Tool Holder Roller Control for Fast Web Format Changes
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Solution Overview
Problem
Existing apparatuses for treating continuous moving webs, such as those used in producing absorbent sanitary articles, require complex and time-consuming format changes due to the need to replace rotary tools and perform delicate adjustments, which can damage tools and limit space usage.
Innovation Solution
An apparatus with a tool holder roller and an anvil roller, controlled by a control device, allows for format changes by switching between operating conditions via software, enabling tools to cooperate or not cooperate with anvil elements without physical replacement or adjustments, using different tools with varying geometries and speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rotary tools are replaced to adapt to new article formats, then the apparatus can process different sized articles, but the format change becomes complex and time-consuming
Solution Approach 1:
The tool holder roller is designed to be dynamically adjustable along the rotation axis, allowing tools to be positioned at different radial distances from the rotation axis. This dynamic positioning enables the same physical tool to effectively change its operational width and geometry to accommodate different article formats without requiring tool replacement
Solution Approach 2:
The system changes operational parameters by varying the radial position of tools on the roller and their rotational speeds. By adjusting these parameters, the apparatus can process different formats using the same physical tools, eliminating the need for time-consuming tool replacement operations
2Adaptability or versatility
If rotary tools are replaced for format changes, then different article sizes can be processed, but delicate adjustment operations are required that may damage tools
Solution Approach 1:
The tool holder roller allows dynamic repositioning of tools along the rotation axis without requiring delicate manual adjustments. The mechanical design enables tools to be secured at different positions through controlled movement rather than fragile alignment procedures, reducing the risk of tool damage
Solution Approach 2:
The system enables self-adjustment of tool positions and operational parameters through automated control mechanisms. The tool holder roller can be repositioned and tools reconfigured without requiring operator intervention for delicate adjustments, thereby preventing tool damage from manual handling
3Adaptability or versatility
If the complete rotary unit is replaced for format changes, then new formats can be processed, but space requirements for lifting devices are increased
Solution Approach 1:
The tool holder roller is designed as a multi-functional component that can accommodate different tool configurations and positions for various article formats. This universal design eliminates the need for complete unit replacement, allowing format changes without requiring additional space for lifting and removing entire rotary assemblies
Solution Approach 2:
The system segments the tool holding function from the complete rotary unit, allowing independent adjustment of the tool holder roller while the main rotary structure remains in place. This segmentation enables format changes without moving or replacing the entire unit, reducing space requirements for format change operations
4Adaptability or versatility
If tools are positioned closer to the rotation axis for narrower formats, then narrow articles can be processed, but tool speed increases which may affect processing quality
Solution Approach 1:
The system independently controls the rotational speed of the tool holder roller separate from the anvil roller speed. When tools are repositioned closer to the rotation axis for narrow formats, the control device adjusts the roller's rotational speed to maintain appropriate linear tool speed, preventing quality issues while preserving format adaptability
Solution Approach 2:
The system dynamically adjusts operational parameters including rotational speeds based on tool position and format requirements. The control device modifies speeds in real-time to compensate for changes in effective tool diameter, ensuring consistent processing quality across different formats
Data Source
AI summary
An apparatus for treating a moving continuous web includes a tool holder roller, an anvil roller and a control device configured to rotate the tool holder roller and the anvil roller around respective rotation axes in at least one first operating condition and one second operating condition, so as to carry out a change of format of the apparatus with a selection via software.