How a Zipper Works — One Pull, Two Rows (3D Animation)

How does one slider join two long rows of zipper teeth? Open up a simplified discrete-element zipper and follow the Y-shaped channel as it guides elements together, then apart. See the tapes, fastening elements, slider and pull tab, plus a possible reason for separation behind a moving slider. The optional slider lock has a different job from the interlocking elements themselves. Chapters: 00:00 One Slider. Two Rows. 00:15 The Parts That Matter 00:44 The Y-Shaped Channel 01:16 Opening Reverses The Route 01:42 Why A Zipper Can Split Open 02:16 A Slider Lock Is Different 02:45 Guide. Align. Interlock. Geometry, clearances and motion are simplified and enlarged for explanation. The camera follows the slider, so the chain appears to travel through it. Actual tooth profiles and locking designs vary. A worn or deformed slider is only one possible cause of splitting; this video is not a diagnosis or repair procedure. Technical references: YKK zipper structure: https://www.ykk.com/english/ykk/tech/... YKK slider locks: https://www.ykk.com/english/ykk/tech/... YKK usage manual: https://ykkamericas.com/wp-content/up... Subscribe to Cutaway for more everyday mechanisms opened up in 3D. #Zipper #HowItWorks #3DAnimation