Dynamic Moisture Permeability Evaluation for Multilayer Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional moisture permeability measurement apparatuses are unable to analyze the dynamic moisture permeability of multilayer films, such as polarizing plates, in a laminated state, and struggle to evaluate characteristics when water vapor concentration changes, limiting the analysis of moisture permeability in multilayer samples.
Innovation Solution
A dynamic moisture permeability evaluation apparatus that separates a measurement chamber into two spaces, using a test gas and carrier gas system to analyze the shift in water vapor concentration, allowing for waveform analysis and frequency-dependent evaluation of moisture accumulation and permeability in each layer of a sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional moisture permeation amount measuring apparatus is used, then moisture permeability of a sample can be measured, but it is impossible to analyze moisture permeability of each layer in a multilayer film in a laminated state
Solution Approach 1:
The measurement chamber is divided into multiple independent measurement spaces (first measurement space, second measurement space, etc.), each capable of measuring moisture permeability of individual layers. The multilayer film is sequentially positioned in each space to enable layer-by-layer analysis while maintaining the laminated structure's integrity
Solution Approach 2:
The invention transitions from measuring only the total moisture permeability of the multilayer film to analyzing moisture permeability in the layer dimension by introducing multiple measurement spaces that can independently evaluate each layer's characteristics while the film remains in its laminated state
2Measurement precision
If a conventional moisture permeation amount measuring apparatus is used, then moisture permeability can be measured, but it can only measure moisture permeability and not dynamic moisture permeability when water vapor concentration changes
Solution Approach 1:
The invention introduces a dynamic measurement capability by varying the water vapor concentration in the test atmosphere over time and measuring the corresponding changes in moisture permeability. This allows the system to evaluate how moisture permeability changes under different humidity conditions, providing dynamic rather than static measurements
Solution Approach 2:
The invention changes the water vapor concentration parameter in the test atmosphere to evaluate moisture permeability under different conditions. By controlling and varying this parameter, the system can analyze how moisture permeability responds to changing environmental conditions, enabling dynamic permeability assessment
3Measurement precision
If each layer of a multilayer film is individually measured using a moisture permeation amount measuring apparatus, then moisture permeability of each layer can be calculated, but the moisture permeability of each layer is different between single layer state and laminated state due to internal stress and interaction
Solution Approach 1:
The measurement system is segmented into multiple independent measurement spaces, each equipped to measure moisture permeability of individual layers while they remain in the laminated structure. This allows accurate measurement of each layer's contribution to the overall moisture permeability without disrupting the internal stress state
Solution Approach 2:
The invention creates a measurement system that replicates the actual usage conditions of the multilayer film by maintaining the laminated structure during measurement. This copying of the real-world state ensures that the measured moisture permeability values accurately reflect the film's performance in actual application
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 analysis of both the amount of moisture permeating and the ease of moisture accumulation in samples, allowing for detailed characterization of multilayer films and other samples, including those with changing water vapor concentrations.
Implementation Method 1
a measurement unit that measures a water vapor concentration in the carrier gas... capable of analyzing characteristics of a sample based on a shift in change of the water vapor concentration in the carrier gas from change of the water vapor concentration in the test gas
Implementation Method 2
a test gas adjustment system that changes a water vapor concentration in the test gas... capable of widely analyzing characteristics of a sample
Data Source
Figure 1~2
Figure 3~4
AI summary
A water vapor concentration in a test gas in a first space of a measurement space in which a sample is disposed is adjusted, and a water vapor concentration in a carrier gas in a second space separated from the first space by the sample is measured by a measurement unit. When the water vapor concentration in the test gas is changed, a shift B in change of the water vapor concentration in the carrier gas from the change of the water vapor concentration in the test gas is calculated. The calculated shift B in the change of the water vapor concentration in the carrier gas corresponds to ease of moisture accumulation in the sample. Thus, it is possible to analyze not only the amount of moisture permeating the sample but also the ease of moisture accumulation, so that characteristics of the sample can be widely analyzed.