Corrugated Cardboard Warp Control via Feedforward Correction
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Solution Overview
Problem
The existing corrugated fiberboard warping rectification systems require time to adjust control values after a production state change, leading to potential damage due to insufficient warping suppression.
Innovation Solution
A system that includes production state information acquisition, control value information acquisition, warping information acquisition, storage, and updating mechanisms to create and update correction tables for feedforward control of control elements, allowing for quick optimization of control values based on actual data sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If feedback control is used to correct control values after production state changes, then warping suppression accuracy is improved, but response time increases and productivity decreases
Solution Approach 1:
The system performs preliminary action by pre-calculating and storing optimal control values in a pre-control table for various production states before actual production changes occur. When a production state change is detected, the system can immediately retrieve and apply the pre-computed control values, eliminating the need for time-consuming feedback adjustment cycles. This resolves the contradiction by providing both high precision (through pre-optimized values) and fast response (through immediate retrieval).
Solution Approach 2:
The system dynamically switches between different control strategies: using pre-stored optimal values from the pre-control table for rapid response, and optionally refining with feedback control if needed. This dynamic approach allows the system to adapt its control method based on the situation, achieving both speed and accuracy without being constrained by a single static control mechanism.
2Adaptability or versatility
If matrix-control with pre-control table is used to set initial control values, then adaptability to production state changes is improved, but manufacturing precision decreases due to insufficient initial values
Solution Approach 1:
The system incorporates feedback mechanisms where actual warping measurements are continuously monitored and used to refine and update the pre-control table. The feedback loop compares predicted warping (from matrix-control) with actual warping, and adjusts the stored control values to minimize the difference. This resolves the contradiction by maintaining adaptability through the pre-control table structure while improving precision through continuous feedback-based optimization.
Solution Approach 2:
The system performs preliminary optimization by pre-calculating control values based on historical data and production patterns, storing these optimized values in the pre-control table. This preliminary action ensures that when production state changes occur, the system starts with already-optimized values rather than generic matrix-control values, thereby improving initial precision while maintaining adaptability.
3Manufacturing precision
If feedback control is restarted after each production state change, then control accuracy is improved, but time loss increases and damaged paper occurs
Solution Approach 1:
The system performs preliminary action by pre-calculating and storing optimal control values for various production states in advance. When a production state change occurs, the system immediately retrieves the pre-computed values instead of restarting feedback control, thereby eliminating adjustment time loss and preventing damaged paper while maintaining control accuracy through pre-optimized values.
Solution Approach 2:
The system enables self-service by automatically selecting and applying appropriate control values from the pre-control table based on detected production states, without requiring time-consuming feedback control cycles. This self-service mechanism resolves the contradiction by providing both accurate control (through pre-optimized values) and immediate response (through automatic selection), eliminating time loss and damaged paper.
Data Source
AI summary
The corrugated cardboard sheet manufacturing system including a production state information acquisition device; a control value information acquisition device for acquiring control value information of a control element of a corrugated cardboard sheet manufacturing apparatus exerting an influence on the warp of a corrugated cardboard sheet; a warp information acquisition device for acquiring information of a warp amount of the corrugated cardboard sheet; a storage device for storing a performance data set including at least production state information, the control value information, and the warp information; a pre-control table storing a standard control value of the control element set in accordance with a production state; a correction table for correcting the standard control value to set an initial control value; an update device for updating the correction table by reflecting the performance data set; and control device for performing feedforward control of the control element using the initial control value.