SCREW EXTRUSION PRESS Russian patent published in 2003 - IPC

FIELD: machine building, applicable in constructions of extrusion presses designed for production of moulded fuel by the method of extrusion from composite materials, mainly from a mix of peat with woodworking waste (sawdust, chips, fractured particles, splinters). SUBSTANCE: the screw extrusion press has a frame that mounts a receiving bin and a body with a matrix channel, nozzle and screw installed for rotation. The screw is made tapered with guide and working zones, the latter of which consists of a packing and moulding parts. The packing part is made with turns of a variable profile and a decreasing depth of the grooves in the direction of motion of the moulded mass. It is expedient that the screw taper angle would make up 3 to 5 deg, and the taper angle of the moulding part of the screw working zone - 4 to 6 deg. The grooves of the screw packing part may be made with a decrease of the depth from 20 to 15 mm. The nozzle may be provided with a heater, and all the working planes of the screw are polished. EFFECT: simplified design of the extrusion press, enhanced reliability and reduced power consumption. 6 cl,1 dwg