| 摘要 |
The drainage quality of a pulp furnish slurry on a paper machine forming wire is predicted by the drainage tester of this invention by accounting for the effect of drainage through the paper sheet as it forms. The tester can distinguish between fast draining mechanical pulps and slower draining chemical pulps as well as predict the effects various additives will have on drainage. The apparatus includes a screen which separates furnish fibers from the slurry white water in response to a constant volume vacuum pump. Pressure differential as a function of time is recorded producing for any given furnish three distinctive points of inflection on the curve, including a first point of inflection which correlates with the wet line on a paper machine forming wire, second point of inflection which correlates with the dry line on the former and a third point of inflection which correlates with the maximum practicable removal of water from said pad by the typical former vacuum systems.
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