| 摘要 |
A double layer zipper includes two zipper tapes, each zipper tape having a seal strip covered on transverse top and bottom edges and one longitudinal side edge thereof and stitched with the associating interlocking series of teeth, and an interlocking series of teeth formed of a series of coils and respectively fastened to each of opposing top and bottom sides of each of the zipper tapes, each coil having a coil head and a coil body connected to the front side of the coil head, the coil body having a recessed face disposed adjacent to the associating coil head, two flank portions disposed at two opposite lateral sides of the recessed face and a neck connected between the recessed face and associating coil head so that each coil has a tadpole-shaped profile.
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