WO2020110644A1 - Procédé de production d'un film découpé - Google Patents

Procédé de production d'un film découpé Download PDF

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Publication number
WO2020110644A1
WO2020110644A1 PCT/JP2019/043594 JP2019043594W WO2020110644A1 WO 2020110644 A1 WO2020110644 A1 WO 2020110644A1 JP 2019043594 W JP2019043594 W JP 2019043594W WO 2020110644 A1 WO2020110644 A1 WO 2020110644A1
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cut film
cut
film
laser
thermoplastic resin
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PCT/JP2019/043594
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English (en)
Japanese (ja)
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拓也 三浦
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日本ゼオン株式会社
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to a method for manufacturing a cut film.
  • a film including a thermoplastic resin layer may be used as an optical film provided in an image display device.
  • such films have been required to have higher precision when processed according to the form of the final product. Therefore, as a film processing method, a laser beam processing method may be used because it can be processed more precisely than mechanical cutting with a knife (Patent Documents 1 and 2).
  • Patent Documents 1 and 2 the technique described in Patent Document 3 is known as a technique related to laser processing.
  • the laser-affected zone is usually formed around the cut surface.
  • the laser treatment affected area means a portion where the thermoplastic resin layer contained in the film cut by the laser beam is deformed by the heat generated at the time of cutting.
  • the deformation of the thermoplastic resin layer includes both increasing the thickness of the thermoplastic resin layer and decreasing the thickness of the thermoplastic resin layer. If the width and height of such a laser-affected zone are large, it may cause swelling of the edges of the film, dimensional changes, and wrinkles. Therefore, it is required to develop a cutting method that can reduce the width and height of the laser-affected zone.
  • the present invention provides a method capable of producing a cut film in which a pre-cut film containing a thermoplastic resin layer is cut with a laser beam to suppress irregularities in a cut surface and a width of a laser treatment affected portion is small. With the goal.
  • the present inventor has conducted studies to solve the above problems. As a result, the present inventor has found that the above problems can be solved by using a laser beam in a specific wavelength range and cutting a film having an absorbance in a specific range, and completed the present invention. That is, the present invention includes the following.
  • the present invention it is possible to provide a method for producing a cut film in which a pre-cut film containing a thermoplastic resin layer is cut with a laser beam to suppress unevenness on a cut surface and a width of a laser treatment affected portion is small.
  • FIG. 1 is a cross-sectional view schematically showing a cut film manufactured from a pre-cut film including a thermoplastic resin layer as an example.
  • FIG. 2 is a cross-sectional view schematically showing a cut film manufactured from a pre-cut film including a thermoplastic resin layer and a polarizer layer as another example.
  • the “long” film refers to a film having a length of 5 times or more with respect to the width, preferably having a length of 10 times or more, specifically, a roll.
  • the upper limit of the length of the film is not particularly limited and may be, for example, 100,000 times or less the width.
  • a method of manufacturing a cut film according to an embodiment of the present invention includes cutting a pre-cut film including a thermoplastic resin layer with laser light having a specific wavelength to obtain a cut film. According to the method for manufacturing a cut film of the present embodiment, it is possible to suppress unevenness on the cut surface of the cut film, and it is possible to reduce the width of the laser-processed portion in the cut film.
  • the method for manufacturing a cut film according to this embodiment includes a step of preparing a pre-cut film.
  • the pre-cut film is a target to be cut in the manufacturing method according to the present embodiment.
  • the pre-cut film has a specific range of absorbance at the wavelength of the laser light used for cutting.
  • the absorbance of the pre-cut film at the wavelength of the laser light is 0.02 or more, preferably 0.03 or more, more preferably 0.04 or more. Since the pre-cut film has an absorbance in this range, the pre-cut film can be cut with a laser beam.
  • the upper limit of the absorbance is not particularly limited, but is usually 4.0 or less, preferably 3.0 or less, and more preferably 2.0 or less from the viewpoint of facilitating the acquisition of the pre-cut film.
  • the absorbance in the range of ⁇ 5 nm before and after the wavelength of the laser beam used for cutting is measured, and the averaged value can be taken as the absorbance at the wavelength of the laser beam.
  • the absorbance of the pre-cut film indicates the absorption of light transmitted from one surface of the pre-cut film to the other surface.
  • the absorbance at the wavelength of laser light can be measured by an ultraviolet-visible spectrophotometer (eg, "UV-1800" manufactured by Shimadzu Corporation).
  • Examples of the method for adjusting the absorbance of the pre-cut film to a desired value include a method in which a polymer having absorption in the wavelength of laser light is used as the polymer contained in the thermoplastic resin layer; and light capable of absorbing laser light. Examples include a method using a thermoplastic resin containing an absorbent.
  • the pre-cut film includes a thermoplastic resin layer.
  • the thermoplastic resin layer is a layer formed of a thermoplastic resin.
  • the thermoplastic resin usually contains a thermoplastic polymer. As the polymer contained in the thermoplastic resin, one kind may be used alone, or two kinds or more may be used in combination at an arbitrary ratio.
  • the polymer examples include alicyclic structure-containing polymer, triacetyl cellulose, polyethylene terephthalate, and polycarbonate.
  • the alicyclic structure-containing polymer is preferable because it has excellent properties such as transparency, dimensional stability, retardation exhibiting property, and stretchability at low temperature.
  • the thermoplastic resin containing the alicyclic structure-containing polymer may be hereinafter referred to as “alicyclic structure-containing resin”. Therefore, the thermoplastic resin layer is preferably a layer of alicyclic structure-containing resin.
  • An alicyclic structure-containing polymer is a polymer in which the structural unit of the polymer has an alicyclic structure.
  • Alicyclic structure-containing polymer a polymer having an alicyclic structure in the main chain, a polymer having an alicyclic structure in the side chain, a polymer having an alicyclic structure in the main chain and side chains, and, It can be a mixture of any two or more of these.
  • a polymer having an alicyclic structure in the main chain is preferable from the viewpoint of mechanical strength and heat resistance.
  • alicyclic structure examples include a saturated alicyclic hydrocarbon (cycloalkane) structure and an unsaturated alicyclic hydrocarbon (cycloalkene, cycloalkyne) structure.
  • cycloalkane structure and a cycloalkene structure are preferable, and a cycloalkane structure is particularly preferable, from the viewpoint of mechanical strength and heat resistance.
  • the number of carbon atoms constituting the alicyclic structure is preferably 4 or more, more preferably 5 or more, preferably 30 or less, more preferably 20 or less, and particularly preferably, per alicyclic structure. Is 15 or less. When the number of carbon atoms constituting the alicyclic structure is within this range, the mechanical strength, heat resistance and moldability of the alicyclic structure-containing resin are highly balanced.
  • the proportion of structural units having an alicyclic structure can be selected according to the intended use of the cut film.
  • the proportion of the structural unit having an alicyclic structure in the alicyclic structure-containing polymer is preferably 55% by weight or more, more preferably 70% by weight or more, and particularly preferably 90% by weight or more.
  • the ratio of the structural unit having an alicyclic structure in the alicyclic structure-containing polymer is within this range, the transparency and heat resistance of the alicyclic structure-containing resin are good.
  • cycloolefin polymers are preferable.
  • the cycloolefin polymer is a polymer having a structure obtained by polymerizing a cycloolefin monomer.
  • the cycloolefin monomer is a compound having a ring structure formed of carbon atoms and having a polymerizable carbon-carbon double bond in the ring structure.
  • Examples of the polymerizable carbon-carbon double bond include a carbon-carbon double bond capable of polymerization such as ring-opening polymerization.
  • examples of the ring structure of the cycloolefin monomer include a monocycle, a polycycle, a condensed polycycle, a bridged ring, and a polycycle combining these.
  • a polycyclic cycloolefin monomer is preferable from the viewpoint of highly balancing the properties such as dielectric properties and heat resistance of the resulting polymer.
  • cycloolefin polymers preferred are norbornene-based polymers, monocyclic cycloolefin-based polymers, cyclic conjugated diene-based polymers, and hydrides thereof.
  • the norbornene-based polymer is particularly preferable because it has good moldability.
  • Examples of the norbornene-based polymer include a ring-opening polymer of a monomer having a norbornene structure and its hydride; an addition polymer of a monomer having a norbornene structure and its hydride.
  • Examples of the ring-opening polymer of a monomer having a norbornene structure include ring-opening homopolymers of one kind of monomer having a norbornene structure and ring-opening of two or more kinds of monomers having a norbornene structure. Examples thereof include a copolymer, a monomer having a norbornene structure, and a ring-opening copolymer with an arbitrary monomer copolymerizable therewith.
  • addition polymers of monomers having a norbornene structure include addition homopolymers of one kind of monomer having a norbornene structure and addition copolymers of two or more kinds of monomers having a norbornene structure. And an addition copolymer with a monomer having a norbornene structure and any monomer copolymerizable therewith.
  • a hydride of a ring-opening polymer of a monomer having a norbornene structure is particularly preferable from the viewpoint of moldability, heat resistance, low hygroscopicity, dimensional stability, light weight and the like.
  • the alicyclic structure-containing resin may include any polymer other than the alicyclic structure-containing polymer in addition to the alicyclic structure-containing polymer.
  • the arbitrary polymer other than the alicyclic structure-containing polymer one type may be used alone, or two or more types may be used in combination at any ratio.
  • the proportion of the alicyclic structure-containing polymer in the alicyclic structure-containing resin is ideally 100% by weight, preferably 80% by weight or more, more preferably 90% by weight or more, and particularly preferably 99% by weight or more. Is. By setting the ratio of the alicyclic structure-containing polymer to be at least the lower limit value of the above range, an alicyclic structure-containing resin having a small haze can be obtained.
  • the thermoplastic resin may further contain optional components in addition to the polymer.
  • the optional component include a light absorber capable of absorbing laser light.
  • the content of the light absorber in the thermoplastic resin is preferably 20% by weight or less, more preferably 15% by weight or less, further preferably 10% by weight or less, usually 0% by weight or more, and 0.01% by weight. It may be more than.
  • colorants such as pigments and dyes; optical brighteners; dispersants; plasticizers; heat stabilizers; light stabilizers; antistatic agents; antioxidants; fine particles; surfactants and the like.
  • additives include additives.
  • the thermoplastic resin layer preferably has a high absorbance at the wavelength of the laser light used for cutting. Specifically, the absorbance of the thermoplastic resin layer at the wavelength of the laser light is preferably within the same range as the above-mentioned range of the absorbance of the uncut film. When the thermoplastic resin layer has such an absorbance, unevenness on the cut surface of the cut film can be effectively suppressed, and the width of the laser treatment affected portion in the cut film can be effectively reduced.
  • the thermoplastic resin layer may be stretched.
  • the polymer molecules in the layer are usually oriented and can have optical anisotropy. Therefore, optical characteristics such as retardation can be adjusted within a desired range.
  • the thickness of the thermoplastic resin layer is preferably 1 ⁇ m or more, more preferably 3 ⁇ m or more, even more preferably 5 ⁇ m or more, particularly preferably 10 ⁇ m or more, and preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, particularly preferably It is 100 ⁇ m or less.
  • the thickness of the thermoplastic resin layer is at least the lower limit value of the above range, handling of the pre-cut film and the cut film becomes easy. Moreover, when it is at most the upper limit value, cutting with laser light becomes easy.
  • the pre-cut film may be a film having a single-layer structure having only one layer or a film having a multi-layer structure having two or more layers.
  • the pre-cut film may include a plurality of thermoplastic resin layers formed of thermoplastic resins having different compositions.
  • the pre-cut film may further include a polarizer layer as an arbitrary layer other than the thermoplastic resin layer.
  • a polarizer layer for example, polyvinyl alcohol, a film of a suitable vinyl alcohol-based polymer such as partially formalized polyvinyl alcohol, a dyeing treatment with a dichroic substance such as iodine and a dichroic dye, a stretching treatment, and a crosslinking treatment.
  • a film that has been subjected to an appropriate treatment such as, and the like in an appropriate order and manner.
  • a polarizer layer made of a polyvinyl alcohol resin film containing polyvinyl alcohol is preferable.
  • Such a polarizer layer is capable of transmitting linearly polarized light when natural light is incident thereon, and is particularly preferably one having excellent light transmittance and polarization degree.
  • the thickness of the polarizer layer is generally 5 ⁇ m to 80 ⁇ m, but is not limited to this.
  • the pre-cut film may include any layer such as an adhesive layer in addition to the polarizer layer.
  • the thermoplastic resin layer is arranged on the outermost side. Further, it is preferable to install a pre-cut film on the laser oscillator side so that the thermoplastic resin layer faces and cut with a laser beam. Thereby, the unevenness on the cut surface of the cut film can be effectively suppressed, and the width of the laser treatment affected portion in the cut film can be effectively reduced.
  • the pre-cut film may be a long film or a sheet of film, and is preferably a long film.
  • the thickness of the film before cutting is preferably 1 ⁇ m or more, more preferably 3 ⁇ m or more, even more preferably 5 ⁇ m or more, particularly preferably 10 ⁇ m or more, and preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less, particularly preferably 60 ⁇ m. It is below.
  • the thickness of the pre-cut film is not less than the lower limit of the above range, the pre-cut film and the cut film can be easily handled. Moreover, when it is at most the upper limit value, cutting with laser light becomes easy.
  • the pre-cut film is cut with a laser beam to obtain a cut film.
  • a laser beam is emitted from a laser oscillator, and the laser beam is applied to the portion to be cut of the pre-cut film to cut the film.
  • the wavelength of laser light used for cutting is 900 nm or longer, preferably 1000 nm or longer, and 3000 nm or shorter, preferably 2000 nm or shorter.
  • the wavelength of the laser light is within the above range, it is possible to suppress the unevenness on the cut surface of the cut film, and it is possible to reduce the width of the laser treatment affected portion in the cut film.
  • the wavelength of the laser light can be set to a desired value by appropriately selecting the laser medium of the laser oscillator that emits the laser light.
  • a solid medium can be preferably used as the laser medium.
  • Types of laser oscillators using a solid medium include YAG laser, ruby laser, glass laser, YVO 4 laser, fiber laser, ZnSe laser, ZnS laser, and photoexcited semiconductor laser oscillators.
  • the laser medium it is possible to use a medium containing a base material suitable for emitting a laser beam having a desired wavelength as described above.
  • a base material suitable for emitting a laser beam having a desired wavelength as described above.
  • the base material include YAG, YVO 4 , ZnSe, and ZnS.
  • a solid medium formed by crystallizing these materials can be preferably used as a laser medium.
  • the laser medium may include the host material described above and a dopant.
  • dopants include ytterbium, holmium, thulium, erbium, titanium, and neodymium.
  • host materials that make up the laser medium include Nd:YAG, Nd:YVO 4 , Er:YAG, Ho:YAG, Cr:ZnSe, and Cr:ZnS.
  • the base material By using the laser medium composed of these dopants: the base material, laser light having a desired wavelength can be easily obtained.
  • the laser light is preferably pulsed laser light.
  • the pulse width of the pulsed laser light is preferably 500 ps or less, more preferably 300 ps or less, and even more preferably 100 ps or less.
  • the frequency of the pulsed laser light is preferably 1 kHz or higher, more preferably 10 kHz or higher, preferably 1 GHz or lower, more preferably 100 MHz or lower.
  • a pulsed laser is a laser that emits light in a pulse configured by turning on and off the output, and a pulse width is a length of time from on to off in one shot pulse.
  • the frequency of the pulsed laser light is the number of cycles formed by turning on and off in one second, and one cycle is composed of a combination of time from on to off and time from off to next on. To be done.
  • pulsed laser light By using such pulsed laser light, it is possible to effectively suppress the generation of heat due to the irradiation of the laser light. As a result of suppressing the generation of heat, unevenness on the cut surface of the cut film can be effectively suppressed, and the width of the laser treatment affected portion in the cut film can be effectively reduced. Furthermore, a small pulse width and a small frequency usually enable a particularly precise cutting process, which is particularly advantageous in a smooth curve process.
  • the lower limit of the pulse width is not particularly limited, but may be 50 fs or more, for example.
  • the average output (output intensity) of the laser light is preferably 0.1 W or more, more preferably 1 W or more, further preferably 5 W or more, preferably 200 W or less, more preferably 100 W or less, further preferably 50 W or less. ..
  • the output intensity of the laser light is equal to or higher than the lower limit value of the above range, the pre-cut film can be quickly cut.
  • it is at most the upper limit value unevenness on the cut surface of the cut film can be effectively suppressed, and the width of the laser treatment affected portion in the cut film can be effectively reduced.
  • the number of laser light irradiations may be once or multiple times. For example, a certain point of the pre-cut film may be irradiated with pulsed laser light a plurality of times to cut the pre-cut film at the point. Further, for example, the pre-cut film may be cut along the line by irradiating laser light so as to repeatedly scan the same line of the pre-cut film.
  • the specific number of irradiations can be appropriately set according to factors such as the thickness of the film before cutting and the output intensity of laser light.
  • a cut film can be manufactured.
  • the cut film is a film obtained by cutting the pre-cut film, and thus includes a thermoplastic resin layer.
  • the pre-cut film includes any layers such as an adhesive layer and a polarizer layer, the cut film also includes any such layers.
  • the composition, physical properties and thickness of these thermoplastic resin layers and optional layers are usually the same as those in the uncut film.
  • the cut film manufactured by the manufacturing method according to the present embodiment can suppress the formation of irregularities on the cut surface of the thermoplastic resin layer. Therefore, the cut film can usually have a flat cut surface by laser light.
  • the cut film manufactured by the manufacturing method according to the present embodiment can reduce the width and height of the laser-affected zone in the thermoplastic resin layer.
  • the width of the laser-affected zone in the thermoplastic resin layer of the cut film can be preferably 60 ⁇ m or less, more preferably 50 ⁇ m or less.
  • the lower limit of the width of the laser-affected zone is ideally 0 ⁇ m, but it may be 1 ⁇ m or more.
  • the height of the laser-affected zone in the thermoplastic resin layer of the cut film (hereinafter sometimes simply referred to as “affected zone height”) can be preferably 30 ⁇ m or less, more preferably 19 ⁇ m or less.
  • the lower limit of the affected portion height is ideally 0 ⁇ m, but may be 1 ⁇ m or more.
  • the width and height of the laser-affected zone can be measured by the following method.
  • the cut film is cut using a microtome.
  • cutting using a microtome is performed so that a cross section perpendicular to the line in which the laser beam scans the surface of the film before cutting is scanned.
  • the width L and the height H of the laser treatment affected part can be measured.
  • FIG. 1 is a cross-sectional view schematically showing a cut film manufactured from a pre-cut film including a thermoplastic resin layer as an example.
  • a laser processing affected portion 111 may be formed as a portion deformed by heat generated during cutting.
  • the laser-affected zone 111 of the thermoplastic layer 110 includes: A cut surface 112 of the thermoplastic resin layer 110. A portion 113 where the thickness of the thermoplastic resin layer 110 is thicker than that before cutting in a region adjacent to the cut surface 112 of the thermoplastic resin layer 110.
  • the portion 113 in which the thickness of the thermoplastic resin layer 110 is thicker than before cutting is often observed as a portion that is higher than the portion 114 other than the laser processing affected portion 111.
  • the width L of the laser treatment affected area is the width in the in-plane direction of the film in the portion of the thermoplastic resin layer 110 of the cut film 100 affected by the laser treatment. That is, the width L is the distance from the position of the portion closest to the center X of the cut portion to the position of the portion farthest from the center X of the cut portion and affected by the laser processing.
  • the in-plane direction of the film means a direction perpendicular to the thickness direction of the film.
  • the width L of the laser-affected zone 111 is the distance between the following two positions: The position of the cut surface 112 of the thermoplastic resin layer 110 that is closest to the center X of the cut portion. The position of the end of the portion 113 where the thickness D of the thermoplastic resin layer 110 is thicker than before cutting, opposite to the cut surface 112.
  • the height H of the laser processing affected area is the height of the portion of the thermoplastic resin layer 110 of the cut film 100 that is affected by the laser processing. That is, as shown in FIG. 1, the height H is the distance between the level of the top 113U of the thickened portion 113 and the level of the upper surface 114 of the portion 114 other than the laser processing-affected portion 111.
  • FIG. 2 is a cross-sectional view schematically showing a cut film manufactured from a pre-cut film including a thermoplastic resin layer and a polarizer layer as another example.
  • the width L of the laser processing affected area 211 can be determined as in the cut film 100 shown in FIG. Specifically, the width L of the laser-affected zone 211 is the distance between the following two positions: The position of the portion of the cut surface 212 of the cut film 200 closest to the center X of the cut portion. The position of the end of the portion 213 where the thickness D of the cut film 200 is thicker than before cutting, opposite to the cut surface 212.
  • the cut film thus obtained may be optionally treated, if necessary.
  • an optional treatment include a stretching treatment, a surface treatment, a laminating treatment with another film, and the like.
  • the cut film can be used for any purpose.
  • a cut film may be used as an optical film.
  • the cut film may be used alone or in combination with any other member.
  • it may be incorporated into a display device such as a liquid crystal display device, an organic electroluminescence display device, a plasma display device, an FED (field emission) display device, and a SED (surface electric field) display device.
  • the cut film may be used as a protective film for the polarizer.
  • a Fourier transform infrared spectrophotometer (“Frontier MIR/NIR” manufactured by Perkin Elmer Japan Co., Ltd.) was used for measuring the absorbance in the thickness direction of the pre-cut film in Comparative Example 1.
  • the transmission method was adopted as the measuring method.
  • the measurement wavelength is in a range including ⁇ 5 nm before and after the laser light wavelength used for cutting (that is, 10.595 ⁇ m to 10.605 ⁇ m), and by taking an average of the range of ⁇ 5 nm before and after the laser light wavelength used for cutting, Absorbance was determined.
  • the sample film having a cut surface by laser light was observed to examine the presence or absence of an uncut portion.
  • the sample film was cut using a microtome. At this time, cutting using a microtome was performed so that a cross section perpendicular to the line scanned by the laser beam was obtained.
  • the cross section of this microtome was observed with an optical microscope, and the presence or absence of unevenness on the cut surface due to laser light was examined. From the results thus examined, the section cut by the laser beam was evaluated according to the following criteria.
  • Example 1 (1-1. Step of preparing pre-cut film)
  • an alicyclic structure-containing resin containing a norbornene-based polymer (“Zeonor” manufactured by Nippon Zeon Co., glass transition temperature 138° C.) was prepared.
  • This alicyclic structure-containing resin was melt-extruded into a film form using a T-die type film melt extrusion molding machine to obtain a pre-cut film consisting of only the alicyclic structure-containing resin layer.
  • the melt extrusion conditions were a die lip of 800 ⁇ m, a T-die width of 300 mm, a molten resin temperature of 260° C., and a cast roll temperature of 115° C.
  • the thickness of the film before cutting that is, the thickness of the resin layer was 25 ⁇ m.
  • the absorbance of the film before cutting was measured.
  • the measurement was performed according to the above-mentioned "Measurement method of absorbance". Therefore, in this example, measurement was performed in the measurement wavelength range of 1059 nm to 1069 nm. Since the average of the absorbances at the wavelengths of 1059 nm to 1069 nm was 0.02, it was confirmed that the absorbance at the wavelength of the pulsed laser light in the cutting step was 0.02 or more.
  • Nd:YAG laser oscillator (“RAPID NX” manufactured by Coherent Co., Ltd.) was prepared as a laser oscillator. From this laser oscillator, pulsed laser light was emitted with the wavelength, pulse width and output shown in Table 1. The surface of the pre-cut film was irradiated with this pulsed laser light, and the surface of the pre-cut film was linearly scanned with the laser light. The scanning speed and the number of scans were appropriately adjusted, and irradiation was performed until cutting at the scanning line was achieved. As a result, a cut film having a cut surface was obtained. The obtained cut film was evaluated by the method described above.
  • Examples 2 to 9 and Comparative Example 1 The pre-cut film, type of laser oscillator, laser wavelength, laser pulse width, and laser oscillator output were changed as shown in Table 1.
  • Comparative Example 1 the same film as that used in Example 1 was used as the pre-cut film. Except for these changes, the pre-cut film was prepared, the absorbance was measured, the cutting step was performed, and the cut film was evaluated by the same operations as in Example 1. The details of the changes are as follows.
  • Examples 4 to 6 as the pre-cut film, a film having a thickness of 30 ⁇ m and including only a layer of the alicyclic structure-containing resin was used.
  • This pre-cut film was prepared by the same operation as in (1-1) of Example 1 except that the conditions for melt extrusion of the alicyclic structure-containing resin were changed.
  • Example 7 a commercially available PET (polyethylene terephthalate) film (Lumirror T60, manufactured by Toray Industries, Inc.) having a thickness of 50 ⁇ m was used as the film before cutting.
  • PET polyethylene terephthalate
  • Example 8 a 75 ⁇ m-thick fill film including a layer of alicyclic structure-containing resin and a layer of PVA (polyvinyl alcohol) was used as the pre-cut film.
  • the method for preparing this film is as follows. That is, a film having a thickness of 25 ⁇ m and formed of a resin containing iodine and polyvinyl alcohol was prepared as a polarizer layer. In this polarizer layer, iodine was adsorbed to polyvinyl alcohol in an oriented state.
  • the layer of the alicyclic structure-containing resin produced in Example 1 was attached to one surface of this polarizer layer using an adhesive.
  • As the adhesive CS9621 (manufactured by Nitto Denko Corporation) was used.
  • a pre-cut film including a layer of the alicyclic structure-containing resin, an adhesive layer (thickness 25 ⁇ m), and a polarizer layer was obtained in this order.
  • the laser light was irradiated so that the laser light was incident on the surface of the pre-cut film on the side of the alicyclic structure-containing resin layer.
  • the laser oscillator used in each of the examples and comparative examples is as follows.
  • Examples 1, 7 and 8 Product name "RAPID NX", manufactured by Coherent Example 2: Product name “RAPID FX”, manufactured by Coherent Example 3: Product name "SUPER RAPID-HE”, manufactured by Coherent Inc. 4: Product name "ELPP-1645", manufactured by IPG Photonics, Inc.
  • Example 5 Product name "HLPP-2090", manufactured by IPG Photonics, Inc.
  • Example 6 Product name "CLPF-2400-10-70-1,” IPG Photonics Manufactured
  • Example 9 Product name "MATRIX 1064-10-30", manufactured by Coherent Comparative Example 1: Product name "J-3-10.6", manufactured by Coherent Co., Ltd.
  • the absorbance was measured in accordance with the above-mentioned "Method for measuring absorbance” in a wavelength range suitable for the wavelength of the laser light used.
  • Example 9 it was possible to perform cutting with a small affected portion height.
  • uneven shapes were recognized at the cross-section ends, and the cutting result was relatively poor.
  • Example 1 the boundary of the cut surface was slightly unclear, while in Examples 2 and 6, the boundary of the cut surface was clear. This is because, when the pulse width is relatively wide, the heat of the laser light was transmitted from the processed part to the periphery, whereas when the pulse width is relatively narrow, it is possible to break the molecular bonds before the heat is transmitted. It can be guessed that it was because it was done.
  • Comparative Example 1 there was an uneven shape due to heat melting at the end of the cross section, and the cut had a high affected portion height.
  • Cut Film 110 Thermoplastic Resin Layer 111 Laser-Influenced Area 112 Cut Surface 113 Thickened Area 113U Top of Thickened Area 114 Area Other than Laser-Influenced Area 114U Upper Surface of Area Except Laser-Influenced Area 200 Cut Film 210 Thermoplastic resin layer 211 Laser-treated affected area 212 Cut surface 213 Thickened portion 220 Polarizer layer L Laser-treated affected area width H Affected area height X Cutting point center A

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  • Polarising Elements (AREA)

Abstract

Ce procédé de fabrication d'un film découpé comprend l'obtention d'un film découpé par découpe d'un film prédécoupé comprenant une couche de résine thermoplastique, avec un faisceau laser ayant une longueur d'onde de 900-3000 nm, le film prédécoupé ayant une absorbance d'au moins 0,02 à la longueur d'onde du faisceau laser. Il est préférable que le milieu pour le faisceau laser soit une substance solide, et que son matériau de base soit YAG, YVO4, ZnSe, ou ZnS. Il est également préférable que le faisceau laser soit un faisceau laser pulsé ayant une largeur d'impulsion maximale de 100 ps.
PCT/JP2019/043594 2018-11-30 2019-11-07 Procédé de production d'un film découpé WO2020110644A1 (fr)

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JP2018-225218 2018-11-30

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WO2022085726A1 (fr) * 2020-10-23 2022-04-28 コニカミノルタ株式会社 Plaque de polarisation, son procédé de fabrication et procédé de fabrication de dispositif d'affichage

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JP2006307057A (ja) * 2005-04-28 2006-11-09 Nippon Synthetic Chem Ind Co Ltd:The ポリビニルアルコール系フィルムの製造方法、ポリビニルアルコール系フィルムおよび偏光膜、偏光板
JP2009294649A (ja) * 2008-05-07 2009-12-17 Nitto Denko Corp 偏光板、およびその製造方法
JP2010252298A (ja) * 2008-12-22 2010-11-04 Fujikura Ltd フィルムアンテナ及びその製造方法
JP2017514774A (ja) * 2014-03-04 2017-06-08 サン−ゴバン グラス フランスＳａｉｎｔ−Ｇｏｂａｉｎ Ｇｌａｓｓ Ｆｒａｎｃｅ 積層された極薄ガラス層を切断する方法
EP3343661A1 (fr) * 2016-12-29 2018-07-04 LG Display Co., Ltd. Appareil d'éclairage utilisant un dispositif électroluminescent organique et son procédé de fabrication

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Publication number Priority date Publication date Assignee Title
JP2006307057A (ja) * 2005-04-28 2006-11-09 Nippon Synthetic Chem Ind Co Ltd:The ポリビニルアルコール系フィルムの製造方法、ポリビニルアルコール系フィルムおよび偏光膜、偏光板
JP2009294649A (ja) * 2008-05-07 2009-12-17 Nitto Denko Corp 偏光板、およびその製造方法
JP2010252298A (ja) * 2008-12-22 2010-11-04 Fujikura Ltd フィルムアンテナ及びその製造方法
JP2017514774A (ja) * 2014-03-04 2017-06-08 サン−ゴバン グラス フランスＳａｉｎｔ−Ｇｏｂａｉｎ Ｇｌａｓｓ Ｆｒａｎｃｅ 積層された極薄ガラス層を切断する方法
EP3343661A1 (fr) * 2016-12-29 2018-07-04 LG Display Co., Ltd. Appareil d'éclairage utilisant un dispositif électroluminescent organique et son procédé de fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022085726A1 (fr) * 2020-10-23 2022-04-28 コニカミノルタ株式会社 Plaque de polarisation, son procédé de fabrication et procédé de fabrication de dispositif d'affichage

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