Permeability Measurement Device Using Electrical Conductivity
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Solution Overview
Problem
Current methods for determining the permeability of packaging materials are time-consuming and lack reliability, requiring hours to stabilize and provide accurate results.
Innovation Solution
A method and device that measure the electrical properties of a sample's surface conductivity over time, using a fluid medium to determine the transmission rate through the sample, allowing for quick and reliable assessment of vapor or gas permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional vapor permeability measurement methods are used, then accurate permeability data can be obtained, but the measurement process requires many hours to stabilize and provide results
Solution Approach 1:
The patent replaces conventional mechanical/equilibrium-based permeability measurement systems with an electrical measurement system. Electrical conductivity probes are used to detect changes in electrical properties of the material as vapor permeates through it, substituting the traditional time-consuming equilibrium pressure differential method with a rapid electrical property detection method that provides accurate permeability data within minutes
Solution Approach 2:
The patent changes the measurement parameter from equilibrium vapor pressure differential to dynamic electrical conductivity changes. By monitoring how electrical conductivity varies over time during vapor permeation, the system captures permeability kinetics without requiring the system to reach equilibrium, dramatically reducing measurement time while maintaining accuracy
2Reliability
If equilibrium conditions are maintained for accurate permeability determination, then reliable transmission rate data is obtained, but the stabilization process takes many hours
Solution Approach 1:
The patent applies preliminary action by pre-cooling the electrical conductivity probes to temperatures below that of the sample material before insertion. This preliminary temperature adjustment prevents condensation on the probes during measurement and ensures accurate electrical property detection from the start of the experiment, eliminating the need for lengthy equilibrium stabilization
Solution Approach 2:
The patent substitutes the equilibrium-based mechanical measurement approach with a dynamic electrical detection system that captures permeability information during the transient phase, eliminating the requirement for prolonged stabilization while maintaining data reliability through continuous electrical property monitoring
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 efficient and rapid determination of vapor transmission rates in minutes, suitable for thin materials, providing accurate kinetics data and adaptable to various environments, including high temperatures and pressures.
Implementation Method 1
Permeation can be explained to occur in a three-step process. Firstly, the permeant (e.g. gas or vapor) is absorbed into the material surface, referred to as 'sorption'. Secondly, the permeant diffuses into and through the polymer
Implementation Method 2
means for measuring the electrical properties of said sample at a second surface of said sample... determining the transmission rate of the fluid medium through the sample based on the recorded changes of electrical properties over time
Data Source
AI summary
The present invention relates to an arrangement for determining the permeability of a sample, said arrangement comprising a source of fluid medium arranged such that at least a fraction of said medium can be brought into contact with a first surface of said sample to be tested; means for measuring the electrical properties at a second surface of said sample, wherein the second surface is opposite said first surface of said sample; and a controller for recording said electrical properties, and for determining the transmission rate of the fluid medium through the sample based on the recorded electrical properties.