As the basic material of soft plastic packaging, plastic film occupies a very large share in the packaging market, and has been widely used in food, medicine, chemical and other fields, among which food packaging accounts for the largest proportion, such as beverage packaging, quick-frozen food packaging, retort food packaging, fast food packaging, etc., these products have brought great convenience to people's lives. Therefore, the film is responsible for providing protection for the product as a package, and the barrier performance of the film is particularly important, and the company needs to detect and monitor it accordingly.
Film air permeability testerIt is a professional gas permeability testing instrument for thin film specimens, and the most common instrument in the industry isDifferential pressure gas permeameterThe instrument is based on the test principle of differential pressure method, and is suitable for the determination of gas permeability, solubility coefficient, diffusion coefficient and permeability coefficient of plastic films, composite films, high barrier materials, sheets and metal foils at various temperatures.
Thin Film Air Permeability Tester The test principle of the differential pressure gas permeability tester: the pre-treated specimen is placed between the upper and lower test chambers and clamped. The low-pressure chamber (lower chamber) is first vacuumed, and then the entire system is evacuatedWhen the specified vacuum degree is reached, the lower chamber of the test is closed, and the high-pressure chamber (upper chamber) is filled with a certain pressure of test gas, and a constant pressure difference (adjustable) is formed on both sides of the sampleIn this way, the gas will penetrate from the high-pressure side to the low-pressure side under the action of the differential pressure gradient, and the internal pressure of the low-pressure side will be monitored and processed to obtain the various barrier parameters of the tested sample.
Differential pressure permeameter equipment meets the following test standards: ISO 15105-1, ISO 2556, GB T 1038-2000, ASTM D1434, JIS K7126-1, YBB 00082003
Definition of the concept of gas permeation in the GB T 1038 test standard:
[Gas permeability].: The volume of gas per unit area of the specimen per unit time per unit time at a constant temperature and unit pressure difference when it is steadily permeated. It is expressed in volume values at standard temperature and pressure in cm3 m2·d·pa.
[Gas permeability coefficient].: The volume of gas per unit thickness and unit area of the sample per unit time under constant temperature and unit pressure difference when it is steadily permeable. It is expressed in volume values at standard temperature and pressure in cm3·cm cm2·s·pa.
Introduction to the application scope of instrument testing:
Film - suitable for the gas permeability test of various plastic films, plastic composite films, paper-plastic composite films, co-extrusion films, aluminized films, aluminum foils, aluminum foil composite films and other film materials.
Sheet - suitable for gas permeability testing of various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet, etc.
A wide range of different gases – suitable for transmittance testing of a wide range of gases, such as oxygen, carbon dioxide, nitrogen, air, helium, etc.
Biodegradable film – used to test the breathability of biodegradable film, such as starch biodegradable bag, etc.
Paper and cardboard - suitable for the air permeability test of composite materials such as paper and paper plastic, such as cigarette packs, aluminum foil, instant noodle paper bowls, disposable paper cups, etc.