Absorbent Article Folding With Repitch Speed Reduction for Grouping
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Solution Overview
Problem
Existing methods for folding absorbent sanitary articles at high speeds risk damaging the articles due to impact with folding blades and often result in production stops from uncontrolled movement, especially when packaging multiple folded products.
Innovation Solution
A method and apparatus that slows down absorbent sanitary articles before folding using rotating repitch devices, allowing them to be folded around transverse axes at a reduced speed, and routes them to form groups for packaging, reducing the risk of damage and preventing production jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If absorbent sanitary articles are folded at high speeds using impact folding blades, then productivity is improved, but the articles are damaged due to repeated impacts
Solution Approach 1:
The patent replaces the traditional mechanical impact folding system with a belt-based folding system. The articles are conveyed on belts that move at controlled speeds, and folding is achieved through the interaction between belts moving at different speeds rather than through impact blades. This substitution eliminates the damaging repeated impacts while maintaining folding functionality.
Solution Approach 2:
The patent changes the speed parameter dynamically during the folding process. The belts are configured to move at different speeds, with the first pair of belts moving faster than the second pair. This speed differential is carefully controlled to enable folding while preventing damage, transforming the constant high-speed impact into a controlled speed-transition process.
2Reliability
If folded articles are slowed down using belt speed differential, then damage risk is reduced, but production stops occur due to uncontrolled movement and jams
Solution Approach 1:
The patent incorporates a control system that monitors the position and movement of articles during the speed transition process. This feedback mechanism allows the system to adjust belt speeds and timing to prevent uncontrolled movement and jams, ensuring continuous production while safely slowing down articles for packaging.
Solution Approach 2:
The patent employs dynamic speed adjustment of the conveyor belts rather than abrupt slowing. The belts transition from high speed to low speed in a controlled, progressive manner, allowing articles to adapt to the speed change without becoming uncontrolled. This dynamic approach maintains production continuity while protecting article integrity.
3Productivity
If multiple folded products are packaged together, then packaging efficiency is improved, but the complexity of managing overlapping folded products increases
Solution Approach 1:
The patent performs preliminary folding and positioning of articles on the conveyor belts before they reach the packaging station. By the time articles arrive at packaging, they are already properly folded, oriented, and spaced, which simplifies the packaging process and enables efficient multi-article packaging without requiring complex handling mechanisms.
Data Source
AI summary
A method for folding absorbent sanitary articles, wherein a plurality of absorbent sanitary articles advancing at a first speed are alternately routed towards at least two folding lines, are slowed down to a second speed less than the first speed, are folded while advancing at the second speed and are overlapped with each other so as to form groups of articles, each of which comprises at least two folded absorbent sanitary articles overlapped with each other.