Title:
パルプウェブ形成方法および装置
Document Type and Number:
Japanese Patent JP4523166
Kind Code:
B2
Abstract:
The invention relates to a method and an apparatus for pulp web formation. The method comprises feeding pulp, having a dry content of about 1,5 %, from a headbox (2) into a wedge-shaped converging space (5) defined by two wires (3, 4) or the like, said wires or the like being supported on chamber units (6, 7), including at a given time at least one water-receiving chamber (8), having its pressure adjustable in such a way that the pulp can be maintained at an overpressure in the space (5). The method comprises increasing the dry content of the pulp in the converging space (5) to a value which is at least about 10 % to about 12 %. According to the invention, the method comprises subjecting the pulp present between the wires (3, 4) or the like in the downstream section of the converging space, or in its substantially immediate vicinity, to a compression in perpendicular direction (z direction). In the method, the compression performed in the vicinity of the converging space (5) or its downstream section is used for increasing the dry content of the pulp to a value which is at least about 18 %, preferably to a value which is about 20 %.
Inventors:
Liszt Savia
Yorma Koskinen
Leo Lunden
Food Markerkankanen
Ilkka Pakkara
Yorma Koskinen
Leo Lunden
Food Markerkankanen
Ilkka Pakkara
Application Number:
JP2000584137A
Publication Date:
August 11, 2010
Filing Date:
November 24, 1999
Export Citation:
Assignee:
METSO PAPER, INC.
International Classes:
D21F9/02; D21F1/00; D21F1/48; D21F9/00
Domestic Patent References:
| JP11508334A | ||||
| JP47035210A | ||||
| JP11504996A | ||||
| JP55001392A | ||||
| JP1162891A | ||||
| JP57112495A |
Foreign References:
| US3823062 |
Attorney, Agent or Firm:
Aoyama Aoi
Yasumichi Furukawa
Atsushi Maeda
Yasumichi Furukawa
Atsushi Maeda