Device for dispensing granular roofing media on a moving sheet in a pattern
Abstract:
A method and device for dispensing granules in a pattern on a moving sheet, the device having: a granule source; a pattern roll, the pattern roll having a hollow interior and cylindrical outer surface comprising: a granule transfer zone; and an opening to the hollow interior, the method comprising: providing a flow of granules from a granule source directed toward the cylindrical outer surface of the pattern roll; rotating the pattern roll about a longitudinal axis through a granule transfer cycle comprising: a receipt portion wherein the granule transfer zone receives granules from the granule source; a retention portion wherein granules are retained in the transfer zone while the pattern roll rotates; and a release portion wherein granules dispensed onto the moving sheet; capturing a bypass flow of granules that flow through the opening into the hollow interior; and recycling the bypass flow of granules.
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