Absorbent Article Water-Repellent Slit Barrier Leakage
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Solution Overview
Problem
Existing absorbent articles face issues with lateral leakage, visual concerns about leakage, and decreased wearing comfort due to the diffusion of body fluids and the rigidity of leakage-preventing sheets, which can lead to joined portions coming off during use.
Innovation Solution
The absorbent article features slits along the longitudinal direction with a water-repellent second sheet integrated into concave grooves, preventing fluid diffusion and enhancing comfort by maintaining the integrity of the joined portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leakage-preventing sheet is provided to wrap around the side edge of the absorbent body, then lateral leakage is prevented, but the rigidity of the sheet causes joined portions to come off during use, degrading wearing comfort
Solution Approach 1:
The patent replaces rigid leakage-preventing sheets with a flexible elastic sheet that has elasticity in the width direction. This elastic sheet is integrated into the absorbent article through elastic force rather than rigid joining, allowing it to flex with body movements without causing joined portions to come off, thus maintaining both leakage prevention and wearing comfort
Solution Approach 2:
The patent introduces an elastic sheet with dynamic flexibility that can adapt to body movements and changes in shape during use. The elastic sheet stretches and contracts with the wearer's movements, preventing the joined portions from coming off while maintaining continuous leakage protection, unlike static rigid sheets
2Ease of operation
If the absorbent article is made shorter in width to improve comfort, then wearing comfort is improved, but body fluids readily reach the side edges, causing lateral leakage
Solution Approach 1:
The elastic sheet extends beyond the side edges of the absorbent body in the width direction, creating an overlapping structure that provides an additional barrier against lateral leakage. This flexible extension can adapt to the wearer's body contours while maintaining the leakage-preventing function even in shorter-width designs
3Reliability
If the absorbent article is made longer in longitudinal direction to cover wider range, then leakage prevention coverage is improved, but the article becomes bulkier and less comfortable to wear
Solution Approach 1:
The elastic sheet with elasticity in the width direction allows the absorbent article to maintain a compact form factor while providing extended coverage. The elastic material can stretch to cover the necessary area during wear but returns to a compact state when not in use, reducing bulkiness while maintaining leakage prevention coverage
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 effectively prevents lateral leakage, reduces visual concerns, and improves wearing comfort by blocking fluid diffusion and maintaining the structural integrity of the absorbent article during use.
Implementation Method 1
at least a portion included in one of the side surfaces of the concave grooves has water-repellent properties
Data Source
Figure 1
Figure 2~3
Figure 4(A)~4(B)
AI summary
An absorbent body 4 is provided between a liquid permeable topsheet 3 and a liquid impermeable backsheet 2, and a second sheet 6 is provided between the liquid permeable topsheet 3 and the absorbent body 4. Slits 10 that penetrate in the thickness direction are formed along a longitudinal direction on both sides of the absorbent body 4 in the width direction, a body fluid expelling portion corresponding region H is included between the slits, the second sheet 6 is provided along an inner surface of the slits, and concave grooves 11, in which the second sheet 6 and the liquid impermeable backsheet 2 are integrated, are formed in the slits. At least a portion of the second sheet 6 constituting one of the side surfaces of the concave groove 11 has water-repellent properties.