Monitoring of internal moisture barrier properties of mask aluminum-plastic composite film
Abstract: The mask is used as a moisturizing whitening skin care product. The packaging used according to its own characteristics is not the same, mainly to prevent the loss of internal essence and moisture. Therefore, the detection of the water vapor barrier properties of the package should be strengthened. In this paper, the W3/330 water vapor transmission rate test system independently developed by Jinan Languang Electromechanical Technology Co., Ltd. is used to test the water vapor transmission rate of the mask aluminum-plastic composite film, and the parameters, application scope and test process of the equipment are detailed. This provides a reference for the mask manufacturing industry to verify that packaging materials block internal moisture.
Key words: mask, aluminum-plastic composite film, essence loss, moisture resistance, water vapor transmission rate, moisture barrier, water vapor transmission rate test system
1, meaning
The essence of the mask can be used to achieve special maintenance functions such as moisturizing, whitening, anti-aging, and balancing oils. Common masks are packaged in aluminum-plastic composite film, glass cans, plastic cans or plastic tubes. This paper introduces the monitoring scheme of the internal moisture barrier performance of the mask aluminum-plastic composite film packaging, and analyzes the barrier performance of the mask aluminum-plastic packaging. If the water vapor transmission rate of the package is large, that is, the moisture barrier property of the internal essence is poor, the moisture in the essence is easily lost, and the cosmetic effect such as moisturizing and moisturizing is lost, so the mask manufacturer should strengthen the mask packaging. Detection of water vapor barrier properties.
Figure 1 Common packaging for masks
2. Status
At present, the domestic test methods for water vapor transmission rate of soft plastic materials include weighing method (cup method), electrolysis method, humidity method and infrared method. The method standard that can be referred to is GB 1037-1988 "Plastic film and sheet" Water vapor permeability test method cup type method, GB/T 16928-1997 "Packaging material test method moisture permeability", GB/T 21529-2008 "Determination of water vapor transmission rate of plastic film and sheet - Electrolytic sensor method" , GB/T 30412-2013 "Plastics film and sheet water vapor transmission rate measurement humidity sensor method" and so on.
The standard on which this paper is based is GB/T 21529-2008 "Determination of Water Vapor Transmission Rate of Plastic Films and Sheets - Electrolytic Sensor Method".
3, test samples
Aluminium-plastic composite film used in a brand of mask.
4, test equipment
The test equipment used in this paper is the Labthink W3/330 water vapor transmission rate test system.
Figure 2 W3/330 water vapor transmission rate test system
4.1 Principle of the test
W3/330 adopts the principle of electrolytic sensor test. 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 humidity gradient, water vapor will diffuse through the film from the high wet side. On the low-humidity side, on the low-humidity side, the permeated water vapor is carried to the sensor by the flowing dry nitrogen gas, and the same proportion of electric signals are generated when entering the sensor, and the water vapor of the sample is obtained by analyzing and calculating the electrical signal of the sensor. Transmittance and other parameters. For packaging containers, dry nitrogen flows through the container and the outside of the container is in a high humidity state.
4.2 Equipment parameters
The conventional test range of film samples is 0.001 ~ 40 g / (m2 · 24h), can be extended to 0.01 ~ 1000 g / (m2 · 24h), the resolution is 0.001 g / (m2 · 24h); The test range is 0.0001 ~ 0.2 g / (pkg · 24h) with a resolution of 0.00001 g / (pkg · 24h).
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 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.
The system can support up to 10 instruments in parallel connection, and establish an efficient system for simultaneous testing of 30 samples.
Standard membranes are provided for system calibration to ensure the accuracy and versatility of the test data.
It can be combined with the oxygen transmission rate test system to form a hybrid test system, which is controlled by a computer to achieve an efficient and convenient test method for simultaneous testing of water vapor and oxygen transmission rate.
4.3 Scope of application
(1) This equipment is suitable for testing the water vapor transmission rate of packaging materials such as film, sheet, paper, cardboard and composite materials, containers and the like.
The film type includes various plastic film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum foil composite film, glass fiber aluminum foil paper composite film, etc.;
The sheet material includes various sheet materials such as engineering plastics, rubber, building materials, such as PP sheets, PVC sheets, PVDC sheets, etc.;
Paper, paperboard and composite materials include paper, cardboard, etc., such as cigarette coated aluminum paper, paper aluminum-plastic composite sheet, etc.;
The device can also be used for testing the water vapor transmission rate of special packages such as solar back panels, liquid crystal display films, medical blister packs, pharmaceutical plastic bottles, sterile protective film, automobile fuel tanks, and battery plastic casings.
The container class includes water vapor transmission rate test of bottles, bags, cans, boxes and barrels made of plastic, rubber, paper, paper-plastic composite, glass, metal, etc., such as Coke bottle, peanut oil drum, Tetra Pak packaging, vacuum Packaging bags, metal packaging bags, metal three-piece cans, plastic cosmetic hose packaging, toothpaste hose packaging, jelly cups, etc.
(2) This equipment complies with national and international standards such as GB/T 21529, ISO 15106-3, DIN 53122-2, YBB 00092003.
5, the test process
(1) Cut 3 pieces of 108 mm × 108 mm from the surface of the sample with a cutter.
(2) The aluminum foil faces of the three samples were directed to the high humidity test, clamped on the three test chambers of the instrument, and the test cavity was tightened.
(3) Set parameter information such as sample thickness, test temperature, and test humidity.
(4) 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.
(5) Click the Start Test option and the test begins. The instrument automatically records the change in moisture content on the low-humid side during the test and calculates the final test results.
6, test results
The water vapor transmission rate test values ​​of the three samples were 0.6365 g/(m2·24h), 0.6789 g/(m2·24h), and 0.7464 g/(m2·24h), respectively.
7. Conclusion
From the above test results, the water vapor transmission rate of the mask aluminum-plastic composite film package is low, indicating that the package has good moisture resistance and can meet the long shelf life requirement. W3/330 water vapor transmission rate test system is a professional testing equipment for film, sheet and container to the external water vapor barrier performance, with high detection accuracy and good repeatability of test results. As an excellent supplier of packaging testing equipment, Labthink is committed to providing professional, high-end packaging testing equipment and testing services to customers around the world. You can find out about the testing equipment and testing services. The more you understand, the more trust! Jinan Languang Electromechanical Technology Co., Ltd. is willing to enhance technical exchanges and cooperation with enterprises and institutions in the industry.
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