METHOD FOR MANUFACTURE OF DEPTH FILTER ELEMENTS Russian patent published in 1994 - IPC

FIELD: processing of plastic materials. SUBSTANCE: method involves cooling each jet of molten polymeric material and thinning out spun microfibers by tangentially-swirled stream of compressed air of conical shape. Said stream is swirled coaxially with each capillary while polymeric melt is being extruded. The streams of air discharged from adjacent orifices are swirled in opposite directions. Besides, while microfibers are being laid on removable mandrel the pressure of compressed air is changed concurrently with changes in its temperature, force of shaping roller and mandrel rotation speed in geometrical and arithmetical sequences or in progression of Fibonacci numerical series. As the number of layers of laid microfibers grows, the force of shaping roller and its rotation speed are decreased in the arithmetical or geometrical sequence or in progression of Fibonacci numerical series while the temperature of air is raised in the arithmetical succession. The polymeric material is polyolefins. EFFECT: higher efficiency. 4 cl, 2 dwg