Oriented Lyocell Core Cover for Diaper Wicking and Gel Blocking
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Solution Overview
Problem
Absorbent products like diapers face inefficiencies due to gel blocking by super absorbent polymers (SAP) and stiffness from airlaid sheets, which restrict SAP distribution and comfort, and existing core covers lack sufficient wicking and wet integrity, leading to leakage and discomfort.
Innovation Solution
A non-woven functional core cover made with lyocell fibers oriented in the same direction, enhancing wicking properties and wet integrity, which reduces the amount of fluff needed and improves liquid distribution across the absorbent core, thereby reducing leakage risks and enhancing comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If more SAP is used to reduce weight and thickness, then weight and thickness are reduced, but gel blocking occurs and absorbency efficiency decreases
Solution Approach 1:
The patent introduces a wicking layer as an intermediary component between the liquid source and the SAP-containing absorbent core. This wicking layer actively transports liquid to the SAP, preventing gel blocking by ensuring continuous liquid supply to unsaturated SAP regions, thereby maintaining absorbency efficiency while allowing high SAP content for weight reduction.
Solution Approach 2:
The wicking layer performs preliminary action by proactively transporting liquid before the SAP can absorb it. This pre-positioning of liquid through the wicking network ensures that SAP granules receive liquid in a controlled manner, preventing the formation of gel blocks that would otherwise block liquid paths to remaining SAP.
2Ease of manufacture
If an airlaid sheet is used for the pulp core, then production is simplified, but the sheet feels stiff and does not provide optimum movement and comfort
Solution Approach 1:
The patent replaces the stiff airlaid sheet with a flexible wicking layer made of hydrophilic fibers. This thin film structure provides the necessary flexibility and movement comfort while maintaining the simplified production approach through non-woven fabric formation, resolving the contradiction between ease of manufacture and wearer comfort.
3Weight of stationary object
If lightweight core cover material is used, then weight is reduced, but protection and cushioning effect are insufficient and SAP granules may be felt or puncture the cover
Solution Approach 1:
The patent employs a composite core cover structure combining multiple fiber types and layers. The wicking layer uses a blend of hydrophilic fibers with different properties - some providing softness and lightness, others providing strength and cushioning. This composite approach allows the cover to remain lightweight while adequately protecting SAP granules and preventing them from being felt through the outer surface.
4Reliability
If traditional core covers are used, then SAP granules are contained, but wicking properties are insufficient leading to poor liquid distribution
Solution Approach 1:
The patent transforms the core cover from a passive containment structure into a multi-functional active component. The wicking layer simultaneously performs containment of SAP granules, active liquid transport through capillary action, and distribution of liquid across the absorbent core. This universal functionality improves liquid distribution without requiring additional separate components, thus not increasing overall device complexity.
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 functional core cover improves wicking and wet integrity, ensuring better liquid distribution and absorption, reducing the risk of leakage and enhancing the comfort and flexibility of absorbent products by allowing more efficient use of SAP and fluff pulp, while also being environmentally friendly by avoiding plastic-based polymers.
Implementation Method 1
the functional core cover comprises at least a first fraction comprising lyocell fibres, and characterised in that a majority of the fibres constituting the functional core cover are oriented in the same direction
Implementation Method 2
A non-woven functional core cover made with lyocell fibers oriented in the same direction, enhancing wicking properties and wet integrity
Data Source
Figure 1
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Figure 3a~3b
AI summary
A non-woven functional core cover for use in combination with an absorbent core, where said functional core cover comprises at least a first fraction comprising lyocell fibres, and characterised in that a majority of said fibres are oriented in the same direction. Thus, the absorbent core cover may be considered an absorbent article component. Thereby, a functional core cover having improved wicking properties and improved wet integrity is realised, the advantages allowing reducing the amount of fluff used in the mix with SAP. A reduction of material used in the absorbent core improves the feeling of wearing the absorbent product, e.g. a baby diaper, which in turn facilitate the movement of the baby. The wicking properties cause liquid to be distributed better across the surface of the core cover, such that more of the absorbent core is exposed to the expelled liquid.