TW202103970A - Method for producing cutting-processed laminated film - Google Patents

Abstract

This invention provides a method for producing cutting-processed laminated film capable of suppressing delamination of the laminated film due to cutting process.

A method for producing cutting-processed 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 a main surface of the laminated film.

Description

Manufacturing method of machined laminated film

The present invention relates to a method for manufacturing a laminated film processed by cutting.

In recent years, laminated films used in various fields are increasingly expected to be processed in shape according to their purpose of use, design, and the like. However, when processing a laminated film, it is known that defects such as cracks and delamination between layers occur in the laminated film (for example, JP2009-037228 and JP2016-030331).

The object of the present invention is to provide a method for manufacturing a cut-processed laminated film that can suppress delamination of the laminated film due to cutting.

The present invention provides a method for manufacturing a laminated film that has been machined by cutting as shown below.

[1] A method of manufacturing a cut-processed laminated film, comprising: a first cutting step, which is an operation of relatively moving a cutting tool in a helical shape when viewed from a direction perpendicular to the main surface of the laminated film, This cuts the aforementioned laminated film.

[2] The manufacturing method described in [1], wherein the cutting tool has a rotatable shank and a peripheral edge,

The outer peripheral blade is integrated with the shank.

[3] The manufacturing method according to [2], wherein in the first cutting step, the operation of relatively moving the cutting tool is performed in a state where the shank system 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 moving the cutting tool relative to the main surface of the laminated film Performed in parallel directions.

[5] The manufacturing method as described in any one of [1] to [4], further comprising:

The through hole forming step is to form a through hole before the first cutting step, and the through hole penetrates in a direction perpendicular to the main surface of the laminated film; and

The arrangement step is to arrange 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 manufacturing method according to [6], wherein the cutting tool has a rotatable shank, a peripheral edge, and a bottom edge,

The outer peripheral blade and the bottom blade are respectively integrated with the shank.

[8] The manufacturing method according to any one of [1] to [7], wherein in the first cutting step, the pitch of the spiral is 0.01 mm or more and 0.5 mm or less.

[9] The manufacturing method as described in any one of [1] to [8], further including a grinding step of grinding the cut portion formed by the aforementioned first cutting step.

[10] The manufacturing method as described in any one of [1] to [9], further comprising a second cutting step, in which the laminated film obtained by the aforementioned first cutting step has an The main surface is in a parallel direction, so that the cutting tool is relatively moved, and further cutting is performed.

[11] The manufacturing method according to any one of [1] to [10], wherein the laminated film is a film for a display device.

[12] The manufacturing method according to any one of [1] to [11], wherein the laminated film includes a polarizing plate.

[13] The manufacturing method according to any one of [1] to [12], wherein in the first cutting step, a plurality of pieces of the laminated film are stacked and cut.

According to the present invention, it is possible to suppress interlayer peeling of the laminated film due to the cutting process in the production of the laminated film that has undergone cutting processing.

100: Laminated film

10: Polarizing plate

11: Polarizer

12, 13: Protective film

20: The first adhesive layer

21: The second adhesive layer

30, 31: Optical function layer

40: Adhesive layer

Fig. 1 is a schematic diagram showing an example of a cut laminated film obtained by the manufacturing method of the present invention. In the laminated films shown in (a), (b), and (c), a circular, U-shaped, and Omega-shaped cavity are respectively formed.

Fig. 2 is (A) a plan view showing an example of the relative movement of the cutting tool relative to the laminated film in a spiral shape in the first cutting step. (B) A plan view showing how the cutting tool moves relative to the laminated film as a comparative example. The line with arrows in the figure shows the path of the relative movement of the cutting tool when viewed from the direction perpendicular to the main surface of the laminated film.

Fig. 3 is a micrograph of a defect of the laminated film produced by cutting in the prior art, taken from a direction perpendicular to the main surface of the laminated film. The upper left part of the picture is the cut cave part, and the lower right part is the laminated film.

Fig. 4 is a schematic cross-sectional view showing an example of the laminated film of the present invention.

Fig. 5 is a schematic cross-sectional view showing another example of the laminated film of the present invention.

Fig. 6 is a graph showing the depth value of delamination caused by cutting in the embodiment.

<Cutting Laminated Film>

The cut-processed laminated film has a cavity part penetrating in a direction perpendicular to the main surface of the laminated film. The cave is formed by the above-mentioned cutting process. Referring to Figure 1, the cave part can be round (Figure 1(a)), ellipse round, rounded square shape, etc., and the cave part can also be U-shaped combined with the end surface (Figure 1(b)) ) Or Omega (Ω) shape (Figure 1(c)) and other notches.

When the cavity is circular, the diameter may be, for example, 1.5 mm or more and 15 mm or less, and preferably 2 mm or more and 10 mm or less. When the cave is in an elliptical or rounded square shape, the radius of curvature of the elliptical or rounded corner may be, for example, 1 mm or more and 10 mm or less, preferably 2 mm or more. mm or less. When the cave is a notch, the depth of the notch may be, for example, 1.5 mm or more and 15 mm or less, and preferably 2 mm or more and 10 mm or less.

<Laminated Film>

Laminated film has more than 2 layers. Examples of the layer constituting the laminated film include a polarizer, a protective film, an optical function layer, an adhesive layer, an adhesive layer, a spacer film, a surface protective film (shielding film), and the like. The example of the layer structure of the laminated film is shown in FIGS. 4 and 5, but the laminated film is not limited to this. In the example of FIG. 4, the laminated film 100 has a polarizing plate 10, a first adhesive layer 20, an optical function layer 30, an adhesive layer 40, an optical function layer 31, and a second adhesive layer 21 in this order, and the polarizing plate 10 The system has a polarizer 11 and a protective film 12. As shown in FIG. 5, the polarizing plate 10 may have a polarizer 11 and protective films 12 and 13 laminated on both sides thereof. The laminated film preferably includes a polarizing plate.

〔Polarizing plate〕

The polarizer 10 is usually composed of a polarizer 11 and a protective film.

The polarizer 11 may be an absorption type polarizer that absorbs linearly polarized light having a vibration surface parallel to the absorption axis and transmits linearly polarized light having a vibration surface orthogonal to the absorption axis (parallel to the penetration axis). Examples of the polarizer 11 include a stretched film or stretched layer on which a pigment having absorption anisotropy is adsorbed, a layer formed by coating and curing a pigment having an absorption anisotropy, and the like. Examples of pigments having absorption anisotropy include dichroic pigments. Specifically, dichroic dyes can be iodine or dichroic organic dyes. Dichroic organic dyes include dichroic direct dyes composed of C.I.DIRECT RED39 and other bisazo compounds, and dichroic direct dyes composed of compounds such as trisazo and tetrasazo. The polarizer 11 can be used as the polarizer 10 by pasting a protective film on one or both surfaces of the polarizer 11 via an adhesive or adhesive.

(Polarizer belonging to stretched film or stretched layer)

The polarizer 11, which belongs to the stretched film to which the pigment with absorption anisotropy is adsorbed, can usually be manufactured through the following steps: the step of uniaxially stretching the polyvinyl alcohol-based resin film; dyeing the polyvinyl alcohol-based resin film with dichroic pigments , The step of making it adsorb the dichroic pigment; the step of treating the polyvinyl alcohol resin film adsorbing the dichroic pigment with the boric acid aqueous solution; and the step of washing with water after the treatment with the boric acid aqueous 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. Making the thickness of the polarizer 11 thinner is beneficial to the thinning of the polarizer 10. The thickness of the polarizer 11 is usually 1 μm or more, for example, 5 μm or more. The thickness of the polarizer 11 can be controlled by, for example, selection of a polyvinyl alcohol-based resin film, adjustment of a stretching ratio, and the like.

The polyvinyl alcohol-based resin is obtained by saponifying a polyvinyl acetate-based resin. In addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, polyvinyl acetate resins can also be copolymers of vinyl acetate and other monomers copolymerizable therewith. Other monomers that can be copolymerized with vinyl acetate include, for example, unsaturated carboxylic acid-based compounds, olefin-based compounds, vinyl ether-based compounds, unsaturated turpentine-based compounds, and (meth)acrylamide-based compounds having an ammonium group. Compound etc.

The degree of saponification of the polyvinyl alcohol resin is usually 85 mol% or more and 100 mol% or less, preferably 98 mol% or more. The polyvinyl alcohol-based resin can be modified, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can 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.

Polarizers that belong to the extended layer adsorbed with pigments with absorption anisotropy can usually be manufactured through the following steps: the step of coating the coating solution containing the above-mentioned polyvinyl alcohol-based resin on the base film; and the resulting laminate The step of uniaxial stretching of the film; the step of dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminated film with dichroic pigments so that it can adsorb the dichroic pigments and become a polarizer; The step of treating the film with the dichroic pigment with an aqueous solution of boric acid; and the step of washing with water after being treated with the aqueous solution of boric acid.

If necessary, the base film can be peeled and removed 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.

The protective film 12 may be, for example, a thermoplastic resin film.

Examples of thermoplastic resin films include cyclic polyolefin resin films; cellulose acetate resin films composed of resins such as triacetyl cellulose and diacetyl cellulose; polyethylene terephthalate, polyethylene naphthalate Polyester resin films composed of resins such as ethylene glycol and polybutylene terephthalate; polycarbonate resin films; (meth)acrylic resin films; polypropylene resin films, etc., which are well known in the art membrane.

From the viewpoint of thinning of the polarizing plate, the thickness of the protective film 12 is preferably thinner, but if it is too thin, the strength tends to be low and the workability tends to be poor. Therefore, it is preferably 5 μm or more and 150 μm or less, more preferably 5 μm or more and 100 μm. Hereinafter, it is more preferably 10 μm or more and 50 μm or less.

The protective film 12 may be, for example, a protective film having both optical functions such as a retardation film and a brightness enhancement film. For example, it may be a retardation film to which an arbitrary retardation value is given by stretching a transparent resin film composed of the above-mentioned materials (uniaxial stretching, biaxial stretching, etc.), or forming a liquid crystal layer on the film.

When the laminated film 100 is arranged in an image display device, the laminated film 100 can be bonded to the image display device so that the protective film 12 is on the side of the image display device.

A hard coat layer may also be formed on the protective film 12. The hard coat layer can be formed on one side of the protective film or on both sides. By providing a hard coating, it can become a protective film 12 that improves hardness and scratch resistance. The hard coat layer is, for example, a cured layer of ultraviolet curable resin. Examples of ultraviolet curable resins include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. In order to increase the strength, the hard coat layer may also contain additives. The additives are not limited, but inorganic It is fine particles, organic fine particles, or a mixture of these. The protective film 13 refers to the description of the protective film 12.

(Polarizer made by coating and hardening pigment with absorption anisotropy)

The polarizer 11 formed by coating and hardening a pigment with absorption anisotropy can be exemplified by coating a composition containing a polymerizable dichroic pigment with liquid crystallinity on a base film, or containing a dichroic pigment A polarizer containing a cured product of a polymerizable liquid crystal compound, such as a layer obtained by curing a composition with a polymerizable liquid crystal.

In the laminated film, if necessary, the base film can be peeled and removed from the polarizer. The material and thickness of the base film can be the same as the material and thickness of the above-mentioned protective film.

In the laminated film, the polarizer 11 formed by coating and hardening a pigment with absorption anisotropy can also be laminated with the above-mentioned protective film on one or both sides.

The thickness of the polarizer 11 formed by coating and hardening a pigment having absorption anisotropy is generally 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.

〔1st Adhesive Layer〕

The first adhesive layer 20 is a layer that intervenes and exists between the polarizing plate 10 and the optical function layer 30 and joins these layers. The first adhesive layer 20 may be an adhesive composition with (meth)acrylic resin, rubber resin, urethane resin, ester resin, silicone resin, polyvinyl ether resin, etc. as main components. Constituted. Among them, it is suitable as an adhesive composition using a (meth)acrylic resin excellent in transparency, weather resistance, heat resistance, etc., as a matrix polymer. The adhesive composition can be an active energy ray hardening type or a heat hardening type.

For the (meth)acrylic resin (matrix polymer) used in the adhesive composition, butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, (methyl) ) Polymers or copolymers in which one or more of (meth)acrylates such as 2-ethylhexyl acrylate are used as monomers. The matrix polymer preferably copolymerizes polar monomers. Examples of polar monomers include (meth)acrylic acid compounds, 2-hydroxypropyl (meth)acrylate compounds, hydroxyethyl (meth)acrylate compounds, (meth)acrylamide compounds, and (meth)acrylic acid N , N-dimethylamino ethyl compounds, glycidyl (meth)acrylate compounds and other monomers having carboxyl groups, hydroxyl groups, amide groups, amine groups, epoxy groups, etc.

The adhesive composition may only contain the above-mentioned matrix polymer, but usually further contains a crosslinking agent. Examples of crosslinking agents are: metal ions with more than two valences that form carboxylic acid metal salts with carboxyl groups; polyamine compounds that form amide bonds with carboxyl groups; and polyepoxides that form ester bonds with carboxyl groups Compounds or polyols; polyisocyanate compounds that form amide bonds with carboxyl groups. Among them, polyisocyanate compounds are preferred.

The formation of the first adhesive layer 20 can be performed by the following method: the adhesive composition is dissolved or dispersed in an organic solvent such as toluene or ethyl acetate to prepare an adhesive liquid, and the adhesive liquid is directly applied to the build-up layer A method of forming an adhesive layer on the target surface of the film; or a method of first forming a sheet-shaped adhesive layer on the spacer film with a release process and transferring this to the target surface of the polarizing plate.

The thickness of the first adhesive layer 20 is determined in accordance with the adhesive force and the like. For example, it may be 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 still more preferably 3 μm or more and 25 μm or less.

The laminated film 100 may contain the aforementioned spacer film. The spacer film may be a film composed of a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, and a polyester resin such as polyethylene terephthalate. Among them, a stretched film of polyethylene terephthalate is preferred.

The first adhesive layer 20 may include fillers composed of glass fibers, glass beads, resin beads, metal powder or other inorganic powders; pigments; colorants; antioxidants; ultraviolet absorbers; antistatic agents, etc., as optional components.

Examples of the antistatic agent include ionic compounds, conductive fine particles, and conductive polymers, and ionic compounds are preferably used.

The cationic component constituting the ionic compound may be an inorganic cation or an organic cation.

Examples of organic cations include pyridinium cations, imidazolium cations, ammonium cations, sulfonium cations, phosphonium cations, piperidinium cations, and pyrrolidinium cations. Examples of inorganic cations 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 from the viewpoint of providing an ionic compound with excellent antistatic properties, an anion component containing a fluorine atom is preferred. The anionic component containing a fluorine atom include hexafluorophosphate [phosphonate anion (PF ₆ ^-)], bis (trifluoromethane sulfonic acyl) imide anion _{[(CF 3 SO 2) 2 N} - ] anion, bis ( sulfo acyl-fluoro) imide anion [(FSO _{2) 2} N ^-] anion.

〔Optical Function Layer〕

The optical function layers 30 and 31 may be layers having optical functions other than the polarizer 11 for imparting desired optical functions. A suitable example of the optical function 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 function layer may include an alignment layer and a substrate, or may have two or more liquid crystal layers, alignment layers, and substrates each. When the laminated film 100 has a polarizing layer and a film providing a phase difference of λ/4, the laminated film 100 may be a circular polarizing plate.

The protective film 12 may also serve as a retardation layer, but a retardation layer may be laminated in addition to these films. In the latter case, the retardation layer may 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 thermoplastic resin having translucency, 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 cellulose ester resin such as triacetyl cellulose.

Examples of other optically functional films (optical members) that can be contained in the laminated film 100 include a light-collecting plate, a brightness enhancement film, a reflective layer (reflective film), a semi-transmissive reflective layer (semi-transmissive reflective film), and a light diffusion layer. (Light diffusion film) and so on.

〔Adhesive layer〕

The optical function layer 30 and the optical function layer 31 may be joined via an adhesive layer or an adhesive layer 40. Adhesive layer 40 is composed of a known water-based composition (including water-based adhesive) in which a curable resin component is dissolved or dispersed in water and a known active energy ray curable composition (including active energy ray curable compound). Linear hardening adhesive) and so on.

Examples of the resin component contained in the water-based composition include polyvinyl alcohol-based resins, urethane resins, and the like.

In order to improve adhesion or adhesion, the water-based composition containing polyvinyl alcohol-based resin may further contain polyaldehyde, melamine-based compound, zirconium oxide compound, zinc compound, glyoxal, glyoxal derivative, water-soluble epoxy Curable components such as resins or crosslinking agents.

The water-based composition containing the urethane resin includes an aqueous composition containing a polyester-based ionomer type urethane resin and a compound having a glycidyloxy group. Polyester ionomer type urethane resin refers to a urethane resin having a polyester skeleton with a small amount of ionic components (hydrophilic components) introduced.

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

The active energy ray curable composition may be a composition containing an epoxy-based compound that is cured by cationic polymerization as a curable component, and is preferably an ultraviolet-curable composition containing the epoxy-based compound as a curable component. The epoxy-based compound means a compound having one or more epoxy groups, preferably two or more epoxy groups on average in the molecule. The epoxy compound may use only 1 type, and may use 2 or more types together.

Examples of epoxy compounds include alicyclic polyols obtained by hydrogenating the aromatic ring of aromatic polyols, and hydrogenated epoxy compounds obtained by reacting with epichlorohydrin (polybasic polyols having alicyclic rings). Glycidyl ether of alcohol); aliphatic epoxy compounds such as polyglycidyl ether of aliphatic polyhydric alcohol or its alkylene oxide adduct; belonging to one or more alicyclic ring bonds in the molecule The epoxy-based epoxy compounds, alicyclic epoxy compounds, etc.

The active energy ray curable composition may contain a radical polymerizable (meth)acrylic compound as a curable component instead of the epoxy compound; or may contain both the epoxy compound and the radical polymerizable ( A meth)acrylic compound is used as a curable component. The (meth)acrylic compound includes a (meth)acrylate monomer having one or more (meth)acryloxy groups in the molecule; it is obtained by reacting two or more functional group-containing compounds Compounds containing (meth)acryloxy groups such as (meth)acrylate oligomers having at least two (meth)acryloxy groups in the molecule.

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. The photocationic polymerization initiator includes aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic sulfonium salts; iron-allene complexes and the like.

When the active energy ray-curable composition contains a radical polymerizable component such as a (meth)acrylic compound, it preferably contains a photo-radical polymerization initiator. The photo-radical polymerization initiators include acetophenone-based initiators, benzophenone-based initiators, benzoin ether-based initiators, thioxanthone-based initiators, xanthones, and quinones. , Camphorquinone, benzaldehyde, onionquinone, etc.

The optical function layer 30 and the optical function layer 31 may be joined via an adhesive layer. For the adhesive layer used here, the description of the first adhesive layer can be cited.

[Second Adhesive Layer]

The laminated film 100 has the second adhesive layer 21 on the optical function layer 31 side. The second adhesive layer 21 can bond the laminated film 100 to an image display element or other optical members.

The adhesive, adhesive composition, thickness, and production method used in the second adhesive layer 21 refer to the descriptions described in the item of the first adhesive layer 20. The separator used in the second adhesive layer 21 and optional components that may be contained also refer to the description of the first adhesive layer 20.

〔Surface protection film (shielding film)〕

The laminated film 100 may include a surface protective film for protecting the surface thereof (typically, the surface of the protective film of the polarizing plate). The surface protection film is peeled off and removed, for example, after the image display element or other optical member is bonded to the polarizing plate, together with the adhesive layer it has.

The surface protection film is composed of, for example, a base film and an adhesive layer laminated thereon. The adhesive layer refers to the above-mentioned description.

The resin constituting the base film may be, for example, polyethylene resins such as polyethylene; polypropylene resins such as polypropylene; polyester resins such as polyethylene terephthalate or polyethylene naphthalate; and polycarbonate. Department of resin; and other thermoplastic resins. It is preferably a polyester resin such as polyethylene terephthalate.

The thickness of the surface protection film is not particularly limited, but is preferably set to a range of 20 μm or more and 200 μm or less. When the thickness of the base film is 20 μm or more, it tends to be easier to impart strength to the laminated film 100.

<Manufacturing Method of Laminated Film by Cutting Process>

The manufacturing method of the cut-processed laminated film of the present invention (hereinafter, also referred to as the manufacturing method of the present invention) includes a first cutting step, which is viewed from a direction perpendicular to the main surface of the laminated film, and the cutting tool is screwed. The operation of linear relative movement cuts the aforementioned laminated film. The main surface of the laminate film refers to a surface perpendicular to the thickness direction of the laminate film.

〔Cutting Tools〕

The cutting tool used in the manufacturing method of the present invention is not particularly limited as long as it is capable of cutting a laminated film. For example, a cutting tool having a rotatable shank and a peripheral edge, and the peripheral edge and the shank are integrated. It is also possible to use a cutting tool with a rotatable shank, a peripheral edge and a bottom edge, and the peripheral edge and the bottom edge are respectively integrated with the shank. The outer edge and the bottom edge can be integrated. Examples of such cutting tools include end mills and the like.

The number of the peripheral edge and the bottom edge of the cutting tool is not particularly limited, and for example, it may be one or more and six or less, or two, three, or four. When the number of blades is small, there is a tendency to easily discharge the cutting chips, but the rigidity of the cutting tool is likely to decrease.

The rake angle of the peripheral edge and the bottom edge of the cutting tool is usually 0° or more and less than 20°, and may also be 3° or more and less than 15°. When the angle of inclination is too large, the blade tends to become easily chipped.

The clearance angle (clearance angle) of the outer peripheral edge and the bottom edge of the cutting tool is, for example, greater than 0° and less than 20°, and may be 3° or more and 15° or less. When the clearance angle is 0°, the laminated film will rub against the blade, and when the clearance angle is too large, the blade tends to be easily chipped.

The peripheral edge can also be twisted along the shank. The torsion angle of the peripheral edge of the cutting tool may be -75° or more and 75° or less, or -65° or more and 65° or less. When the torsion angle is too large, it tends to be difficult to discharge chips.

The outer peripheral edge of the cutting tool is preferably the largest diameter constituting the rotating part of the cutting tool. The diameter (the maximum diameter in the direction orthogonal to the shank) of the outer peripheral edge of the cutting tool 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. If the diameter is too large, it will be difficult to perform fine cutting.

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

In addition, the rotation speed of the peripheral edge and the bottom edge of the end mill can be from 5000 rpm to 100,000 rpm, from 10,000 rpm to 80,000 rpm, or from 30,000 rpm to 60,000 rpm. When the rotation speed is slow, the interlayer peeling of the laminated film tends to occur easily, and when the rotation speed is too fast, it may generate heat and cause damage to the laminated film.

[The first cutting step]

In the first cutting step, for example, as shown in FIG. 2(A), when viewed from a direction perpendicular to the main surface of the laminated film, an operation of relatively moving the cutting tool in a spiral shape is performed to cut the laminated film.

A spiral refers to a curve that rotates while moving away from the outside. Examples of spirals include: spirals in which the interval of the spirals (that is, the pitch of the spirals) is equally spaced (Archimedes spiral, etc.), and the pitch of the spirals becomes wider toward the outside. A spiral (logarithmic spiral, etc.), a spiral whose pitch becomes narrower toward the outside (parabolic spiral, etc.), etc. A spiral whose pitch is equally spaced may be a spiral whose radius increases at a certain interval (for example, half turn, quarter turn, etc.) below every other turn. A part of the spiral can have a spiral pitch of 0, that is, it has not been cut from the part Recut part. The operation of relatively moving the cutting tool in a helical shape refers to an operation of relatively moving the cutting tool to the outside of only the pitch width of the spiral in at least a part of the cut portion that has been cut. Thereby, in at least a part of the cut portion that has been cut, only the laminated film on the outer side of the pitch width of the spiral is cut.

The spiral in the first cutting step may be one or more turns, and it is preferable that at least the outermost periphery is cut due to spiral relative movement when cutting the laminated film.

According to the present invention, when viewed from a direction perpendicular to the main surface of the laminated film, the operation of relatively moving the cutting tool in a spiral shape to cut the laminated film is different from the relative movement by a combination of linear and circular motions. Compared with the case of cutting (Fig. 2(B), etc.), the interlayer peeling 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, peeling between a retardation film and an adhesive layer or an adhesive layer can be suppressed. Furthermore, if cutting is performed by relative movement in a spiral shape, the time required to form a cut portion of a target size can be shortened.

In the past, when cutting a laminated film, the interlayer peeling as shown in FIG. 3 was easy to occur, and defects such as lack of paste and cracking were easy to occur. Here, the lack of paste refers to a state where the adhesive layer near the cutting surface is lacking in the adhesive layer in the laminated film. Cracks refer to cracks that occur in the layer of the laminated film, and are likely to occur in the polarizing plate or the optical function layer. The types of defects such as delamination, lack of paste, and cracking, and the layer in which the defect occurs can be distinguished by observation under an optical microscope.

The cutting portion formed by the first cutting step has a curved portion. When cutting the laminated film into a circular shape, for example, if the cutting tool is relatively moved spirally while increasing the radius from the center, the radius is not changed until it comes into contact with the cut part, and the maximum radius is maintained for cutting. The relative movement of the tool circularly, the cut part will become circular. For example, if the cutting tool is relatively moved spirally in such a way that the radius of each half circle becomes larger, the last half circle does not change. The cutting tool is relatively moved by drawing a circle with a variable radius, and a circular cutting part can be formed in the laminated film.

When the trajectory of the relative movement of the cutting tool in a spiral shape is in contact with the end surface of the laminated film, the cut portion can be a U-shaped, Omega-shaped cutout. The pitch of the spiral may have a wide part and a narrow part in one turn, and by such repetition, the cut part may be formed into a shape other than a circle (for example, an ellipse circle, etc.).

In the first cutting step, it is preferable to cut the laminated film by contacting the outer peripheral edge of the cutting tool with the laminated film. When the cutting tool has a rotatable shank, the rotatable shank may be vertical or inclined with respect to the main surface of the laminated film. It is preferable to make the cutting tool perpendicular to the main surface of the laminated film. Relative movement operation. Thereby, the cut surface becomes perpendicular to the main surface of the laminated film.

In the first cutting step, the operation of relatively moving the cutting tool is usually performed in a direction parallel to the main surface of the laminated film. This operation may be further accompanied by a vertical movement with respect to the main surface of the laminated film. When the movement is perpendicular to the main surface of the laminated film, for example, an operation of relatively moving the cutting tool in a spiral shape can be mentioned. The cutting performed by relatively moving the cutting tool in a spiral shape may also serve as the formation of the through hole described later.

In the first cutting step, the pitch of the spiral 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 pitch of the spiral is within the above range, the laminated film can be cut to the desired size without excessively requiring time. In addition, when the pitch of the spiral is too large, the cut laminated film tends to be easily defective.

In the first cutting step, the laminated film can be cut one by one, or a laminated body formed by stacking a plurality of laminated films can be cut. In the first cutting step, overlap the laminated film When several pieces are cut together, when viewed from a direction perpendicular to the main surface of the laminated body, an operation of relatively moving the cutting tool in a spiral shape is performed, whereby each laminated film constituting the laminated body can be cut. The number of laminate films constituting the laminate may be, for example, 10 or more and 500 or less. In the lamination direction of the lamination film, the thickness of the lamination body may be, for example, 1 mm or more and 50 mm or less.

[Through hole formation step]

The manufacturing 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. In order to be able to arrange the cutting tool in the through hole, the size of the through hole is the same as or larger than the maximum diameter of the cutting tool orthogonal to the shank.

The through hole is preferably formed by relatively moving the cutting tool in a direction perpendicular to the main surface of the laminated film. For example, when a cutting tool has a rotatable shank and a bottom edge integrated with the shank, by moving the cutting tool in a vertical direction toward the main surface of the laminated film, the laminated film can be cut with the bottom edge to form a A through hole with the same diameter orthogonal to the largest diameter of the shank of a cutting tool. In the through hole forming step, the relative movement of the cutting tool in a direction parallel to the main surface of the laminated film can be performed simultaneously or independently of the relative movement in the direction perpendicular to the main surface of the laminated film. By this operation, a through hole larger than the maximum diameter of the cutting tool orthogonal to the shank can be formed. The operation of relative movement in a direction parallel to the main surface of the laminated film may include circular motion operations or linear motion operations of the cutting tool when viewed from the direction perpendicular to the main surface of the laminated film.

It is also possible to stack a plurality of laminated films to form a laminated body, and perform the through hole forming step. In the through hole forming step, by relatively moving the cutting tool in a direction perpendicular to the main surface of the laminated body, a through hole can be formed in each laminated film constituting the laminated body. The laminated film is made into a laminated body and In the case of performing the through-hole forming step, the subsequent arranging step and the first cutting step may be performed on the laminated body in which the through-hole is formed.

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

[Configuration steps]

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 can also be arranged in such a way that the through hole penetrates and the outer peripheral edge of the cutting tool contacts the inside of the through hole. Specifically, after the through hole is formed, the cutting tool may be arranged so as to penetrate the through hole. When a U-shaped or Omega-shaped notch is formed, the cutting tool can be relatively moved while cutting the laminated film in a direction parallel to the main surface of the laminated film, and the cutting tool can be placed at the starting point of the spiral.

When the through hole is formed by the cutting tool, the cutting tool can be arranged so as to penetrate the through hole without pulling out the cutting tool that has relatively moved in a direction perpendicular to the main surface of the laminated film. After the cutting tool is relatively moved in a direction perpendicular to the main surface of the laminated film to form a through hole, the cutting tool may be pulled out in the vertical direction from the through hole to remove the grinding slag, and the cutting tool may be placed in the through hole again.

It is also possible to stack a plurality of laminated films to form a laminated body and perform the arrangement step. At this time, the cutting tool is arranged so as to penetrate through the through holes formed in the respective laminated films constituting the laminated body. When performing the arrangement step on the layered body, the first cutting step can be directly performed on the layered body.

〔Grinding Step〕

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.

It is also possible to stack a plurality of laminated films to form a laminated body and perform a polishing step. In the polishing step, by polishing the laminated body, the cut portions of each laminated film constituting the laminated body can be polished. After the layered body is subjected to the first cutting step or the second cutting step, the layered body can be directly polished.

The method of polishing is not particularly limited as long as it is a method that can smooth the cut surface. Examples include polishing methods such as abrasive paper (sandpaper), abrasive cloth, fine particle abrasives, and grindstones, electric abrasive methods, and use Chemical polishing of solvents, etc. It is also possible to grind the cutting surface by using a cutting tool such as an end mill used in the first cutting step and slowing down the feed rate, reducing the amount of grinding, or both. In addition, the dirt, dust, etc. attached to the steps up to this point can also be removed by grinding.

[Second cutting step]

The manufacturing method of the present invention may further include a second cutting step in which, in the laminated film obtained from the first cutting step, the cutting tool is relatively moved in a direction parallel to the main surface of the laminated film to further perform cutting.

It is also possible to stack a plurality of laminated films to form a laminated body, and perform the second cutting step. In the second cutting step, by performing an operation of relatively moving the cutting tool in a direction parallel to the main surface of the laminated body, each laminated film constituting the laminated body is further cut. It is also possible to perform the first cutting step on the layered body and directly perform the second cutting step on the layered body.

By proceeding to the second cutting step from the cut portion formed in the first cutting step, a laminated film of the desired shape after cutting can be obtained. For example, when a circular cavity is formed in the first cutting step, a U-shaped, Omega, etc. notch can be formed by cutting a curve or a straight line from the cavity to the end surface of the laminated film.

<Uses of Laminated Films Processed by Cutting>

The machined laminated film obtained by the manufacturing method of the present invention can be used in various display devices. The display device refers to a device with a display element and contains a light-emitting element or a light-emitting device as a light-emitting source. The display device can include, for example, 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 (such as a field emission display device (also referred to as FED), a surface electric field emission display) Device (also known as SED), electronic paper (display device using electronic printing ink or electrophoresis element), plasma display device, projection display device (such as grating light valve (also called GLV) display device, with digital Micromirror devices (also known as DMD display devices) and piezoelectric ceramic displays, etc. The liquid crystal display device also includes any one 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 2-dimensional images, or may be stereoscopic display devices that display 3-dimensional images.

The above-mentioned machined laminated film can be further provided with a front panel, a touch sensor panel, a back panel, etc., and applied to a display device.

〔Front Panel〕

The front panel is preferably a light-permeable plate-shaped body. The front panel may be composed of only one layer, or may be composed of two or more layers.

Examples of the front panel include glass plates (glass plates, flexible thin glass, etc.), resin plates (resin plates, resin sheets, resin films (also called window films), etc.), It is preferably a plate-shaped body exhibiting flexibility. Among the above, a plate-shaped body made of resin such as a resin film is preferred. Flexibility refers to those that can bend or bend repeatedly.

Examples of the resin-made plate-shaped body include a resin film composed of a thermoplastic resin. Thermoplastic resins include polyolefin resins such as chain polyolefin resins (polyethylene resins, polypropylene resins, polymethylpentene resins, etc.), cyclic polyolefin resins (norbornene resins, etc.) Resin; Triacetyl cellulose and other fibers Vitamin resins; polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polycarbonate resins; ethylene-vinyl acetate resins; Polystyrene resins; polyamide resins; polyether imine resins; (meth)acrylic resins such as polymethyl (meth)acrylate resin; polyimide resins; polyether imide resins ；Polyether resins; polyvinyl chloride resins; polyvinylidene chloride resins; polyvinyl alcohol resins; polyvinyl acetal resins; polyether ketone resins; polyether ether ketone resins; polyethers Chloride-based resins; polyimide-based resins, etc.

The thermoplastic resin can be used alone or in combination of two or more kinds.

Among them, from the viewpoint of flexibility, strength, and transparency, the thermoplastic resin constituting the front panel is preferably polyimide resin, polyimide resin, and polyimide resin.

The front panel may be a film with a hard coat layer provided on at least one surface of the base film to increase the hardness. The above-mentioned resin film can be used for the base film.

The hard coat layer may be formed on one side of the base film or on both sides. By installing a hard coat, the hardness and scratch resistance 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 may be, for example, a cured layer of ultraviolet curable resin. Examples of ultraviolet curable resins include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, epoxy resins, and the like. In order to increase the strength, the hard coat layer may also contain additives. The additives are not limited, and examples include inorganic fine particles, organic fine particles, and mixtures thereof.

The front panel not only has the function of protecting the front face (screen) of the display device, but also has the function of being a touch sensor, anti-blue light function, viewing angle adjustment function, etc.

The thickness of the front panel can 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, and still more preferably 40 μm or less. The upper limit is 500 μm or less, particularly preferably 40 μm or more and 200 μm or less, and more preferably 40 μm or more and 100 μm or less.

〔Touch sensor panel〕

If the touch sensor panel is a panel with a sensor (that is, a touch sensor) that can detect the touched position, it is not limited. The detection method of the touch sensor is not limited, and examples of touch sensor panels such as resistive film type, capacitive coupling type, photo sensor type, ultrasonic type, electromagnetic induction coupling type, surface elastic wave type, and the like are exemplified. In terms of low cost, it is suitable to use resistive film type and capacitive coupling type touch sensor panels.

As an example of a resistive film type touch sensor, a pair of substrates arranged to face each other, an insulating spacer sandwiched between the pair of substrates, are provided on the entire inner surface of each substrate It is a component composed of the transparent conductive film of the resistive film and the touch position detection circuit.

In an image display device equipped with a resistive film type touch sensor, if the surface of the front panel is touched, the opposing resistive film will be short-circuited, and current will flow through the resistive film. The touch position detection circuit detects the voltage change at this time and detects the touched position.

As an example of a capacitive coupling type touch sensor, a component composed of a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position detection circuit can be cited. In an image display device equipped with a capacitively coupled touch sensor, if the surface of the front panel is touched, the transparent electrode will be 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 detects the touched position.

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 pattern of the touch sensor is formed on the base film. The example of the base film can be the same as the example in the description of the above-mentioned protective film. The thickness of the touch sensor pattern may be, for example, 1 μm or more and 20 μm or less.

The laminated film 100 with a touch sensor panel may be, for example, a laminated film having a substrate (preferably a front panel, more preferably a display flexible front panel), a touch sensor and a polarizing layer in sequence, or The sequence has a laminate film of a substrate (preferably a front panel, more preferably a display flexible front panel), a polarizing layer and a touch sensor.

〔Back panel〕

The back plate may have, for example, a plate-shaped body that can penetrate light. The back panel may be composed of only one layer, or may be composed of two or more layers.

Like the front panel, the back panel includes, for example, a plate-shaped body made of glass (for example, a glass plate, glass film, etc.) and a plate-shaped body made of resin (for example, a resin plate, a resin sheet, a resin film, etc.).

Among the above, from the viewpoint of flexibility of the laminated body 100 and the display device including the laminated body 100, it is preferably one that exhibits flexibility, and more preferably a resin-made plate-shaped body that exhibits flexibility.

Examples of the resin-made plate-shaped body include a resin film composed of a thermoplastic resin. The specific example of the thermoplastic resin refers to the description on the front panel. The thermoplastic resin is preferably a cellulose resin, (meth)acrylic resin, cyclic polyolefin resin, polyester resin, polycarbonate resin, or the like.

The back plate may be a base film coated with a polymerizable liquid crystal compound.

When the back plate is a light-permeable plate-shaped body, from the viewpoint of making the laminated film 100 thinner, the thickness is preferably 15 μm or more and 200 μm or less, more preferably 20 μm or more and 150 μm or less, and still more preferably 30 μm or more and 130 μm the following.

The thickness of the laminated film varies depending on the required function of the laminated film and the purpose of the laminated film, so it is not particularly limited, but for example, it can be 25 μm or more and 1000 μm or less, preferably 100 μm or more and 500 μm or less, more preferably 100 μm or more and 300 μm. the following.

[Example]

Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these.

(Manufacturing example 1)

A polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 20 μm was stretched to about 4 times in a dry uniaxial manner, and kept in a tight state. After immersing in pure water at 40°C for 1 minute , Immerse in an aqueous solution with a weight ratio of iodine/potassium iodide/water of 0.1/5/100 at 28°C for 60 seconds. After that, it was immersed in an aqueous solution with a weight ratio of potassium iodide/boric acid/water of 10.5/7.5/100 at 68°C for 300 seconds. Then, after washing with pure water at 5°C for 5 seconds, it was dried at 70°C for 180 seconds to obtain a polarizer in which iodine was adsorbed and aligned in a uniaxially stretched polyvinyl alcohol film. The thickness of the polarizer is 7 μm.

A thermoplastic resin film composed of a cyclic olefin resin with a thickness of 50μm is subjected to corona treatment on each of the bonding surfaces, and then bonded to the surface via a photo-curing adhesive (epoxy-based photo-curing adhesive) One side of the obtained polarizer is obtained, and a polarizing plate is obtained.

On the surface of the polarizer that the polarizer has on the opposite side to the thermoplastic resin film, the following layers are bonded to obtain the structure having the same structure as that described in FIG. 4 except that it does not have the second adhesive layer 21 The constitution" is a build-up film with a thickness of 16μm.

The first adhesive layer 20: thickness 5μm

Optical function layer 30: a λ/2 plate composed of a hardened liquid crystal compound layer and an alignment film, with a thickness of 3μm

Adhesive layer 40: thickness 5μm

Optical function layer 31: A λ/4 plate composed of a hardened liquid crystal compound layer and an alignment film, with a thickness of 3μm

(Manufacturing example 2)

Except for bonding the thermoplastic resin film on both sides of the polarizer and laminating the optical function layer on a thermoplastic resin film, the rest is the same as in Manufacturing Example 1, and obtained with "except that the second adhesive layer 21 is not provided, the rest is as shown in the figure 5 "The same structure as the above-mentioned laminated film."

<Example 1>

50 laminated films are laminated to form a laminated body. The cutting system uses an end mill with a diameter of 2 mm and two blades. First, the end mill is moved in a direction perpendicular to the surface of the layered body, a through hole is formed with the bottom edge of the end mill, and the end mill is arranged so as to penetrate the through hole (through hole forming step and arrangement step). After that, as shown in FIG. 2(A), the end mill is relatively moved so as to be spiral when viewed from the direction perpendicular to the surface of the laminate, and the laminate film is cut (first cutting step) , Forming a circular cave with a diameter of 3mm. At this time, so that the rotatable shank of the end mill is perpendicular to the main surface of the laminated film, and while the end mill is relatively moved in a direction parallel to the main surface of the laminated film, While cutting. The spiral is set to a circular motion in a manner that the radius of each half turn increases by 0.05 mm, and the pitch of the spiral is 0.10 mm. The feed speed of the end mill is 500 mm/min, and the rotation speed is 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, except that the feed rate of the end mill was 500 mm/min and the number of revolutions was 40,000 rpm, the cutting of the laminate was performed in the same manner as in Example 1.

<Example 4>

In the first cutting step, except that the feed speed of the end mill was 500 mm/min and the number of revolutions was 30,000 rpm, the cutting of the laminate was performed in the same manner as in Example 1.

<Comparative Example 1>

Except that the movement path of the end mill is different from that of the first embodiment, the cutting of the laminated body is performed in the same manner as that of the first embodiment. First, the end mill is moved in a direction perpendicular to the surface of the layered body, and a through hole is formed with the bottom edge of the end mill. After that, repeat the linear motion of 0.10mm and the circular motion of increasing the radius by 0.10mm as shown in Figure 2(B), cutting so that the pitch becomes 0.10mm, forming a circular cavity with a diameter of 3mm .

<Comparative Example 2>

The cutting was performed in the same manner as in Comparative Example 1, except that the distance of linear motion was set to 0.05 mm, the radius of circular motion was gradually increased by 0.05 mm, and the thread pitch was set to 0.05 mm.

<Comparative Example 3>

Except that the distance of linear motion is set to 0.15mm, the radius of circular motion is gradually increased by 0.15mm, and the thread pitch is set to 0.15mm, the cutting is performed in the same manner as in Comparative Example 1.

[Measurement of delamination]

The laminate was roughly divided into three parts in the lamination direction, each as the upper layer, the middle layer, and the lower layer. One sheet was selected from about the center of each layer, and the cut part of the cut laminate film was observed under an optical microscope. The maximum amount of interlayer peeling (the length of the interlayer peeling generated in the direction of the main surface of the laminated film) Those with a value of 80 μm or less are evaluated as "A", those with a value of 81 μm or more and 150 μm or less are evaluated as "B", and those with 151 μm or more are evaluated as "C".

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 are shown in Table 1.

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

Regardless of whether it is in the laminated film of Production Example 1 or in the laminated film of Production Example 2, compared with Comparative Example 1 and Comparative Example 2, Example 1 suppresses delamination. In Comparative Example 1 and Comparative Example 2, in particular, a large amount of delamination was observed in the cutting portion that performed linear motion. According to the manufacturing method of the present invention, it is possible to manufacture a laminated film that has undergone cutting processing in which delamination is more suppressed. Compared with Comparative Examples 1 and 2, in Example 1, the occurrence of cracking and lack of paste was also suppressed.

The maximum value of the delamination amount when the laminated film of Production Example 1 was cut by the method described in Example 1 and Comparative Examples 1 to 3 is shown in FIG. 6. The laminated film is selected from the lower layer of the laminated body.

From the results of Comparative Examples 1 to 3, it can be seen that in the cutting method that repeats linear motion and circular motion, as the thread pitch increases, the delamination increases. The laminated film belonging to the lower layer of the laminated body is prone to interlayer peeling due to cutting processing. In order to suppress delamination, the thread pitch can be reduced. However, if the thread pitch is reduced, the time required for cutting to form a cavity of the target size becomes longer. According to the manufacturing method of the present invention, delamination can be suppressed even if the thread pitch is large, so the cutting time can be shortened.

Claims (13)

A method for manufacturing a cut-processed laminated film includes: a first cutting step, viewing from a direction perpendicular to the main surface of the laminated film, and performing an operation of relatively moving a cutting tool in a spiral shape, thereby cutting The aforementioned laminated film. The manufacturing method according to claim 1, wherein the cutting tool has a rotatable shank and a peripheral edge, The outer peripheral blade is integrated with the shank. The manufacturing method according to claim 2, wherein in the first cutting step, the operation of relatively moving the cutting tool is performed in a state where the shank system is perpendicular to the main surface of the laminated film. 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 . The manufacturing method according to any one of claims 1 to 4, further comprising: The through hole forming step is to form a through hole before the first cutting step, and the through hole penetrates in a direction perpendicular to the main surface of the laminated film; and The arrangement step is to arrange 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 manufacturing method according to claim 6, wherein the cutting tool has a rotatable shank, a peripheral edge, and a bottom edge, The outer peripheral blade and the bottom blade are respectively integrated with the shank. The manufacturing method according to any one of claims 1 to 7, wherein in the first cutting step, the pitch of the spiral 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 grinding step of grinding the cut part formed by the aforementioned first cutting step. The manufacturing method according to any one of claims 1 to 9, further comprising a second cutting step in which the laminated film obtained by the first cutting step is parallel to the main surface of the laminated film The direction causes the cutting tool to move relatively to perform further cutting. The manufacturing method according to any one of claims 1 to 10, wherein the laminated film is a film for a display device. The manufacturing 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 in the first cutting step, a plurality of pieces of the laminated film are stacked and cut.

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