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    Home > Active Ingredient News > Drugs Articles > Introduction to the test method of rubbing resistance of flexible packaging materials

    Introduction to the test method of rubbing resistance of flexible packaging materials

    • Last Update: 2018-05-31
    • Source: Internet
    • Author: User
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    Abstract: kneading resistance is an important factor that affects the performance of packaging materials This paper systematically introduces the test method for kneading resistance of flexible materials based on ASTM f392 standard, including kneading process, kneading mode, verification method, etc., and summarizes and analyzes the use of fdt-02 by Labthink blue light The test results of the kneading resistance of packaging materials by kneading tester can provide methods and data reference for the test and quality control of the kneading resistance of flexible materials Key words: packaging materials, flexible materials, rubbing resistance, ASTM f392, rubbing tester, barrier, turpentine method In the process of bag making, packaging, transportation, storage and sales of packaging materials, it is inevitable to be kneaded by external forces, such as wrinkles on the surface of vacuum packaging, creases on the bottom or both sides of the self-supporting bag, and bends around the inflatable packaging bag If the packaging materials have poor kneading resistance, the surface of the bag will be kneaded The materials in the rubbing part are easy to be damaged, pinholes and cracks appear in one or even several layers of the composite film, which affects the barrier performance and sealing performance of the finished product packaging Therefore, excellent kneading resistance is one of the important conditions to ensure that the packaging materials always have a good protective effect on the packaged products Figure 1 example of kneading phenomenon on packaging surface at present, there is no method standard related to kneading of packaging materials published in China, and most of the relevant tests are conducted according to the American Standard ASTM f392 According to the kneading forms that the packaging materials may be subjected to in the actual use, the samples are kneaded in two forms: twisting and crushing The rotation and crushing are carried out at the same time When the rotation is 440 °, the crushing direction moves 90mm, and then continues to crush 65mm One rotation and crushing operation is to complete one kneading of the samples, and the kneading frequency is 45 times / min According to the angle of rotation and the length of crushing stroke, it can be divided into long stroke and short stroke Long stroke refers to 440 ° rotation and 155mm crushing stroke, while short stroke refers to 400 ° rotation and 80mm crushing stroke According to the different kneading times, it can be divided into five kneading modes: A, B, C, D and E mode a refers to long stroke kneading for 1 hour, 2700 times, mode B refers to long stroke kneading for 20 minutes, 900 times, mode C refers to long stroke kneading for 6 minutes, 270 times, mode D refers to long stroke kneading for 20 times, and mode e refers to short stroke kneading for 20 times After the flexible packaging materials are rubbed, the turpentine method and barrier test method are generally used to verify their rubbing resistance Turpentine method tests whether there are pinholes throughout the whole material structure in the rubbed packaging materials The verification process is to lay the rubbed sample on the white paper, brush a layer of colored turpentine on the surface of the sample, remove the sample, and judge whether there are pinholes and pinholes in the sample by checking whether there are any turpentine spots on the surface of the white paper and the size and quantity of the spots The size and quantity of The barrier test is to compare the barrier value of packaging materials before and after rubbing to reflect the material's resistance to rubbing, such as the permeability of oxygen, water vapor or nitrogen before and after rubbing In the kneading test, appropriate kneading mode and verification method shall be adopted according to the material structure and verification purpose According to the Labthink blue light test experience, fdt-02 kneading tester developed based on ASTM f392 shall be used as the testing equipment C The turpentine test shows that there is no pinhole in the material after rubbing the plastic composite film Compared with the before rubbing, the increase of oxygen permeability after rubbing is only 10% The barrier of some samples before and after rubbing is basically the same, so the plastic composite film has a good resistance to rubbing, and the light rubbing strength will not have a great impact on the material structure When testing the plastic composite film or to verify whether the material is easy to produce pinholes, the type A and type B rubbing modes can be selected; C When the aluminum-plastic composite membrane materials are rubbed in the mode, the oxygen permeability of the materials increases by more than 200%, and some materials have through pinholes Therefore, the rubbing resistance of aluminum-plastic composite film packaging materials is relatively poor, and strong rubbing strength can easily make the materials appear through pinholes When testing this kind of materials or to verify the impact of rubbing on the barrier of packaging materials, type C, D and e rubbing modes can be selected Figure 2 fdt-02 kneading tester this paper systematically introduces the test method of kneading resistance of packaging materials according to ASTM f392 standard, and combines with Labthink The daily testing experience of Languang packaging testing laboratory summarizes the rubbing resistance test of plastic composite film and aluminum plastic composite film, summarizes the appropriate test mode for testing different films, and provides reference for monitoring the rubbing resistance of soft plastic packaging materials Labthink Languang is a high-tech enterprise specializing in the R & D and production of packaging testing equipment and packaging testing services, with more than 100 types of testing equipment The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry.
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