Method for monitoring and controlling a twin-screw extruder, and twin-screw extruder
AssigneeClextral
InventorsDaniel DURAND, Thierry JAROUSSE
Life of this patent
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Abstract
In the disclosed method, in order to control an extruder including two intermeshing screws for driving a material to be extruded, the following steps are performed while a material to be extruded is being processed by the extruder: constantly measuring the viscosity of the material in the flow of the material in the extruder, and adjusting the extruder in accordance with the viscosity measurement. In order to adjust the extruder in an effective and efficient manner, the rate at which the extruder is filled with material along the intermeshing screws is modified by adjusting, downstream from the screws, a flow cross-section for the material in accordance with the viscosity measurement.
Claims16
1-15. (canceled)
A method for monitoring and controlling an extruder, the extruder comprising two intermeshing screws for driving a material to be extruded, the method comprising, while a material to be extruded is processed by the extruder:
- continuously measuring the viscosity of the material in a flow of said material in the extruder, and
- adjusting the extruder from corresponding material viscosity measurement results, so that a material filling level of the extruder, at which the extruder is filled by the material along the intermeshing screws, is modified by adjusting, downstream from these screws, a passage section for the material based on the material viscosity measurement results.
An extruder, comprising:
- a sheath inside which two intermeshing screws are rotated to cause a material to be extruded to advance in the sheath,
- measuring means for measuring the viscosity of the material in a flow of the material in the extruder,
- an output device, which is arranged at the downstream end of the sheath and in a flow channel of which the material leaving the sheath is forced to flow under the action of the intermeshing screws, and
- a varying device for varying a passage section of the flow channel so as to modify a material filling level at which the sheath is filled by the material.
Dependencies are inferred from the claim text.