Venting assembly and microporous membrane composite

Patent metadata

Field	Value
Publication number	US-9317068-B2
Application number	US-201313839046-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Sep 24, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

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.

First claim

I claim:

1. 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.

2. The composite of claim 1 , wherein the composite is configured to be coupled to an electronics enclosure about an opening defined in the enclosure.

3. The composite of claim 1 , further comprising an oleophobic coating.

4. The composite of claim 1 , wherein the composite has porosity of greater than 25%.

5. The composite of claim 1 , having an average insertion loss of less than or equal to 85% of the average insertion loss of the microporous membrane layer alone in the frequency range from 300 Hz to 4000 Hz.

6. The composite of claim 1 , having an average insertion loss of no more than 80% of the average insertion loss of the microporous membrane layer alone in a frequency range from 300 Hz to 4000 Hz.

7. The composite of claim 1 , wherein the coating comprises a colorant.

8. The composite of claim 7 , wherein the colorant comprises a metal complex dye.

9. The composite of claim 7 , wherein the colorant comprises chromium.

10. The composite of claim 7 , wherein the composite is black.

11. The composite of claim 10 , wherein the colorant does not include carbon black.

12. The composite of claim 1 wherein the coating comprises one of the group of a clear resin, a binder and a polymer.

13. The composite of claim 1 wherein a basis weight of the venting media composite is at least about 15% higher than a basis weight of the microporous membrane layer without the coating.

14. The composite of claim 1 wherein when the composite is configured to be installed in an opening in an enclosure, the enclosure can withstand immersion in 1 meter of water for 30 minutes without the composite allowing the ingress of water.

15. 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.

16. The composite membrane of claim 15 , configured to be coupled to an electronics enclosure about an opening defined in the enclosure.

17. The composite membrane of claim 15 wherein the average transmission loss of the composite membrane is at least 50% more than the average transmission loss of the microporous membrane alone in the frequency range from 300 Hz to 4000 Hz.

18. The composite membrane of claim 15 , wherein the average insertion loss of the composite membrane is no more than 80% of the average insertion loss of the microporous membrane layer alone in the frequency range from 300 Hz to 4000 Hz.

19. The composite membrane of claim 15 , wherein the coating comprises a colorant.

20. The composite membrane of claim 19 , wherein the colorant comprises a metal complex dye.

21. The composite membrane of claim 19 , wherein the colorant comprises chromium.

22. The composite membrane of claim 15 wherein the coating comprises one of the group of a clear resin, a binder and a polymer.

23. The composite membrane of claim 15 wherein a basis weight of the composite membrane is at least about 0.5% higher than a basis weight of the microporous membrane layer without the coating.

24. The composite membrane of claim 15 wherein when the composite membrane is configured to be installed in an opening in an enclosure, the enclosure can withstand immersion in 1 meter of water for 30 minutes without the composite membrane allowing the ingress of water.

25. 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.

26. The composite of claim 25 , configured to be coupled to an electronics enclosure about an opening defined in the enclosure.

27. The composite of claim 25 wherein when the composite is configured to be installed in an opening in an enclosure, the enclosure can withstand immersion in 1 meter of water for 30 minutes without the composite allowing the ingress of water.

Assignees

• Donaldson Co Inc

Inventors

• Sanders Jacob

Classifications

• B01D53/228

  characterised by specific membranes · CPC title

• B01D67/0095

  Drying · CPC title

• B01D71/36

  Polytetrafluoroethylene · CPC title

• H04R1/023

  Screens for loudspeakers · CPC title

• B01D2325/20

  Specific permeability or cut-off range · CPC title