Method for applying coatings to solid particles
US3991225A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1974 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Dec 12, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05C9/005
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The apparatus provides a homogeneous (with respect to particle size), dense, mass of sized particles in random motion so that highly uniform coatings of the same or of different solids can be applied to each particle by conventional spray-coating with the liquified coating material(s). The apparatus is a horizontal rotary drum containing lifting flights. A novel deflector pan is fixed in space inside the upper section of the drum which deflects particles falling from the lifting flights to the side of the drum where they form a narrow, dense falling cascade. The coating material is sprayed onto the cascading particles, preferably as they free-fall after leaving the lower edge of the pan. However, if desired, some or most of the coating material may be directed onto the top edge of the moving bed including the juncture of the cascade therewith.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.