Title:
【発明の名称】繊維懸濁液をスクリーニングする方法と装置
Document Type and Number:
Japanese Patent JP2809514
Kind Code:
B2
Abstract:
The differences in performance of a screening cylinder during screening of a fiber suspension (e.g. low consistency paper pulp) at the inlet end compared to the reject end is accommodated by constructing the feed side surface of the screening cylinder so that it induces greater turbulence in the vicinity of the screen cylinder surface adjacent the reject end of the screen than adjacent the inlet end. Typically this increase in turbulence is at least about 10% (preferably at least about 40%, and typically greater than 100%). The turbulence increase can be provided by a substantially smooth screening medium surface at the inlet end and a contoured screening medium surface adjacent the reject end, or by first and second contoured surfaces of different aggressiveness. Contoured surfaces typically include grooves, and variables that may be changed to affect the turbulence include the depth of the grooves, the angle of inclination of the downstream wall of the grooves, the spacing between the grooves, the radius of curvature of the opening (holes or slots) edges, the frequency of openings in grooves, and the dimensions of the openings (holes or slots) in the grooves. The screen cylinder is mounted in a pressure screen housing.
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Inventors:
AARUTONEN FURANKU
FUREYUBORUGU FUREI
FUREYUBORUGU FUREI
Application Number:
JP50622896A
Publication Date:
October 08, 1998
Filing Date:
July 28, 1995
Export Citation:
Assignee:
SHII EE II SUKURIINPUREITSU OY
International Classes:
B01D29/25; B01D29/35; D21D5/02; D21D5/06; D21D5/16; (IPC1-7): D21D5/16; B01D29/25; D21D5/02; D21D5/06
Domestic Patent References:
| JP536552B2 |
Attorney, Agent or Firm:
Akira Asamura (3 outside)