Folding Machine Web Phase Alignment via Variable Pressing
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Solution Overview
Problem
Existing folding machines for absorbent articles face challenges in maintaining alignment and reducing phase misalignment due to differences in stress application between webs, leading to potential defects and the need for frequent adjustments in roll speeds when web conveyance speed changes or when replacing webs.
Innovation Solution
A folding machine with a press mechanism that includes a variable roll and position changer, allowing for adjustment of pressing strength on the webs to align side edges and prevent phase misalignment by changing the lengths of the tracks on which the side edges are conveyed, eliminating the need to adjust roll speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the revolution speed of the large-diameter roll and guide rolls is adjusted to maintain phase alignment, then the alignment between webs is improved, but the device complexity and operational burden increase due to frequent recalibration needs
Solution Approach 1:
The patent changes the parameter of pressing strength applied to the webs by the press mechanism. By adjusting the pressing strength on one web relative to the other, the track lengths are modified to compensate for phase misalignment, eliminating the need for complex speed adjustments of multiple rolls
Solution Approach 2:
The patent extracts the speed adjustment requirement by introducing a press mechanism that compensates for phase misalignment through differential pressing. This removes the need to adjust the revolution speeds of the large-diameter roll and guide rolls, simplifying the control system
2Manufacturing precision
If the revolution speed of rolls is adjusted to compensate for phase misalignment, then the alignment is improved, but the loss of time increases due to frequent stopping for recalibration
Solution Approach 1:
The press mechanism is positioned to apply pressing strength before the webs complete their traversal, allowing phase alignment to be corrected proactively during normal operation rather than requiring stopping for recalibration after misalignment occurs
Solution Approach 2:
The press mechanism enables continuous phase alignment correction during web conveyance without interrupting the manufacturing process. The pressing action is maintained continuously to ensure ongoing alignment rather than periodic recalibration
3Ease of manufacture
If different stresses are applied to the two webs during conveyance, then the folding process is simplified, but the manufacturing precision deteriorates due to phase misalignment
Solution Approach 1:
The press mechanism applies localized pressing strength to specific regions of the webs (first region and second region) to create differential stresses that compensate for phase misalignment. This local quality adjustment allows the folding process to proceed while maintaining precision through targeted stress application
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 solution simplifies the adjustment of phase misalignment and prevents defects in absorbent articles by automatically adjusting the pressing strength, ensuring consistent quality without requiring frequent recalibration of roll speeds.
Implementation Method 1
a press mechanism provided downstream of the reference roll in the machine direction, and configured to press at least any one of the first region and the second region
Data Source
AI summary
A folding machine includes a conveyance roll configured to come into contact with both a first region and the second region being flush with each other; a web guide mechanism configured to cause the first region and the second region to face each other with reference to the folding line so that an angle between the first region and the second region becomes smaller toward downstream; a press mechanism configured to press at least any one of the first region and the second region. The press mechanism changes a pressing strength on the web to change at least either a track length (first track length) in which one side edge provided on a downstream of a conveyance roll is conveyed or a track length (second track length) in which other side edge is conveyed.