Laminated Indicator Device with Rupturable Barrier for Time Tracking
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Solution Overview
Problem
Existing indicators for detecting the passage of time or package compromise are often unstable before activation, effective only over short periods, and respond inadequately to external agents like oxygen or carbon dioxide, limiting their utility in extending the shelf life of perishable goods.
Innovation Solution
A laminated indicator device comprising an indicator section, an activator section, and a barrier section, where the barrier layer is impermeable to the activating agent, allowing controlled exposure upon rupture, using an organic acid as the activating agent and a pH-sensitive material to display visible changes over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas diffusion technologies are used for detecting passage of time or package compromise, then the indicator can respond to external agents like oxygen or carbon dioxide, but the indicator becomes unstable before activation and is effective only over short time periods
Solution Approach 1:
The indicator device is divided into separate sections: an indicator section containing the indicator material, an activator section containing the activating agent, and a barrier section separating them. This segmentation prevents premature interaction between components while enabling controlled activation, thereby achieving both long-term stability and extended effective duration.
Solution Approach 2:
A barrier layer acts as an intermediary between the indicator material and activating agent. This barrier prevents direct contact during storage (ensuring stability) while allowing controlled permeation or rupture (enabling activation). The barrier mediates the interaction timing, resolving the contradiction between stability and duration.
2Ease of operation
If a barrier layer is made removable or rupturable to allow activating agent contact with indicator material, then the device can be activated to show time passage or compromise, but the device complexity increases
Solution Approach 1:
The barrier is implemented as a thin film or laminated layer that can be easily removed or ruptured. This flexible film approach simplifies the activation mechanism while maintaining the necessary separation function, reducing operational complexity despite the laminated structure.
Solution Approach 2:
The barrier transitions from a static sealed state to a dynamic activated state through removal or rupture. This dynamic transition allows the system to switch between stable storage and active indication modes, simplifying the overall operation while managing the laminated structure's complexity.
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 stable, long-term indication of time passage or package compromise, effectively extending the shelf life of perishable goods by ensuring accurate assessment of freshness and preventing consumption of unfit items.
Implementation Method 1
an indicator section (200) comprising an indicator material that displays different visible properties in response to the presence or absence of an activating agent
Data Source
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AI summary
There is described an indicator device comprising: an indicator section comprising an indicator material that displays different visible properties in response to the presence or absence of an activating agent; an activator section comprising an activating agent that effects a change in the visible properties of the indicator material; and a barrier section comprising a barrier layer that is substantially impermeable to the activating agent, the barrier section being located between the indicator section and the activator section; wherein at least part of the barrier layer is configurable to allow the activating agent and the indicator material to come into contact with each other, thereby effecting a visible change. The device may be used to detect or report the passage of time and can be applied to perishable goods and/or associated packaging to show that packaging has been compromised and/or that the device has been compromised.