Shaped Sheet Protrusions for Absorbent Article Leakage Prevention
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Solution Overview
Problem
Existing absorbent articles face challenges in effectively preventing the spread and leakage of excreted liquids and semi-solids, such as urine and feces, due to inadequate surface configurations that fail to provide both leakage prevention and comfortable skin contact.
Innovation Solution
A shaped sheet with protrusions and connecting portions is designed for absorbent articles, featuring a staggered arrangement of protrusions connected by barrier-like connecting portions, which create a three-dimensional convexo-concave surface that prevents liquid spread and enhances absorption, while maintaining a dry and comfortable skin feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protrusions are formed with high fiber density at tip portions, then leakage prevention is improved, but skin comfort deteriorates due to hard and rough surface
Solution Approach 1:
The invention applies different fiber densities to different regions of the protrusions: the tip portions have high fiber density for leakage prevention, while the base portions have low fiber density for skin comfort. This spatial variation in material properties resolves the contradiction between hardness and comfort.
Solution Approach 2:
The protrusions are designed with a convex curved surface instead of sharp or flat surfaces. This curvature allows the tip portions to effectively block liquid while distributing contact pressure, reducing the harshness that would otherwise result from high fiber density alone.
2Shape
If protrusions are formed through contraction of lower layer, then three-dimensional shape is achieved, but fiber density becomes uniform reducing effectiveness
Solution Approach 1:
The invention creates non-uniform fiber density within the protrusions by having the tip portions formed from the upper layer (high density) and base portions formed from the lower layer (low density). This local differentiation maintains the three-dimensional shape while achieving the desired leakage prevention effectiveness.
Solution Approach 2:
The protrusions are constructed as composite structures combining fibers from two different non-woven layers with different fiber densities. This composite approach allows simultaneous achievement of three-dimensional shape and differentiated density zones for optimal performance.
3Ease of manufacture
If connecting portions are not provided, then manufacturing is simpler, but liquid spread between protrusions occurs
Solution Approach 1:
The surface structure is segmented into discrete protrusions connected by connecting portions. This segmentation allows each protrusion to independently prevent liquid spread in its region while the connecting portions provide continuous barrier coverage, achieving comprehensive protection without requiring a completely continuous structure.
Solution Approach 2:
The connecting portions act as intermediary elements between the protrusions, providing a barrier function in the spaces between protrusions. These intermediaries prevent liquid from spreading through the gaps while maintaining the segmented protrusion structure.
Data Source
AI summary
A shaped sheet, comprising: a plurality of protrusions (3) on one surface side of the shaped sheet formed of fibers; and connecting portions (5) for being barriers and connecting the protrusions (3) to one another, wherein the connecting portion (5) has a fiber density higher than a fiber density of the protrusion (3).