Test principle:
Use suitable strong glue to paste the test piece on a belt, and then install the belt with the test piece on the BATA belt tortuosity testing machine, and drive the belt to the selected slave through the driving wheel of the BATA belt tortuosity testing machine. After a certain number of twists and turns, observe whether the test piece of the sole is cracked and the growth rate of the crack after the crack occurs, and then evaluate the tortuosity resistance of the test sole.