Apparatus for determining the air permeability of a cloth web

Details Apparatus for determining the air permeability of a cloth web Apparatus for determining the air permeability of a cloth web

1994-02-04

1995-05-09

Williams, Hezron E.

Measuring and testing

With fluid pressure

Porosity or permeability

73 377, G01N 1508

Patent

active

054129761

ABSTRACT:
For continuous measurement of the air permeability of a moving or stationary cloth web, the latter is guided over a measuring orifice which opens at the end of a measuring tube through a convexly curved outer surface of a measuring head. This convexly curved surface deflects the web. As a result of the tensile stress in the web, the web thereby automatically sealingly clings to this surface around the measuring orifice. In the measuring tube, air is sucked by a pump through the web part extending across the measuring orifice. The flow speed of the air sucked through a test sample is measured in a flowmeter, is indicated as the air permeability of the test sample by an indicator instrument, and if appropriate is used for regulation.

REFERENCES:
patent: 3059466 (1962-10-01), Urmenyi
patent: 3115037 (1963-12-01), Forrester
patent: 3371518 (1968-03-01), Keyes
patent: 3439536 (1969-04-01), Cushman
patent: 4246775 (1981-01-01), Stultz
patent: 4311037 (1982-01-01), Gotchel et al.
patent: 4495796 (1985-01-01), Hester et al.

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