Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1997-05-29
1999-09-21
Chin, Peter
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162252, 162258, 73 5303, 73 5304, 36447101, 36447102, G01N 3334
Patent
active
059549220
ABSTRACT:
Method and apparatus are presented for use in a papermaking process for determining permeability and/or compressibility characteristics of a pulp suspension within the process. The method/apparatus includes monitoring height of pulp suspension within one or more test columns as a function of time while allowing pulp suspension drainage from each test column. At least one parameter representative of permeability or compressibility of the pulp suspension is determined, via computer processing, using the monitored height as a function of time of the pulp suspension within the test column. The at least one parameter representative of permeability or compressibility can comprise specific surface area (S.sub.w), specific volume (v.sub.f) compressibility constant m or compressibility constant n for the pulp suspension. Further, a measure of the permeability and/or compressibility characteristic(s) of the pulp suspension attributable to fines in the pulp suspension is obtained using two test columns, each having a different size screen disposed therein to allow different size fibers of the pulp suspension to pass therethrough. The determined parameters are employed as control feedback to the papermaking process for maintaining one or more pulp suspension characteristics near a predefined set point.
REFERENCES:
Ramarao, B.V. and Kumar, P., "A Model for the Gravity Drainage of Papermaking Suspensions", Nordic Pulp and Paper Research Journal, vol. 11, No. 2, pp. 86-94, May 30, 1996.
Wei, H. and Ramarao, B.V., "Characterization of Pulp Slurries Using a Novel Drainage Tester", TAPPI Proceedings, pp. 517-523., Engineering Conference, Oct. 1996.
Unbehend, J.E., "Laboratory Drainage Testers--A Critical Review," Empire State Paper Research Institute, pp. 1-13 (1991).
Andrews, B.D. & White, L.R., "A Constant-Rate Rapid Drainage Tester," Tappi, vol. 52, No. 6, pp. 1171-1175 (1969).
Pires, E.C., Springer, A.M. & Kumar, V., "Computational model for water drainage in fourdrinier paper machines," Tappi Journal, pp. 133-139 (Apr. 1988).
Pires, E.C., Springer, A.M. & Kumar, V., "A new technique for specific filtration resistance measurement," Tappi Journal, p. 149154 (Jul. 1989).
Sampson, W.W. & Kropholler, H.W., "Batch-drainage curves for pulp characterization--Part 1: Experimental,"Tappi Journal, vol. 78, No. 12, pp. 145-151 (1995).
Sampson, W.W. & Kropholler, H.W., "Batch-drainage curves for pulp characterization--Part 2: Modeling," Tappi Journal, vol. 79, No. 1, pp. 151-160 (Jan., 1996).
Raisanen, K, Paulapuro, H. & Maijala, A., "Effect of vacuum level and suction time on vacuum assisted drainage of a paper machine wire section," Appita, vol. 48, No. 4, pp. 269-274, (Aug., 1995).
Gess, J.M., "An Introduction To The G/W Drainage Retention System," Tappi Short Course--Retention and Drainage, pp. 49-52 (1989).
"T 221 su-72--Drainage Time of Pulp," Standards Administrator, TAPPI, Atlanta, GA (2 pages), 1996.
Mantar, E, Co, A. & Genco, J.M., "Drainage Characteristics of Pulp Slurries Under Dynamic Conditions," Journal of Pulp and Paper Science: vol. 21, No. 2, pp. J44-J50 (1995).
Henrik, N., "Determination Of The Filterability Of Cellulose Fibre Suspensions," Svensk Papperstidning, No. 9, pp. 265-272 (1977).
Davis, K.E. & Russel, W.B., "An asymptotic description of transient setting and ultrafiltration of colloidal dispersions," Phys. Fluids A 1(1), pp. 82-100 (Jan. 1989).
Ramarao, B.V. and Kumar, P., "A Model for the Gravity Drainage of Papermaking Suspensions", Nordic Pulp and Paper Research Journal, vol. 11, No. 2, pp. 86-94, May 30, 1996.
Wei, H. and Ramarao, B.V., "Characterization of Pulp Slurries Using a Novel Drainage Tester", TAPPI Proceedings, pp. 517-523, Engineering Conference, (Oct., 1996).
Chin Peter
Leavitt Steven B.
The Research Foundation of State University of New York
LandOfFree
Method and apparatus for determining pulp permeability and compr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for determining pulp permeability and compr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for determining pulp permeability and compr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-76534