D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
341/35, 8/78
D21C 9/10 (2006.01)
Patent
CA 1221205
Abstract of Disclosure The invention concerns a procedure and apparatus for controlling the cellulose bleaching process, there being formed on the basis of optical measurement a control signal corresponding to the degree of bleaching of the pulp, and the dispensing of bleaching chemicals to the pulp being controlled by said control signal. The aim is to avoid overdosage and underdosage of the bleaching chemicals. As taught by the invention, from the bleached pulp is determined the residual content of the chemicals employed toward bleaching, on the basis of this determination is formed a correction signal and the control signal is corrected by said correction signal The residual chemicals determination is made possibly from an earlier, or from the same process step in which the control signal is formed, how- ever advantageously from the process step following after the forming of the control signals suitably about 3-10 min., prefer- ably about 5 min. after the optical measurement. The corresponding apparatus for controlling the cellulose bleaching process comprises an optical measuring means (1) for forming a control signal cor- responding to the degree of bleaching of the pulp that is being bleached, a control means (2,3) for controlling the dispersing of bleaching chemicals under control by the control signal with the aid of dispensing means (4,5), and an analyser (6) for determining the residual content of the chemicals used towards bleaching and for forming a corresponding correction signal; this signal having been conducted to correct the control signal. The analyser (6) has been connected to the preceding or the same process step with the optical measuring means (1), advantageously however to the process step following after the optical measuring means.
416373
Bereskin & Parr
Kajaani Oy
LandOfFree
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