Method and apparatus for extruding powdered material

An extrusion apparatus for extruding a powdered material, including a longitudinal die cavity into which the powdered material is charged, and a punch being adapted to be applied to an inlet of the die cavity for longitudinally pressing the powdered material charged in the die cavity to extrude the powdered material from an outlet of the die cavity, in which the die cavity comprises:

• a constriction passage with an inclined surface for narrowing the constriction passage, said constriction passage constricting the powdered material by means of pressure from the punch longitudinally applied to the charged powdered material so that the powdered material is laterally compressed through the constriction passage into a consolidated mass product of the powdered material;
• and
• a core piece arranged between the inlet and the constriction passage and Spaced from the constriction passage, for distorting the powdered material as the powdered material passes over the core piece so that border surfaces which are formed between two successively charged portions of the powdered material when the powdered material is repeatedly charged are broken, whereby said two successively charged portions of the powdered material are continuously connected to each other at the constriction passage while said two successively charged portions are compressed.