Vacuum Plate Tensioner for Flexible Substrate Positioning
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Solution Overview
Problem
Varying friction between flexible substrates and processing system components in web applications makes it challenging to achieve high precision accuracy in web positioning, especially when the web is intermittently stopped.
Innovation Solution
A processing system with a tensioner and indexer that uses a vacuum plate to maintain a relative speed above a predefined threshold, even when the web is stopped, by moving the vacuum plate in the opposite direction of the transport direction, ensuring the relative speed remains in the linear region of the Stribeck curve, thereby compensating for frictional forces and improving positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the web is intermittently stopped for processing operations, then processing can be performed on the web, but friction variation causes positioning accuracy to deteriorate
Solution Approach 1:
The vacuum plate is made dynamically movable along the transport direction rather than being stationary. The controller adjusts the vacuum plate's position and speed dynamically to maintain a predetermined relative speed with the web during indexer operations, compensating for friction variations and ensuring consistent positioning accuracy throughout the processing cycle
Solution Approach 2:
The system implements closed-loop control where the controller continuously monitors the web position and indexer operation state, then adjusts the vacuum plate's movement accordingly. This feedback mechanism ensures the relative speed between the vacuum plate and web is maintained within the desired range, correcting positioning deviations in real-time
2Manufacturing precision
If the vacuum plate is moved to maintain relative speed, then positioning accuracy is improved, but system complexity increases
Solution Approach 1:
The vacuum plate serves multiple functions: it provides vacuum tension to the web, acts as a movable reference surface for friction compensation, and functions as a position reference for the indexer. By making the existing vacuum plate movable rather than adding separate components, the system achieves friction compensation with minimal additional complexity
Solution Approach 2:
The vacuum plate's movement automatically compensates for friction effects through its own motion, eliminating the need for separate friction compensation mechanisms. The system uses the vacuum plate's inherent vacuum holding capability combined with its controlled movement to self-correct positioning issues
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
This approach enhances the precision and accuracy of web positioning by maintaining a consistent and predictable frictional force, allowing for precise placement of devices on the web during processing, even when the web is stopped, thereby improving the overall efficiency and reliability of the web processing system.
Implementation Method 1
a tensioner with a vacuum plate configured to provide tension on a flexible substrate as the flexible substrate is transported over the vacuum plate
Implementation Method 2
maintaining a relative speed between the indexer and the vacuum plate of the tensioner above a predefined threshold under all working conditions, even when the flexible substrate is stopped
Data Source
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AI summary
A processing system and a method for processing a flexible substrate (e.g., a web) use a tensioner with a vacuum plate that can be moved along a transport direction of the flexible substrate with an indexer that intermittently moves the flexible substrate for processing. The tensioner and the indexer are controlled so that a relative speed between the indexer and the vacuum plate of the tensioner is maintained above a predefined threshold under all working conditions, even when the flexible substrate is stopped.