Abstract: The packaging of alcoholic products generally uses high barrier materials. For example, the moisture resistance is relatively poor, which may cause changes in product concentration, loss of flavor and poor taste. In this paper, the W3/230 water vapor transmission rate test system independently developed by Labthink is used to test the water vapor transmission rate of PET plastic bottle packaging, and introduces the parameters, application scope and test process of the equipment, thus producing alcohol. The enterprise monitors PET plastic bottle packaging to provide reference for the barrier performance of external water vapor.
Keywords: alcohol, plastic packaging, PET bottles, water vapor transmission rate, moisture resistance, water vapor barrier, water vapor transmission rate tester
1, meaning
China is one of the earliest countries in the world to brew wine. It has been fermented and brewed more than 7,000 years ago, and has been continuously improved and improved. Now it has been developed to produce various concentrations, various flavors and various beverages containing wine. And used for industrial, medical and scientific experiments. With the development of the wine industry and the packaging industry, PET bottles are now gradually entering the wine packaging market. Ordinary PET bottles have been widely used in the packaging of cosmetics, medicine, health care, beverages, mineral water, engine oil, etc. For packaging alcoholic products, PET bottles are required to have better barrier properties. For example, if the PET bottle is packaged in a high-humidity environment, the moisture resistance is too high, that is, the water vapor transmission rate is too high, which will seriously affect the wine. The taste of the product affects the brand image of the company. In order to improve the barrier properties of the PET bottle, the PET bottle is usually modified, such as by coating the surface of the PET bottle with silicon oxide or amorphous carbon. Therefore, before the selection and use of PET bottles, alcohol production enterprises are indispensable for testing their moisture resistance.
Figure 1 PET bottle for alcohol
2, testing standards
The domestic test method for water vapor transmission rate of container packaging is mainly infrared sensor detection method, according to the national standard GB/T 31355-2014 "Package and container water vapor permeability test method infrared method sensor method", this standard specifies How to use the infrared sensor method to test the water vapor permeability of packages and containers under steady state conditions.
3, test samples
PET plastic bottle packaging provided by a company.
4, test equipment
The test equipment used in this paper is the W3/230 water vapor transmission rate test system independently developed by Labthink.
Figure 2 W3/230 water vapor transmission rate test system
4.1 Principle of the test
The W3/230 uses the infrared sensor method to test the pre-treated sample between the test chambers. 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. In the presence of a gradient, water vapor diffuses from the high-humidity side through the membrane to the low-humidity side; on the low-humidity side, the permeated water vapor is carried by the flowing dry nitrogen gas to the infrared sensor, which produces the same proportion of electrical signals as it enters the sensor. Analyze and calculate the electrical signal of the sensor to obtain parameters such as the water vapor transmission rate of the sample. For packaging containers, dry nitrogen flows through the container and the outside of the container is in a high humidity state.
4.2 Scope of application
(1) This equipment is suitable for testing the water vapor transmission rate of packaging materials such as containers, films, sheets, paper, cardboard and composite materials.
Among them, containers include plastic, rubber, paper, paper-plastic composite, glass, metal and other materials, such as bottles, bags, cans, boxes, barrels, water vapor transmission rate test, such as tea aluminum cans, cola bottles, peanut oil barrels, Tetra Pak packaging, vacuum packaging bags, metal packaging bags, metal three-piece cans, plastic cosmetic hose packaging, toothpaste hose packaging, jelly cups, etc.
Films include various plastic films, paper-plastic composite films, aluminized films, aluminum foils, aluminum foil composite films, glass fiber aluminum foil composite films, etc.; sheet materials include various engineering plastics, rubber, building materials and other sheet materials, such as PP Sheet, PVC sheet, PVDC sheet, etc.; paper, paperboard and composite materials including paper, cardboard, etc., such as cigarette coated aluminum paper, paper aluminum-plastic composite sheet, etc.; the device can also be extended for solar back Test of water vapor transmission rate of special packaging materials such as board, liquid crystal display film, medical blister, pharmaceutical plastic bottle, sterile protective film, automobile fuel tank and battery plastic case.
(2) This device complies with ISO 15106-2, ASTM F1249, GB/T 26253-2010, TAPPI T557, and JIS K7129.
4.3 Equipment parameters
The conventional test range of the film sample is 0.01-40 g/m2·24h, which can be extended to 0.1-1000 g/m2·24h; the test range of the container sample is 0.0001-0.2 g/pkg·d.
The test temperature range is from 15 ° C to 55 ° C, the temperature control accuracy is ± 0.1 ° C; the humidity range is 0% RH, 35% RH ~ 90% RH, 100% RH, and the humidity control accuracy is ± 1% RH.
The three test modes of artificial, proportional and cyclic provide suitable detection methods for materials with different barrier properties.
The equipment is equipped with three test chambers, and the three test chambers can be designed independently. The test process does not interfere with each other, and the test results are displayed independently.
Support LystemTM laboratory data sharing system to unify test results and test reports
5, the test process
(1) Apply the quick-solid glue to the bottle mouth and fix it on the instrument-specific container test tray device. After the sealing is completed, connect it to the instrument by using the pipeline, and then use the sealed bag to carry the sample and the tray device. Seal the dressing.
(2) Set the sample name, test temperature, test humidity and other parameters.
(3) Adjust the pressure of the nitrogen gas so that the humidity in the test chamber reaches the set value, and the nitrogen flow rate adjustment knob is used to make the nitrogen flow rate in the upper and lower chambers reach the standard value.
(4) Click the Start Test option and the test begins. The instrument automatically records the change in water molecule content on the low-humid side during the test and calculates the final test results.
6, test results
The average water vapor transmission rate test for PET bottles in this paper is: 0.0045 g / (pkg · 24h).
7. Conclusion
W3/230 water vapor transmission rate test system is a testing equipment for container, film and sheet to test the external water vapor barrier performance. It has the advantages of high detection precision and good repeatability of test results, which can truly reflect alcohol packaging. Water vapor transmission rate of PET plastic bottles. In addition to the detection of water vapor transmission rate, attention should also be paid to the key concerns of the overall sealing performance and cap opening force of PET plastic bottle packaging. Labthink has been committed to providing professional equipment and testing services to customers around the world, providing customers with a large number of packaging material performance data references. For details, you can log in to view. Labthink is looking forward to technical exchanges and cooperation with users in various industries.
Foshan Qiaotai Furniture Products Co., Ltd. , https://www.qiaotaifurniture.com