Method for testing carbon dioxide permeability of nano-preservative film
Abstract: The permeability of carbon dioxide is one of the important performance indicators of cling film materials. In this paper , the carbon dioxide permeation of nano-preservative film was tested by the differential pressure method VAC-VBS differential pressure gas permeation instrument, and the plastic film material was carbon dioxide-permeable through the introduction of the test principle, equipment parameters, application range and test process. Provide a reference for performance testing and research. Key words: carbon dioxide permeation, carbon dioxide permeability, differential pressure gas permeation instrument, nano-preservative film 1 , meaning Nano-preservative film refers to a film material that can be used for food preservation of fruits, vegetables, meat products, fresh milk, beer, cooked food, etc. by synthesis, modification and addition on a nanometer size. Compared with ordinary fresh-keeping materials, nano-wrap film has obvious advantages in heat resistance, antibacterial property and anti-corrosion. The cling film should have appropriate performance parameters depending on the characteristics of the packaged food. Among them, the permeability (barrier) performance of gas is an important reference index for determining whether the nano-wrap film can produce a good fresh-keeping effect on the packaged food. For example, when packaging fresh fruits and vegetables, the wrap film should have appropriate oxygen and carbon dioxide permeability. Performance to adapt and limit the respiration of fruits and vegetables. This paper specifically tests the carbon dioxide permeation of nano-preservative films. 2 , test samples Nano wrap film. 3 , the test basis At present, the test method of carbon dioxide permeation mainly adopts the principle of differential pressure method, and the test process is based on the standard GB/T 1038-2000 "Plastic film and sheet gas permeability test method differential pressure method". 4 , test equipment In this test , the nano-preservative film samples were tested by VAC-VBS differential pressure gas permeation instrument. The equipment was independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd. Figure 1 VAC-VBS differential pressure gas permeation meter 4.1 Test principle The principle of differential pressure method is to maintain a certain pressure difference on both sides of the sample during the test. After the sample is clamped to the test chamber of the device, the test chamber is divided into upper and lower chambers, the upper chamber is filled with a certain pressure of test gas carbon dioxide, and the lower chamber is vacuumed to form a low pressure environment, such a sample A certain pressure difference is formed on both sides. During the test, the carbon dioxide in the upper chamber is slowly infiltrated into the lower chamber by the upper chamber through the sample, which causes the lower chamber pressure to rise. When the stable penetration is reached, the pressure and penetration time in the lower chamber. In a linear relationship, based on this linear relationship, the carbon dioxide transmission rate of the sample can be calculated. 4.2 Scope of application (1) This equipment is suitable for gas permeability testing of various films and sheets. Films include various plastic film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum foil composite film and other film-like materials; sheet materials include various engineering plastics, rubber, building materials and other sheet materials, such as PP Sheet, PVC sheet, PVDC sheet. (2) This equipment can also be extended to aerospace materials, paper and paperboard, paint film, fiberglass cloth, glass fiber paper, cosmetic hose sheets, various rubber sheets and other materials for gas permeability testing. (3) This equipment is suitable for the permeability test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air, etc. (4) The number of devices to meet national and international standards, such as ISO15105-1, ISO2556, GB / T 1038 , ASTM D1434, JIS K7126-1, YBB00082003. 4.3 Equipment parameters The test range is 0.1 ~ 100,000 cm 3 /(m 2 ·24h·0.1MPa) ; the test of 3 samples can be completed at the same time . The test result is the average value of the test results of 3 samples; the temperature range of the sample is 15 ~ 55 °C , temperature control accuracy is ±0.1 °C ; standard film is provided for rapid calibration to ensure the accuracy and versatility of the test data; support Lystem TM laboratory data sharing system, unified management test results and test reports. 5 , the test process (1) Three pieces of a sample having a diameter of 97 mm were cut from the surface of the nano-film wrap film to be tested . (2) applying a layer of vacuum grease in the test chamber 3 surrounding the device, a filter paper were placed in the test area, the three samples were attached to the test chamber, and gently pressed between the bubbles and the sample test chamber is removed Then clamp with the clamping device. (3) Connect the carbon dioxide gas source, set the sample name, test temperature, humidity, test mode, vacuum time and other parameter information on the equipment control software. Click the test option to open the vacuum pump and the test starts. (4) The equipment is automatically tested according to the set parameters. After the test is completed, the test results are displayed. 6 , test results The carbon dioxide permeation amount of the nano-wrap film sample tested in this test was 3.9046×10 4 cm 3 /(m 2 ·24h·0.1MPa) . 7 , conclusion The effect of nano-preservative film on carbon dioxide permeability is an important factor affecting the fresh-keeping effect of fresh fruits and vegetables. The high carbon dioxide transmission rate is beneficial to delay the aging of fruits and vegetables, is conducive to the maintenance of nutrients and color, and ensures good fruits and vegetables. Storage quality. In this paper, the carbon dioxide permeation of nano-preservative film samples is tested by differential pressure method. The test process is simple, the equipment is easy to operate, the degree of intelligence is high, the test results are accurate and reliable, and the test efficiency is high. In addition to carbon dioxide, the principle equipment can also be used. Testing of gas permeation properties of oxygen, nitrogen, air, sulfur hexafluoride, helium, etc. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging testing services for packaging testing equipment. The existing equipment can test almost all kinds of performance indicators of soft plastic packaging materials . The more you understand, the more trust you have, Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry! Fire Telephone,Fire Telephone Jack Socket,Fire Fighting Telephone,Fire Alarm Telephone LIAONING YINGKOU TIANCHENG FIRE PROTECTION EQUIPMENT CO.,LTD , https://www.tcfiretech.com