Adhesive spray gun and nozzle attachment

Fluid sprinkling – spraying – and diffusing – Including supplemental gas shaping or shielding jet – Plural sets of gas jet orifices

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239135, 239406, 239412, 239549, 239600, 2394173, 425 7, B05B 134

Patent

active

047859962

ABSTRACT:
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 having a nozzle formed with an adhesive delivery passageway and an air delivery passageway both of which terminate at the base of the nozzle. A nozzle attachment in the form of an annular plate is mounted to the base of the nozzle by an end cap. The annular plate is formed with a throughbore which receives hot melt adhesive from the adhesive delivery passageway and ejects an adhesive bead through a nozzle tip formed on the plate. An annular groove formed in the plate facilitates the drilling of air jet bores therein at an angle relative to the throughbore and adhesive bead ejected therefrom. The air jet bores receive pressurized air from the air delivery passageway and direct the 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.

REFERENCES:
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patent: 2626424 (1953-01-01), Hawthorne, Jr.
patent: 3053461 (1962-09-01), Inglis
patent: 3152923 (1964-10-01), Marshall et al.
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patent: 3825379 (1974-07-01), Lohkamp et al.
patent: 3841567 (1974-10-01), Drozek et al.
patent: 4185981 (1980-01-01), Oshato et al.
patent: 4219157 (1980-08-01), Binoche
patent: 4411389 (1983-10-01), Harrison
Technical Publication of Nordson Corporation, Amherst, Ohio, 1981, (Publication 43-1-11).

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