| 摘要 |
1374468 Metal gauze PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 26 Oct 1971 [29 Oct 1970] 49675/71 Heading D1K [Also in Divisions B3 B6 C7 and G2] In a method of manufacturing a silk-screen printing mask which consists of a metal wire gauze whose meshes outside a pattern to be printed by the mask are closed by a metal design, bonded to the gauze, a metal coating is applied to a support the adhesion between the coating and the support being. so poor that the support can be readily separated from the metal coating, a metal design in a negative of the pattern is applied onto the metal coating, then the support bearing the coating and design is placed on a piece of wire gauze so that the design is in contact with the gauze, the assembly is heated for such a time and at such a temperature that the metal design is bonded to the wire gauze as a result of diffusion, the support is removed from the assembly and the metal coating is removed from the silk screen printing mask. In the particular example, chromium or a chromium-nickel alloy was vapour-deposited in a layer on a flat copper plate and the layer then oxidised. This formed the support. A second layer of similar composition forming the metal coating was deposited on the oxidised layer by cathode sputtering or vapour deposition. A photoresist layer in a "positive" of the pattern was applied thereto and then a nickel layer and subsequently a copper layer were electro-deposited on the exposed metal coating to form the metal design and the photoresist was removed. The support coating and design were laid on a wire gauze of copper plated chromium-nickel steel and heated for 1 hour at 800‹C in' a hydrogen atmosphere until bonding took place after which the plate was removed and subsequently the metal coating removed from the design. |
