WO2012008278A1 - レーザーマーキングフィルム - Google Patents
レーザーマーキングフィルム Download PDFInfo
- Publication number
- WO2012008278A1 WO2012008278A1 PCT/JP2011/064441 JP2011064441W WO2012008278A1 WO 2012008278 A1 WO2012008278 A1 WO 2012008278A1 JP 2011064441 W JP2011064441 W JP 2011064441W WO 2012008278 A1 WO2012008278 A1 WO 2012008278A1
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- WO
- WIPO (PCT)
- Prior art keywords
- laser marking
- laser
- ink layer
- layer
- iron oxide
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/10—Duplicating or marking methods; Sheet materials for use therein by using carbon paper or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H6/00—Buildings for parking cars, rolling-stock, aircraft, vessels or like vehicles, e.g. garages
- E04H6/42—Devices or arrangements peculiar to garages, not covered elsewhere, e.g. securing devices, safety devices, monitoring and operating schemes; centering devices
- E04H6/422—Automatically operated car-parks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/288—Protective coatings for blades
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
- G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
- G03G7/0013—Inorganic components thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00127—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/9133—Decorative article for viewing from one side only, e.g. plaque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
- Y10T428/24901—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material including coloring matter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/256—Heavy metal or aluminum or compound thereof
- Y10T428/257—Iron oxide or aluminum oxide
Definitions
- the present invention relates to a laser marking film provided with an ink layer capable of forming a marking image by laser light irradiation.
- product information such as various distribution information (manufacturing date, expiration date, etc.) and product management information (serial number, etc.) has been printed on various industrial products in the form of line images such as barcodes and characters. ing.
- the laser printing method irradiates a laser marking print layer containing a laser light absorber with laser light and carbonizes the surrounding resin by the heat generated by the laser light absorber, resulting in a black image. Is to form.
- printing can be performed in a state in which a transparent or translucent protective layer is provided on the laser marking printing layer, and it is not necessary to form a protective layer after printing, but also in a three-dimensional manner.
- advantages such as easy printing on the part.
- Patent Documents 1 to 5 Various inks used for laser marking printing layers and laminates having such laser marking printing layers have been proposed (see Patent Documents 1 to 5).
- an object of the present invention is to provide a laser marking film provided with a laser marking ink layer that forms a clear image when irradiated with laser light for laser marking.
- iron oxide particularly red-brown iron oxide
- a clear laser marking image can be formed by irradiation with the laser light, and an ink layer in which red-brown iron oxide is dispersed is formed on a white underlayer. If it is, the inventors have found that a very clear laser marking image can be formed, and have completed the present invention.
- the present invention has a base film, a white base layer formed on the base film, and a laser marking ink layer formed on the base layer.
- the ink layer is provided with a laser marking film in which iron oxide is dispersed as a laser light absorber in an amount of 0.1 to 30 parts by weight per 100 parts by weight of the resin binder.
- the laser marking film of the present invention is (1) A white pigment is further dispersed in the ink layer, (2) In the ink layer, the iron oxide and the white pigment are dispersed in a weight ratio of 1: 5 to 1: 8000, (3) The iron oxide is reddish brown iron oxide, (4) A transparent or translucent protective layer is formed on the ink layer; (5) Use as a package, Is preferred.
- the laser marking film of the present invention when the laser beam for laser marking is irradiated, the laser beam irradiated part in the ink layer formed in the film generates heat, and the resin component of the irradiated part is carbonized. By changing the color to black, a clear marking image is formed on the ink layer.
- the laser marking film of the present invention is very inexpensive as compared with a film in which an ink layer is formed using, for example, a pearl pigment, and can greatly reduce the cost.
- a package for example, a pouch
- accurate information display about the contents is required. Therefore, since the laser marking film of the present invention can clearly form a barcode or a character image that displays various information by irradiating a laser beam, it is extremely useful for such a package. is there.
- red-brown iron oxide is an iron oxide pigment mainly composed of ⁇ -Fe 2 O 3 and having a tint adjusted to reddish brown by adjusting the particle size.
- the said numerical value is the value measured by the method prescribed
- red-brown iron oxide (Bengara) or yellow iron oxide as a laser light absorber
- a YAG laser having a wavelength of 1064 nm is irradiated to an ink layer in which these pigments are dispersed.
- the laser marking image to be produced has been required to be even clearer.
- an ink layer formed using an ink containing iron oxide, particularly red-brown iron oxide is irradiated with the same laser beam. By doing so, a clearer laser marking image can be formed.
- the laser marking film of the present invention it is important to provide a white underlayer between the ink layer in which the iron oxide is dispersed in the resin binder and the base material film.
- an extremely clear laser marking image is formed. That is, when the ink layer is irradiated with laser light, the reflected light from the white underlayer enters the ink layer, so that the laser light is sufficiently absorbed by iron oxide, and as a result, a high calorific value is obtained. This makes it possible to form an extremely clear laser marking image.
- the obtained laser marking image is inferior in sharpness.
- a clearer laser marking image can be formed by dispersing a white pigment together with iron oxide in the ink layer. That is, since the laser light incident on the ink layer is reflected and scattered by the white pigment, more laser light is irradiated to the iron oxide, and the iron oxide particles are applied from the surface layer part to the bottom part of the ink layer. Absorption of the laser beam occurs, and a higher calorific value is obtained. As a result, a clearer laser marking image can be formed.
- the absorption of laser light can be improved by forming the iron oxide as a readily available and inexpensive red-brown iron oxide, and a clearer laser marking image can be formed. It becomes.
- the laser marking film of the present invention indicated as a whole by 10 is oxidized on the base film 1, the white base layer 3 formed on the base film 1, and the base layer 3.
- a laser marking ink layer 5 in which iron is dispersed is provided, and a protective layer 7 is generally formed on the ink layer 5.
- Base film 1 As the base film 1, various papers, resin films, metal foils such as resin-coated aluminum foils, and the like are used depending on the use form of the laser marking film 10. From the viewpoint of the above, a resin film is preferable.
- the resin material for forming the resin film is not particularly limited, but in general, various thermoplastic resins such as low density polyethylene, high density polyethylene, polypropylene, poly 1-butene, poly 4 methyl-1- Pentene, polyolefins such as random or block copolymers of ⁇ -olefins such as ethylene, propylene, 1-butene, 4-methyl-1-pentene, cyclic olefin copolymers, etc .; and ethylene / vinyl acetate copolymer Ethylene, vinyl alcohol copolymer, ethylene / vinyl compound copolymer such as ethylene / vinyl chloride copolymer; polystyrene, acrylonitrile / styrene copolymer, ABS, ⁇ -methylstyrene / styrene copolymer, etc.
- various thermoplastic resins such as low density polyethylene, high density polyethylene, polypropylene, poly 1-butene, poly 4 methyl-1
- Styrenic resin polyvinyl chloride, polyvinylidene chloride, chloride
- Polyvinyl compounds such as vinyl / vinylidene chloride copolymer, polymethyl acrylate and polymethyl methacrylate
- polyamides such as nylon 6, nylon 6-6, nylon 6-10, nylon 11 and nylon 12
- polyethylene terephthalate poly Laser marking film 10 may be a thermoplastic polyester such as butylene terephthalate or polyethylene naphthalate; a polycarbonate; a polyphenylene oxide; a biodegradable resin such as polylactic acid; or a mixture thereof.
- those having an appropriate layer structure such as a single layer structure or a multilayer structure are used.
- this laser marking film 10 when this laser marking film 10 is applied for use as a packaging body such as a pouch, an olefin resin layer or a polyester resin layer is provided as an inner / outer layer, and an ethylene / vinyl alcohol copolymer is provided as an intermediate layer. It is preferable to have a multilayer structure in which a resin layer having excellent gas barrier properties such as coalescence is provided via an adhesive layer. Moreover, the thickness of the resin film should just be in an appropriate range according to the usage form.
- the white underlayer 3 is formed to increase heat generation due to laser absorption in the ink layer 5 formed thereon.
- the iron oxide particles in the ink layer 5 absorb the laser beam and generate heat even by the laser light reflected on the surface of the underlayer 3, so that the image is clearer.
- a laser marking image can be formed.
- Such a base layer 3 is a white solid layer in which a white pigment is dispersed in a resin binder as an inorganic pigment, and the white pigment is known per se, for example, amorphous silica, titanium oxide, carbonic acid. Calcium, clay, talc, etc. are typical, and in general, the volume-based average particle diameter D 50 measured by the laser diffraction scattering method is in the range of about 0.1 to 3 ⁇ m, so that sufficient laser light reflectivity can be obtained. It is preferable in securing.
- the amount of the white pigment and the thickness of the underlayer 3 are not particularly limited as long as sufficient hiding power is exhibited. Generally, the amount of the white pigment in the underlayer 3 is 100 per 100 parts by weight of the resin.
- the base layer 3 may have a thickness of about 0.1 to 10 ⁇ m. If the amount of the white pigment is too small or the thickness of the undercoat layer 3 is too thin, the reflection of the laser light at the undercoat layer 3 becomes insufficient, and the absorption of the iron oxide laser light dispersed in the ink layer 5 is absorbed. Becomes insufficient, and the sharpness of the laser marking image may be reduced.
- the adhesiveness with the base film 1 and the ink layer 5 of the base layer 3 will become inadequate, and it will become easy to produce delamination etc. Furthermore, even if the thickness of the underlayer 3 is increased more than necessary, the thickness of the film 10 is only increased unnecessarily, and the economic efficiency is impaired or the use of the film 10 is limited. .
- the resin material which forms the base layer 3 the resin material similar to the ink layer mentioned later is used.
- the amount of iron oxide is used in an amount of 0.1 to 30 parts by weight, particularly 0.2 to 20 parts by weight per 100 parts by weight of the resin binder. That is, if this amount is small, when the ink layer formed from this ink is irradiated with laser light for laser marking, the absorption of the laser light becomes insufficient and carbonization (thermal decomposition) of the resin is sufficiently generated. This makes it difficult to obtain a clear laser marking image. On the other hand, if the blending amount of iron oxide particles is too large, the thickness of the ink layer 5 becomes non-uniform, causing variations in laser absorbency, reducing the visibility of black laser marking images, or reducing the amount of resin. As a result, the laser marking image may become unclear.
- red-brown iron oxide which is easily available and inexpensive as the iron oxide, improves the absorption of laser light, and makes it possible to form a clearer laser marking image.
- a white pigment together with the iron oxide particles, and the combined use of such a white pigment causes reflection and scattering of laser light in the ink layer 5 to be formed.
- the laser light absorption of iron oxide increases, and a clearer laser marking image can be formed by increasing the amount of heat generation.
- Such a white pigment may be dispersed in the above-described underlayer 3, that is, amorphous silica, titanium oxide, calcium carbonate, clay, talc and the like.
- a white pigment usually has a weight ratio of iron oxide particles (A) to white pigment particles (B) of 1: 5 to 1: 8000, particularly 1:20 to 1: 2000 (A: B). It is preferable to use it in an amount that falls within the range. That is, if the amount of white pigment particles used is small, the laser absorption improvement effect due to the reflection of the white pigment particles is low, and if more than necessary, the surface reflection of the laser light at the ink layer 5 increases. As a result, the laser absorptivity decreases, and the formed laser marking image may become unclear. Furthermore, as a result of increasing the total amount of the inorganic pigment, the thickness of the ink layer 5 becomes non-uniform, and there is a possibility that variations in laser absorbency are likely to occur.
- the iron oxide particles and white pigment particles described above preferably have an appropriate particle size in order to uniformly disperse in the resin binder and to fully exhibit the laser absorption ability and laser reflection ability of each particle,
- the volume-based average particle diameter D 50 measured by a laser diffraction scattering method is preferably in the range of about 0.1 to 3 ⁇ m, like the white pigment in the underlayer 3 described above.
- the thickness of the laser marking ink layer 5 is preferably in the range of 0.1 to 10 ⁇ m, particularly 0.5 to 5 ⁇ m. That is, if the thickness of the ink layer 5 is too thin, the amount of resin that decomposes and carbonizes by irradiation with laser light decreases, and it may be difficult to obtain a clear laser marking image. Moreover, even if the ink layer 5 is excessively thick, the thickness of the laser marking film 10 becomes unnecessarily thick, and only the usage is limited, and no particular merit is produced.
- the protective layer 7 formed on the ink layer 5 is provided as necessary to protect a laser marking image or the like formed on the ink layer 5, and transmits a laser beam used for laser marking. Further, it is formed of a translucent or transparent resin.
- olefin resins acrylic resins, ethylene-ethyl acrylate copolymer resins, ethylene-vinyl acetate copolymer resins, vinyl chloride resins, polyester resins such as polyethylene terephthalate, polyvinyl acetate resins, polystyrene resins, polyimide resins Select and protect the type of laser light used for laser marking from among thermoplastic or thermosetting resins such as polycarbonate resin, polyurethane resin, epoxy resin, silicone resin, fluorine resin, etc. Layer 7 is formed.
- the thickness of the protective layer 7 can ensure transparency so that the laser marking image formed on the ink layer 5 can be visually recognized through the protective layer 7, and the laser marking image can be protected. It is only necessary to have a thickness that can be achieved.
- the film 10 for laser marking having the above-described layer structure is obtained by using the ink for forming the ink layer 5 for laser marking and the ink for forming the underlayer 3 on the protective layer 7 described above and the ink layer 5 and the underlayer 3. Are sequentially formed and then bonded to the base film 1 via an adhesive (not shown).
- the ink for the underlayer 3 or the ink for the ink layer 5 has a resin binder and an organic solvent, together with the inorganic pigments such as the white pigment and iron oxide (laser light absorber) described above, depending on the composition of these layers.
- the inorganic pigments such as the white pigment and iron oxide (laser light absorber) described above, depending on the composition of these layers.
- the resin binder used in the ink for the ink layer 5 is not particularly limited as long as it is rapidly pyrolyzed and carbonized by the heat generated by absorption of the laser beam of iron oxide.
- acrylic resin, polyamide Resin, urethane resin, chlorinated polypropylene, chlorinated rubber, polyester resin, nitrocellulose, etc. are used.
- the resin binder used in the ink for the underlayer 3 is not limited as described above, and may be any resin as long as it has a film forming ability. In consideration of adhesiveness with the ink layer 5 formed on the base layer 3, it is preferable to use the same type of resin binder used for forming the ink layer 5.
- the organic solvent is not particularly limited as long as it can dissolve the above-described resin binder, but generally, in any of the inks forming the underlayer 3 and the ink layer 5, the boiling point is low, Those that can be easily volatilized are used.
- aromatic hydrocarbon solvents such as benzene, toluene and xylene
- ester solvents such as ethyl acetate and butyl acetate
- alcohol solvents such as methanol, ethanol, isopropanol and butanol
- acetone, methyl ethyl ketone and methyl isobutyl ketone appropriate solvents can be used according to the type of resin binder used.
- the above-mentioned organic solvent is used in such an amount that the viscosity of the ink obtained by mixing each component is in a range suitable for the formation of a layer by coating.
- the ink it is preferable to use the ink in such an amount that the solid content concentration is about 15 to 50% by weight.
- the above-mentioned ink includes various auxiliary agents such as surfactants and antioxidants in consideration of the printability and physical properties of the ink as well as known inks.
- an antistatic agent, an antifoaming agent, and the like can be blended, and the blending amount should be an amount that does not impair the properties of the underlayer 3 and the ink layer 5.
- inorganic pigments or organic pigments other than the iron oxide particles and white pigment particles described above can be appropriately blended as a colorant. In this case, a black color formed by laser light irradiation is used. It is necessary to have a hue that does not impair the visibility of the laser marking image.
- the ink described above can be prepared by a method known per se.
- a vehicle is prepared by dissolving the resin binder described above in an organic solvent, and an inorganic pigment (iron oxide particles or white pigment particles) is added to the vehicle. And, if necessary, various auxiliary agents are added and mixed.
- the ink layer 5 for laser marking and the white base layer 3 using the ink as described above are applied by drying the ink on the protective layer 7 or the laser marking ink layer 5 by a method known per se. It is formed by. For example, by applying gravure printing, screen printing, blade coating, or the like so that the dry thickness becomes a predetermined thickness, and then drying to evaporate the organic solvent, the laser marking ink layer 5 and the white undercoat are removed.
- the formation 3 can be formed.
- the protective layer 7 may be cured by heat, electron beam, ultraviolet rays, etc., depending on the type of resin constituting the protective layer 7, such as extrusion lamination or the like, and applying a resin solution and drying (removing the solvent). It can be easily formed by means of performing.
- the laser marking film 10 formed as described above can form a clear laser marking image on the ink layer 5 by irradiation with laser light through the protective layer 7, it can be used in various applications.
- the film 10 is cut into an appropriate size, and depending on the type of the base film 1, a heat seal or a suitable adhesive is used for packaging containers such as metal cans and plastic containers, and various industrial products.
- it can also be used as packaging bodies, such as a bag-shaped container filled with various drinks, a pharmaceutical, etc. by the bonding using this film 10 itself.
- the laser marking film 10 of the present invention can form a laser marking image for displaying various types of information very clearly, so that it is a bag for beverages or pharmaceuticals that require accurate information on the contents. It can be most suitably used as a container.
- a printed image for enhancing the decorating property is formed by ink jet printing or the like in a place other than the portion where the laser marking image is formed on the protective layer 7, and then laser marking.
- the ink layer 5 can be provided on the protective layer 7 and the underlying layer 3 can be provided so as to cover these printed images.
- Examples of the laser beam used for forming the laser marking image on the laser marking ink layer 5 described above include a YAG laser and a YVO4 laser.
- the YVO4 laser having a wavelength of 1064 nm is most preferably used from the viewpoint of cost and the like.
- the laser beam irradiation apparatus to be used can use what was conventionally used in this field as it is. [Experimental example]
- the invention is illustrated by the following experimental example.
- the evaluation of the marking image in the following experiments, the laser irradiation conditions employed for the laser marking, and the reddish brown iron oxide used are as follows.
- Laser beam irradiation device Keyence 3D YVO4 laser marker Irradiation laser wavelength: 1064 nm Laser output range: 35% to 50% at 50W
- Example 2 A film was prepared in the same manner as in Experimental Example 1 except that the laser mark ink did not contain titanium oxide, which was a white inorganic pigment, and the base layer was not formed, and was evaluated by irradiation with laser light. .
- Example 3 A film was prepared in the same manner as in Experimental Example 1 except that titanium oxide, a white inorganic pigment, was not included as the laser mark ink, and evaluation was performed by irradiating laser light.
- Example 4 A film was prepared in the same manner as in Experimental Example 1 except that the base layer was not formed, and evaluation was performed by irradiating a laser beam.
- Example 5 A film was prepared in the same manner as in Experimental Example 3 except that only a pearl pigment doped with various metals or metal oxides in mica of an inorganic pigment was used as the laser mark ink, and evaluation was performed by irradiating a laser beam.
- Example 6 A film was prepared in the same manner as in Experimental Example 4 except that yellow iron oxide was used in place of the red-brown iron oxide as the laser mark ink, and evaluation was performed by irradiating laser light.
- Example 7 A film was prepared in the same manner as in Experimental Example 4 except that black iron oxide was used in place of the red-brown iron oxide as the laser mark ink, and evaluation was performed by irradiating laser light.
- Base material 3 White underlayer 5: Ink layer for laser marking 7: Protective layer
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Abstract
Description
(1)前記インキ層には、さらに白色顔料が分散されていること、
(2)前記インキ層には、前記酸化鉄と白色顔料とが1:5乃至1:8000の重量比で分散されていること、
(3)前記酸化鉄が赤茶色酸化鉄であること、
(4)前記インキ層上に透明乃至半透明の保護層が形成されていること、
(5)包装体として使用すること、
が好ましい。
また、本発明のレーザーマーキングフィルムは、例えばパール顔料を用いてインキ層が形成されたものに比して、非常に安価であり、大幅なコストダウンを図ることができる。
さらに、特に種々の内容物が収容される包装体(例えばパウチなど)では、内容物についての正確な情報表示が要求される。従って、本発明のレーザーマーキングフィルムは、レーザー光を照射して種々の情報を表示するバーコードや文字像などを鮮明に形成することができるため、このような包装体としての用途に極めて有用である。
基材フィルム1としては、このレーザーマーキングフィルム10の使用形態に応じて、各種の紙、樹脂フィルム、樹脂コートされたアルミ箔等の金属箔等が使用されるが、一般的には、汎用性等の観点から樹脂フィルムが好適である。
また、樹脂フィルムの厚みは、その使用形態に応じて、適宜の範囲にあればよい。
白色の下地層3は、この上に形成されるインキ層5中のレーザー吸収による発熱を高めるために形成されるものである。このような下地層3を形成することにより、レーザーマーキングに際して、下地層3の表面で反射したレーザー光によってもインキ層5中の酸化鉄粒子がレーザー光を吸収して発熱するため、より鮮明なレーザーマーキング像を形成することができる。
前述した下地層3の上に形成されるレーザーマーキング用インキ層5には、既に述べた通り、酸化鉄がレーザー光吸収剤として樹脂バインダー中に配合されており、これにより、レーザーマーキング用のレーザー光をフィルム10に照射したとき、レーザー光照射部分で酸化鉄が該レーザー光を吸収して発熱して樹脂の炭化を生じ、この炭化による黒色化によってレーザーマーキング像がインキ層5に形成されることとなる。
前記インキ層5の上に形成される保護層7は、インキ層5に形成されるレーザーマーキング像等を保護するために必要により設けられるものであり、レーザーマーキングに使用されるレーザー光を透過し且つ半透明乃至透明の樹脂により形成される。
前述した層構造を有するレーザーマーキング用フィルム10は、レーザーマーキング用インキ層5の形成用インキ及び下地層3の形成用インキを使用して前述した保護層7の上にインキ層5及び下地層3を順次形成した後、接着剤(図示せず)を介して基材フィルム1と貼り合わせることにより製造される。
前記のようにして形成されるレーザーマーキングフィルム10は、保護層7を介してのレーザー光の照射により鮮明なレーザーマーキング像をインキ層5に形成し得るため、種々の用途に供することができる。
特に、本発明のレーザーマーキングフィルム10は、各種の情報を表示するレーザーマーキング像を極めて鮮明に形成することができるため、内容物の正確な情報が要求される飲料用或いは医薬品用などの袋状容器として最も好適に使用することができる。
また、用いるレーザー光照射装置は、この分野で従来から使用されているものをそのまま使用することができる。
[実験例]
尚、以下の実験におけるマーキング像の評価やレーザーマーキングに採用したレーザー照射条件、用いた赤茶色酸化鉄は、以下の通りである。
レーザー照射後のレーザーマーク用インキの鮮明さを目視で確認した。評価基準は、以下の通りである。
◎:極めて鮮明
○:鮮明
△:やや不鮮明
×:不鮮明
レーザー光照射装置:キーエンス社製 3次元YVO4レーザーマー
カー
照射レーザー波長:1064nm
レーザー出力範囲:50Wにて35%~50%
赤茶色酸化鉄(α-Fe2O3)、粒径:1~2μm
樹脂バインダーとしてウレタン系樹脂、無機顔料としてベンガラから成る赤茶色酸化鉄、白色無機顔料として酸化チタン、及び有機溶媒としてトルエン・MEK(メチルエチルケトン)・IPA(イソプロピルアルコール)を用い、レーザーマーク用インキを作成した。樹脂バインダー100重量部当たり赤茶色酸化鉄は3重量部、酸化チタンは810重量部の割合で用いた(即ち、赤茶色酸化鉄:酸化チタンの重量比は、1:270であった)。
次いで、ポリエチレンテレフタレートから成る厚み12μmの保護層上に、前記レーザーマーク用インキを印刷・乾燥させてインキ層を形成し、このインキ層上に白色無機顔料の酸化チタンを含有させたウレタン系樹脂から成る厚み3μmの下地層を形成した後、接着剤を介してポリプロピレンから成る厚み70μmの基材フィルムを貼り合わせ、保護フィルム側より前記条件でレーザー光を照射した。
評価した結果を表1に示す。
前記レーザーマーク用インキとして白色無機顔料の酸化チタンを含有させず、また、前記下地層を形成しなかった以外は、実験例1と同様にしてフィルムを作成し、レーザー光を照射して評価した。
前記レーザーマーク用インキとして白色無機顔料の酸化チタンを含有させなかった以外は、実験例1と同様にしてフィルムを作成し、レーザー光を照射して評価した。
前記下地層を形成しなかった以外は、実験例1と同様にしてフィルムを作成し、レーザー光を照射して評価した。
前記レーザーマーク用インキとして無機顔料の雲母に各種金属乃至金属酸化物をドープしたパール顔料のみを用いた以外は、実験例3と同様にしてフィルムを作成し、レーザー光を照射して評価した。
前記レーザーマーク用インキとして前記赤茶色酸化鉄に代えて黄色酸化鉄を用いた以外は、実験例4と同様にしてフィルムを作成し、レーザー光を照射して評価した。
前記レーザーマーク用インキとして前記赤茶色酸化鉄に代えて黒色酸化鉄を用いた以外は、実験例4と同様にしてフィルムを作成し、レーザー光を照射して評価した。
3:白色の下地層
5:レーザーマーキング用インキ層
7:保護層
Claims (6)
- 基材フィルムと、基材フィルム上に形成された白色の下地層と、該下地層上に形成されたレーザーマーキング用インキ層とを有しており、該レーザーマーキング用インキ層には、樹脂バインダー100重量部当り0.1乃至30重量部の量で酸化鉄がレーザー光吸収剤として分散されていることを特徴とするレーザーマーキングフィルム。
- 前記インキ層には、さらに白色顔料が分散されている請求項1記載のレーザーマーキングフィルム。
- 前記インキ層には、前記酸化鉄と白色顔料とが1:5乃至1:8000の重量比で分散されている請求項2に記載のレーザーマーキングフィルム。
- 前記酸化鉄が赤茶色酸化鉄である請求項1に記載のレーザーマーキングフィルム。
- 前記インキ層上に透明乃至半透明の保護層が形成されている請求項1に記載のレーザーマーキングフィルム。
- 請求項1に記載のレーザーマーキングフィルムからなる包装体。
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EP11806609.1A EP2594405B1 (en) | 2010-07-15 | 2011-06-23 | Laser marking film |
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JP2011545578A JP4905612B2 (ja) | 2010-07-15 | 2011-06-23 | レーザーマーキングフィルム |
US13/806,466 US8597774B2 (en) | 2010-07-15 | 2011-06-23 | Laser-marking film |
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