WOVEN FILTERING MATERIAL Russian patent published in 1997 - IPC

FIELD: systems of sewage purification using their degradation by bacteria cultures made on proposed material. SUBSTANCE: aim is to increase effectiveness of sewage purification and to create small-scaled cost-saving highly effective sewage purification works. Woven filtering material has warp made of interlaced to each other warp and woof threads forming cells. Nap members one end is joined threads, that form cells. Inner contour of cells in longitudinal direction is limited by stripes of 3 - 10 cm width formed of interlaced between each other warp threads with density of 20-200 threads per decimeter and woof threads with density of 40-400 threads per decimeter. In transversal; direction contour of cells is limited by strips made of warp threads of 2-6 cm width. Nap members are formed of given length cut warp threads located inside cell contour. Ratio of width of stripes limiting cell contour to cell dimension in longitudinal direction is from 1 : 4 to 1 : 8 and in transversal direction - of no less than 1 : 10. Nap members, as a version, are formed of warp threads cut between stripes at given space continuously along the whole width of material. As warp threads volumetric textured thread of 100 - 500 tacks linear density is used and as woof threads chemical fibers twisted or single yarn of 25 - 250 tacks linear density is used. EFFECT: increased effectiveness of sewage purification. 2 cl, 3 dwg, 2 tbl