Test method for water vapor barrier performance of PET plastic bottles for wine packaging

Abstract: high barrier materials are generally used in the packaging of alcohol products, such as poor moisture resistance, which is easy to cause changes in product concentration, fragrance loss and taste deterioration In this paper, the W3 / 230 water vapor transmission test system independently developed and manufactured by Labthink Languang is used to test the water vapor transmission of PET plastic bottle packaging, and the parameters, application scope and test process of the equipment are introduced, so as to provide a reference for the wine manufacturers to monitor the external water vapor barrier performance of PET plastic bottle packaging Key words: wine, plastic packaging, PET bottle, water vapor transmittance, moisture resistance, water vapor barrier, water vapor transmittance tester 1 China is one of the countries in the world where Zui made wine as early as 7000 It has been fermented and brewed for many years, and has been continuously improved and perfected Now it has developed to be able to produce all kinds of drinks with various concentrations, flavors and alcohol, and used for industrial, medical and health and scientific experiments With the development of wine industry and packaging industry, PET bottles have gradually entered the wine packaging market Ordinary PET bottles have been widely used in the packaging of cosmetics, medicine, health care, beverages, mineral water, engine oil and other products If PET bottles are used to package wine products, they need to have better barrier Take moisture resistance as an example, if PET bottles In order to improve the barrier performance of PET bottles, PET bottles are usually modified, such as by coating silica and amorphous carbon on the surface of PET bottles Therefore, it is necessary for wine manufacturers to test the moisture resistance of PET bottles before selecting and using them Fig 1 PET bottle for alcohol 2 Test standard the test method of water vapor transmission of domestic relevant container packaging is mainly infrared sensor test method, according to the national standard GB / T 31355-2014 test method of water vapor transmission of packages and containers Infrared sensor method, which specifies how to use infrared sensor method to test the water vapor permeability of packages and containers under steady-state conditions 3 Test sample PET plastic bottle packaging provided by an enterprise 4 The test equipment used in this paper is the W3 / 230 water vapor transmittance test system independently developed by Labthink Languang Fig 2 W3 / 230 water vapor transmittance test system 4.1 test principle W3 / 230 In this paper, the infrared sensor method is used to clamp the pre-treatment sample between the test chamber The nitrogen with stable relative humidity flows on one side of the film and the dry nitrogen flows on the other side of the film Due to the existence of humidity gradient, the water vapor will spread from the high humidity side to the low humidity side through the film On the low humidity side, the water vapor will be carried by the flowing dry nitrogen When the infrared sensor enters the sensor, it will produce electric signal of the same proportion Through the analysis and calculation of the electric signal of the sensor, the water vapor transmittance and other parameters of the sample can be obtained For packaging containers, dry nitrogen flows in the container and the outside of the container is in a high humidity state 4.2 scope of application (1) this equipment is applicable to the test of water vapor transmission of containers, films, sheets, paper, cardboard and composite materials Among them, containers include bottles, bags, cans, boxes and barrels made of plastic, rubber, paper, paper plastic composite, glass, metal and other materials, such as tea aluminum cans, coke bottles, peanut oil barrels, Tetra Pak packaging, vacuum packaging bags, metal packaging bags, metal three piece cans, plastic cosmetics hose packaging, toothpaste hose packaging, jelly cups, etc Film category includes various plastic films, paper plastic composite films, aluminized films, aluminum foil, aluminum foil composite films, glass fiber aluminum foil composite films, etc.; sheet category includes various engineering plastics, rubber, building materials and other sheet materials, such as PP sheets, PVC sheets, PVDC Sheet, etc.; paper, paperboard and its composite materials include paper, paperboard, etc., such as cigarette pack aluminum coated paper, paper aluminum plastic composite sheet, etc.; the equipment can also be extended to test the water vapor transmission rate of special packaging parts such as solar backboard, liquid crystal display film, pharmaceutical blister, pharmaceutical plastic bottle, sterile protective film, automobile oil tank, battery plastic shell, etc (2) the equipment complies with ISO 15106-2, ASTM f1249, GB / T 26253-2010, TAPPI t557, JIS k7129 4.3 equipment parameters: the conventional test range of thin film samples is 0.01-40 g / M 2 · 24h, which can be extended to 0.1-1000 g / m2 · 24h; the test range of container samples is 0.0001-0.2 g / PKG · D The temperature range of the test is 15 ℃ ~ 55 ℃, the temperature control accuracy is ± 0.1 ℃; the humidity range is 0% RH, 35% RH ~ 90% RH, 100% RH, and the humidity control accuracy is ± 1% RH Artificial, proportional and cyclic test modes provide suitable test methods for materials with different barrier properties The equipment is equipped with three test chambers, all of which can be designed independently, the test process is not interfered with each other, and the test results are displayed independently Support Lystem TM laboratory data sharing system, manage test results and test reports in a unified way 5 Test process (1) apply quick fix glue to the bottle mouth to fix it on the special container test tray device of the instrument After sealing, connect it to the instrument with pipeline, and then seal the sample and tray device with sealing bag (2) Set the sample name, test temperature, test humidity and other parameters (3) Adjust the nitrogen pressure to make the humidity in the test chamber reach the set value, and make the nitrogen flow in the upper and lower chambers reach the standard value through the nitrogen flow adjustment knob (4) Click the start test option to start the test The instrument automatically records the change of water molecular content in the low humidity side during the test, and calculates the final test results of Zui 6 Results the average value of water vapor transmittance of PET bottle was 0.0045 g / (PKG · 24 h) 7 Conclusion W3 / 230 water vapor transmission test system is a professional test equipment for measuring the water vapor barrier performance of containers, films and sheets against the outside world It has the advantages of high detection accuracy and good repeatability of test results, and can truly reflect the water vapor transmission of PET plastic bottles for wine packaging In addition to the detection of water vapor transmittance, we should also pay attention to the overall sealing performance of PET plastic bottle packaging and the opening force of the bottle cap Labthink Languang has always been committed to providing professional equipment and testing services for customers all over the world, and providing customers with a large number of performance data references for packaging materials Labthink is looking forward to technical exchanges and cooperation with users in various industries.