JPWO2008133263A1 - Cylindrical screen plate and manufacturing method thereof - Google Patents

Abstract

Provided are a cylindrical screen plate capable of high-definition rotary screen printing by preventing wear on the inner surface of the cylindrical screen plate and improving durability, and a method for manufacturing the same. A cylindrical screen plate body having a hollow portion inside and a large number of openings corresponding to a printed image, and a squeegee provided in the hollow portion, and ink introduced into the hollow portion is squeegeeed Is a cylindrical screen plate in a screen printing apparatus for transferring the ink through the opening to the substrate by extrusion, so that at least the inner surface of the cylindrical screen plate body is covered with a surface-enhancement coating. did.

Description

  The present invention relates to a cylindrical screen plate used for rotary screen printing and a method for producing the same.

  In rotary screen printing, a cylindrical cylinder made of a material such as nickel with a hollow inside is formed into a cylindrical screen by opening a number of openings according to the printed image. Ink is introduced after a squeegee or the like is attached, and the ink is pushed out from a large number of openings constituting the print image, and the print image is transferred and printed on the substrate. This rotary screen printing is widely performed in general, such as thick film printing, label printing, and electronic board printing because it is easy to thicken the printing layer.

  Such rotary screen printing can be mainly divided into three types due to the difference in the method of forming a cylindrical screen plate (Patent Document 1). The lacquer plate making method is the most common method. A mesh cylinder having a large number of openings is used in advance, a resist is applied to the mesh cylinder, and a printed image is printed on the resist. Thereafter, when the excess resist is removed, a cylindrical screen plate covering the mesh portion of the cylinder corresponding to the printed image is formed. Then, ink is pushed out from the mesh other than the masked portion, and printing is performed on the substrate.

  On the other hand, in the galvano plate making method, a photosensitive resist is uniformly applied to the outer peripheral surface of a mother roll serving as a base material. Next, an image of a document to be printed on the resist is baked, and a portion other than the solidified portion is removed to form a mask layer. After forming the mask layer, it is immersed in a plating tank, and a plating layer is formed in a portion where the mask layer is not formed. Then, after the plating layer is grown to a predetermined thickness, the mask layer is removed from the mother roll. Finally, when the mother roll is removed from the plating layer, a cylindrical screen plate is obtained.

  In the thus obtained cylindrical screen plate for rotary screen printing, portions other than the plating layer serve as openings for extruding ink corresponding to the printed image. Thus, in the galvano plate making method, the formation of holes corresponding to the printed image and the cylinder itself are simultaneously formed in the form of a plating layer.

In contrast to the galvano plate making method, the etching plate making method first forms a plating layer on the entire outer peripheral surface of the mother roll, and forms an opening for extruding ink by performing etching corresponding to the printed image on the plating layer. Screen screen version. In addition to Patent Literature 1, Patent Literature 2 and Patent Literature 3 are known as improvements of these conventional methods.
JP 2000-33685 A Japanese Patent No. 2727445 Japanese Patent Laid-Open No. 5-201164

  In using the cylindrical screen plate formed by the above-described conventional method, a squeegee (internal doctor) is installed in the hollow portion of the cylindrical screen plate, and the ink introduced into the hollow portion is used by utilizing this squeegee. The printed image is extruded from a large number of openings constituting the printed image, and the printed image is transferred to the printing material, but the inner surface side of the cylindrical screen plate formed of a material such as nickel is pressed by a squeegee. The inner surface is easily worn, resulting in a problem in durability, resulting in a problem that high-definition rotary screen printing cannot be performed.

  The present invention has been made in view of the above-described problems of the prior art. A cylindrical screen plate capable of high-definition rotary screen printing by preventing wear on the inner surface of the cylindrical screen plate and improving durability. And it aims at providing the manufacturing method.

  In order to achieve the above object, the cylindrical screen plate of the present invention is provided with a cylindrical screen plate main body having a hollow portion inside and a large number of open portions corresponding to a printed image, and the hollow portion. A squeegee, and a cylindrical screen plate in a screen printing device for transferring the ink introduced into the hollow part to the printing material by passing the ink through the open part by pushing out the ink, At least the inner surface of the cylindrical screen plate main body is coated with a surface reinforcing coating. The thickness of the surface enhancement coating is 0.1 to 10 μm, preferably 0.1 to 5 μm.

  As the surface enhancement coating, a diamond-like carbon coating or a silicon dioxide coating can be used. In the case of a silicon dioxide coating, it is preferable to form the silicon dioxide coating using perhydropolysilazane. The surface-enhanced coating can achieve the effects of the present invention only by coating the inner surface of the cylindrical screen plate body, but is not limited to the inner surface coating, and may cover the outer surface. Needless to say.

  A first aspect of the method for producing a cylindrical screen plate of the present invention is a method for producing a cylindrical screen plate in which a diamond-like carbon coating is formed as a surface-enhanced coating, and the diamond-like carbon coating is formed by a CVD method or a PVD method. It is characterized by forming by.

  A second aspect of the method for producing a cylindrical screen plate according to the present invention is a method for producing a cylindrical screen plate in which a silicon dioxide coating is formed as a surface-enhanced coating. A coating film forming step of coating a polysilazane solution to form a perhydropolysilazane coating film, and heating the coated perhydropolysilazane coating film with superheated steam under a predetermined condition to form a silicon dioxide film having a predetermined hardness. Forming on the surface of the treatment body.

  The heat treatment is a multi-stage heat treatment including a primary heat treatment and a secondary heat treatment, and the conditions of the primary heat treatment are 100 ° C. to 170 ° C., preferably 105 ° C. to 170 ° C., 1 minute to 30 minutes. It is preferable that the conditions of the second heat treatment are 140 ° C. to 200 ° C. and 1 minute to 30 minutes, and the temperature of the second heat treatment is set higher than the temperature of the first heat treatment. In addition, the temperature of the secondary heat treatment is set to be 5 ° C. or higher, preferably 10 ° C. or higher, than the temperature of the primary heat treatment. Moreover, it is preferable to further have the process of wash | cleaning the surface of the silicon dioxide film formed by the said heat processing with cold water or warm water.

  According to the present invention, the great effect of enabling high-definition rotary screen printing is achieved by preventing wear on the inner surface of the cylindrical screen plate and improving durability.

It is a perspective explanatory view showing one embodiment of a cylindrical screen version of the present invention. It is a schematic sectional explanatory drawing which shows the aspect of printing by the cylindrical screen plate of this invention. It is an expanded sectional explanatory view which shows the installation aspect of the surface reinforcement | strengthening film of the inner surface of the cylindrical screen plate of this invention.

Explanation of symbols

  10: Cylindrical screen plate, 12: hollow portion, 14: open portion, 16: cylindrical screen plate main body, 18: squeegee (internal doctor), 20: ink, 22: substrate, 24: inner surface, 26: Surface-enhanced coating, 28: impression cylinder.

  Embodiments of the present invention will be described below with reference to the accompanying drawings, but these embodiments are exemplarily shown, and various modifications can be made without departing from the technical idea of the present invention. Nor.

  In the figure, reference numeral 10 denotes a cylindrical screen plate according to the present invention. The cylindrical screen plate 10 has a cylindrical screen plate main body 16 which has a hollow portion 12 inside and a large number of open portions 14 corresponding to a printed image. A squeegee or internal doctor 18 is provided in the hollow portion 12 of the cylindrical screen plate body 16.

  As shown in FIG. 2, the ink 20 is introduced into the hollow portion 12, and the ink 20 into which the squeegee 18 is introduced is pushed outward to pass the ink 20 through the opening portion 14 to be printed. 22 can be transferred. In FIG. 2, reference numeral 28 denotes an impression cylinder.

  The structural feature of the cylindrical screen plate 10 of the present invention is that at least the inner surface 24 of the cylindrical screen plate body 16 is covered with a surface-enhancement coating 26, as well shown in FIG. The thickness of the surface enhancement coating 26 is 0.1 to 10 μm, preferably 0.1 to 5 μm.

  As the surface enhancement coating 26, a diamond-like carbon coating or a silicon dioxide coating can be used. In the case of a silicon dioxide coating, it is preferable to form the silicon dioxide coating using perhydropolysilazane.

  A first aspect of the method for producing a cylindrical screen plate of the present invention is a method for producing a cylindrical screen plate in which a diamond-like carbon coating is formed as a surface-enhanced coating, and the diamond-like carbon coating is formed by a CVD method or a PVD method. It is formed by.

  The CVD method includes an APCVD (Atmospheric Pressure Chemical Vapor Deposition) method in which a film is formed at atmospheric pressure using a hydrocarbon-based source gas, an LPCVD (Low Pressure Chemical Vapor Deposition) method in which a film is formed at a reduced pressure of about 0.05 Torr, SACVD (Subatmospheric Pressure Chemical Vapor Deposition) method with a pressure of about 600 Torr, slightly lower than the pressure, UHVCVD (Ultra-High-Vacuum Chemical Vapor Deposition) method, high-temperature thermal CVD method at 600-1000 ° C, high-frequency plasma energy Plasma CVD (Plasma-Enhanced Chemical Vapor Deposition) method for forming a film at 200 to 450 ° C., photo-CVD method using excitation by ultraviolet light, MOCVD (Metal Organic Chemical Vapor) for compound crystal growth using an organic metal as a source The Deposition method is known, but the plasma CVD method is preferred.

As the hydrocarbon-based source gas, conventionally known cyclohexane, benzene, acetylene, methane, butylbenzene, toluene, cyclopentane, or the like can be used.
A thickness of about 0.1 to 1 μm made of aluminum (Al), phosphorus (P), titanium (Ti), silicon (Si) or the like is provided between the surface of the cylindrical screen plate main body and the diamond-like carbon film. It is preferable to form a CVD adhesion layer (not shown). The CVD adhesion layer can be formed by a CVD method using a gas species containing the metal, for example, trimethylaluminum, titanium tetraisopropoxide, tetramethylsilane, trimethyl phosphite, or the like.

Examples of the PVD method include a sputtering method, a vacuum deposition method (electron beam method), an ion plating method, an MBE (molecular beam epitaxy method), a laser ablation method, and an ion assist film forming method. Is preferred.
In addition, between the surface of the cylindrical screen plate main body and the diamond-like carbon coating, tungsten (W), titanium (Ti), silicon (Si), chromium (Cr), tantalum (Ta), zirconium (Zr), etc. It is preferable to form a PVD adhesion layer (not shown) having a thickness of about 0.1 to 1 μm. The PVD adhesion layer can be formed by a PVD method such as a sputtering method.

  A second aspect of the method for producing a cylindrical screen plate according to the present invention is a method for producing a cylindrical screen plate in which a silicon dioxide coating is formed as a surface-enhanced coating. A coating film forming step of forming a perhydropolysilazane coating film having a predetermined thickness by applying a polysilazane solution, and heating the coated perhydropolysilazane coating film with superheated steam under predetermined conditions to obtain a dioxide dioxide having a predetermined hardness. Forming a silicon film on the surface of the object to be processed. As a coating method of the perhydropolysilazane solution, a known coating method such as spray coating, inkjet coating, fountain coating, dip coating, spin coating, roll coating, wire bar coating, air knife coating, blade coating, curtain coating or the like is used. be able to.

  As the solvent for dissolving the perhydropolysilazane, known solvents may be used. For example, benzene, toluene, xylene, ether, THF, methylene chloride, carbon tetrachloride, anisole, decalin, cyclohexene, methylcyclohexane, sorbeso, decahydro 5% by weight or more of naphthalene, methyl tertiary butyl ether, diisobutyl ether, ethylcyclohexane, limonene, hexane, octane, nonane, decane, C8-C11 alkane mixture, C18-C11 aromatic hydrocarbon mixture, C8 or higher aromatic hydrocarbon An aliphatic / alicyclic hydrocarbon mixture containing 25% by weight or less, dibutyl ether, and the like can be used.

  The perhydropolysilazane solution prepared by dissolving in the above-mentioned various solvents can be converted into silicon dioxide by heating with superheated steam, but the reaction rate is increased, the reaction time is shortened, the reaction temperature is decreased, and formed. It is preferable to use a catalyst for the purpose of improving the adhesion of the silicon dioxide film. These catalysts are also known. For example, amines and palladium are used. Specifically, organic amines such as primary to tertiary straight chain in which 1-3 alkyl groups of C1-5 are arranged. Aliphatic amines, primary to tertiary aromatic amines having 1 to 3 phenyl groups arranged, pyridine or cyclic aliphatic amines in which an alkyl group such as methyl or ethyl group is substituted with a nucleus. More preferable examples include diethylamine, triethylamine, monobutylamine, monopropylamine, dipropylamine and the like. These catalysts may be added in advance to the perhydropolysilazane solution, or may be contained in a vaporized state in the treatment atmosphere during the heat treatment with superheated steam.

  The heat treatment is a multi-stage heat treatment including a primary heat treatment and a secondary heat treatment, and the conditions of the primary heat treatment are 100 ° C. to 170 ° C., preferably 105 ° C. to 170 ° C., 1 minute to 30 minutes. It is preferable that the conditions of the second heat treatment are 140 ° C. to 200 ° C. and 1 minute to 30 minutes, and the temperature of the second heat treatment is set higher than the temperature of the first heat treatment. In addition, the temperature of the secondary heat treatment is set to be 5 ° C. or higher, preferably 10 ° C. or higher, than the temperature of the primary heat treatment. Moreover, it is preferable to further have the process of wash | cleaning the surface of the silicon dioxide film formed by the said heat processing with cold water or warm water.

  EXAMPLES The present invention will be further described below with reference to examples of the present invention. However, it should be understood that these examples are given by way of illustration and should not be construed as limiting.

Example 1
A diamond-like carbon film having a thickness of 1 μm was formed on the inner surface of a nickel cylindrical screen body produced by a conventional method by plasma CVD using acetylene as a hydrocarbon-based source gas. A cylindrical screen plate was prepared by attaching a squeegee or the like to the cylindrical screen plate body to obtain a screen printing apparatus. When screen printing was performed using this printing apparatus, the action of the squeegee on the inner surface coated with the diamond-like carbon film was smooth, and good printing results were obtained. In addition, the diamond-like carbon film formed on the inner surface of the cylindrical screen plate is very hard, and the wear resistance against squeegee is greatly improved compared to the conventional cylindrical screen plate without the surface-enhanced coating. confirmed.

(Example 2)
A diamond-like carbon coating was formed by sputtering on the inner surface of a nickel cylindrical screen plate body produced by a conventional method. The conditions of the sputtering method are as follows. DLC sample: solid carbon target, atmosphere: argon atmosphere, deposition temperature: 200 to 300 ° C., deposition time: 150 minutes, deposition thickness: 1 μm. A cylindrical screen plate was prepared by attaching a squeegee or the like to the cylindrical screen plate main body to obtain a screen printing apparatus. When screen printing was performed using this printing apparatus, the action of the squeegee on the inner surface coated with the diamond-like carbon film was smooth, and good printing results were obtained. In addition, the diamond-like carbon film formed on the inner surface of the cylindrical screen plate is very hard, and the wear resistance against squeegee is greatly improved compared to the conventional cylindrical screen plate without the surface-enhanced coating. confirmed.

(Example 3)
Perhydropolysilazane solution [Aquamica (registered trademark of AZ Electronic Materials Co., Ltd.) NL120A (trade name, manufactured by AZ Electronic Materials Co., Ltd., dibutyl ether solution containing 20% by mass of perhydropolysilazane)] The solution diluted with a dibutyl ether solution so as to contain 4% by mass] was HVLP sprayed onto the inner surface of a nickel cylindrical screen plate body produced by a conventional method. The coating film thickness was 0.8 μm. The cylindrical screen plate body coated with this perhydropolysilazane was subjected to two-stage heat treatment (140 ° C. 5 minutes + 170 ° C. 5 minutes) using superheated steam to form a silicon dioxide coating. This film had an extremely high film hardness that was not damaged by a cutter knife. A cylindrical screen plate was prepared by attaching a squeegee or the like to the cylindrical screen plate main body to obtain a screen printing apparatus. When screen printing was performed using this printing apparatus, the effect of the squeegee on the inner surface coated with the silicon dioxide film was smooth, and good printing results were obtained. In addition, the silicon dioxide film formed on the inner surface of the cylindrical screen plate is very hard, and it has been confirmed that the abrasion resistance against squeegee is greatly improved compared to the conventional cylindrical screen plate without the surface-enhanced coating. did.

Claims (8)

  A cylindrical screen plate body having a hollow portion inside and a large number of open portions corresponding to a print image, and a squeegee provided in the hollow portion, and the ink introduced into the hollow portion A cylindrical screen plate in a screen printing apparatus in which the ink passes through the opening portion and is transferred to a printing material by extruding a squeegee, and at least the inner surface of the cylindrical screen plate body is coated with a surface-enhancement coating A cylindrical screen plate characterized by that.   2. The cylindrical screen plate according to claim 1, wherein the thickness of the surface reinforcing coating is 0.1 to 10 [mu] m.   The cylindrical screen plate according to claim 1 or 2, wherein the surface-enhanced coating is a diamond-like carbon coating.   The cylindrical screen plate according to claim 1 or 2, wherein the surface-enhanced coating is a silicon dioxide coating, and the silicon dioxide coating is formed using perhydropolysilazane. A method for producing a cylindrical screen plate according to claim 3,
A method for producing a cylindrical screen plate, wherein the diamond-like carbon film is formed by a CVD method or a PVD method. A method for producing a cylindrical screen plate according to claim 4,
A coating film forming step of forming a perhydropolysilazane coating film by coating a perhydropolysilazane solution on at least an inner surface of the cylindrical screen plate body;
Heating the applied perhydropolysilazane coating film with superheated steam to form a silicon dioxide coating on at least the inner surface of the cylindrical screen plate body; and
A method for producing a cylindrical screen plate, comprising:   The heat treatment is a multi-stage heat treatment including a primary heat treatment and a secondary heat treatment, and the conditions of the primary heat treatment are 100 ° C. to 170 ° C., 1 minute to 30 minutes, and the secondary heat treatment. The condition is set to 140 ° C to 200 ° C, 1 minute to 30 minutes, and the temperature of the second heat treatment is set higher than the temperature of the first heat treatment. Production method.   The method for producing a cylindrical screen plate according to claim 6 or 7, further comprising a step of washing the surface of the silicon dioxide film formed by the heat treatment with cold water or warm water.

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