Abstract: Apparatus for the continuous forming of material by extrusion and having a rotatable wheel member with an endless groove therein, a stationary shoe member overlying part of the length of the groove and having a portion which projects into said part of the length of the groove and is of a width substantially equal to that of the groove so as to form a passageway therewith, a stationary abutment member associated with the shoe member and projecting into the groove so as to block the downstream end of the passageway, is characterized by the improvement that the wheel member has one or more endless grooves in its periphery, arranged in parallel planes where more than one groove is provided, the shoe member has as many projecting portions as grooves, the or each projecting portion engages the or the respective groove, a duct leads from the passageway formed by the shoe member with the or each groove, through the or the respective projecting portion into a single chamber formed in the shoe member, and one or more d