Bicc Plc

Peter Gregory

Peter Michael Raw

Alan John Bangay

Stanley W Pigott

Rees Jenkin Llewellyn

An extrusion machine is disclosed wherein wax or other suitable lubricant is applied to the side of the feedstock contacting the shoe of the extruder. A stick of wax may be supported in a cylinder having an open end facing the feedstock; the stick is a loose sliding fit in the cylinder and compressed gas introduced into the cylinder applies a substantially constant biassing force urging the stick into engagement with the feedstock and at the same time, by leaking between the stick of lubricant and the cylinder, cools the stick of lubricant to inhibit melting.

Continuous extrusion of metals

Elongate copper bodies, such as rods and wires, of electric conductor grade are made by electrodepositing copper as brittle cathodes which are then broken into fragments and fed as such to a continuously-acting friction-effected extrusion machine (such as Conform or Linex) which consolidates, bonds and extrudes them. The fragments have a specific surface area of about 25 - 1000 mm.sup.2 /g, and they are not subjected to any high-temperature purification or grain growth step prior to extrusion, though moderate pre-heating is allowed. Avoidance of high-temperature processing, such as conventional casting and hot-rolling, saves much energy and in addition copper of higher quality is produced.

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Great Missenden, United Kingdom

Peter Gregory