METHOD OF MANUFACTURE OF VOLUMETRICAL MULTI-LAYER FILTERING MATERIAL AND FILTERING ELEMENT Russian patent published in 2008 - IPC B01D39/16 B01D29/00 

FIELD: technological processes.

SUBSTANCE: invention is related to production of highly porous multi-layer polymer materials for manufacture of filtering elements, which are used for filtration of oil products, technological fluids, gases and water. Method includes fractional filling of form sections with powdery polyethylene, which are separated by at least two partitions, mechanical sealing, simultaneous sintering of form sections content into layers of porous one-piece filtering element, forced cooling, pressing-out of filtering element from form and mechanical processing. Filtering element contains at least three one-piece sintered open-porous layers made of different fractions of powdery polyethylene from the following group: ultrahigh molecular polyethylene and polyethylene that is radiation-modified by gamma radiation, with dimensions of pores from 1 to 200 micrometer. Neighbouring layers may be divided by partitions made of filtering paper.

EFFECT: increase of manufacturing process efficiency, increase of sorption capacity and durability of filtering element, possibility to produce thick-wall filtering elements of complex shape.

17 cl, 2 dwg