Wire mesh selection: Printed panels are generally selected from 180 to 240 mesh screens. When the character and key frame of the printing panel have contour outline requirements, a screen with a slightly higher number of meshes may be selected, but not more than 300-500 mesh. .
Printed silver paste contacts, generally use 180-240 mesh screen. The conductive silver paste is a mixture of fine particles of metallic silver with good conductivity and a conductive resin and a solvent. The silver pastes of different manufacturers have different sizes of metal silver particles, solid silver metal contents and shapes. Metal silver particles are the main components that determine the resistance of a switch circuit. When printing the conductor circuit, try to let the particles of conductor silver pass through the screen smoothly. Therefore, the mesh number of the selected screen should not be too fine. Although the thin screen is printed with straight lines, it can be printed with a good-looking circuit pattern, but in the microscopic state, it is only a loose structure, and the metallic silver particles have a small solid content, which is due to Most of them failed to pass the wire mesh. Such a pattern not only has a large resistance, but also has a disadvantageous effect on the current and the life of the wire and cannot be used for practical applications.
Platemaking methods: direct method, indirect method, straight-line method can be used. Printed panels are mostly made of straight-line legal plates; printed contacts and circuits can be indirectly or directly made by law. In general, indirect methods can be used for the 3rd photosensitive film plate making. Exposure is sufficient during plate making to reduce film loss and improve edge sharpness. The film thickness is thick and the ink layer can be thick. The thick conductive ink layer is a prerequisite for improving conductivity and reducing resistance.
Source: hc360 Huicong Print Channel
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