Title:
ADJUSTABLE ACTIVITY DRAINAGE BOX
Document Type and Number:
WIPO Patent Application WO2002033167
Kind Code:
A3
Abstract:
A process, and an apparatus, for improving sheet properties in the initial impingement zone of a paper making machine including a forming section, a forming fabric moving in the machine direction and a head box having a head box slice which delivers a stock jet onto the moving forming fabric. The scale and intensity of agitation within the stock is adjusted by moving some of the support elements beneath the forming fabric adjacent the head box slice so that they either contact, or do not contact, the machine side surface of the forming fabric. This technique is of use in a papermaking machine forming section having a single open surface forming fabric, in the initial open surface section of a so-called hybrid gap former having two superposed forming fabrics, and in the forming section of a two fabric papermaking machine.
Inventors:
VAN ESSEN ROY (CA)
LANDRY MARK (US)
PITT RICHARD (CA)
LANDRY MARK (US)
PITT RICHARD (CA)
Application Number:
PCT/CA2001/001446
Publication Date:
June 20, 2002
Filing Date:
October 15, 2001
Export Citation:
Assignee:
VAN ESSEN ROY (CA)
LANDRY MARK (US)
PITT RICHARD (CA)
LANDRY MARK (US)
PITT RICHARD (CA)
International Classes:
D21F1/52; D21F1/00; (IPC1-7): D21F1/00
Domestic Patent References:
| WO1990015188A1 | 1990-12-13 | |||
| WO1999066121A1 | 1999-12-23 |
Foreign References:
| US4140573A | 1979-02-20 |
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