Extruder with a sheet extrusion head and an associated calender

An extruder with a wide extrusion head defining an elongated die for forming a sheet and an associated calender mounted in a frame, comprising an extruder housing movable into working position adjacent to said calender and into a position remote from said calender wherein the wide extrusion head, defining a sheet extrusion die, has an upper extrusion head part and a lower extrusion head part, means to separate the upper head part from the lower head part;

• clamping means to releasably press the upper extrusion head part and the lower extrusion head part together and which is mounted in an associated side wall of the calender and is provided with a hydraulically operable piston and cylinder drive unit, said clamping means comprising a tie rod, which releasably bears against the lower extrusion head part or against the upper extrusion head part by means of either a fixed abutment or by means of an axially variable abutment to vary the axial position of said axially variable abutment, and wherein said clamping means remains mounted on a side wall of said calender frame but is freely swingingly movable in the upward and horizontal directions.