Automatic fabric air permeability tester to test film air permeability test analysis
As we all know, flexible packaging materials such as plastic films and sheets have the advantages of low cost, light weight and easy processing, and are widely used in the packaging of various daily products such as food and medicine. According to different engineering and application needs, the barrier properties of flexible packaging materials such as plastic films and sheets are different. Sometimes high barrier properties to block oxygen are required to prevent the intrusion of oxygen, and sometimes low barrier properties with better oxygen permeability are required. In order to facilitate the exchange of oxygen inside and outside the package. The air permeability of flexible packaging materials such as plastic films and sheets directly affects the quality of their packaging products. At present, there are pressure method (differential pressure method and equal pressure method), concentration method, volume method, gas chromatography method and heat conduction method to deal with the air permeability test of plastic film. According to different test methods, different types of plastic film air permeability test devices have been developed at home and abroad. Among them, the differential pressure method is the primary method in the air permeability test of plastic films. The international air permeability test standards based on the differential pressure method include ASTM D1434, ISO15105-1, ISO 2556-2001, JIS K7126, etc. The standards implemented in my country are GB/T1038-2000, GB/T 5453-1997, etc., fully automatic The fabric air permeability tester is a test instrument, and (Hong Kong) Co., Ltd. is the manufacturer. Customers in need are welcome to inquire. Main parameters: 1. Differential pressure range: 0～4000Pa; 2. Measurable air permeability: 0.2—12826mm/s; 3. Measurement error:≤±2%; 4. Measurable fabric thickness:≤12mm; 5. Suction volume adjustment: dynamic adjustment by data feedback; 6. Sample area setting circle: 5cm2, 20cm2, 50cm2, 100cm2; 7. Nozzle: 11 in total. During the test, the vacuum pump will pump the vacuum on the low pressure side of the test device to below 27Pa. The leakage of the system has a great influence on the test results. The smaller the leakage, the more accurate the test results. On the contrary, the rougher the test results, the higher the barrier property of the plastic film. Under certain conditions of sealing material and sealing technology, the key factor affecting the sealing performance of the test device is its sealing structure. In the case of a certain temperature sensor, in order to make the temperature of the test environment meet the requirements of the national standard, it is necessary to adopt a suitable constant temperature control technology. At present, the air permeability test device adopts a single-layer sealing structure. Reach engineering application requirements. The research status of the air permeability test device based on the differential pressure method is analyzed, and several factors affecting the performance of the air permeability test device are proposed. With the current vacuum technology and sealing technology capabilities, the test cost can not be drastically increased. By changing the single-sealing structure design and appropriate constant temperature control technology, it is possible to develop a test device that meets the requirements of the national standard and can directly and accurately test the high-barrier film air permeability test device.
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