Top Sheet Fiber Density and Blood Slipping Agent for Absorbent Articles
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Solution Overview
Problem
Absorbent articles tend to retain menstrual blood in high fiber density regions, causing discomfort and stickiness on the top sheet, as existing designs do not effectively prevent blood from collecting in these areas.
Innovation Solution
An absorbent article with a liquid-permeable top sheet and liquid-impermeable back sheet, featuring a nonwoven or woven fabric with high and low fiber density regions, where the top sheet includes a blood slipping agent with specific kinematic viscosity, water holding percentage, and molecular weight, ensuring the agent's higher basis weight in high fiber density regions promotes blood migration into the absorbent body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the top sheet is made with high fiber density regions to improve absorption capacity, then absorption performance is improved, but menstrual blood collects in these regions causing stickiness and discomfort
Solution Approach 1:
The top sheet is designed with spatially varying fiber density, creating both high fiber density regions (for absorption) and low fiber density regions (for blood flow). This local differentiation allows different areas to serve different functions: absorption versus blood migration, resolving the contradiction between absorption capacity and stickiness prevention.
Solution Approach 2:
A blood slipping agent is introduced as an intermediary substance in the low fiber density regions. This agent facilitates the movement of menstrual blood from the high fiber density absorption regions toward the absorbent body, preventing blood collection on the top sheet surface while maintaining absorption functionality.
2Object-affected harmful factors
If a blood slipping agent is added to prevent blood collection, then stickiness is reduced, but the device complexity increases
Solution Approach 1:
The blood slipping agent is combined with the top sheet material during manufacturing, integrating the blood-slipping function into the existing structure rather than adding a separate component. This merging approach reduces overall device complexity while maintaining the stickiness-reducing effect.
Solution Approach 2:
The top sheet serves multiple functions simultaneously: it provides absorption capacity through high fiber density regions, facilitates blood migration through low fiber density regions, and prevents stickiness through the blood slipping agent. This multi-functionality reduces the need for additional separate components, simplifying the overall device 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
The solution prevents menstrual blood from easily retaining in high fiber density regions, reducing stickiness and maintaining top sheet smoothness, allowing for effective absorption and comfort.
Implementation Method 1
the top sheet comprises in the excretory opening contact region, a blood slipping agent with a kinematic viscosity of 0.01 to 80 mm2/s at 40° C., a water holding percentage of 0.01 to 4.0 mass % and a weight-average molecular weight of less than 1000
Implementation Method 2
In a top sheet made of a nonwoven fabric or woven fabric, the absorbed menstrual blood tends to collect by capillary movement in the regions of high fiber density
Data Source
AI summary
The objective of the present disclosure is to provide an absorbent article (1) having a high fiber density region (7) in which absorbed menstrual blood is not easily retained, so that after menstrual blood has been absorbed, feelings of stickiness are not easily caused on a top sheet (2), and the top sheet (2) remains dry. The absorbent article (1) of the present disclosure has a liquid-permeable top sheet (2), a liquid-impermeable back sheet (6), and an absorbent body (3). The absorbent article (1) is characterized by: the top sheet (2) having, in an excretory orifice contact region (A), a high fiber density region (7) and a low fiber density region (8); the top sheet (2) containing, in the excretory orifice contact region (A), a prescribed blood lubricating agent (9); and the basis weight of the blood lubricating agent (9) in the high fiber density region (7) being larger than the basis weight of the blood lubricating agent (9) in the low fiber density region (8).