Absorbent Product Segmented Core Delamination Design
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Solution Overview
Problem
Existing absorbent products face challenges in improving liquid diffusion properties and suppressing fluid return, as air gaps between the fiber assembly layer and sealed parts are not always sufficient.
Innovation Solution
An absorbent product design featuring a liquid-pervious top sheet, a water-repellent or liquid-impervious back sheet, and an absorbent core with a super absorbent material fixedly attached between sheets, including material existence and non-existence regions with specific joining configurations to enhance liquid diffusion and prevent fluid return.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air gaps are formed between the fiber assembly layer and sealed parts to improve liquid diffusion, then liquid diffusion properties are improved, but fluid return suppression becomes insufficient
Solution Approach 1:
The absorbent core is divided into multiple regions: first joined portions where sheets are fully bonded, second joined portions with partial bonding, and third joined portions with different bonding characteristics. This segmentation creates controlled delamination spaces that improve liquid diffusion while maintaining fluid return suppression through the distributed joined portions.
Solution Approach 2:
Different joined portions are assigned different bonding qualities and characteristics. The first joined portions provide strong bonding for structural integrity, while the second and third joined portions create controlled spaces for liquid diffusion. This local differentiation allows simultaneous optimization of both liquid diffusion and fluid return suppression.
2Strength
If the top sheet and upper absorber sheet are joined together to form sealed parts, then structural integrity is improved, but liquid diffusion properties deteriorate
Solution Approach 1:
The joining between top sheet and upper absorber sheet is segmented into different regions: first joined portions with full bonding for structural support, and second joined portions with partial bonding that create delamination spaces. This segmentation allows the structure to maintain integrity while providing pathways for liquid diffusion.
Solution Approach 2:
The invention introduces a vertical dimension to liquid diffusion by creating delamination spaces between sheets. Instead of relying solely on horizontal diffusion through sealed parts, liquid can diffuse vertically through the layered structure, adding another dimension to the diffusion pathway.
3Quantity of substance
If super absorbent material is arranged in material existence regions, then absorption capacity is improved, but surface unevenness increases
Solution Approach 1:
The super absorbent material is segmented into discrete material existence regions separated by material non-existence regions. This segmentation allows the material to be distributed in controlled patterns that maintain absorption capacity while reducing surface unevenness through the intervening non-existence regions.
Solution Approach 2:
The material non-existence regions act as intermediaries between material existence regions. These regions provide spacing that prevents excessive surface unevenness while still allowing the super absorbent material in the existence regions to maintain high absorption capacity.
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 design improves liquid diffusion properties and suppresses fluid return by creating delamination spaces between the top sheet and the upper absorber sheet, allowing for wider absorption and retention of moisture without surface recessions, thus enhancing comfort and absorption efficiency.
Implementation Method 1
when the absorbent resin absorbs body fluids and swells, air gaps are formed between the fiber assembly layer and the sealed parts. This allows the body fluids seeping out through the fiber assembly layer to be diffused through the air gaps, and accordingly prevents the return of the body fluids (fluid return)
Implementation Method 2
The top sheet and the upper absorber sheet are partly joined together to form a second joined portion... creating delamination spaces between the top sheet and the upper absorber sheet
Implementation Method 3
When the absorbent polymer absorbs urine, the regions provided with the absorbent polymer increase in thickness and the surface of the absorber becomes uneven. This produces a space between the absorber and a top sheet, resulting in an improvement in air permeability.
Data Source
AI summary
In an absorbent product, an absorbent core includes an upper absorber including a super absorbent material fixedly attached between upper and lower absorber sheets. The upper absorber includes material existence regions that are arranged in the width direction and to which the super absorbent material is fixedly attached, and a material non-existence region in which the super absorbent material does not exist is arranged between each pair of adjacent material existence regions. In each material non-existence region, the upper and lower absorber sheets are entirely joined together. In at least one material non-existence region, the top sheet and the upper absorber sheet are partly joined together. The load applied when the nonwoven fabric of the top sheet is stretched 3% in the width direction is twice or more of the load applied when the nonwoven fabric of the upper absorber sheet is stretched 3% in the width direction.