Air bubble pouch mostly made of low density polyethylene as raw material, the surface has many small bubbles, each bubble contains a certain amount of gas, when hit by external force or squeeze, these gases will play a cushioning role, so air bubble bag has a shockproof, anti-wear, sound insulation, etc., commonly used in electronics, precision instruments and meters, ceramics, handicrafts, household appliances, the Bicycle line, kitchen, furniture, hardware tools, glass products and other shock-resistant cushioning, protection packaging.
Electronic products, instruments and other precision products are more sensitive to water vapour, contact with more water vapour will lead to moisture in the product and cause performance degradation, or even scrap, air bubble bag as a protective packaging for the above products, its moisture resistance is an important factor affecting the water vapour content of the environment in which the product is located.
Water vapour transmission rate is the evaluation of air bubble bag moisture performance indicators, this paper targeted testing of air bubble pouch samples of water vapour transmission rate.
At present, the water vapor transmission rate of plastic materials, there are four main testing methods, respectively, the cup method, electrolysis sensor method, infrared sensor method, humidity sensor method, in order to prevent the bubble in the sample is squeezed and destroyed, try to maintain the original appearance of air bubble bag.
This paper uses the principle of the cup method to test the water vapour transmission rate of the sample, the test is based on the standard GB 1037-1988 "plastic film and sheet water vapour permeability test method cup method".
Air bubble bag test procedure
1, test sample: this test to white transparent air bubble bag as a test sample, test its moisture resistance.
2, the test process.
(1) from the surface of the sample cut the diameter of 74 mm specimen 3 pieces, and were clamped in 3 has been poured into an appropriate amount of distilled water permeable cup.
(2) Place the permeable on the equipment's permeable cup holder and close the test chamber door.
(3) Set the specimen name, test temperature, test humidity, test mode and other parameter information, click on the test option, the equipment in accordance with the set parameters for testing, and automatically display the water vapour transmission rate test value of the specimen at the end of the test.
The average water vapour transmission rate of the tested bubble bag samples is 13.913 g/(m2-24h).
Bubble bags as a protective packaging, its good moisture resistance can make the product in a lower humidity environment, effectively prevent the product from moisture.
This paper is based on the principle of the cup method equipment - W3/030 water vapour transmission rate tester to test the water vapour transmission rate of air bubble bag samples, the test procedure is simple, the equipment is easy to operate, the degree of intelligence is high, can accurately reflect the moisture resistance of the bubble bag.