Disposable Diaper Leg Stretch Units for Shifting Prevention
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Solution Overview
Problem
Disposable diapers for infants and toddlers tend to shift downward when the wearer assumes a sitting posture due to the synergistic effect of their body type, with increased load on the front waistline region, where the fastening tapes are stiffer than other parts, causing the diaper to move.
Innovation Solution
A disposable diaper design featuring a front waistline region, a rear waistline region, and leg stretch units that are expansible and contractible, with the leg stretch units having a curved shape to distribute the load and prevent shifting, including a pair of leg openings that are concave inwardly and a pair of leg stretch units that extend from the crotch region outwardly, with a separation distance between them that varies to accommodate body movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fastening tapes are made stiffer to maintain structural integrity, then the fastening function is improved, but the diaper is more likely to shift downward when the wearer bends
Solution Approach 1:
The patent applies local quality by making the fastening tapes have different stiffness characteristics at different locations. The base ends of the fastening tapes are made stiffer to maintain structural integrity and fastening function, while the front ends are made more flexible to adapt to body movements and prevent downward shifting. This gradient stiffness design resolves the contradiction between maintaining fastening strength and preventing diaper displacement.
2Adaptability or versatility
If the diaper structure is made more flexible to accommodate body movement, then comfort is improved, but the fastening function deteriorates
Solution Approach 1:
The fastening tapes are designed with local quality variations where the base ends have higher stiffness to maintain fastening strength, while the front ends have lower stiffness to accommodate body movements. This localized differentiation allows the diaper to simultaneously maintain fastening function and adaptability to body movements.
3Strength
If the front waistline region is made stiffer to support the abdomen, then structural support is improved, but the diaper shifts downward more easily
Solution Approach 1:
The front waistline region incorporates fastening tapes with gradient stiffness where the base ends provide structural support while the front ends remain flexible. This local quality differentiation allows the front waistline to provide necessary abdominal support while preventing downward shifting through the flexible front portions of the fastening tapes.
Data Source
AI summary
A disposable diaper (10) includes a pair of leg stretch units (75) extending along the leg opening (35) and can expand and contract in the product longitudinal direction.A separation distance (D2) between the ends the leg stretch units (75) in the rear waistline region 30 is longer than the separation distance (D1) between the ends of the leg stretch units (75) in the front waistline region (20). The leg stretch units extending from the crotch region towards the rear waistline region are convex outwardly in the product widthwise direction. The leg stretch units extending from the crotch region towards the front waistline region are convex towards an inner side in the product widthwise direction.