High temperature polymer filtration medium
AssigneeBHA Group Holdings, Inc.
InventorAlan Smithies
Life of this patent
Estimating the term…
Abstract
A filter medium for use in particulate filtering applications is disclosed. The filter medium is formed from a substrate capable of retaining the desired physical structure of the filter medium under the conditions of the filtering application, including temperature. A polyimide based stiffening agent adapted for treating the substrate is also provided.
Claims21
a method of making a filter medium for use in a filtering application at an application temperature comprising:
- providing a substrate;
- providing a polyimide stiffening agent;
- treating the substrate with the polyimide stiffening agent;
- and
- curing the treated substrate, wherein the treated substrate with the polyimide stiffening agent is capable of withstanding at least 100,000 cleaning pulses at the application temperature.
A method of making a filter medium for use in a filtering application at an application temperature comprising:
- providing a polymer substrate;
- calendering the polymer substrate;
- providing a polyimide stiffening agent;
- treating the calendered polymer substrate with the polyimide stiffening agent;
- and
- curing the treated polymer substrate, wherein the treated polymer substrate with the polyimide stiffening agent is capable of withstanding at least 100,000 cleaning pulses at the application temperature.
A method of making a filter medium for use in a filtering application at an application temperature comprising:
- providing a substrate;
- calendering the substrate;
- providing a polyimide stiffening agent;
- treating the calendered substrate with the polyimide stiffening agent;
- curing the treated substrate;
- and
- pleating the treated substrate at a temperature that is higher than the application temperature.
Dependencies are inferred from the claim text.