Disposable Diaper Crotch Unit Segmentation for Comfort and Absorption
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Solution Overview
Problem
Conventional disposable diapers face issues with wearing comfort due to the crotch unit not being able to expand and contract like the waistline units, leading to skin problems and reduced absorption efficiency, and excessive constriction causing unpleasant feelings during movement.
Innovation Solution
A disposable diaper design featuring a crotch unit that can expand and contract independently, with inflected units and a reinforcing sheet to maintain a flat shape, allowing for improved fitting and absorption performance without hindering movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the crotch unit is made to fit the body tightly to achieve wearing comfort like underwear, then the wearing comfort is improved, but the absorption speed of liquid by the absorber decreases and liquid may return to the skin
Solution Approach 1:
The diaper is divided into a waistline retaining unit and a crotch unit that are provided independently without intersecting. The crotch unit includes an absorber and can be expanded and contracted independently from the waistline retaining unit, allowing the absorber to maintain appropriate density for absorption while the waistline provides fit and containment.
2Ease of operation
If excess space is provided from the waistline retaining unit up to the crotch region to allow movement, then the wearing comfort during movement is improved, but the periphery of the leg hole opening units must be fitted tightly which causes strong constriction and unpleasant feeling
Solution Approach 1:
The diaper structure separates the waistline retaining unit from the crotch unit, allowing the crotch region to have appropriate space for movement while the waistline provides necessary containment. This segmentation eliminates the need for excessive tightening at the leg holes to prevent sagging.
3Ease of operation
If the crotch unit is made to fit the body tightly, then the wearing comfort is improved, but the density of the absorber rises causing pressure on the absorber during movement which makes liquid return back to the skin
Solution Approach 1:
The independent crotch unit with its own absorber is separated from the waistline retaining unit. This allows the absorber to maintain optimal density and structure for absorption without being compressed by tight fitting, ensuring reliable absorption performance even during movement.
Data Source
AI summary
A disposable diaper includes: a first inflected unit formed in an absorber and extending along a product widthwise direction; a second inflected unit formed in the absorber, extending along the product widthwise direction, and positioned towards a rear waistline unit from the first inflected unit; and a crotch unit formed between the first inflected unit and the second inflected unit. The size of the crotch unit along the product longitudinal direction is 30 mm or more and 150 mm or less in the natural state of the disposable diaper.