Turbines for fiber separation
US4607802A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1984 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Apr 11, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21B1/347
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a primary pulper turbine for processing recycled paper, of the type having the general shape of an helix. This turbine is formed of a shaft (2) carrying at least two helical disks (3, 4) coaxial to the shaft (2) and having a small pitch. These disks extend over at most 360.degree. and are spaced from each other along the shaft (2) by a distance of at least 1.5 times the helical pitch of a disk. The turbine carries on its base a set of radially extending fins (6, 7, 8), each one of which is curved into a spiral starting from the shaft (2). Preferably, the slant of the helical disks (3, 4, 5) relative to a plane perpendicular to the shaft (2) is approximately 15.degree., and the disks are angularly spaced from each other by a same angle approximately equal to 360.degree. divided by the number of disks, for providing a proper dynamic balance of the turbine. The turbine of the invention is designed so as to have a high separation power for fibers, and to separate contaminants, such as plastics, from the paper pulp, without breaking them up into small pieces. This design lends itself to the building of small efficient primary pulpers, the volume of which may be …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.