Device to test the permeability to air of two-dimensional articles, in particular, of felts and screens used in machines and installations for manufacturing paper

Abstract From the Canadian patent

There is provided a new and useful device for testing the air permeability of an article, and particularly felts and screens associated with the manufacture of paper products the device being, of the type including a measuring channel through which air is propelled through utilization of a blower mechanism and including, measuring means for measuring the flow rate of air within the measuring channel, the air being propelled through a measuring area of the exposed surface of the article as a function of a controlled constant pressure difference created at the adjacent measuring area, the device further being of the type including a longitudinal positioned belt channel juxtaposed about the …