JP4314969B2 - Screen printing plate manufacturing method - Google Patents

Description

  The present invention relates to a screen printing plate used for screen printing of an electrode of an electronic component and the like and a manufacturing method thereof, and more particularly to a screen printing plate used for forming a fine electrode figure and a manufacturing method thereof.

  Screen printing is a method for forming an electrode figure by printing and applying an electrode paste to an electronic component or the like. The screen printing plate used in this screen printing is generally manufactured as follows.

  First, a braid made of a synthetic fiber such as stainless steel metal, polyester, or nylon is prepared. Next, nickel or the like is coated on the ridge by, for example, an electroplating method, a chemical plating method, a vacuum deposition method, or the like, to produce a screen mesh. Next, this screen mesh is stretched around a rectangular metal plate frame to form a desired figure on the surface of the screen mesh. The figure is formed by applying a photosensitive resin with a predetermined thickness on the surface of the obtained screen mesh, irradiating it with ultraviolet rays using a mask on which the desired figure is formed, and developing it. .

  The screen printing plate produced in this way is used for screen printing. For example, this screen printing plate is placed on a printing medium such as a ceramic green sheet, electrode paste is supplied onto the screen printing plate, and a squeegee is slid. Then, electrode paste is deposited on the ceramic green sheet through the opening of the figure. As a result, a desired electrode pattern is formed on the ceramic green sheet.

  However, there is a problem that the speed of separating the plate with respect to the printing pressure when the squeegee slides differs between the center of the screen printing plate and the outer peripheral portion close to the plate frame. The closer to the center, the slower the plate separation speed becomes, so that the electrode pattern formed at the center of the arranged printed material becomes more blurred in printing, and as a result, the printing line width becomes thicker. In particular, when an attempt is made to form fine electrode figures, a slight unintentional misalignment of the printed line width leads to a loss of product reliability and quality.

Therefore, in order to solve such a problem, Patent Document 1 proposes a combination screen printing plate that averages the deflection of the entire screen mesh by combining a plurality of screen meshes having different stretchability. Specifically, the outer periphery of the screen mesh 1 having a large elasticity is fixed to the rectangular frame, the screen mesh 2 having a smaller elasticity than the screen mesh 1 is disposed inside, and the outer periphery of the screen mesh 2 is the screen. The screen printing plate is characterized by being fixed to the mesh 1 with an adhesive.
JP 2000-177099 A

  However, even if the screen printing plate disclosed in Patent Document 1 is used, the bending differs depending on the location within the range of the screen mesh 2, and the speed of separating the plate is different. In order to cope with this, if it is attempted to eliminate the difference in bending by further combining screen meshes having different elasticity from three and four, the process for producing the printing plate itself becomes complicated. Moreover, unless the slicing is made considerably, the speed of separating the plates cannot be made substantially equal, so that the production itself is difficult.

  Accordingly, an object of the present invention is to provide a screen printing plate and a method for producing the same that can solve the above-described problems.

The present invention provides a step of preparing a cocoon made of metal fibers braided at equal intervals with substantially the same thickness, and a shield having a plurality of holes whose opening areas increase from the outer peripheral portion toward the center. A step of preparing a plate, and the soot as a cathode and a metal as an anode are immersed in an electrolyte solution, and the shield plate is disposed between the soot and the metal, and then a current is passed between the electrodes to It kicked toward the method for manufacturing a screen printing plate characterized by having a step of forming a plating film.

According to the method for producing a screen printing plate of the present invention, the change in the area of the opening of the screen mesh can be easily formed by electrolytic plating using a shielding plate having a hole.

  FIG. 1 is a perspective view of a screen printing plate according to an embodiment of the present invention.

  The screen printing plate 10 includes a plate frame 1 and a screen mesh 4. The screen mesh 4 includes an area in which a graphic is actually printed (print area 2) and an unprinted area (non-print area 3) located outside the print area among all areas corresponding to locations where the printing medium is disposed. And divided.

  The plate frame 1 has a rectangular shape made of a metal such as aluminum. The screen mesh 4 is stretched around the plate frame 1.

  The screen mesh 4 is formed by forming a nickel plating film by electrolytic plating on a heel braided with mesh wires using stainless metal fibers. The screen printing plate 10 is obtained by applying a photosensitive resin on the screen mesh 4 and overlaying an image original plate (mask) on which a desired printed pattern is drawn, and exposing the non-photosensitive portion with water or an alkaline aqueous solution. It is produced by dissolving and developing. In FIG. 1 and FIGS. 2 to 3 to be described later, in order to explain the characteristic part of the present invention, the screen mesh 4 at the stage where the plating film is formed is shown, and the printed figure is omitted from the drawing.

  FIG. 2 is a plan view of the screen printing plate 10 of FIG. FIG. 3 is an enlarged view of three extracted portions 5 in the printing area 2 of FIG. 2, and the outer peripheral portion is extracted as 5 a, the center is 5 c, and the portion positioned therebetween is extracted as 5 b. According to FIG. 3, the extracted portions 5 a to 5 c intersect with mesh lines 6 a to 6 c formed by plating films on stainless steel metal fibers braided at equal intervals, and openings 7 a to 7 c divided by the intersection I know that there is. Further, it is shown that the plated mesh lines 6a to 6c become thicker toward the center of the printing region 2, that is, in the order of 6a, 6b, and 6c. Since the stainless metal fibers that are the materials of the mesh lines 6a to 6c have substantially the same thickness, the difference in the thickness of the entire mesh line is caused by the difference in the thickness of the plating film. Further, it is shown that the area of the openings 7a to 7c is also reduced in the order of 7a, 7b, and 7c toward the center of the print region 2, that is, 7a, 7b, and 7c. The amount of printing bleeding increases in the order of the openings 7a, 7b, and 7c in which the plate separation speed becomes slow. On the other hand, since the opening area decreases in this order of 7a, 7b, and 7c, the amount of printing bleeding increases. Is suppressed. From such a relationship, the widths of the printed lines formed through the openings 7a to 7c are substantially equal.

  In this embodiment, the area of the opening 7 is adjusted according to the thickness of the plating film. However, instead of the plating film, the metal fiber itself may be thicker as it passes through the center of the screen printing plate. In the present embodiment, the metal fibers having the same thickness are braided at equal intervals, but the area of the opening 7 may be adjusted by narrowing the interval as it passes through the center of the screen printing plate. Furthermore, in this embodiment, stainless steel fibers are used as the material, but nylon or polyester may be used as long as the electrolytic plating method is not used, and the material is not limited.

  Next, in the manufacturing method of the screen printing plate 10 shown in Example 1, a process of forming a plating film on the ridge by an electrolytic plating method will be described in particular.

  FIG. 4 is a plan view of the shielding plate 21 used during electrolytic plating. The shielding plate 21 is a plate-like member 22 made of, for example, vinyl chloride, provided with a plurality of holes 23 whose opening area increases toward the center.

  FIG. 5 is a schematic cross-sectional view of an electroplating apparatus 60 using the shielding plate 21. In a nickel plating solution 61, which is an electrolytic solution, a rod 65 made of stainless steel metal fiber as a cathode and a nickel metal 62 made of an anode are immersed, and the shielding plate 21 is disposed therebetween. The eaves 65 and the shielding plate 21 are spaced apart by about 2 to 3 cm. When a current is supplied from the DC power source 63 in such a state, the nickel ions 64 in the nickel plating solution 61 are attracted and moved by the cage 65, and the nickel ions 64 and the electrons supplied from the DC power source 63 on the surface of the cage 65. Are bonded to each other, so that nickel is deposited and a plating film is formed.

  At this time, since the shielding plate 21 having the holes 23 having different opening areas is disposed in front of the flange 65, the thickness of the plating film varies depending on the location of the flange 65. In the outer peripheral portion of the ridge 65, a small hole 23 exists in the opposing shielding plate 21, and the degree of shielding the movement of the nickel ions 64 toward the ridge 65 is increased, and the plate is thinly plated. It will be. On the contrary, in the center of the ridge 65, a large hole 23 exists in the surface of the opposing shielding plate 21, and the degree of shielding the movement of the nickel ions 64 is low, and the plating is thicker than the outer peripheral portion. .

  Thus, the screen mesh 4 coated with plating films having different thicknesses as shown in FIG. 3 can be produced according to the opening distribution of the holes 23 of the shielding plate 21.

1 is a perspective view of a screen printing plate 10 of the present invention. 1 is a plan view of a screen printing plate 10. FIG. FIG. 3 is an enlarged view of three excerpt portions 5 in the print area 2 of FIG. 2. It is a top view of the shielding board 21 used at an electroplating process. 2 is a schematic cross-sectional view of an electroplating apparatus 60 using a shielding plate 21.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate frame 2 Printing area 3 Non-printing area 4 Screen mesh 5, 5a-c Excerpt part in printing area 2, 6, 6a-c Mesh line 7, 7a-c Opening part 10 Screen printing plate 21 Shielding plate 22 Plate-shaped member 23 hole 60 electroplating apparatus 61 nickel plating solution 62 nickel metal 63 DC power supply 64 nickel ion 65 紗

Claims (1)

Preparing a cocoon made of metal fibers braided at substantially the same thickness and at equal intervals;
Preparing a shielding plate having a plurality of holes having an opening area that increases from the outer periphery toward the center; and
A step of immersing a metal used as a cathode and a metal used as a cathode in an electrolytic solution, disposing the shielding plate between the metal and the metal, and passing a current between both electrodes to form a plating film on the metal. A method for producing a screen printing plate, comprising:

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