Source：Link Testing Instruments Co.,ltd
Aluminized paper is mainly composed of base paper, aluminized layer and coating. Because of its good gloss and smoothness, good flexibility, it has certain barrier properties, and the aluminized layer has high composite fastness, beautiful and environmentally friendly, and has good printing. Performance and mechanical processing performance, so it can be widely used in the exquisite packaging of tobacco, wine, bottle stickers, tea, food, cosmetics, daily chemicals, department stores, gifts, handicrafts and other products, and can also be used as building decoration materials.
Tobacco needs to be stored and sold in a dry environment, so aluminized paper provides a higher water vapor barrier performance, that is, a lower water vapor transmission rate, which ensures a dry environment for tobacco. The use of aluminized paper not only reduces the tendency of tobacco to be damp and moldy in high-humidity environments, reduces the risk of changes in tobacco quality and taste, but also extends the shelf life of tobacco. Therefore, tobacco manufacturers should strictly control the barrier properties of aluminized cigarette packs to water vapor.
Test method and instrument
Domestic testing methods for water vapor barrier properties of composite film and sheet packaging include weighing method (cup method), electrolysis method, infrared method and humidity method. The reference method standards are GB 1037 "Plastic Film and Sheet Water Vapor Permeability" Standard Test Method "Cup Method", GB/T 21529 "Plastic Film and Sheet Water Vapor Transmission Rate Determination by Electrolytic Sensor Method", GB/T 26253 "Plastic Film and Sheet Water Vapor Transmission Rate Determination by Infrared Detector Method" , GB/T30412 "Plastic Film and Sheet Water Vapor Transmission Rate Determination of Humidity Sensor Method", the reference standard in this article is GB1037 "Plastic Film and Sheet Water Vapor Permeability Test Method Cup Method".
This test uses the LTWPT-304 water vapor transmission rate tester independently developed and designed by Link Testing Instruments Co., Ltd.
Test principle: LTWPT-304 adopts the vapor-permeable cup weighing method to test the principle. At a certain temperature, a specific humidity difference is formed on both sides of the sample, and water vapor penetrates the sample in the vapor-permeable cup into the dry side , Determine the water vapor transmission rate and other parameters of the sample by measuring the change in the weight of the moisture-permeable cup over time.
Test sample and test process
Test sample: Aluminized paper sample of cigarette pack used by a certain tobacco brand.
(1) Use a sampler to cut 3 specimens with a diameter of 74mm from the sample for testing.
(2) Install the samples on the three moisture-permeable cups, and then close the glass sealing door.
(3) Set parameters such as sample name, sample thickness, test temperature, and test humidity.
(4) Start the gas source and click the "Start Test" option.
(5) After the test is over, the instrument automatically calculates and displays the test result.
Test results and analysis
The water vapor transmission rates of the aluminum-coated cigarette pack paper samples tested this time are: 21.2146 g/(m2·24h), 22.1207g/(m2·24h), 22.4576 g/(m2·24h).
The water vapor transmission rate of the aluminum-plated cigarette pack paper tested this time is relatively good, which can meet the storage, sales and circulation links of tobacco under normal conditions. The LTWPT-304 water vapor transmission rate test system is a professional instrument for testing the water vapor transmission rate of packaging materials such as films, papers, sheets, etc. The equipment is simple to operate, has high test accuracy, and good repeatability, and can accurately reflect smoke. Moisture resistance of aluminized paper.
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