Powder feed device for powder dispensing apparatus
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United States of America Patent
Stats
-
Jan 29, 1980
Grant Date -
N/A
app pub date -
Jun 12, 1978
filing date -
Jun 14, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A powder feed device for supplying a powder dispensing apparatus such as a powder spray gun of an electrostatic powder deposition system. Entrained powder is extracted from a fluidization tank and transported through a half-inch diameter tube or hose to the dispensing apparatus. To prevent clumps of powder and/or powder adhering to the walls of the tube or hose while permitting reduced air flow speed of about 2 to 3 m/s an electric field is provided in the tube or hose and applied by an outer conductor extending around the tube or hose and an inner wire conductor inside the tube or hose extending in the direction of the flow of entrained powder, which conductors are connected across an AC voltage source. The electric field may operate constantly or intermittently.
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