Absorbent Article Rear Region Segmentation for Run-Down Urine
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Solution Overview
Problem
Conventional absorbent articles fail to prevent urine from spreading and wetting the skin when the urination orifice is not contacted with the absorbent article, leading to skin irritation and discomfort.
Innovation Solution
The absorbent article incorporates a configuration with a liquid-pervious topsheet, a liquid-impervious backsheet, an absorption body with a penetration part and compressed grooves, and an absorbent sheet with absorbent polymer sandwiched between liquid-pervious sheets, which allows urine to be absorbed and distributed widely, preventing it from reaching the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-repellent sheet is disposed in the rear part to prevent liquid excrement return, then liquid excrement absorption effectiveness is improved, but urine that runs down the skin cannot be absorbed and the skin remains wetted
Solution Approach 1:
The absorbent article is divided into distinct functional regions: a crotch region with high absorbency for direct urine reception, and rear portions with water-repellent properties to prevent return flow. The absorption body has different configurations in different zones, with the front portion having higher absorbency and the rear portion having water-repellent characteristics to manage run-down urine differently.
Solution Approach 2:
Different regions of the absorbent article have different material properties tailored to their specific functions. The front crotch region uses highly absorbent materials to capture urine at the source, while the rear regions use water-repellent sheets to prevent urine that runs down the skin from soaking into the diaper back, keeping the skin dry in areas where urine flow is expected.
2Productivity
If the absorption body has high absorbency to absorb urine quickly, then absorption rate is improved, but urine may spread on the water-repellent sheet and wet the skin when orifice contact is poor
Solution Approach 1:
The absorbent article is pre-configured with an absorbent sheet containing absorbent polymer in the rear portions before urine contact occurs. This preliminary placement of absorbent material in anticipation of urine flow ensures that when urine runs down the skin during wear, it is immediately absorbed by the pre-positioned absorbent polymer, preventing skin wetting before it can occur.
Solution Approach 2:
An absorbent sheet containing absorbent polymer is introduced as an intermediary layer between the water-repellent sheet and the skin in the rear portions. This intermediary absorbent sheet captures urine that runs down the skin, preventing direct contact with the skin while the water-repellent sheet prevents urine from penetrating deeper into the diaper structure.
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
This configuration keeps the skin dry and comfortable by effectively absorbing and managing urine, even when it runs down the skin, thereby preventing skin wetting and irritation.
Implementation Method 1
an absorbent sheet (60) is disposed between the topsheet (20) and the second sheet (50)... an absorbent polymer (61) is sandwiched between two liquid-pervious sheets (62, 63)
Implementation Method 2
the absorption body (40) has a penetration part (41) and compressed grooves (42)... allowing urine to be absorbed and distributed widely
Data Source
Figure 1
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AI summary
An absorbent article ensuring that even when the excreted urine diffuses by running down the wearer's skin, the skin is prevented from remaining wetted. An absorbent article 1 in which the longitudinal direction from the front side to the rear side consists of a front waist region 11, a rear waist region 12 and a crotch region 13 located between these regions and an absorbent sheet 60 between the topsheet 20 and the second sheet 50 comprising at least one liquid-pervious sheet having sandwiched thereby an absorbent polymer is present between a topsheet 20 and a second sheet 50, wherein: the second sheet 50 is higher in the liquid diffusibility than the topsheet 20; the topsheet 20, the backsheet 30, the absorption body 40 and the second sheet 50 are disposed across the front waist region 11, the crotch region 13 and the rear waist region 12; and the absorbent sheet 60 is disposed in at least a part of the rear waist region 12.