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Bag opening rate test for pre-made bag rotary packing machine
After the pre-made bag rotary packing machine is stably operated, the bag is continuously opened for 30 minutes, and the number of unopened bags is counted according to formula (3), which should meet the requirements of 5.7.

L-opening rate, %;
A- - the number of bags that have not been opened, in bags;
D- - - The total number of bags used, in bags.