Attaching soles to shoes

Abstract From the Canadian patent

Method of bonding a sole to a shoe by applying moisture-curable solvent-free melt adhesive to the sole and/or shoe upper, subjecting the adhesive coating to a hot-cure step with air-borne moisture, and pressing the sole and shoe upper together with the adhesive between them immediately after the hot-cure step preferably in, less than 90 seconds after leaving the hot-cure. With preferred polyurethane melt adhesives the sole and shoe upper are preferably pressed together with a delay of not more than 60 seconds. In some cases the bond is effected without application of adhesive to the sole, which may be merely pretreated by wiping with solvent or primer solution.