Disposable Diaper Leg Stretch Unit Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Disposable diapers tend to experience entanglement of elastic members with the wearer's body during movement, leading to increased likelihood of leakage from leg hole openings.
Innovation Solution
Incorporating a crotch stretch unit with a higher tensile modulus than leg stretch units, positioned within the absorber placement region, and configuring leg stretch units to extend closer to the waistline regions, reducing entanglement by maintaining a stable fit and preventing sagging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic members are arranged along the leg hole openings to prevent leakage, then leakage prevention is improved, but the likelihood of entanglement with the wearer's body increases
Solution Approach 1:
The diaper is divided into distinct functional regions: a crotch stretch unit with higher tensile modulus for longitudinal stability, and leg stretch units with lower tensile modulus for lateral flexibility. This segmentation allows each region to perform its specific function independently, preventing entanglement while maintaining leakage prevention.
Solution Approach 2:
Different regions of the diaper are assigned different tensile modulus values. The crotch stretch unit has a higher tensile modulus to resist longitudinal stretching and maintain position, while the leg stretch units have lower tensile modulus to allow lateral expansion and contraction without entangling. This local differentiation resolves the contradiction between stability and flexibility.
2Adaptability or versatility
If the diaper is made stretchable to fit the body, then comfort and fit are improved, but the elastic members become more prone to entanglement during movement
Solution Approach 1:
The patent changes the tensile modulus parameter across different regions of the diaper. By setting the crotch stretch unit with higher tensile modulus and leg stretch units with lower tensile modulus, the diaper achieves appropriate stretchability for body fit while preventing entanglement during movement. This parameter differentiation allows the diaper to adapt to body contours without causing harmful entanglement.
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 effectively reduces the likelihood of elastic member entanglement and leakage by ensuring the crotch stretch unit maintains a shrunk state while leg stretch units are stretched, providing a secure fit and preventing bodily waste leakage.
Implementation Method 1
a crotch stretch unit (200a) which is formed within an absorber placement region having the absorber (40) placed within the crotch region (25) and is stretchable at least in a product longitudinal direction L; and a pair of leg stretch units (75) which are formed along the leg hole openings (35) outside the crotch stretch unit (200a) in a product widthwise direction W and can expand and contract at least in the product longitudinal direction L
Data Source
AI summary
In a disposable diaper, ends at a front waistline region side of the disposable diaper within a stretchable range in leg stretch units are configured so as to be closer to an end at the front waistline region side as compared to an end at the front waistline region side within a stretchable range in the crotch stretch unit. Ends at a rear waistline region side within the stretchable range in the leg stretch units are configured so as to be closer to an end at the rear waistline region side as compared to an end at the rear waistline region side within the stretchable range in the crotch stretch unit. A tensile modulus of the crotch stretch unit is configured so as to be greater than a tensile modulus of the leg stretch units.