Teknologian Tutkimuskeskus Vtt Oy

Juha Mannila

Hannu Minkkinen

Jani Lehto

Christian Lindfors

Anja Oasmaa

A single-screw extruder and method are disclosed wherein the extruder includes a cylindrical rotor member arranged in a barre, and a drive system for rotation of the rotor member in the barrel. The extruder includes an outlet-provided with a die, having an outer ring arranged to the barrel, and an inner die part, the die establishing a flow channel that is continuously circular in all its cross-sections.

Single-screw extruder and a method for extrusion

A method and apparatus for thermolysing organic material. The method comprises steps of: A) feeding the material in a single-screw extruder (), the extruder comprising —a cylindrical rotor member () having diameter (D) and length (L) and comprising a feeding zone (), —the rotor member () arranged in a barrel (), —the cylindrical surface of the rotor member () carrying cavity/cavities and/or projection(s) () arranged in helically extending rows, —the helically extending row(s) of the rotor member () having a pitch (P) and depth (d) in the feeding zone () of the rotor member, wherein —the relation of the depth (d) to the diameter (D) of the rotor member, i.e. d:D, is not more than 1:20, and —the relation of the pitch (P) of the rotor member to the diameter (D) of the rotor member, i.e. P:D, is not more than 1:4, B) heating the material in the single-screw extruder () to a flowable state, and C) thermolysing the material.

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Tampere, Finland

Juha Mannila