G C 2070 Lecture Notes - Lecture 2: Flexography, Static Cling, Photographic Emulsion
18 Sep 2017
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Document Summary
Stencil systems; function of stencil: blocks ink in non image area, allows ink to pass through in image area, provides edge definition. Liquid emulsion coated directly on screen; most durable, long runs. Modern, automatic coaters used in many high quality facilities. Makes a gasket seal for fine details, edge definition. Emulsion on plastic support sheet, used for fine detail, not as durable for long runs. Can"t be used on rough meshes, won"t adhere. Exposed, developed, washed out, adhered to screen, base removed after drying. Combines fine print quality of capillary with durability of direct which surrounds the thread with emulsion. Film backing adhered to screen, then photo emulsion is poured on the other side and allowed to seep through the screen to create a uniform thickness. The regular patterns of the dots and the mesh can cause moire. We need a ratio of mesh to dots that will minimize it.
