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AssigneeSaint-Gobain Isover
InventorsAlice Morcrette, Jean-Pierre Maricourt, Laurent Piercucci, Eerik Nousiainen, Jean-Dominique Depuille, Eric Vandenhecke
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A process for manufacturing a filter medium including a felt of mineral fibers bonded to a veil. The process forms fibers by a device employing internal centrifuging, that includes a fiberizing spinner dish. Then, a precursor of a binder is sprayed onto the fibers. Then, the fibers are collected on a veil. And then, a heat treatment of the assembly including the fibers and the veil is performed with a controlled thickness to convert the binder precursor into a binder. The filter medium thus obtained allows the production of particularly effective pocket filters.
1-24. (canceled)
A process for manufacturing a filter medium including a felt of mineral fibers bonded to a veil, the process comprising:
A pocket filter having a mean spectral efficiency ranging from 80 to 90% and having a retention capacity, as measured according to the EN 779 standard, of at least 45 g/m2, a filter medium of which has a weight per unit area ranging from 60 to 70 g/m2.
A pocket filter having a mean spectral efficiency ranging from 60 to 80% and having a retention capacity, as measured according to the EN 779 standard, of at least 50 g/m2, a filter medium of which has a weight per unit area ranging from 70 to 90 g/m2.
A pocket filter having a mean spectral efficiency ranging from 40 to 60% and having a retention capacity, as measured according to the EN 779 standard, of at least 60 g/m2, the filter medium of which has a weight per unit area ranging from 80 to 100 g/m2.
Dependencies are inferred from the claim text.