Wavy Wing Edge Angles for Diaper Thigh Fit
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Solution Overview
Problem
Conventional tape-type disposable diapers experience discomfort and potential leakage when the wearer bends their thigh, as the upper front surface of the thigh often comes into contact with the lower edges of the wing parts, particularly due to inadequate fitting and design that fails to accommodate varying body sizes and bending angles.
Innovation Solution
The tape-type disposable diaper features a ventral part with obliquely extending wing parts having wavy lower edges, a crotch portion with side edges that extend at a specific angle, and a side elastic member that allows for contraction and expansion, ensuring a better fit and reduced friction by adjusting to the body's shape and movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the wing parts are designed with straight lower edges to simplify manufacturing, then the manufacturing process is easier, but the fitting comfort when the wearer bends the thigh deteriorates
Solution Approach 1:
The lower edge of the wing part is designed with a curved shape instead of a straight line. Specifically, the lower edge extends from the side edge of the crotch portion toward the front side with a curvature radius of 10mm to 50mm, allowing the wing part to conform to the curved surface of the thigh when bent, thereby improving fitting comfort while maintaining manufacturing feasibility
Solution Approach 2:
The wing part is designed to be detachable and repositionable, allowing it to adapt dynamically to different thigh bending angles and body positions. The connecting tape enables the wing part to move from a lateral position to a front-position when the diaper is worn, optimizing the fit as the wearer's pose changes
2Adaptability or versatility
If the diaper is designed to accommodate a wide range of body sizes in one size, then the versatility is improved, but the fitting precision when the wearer bends thighs deteriorates
Solution Approach 1:
The diaper provides adjustable parameters through the connecting tape system, which can be attached at different positions on the ventral part. This allows the same diaper to be customized for different body sizes and thigh bending angles, maintaining both versatility and fitting precision by enabling parameter adjustment after manufacturing
Solution Approach 2:
The diaper is divided into separable components including the wing part and connecting tape that can be independently positioned. This segmentation allows each component to be optimized for its specific function while working together to accommodate various body sizes and bending degrees through adjustable configuration
3Reliability
If the lower edge of the wing part is positioned to cover more area for better leakage protection, then the reliability is improved, but the friction and discomfort when the thigh bends deteriorates
Solution Approach 1:
The curved lower edge design allows the wing part to cover a larger effective area by following the natural curvature of the thigh, providing leakage protection while reducing friction. The curvature radius of 10mm to 50mm enables the material to conform to the thigh surface rather than creating sharp contact points that cause discomfort
Solution Approach 2:
The wing part is designed as a flexible component that can deform and adapt to the thigh's shape during bending. This flexibility allows it to maintain leakage protection by staying in contact with the thigh surface while accommodating movement without creating excessive friction or discomfort
Data Source
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AI summary
To improve the fitting of the lower edge of wing parts when the wearer bends the thighs. Lower edges 70 of wing parts WP of a ventral part F has a first part 71 on a base edge side and a second part 72 on a tip end side. The first part 71 and the second part 72 are wavy portions 80 having a plurality of valleys recessed inward. In the wavy portion 80 of the first part 71, the obtuse side intersection angle θ1 between a tangent D1 contacting both of adjacent valleys 83 and a front-back direction LD is 160 to 175 degrees. In the wavy portion 80 of the second part 72, an obtuse side intersection angle θ2 between a tangent D2 contacting both of the adjacent valleys 83 and the front-back direction LD is 120 to 150 degrees. The dimension 71y of the first part 71 in the front-back direction LD is 0.15 to 0.30 times the dimension My of the crotch portion M in the front-back direction LD, and the dimension 72y of the second part 72 in the front-back direction LD is 0.10 to 0.25 times the dimension My of the crotch portion M in the front-back direction LD.