This tester is used to measure the torsion resistance of zipper head , in order to be the reference of product improvement.
本机系用来测试拉链头的扭力强度，作为品质改良的参考依据。
Its performance has been tested to the extent that the flexible sub can provide enough resistance to tension, compression and torsion.
并对其进行了性能检测，证明其中的挠性接头具有足够大的抗拉、压、扭能力。
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