Venting assembly and microporous membrane composite
AssigneeDonaldson Company, Inc.
InventorJacob Sanders
Life of this patent
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Abstract
The technology encompassed by the current disclosure generally relates to membrane composites that can be used in acoustic venting assemblies. In one embodiment of the technology disclosed herein, a venting media composite has a microporous membrane layer and a coating on the microporous membrane layer to form a composite. The basis weight of the composite is at least about 0.5% higher than a basis weight of the microporous membrane layer without the coating. In some embodiments the composite has a decreased insertion loss than its membrane-only counterpart.
Claims27
A venting media composite comprising:
- a microporous membrane layer comprising polytetrafluoroethylene;
- and
- a coating on the microporous membrane layer, wherein the microporous membrane layer and the coating are a composite, wherein the basis weight of the venting media composite is at least about 3% higher than a basis weight of the microporous membrane layer without the coating, and wherein the composite has an average insertion loss less than or equal to the average insertion loss of the microporous membrane layer without the coating in a frequency range from 300 Hz to 4000 Hz.
A composite membrane, comprising
- a microporous membrane;
- and
- a coating on the microporous membrane, wherein the average transmission loss of the composite membrane is at least 10% more than the average transmission loss of the microporous membrane alone in a frequency range from 300 Hz to 4000 Hz, and the average insertion loss of the composite membrane is less than the average insertion loss of the microporous membrane alone in the frequency range from 300 Hz to 4000 Hz.
A venting media composite comprising:
- a. a microporous membrane layer;
- and
- b. a coating on the microporous membrane layer, the coating comprising a chromium-containing metal complex colorant;
- wherein the composite has an average insertion loss less than or equal to the average insertion loss of the microporous membrane layer without the coating in a frequency range from 300 Hz to 4000 Hz.
Dependencies are inferred from the claim text.