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1. (US20090031899) Volatile Substance Filter
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims

1. A volatile substance filter comprising volatile substance adsorber material on support surfaces extending in a direction of gas flow through the filter.
2. A filter as claimed in claim 1, wherein the support surfaces are parallel to the direction of gas flow.
3. A filter as claimed in claim, wherein the adsorber material support surfaces are formed from plastics material.
4. A filter as claimed in claim 3, wherein the support surfaces are of thin cross section.
5. A filter as claimed in claim 4, wherein the support surfaces are 0.05 to 0.3 mm thick.
6. A filter as claimed in claim 4, wherein the support surfaces are 0.1 mm thick.
7. A filter as claimed in any one of claims 1 to 6, wherein the support surfaces are in tubular form.
8. A filter as claimed in claim 7, wherein the tubular support surfaces are of cylindrical, square or other polygonal cross section.
9. A filter as claimed in any one of claims 1 to 6, wherein the support surfaces are provided by an array of substantially parallel support surfaces arranged so that gas can flow across each surface.
10. A filter as claimed in claim 9, wherein the support surfaces are separated by separator walls.
11. A filter as claimed in claim 10, wherein the separator walls are of plastics material.
12. A filter as claimed in claim 10 or 11, wherein the separator walls are of small thickness.
13. A filter as claimed in claim 10, 11 or 12 comprising an array of extruded fluted plastics sheet material.
14. A filter as claimed in claim 13, wherein alternate flutes are omitted and stubs of flute material left at sides as spacers.
15. A filter as claimed in any one of claims 1 to 14, wherein the adsorber material particles are in a range of sizes from millimetres to 0.1 micron.
16. A filter as claimed in any one of claims 1 to 15, wherein the adsorber material is activated carbon particles of 0.1 to 0.2 mm size.
17. A filter as claimed in any one of claims 1 to 16, wherein the adsorber material particles are adhered to the support surfaces by partially melting the support surfaces.
18. A filter as claimed in claim 17, wherein the support surfaces are partially melted in a heated oven or a microwave oven.
19. A filter as claimed in any one of claims 1 to 16, wherein the adsorber material particles are adhered to the support surfaces by electrostatic attraction.
20. A filter as claimed in any one of claims 1 to 16, wherein the adsorber material particles are adhered to the support surfaces by adhesive.
21. A filter as claimed in claim 20, wherein the adhesive is of low volatile substance emissions type.
22. A filter as claimed in claim 21, wherein the adhesive is selected from latex, acrylic or water based contact adhesives, silicone based adhesives and wax.
23. A filter as claimed in claim 19, wherein the adsorber material particles are charged electrically prior to adhesion.
24. A filter as claimed in claim 23, wherein the support surfaces are oppositely charged electrically to facilitate adhesion.
25. A filter as claimed in any one of claims 9 to 24, wherein the support surfaces are separated by a distance of from 0.1 mm to 20 mm.
26. A filter as claimed in claim 25, wherein the support surfaces are separated by a distance of from 2 to 4 mm.
27. A filter as claimed in claim 25, wherein the support surfaces are separated by a distance of about 2 mm.
28. A filter as claimed in any one of claims 10 to 27, wherein, when the support surfaces are separated by separator walls, the separator walls are spaced apart by a distance of from 0.5 mm to 20 mm.
29. A filter as claimed in claim 28, wherein the separator walls are spaced apart by a distance of from 2 to 6 mm.
30. A filter as claimed in claim 28, wherein the separator walls are spaced apart by a distance of about 2 mm.
31. A filter as claimed in any one of claims 1 to 30, wherein the volatile substance adsorber material is activated carbon particles or granules.
32. A filter as claimed in any one of claims 1 to 30, wherein the adsorber material is a hygroscopic or deliquescent material.
33. A filter as claimed in any one of claims 1 to 30, wherein the adsorber material is selected from zeolites, silica gel and calcium chloride.
34. A filter as claimed in any one of claims 1 to 33 including means for urging gas flow therethrough
35. A filter as claimed in claim 34, wherein the urging means is a fan.
36. A volatile substance filter substantially as hereinbefore described with reference to and as illustrated in any one of FIGS. 5 to 10 of the accompanying drawings.