JPH09193050A - Laser marking-off method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a defect requiring much labor and time by spreading a fusible powder colored materials on a subject on which lines are drawn, and exposing the surface of the subject by laser light irradiation so that the powder colored materials are fused and stuck on the surface of the subject. SOLUTION: Powder colored materials are spread on a subject of marking-off and thermally fused. An optical unit 5 is movably arranged on a frame 4 composing the outer frame of a device main body. The optical unit 5 is fixedly formed on a moving plate 6, a female screw body 7 is fixed to the moving plate 6 and engaged with a male screw rod 9 rotated by a motor 8 attached on the frame 4. The moving plate 6 can be moved when the motor 8 is driven. A temperature regulator 10 is fixed to the moving plate 6, and the luminescent source 11 of a laser light source is loaded on the temperature regulator 10. Beams 12 from the luminescent source 11 are reflected by a polariscope 13, and an optical path is changed by a reflecting mirror 16. Therefore, the conventional defect requiring much labor and time can be solved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a laser optical system to expose desired points, lines, characters, and various images on the surface of a scoring object to which a fusible powder coloring material has been previously sprayed, and the exposed portion And a laser marking method for obtaining a fixed image of desired points, lines, characters, and various images on the object by melting and adhering the fusible powder coloring matter on the object, and an apparatus therefor. .

[0002]

2. Description of the Related Art Conventionally, a scoring process for forming desired dots, lines, characters, and various images on the surface of various shaped materials such as metals, resins, and ceramics is a secondary process for the materials. It is indispensable in order to improve the efficiency and accuracy of the machining work by giving information such as the machining position when performing the machining.

In particular, in fields such as shipbuilding and bridge construction where it is necessary to perform precision secondary processing using large-scale materials, not only the efficiency and accuracy of processing work are improved, but also the yield of materials is improved. However, the scoring process is very important.

However, conventionally, a hand-scoring method called a full-scale scoring method or a projection scoring method is generally used, and an electrophotographic scoring method is only partially used.

According to the current scale marking method, a front view of an actual size of a building,
The side view and the plan view are spread on a vast floor, and based on this, they are copied on a ruler type and taken to a scoring workshop to score them on the material. The ruler was made of square wood or still tape, so the work speed was low and the accuracy was insufficient.

The projection scoring method is 1 without expanding the original size drawing.
A method of projecting a scale drawing of / 5 to 1/10 on the material surface using a projector and tracing the bright lines of the image magnified to the actual size to draw a ruled line brought about a great improvement in workability and accuracy. However, it was not the one that wiped out the shortcomings of the current-scale scoring method in that it is a manual scoring method that relies on human power.

In the early electrophotographic scoring system, a sensitizer shop primer was applied on the surface of a conductive material, the coating was charged by corona discharge after drying, and an image was projected on this to form a latent image. In this method, a developer called toner is sprayed, the toner is removed from a portion without a latent image by an air knife or the like to form a toner image, and finally a solvent or heat is applied to fix the toner image on the material. Although the working speed and accuracy were further improved, it was a complicated method using an expensive photosensitizer shop primer.

In the more advanced electrophotographic scoring method, a photoconductive powder called a photoner is charged on the surface of a conductive material and then sprayed, and the photoner in the exposed portion is enlarged and projected from a scale drawing film to an air knife. And the like to form a visible image, and similarly a solvent or heat is applied to fix the photoner image. The work speed was improved, but the drawback of using an expensive photoner remained.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a new scoring method and an apparatus for the scoring method, which solves the drawback of the conventional scoring method, which requires much labor and time. is there.

Another object of the present invention is to provide an inexpensive scoring method and an apparatus therefor which do not use expensive consumables.

Another object of the present invention is to provide a scoring method and a device therefor with high precision and high material yield.

Another object of the present invention is to provide a scoring method and an apparatus for the scoring method, which provide uniform and high-resolution scoring image quality.

Still another object of the present invention is to provide a scoring method and an apparatus therefor which can be applied as it is to an insulating material without any preliminary processing.

Another object of the present invention is to provide a method for directly operating a scoring device with computer data such as drawing data created by CAD or the like, and a device therefor.

[0015]

As a result of intensive studies, the present inventors have found that the object of the present invention can be achieved by using the following method and apparatus.

(1) Dispersing a fusible powder coloring matter on a scribed object and exposing the object imagewise by laser light irradiation to melt-adhere the powder coloring matter on the surface of the object. Laser scoring method characterized by.

(2) The laser marking method according to claim 1, wherein the imagewise exposure with the laser light is performed by scanning the laser light.

(3) A means for spraying the meltable powder colored material on the scoring object, a laser light source and a laser beam scanning device are provided, and scanning is performed on the scoring object on which the fusible powder colored material is sprayed. A laser scoring device, characterized in that the powder colored material is melted and adhered to the surface of an object by exposure.

Method of the present invention and configuration of apparatus therefor The present invention uses a laser optical system to produce desired points, lines, characters, and various images on the surface of a marking object on which a fusible powder coloring matter has been previously sprayed. Laser marking method to obtain a fixed image of desired points, lines, characters, and various images on the object by melting and depositing this fusible powder coloring matter on the object at the exposed portion , And a device therefor.

Laser light source: In the present invention, after the fusible powder coloring matter is previously sprayed on the surface of the marking object, desired points, lines, characters and various images are formed on the surface of the object using the laser optical system. Is exposed, and the fusible powdered coloring matter is melted and adhered onto the object in the exposed portion. The laser optical system includes a laser light source and an exposure unit. Well-known laser light sources are solid-state lasers such as ruby laser, YAG laser, glass laser, He-Ne laser, Ar ion laser, Kr ion laser, CO ₂ laser, CO laser,
He-Cd laser, N ₂ laser, gas laser such as excimer laser, GaSb laser, InGaP laser, Al
A semiconductor laser such as a GaAs laser, a GaAsP laser, an InGaAs laser, an InAsP laser, a CdSnP ₂ laser, a chemical laser, a dye laser and the like can be mentioned. Of these, the oscillation wavelength is 400 to 1200 nm
In particular, those which are absorbed by the fusible powder colorant of the present invention and converted into heat energy are preferable for enhancing the recording sensitivity.

As will be described later, the laser light source output is 100 m.
Although W to 1 kW is used, laser light from a plurality of light sources can be collected and made to have a high output by using an optical fiber or a multiplexing optical system even with a lower output. Ruby laser, YAG laser, solid-state laser such as glass laser, He-Ne laser, Ar ion laser, Kr ion laser, CO ₂ laser, CO laser, H
Gas lasers such as an e-Cd laser, an N ₂ laser, and an excimer laser are easy to obtain a high output, and are suitable for forming an image on a large marking object at a high speed.
nGaP laser, AlGaAs laser, GaAsP laser, InGaAs laser, InAsP laser, CdSn
A semiconductor laser such as a P ₂ laser is suitable for downsizing the device of the scoring system.

Exposing means: In the present invention, the surface of the marking object can be exposed by various methods using the above-mentioned laser light source, but various driving devices that linearly move along guides such as rails, so-called fθ. It is particularly preferable to expose the surface of the scoring object by scanning the laser beam with a polygonal device with a combination of lenses, a galvanometer type optical scanner with a combination of so-called fθ lenses or the like alone or in combination. The laser light beam may be modulated according to desired image information. Usually, the image to be formed on the surface of the scoring object has a small area compared to the total surface area of the object. Therefore, so-called positive exposure in which only the portion corresponding to the desired image is exposed is a fusible powder coloring matter. Although the required amount is small and preferable, negative exposure can also be used when the image to be formed has a relatively large area.

Particularly when the image to be scored is present as computer data such as created by CAD, the laser light beam is directly modulated and scanned by using this computer data to improve the efficiency of the score marking operation. Can be significantly improved.

In particular, in order to carry out scoring for a large area, a light source and a polygon device, or the entire galvanometer type optical scanner is guided by the surface of a scoring object while micro-scanning a minute range by a polygon device or a galvanometer type optical scanner. A compound scanning method of macro-moving along with macro-scanning is particularly suitable.

The laser light source used in such a scanning exposure system has an output range of 100 mW to 1 kW, and a maximum spot diameter on the surface of the scoring object is 5 μm to 10 mm, and 0.1 cm ² / sec to 10 m ² Irradiation is performed at an area exposure speed of / sec, but sufficient scoring resolution and scoring speed can be obtained, and ordinary fusible powder coloring matter is sufficiently melted and fixed on the surface of the object, and also overheated. 1 cm ² / sec to 1 m ² / sec of 1W to 500W light source for thermal decomposition of the fusible powder coloring matter does not harm by
It is preferable to irradiate with a spot maximum diameter of 50 μm to 2 mm at an area exposure speed of 1 to 2.

The laser used here is used in a so-called heat mode. When the meltable powder colored material directly absorbs laser light and is heated and melted to be fixed, and when the marking object is a laser. If the fusible powder colorant is indirectly heated and melted by absorbing light, both of these processes may occur in parallel.

Development Step In the present invention, a fixed image of desired points, lines, characters, and various images is obtained by exposure using a laser optical system as described above. When the unfixed meltable powder coloring matter is removed from the surface of the marking object, the marking image becomes visible. The unfixed fusible powder coloring matter is naturally removed from the surface without any special removal process, but in order to check the scoring results within a short time and to keep the work site clean. Immediately after the exposure, the non-fixed meltable powder colored material is removed from the surface of the scoring object by using a non-contact means such as an air knife or vacuum suction, or a contact means such as a rubber blade or a fur brush. Good to do. Collecting the removed meltable powder coloring matter at a certain place can prevent contamination of the surrounding area due to scattering.

Scoring Object According to the Present Invention The scoring technique of the present invention can be freely applied to scoring objects of various materials. That is, it is particularly advantageously applied to various metals, resins, ceramics and the like.

As the metal material to be the marking object of the present invention, magnesium, aluminum, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper,
Zinc, molybdenum, palladium, silver, indium, tin,
Examples include simple substances such as tungsten, iridium, platinum, gold, lead and bismuth, and alloys thereof.

Various thermoplastic resins or thermosetting resins can be cited as the resin material to be the marking object of the present invention.

As the thermoplastic resin, a so-called general-purpose resin,
There are various crystalline or amorphous polymer substances belonging to the category called engineering plastics and super engineering plastics. Among them, thermoplastic resins classified as general-purpose resins include polyethylene, polypropylene (above crystalline), Examples thereof include homopolymers and copolymers of polyvinyl chloride, polystyrene, ABS resin, AS resin, methacrylic resin (above amorphous) and the like.

Thermoplastic resins classified as engineering plastics or super engineering plastics include ultra high molecular weight polyethylene, poly-4-methylpentene-1, nylon (nylon-6, nylon-66, nylon-11, nylon-12, etc.). ), Polyacetal, polybutylene terephthalate, polyethylene terephthalate, paraoxybenzoyl group-containing wholly aromatic polyester, polyphenylene sulfide, polyether ether ketone, polyamideimide (above crystalline), polyphenylene ether, polycarbonate, polyarylate (divalent phenol and aromatic) Polyester with dicarboxylic acid), polysulfone, polyether sulfone, polyetherimide (above amorphous) and the like.

A thermoplastic resin having a chemical structure which should be classified as a general-purpose plastic but exhibits physical properties comparable to those of engineering plastics, for example, syndiotactic polystyrene called metallocene polymerized polymer, metallocene polymerized polyethylene, isotactic polypropylene, syndiotactic. The technique of the present invention can be applied to tic polypropylene and the like.

In addition to the above, there is a fluorine resin as a material classified into the thermoplastic engineering plastic. As the fluororesin, polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, polychlorotrifluoroethylene, tetrafluoroethylene-ethylene copolymer, chlorotrifluoro Examples thereof include ethylene-ethylene copolymer, polyvinylidene fluoride and polyvinyl fluoride.

The thermosetting resin includes unsaturated polyester resin, epoxy resin, vinyl ester resin, phenol resin, thermosetting polyimide resin, thermosetting polyamide-imide, etc., and the unsaturated polyester resin includes orthophthalic acid resin, Isophthalic acid-based resin, terephthalic acid-based resin, bisphenol-based resin, propylene glycol-maleic acid-based resin, dicyclopentadiene or a derivative thereof is introduced into an unsaturated polyester composition to reduce the molecular weight or form a film-forming wax compound. Low styrene volatile resin added, low shrinkage resin added thermoplastic resin (polyvinyl acetate resin, styrene-butadiene copolymer, polystyrene, saturated polyester, etc.), unsaturated polyester is directly brominated with Br ₂ ,
Alternatively, a reactive type obtained by copolymerizing het acid, dibromoneopentyl glycol, chlorinated paraffin,
Addition-type flame-retardant resin that uses a combination of halides such as tetrabromobisphenol and antimony trioxide, phosphorus compounds and aluminum hydroxide as an additive,
Hybridized with polyurethane or silicone, or I
Examples include PN-made tough resins (high strength, high elastic modulus, high elongation) and the like.

Bisphenol A as an epoxy resin
Type, novolac phenol type, bisphenol F type, brominated bisphenol A type glycidyl ether type epoxy resin, glycidyl amine type, glycidyl ester type, cycloaliphatic type, special epoxy resin including heterocyclic epoxy type, etc. Can be done.

The vinyl ester resin is usually an oligomer obtained by ring-opening addition reaction of an epoxy resin and an unsaturated monobasic acid such as methacrylic acid dissolved in a monomer such as styrene. In addition, there is also a special type that has a vinyl group at the terminal or side chain of the molecule and contains a vinyl monomer. There are bisphenol-based, novolak-based, brominated bisphenol-based, etc. as vinyl ester resins of glycidyl ether-based epoxy resins, and vinyl ester urethane-based, isocyanurate vinyl-based, side chain vinyl ester-based etc. as special vinyl ester resins. Can be done.

The phenol resin is obtained by polycondensation of phenols and formaldehydes as raw materials, and there are a resol type and a novolak type.

Examples of the thermosetting polyimide resin include maleic acid type polyimides such as polymaleimidoamine, polyaminobismaleimide, bismaleimide.o, o'-diallylbisphenol-A resin, bismaleimide.triazine resin, and nadic acid-modified polyimide. And acetylene-terminated polyimide.

The ceramic material to be the marking object of the present invention is Al ₂ O ₃ (alumina), MgO.Al ₂ O ₃
(Spinel), 3Al ₂ O ₃ .2Si ₂ O ₃ (mullite),
Al ₂ O ₃ -ZrO ₂ (zirconia), Si ₃ N _4, Si
C, ZrO ₂ , Al ₂ TiO ₂ , PSZ, cordierite, tricalcium phosphate, hydroxyapatite, tricalcium phosphate-zirconia, hydroxyapatite-zirconia,
Mullite-zirconia, SiC-TiC (conductive), S
i-C-N (containing Y ₂ O ₃ -Al ₂ O ₃ as a normal sintering _{aid), Al 2 O 3 -La 2} O 3, Al 2 O 3 -TiO
Various oxide-based, non-oxide-based, and mixed-system inorganic substances such as ₂ (Na) and TiC-ZrO ₂ can be used.

The scoring technique of the present invention can be freely applied to scoring objects having various three-dimensional shapes such as a plate shape and a film shape. However, particularly advantageously applied objects are plate-like objects having a size of several square meters or more.

Composition of Meltable Powder Colored Material The meltable powder colored material of the present invention comprises at least a resin and a colorant.

As the resin used for the meltable powder colored product of the present invention, all thermoplastic resins can be used.

As the thermoplastic resin, various crystalline or amorphous polymer substances can be used. The thermoplastic resin here does not need to be thermoplastic in a strict sense, and the viscosity is reduced by heating with laser light,
Any material can be used as long as it maintains a low viscosity for a sufficient time for fixing, and may be heat-cured as a result by heating with a laser beam.

As the thermoplastic resin, polyethylene, ethylene copolymer, polypropylene, ethylene propylene rubber, polybutene, polyisobutylene, C ₅ , C ₆ olefin resin, petroleum resin, styrene resin, styrene-butadiene resin, Hydrocarbon type unsaturated polymerization type resins such as ABS resin, coumarone-indene resin, terpene resin and diene resin, acrylic resin and acrylic rubber, methacrylic resin, polyacrylonitrile, polycyanoacrylate, polyacrylamide and diacetone acrylamide, polyacrylic Acrylic acid unsaturated polymerization resins such as acids and salts thereof and polymethacrylic acid and salts thereof, vinyl acetate and vinyl alcohol unsaturated polymerization resins, polyvinyl ether unsaturated polymerization resins, vinyl chloride resins, salts Halogen-containing unsaturated polymerization resin such as vinylidene resin and fluorine resin, nitrogen-containing unsaturated polymerization resin such as polyvinylcarbazole, polyvinylpyrrolidone, polyvinylpyridine and polyvinylimidazole, and diene-based resin such as butadiene synthetic resin and isoprene synthetic resin Polymerization resins, polyoxymethylene, polyethylene oxides and glycols, polypropylene oxides and glycols, hydrin rubbers and polyether ring-opening polymerization resins such as tricyclic oxide polymers and penton resins,
Other ring-opening polymerization type resin, phenol-formalin resin, cresol formalin resin, modified phenol resin,
Phenolic resins such as phenol-furfural resin and resorcin resin, urea resins and modified urea resins, melamine resins, guanamine resins, amino resins such as aniline resins and sulfonamide resins, xylene resins, toluene resins and aromatic carbonization such as alkylbenzene resins. Hydrogen resin,
Polyester type resins such as ketone resin, saturated alkyd resin, unsaturated polyester resin, allyl ester resin, polycarbonate, polyphosphoric acid ester and polysulfonate and polysulfone, 6-nylon, 6,6-nylon, modified nylon and 6,10-nylon , Homonylon homologues, non-crystalline nylon, aromatic nylon, nitrogen-containing polyamides and polyimides, polyamino resins such as polymerized fatty acid polyamides and polyamino acids, silicone resins, furan resins, polyurethane resins, polyurea resins, epoxy resins, etc. To be

Among these, polyethylene, polypropylene, styrene resin, particularly styrene-acrylic copolymer, styrene-butadiene resin, acrylic resin and acrylic rubber, methacrylic resin, polyester type resin, epoxy resin and the like are particularly preferably used. Is.

As the colorant, various inorganic pigments and organic pigments can be used.

Carbon black is used as the achromatic colorant,
For example, channel black, furnace black, acetylene black, thermal black, lamp black, etc. are used. In addition, when adding magnetic particles such as iron oxides such as ferrite and magnetite or pure iron to the fusible powder colorant, these should fulfill their role without adding an achromatic colorant. There is also.

As the organic pigment, Madder Lake, Logwood Lake, Cochineal Lake, etc. can be used as natural products, and Naphthol Green B as a synthetic product,
Nitroso pigments such as Naphthol Green Y, naphthol yellow S, nitro pigments such as Resole Fast Yellow 2G, permanent red 4R, insoluble azo pigments such as Brilliant Fast Scarlet, Hansa Yellow, Benzidine Yellow, Resole Red, Lake Red C, Insoluble azo pigments such as lake red D, brilliant carmine 6B, permanent red F5R, pigment scarlet 3B, soluble azo pigments such as bordeaux 10B, phthalocyanine blue, phthalocyanine green, phthalocyanine pigments such as sky blue,
Basic dye pigments such as rhodamine lake, malachite green lake, methyl violet lake, acid dye pigments such as peacock blue lake, eosin lake, quinoline yellow lake, vat dye pigments such as indanthrene blue, thioindigo maroon A mordant dye pigment such as alizarin lake, quinacridone red, quinacridone violet, perylene red, perylene scarlet, isoindolinone yellow, dioxazine violet, aniline black, and organic fluorescent pigment can be used.

The colorant of the present invention is used in an amount of 0.5 to 60 parts by weight, preferably 3 to 35 parts by weight, based on 100 parts by weight of the resin.

It is particularly suitable for the purpose of the present invention that the volume average particle diameter of the fusible powder colorant of the present invention is 5 to 100 μm.

The fusible powder colored product of the present invention may have inorganic or organic fine particles having a number average primary particle diameter of 10 to 1000 nm measured by a transmission electron microscope according to a conventional method added to the surface thereof.

The meltable powder colored product of the present invention can be manufactured more easily and is less expensive than the photosensitizer shop primer and photoner used in the conventional marking method.

As a method for producing the meltable powder colored product, a method of mixing a colorant with a resin, dispersing and then pulverizing it, and optionally classifying the resin, the resin and the colorant are melt-mixed, and this molten mixture is prepared. A method of solidifying while atomizing by so-called spray drying method (spray solidification device), and a suspension or emulsion of resin component monomer or resin precursor (prepolymer) in the process of producing resin by polymerization reaction A so-called granulation polymerization method is used in which a colorant is mixed with and dispersed in a substance to cause a polymerization reaction, and a fusible powder colorant is obtained in the form of a suspension or an emulsion, which is then separated and dried. be able to.

To mix the colorant with the resin, for example, the colorant powder and the resin, and if necessary, the dispersant is melt-kneaded with a high shear mixer such as a roll or a kneader, the colorant pigment aqueous paste and the resin are mixed. It is possible to use a method in which water is removed after melt-kneading and the pigments of the aqueous phase are transferred to the resin phase, and for the pulverization of the colorant-resin mixed dispersion, an air flow type pulverizer, a mechanical pulverizer Well-known crushing means such as an impact crusher can be used.

[0056]

EXAMPLES The embodiments of the present invention will be described with reference to Examples, but the present invention is not limited thereto. In addition, "part" in the text
Represents "parts by weight".

In the embodiment of the present invention, the powder coloring matter is first sprayed on the marking object, and then the powder coloring matter is heat-sealed according to the marking image.

Next, the apparatus for heat fusion will be described with reference to FIG.
In FIG. 4, reference numeral 4 is a frame forming an outer frame of the apparatus main body. An optical unit 5 is movably provided on the frame 4. The entire optical unit 5 is fixed to the moving plate 6. A female screw body 7 is attached to the moving plate 6.
Is fixed, and this female screw body 7 is engaged with a male screw rod 9 rotated by a motor 8 attached to the frame 4. Therefore, the moving plate 6 drives the motor 8 to move the arrow Y
It can be moved in the opposite direction. The moving mechanism may be a wire, a roller, or the like, or may be configured to move on a rail, but a feed mechanism using a ball screw or a roller screw is more preferable.

An opening 4a is formed on the lower surface of the moving range of the moving body 6 in the frame 4. A temperature controller 10 is fixed on the moving plate 6, and a light source 11 of a laser light source (here, a semiconductor laser is used) is mounted on the temperature controller 10. This light source 1
The light beam 12 from 1 is passed through an optical system (not shown) such as a beam expander that shapes (expands) the beam diameter, and is transmitted by a polarizer 13 such as a galvanometer mirror or a polygon mirror (a galvanometer mirror is shown in FIG. 1). The reflected scanning light 14 becomes a fan-shaped scanning light 14, passes through a condenser lens 15 such as an fθ lens for focus adjustment, and the optical path is changed downward by a reflection mirror 16.

The laser light of the semiconductor laser which is the light emission source is
It is controlled by an image signal corresponding to the scored image. For example, when performing a positive exposure for exposing a portion corresponding to an image, a laser light may be controlled by providing a modulation element in the optical path.

The object 1 is fixed below the moving range of the scanning optical unit 5, that is, on the bottom portion 4b of the frame 4, and the laser beam 2 is scanned on the object 1 along the scanning line 3. .

In this apparatus, in the main scanning on the object 1 in the X direction, the light beam emitted from the light emitting source 11 is polarized by the polarizer 13.
It is shaken (scanned) by and is focused by the condenser lens 15 on the surface of the object 1.

On the other hand, the sub-scanning in the Y direction is performed by moving the moving plate 6 in the Y direction, that is, the scanning optical unit 5 itself while the object 1 is fixed in this example. In addition, the scoring target is large, and the light beam may not be able to be scanned in the X direction only by the pendulum. Therefore, in this embodiment, the main body 4 can be moved in the X direction by the roller 17 which is a moving means. The moving means moves the main body 4 by, for example, the scanning width in consideration of the scanning width of the light source. As the moving means, not only rollers but also known means such as those running on rails can be used.

Therefore, the object 1 can be two-dimensionally scanned with the laser light 2.

Example 1 A styrene acrylic resin was synthesized by solution polymerization of 70 parts of styrene and 30 parts of n-butyl acrylate, followed by drying. The synthesis conditions were controlled so that the weight average molecular weight (Mw) of this resin was 240000, the number average molecular weight (Mn) was 7,000, Mw / Mn was 34.1, the softening point was 125 ° C., and the glass transition temperature was 59 ° C.

C. as a colorant was added to 100 parts of this resin. I.
Pigment Blue 15: 3 (6 parts) were mixed, melt-kneaded with an extruder, and then pulverized with an airflow pulverizer. Then, by classification, the volume average particle size is 9.0.
A meltable powder colored product having a size of μm was obtained. 0.6% by weight of silica particles having a number average primary particle diameter of 12 nm, the surface of which was hydrophobized with dichlorodimethylsilane, was added to this meltable powder colored product, and mixed with a Turbula mixer.

50 g of the colored particles were sprayed with a spray gun 21 shown in FIG. 2 on a steel plate connected to a ground electrode of 2 m × 2 m and 5 mm thickness which was placed horizontally by applying a voltage of +12 kV DC to the tip electrode 22. did. Incidentally, 23 in FIG.
Is a mixture of particles and air, 24 is a spread range at the time of injection, and 25 is an adjusting knob for adjusting the spread range at the time of injection.

As a writing laser light source, a wavelength of 514.
A laser optical system combining 5 nm and 488 nm as main wavelengths and a 4 W Ar ion laser (GLG3460E manufactured by NEC, Inc.) with a galvanometer type optical scanner is placed on a stand that moves on a straight biaxial rail and placed on an iron plate. After positively exposing 144 points of Mincho characters at a beam diameter of 1 mm at 50 mm / sec, the unfixed powdered colored material was vacuumed and developed.

The obtained character image had few missing parts in the stroke and was uniform in density and clear.

Example 2 70 parts of terephthalic acid, 45 parts of ethylene glycol and 55 parts of neopentyl glycol were placed in a reactor equipped with a thermometer, a stirrer, a nitrogen introducing tube and a condenser, and heated in a nitrogen gas atmosphere. Then, a small amount of dibutyltin oxide was added and reacted at 200 ° C. The softening point of the resin was 128 ° C.

6 parts of carbon black (CB) as a colorant was mixed with 100 parts of this resin, melted and kneaded with an extruder, and then pulverized with an air flow type pulverizer. Then, classification was performed to obtain a fusible powder colored product having a volume average particle diameter of 10.0 μm. The number average primary particle diameter of the meltable powder colored product was made to be 17 n by hydrophobizing the surface with dichlorodimethylsilane.
0.1% by weight of silica particles of m was added and mixed with a turbuler mixer.

The colored particles were introduced into the electrostatic current immersion device 34 shown in FIG. 3 and sprayed on an alumina plate with a spray gun. That is, in FIG. 3, 31 is a high-pressure chamber, 32 is a negative corona discharge electrode, and 33 is a dispersion plate. With this, a cloud of powder particles charged with the air-laid particle layer 35 of the meltable powder coloring matter is charged. Set to 16.

FIG. 4 shows a state in which the powder cloud 36 is guided to the spray gun 21 and sprayed. One pole of the high voltage power source 37 is grounded and the other pole is connected to the spray gun 21 by a cable. This high voltage power supply is an electrostatic charge electrode (tip electrode) installed on the front of the gun.
This is for applying a voltage to the electrode 22. The position and structure of this electrode are configured so that the same sign as that of the electrode can be applied to the meltable powder colored material. Since the alumina plate 38 arranged facing the gun is grounded, it is kept at a potential having a sign opposite to that of the fusible powder coloring matter.
Therefore, the fusible powder coloring matter is attracted toward the alumina plate. Actually, an alumina plate with a size of 1 m x 1 m and a thickness of 3 mm is placed horizontally on a grounded iron plate of the same size,
Sprayed onto an alumina plate. In FIG. 4, 39 is an air flow sent to the high pressure chamber, and 40 is an air flow for sending the cloud of powder to the spray gun.

Subsequently, the same apparatus as in Example 1 was used to carry out laser exposure in the same manner, and then the unfixed fusible powder colorant was vacuum-sucked and developed. The character image was clearly readable and of high quality. was gotten.

[Example 3] 45 parts of terephthalic acid and 100 parts of polyoxypropylene (2,2) -2,2-bis (4-hydroxyphenyl) propane were provided with a thermometer, a stirrer, a nitrogen introducing tube and a condenser. The mixture was charged into a reactor, heated under a nitrogen gas atmosphere, a small amount of dibutyltin oxide was further added, and the mixture was reacted at 200 ° C. The softening point of the resin was 128 ° C.

6 parts of carbon black (CB) as a colorant was mixed with 100 parts of this resin, melted and kneaded in an extruder, and then pulverized by an air flow type pulverizer. Then, classification was performed to obtain a meltable powder colored product having a volume average particle size of 11.0 μm. The number average primary particle diameter of the meltable powder colored product was made to be 17 n by hydrophobizing the surface with dichlorodimethylsilane.
0.4% by weight of silica particles of m was added and mixed with a turbuler mixer.

A 100-mesh pass 20 was used by using a 200-mesh sieve made of steel wire from the upper side 1 m away from an iron plate connected horizontally to a ground electrode having a thickness of 2 m × 2 m and a thickness of 5 mm.
Spherical iron powder DSP138 (manufactured by Dowa Iron Powder Co., Ltd.) having a particle size of 0 mesh on and 10% by weight of the above meltable powder coloring matter are sieved and 40 g of the melting powder coloring matter is sprayed. did. Exposure and development were carried out in the same manner as in Example 1 to obtain a character image.
The resulting character image had few missing parts in the character image, was uniform in density, and was clear.

[0078]

According to the present invention, it is possible to provide a new scoring method and an apparatus for the scoring method, which solves the drawback of the conventional scoring method which requires much labor and time.

[Brief description of the drawings]

FIG. 1 is a perspective view of an optical system according to the present invention.

FIG. 2 is a schematic sectional view of a spray gun according to the present invention.

FIG. 3 is a schematic sectional view of an electrostatic current immersion device according to the present invention.

FIG. 4 is a schematic sectional view of a fusible powder coloring matter spray device according to the present invention.

[Explanation of symbols]

 1 Object 2 Laser Light 16 Reflecting Mirror 21 Spray Gun 22 Electrostatic Charge Electrode (Pointed Electrode) 23 Mixture of Particles and Air 34 Electrostatic Current Immersion Device 35 Elaid Particle Layer 37 High Voltage Power Supply

Claims (3)

[Claims] 1. A method of spraying a fusible powder coloring matter on a scribed object and exposing the object imagewise by laser light irradiation to melt-adhere the powder coloring matter to the surface of the object. The characteristic laser marking method. 2. The laser marking method according to claim 1, wherein the imagewise exposure with the laser light is performed by scanning the laser light. 3. A means for spraying a meltable powder coloring matter on a marking object, a laser light source and a laser beam scanning device, and scanning exposure on the marking object on which the melting powder coloring matter is scattered. Then, the laser marking device is characterized in that the powder coloring matter is melted and adhered to the surface of the object.