Attaching soles to shoes
AssigneeEmhart Industries, Inc.
InventorsRaymond Hanson, Christopher M. Allen, Karl-Heinz Albert, Hubertus von Voithenberg
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Abstract
Method of bonding a sole to a shoe by applying moisture-curable melt adhesive to the shoe upper, subjecting the adhesive coating to a hot-cure step with airborne 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. The bond is effected without application of adhesive to the sole, which is merely pre-treated by wiping with solvent or primer solution.
Claims2
A method of bonding a PVC, thermoplastic rubber or polyurethane shoe sole to a shoe upper which consists of:
- pretreating the PVC, thermoplastic rubber or polyurethane sole by wiping with a solvent or primer solution;
- applying a fast-curing moisture-curable hot melt adhesive to the shoe upper;
- immediately after the application of said adhesive, subjecting the adhesive to a hot-cure step with airborne moisture for a time of from about 30 to about 120 seconds at a temperature of about 100.degree. C. to about 110.degree. C. and a relative humidity of less than 30%;
- and
- pressing the shoe upper and the sole together with the adhesive between them in less than immediately after the shoe upper has left the hot-cure step.
Dependencies are inferred from the claim text.