Seam Sealing: Seam Sealing (热压封合)
A process that bonds thermoplastic materials with heat and pressure to create a watertight joint. In zippers it is used to form end stops, attach waterproof film and seal the seam between zipper and garment. Temperature, pressure, dwell time and cooling must be matched to the material, or the bond will be weak or the tape will be damaged. Sealed seams are checked by hydrostatic pressure and peel tests.