Complex films, multi-layer structures made from various materials, play a vital role in modern packaging. Their ability to impede gas transmission is crucial for maintaining product freshness and shelf life. However, accurately testing the gas barrier properties of these films presents unique challenges due to their layered construction.
Testing complex films is challenging. Firstly, the influence of Multi-layer. The layered structure of complex films can influence gas flow patterns within the material. This differs from single-layer films where gas transmission is more straightforward. Package edge leakage is another possible challenge. Unsealed edges on complex film specimens can become leakage points during testing. This compromises the accuracy of the test results by allowing gas to bypass the intended measurement path.
To overcome these challenges and ensure reliable test results, strict edge sealing of complex film specimens is paramount. This minimizes edge leakage and guarantees gas transmission occurs solely through the film itself.
Gas barrier property testers typically employ various methods to measure gas transmission rates through the film sample. Common methods include:
Differential Pressure Method: Measures the pressure difference across the film specimen as gas permeates through it.
Labthink VAC-V2 Gas Permeability Tester is based on the differential pressure method, and is professionally applicable to the determination of gas transmission rate as well as solubility coefficient, diffusion coefficient and permeability coefficient of plastic films, composite films, high barrier materials, sheeting and aluminum foils.
Electrochemical Detection: Utilizes sensors that detect specific gas molecules passing through the film.
C203H Oxygen Transmission Rate Test System is based on Coulometric oxygen analysis sensor and equal pressure test method, and is conforming to ASTM D 3985 and other standards. It provides high-precision and high-efficiency oxygen permeability tests for high gas barrier materials. During a test, Oxygen molecules are carried to the sensor. Through the analysis of the oxygen concentration measured by the sensor, the oxygen transmittance is calculated.
Gravimetric Method: Measures minute weight changes in the film specimen caused by gas permeation.
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C360M Water Vapor Transmission Rate Test System is designed and manufactured based on the gravimetric determination method and conforms to the requirements of ASTM E96. This instrument can be used to measure the water vapor transmission rate of barrier materials.
In conclusion, accurate gas barrier property testing of complex films is essential for optimizing packaging design and material selection. By employing proper edge sealing techniques and utilizing reliable testing instruments, manufacturers can ensure their complex films deliver the desired level of protection for packaged products. This not only leads to improved product quality and shelf life but also contributes to a more sustainable packaging industry by minimizing material waste.
As the demand for functional packaging materials grows, testing methods are evolving to ensure a more comprehensive evaluation of packaging films.
Labthink encourages collaboration with packaging industry companies for quality control! Visit the website www.labthink.com to learn more!
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