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A method for dispensing or depositing particulate material includes accumulating particulate material in a nozzle having an opening at the bottom for discharging the particulate material, and applying positive air pressure to a buffer chamber positioned in communication with the accumulation of part

A method for dispensing or depositing particulate material includes accumulating particulate material in a nozzle having an opening at the bottom for discharging the particulate material, and applying positive air pressure to a buffer chamber positioned in communication with the accumulation of particulate material to start and control the flow of particulate material through the opening and applying negative pressure to the buffer chamber to stop the flow of particulate material. An unobstructed interface can exist between a surface of the particulate material and air in the buffer chamber. In one embodiment, roofing shingle granules are applied intermittently to a moving coated asphaltic sheet through a slot to form strip roofing shingles.

대표청구항 ▼

The method of dispensing particulate material comprising establishing an accumulation of particulate material in a nozzle having an opening at the bottom for discharging the particulate material, establishing a buffer chamber in communication with the accumulation of particulate material such that a

The method of dispensing particulate material comprising establishing an accumulation of particulate material in a nozzle having an opening at the bottom for discharging the particulate material, establishing a buffer chamber in communication with the accumulation of particulate material such that an unobstructed interface exists between a surface of the particulate material and air in the buffer chamber, and changing the air pressure in the buffer chamber to control a flow of particulate material through the opening.