A screw extruder and a method of controlling extrusion pressure in a screw extruder
AssigneeCircmet AS
InventorsØyvind NIELSEN, Idar Kjetil STEEN, Jens Christofer WERENSKIOLD
Life of this patent
Estimating the term…
Abstract
A screw extruder for extrusion of materials with high viscosity, including a screw rotationally arranged in a bore within a housing. The housing includes a base section having a material feed inlet, an extrusion section having a compacting chamber and an extrusion die opening, and one or more transport and compaction sections arranged between the base section and the extrusion section. At least one of the housing sections includes one or more fluid conduits and one or more fluid connectors for connection to a fluid supply and circulation system, whereby the temperature in the at least one housing section may be controlled individually.
Claims17
A screw extruder for extrusion of materials with high viscosity, comprising a screw rotationally arranged in a bore within a housing,
- wherein the housing comprises:
- a base section having an inlet configured for feeding a material to be compacted and extruded into the screw extruder;
- and
- an extrusion section having a compacting chamber and an extrusion die opening,
- wherein the screw extruder further comprises a plurality of transport and compaction sections arranged between the base section and the extrusion section, and
- wherein housing sections, comprising the base section, the plurality of transport and compaction sections, and the extrusion section, are releasably interconnected in an end-to-end relationship.
A method for controlling extrusion pressure in a screw extruder for extrusion of a material or materials with high viscosity,
- wherein the screw extruder comprises a screw rotationally arranged in a bore within a housing, and
- wherein the method comprises:
- controlling a temperature in the screw (tR) and a temperature in a wall of the bore (tB) while the screw is rotating and the material or materials are within a mixing-and-compaction zone in the screw extruder, such that the temperature in the screw is higher than the temperature of the wall of the bore (tR>tB).
Dependencies are inferred from the claim text.