Planetary roller extruder for processing biodegradable materials and method for cleaning the planetary roller extruder

A planetary roller extruder for homogenizing, dispersing, pasteurizing, and purposefully controlling the temperature of biodegradable materials that are prone to altering their properties during processing, including the properties that rule out further use after the materials have been processed, including foodstuffs, or medicinal products or pharmaceutical products, different regions being present in the planetary roller extruder, the planetary roller extruder comprising:

• a flow conduit having various transitions from one region to a next region in an interior of the planetary roller extruder;
• components being statically and movably installed;
• a seal installed between statically installed components, by which seal gaps or cavities present are configured to be closed;
• and
• a slide ring seal that provides sealing between moving components, which are led from the flow conduit in the interior of the planetary roller extruder outward to a surrounding area, so as to avoid steps and/or notches along flow surfaces in a transition region of the moving components.