Cycle Life: Cycle Life (往复寿命)
The number of open and close cycles a zipper completes before it stops functioning correctly. The test simulates repeated use with a reciprocating machine and records failures such as jamming, tooth loss, self-opening or slider damage. Cycle life is influenced by tooth geometry, surface friction, spring fatigue and plating wear. Results help buyers compare constructions and set warranty expectations for garments, luggage and outdoor equipment.