Testing apparatus for plastic airtightness and method thereof
A technology of air tightness testing and plastics, which can solve the problem of high cost by using liquid/vacuum degree for liquid tightness measurement, measuring the rate of increase and deceleration of fluid, instruments, etc., to reduce gas leakage and equipment investment , the effect of reducing system error
Active Publication Date: 2014-02-26
BEIJING UNIV OF CHEM TECH
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Problems solved by technology
These test devices based on the differential pressure method all have the same shortcoming: the test container is composed of a test gas chamber and a test chamber. The test gas chamber is provided with a high-pressure chamber, and the test chamber is provided with a low-pressure chamber. The gas in the low-pressure chamber is evacuated, and the cost is high, and the leakage of the low-pressure chamber directly affects the test results of the test device
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[0021] Such as figure 1 As shown, a plastic airtightness test device includes an air pump 1, a pressure reducing valve 17, an air filter 2, an air intake on-off valve 3, a high pressure pressure measuring element 4, a differential pressure measuring element 8, an air pipe 14, a test Chamber 12, reference chamber 13 and three-way ferrule ball valve 15. Test chamber 12 is composed of high pressure chamber 5, low pressure chamber 7, sealing ring 16, and plastic sample 6. Reference chamber 13 is composed of high pressure chamber 11, low pressure chamber 9, The sealing ring 16 and the reference iron sample 10 are composed of the test chamber 12 and the reference chamber 13 with the same structural size, and the two are compared with each other to reduce system errors; the air outlet of the air pump 1 is connected with the pressure reducing valve 17, the air filter 2, the air intake The on-off valve 3 and the high-pressure load cell 4 are connected through the air pipe 14. The press...
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The invention discloses a testing apparatus for plastic airtightness and a method thereof. The apparatus comprises an air pump, a pressure reducing valve, an air filter, an air inlet on-off valve, a high pressure element, a differential pressure measuring element, an air pipe, a testing chamber, a reference chamber and a three-way cutting sleeve ball valve. The testing chamber is composed of a high pressure chamber, a low pressure chamber, a sealing ring, and a plastic sample. The reference chamber consists of a high pressure chamber, a low pressure chamber, a sealing ring and a reference iron sheet sample. And the structural size of the testing chamber is identical with that of the reference chamber. According the above-mentioned technical scheme in the invention, the reference chamber is arranged and the size of the reference chamber is completely identical with that of the testing chamber, so that the two chambers can be contrasted and a system error can be reduced; besides, an initial testing pressure of the low pressure chamber is an atmospheric pressure, so that an occurrence of an air leakage phenomenon can be reduced; and there is no need for vacuum pumping, apparatus investment can be reduced, and energy can be saved.
Description
technical field [0001] The present invention relates to an airtightness measuring device and method for measuring the airtightness of, for example, plastic films, sheets, processed papers and the like. Background technique [0002] Due to the advantages of low cost, light weight and easy processing, flexible packaging materials such as plastic films and sheets are widely used in the packaging of various daily products such as food and medicine. According to the needs of different engineering applications, the barrier properties of flexible packaging materials such as plastic films and sheets are different. Sometimes a high barrier property against oxygen is required to prevent the intrusion of oxygen, and sometimes a low barrier property with good oxygen permeability is required. Facilitate the exchange of oxygen inside and outside the package. In order to better apply flexible packaging materials such as plastic films and sheets to different packaging industries, it is nec...
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Login to View More IPC IPC(8): G01M3/26G01N7/04
Inventor 杨卫民焦志伟姜鹏谢鹏程丁玉梅
Owner BEIJING UNIV OF CHEM TECH