Profiled Absorbent Core with Varying Basis Weights
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Solution Overview
Problem
Profiled absorbent core structures with reduced cellulose fiber content may not provide satisfactory acquisition speed, necessitating an improvement in fluid handling performance for disposable absorbent articles.
Innovation Solution
The absorbent core is designed with a substrate layer and an absorbent layer immobilized by thermoplastic adhesive material, featuring varying basis weights of absorbent material and adhesive in different segments to optimize absorption speed and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If cellulose fiber content is reduced to make the absorbent core thinner, then the article thickness is reduced, but the acquisition speed deteriorates
Solution Approach 1:
The patent applies local quality by creating a profiled absorbent core with varying basis weights in different longitudinal segments. The front segment has a first basis weight, the middle segment has a second basis weight greater than the first, and the rear segment has a third basis weight greater than the first. This non-uniform distribution optimizes fluid acquisition speed in different regions while maintaining overall thinness, as each segment's absorbency is tailored to its specific functional requirements rather than using a uniform thin structure throughout.
Solution Approach 2:
The patent employs parameter changes by varying the basis weight parameter across different longitudinal segments of the absorbent core. By changing the absorbent material content from segment to segment (first basis weight in front, second greater basis weight in middle, third greater basis weight in rear), the patent achieves different acquisition speeds and absorption capacities in different regions, resolving the contradiction between overall thinness and localized acquisition speed requirements.
2Stability of the object's composition
If thermoplastic adhesive material is added to maintain mechanical stability with reduced cellulose fiber, then structural stability is improved, but acquisition speed deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the functional requirements of different longitudinal segments. The front segment, which requires high acquisition speed, has a lower basis weight and presumably lower adhesive content. The middle and rear segments, which prioritize containment and structural stability, have greater basis weights and presumably higher adhesive content. This localized differentiation allows the structure to achieve both rapid fluid uptake where needed and mechanical stability where required, without the adhesive uniformly compromising acquisition speed across the entire core.
3Ease of manufacture
If uniform basis weight is used throughout the absorbent core, then manufacturing simplicity is maintained, but fluid handling performance deteriorates
Solution Approach 1:
The patent applies local quality by creating a profiled structure with distinct longitudinal segments having different basis weights. The front segment has a first basis weight optimized for rapid fluid acquisition, while the middle and rear segments have greater second and third basis weights optimized for fluid containment and distribution. This differentiated approach significantly improves fluid handling performance compared to a uniform structure, while the segmentation follows a systematic pattern that can be implemented through conventional manufacturing techniques.
Solution Approach 2:
The patent employs segmentation by dividing the absorbent core into distinct longitudinal segments (front, middle, rear) with different basis weights. This segmentation allows each region to be optimized for its specific function - the front segment for rapid acquisition and the middle/rear segments for containment - thereby improving overall fluid handling performance while maintaining a structured approach that facilitates manufacturing through zoned material application.
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 configuration enhances acquisition speed and fluid handling performance by modulating the thermoplastic adhesive material distribution, ensuring efficient immobilization and absorption of fluids across the absorbent core.
Implementation Method 1
an absorbent layer, said absorbent layer comprising an absorbent material supported by, and immobilized on said substrate layer by a thermoplastic adhesive material
Implementation Method 2
The absorbent polymer material ensures that large amounts of bodily fluids, e.g. urine, can be absorbed by the absorbent article during its use
Implementation Method 3
The absorbent core structure is typically profiled, i.e. provided with regions of different capacity
Data Source
AI summary
An absorbent core for disposable absorbent articles comprising absorbent material having a basis weight that varies across the absorbent core is provided.