Lamination: Lamination (贴膜)
The bonding of a thin TPU or PU film to zipper tape using heat, adhesive or flame treatment. The film provides waterproofing, wind resistance and abrasion protection while keeping the tape flexible. Lamination quality depends on surface preparation, adhesive coverage, temperature and pressure. Defects include bubbles, wrinkles and delamination after washing. Bond strength and water resistance are verified before the zipper is released for production.