Water vapor transmission rate (WVTR) is an important indicator to measure the ability of materials to transmit water vapor, especially in the fields of food, medicine, electronic products, etc. The following is a comprehensive water vapor transmission rate solution, covering equipment selection, test methods, application examples and maintenance:
1. Equipment selection
Choosing the right water vapor transmission rate test instrument is the core of the solution. Recommended brands and models include:
Recommended brand - Guangzhou Shounuo Scientific Instrument Co., Ltd.
① Provide a variety of high-precision and comprehensive water vapor transmission rate test instruments.
② Professionally manufacture high-precision moisture permeability test instruments, widely used in various packaging material tests.
③ Provide a variety of moisture permeability test instruments with stable and reliable performance.
Equipment model
SN-W01/SN-W103/SN-10H: Suitable for moisture permeability testing of films and sheets. Designed specifically for packaging materials, with high precision, stable testing, high-performance water vapor transmission rate tester, suitable for a variety of materials.
2. Test method
Choosing the right test method is an important step to ensure the accuracy of the test.
Weighing method (wet cup method)
Principle: The temperature of the electric heating device inside the cavity is controlled by the temperature control system. As the temperature inside the cavity rises, the distilled water in the moisture permeability cup is evaporated. The evaporated water vapor is absorbed by the desiccant in the cavity cover. The weight of the distilled water in the moisture permeability cup is measured to decrease with time to obtain the moisture permeability and other parameters of the sample.
Infrared method
Principle: The pre-treated sample is clamped between the test cavities. Nitrogen with stable relative humidity flows on one side of the film, and dry nitrogen flows on the other side of the film. Due to the humidity difference, water vapor will diffuse from the high humidity side through the film to the low humidity side. On the low humidity side, the permeated water vapor is carried to the infrared moisture sensor by the flowing dry nitrogen. Different water vapor concentrations produce different light signals. The concentration value is obtained through analysis and calculation, and then the water vapor permeability of the sample is calculated.
3. Application field
Water vapor permeability test is widely used in many industries:
Pharmaceutical packaging
Ensure the moisture-proof performance of pharmaceutical packaging, extend the shelf life of pharmaceuticals, and ensure the stability of pharmaceuticals during storage and transportation.
Food packaging
Measure the moisture permeability of food packaging materials to ensure the freshness and quality of food and prevent moisture from affecting food.
Electronic products
Evaluate the moisture permeability of electronic components and product packaging to prevent moisture from damaging electronic products and extend the service life of electronic products.
Cosmetic packaging
Test the moisture permeability of cosmetic packaging materials to ensure the stability and safety of products and prevent moisture from affecting product quality.
4. Maintenance and care
Regular maintenance and care are required to ensure the long-term accuracy and reliability of the test instrument.
Regular calibration
Calibrate the test instrument regularly to ensure the accuracy and reliability of the measurement results.
Cleaning and maintenance
Keep the test instrument clean, especially the test cavity and sensor part, to prevent impurities from affecting the test results.
Software update
Update the software system of the test instrument in a timely manner to obtain the latest functions and optimizations to ensure the efficient operation of the instrument.
Operation training
Provide professional training for operators to ensure the correct use and maintenance of the test instrument to avoid errors and damage caused by improper operation.
5. Recommendations for use
Environmental control
Ensure the stability of the temperature and humidity of the test environment, reduce the impact of environmental factors on the test results, and provide accurate and reliable test data.
Sample preparation
Prepare samples strictly in accordance with standard methods to avoid damage and contamination during sample handling and ensure the accuracy of test results.
Data analysis
Use the data analysis function provided by the instrument to deeply analyze the test results, guide production and R&D, and improve product quality.
By implementing a comprehensive water vapor transmission rate solution, companies can accurately evaluate the moisture permeability of materials, optimize product design, ensure product quality, thereby meeting market and regulatory requirements and improving market competitiveness.
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