Absorbent Core Perimeter Seal Layout for Conformable Fluid Handling
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Solution Overview
Problem
Existing absorbent articles face challenges in providing a comfortable, conformable fit while maintaining structural integrity and efficient fluid handling, often requiring costly and complex manufacturing processes due to the use of densified materials and full perimeter seals.
Innovation Solution
The absorbent articles feature an absorbent core structure with resilient upper and lower nonwoven layers that contain a cellulose-rich inner core layer through a lateral perimeter seal, allowing for reduced material usage and simpler manufacturing by omitting a full perimeter seal, while maintaining shape and fluid management capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive coatings are used to bond the wraparound flange to the core, then bonding is achieved, but adhesive failure can occur under high stress and the adhesive may stain the consumer's skin
Solution Approach 1:
The adhesive layer is completely removed from the absorbent core structure. Instead of using adhesive to bond the wraparound flange to the core, the patent uses a mechanically integrated design where the flange is formed as an integral part of the core structure, eliminating adhesive-related failures and skin staining issues.
Solution Approach 2:
The wraparound flange is designed as a flexible integral structure that can conform to the contours of the absorbent core. This flexible membrane structure provides mechanical bonding without requiring adhesive, allowing the flange to wrap around and secure to the core through its own structural properties.
2Ease of operation
If the absorbent core is made flexible to conform to body contours, then comfort is improved, but the core may shift or migrate during use
Solution Approach 1:
The absorbent core structure incorporates a flexible wraparound flange that can dynamically adapt to body movements and contours. The flange's flexibility allows it to conform to the body shape while maintaining its gripping function, providing both comfort and stability during physical activity.
Solution Approach 2:
The wraparound flange acts as an intermediary element between the absorbent core and the user's body. It provides a mechanical interface that secures the core in place through friction and conformability, preventing migration while allowing the core to flex with body movements.
3Stability of the object's composition
If a wraparound flange structure is used to prevent core migration, then stability is improved, but the device complexity increases
Solution Approach 1:
The wraparound flange is merged with the absorbent core to form an integral structure. This combining of elements eliminates the need for separate bonding components or additional fastening mechanisms, reducing overall device complexity while maintaining stability through the unified structure's mechanical properties.
Solution Approach 2:
The wraparound flange serves multiple functions simultaneously: it provides structural stability to prevent core migration, conforms to body contours for comfort, and eliminates the need for separate adhesive bonding systems. This multi-functionality reduces the number of components needed in the overall device.
Data Source
Figure 1~2
Figure 3
Figure 3A
AI summary
A disposable absorbent article having a topsheet, a backsheet, and an absorbent core structure therebetween. The absorbent core structure having an upper nonwoven layer, a lower nonwoven layer, and a portion of an inner core layer disposed therebetween. The portion of the inner core layer is contained within the upper and lower nonwoven layers by sealing a portion of the first and second side regions of the upper nonwoven layer with a portion of the first and second side regions of the lower nonwoven layer at a lateral perimeter seal. An adhesive is positioned between the upper and nonwoven layers in the perimeter seal. The lateral perimeter seal is positioned in the middle region and has a longitudinal seal length that is from about 45% to about 90% of the longitudinal inner core length.