Incontinence Article Crotch Section Overlap Design
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Solution Overview
Problem
Incontinence articles in the form of briefs face challenges in forming a stable connection between the crotch and abdominal/back sections without compromising wearing comfort or functionality, often resulting in stiffening and undesirable tensile stresses due to excessive adhesive use or elasticization.
Innovation Solution
The design features a crotch section with a large overhang and tapered edge contours to create a significant overlapping area with the abdominal and back sections, allowing for a secure connection with reduced adhesive use and strategically placed elasticizing means to manage tensile forces, ensuring comfort and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large amount of adhesive material is used to produce a stable connection between the crotch section and the stomach section or back section, then the connection stability is improved, but the chassis materials become stiffened and cannot stretch as desired
Solution Approach 1:
The connection area is divided into multiple discrete adhesive application zones rather than a continuous large area. The adhesive is applied in specific patterns (e.g., strips, dots, or localized zones) at the boundaries of the crotch section overlapping areas, providing sufficient connection stability while leaving the central chassis materials free of adhesive to maintain their elastic stretchability.
Solution Approach 2:
Different regions of the chassis materials have different adhesive application characteristics. The areas requiring connection stability (at the overlapping boundaries) receive adhesive application, while the central areas requiring stretchability remain free of adhesive. This creates local quality variations where each region has the properties needed for its specific function.
2Adaptability or versatility
If extensive elasticization is applied to the chassis materials, then the adaptability to different body sizes is improved, but the tensile stresses in the joint areas increase significantly
Solution Approach 1:
The adhesive connections are pre-positioned at the overlapping boundaries of the crotch section with the stomach and back sections before the elasticizing means are applied. This preliminary placement of connection points ensures that the elasticization forces are distributed along predetermined paths that avoid concentrating stress at the joints, allowing the chassis materials to stretch adaptively while maintaining connection stability.
3Stability of the object's composition
If the crotch section is designed with a large overhang to create significant overlapping area, then the connection stability is improved, but the device complexity increases
Solution Approach 1:
The crotch section is designed to overlap with both the stomach section and the back section, merging the connection functions into a single integrated component design. This overlapping configuration allows the crotch section to simultaneously connect with both adjacent sections, providing enhanced connection stability through a unified structural approach rather than requiring separate connection mechanisms.
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 achieves a secure connection between the crotch and abdominal/back sections without stiffening the chassis materials, enhancing wearing comfort by distributing tensile forces effectively and maintaining the absorbent body's absorption performance.
Implementation Method 1
elasticizing means, in particular in the form of tapes or threads, often referred to as Lycra threads, are connected to the chassis materials of the incontinence article in a pre-stretched state (stretch-bond method), i.e. they are attached to the chassis materials in a pre-stretched state, e.g. fixed with glue. As a result of their prestressing, these elasticizing means gather the chassis materials together and form folds in the process.
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
The article (2) has an elasticizing unit (28) provided in a belly section (4) and a back section (6). An absorption body (7) is arranged between a liquid-impermeable back sheet material and a top sheet material of a crotch section (8). A projection (62) of the back and top sheet materials is of 25 percentages in a transverse direction (16) over both sides of the body with respect to a maximum width of the crotch section. The crotch section overlaps 12 percentages of a surface of the bulge section and 20 percentages of the surface of the back section.