Absorbent Laminate With Elastic Intermediate Layers
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Solution Overview
Problem
Existing absorbent laminates face challenges in maintaining integrity and flexibility during liquid absorption, particularly when using superabsorbent polymers, as they experience significant volume expansion without adequate containment by the surrounding carrier material, leading to potential laminate breakdown.
Innovation Solution
A laminate structure featuring elastic intermediate layers made of flat material webs with individual threads or strands, allowing for cross-machine direction extensibility and gathering, which encapsulates superabsorbent sections to accommodate volume expansion both perpendicular and within the production plane, ensuring the laminate remains elastic and adaptable to body contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If superabsorbent polymers are used to replace cellulose for absorption, then absorption capacity is improved, but volume expansion causes laminate integrity to deteriorate
Solution Approach 1:
The patent employs elastic intermediate layers made of flexible film materials that can stretch and expand to accommodate the volume increase of superabsorbent polymers during liquid absorption. These flexible layers maintain laminate integrity by elastically deforming rather than breaking, solving the contradiction between high absorption capacity and structural stability.
Solution Approach 2:
The patent utilizes materials with different elastic moduli for the intermediate layers, allowing the laminate structure to adapt its mechanical properties. The elastic layers have parameters selected to permit controlled expansion while maintaining overall structural integrity, enabling the system to handle volume changes without compromising laminate stability.
2Adaptability or versatility
If elastic intermediate layers are used to accommodate volume expansion, then laminate flexibility is improved, but production complexity increases
Solution Approach 1:
The laminate is divided into distinct functional layers with intermediate elastic layers positioned between outer layers. This segmentation allows each layer to perform its specific function independently while simplifying the overall production process, as each layer can be manufactured and then assembled in a controlled sequence.
Solution Approach 2:
The patent creates a composite laminate structure combining materials with different properties (cellulose, superabsorbent polymers, elastic films) in a systematic arrangement. This composite approach enables the laminate to achieve both flexibility and structural integrity while using standardized material components that can be produced through conventional manufacturing processes.
3Reliability
If multiple layers are used to contain superabsorbent sections, then containment integrity is improved, but material consumption increases
Solution Approach 1:
The patent uses thin elastic film layers as intermediate containment barriers that provide sufficient structural integrity to hold superabsorbent sections while consuming minimal material. These thin films are strategically positioned to provide containment only where needed, reducing overall material consumption while maintaining reliability.
Solution Approach 2:
The laminate structure applies containment features locally rather than uniformly across the entire structure. Intermediate elastic layers are positioned specifically at locations where superabsorbent sections require containment, allowing the design to achieve necessary reliability while minimizing material usage in areas where full containment is not required.
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 laminate achieves high production capacity with both area-elastic and volume-elastic properties, maintaining integrity and transport performance even when swollen, while optimizing liquid conduction and minimizing material usage, thus enhancing the performance of hygiene articles.
Implementation Method 1
the intermediate layers consisting of flat material webs with individual threads, strands or bands... which encapsulates superabsorbent sections to accommodate volume expansion both perpendicular and within the production plane
Implementation Method 2
superabsorbent polymers, as they experience significant volume expansion when absorbing liquid
Data Source
Figure 1
Figure 2a~2b
Figure 2c~2d
AI summary
The invention relates to a laminate and method for continuously producing a flexible, liquid-absorbent laminate having two outer material webs, of which at least one is formed from a textile material, between which are inserted at least two stretchable-elastic intermediate layers that are pre-stressed with respect to said layers and comprise threads or bands running in opposite directions to each other and at an angle to the production direction. The intermediate layers shorten and gather the web material substantially transversely to the production direction thereof when the intermediate layers are relieved of stress. Powdery or fiber-shaped inclusions, which have absorbent properties for liquids, such as urine, blood, water, or sweat, or resorbing properties, such as the release of medicinal substances, cosmetic ingredients, or the generation of heat/cold, are introduced into the free spaces of the elastic intermediate layer.