Disposable Diaper Fastening Tape Notch for Leg-Side Flap Deformation
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Solution Overview
Problem
Conventional disposable diapers suffer from reduced fit around the legs due to weakened forces acting on the side flaps when the backside and abdominal side portions are fastened, either because the fixed portion of the fastening tape does not extend below the protruding piece or because its extension increases rigidity, leading to improper deformation of the side flaps.
Innovation Solution
The disposable diaper design includes a fastening tape with a fixed portion that has a notch recessed inward from its outer edge, located closer to the leg side, and a protruding piece, along with a non-fixed region and a fragile structure to allow for deformation, enhancing the fit around the legs by generating wrinkles and improving flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fixed portion does not extend below the protruding piece, then the fastening structure is simpler, but the fit around the legs is weakened
Solution Approach 1:
The fixed portion is designed with a notch in its lower region, creating a localized structural feature that allows the side flap to deform properly around the leg while maintaining adequate fastening strength. This local modification addresses the fit issue without requiring extensive changes to the overall fastening structure.
2Strength
If the fixed portion extends below the protruding piece, then the rigidity of the lower side flap is increased, but the side flap cannot deform properly, reducing the fit around the legs
Solution Approach 1:
A notch is introduced in the lower region of the fixed portion to create a localized area of reduced rigidity. This allows the side flap to deform properly around the leg while other portions maintain necessary strength.
Solution Approach 2:
The fixed portion is segmented by the notch, dividing it into upper and lower regions with different rigidity characteristics. The upper region maintains strength while the lower region allows deformation for proper fit.
3Reliability
If a notch is added to the fixed portion, then the fit around the legs is improved through proper deformation, but the manufacturing complexity increases
Solution Approach 1:
The notch is a simple localized feature that can be easily incorporated into the fastening tape manufacturing process using standard cutting or punching techniques, minimizing the increase in manufacturing complexity while achieving the desired fit improvement.
Data Source
AI summary
A disposable diaper includes a diaper body having a top sheet, a back sheet, and an absorber disposed therebetween, the disposable diaper extending from a backside portion to an abdominal side portion; a side flap provided in each of side portions of the backside portion, the side flap extending outward beyond the absorber in a width direction; and a fastening tape that is provided in the side flap to be fastened to the abdominal side portion when the diaper body is used. The fastening tape includes a fixed portion fixed to the side flap, and a protruding piece extending outward from the fixed portion in the width direction. The fixed portion includes a notch in a lower region that is closer to a leg side of a wearer than the protruding piece. The notch is recessed from an outer edge in the width direction toward an inner side.