Abstract: Impact resistance is an important factor that affects the use tolerance and lifespan of environmentally friendly packaging bags. This article evaluates the impact resistance of easily degradable handbags by testing the impact quality of darts, and introduces the test principle, equipment parameters and application scope, test process, etc., to provide a reference for the monitoring of the impact resistance of green environmental protection packaging bags. 1. Meaning With the intensification of environmental pollution and the enhancement of people's awareness of environmental protection, the concept of green environmental protection has penetrated into all walks of life, and the packaging industry is no exception. It can replace traditional plastic films such as easy-degradable, recyclable, pollution-free and environmentally friendly green packaging Materials are endless, and easy-to-degrade portable shopping bags are an important part of it. The use of traditional plastic shopping bags is extremely common and is one of the culprits of "white pollution". Therefore, the development and use of materials that can meet the needs of portable shopping bags and easily degradable materials are effective ways to solve the pollution problem and reduce the environmental burden, and the impact resistance is important for investigating the suitability of this new green environmental protection material reference indicator. This paper introduces an evaluation method and verification scheme of impact resistance by testing the impact quality of darts. 2. Test sample This test takes the easily degradable portable vest bag as the test sample. 3. Test basis This article is based on the relevant provisions of the product standard GB / T 21661-2008 "Plastic Shopping Bags" regarding the impact test of darts, and according to the current standard GB / T 9639.1-2008 "Test method for impact resistance of plastic films and sheets. Part: Step Method to test the samples. 4. Test equipment This article uses the BMC-B1 dart impact tester to test the sample, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd. Figure 1 BMC-B1 dart impact tester 4.1 Test principle The general test principle of the free dart method is that at the beginning of the test, the appropriate initial mass of dart and weight Δm value is selected according to the thickness and material of the sample. During the test, the dart falls freely to impact the sample. If the sample is damaged, the mass of the dart is reduced by reducing the weight by Δm. If the sample is not damaged, the mass of the dart is increased by Δm by increasing the weight. The darts hit the sample again, and increase or decrease the quality of the darts according to the test results, and so on, and repeat the test. In short, the use of weights to increase or decrease the mass of darts depends on whether the previous sample is damaged. When the test of 20 samples is completed, calculate the number N of damaged samples. If N is equal to 10, the test is completed; if N is less than 10, continue to add samples to test until N is equal to 10; if N is greater than 10, It is still necessary to continue to supplement the sample test so that the number of unbroken samples is 10. Then the equipment automatically calculates and displays the impact damage quality of the sample according to the calculation formula in the standard. The standard based on this article has already stipulated the quality of the drop weight of the impact material. You only need to use the drop weight impact test to check whether the sample is damaged. The impact resistance of the material is judged according to the number of damaged samples. 4.2 Scope of application It is suitable for the impact resistance test of plastic films, sheets and composite films with a thickness of less than 1 mm, such as PE cling film, stretch film, PET sheet, food packaging bags of various structures, aluminum foil, aluminum-plastic composite film, etc .; The impact resistance test of paper and paperboard; the drop ball impact test and shoulder liner impact test that can be extended to the sample; comply with many national and international standards, such as GB / T 9639.1, ASTM D1709, JIS K7124, ISO 7765, etc. 4.3 Device parameters The two test methods A and B are available for users to choose. The measurement range of Method A is 50 ~ 2000 g, and the measurement range of Method B is 300 ~ 2000 g, which meets the different needs of users; the test accuracy is 0.1 g; according to the test process Auto-judgment of test status; the dart-dropping adopts the principle of electromagnetic suction, which can be automatically released, effectively avoiding the systematic error caused by the artificial release of dart-drop; pneumatically clamps the sample, and provides manual and pedal dual-start mode The unique design of the built-in observation lamp of the equipment is convenient for users to carry out test operations quickly and accurately; equipped with professional computer software, which can support the display of multiple units of test results, graphical display of test process, output and printing functions, which can clearly and intuitively display test results For users; support LystemTM laboratory data sharing system, unified management of test results and test reports. 5. Test process (1) Sample cutting: cut 10 samples of 15 cm × 15 cm from the surface of the sample of the easily degradable portable vest bag to be tested. (2) Parameter setting: Select test mode A on the device control panel, adjust the dart drop height to 0.66 ± 0.01 m, and adjust the adjustable bracket of the device so that the dart drop can impact the center of the sample. (3) Test: One of the samples is clamped into the sample clamping device, the foot switch is stepped on, and the device automatically clamps the sample. Insert the 70 g dart into the magnetic connector vertically, click the test option, the dart will automatically fall, impact the sample, and check the damage of the sample. Repeat the sample-install-dart-test operation until all 10 samples are tested, and the number of unbroken samples is counted. 6. Test results The number of unbroken samples in this test is 9, which meets the technical requirements of GB / T 21661 for dart impact. 7. Conclusion The dart impact quality is an important indicator to measure the impact resistance of the packaging bag. This article tests the dart impact quality of the sample of the degradable portable vest shopping bag. The test process is simple, the equipment is easy to operate, safe and convenient to use, and the test results show that the sample tested High impact resistance. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R & D and production of packaging testing equipment and packaging testing services. Existing equipment can test the barrier properties of packaging bags against various gases such as oxygen, nitrogen, carbon dioxide, air, water vapor, etc. , Physical and mechanical properties such as anti-puncture performance, smooth performance, flexibility and heat sealing performance, total migration and residual solvent and other health and safety performance. The more you understand, the more you trust! 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