a rectangular parallelepiped plate-like body made of an elastic material, and extends in the first direction of the film material 1 in a plan view (see fig. 6). Since the second separation member 62 is a member for applying a separation force to the left diaphragm B, it is only necessary to extend from the edge 1a on one side in the first direction to the edge 1B on the opposite side of the film material 1. For example, in the illustrated example, the second separation member 62 extends from the inside of the edge 1a on the first direction side of the film material 1 to the inside of the edge 1b on the opposite side. Although not particularly shown, the second separation member 62 may extend beyond the edge 1a on the first direction side and the edge 1b on the opposite side of the film material 1, respectively.

Examples of the elastic body forming the first and second separating members 61 and 62 include foamed bodies such as sponge, non-foamed soft synthetic resins, non-foamed rubbers, non-foamed thermoplastic elastomers, and the like.

Examples of the foam include foams obtained by foaming a thermoplastic resin, rubber, a thermoplastic elastomer, or the like.

Examples of the thermoplastic resin or the non-foaming soft synthetic resin include olefin resins such as low-density polyethylene, high-density polyethylene and polypropylene; an alpha-olefin resin such as an ethylene-alpha-olefin copolymer and an ethylene-butene copolymer; ester resins such as polyethylene terephthalate and polybutylene terephthalate; vinyl acetate resins such as ethylene-vinyl acetate copolymers (EVA); styrene resins such AS polystyrene and acrylonitrile styrene resin (AS resin); amide resins such as 6-nylon; vinyl chloride resin; acrylic resins such as polymethyl methacrylate, and the like. Examples of the rubber include synthetic rubbers such as Butadiene Rubber (BR), isoprene Rubber (IR), and Chloroprene (CR); natural Rubber (NR); copolymer rubber such as Styrene Butadiene Rubber (SBR), acrylonitrile butadiene rubber (NBR), and butyl rubber (IIR). Examples of the thermoplastic elastomer include styrene-based elastomers such as styrene-ethylene-butylene-styrene block copolymer (SEBS); ethylene-vinyl acetate copolymer-based elastomer; an olefin elastomer; styrene butadiene styrene copolymer (SBS), urethane-based elastomer; an ester-based elastomer; a fluorine-based elastomer; a silicone-based elastomer; polyamide-based elastomers, and the like.

In terms of the lower ends 61a, 62a of the first and second separating members 61, 62 being deformed and being in close contact with the surfaces of the right diaphragm a and the left diaphragm B, and being capable of imparting a sufficient separating force to the right diaphragm a and the left diaphragm B, a foam such as a sponge is preferably used as the elastic body.

The hardness of the elastic body is not particularly limited, but if too soft, a sufficient separating force may not be imparted to the right diaphragm a and the left diaphragm B by the first and second separating members 61, 62. From the above point of view, the hardness of the elastomer is 10 or more, preferably 15 or more in terms of ASKER C durometer. The upper limit of the hardness of the elastomer is not particularly limited, but is, for example, 70 or less, preferably 60 or less in terms of ASKER C hardness. The ASKER C hardness can be measured at normal temperature and pressure using ASKER rubber durometer C (manufactured by Polymer Co., ltd.).

Specific examples of the elastomer include polyolefin foam torypef (trade name) manufactured by ori (co).

The thickness of the first and second separating members 61, 62 is not particularly limited, but if it is too small, it is possible that sufficient separating force cannot be applied to the right diaphragm a and the left diaphragm B by the first and second separating members 61, 62. From the above point of view, the thickness of each of the first and second separating members 61, 62 is independently, for example, 1mm or more, preferably 3mm or more. The upper limit of the thickness of the first and second separating members 61 and 62 is not particularly limited, but is, for example, 20mm or less, preferably 15mm or less, independently of each other. The thickness of the first and second separating members 61 and 62 means the thickness of the lower portion of each separating member 61 and 62.

The lengths of the first and second separating members 61 and 62 are appropriately set according to the length of the cutter 5 (the length of the cutter 5 refers to the length in the axial direction of the cutter 5).

< cutting off of Membrane Material >

The film material 1 is placed on the surface of the platform 4 of the cutting device 3, and as shown in fig. 7, the base 7 is moved downward to lower the cutting blade 5. The first and second separating members 61 and 62 provided on the base portion 7 are also lowered by the lowering of the cutter 5. Since the lower ends 61a and 62a of the first and second separating members 61 and 62 protrude downward from the cutting edge 5a of the cutting blade 5, the lower ends 61a and 62a are brought into contact with the surfaces of the right and left films a and B before the cutting blade 5. By bringing the first and second separating members 61 and 62 into contact with each other in this manner, the displacement of the film material 1 can be prevented before cutting.

When the base portion 7 is further lowered, the first and second separating members 61 and 62 are pressed against the surfaces of the right diaphragm a and the left diaphragm B.

Since the first separating member 61 protrudes downward obliquely with respect to the axial direction of the cutter 5, the thrust force acts obliquely from above with respect to the right diaphragm a via the first separating member 61, and a component force F1 of the oblique thrust force (hereinafter, referred to as a first component force F1. In fig. 7 and 8, the first component force F1 is indicated by a thin arrow) is applied to the right diaphragm a. Since the first component force F1 is a force directed to one side in the width direction, a separation force (separation force equal to the first component force F1) away from the left diaphragm B acts on the right diaphragm a. Since the second separating member 62 protrudes downward obliquely with respect to the axial direction of the cutoff blade 5, a component force directed to the opposite side in the width direction (hereinafter, referred to as a second component force F2. in fig. 7 and 8, the second component force F2 is indicated by a thin arrow) is applied to the left diaphragm B by the same principle, and therefore, a separating force (the separating force is equal to the second component force F2) away from the right diaphragm a acts on the left diaphragm B.

As shown in fig. 8, when the edge 5a of the cutter 5 starts to enter the film 1, the first and second separating members 61, 62 also press the right film a and the left film B, so that the separating force continues to act on the right film a and the left film B, respectively.

As shown in the drawing, as the base portion 7 descends, the lower ends 61a and 62a of the first and second separation members 61 and 62 deform, come into contact with the surfaces of the right diaphragm a and the left diaphragm B, and shift outward, and the inclination angle of the first and second separation members 61 and 62 increases. However, depending on the material, hardness, and the like of the first and second separating members 61 and 62, the first and second separating members 61 and 62 may be compressed as the base portion 7 is lowered, and the lower ends 61a and 62a of the first and second separating members 61 and 62 may not be displaced outward. As the base portion 7 descends, the separation force (first component force F1 and second component force F2) is applied to the right diaphragm a and the left diaphragm B by the first and second separation members 61 and 62 in either the case where the lower ends 61a and 62a of the first and second separation members 61 and 62 are displaced outward or the case where they are not displaced.

As shown in fig. 9, the right diaphragm a and the left diaphragm B to which the separation force acts are moved in the direction of separating from each other while the film material 1 is cut by the cutter blade 5, and the cut end face e1 of the right diaphragm a and the cut end face e2 of the left diaphragm B are away from each other (in fig. 9, movement of the right diaphragm a and the left diaphragm B is indicated by thick arrows). That is, when the right diaphragm a and the left diaphragm B are generated by cutting, the right diaphragm a moves on the surface of the stage in the width direction while sliding, and the left diaphragm B moves on the surface of the stage in the opposite direction in the width direction while sliding, by the separation forces acting respectively. Therefore, the cut end face e1 of the right diaphragm a and the cut end face e2 of the left diaphragm B are separated at the same time of cutting. The cut end face refers to an end face generated by cutting. After cutting, the base portion 7 is lifted, and the cutting blade 5 is separated from the platform portion 4, whereby the right diaphragm a and the left diaphragm B having the cut end faces e1 and e2 facing away from each other can be obtained.

According to the cutting method of the present invention, the film material 1 is cut into the right film sheet a and the left film sheet B, and the right film sheet a is separated from the left film sheet B, so that the adhesive agent of the adhesive layer 15 can be prevented from reattaching at the cut end faces e1 and e 2. Thus, the front or back surface of the diaphragm A, B and the land 4 can be prevented from being contaminated with the adhesive.

Further, since the cut end face e1 of the right film sheet a and the cut end face e2 of the left film sheet B are separated from the cutter 5 at the same time of cutting, contamination of the cutter 5 by the adhesive can also be suppressed. In addition, at the start of the raising of the cutter 5, the lower ends 61a, 62a of the first and second separating members 61, 62 are in contact with the surfaces of the right and left diaphragms a, B, and the adhesive is less likely to adhere to the cutter 5 as described above, so that the right and/or left diaphragms a, B can be prevented from floating with the raised cutter 5.

Modification example

In the above embodiment, the cutoff device 3 has the first and second separating members 61, 62, but may have only the first separating member 61 as shown in fig. 10. Even when only the first separating member 61 for applying a separating force to the right diaphragm a is provided, the right diaphragm a moves to one side in the width direction while the cutter blade 5 cuts the film material 1, so that the right diaphragm a and the left diaphragm B can be pulled away.

In the case where both the first and second separating members 61 and 62 are provided, as shown in fig. 11, either one of the separating members (for example, the first separating member 61) may be inclined at the above-described inclination angle to extend downward, and the other separating member (for example, the second separating member 62) may extend in the vertical direction with respect to the film material 1.

Further, in the case where both the first and second separating members 61 and 62 are provided, as shown in fig. 12, the lower end of either separating member (for example, the lower end 61a of the first separating member 61) may be formed so as to protrude downward from the cutting edge 5a of the cutting blade 5 at the same level as or more than the cutting edge 5a of the cutting blade 5, and the lower end of the other separating member (for example, the lower end 62a of the second separating member 62) may be formed so as to be positioned above the cutting edge 5a of the cutting blade 5.

Fig. 11 and 12 may be combined, for example, to construct the second separating member 62 such that the second separating member 62 extends in the vertical direction with respect to the film material 1 and the lower end 62a thereof is located above the cutting edge 5a of the cutting blade 5.

In the above embodiment, the first and second separating members 61 and 62 having elastic bodies are illustrated as the means for applying the separating force to the right diaphragm a and the left diaphragm B, but the means for applying the separating force is not limited to the elastic body separating members. For example, the film material 1 may be cut in a state in which the right film sheet a and the left film sheet B are stretched in advance in a direction to separate them from each other.

The specific configuration of the mechanism is not limited to the above embodiment as long as the mechanism can apply a separating force for separating the right diaphragm a from the left diaphragm B to at least one of the right diaphragm a and the left diaphragm B immediately before or simultaneously with cutting the film material 1.

Claims

1. A method for cutting a film material, comprising cutting a film material having a first film, a second film and an adhesive layer provided between the first film and the second film to obtain a right film sheet and a left film sheet as 2 film sheets, wherein,

immediately before or simultaneously with cutting the film material, a separation force for separating the right film sheet from the left film sheet is applied to at least one of the right film sheet and the left film sheet.

2. The method for cutting a film according to claim 1, wherein the cutting of the film is performed by vertically lowering a cutting blade movable up and down with respect to the surface of the film and pressing the cutting blade into the film,

a separating member for applying the separating force to the right diaphragm is provided on one side of the cutter blade in the width direction.

3. The cutoff method of the film material according to claim 2, wherein a lower end of the separation member is in contact with a surface of the right diaphragm immediately before or simultaneously with the cutoff of the film material by the cutoff knife, the separation member causing the separation force to act on the right diaphragm.

4. The method for cutting off a film material according to claim 3, wherein the separation member has an elastic body and protrudes downward obliquely with respect to an axial direction of the cutoff knife.

5. The method for cutting a film according to claim 1, wherein a second separation member for applying the separation force to the left film is provided on a side opposite to the cutting blade in the width direction.

6. The method of sectioning a film according to claim 1, wherein the first film of the film comprises a polarizing film.