Disposable Absorbent Article Chassis Stretchability via Core Area Ratio
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Solution Overview
Problem
Conventional disposable absorbent articles, such as diapers, face challenges in achieving enhanced stretch capability while maintaining cost-effectiveness, simplicity in manufacturing, comfort, and convenience, often requiring complex and costly stretchable materials that complicate production and increase costs.
Innovation Solution
A disposable absorbent article design featuring a non-stretch or low-stretch absorbent core with a reduced surface area, allowing the liner and outer cover to be more extensible, thereby enhancing the stretchability of the chassis without increasing material complexity or cost, by bonding the absorbent core to the liner and outer cover, which inhibits their stretchability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stretchable elastomeric materials are used in the construction of diapers, then stretchability and fit are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The diaper is divided into distinct functional segments: a non-stretch absorbent core and stretchable chassis components (outer cover, bodyside liner, elastic members). This segmentation allows each part to be optimized independently - the absorbent core maintains simplicity and ease of manufacture while the chassis components provide the necessary stretchability for fit and containment.
2Adaptability or versatility
If the surface area of the absorbent core is reduced, then the stretchability of the chassis is enhanced, but the absorption capacity may be compromised
Solution Approach 1:
The absorbent core is strategically positioned to occupy the crotch area where absorption is most needed, rather than uniformly distributing across the entire diaper surface. This local concentration of absorbent material maximizes absorption capacity in the critical region while minimizing the overall surface area that would constrain chassis stretchability.
3Adaptability or versatility
If pleats are used to provide improved fit and containment, then stretchability is enhanced, but manufacturing complexity and equipment requirements increase
Solution Approach 1:
Instead of using static pleats that require precise folding equipment, the invention employs dynamic elastic members and stretchable materials that automatically adapt to the wearer's body contours. The elastic waist and leg members, along with the stretchable outer cover and bodyside liner, provide continuous adjustment and fit without requiring complex manufacturing processes.
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 improves the fit, comfort, and leakage containment of the absorbent article while reducing manufacturing complexity and costs, as the extensible chassis can stretch more effectively around the wearer without compromising the absorbent core's performance.
Implementation Method 1
an absorbent core having a front edge, a back edge, and a surface area which is less than about 50% of the surface area of the article
Implementation Method 2
Absorbent articles may be otherwise elasticized in order to provide enhanced stretchability of the article chassis
Implementation Method 3
At least one of the liner and the outer cover is stretchable in at least one direction
Implementation Method 4
the extensible chassis can stretch more effectively around the wearer
Implementation Method 5
The absorbent core is disposed between the liner and the outer cover and bonded to at least one of the liner and the outer cover thereby inhibiting the stretchability of the liner or the outer cover
Data Source
AI summary
A disposable absorbent article has an absorbent core having a surface area and a stretchable multilayer chassis having a surface area. The multilayer chassis is stretchable in at least the cross-machine direction. The stretchable multilayer chassis has at least a stretchable bodyside liner and stretchable outer cover such that the absorbent core is affixed to at least one layer of the stretchable multilayer chassis. The percentage ratio of the surface area of the absorbent core to the surface area of the stretchable multilayer chassis is less than about 50%.