[KSCI] Korea Science Citation Index Service

Development of On-line Technology for Measuring Stock Consistency Using Optical Sensor (Part 1) - A study on the relationship between the turbidity and transmittance of stocks and their consistency -

Lee Hak-Lae (Dept. of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Lee Ji-Young (Dept. of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
Youn Hye-Jung (Dept. of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)

Publication Information

Journal of Korea Technical Association of The Pulp and Paper Industry / v.38, no.1, 2006 , pp. 9-15 More about this Journal

Abstract

To develop an efficient and cost effective on-line method to determine the stock consistency a study on the relationship between the turbidity and transmittance of stocks and their consistency was carried out using a system consisted of a dynamic drainage jar, pump and turbidometer. Results shooed that the wavelength of 525 nm was most effective for measuring turbidity. As the consistency increases the turbidity increases, and their relationship can be depicted in the second order equations. On the other hand the relationship between consistency and transmittance can be described in exponential equations. From these equations the consistencies of stock samples can be determined using the measured values of turbidity or transmittance.

Keywords

on-line measurement; consistency; turbidity; transmittance; optical sensor; pulp slurry; filler;

Citations & Related Records

Reference

1	Lancaster, E.P., Retention: definitions, methods, and calculations, in 'Retention of Fines and Fillers During Papermaking', Gess, J.M.(Ed.), TAPPI Press, pp.3-10 (1998)
2	Jansson, I., et al. (Ed.), Accurate consistency, BTG Pulp and Paper Technology AB., pp. 9-31 (1999)
3	Shallhorn, P.M. and Karnis, A., Method and apparatus for on-line monitoring of specific surface of mechanical pulps, U.S. Patent 4,441,960 (1984)
4	Ostroot, G.F., The Consistency Control Book, TAPPI Press, pp.16-29 (1993)
5	Wood, J.R. and Karnis, A., Determination of specific surface area of mechanical pulp fines from turbidity measurements, Paperi Ja Puu-Paper and Timber 78(4):181-186 (1996)