초록 ▼

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 ai

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.

대표청구항 ▼

The method of depositing molten thermoplastic material onto a substrate, comprising: ejecting a continuous stream of molten thermoplastic material from a discharge outlet, said stream having momentum in a direction toward the substrate and having an exterior surface; intermittently impacting said st

The method of depositing molten thermoplastic material onto a substrate, comprising: ejecting a continuous stream of molten thermoplastic material from a discharge outlet, said stream having momentum in a direction toward the substrate and having an exterior surface; intermittently impacting said stream of molten thermoplastic material with a jet of atomizing air which initially contacts said exterior surface of said stream to shear said stream of molten thermoplastic material into droplets; controlling the energy with which said jet of atomizing air impacts said stream so that said droplets are allowed to fall onto the substrate under the influence of gravity and due to the momentum of said stream, said droplets being deposited onto the substrate in a pattern wherein said droplets are substantially uniformly spaced from one another and are of substantially uniform size.