Absorbent Core With Edge Portions For Reduced Material Usage
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Solution Overview
Problem
There is a need for an improved thin, flexible, and lightweight absorbent structure for disposable personal care articles that maintains effective fluid absorption, distribution, and retention while reducing manufacturing costs, energy consumption, and raw material usage, while also ensuring discreetness and sustainability.
Innovation Solution
The absorbent article features a top core sheet and a back core sheet with edge portions that do not fully cover the absorbent material, creating attachment zones that facilitate liquid distribution and absorption, thereby reducing material usage and manufacturing costs while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the amount of cellulose fibre or support material within and surrounding the absorbent structure is reduced, then the absorbent article becomes thinner, lighter, and less bulky, but the structural integrity and functional performance (coherence, absorption, distribution, and retention) deteriorate
Solution Approach 1:
The core sheets are designed with differentiated zones: attachment portions that bond to the backsheet provide structural anchoring, while edge portions extend beyond the absorbent material to provide reinforcement and define boundaries. This local differentiation allows reduced overall material usage while maintaining critical structural functions in specific areas.
Solution Approach 2:
The core sheets are segmented into distinct functional portions: attachment portions for bonding to the backsheet, edge portions for reinforcement and boundary definition, and intermediate portions for structural connection. This segmentation allows each portion to be optimized for its specific function, enabling reduced material usage overall while maintaining necessary structural integrity through strategically placed material in critical zones.
2Quantity of substance
If larger amounts of absorbent polymer material are used to replace fibrous substances, then the absorbent article achieves better liquid storage capacity, but the proportion of hydrophilic cellulose fibres decreases, affecting liquid absorption and distribution performance
Solution Approach 1:
The absorbent core is designed with localized zones of different material composition and density. The attachment portions and edge portions provide structural framework with lower absorbent material content, while the intermediate zones contain higher concentrations of absorbent polymer materials. This spatial differentiation allows optimized liquid handling performance while reducing overall material usage.
Solution Approach 2:
The absorbent core combines multiple materials with complementary properties: cellulose fibres provide hydrophilicity and liquid wicking, while absorbent polymer materials provide bulk storage capacity. The core sheets themselves form a composite structure of bonded web materials providing structural integrity. This multi-material composite approach enables both rapid liquid absorption/distribution and high storage capacity.
3Adaptability or versatility
If the absorbent material is not sufficiently immobilized, then manufacturing flexibility is improved, but functional performance characteristics (coherence, absorption, distribution, and retention) are lost, resulting in leakages and high rewet values
Solution Approach 1:
The core sheets are pre-formed with specific geometric configurations including attachment portions and edge portions before being assembled with the absorbent material. This preliminary structuring provides a built-in framework that guides and constrains the absorbent material into the desired configuration, ensuring proper immobilization and functional performance while maintaining manufacturing efficiency through modular assembly.
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 achieves reduced manufacturing costs, improved liquid distribution, and absorption capacities while minimizing material usage and energy consumption, resulting in a thinner, lighter, and more sustainable absorbent structure.
Implementation Method 1
The absorbent structure in between is normally made from a mixture of cellulose fibers or other fibrous substance and an absorbent polymer material
Implementation Method 2
The at least one attachment portion forms at least one attachment zone capable of creating a channel for liquid distribution and absorption upon wetting
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
An absorbent article comprising a liquid pervious topsheet, a liquid impervious backsheet, and an absorbent core positioned between the liquid pervious topsheet and the liquid impervious backsheet; said absorbent article having a first and second longitudinal edge and a first and second transverse edge; wherein the absorbent core comprises a top core sheet, a back core sheet, and absorbent material arranged partially between the top core sheet and the back core sheet; wherein at least one of the top core sheet and the back core sheet comprises at least one attachment portion which is attached to the other one of the top core sheet and the back core sheet forming at least one attachment zone, and at least one edge portion having at least one free edge and covering a portion of the absorbent material.