Spray apparatus

Details Spray apparatus Spray apparatus

2005-10-04

2005-10-04

Pianalto, Bernard (Department: 1762)

Coating apparatus

Projection or spray type

Plural projectors

C118S300000, C118S324000, C427S421100, C427S422000, C427S424000

Reexamination Certificate

active

06951586

ABSTRACT:
The disclosed invention consists of an improved gypsum based, cellulosic containing board and method for applying a resin to an untreated board at a spray station where pMDI resin is sprayed onto the front and back side of the board. A resin distribution system is used to supply the spray nozzles with pMDI. Optionally, a second spray station is included, if desired, to add additional pMDI resin over the surface of the board to achieve complete coverage. The improvement is an increased water resistance and flexural strength.

REFERENCES:
patent: 3771893 (1973-11-01), Miller

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