Extruder and method for performing a diagnostic investigation in an extruder
AssigneeSacmi Cooperativa Meccanici Imola Societa' Cooperativa
InventorsFillippo VENTURI, Davide BALDISSERRI, Stefano BERGAMI
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Abstract
An extruder for polymeric materials, includes: a hollow extrusion cylinder, having an inlet for receiving pellets of polymeric material, and an outlet for expelling molten polymeric material; an extruder screw connected to a motor to rotate inside the extrusion cylinder and to move the polymeric material from the inlet to the outlet; heaters coupled to the extrusion cylinder; a sensor system configured to measure values of a recipe parameter and of a monitoring parameter; a processing unit, programmed to store a target value for the recipe parameter and to perform a feedback control to bring the recipe parameter to the target value and to keep it at the target value.
Claims21
An extruder for polymeric materials, comprising:
- a hollow extrusion cylinder, extending along a longitudinal direction and having an inlet for receiving pellets of polymeric material, and an outlet for expelling molten polymeric material;
- an extruder screw connected to a motor to rotate inside the extrusion cylinder and to move the polymeric material from the inlet to the outlet;
- heaters coupled to the extrusion cylinder;
- a sensor system configured to measure values of a recipe parameter and of a monitoring parameter;
- a processing unit, programmed to store a target value for the recipe parameter and to perform a feedback control on the heaters to bring the recipe parameter to the target value and to keep it there,
- wherein the processing unit is programmed to process a first value of the monitoring parameter, measured at a first time instant, and a second value of the monitoring parameter, measured at a second time instant, after the first time instant, and is programmed to generate alert data in response to a comparison between the first and the second value of the monitoring parameter.
A method for performing a diagnostic investigation in an extruder for polymeric materials, wherein the extruder comprises:
- an extruder screw connected to a motor to rotate inside an extrusion cylinder provided with heaters and to move the polymeric material from an inlet to the outlet, causing the polymeric material to melt;
- a sensor system for measuring a recipe parameter;
- a processing unit, programmed to store a target value for the recipe parameter and to perform a feedback control on the heaters to bring the recipe parameter to the target value and to keep it there,
- the method comprising the following steps:
- measuring a monitoring parameter;
- processing a first value of the monitoring parameter, measured at a first time instant, and a second value of the monitoring parameter, measured at a second time instant, after the first time instant;
- generating alert data in response to a comparison between the first and the second value of the monitoring parameter.
(canceled)
An extruder for polymeric materials, comprising:
- a hollow extrusion cylinder, extending along a longitudinal direction and having an inlet for receiving pellets of polymeric material, and an outlet for expelling molten polymeric material;
- an extruder screw connected to a motor to rotate inside the extrusion cylinder and to move the polymeric material from the inlet to the outlet;
- heaters coupled to the extrusion cylinder;
- a sensor system configured to measure values of a recipe parameter and of a monitoring parameter;
- a processing unit, programmed to store a target value for the recipe parameter and to perform a feedback control based on the recipe parameter,
- wherein the processing unit is programmed to process a first value of the monitoring parameter, measured at a first time instant, and a second value of the monitoring parameter, measured at a second time instant, after the first time instant, and is programmed to generate alert data in response to a comparison between the first and the second value of the monitoring parameter, and wherein the processing unit is programmed to store a first succession of values for the monitoring parameter captured one after the other and spaced by a first predetermined time interval, wherein the first value of the monitoring parameter and the second value of the monitoring parameter are selected from the values of the first succession.
Dependencies are inferred from the claim text.