Disposable Diaper Fastening Tape Gradient Rigidity Waistline Adaptation
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Solution Overview
Problem
Conventional disposable diapers face challenges in adjusting to the varying waistline shape of infants and toddlers due to breathing and eating, requiring significant effort for fastening adjustments and risking over-tightening or inability to follow complex body shapes.
Innovation Solution
A disposable diaper design featuring a fastening tape with a base sheet and hook sheet, where the engagement hooks have a density of over 708 pins per cm, an engagement strength of 0.3 N/30 mm to 1.5 N/30 mm, and a bending rigidity that favors 'outer bending' to accommodate the waistline shape without over-tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rigidity of the fastening tape is increased to firmly support the disposable diaper, then the position stability is improved, but the fastening tape cannot follow the complex shape of the waistline of the wearer
Solution Approach 1:
The fastening tape is designed with non-uniform rigidity distribution, where the proximal end has higher rigidity for stability and the tip has lower rigidity for adaptability. This local quality variation allows different parts of the same component to fulfill different functional requirements.
Solution Approach 2:
The rigidity parameter of the fastening tape is changed along its length, creating a gradient structure. The rigidity decreases from the proximal end to the tip, enabling the tape to transition from a stable support function to a flexible adaptation function.
2Adaptability or versatility
If the rigidity of the fastening tape is decreased to follow the waistline shape, then the adaptability to body shape is improved, but the fastening tape cannot firmly support the disposable diaper
Solution Approach 1:
Different sections of the fastening tape are assigned different rigidity levels to simultaneously achieve support and adaptability functions within the same component.
Solution Approach 2:
The fastening tape is functionally segmented into a proximal end region for support and a tip region for adaptation, with each segment optimized for its specific function through differential rigidity design.
3Ease of operation
If fine adjustments of the fastening tape position are made to avoid over-tightening, then the comfort is improved, but the time and effort required for adjustment is increased
Solution Approach 1:
The fastening tape's gradient rigidity structure enables it to automatically adapt to the waistline shape without requiring manual fine adjustments. The flexible tip naturally conforms to body contours, providing self-adjusting comfort.
Solution Approach 2:
The fastening tape transitions from a static, uniform rigidity design to a dynamic, gradient rigidity design that allows automatic adaptation to body shape changes during wear.
Data Source
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AI summary
A fastening tape (100) included in a disposable diaper (10) has a base sheet (120), and a hook sheet (110) provided with a plurality of engagement hooks (111) and fixed on the base sheet (120). The engagement strength of the fastening tape (100) is 0.3 N/30 mm or more, and 1.5 N/30 mm or less. The bending rigidity value in the direction in which the surface of the base sheet (120) of the fastening tape (100) comes towards itself is smaller than the bending rigidity value in the direction in which the surface of the hook sheet (110) of the fastening tape (100) comes towards itself.