Adhesive Cooling Sheet Moisture Management
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Solution Overview
Problem
Existing cooling gel sheets fail to provide both temporary and persistent cooling effects due to insufficient moisture absorption by hydrophobic fibers, leading to reduced cooling performance, especially in high-temperature and humid environments.
Innovation Solution
A cooling adhesive sheet comprising a hydrous polymer gel with a moisture content of 65% to 95% and a fiber sheet with specific thickness, basis weight, and water absorbency values, allowing efficient moisture transfer and transpiration to maintain a persistent cooling effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the water content of the gel is increased to improve cooling performance, then the cooling effect is improved, but the fiber layer cannot sufficiently absorb moisture leading to reduced persistent cooling
Solution Approach 1:
The patent changes the physical and chemical parameters of the fiber layer by specifying basis weight (3-70 g/m²), thickness (0.001-1 mm), and water absorbency test value (1-16,000 seconds). These parameter adjustments enable the fiber layer to optimally absorb and retain moisture from the gel layer, facilitating sustained evaporation and persistent cooling effect.
Solution Approach 2:
The patent creates a composite structure combining a hydrous polymer gel layer with specific fiber layers. The gel layer provides high water content (65-95% moisture) for cooling, while the fiber layer with controlled absorbency characteristics manages moisture distribution and evaporation, achieving synergistic cooling performance that neither layer could achieve alone.
2Duration of action of stationary object
If the thickness of the hydrous gel layer is increased to increase persistent cooling, then the cooling duration is extended, but the overall moisture management becomes insufficient
Solution Approach 1:
The fiber layer acts as an intermediary between the gel layer and the external environment. It absorbs moisture from the gel layer and controls its release through evaporation, enabling the gel layer to maintain high water content while achieving efficient moisture management and extended cooling duration through regulated moisture transfer.
3Ease of operation
If hydrophobic fiber is used to reduce stickiness, then the comfort upon use is improved, but the cooling effect from heat of vaporization is reduced
Solution Approach 1:
The patent applies different functional qualities to different layers: the gel layer provides high moisture content for cooling, while the fiber layer with controlled hydrophobicity and absorbency characteristics manages moisture distribution. This local differentiation allows the fiber to provide comfort while enabling sufficient moisture absorption for vaporization cooling.
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 sheet effectively utilizes the heat of vaporization for prolonged cooling, maintaining a comfortable cool feeling by preventing excessive moisture accumulation and enhancing cooling performance in humid conditions.
Implementation Method 1
the fiber sheet (B) having a thickness of 0.001 mm or more and 1 mm or less, a basis weight of 3 g/m2 or more and 70 g/m2 or less, and a water absorbency test value of 1 to 16,000 seconds
Implementation Method 2
transpiration of moisture from the fiber sheet to thereby decrease the temperature of the sheet-attached area persistently
Implementation Method 3
water vaporizes insufficiently, and the cooling effect obtained from the heat of vaporization tends to be reduced
Data Source
AI summary
The present invention relates to an adhesive sheet for cooling which preferably maintains a cooling effect utilizing the heat of vaporization of water and can exert a persistent high cooling effect.The adhesive sheet for cooling a hydrous polymer gel (A) and a fiber sheet (B) laminated thereon:the hydrous polymer gel (A) having a moisture content of 65% by mass or more and 95% by mass or less,the fiber sheet (B) having a thickness of 0.001 mm or more and 1 mm or less, a basis weight of 3 g/m2 or more and 70 g/m2 or less, and a water absorbency test value of from 1 to 16,000 seconds;wherein the adhesive sheet has an amount of moisture of 585 g/m2 or more and 1,700 g/m2 or less.