Absorbent Core with Varied Basis Weight Distribution
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Solution Overview
Problem
Thin, flexible, and inexpensive absorbent articles face challenges in absorbing and holding multiple rushes of liquid without substantial leakage, due to limitations in absorbency rate and capacity of absorbent particulate polymer materials.
Innovation Solution
A disposable absorbent article design featuring an absorbent core with absorbent particulate polymer material that varies in basis weight across the core, either perpendicular or parallel to the longitudinal axis, deposited between a topsheet and backsheet, to enhance liquid absorption and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If absorbent particulate polymer material is used to make thin, flexible, and inexpensive absorbent articles, then the article becomes thinner and more flexible, but the ability to absorb and hold multiple rushes of liquid without leakage is reduced
Solution Approach 1:
The patent applies local quality by varying the basis weight of absorbent particulate polymer material across different zones of the absorbent core. High basis weight zones (greater than 20 gsm) are positioned in areas requiring high absorbency to handle liquid rushes, while low basis weight zones (less than 10 gsm) are placed in areas where flexibility and comfort are priorities. This zoned distribution allows the thin article to reliably absorb and hold multiple rushes of liquid without leakage while maintaining overall thinness and flexibility.
2Ease of manufacture
If uniform basis weight of absorbent particulate polymer material is used throughout the absorbent core, then manufacturing is simpler, but liquid absorption and retention performance during rushes is insufficient
Solution Approach 1:
The patent implements local quality through a varied basis weight distribution of absorbent particulate polymer material across the absorbent core. Different zones are assigned different basis weights (ranging from less than 10 gsm to greater than 20 gsm) to optimize liquid absorption and retention performance in specific areas during liquid rushes, while maintaining manufacturability through controlled deposition processes.
3Quantity of substance
If higher basis weight of absorbent particulate polymer material is used throughout the absorbent core, then liquid absorption capacity increases, but the article becomes bulkier and less flexible
Solution Approach 1:
The patent applies local quality by strategically distributing absorbent particulate polymer material with varied basis weights across different zones of the absorbent core. High basis weight zones (greater than 20 gsm) are concentrated in areas requiring maximum absorbency to handle liquid rushes, while low basis weight zones (less than 10 gsm) are placed in areas where flexibility and comfort are prioritized. This optimized distribution achieves high liquid absorption capacity without increasing overall article bulk.
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 varying basis weight distribution in the absorbent core effectively absorbs and holds liquid, reducing leakage by optimizing the absorbency and retention capabilities of the article during initial and subsequent liquid rushes.
Implementation Method 1
Absorbent particulate polymer material absorbs liquid and swells within the article
Data Source
AI summary
A disposable absorbent article comprising an absorbent core located in a chassis and comprising absorbent particulate polymer material having a basis weight that varies across the absorbent core. Methods for making such an absorbent core and corresponding disposable absorbent article are also disclosed.