Method for controlling the discharge of granules from a nozzle o

Coating processes – Solid particles or fibers applied – Roofing produced

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118308, B05D 112

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active

055208894

ABSTRACT:
A method for applying granules to a coated sheet, and in particular a coated asphaltic sheet for use in the manufacture of roofing, comprises controlling a fluid (e.g., pneumatic) counterflow through the discharge opening of a nozzle which holds an accumulation of granules therein to rapidly stop or otherwise modify the flow rate of granules onto the sheet. A buffer chamber is in communication with the granule accumulation in the nozzle, and an apparatus modifies the pressure in the buffer chamber to generate the desired fluid flow through the nozzle opening. A vacuum source provides a negative pressure for a pneumatic counterflow, and a positive pressure source is utilized to increase pressure in the buffer chamber to act as a discharge assistant.

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