Pull-on Diaper Waist Elastic Configuration for Infant Fit
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Solution Overview
Problem
Conventional pull-on diapers are not suitable for younger babies as they require waist tightening, which is not necessary for infants in a supine posture, and enlarging leg-openings to accommodate their M-shaped legs is challenging due to the inimical effect of increased elongation ratio of lower elastics.
Innovation Solution
A pull-on diaper design with waist elastics secured under tension to the front and rear waist panels, and first leg elastics to the crotch panel, with leg-openings defined by the cooperation of waist and crotch panel portions, ensuring a distance between waist elastics is at least 55% of the outer end portions' distance to allow easy leg insertion and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dimension of the leg-openings is enlarged to accommodate younger baby's M-shaped legs, then the ease of operation is improved, but the elongation ratio of the lower elastics must be increased which worsens the fit quality
Solution Approach 1:
The diaper is divided into separate front and rear waist panels with an overlapping configuration. The front waist panel has a front waist opening and the rear waist panel has a rear waist opening, creating distinct functional zones. This segmentation allows independent optimization of each panel's dimensions and elastic properties without compromising overall fit quality.
Solution Approach 2:
The diaper structure transitions from a conventional single-panel design to a multi-panel overlapping configuration. By adding the dimensional aspect of panel overlap and creating separate front/rear openings, the design provides additional degrees of freedom in accommodating leg positioning while maintaining elastic fit through the overlapping regions.
2Reliability
If waist tightening is implemented to prevent diaper slippage, then the reliability is improved, but the comfort is worsened for younger babies in supine posture
Solution Approach 1:
The diaper employs elastic panels that dynamically adapt to the baby's body shape and movements. The elastic properties allow the diaper to maintain stability through elastic recovery rather than constant tight compression, providing reliability without harmful pressure on the baby's waist area.
Solution Approach 2:
The design changes the key parameter from waist compression force to elastic panel tension. By using elastics with appropriate tension characteristics in the front and rear waist panels, the diaper achieves stability through elastic rebound rather than sustained pressure, reducing harmful effects on the baby's developing waist area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design allows for easy application and prevents leakage by increasing leg-opening extensibility and maintaining close contact with the baby's thighs, ensuring comfort and effective fluid containment.
Implementation Method 1
a plurality of waist elastics extending in the transverse direction are contractibly secured under tension to the front and rear waist panels, respectively
Implementation Method 2
first leg elastics are contractibly secured under tension to lateral portions of the crotch panel
Data Source
AI summary
In a pull-on diaper, a first distance dimension between outer end portions of front and rear waist panels is in a range of 300 mm to 400 mm as measured on the diaper flatly developed after coupling of the front and rear waist panels in seam regions has been released. A second distance dimension between the waist elastic closest to an inner end portion of the front waist panel among waist elastics extending in the front waist panel across the respective seam regions in the front waist panel and the waist elastic closest to an inner end portion of the rear waist panel among waist elastics extending in the rear waist panel across the respective seam regions is at least 55% of the first distance dimension between outer end portions of the front and rear waist panels.