Blood Modifying Agent Top Sheet for Absorbent Articles
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Solution Overview
Problem
Existing absorbent articles fail to provide a smooth, stick-free surface after absorbing highly viscous menstrual blood, leading to residue and an unpleasant visual experience.
Innovation Solution
An absorbent article with a liquid-permeable top sheet containing a blood modifying agent having an IOB of 0.00-0.60, a melting point of no higher than 45°C, and a weight-average molecular weight of less than 1,000, which facilitates rapid migration of menstrual blood to the absorbent body, preventing residue and stickiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If surfactant is used to alter viscosity and surface tension of highly viscous menstrual blood, then liquid absorption rate increases, but sticky feel remains on top sheet after absorption
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight of polypropylene glycol (specifically low molecular weight range of 500-1000) and its concentration (0.01-5% by weight) to achieve optimal blood modification effects. This precise parameter control allows the material to reduce blood viscosity and improve absorption rate while avoiding the sticky feel problem that occurs with higher molecular weights or concentrations.
Solution Approach 2:
The patent uses composite materials by combining polypropylene glycol with other absorbent materials in the absorbent core. This composite approach allows the polypropylene glycol to specifically modify blood properties (reducing viscosity and surface tension) while other materials provide bulk absorption capacity, achieving both rapid absorption and a smooth, stick-free top sheet surface.
2Reliability
If polypropyleneglycol material is applied on top sheet, then absorption performance improves, but sticky feel remains with low molecular weight materials
Solution Approach 1:
The patent resolves this contradiction through precise parameter changes, specifically selecting polypropylene glycol with molecular weight in the range of 500-1000 (low molecular weight) and controlling its concentration at 0.01-5% by weight on the top sheet. This specific parameter range enables the material to effectively modify menstrual blood properties and enhance absorption while maintaining a smooth, non-sticky feel on the top sheet surface.
3Quantity of substance
If high molecular weight polypropyleneglycol material is used, then absorption capacity increases, but tack of material causes sticky feel
Solution Approach 1:
The patent applies parameter changes by selecting polypropylene glycol with molecular weight specifically in the range of 500-1000, which is relatively low. This parameter selection is crucial because lower molecular weight polypropylene glycol provides sufficient blood modification capability (reducing viscosity and surface tension) without exhibiting excessive tackiness. The patent explicitly avoids higher molecular weights that would increase absorption capacity but also increase stickiness, thereby maintaining a smooth feel on the top sheet.
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 absorbent article ensures a smooth, stick-free top sheet and effective absorption of highly viscous menstrual blood, preventing residue and maintaining a pleasant appearance.
Implementation Method 1
PTL 1, for example, describes an absorbent article that includes cellulose-based hydrophilic fiber comprising one or more surfactants selected from the group consisting of sugar alkyl ethers and sugar fatty acid esters
Implementation Method 2
the top sheet comprises a blood modifying agent which facilitates rapid migration of menstrual blood to an absorbent body
Data Source
AI summary
An absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body between the liquid-permeable top sheet and liquid-impermeable back sheet. The liquid-permeable top sheet includes a blood modifying agent with an IOB of 0.00-0.60, a melting point of no higher than 45° C., a water solubility of 0.00-0.05 g in 100 g of water at 25° C., and a weight-average molecular weight of no greater than 1,000.