METHOD FOR REGULATING AN EXTRUSION DEVICE AND EXTRUSION DEVICE USING SAID METHOD

摘要

Method for regulating an extrusion device for the manufacture of a continuous strip of profiled product (P) made of an elastomeric compound, comprising a screw rotationally driven in a fixed barrel the outlet of which comprises an extrusion die and at least one rotationally driven cylindrical roller, the rotational speed of the screw (Ωscrew) being directly connected to the rotational speed of the roller (Ωroller) by a proportionality coefficient, including:
for a given elastomeric compound and a given profiled product (P), determining a setpoint value Ks of the proportionality coefficient,measuring the thickness (e) of the profiled product (P) leaving the extrusion die at each instant and correcting the value of the proportionality coefficient to Ks′,correcting the rotational speed of the screw taking account of the corrected value Ks′ of the proportionality coefficient, such that Ω′screw=Ks′*Ωroller ;The roller speed is adjusted as a function of the corrected value Ks′ of the proportionality coefficient.

主权项

1. A method for regulating an extrusion device adapted for the manufacture of a continuous strip of profiled product (P) made of an elastomeric compound, comprising a screw rotationally driven in a fixed barrel the outlet of which comprises an extrusion die and at least one rotationally driven cylindrical roller, the rotational speed of the screw (Ωscrew) being directly connected to the rotational speed of the roller (Ωscrew) by a proportionality coefficient, the regulating method comprising:
for a given elastomeric compound and a given profiled product (P), determining a setpoint value Ks of the proportionality coefficient, and the setpoint values for the roller speed Ωroller up to a maximum setpoint roller speed Ωroller max for which the maximum rotational speed of the screw is Ωscrew max=Ks*Ωroller max, measuring the thickness (e) of the profiled product (P) leaving the extrusion die is measured at each instant, correcting the setpoint value of the coefficient Ks as a function of the measured value of the thickness (e) to a corrected value Ks′ so as to bring the measured value back to a setpoint value (esetpoint) of the thickness of the profiled element (P), correcting the rotational speed of the screw taking account of the new corrected value Ks′ of the proportionality coefficient, such that Ω′screw=Ks′*Ωroller wherein the roller speed is adjusted as a function of the corrected value Ks′ of the proportionality coefficient when the rotational speed of the screw Ω′screw exceeds a slip limit speed.