IMPROVEMENTS IN OR RELATING TO METHODS OF PRODUCING WIRES

1,269,937. Extruding; making wires and wire ropes. DUNLOP HOLDINGS Ltd. 13 May, 1969 [29 May, 1968], No. 25601/68. Headings B3A and B3P. [Also in Division D1] A multi-strand wire is produced either by hydrostatically extruding a wire billet 4 through a multi-orifice die 2 or by simultaneously hydrostatically extruding wires 12 through a multiorifice die 9 and feeding the extruded wires in a bundle from the die. The extrusion die 2 is attached to the extrusion chamber 1 by an annular cap 2a. The hydrostatic fluid is a mixture of glycerine and glycol in the ratio 3 : 1 by volume. The wire billet 4 or the wires 12 are fed from a spool in the extrusion chamber and are of carbon steel. The extruded wires may be pulled to assist passage through the die. The wires may be twisted to form yarns and at least two yarns may be twisted together to form a cord.