Process for the extrusion of plastics tending to adherence

A material extruder, comprising:

• a housing comprising an internal toothing formed by a plurality of housing teeth which extend along an axial extension of the housing, each housing tooth of the internal toothing extending radially from a root at a root circle inwardly to a top;
• a central spindle disposed within said housing;
• planetary spindles configured and disposed to rotate about said central spindle between said central spindle and said housing;
• each of said planetary spindles comprising an external toothing configured to mesh with said internal toothing of said housing;
• said housing comprising an inlet opening configured to permit feeding of material to be extruded into an interior of said housing;
• and
• a feed guide being disposed at said inlet opening to guide material to be extruded into said inlet opening,
• wherein at least one housing tooth extends axially along a regular height portion and a shortened height portion, and
• wherein a regular height of the at least one housing tooth, defined by a radial distance from the root circle to the top of the at least one housing tooth at the regular height portion, is greater than a shortened height of the least one housing tooth, defined by a radial distance from the root circle to the top of the at least one housing tooth at the shortened height portion.