3D Apertured Topsheet Structure for Compression-Stable Fluid Flow
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Solution Overview
Problem
Current absorbent articles with textured and/or apertured topsheets suffer from reduced softness, apertures that collapse under compression, and limited three-dimensionality, leading to reduced fluid flow efficiency.
Innovation Solution
The topsheet is designed with apertures having steep side walls, a larger wearer-facing opening area, and a smaller garment-facing opening area, ensuring apertures remain open under compression and maintain fluid flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large aperture openings are formed in the topsheet to enable effective liquid transfer, then fluid flow rate is improved, but visual appeal and tactile softness are reduced
Solution Approach 1:
The patent transforms the traditional two-dimensional aperture (flat opening) into a three-dimensional structure with steep side walls extending downward. This dimensional change allows the aperture to maintain a small surface opening (preserving softness and appearance) while creating a large internal volume (enhancing fluid flow capacity). The steep side walls form channels that guide liquid downward without requiring large surface openings.
Solution Approach 2:
The topsheet incorporates apertures with steep side walls that create a porous-like structure. These structured openings function similarly to porous materials by providing multiple flow paths for liquid while maintaining the integrity and surface properties of the topsheet material. The steep-sided apertures create effective flow channels without compromising the surface characteristics.
2Productivity
If long aperture side walls are formed to create large openings, then fluid flow capacity is improved, but the side walls collapse or fold inward under compressive forces, reducing flow through the apertures
Solution Approach 1:
The patent employs asymmetric geometry in the aperture design, specifically using steep side walls that are angled sharply relative to the topsheet surface. This asymmetric configuration creates structural stability under compression, as the steep angles prevent the side walls from folding inward. The asymmetric shape distributes compressive forces more effectively compared to traditional symmetric, shallow apertures.
Solution Approach 2:
The aperture side walls are formed with specific curvature and angulation rather than straight vertical walls. The curved, steep-sided geometry provides structural reinforcement that prevents collapse under compression while maintaining open flow paths. The controlled curvature of the side walls distributes mechanical stress away from the aperture opening.
3Productivity
If hydrophilic materials are used in the topsheet to absorb and transfer liquid, then liquid transfer is improved, but the topsheet retains liquid and stays wet, which is not preferred
Solution Approach 1:
The patent applies local quality differentiation by creating distinct regions within the topsheet structure. The apertures with steep side walls provide localized high-flow channels for rapid liquid transfer, while the surrounding topsheet material maintains its normal hydrophobic or controlled-absorbency properties. This localized aperture structure enables efficient liquid movement without requiring the entire topsheet to be highly hydrophilic, thus preventing overall wetness retention.
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
The design provides improved softness, maintains aperture openness under compression, and enhances fluid flow rate while minimizing skin markings.
Implementation Method 1
Many absorbent articles, including diapers, rely on capillary action to achieve liquid bodily exudate acquisition and wicking of the bodily exudates away from the skin of a wearer.
Data Source
AI summary
A method is provided for forming a plurality of apertures in a nonwoven substrate for an absorbent article, the substrate defining a first surface and a second surface. A plurality of conical-shaped pins is inserted through the substrate from the first surface to the second surface to form a plurality of corresponding apertures in the substrate.