Device and method for the extrusion of thermo-mechanically deformable materials in bulk form, and compact screw extruder

An extrusion device configured to extrude thermo-mechanically deformable granular materials in an additive production process, the extrusion device comprising:

• a filling device defining an opening configured to receive a pre-processed material,
• a filling funnel extending from the filing device and provided with an intake region,
• an extruder screw includes a screw shaft extending in a first direction through the filling device and the filling funnel, the extruder screw further including a length and a diameter, wherein the length and diameter have a length-to-diameter ratio ranging between 1 and 10, and
• a comminution tool extending into the filling funnel and reducing a size of the intake region, wherein the extruder screw is configured to rotate relative to the comminution tool,
• wherein the comminution tool is circumferentially spaced apart from the opening and includes a truncated cone portion arranged radially opposite to the opening at an inner wall of the filling funnel, and
• wherein the comminution tool is configured to block a movement of a granular material in a circumferential direction within the intake region and crush granular material as the extruder screw rotates.

An extrusion device configured to extrude thermo-mechanically deformable granular materials in an additive production process, the extrusion device comprising:

• a filling device defining an opening configured to receive a pre-processed material,
• a filling funnel extending from the filing device and provided with an intake region,
• an extruder screw including a screw shaft extending in a first direction through the filling device and the filling funnel, the extruder screw further including a length and a diameter, wherein the length and diameter have a length-to-diameter ratio ranging between 1 and 10, and
• a comminution tool extending into the filling funnel and reducing a size of the intake region, wherein the extruder screw is configured to rotate relative to the comminution tool,
• wherein the comminution tool is circumferentially spaced apart from the opening and includes a plurality of vertically extending ribs or blades, and
• wherein the comminution tool is configured to block a movement of a granular material in a circumferential direction within the intake region and crush granular material as the extruder screw rotates.