Color Changing Expiration Indicator Layered Barrier System
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Solution Overview
Problem
Traditional expiration dates on product packaging can be difficult for consumers to locate and read, leading to misuse or disposal of products, resulting in health and safety issues due to unclear expiration status.
Innovation Solution
A color-changing expiration indicator system using alternating layers of reactive and barrier materials that change color upon migration, allowing consumers to easily determine if a product has expired by printing these indicators on adhesive tags that can be placed prominently on products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional printed expiration dates are used on product packaging, then the expiration information can be provided, but the information is difficult for consumers to locate and read
Solution Approach 1:
The patent applies color change technology where the expiration indicator transitions from one color state to another when the product reaches its expiration date. This visual transformation makes the expiration status immediately apparent to consumers, solving the problem of difficult-to-locate and read expiration information by providing a prominent, easily distinguishable visual signal.
Solution Approach 2:
The patent utilizes changes in physical or chemical parameters of the indicator material over time. The indicator undergoes measurable parameter changes (such as color intensity, fluorescence, or other optical properties) that correlate with the passage of time since production, enabling consumers to easily determine whether a product has expired without needing to locate and interpret traditional printed dates.
2Loss of information
If a color changing indicator system with multiple layers is implemented, then the expiration indication becomes visible and readable, but the device complexity increases
Solution Approach 1:
The patent divides the expiration indicator into multiple functional layers, each performing a specific role: a substrate layer, a reactive layer containing the indicator material, a barrier layer to control reaction rate, and a readout layer. This segmentation allows each layer to be optimized for its specific function while working together to provide clear expiration indication, managing the complexity through functional specialization.
Solution Approach 2:
The patent introduces intermediary layers (such as barrier layers with controlled permeability) that mediate between the reactive layer and the environment. These intermediary layers control the rate at which reactants reach the indicator material, thereby controlling the timing and clarity of the color change while simplifying the overall system design by providing a straightforward mechanism for time-based indication.
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 system ensures consumers can quickly identify expired products, reducing misuse and enhancing safety by providing a visible and readable indication of product freshness.
Implementation Method 1
at least a portion of the reactive layer is configured to migrate through the transmission layers
Implementation Method 2
a reactant layer that is configured to change color responsive to a reaction that occurs between the reactant layer and the reactive layer
Data Source
AI summary
A color changing expiration indicator includes a reactive layer and a first barrier layer that covers at least a portion of the reactive layer. The color changing expiration indicator also includes a transmission layer that covers at least a portion of the first barrier layer, and a second barrier layer that covers at least a portion of the transmission layer. The color changing expiration indicator further includes a reactant layer that covers at least a portion of the second barrier layer. The reactant layer changes color responsive to a reaction that occurs between the reactant layer and the reactive layer.