Irreversible Hydrostatic Pressure Indicator for Food Safety
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Solution Overview
Problem
Current high pressure pasteurization methods lack an inexpensive and irreversible indicator to confirm that food products have been subjected to sufficient pressure to eliminate bacteria, risking food safety and potential product recalls.
Innovation Solution
A device using an incompressible fluid, such as grease, encased in a flexible chamber adjacent to a transparent gas-filled chamber, which visually indicates pressure exposure by compressing the gas until equilibrium is reached, allowing for visual confirmation of the achieved pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure pasteurization is applied to food products, then bacteria are destroyed and shelf life is increased, but there is no reliable indicator to confirm sufficient pressure exposure
Solution Approach 1:
The patent introduces an intermediary indicator device that transfers and visualizes pressure information from the food packaging system. The indicator comprises a flexible chamber with incompressible fluid that responds to pressure changes, providing a visible record of pressure exposure without directly affecting the pasteurization process or food quality.
Solution Approach 2:
The patent employs color change as a visual indication mechanism. The incompressible fluid in the flexible chamber changes position or color state in response to pressure, providing an irreversible visual confirmation that the required pressure threshold has been reached during pasteurization.
2Loss of information
If expensive pressure monitoring equipment is used, then pressure exposure can be confirmed, but cost increases significantly
Solution Approach 1:
The patent employs a disposable, low-cost indicator device that can be attached to each package or batch. The indicator uses simple materials such as incompressible fluid in a flexible chamber, eliminating the need for expensive electronic sensors, data logging systems, or complex monitoring equipment while providing reliable pressure confirmation.
Solution Approach 2:
The indicator device is self-activating and requires no external power source, electronics, or complex operation. The incompressible fluid automatically responds to pressure changes through physical compression, providing self-service pressure indication without requiring external monitoring systems or skilled operation.
3Loss of information
If reversible pressure indicators are used, then pressure exposure can be detected, but the indicator cannot confirm that minimum pressure threshold was reached
Solution Approach 1:
The patent configures the indicator system with pre-set thresholds using the incompressible fluid's physical properties. The flexible chamber and fluid are designed so that at a specific pressure threshold, the fluid undergoes an irreversible change in position or state, automatically recording whether the minimum required pressure has been reached without requiring post-process analysis.
Solution Approach 2:
Instead of using complex electronic sensors that measure pressure continuously and require data interpretation, the patent inverts the approach by using a passive physical system where the incompressible fluid itself becomes the indicator. The fluid's position or state directly shows whether the threshold was reached, simplifying the measurement and interpretation process.
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
Provides a reliable and inexpensive visual indication of whether food products have been subjected to sufficient pressure to destroy bacteria, enhancing food safety and reducing the risk of product recalls.
Implementation Method 1
When hydrostatic pressure is applied to the flexible chamber, the incompressible fluid is squeezed, much like a tube of toothpaste, out of the flexible chamber and into the adjoining transparent gas filled chamber
Implementation Method 2
compressing the gas in that chamber until equilibrium is reached
Implementation Method 3
The basic concept uses Boyles Law, namely that the volume of a gas will change in a linear fashion when compressed by pressure
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
An irreversible pressure indicator, comprising a sealed vessel forming a fluid chamber and at least one indicating chamber; an indicating material contained within the fluid chamber, said material capable of being acted upon by a pressure force; and a gas contained within the indicating chamber, said gas capable of being displaced or compressed by said indicating material, and a method for using the same.