Process for size separating toner particles
US4802977A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | May 6, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B7/086
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for classifying toner particles supplied through a supply nozzle into at least three fractions in a classifying chamber divided into at least three sections and placed under a reduced pressure under the action of the inertia force of the toner particles supplied together with a gas stream and the centrifugal force of the curved gas stream due to Coanda effect. A first gas introduction pipe and a second gas introduction pipe are disposed above the classifying chamber so as to provide a first inlet and a second inlet opening with the first inlet being disposed closer to the supply nozzle than the second inlet. The absolute values of the static pressures P.sub.1 and P.sub.2 in the first and second gas introduction pipes are controlled so as to satisfy the relations of: .vertline.P.sub.1 .vertline..gtoreq.150 mm.aq., .vertline.P.sub.2 .vertline..gtoreq.40 mm.aq. and .vertline.P.sub.1 .vertline.-.vertline.P.sub.2 .vertline..gtoreq.100 mm.aq.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.