Pulp slurry-handling press roll and twin and single roll slurry handling presses
US5667642A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 8, 1996 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Feb 8, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F1/74
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A drum having a longitudinal axis, and an outer periphery, has a multiplicity of longitudinal, drainage grooves formed therein, and a cylindrical sheath encloses the drum, the sheath having a multiplicity of holes formed therein. The drum is imperforate. A pair of the drums is employed in a twin-roll press as press rolls, and one thereof is used in a single roll press with a compaction baffle. In one embodiment, the press roll has its grooves formed in a herringbone pattern, the same pointed in the direction of rotation, to enhance drainage. In another embodiment, the longitudinal drainage grooves have increasing depth, toward a mid-length of the press roll where they open into inner-drum drainage conduits which discharge the filtrate adjacent the rotary axis of the press roll.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.