Absorbent Article Waistline Elastic Stress and Joining Width
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Solution Overview
Problem
In absorbent articles, the shape of the absorbent body in the rear waistline portion changes significantly between sitting and standing positions, causing a gap between the wearer and the absorbent body, and increasing the extension stress of elastic members in the front waistline portion to enhance contact leads to wrinkles in the front waistline portion.
Innovation Solution
An absorbent article design with a chassis featuring distinct elastic members in the front and rear waistline portions, where the extension stress of the first elastic member is higher than the second, and the joining length between the chassis and absorbent body is shorter in the front waistline portion than in the rear, reducing wrinkles while increasing contact in the rear waistline portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the extension stress of the elastic member in the front waistline portion is increased to enhance contact between the absorbent body and the wearer, then the contact area is improved, but wrinkles are easily caused in the absorbent body at the front waistline portion
Solution Approach 1:
The patent applies local quality by making the joining portion width vary in different regions. Specifically, the width of the joining portion is set to be smaller at the front waistline portion and larger at the rear waistline portion. This localized differentiation allows the front waistline to have sufficient contact area while reducing the extension stress that causes wrinkles, as the narrower joining portion at the front accommodates the higher elastic stress without creating excessive tension on the absorbent body.
2Reliability
If the extension stress of the elastic member in the rear waistline portion is increased to reduce the gap between the wearer and the absorbent body, then the contact area is improved, but the shape change between sitting and standing positions causes a large gap
Solution Approach 1:
The patent applies local quality by differentiating the joining portion width between front and rear waistline regions. The rear waistline portion has a larger joining portion width that accommodates the significant shape changes between sitting and standing positions, allowing the elastic member to exert sufficient stress to maintain contact without causing wrinkles. This localized design enables the rear waistline to handle position changes while the front waistline maintains stable contact.
3Ease of manufacture
If the joining portion width is uniform across both front and rear waistline portions, then the manufacturing is simplified, but it cannot simultaneously reduce wrinkles at the front and maintain contact at the rear
Solution Approach 1:
The patent implements local quality through a non-uniform joining portion width design where the width varies between front and rear waistline portions. This approach prioritizes performance optimization over manufacturing simplicity, as it requires different width specifications for different regions. The design accepts increased manufacturing complexity to achieve the dual benefit of reducing wrinkles at the front waistline while maintaining adequate contact at the rear waistline portion.
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 reduces wrinkles in the front waistline portion while enhancing the contact of the absorbent body in the rear waistline portion with the wearer, improving absorption performance and comfort by minimizing the width of the joining portion and increasing the extension stress in the rear waistline portion.
Implementation Method 1
a first elastic member extends in a straight line in the width direction, at the second portion, a second elastic member extends in a straight line in the width direction, an extension stress of the first elastic member is larger than an extension stress of the second elastic member
Implementation Method 2
a first elastic member extends in a straight line in the width direction, at the second portion, a second elastic member extends in a straight line in the width direction, an extension stress of the first elastic member is larger than an extension stress of the second elastic member
Data Source
AI summary
In the disclosed absorbent article, in a first region, a first elastic member extends linearly in the widthwise direction, in a second region, a second elastic member extends linearly in the widthwise direction, the elongational stress of the first elastic member is greater than the elongational stress of the second elastic member, and the length in the widthwise direction of the joining region that is of both the main body of an absorbent body and a chassis in the first region is configured in a manner so as to be shorter than the length in the widthwise direction of the joining region that is of both the main body of the absorbent body and the chassis in the second region.