Disposable Diaper Crotch Air Permeability via Segmented Adhesion
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Solution Overview
Problem
Disposable diapers worn for extended periods face challenges in air permeability, particularly at the crotch area where the absorbent body overlaps with the exterior member, leading to decreased moisture discharge and discomfort.
Innovation Solution
The disposable diaper design incorporates an exterior member with inner and outer sheets, featuring front and rear leg elastic members and specific adhering regions to enhance air permeability, allowing for better moisture discharge and improved fit by strategically positioning the absorbent body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the absorbent body is overlapped with the exterior member to secure the absorbent body in position, then the absorbent body positioning is improved, but the air permeability at the overlapping portion decreases
Solution Approach 1:
The exterior member is divided into multiple sheets (first sheet, second sheet, third sheet) with different functions. The first sheet provides absorbent body attachment, the second sheet provides structural support, and the third sheet enhances air permeability. This segmentation allows each layer to contribute to both positioning stability and breathability without compromising either function.
Solution Approach 2:
Different regions of the exterior member are designed with different properties. The crotch part has enhanced air permeability through the three-sheet construction, while other areas maintain standard construction for positioning stability. This local differentiation resolves the contradiction by providing breathability where needed without sacrificing overall securing effectiveness.
2Stability of the object's composition
If adhesive is applied extensively to secure the absorbent body, then the positioning stability is improved, but the air permeability is reduced due to adhesive blocking pores
Solution Approach 1:
The adhesive application is segmented into specific regions rather than continuous coverage. Adhesive is applied only at peripheral portions and specific anchor points of the absorbent body, leaving central and intermediate areas with natural air permeability. This selective segmentation maintains positioning stability while preserving breathability pathways.
Solution Approach 2:
Adhesive is applied with varying density and coverage in different regions. High-adhesive regions are located at corners and edges for secure anchoring, while low-adhesive or no-adhesive regions are maintained in the center and along airflow paths. This local quality differentiation ensures both securing and breathability requirements are met.
3Strength
If the exterior member is constructed with multiple layers for structural integrity, then the mechanical strength is improved, but the air permeability decreases
Solution Approach 1:
The multi-layer construction is segmented into sheets with distinct functions: the first sheet for absorbent body attachment, the second sheet for structural reinforcement, and the third sheet specifically designed for enhanced air permeability. This functional segmentation allows each layer to optimize its specific role without compromising overall performance.
Solution Approach 2:
The third sheet is specifically designed as a porous material with high air permeability characteristics. This porous structure is integrated into the multi-layer construction to ensure that even with multiple layers providing structural integrity, the overall assembly maintains excellent breathability through the crotch part.
Data Source
AI summary
A disposable diaper in which an absorbent body (7) is provided on a crotch part of a pants-shaped exterior member (2), wherein the absorbent body (7) is adhered to a skin-facing side of the exterior member (2) at a first adhering region (14), an inner sheet (5) and an outer sheet (6) of the exterior member (2) are adhered to each other at a second adhering region (16), the second adhering region (16) includes a second middle adhering region (16M) provided at the crotch part, a second central front adhering region (16CF) located anterior thereto so as to overlap with the first adhering region (14) and a second central rear adhering region (16CB) located posterior thereto so as to overlap with the first adhering region (14), and second front non-adhering regions (17F) are formed on both sides of the second central front adhering region (16CF) in the width direction so as to overlap with the absorbent body (7) and/or second rear non-adhering regions (17B) are formed on both sides of the second central rear adhering region (16CB) in the width direction so as to overlap with the absorbent body (7).