JPH05139065A - Intaglio for printing and method for offset printing using the same - Google Patents

Abstract

PURPOSE:To obtain an intaglio wherein the printed line width is at most about 50mum and the thickness is at least about 10mum or a perfect transfer printing of an ink in a channel of the intaglio is possible by coating only the surface of recessed part formed on a glass base material with a silicone rubber. CONSTITUTION:An ink 5 is filled in the recessed part of an intaglio 10 for printing by using a scraper 4. Then, a cylindrical roller 11 as a transfer body wherein the outermost surface layer is coated with a silicone rubber is rotated on the intaglio for printing while a pushing pressure is applied to transfer the ink 5 onto the cylindrical roller 11. Thereafter, by rotating the cylindrical roller 11 on an body 3 to be printed while a pushing pressure is applied, thick and fine lines with a thickness of 12-13mum can be printed on the body to be printed. An intaglio wherein the printed line width is at most about 50mum and the thickness is at least about 10mum or a perfect transfer printing of an ink in a channel of the intaglio is possible, can be obtd. thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing intaglio for printing thick film fine wiring such as a high-density mounting circuit board and a hybrid IC, and an offset printing method using the same.

[0002]

2. Description of the Related Art In recent years, electronic devices have been required to be smaller and lighter, and it has become essential to increase the density of circuit boards and miniaturize wiring. The miniaturization of wiring has been greatly advanced by the photolithography technology, but there is a problem that the manufacturing cost becomes high. Therefore, research has been conducted to form the fine wiring by a printing technology with a simple process.

Since it is difficult to print fine lines of 50 microns or less by the most general screen printing method, the author invented a fine wiring forming technique by the offset printing method using an intaglio plate (for example, Japanese Patent Application No. 2-120247). ). This printing technique is capable of forming fine printed wiring having a width of 10 to 100 microns.

The conventional intaglio plate for printing and the offset printing method will be described below. FIG. 4 shows a conventional offset printing method.

In FIG. 4, 1 is a conventional glass intaglio,
2 is a silicone rubber roller, 3 is an object to be printed, 4 is a scraper, 5 is ink, and 6 is a printing table. After filling the concave portion of the glass intaglio plate 1 made by etching the glass substrate with the scraper 4 with the organic gold paste as the ink 5, the silicone rubber roller 2 having excellent ink releasability is printed on the intaglio plate 1 under the printing pressure. The fine wiring pattern is once transferred onto the silicone roller 2 by rotating while applying. After that, the silicone rubber roller 2 is rotated on the body 3 to be printed while applying a printing pressure, and printing is performed.

By this method, the thickness is about 3 μm and the line width is 5
Fine wiring of 0 micron or less can be printed, and by firing this at high temperature, gold fine wiring having a thickness of about 1500 angstrom can be easily formed.

[0007]

However, in the above conventional offset printing method, about 1/5 to 3 of the ink filled in the intaglio groove (recess) having a depth of about 15 microns.
Since only about one-third amount is transferred onto the surface of the silicone rubber roller, the printing thickness is relatively thick as compared with the lithographic offset printing method and the like, but printing at a thickness of several microns is the limit.

Therefore, although fine lines can be printed by the conventional offset printing method, in order to obtain fine lines having a printing width of 10 microns or more and a width of 50 microns or less as in a general screen printing method. , It is necessary to perform overprinting.

The present invention solves the above-mentioned problems of the prior art, and has a printing line width of 50 μm or less and a thickness of 10 μm or more, or enables complete transfer printing of ink in an intaglio groove. And an offset printing method using the same.

[0010]

To achieve this object, the printing intaglio plate of the present invention basically has a structure in which only the surface of the intaglio plate formed on a substrate is coated with silicone rubber. .. The base material is preferably made of glass, and the surface of the base material other than the concave portions is preferably subjected to a mold release treatment.

Further, the offset printing method of the present invention uses the intaglio plate for printing and a transfer member having a silicone rubber layer as the outermost surface layer to fill the ink in the recesses of the intaglio plate for printing, and thereafter, A configuration in which the ink is once transferred onto the outermost surface of the transfer body, and then the ink is printed onto the printing medium, or the intaglio plate for printing and a transfer body having a silicone rubber layer on the outermost surface layer are used. Then, the hot-melt adhesive solution is filled in the concave portions of the printing intaglio plate, the solvent is volatilized to form a hot-melt adhesive layer, and then the hot-melt adhesive layer-formed printing intaglio plate is formed. Ink was filled in the concave portion of the ink, and then the ink and the hot melt adhesive were once transferred onto the outermost surface of the transfer body, and then the ink and the hot melt adhesive were heated. It has a configuration to print on a printing substrate.

Further, in the printing method of the present invention, it is preferable that the printing intaglio is kept at a temperature lower than the surface of the transfer body and at a temperature higher than the surface of the transfer body.

[0013]

With the above structure, the printing intaglio plate of the present invention is
All of the ink in the intaglio groove (recess) can be transferred onto the transfer body. This is because only the surface of the intaglio groove is covered with a silicone rubber layer with a thickness of several microns, so the area in contact with the recess of the filled ink will increase in concentration due to the solvent absorption of the silicone rubber, and the ink itself will slowly It is solidified.

Further, since the silicone rubber has an excellent releasing property, the filled ink is easily removed from the concave portion,
All ink can be transferred. Also,
Since the silicone rubber layer is only on the concave surface, it is easy to scrape the ink when filling it with a scraper,
It is possible to easily fill only the concave portion with the ink.

Furthermore, the surface of the base material other than the concave portions may be subjected to a mold release treatment to facilitate the scraping of the ink.

Further, in the offset printing method of the present invention, the intaglio plate for printing of the present invention is used, ink is filled in the intaglio groove, and then a transfer member having a silicone rubber outermost surface excellent in ink releasability is pressed. Is to transfer the ink onto the transfer body, but at this time, the ink in the intaglio groove of the intaglio plate for printing, particularly the part in contact with the recess of the ink, is as described above.
On the other hand, the density of the ink is high, while the surface of the ink still has a lot of solvent and is soft and has stronger adhesiveness.When the transfer body is pressed against the printing intaglio, the ink in the intaglio groove is The solvent can be transferred to the silicone rubber layer while absorbing the solvent, and almost all the ink in the intaglio groove can be transferred to the transfer body side.

Next, the transfer body is pressed onto the printing medium to print thick film fine lines. Furthermore, the offset printing method of the present invention, in the intaglio for printing in which the silicone rubber layer is formed only on the surface of the intaglio groove, the hot melt adhesive layer is first formed, and when ink is further filled from above, a hot Since the melt layer is solidified and easily separated from the intaglio groove, when the transfer body is pressed, the solvent in the ink is absorbed by the silicone rubber layer on the transfer body surface and adheres to the transfer body surface to remove the ink. All can be transferred to a transfer body together with a hot melt adhesive.

Next, when the printing medium is heated and the transfer medium is pressed against it, the hot melt adhesive develops adhesiveness and all the ink can be printed from the transfer medium onto the printing medium.
The thick film thin wire can be easily formed. In this case, since the hot melt adhesive is used, thick film fine line printing can be surely performed even when the ink is completely dried on the transfer body and the adhesive force becomes insufficient.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the printing intaglio of the present invention and the offset printing method of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of an intaglio printing plate showing an embodiment of the intaglio printing plate of the present invention. In FIG. 1, 7 is a glass base material, 8 is a concave portion, and 9 is a silicone rubber layer.

As shown in FIG. 1, the intaglio plate for printing of the present invention is manufactured by coating the surface of only the intaglio groove (recess) with a silicone rubber layer 9, and TSE-3221 (manufactured by Toshiba Silicone Co., Ltd.). Dilute 10 times with xylene, and use a scraper to fill the concave portion 8 of the glass substrate 7 in which the concave portion 8 is formed with the diluted solution of silicone.
The silicone rubber layer 9 was formed by heating to 00 ° C. The thickness of the silicone rubber layer 9 is about 2 microns in the thick part,
The recess depth after forming the silicone rubber layer 9 is 13 microns,
The minimum width was 30 microns.

FIG. 2 is an explanatory diagram showing an offset printing method in the first embodiment of the present invention. In FIG. 2, 10 is an intaglio plate for printing, 11 is a cylindrical roller, 3 is an object to be printed, 4 is a scooper, 5 is ink, and 6 is a printing table. Hereinafter, the reference numerals in the drawings indicate the same names.

First, the ink 5 was filled in the recesses of the intaglio printing plate 10 using the scraper 4. For the ink 5, an organic gold paste was used. Then, the cylindrical roller 11 as a transfer body having the outermost layer coated with silicone rubber (TSE-3402 manufactured by Toshiba Silicone Co., Ltd.) is rotated on the intaglio printing plate 10 while applying pressure, and the ink is applied onto the cylindrical roller 11. 5 was transferred.

Immediately thereafter, the cylindrical roller 11 is rotated while applying a pressing force on the alumina substrate which is the object to be printed 3 to print a thick film fine line having a thickness of 12 to 13 microns on the alumina substrate. I was able to. When this alumina substrate was fired at 550 ° C. in air,
A good gold film could be formed.

The transfer speed to the cylindrical roller 11 is 5
mm / sec or less was good. In this example, a glass base material was used for the intaglio plate for printing in order to obtain a high quality of printing fine line edges, but when the recesses are formed by wet etching, the glass base material has excellent surface smoothness and recesses. Since excellent linearity of the edge was obtained, a thick film printing fine pattern of high quality was obtained at the time of printing, as compared with a stainless intaglio plate.

Further, in the offset printing method of this embodiment, a cylindrical roller is used as the transfer body, but the shape of the transfer body, the ink material, the material to be printed, etc. used in the offset printing method of the present invention are limited to the embodiment. Not something to do. Furthermore, when an intaglio plate for printing is used, which has been subjected to a mold release treatment (a fluorosilicone coating agent KP-801M manufactured by Shin-Etsu Chemical Co., Ltd.) on the portion other than the concave portion of the glass substrate, the ink is easily scraped off by a scraper. became. The release treatment agent and the release treatment method are not limited to those in this example.

(Second Embodiment) A second embodiment of the offset printing method of the present invention will be described below with reference to the drawings. FIG. 3 is an explanatory diagram showing a second embodiment of the offset printing method of the present invention.

In FIG. 3, reference numeral 12 is a hot melt adhesive layer. The same printing plate as in Example 1 was used for the intaglio plate for printing 10, the scraper 4, and the cylindrical roller 11 as a transfer body. Further, a glass substrate was used as the printing medium 3.

First, a scraper 4 was used to fill the concave portion of the intaglio printing plate 10 kept at 20 ° C. with 1 g of a hot melt adhesive (Hirodyne 2302 manufactured by Hirodyne Industrial Co., Ltd.) dissolved in 10 cc of toluene. Then
Hot-melt adhesive layer 12 by evaporating the solvent by blowing air
Formed.

Next, the organic gold paste which is the ink 5 is similarly filled in the concave portion using the scraper 4, and then the cylindrical roller 11 which is the transfer body is slowly rotated while applying a pressing force on the intaglio plate for printing 10. Then, the ink 5 and the hot melt adhesive layer 12 were transferred onto the cylindrical roller 11.

After confirming the quality of the transferred material, 8
The cylindrical roller 11 was rotated while applying a pressing force on the glass substrate, which is the body to be printed 3 kept at 0 ° C., to print a thick film fine line having a thickness of 12 μm on the glass substrate. At this time, the hot melt adhesive seemed to be a little crushed. The room temperature at this time was 24 ° C.

When this glass substrate was fired at 550 ° C. in air, a good gold film could be formed. Also, the transfer speed to the cylindrical roller 11 is 5 mm / sec.
The following was good. Printing on the glass substrate was possible even 10 minutes or more after the ink 5 was transferred to the cylindrical roller 11.

In the offset printing method of this embodiment, a cylindrical roller was used as the transfer body, but the shape of the transfer body, the ink material, the material to be printed, the hot melt adhesive material used in the offset printing method of the present invention. These are not limited to the examples.

[0034]

As described above, the intaglio plate for printing of the present invention basically has a structure in which only the surface of the intaglio plate formed on the substrate is coated with silicone rubber, and the offset printing method of the present invention is also used. Is, using the intaglio plate for printing and a transfer body having a silicone rubber layer on the outermost surface layer, fills the ink in the recesses of the intaglio plate for printing, and thereafter, the ink on the outermost surface of the transfer body. After transferring once, the ink is printed on the printing medium, or by using the intaglio plate for printing and a transfer body having a silicone rubber layer as the outermost surface layer, hot ink is applied to the concave part of the intaglio plate for printing. Filling the melt adhesive solution, after forming a hot melt adhesive layer by volatilizing the solvent, subsequently filled with ink in the recesses of the printing intaglio formed with the hot melt adhesive layer, then, The transfer body By having the configuration that the after once transferring the ink and the hot melt adhesive is printed on the ink and the printing substrate on which a heated hot melt adhesive on the outermost surface, intaglio groove (recess)
It is possible to realize an intaglio printing plate capable of transferring all of the ink contained in the ink onto a transfer body and capable of printing a thin film with a fine line width of 50 μm or less, and an offset printing method using the same.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a printing intaglio according to an embodiment of the printing intaglio of the present invention.

FIG. 2 is an explanatory diagram showing a first embodiment of an offset printing method of the present invention.

FIG. 3 is an explanatory diagram showing a second embodiment of the offset printing method of the present invention.

FIG. 4 is an explanatory diagram showing a conventional offset printing method.

[Explanation of symbols]

 1 Glass Intaglio 2 Silicone Rubber Roller 3 Printed Object 4 Scraper 5 Ink 6 Printing Board 7 Glass Base Material 8 Recess 9 Silicone Rubber Layer 10 Printing Intaglio 11 Cylindrical Roller 12 Hot Melt Adhesive Layer

Claims (6)

[Claims] 1. An intaglio plate for printing, characterized in that only the surface of the recess formed on the substrate is coated with silicone rubber. 2. The intaglio plate for printing according to claim 1, wherein the substrate is made of glass. 3. The intaglio printing plate according to claim 1, wherein the base material is made of glass, and the surface of the base material other than the concave portions is subjected to a release treatment. 4. A concave of the printing intaglio is formed by using a printing intaglio coated with silicone rubber only on the surface of the concave formed on the substrate and a transfer body having a silicone rubber layer as the outermost surface layer. An offset printing method comprising: filling ink, then temporarily transferring the ink onto the outermost surface of the transfer body, and then printing the ink onto a printing medium. 5. A recess of the printing intaglio is prepared by using a printing intaglio coated with silicone rubber only on the surface of the recess formed in the substrate and a transfer body having a silicone rubber layer as the outermost surface layer. After filling the hot-melt adhesive solution and volatilizing the solvent to form a hot-melt adhesive layer, subsequently filling the concave portion of the printing intaglio on which the hot-melt adhesive layer is formed with ink, and thereafter Offset printing, wherein the ink and the hot melt adhesive are once transferred onto the outermost surface of the transfer body, and then the ink and the hot melt adhesive are printed on a heated substrate. Method. 6. The offset printing method according to claim 5, wherein the printing intaglio is kept at a temperature lower than the surface of the transfer body and a temperature of the surface of the printing medium higher than that of the transfer body.