Low pressure polyurethane spraying assembly

Details Low pressure polyurethane spraying assembly Low pressure polyurethane spraying assembly

1997-02-19

1998-09-22

Weldon, Kevin

Fluid sprinkling, spraying, and diffusing

With selective proportioning or correlated flow for plural...

239 74, 239290, 239307, 239343, 239432, 239526, 239532, B05B 700, B05B 128, B05B 730

Patent

active

058102540

ABSTRACT:
A low pressure spraying assembly for mixing and initiating the reaction of a first liquid reactive polymeric material, such as an isocyanate terminated compound, with a second liquid reactive polymeric material, such as an hydroxyl terminated compound or polyol resin, to form a two part polymer, such as polyurethane, and spraying the polymer onto a surface. The spraying assembly includes a material circulating system and a spray gun assembly. The material circulating system comprises separate multiple diaphragm pumps, drive assemblies, flow meters and feedback controllers for each material. The spray gun assembly includes a manifold with a pair of fluid ports for receiving the first and second polymeric materials. A mixing device is mounted to the manifold for mixing the materials to form the two part polymer. A spray tip with an air cap is mounted to the distal end of the mixing device for spraying the polymeric material. The air cap includes both a main outlet port for dispensing the polymer and atomizing outlet ports for atomizing the polymer. The spray gun assembly also includes an air purging operation for simultaneously removing any polymeric materials from the main outlet port and the atomizing outlet ports, thereby preventing any clogging of the atomizing outlet ports.

REFERENCES:
patent: 3383044 (1968-05-01), Norstrud et al.
patent: 4428530 (1984-01-01), Chabria
patent: 4771919 (1988-09-01), Ernst
patent: 4789100 (1988-12-01), Bonf
patent: 4809909 (1989-03-01), Kukesb
patent: 4813603 (1989-03-01), Takeuchi et al.

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