Diaper Fluid Isolation Layer for Leakage Prevention
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Solution Overview
Problem
Existing reusable protective undergarments, such as diapers with reusable absorbent pads, face issues with fluid leakage due to stitching and leg openings, and require a snug fit for different sizes, which can cause discomfort.
Innovation Solution
A diaper design featuring a fluid isolation layer between the outer and inner layers forming a pocket with a slot, where the fluid isolation layer is stitched to the inner layer to create a hidden central core pocket, reducing leakage by acting as the primary fluid barrier and allowing adjustable fasteners to fit various sizes without compromising comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer layer is made as the primary fluid barrier to prevent leakage, then leakage prevention is improved, but the leg openings must fit tightly which causes discomfort
Solution Approach 1:
The fluid barrier function is segmented from the outer layer and assigned to a dedicated fluid isolation layer. This layer is positioned between the outer layer and inner layer, creating a separate containment system that does not rely on tight leg opening fit. The segmentation allows the leg openings to be more comfortable while the isolated fluid barrier maintains leakage prevention.
Solution Approach 2:
A fluid isolation layer is introduced as an intermediary element between the outer and inner layers. This intermediate layer acts as the primary fluid barrier, eliminating the need for the outer layer to be the sole means of preventing leakage. The intermediary layer allows the leg openings to fit more comfortably while maintaining reliable fluid containment.
2Adaptability or versatility
If adjustable fasteners are used to fit different sizes, then adaptability is improved, but discomfort increases due to fastener contact with wearer
Solution Approach 1:
The absorbent pad is nested within a pocket formed by the fluid isolation layer and inner layer. This nesting arrangement positions the absorbent pad between the adjustment fasteners and the wearer, creating a buffer that prevents fastener contact with the wearer's skin. The nested structure allows size adjustment while maintaining comfort.
Solution Approach 2:
The pocket structure creates a third dimension (depth) between the fasteners and the wearer. By extending the pocket beyond the rows of adjustment fasteners, the design uses spatial separation in the depth dimension to prevent discomfort while maintaining size adjustability through fastener engagement.
3Strength
If stitching is used to attach the sleeve to the outer layer, then structural integrity is improved, but fluid leakage occurs through the stitches
Solution Approach 1:
The fluid isolation layer serves as an intermediary fluid barrier that is independent of the stitching structure. By positioning this layer between the outer and inner layers and joining it to the inner layer to form a pocket, the design creates a fluid containment system that does not rely on stitches, thereby preventing leakage through stitching points.
Data Source
AI summary
An undergarment, such as a diaper, includes a hidden central core pocket for receipt of an absorbent pad. The pocket is formed between an inner, fluid permeable layer and a fluid isolation layer. The fluid isolation layer is attached to the inner or anchor layer and is located between the inner layer and an outer layer to which the inner layer is attached. The pocket is narrower than the outer to isolate fluids from edges of the outer layer and from diaper leg openings. Both the fluid isolation layer and the outer layer may be fluid resistant to provide additional protection against leakage. Adjustment fasteners on the outside of the outer shell permit size adjustment for the diaper and the adjustment fasteners are positioned within the periphery of the pocket so that presence of the absorbent pad will enhance comfort.