Apparatus for determining drainage time of papermaking stock

Details Apparatus for determining drainage time of papermaking stock Apparatus for determining drainage time of papermaking stock

1989-10-16

1990-11-13

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

G01N 3334

Patent

active

049693514

ABSTRACT:
The invention is an apparatus and method for measuring drainage time of a papermaking stock suspension. 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 and dropleg which index against or away from a table having spaced apart sheet forming locations. 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 determine 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.

REFERENCES:
patent: 2602325 (1952-07-01), Campbell et al.
patent: 2734378 (1956-02-01), Meyers
patent: 4024754 (1977-05-01), Alfthan
patent: 4613406 (1986-09-01), Gess
patent: 4708011 (1987-11-01), Rautakorpi et al.

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