Focused Beam Reflectance Measurement (FBRM) a promising tool for wet-end optimisation and web break prediction
article
The trends to increased speed and higher qualities have increased the need for wet-end control - especially for systems with on-line measuring devices and feed forward control. One possibility is the use of Focused Beam Reflectance Measurement (FBRM) to measure on-line particle counts and their dimensions in (high concentration) suspensions. This paper describes the use of FBRM for: i) wet-end optimisation at an uncoated woodfree paper-mill; and ii) web break prediction at a corrugated board mill. At the woodfree mill, the aim was to analyse and stabilise the wet end to improve runnability and reduce downtime. The FBRM was used to determine the chord length distributions of both pulp and white water; to evaluate fixation and retention agents and to determine the retention on a hand sheet. It was also possible to chart and monitor the complete wet-end section of the mill. At the board mill FBRM was used to analyse the relation between measured water parameters and variations in process and product quality. FBRM showed a relation between the amount of particles in the white water and web breaks - it seems that web breaks can be predicted by measuring the amount of small particles with the FBRM.
Topics
TNO Identifier
236051
ISSN
0306252X
Source
Paper Technology, 42(4), pp. 39-44.
Collation
6 p.
Place of publication
Delft
Pages
39-44
Files
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