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1. (WO1991006004) APPARATUS FOR DETERMINING DRAINAGE TIME OF PAPERMAKING STOCK
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/006004 International Application No.: PCT/US1990/005186
Publication Date: 02.05.1991 International Filing Date: 13.09.1990
Chapter 2 Demand Filed: 15.04.1991
IPC:
G01N 1/10 (2006.01) ,G01N 1/18 (2006.01) ,G01N 1/20 (2006.01) ,G01N 1/28 (2006.01) ,G01N 33/34 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
1
Sampling; Preparing specimens for investigation
02
Devices for withdrawing samples
10
in the liquid or fluent state
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
1
Sampling; Preparing specimens for investigation
02
Devices for withdrawing samples
10
in the liquid or fluent state
18
with provision for splitting samples into portions
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
1
Sampling; Preparing specimens for investigation
02
Devices for withdrawing samples
10
in the liquid or fluent state
20
for flowing or falling materials
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
1
Sampling; Preparing specimens for investigation
28
Preparing specimens for investigation
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33
Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
34
Paper
Applicants:
WEYERHAEUSER COMPANY [US/US]; Tacoma, WA 98477, US
Inventors:
HALLEY, David, G.; US
GESS, Jerome, M.; US
Agent:
CRAWFORD, John, M. ; Patent Department CH 2J29 Weyerhaeuser Company Tacoma, WA 98477, US
Priority Data:
421,91616.10.1989US
Title (EN) APPARATUS FOR DETERMINING DRAINAGE TIME OF PAPERMAKING STOCK
(FR) APPAREIL PERMETTANT DE DETERMINER LE TEMPS DE DRAINAGE DE PATE POUR LA FABRICATION DU PAPIER
Abstract:
(EN) The invention is an apparatus and method for measuring drainage time of a papermaking stock suspension (62). The apparatus will automatically measure drainage times of a plurality of samples which will preferably be of differing basis weights. It consists of a sheet mold reservoir (10) and dropleg (26) which index against or away from a table (12) having spaced apart sheet forming locations (14). Operation of the apparatus is determined by a programmable controller which causes stock to be automatically transferred to the sheet mold and the reservoir and dropleg to be automatically and appropriately positioned. After a sheet is formed, the table automatically indexes to the next forming position where the cycle is repeated. The method involves plotting a series of at least three points to determined the slope of drainage time versus the basis weight of the sheets formed. This can be used as an indicator of the drainage characteristics of a stock of given basis weight on the forming section of a paper machine.
(FR) L'invention concerne un appareil et un procédé pour mesurer le temps de drainage d'une suspension de pâte à papier (62). L'appareil mesure automatiquement les temps de drainage d'une pluralité d'échantillons qui sont, de préférence, de poids de base différents. Ledit appareil comprend un réservoir de moule de feuilles (10) et une colonne barométrique (26) qui se placent contre une table ou s'éloignent de celle-ci (12), ladite table étant dotée d'emplacements de formation de feuilles espacées (14). Un contrôleur programmable commande l'opération de l'appareil, en faisant transférer automatiquement de la pâte au moule de feuille, et en positionnant automatiquement et convenablement ledit réservoir et ladite colonne barométrique. Lorsqu'une feuille est réalisée, la table se déplace automatiquement vers la position de formation suivante où le cycle se répète. Le procédé comprend le traçage d'une série d'au moins trois points de manière à déterminer la pente du temps de drainage par rapport au poids de base des feuilles ainsi réalisées. On peut ainsi obtenir, sur la section de formation d'une machine à papier, un indicateur des caractéristiques de drainage de pâte à papier d'un poids de base donné.
Designated States: AT, CA, FI, JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
FI921350EP0495800CA2065419