METHOD AND DEVICE FOR CONTINUOUS MANUFACTURING HOLLOW BUILDING MATERIALS Russian patent published in 1994 - IPC

FIELD: manufacture of building materials. SUBSTANCE: device has case 1 with outlet hole 2 and charging hole 3, a compacting device in the form of piston 4, core 5 in the form of a mandrel rigidly connected to piston 4. Piston 4 has frame 6 on which variable radius rolls 7 embracing core 5 are mounted. Case 1 has nozzle 8 made in the form of a box with a unilaterally clamped flexible plates 9 rolled by rolls 7. A plastic mass, for example, asbestos cement mixture, is charged into case 1. Then the mass is pressed by piston 4 through hole 2 into nozzle 8, core 5 rigidly connected to piston 4 forms the inner space of the resulting article. The main forming effect on the plastic mass is produced by rolls 7 at the return stroke of piston 4 by pressing the mass through flexible plates 9 along a smooth forming curve to form the necessary article profile. EFFECT: improved quality. 4 cl, 4 dwg