Absorbent Article Opening Diameter Design to Prevent SAP Leakage
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Solution Overview
Problem
Absorbent articles with heat-embossed dot-like compressed sections often experience increased fiber density around openings, leading to fluid leakage and weakened absorption properties due to pulp fiber or super-absorbent polymer escape.
Innovation Solution
An absorbent article design featuring a liquid-permeable top sheet and a liquid-impermeable back sheet with absorbent body openings that have smaller diameters on the clothing side, preventing pulp fiber or super-absorbent polymer escape without compressing the top sheet to form a film, and using a blood modifying agent to enhance fluid absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the top sheet is compressed to form a film covering the side walls of openings, then pulp fiber or super-absorbent polymer escape is prevented, but fiber density increases around openings causing body fluid leakage and weakened absorption property
Solution Approach 1:
The top sheet is detached from the absorbent body specifically at the openings, creating segmented separation zones. This allows the top sheet to remain attached in most areas (maintaining structure) while being detached at openings (preventing fiber escape without compression). The segmentation resolves the contradiction by localizing the detachment function to specific regions rather than requiring full-sheet compression.
Solution Approach 2:
The top sheet has different attachment states at different locations: attached in most areas for structural integrity, but detached at openings to prevent fiber escape. This local quality differentiation allows the top sheet to simultaneously maintain overall structure while preventing fiber escape without compressing the entire sheet, thus preserving absorption properties in the absorbent body.
2Reliability
If heat embossing treatment is applied to form dot-like compressed sections, then surface material film is formed to cover side walls, but fiber density increases weakening absorption property
Solution Approach 1:
Instead of applying heat embossing treatment across the entire top sheet (as in prior art), the invention segments the treatment to only the opening regions. The top sheet is detached specifically at openings, creating localized compression zones only where needed to cover side walls, while leaving the rest of the absorbent body uncompressed and maintaining its absorption capacity.
Solution Approach 2:
The surface material film formation is localized to specific regions (opening areas) rather than applied uniformly across the entire top sheet. This local quality approach allows side wall coverage at openings while preventing fiber density increase in the broader absorbent body, thus maintaining overall absorption capacity.
3Strength
If fiber density is increased around openings to prevent material escape, then structural integrity is improved, but body fluid absorption and retention is weakened
Solution Approach 1:
The structural reinforcement function is segmented to only the opening regions through localized top sheet detachment and compression. This provides structural integrity where needed (at openings) while leaving the rest of the absorbent body with normal fiber density, maintaining its body fluid absorption and retention capabilities.
Solution Approach 2:
The top sheet compression and fiber density increase are localized to the opening areas only, creating local quality differentiation. This provides enhanced structural integrity at openings to prevent material escape while maintaining lower fiber density and better absorption properties in the bulk absorbent body.
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
Prevents pulp fiber or super-absorbent polymer escape, maintains absorption efficiency, and reduces fluid leakage, while allowing for comfortable wear by rapidly absorbing and retaining body fluids.
Implementation Method 1
the top sheet is detached from the absorbent body at the openings of the top sheet and the openings of the absorbent body
Implementation Method 2
the opening diameter (R2) of the openings on the clothing side of the top sheet is in the range of 0.1 to 3 mm
Implementation Method 3
a liquid-retaining absorbent body comprising pulp fiber and super-absorbent polymer
Implementation Method 4
body fluid absorbed by the absorbent body
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3~4
AI summary
Provided is an absorbent article that can prevent pulp fibers and a superabsorbent polymer (SAP) that constitute an absorbent body from leaking from openings, evening if a top sheet does not cover the side wall portions of the absorbent body at the openings. An absorbent article (1) comprises: a liquid-permeable top sheet (2) having openings (10); a back sheet (3); and an absorbent body (4) having openings (10). At the openings (10) of the top sheet (2) and the openings (10) of the absorbent body (4), the top sheet (2) is detached from the absorbent body (4), and the opening diameter (R2) of the openings (10) in the surface of the top sheet (2) on the clothing side is smaller than the opening diameter (R3) of the openings (10) in the surface of the absorbent article (4) on the skin side.