Abstract: The friction coefficient is an important performance index of soft plastic packaging. The value of this index will directly affect the convenience of the packaging materials in the process of use. This paper introduces the precautions of the friction coefficient test process of soft plastic packaging film and the selection of friction surface, which provides a reference for how to accurately detect the friction coefficient of the packaging materials used.
Keywords: friction coefficient, static friction coefficient, dynamic friction coefficient, friction surface, smoothness, slip, bun, soft plastic packaging
1, meaning
The coefficient of friction is a physical quantity used to characterize the amount of resistance generated by a soft plastic packaging material when it is in contact with other materials such as packaging machinery and relative motion during use. In the actual production process, the friction coefficient of the packaging material is too large or too small, which will adversely affect the production process. For example, if the friction coefficient is too large and the packaging material is twisted, a large pulling force is required to rotate the reel for winding. Bag making, which not only increases energy consumption, reduces production efficiency, and may even cause tensile deformation of the packaging material, affecting its barrier properties and physical and mechanical properties such as impact resistance and puncture resistance; while the friction coefficient is small, it is easy This causes problems such as slippage, deviation, unsteady stacking, and misalignment during the use of the material. Therefore, controlling the friction coefficient of the flexible plastic packaging film is of great significance in improving the ease of use within a suitable range.
The friction coefficient of soft plastic packaging materials is mainly affected by additives such as slip agent and anti-blocking agent added in the material production process, and also related to the stiffness and hardness of the material itself. Generally speaking, if the amount of slip agent added in the material is large, the material has good smoothness and a small friction coefficient. In addition, the material itself has high stiffness and high hardness, so the surface of the object is not too docile. It is easy to slide, so its friction coefficient is small.
2, the choice of friction surface
The corresponding friction coefficient of the same material on different friction surfaces is different. In order to truly reflect the friction coefficient of the soft plastic packaging materials in different use parts, the appropriate friction surface should be selected during the test. Throughout the use process of the soft plastic packaging material in the whole process of drawing, bag making, filling, heat sealing, etc., the frictional parts include the inner surface of the soft plastic packaging (hot cover) and the outer surface (non-hot cover). Between the inner surface and the inner surface, between the outer surface and the outer surface, between the inner surface and the production equipment, between the outer surface and the production equipment, when testing the friction coefficient, the corresponding friction surfaces are the outer surface of the inner surface, The inner surface, the outer surface, the outer surface, the outer surface, the inner surface, the test surface, and the outer surface, the test surface. The friction coefficient between different friction surfaces is abnormal, and the influence on the use of soft plastic packaging is also different. If the friction coefficient between the inner surface and the inner surface is low, it is prone to problems such as unstable stacking and heat sealing. If the friction coefficient is too high, it will be difficult to open; the coefficient of friction between the inner surface and the outer surface will affect the winding process.
3. Detection method
At present, the domestic testing method for the friction coefficient of soft plastic packaging materials is generally based on the method standard GB 10006 "Method for Measuring the Friction Coefficient of Plastic Films and Sheets". In the test of the friction coefficient by this method, in order to ensure the accuracy of the test results, the friction coefficient of the sample can be truly reflected, and the following aspects should be noted:
During the process of cutting samples and loading, you should not touch the part to be tested of the sample by hand. The surface of the sample to be cut should be flat without scratches or wrinkles.
The clamped sample should be close to the surface of the slider, and the tightness should be as consistent as possible;
When the slider with the small sample is placed on the test bench or the sample, the direction of relative movement of the two samples should be parallel to the test direction, and the force measuring system of the device is just not subjected to force;
When testing the coefficient of friction between the soft plastic package and the test bench, the test bench should be carefully wiped 3 times in one direction with alcohol cotton before the test to prevent the oil stains and dust on the table from affecting the test results.
4, test equipment
The test equipment used for friction coefficient detection is friction coefficient meter, such as Labthink MXD-01 friction coefficient meter, MXD-01A friction coefficient meter, MXD-02 friction coefficient meter, etc. These equipments are all limited by Jinan Languang Electromechanical Technology Co., Ltd. The company's independent research and development production, equipment testing accuracy, high degree of intelligence, a wide range of applications, in addition to the soft rubber packaging material friction coefficient test, but also for paper, woven fabrics, non-woven fabrics, woven bags, rubber, Test of friction coefficient of materials and products such as printed matter, aluminum foil and metal products. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D and production of packaging testing equipment. You can find out more about friction coefficient meter or other testing equipment. The more you understand, the more you trust! Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry!
Figure 1 MXD-01 friction coefficient meter
Figure 2 MXD-01A friction coefficient meter
Figure 3 MXD-02 friction coefficient meter
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