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US 12,115,508 B2Granted
Single-screw extruder and a method for extrusion
AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsHannu Minkkinen, Juha Mannila
Life of this patent
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Abstract
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.
Claims19
A single-screw extruder, comprising:
- a cylindrical rotor member having a diameter (D) and a length (L) and including a feeding zone;
- the rotor member being arranged in a barrel;
- a 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;
- a drive system for rotation of the rotor member in the barrel, wherein:
- a relation of a depth (d) to diameter (D) of the rotor member d:D is not more than 1:20;
- and
- a relation of the pitch (P) of the helically extending rows of the rotor member to the diameter (D) of the rotor member P:D is not more than 1:4;
- and
- an outlet of the extruder, is provided with a die including:
- an outer ring arranged relative to the barrel;
- and
- an inner die part arranged relative to the cylindrical rotor member to rotate therewith;
- and
- the die being configured for establishing a flow channel that is continuously circular in all its cross-sections.
12 more elements
A single-screw extruder, comprising:
- a cylindrical rotor member having a diameter (D) and a length (L) and including a feeding zone;
- the rotor member being arranged in a barrel;
- a 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;
- a drive system for rotation of the rotor member in the barrel, wherein:
- a relation of a depth (d) to a diameter (D) of the rotor member d:D is not more than 1:20;
- and
- a relation of the pitch (P) of the helically extending rows of the rotor member to the diameter (D) of the rotor member P:D is not more than 1:4;
- the rotor member includes a cylindrical channel, a diameter of which is at least 75% of the diameter (D) of the rotor member;
- and
- an outlet of the extruder, provided with a die, the die including:
- an outer ring and an inner die part creating a flow channel that is continuously circular in all its cross-sections;
- the outer ring being attached to the barrel;
- and
- the inner die part being supported to a support structure that is arranged inside said cylindrical channel;
- the rotor member being arranged rotable with respect to the inner die part.
13 more elements
A method for extrusion, the method comprising:
- A) feeding material in a single-screw extruder, the extruder including:
- a cylindrical rotor member having a diameter (D) and a length (L) and including a feeding zone;
- the rotor member being 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;
- a drive system for the rotation of the rotor member in the barrel, wherein:
- a relation of the depth (d) to the diameter (D) of the rotor member d:D is not more than 1:20;
- and
- a relation of the pitch (P) of the helically extending rows of the rotor member to the diameter (D) of the rotor member P:D is not more than 1:4;
- B) heating the material in said single-screw extruder to a flowable state;
- C) feeding the material into an outlet of the extruder, the outlet being provided with a die including:
- an outer ring arranged relative to the barrel;
- and
- an inner die part arranged relative to the cylindrical rotor member to rotate therewith;
- the die establishing a flow channel that is continuously circular in all its cross-sections;
- and
- D) allowing the material to exit between the outer ring and the rotating inner die part.
14 more elements
A method for extrusion, the method comprising:
- A) feeding material in a single-screw extruder, the extruder including:
- a cylindrical rotor member having a diameter (D) and a length (L) and including a feeding zone;
- the rotor member being 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;
- a drive system for rotation of the rotor member in the barrel, wherein;
- a relation of the depth (d) to the diameter (D) of the rotor member d:D is not more than 1:20;
- and
- a relation of the pitch (P) of the helically extending rows of the rotor member to the diameter (D) of the rotor member P:D is not more than 1:4;
- B) heating the material in said single-screw extruder to a flowable state;
- C) feeding the material into an outlet of the extruder, the outlet being provided with a die comprising including an outer ring and an inner die part creating a flow channel that is continuously circular in all its cross-sections, wherein:
- the outer ring is arranged relative to the barrel and
- the inner die part is supported to a support structure that is arranged inside said a cylindrical channel of the rotor member;
- the rotor member being arranged rotable in with respect to the inner die part;
- and
- D) allowing the material to exit between the outer ring and an unrotating surface of the inner die part.
13 more elements
Dependencies are inferred from the claim text.