METHOD OF MANUFACTURE OF BELT-TYPE SEAL FROM EXPANDED GRAPHITE AND DEVICE FOR ITS EMBODIMENT Russian patent published in 2001 - IPC

FIELD: manufacture of seals. SUBSTANCE: method includes rolling of graphite foil, cutting this foil to form belts and initial forming of transversely directed grooves of constant depth along length of belt. Then, belt is subjected to reduction in thickness in way of its by rolling the belt between smooth cylindrical and taper bushes; prior to inserting the into crimping bushes, it is moved along these bushes in way of base of taper crimping bush. Device proposed for realization of this method includes base, body and two parallel kinematically linked shafts mounted in body; ends of these shafts projecting beyond body carry either pair of toothed bushes or air of smooth crimping bushes: one cylindrical bush and one taper bush. Mechanism for forming alternating radially directed grooves is additionally provided with unit for motion of belt along crimping bushes in way of base of taper crimping bush. EFFECT: smoothness of change of density of sealing belt lengthwise. 7 cl, 11 dwg