A contact nozzle (512) for coating at least one elastic strand (12) with an adhesive (14), the contact nozzle (512) comprising: a nozzle body (514) including a front side (524), a rear side (526) and a first V-shaped notch (542) to receive a first elastic strand (12) that has a periphery (20) with an upper surface (80) and that moves in a machine direction, extending said first V-shaped notch (542) between said front and rear sides (524, 526)； a first adhesive conduit (538) formed in said nozzle body (514) and ending in a first adhesive hole (540) that communicates with said first V-shaped notch (542) and adapted to be directed to the upper surface (80) of the first elastic strand (12) for distributing the adhesive (14) in contact with the upper surface (80) of the first elastic strand (12)； characterized by a first expansion chamber (566) formed in said nozzle body (514) and communicating with said first adhesive hole (540), said first expansion chamber (566) sized to allow expansion of the adhesive extrudate (14) leaving said first adhesive hole (540) and a first air duct (544) positioned next to said first adhesive duct (538) and ending in a first air hole (546) positioned downstream of said first adhesive hole (540) in the machine direction, said first hole (546) adapted to be directed towards the upper surface (80) of the first elastic strand (12) and adapted to discharge air into the adhesive (14) in contact with the first elastic strand (12) to cause the adhesive (14) to spread around the periphery (20) of the first elastic strand (12).Una boquilla de contacto (512) para revestir al menos una hebra elástica (12) con un adhesivo (14), comprendiendo la boquilla de contacto (512): un cuerpo de boquilla (514) que incluye un lateral delantero (524), un lateral trasero (526) y una primera entalla en forma de V (542) para recibir una primera hebra elástica (12) que tiene una periferia (20) con una superficie superior (80) y que se mueve en una dirección de máquina,
