Web Profiling Control Using Actuator Characteristic Curves
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Solution Overview
Problem
Existing quality control systems for paper, cardboard, or fiber webs face inefficiencies due to actuator wear and varying operating conditions, leading to suboptimal performance and potential disruptions in production.
Innovation Solution
A method involving regular calibration and characterization of actuator performance through quality measurement, using characteristic curves to ensure actuators operate within their optimal range, incorporating parameters like steam pressure, temperature, and web speed, and integrating these into a digital control system for precise actuator control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If actuators are operated continuously under varying conditions, then production productivity is improved, but actuator wear increases and control precision deteriorates
Solution Approach 1:
The system performs preliminary characterization of actuators to determine their individual characteristic curves before full production operation. This preliminary action establishes baseline performance data that enables the control system to compensate for wear and varying conditions during continuous operation, maintaining reliability while maximizing productivity.
Solution Approach 2:
The control system dynamically adjusts actuator control parameters based on measured quality profile deviations and characteristic curve data. By changing control parameters in response to actual performance, the system maintains optimal actuator effectiveness despite wear and varying operating conditions, resolving the contradiction between continuous operation and performance consistency.
2Manufacturing precision
If actuator control range is expanded to cover all web width positions, then quality profile control is improved, but actuator complexity and cost increase
Solution Approach 1:
The system uses dynamic characteristic curves that adapt to each actuator's actual performance rather than relying on static, idealized control ranges. This dynamic approach allows the existing actuator hardware to achieve optimal quality profile control without requiring expanded control ranges or additional actuators, avoiding increased system complexity.
Solution Approach 2:
The quality measurement system provides continuous feedback on actual web quality profile, which is used to update and refine actuator characteristic curves. This feedback loop enables precise quality control using the existing actuator configuration, eliminating the need for expanded control ranges or additional hardware complexity.
3Measurement precision
If characteristic curves are updated frequently to account for wear, then actuator control precision is improved, but system operation time is reduced due to calibration requirements
Solution Approach 1:
The quality measurement system serves dual functions: it monitors web quality profile for production control and simultaneously characterizes actuator performance for updating characteristic curves. This multi-functionality eliminates the need for separate calibration operations, allowing frequent updates of characteristic curves without sacrificing production time.
Solution Approach 2:
The system performs actuator characterization and quality measurement continuously during normal production operation rather than requiring separate calibration stops. The quality measurement carriage continuously scans the web width, collecting data that serves both quality control and actuator characterization purposes, maintaining continuous useful action without time loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures consistent optimal operation of actuators despite wear and changing conditions, improving production efficiency and reducing disruptions by maintaining precise control over moisture and basis weight profiles.
Implementation Method 1
an actuator system (5) designed to apply a different quantity of water or water vapor to the web (2) across the web width (CD) via a plurality of actuators (6)
Data Source
Figure 1
AI summary
A method for the automated optimization of a quality profile (1) of a paper, cardboard, or fiber web (web) (2), comprising a quality measurement system (3), an actuator system (5), and a control system (8), wherein the following steps are performed: • a maximum value is set for at least one actuator (6), the effectiveness of the action being determined at the maximum value using the quality measurement system (3), • the actuator (6) is controlled stepwise to the minimum value, the effectiveness of the action being determined for each step using the quality measurement system (3), • a characteristic curve (12) for the actuator (6) is calculated, which is used by the control system (8) to achieve the required quality profile (1) of the web (2). The invention further relates to a profiling system.