NewsInformation Center
Analysis of the film air permeability test using the fully automatic fabric air
2024/11/25
Share:
As we all know, flexible packaging materials such as plastic films and sheets have the advantages of low cost, lightweight, 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 requirements for flexible packaging materials such as plastic films and sheets are different. Sometimes high barrier properties are required to block oxygen to prevent the intrusion of oxygen, and sometimes low barrier properties with good oxygen permeability are required 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 packaged products.
At present, the methods for dealing with the air permeability test of plastic films include the pressure method (pressure difference method and equal pressure method), concentration method, volume method, gas chromatography method, and heat conduction method. According to different test methods, different types of plastic film air permeability test devices have been developed at home and abroad. Among them, the pressure difference method is the primary method in the air permeability test of plastic films. International film air permeability test standards based on the pressure difference 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. The fully automatic fabric air permeability meter is a test instrument, and Standard Group (Hong Kong) Co., Ltd. is the manufacturer. Customers with needs are welcome to inquire by phone.
Main parameters:
1. Pressure difference range: 0-4000Pa;
2. Measurable air permeability: 0.2-12826mm/s;
3. Measurement error: ≤±2%;
4. Measurable fabric thickness: ≤12mm;
5. Air suction volume adjustment: dynamic adjustment by data feedback;
6. Sample area setting circle: 5cm2, 20cm2, 50cm2, 100cm2;
7. Nozzles: 11 in total.
During the test, the vacuum pump draws 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. Conversely, the rougher the test results, the higher the barrier properties of the plastic film.
Under the condition of certain sealing materials and sealing technology, the key factor affecting the sealing performance of the test device is its sealing structure. Under the condition of certain temperature sensors, to make the temperature of the test environment meet the national standard requirements, appropriate constant temperature control technology needs to be adopted. At present, the permeability test device adopts a single-layer sealing structure, which has the advantage of a simple structure and the disadvantage of relatively large gas leakage, which will cause relatively large pressure changes. For the test of high barrier films, its sealing performance is difficult to meet the requirements of engineering applications.
The research status of the permeability test device based on the pressure difference method is analyzed, and several factors affecting the performance of the permeability test device are proposed. It is necessary to reasonably deal with the permeability test of high-barrier films. With the current vacuum technology and sealing technology capabilities, without sharply increasing the test cost, a permeability test device that meets the national standard requirements and can directly and accurately test high barrier films can be developed by changing the single sealing structure design and appropriate constant temperature control technology.
Previous: Textile vertical flammability tester children's pajamas ASTM D6545 test
N e x t : Analysis of thermal resistance and moisture resistance test of textile thermal r
