Diaper Elastic Member Crossing Position for Gap Prevention
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Solution Overview
Problem
The existing trunks-type disposable diapers face issues with the front and back around-leg elastic members crossing outside the absorber's narrower portion, leading to contraction forces that shorten the inner thigh contact portion, deteriorate the wearing feeling, and cause gaps due to the elastic members attracting the inner thighs to the center.
Innovation Solution
The elastic members are positioned such that the crossing point is aligned with the side edge of the absorber's narrowest portion or further towards the center, and a non-stretchable region is created to prevent contraction, ensuring the elastic members do not expand or contract with the inner member, maintaining continuous fitting along the leg openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front around-leg elastic member and the back around-leg elastic member are attached in a pattern where they cross each other on both sides in the width direction of an intermediate region between leg openings, then the fitting of the cylindrical leg portion is improved, but the contraction force attracts the inner thigh contact portion to the center, shortening its length and causing gaps with the skin
Solution Approach 1:
The patent applies local quality by creating a non-stretchable region in the crotch portion where the elastic members are cut, while maintaining stretchability in other regions. This localized modification allows the elastic members to provide fitting force in the leg portions while preventing unwanted contraction in the inner thigh contact portions, thus resolving the contradiction between improved fitting and comfortable wearing feeling.
Solution Approach 2:
The elastic members are segmented into stretchable regions and non-stretchable regions by cutting them at specific positions. The non-stretchable region is located in the crotch portion to prevent attraction of inner thigh contact portions to the center, while the stretchable regions maintain elasticity for fitting. This segmentation resolves the contradiction by allowing differential behavior in different sections of the same elastic member.
2Reliability
If the crossing position of the elastic members is positioned outside the side edge of the narrower portion of the absorber, then the elastic members are continuously present along leg openings, but the contraction force in the width direction shortens the inner thigh contact portion
Solution Approach 1:
The patent creates a local non-stretchable region in the crotch portion by cutting the elastic members, while maintaining their continuous presence and stretchability along the leg openings. This localized modification prevents the contraction force from acting on the inner thigh contact portions while preserving the continuous fitting function along the leg openings, thus resolving the contradiction between continuous presence and maintaining length.
3Reliability
If elastic members are attached to provide both fitting to the leg and absorption amount, then the cylindrical leg portions surround root sides of the thighs, but the crossing pattern causes the elastic members to attract inner thighs to the center
Solution Approach 1:
The elastic members are divided into stretchable regions for providing fitting force and non-stretchable regions in the crotch portion to prevent harmful attraction. By segmenting the elastic members and controlling their stretchability locally, the patent eliminates the harmful effect of gap formation while maintaining the beneficial fitting function.
Solution Approach 2:
The patent applies local quality by creating a non-stretchable region specifically in the crotch portion where the elastic members are cut, while maintaining stretchability in the leg portion regions. This localized modification prevents the harmful attraction of inner thighs to the center while preserving the fitting function, thus eliminating gap occurrence.
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 configuration prevents the shortening of the inner thigh contact portion, improves the wearing feeling, and avoids the occurrence of gaps by controlling the contraction force and maintaining the integrity of the elastic members' positioning.
Implementation Method 1
a front around-leg elastic member and a back around-leg elastic member are attached on both front and back sides of the outer member in a pattern of extending from one of side seal portions toward the center in the width direction along the edges of leg openings
Data Source
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AI summary
The problem of the present invention is to prevent shrinkage in the width direction of an inner thigh contact portion and to prevent wearing feeling and occurrence of a gap. The above-described problem is solved in that a crossing position (C1) of a front around-leg elastic member (27) and a back around-leg elastic member (26) positioned closest to an edge (29) of a leg opening is positioned at the same position in a width direction (WD) as a side edge of the narrowest portion of a narrower portion (13N) of an absorber (13) or on the center side in the width direction (WD), and a crotch portion (28) does not have elastic members other than the front around-leg elastic member (27) and the back around-leg elastic member (26).