JPS60225453A - Formation of resist pattern - Google Patents

Abstract

PURPOSE:To contrive the continuous formation of fine resist patterns on a long roll of metallic band by a method wherein a fine pattern is printed on the surface of the metallic band by means of a printing machine having a screen printing plate with the number of mesh of 130 or more and an ultraviolet-setting printing ink having resisting property, and is then hardened with ultraviolet rays. CONSTITUTION:A long roll of metallic band 2 rolled out of a take-up reel 1, when passing through a printing roller 3 and an impression drum 4 which rotate in pressure contact, is given a fixed pattern thereon. The printing roller 3 is cylindrical with a stretch of a screen printing plate in the periphery, and is provided inside with a squeegee 5 and an ink supply port 6 lying from one end of the printing roller 3 to the other end, and with an ink vacuum port 7 in the neighborhood of the end. The ink in a tank 8 is supplied from the ink supply port 6 into the printing roller 3 by means of a pump 9, and the ink flowing out to the edge of the squeegee 5 during printing is sucked from the ink vacuum port 7 by means of a pump 10 and then fed back to the tank 8. The printed pattern on the metallic hand 2 hardens by being exposed to ultraviolet rays when passing through the bottom of an ultraviolet irradiation device 11. Thereafter, the metallic band 2 is rolled up by the take-up reel 12. A substance having resisting property is used for the screen printing ink setting with ultraviolet rays.

Description

[Detailed Description of the Invention] (Industrial Application Field) Copper alloys, stainless steel, etc. are used for the base materials of lead frames, connectors, switches, etc. used in electronic components and electronic devices, but Plating with gold, silver, and other precious metals is essential to ensure complete electrical contact and long-term durability of terminal connections and contacts.Recently, these precious metal platings are required to reduce precious metals and reduce costs. Since then, pattern plating has been performed only on small areas to be bonded or contacted.The present invention relates to a method for forming a fine resist pattern to enable such pattern plating.

[Conventional technology]

Traditionally, substrates to be pattern plated have been supplied to the production process as metal strips, which have been processed in discontinuous manners, but for highly efficient mass production, they have been supplied in the form of long metal strips or hoops. must be fed into a continuous production process.

In order to produce a pattern-plated long-wound metal strip or hoop, a long-wound metal strip base material must be prepared in which the entire front and back surfaces are masked with a metal resist film, leaving only the portion to be pattern plated. Methods for continuously forming such resist patterns include lithographic printing,
Printing methods such as letterpress printing can be considered, but these press printing methods inevitably result in a thin resist pattern, making it difficult to ensure sufficient resistivity.

The screen printing method can form a resist film with sufficient thickness, but since the flat screen printing method, which has traditionally been commonly used to form resist patterns, is a sheet-fed printing method, it is possible to form a resist film with a sufficient thickness. □Not suitable for printing continuous patterns on bands. On the other hand, the rotary screen printing method is used in the field of textile printing, but since the screen plate is made with the purpose of forming a printing film with a thickness of about 100 μm on the fabric, the screen pattern is coarse and fine. It could not be used to form a resist pattern.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a method for continuously forming a fine resist pattern on a long metal strip.

[Means for solving problems]

As a method for achieving the above object, the present invention prints a fine pattern on the surface of a metal strip using a rotary screen printing machine having a screen plate with a mesh number of 130 or more and an ultraviolet curable screen printing ink having resist properties. A method for forming a resist pattern is provided, which comprises exposing a printed pattern to ultraviolet light and curing it.

FIG. 1 is a schematic diagram of an apparatus for carrying out the invention.

The long metal strip (2) unwound from the unwinding reel (1) passes between the plate cylinder (3) and the impression cylinder (4), which rotate in pressure contact with each other. ) on which a predetermined pattern is printed.

The plate cylinder (3) has a cylindrical shape with a screen plate stretched around its circumference, and inside there is a squeegee (5) extending from one end of the plate cylinder (3) to the other end and an ink supply port (6). An ink suction port (7) is provided near the end. Tank (8)
The ink stored in the plate cylinder (3) is supplied from the ink supply port (6) to the inside of the plate cylinder (3) by the pump (9), and the ink flowing out to the end of the squeegee (5) during printing is removed by the pump (9).
The ink is sucked from the ink suction port (7) by the ink tank (
8). The printed pattern printed on the metal strip (2) is exposed to ultraviolet light and cured when passing under the ultraviolet irradiation device (11).

Thereafter, the metal strip (2) is wound up by a take-up reel (12).

UV-curable screen printing inks are used that have various resist properties such as metki resist properties, solder resist properties, and etching resist properties, and can be produced using various known UV-curable raw materials and auxiliary agents. . For example, various polymers or prepolymers such as acrylic, polyester, polyurethane, polyamide, and epoxy-based polymers having at least two or more (meth)acrylic double bonds in one molecule, particularly preferably UV-polymerizable unsaturated double bonds. Ultraviolet polymerizable 7-mer-1 is particularly preferably diluted with a (meth)acrylic monomer, and a well-known sensitizer,
Furthermore, it can be produced by adding a highly compatible non-reactive resin, various auxiliary agents, etc. to the coloring pigment, extender pigment, monomer, and prepolymer as necessary to adjust the viscosity to an appropriate level.

Next, the present invention will be specifically explained with reference to Examples.

Example The following components were kneaded in a three-roll mill to prepare an ultraviolet curable screen printing ink having mesh-resistance properties.

7 Talocyanine pigment 1 part by weight Tartar 15 #2-Ethylanthraquinone (sensitizer) 3 Epoxy ester resin 20 Ultraviolet polymerizable epoxy acrylate resin 35 Trimethylolpropane triacrylate 20 2-Hydroxyethyl methacrylate 5 Flow improvement aid 1 〃 2 for rotary screen printing machine (manufactured by Origin Electric Co., Ltd.)
．． A 155-mesh screen plate with a stripe pattern of 5 m/m and 1 m was attached, and the above ink was applied to the surface of a stainless steel metal strip wound into a coil with a thickness of 0.1 m/m and a width of 100 m/m at a speed of 4 m/min. The printed pattern was then cured with ultraviolet rays to form a hardened resist film in the form of a stripe pattern on the surface of the metal strip.

On the other hand, the back side of the metal strip was printed on the entire surface using a solid screen plate and cured in the same way. The metal strip patterned in this way is subjected to degreasing, chemical polishing, electrolytic activation, and gold plating according to the plating process procedure described in JP-A-56-126206, and then a commercially available methylene chloride-based stripper. *II-yr +-, 1; -y L th
Melancholy? I obtained a plated stainless steel metal body.

〔Effect of the invention〕

As explained above, according to the method of the present invention, it is possible to continuously form a fine resist pattern on a long metal strip, so that it is possible to form a fine resist pattern continuously on a long metal strip. It becomes possible to continuously produce the resist patterns necessary for However, the method of the present invention is not limited to the formation of a resist pattern as described above, and can also be used to form resist patterns for printed wiring boards, as well as the surfaces of various substrates such as metal, plastic, ceramic, glass, and wood. It can also be used to form resist patterns required when processing materials by various physical and chemical means such as plating, etching, honing, coloring, and alteration.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an apparatus for carrying out the method of the present invention, in which (1) is an unwinding reel, (2) is a metal strip, and (3) is an unwinding reel.
is the plate cylinder, (4) is the impression cylinder, (5) is the squeegee, (6) is the ink supply port, (7) is the ink suction port, (8) is the tank, (9) and (10) are the pump, (11) represents an ultraviolet irradiation device, and (12) represents a take-up reel. Agent Patent Attorney Katsutoshi Takahashi

Claims (1)

[Claims] A fine pattern is printed on the surface of the metal strip using a rotary screen printing machine equipped with a screen plate with a mesh number of 130 or more and an ultraviolet curable screen printing ink with resist properties, and this printed pattern is exposed to ultraviolet light and cured. Characteristic resist pattern formation method.