Abstract: Soy sauce is a traditional Chinese condiment. It is often filled in plastic bags or bottles. The overall sealing performance of the package is important for its shelf life. In this paper, Labthink MFY-01 sealing tester is used to test the overall sealing performance of soy sauce PE black and white film packaging, and the basic process and test principle of the test are introduced, which helps food enterprises to effectively solve the quality problems such as product leakage and deterioration and the production process. Technical questions about parameter settings. Key words: seasoning, soy sauce, sealing performance, finished product packaging, leakage, seal tester, negative pressure sealer 1, meaning The raw material of soy sauce is plant protein and starch, so the soy sauce is mildewed, especially in the cold and cool environment in summer. In addition to plastic or glass bottles and barrels, soy sauce is also available in plastic bags. This paper takes the soy sauce PE black and white film packaging as an example to analyze the overall sealing problem of the package. The sealing property of the packaging refers to the reliability of the sealing of the packaging bag. If the sealing of the soy sauce packaging is poor, the liquid leakage and damage of the packaging during the circulation and storage process may cause the moldy mildew and the taste of the soy sauce to deteriorate. During the shelf life, the sealing performance of the product must be guaranteed to reduce the large risks and economic losses that the enterprise suffers from the packaging sealing problem. Figure 1 Soy sauce plastic bag packaging 2, the implementation of standards The domestic testing standards for packaging sealing performance are mainly GB/T 15171-1994 "Test method for sealing performance of flexible packaging parts". 3, test samples The finished soy sauce plastic packaging bag provided by a food factory. 4, test equipment Jinan Languang Electromechanical Technology Co., Ltd. independently developed the MFY-01 seal tester. Figure 2 MFY-01 seal tester 4.1 Principle of the test By vacuuming the vacuum chamber of the equipment, the sample immersed in the vacuum chamber is subjected to internal and external pressure difference, and the sample is inspected for leaking condition to judge the sealing performance of the sample; or by vacuuming the vacuum chamber, The sample is subjected to a pressure difference between the inside and the outside, and the sealing performance of the sample is judged by observing the expansion of the sample and the recovery of the shape of the sample after the vacuum is released. 4.2 Scope of application Applicable to the overall sealing test of plastic bags, bottles, tubes, cans, boxes, etc. Applicable to the overall sealing test of glass bottles, tubes, tanks, boxes, etc. Applicable to the overall sealing test of metal bottles, tubes, tanks, boxes, etc. It is suitable for the sealing test of paper-plastic composite bags and box packaging. It meets the requirements of national standard GB/T 15171 and American standard ASTM D 3078. 4.3 Equipment parameters The degree of vacuum is 0 ~ -90 KPa. The effective size of the vacuum chamber is available in three options: 270 mm (diameter) × 210 mm (height), 360 mm (diameter) × 585 mm (height), 460 mm (diameter) × 330 mm (height). 5, the test process (1) Immerse the sample in water in a vacuum chamber. (2) Cover the sealing cover and set the vacuum pressure parameters and holding time to be achieved. (3) Turn on the vacuum pump, start vacuuming, press the start button on the device, and the test starts. (4) Observe whether or not continuous bubbles are generated on the surface of the package during vacuuming or during pressure holding. 6, test results The sealing performance test results of the three finished bags of soy sauce were: - No leakage at -90 KPa. 7. Conclusion From the above results, the soy sauce PE black and white film package tested has better overall sealing performance. The MFY-01 seal tester is used for the sealing performance test of finished products. It is easy to operate, short in time, high in efficiency, reduces the error of human operation, and can accurately reflect the sealing performance of soy sauce. In addition, it is necessary to strengthen the detection performance, heat seal strength, tensile strength and pendulum impact energy of soy sauce bags. You can check the related testing equipment. Labthink has been committed to providing professional testing services and equipment to customers around the world, focusing on solving difficult problems in packaging for customers. It provides testing services for customers in the fields of food, chemical, automotive, pharmaceutical and building materials. Up to 10,000 times. The more you understand, the more trust! 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March 17, 2023