JP2010247406A - Resin screen printing plate and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a pattern (e.g., a print character, a design) having good printing reproducibility in terms of thin line, on a resin screen printing plate with a laser beam with hardly affecting a resin screen gauze used for the formation of the pattern. <P>SOLUTION: A specific polymer film is used as a polymer film to be laminated on, or to be taken in the resin screen gauze, then, irrespective of the use of the resin screen gauze, the screen printing plate can be manufactured without causing the substantial damage of the gauze with the laser irradiation, accordingly, the resin screen printing plate having improved printing reproducibility in terms of thin line can be obtained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a resin screen printing plate, a method for producing a resin screen printing plate, and a screen printing plate and a plate making method using the resin screen printing plate. More specifically, the present invention relates to a resin screen printing plate for laser plate making comprising a resin screen cage made of polyester, polyamide or the like and a polymer film, a method for producing the same, and screen printing produced using the resin screen printing plate. The present invention relates to a plate and a laser plate making method.

  Screen printing is a type of stencil printing, and is a printing method in which a plate film is brought into close contact with a wrinkle stretched around a frame, and ink is passed through the opening of the wrinkle to transfer it to a printed material. It is a printing method that can be printed regardless of thickness, size, plane, and curved surface of printed matter, and can be printed on various materials such as paper, cloth, resin, metal, etc. Furthermore, a thick ink deposit layer is formed. It is known as a printing method that can Screen printing plate making methods are roughly classified into (1) direct method plate making and (2) indirect method plate making (see Non-Patent Documents 1 to 3).

  In direct method plate making, a photosensitive solution (emulsion) is applied onto a screen mesh with a bucket or coated with a coating machine to form a photosensitive film, and then exposed through a positive film or negative film that is the original image to cure the photosensitive film. The screen printing plate having the pattern of the original image is produced by washing and removing the uncured portion with a solvent or the like. However, in this direct method plate making, since plate making is required, preparation of an original image, exposure and development steps are required, which is problematic in productivity, requires skill, and further costs for chemicals used in the development step. In addition, in order not to cause environmental problems due to the chemicals used, these waste liquid treatments are also required. In addition, there is a problem that a resin or monomer that is not UV-cured cannot be used, and further, exposure and development are performed under the presence of wrinkles. There are also problems such as the generation of moire due to interference between the positive and negative.

  Indirect plate making is a method in which an image is formed using a photosensitive film separately from a framed screen, and this is transferred to a screen, and is also called a transfer method. Indirect method plate making has a uniform photosensitive film thickness compared to direct method plate making, and there is no wrinkle interference between exposure and washing development, and a sharp image can be obtained, but the plate film is thin and easily damaged physically. Also, it is not suitable for thick film printing, and there is a problem that the number of printed sheets is small.

  In addition, direct method plate making combining direct method plate making and indirect method plate making has been devised. This plate making is carried out by making use of the emulsion of the direct method plate making, applying the photosensitive layer of the photosensitive film coated on the film to a ridge with water or a solvent, removing the film after drying, and then making the plate by exposure. Is the method. This method is also called a direct film method, and is sometimes classified as a kind of direct method plate making. However, like direct method plate making, there are problems of exposure and development, and consideration of the environment and the like.

  Unlike the conventional screen printing plate making method as described above, a screen plate making method is also proposed in which a laser beam is selectively irradiated to a plate material to selectively open holes and a pattern formed by these holes is used as a plate. ing. For example, after a metal foil that has been opened in a pattern by some means is bonded to a metal screen via an adhesive, laser light is irradiated from the surface on the metal foil side to bond the pattern portion (opening) of the metal foil. A method of producing a screen printing plate by evaporating and removing the agent (Patent Document 1), coating the openings of the screen in which openings are regularly formed on a metal foil with lacquer, filling the openings with lacquer, and irradiating with laser light The method of manufacturing a screen printing plate by removing the lacquer of the opening through which ink should pass (Patent Document 2), laminating a sheet of polymer having a glass transition point of 100 ° C. or more on a metal screen, and having a wavelength of A method of producing a screen printing plate by irradiating a laser beam of 150 to 400 nm to decompose a high molecular weight material into a low molecular weight material and scatter it (Patent Document 3), a metal screen A coating film is formed by applying a resin liquid containing 0.1% by mass or more of carbon black and increasing the absorbance at the oscillation wavelength of the laser beam, and irradiating the resin coating film with the laser beam. (Patent Document 4) for producing a screen printing plate by applying a laser beam to a laminate in which a polymer film layer is bonded to a metal screen mesh layer with an adhesive, thereby forming an opening in the polymer film layer. A method for producing a screen printing plate by removing the adhesive layer by chemical treatment (Patent Document 5) is known.

  Method of forming a screen printing plate by irradiating a resin film of a screen printing plate (plate material before plate making) with a predetermined pattern with laser light to thermally erase the resin film to form an opening of the predetermined pattern (this specification) Then, this is referred to as “laser screen plate making method”), such as the production of a pattern mask and the removal (development) of uncured portions of the photoresist, which are required when using a photosensitive film as a screen printing plate Since no work is required, improvement in productivity can be expected. However, in the method described in Patent Document 1, when a patterned metal foil corresponding to a conventional photomask is required, a process such as photoetching is necessary. There is also a need to consider the environment. Moreover, in the method of patent document 2, it is required to use metal foil, such as a cylindrical nickel sleeve, as a screen. Further, in the methods of Patent Documents 1, 3, 4, and 5, it is necessary to use a metal screen ridge, and it is impossible to produce a screen printing plate using a resin screen ridge that has been widely used in general. Since the obtained screen printing plate is a metal screen, it has a printing accuracy in flat printing, but is inflexible and has a problem of poor curved surface printability. Further, in the method of the cited document 3, it is not generally used as a laser irradiation device such as YAG or a carbon dioxide laser, and a special laser irradiation device is required. In the method, there is a problem that the adhesive layer in the opening must be removed by chemical treatment after laser light irradiation.

What is widely used as stencil printing, not screen printing, is called thermal stencil printing, and as a stencil, a thermal stencil printing film that opens ink passage holes and Japanese paper for reinforcement are used with an adhesive. The structure is simply bonded (Non-Patent Documents 4 and 5).
However, it has a structure in which the smoothness of the film is affected by the unevenness of the Japanese paper fiber at the time of bonding, and the interposition of the Japanese paper fiber or the adhesive on the adhesive surface with the film is not avoided (Non-patent Document) 4, 5).

  In order to avoid this, the polymer film and a porous support such as a synthetic paper such as a nonwoven fabric are laminated so as to maintain smoothness and improve printability (for example, Patent Documents 6 to 16). In heat-sensitive stencil printing, a thermal head or the like is used to heat and melt a heat-sensitive stencil printing film, which is a polymer film and a thermoplastic resin, in order to make holes through which ink passes. Since the plate making is performed by heat, the influence of heat is exerted on the surroundings, so that the fine line reproducibility in printing is poor.

  In order to improve this, a method using a xenon flash has been devised, but it is still inferior in fine line reproducibility (Patent Document 17).

  The plate used in the future heat-sensitive stencil printing is insufficient as a screen printing plate targeted by the present invention, and has a low durability printability.

JP 54-8003 A Japanese Unexamined Patent Publication No. 64-82945 Japanese Patent Laid-Open No. 3-72364 JP 2002-67527 A Japanese Patent Laid-Open No. 11-77948 Japanese Patent Application Laid-Open No. 07-205564 JP 07-237368 A Japanese Patent Laid-Open No. 08-67081 Japanese Patent Laid-Open No. 08-67082 Japanese Patent Laid-Open No. 10-193826 JP-A-11-198557 Japanese Patent Laid-Open No. 11-235484 JP 2000-94852 A JP 2000-318337 A JP 2000-85258 A JP 2000-85257 A JP 2000-198279 A

"Extended edition printing encyclopedia" June 30, 1987, first edition, first edition, edited by The Japan Printing Association, Printing Foundation Chaoyangkai “Special Printing and Converting”, published on March 29, 1990, by Masayoshi Araki, publisher, Processing Technology Study Group "Special printing" first edition issued on July 15, 1983, supervisor Kazuo Matsumoto, author Kazuo Matsumoto, publisher Mamoru Joshiro, publisher, Printing Publishing Research Institute, Inc. Hideyuki Yamaguchi and nine others, “Office Press Printer Satelio A400”, Ricoh Technical Report No. 29, December 2003, pages 136-141 Masayuki Ota, 4 others, “Development of a new stencil master for stencil printing”, Ricoh Technical Report No.31, December 2005, pages 139-143

  Conventionally, a screen made of a metal such as silk, polyester, nylon, stainless steel or the like is known as a screen paper for a screen printing plate. As described above, in the conventionally proposed laser screen plate making method, a metal ridge is used as the ridge. This is due to the fact that polyester and nylon rivets are less susceptible to heat than metal ridges, and burnt out or melts during laser plate making. However, most of the screen printing plates currently used are polyester cocoons or nylon cocoons, and metal screens such as stainless steel cocoons are limited to a limited field, for example, the printing field of electronic circuits such as thick film IC circuits. Yes. Resin screens such as polyester screens and nylon screens are advantageous in that they are less expensive than stainless steel screens, have excellent elastic recovery, and are relatively easy to handle during printing. Therefore, if laser plate making can be used in screen plate making using a resin screen cage, it is possible to simplify the plate making of a printing plate used in normal screen printing, and to produce a printing plate at low cost without causing environmental problems. Since there is a merit, a laser plate making method and a screen printing plate material using a resin screen are required.

  The present invention has been made in view of such conventional problems and demands. By forming a resin coating on the resin screen 紗 and irradiating the coating with laser light, the resin screen 紗 is substantially damaged. It is an object of the present invention to provide a resin screen printing plate capable of forming openings of desired patterns (printing characters, designs, etc.) by evaporating, scattering, or erasing only a polymer film without giving a film.

  The present invention also provides a method for producing the resin screen printing plate, a screen printing plate formed using the resin screen printing plate, and a method for making a laser plate using the resin screen printing plate. It is the purpose.

  As a result of intensive studies to solve the above problems, the present inventors have used a specific film as a polymer film for laminating or taking in the resin screen 、, even though the resin screen 紗 is used. The present invention has been made by finding that a resin screen printing plate having excellent fine line printing reproducibility can be obtained by producing a screen printing plate without substantial wrinkle damage by laser irradiation.

  That is, the present invention includes the following resin screen printing plate for laser plate making, a method for producing the resin screen printing plate for laser plate making, a resin screen printing plate formed using the resin screen printing plate for laser plate making, and the laser The present invention relates to a method for producing a screen printing plate using a resin screen printing plate for plate making.

(1) A resin screen printing plate for laser plate making, wherein the resin screen is heat-sealed to a polymer film.

(2) The resin screen printing plate for laser plate making as described in (1) above, wherein the heat fusion is performed by embedding a resin screen ridge at the time of polymer film injection molding.

(3) The resin screen printing plate for laser plate making as described in (1) or (2) above, wherein the polymer film contains carbon black.

(4) The resin screen printing plate for laser plate making according to any one of the above (1) to (3), wherein the resin screen screen is a screen screen made of nylon or polyester.

(5) A method for producing a resin screen printing plate for laser plate making, comprising heating a polymer film and thermally fusing it to a resin screen.

(6) A method for producing a resin screen printing plate for laser plate making, wherein a resin screen wrinkle is present at the time of polymer film injection molding, and the resin screen wrinkle is embedded in the polymer film.

(7) A resin screen printing plate obtained by irradiating the resin screen printing plate according to any one of (1) to (4) with a laser beam to form a predetermined pattern of openings in a polymer film.

(8) A method for producing a screen printing plate, comprising irradiating the resin screen printing plate according to any one of (1) to (4) with a laser beam.

(9) The method for producing a screen printing plate as described in (8) above, wherein the irradiation with the laser beam is performed from the opposite side to which the screen ink is supplied during printing.

  According to the present invention, by irradiating the resin screen printing plate for laser plate making composed of a polymer film and a resin screen with laser light, the resin screen is not damaged practically and only the polymer film is evaporated or evaporated. Since it is possible to produce a resin screen printing plate by erasing and removing, it is necessary to produce a negative or positive manuscript, which is conventionally required when producing a screen printing plate, and to expose and develop a photosensitive film. Therefore, a screen printing plate using a resin screen can be easily and efficiently produced without requiring a skilled person. In addition, since no developer is used, a screen printing plate can be produced without any problem of environmental pollution due to the developer, which can contribute to further quality improvement and productivity improvement of the screen printing plate.

  Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 to 4, but the drawings are used for the sake of explanation, and the embodiment of the present invention is not limited to the illustrated ones. Absent.

FIG. 1 is a diagram schematically showing a partially enlarged cross section of a resin screen printing plate in which the resin screen ridge in the present invention is heat-sealed to a polymer film,
FIG. 2 schematically shows a partially enlarged cross-section of a resin screen printing plate in which an opening is formed by irradiating a resin screen printing plate in which the resin screen plate in the present invention is thermally fused to a polymer film with laser light. It is a figure,
FIG. 3 is a diagram schematically showing a partially enlarged cross section of a resin screen printing plate in which the resin screen ridge in the present invention is embedded in a polymer film,
FIG. 4 schematically shows a partially enlarged cross section of a resin screen printing plate in which an opening is formed by irradiating the resin screen printing plate embedded in a polymer film with a laser beam. FIG.

  In FIG. 1 or FIG. 3, 1 is a resin screen printing plate, 2 is a resin screen ridge, and 3 is a polymer film. The resin screen printing plate 1 is formed as follows.

  In FIG. 1, a polymer film is thermally fused and laminated on a resin screen 、, particularly when the polymer film is not in a molten state when brought into contact with the resin screen 紗. The bag is in a state of being thermocompression bonded. In addition, as shown in FIG. 3, when the polymer film is in a molten state, the resin screen can be formed in a state of being embedded in the polymer film.

  As a method of laminating the polymer film with the resin screen こ の in this way, for example, the resin screen 紗 is supplied to a laminator, and the resin screen 紗 and the molten or unmelted polymer film are overlapped, and an elastic roll and a metal The resin screen ridge and the polymer film can be laminated by clamping with a roll. In this case, when the polymer film is in a molten state, the resin screen is formed in a state embedded in the polymer film as shown in FIG. 3, and when it is not in the molten state, the resin screen is laminated on the polymer film as shown in FIG. Formed as described.

FIG. 1 shows a case where a polymer film is laminated only on one side. When polymer films are laminated on both sides, the resin film is made into a core material by laminating a polymer film on the other side in the same manner. As a sandwich structure in which polymer film layers are laminated on both sides.
.

  As the number of meshes of the resin screen to be used, a conventionally known number of meshes may be used according to the resolution required for the printed figure, the ink to be used, and the printing target.

  In the polymer film (layer) used in the present invention, carbon black is incorporated for the purpose of efficiently absorbing laser light and avoiding the influence of the laser light on the resin screen wrinkles as much as possible. In the present invention, if the carbon black is too small, it is not possible to efficiently absorb the laser beam. Therefore, it is preferably 0.3% by weight or more of the total amount of the polymer film (layer), more preferably 1% by weight. % Or more, and more preferably 3% by weight or more. Also, if the content is too high, the visibility of the printing surface of the resin screen printing plate will be poor, and the resin screen will be damaged by the influence of heat from the laser beam, so the total amount of polymer film (layer) Is preferably 20% by weight or less, more preferably 10% by weight or less.

  The carbon black used in the present invention is not particularly limited by the type and production history, and various types such as commercially available oil furnace black, gas furnace black, thermal black, acetylene black, and channel black can be used. . Further, carbon black that has been subjected to treatment such as ozone treatment, plasma treatment, or liquid phase oxidation treatment that is usually performed may be used.

The particle size of the carbon black to be used is preferably 0.01 to 1 μm, and particularly preferably 0.01 to 0.2 μm, in the same manner as the particle size range of carbon black used for ordinary inks and paints. However, in the present invention, the particle diameter means an average primary particle diameter measured with a scanning electron microscope. As the dibutyl phthalate (DBP) oil absorption is preferably 80~120 (cm ³ / 100g), as the nitrogen adsorption specific surface area, 60~130 (m ² / g) are preferable.

  However, in the present invention, the particle diameter means an average primary particle system measured with a scanning electron microscope, and the DBP oil absorption amount and the nitrogen adsorption specific surface area are both measured according to JIS K6217. These physical property values are generally used to represent the physical characteristics of carbon black.

  Examples of the polymer film used in the present invention include polyethylene terephthalate (PET), polyvinyl chloride, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer synthetic resin (ABS resin), nylon, polycarbonate, cellophane, polyvinyl alcohol, poly Examples thereof include vinylidene chloride, polyacetate, polystyrene film, acrylic resin, heat resistant engineering plastic resin, and fluorine resin.

  Of these, a thermoplastic resin is preferable for laminating or embedding the resin screen by heat lamination, and polyethylene terephthalate (PET), polyvinyl chloride, polyethylene, polypropylene and nylon are particularly preferable.

The thickness of the film is about 5 to 40 μm, more preferably 5 to 20 μm. The polymer film preferably contains carbon black. In addition, when carbon black is contained, the content is preferably 0.1 to 20%, and preferably 1 to 5%.
In the present invention, in the case of FIG. 3 where the polymer film is melted and formed, it may be a chip, bead, or powder that is not a film.

  In the present invention, when the thermal lamination is performed, it is possible to perform some surface treatment on the surface of the polymer film for the purpose of improving the adhesion with the resin screen. When the adhesiveness with the resin screen is improved, the edge of the resin coating film is less damaged at the time of laser plate making, and a resin screen printing plate excellent in fine line printing reproducibility can be obtained.

Examples of the surface treatment of the polymer film include the following methods.
i) A method of treating the surface of a polymer film by applying a primer.
ii) A method of performing surface treatment of a polymer film by performing ionizing radiation.
iii) A method using i) and ii) in combination.

  As the method of iii), the method of applying the primer of the above i) after the surface treatment of the polymer film in the above ii), or the ionizing radiation after applying the primer of the above i) And a method of performing surface treatment of the primer itself.

  Examples of the resin component of the primer include water-soluble cellulose, methylcellulose, methoxycellulose, hydroxyethylcellulose, carboxymethylcellulose, polyvinyl alcohol, polyacrylamide, polyacrylic acid, casein, gelatin, styrene / maleic anhydride copolymer salt, isobutylene. / Maleic anhydride copolymer salt, polyacrylic acid ester, polyurethane resin, acrylic / styrene resin and the like. Solvent type resins include styrene / maleic acid, acrylic / styrene resin, polystyrene, polyester, polycarbonate, epoxy resin, polyurethane resin, polybutyral resin, polyacrylate ester, styrene / butadiene copolymer, styrene / butadiene / acrylic acid copolymer Examples thereof include a polymer and polyvinyl acetate. These resins can be obtained singly or by mixing two or more. To this resin component, water or a solvent, an additive, a pigment component such as carbon black can be appropriately added. As the solvent, the above-mentioned solvents can be used.

  Further, as the resin component of the primer, an active energy ray curable resin or the like can be used. Specifically, unsaturated polyester resins, acrylate resins, polyene / polythiol resins, spirane resins, epoxy resins, amino alkyd resins, diallyl phthalate resins, unsaturated polyester resins, furan resins, etc. Can be mentioned. These resins and various monomers such as active energy ray-curable monomers, prepolymers, and photopolymerization initiators are used as necessary.

  Examples of the active energy rays include electron beams and ultraviolet rays. In the present invention, ultraviolet rays are mainly used.

  As monomers that can be used for the primer, N-vinylpyrrolidone, acrylonitrile, styrene, acrylamide, 2-ethylhexyl acrylate, 2-hydroxy (meth) acrylate, 2-hydroxypropyl (meth) acrylate, tetrahydrofurfuryl acrylate, phenoxyethyl acrylate , Nonylphenoxyethyl acrylate, butoxyethyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl acrylate, cyclohexyl (meth) acrylate, N, N-dimethylamino (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate Monofunctional monomers such as ethyl, 3-phenoxypropyl acrylate, 2-methoxyethyl (meth) acrylate, ethylene glycol diacrylate Diethylene glycol diacrylate, polypropylene glycol diacrylate, neopentyl glycol diacrylate, tetraethylene glycol diacrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,12 -Bifunctional monomers such as dodecanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethyloloctane tri (meth) acrylate, trimethylolpropane polyethoxytri (meth) acrylate, pentaerythritol tri (meth) acrylate Tetrafunctional monomers such as pentaerythritol polypropoxytetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, etc. Mer, other 5 dipentaerythritol penta (meth) acrylate as a functional or more monomers, dipentaerythritol hexa (meth) acrylate. When a monomer, prepolymer, or oligomer is used as the active energy ray-curable composition, the trifunctional or higher functional monomer, prepolymer, or oligomer is preferably used within 20 to 95% by weight. If it is 20% by weight or less, the adhesiveness to the polymer film is weak, the film density and the film strength are low, and if it is 95% by weight or more, it becomes too hard to be brittle, and the print reproducibility of fine lines may be deteriorated. .

  In the present invention, ionizing rays used for ionizing ray irradiation include methods such as laser beam, ion beam, electron beam beam, ultraviolet ray irradiation, plasma discharge, corona discharge, etc. Among them, electron beam, plasma discharge, corona discharge, etc. Preferably used, more preferably corona discharge is used. In the present invention, surface treatment using corona discharge is referred to as corona treatment.

For the corona discharge treatment, a spark gap method, a vacuum tube method, a solid state method, or the like can be used. In order to ensure adhesion with the resin coating film, energy of about 5 to 40,000 W / m ² / min), preferably about 150 to 40,000 W / m ² / min is radiated to the surface of the base material. It is preferable. Surface treatment using corona discharge (corona treatment). The type and frequency of the oscillator of the corona discharge device can be arbitrarily determined.

  Examples of the electron beam irradiation treatment include α rays, β rays, and γ rays emitted from radioisotopes. Also, Mini-EB, Van de Clark type electron accelerator, Cockloft-Walton type electron accelerator, Insulation transformer type electron accelerator, Transformer type gas (oil) insulation type electron accelerator, Cold cathode impact voltage type electron accelerator, Wire Mention may be made of electron beams from filamentary electron accelerators. The acceleration voltage is not particularly limited, but is preferably 150 kV or less, more preferably 100 kV or less in consideration of the influence on the film substrate. The irradiation amount is preferably 15 kGy or more, more preferably 20 kGy or more. However, the irradiation amount more than necessary is not feasible in terms of energy cost.

The plasma treatment usually uses glow discharge of a low pressure gas (argon, nitrogen, oxygen, etc.) of 10 ^{−2 to} 10 Torr, and particularly preferably air or oxygen gas having a pressure of about 0.01 to 0.1 Torr. Plasma is used.

The printing plate thus manufactured is irradiated with a laser beam 5 in a predetermined pattern as shown in FIG. 2 or FIG. 4, and the polymer film 3 is thermally erased to form openings 6 of the predetermined pattern. Is done. As the laser light, carbon dioxide laser light, YAG laser light, or YVO ₄ laser light is preferable. The second harmonic (wavelength 532 nm) or the third harmonic (wavelength 355 nm) is efficiently output from the second or third harmonic conversion element incorporated in the YAG laser oscillator. The fourth harmonic (wavelength 266 nm) is generally output as the second harmonic passes through the fourth harmonic conversion element, and is either one of the higher-order harmonics of the YAG laser or these It is particularly preferable to use any mixing light. These carbon dioxide laser light, YAG laser light, and the like are superior in oscillation stability to excimer laser light, and can increase productivity compared to the case where an excimer laser is used.

  The irradiation intensity of the polymer film by the laser light is set so that the polymer film is thermally erased, but the resin screen is not substantially damaged. The irradiation intensity by the laser beam can be controlled by various methods such as using the laser oscillation apparatus having an output suitable for the irradiation intensity of the present invention, controlling the output of the laser apparatus, and controlling the scanning speed. As laser irradiation conditions, a laser power of 10 to 90%, a scan speed of 5 to 8000 mm / s, a Q switch frequency of 5 to 150 kHz, and a scan count of 3 to 30 are preferable.

  By using the resin screen printing plate thus produced, it is possible to print on the same substrate to be printed by the same method as the conventional screen printing. The ink used may be the same as the conventional one.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, the following Examples are given in order to demonstrate this invention concretely, and do not restrict | limit this invention at all. In the present invention, “parts” and “%” are based on weight unless otherwise specified.

[Example 1]
Low-density polyethylene containing carbon black (density 0.922 g / cm ³ , melting point 113 ° C., carbon black addition amount 0.3%) is laminated on one side of a 270 mesh polyester (PET) basket to a thickness of 40 μm by extrusion lamination. Thus, a sheet-like substrate was obtained, and a plate (printing plate) before plate making was prepared. During lamination, the polymer film was not melted (see FIG. 1).

  On this resin screen printing plate before plate making, a number pattern from 0 to 9 was made with 18 points of font with a YAG laser (laser power 80%, scan speed 1518 mm / s, Q switch frequency 20 kHz, number of scans 15 times). . Resin screen printing plates patterned with a numeric pattern (line width 300 μm) were subjected to the following test methods using the following test methods: “laser processability”, “laser plate making”, “print durability”, “continuous printability (printing effect, plate) Was evaluated). The results are shown in Table 1.

(Processability test by laser)
The state of the portion opened by laser light irradiation was observed with a 50 × optical microscope and evaluated based on the following evaluation criteria.
<Evaluation criteria>
○: The opening is exactly open, and the 270 mesh polyester bag is not damaged.
Δ: The opening is open, but some damage is observed in the 270 mesh polyester bag.
×: The opening is hardly penetrated, or damage is considerably observed in the polyester mesh of 270 mesh.

(Laser plate making test)
Using the produced resin screen printing plate, silk screen ink (SS8391 indigo manufactured by Toyo Ink Manufacturing Co., Ltd.) was printed on paper, and the printing effect was evaluated based on the following evaluation criteria.
<Evaluation criteria>
○: Prints neatly.
Δ: Only printing with missing edges can be performed.
×: Cannot be printed.

(Print durability test)
A squeegee material is fixed to the drive part of the Gakushin type friction tester (manufactured by Tester Sangyo Co., Ltd.), and a resin screen printing plate made by laser is set on the one attached to apply a weight of 500 g. After reciprocating 10,000 times with SS 8391 indigo manufactured by Toyo Ink Mfg. Co., Ltd., using this plate, silk screen ink was printed on paper, and the deterioration of print quality was evaluated based on the following evaluation criteria. did.
<Evaluation criteria>
○: No deterioration in print quality.
Δ: Some degradation of print quality is observed.
X: Deterioration of print quality is observed.

(Continuous printability test)
A resin screen printing plate made by laser is set on a silk screen printing machine (Media 68-AN-II, manufactured by Mino Shoji Co., Ltd.). Printing was performed 5000 times, and the printing effect of the 5000th time and the state of the plate were evaluated based on the following evaluation criteria.
(Continuous printability test: printing effect)
<Evaluation criteria>
○: No deterioration in print quality.
Δ: Some degradation of print quality is observed.
X: Deterioration of print quality is observed.
(Continuous printability test: plate condition)
<Evaluation criteria>
○: There is no deterioration of the plate.
Δ: Part of peeling between the wrinkles and the film is observed.
X: Peeling between the wrinkles and the film is observed.

  Along with these tests, a test sample was prepared under the following conditions for the “fine line printing reproducibility” of the printing plate before plate making, and the tests and evaluations were performed under the following conditions. The results are shown in Table 1.

(Thin wire print reproducibility test)
Using the printing plate obtained above, a fine line having a line width of 100 μm was made under the above conditions (irradiated with a YAG laser (laser power 80%, scan speed 1518 mm / s, Q switch frequency 20 kHz, number of scans 15 times), Printing was performed on paper with silk screen ink (SS8391 indigo manufactured by Toyo Ink Manufacturing Co., Ltd.), and the printed material was observed at the edge portion with a 50 × optical microscope, and evaluated based on the following evaluation criteria.
<Evaluation criteria>
○: A smooth thin line.
(Triangle | delta): It is a jagged thin line.
X: Fine lines cannot be printed.

[Example 2]
In Example 1, a carbon black-containing PET film (density 1.40 g / cm ³ , melting point 258 ° C., carbon black addition amount 0.3%) was used in place of the carbon black-containing low density polyethylene. In the same manner as in Example 1, a resin screen printing plate in which a numerical pattern was patterned was produced. For this resin screen printing plate, in the same manner as in Example 1, evaluation of “processability by laser”, “laser plate making property”, “print durability”, and “continuous printability (printing effect, state of plate)” was performed. went. The results are shown in Table 1.

[Example 3]
In Example 1, at the time of lamination, the polymer film was melted so that the resin screen wrinkles were embedded in the polymer film (see FIG. 3). Others were carried out in the same manner as in Example 1, and a resin screen printing plate having a numerical pattern patterned in the same manner as in Example 1 was produced. For this resin screen printing plate, in the same manner as in Example 1, evaluation of “processability by laser”, “laser plate making property”, “print durability”, and “continuous printability (printing effect, state of plate)” was performed. went. The results are shown in Table 1.

[Example 4]
In Example 3, a carbon black-containing PET film (density 1.40 g / cm ³ , melting point 258 ° C., carbon black addition amount 0.3%) was used in place of the carbon black-containing low density polyethylene. In the same manner as in Example 1, a resin screen printing plate in which a numerical pattern was patterned was produced. For this resin screen printing plate, in the same manner as in Example 1, evaluation of “processability by laser”, “laser plate making property”, “print durability”, and “continuous printability (printing effect, state of plate)” was performed. went. The results are shown in Table 1.

[Comparative Example 1]
A resin screen printing plate was prepared by an ordinary method using “ONEPOT 50M” manufactured by Murakami Co., Ltd., which is the current emulsifier, and a numerical pattern was patterned in the same manner as in Example 1. For this resin screen printing plate, in the same manner as in Example 1, evaluation of “processability by laser”, “laser plate making property”, “print durability”, and “continuous printability (printing effect, state of plate)” was performed. went. The results are shown in Table 1.

Further, “fine line printing reproducibility” of the printing plates used in Examples 2 to 4 and Comparative Example 1 was also evaluated in the same manner as in Example 1. The results are shown in Table 1.
Since Comparative Example 1 was not a laser plate making, evaluation was not performed on “laser processability” and “laser plate making”.

  From Table 1, the resin screen printing plate of the present invention has no practical damage to the resin screen, and can be easily made with a laser beam, has excellent fine line printing reproducibility, and has excellent durability. You can see that

FIG. 2 is a schematic cross-sectional view of a resin screen printing plate heat-sealed to a polymer film. FIG. 3 is a schematic cross-sectional view of a resin screen printing plate in which openings are formed by irradiating a laser beam to a resin screen printing plate thermally fused to a polymer film. FIG. 3 is a schematic cross-sectional view of a resin screen printing plate embedded in a polymer film. FIG. 2 is a schematic cross-sectional view of a resin screen printing plate in which openings are formed by laser light irradiation of a resin screen printing plate embedded in a polymer film.

1 Resin screen printing plate 2 Resin screen ３ 3 Polymer film (layer)
4 Resin screen printing plate 5 Laser light 6 Opening

Claims (9)

  A resin screen printing plate for laser plate making, wherein a resin screen is heat-sealed to a polymer film.   2. The resin screen printing plate for laser plate making according to claim 1, wherein the heat fusion is performed by embedding a resin screen ridge at the time of polymer film injection molding.   3. The resin screen printing plate for laser plate making according to claim 1 or 2, wherein the polymer film contains carbon black.   4. The resin screen printing plate for laser plate making according to any one of claims 1 to 3, wherein the resin screen plate is a screen plate made of nylon or polyester.   A method for producing a resin screen printing plate for laser plate making, comprising heating a polymer film and thermally fusing the polymer film to a resin screen.   A method for producing a resin screen printing plate for laser plate making, wherein a resin screen flaw is present at the time of polymer film injection molding, and the resin screen flaw is embedded in the polymer film.   A resin screen printing plate obtained by irradiating the resin screen printing plate according to any one of claims 1 to 4 with laser light to form a predetermined pattern of openings in a polymer film.   A method for producing a screen printing plate, comprising irradiating the resin screen printing plate according to any one of claims 1 to 4 with a laser beam.   The method for producing a screen printing plate according to claim 8, wherein the irradiation with the laser beam is performed from the opposite side to which the screen ink is supplied during printing.

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