PRODUCTION OF ELEMENT FOR MULTI-TONAL WATERMARK FORMATION, ELEMENT FOR MULTI-TONAL WATERMARK FORMATION AND APPLICATION OF SAID ELEMENT FOR MULTI-TONAL WATERMARK FORMATION

摘要

FIELD: process engineering.;SUBSTANCE: invention relates to making of element for formation of multi-tonal watermark in the carrier by draining of fibre suspension. Note here that said element has pattern on one of its surfaces referred to as shaped surface opposite the draining surface and perforation. Note also that said perforation comprises through channel with inlet in perforated surface and outlet at draining surface. Proposed process comprises steps including the forming of said pattern and said perforations at said element so that every perforation is configured to make its channel cross-section are at definite spacing wherefrom depends directly on said spacing. Note that said element is subjected to ay least one annealing step. Invention relates to the element made as described above and to application of said element in formation of watermark.;EFFECT: higher efficiency of the process.;17 cl, 6 dwg, 1 tbl