Peached Cooling Fabric Structure for Sustained Evaporative Thermal Management
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Solution Overview
Problem
Current fabrics fail to provide effective, long-term evaporative cooling without the use of chemicals, as they rapidly transport moisture away from the skin, leading to short-term cooling that requires frequent rehydration and is impractical for individuals exposed to prolonged heat.
Innovation Solution
A fabric is developed by weaving or knitting yarns with specific material compositions and configurations, where the back side is hydrophobic for liquid transfer, the interior stores liquid, and the front side is hydrophilic to slow evaporation, creating a controlled environment for extended cooling without chemical assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional fabric materials are used to transport moisture away from the skin, then moisture dispersal is improved, but cooling duration is reduced to a very short period
Solution Approach 1:
The fabric employs different fiber types in different layers: hydrophobic fibers (polyester) in the back layer for rapid moisture wicking, hollow fibers in the intermediate layer for moisture storage and evaporative cooling, and hydrophilic fibers (nylon) in the front layer for controlled moisture release. This spatial differentiation of material properties resolves the contradiction between fast moisture transport and extended cooling duration.
Solution Approach 2:
The fabric structure nests multiple functional layers within each other: the back layer with hydrophobic fibers is nested within the intermediate hollow fiber layer, which is in turn nested within the front hydrophilic fiber layer. This nested configuration allows each layer to perform its specific function while contributing to the overall extended cooling effect.
2Temperature
If towels are repeatedly saturated in cold water to maintain cooling, then cooling effect is improved, but ease of operation deteriorates due to constant effort required
Solution Approach 1:
The fabric's intermediate layer with hollow fibers automatically stores moisture and provides evaporative cooling without requiring user intervention. Once the fabric is initially wetted, it self-regulates the cooling process by controlling moisture evaporation, eliminating the need for repeated saturation and associated user effort.
Solution Approach 2:
The fabric provides continuous cooling action through its intermediate hollow fiber layer that stores moisture and maintains evaporative cooling over an extended period. This continuous action eliminates the need for intermittent re-saturation, providing sustained cooling without repeated user effort.
3Temperature
If ice is used for cooling, then cooling effectiveness is improved, but adaptability deteriorates due to limited availability and inability to conform to body areas
Solution Approach 1:
The fabric employs flexible thin film structures that can conform to various body contours and areas. The fabric's flexible nature allows it to adapt to different body shapes and sizes, providing consistent cooling effectiveness across diverse application areas without the rigidity constraints of ice.
Solution Approach 2:
The fabric uses composite materials combining hydrophobic polyester fibers, hollow fibers for moisture storage, and hydrophilic nylon fibers to achieve cooling effectiveness comparable to ice while maintaining flexibility and adaptability. This composite structure provides both thermal regulation and conformability.
4Temperature
If alcohol-dipped towels are used for cooling, then cooling effect is improved, but harmful factors increase due to skin irritation and rashes
Solution Approach 1:
The fabric uses water as the cooling medium instead of alcohol, providing a safe, non-irritating alternative. The fabric itself is designed to be reusable and durable, contrasting with the disposable nature of alcohol towels, while eliminating the harmful chemical effects of alcohol on skin.
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 fabric maintains a sustained thermal condition for an extended period with minimal effort, effectively regulating moisture release and providing evaporative cooling by storing and slowly releasing liquid, enhancing cooling capabilities beyond conventional fabrics.
Implementation Method 1
The back side is or includes a hydrophobic fiber material... the liquid is wicked within the conduit established by each individual fiber to facilitate transport
Implementation Method 2
the interior includes an intermediary material and/or configuration that stores... the front side is or includes a hydrophilic fiber material
Implementation Method 3
Evaporative cooling is the natural effect of moisture escaping into the atmosphere at will. The ability to regulate the rate of moisture dispersal and create one's personal cooling environment
Implementation Method 4
the front side is or includes a hydrophilic fiber material... configured to cause the transfer of liquid out of the fabric to occur at a rate that is slower
Data Source
AI summary
A fabric for thermal management including the cooling of an object, such as a person's skin. The fabric is formed of a plurality of materials including at least one liquid transport enhancing material and at least one evaporative transport impeding material. When the fabric is in use, the transport enhancing material is located near an object to be cooled, while the evaporation impeding material is spaced away from the object. The fabric is peached so that there is an entanglement of the two materials. Peaching is performed on both sides of the fabric, but initially on the side with the transport enhancing material such that a portion of the evaporation impeding material is pulled into the fabric core. A method of making the fabric is also described.