METHOD AND DEVICE FOR PRODUCTION OF POWDER FROM POLYMERIC MATERIAL (MODIFICATIONS) Russian patent published in 2001 - IPC

FIELD: working of polymeric materials, applicable for milling of natural and synthetic polymeric materials in the form of friable crumb, shred and fibres, natural silk and superhigh-modulus fibre inclusive. SUBSTANCE: method consists in packing of the material by action of shearing strains on it at a pressure rise from 0.1-0.5 MPa to 3-100 MPa and subsequent milling by action of shearing strains at a pressure drop and at cooling. Material packing is accomplished at shearing strains within 0.5 to 1000 and throttling at a rate of 3•10^-3-1•10^-1 m/s to a medium at a pressure of 0.01 to 0.16 MPa. The device for production of powder from polymeric material has a cylindrical body with charging and discharge openings, with the packing chamber and the milling chamber arranged in succession coaxially in it. A means for compression of polymeric material is positioned in the packing chamber, and a milling member is installed for rotation coaxially in the milling chamber with formation of an annular gap relative to the inner surface of the milling chamber body. The milling member is made as a throttle in the form of a disk or truncated cone, or in the form of coaxially and rigidly connected disk and truncated cone, whose smaller base faces the charging opening or the discharge opening, the relation between the diameters of the disk and the larger base of the truncated cone makes up 1:(0.8-1), and the milling member is installed with an annular gap, whose width in the narrow section makes up 0.2 to 10 mm, the device is additionally provided with means for cooling the packing chamber body and/or means for cooling the compression unit. Another modification of the device is claimed. EFFECT: expanded sphere of milled polymers and enhanced capacity. 18 cl, 4 dwg, 1 tbl