Method and apparatus for improving the quality of paper manufactured from recycled paper with a hydrokinetic amplifier
US4726880A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Dec 18, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for improving the quality of paper manufactured from a contaminated fibrous stock having therein recycled paper pulp and contaminants smaller than a predetermined size and with a specific gravity approximately that of the specific gravity of whitewater used in the production of recycled paper stock comprises a hydrokinetic amplifier having a mixing chamber connected to each of a steam inlet, a stock inlet, a chemical feed inlet, an overflow discharge and a venturi. The venturi is connected to an outlet of the hydrokinetic amplifier. The apparatus also includes a pulper, a dump chest, a cyclone separator, a pressure screen, a vibratory screen, a holding tank, a pump, and various auxiliary pumps, valves, piping and sources of steam and whitewater. The method comprises mixing steam with contaminated fibrous stock in a mixing chamber to raise the pressure and temperature of the contaminated fibrous stock, mixing the contaminated fibrous stock with chemicals to promote emulsification of dispersed contaminants in the stock. The method further includes flowing the mixture of contaminated fibrous stock, steam and emulsifying chemicals through a venturi to apply cavitational fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.