Drying system for particles
US4030205A · kind A · utility
Inventors
Key dates
| Filing date | Dec 29, 1975 |
| Grant date | Jun 21, 1977 |
| Priority date | — |
| Expiry date | Dec 29, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF26B21/083
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A system for drying particulate materials such as amorphous polyethylene teraphthalate or other materials that tend to fuse or agglomerate while being heated includes the steps of directing into the lower portion of a dispensing hopper filled with particles of the material a stream of hot dry air at a temperature above the temperature range in which the particles are unstable and tend to cling to one another and allowing the stream of air to pass upwardly through the particles in the hopper and to transfer its heat to the particles and form a temperature gradient in the body of particles in the hopper which is higher than the critical temperature range of the material at the lower portion of the hopper and which causes the particles to pass through the critical temperature range as the particles are dispensed downwardly from the hopper. The particles are agitated in the critical temperature range to prevent the particles from clinging to one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.