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B - Operations, Transporting

32

B

28/1

B32B 9/00 (2006.01) A61L 2/26 (2006.01) B01D 39/14 (2006.01) B01D 39/18 (2006.01) D21H 23/50 (2006.01) D21H 27/08 (2006.01)

Patent

CA 1309852

BARRIER PRODUCTS Abstract A porous material (e.g. a paper) has pores with a range of sizes. A pore modifying agent (comprising particles of a narrow size range) is selectively incorporated within the larger pores to provide zones of high surface area. These greatly reduce the penetrability of the material (e.g. by micro-organisms) while having relatively little effect on its air-permeability. The modifying agent may be incorporated by creating a pressure difference across the material, and treating it with a dispersion (e.g. an aerosol) of the modifying agent, under conditions of low inertia, and incorporating only a small amount of the agent (e.g. under 1% w/w).

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