| 摘要 |
<PICT:0814101/III/1> A substantially dustless, densified carbon black for use in lithographic and printing inks is prepared by tumbling carbon black, moistened with 2-12 per cent water, in a horizontally-mounted rotating drum containing a free roller equipped with at least two longitudinally spaced eccentric projections in the same radial plane, the black being charged to the drum to a depth not exceeding the diameter of the roller plus the height of the projections. The black, which may be wetted before, or after, charging, is fed through shoot 14 into pelleting drum 10 mounted on driven tyred wheels 12. As the drum rotates the roller 18, having projections 20, rotates in an eccentric path, rolling off legs 20, rolling across the bed of black, compacting the black without forming pellets, and rolling up on to legs, allowing black to slide beneath the roller. The product leaving by shoot 16 may be broken up in a high speed fan, or by brushing through a screen, and has a density of 16 lbs./cu. ft., or higher. The roller 18 may weigh 20-100 lbs./ft. Specification 475,847 is referred to. |
