Coater and Embosser-Laminator Process Roll Calibration by Torque Feedback
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Solution Overview
Problem
Current methods for calibrating process rolls in coating and embossing-laminating machines lack precision, repeatability, and safety, often relying on subjective human judgment and complex mechanical adjustments.
Innovation Solution
An iterative process using actuators and feedback from motor torque changes to determine precise alignment and distance between rolls, ensuring consistent nip engagement across the width of the rolls, utilizing incremental adjustments and electronic feedback for accurate calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a person inserts a feeler gauge into the nip and makes adjustments until subjective judgment indicates consistent fit, then the gap measurement can be performed, but the measurement precision and repeatability are insufficient
Solution Approach 1:
The patent replaces the mechanical feeler gauge insertion method with an optical measurement system. A light source and detector are positioned to measure the gap between rolls optically, eliminating the need for manual mechanical insertion. This substitution provides objective, repeatable measurements that are not dependent on human subjective judgment, thereby improving both measurement precision and repeatability.
Solution Approach 2:
The patent implements a feedback mechanism where the optical measurement system continuously monitors the gap between rolls and provides real-time data to the control system. This feedback enables automatic adjustment and verification of the gap setting, ensuring consistent and repeatable measurements without requiring manual intervention, thus resolving the reliability issue.
2Manufacturing precision
If nip impression paper is attached and rolls are loaded, then the nip flat width can be measured, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent replaces the mechanical process of attaching nip impression paper and manually measuring the flat width with an optical measurement system. The system uses light to measure the nip flat width directly as the rolls are in operation, eliminating the need for paper attachment and manual measurement. This substitution dramatically reduces calibration time while maintaining or improving measurement accuracy.
Solution Approach 2:
The patent performs the nip flat width measurement during the normal operation of the rolls rather than requiring separate calibration steps. The optical system is positioned to measure the nip flat width continuously, so no preliminary preparation like attaching impression paper is needed. This preliminary action approach eliminates time-consuming steps while maintaining measurement accuracy.
3Adaptability or versatility
If the steel roll is engraved with discontinuous embossing protuberances and the pressure roll has a crowned profile, then the embossing function is achieved, but the nip calibration becomes complicated
Solution Approach 1:
The patent replaces complex mechanical measurement methods with an optical measurement system that can accurately measure the nip gap despite the discontinuous embossing pattern and crowned profile. The optical system measures the gap at multiple points across the width of the rolls, providing comprehensive data that simplifies the calibration process while maintaining the complex embossing geometry needed for versatile embossing patterns.
4Manufacturing precision
If incremental adjustments are made based on motor torque feedback, then precise alignment is achieved, but the calibration process becomes more complex
Solution Approach 1:
The patent uses feedback from motor torque changes to guide incremental adjustments during calibration. The control system monitors torque variations, which indicate when the rolls are approaching contact, and automatically adjusts the roll positions accordingly. This feedback mechanism achieves precise alignment while the automation reduces the operational complexity, as the system performs the complex adjustments without manual intervention.
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
Enhances safety, precision, and repeatability in roll calibration without additional complexity or cost, improving the consistency and quality of coating and laminating processes.
Implementation Method 1
rotating at least one of the rolls and detecting, with a motor, changes in torque that indicate contact between the rolls
Data Source
AI summary
Rolls of an embosser laminator unit may be calibrated with an iterative process of moving axial ends of the roll a set incremental distance until contact between the rolls is made and then making a correction to the distance based upon the end of the roll making contact. The rolls may be move an initial position where the faces of the rolls are devoid of contact with each other. One or both of the rolls may be rotated. The distance between the ends of the rolls may be decreased until the faces of the rolls make contact with each other. The distance between the first ends of the rolls may be increased by an incremental amount, and a determination of contact between the faces of the rolls may be made by alternate movement of the rolls by the incremental amount and position prior to contact.