Trunks-Type Diaper Leg Elastic Layout Without Crossing Bonded Regions
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Solution Overview
Problem
The elasticity of the front and back around-leg elastic members in trunks-type disposable diapers is compromised when they cross each other within the inner member, resulting in reduced fitting and comfort.
Innovation Solution
The elastic solutions are arranged such that they do not cross within the inner member bonded region, ensuring continuity along the leg opening, and the inner member bonded region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front around-leg elastic member and the back around-leg elastic member cross each other within the inner member bonded portion, then the elastic members are continuously present along leg openings improving fitting, but the elasticity is decreased at the crossing position due to expansion and contraction with the inner member
Solution Approach 1:
The patent divides the around-leg elastic members into multiple segments: a first around-leg elastic member extending from the side seal portion toward the center, and a second around-leg elastic member extending from the center toward the other side seal portion. This segmentation allows the first and second elastic members to be positioned on opposite sides of the inner member bonded portion, eliminating the crossing within the bonded region while maintaining continuous elastic coverage along the leg opening.
Solution Approach 2:
The patent introduces an intermediary arrangement where the center line of the diaper serves as a reference to position the first and second around-leg elastic members on opposite sides of the inner member bonded portion. This intermediary positioning strategy allows the elastic members to maintain continuity along the leg opening while avoiding the harmful crossing within the bonded region, thus preserving their elasticity.
2Strength
If the front around-leg elastic member and the back around-leg elastic member do not cross each other, then the elasticity is maintained, but the continuous presence along leg opening is reduced
Solution Approach 1:
The patent segments the around-leg elastic members into first and second elastic members that are positioned on opposite sides of the inner member bonded portion. Although they do not cross, they collectively provide continuous elastic coverage along the leg opening by extending from the side seal portions through the center to the other side seal portions, thus maintaining both elasticity and fitting reliability.
Solution Approach 2:
The patent combines the functions of multiple elastic members (front around-leg elastic member consisting of first and second segments, and back around-leg elastic member consisting of first and second segments) to achieve continuous elastic coverage. The merging of these members' effects along the leg opening provides the same fitting benefit as a single continuous elastic member would, while avoiding the crossing problem.
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
The elastic members are arranged such that they do not cross within the inner member bonded region, ensuring the fit and reducing the gap between the leg opening.
Implementation Method 1
a front around-leg elastic member and a back around-leg elastic member are attached on the 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 not to deteriorate the fitting at a portion including a crossing position between a front around-leg elastic member and a back around-leg elastic member in a state in which the front around-leg elastic member and the back around-leg elastic member cross each other and substantially extend along a leg opening. In a trunks-type disposable diaper in which a front around-leg elastic member (27) and a back around-leg elastic member (26) are attached on both sides in a width direction (WD) of an intermediate region (22) in a region between an edge (29) of one leg opening and an edge (29) of the other leg opening in a pattern in which at least one front around-leg elastic member (27) and at least one back around-leg elastic member (26) cross each other, the above-described problem is solved by providing an inner member bonded portion (18) that is a region bonding an outer member (20) and an inner member (10) only further to the center side in the width direction than a crossing position (C1) between the front around-leg elastic member (27) and the back around-leg elastic member (26) on both sides in the width direction in the intermediate region (22) .