Thermochromic Layer Over Mark for Hot-Surface Safety Warning
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Solution Overview
Problem
Existing systems with heated surfaces, such as garment care and cooking devices, pose a safety risk as users may not be aware that the surface is still too hot to touch safely after use, and current thermochromic solutions face challenges in achieving high resolution and clarity due to the large size of thermochromic pigment particles.
Innovation Solution
A system where a thermochromic material layer, mixed with a binder like fluoropolymer or sol-gel, is applied over a mark on the surface, changing light absorption to make the mark visible when the surface exceeds a threshold temperature, allowing the information to be seen through the layer without requiring the mark to be formed from thermochromic material, thus avoiding processing difficulties and enhancing clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mark is formed using thermochromic pigment particles through conventional silk screen printing, then the safety warning function is achieved, but the resolution and clarity of the mark are compromised due to the large particle size
Solution Approach 1:
The invention separates the mark formation process from the thermochromic material application. The mark is first printed using conventional methods with small particles or dyes to achieve high resolution, then a separate thermochromic layer is applied over the mark. This segmentation allows each layer to be optimized independently - the mark layer for clarity and the thermochromic layer for temperature-responsive visibility.
Solution Approach 2:
The thermochromic layer acts as an intermediary that modulates the visibility of the underlying mark based on temperature. Rather than requiring the mark itself to be thermochromic (which would require large particles), the thermochromic layer serves as a mediator that reveals or conceals the high-resolution mark beneath it, achieving both clarity and safety warning function.
2Reliability
If thermochromic pigment particles are used in conventional silk screen printing, then the temperature indication function is achieved, but processing difficulties occur such as choking of the silk screen
Solution Approach 1:
The printing process is segmented into two independent steps: first printing the mark design using conventional inks or dyes that flow easily through silk screens, then applying a separate thermochromic material layer. This eliminates the need to mix thermochromic particles into the printing ink, thereby avoiding screen choking while maintaining temperature indication capability.
Solution Approach 2:
The thermochromic material layer serves as an intermediary applied after mark formation. It can be deposited as a slurry, paste, or coating that does not require passing through fine silk screen apertures, thus avoiding processing difficulties while still providing the temperature-responsive visibility function.
3Ease of manufacture
If thermochromic material is mixed directly into the mark composition, then the visual response to temperature change is achieved, but the clarity of the information is compromised
Solution Approach 1:
The invention segments the visual information carrier (mark) from the temperature-responsive material (thermochromic layer). The mark is created first with high clarity using conventional printing, then the thermochromic material is applied as a separate overlay. This segmentation preserves the mark's clarity while achieving temperature-responsive visual feedback.
Solution Approach 2:
Different regions of the structure have different functions: the underlying mark layer provides high-clarity visual information, while the upper thermochromic layer provides temperature-dependent optical properties. This local differentiation of quality allows each layer to optimize its specific function without compromising the other.
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 provides a clear and safe visual warning when the surface is too hot, improving user safety by ensuring the mark is visible and legible above the threshold temperature, while the binder offers abrasion resistance and non-stick properties, addressing the limitations of previous thermochromic solutions.
Implementation Method 1
the layer comprises a thermochromic material adapted to change the light absorption of the layer such that the mark becomes visible when the temperature of the layer exceeds a threshold temperature
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3B
AI summary
Provided is a system (100) having a surface (102). A mark (104) is arranged on the surface, which mark represents visual information. A layer (106) is disposed over the mark. The layer is heated by a heating element (103). The layer comprises a thermochromic material for changing the light absorption of the layer at a visible wavelength when the temperature of the layer exceeds a threshold temperature. The layer is sufficiently optically transmissive (at or) above the threshold temperature that the visual information provided by the mark becomes visible.