Impact Resistance of Plastic Film by the Free-Falling Dart is the energy of a plastic film or sheet sample that breaks down to 50% under the impact of a free dart at a given height. Destroy quality representation. Standard GB9639-88 stipulates that the energy of 50% plastic film and thin sample is damaged under the impact of free dart at a given height, and the impact resistance is characterized by impact damage quality. GB9639 free dart impact test machine The free dart impact test machine tests the dart impact process as follows: The calculation method specified in the standard is as follows: • At the beginning of the dart drop test, first select the test method, estimate an initial mass and Δ m value, and test. If the first sample is damaged, use the weight △ m to reduce the mass of the falling body; if the first sample is not broken, the weight of the falling body should be increased by the weight △ m. In summary, using a weight to reduce or increase the mass of the body depends on whether the previous sample is broken. After the test of 20 samples, calculate the total number of damages N. If N is equal to 10, the test is completed. If N is less than 10, continue the test after the sample is replenished until N is equal to 10; if N is greater than 10, continue the test after the sample is replenished until it is not damaged. The total number is equal to 10, and then the dart impact strength result is automatically calculated by the system. Laboratory Spectrophotometer,Spectrophotometer Principle,Lab Spectrophotometry,Flame Spectrophotometer For Lab Guangdong Widinlsa International Co.Ltd , https://www.guangdongwidinlsa.com
Dart impact test, it is recommended to recommend the free dart impact test machine BMC-AB developed by Jinan Sanquan Zhongshi Experimental Instrument Co., Ltd., which implements GB 9639 (plastic film and sheet impact resistance test method free dart method), ASTM D1709 (Standard test method for testing the impact resistance of plastic films by the free dart method), suitable for the impact quality of 50% plastic film or sheet specimens when the plastic film or sheet is subjected to free dart impact at a given height. And energy. 
(1) Estimate the damage mass Mf, choose ΔM;
(2) Place the weight according to the estimated initial value, so that the darts are free to fall;
(3) According to the impact of the darts on the film, determine whether to increase the weight or reduce the weight: reduce the weight when the damage is broken, and reduce the weight when the damage is not broken;
(4) First, conduct 20 tests and determine whether to terminate the test as follows:
First calculate the total number of damages N. If the total number of damages is equal to 10, the test is over. If it is not equal to 10, press Continue to continue the test:
(a) If N is less than 10, continue the test until N equals 10;
(b) If N is greater than 10, continue the test until the number of unbroken is equal to 10.
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