Powder feed device for powder dispensing apparatus
US4185783A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1978 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Jun 12, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B5/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.