Absorbent Article Compressed Sheet Fixing Against Wetness Peeling
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Solution Overview
Problem
The intermediate fixing portions in absorbent articles, particularly at the crotch portion, tend to peel off due to friction and wetting, leading to poor joining between the leakproof wall portions and the absorbent body.
Innovation Solution
The absorbent article features a design with front, back, and intermediate fixing portions that utilize a hydrophilic skin-side sheet impregnated with adhesive, where the adhesive overlaps compressed portions in the thickness direction, enhancing the joining strength and preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixing portions are disposed in the vicinity of the crotch portion to join leakproof wall portions and absorbent body, then the leakproof wall portions can be firmly joined to prevent leakage, but the fixing portions are likely to peel off due to friction or wetting
Solution Approach 1:
The skin-side sheet is compressed in advance to form compressed portions with reduced thickness before adhesive application. This preliminary compression creates a mechanical interlocking structure that prevents peeling when the adhesive cures, addressing the peeling problem before it occurs during use
Solution Approach 2:
The fixing portion combines multiple materials: the skin-side sheet, the compressed portions (formed by compression), and the adhesive. This composite structure creates a multi-layered joining mechanism where the compressed portions provide mechanical retention while the adhesive provides chemical bonding, collectively preventing peeling against friction and wetting
2Strength
If adhesive is applied to join the skin-side sheet and leakproof wall portions, then strong joining is achieved, but adhesive may exude and cause discomfort
Solution Approach 1:
The skin-side sheet is compressed only at specific locations to form discrete compressed portions, creating localized regions of reduced thickness. The adhesive is applied specifically to these compressed portions rather than uniformly across the entire surface, achieving strong joining while controlling adhesive distribution to prevent exudation
Solution Approach 2:
The compression is applied in the thickness direction to reduce the thickness of the skin-side sheet at specific locations. This dimensional change creates a physical cavity that accommodates the adhesive and prevents it from extruding outward, while still allowing strong bonding
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 maintains strong joining between the leakproof wall portions and the absorbent body, even under conditions of friction and wetting, while maintaining a soft texture and preventing adhesive exudation, thus ensuring effective absorption and fit.
Implementation Method 1
in the intermediate fixing portion, the skin-side sheet being impregnated with at least a part of the adhesive
Data Source
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AI summary
An absorbent article (1) includes: an absorbent body (10); and a pair of leakproof wall portions (40). In an unfolded state, the absorbent body (10) has a front-back direction and a lateral direction that intersect each other. A front fixing portion (51) is provided in a front end portion of the absorbent body (10), and a back fixing portion (52) is provided in a back end portion. An intermediate fixing portion (53) is provided between the front fixing portion (51) and the back fixing portion (52) . In the intermediate fixing portion (53), a predetermined adhesive is provided between a skin-side sheet (12) and the leakproof wall portions (40), and the skin-side sheet (12) is impregnated with at least a part of the adhesive. The skin-side sheet (12) has a plurality of compressed portions (60) in which the skin-side sheet (12) is compressed in the thickness direction. A portion in which the adhesive and the compressed portions (60) overlap in the thickness direction is provided.