Dryer section in a paper machine in which impingement and/or ventilation hoods are used
US6101735A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1998 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Apr 22, 2018 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F5/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A dryer section of a paper machine including groups with single-wire draw that include a drying wire guided in a loop and reversing cylinders arranged in the drying-wire loop. Contact drying cylinders are arranged in gaps between the reversing cylinder and the drying wire is guided to press a web against heated faces of the contact drying cylinders. In addition to normal, small-diameter contact drying cylinders, one or more large-diameter contact drying cylinders (the diameter being greater than about 2200 mm and usually in a range from 2200 mm to 3600 mm), is/are used in one or more single-wire draw groups. An impingement-drying/ventilation hood is arranged above the large-diameter contact drying cylinders and extends on a large sector above the contact drying cylinder and above the drying wire and the web running over the cylinder. An impingement-drying/ventilation effect is applied to the drying wire through the impingement-drying/ventilation hoods on the large sector. By means of the effect, a moist boundary layer in contact with the drying wire is disintegrated and drying is promoted from a side of a face of the web opposite to the web face that is placed against the contact d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.