Extrusion Screw Speed Regulation via Roller Synchronization
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Solution Overview
Problem
Extrusion devices face challenges in maintaining constant throughput and product profile quality due to variations in downstream device consumption rates, leading to inefficiencies and potential degradation of elastomeric compounds, especially during transient stoppages or changes in elastomer supply.
Innovation Solution
A method that synchronizes the rotational speed of the screw with the roller speed using a proportionality coefficient, with real-time adjustments based on measured thickness and slip limit speed to prevent screw slippage, ensuring consistent product quality and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the screw is increased to maintain constant throughput during downstream device stoppages, then productivity is maintained, but the elastomeric compound temperature increases causing degradation and bubbles
Solution Approach 1:
The control system predicts downstream device stoppages before they occur and preemptively reduces screw rotational speed to prevent temperature increase and compound degradation, rather than waiting for the problem to manifest
Solution Approach 2:
The system uses measurement means to detect changes in downstream device consumption rate in advance, allowing the screw speed to be adjusted before the actual stoppage occurs, maintaining optimal processing conditions
2Object-affected harmful factors
If the rotational speed of the screw is reduced to prevent compound degradation, then temperature control is improved, but productivity decreases due to insufficient throughput
Solution Approach 1:
The screw rotational speed is made dynamically adjustable based on real-time detection of downstream device consumption rate, allowing optimization between temperature control and throughput depending on actual operating conditions
Solution Approach 2:
Measurement means continuously monitor the consumption rate of the downstream device and provide feedback to the control system, which automatically adjusts screw speed to maintain optimal processing conditions while maximizing throughput
3Productivity
If the proportionality coefficient between screw speed and roller speed is increased to synchronize throughput, then productivity is improved, but screw slippage occurs reducing manufacturing precision
Solution Approach 1:
The system determines an optimal proportionality coefficient in advance based on device characteristics, and uses measurement means to detect when actual conditions deviate from optimal conditions, allowing pre-correction before significant profile deviations occur
Solution Approach 2:
The control system continuously monitors the relationship between screw and roller speeds using measurement means, and automatically adjusts the proportionality coefficient to maintain both synchronized throughput and consistent product profile
Data Source
AI summary
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.