On-line web filtration efficiency test method
AssigneeDonaldson Company, Inc.
InventorMark A. Gogins
Life of this patent
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Abstract
An apparatus and method for measuring the filtration efficiency of a moving air-permeable web. The apparatus includes a sampling head with an upstream head and a downstream head disposed on opposite sides of the moving web and spaced apart to define a path for web travel. Particle laden air from the upstream head passes through the moving web and is collected in the downstream head where a sampling probe is disposed to collect filtered air for efficiency measurements. The method can be practice on-line in the media manufacturing process to continuously monitor the filtration characteristics and if necessary change the process condition to maintain the filtration characteristics within design parameters.
Claims15
Apparatus for monitoring the filtration efficiency of an air permeable moving web comprising:
- a sampling head having first and second members disposed on opposite sides of the moving web, each spaced apart from the web and defining a path through which the web travels without contacting said first and second members;
- means for introducing particle laden air into said first member, said first member distributing the particle laden air through the web while the web is moving, said second member collecting the particle laden air passing through the moving web;
- means for determining the efficiency of the removal of particles from the air by the air permeable web.
A sampling head for use in a system for measuring the filtration efficiency of a moving web comprising:
- an upstream head adapted to distribute particle laden air through the web while the web is moving;
- a downstream head adapted to collect the particle laden air passed through the moving web;
- said upstream and downstream heads spaced apart from each other on opposite sides of the web to provide a path through which the moving web travels without contacting either of said heads whereby efficiency measurement is accomplished without a seal between either of said heads and the web.
A method of measuring the filtration efficiency of a moving web of air permeable material comprising the steps of:
- providing a sampling head comprising an upstream head and a downstream head having a sampling probe, said upstream head and downstream head disposed on opposite sides of the web and spaced apart from each other to define a path for the web travel;
- passing the web between the upstream head and downstream head without the web contacting either of said heads;
- distributing particle laden air from the upstream head through the web;
- collecting in the downstream head the air passing through the web;
- determining the efficiency of the removal of particles from the air passing through the web.
Dependencies are inferred from the claim text.