Lotioned Topsheets with Channel Overlap Control
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Solution Overview
Problem
Existing absorbent articles face challenges in maintaining effective skin protection while ensuring the quality of fluid absorption and distribution, particularly due to interactions between the lotion and underlying layers that can weaken adhesive bonds.
Innovation Solution
The absorbent article features a lotion application pattern with minimized overlap over channels in the intermediate layer, ensuring the lotion does not interact negatively with adhesives, and includes a distribution layer with longitudinally-extending channels that facilitate fluid acquisition and distribution, enhancing skin protection and adhesive bond strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lotion is applied on the topsheet to provide skin protection, then skin protection properties are improved, but adhesive bond strength deteriorates due to interaction between lotion and underlying adhesives
Solution Approach 1:
The lotion application is segmented into specific patterns (stripes or blocks) rather than continuous coverage. The lotion is applied only in selected regions of the topsheet, creating discrete application zones that avoid critical adhesive areas while maintaining skin protection in high-contact regions.
Solution Approach 2:
Different regions of the topsheet have different lotion application characteristics. High-lotion areas are placed where skin contact and protection are most needed, while low or no-lotion areas are positioned over adhesive zones to preserve bond strength. This creates spatially varying lotion distribution optimized for both protection and bonding.
2Productivity
If intermediate layers are added to improve fluid acquisition and distribution, then fluid management is improved, but device complexity increases
Solution Approach 1:
The intermediate layer is designed to perform multiple functions simultaneously: fluid acquisition through capillary action, fluid distribution across the core, and structural support for the topsheet. By combining these functions in a single layer with specific material properties and channel architecture, the patent avoids adding separate layers for each function.
Solution Approach 2:
The intermediate layer utilizes porous materials with controlled pore size and distribution to achieve fluid acquisition and distribution. The porous structure provides capillary channels for fluid movement while maintaining breathability and flexibility, eliminating the need for additional non-porous barrier layers.
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 design improves skin protection and maintains adhesive bond strength over time by minimizing lotion-channel overlap, leading to better fluid management and prolonged effectiveness of the absorbent article.
Implementation Method 1
The lotion typically comprises hydrophobic skin-friendly ingredients as in a skin cream... where it provides barrier properties against humidity and feces to reduce potential skin irritation
Implementation Method 2
an acquisition layer having a high capillarity which pulls the fluid quickly away from the topsheet
Implementation Method 3
an absorbent core for retaining the fluid
Data Source
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AI summary
An absorbent article having a longitudinal axis extending in a longitudinal direction and a transversal axis extending in a transversal direction perpendicular to the longitudinal direction. The absorbent article comprises a fluid-permeable topsheet, a lotion on the topsheet having a lotion pattern covering a lotion pattern area, a fluid-impermeable backsheet, and an absorbent core between the topsheet and the backsheet. The core wrap defines a core footprint in a plane parallel to the longitudinal direction and transversal direction. The article comprises an intermediate layer between the topsheet and the absorbent core, the intermediate layer comprising at least one longitudinally-extending channel, preferably at least a pair of longitudinally-extending channels disposed symmetrically on each side of the longitudinal axis. The topsheet is depressed in the channel(s). The lotion-to-channel overlap ratio ranges from 0% to 20% of the area of the channel(s). The lotion-to-channel overlap ratio is the percentage of the channel(s) of the intermediate layer overlapping with the lotion pattern.