Test method for rubbing resistance of self standing bag packaging of freeze-absorbing products

Abstract: the self-supporting bag is a kind of packaging form which is often used to absorb frozen products The kneading resistance of this kind of packaging is an important factor affecting the quality of the packaged products In this paper, Labthink Languang fdt-02 kneading tester is used to knead the aluminum-plastic composite film used to make self-contained bags, and turpentine method is used to evaluate the results of the kneaded samples Through the description of the test process, equipment principle, parameters and application scope, it can provide a reference for enterprises to monitor the kneading resistance of soft plastic packaging materials Key words: freeze absorption, self standing bag, rubbing resistance, rubbing tester, aluminum plastic composite film, turpentine method, pinhole 1, significance As the name suggests, the self-supporting bag is a kind of packing bag that can stand on its own without any support and whether it is opened or not This packing form has many advantages, such as improving product grade, strengthening visual effect, portability, convenient use, fresh preservation, good sealing performance, etc., and has been used in jelly, edible oil, jam, beverage, washing liquid and other liquids, gels Packaging of semi-solid products At present, the common self-supporting bags mainly include ordinary self-supporting bags, self-supporting bags with suction nozzle, self-supporting bags with zipper, self-supporting bags with imitation mouth, and special-shaped self-supporting bags The materials used are mainly aluminum-plastic composite films The self standing bag made of aluminum plastic composite film has high stiffness and good barrier However, due to the poor rubbing resistance of the aluminum foil layer, the aluminum foil layer is easy to be damaged and pinholes are formed under the action of bending and bending of external force For the aluminum plastic composite film, the barrier is mainly the aluminum foil layer If pinholes appear in the aluminum foil layer, the barrier of the whole material will decrease and the product will deteriorate, It will even form pinholes throughout the whole material, so that the barrier loss of packaging, product leakage Therefore, by strengthening the test of the rubbing resistance of the aluminum-plastic composite film, it can effectively prevent the self-supporting bag from pinholes at the crease of the bag bottom or other parts of the bag body Fig 1 various types of self standing bags 2 At present, there is no method standard related to the rubbing resistance of flexible plastic packaging in China The test process is based on the American Standard ASTM f392 3 Test sample the test sample used in this test is the aluminum-plastic composite film used to absorb the frozen self standing bag 4 The test equipment used in this paper is fdt-02 kneading tester independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Fig 2 test principle of fdt-02 kneading tester 4.1 this equipment is to knead the sample horizontally and vertically by simulating the kneading effect that the sample of soft plastic packaging material may be subjected to in the use process The kneading strength can be determined by selecting different kneading modes (different kneading times) There are two main methods to evaluate the rubbing resistance of samples One is to determine the barrier performance by comparing the samples before and after rubbing For the samples with good rubbing resistance, there is little change in the barrier performance before and after rubbing, while for the samples with poor rubbing resistance, the barrier performance after rubbing is far lower than that before rubbing; the other is to analyze the samples after rubbing by turpentine oil method, if penetration occurs The pinhole of the whole sample will form turpentine spots on the white paper By comparing the number and size of spots, the rubbing resistance of the sample can be obtained 4.2 kneading frequency of equipment parameters: 45 times / min Rubbing angle: 440 ° or 400 ° Horizontal stroke: 155 mm or 80 mm Number of samples: four identical or different samples can be tested at the same time in one test Kneading mode: A, B, C, D, e five kneading modes are available Scope of application (1) film category: it is applicable to the test of anti rubbing performance of plastic film, sheet and composite film, such as all kinds of composite film for packaging, aluminum coating film, aluminum plastic composite film, nylon film, coating film, etc (2) paper: it is suitable for the anti kneading performance test of paper materials (3) standard: meet ASTM f392 5 During the test (1) three 200 mm × 280 mm Rectangular samples were cut from the surface of the aluminum-plastic composite film samples for the self-supporting bags (2) wrap three pieces of sample on three pairs of rotating shafts of kneading tester, and fix the sample with fixing clamp (3) select the appropriate kneading mode, and select mode C in this test (4) start the test, after reaching the set kneading times, the equipment will stop automatically and take down 3 pieces of samples (5) cut one 150 mm × 200 mm sample from each of the three rubbed samples (6) take a piece of white paper and lay it on the test board, and then put a 150 mm × 200 mm sample on the white paper Apply the prepared turpentine oil on the surface of the sample repeatedly After standing for 1 minute, take the sample and observe whether there are red spots on the white paper and the size and quantity of the spots (7) repeat (6) until all 3 samples are tested 6 The results showed that there were more than 4 spots with diameter of 3 mm ~ 5 mm on the three white papers, which indicated that under the C-mode rubbing action, there were through pinholes on the surface of the sample, and the rubbing resistance of the sample tested in this test was poor 7 Conclusion the rubbing resistance of the aluminum-plastic composite membrane used for making the self-supporting bag is an extremely important performance index, which determines the barrier of the self-supporting bag after being rubbed by external force in the use process In this test, fdt-02 kneading tester is used to knead the test sample in C mode, and turpentine method is used to verify the pinholes formed on the surface of the sample after kneading The test process is simple, the equipment is easy to operate, and the test results are convenient for statistics It is a simple and easy test method for the kneading resistance test of soft plastic packaging materials Labthink Languang is a high-tech enterprise specializing in the development and production of packaging testing equipment At present, the testing equipment that has been produced includes not only the kneading tester involved in this paper, but also the gas transmission tester, oxygen transmission tester, water vapor transmission tester, intelligent electronic tensile tester, friction coefficient tester, headspace gas analyzer, atomization tester, torque tester Instrument, heat seal tester, evaporation residue constant weight tester and other testing equipment, to understand the relevant information of the equipment, Jinan Languang The more you understand, the more you trust! 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