Absorbent Core Segmentation for Leakage Prevention
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Solution Overview
Problem
Conventional absorbent articles, such as disposable diapers, face issues with the absorbent member gathering towards the center when an external force is applied, leading to discomfort and potential leakage, due to the lack of structural features that prevent central bulging and side leakage.
Innovation Solution
The absorbent article incorporates a sheet-like absorbent core with longitudinally oriented absorbent units, featuring longitudinal and lateral joined regions, and intermediate lateral joined regions, which are joined to a constituent member using a hot-melt adhesive, allowing the absorbent units to return to their original position when compressed, thereby preventing central bulging and side leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the absorbent member is made from conventional materials without specific structural features, then the manufacturing process is simple, but the absorbent member gathers towards the center when external force is applied, causing discomfort and potential leakage
Solution Approach 1:
The absorbent core is divided into multiple absorbent units arranged in a grid pattern with longitudinal and lateral divisions. This segmentation creates a structured framework that prevents central gathering while maintaining manufacturing feasibility through systematic arrangement of standardized units.
Solution Approach 2:
The absorbent units are oriented with their longitudinal directions aligned in the article longitudinal direction, creating anisotropic local properties. This directional arrangement provides differential response to compression forces, preventing central bulging while maintaining overall absorbency distribution.
2Stability of the object's composition
If the absorbent units are arranged without specific orientation, then the manufacturing process is simpler, but the absorbent member lacks the ability to return to original position when compressed, leading to central bulging
Solution Approach 1:
The absorbent units are pre-oriented with their longitudinal directions aligned in the article longitudinal direction before final assembly. This preliminary orientation ensures that when compression occurs, the units can elastically return to their original positions, preventing central bulging while maintaining manufacturing efficiency through standardized unit preparation.
3Reliability
If the absorbent core is made as a single continuous piece, then the structure is simple, but it cannot allow absorbent units to move freely, inhibiting swelling and reducing absorption performance
Solution Approach 1:
The absorbent core is segmented into multiple discrete absorbent units separated by spaces in both longitudinal and lateral directions. This segmentation allows each unit to expand and swell freely in response to fluid absorption without being constrained by a continuous structure, thereby maintaining high absorption performance while creating a grid-like structured arrangement.
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 enhances the softness and leakage preventability of the absorbent article, ensuring comfort and effective fluid absorption by allowing absorbent units to move freely and preventing swelling inhibition, thus maximizing the absorption performance.
Implementation Method 1
water-absorbent polymer particles that are fixed to a surface of at least one face of the long base portion
Implementation Method 2
the absorbent units to return to their original position when compressed, thereby preventing central bulging and side leakage
Implementation Method 3
The sheet-like article is joined at the longitudinal joined regions, the lateral joined regions, and the intermediate lateral joined region to a constituent member that constitutes the absorbent article
Implementation Method 4
joined to a constituent member using a hot-melt adhesive
Data Source
AI summary
A diaper (10) includes an absorbent assembly (20) including a topsheet (21), a backsheet (22), and an absorbent core (24), and has an article longitudinal direction (X) and an article lateral direction (Y). The absorbent core (24) is formed of a sheet-like article (1) including a plurality of absorbent units (4), each including a long base portion (2) and water-absorbent polymer particles (3). The sheet-like article (1) includes a plurality of unit portions arranged in the longitudinal direction (x1 direction), each unit portion including a plurality of the absorbent units (4) arranged side by side in the lateral direction (y1 direction). The sheet-like article (1) includes a pair of longitudinal joined regions (41, 41), a pair of lateral joined regions (42, 42), and intermediate lateral joined regions (43, 43). The sheet-like article (1) is joined to a constituent member adjacent thereto in the thickness direction (Z) at the pair of longitudinal joined regions (41, 41), the pair of lateral joined regions (42, 42), and the intermediate lateral joined regions (43, 43). Each unit portion includes a section in which neither the upper side nor the lower side thereof in the thickness direction (Z) is joined to the constituent member.