Method and apparatus for pulping and grading waste material
US4222817A · kind A · utility
3Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1978 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Jun 26, 1998 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21B1/345
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for pulping and grading waste paper in which stock is introduced through a central inlet in one end wall of a cylindrical chamber and accepts are discharged through a perforate screen in the opposite end wall. An impeller in the chamber adjacent the perforate screen provides for pulping and pumping of the stock as well as provides rotational movement of the stock within the chamber. Light rejects are continuously removed through an outlet adjacent the wall containing the perforate screen while heavy rejects are removed through an outlet adjacent the inlet wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.