Carrier Unit Rotation for Absorbent Article Segment Orientation
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Solution Overview
Problem
Current machinery for producing absorbent articles, such as nappy waistbands, lacks the performance and flexibility to meet market demands for higher production speeds and reduced changeover times when switching between different article sizes.
Innovation Solution
A device comprising a cutting station and an applicator station, with carrier units that rotate to transfer and orient segments of elasticized material, allowing for efficient transfer and application of segments on absorbent articles, and featuring a first and second movement member to control the carrier units' movement without replacing mechanical motion transmission parts, enabling speeds of at least 1000 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If prior art devices use a drum with pads that rotate and move radially to transfer segments, then the device can apply segments to absorbent articles, but the production speed is limited and changeover time between different article sizes is excessive
Solution Approach 1:
The device divides the continuous web into individual segments using a cutting means with anvils that separate the web into discrete portions. Each pad receives and transfers individual segments independently, allowing parallel processing and high-speed operation without requiring the entire system to slow down during changeovers.
Solution Approach 2:
The pads are made movable with respect to the drum, allowing them to adjust their position dynamically. Each pad can move away from the main axis of rotation to a position tangent to the absorbent articles, and move back toward the axis to return to the picking position. This dynamic adjustment enables rapid changeover between different article sizes without replacing mechanical parts.
2Ease of operation
If pads rotate about their own axis to orient segments transversely, then the segments are correctly positioned for application, but the mechanical complexity increases with multiple rotation axes
Solution Approach 1:
The device combines multiple functions into the pad assembly: the pad both receives segments from the cutting station and orients them through rotation about its own axis. The radial movement of the pad relative to the drum and the rotational movement about the pad's axis are integrated into a single coordinated mechanism, reducing the need for separate transmission systems.
Solution Approach 2:
The pads serve multiple functions: they receive continuous web segments, hold individual segments, transfer them to the applicator station, and orient them transversely through rotation. This multi-functionality reduces the number of separate components needed and simplifies the overall mechanical system.
Data Source
AI summary
A device for applying segments of absorbent articles includes a cutting station for cutting a continuous web into segments and an applicator station for applying each segment on a respective absorbent article. A plurality of carrier units, each includes a pad for retaining and transferring a segment from the cutting station to the applicator station. The pad fully rotates about a main axis to transfer the segment from the cutting station to the applicator station and return to the cutting station and, from the cutting station to the applicator station, rotates at least 90° about its axis of rotation to orient the segment transverse to the feed direction of the absorbent article. A first movement member moves one or more first carrier units about the main axis and a second movement member moves one or more second carrier units separately from the first carrier units about the main axis.