Irreversible Temperature Indicator Layer for Accurate Overheat Recording
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Solution Overview
Problem
Existing temperature indicators based on phase transition of a heat-sensitive component face issues with accuracy, flexibility, adhesion, and safety due to phase boundary changes, leading to inaccurate temperature recording and potential operational hazards.
Innovation Solution
A device with a layered structure comprising a non-transparent base, heat-sensitive material with voids, and a transparent protective layer that irreversibly changes appearance upon reaching a threshold temperature due to microstructural changes, ensuring high contrast and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a heat-sensitive material with phase transition is used for temperature indication, then the device can visually record temperature exceedance, but the material may flow or change appearance inaccurately due to phase boundary changes
Solution Approach 1:
The patent introduces a non-transparent base layer with specific optical properties that creates local contrast. The heat-sensitive material is applied only to specific areas of this base, creating localized temperature indication zones. This local quality approach ensures that temperature changes are clearly visible against the contrasting background while preventing inaccurate flow or appearance changes in other areas.
Solution Approach 2:
The device combines multiple materials with different properties: a non-transparent base material providing structural support and optical contrast, a heat-sensitive material with controlled phase transition, and a transparent protective layer. This composite structure allows each material to perform its specific function while working together to achieve accurate and safe temperature indication.
2Illumination intensity
If the heat-sensitive material layer is made thicker to improve visibility, then the color change is more pronounced, but the material flow and adhesion problems increase
Solution Approach 1:
The patent employs a thin film approach for the heat-sensitive material layer, applying it as a thin coating on the non-transparent base. This thin film structure provides sufficient visual contrast when the material undergoes phase transition while preventing excessive material flow. The transparent protective layer further enhances the thin film structure, providing protection without adding significant thickness.
3Adaptability or versatility
If the device is made more flexible to adapt to surface shapes, then it can be applied to various geometries, but adhesion and structural integrity deteriorate
Solution Approach 1:
The device is segmented into distinct functional layers: a flexible non-transparent base layer that adapts to surface geometry, a thin heat-sensitive material layer applied to specific areas, and a transparent protective layer. This segmentation allows each layer to perform its specific function - the base provides flexibility and adhesion, while the thin heat-sensitive layer maintains structural integrity during phase transition.
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 device provides reliable, rapid, and safe visual recording of temperature exceedance with high accuracy and durability, preventing material flow and maintaining operational safety throughout its service life.
Implementation Method 1
the microstructure of which includes particles of solid organic substance and voids filled with the gas phase; a transparent protective layer that partially or completely covers the front surface of the device; in this case, the device is designed with the ability to irreversibly change its appearance upon reaching at least one threshold temperature indicated on it due to the destruction of the microstructure of the corresponding heat-sensitive material, accompanied by the fusion of particles of solid organic substance
Implementation Method 2
heat-sensitive material having a special microstructure... designed with the ability to irreversibly change its appearance upon reaching at least one threshold temperature
Data Source
AI summary
The invention relates to devices for visually recording the fact of excess of temperature, namely to devices for recording the fact of excess of temperature above at least one threshold value, the operating principle of which is to change the microstructure of a heat-sensitive material at given threshold temperature values, accompanied by an irreversible visual effect, as well as variants of the method for manufacturing this device. The device for visually recording the excess of temperature above at least one threshold value, having a layered structure including: —a base that is non-transparent to at least part of visible light, on the front surface of which inscriptions are applied indicating at least one numerical threshold temperature value; —at least one temperature-sensitive material that is non-transparent to at least part of visible light, applied to individual sections of the base, the microstructure of which includes particles of solid organic substance and voids filled with the gas phase; —a transparent protective layer that partially or completely covers the front surface of the device. In this case, the device is designed with the ability to irreversibly change its appearance upon reaching at least one threshold temperature indicated on it due to the destruction of the microstructure of the corresponding heat-sensitive material, accompanied by the fusion of particles of solid organic substance, a decrease in the fraction of voids and an increase in its transparency with the development of the color of the base. Variants of a method for manufacturing the device for visually recording the excess of temperature above at least one threshold value are also disclosed. The group of inventions provides for an increase in the reliability and accuracy of visually recording the fact that the temperature has exceeded at least one threshold value, the impossibility of returning the heat-sensitive material to its original state, an increase in the operating speed of the heat-sensitive material, including under conditions of short-term peak loads of controlled equipment elements or emergency operating modes, as well as an increase in the safety of operation of both the controlled equipment and the recording device itself throughout its entire service life.