JPS60192694A - Screen plate - Google Patents

Abstract

PURPOSE:To enable to print in a high yield, by providing a molybdenum oxide film on a nickel surface, in a metallic mask comprising a nickel plate or a nickel film and used for screen printing. CONSTITUTION:A film of molybdenum oxide having favorable affinity for a molybdenum paste is provided on the surface of a screen. In providing the film, to firmly adhere molybdenum oxide to the Ni surface, a silane coupling agent and a fine powder of MnO3 are first applied to the surface, and then a film of MnO3 is provided. By using the screen plate thus obtained, the yield of printing is enhanced, and the useful life of the screen plate can be prolonged. In addition, the content of the molybdenum powder can be raised, so that shrinkage on sintering and conductor resistance can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a screen plate used for screen printing.

[Background of the invention]

Recently, ceramic wiring boards have been put into practical use as wet-type multilayer wiring boards that allow high-density wiring. As shown in Fig. 1, this wet multilayer wiring board is made by punching through holes 2 in a raw ceramic green sheet 1 formed from ceramic powder and an organic binder, and filling the through holes 2 with conductive paste. After stacking 4 to 50 sheets and crimping them using methods such as hot pressing, 1500 to 1
It is manufactured by sintering at a high temperature of 600°C.

In the above method, W paste is mainly used as the conductive paste. Recently, however, the development of Hanawa paste has been actively promoted both domestically and internationally.

As shown in FIG. 2, when printing pigeon paste 5 on green sheet 1, a Ni metal mask produced by electrohoming or etching is used as screen plate 4. -Mandan paste needs to have a high viscosity of 500,000 to 800,000 cp because it is necessary to fill through holes.

In addition, the thixotropic properties are increased to prevent drying shrinkage. Due to these paste properties, pigeon paste has a high yield value.

Therefore, it is necessary to print with high abrasion stress. When printing such pigeon paste using the Ni metal mask mentioned above, the paste does not blend well with the screen surface. For this reason, during printing, the squeegee With the movement of
Since the paste is simply sliding on the screen, it is difficult for the paste to undergo abrasion stress. Therefore, filling of the conductive paste 5 into the through holes becomes insufficient. (Fig. 5 α) Furthermore, if the viscosity of the paste is lowered to make it easier to generate abrasion stress, there are many drawbacks such as increased printing unevenness and drying shrinkage (Fig. 3 b).

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a screen plate that can print with good walking distance.

[Summary of the invention]

The key point of the present invention is that an acidic substance is formed on the surface of the screen so that it is easily compatible with seaweed paste. The method is to apply a silane coupling agent and MnOs fine powder to the cationic Ni surface in order to form it firmly.
Forms a film of

[Embodiments of the invention]

Specific embodiments of the present invention will be described in detail with reference to FIGS. 4 to 6.

Embodiment 1 FIG. 4 shows an enlarged cross-section of a screen plate 6 manufactured by electrohoming or photoetching. First, after cleaning the surface of the screen plate with isopropyl alcohol and drying it, paste 7 with the following composition.
0.2 to 1 m with a doctor blade on the surface of the screen plate.
Apply to a thickness of mt (a).

Paste composition - cationic oxide containing MrLc and MnOs - 45Of (
Average particle size: 0.5μm) →50 g ・Polyvinyl butyral →0.6t (polymerization degree -20
00) Next, leave it at 20-50°C for 50-55 hours. (In the case of a metal mask stretched and fixed on a screen) In the case of a metal mask before being fixed on a screen plate, leave it in a hot air dryer at 80°C for 4 hours, then remove the molybdenum oxide paste with an organic solvent (such as ethyl acetate). When removed, a purple and colored anodic oxide film 8 is formed (h).The screen plate on which the film has been formed in this way is compatible with pigeon paste;
Printing was possible under normal screen printing conditions.

Example 2 FIG. 6 shows that the metal mask 6 on which the coating 8 according to Example 1 was formed was covered with a stainless steel mesh 10 using epoxy resin 9, and as a result, the adhesive area was smaller than in the conventional method (untreated metal mask). The solvent resistance of the screen plate was improved and the life of the screen plate was increased by 1.5 times.

〔Effect of the invention〕

By using the screen plate of the present invention, the yield of +11 printing is improved.

(2) It is possible to extend the life of the screen plate.

(3) Since the content of seaweed powder can be increased, the resistance of the sintered shrinkage conductor can be reduced.

[Brief explanation of drawings]

Fig. 1 is a sketch of a green sheet for explaining the conventional technology; Fig. 2. FIG. 5 is a schematic printing diagram and a cross-sectional view showing a printing shape for explaining the prior art, and FIGS. 4 to 6 are schematic cross-sectional views of a screen plate for explaining the present invention. 1. Nigeleen sheet 6: Metal mask 2. Varnish through hole/L/7 Paste on dioxide 5: Paste 8. Dioxide coating layer 4. Nigeleen plate 9: Adhesive

Claims (1)

[Claims] A nickel plate or nickel film is formed on the nickel surface in a metal mask used for screen printing.
. A screen plate characterized by forming an oxide film.