Abstract: Aluminized BOPP tape has certain functions of heat preservation, heat insulation and moisture resistance. To ensure that the product is not affected by moisture in the environment, the detection of water vapor barrier properties of aluminized BOPP tape should be strengthened. In this paper, the W3/062 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 aluminized BOPP tape samples, and the parameters, application scope and test process of the equipment are detailed. It provides a reference for monitoring the moisture resistance of aluminum-plated BOPP tape related industries.
Key words: tape, aluminized BOPP tape, water vapor barrier properties, moisture barrier, water vapor transmission rate, water vapor transmission rate test system
1, meaning
Aluminized BOPP tape is an ideal protective layer for a new generation of insulation, heat insulation and soundproof building materials. It can partially replace aluminum foil tape, used for outer wrapping materials for insulation layers such as heating and cooling equipment, pipes, and insulation and sound insulation for roofing. Moisture, mildew, anti-corrosion, etc. of materials and equipment. The water vapor barrier performance is an important factor affecting whether the aluminized BOPP tape can meet the above-mentioned uses. For example, if the equipment is protected from moisture and mildew, if the aluminum-plated BOPP tape has a large water vapor transmission rate, that is, water in the environment. If the vapor barrier property is poor, more water vapor will penetrate into the inside of the tape, causing corrosion and mildew due to the contact with the water. Therefore, the water vapor barrier performance of the aluminized BOPP tape is one of the performances that should be monitored by relevant companies. This paper analyzes the water vapor transmission rate of the aluminized BOPP tape to analyze its barrier properties against water vapor.
Figure 1 Aluminized BOPP tape
2. Status
At present, the test methods for water vapor transmission rate of materials mainly include cup method, electrolysis method, infrared method and humidity method. Among them, cup method is divided into weight gain method and weight loss method. This paper is based on the weighting method specified in GB/T 15331-1994 "Test method for water vapor transmission rate of pressure-sensitive adhesive tape".
3, test samples
A brand of aluminized BOPP tape.
4. Test equipment
The equipment used in this test is the W3/062 water vapor transmission rate test system, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 W3/062 Water Vapor Transmission Rate Test System
4.1 Principle of the test
The weight gain method calculates the water vapor transmission rate of the sample based on the increase in the weight of the moisture permeable cup. The specific realization process is that a desiccant is placed in the moisture permeable cup, the sample is sealed at the mouth of the moisture permeable cup, and the humidity in the test chamber of the device is controlled, so that a certain humidity difference is formed on both sides of the sample, and the water vapor passes through the test chamber. The sample penetrates into the moisture permeable cup to provide power. The water vapor permeating into the moisture permeable cup is absorbed by the desiccant, thereby causing a change in the weight of the moisture permeable cup, and the water vapor transmission rate of the sample is obtained by testing the increase in the weight of the moisture permeable cup over time.
4.2 Scope of application
(1) This equipment is suitable for water vapor transmission rate testing of various types of materials, such as pressure sensitive adhesive tape, plastic film, paper-plastic composite film, geomembrane, aluminized film, aluminum-plastic composite film, waterproof and breathable film, etc. Materials, PP sheets, PVC sheets, PVDC sheets and other engineering plastics, rubber, building materials and other sheet materials, cigarettes, aluminum foil, Tetra Pak and other paper, cardboard materials, waterproof and breathable fabrics, diapers Materials such as textiles and non-woven fabrics for materials and sanitary products. In addition, it can be extended to the moisture permeability, water resistance and moisture retention test of artificial skin, medical supplies and accessories, solar back panels, liquid crystal display films, paint films, cosmetics, biodegradable films and other materials and products.
(2) This equipment meets many national and international standards, such as GB/T 15331, GB 1037, GB/T 16928, ASTM E96, ASTM D1653, TAPPI T464, ISO 2528, DIN 53122-1, JIS Z0208, YBB 00092003, etc. .
4.3 Equipment parameters
Two test modes of weight gain method and weight loss method can be realized.
The weighting method test range is 0.1 ~ 2500 g / (m2 · 24h), the weight loss method test range is 0.1 ~ 10000 g / (m2 · 24h), the test accuracy is 0.01 g / (m2 · 24h), the system resolution is 0.001 g.
Automatic temperature and humidity control, wide range, high precision, temperature control range is 15 ~ 55 °C, temperature control accuracy is ±0.1 °C, weight loss method is 70 ~ 90% RH, weight gain method is controlled to 10 ~ 98% RH, humidity control accuracy of ±1% RH, can achieve water vapor transmission rate test under different temperature and humidity conditions
Purge wind speed ranges from 0.5 to 2.5 m/s
The sample size is Ф74 mm and the test area is 33 cm2.
The system automatically weighs intermittently, and the system automatically clears each time before weighing.
The test chamber can accommodate 6 moisture permeable cups, each of which can be tested independently, and 6 identical or different samples can be tested simultaneously.
Support for the LystemTM laboratory data sharing system.
5. Test process
(1) Three specimens with a diameter of 74 mm were cut from the surface of the aluminized BOPP tape sample.
(2) A certain amount of dried anhydrous calcium chloride was placed in the moisture permeable cup as a desiccant, and the cut three samples were sealed on three moisture permeable cups each containing a desiccant.
(3) Place the moisture permeable cups with the sample specimens on the moisture permeable cup holder in the test chamber of the equipment and close the test chamber door.
(4) In the system software section, set the sample thickness, test temperature and humidity (38 ° C, 90% RH), test time interval and other parameter information, click the test option, the test begins. The device automatically tests the weight of the moisture permeable cup at set intervals, and calculates and displays the test results of the water vapor transmission rate of the sample based on the test data.
6, test results
The water vapor transmission rate test values of the three samples were 3.4478 g/(m2·24h), 3.4215 g/(m2·24h), and 3.4589 g/(m2·24h), respectively.
7. Conclusion
The whole test process is simple and the equipment is highly intelligent. From the above test results, the uniformity of the water vapor transmission rate test results of the aluminized BOPP tape samples is good, indicating that the moisture resistance of each part of the sample is uniform. W3/062 Water Vapor Transmission Rate Test System is a testing equipment for testing the barrier properties of film and sheet to external water vapor. It takes both weight gain method and weight loss method as test methods with high detection accuracy and repeated test results. Goodness and other advantages. As an excellent supplier of packaging inspection equipment, Labthink is committed to providing professional, high-end packaging inspection equipment and testing services to customers around the world. For information on related equipment and services, you can log in to view. 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.
