The bubble bag is mainly made of low density polyethylene. There are many small bubbles on the surface. Each contains a certain gas in the foam, which will be buffered by external impact or extrusion. Therefore, bubble bags, such as functional shocks, wear-resistant, sound insulation, commonly used in electronics, precision instruments, ceramics, handicrafts, household appliances, distributors, kitchen, furniture, hardware tools, glass. Products, such as shock cushioning, protective packaging, etc.
Precision products, such as electronic products and instruments, are more sensitive to water vapor. Contact with water vapor will result in dampness, performance degradation and even scrap. The moisture-proof level is an important factor affecting the water vapor content in the environment. Water vapor permeability is an index to evaluate the moisture resistance of bubble bag.
Testing Basis and Instruments
At present, there are mainly 4 kinds of testing methods for water vapor transmittance of plastic materials, namely, cup type, electrochemical sensor, infrared sensor and humidity sensor. In order to prevent bubbles from being extruded, keep the original characteristics of bubble bags as far as possible. In this paper, the principle of sample test is adopted, and the test method of permeability of plastic film and sheet is carried out according to GB 1037-1988 standard. Cupping method.
The test equipment used in this experiment is the w3/030 water vapor transmittance tester independently developed by Labthin Blue Light.
Test sample: White transparent bubble bag was used as test sample to test its moisture resistance.
The samples with diameter of 74 mm were cut off from the surface of the sample and sandwiched in three moisture permeable cups separately. The appropriate amount of distilled water was added.
Put the moisture permeable glass frame on the equipment and close the door of the test room.
Set the parameters such as sample name, test temperature, test humidity, test mode and so on. Click on the test options. The equipment will test according to the set parameters. After the test, the water vapor transmittance test value of the sample will be automatically displayed.
Test results and analysis
The average water vapor permeability of bubble bag samples was 13.913 g/(m2.24h).
Bubble bag as a protective packaging of products, its good moisture-proof performance can make products in low humidity environment, effectively prevent products from dampness. Based on the principle of w3/030 water-gas transmittance tester, this paper tests the water-gas transmittance of the sample of the bubble bag. The test procedure is simple, the equipment is easy to operate, and the degree of intelligence is high. It can accurately reflect the moisture resistance of the bubble bag.
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