Expose the friction coefficient of a sample of polyethylene shrink film produced by an enterprise

Abstract: According to the national recommended standard GB/T 13519-2016, this paper uses the Labthink MXD-02 friction coefficient meter to detect the friction coefficient of a polyethylene shrink film sample produced by an enterprise, and analyzes the test process, equipment parameters, scope of application and The test principle and other contents are introduced to provide a reference for enterprises to strengthen the friction coefficient performance test and quality monitoring of polyethylene shrink film. Keywords: friction coefficient, polyethylene, shrink film, friction coefficient meter, GB/T 13519-2016, static friction coefficient, dynamic friction coefficient 1, meaning friction coefficient is an important factor affecting the ease of use of materials, which appears during the use of packaging materials Slippage, deviation, poor opening and other phenomena are related to the inappropriate friction coefficient. Polyethylene shrink film is a common heat shrinkable film material, which is often used in the outer packaging of beer, beverages, wood, ceramics, electronic products, industrial products and other products. If the friction of polyethylene shrink film is low, it will The sliding property is large, and the product is easy to fall off. The obsolete national standard for polyethylene shrink film GB/T 13519-1992 'Polyethylene heat shrinkable film' does not involve friction coefficient, and it replaces the standard GB/T 13519-2016 'Polyethylene heat shrinkable film for packaging' (2016 (Implemented on November 1, 2010), the friction coefficient was included in the investigation of other properties of polyethylene shrink film. Although the standard does not specify specific index requirements for the friction coefficient, it only stipulates that the supply and demand The membrane puts forward higher requirements. Therefore, the detection and control of the friction coefficient of polyethylene shrink film is an effective way to improve its performance, and it is also a basic requirement of the standard. 2. The test is based on the requirements of GB/T 13519-2016. The friction coefficient is tested in accordance with the requirements of GB 10006-1988 'Method for Determination of Friction Coefficient of Plastic Films and Sheets'. GB10006 is suitable for non-sticky plastic films and sheets with a thickness of less than 0.2mm. Or test the static friction coefficient and dynamic friction coefficient when the surface of other materials slides. 3. Test sample The sample tested in this test is a polyethylene shrink film produced by an enterprise, and the friction coefficient between the test sample and the glass is tested. 4. Testing equipment In this paper, MXD-02 friction coefficient meter is used to test the friction coefficient of samples. This equipment is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd. The test method of the friction coefficient of polyethylene shrink film Figure 1 MXD-02 friction coefficient meter 4.1 Test principle The friction coefficient is the ratio of the friction force between the two contact surfaces to the vertical force acting on one of the surfaces. This test passed a certain specification The slider applies a certain pressure to the sample, and the tensile force value of the test sample when the sample slides relative to the friction surface at the set test speed can obtain the friction coefficient of the sample. 4.2 Scope of application (1) This equipment is professionally used to measure plastic films and sheets, rubber, paper, cardboard, woven bags, textiles, non-woven fabrics, metal material composite belts for communication cables and optical cables, conveyor belts, wood, coatings, brakes The coefficient of static and dynamic friction when sliding blades, wipers, shoe materials, tires and other materials. It can also be used to determine the slipperiness of cosmetics, eye drops and other daily chemicals. (2) This equipment can meet many national and international standards such as GB 10006, ISO 8295, ASTM D1894, TAPPI T816, etc. 4.3 Test parameters The equipment can simultaneously determine the dynamic and static friction coefficients of the sample in one test; the test load range is 0 ~ 5 N, and the test accuracy is 0.5; according to the requirements of different test standards, the equipment has 70 mm and 150 mm Two kinds of test strokes are available; the weight of the standard slider used in the equipment is 200 g, and the sliders of other weights can be customized according to specific needs; the instrument test bench and test slider have been demagnetized and tested for remanence, effectively reducing System test error. 5. Test process (1) Cut 3 pieces of 8 cm × 20 cm samples from the polyethylene shrink film sample to be tested, and use the inner surface of the sample as the test surface. Do not touch the inner surface with your hands when cutting the sample. Ensure that the inner surface is not scratched or polluted. (2) Fix one of the samples on the slider, the outer surface is in direct contact with the slider, and the glass plate for friction is fixed on the steel plate of the equipment. Do not touch the friction area with your hands during the process of fixing the sample and the glass plate. (3) Place the slider in the middle area of u200bu200bthe glass plate without impact to ensure that the force measurement system is not stressed. (4) Set test parameters such as test speed and test stroke, and click the start test option to start the test. (5) 15s after the sample is in contact with the glass plate, it starts to move relative to each other. The equipment automatically records the force value changes during the test and calculates the test results. (6) Repeat the sample loading-click test process to test the dynamic and static friction coefficients of the remaining two samples. 6. Test results The friction coefficient of the polyethylene shrink film sample is the arithmetic average of the test results of three samples, the static friction coefficient is 0.131, and the dynamic friction coefficient is 0.097. 7. Conclusion The friction coefficient affects the packaging effect and performance of the polyethylene shrink film The new version of GB/T 13519-2016 has increased the testing requirements for the friction coefficient of polyethylene shrink film. From the test process of the friction coefficient between the polyethylene shrink film sample and the glass plate in this article, the test is simple, the equipment is easy to operate, and can accurately reflect the friction coefficient of the polyethylene shrink film. The selected friction surface is different, and the friction coefficient measured by the same sample is different. Therefore, when testing the friction coefficient of the polyethylene shrink film, a reasonable selection of the friction surface should be made according to the different contact products. In addition, the friction area of u200bu200bthe sample should be prevented from being contaminated during the sample preparation process to ensure the accuracy of the test results. The leading brand of POF/PE heat shrinkable film and imported stretch film Shenzhen Co., Ltd. has leading equipment and strong technical strength. Production of POF shrink film, PE heat shrinkable film, PVC shrink film, imported stretch film, environmentally friendly shrink film, PET shrink film, An integrated manufacturer of packaging materials such as packaging bags.