Absorbent Core Density Zoning for Fit and Material Efficiency
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Solution Overview
Problem
There is a need for disposable absorbent articles that provide improved fit and body conformance, absorbency, and leakage security while minimizing material consumption and manufacturing costs, with a focus on tailoring absorbent material distribution based on user anatomy.
Innovation Solution
The absorbent article features an absorbent core with alternating oblong high density and low density areas, where the high density areas concentrate absorbent material for absorption and rigidity, and low density areas provide flexibility and body conformity, enclosed by a core cover with sealed channels to maintain structure and distribution efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform density absorbent material is used throughout the core, then absorbency is improved, but material consumption and cost increase
Solution Approach 1:
The absorbent core is designed with varying density distribution, where high density areas are positioned in the crotch portion to provide enhanced absorbency where fluids are most likely to occur, while low density areas are positioned in the waist portions to reduce material consumption. This local differentiation of material properties optimizes both absorbency performance and material efficiency.
2Reliability
If high density absorbent material is used throughout the core, then absorbency is improved, but flexibility and body conformity deteriorate
Solution Approach 1:
The core structure implements local quality differentiation by positioning high density absorbent material specifically in the crotch portion where rigidity and absorbency are needed, while using low density material in the waist portions that require flexibility and body conformity. This spatial differentiation resolves the contradiction between absorbency and adaptability.
Solution Approach 2:
The absorbent core is segmented into distinct high density and low density areas, allowing each segment to perform its specific function independently. The high density segments provide absorbency and structural support in the crotch, while low density segments provide flexibility in the waist areas, achieving both requirements simultaneously.
3Quantity of substance
If low density absorbent material is used throughout the core, then material consumption is reduced, but absorbency and leakage security deteriorate
Solution Approach 1:
The design applies local quality by concentrating low density material in the waist portions where absorbency requirements are lower, while maintaining high density material in the crotch portion where maximum absorbency is critical. This targeted approach reduces overall material consumption while preserving essential absorbency performance.
4Adaptability or versatility
If low density absorbent material is used throughout the core, then flexibility is improved, but absorbency and leakage security deteriorate
Solution Approach 1:
The core structure uses local quality differentiation to provide low density material in waist portions for flexibility and body conformity, while maintaining high density material in the crotch portion for adequate absorbency and leakage security. This spatial differentiation allows both flexibility and absorbency to be optimized in their respective locations.
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 enhances fit, comfort, and absorption capacity by efficiently distributing fluids and reducing material usage, while minimizing leakage and providing a snug fit, even under wet conditions.
Implementation Method 1
an absorbent core which is sandwiched between a liquid-permeable topsheet and a liquid-impermeable backsheet
Implementation Method 2
The absorbent core comprises an absorbent component which is enclosed by a core cover, the absorbent component comprising a coherent area
Implementation Method 3
efficiently distributing fluids
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2F
AI summary
An absorbent article comprising an absorbent core sandwiched between a liquid- permeable topsheet and a liquid-impermeable backsheet. The absorbent article comprising a front portion, a back portion and a crotch portion located between the front portion and the back portion. The absorbent core comprises a coherent area being disposed in at least the front portion and the crotch portion of the absorbent article. The coherent area has a front edge and a back edge. The coherent area is comprised in an absorbent component enclosed by a core cover. The core cover comprises an upper side and a lower side and a sealing arrangement for joining said upper and lower sides of the core cover in the form of at least one sealed channel extending in the longitudinal direction of the absorbent core. The sealed channel is free or substantially free from absorbent material. The absorbent component comprises oblong high density areas of absorbent material alternating with oblong low density areas of absorbent material extending in the longitudinal direction of the absorbent article in the front portion and/or in the crotch portion.