Adhesive spray gun and nozzle attachment

A nozzle attachment for use in an apparatus for spraying hot melt adhesive which includes a gun body having a nozzle formed with an adhesive passageway for conveying heated hot melt adhesive and an air delivery passageway for conveying pressurized air, said nozzle attachment comprising:

• a one-piece annular plate formed with a first surface on one side of said plate, and a second surface on an opposite side of said plate having a nozzle tip extending outwardly therefrom;
• said plate being formed with a throughbore extending between said one side and said nozzle tip, said plate being adapted to mount to said nozzle of said gun body so that said throughbore communicates with said adhesive passageway in said nozzle for receiving heated hot melt adhesive, the hot melt adhesive being ejected from said nozzle tip in said annular plate to form an adhesive bead;
• said plate being formed with a substantially V-shaped annular groove forming first and second sidewalls each extending inwardly from said first surface toward said second surface and intersecting one another, said annular groove being adapted to communicate with said air delivery passageway in said nozzle of said gun body;
• said plate being formed with a plurality of bores extending from said annular groove in communication with said air delivery passageway to said second surface for transmitting air therethrough, said bores each having a longitudinal axis extending substantially perpendicular to one of said first and second sidewalls of said V-shaped annular groove, said bores being formed at an angle with respect to said throughbore in said plate to direct pressurized air flowing therethrough substantially tangent to the outer periphery of said adhesive bead ejected from said nozzle tip to form said adhesive bead in elongated adhesive fibers and to impart a twisting motion to said elongated adhesive fibers to form a spiral spray pattern of elongated adhesive fibers for deposition on a substrate.