Importance

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Abstract

The invention relates to an apparatus and a method for determining the drainability by permeability measurements. The apparatus is provided for taking a sample of a suspension, particularly a fibre suspension, e.g. such as flows in a pipe (2), said apparatus including a sampling piston housing (4) connected to the pipe (2) and accommodating a sampling piston (5) which can be displaced into the pipe (2) and has a through hole for forming a sample chamber (9) for taking out a pulp sample. The housing (4) is in communication with a dilution and mixing chamber (35) including an agitation or mixing device (36), the lower portion of the chamber (35) being closed off by an end member (23) with a screening plate (22). In the method in accordance with the invention there first takes place measurement on the entire pulp sample, subsequent to which the sample is liberated from its fine fraction by a washing process in the mixing chamber (35), measurement on the proportion of fibre in the pulp sample then taking place, for which purpose the permeability of the pulp bed formed against the screening plate (22) is measured during one or more pressure drops, possibly with intermediate slushing with the aid of the mixing device (36) and reformation of the pulp bed.

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First Claim