Paper making and fiber liberation – Apparatus – Measuring – testing – inspecting – indicating or illuminating
Patent
1991-12-10
1994-05-24
Alvo, Steve
Paper making and fiber liberation
Apparatus
Measuring, testing, inspecting, indicating or illuminating
162351, 73 6162, 73 6164, 73 6167, D21C 700, G01N 1100
Patent
active
053145810
ABSTRACT:
An apparatus and method to simultaneously evaluate the drainage, retention and formation characteristics of paper pulp comprising mixing the paper pulp furnish in the top chamber of the apparatus, releasing the furnish into a middle chamber via a valve having a cone shaped structure for even distribution of the furnish onto a wire screen, and utilizing a time delay before opening a vent valve in order to attenuate impingement forces. The apparatus utilizes a rotating blade under the wire screen to duplicate the pulsation forces of full scale papermaking equipment, an externally applied means to assist in the removal of water similar to a paper machine couch roll. Data generated during the foregoing steps is fed into a computer to evaluate the entire free water drainage process of the furnish. The device is able to set parameters to simulate the water removal process on most paper machines via level control and duration of pertinent variables.
REFERENCES:
patent: 4838996 (1989-06-01), Kallmes
J. E. Unbehend, "Laboratory Drainage Testers-A Critical Review", TAPPI, 1990, pp. 363-375.
K. W. Britt & J. E. Unbehend, "New Methods For Monitoring Retention", TAPPI vol. 59, No. 2, pp. 67-70, Feb. 1976.
Hobirk Richard A.
Lin John T.
Schellhamer Alan J.
Schuster Michael A.
Alvo Steve
Betz PaperChem Inc.
Hill Gregory M.
Ricci Alexander D.
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