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(11) | EP 0 367 985 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Nozzle attachment for an adhesive spray gun |
| (57) An apparatus for spraying heated hot melt adhesive in elongated strands or fibers
in a controlled, spiral pattern upon a substrate comprises a spray gun (10) having
a nozzle (14) formed with an adhesive delivery passageway (56) and an air delivery
passageway (94) both of which terminated at the base of the nozzle (14). A nozzle
attachment (18) in the form of a one-piece annular plate is mounted to the base of
the nozzle (14) by a cap (62). The annular plate (18) is formed with a throughbore
(110) which receives hot melt adhesive from the adhesive delivery passageway (56)
and ejects an adhesive bead through a nozzle tip (108) formed on the outer side of
the plate (18) opposite the nozzle (14). An annular groove (112) formed in the outer
side of the plate (18) facilitates drilling of air jets bores (118) therein at an
angle relative to the throughbore and adhesive bead ejected therefrom. The air jet
bores (118) receive pressurized air from the air delivery passageway (94) in the nozzle
(14) and direct jets of pressurized air substantially tangent to the adhesive bead
to form elongated adhesive fibers and to impart a spiral motion to the elongated fibers
so that they are formed in a compact spray pattern for deposition onto a substrate.
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