Method of and apparatus for removing liquid for webs of porous material
US4556450A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1982 |
| Grant date | Dec 3, 1985 |
| Priority date | — |
| Expiry date | Dec 30, 2002 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F3/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for removing water or other liquids from webs of such porous materials as fibrous paper webs coursing through a papermaking machine without substantially compacting the webs. The web which may be coherent or perforate passes over a sector of a cylinder having preferential-capillary-size pores through its cylindrical-shape porous cover. Preferably, the porous cover comprises hydrophilic material which is substantially non-resilient and which renders the surfaces of the porous cover wettable by the liquid of interest. A portion of the interior of the cylinder may be subjected to a controlled level of vacuum to effect pneumatically augmented capillary flow of liquid from the web; and another portion of the cylinder may be subjected to pneumatic pressure for expelling the transferred liquid outwardly through a portion of the porous cover which is not in contact with the web. The method may comprise controlling the level of vacuum as a function of air flow to maximize liquid removal from a web while substantially obviating air flow through the capillary-size pores of the porous cover of the cylinder. Preferential-capillary-size pores are such that, relative to the pores of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.