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

G - Physics

01

N

G01N 33/46 (2006.01) G01N 33/34 (2006.01) G01N 1/10 (2006.01) G01N 1/18 (2006.01) G01N 1/20 (2006.01) G01N 1/28 (2006.01)

Patent

CA 2065419

2065419 9106004 PCTABS00005 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.

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