JP2008179028A - Printing method using intaglio offset printing method - Google Patents

Abstract

In continuous printing by intaglio offset printing, the occurrence of a pyring phenomenon is reduced and the number of times of continuous printing until the occurrence of the pyring phenomenon is increased.
After printing ink 11 is filled in a printing plate 10 having a concave pattern 10a, the ink 11 filled from the printing plate 10 is transferred to a roll-shaped printing blanket 13 having a silicon rubber sheet 13a on the surface. In the printing method of the coating film using the intaglio offset printing method in which the printing blanket 13 is rotated to transfer the ink 11 from the printing blanket 13 to the transfer target 16, the printing blanket 13 is transferred from the printing blanket 13 to the transfer target 16. After the ink 11 is transferred, the silicone rubber sheet 13a on the surface of the printing blanket 13 is irradiated with microwaves so that the temperature of the printing blanket 13 is 70 to 130 ° C. and the silicone rubber sheet 13a is dried. To do.
[Selection] Figure 1

Description

  The present invention relates to a printing method excellent in printing an electrode pattern on a substrate of a plasma display panel (hereinafter referred to as PDP) using an intaglio offset printing method.

Conventionally, a photolithography method has been used as a method for forming an electrode pattern. However, this photolithography method has a problem that the manufacturing process becomes complicated and the manufacturing cost is extremely high because the exposure apparatus and materials necessary for forming the electrode pattern are very expensive. Further, it is expensive to process the waste liquid generated in the development process, and this waste liquid has a problem from the viewpoint of environmental protection. Therefore, an intaglio offset printing method provided with a printing blanket having a surface made of a silicone rubber sheet has been attracting attention as a method for forming a pattern that does not cause harmful waste liquid or the like at low cost instead of the photolithography method.
However, in the conventional intaglio offset printing method, as the printing is continuously performed, when the printing ink is applied from the printing blanket to a transfer medium such as a glass substrate, the printing ink is placed on the printing blanket. There was a problem that the phenomenon of so-called piling that gradually remained. One of the causes of the pyring phenomenon is that when the printing blanket is rotated to transfer the printing ink from the silicone rubber sheet on the surface of the printing blanket to the glass substrate, the printing ink is internally divided and used for printing. It is considered that a part of the ink remains on the silicone rubber sheet. Due to this pyring phenomenon, there is a problem that the obtained coating film causes a phenomenon or variation in film thickness and variation in line width.

In order to solve these problems, a method of evaporating and removing the solvent that has penetrated into the surface printing layer by heating the surface of the printing blanket, that is, the surface printing layer, is disclosed. (For example, refer to Patent Document 1). As for the heating method, a printing blanket surface using a silicon elastomer is used, a printing ink containing a low molecular weight polysiloxane in the ink, and a printing ink. Is transferred from the printing blanket to the transfer object, and then the surface of the printing blanket is irradiated with infrared rays, heated by a hot air or heated to evaporate the solvent of the printing ink absorbed by the printing blanket, A method for cooling the surface of a printing blanket is disclosed. (For example, refer to Patent Document 2).
JP 2002-245931 A (Claim 1) Japanese Patent Laying-Open No. 2004-66804 (Claim 1)

  However, in the method shown in the above-mentioned Patent Document 2, as a method for heating the surface of the printing blanket to evaporate the solvent of the printing ink absorbed by the printing blanket, infrared irradiation, hot air injection or a heater is used. Since it was used, the inside of the surface printing layer of the printing blanket was not sufficiently dried. In addition, since these heating methods are heating by heat conduction, it takes time to evaporate the solvent component that has penetrated deep inside the surface printing layer of the printing blanket. In addition, it takes time for heating and cooling, and the tact time becomes long, resulting in a problem that productivity is lowered.

The first object of the present invention is to reduce the occurrence of the pyring phenomenon in continuous printing by intaglio offset printing and to increase the number of continuous printing until the pyring phenomenon occurs. It is to provide a method for printing a film.
A second object of the present invention is to provide a method for producing a conductive film for a bus electrode, which can form a white conductive film having an excellent line shape on a plasma display panel substrate by the intaglio offset printing method of the present invention. There is to do.
A third object of the present invention is to provide a method for producing a black film for a bus electrode, which can form a black film having an excellent line shape on a plasma display panel substrate by the intaglio offset printing method of the present invention. It is in.
A fourth object of the present invention is to provide a black stripe manufacturing method capable of forming black stripes having excellent line shapes on a plasma display panel substrate by the intaglio offset printing method of the present invention.

As shown in FIG. 1, the invention according to claim 1 has a concave pattern 10a for printing ink 11 containing a powder component, a resin component, a solvent component, and a dispersant each composed of an inorganic powder or an organic powder. After filling the printing plate 10 and transferring the ink filled from the printing plate 10 to the roll-shaped printing blanket 13 having the silicone rubber sheet 13a on the surface, the printing blanket 13 is rotated to be transferred from the printing blanket 13. This is an improvement of a method for printing a coating film using an intaglio offset printing method for transferring ink to the body 16. The characteristic structure is that after the printing ink 11 is transferred from the printing blanket 13 to the transfer target 16, the surface of the printing blanket is irradiated by irradiating the silicone rubber sheet 13a on the surface of the printing blanket 13 with microwaves. The silicone rubber sheet 13a is dried at 70 to 130 ° C.
In the invention according to claim 1, after transferring the printing ink from the printing blanket to the transfer medium, the temperature of the printing blanket is set to 70 to 130 ° C., and microwave irradiation is used as a means for drying the silicone rubber sheet. Thus, the inside of the silicone rubber sheet on the surface of the printing blanket can be sufficiently dried. Since heating by microwaves is not heating by heat conduction such as heating by infrared rays, the solvent component that has penetrated deep inside the silicone rubber sheet is sufficiently heated in a short time to volatilize and remove. be able to. These effects can reduce the occurrence of the pyring phenomenon in continuous printing, and can increase the number of continuous printings until the pyring phenomenon occurs.

The invention according to claim 2 is the printing method according to claim 1, wherein the silicone rubber sheet on the surface of the printing blanket is dried by using both microwave irradiation and infrared irradiation.
In the invention according to claim 2, the silicone rubber sheet on the surface of the printing blanket is dried by using microwave irradiation and infrared irradiation in combination. The entire silicone rubber sheet can be dried without spots and in a short time by infrared rays.

  The invention according to claim 3 is the printing method according to claim 1 or 2, wherein the microwave frequency is 900 to 3000 MHz.

  The invention according to claim 4 is the invention according to claim 1, wherein the resin component is a styrene-acrylic copolymer, a urethane-acrylic copolymer, an epoxy-acrylic copolymer, a polyurethane acrylate, a polyepoxy acrylate, a polyester. It contains one or more components selected from the group consisting of acrylate, polyether acrylate and polybutadiene acrylate, and the solvent component is diethylene glycol monobutyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, γ-butyl lactone, diethylene glycol monomethyl ether, Diethylene glycol monoethyl ether, ethylene glycol monophenyl ether, ethylene glycol dibutyl ether, propylene glycol monomethyl ether , Propylene glycol monoethyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, triethylene glycol, triethylene glycol monomethyl ether, triethylene glycol A printing method comprising one or more components selected from the group consisting of monoethyl ether, triethylene glycol monobutyl ether, 3-methoxy-3-methyl-1-butanol, polyester polyol and hydroxyl group-containing liquid acrylic resin. is there.

  The invention according to claim 5 is a white conductive paste in which the printing ink contains a conductive powder, and the conductive ink is applied to the plasma display panel substrate by the printing method according to any one of claims 1 to 4. A bus comprising: a step of printing to form a coating film; a step of drying the formed coating film; and a step of forming a white conductive film on the substrate by firing the dried coating film It is a manufacturing method of the electrically conductive film for electrodes.

  The invention according to claim 6 is a black paste composition in which the printing ink contains black oxide powder, glass powder, a resin component, a solvent component and a dispersant, and the printing method according to any one of claims 1 to 4 Steps of printing a black paste composition on a plasma display panel substrate to form a coating film, drying the formed coating film, and baking the dried coating film to form a black film on the substrate A process for producing a black film for a bus electrode.

  The invention according to claim 7 is a black paste composition in which the printing ink contains black oxide powder, glass powder, a resin component, a solvent component and a dispersant, and the printing method according to any one of claims 1 to 4 Steps of printing a black paste composition on a plasma display panel substrate to form a coating film, drying the formed coating film, and baking the dried coating film to form black stripes on the substrate A step of producing a black stripe.

The method for printing a coating film using the intaglio offset printing method of the present invention is a method for printing by transferring a printing ink from a printing blanket to a transfer medium and then irradiating microwaves as a means for drying the printing blanket. The inside of the silicone rubber sheet on the blanket surface can be sufficiently dried. Heating by microwaves is not heating by so-called heat conduction in which heat is gradually transferred from the heating surface, such as heating by infrared rays, but internal heat generation by friction between molecules caused by irradiation of microwaves. For this reason, the solvent component penetrating deep inside the silicone rubber sheet can be sufficiently vaporized by heating in a short time to be removed. Due to these effects, it is possible to reduce the occurrence of the pyring phenomenon in the continuous printing as compared with the prior art and to increase the number of continuous printings until the pyring phenomenon occurs. Furthermore, since the occurrence of the pyring phenomenon can be reduced, the decrease in film thickness and variation due to the pyring phenomenon, the variation in line width, and the like are eliminated.
For the plasma display panel formed by the manufacturing method according to the present invention, the black film of the bus electrode and the black stripe are excellent in terms of line shape.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
The printing ink used in the present invention is composed of a powder component, a resin component, a solvent component, and a dispersant.

  The powder component contained in the printing ink used in the printing method of the present invention is an inorganic powder or an organic powder. Specific examples include organic pigments, inorganic pigments, glitter pigments, and organic dyes. Further, metal powder, metal oxide, metal nitride, or a mixed powder thereof is particularly suitable because it can be used for printing a conductive pattern. Examples of organic pigments include azo, polyazo, anthraquinone, quinacridone, isoindoline, isoindolinone, phthalocyanine, perylene, DPP, and fluorescent pigments. As inorganic pigments, carbon powders such as acetyl carbon, carbon nanotubes, fullerene, graphite, synthetic silica, chromium oxide, iron oxide, titanium oxide, titanium black, cobalt oxide, copper oxide, complex oxides of these, calcined pigments, Examples thereof include zinc sulfide. Examples of glitter pigments include pearl pigments, flake pigments, aluminum pigments and bronze pigments. Examples of organic dyes include alcohol-soluble dyes, oil-soluble dyes, fluorescent dyes, and light-collecting dyes. The average particle size of the metal powder, metal oxide, metal nitride, or mixed powder thereof is preferably 0.01 to 5 μm, more preferably 0.1 to 1 μm, considering printability and the like.

  The resin component contained in the printing ink used in the printing method of the present invention is a copolymer of polyacrylic acid ester such as polymethyl acrylate, polymethacrylic acid ester such as polymethyl methacrylate, polystyrene, polyurethane, and epoxy resin. Acrylic-styrene copolymer, acrylic-urethane copolymer, acrylic-epoxy copolymer, polyurethane acrylate, polyepoxy in which a part of polyacrylate or polymethacrylate is replaced with urethane or epoxy Examples thereof include one or more components selected from the group consisting of acrylate, polyester acrylate, polyether acrylate, and polybutadiene acrylate. When setting it as 100 weight% of printing ink, it is preferable to mix | blend in the ratio of 5-20 weight% of resin components. Moreover, the molecular weight of these resin components is suitably used in the range of hundreds to millions of oligomers to polymers. The low molecular weight resin component is effective for suppressing drying of the ink, and the high molecular weight resin component can suppress cohesive failure inside the ink. That is, it is effective for improving transferability. Therefore, by containing a resin having a low molecular weight to a high molecular weight and a wide molecular weight in the ink, it is possible to simultaneously satisfy the suppression of drying of the ink and the improvement of transferability. The above-mentioned types of resin components have a high cohesive force, and can suppress cohesive failure inside the ink during transfer to a transfer medium.

  Solvent components contained in the printing ink used in the printing method of the present invention include diethylene glycol monobutyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, γ-butyl lactone, diethylene glycol monomethyl ether, ethylene glycol monophenyl ether, and ethylene glycol dibutyl ether. , Propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, triethylene glycol, triethylene glycol monomethyl One or more components selected from the group consisting of ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, 3-methoxy-3-methyl-1-butanol, polyester polyol and hydroxyl group-containing liquid acrylic resin Is mentioned. When the printing ink is 100% by weight, the solvent component is preferably blended at a ratio of 7.5 to 30% by weight. Polyester polyol [aliphatic polybasic acid having 2 to 12 carbon atoms / aliphatic polyhydric alcohol having 2 to 12 carbon atoms] is poly [(1,9-nonanediol) -o- (adipic acid)]. , Poly [(3-methyl-1,5-pentanediol; trimethylolpropane) -o- (adipic acid)], poly [(3-methyl-1,5-pentanediol) -o- (sebacic acid)] Is mentioned. Polyester polyol [aromatic polybasic acid having 8 to 15 carbon atoms / aliphatic polyhydric alcohol having 2 to 12 carbon atoms] may be poly [(3-methyl-1,5-pentanediol) -o-. (Terephthalic acid)] and poly [(3-methyl-1,5-pentanediol) -o- (isophthalic acid)]. Furthermore, examples of the hydroxyl group-containing liquid acrylic resin include poly 2-hydroxyethyl acrylate, poly 2-hydroxybutyl acrylate, and poly 2-hydroxy methacrylate. The above type of solvent component can dissolve the above type of resin component, and when the printing ink is transferred to the printing blanket, part of the solvent component is absorbed into the silicone rubber sheet on the surface of the printing blanket, Since it penetrates and forms a solvent-rich boundary layer (WBL) between the ink and the silicone rubber sheet, the ink can be transferred without leaving it on the blanket. Further, since the above-mentioned types of solvent components are easily volatile components, it is not necessary to return to the state before the solvent component penetration by heating the blanket into which the solvent component has penetrated as in the conventional method. By using the printing ink containing the solvent component having such performance, there is an advantage that the variation in the shape of the print pattern can be reduced in continuous printing by offset printing.

  The reason why the dispersant is added to the printing ink used in the printing method of the present invention is that an effect of smoothing the coated layer surface is obtained by including the dispersant. When the printing ink is 100% by weight, the dispersant is preferably blended at a ratio of 1 to 10% by weight. In addition, the sharpness at the edge portion of the line to be formed is increased. As the dispersant, a carboxylic acid or phosphate ester, polycarboxylic acid polymer anion allyl ether copolymer, polyamine-fatty acid condensate, polymer surfactant, polymer fatty acid, aliphatic ester condensate may be used. Is preferred.

  The method of printing a coating film using the intaglio offset printing method of the present invention is to fill a printing plate containing the above components with a printing ink having a concave pattern, and to apply a silicone rubber sheet on the surface with the ink filled from the printing plate. This is an improvement of the coating film printing method using the intaglio offset printing method in which the ink is transferred from the printing blanket to the transfer target by rotating the printing blanket after transferring to the roll-shaped printing blanket.

  The characteristic configuration is that after the printing ink is transferred from the printing blanket to the transfer medium, the silicone rubber sheet on the surface of the printing blanket is irradiated with microwaves, so that the temperature of the printing blanket is set to 70 to 130 ° C. The silicone rubber sheet is being dried. Heating by microwaves is not heating by so-called heat conduction where heat is gradually transferred from the heating surface, such as heating by infrared rays, but is internal heat generation due to friction between molecules caused by irradiation of microwaves. . Therefore, by using microwaves to dry the silicone rubber sheet, the solvent component penetrating deep inside the silicone rubber sheet is volatilized by heating sufficiently and in a shorter time than when using infrared rays, Can be removed. About the microwave used by this invention, it is preferable to use what has a frequency of 900-3000 MHz. When the microwave having a frequency in the range of 900 to 3000 MHz is irradiated, an effect of sufficiently volatilizing the solvent component in the blanket silicone rubber sheet is obtained. What is necessary is just to adjust suitably about the irradiation intensity | strength and irradiation time of a microwave according to the maximum temperature set at the time of drying. The reason why the temperature is set to 70 ° C. or higher in the printing method of the present invention is that if the temperature is lower than 70 ° C., the solvent component cannot be sufficiently volatilized. Also, the temperature was set to 130 ° C. or higher because when the temperature exceeded 130 ° C., the silicone rubber sheet was deformed, and this caused problems such as disturbance in the shape of the printing line. is there. In the printing method of the present invention, a higher effect can be obtained by using a heating method other than microwave irradiation in combination. For example, if used in combination with a heating method by heat conduction, the inside of the silicone rubber sheet is dried by microwave heating, and the surface is dried by heating by other heat conduction sufficiently and in a shorter time than when only microwaves are used. be able to. As another heating method used in combination with microwave irradiation, it is preferable to use infrared irradiation because it does not interfere with each other. The infrared irradiation may be performed simultaneously with the microwave irradiation or before and after the microwave irradiation. The infrared irradiation intensity and irradiation time in the case of irradiating infrared rays simultaneously with the microwave irradiation need to be adjusted in consideration of the microwave irradiation intensity and irradiation time. For example, when the microwave irradiation intensity at this time is 100 to 500 W and the irradiation time is 10 to 60 seconds, the infrared irradiation intensity is preferably 500 to 1000 W and the irradiation time is preferably 30 to 60 seconds. When infrared rays are irradiated before and after microwave irradiation, the infrared irradiation intensity and irradiation time may be appropriately adjusted according to the maximum temperature set during drying.

Next, a method for printing a coating film using the intaglio offset printing method of the present invention will be described.
FIG. 1 is a schematic diagram showing an example of a printing process of an intaglio offset printing method according to the present invention. The intaglio offset printing apparatus shown in FIG. 1 includes a printing blanket 13 having a silicone rubber sheet 13a on the surface, a microwave irradiation device 14 and an infrared irradiation device 15 as devices for heating the silicone rubber sheet 13a, and a desired concave pattern 10a. And a printing plate 10 having.

  First, as shown in FIG. 1A, a predetermined amount of printing ink 11 is supplied to the surface of the flat intaglio 10. The supplied printing ink 11 is embedded in the concave pattern 10 a by sliding the squeegee 12 against the surface of the flat intaglio 10. Next, as shown in FIG. 1B, the blanket roll 13 is pressed onto the flat intaglio 10 in which the ink 11 is embedded, and the blanket roll 13 is rotated and slid on the flat intaglio 10 in this state. Then, a part of the ink 11 embedded in the concave pattern 10 a is transferred to the surface of the silicone rubber sheet 13 a of the blanket roll 13. A silicone resin sheet may be attached to the blanket roll surface instead of the silicone rubber sheet. The transfer rate at this time is approximately 20 to 60%, although it varies depending on the concave pattern of the plane intaglio, the components contained in the ink, the ratio thereof, and the pressure of the blanket. Finally, as shown in FIG. 1 (c), the blanket roll 13 to which the printing ink 11 has been transferred is pressed against a transfer body 16 such as a glass substrate, and the blanket roll 13 is placed on the transfer body 16 in this state. , The desired pattern is transferred to the surface of the transfer target 16. At this time, the silicone rubber sheet 13a that has sequentially transferred the printing ink 11 to the transfer target 16 is irradiated with microwaves by the microwave irradiation device 14 provided at the position shown in FIG. The silicone rubber sheet 13a is dried at a temperature of ° C. The silicone rubber sheet 13a is dried by irradiating microwaves, and by using microwave irradiation and infrared irradiation in combination, the silicone rubber sheet is irradiated with microwaves and the silicone rubber sheet surface is irradiated with infrared rays. The entire rubber sheet can be dried without spots and in a short time.

  As described above, in the printing method of the present invention, the silicone rubber sheet can be sufficiently dried in a short time by using microwave irradiation and further using microwave irradiation and infrared irradiation in combination for each printing. With these effects, it is possible to reduce the occurrence of the pyring phenomenon in continuous printing and to increase the number of continuous printings until the pyring phenomenon occurs.

Next, a method for producing a front substrate for PDP using the method for producing a conductive film, black film and black stripe of the present invention will be described.
2 and 3 are diagrams schematically showing a process of manufacturing a plasma display panel front substrate.
First, a windshield substrate 16 as shown in FIG. 2A is prepared, and a transparent electrode 23 is formed on the windshield substrate 16 as shown in FIG. The transparent electrode 23 formed here is formed of a transparent material that is necessary for plasma discharge and does not hinder light emission. Specifically, the transparent electrode 23 uses an oxide film such as ITO (Indium Tin Oxide) or SnO _2, and is formed by a vacuum film forming method such as sputtering or vapor deposition or a CVD (Chemical Vapor Deposition) method.

Next, as shown in FIG. 2 (c), a black paste composition is coated on the formed transparent electrode 23 by the intaglio offset printing method of the present invention, and then dried and baked, whereby the black film 17b is formed. Form. The black paste composition used in the production method of the present invention contains black oxide powder, glass powder, a resin component, a solvent component, and a dispersant. The black oxide powder contained in the black paste composition is a metal oxide containing one or more metal elements selected from the group consisting of Co, Cr, Cu, Mn, Fe and Ni, or a composite oxide thereof. It is preferable that The glass powder contains one or more oxides selected from the group consisting of lead oxide, bismuth oxide, zinc oxide, boron oxide, silicon oxide, aluminum oxide, phosphorus oxide, calcium oxide and titanium oxide, 400 to 400 A frit glass having a softening point of 550 ° C. is preferable. Subsequently, as shown in FIG. 2D, a highly conductive white conductive paste containing conductive powder such as Ag, Au, Pt, or Pd is applied and fired on the formed black film 17b. As a result, a white conductive film 17a is formed. As a result, the bus electrode 17 composed of the black film 17b and the white conductive film 17a is formed. By using the intaglio offset printing method of the present invention, it is possible to reduce the occurrence of a pyring phenomenon in continuous printing and to increase the number of continuous printings until the pyring phenomenon occurs.
Next, as shown in FIG. 2E, a transparent dielectric layer 21 is formed on the entire surface of the windshield substrate 16 so as to cover the transparent electrode 23 and the bus electrode 17.

  Next, as shown in FIG. 3 (a), a black paste composition is coated on the formed transparent dielectric layer 21 by the intaglio offset printing method of the present invention, and then dried and baked. A black stripe 24 is formed. By forming the black stripe 24, the external light reflectance is reduced and the contrast is improved. By using the intaglio offset printing method of the present invention, it is possible to reduce the occurrence of the pyring phenomenon in the continuous printing of the black paste composition and to increase the number of continuous printings until the pyring phenomenon occurs.

Next, as shown in FIG. 3B, the color filter 22 is formed on the transparent dielectric layer 21 so as to have the same height as the black stripe 24. Subsequently, as shown in FIG. 3C, a transparent dielectric layer 21 is formed on the color filter 22 and the black stripe 24. Further, as shown in FIG. 3D, a protective film 19 is formed on the transparent dielectric layer 21.
The protective film 19 is formed when the dielectric layer is damaged by ion bombardment due to discharge and the panel life is shortened, and the efficiency of secondary electron emission necessary for plasma discharge is poor, and the discharge voltage becomes high. This is to prevent this. The protective film 19 is made of MgO and can be formed by electron beam evaporation, ion plating, or sputtering.

  As described above, the front substrate for PDP is obtained through the steps of FIGS. 2 (a) to 3 (d).

Next, examples of the present invention will be described in detail together with comparative examples.
<Example 1>
The powder component, resin component, solvent component and dispersant shown in Table 1 below are mixed, and this mixture is dispersed for 30 minutes with a planetary mixer, then dispersed for 3 minutes with a three-roll mill, and pasted printing ink Was prepared.

  On the other hand, as shown in FIG. 1, a planar intaglio plate 10 having a plurality of concave patterns 10a having a line width of 70 μm, a depth of 20 μm, and a pitch of 200 μm is prepared as a printing plate used in the intaglio offset printing method, and has a thickness as a transfer target. A 2.8 mm, 50 inch diagonal glass substrate (Asahi Glass Co., Ltd. front side electrode substrate: PD200) 16 was prepared. In addition, a blanket roll 13 having a surface of a silicone rubber sheet (room temperature curing type silicone rubber (addition type)) 13a having a thickness of 700 μm and a hardness of 40 (JIS-K6253 type A) is attached as a printing blanket. Using. Moreover, the microwave irradiation apparatus 14 was attached as an apparatus for drying the silicone rubber sheet of a blanket.

  First, a predetermined amount of the printing ink 11 was supplied to the surface of the flat intaglio 10, and the printing ink 11 was embedded in the surface of the flat intaglio 10 using a SUS squeegee 12. Next, the blanket roll 13 is rotated in a state where it is pressed against the flat intaglio 10 and is rolled on the glass substrate 16 to transfer the printing ink 11 having a predetermined pattern on the surface of the glass substrate 16. The surface of the blanket was transferred to the glass substrate, and the blanket roll 13 was irradiated with microwaves to dry the blanket surface.

  The above process was defined as one cycle of the printing process according to the printing method of the present invention, and continuous printing was performed until piling occurred. Also, the printed glass substrate immediately before the occurrence of piling is dried while being held in air at a temperature of 150 ° C., and then is fired in air at a temperature of 560 ° C. for 10 minutes. A conductive film was formed.

＜実施例２，３＞
ブランケットのシリコーンゴムシートの乾燥用装置として、図１（ｃ）に示すように、マイクロ波照射装置１４と赤外線照射器１５を取り付け、上記表２に示す条件で、マイクロ波及び赤外線を照射したこと以外は実施例１と同じ条件で印刷を行った。また、印刷用インキは実施例１と同じものを使用した。

<Examples 2 and 3>
As shown in FIG. 1 (c), a microwave irradiation device 14 and an infrared irradiator 15 were attached as a device for drying a blanket silicone rubber sheet, and microwaves and infrared rays were irradiated under the conditions shown in Table 2 above. Except for the above, printing was performed under the same conditions as in Example 1. Further, the same printing ink as in Example 1 was used.

<Example 4>
As shown in Table 1 above, instead of silver powder as a powder component of printing ink, a black pigment (composition ratio) having an average particle diameter of 0.1 μm and a composite oxide of spherical Mn, Cu and Fe , Mn: Cu: Fe = 35: 25: 8.3) was used, and a printing ink prepared by mixing 75 parts by weight was used. The printing conditions were the same as in Example 1.

<Example 5>
As shown in Table 1 above, printing was performed under the same conditions as in Example 1 except that the frequency and the irradiation time were different conditions among the microwave irradiation conditions. Further, the same printing ink as in Example 1 was used.

<Comparative Example 1>
As shown in Table 2, printing was performed under the same conditions as in Example 1 except that microwave irradiation was not performed. Further, the same printing ink as in Example 1 was used.

<Comparative example 2>
For microwave irradiation, printing was performed under the same conditions as in Example 1 except that microwave irradiation was performed under the conditions shown in Table 2 above. Further, the same printing ink as in Example 1 was used.

<Comparative Example 3>
As an apparatus for drying a blanket silicone rubber sheet, an infrared irradiator 15 is attached instead of the microwave irradiator 14 and printing is performed under the same conditions as in Example 1 except that infrared rays are irradiated under the conditions shown in Table 2 above. Went. Further, the same printing ink as in Example 1 was used.

<Comparative Example 4>
As shown in Table 1 above, instead of silver powder as a powder component, a black pigment (composition ratio, Mn: Cu) having an average particle diameter of 0.1 μm and a composite oxide of spherical Mn, Cu, and Fe : Fe = 35: 25: 8.3) was used, and a printing ink prepared by mixing 75 parts by weight was used. Except for this, printing was performed under the same conditions as in Comparative Example 1. The printing conditions were the same as in Example 1.

<Comparison test and evaluation>
The surface temperature of the blanket investigated in Examples 1 to 5 and Comparative Examples 1 to 4, the number of printed sheets until the occurrence of piling, and the line width of the formed conductive film or black film line were evaluated. The results are shown in Table 3 below.
(1) Pile start frequency: After the printing ink is transferred from the blanket roll to the glass substrate, the printing of the present invention is continuously performed until the trouble that the printing ink gradually remains on the blanket roll, that is, the so-called piling phenomenon occurs. The number of printed sheets until the occurrence of piling was examined. This number of printed sheets was defined as the number of times of starting the pile.
(2) Blanket surface temperature: The surface temperature of the blanket after irradiation with microwaves in Example 1 and Comparative Example 2, infrared rays in Example 2, and microwaves and infrared rays in Example 3 was evaluated. About the comparative example 1, since neither microwave and infrared rays were irradiated, the surface temperature after 1 cycle of a printing process was evaluated.
(3) Printability: For the conductive film or black film print line formed on the surface of the glass substrate after firing, the line widths of nine print lines at predetermined positions on each substrate were respectively measured, When the maximum and minimum values of the above measured values are within ± 2μm with respect to the line width of the concave pattern, it is evaluated as “good”, and when it exceeds ± 2μm and within ± 5μm, it is evaluated as “bad”. The value exceeding ± 5 μm was evaluated as “very poor”.

表３から明らかなように、マイクロ波を照射してブランケットのシリコーンゴムシートを乾燥させた実施例１，４，５と、乾燥させていない比較例１を比較すると、実施例１，４，５の方がパイリング開始回数が延びており、マイクロ波を照射してブランケットのシリコーンゴムシートを乾燥させることが効果的であることが確認された。更に、マイクロ波を照射した実施例１，５と赤外線を照射した比較例３を比較すると、実施例１の方がパイリング開始回数が延びており、また、印刷性においても実施例１の方が優れた結果となったことから、赤外線を使用するよりもマイクロ波を使用する方がより効果的であることが確認された。また、実施例２，３では実施例１，５よりも優れた結果が得られたことから、マイクロ波の照射に赤外線の照射を併用することで、本発明の更に高い効果が得られることが確認された。実施例１，５と比較例１，２，４を比較すると、比較例１，４では、パイリング開始回数、印刷性ともに優れた結果が得られず、また、比較例２では、パイリング開始回数においては優れた結果が得られたものの、印刷性において不具合が生じた。このことから、ブランケットの表面温度は、７０℃〜１３０℃の範囲にすることが効果的であることが確認された。

As is apparent from Table 3, Examples 1, 4 and 5 in which the blanket silicone rubber sheet was dried by irradiation with microwaves and Comparative Example 1 in which the blanket was not dried were compared. It was confirmed that it was effective to dry the blanket silicone rubber sheet by irradiating microwaves. Furthermore, comparing Examples 1 and 5 irradiated with microwaves and Comparative Example 3 irradiated with infrared rays, Example 1 has a greater number of times of starting the piling, and the printability of Example 1 is also higher in printability. The excellent results confirm that the use of microwaves is more effective than the use of infrared. In Examples 2 and 3, results superior to those in Examples 1 and 5 were obtained. Therefore, the use of infrared irradiation in combination with microwave irradiation can provide a higher effect of the present invention. confirmed. When Examples 1 and 5 are compared with Comparative Examples 1, 2, and 4, Comparative Examples 1 and 4 do not provide excellent results in both the number of start of piling and printability. In Comparative Example 2, the number of start of piling is Although excellent results were obtained, there was a problem in printability. From this, it was confirmed that the surface temperature of the blanket is effectively in the range of 70 ° C to 130 ° C.

Explanatory drawing which shows the printing process using the intaglio offset printing method in this invention. The figure which shows the front | former stage of the manufacturing process of the front substrate for PDP. The figure which shows the back | latter stage of the manufacturing process of the front substrate for PDP.

Claims (7)

A printing plate containing a powder component composed of an inorganic powder or an organic powder, a resin component, a solvent component, and a dispersant is filled in a printing plate having a concave pattern, and the filled ink from the printing plate is applied to the surface. In a printing method of a coating film using an intaglio offset printing method in which after transferring to a roll-shaped printing blanket having a silicon rubber sheet, the printing blanket is rotated to transfer ink from the printing blanket to a transfer target. ,
After the printing ink is transferred from the printing blanket to the transfer target, the silicone rubber sheet on the surface of the printing blanket is irradiated with microwaves to bring the temperature of the printing blanket to 70 to 130 ° C. A method for printing a coating film using an intaglio offset printing method, wherein   The printing method according to claim 1, wherein the silicone rubber sheet on the surface of the printing blanket is dried by using both microwave irradiation and infrared irradiation.   The printing method according to claim 1, wherein the microwave frequency is 900 to 3000 MHz. One or more resin components selected from the group consisting of styrene-acrylic copolymer, urethane-acrylic copolymer, epoxy-acrylic copolymer, polyurethane acrylate, polyepoxy acrylate, polyester acrylate, polyether acrylate and polybutadiene acrylate Containing two or more ingredients,
Solvent component is diethylene glycol monobutyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, γ-butyl lactone, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, ethylene glycol monophenyl ether, ethylene glycol dibutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether , Propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, triethylene glycol, triethylene glycol monomethyl ether, trie Claims comprising one or more components selected from the group consisting of lenglycol monoethyl ether, triethylene glycol monobutyl ether, 3-methoxy-3-methyl-1-butanol, polyester polyol and hydroxyl group-containing liquid acrylic resin Item 2. The printing method according to Item 1. The printing ink is a white conductive paste containing conductive powder,
A step of printing the conductive ink on a plasma display panel substrate to form a coating film by the printing method according to claim 1,
Drying the formed coating film;
And baking the dried coating film to form a white conductive film on the substrate. Black ink composition containing black oxide powder, glass powder, resin component, solvent component and dispersant
A step of printing the black paste composition on a plasma display panel substrate by the printing method according to claim 1 to form a coating film;
Drying the formed coating film;
Forming a black film on the substrate by firing the dried coating film. A method for producing a black film for a bus electrode, comprising: Black ink composition containing black oxide powder, glass powder, resin component, solvent component and dispersant
A step of printing the black paste composition on a plasma display panel substrate by the printing method according to claim 1 to form a coating film;
Drying the formed coating film;
And a step of forming a black stripe on the substrate by firing the dried coating film.

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