Method and apparatus for dispensing droplets of molten thermopla

Details Method and apparatus for dispensing droplets of molten thermopla Method and apparatus for dispensing droplets of molten thermopla

1989-09-27

1990-09-18

Beck, Shrive

Coating processes

Spraying

Moving the base

118300, 4272071, 239 99, 239101, 239296, 239413, B05D 102, B05B 108

Patent

active

049577832

ABSTRACT:
A method and apparatus for dispensing droplets of molten thermoplastic adhesive onto a moving substrate comprises a spray device having a nozzle formed with a discharge outlet which ejects a continuous stream of molten thermoplastic adhesive. A stitcher device connected to a source of pressurized air is operative to supply intermittent, pulsed jets of atomizing air to air jet bores associated with the nozzle which discharge the pulsed air jets into contact with the exterior of the continuous stream of molten thermoplastic material with sufficient energy to shear well defined globules or droplets from the continuous stream and either allow such droplets to fall onto the substrate under the influence of gravity and due to the momentum of the stream in an essentially straight-line pattern, or to project such droplets onto the substrate to form an essentially random pattern of droplets.

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patent: 4711683 (1987-12-01), Merkatoris
patent: 4721252 (1988-01-01), Colton

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