Coelenterazine Chemiluminescent Wetness Indicator for Absorbent Products
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Solution Overview
Problem
Current absorbent products, such as diapers and adult incontinence pads, face challenges in effectively retaining fluid, leading to skin wetness and potential skin irritation due to the tendency of cellulosic fluff pulp fibers to release liquid under pressure, and the high void volume of superabsorbent polymers causing interstitial liquid and 'rewet' issues, while existing moisture indicators are inadequate for nighttime use as they require external light sources and can disturb users.
Innovation Solution
Incorporation of chemiluminescent materials like coelenterazine, which generates light upon contact with moisture, allowing for visual indication of wetness without external excitation, enabling detection through clothing and reducing the need for nighttime disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cellulosic fluff pulp fibers are used in the absorbent core, then the product is inexpensive and biodegradable, but the fibers release liquid under pressure causing skin wetness and compromising absorbency
Solution Approach 1:
The patent combines cellulosic fluff pulp fibers with superabsorbent polymer (SAP) particles to create a composite absorbent core. The SAP particles are dispersed throughout the fluff pulp matrix, creating a multi-component system where the SAP provides liquid retention through gel formation while the fluff pulp provides structural integrity and cost-effectiveness. This composite approach resolves the contradiction by leveraging the complementary strengths of both materials.
Solution Approach 2:
The patent utilizes the porous structure of fluff pulp fibers as a matrix for SAP dispersion. The interstices between fibers provide a three-dimensional network that holds SAP particles while maintaining fluid permeability. This porous architecture allows the SAP to access liquid through capillary action while the fiber matrix prevents collapse under pressure, resolving the contradiction between liquid retention and structural stability.
2Reliability
If superabsorbent polymers with high gel strength are used, then fluid retention capacity is improved, but void volume increases causing interstitial liquid and rewet issues
Solution Approach 1:
The patent creates local variations in porosity and absorption characteristics within the absorbent core by dispersing SAP particles of different sizes and gelation states throughout the fluff pulp matrix. Regions with higher SAP concentration provide enhanced retention, while regions with lower concentration maintain porosity for fluid distribution. This spatial heterogeneity resolves the contradiction by optimizing both retention capacity and fluid transport pathways simultaneously.
Solution Approach 2:
The patent employs SAP particles that are partially swollen rather than fully gelated, allowing them to absorb fluid to a moderate extent while maintaining sufficient porosity for continued fluid uptake. This partial action approach prevents excessive gelation that would create interstitial liquid, while still providing adequate retention capacity through the cumulative effect of multiple partially-swollen particles distributed throughout the matrix.
3Measurement precision
If traditional moisture indicators requiring external light sources are used, then wetness detection is possible, but nighttime use is disturbed and user comfort is compromised
Solution Approach 1:
The patent incorporates chemiluminescent materials that automatically generate light upon contact with moisture, eliminating the need for external light sources. The indicator system serves itself by using the moisture itself as the trigger for light emission, providing self-illuminated wetness detection that works seamlessly in dark environments without requiring user intervention or external power sources.
Solution Approach 2:
The patent utilizes chemiluminescent compounds that undergo color or brightness changes upon exposure to moisture. The indicator material transitions from a dark or dim state to a luminous state when wetness is detected, providing clear visual feedback without requiring external illumination. This color/brightness change mechanism enables intuitive wetness detection in low-light conditions while maintaining user comfort during nighttime use.
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 chemiluminescent system provides improved ease of insult detection, allowing for more frequent checks without disturbing the user, reducing skin contact time with fluid and enhancing skin health and comfort by maintaining luminescence intensity over extended periods.
Implementation Method 1
Incorporation of chemiluminescent materials like coelenterazine, which generates light upon contact with moisture, allowing for visual indication of wetness without external excitation
Data Source
AI summary
Disclosed herein are synthesis methods for coelenterazine. Also disclosed are articles including the coelenterazine and coelenterazine derivatives. Representative absorbent articles include disposable diapers and adult incontinence products.