Temperature Indicator Ink for Irreversible Bidirectional Excursion Detection
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Solution Overview
Problem
Existing temperature indicators lack irreversibility, making them susceptible to tampering, and fail to detect both temperature increases and decreases effectively, which is critical for ensuring the integrity of perishable products during distribution.
Innovation Solution
A temperature detecting material comprising a first and second temperature indicating material with leuco dye, a color developing agent, and a decoloring agent, exhibiting hysteresis characteristics, allowing detection of both temperature increases and decreases, and enabling function initialization through controlled color changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a reversible temperature indicating material is used, then the indicator can be reused and initialized easily, but the indicator becomes susceptible to tampering and cannot guarantee temperature control integrity
Solution Approach 1:
The temperature indicating material is divided into two separate materials with different temperature response characteristics. The first material responds to temperature increases (colorless to colored), while the second material responds to temperature decreases (colored to colorless). This segmentation allows each material to provide irreversible indication in its respective direction, preventing tampering while maintaining reusability through controlled initialization at elevated temperatures.
Solution Approach 2:
The invention combines two different temperature indicating materials with complementary irreversible characteristics into a single composite indicator system. This composite structure enables the indicator to provide reliable irreversible detection for both temperature excursions above and below the target range, while the entire composite can be reset by heating to a predetermined temperature, balancing reliability with reusability.
2Device complexity
If a temperature indicating material detects only temperature increase, then the material structure can be simpler, but it cannot detect temperature decrease which is critical for full temperature monitoring
Solution Approach 1:
The temperature detection function is segmented into two specialized materials: one optimized for detecting temperature increases and another for detecting temperature decreases. Each material has a simpler individual structure focused on its specific detection direction, but together they provide comprehensive bidirectional temperature monitoring capability.
3Reliability
If absolute irreversibility is implemented for expensive pharmaceutical products, then tampering is prevented, but the indicator cannot be reused for normal temperature transportation and storage
Solution Approach 1:
The initialization temperature parameter is set to a predetermined elevated temperature that is high enough to reset both the first and second temperature indicating materials, thereby restoring their detection capabilities. This parameter selection enables the indicator to maintain anti-tampering functionality during distribution while allowing reuse for subsequent normal temperature transportation and storage operations.
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 reversible and irreversible temperature detection capability, ensuring the integrity of products by accurately monitoring temperature excursions and allowing for easy initialization of the temperature indicator's function, thus enhancing the reliability of temperature control during distribution.
Implementation Method 1
the first temperature indicating material and the second temperature indicating material each contain a leuco dye, a color developing agent, and a decoloring agent, and have a hysteresis characteristic in a color density-temperature curve
Implementation Method 2
turns to a non-crystalline state when cooled down after melting to below the color developing temperature Ta1 in the temperature increase process with a cooling speed more than a predetermined cooling speed
Implementation Method 3
have a hysteresis characteristic in a color density-temperature curve, wherein the first temperature indicating material has a color developing temperature Ta1 in a temperature increase process lower than the decoloring temperature Td1 in a temperature increase process
Data Source
AI summary
A temperature detecting material comprises a first material containing a first temperature indicating material and a second material containing a second temperature indicating material, wherein the first temperature indicating material and the second temperature indicating material contain a leuco dye, a color developing agent, and a decoloring agent, and have a hysteresis characteristic in their color density-temperature curves, wherein the first temperature indicating material has a color developing temperature in a temperature increase process lower than a decoloring temperature in the temperature increase process, and turns to a non-crystalline state and is kept in a decoloring state when cooled down below the color developing temperature in the temperature increase process with a predetermined cooling speed or more after melting, wherein the second temperature indicating material, a color developing temperature is lower than a decoloring temperature in the temperature increase process, and wherein the color developing temperature in the temperature increase process is lower than the decoloring temperature in the temperature increase process and the color developing temperature is lower than the color developing temperature in the temperature increase process.