Gas separation – With nonliquid cleaning means for separating media – Solid agent cleaning member movingly contacts apparatus
Patent
1981-03-03
1982-09-21
Prunner, Kathleen J.
Gas separation
With nonliquid cleaning means for separating media
Solid agent cleaning member movingly contacts apparatus
55372, 55472, 55473, 55482, 55487, 55524, 55528, 55DIG24, 55DIG35, 55DIG42, 73 28, 7386323, 12820125, B01D 5000
Patent
active
043505074
ABSTRACT:
A respirable particle sampling instrument passes air with a fan through a passage having first a pre-filter thereacross to collect non-respirable airborne particles and then a main filter to collect respirable particles, the pre-filter being formed by a random fibrous network having interstices of such size and distribution as to capture a major proportion of the non-respirable particles within a prescribed range of velocity for which particle capture is predominantly by inertial impaction. The pre-filter suitably comprises porous foamed plastics material, preferably in a structure of contiguous layers having successively changing pore sizes and distribution, preferably of a polyester, and preferably having an oil coating. The pre-filter will normally have a penetration function approximating the so-called Johannesburg curve.
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Brink, Jr., J. A. and Porthouse, J. D., "Efficient Dust Control Via New Sampling Technique", Chemical Engineering, (Mar. 10, 1969), pp. 106-110.
Brown Richard C.
Greenough George K.
National Research Development Corporation
Prunner Kathleen J.
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