Single-screw extruder with hollow rotor member

US11548198B2 · kind B2 · utility

Assignee

• Teknologian tutkimuskeskus VTT Oy · FI

Inventors

• Hannu Minkkinen · Espoo, FI
• Antti Ojala · Ludwigshafen, DE
• Kirsi Immonen · Espoo, FI

Key dates

• Filing date: Aug 25, 2017
• Grant date: Jan 10, 2023
• Expiry date: Sep 22, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/10
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A single-screw extruder (100), and a method. The extruder (100) comprises—a cylindrical rotor member (1) having diameter (D) and length (L) and comprising a feeding zone (14), —the rotor member (1) arranged in a barrel (2), —the cylindrical surface of the rotor member (1) carrying cavity/cavities and/or projection(s) (5) arranged in helically extending rows, —the helically extending row(s) of the rotor member (1) having a pitch (P) and depth (d) in the feeding zone (14) of the rotor member, and the extruder (100) further compris-ing—a drive system (4) for the rotation of the rotor member (1) in the barrel (2). The relation of the depth (d) to the diame-ter (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 di-ameter (D) of the rotor member, i.e. P:D, is not more than 1:4.