JP2020149034A - Method of manufacturing machined laminated film - Google Patents

Abstract

To provide a method of manufacturing a machined laminated film capable of reducing delamination of the laminated film due to machining.SOLUTION: The method of manufacturing a machined laminated film comprises a first machining step of machining a laminated film by performing an operation of relatively moving a machining tool spirally when viewed from a direction perpendicular to the principal plane of the laminated film.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing a machined laminated film.

In recent years, it has been desired to process the shape of a laminated film used in various fields from the purpose of use, designability and the like. However, it is known that when the laminated film is processed, defects such as cracks and delamination occur in the laminated film (Patent Documents 1 and 2).

JP-A-2009-037228 Japanese Unexamined Patent Publication No. 2016-03331

An object of the present invention is to provide a method for producing a machined laminated film, which can suppress delamination of the laminated film due to the cutting process.

The present invention provides a method for producing a machined laminated film shown below.
[1] Laminated laminated film including a first cutting step of cutting the laminated film by performing an operation of relatively moving a cutting tool in a spiral shape when viewed from a direction perpendicular to the main surface of the laminated film. How to make a film.
[2] The cutting tool has a rotatable handle and an outer peripheral blade.
The manufacturing method according to [1], wherein the outer peripheral blade is integrated with the handle.
[3] The manufacturing method according to [2], wherein in the first cutting step, the cutting tool is relatively moved in a state where the handle is perpendicular to the main surface of the laminated film.
[4] The manufacturing method according to any one of [1] to [3], wherein in the first cutting step, the operation of relatively moving the cutting tool is performed in a direction parallel to the main surface of the laminated film. ..
[5] Prior to the first cutting step, a through hole forming step of forming a through hole penetrating in a direction perpendicular to the main surface of the laminated film, and a through hole forming step.
The manufacturing method according to any one of [1] to [4], further comprising an arrangement step of arranging the cutting tool so as to penetrate the through hole.
[6] The manufacturing method according to [5], wherein in the through hole forming step, the through hole is formed by relatively moving the cutting tool in a direction perpendicular to the main surface of the laminated film.
[7] The cutting tool has a rotatable handle, an outer peripheral blade, and a bottom blade.
The manufacturing method according to [6], wherein the outer peripheral blade and the bottom blade are each integrated with the handle.
[8] The production method according to any one of [1] to [7], wherein in the first cutting step, the spiral pitch is 0.01 mm or more and 0.5 mm or less.
[9] The production method according to any one of [1] to [8], further comprising a polishing step of polishing the cut portion formed by the first cutting step.
[10] The laminated film obtained by the first cutting step further includes a second cutting step of further cutting by relatively moving the cutting tool in a direction parallel to the main surface of the laminated film. 1] The production method according to any one of [9].
[11] The production method according to any one of [1] to [10], wherein the laminated film is a film for a display device.
[12] The production method according to any one of [1] to [11], wherein the laminated film contains a polarizing plate.
[13] The manufacturing method according to any one of [1] to [12], wherein a plurality of laminated films are stacked and cut in the first cutting step.

According to the present invention, in the production of a laminated film that has been cut, delamination of the laminated film due to the cutting can be suppressed.

It is the schematic which shows an example of the cut laminated film obtained by the manufacturing method of this invention. The laminated films shown in (a), (b) and (c) are formed with circular, U-shaped and omega-shaped holes, respectively. (A) It is a top view which shows an example of a state in which a cutting tool moves relative to a laminated film in a spiral shape in the 1st cutting step. (B) As a comparative example, it is a top view which shows a mode that a cutting tool moves relative to a laminated film. The line with the arrow in the figure indicates the route of relative movement of the cutting tool when viewed from the direction perpendicular to the main surface of the laminated film. It is a micrograph which took a part of the defect of the laminated film caused by cutting in the prior art from the direction perpendicular to the main surface of the laminated film. The upper left part in the figure is the cut hole part, and the lower right part is the laminated film. It is the schematic sectional drawing which shows an example of the laminated film which concerns on this invention. It is the schematic sectional drawing which shows another example of the laminated film which concerns on this invention. It is a graph which shows the value of the depth of delamination caused by cutting in an Example.

<Cutting laminated film>
The machined laminated film has holes penetrating in a direction perpendicular to the main surface of the laminated film. The hole portion is formed by the above-mentioned cutting process. With reference to FIG. 1, the hole may be, for example, circular ((a) in FIG. 1), oval, square with rounded corners, or the like, and the hole may be U-shaped with the end face bonded (FIG. 1). It may be a notch such as (b)) or an omega shape ((c) in FIG. 1).

When the hole portion is circular, its diameter may be, for example, 1.5 mm or more and 15 mm or less, preferably 2 mm or more and 10 mm or less. When the hole is oval or rounded square, the radius of curvature of the ellipse or rounded corner may be, for example, 1 mm or more and 10 mm or less, preferably 2 mm or more and 10 mm or less. When the hole is a notch, the depth of the notch may be, for example, 1.5 mm or more and 15 mm or less, preferably 2 mm or more and 10 mm or less.

<Laminated film>
The laminated film is one in which two or more layers are laminated. Examples of the layer constituting the laminated film include a polarizer, a protective film, an optical functional layer, an adhesive layer, an adhesive layer, a separate film, a surface protective film (protective film) and the like. Examples of the layer structure of the laminated film are shown in FIGS. 4 and 5, but the laminated film is not limited thereto. In the example of FIG. 4, the laminated film 100 includes a polarizing plate 10, a first pressure-sensitive adhesive layer 20, an optical functional layer 30, an adhesive layer 40, an optical functional layer 31, and a second pressure-sensitive adhesive layer 21. The polarizing plate 10 has a polarizing element 11 and a protective film 12 in this order. As shown in FIG. 5, the polarizing plate 10 may have a polarizing element 11 and protective films 12 and 13 laminated on both surfaces thereof. The laminated film preferably contains a polarizing plate.

[Polarizer]
The polarizing plate 10 is usually composed of a polarizer 11 and a protective film.
The polarizer 11 is an absorption type polarizer having a property of absorbing linearly polarized light having a vibration plane parallel to the absorption axis and transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis). There can be. Examples of the polarizer 11 include a stretched film or a stretched layer on which a dye having an absorption anisotropy is adsorbed, a layer formed by applying a dye having an absorption anisotropy and curing the dye. Examples of the dye having absorption anisotropy include a dichroic dye. As the dichroic dye, specifically, iodine or a dichroic organic dye is used. For dichroic organic dyes, C.I. I. Included are dichroic direct dyes composed of disuazo compounds such as DIRECT RED 39 and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo. The polarizer 11 can be used as the polarizing plate 10 by attaching a protective film to one or both surfaces of the polarizer 11 with an adhesive or an adhesive.

(Polarizer that is a stretched film or stretched layer)
The polarizer 11, which is a stretched film on which a dye having absorption anisotropy is adsorbed, is usually obtained by dyeing the polyvinyl alcohol-based resin film with a bicolor dye in a step of uniaxially stretching the polyvinyl alcohol-based resin film. It can be produced through a step of adsorbing a bicolor dye, a step of treating a polyvinyl alcohol-based resin film on which the bicolor dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution.

The thickness of the polarizer 11 is usually 30 μm or less, preferably 18 μm or less, and more preferably 15 μm or less. Reducing the thickness of the polarizer 11 is advantageous for thinning the polarizing plate 10. The thickness of the polarizer 11 is usually 1 μm or more, and may be, for example, 5 μm or more. The thickness of the polarizer 11 can be controlled, for example, by selecting a polyvinyl alcohol-based resin film, adjusting the draw ratio, or the like.

The polyvinyl alcohol-based resin is obtained by saponifying a polyvinyl acetate-based resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group. Can be mentioned.

The degree of saponification of the polyvinyl alcohol-based resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually 1,000 or more and 10,000 or less, preferably 1,500 or more and 5,000 or less.

The polarizer, which is a stretched layer on which a dye having absorption anisotropy is adsorbed, is usually a step of applying a coating liquid containing the above polyvinyl alcohol-based resin on a base film, and a step of uniaxially stretching the obtained laminated film. , A step of dyeing a polyvinyl alcohol-based resin layer of a uniaxially stretched laminated film with a dichroic dye to adsorb the dichroic dye to form a polarizer, and a film on which the dichroic dye is adsorbed is formed. It can be produced through a step of treating with an aqueous acid solution and a step of washing with water after treatment with an aqueous boric acid solution.
If necessary, the base film may be peeled off from the polarizer. The material and thickness of the base film may be the same as the material and thickness of the protective film described later.

Examples of the protective film 12 include a thermoplastic resin film.
Examples of the thermoplastic resin film include a cyclic polyolefin resin film; a cellulose acetate resin film made of a resin such as triacetyl cellulose and diacetyl cellulose; a polyester resin film made of a resin such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate. ; Polycarbonate-based resin film; (meth) acrylic-based resin film; polypropylene-based resin film and the like, which are known in the art.

The thickness of the protective film 12 is preferably thin from the viewpoint of thinning the polarizing plate, but if it is too thin, the strength tends to decrease and the workability tends to be inferior. Therefore, the thickness is preferably 5 μm or more and 150 μm or less, more preferably 5 μm. It is 100 μm or less, more preferably 10 μm or more and 50 μm or less.

The protective film 12 can also be a protective film having optical functions such as a retardation film and a brightness improving film. For example, a retardation film to which an arbitrary retardation value is given by stretching a transparent resin film made of the above material (uniaxial stretching, biaxial stretching, etc.) or forming a liquid crystal layer or the like on the film. Can be.
When the laminated film 100 is arranged in the image display device, the laminated film 100 can be attached to the image display device so that the protective film 12 is on the image display device side.

A hard coat layer may be formed on the protective film 12. The hard coat layer may be formed on one surface of the protective film, or may be formed on both surfaces. By providing the hard coat layer, the protective film 12 having improved hardness and scratchability can be obtained. The hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, epoxy resin and the like. The hard coat layer may contain additives to improve strength. Additives are not limited, and examples thereof include inorganic fine particles, organic fine particles, and mixtures thereof. As the protective film 13, the description of the protective film 12 is quoted.

(Polarizer formed by applying and curing a dye having absorption anisotropy)
As the polarizer 11 formed by applying and curing a dye having absorption anisotropy, a composition containing a polymerizable dichroic dye having liquid crystal properties or a composition containing a dichroic dye and a polymerizable liquid crystal is used. Examples thereof include a polarizer containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by applying and curing the substrate film.

In the laminated film, if necessary, the base film may be peeled off from the polarizer. The material and thickness of the base film may be the same as the material and thickness of the protective film described above.

In the laminated film, the above-mentioned protective film may be attached to one side or both sides of the polarizer 11 formed by applying and curing a dye having absorption anisotropy.

The thickness of the polarizer 11 obtained by applying and curing a dye having absorption anisotropy is usually 10 μm or less, preferably 0.5 μm or more and 8 μm or less, and more preferably 1 μm or more and 5 μm or less.

[First adhesive layer]
The first pressure-sensitive adhesive layer 20 is a layer that is interposed between the polarizing plate 10 and the optical functional layer 30 and joins them. The first pressure-sensitive adhesive layer 20 may be composed of a pressure-sensitive adhesive composition containing (meth) acrylic resin, rubber-based resin, urethane-based resin, ester-based resin, silicone-based resin, polyvinyl ether-based resin and the like as main components. it can. Among them, a pressure-sensitive adhesive composition using a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer is preferable. The pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.

Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and the like. A polymer or copolymer containing one or more of the (meth) acrylic acid esters as monomers is preferably used. The base polymer is preferably copolymerized with a polar monomer. Examples of the polar monomer include (meth) acrylate compound, (meth) 2-hydroxypropyl acrylate compound, (meth) hydroxyethyl acrylate compound, (meth) acrylamide compound, and N, N-dimethylaminoethyl (meth) acrylate compound. , A monomer having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, etc., such as a glycidyl (meth) acrylate compound.

The pressure-sensitive adhesive composition may contain only the above-mentioned base polymer, but usually further contains a cross-linking agent. As a cross-linking agent, a divalent or higher valent metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with the carboxyl group; an ester bond is formed with the carboxyl group. Polyepoxy compounds or polyols; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. Of these, polyisocyanate compounds are preferable.

To form the first pressure-sensitive adhesive layer 20, a pressure-sensitive adhesive composition is dissolved or dispersed in an organic solvent such as toluene or ethyl acetate to prepare a pressure-sensitive adhesive liquid, which is directly applied to the target surface of the laminated film for adhesion. It can be carried out by a method of forming an agent layer, a method of forming an adhesive layer in a sheet shape on a separate film subjected to a mold release treatment, and transferring the adhesive layer to a target surface of a polarizing plate.
The thickness of the first pressure-sensitive adhesive layer 20 is determined according to its adhesive strength and the like, but may be, for example, in the range of 1 μm or more and 50 μm or less, preferably 2 μm or more and 40 μm or less, more preferably 3 μm or more and 30 μm or less, and further. It is preferably 3 μm or more and 25 μm or less.

The laminated film 100 may include the above-mentioned separate film. The separate film can be a film made of a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, or the like. Of these, a polyethylene terephthalate stretched film is preferable.

The first pressure-sensitive adhesive layer 20 is a filler composed of optional components, glass fibers, glass beads, resin beads, metal powder or other inorganic powder; pigments; colorants; antioxidants; ultraviolet absorbers; antistatic agents; etc. Can be included.

Examples of the antistatic agent include ionic compounds, conductive fine particles, conductive polymers, and the like, and ionic compounds are preferably used.
The cation component constituting the ionic compound may be an inorganic cation or an organic cation.
Examples of the organic cation include pyridinium cation, imidazolium cation, ammonium cation, sulfonium cation, phosphonium cation, piperidinium cation, pyrrolidinium cation and the like, and examples of the inorganic cation include lithium ion and potassium ion.
On the other hand, the anion component constituting the ionic compound may be an inorganic anion or an organic anion, but an anion component containing a fluorine atom is preferable because it provides an ionic compound having excellent antistatic performance. Examples of the anion component containing a fluorine atom include hexafluorophosphate anion [(PF ₆ ⁻ )], bis (trifluoromethanesulfonyl) imide anion [(CF ₃ SO ₂ ) ₂ N ⁻ ] anion, and bis (fluorosulfonyl) imide anion [ (FSO ₂ ) ₂ N ⁻ ] anions and the like can be mentioned.

[Optical functional layer]
The optical function layers 30 and 31 may be layers having an optical function other than the polarizer 11 for imparting a desired optical function. A preferred example of an optical functional layer is a retardation layer. Examples of the retardation layer include a layer giving a phase difference of λ / 2, a layer giving a phase difference of λ / 4 (positive A plate), a positive C plate, and the like. The optical functional layer may include an alignment layer and a base material, or may have two or more liquid crystal layers, orientation layers, and a base material, respectively. When the laminated film 100 has a polarizing layer and a film that gives a phase difference of λ / 4, the laminated film 100 may be a circular polarizing plate.
The protective film 12 can also serve as a retardation layer, but a retardation layer can be laminated separately from these films. In the latter case, the retardation layer can be laminated on the polarizing plate 10 via an adhesive layer or an adhesive layer.

Examples of the retardation layer include a birefringent film composed of a stretched film of a translucent thermoplastic resin, the above-mentioned liquid crystal layer formed on a base film, and the like.
The base film is usually a film made of a thermoplastic resin, and an example of the thermoplastic resin is a cellulosic ester resin such as triacetyl cellulose.

Examples of other optical functional films (optical members) that can be included in the laminated film 100 include a condenser plate, a brightness improving film, a reflective layer (reflective film), a semitransmissive reflective layer (semi-transmissive reflective film), and a light diffusing layer (a light diffusing layer). Light diffusion film) and the like.

[Adhesive layer]
The optical functional layer 30 and the optical functional layer 31 can be bonded via an adhesive layer or an adhesive layer 40. The adhesive layer 40 contains a known water-based composition (including a water-based adhesive) in which a curable resin component is dissolved or dispersed in water, and a known active energy ray-curable composition containing an active energy ray-curable compound. It is composed of materials (including active energy ray-curable adhesive) and the like.

Examples of the resin component contained in the aqueous composition include polyvinyl alcohol-based resin and urethane resin.
The aqueous composition containing a polyvinyl alcohol-based resin is a curable component such as a polyhydric aldehyde, a melamine-based compound, a zirconia compound, a zinc compound, glyoxal, a glyoxal derivative, and a water-soluble epoxy resin in order to improve adhesion and adhesiveness. And a cross-linking agent can be further contained.
Examples of the aqueous composition containing a urethane resin include an aqueous composition containing a polyester ionomer type urethane resin and a compound having a glycidyloxy group. The polyester-based ionomer type urethane resin is a urethane resin having a polyester skeleton, in which a small amount of an ionic component (hydrophilic component) is introduced.

The active energy ray-curable composition is a composition that is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays.

The active energy ray-curable composition can be a composition containing an epoxy compound that is cured by cationic polymerization as a curable component, and preferably an ultraviolet curable composition containing such an epoxy compound as a curable component. It is a thing. The epoxy-based compound means a compound having an average of 1 or more, preferably 2 or more epoxy groups in the molecule. Only one type of epoxy compound may be used, or two or more types may be used in combination.

As the epoxy compound, a hydride epoxy compound (having an alicyclic ring) obtained by reacting an alicyclic polyol obtained by hydrogenating the aromatic ring of an aromatic polyol with epichlorohydrin. Polyglycidyl ether of polyol); an aliphatic epoxy compound such as an aliphatic polyhydric alcohol or a polyglycidyl ether of an alkylene oxide adduct thereof; an epoxy compound having one or more epoxy groups bonded to an alicyclic ring in the molecule. Examples thereof include certain alicyclic epoxy compounds.

The active energy ray-curable composition may contain, as a curable component, a (meth) acrylic compound which is radically polymerizable in place of or together with the epoxy compound. The (meth) acrylic compound is a (meth) acrylate monomer having one or more (meth) acryloyloxy groups in the molecule; obtained by reacting two or more kinds of functional group-containing compounds, and at least two in the molecule. Examples thereof include (meth) acryloyloxy group-containing compounds such as (meth) acrylate oligomers having a (meth) acryloyloxy group.

When the active energy ray-curable composition contains an epoxy-based compound that is cured by cationic polymerization as a curable component, it preferably contains a photocationic polymerization initiator. Examples of the photocationic polymerization initiator include aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic sulfonium salts; and iron-allene complexes.
When the active energy ray-curable composition contains a radically polymerizable component such as a (meth) acrylic compound, it preferably contains a photoradical polymerization initiator. Examples of the photoradical polymerization initiator include an acetophenone-based initiator, a benzophenone-based initiator, a benzoin ether-based initiator, a thioxanthone-based initiator, xanthone, fluorenone, camphorquinone, benzaldehyde, and anthraquinone.

The optical functional layer 30 and the optical functional layer 31 may be joined via an adhesive layer. As the pressure-sensitive adhesive layer used here, the description of the first pressure-sensitive adhesive layer can be cited.

[Second adhesive layer]
The laminated film 100 has a second pressure-sensitive adhesive layer 21 on the optical functional layer 31 side. The second pressure-sensitive adhesive layer 21 can bond the laminated film 100 to an image display element or another optical member.

As the pressure-sensitive adhesive, the pressure-sensitive adhesive composition, the thickness, and the manufacturing method used for the second pressure-sensitive adhesive layer 21, the description described in the section of the first pressure-sensitive adhesive layer 20 is cited. The description of the first pressure-sensitive adhesive layer 20 is also cited for the separate film used for the second pressure-sensitive adhesive layer 21 and any components that may be contained.

[Surface protection film (protection film)]
The laminated film 100 can include a surface protective film for protecting the surface thereof (typically, the surface of the protective film of the polarizing plate). The surface protective film is peeled off together with the pressure-sensitive adhesive layer that the polarizing plate is attached to, for example, an image display element or another optical member.

The surface protective film is composed of, for example, a base film and an adhesive layer laminated on the base film. The above description is cited for the pressure-sensitive adhesive layer.
The resin constituting the base film can be, for example, a polyethylene resin such as polyethylene; a polypropylene resin such as polypropylene; a polyester resin such as polyethylene terephthalate or polyethylene naphthalate; a polycarbonate resin; a thermoplastic resin. .. A polyester resin such as polyethylene terephthalate is preferable.

The thickness of the surface protective film is not particularly limited, but is preferably in the range of 20 μm or more and 200 μm or less. When the thickness of the base material is 20 μm or more, strength tends to be easily imparted to the laminated film 100.

<Manufacturing method of machined laminated film>
In the method for manufacturing a machined laminated film according to the present invention (hereinafter, also referred to as the manufacturing method of the present invention), the cutting tool is relatively moved in a spiral shape when viewed from a direction perpendicular to the main surface of the laminated film. The first cutting step of cutting the laminated film by performing the operation is included. The main surface of the laminated film means a surface perpendicular to the thickness direction of the laminated film.

[Cutting tools]
The cutting tool used in the manufacturing method of the present invention is not particularly limited as long as it can cut the laminated film, but has, for example, a rotatable handle and an outer peripheral blade, and the outer peripheral blade is integrated with the handle. Cutting tools can be mentioned. A cutting tool having a rotatable handle, an outer peripheral blade, and a bottom blade, and the outer peripheral blade and the bottom blade are integrated with the handle may be used. The outer peripheral blade and the bottom blade may be integrated. Examples of such a cutting tool include an end mill and the like.

The number of outer peripheral blades and bottom blades of the cutting tool is not particularly limited, but is, for example, 1 or more and 6 or less, and may be 2, 3, or 4. When the number of blades is small, shavings tend to be discharged easily, but the rigidity of the cutting tool tends to decrease.

The rake angles of the outer peripheral blade and the bottom blade of the cutting tool are usually 0 ° or more and less than 20 °, and may be 3 ° or more and less than 15 °. If the rake angle is too large, the blade tends to be chipped.

The clearance angles of the outer peripheral blade and the bottom blade of the cutting tool are, for example, greater than 0 ° and less than 20 °, and may be 3 ° or more and 15 ° or less. If the clearance angle is 0 °, the laminated film and the blade rub against each other, and if the clearance angle is too large, the blade tends to be chipped.

The outer peripheral blade may be twisted along the handle. The twist angle of the outer peripheral blade of the cutting tool may be −75 ° or more and 75 ° or less, or −65 ° or more and 65 ° or less. If the twist angle is too large, it tends to be difficult to discharge shavings.

The outer peripheral blade of the cutting tool preferably constitutes the maximum diameter of the rotating portion of the cutting tool. The diameter of the outer peripheral blade of the cutting tool (maximum diameter in the direction orthogonal to the handle) is, for example, 1.0 mm or more and 10 mm or less, preferably 1.5 mm or more and 8 mm or less. If the diameter is too small, the end mill tends to break easily, and if it is too large, fine cutting becomes difficult.

The feed rate of the cutting tool is usually 50 mm / min or more and 5000 mm / min or less, may be 100 mm / min or more, and is preferably 200 mm / min or more and 3000 mm / min or less.

Further, the rotation speeds of the outer peripheral blade and the bottom blade of the end mill may be 5000 rpm or more and 100,000 rpm or less, 10,000 rpm or more and 80,000 rpm or less, or 30,000 rpm or more and 60,000 rpm or less. If the rotation speed is slow, delamination of the laminated film tends to occur easily, and if the rotation speed is too fast, heat may be generated and the laminated film may be damaged.

[First cutting process]
In the first cutting step, for example, as shown in FIG. 2A, the laminated film is formed by performing an operation of relatively moving the cutting tool in a spiral shape when viewed from a direction perpendicular to the main surface of the laminated film. To cut.

A swirl is a curve that swirls away from the outside. Spirals include, for example, spirals with equal intervals, that is, spirals with equal pitches (Archimedean spirals, etc.), spirals with spiral pitches increasing outward (logarithmic spirals, etc.), and spiral pitches with outward pitches. Examples include spirals that become narrower (parabolic spirals, etc.). The spirals in which the pitches of the spirals are evenly spaced may be spirals in which the radius increases at regular intervals (for example, half circumference, 1/4 circumference, etc.) of one round or less. In a part of the circumference of the spiral, the pitch of the spiral may be zero, that is, there may be a portion that has already been cut and is not newly cut. The operation of relatively moving the cutting tool in a spiral shape is an operation of allowing the cutting tool to move relative to the outside by the pitch width of the spiral in at least a part of the already cut cutting portion. As a result, the outer laminated film is cut by the pitch width of the spiral in at least a part of the already cut portion.

The spiral in the first cutting step may be one circumference or more, and preferably at least the outermost circumference when cutting the laminated film is cut by a spiral relative movement.

According to the present invention, when the laminated film is cut by performing an operation of relatively moving the cutting tool in a spiral shape when viewed from a direction perpendicular to the main surface of the laminated film, the cutting is performed by the relative movement by a combination of a straight line and a circular motion. Compared with ((B) in FIG. 2 and the like), delamination of the laminated film can be suppressed. For example, when the laminated film has a retardation film and an adhesive layer or an adhesive layer, delamination between the retardation film and the adhesive layer or the pressure-sensitive adhesive layer can be suppressed. Further, when cutting is performed by moving the cutting portion in a spiral shape, the time required to form a cutting portion having a desired size can be shortened.

Conventionally, when a laminated film is cut, delamination as shown in FIG. 3 is likely to occur, and defects such as gluing and cracks are likely to occur. Here, gluing refers to a state in which the adhesive layer in the laminated film is lacking in the portion close to the cutting surface. The crack refers to a crack that occurs in the layer of the laminated film, and tends to occur in the polarizing plate or the optical functional layer. The types of defects such as delamination, gluing, and cracks and the layers in which the defects occur can be identified by observation under an optical microscope.

The cutting portion formed by the first cutting step has a curved portion. When cutting a laminated film in a circle, for example, after moving the cutting tool in a spiral shape while increasing the radius from the center, the cutting tool keeps the maximum radius without changing the radius until it touches the already cut part. When is moved relative to each other, the cut portion becomes circular. For example, when the cutting tool moves relative to each other in a spiral shape so as to draw a circle whose radius increases every half circumference, if the cutting tool moves relative to draw a circle without changing the radius in the last half circumference, the laminated film will be circular. Can form a cutting part of.

When the locus of the cutting tool moving relative to each other in a spiral shape touches the end face of the laminated film, the cutting portion can be a notch portion having a U-shape, an omega shape, or the like. The pitch of the spiral may have a wide portion and a narrow portion in one round, and by repeating such a process, the cut portion may have a shape other than a circle (for example, an ellipse).

In the first cutting step, the laminated film is preferably cut by the outer peripheral blade of the cutting tool coming into contact with the laminated film. When the cutting tool has a rotatable handle, the rotatable handle may be perpendicular to or tilted with respect to the main surface of the laminated film, but is preferably relative to the main surface of the laminated film. Operate the relative movement of the cutting tool in a vertical state. As a result, the cut surface becomes perpendicular to the main surface of the laminated film.

In the first cutting step, the operation of moving the cutting tool relative to each other is usually performed in a direction parallel to the main surface of the laminated film. The operation may further involve movement perpendicular to the main surface of the laminated film. When the movement is perpendicular to the main surface of the laminated film, for example, the operation of moving the cutting tool relative to the spiral shape can be mentioned. The cutting performed by moving the cutting tool relative to each other in a spiral shape may also form a through hole described later.

In the first cutting step, the spiral pitch is, for example, 0.01 mm or more and 0.5 mm or less, preferably 0.02 mm or more and 0.3 mm or less, and more preferably 0.03 mm or more and 0.2 mm or less. When the spiral pitch is within the above range, the laminated film can be cut to a desired size without undue time. If the spiral pitch is too large, defects tend to occur in the cut laminated film.

In the first cutting step, the laminated film may be cut one by one, or may be cut by forming a laminated body in which a plurality of laminated films are laminated. In the first cutting step, when a plurality of laminated films are stacked and cut, the laminated body is formed by performing an operation of relatively moving the cutting tool in a spiral shape when viewed from a direction perpendicular to the main surface of the laminated body. Each laminated film can be cut. The number of laminated films constituting the laminated body may be, for example, 10 or more and 500 or less. The thickness of the laminated body may be, for example, 1 mm or more and 50 mm or less in the laminating direction of the laminated film.

[Through hole forming process]
The production method of the present invention preferably further includes a through hole forming step of forming a through hole penetrating in a direction perpendicular to the main surface of the laminated film. The through hole forming step and the following arrangement step are usually performed before the first cutting step. The size of the through hole is equal to or larger than the maximum diameter orthogonal to the handle of the cutting tool so that the cutting tool can be placed in the through hole.

The through holes are preferably formed by moving the cutting tool relative to the main surface of the laminated film. For example, when a cutting tool has a rotatable handle and a bottom blade integrated with it, the laminated film is cut by the bottom blade by moving the cutting tool relative to the main surface of the laminated film in a direction perpendicular to the main surface. A through hole having the same diameter as the maximum diameter perpendicular to the handle of the cutting tool can be formed. In the through-hole forming step, the operation of moving the cutting tool relative to the main surface of the laminated film may be performed at the same time as or independently of the relative movement of the cutting tool in the direction perpendicular to the main surface of the laminated film. By this operation, a through hole larger than the maximum diameter orthogonal to the handle of the cutting tool can be formed. Examples of the operation of relatively moving the laminated film in a direction parallel to the main surface include an operation in which the cutting tool makes a circular motion and an operation in which the cutting tool moves linearly when viewed from a direction perpendicular to the main surface of the laminated film.

A plurality of laminated films may be laminated to form a laminated body, and a through hole forming step may be performed. In the through-hole forming step, a through-hole can be formed in each laminated film constituting the laminated body by moving the cutting tool relative to the main surface of the laminated body. When the through-hole forming step is performed using the laminated film as a laminated body, the subsequent arrangement step and the first cutting step can be performed on the laminated body in which the through-hole is formed.

The through hole can also be formed by a known method such as a punching method or a laser method. The through hole formed by the above method is preferably larger than the maximum diameter orthogonal to the handle of the cutting tool.

[Placement process]
The manufacturing method of the present invention preferably further includes an arrangement step of arranging the cutting tool so as to penetrate the through hole. It may be arranged so as to penetrate the through hole and the outer peripheral blade of the cutting tool is in contact with the inside of the through hole. Specifically, after forming the through hole, the cutting tool may be arranged so as to penetrate the through hole. When forming a U-shaped or omega-shaped notch, the cutting tool is relatively moved while cutting the laminated film in the direction parallel to the main surface of the laminated film, and the cutting tool is placed at the start point of the spiral. You may.

When a through hole is formed by a cutting tool, the cutting tool can be arranged so as to penetrate the through hole by not pulling out the cutting tool that has been moved relative to the main surface of the laminated film. .. After forming a through hole by moving the cutting tool relative to the main surface of the laminated film, pull out the cutting tool vertically from the through hole to remove polishing debris, and place the cutting tool in the through hole again. You may.

A plurality of laminated films may be laminated to form a laminated body, and an arrangement step may be performed. At this time, the cutting tool is arranged so as to penetrate the through holes formed in each laminated film constituting the laminated body. When the arrangement step is performed on the laminated body, the first cutting step can be performed on the laminated body as it is.

[Polishing process]
The manufacturing method of the present invention preferably further includes a polishing step of polishing the cut portion formed by the first cutting step or the second cutting step described below.

A plurality of laminated films may be laminated to form a laminated body, and a polishing step may be performed. By polishing the laminate in the polishing step, the cut portion of each laminated film constituting the laminate can be polished. After performing the first cutting step or the second cutting step on the laminated body, the laminated body can be polished as it is.

The method of polishing is not particularly limited as long as it can smooth the cut surface, but a polishing method of rubbing with abrasive paper (sandpaper), a polishing cloth, a fine particle polishing agent, a grindstone, etc., an electric polishing method, or a solvent is used. Examples include the chemical polishing method used. A cutting tool such as an end mill used in the first cutting step may be used to polish the cutting surface by reducing the feed rate, reducing the amount of polishing, or both. Further, by polishing, dirt, dust and the like attached in the previous steps can be removed.

[Second cutting process]
The manufacturing method of the present invention may further include a second cutting step in which the laminated film obtained by the first cutting step is further cut by moving the cutting tool relative to the main surface of the laminated film. Good.

A second cutting step may be performed by stacking a plurality of laminated films to form a laminated body. In the second cutting step, each laminated film constituting the laminated body is further cut by performing an operation of relatively moving the cutting tool in a direction parallel to the main surface of the laminated body. The first cutting step may be performed on the laminated body, and the second cutting step may be performed on the laminated body as it is.

A laminated film cut into a desired shape can be obtained by continuously performing the second cutting step from the cut portion formed by the first cutting step. For example, when a circular hole is formed in the first cutting step, a U-shaped or omega-shaped notch is formed by cutting a curved line or a straight line from the hole toward the end face of the laminated film. can do.

<Use of machined laminated film>
The machined laminated film obtained by the production method of the present invention can be used in various display devices. The display device is a device having a display element, and includes a light emitting element or a light emitting device as a light emitting source. Examples of the display device include a liquid crystal display device, an organic EL display device, an inorganic electroluminescence (hereinafter, also referred to as inorganic EL) display device, an electron emission display device (for example, an electric field emission display device (also referred to as FED), and a surface electric field emission display device). (SED)), electronic paper (display device using electronic ink or electrophoretic element), plasma display device, projection type display device (for example, grating light valve (also called GLV) display device, digital micromirror device (DMD) Display devices) having (also referred to as), piezoelectric ceramic displays, and the like. The liquid crystal display device includes any of a transmissive liquid crystal display device, a semi-transmissive liquid crystal display device, and the like. These display devices may be display devices that display two-dimensional images, or may be stereoscopic display devices that display three-dimensional images.

A front plate, a touch sensor panel, a back plate, and the like can be further provided on the machined laminated film to be applied to a display device.

[Front plate]
The front plate is preferably a plate-like body capable of transmitting light. The front plate may be composed of only one layer, or may be composed of two or more layers.
Examples of the front plate include a glass plate (glass plate, flexible thin-walled glass, etc.), a resin plate (resin plate, resin sheet, resin film (sometimes referred to as a window film), etc.). ), And it is preferable that the plate-like body exhibits flexibility. Among the above, a plate-like body made of resin such as a resin film is preferable. Flexibility means that it can be repeatedly bent or bent.

Examples of the resin plate-like body include a resin film made of a thermoplastic resin. As the thermoplastic resin, a polyolefin resin such as a chain polyolefin resin (polyethylene resin, polypropylene resin, polymethylpentene resin, etc.), a cyclic polyolefin resin (norbornen resin, etc.); cellulose such as triacetyl cellulose Based resin; Polyester based resin such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate; Polycarbonate resin; Ethylene-vinyl acetate resin; Polystyrene resin; Polyamide resin; Polyetherimide resin; Polymethyl (meth) acrylate resin Etc. (Meta) acrylic resin; polyimide resin; polyether sulfone resin; polysulfone resin; polyvinyl chloride resin; polyvinylidene chloride resin; polyvinyl alcohol resin; polyvinyl acetal resin; polyether ketone resin ; Polyether ether ketone resin; polyether sulfone resin; polyamideimide resin and the like.
The thermoplastic resin can be used alone or in combination of two or more.
Among them, a polyimide resin, a polyamide resin, and a polyamide-imide resin are preferably used as the thermoplastic resin constituting the front plate from the viewpoint of flexibility, strength, and transparency.

The front plate may be a film having a hard coat layer provided on at least one surface of the base film to further improve the hardness. As the base film, the above-mentioned resin film can be used.

The hard coat layer may be formed on one surface of the base film or may be formed on both surfaces. By providing the hard coat layer, hardness and scratchability can be improved. The thickness of the hard coat layer may be, for example, 0.1 μm or more and 30 μm or less, preferably 1 μm or more and 20 μm or less, and more preferably 5 μm or more and 15 μm or less.

The hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include (meth) acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, epoxy resin and the like. The hard coat layer may contain additives to improve strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof.

The front plate may not only have a function of protecting the front surface (screen) of the display device, but may also have a function as a touch sensor, a blue light cut function, a viewing angle adjusting function, and the like.

The thickness of the front plate may be, for example, 20 μm or more and 2000 μm or less, preferably 25 μm or more and 1500 μm or less, more preferably 30 μm or more and 1000 μm or less, still more preferably 40 μm or more and 500 μm or less, particularly preferably 40 μm or more and 200 μm or less, and further preferably. It may be 40 μm or more and 100 μm or less.

[Touch sensor panel]
The touch sensor panel is not limited as long as it is a panel having a sensor (that is, a touch sensor) capable of detecting the touched position. The detection method of the touch sensor is not limited, and touch sensor panels such as a resistive film method, a capacitance coupling method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, and a surface acoustic wave method are exemplified. Since the cost is low, a touch sensor panel of a resistive film type or a capacitive coupling type is preferably used.

As an example of a resistance film type touch sensor, a pair of substrates arranged opposite to each other, an insulating spacer sandwiched between the pair of substrates, and a transparent conductive film provided as a resistance film on the inner front surface of each substrate. Examples thereof include a member composed of a film and a touch position detection circuit. In an image display device provided with a resistance film type touch sensor, when the surface of the front plate is touched, the opposing resistance films are short-circuited and a current flows through the resistance film. The touch position detection circuit detects the change in voltage at this time, and the touched position is detected.

An example of a capacitively coupled touch sensor is a member composed of a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position detection circuit. In an image display device provided with a capacitance coupling type touch sensor, when the surface of the front plate is touched, the transparent electrode is grounded via the capacitance of the human body at the touched point. The touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.

The thickness of the touch sensor panel may be, for example, 5 μm or more and 2000 μm or less, preferably 5 μm or more and 100 μm or less, and more preferably 5 μm or more and 50 μm or less.

The touch sensor panel may be a member in which a touch sensor pattern is formed on a base film. The example of the base film may be the same as the example in the above description of the protective film. The thickness of the touch sensor pattern may be, for example, 1 μm or more and 20 μm or less.
As the laminated film 100 having a touch sensor panel, for example, a laminated film having a base material (preferably a front plate, more preferably a front plate exhibiting flexibility), a touch sensor, and a polarizing layer in this order, or a base material (preferably). Examples thereof include a laminated film having a front plate, more preferably a front plate exhibiting flexibility), a polarizing layer, and a touch sensor in this order.

[Back plate]
As the back plate, for example, a plate-like body capable of transmitting light may be provided. The back plate may be composed of only one layer, or may be composed of two or more layers.
Examples of the back plate include a glass plate-like body (glass plate, glass film, etc.) and a resin plate-like body (for example, a resin plate, a resin sheet, a resin film, etc.), similarly to the front plate.
Among the above, from the viewpoint of the flexibility of the laminated film 100 and the display device including the laminated film 100, it is preferable to show flexibility, and a resin plate-like body showing flexibility is preferable. Examples of the resin plate-like body include a resin film made of a thermoplastic resin. For specific examples of thermoplastic resins, the description of the front plate is cited. The thermoplastic resin is preferably a cellulose-based resin, a (meth) acrylic-based resin, a cyclic polyolefin-based resin, a polyester-based resin, a polycarbonate-based resin, or the like.

The back plate may be a base film to which a polymerizable liquid crystal compound is applied.

When the back plate is a plate-like body capable of transmitting light, the thickness thereof is preferably 15 μm or more and 200 μm or less, more preferably 20 μm or more and 150 μm or less, still more preferably, from the viewpoint of reducing the thickness of the laminated film 100. Is 30 μm or more and 130 μm or less.

The thickness of the laminated film is not particularly limited because it varies depending on the function required for the laminated film, the application of the laminated film, etc., but may be, for example, 25 μm or more and 1000 μm or less, preferably 100 μm or more and 500 μm or less, more preferably. It is 100 μm or more and 300 μm or less.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

(Manufacturing Example 1)
A polyvinyl alcohol film having an average degree of polymerization of about 2400 and a degree of polymerization of 99.9 mol% or more and a thickness of 20 μm was uniaxially stretched about 4 times by a dry method, and further uniaxially stretched in pure water at 40 ° C. for 1 minute while maintaining a tense state. After the immersion, the mixture was immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.1 / 5/100 at 28 ° C. for 60 seconds. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10.5 / 7.5 / 100 at 68 ° C. for 300 seconds. Subsequently, the mixture was washed with pure water at 5 ° C. for 5 seconds and then dried at 70 ° C. for 180 seconds to obtain a polarizer in which iodine was adsorbed and oriented on a uniaxially stretched polyvinyl alcohol film. The thickness of the polarizer was 7 μm.

A thermoplastic resin film made of a cyclic olefin resin having a thickness of 50 μm is applied to one surface of the obtained polarizing element, and the bonded surfaces thereof are subjected to corona treatment, and then a photocurable adhesive (epoxy-based photocurable) is applied. A polarizing plate was obtained by adhering through a sex adhesive).

The same structure as that shown in FIG. 4 is obtained by laminating the following layers on the surface of the polarizing plate of the polarizing plate opposite to the thermoplastic resin film and not having the second pressure-sensitive adhesive layer 21. A laminated film having a thickness of 17 μm was obtained.
First Adhesive Layer 21: Thickness 5 μm
Optical functional layer 30: λ / 2 plate composed of a cured liquid crystal compound layer and an alignment film, thickness 3 μm
Adhesive layer 40: thickness 5 μm
Optical functional layer 31: λ / 4 plate composed of a cured liquid crystal compound layer and an alignment film, thickness 3 μm

(Manufacturing Example 2)
Similar to Production Example 1, the second pressure-sensitive adhesive layer 21 is not provided, except that the thermoplastic resin film is adhered to both sides of the polarizer and the optical functional layer is attached to one of the thermoplastic resin films. A laminated film having the same configuration as that shown in FIG. 5 except for the above was obtained.

<Example 1>
Fifty laminated films were laminated to form a laminated body. For cutting, an end mill having a diameter of 2 mm and two blades was used. First, the end mill was moved in a direction perpendicular to the surface of the laminated body, a through hole was formed by the bottom blade of the end mill, and the end mill was arranged so as to penetrate the through hole (through hole forming step and arrangement step). After that, as shown in FIG. 2A, the end mill is relatively moved so as to form a spiral when viewed from the direction perpendicular to the surface of the laminated body, and the laminated film is cut (first cutting step). , A circular hole having a diameter of 3 mm was formed. At this time, cutting is performed while performing an operation so that the rotatable handle of the end mill is perpendicular to the main surface of the laminated film and the end mill is relatively moved in a direction parallel to the main surface of the laminated film. went. The spiral was set to a circular motion such that the radius was increased by 0.05 mm every half circumference, and the pitch of the spiral was 0.10 mm. The feed rate of the end mill was 500 mm / min and the rotation speed was 50,000 rpm.

<Example 2>
In the first cutting step, the laminated body was cut in the same manner as in Example 1 except that the feed rate of the end mill was 300 mm / min.

<Example 3>
In the first cutting step, the laminated body was cut in the same manner as in Example 1 except that the feed rate of the end mill was 500 mm / min and the rotation speed was 40,000 rpm.

<Example 4>
In the first cutting step, the laminated body was cut in the same manner as in Example 1 except that the feed rate of the end mill was 500 mm / min and the rotation speed was 30,000 rpm.

<Comparative example 1>
The laminated body was cut in the same manner as in Example 1 except that the moving path of the end mill was different from that of Example 1. First, the end mill was moved in a direction perpendicular to the surface of the laminated body, and a through hole was formed by the bottom blade of the end mill. After that, as shown in FIG. 2B, a linear motion of 0.10 mm and a circular motion in which the radius increases by 0.10 mm are repeated, and cutting is performed so that the pitch becomes 0.10 mm, and the diameter is 3 mm. A circular hole was formed.

<Comparative example 2>
Cutting was performed in the same manner as in Comparative Example 1 except that the distance of linear motion was increased by 0.05 mm and the radius of circular motion was increased by 0.05 mm so that the pitch was 0.05 mm.

<Comparative example 3>
Cutting was performed in the same manner as in Comparative Example 1 except that the distance of the linear motion was increased by 0.15 mm and the radius of the circular motion was increased by 0.15 mm so that the pitch was 0.15 mm.

[Measurement of delamination]
The laminated body was divided into about three in the laminating direction to form an upper layer, a middle layer, and a lower layer, respectively, and one sheet was selected from the approximately central portion of each layer, and the cut portion of the cut laminated film was observed under an optical microscope. The maximum value of the delamination amount (length of delamination generated in the main surface direction of the laminated film) of 80 μm or less was evaluated as “A”, 81 μm or more and 150 μm or less was evaluated as “B”, and 151 μm or more was evaluated as “C”. ..

Table 1 shows the results of cutting the laminated film of Production Example 1 by the methods of Examples 1 to 4 and Comparative Examples 1 and 2.

Table 2 shows the results of cutting the laminated film of Production Example 2 by the methods of Example 1 and Comparative Examples 1 and 2.

In both the laminated film of Production Example 1 and the laminated film of Production Example 2, delamination was suppressed in Example 1 as compared with Comparative Example 1 and Comparative Example 2. In Comparative Example 1 and Comparative Example 2, a large amount of delamination was observed especially in the cut portion where the linear motion was performed. According to the production method of the present invention, it was possible to produce a machined laminated film in which delamination was further suppressed. In Example 1, the occurrence of cracks and gluing was suppressed as compared with Comparative Examples 1 and 2.

FIG. 6 shows the maximum value of the delamination amount when the laminated film of Production Example 1 is cut by the methods described in Examples and Comparative Examples 1 to 3. The laminated film was selected from the lower layers of the laminate.

From the results of Comparative Examples 1 to 3, it can be seen that in the cutting method in which the linear motion and the circular motion are repeated, the delamination increases as the pitch increases. The laminated film underneath the laminate is prone to delamination due to cutting. In order to suppress delamination, the pitch can be reduced, but when the pitch is reduced, the time required for cutting becomes longer until a hole having a desired size is formed. According to the manufacturing method of the present invention, delamination can be suppressed even if the pitch is relatively large, so that the cutting time can be shortened.

100 laminated film, 10 polarizing plate, 11 polarizing element, 12, 13 protective film, 20 first adhesive layer, 21 second adhesive layer, 30, 31 optical functional layer, 40 adhesive layer.

Claims (13)

Manufacture of a machined laminated film including a first cutting step of cutting the laminated film by performing an operation of relatively moving a cutting tool in a spiral shape when viewed from a direction perpendicular to the main surface of the laminated film. Method. The cutting tool has a rotatable handle and an outer peripheral blade.
The manufacturing method according to claim 1, wherein the outer peripheral blade is integrated with the handle. The manufacturing method according to claim 2, wherein in the first cutting step, an operation of relatively moving the cutting tool in a state where the handle is perpendicular to the main surface of the laminated film is performed. The manufacturing method according to any one of claims 1 to 3, wherein in the first cutting step, the operation of relatively moving the cutting tool is performed in a direction parallel to the main surface of the laminated film. Prior to the first cutting step, a through hole forming step of forming a through hole penetrating in a direction perpendicular to the main surface of the laminated film, and a through hole forming step.
The manufacturing method according to any one of claims 1 to 4, further comprising an arrangement step of arranging the cutting tool so as to penetrate the through hole. The manufacturing method according to claim 5, wherein in the through hole forming step, the through hole is formed by relatively moving the cutting tool in a direction perpendicular to the main surface of the laminated film. The cutting tool has a rotatable handle, an outer peripheral blade, and a bottom blade.
The manufacturing method according to claim 6, wherein the outer peripheral blade and the bottom blade are each integrated with the handle. The manufacturing method according to any one of claims 1 to 7, wherein in the first cutting step, the spiral pitch is 0.01 mm or more and 0.5 mm or less. The manufacturing method according to any one of claims 1 to 8, further comprising a polishing step of polishing the cut portion formed by the first cutting step. Claims 1 to further include a second cutting step in which the laminated film obtained by the first cutting step further cuts by relatively moving the cutting tool in a direction parallel to the main surface of the laminated film. The production method according to any one of 9. The manufacturing method according to any one of claims 1 to 10, wherein the laminated film is a film for a display device. The production method according to any one of claims 1 to 11, wherein the laminated film includes a polarizing plate. The manufacturing method according to any one of claims 1 to 12, wherein a plurality of laminated films are stacked and cut in the first cutting step.