Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1991-09-24
1994-08-23
Jones, W. Gary
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162 49, G01N 1100
Patent
active
053404424
ABSTRACT:
A drainage tester evaluates the reaction pattern of one or more reactions in a paper pulp furnish to predict behavior of the pulp on a paper line. The tester includes a mixing container in which an additive is mixed with the slurry under conditions that prolong the reactions in the container such that they take longer than the same reactions on a paper line. The mixer can also mimic the kinetic conditions (such as mixing by turbulence or passive diffusion) under which the additive is mixed with the furnish on the paper line. A test container has a screen bottom that separates furnish solid from slurry water by developing a pressure differential across the screen. An intermediate container is positioned between the mixing container and test container to provide a constant hydrostatic head on furnish transferred to the test container. A sensor above the screen in the test container monitors changes in the optical characteristics of a sheet formed on the screen to automatically determine the drainage time of the formed sheet. Sequential equal volume aliquots of furnish are withdrawn from the mixing container and sent to the test container at preselected time intervals after chemical additives are mixed with the furnish in the mixing container. Physical characteristics of the sheet, such as fines retention, drainage time and visual appearance, are recorded as a function of time from addition of additive to the mixing container. Behavior of the sheet on the paper line can be predicted in this manner to help an operator efficiently operate a paper machine system.
REFERENCES:
patent: 2734378 (1956-02-01), Meyers
patent: 3402897 (1968-09-01), Willems
patent: 3585106 (1971-06-01), Sepall et al.
patent: 3630636 (1971-12-01), Hill
patent: 3724957 (1973-04-01), Tamate et al.
patent: 4024754 (1977-05-01), Alfthan
patent: 4613406 (1986-09-01), Gess
patent: 4662991 (1987-05-01), Karna et al.
patent: 4708011 (1987-11-01), Rautakorpi et al.
patent: 4891098 (1990-01-01), Renjilian et al.
patent: 4969351 (1990-11-01), Halley et al.
patent: 5026455 (1991-06-01), Lehtikoki et al.
patent: 5090816 (1992-02-01), Socha
Patent Abstracts of Japan, vol. 10, Sep., 1986 & Japanese patent A 61-104257.
PCT International Search Report dated Feb. 2, 1993 for International Application No. PCT/US 92/08116.
Gess, Proceedings, Tappi Papermaking Conference, Portland, Oreg., 185-189 (1983).
Gess, Notes, Tappi Retention and Drainage Seminar, 77-81 (1983).
Gess, Tappi, Advanced Topics in Wet End Chemistry Short Course, Memphis, Tenn. (1987).
Gess, Tappi, Retention and Drainage Short Course, 49-52 (1989).
Gess, Preprints, Tappi Annual Meeting, A27-A32 (1989).
Adams Terry N.
Gess Jerome M.
Martz Russell J.
Petersen Dennis E.
Jones W. Gary
Lamb Brenda
Weyerhaeuser Company
LandOfFree
Evaluating furnish behavior does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Evaluating furnish behavior, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evaluating furnish behavior will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-500299