Absorbent Garment Droop Elimination via Dimensional Ratios
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Solution Overview
Problem
Absorbent garments, such as diapers, tend to droop or sag due to factors like excessive crotch width, insufficient waist elastic retraction force, and improper dimension proportions, leading to discomfort and increased material usage.
Innovation Solution
Designing absorbent garments with optimized dimensions, including a shorter longitudinal length, narrower crotch region, and sufficient waist elastic retraction force, to reduce drooping while maintaining absorbency and comfort, thereby minimizing material usage and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the crotch region width is increased to provide storage area for bodily wastes, then absorbency is improved, but droopiness in the crotch region worsens
Solution Approach 1:
The absorbent core is positioned asymmetrically within the chassis, with greater absorbent material concentrated in the crotch region where bodily wastes are deposited. This local concentration provides high absorbency capacity while avoiding uniform distribution that would increase overall crotch width and cause drooping.
2Length of moving object
If the longitudinal length of the garment is increased to extend from above the navel through the crotch region and up the back, then coverage is improved, but drooping worsens when the garment is loaded
Solution Approach 1:
The garment design shifts from extending longitudinally upward along the back to extending laterally across the back waist region. The tabs extend transversely from the center back toward the sides, providing coverage in the transverse dimension rather than increasing longitudinal length, thereby preventing drooping while maintaining adequate coverage.
3Loss of substance
If as little material as possible is included in each absorbent garment, then manufacturing cost is reduced, but comfort and functionality worsen
Solution Approach 1:
The design optimizes the ratio of longitudinal length to transverse width, specifying that the ratio should be 0.85 or less. This parameter change ensures adequate coverage and functionality while minimizing excess material that would increase cost, achieving the right balance between material expenditure and comfort.
4Force
If the waist elastic retraction force is increased to prevent the garment from sliding down, then fit is improved, but the garment complexity worsens
Solution Approach 1:
The waist elastic is designed to provide sufficient retraction force to maintain the garment at the wearer's waistline, with the longitudinal length optimized to work in conjunction with the elastic force. This parameter optimization achieves adequate fit without requiring additional complex elastic mechanisms or structural modifications.
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 optimized design effectively reduces or eliminates drooping in the crotch region, maintains leg/hip fit under extreme loads, and achieves cost savings without compromising absorbency or leak resistance.
Implementation Method 1
If the waist elastic has insufficient retraction force, the garment may slide down the wearer's torso
Data Source
AI summary
An absorbent garment, such as a diaper, designed to reduce or eliminate any tendency of the garment to droop when loaded. The absorbent garment includes an absorbent chassis that defines a waist opening and two leg openings. Based on dimensions of the garment, the absorbent chassis suitably has a diaper length ratio of about 0.85 or less, a droop design ratio of about 150 millimeters or less, and/or an absorbent length design ratio of about 280 millimeters or less.