Absorbent Article Rear Side Flap Shear Rigidity Support
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Solution Overview
Problem
Conventional sanitary napkins with rear side flaps tend to bunch or deform due to friction with undergarments, leading to discomfort and potential leakage, as they fail to conform properly to the body throughout use.
Innovation Solution
An absorbent article design featuring a continuous support layer with a shear rigidity value of at least 3.0 gf/cm·degree in the longitudinal direction, combined with a uniform adhesive layer, to prevent rear side flaps from bunching and ensure better fit and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rear side flaps are added to conventional sanitary napkins, then the fit and comfort are improved, but the flaps tend to bunch or deform due to friction with undergarments during use
Solution Approach 1:
The patent applies parameter changes by introducing a continuous support layer with specific shear rigidity (at least 3.0 gf/cm·degree) to modify the mechanical properties of the rear side flaps. This rigidity parameter prevents the flaps from bunching or deforming under friction while maintaining their conforming ability to the body, thus resolving the contradiction between fit and structural stability.
Solution Approach 2:
The patent uses composite materials by combining the continuous support layer with the absorbent core and backsheet. The support layer is integrated into the rear end region to provide structural reinforcement specifically where needed, preventing flap deformation while preserving the overall comfort and fit characteristics.
2Reliability
If increased product length and thickness are used, then protection from soiling is improved, but the product fails to conform to the body properly during entire usage period
Solution Approach 1:
The patent applies local quality by placing the continuous support layer specifically in the rear end region where the rear side flaps are located. This localized reinforcement provides the necessary structural integrity to prevent bunching while allowing the rest of the napkin to maintain its conforming ability to the body contours throughout the usage period.
Solution Approach 2:
By controlling the shear rigidity parameter of the continuous support layer to be at least 3.0 gf/cm·degree, the patent achieves optimal balance between protection and conformance. This specific parameter range ensures the flaps remain stable enough to prevent leakage but flexible enough to adapt to body movements.
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 solution effectively prevents rear side flaps from bunching, maintaining comfort and ensuring the sanitary napkin remains in the correct position, reducing the risk of leakage and enhancing overall fit and usability.
Implementation Method 1
The continuous support layer includes a continuous material which has a shear rigidity value of at least 3.0 gf/cm·degree in the longitudinal direction
Implementation Method 2
a uniform adhesive layer disposed between the continuous support layer and the backsheet in the rear end region, wherein the uniform adhesive layer uniformly bonds the continuous support layer to the backsheet in the rear end region
Data Source
AI summary
An absorbent article having a pair of longitudinal edges, front and rear transverse edges, a front end region, a rear end region, and a central region disposed between the front and rear end regions. The ratio of the width of the rear end region to the width of the front end region ranges between 1:1 and 2.5:1. The absorbent article has a topsheet, backsheet, and an absorbent core disposed between the topsheet and the backsheet. The absorbent core has a pair of longitudinal edges and a pair of rear side flaps each extending laterally from the corresponding longitudinal edge of the absorbent core in the rear end region and a continuous support layer disposed on the backsheet in the rear end region. The continuous support layer includes a continuous material having a shear rigidity value of at least 3.0 gf/cm·degree in the longitudinal direction.