System for preparing rotary silk-screen printing stencil for printing - involves application of photosensitive coating, drying, pattern-wise exposure, development and hardening

摘要

The process comprises the steps of applying a patterned sealing coating to the stencil and fixing end rings in the stencil in order to be able to incorporate it in a printing machine. Starting from an uncoated stencil, the end rings are first fixed and the patterned sealing coating is then formed by coating the stencil with a layer of a suitable photographic lacquer, drying and patterned exposure thereof and developing and hardening. The end rings (7;32) greatest external diameter is smaller than the external diameter of the stencil in question are used. For the application of the coat of photographic lacquer the stencil is accommodated between two suporting rings (21), which can each accommodate an end (7;32) at one end on the inside. During the coating one or more coats of a liquid photographic lacquer are applied to the outside of the stencil, possibly with intermediate drying, and using a sealing collar (22) lying against the stencil.