Abstract: Impact resistance is an important factor affecting the durability and longevity of green packaging bags. In this paper, the impact resistance of the easily degradable tote bag was evaluated by testing the dart impact quality, and the test principle, equipment parameters, scope of application, and test procedure were introduced to provide reference for the monitoring of the impact resistance of green packaging bags.
Key words: impact resistance, dart impact quality, dart impact tester, green, packaging, film
1 , meaning
With the increase 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. The packaging industry is no exception. It can replace the environmentally friendly green packaging of traditional plastic film which is easy to degrade, recyclable and pollution-free. The materials are endless, and the easy-to-degrade portable shopping bags are an important part of them.
The use of traditional plastic shopping bags is extremely common and is one of the culprit of “ white pollution †. Therefore, the development and use of materials that can meet the needs of portable shopping bags and easy to degrade are effective ways to solve pollution problems and reduce environmental burden, and impact resistance is important for examining the applicability of this new green environmental protection material. reference indicator. This paper introduces an evaluation method and verification scheme of impact resistance by testing the quality of dart impact.
2 , test samples
In this test, a disposable vest bag with easy degradation was used as a test sample.
3 , the test basis
This article is based on the relevant provisions of the product standard GB/T 21661-2008 "Plastic Shopping Bag" on the dart impact test, according to the current standard GB/T 9639.1-2008 "plastic film and sheet impact resistance test method free dart method first Part: The Staging Method tests the sample.
4 , test equipment
In this paper , the sample is tested by BMC-B1 Dart Impact Tester. The equipment is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 1 BMC-B1 Dart Impact Tester
4.1 Test principle
The conventional test principle of the free dart method is that, at the beginning of the test, the dart and the weight Δm value of the appropriate initial mass are selected according to the thickness and material of the sample . During the test, the darts freely drop the impact sample. If the sample is damaged, the weight of the dart is reduced by Δm by reducing the weight . If the sample is not damaged, the weight of the dart is increased by Δm by increasing the weight , and then the mass is changed. The darts impact 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 summary, using a weight to increase or decrease the quality of the dart depends on whether the previous sample was damaged. When the test of 20 samples is completed , the number N of the damaged samples is calculated . If N is equal to 10 , the test is completed; if N is less than 10 , the sample is continuously replenished until N is equal to 10 ; if N is greater than 10 , It is still necessary to continue to replenish the sample test so that the number of unbroken samples is 10 . The device then automatically calculates and displays the impact damage quality of the specimen according to the calculation formula in the standard.
However, the standard according to the basis of this article has specified the drop weight of the impact material. It is only necessary to use the drop hammer impact test to check whether the sample is damaged or not. The impact resistance of the material is judged according to the number of damaged samples.
4.2 Scope of application
Suitable for impact resistance test of plastic film, sheet and composite film with thickness less than 1 mm , such as PE cling film, wrapping film, PET sheet, food packaging bag of various structures, aluminum foil, aluminum-plastic composite film, etc.; Impact test of paper and paperboard; scalable ball drop impact test and shoulder lining impact test; conform to many national and international standards, such as GB/T 9639.1 , ASTM D1709 , JIS K7124 , ISO 7765, etc.
4.3 Equipment parameters
A and B test methods are available for users to choose. The measurement range of A method is 50 ~ 2000 g , and the measurement range of B method is 300 ~ 2000 g , which meets the different needs of users; the test accuracy is 0.1 g ; according to the test process Automatically judge the test state; the darts adopt the principle of electromagnetic suction, which can be automatically released, effectively avoiding the systematic error caused by artificially releasing the darts; pneumatically clamping the sample, and providing the manual and pedal dual start mode, and The unique design of the built-in observation light allows the user to perform test operations quickly and accurately. The professional computer software can support the test results in multiple unit display, test process graphic display, output and print functions, and can display test results clearly and intuitively. To the user; support the Lystem TM laboratory data sharing system, unified management of test results and test reports.
5 , the test process
(1) cutting the sample: the test sample readily degradable hand vest pocket cut surface taken 15 cm × 15 cm specimen 10.
(2) Parameter setting: Select test mode A on the equipment control panel , adjust the dart drop height to 0.66 ± 0.01 m , adjust the adjustable bracket of the equipment, so that the dart can impact the center of the sample after falling.
(3) Test: Take one of the samples into the clamping device, step on the foot switch, and the device automatically clamps the sample. Insert the 70 g dart vertically into the magnetic connector, click the test option, the dart will automatically drop, impact the sample, and check the damage of the sample. Repeat the clamp - mounting darts - test operation until all 10 samples have been tested and count the number of unbroken samples.
6 , test results
The number of unbroken samples in this test was 9 and met the technical requirements of dart impact in GB/T 21661 .
7 , conclusion
Dart impact quality is an important indicator to measure the impact resistance of bags. This paper tests the dart impact quality of easy-degradable portable vest shopping bag samples. The test process is simple, the equipment is easy to operate, safe and convenient to use, and the test results show the tested samples. High impact resistance. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging inspection services for packaging inspection equipment. The existing equipment can test the barrier properties of packaging bags for oxygen, nitrogen, carbon dioxide, air, water vapor and other gases. , physical and mechanical properties such as puncture resistance, smoothness, flexibility and heat sealing performance, total migration and solvent residue and other sanitary safety performance . 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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