METHOD AND INSTALLATION FOR PRODUCING FOIL FROM EXPANDED GRAPHITE Russian patent published in 1998 - IPC

FIELD: carbon materials production. SUBSTANCE: invention aims at producing graphite foil with controlled density distribution and consists in feeding expanded graphite particles in gas carrier flow with expanded graphite uptake 0.1-0.5 kg per 1 cu.m of gas, affecting expanded graphite by 5-10-Hz frequency vibrations, and twice rolling vibrationally packed expanded graphite layer using intermediate annealing. Installation has graphite expansion chamber with gas- discharge and atmosphere pressure-maintenance means. The bottom of chamber is made for vertical displacement and has parallel cuts. It is connected to the low-frequency vibrator and placed over horizontally disposed conveyor belt. The second conveyor belt is installed at angle 5 to 15 deg. to the first one. Chamber bottom is made flat with edges bent upward with bending radius 1.0 to 50 mm or it has another, more complicated shape. Installation also comprises annealing furnace and rollers. EFFECT: increased uniformity and strength of foil; simplified process and installation; enabled production of foil with density distribution. 4 cl, 4 dwg, 1 tbl