Method and device for measuring the permeability of a drying...

Details Method and device for measuring the permeability of a drying... Method and device for measuring the permeability of a drying...

G - Physics

01

N

G01N 15/08 (2006.01) G01N 7/02 (2006.01)

Patent

CA 2188488

A method and device for measuring the permeability of a drying wire to air in which the measurement is carried out continuously while the drying wire moves. The drying wire is guided to run so that it passes over a blow box and a measurement box free of contact, and the pressure in the measurement box and/or the relative change in the pressure is/are measured when the blow box is creating a pressure differential between the blow box and the measurement box in the vicinity of the wire. The pressure and/or the relative change in the pressure is/are compared with earlier measurement results and/or starting values (reference values). The permeability to air of the drying wire is determined on the basis of comparison of the pressure and/or of the relative change in the pressure, and the contact-free measurement is produced by guiding the flow into or out of the measurement box to pass through a gap between the measurement box and the drying wire.

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