Corrugator Feedforward Control for Paper Roll Variability
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Solution Overview
Problem
Existing corrugated board production methods fail to account for the individual properties of paper rolls, leading to suboptimal production and increased rejects due to reliance on feedback control systems that adjust parameters based on uniform data assumptions.
Innovation Solution
A method that utilizes paper data, including individual paper parameters, to proactively adjust operating parameters of a corrugated board machine, using feedforward control to optimize production based on the unique characteristics of each paper roll, incorporating paper data from various sources and dynamically adjusting parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If feedback control systems are used to adjust operating parameters based on uniform data assumptions, then the control system is simpler to implement, but production quality deteriorates due to inability to account for individual paper roll variations
Solution Approach 1:
The system performs preliminary measurement of paper-specific parameters (moisture content, density, fiber composition) before processing, and pre-adjusts operating parameters based on these measurements. This feedforward approach allows the system to proactively compensate for individual paper roll variations rather than reacting to defects after they occur, thereby improving production quality without requiring complex real-time feedback mechanisms.
Solution Approach 2:
The system dynamically changes operating parameters (temperature, pressure, speed, coating thickness) based on measured paper-specific parameters. By adjusting these parameters according to the actual properties of each paper roll, the system achieves high manufacturing precision while maintaining relatively simple control logic that follows straightforward measurement-adjustment relationships.
2Manufacturing precision
If individual paper parameters are measured and used to adjust operating parameters, then production quality improves by compensating for paper variations, but measurement and data handling complexity increases
Solution Approach 1:
The system replaces complex manual measurement and adjustment procedures with automated optical and electronic measurement devices. Sensors and imaging systems automatically capture paper-specific parameters, and computer algorithms process this data to determine optimal operating parameters, eliminating the need for manual measurement and reducing measurement complexity while maintaining high production quality.
Solution Approach 2:
The system enables the paper roll itself to 'provide information' about its properties through automated measurement of intrinsic characteristics such as moisture content, density, and fiber composition. This self-characterization approach allows the paper to effectively communicate its requirements, simplifying the measurement process compared to traditional methods that require external assessment of each parameter.
3Productivity
If operating parameters are manually set or adjusted based on uniform assumptions, then the operation process is simpler, but productivity decreases due to increased rejects and rework
Solution Approach 1:
The system implements a feedback mechanism where measurement data from each paper roll is used to automatically adjust operating parameters for that specific roll. This closed-loop control ensures that each paper roll is processed with optimally adjusted parameters, minimizing defects and rework, thereby increasing productivity while maintaining operational simplicity through automated decision-making.
Solution Approach 2:
The system transitions from static, uniform operating parameters to dynamic, paper-specific parameters that automatically adapt to each roll's characteristics. This dynamic adjustment is achieved through automated measurement and control systems that modify parameters in real-time based on measured paper properties, increasing productivity without requiring manual intervention or complex operational procedures.
Data Source
Figure 1~2
AI summary
The invention relates to a method for operating a corrugator (2), the corrugator (2) being used to produce a corrugated cardboard web (4) and having a number of adjustable operating parameters (6) for this purpose, a number of paper rolls (12) being fed to the corrugator (2), each having a paper web made of a paper from which the corrugated cardboard web (4) is produced, the paper of each paper roll (12) being characterised by a number of paper parameters (14) which have individual values for each of the paper rolls (12) so that the paper of each paper roll (12) is individually characterised on the basis of its values for the paper parameters (14), and the operating parameters (6) being adjusted depending on the values of the paper parameters (14) so that the production of the corrugated cardboard web (4) is individually adapted to the paper of the fed paper roll (12). The invention also relates to a corrugator (2), a computer programme product, and a paper roll (12).