Temperature Traceable Indicator with Phase-Change Barrier Layer
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Solution Overview
Problem
Existing temperature traceable indicators only display temperature history and do not provide additional information, such as factory name, manufacturing number, or manufacturing date, which limits their utility in logistics management.
Innovation Solution
A temperature traceable indicator with a substrate and a temperature indicating laminate, featuring a coloring layer, a color developing layer, and a barrier layer where the barrier layer includes a barrier agent incompatible with the color developer, allowing irreversible color development when the temperature exceeds a preset threshold, enabling the display of temperature history and additional information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a simple color developing layer is used to indicate temperature history, then the indicator can display temperature exceedance, but it cannot provide additional information such as factory name, manufacturing number, or manufacturing date
Solution Approach 1:
The patent combines multiple functions into a single laminate structure: the coloring layer contains both the temperature-responsive color development function and the information display function (through hidden characters, barcodes, or matrix codes printed in the layer). This merging allows the indicator to simultaneously display temperature history and additional product information without requiring separate components.
Solution Approach 2:
The coloring layer is designed to serve multiple purposes: it acts as the temperature-sensitive layer that develops color when exposed to preset temperatures, and simultaneously serves as the information carrier that can display factory names, manufacturing numbers, dates, barcodes, or matrix codes. This multi-functionality resolves the contradiction by enabling rich information display within the existing temperature indicator structure.
2Reliability
If the barrier layer allows color developer diffusion at high temperature, then temperature history can be displayed, but the indicator cannot maintain stability during normal storage
Solution Approach 1:
The barrier layer utilizes phase transition (freezing and melting) of the barrier agent as the core mechanism. During normal storage below the freezing point, the barrier agent remains frozen and maintains a stable, impermeable structure that prevents color developer diffusion. When exposed to preset temperatures above the melting point, the barrier agent melts and allows controlled diffusion of the color developer into the coloring layer, reliably indicating temperature exceedance.
Solution Approach 2:
The patent changes the physical state parameter of the barrier agent from solid (frozen) to liquid (melted) based on temperature. This parameter change fundamentally alters the permeability of the barrier layer: frozen state provides stability and prevents false indication, while melted state enables color development for reliable temperature history display.
3Reliability
If the barrier agent is incompatible with the color developer, then false color development is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The barrier agent acts as an intermediary substance between the color developer and the coloring layer. Its incompatibility with the color developer is precisely what enables its function: when frozen, it forms an impermeable barrier that prevents false diffusion; when melted, it allows controlled passage. This intermediary role, while requiring specific material selection, ensures high indication accuracy by preventing false positives during normal storage.
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
Enables the display of temperature history and additional information, such as hidden characters or codes, facilitating logistics management by preventing falsification of temperature exposure history and allowing for easier identification of product degradation.
Implementation Method 1
a barrier layer arranged between the coloring layer and the color developing layer; and a barrier layer includes a barrier agent that is incompatible with the color developer, freezes at a first temperature
Implementation Method 2
develops a color by melting and allowing the color developer to diffuse into the coloring layer at a temperature exceeding a second temperature
Implementation Method 3
allowing the color developer to diffuse into the coloring layer
Data Source
AI summary
The purpose of the present invention is to provide a temperature traceable indicator capable not only of displaying temperature history, but also adding other additional information. To that end, a temperature traceable indicator according to the present invention is provided with a base material and a temperature indicating laminate disposed on the base material, and is characterized in that the temperature indicating laminate is provided with a coloring layer including a color former, a color developing layer including a color developer for inducing the coloration of the color former, and a barrier layer disposed between the coloring layer and color developing layer, and the barrier layer includes a barrier agent that is immiscible with the color developer, is frozen at a first temperature, and melts beyond a second temperature so as to allow the color developer to become diffused in the coloring layer so that color is produced.