Flexible Web Handling With Cross-Grooved Rollers for Wrinkle Control
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Solution Overview
Problem
High-speed printing systems face challenges in handling flexible webs due to material shrinkage, wrinkle formation, and printhead damage from splices or wrinkles, leading to poor print quality and costly downtime.
Innovation Solution
A web handling system with cross-grooved idler rollers, an imaging drum, a nip roller, and a spreader roller, configured with precise spacing and alignment, along with closed-loop control systems to manage web tension and printhead positioning, minimizes wrinkles and protects printheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high speed printing is used to increase productivity, then printing speed increases, but wrinkle formation and printhead damage risk increase
Solution Approach 1:
The web handling system performs preliminary actions by precisely controlling web tension and alignment before the web reaches the printheads. The system uses pre-positioning mechanisms and tension control devices upstream of the printing zone to ensure the web is properly prepared, reducing the risk of wrinkles and printhead damage during high-speed operation
Solution Approach 2:
The patent introduces intermediary elements such as guide rollers, tension control devices, and alignment mechanisms that act as mediators between the web and printheads. These intermediaries buffer and control web movements, preventing direct contact between wrinkles/splices and printheads even at high printing speeds
2Productivity
If high speed printing is used to increase productivity, then printing speed increases, but wrinkle formation increases leading to poor print quality
Solution Approach 1:
The system performs preliminary web stabilization and tension control before the web enters the printing zone. By pre-conditioning the web with proper tension and alignment upstream, the system prevents wrinkle formation during high-speed printing, maintaining print quality without sacrificing productivity
Solution Approach 2:
Guide rollers and tension control devices serve as intermediaries that smooth web transitions and prevent wrinkle formation. These components mediate between the high-speed web transport and the printing process, ensuring consistent web flatness and alignment for high-quality printing at elevated speeds
3Manufacturing precision
If web tension is increased to prevent wrinkles, then wrinkle formation decreases, but material deformation and shrinkage control become difficult
Solution Approach 1:
The system applies different tension levels at different locations along the web path. By creating localized tension zones with varying force levels, the system prevents wrinkles in critical areas while maintaining overall material stability and shrinkage control in other regions
Solution Approach 2:
The patent employs dynamic tension control that adjusts web tension in real-time based on web conditions, speed, and material properties. This dynamic adjustment allows the system to maintain optimal tension for wrinkle prevention while adapting to material shrinkage characteristics, preventing both wrinkles and excessive deformation
Data Source
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AI summary
According to one aspect, a web handling system comprises a plurality of cross-grooved idler rollers, an imaging drum, a nip roller adjacent the imaging drum and forming a nip therewith, and a spreader roller disposed between the plurality of idler rollers and the nip roller. Each idler roller is disposed no more than a first distance from an adjacent idler roller, spreader roller, and nip roller and the spreader roller is disposed no more than a second distance from the nip. The first distance is in a range of 38 to 28 inches, 36 to 30 inches, or 35 to 33 inches and the second distance is in a range of 6 to 11 inches, 6.5 to 9 inches, or 7.0 to 8.5 inches.