Disposable Diaper Absorber with Variable Bending Rigidity
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Solution Overview
Problem
Disposable diapers with fastening tapes often result in wrinkles at the leg stretch and leg side stretch units, leading to improper positioning of the hips when worn, causing deviation in the wearing position.
Innovation Solution
A disposable diaper design featuring a front waistline region, rear waistline region, and crotch region with a pair of fastening tapes extending from the rear waistline to the front, incorporating leg stretch units and leg side gathers that expand and contract along the product longitudinal direction, and a crotch stretch unit that maintains a flat shape, with distinct regions of varying bending rigidity to prevent wrinkles and ensure correct positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the leg stretch unit and leg side stretch unit are configured to be stretchable in the product longitudinal direction, then the diaper can adapt to different body shapes and sizes, but wrinkles occur in the region where the end of these units is arranged, causing deviation in wearing position
Solution Approach 1:
The absorber is divided into multiple regions with different bending rigidities. The first region (rear waistline region) has higher bending rigidity to maintain flatness and prevent wrinkles, while the second region (crotch region) has lower bending rigidity to accommodate body contours. This local differentiation resolves the contradiction by providing both wrinkle prevention in critical areas and adaptability in other regions.
Solution Approach 2:
The absorber is segmented into a first region extending from the rear waistline region towards the crotch region, and a second region arranged adjacent to the first region at the crotch side. This segmentation allows each region to have different bending rigidity characteristics, enabling the diaper to maintain wearing position accuracy while adapting to body shape.
2Ease of manufacture
If the absorber is made with uniform bending rigidity, then the structure is simple and easy to manufacture, but wrinkles occur in the stretch unit regions causing improper positioning
Solution Approach 1:
Instead of uniform bending rigidity, the absorber has different bending rigidities in different regions. The first region (rear waistline area) has higher bending rigidity to prevent wrinkles and ensure positioning accuracy, while the second region (crotch area) has lower bending rigidity for comfort and adaptability. This local quality variation resolves the contradiction between manufacturing simplicity and positioning precision.
3Ease of operation
If the leg stretch unit ends are arranged at the rear waistline region, then the diaper can be easily put on, but wrinkles occur causing deviation in wearing position
Solution Approach 1:
The first region with higher bending rigidity is positioned in the rear waistline region where the leg stretch unit ends are arranged. This high rigidity region prevents wrinkle formation in the critical area where positioning occurs, while still allowing the leg stretch unit to function for easy putting on. The local quality enhancement resolves the contradiction between ease of operation and positioning accuracy.
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 and correct placement of the diaper, preventing deviation of the wearing position by controlling the expansion and contraction of the stretch units and maintaining a smooth absorber shape, ensuring proper fit and comfort.
Implementation Method 1
a leg stretch unit (75) arranged around the leg hole openings and can expand and contract along at least the product longitudinal direction, and an leg stretch unit stretch unit (80) arranged at the inner side in the product widthwise direction from the leg stretch unit, and having a contracted unit (84) that can expand and contract along the product longitudinal direction
Implementation Method 2
an absorber (40) running across the crotch region and extending in the front waistline region and the rear waistline region, wherein the absorber includes a first region (41) extending from an end at the side of the rear waistline region of the absorber towards a side of the crotch region, and a second region (42) arranged adjacent to the first region at the side of the crotch region from the first region, and having a lower bending rigidity than the first region
Data Source
AI summary
An absorber of a disposable diaper includes a first region extending from an end at the side of the rear waistline region of the absorber towards a side of the crotch region, and a second region arranged adjacent to the first region at the side of the crotch region from the first region, and having a lower bending rigidity than the first region. The end at the side of the rear waistline region of the leg stretch unit and the end at the side of the rear waistline region of the contracted unit in the leg side stretch unit are arranged at the side of the crotch region from the end at the side of the rear waistline region of the first region, and are also arranged at the side of the rear waistline region from the end at the side of the crotch region of the first region.