Patent ID: 7857927
Filing Date: 2010-12-28
Classification: D05B,Y10T

Abstract:
1. A method for producing a bonded seam which is not susceptible to coming undone, with at least one of an interlooped and interlaced stitching thread and with stitching passing into at least one thickness of the material of a sewn object which receives the seam, this seam comprising at least one strand of sewn stitching thread extending on the exterior of the sewn object and extending adjacent to at least one other strand of sewn stitching thread on the exterior of the sewn object, comprising the sequential steps of: producing an unbonded seam using at least one stitching thread having an exterior of thermoplastic material, the thermoplastic material having a softening temperature and a melting point temperature; applying at least one laser beam on the unbonded seam at a local point of the thermoplastic material exterior of at least one strand of sewn stitching thread extending on the exterior of the sewn object adjacent to at least one other strand of sewn stitching thread on the exterior of the sewn object, each laser beam adapted to locally raise a temperature of the thermoplastic material, at the local point, equal to at least the softening temperature but below the melting point temperature to soften the thermoplastic material of the at least one strand of sewn stitching thread adjacent to the at least one other strand of sewn stitching thread, the laser beam being applied without melting any thermoplastic material; and before complete re-solidification of the softened thermoplastic material, applying at least one pressing device to the softened thermoplastic material of the at least one strand of stitching thread to form bonding points of the softened thermoplastic material bonding together at least some of the adjacent strands on the exterior of the sewn object.