Hot-melt applicator

Details Hot-melt applicator Hot-melt applicator

1988-06-30

1989-07-04

Pianalto, Bernard

Coating apparatus

Projection or spray type

Moving projector

118313, 118314, 118315, 222566, 222570, 239270, 239294, 239298, 4272082, 427265, 427424, B05B 300

Patent

active

048440035

ABSTRACT:
A nozzle and a method for applying adhesive to join two surfaces. The nozzle has a body member and a conical tip extending from an outlet face of the body member. A first pair of gas passageways is disposed on a side of the conical tip opposite a second pair of gas passageways. Each of the four gas passageways has a dispensing orifice at the outlet face of the nozzle body. The pairs of passageways are inwardly directed to project streams of gas, preferably air, parallel opposed sides of the conical tip. Thus, the streams of air converge at a distance from the outlet face beyond the apex of the conical tip. These streams of air cradle a stream of material issuing from the apex of the conical tip and cause an oscillatory zig-zag deposition of material. The deposition on a first surface has a resonant frequency and has smooth, controlled radius turns at its edges. A second surface is then brought into contact with the first surface while the adhesive is still in a fluid state.

REFERENCES:
patent: 3348520 (1967-10-01), Lockwood
patent: 4031854 (1977-06-01), Sprague, Jr.

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