Global Patent Index - EP 1005588 A1

EP 1005588 A1 2000-06-07 - APPARATUS AND METHOD OF GENERATING STOCK TURBULENCE IN A FOURDRINIER FORMING SECTION

Title (en)

APPARATUS AND METHOD OF GENERATING STOCK TURBULENCE IN A FOURDRINIER FORMING SECTION

Title (de)

VORRICHTUNG UND VERFAHREN ZUR ERZEUGUNG VON STOFFTURBULENZ IM BLATTBILDNER EINER LANGSIEBPAPIERMASCHINE

Title (fr)

APPAREIL ET PROCEDE DE PRODUCTION DE TURBULENCES DE PATE DANS UNE SECTION DE MISE EN FEUILLE A TABLE PLATE

Publication

EP 1005588 A1 (EN)

Application

EP 99926201 A

Priority

  • CA 9900573 W
  • US 9935698 A
  • US 29089899 A

Abstract (en)

[origin: WO9966121A1] A method and apparatus for generating turbulence in stock to deflocculate the stock in an open surface forming section of a paper making machine comprises a dewatering box (2) providing vacuum assisted drainage and which has a set of dewatering elements that impart turbulence into relatively thick stock layers carried at machine operating speeds of equal up to about 400 m/min, for the production of paper products having a basis weight generally in excess of about 160 gsm. Each set of elements includes a lead-in element (5), at least one intermediate element (6, 7), and a trailing element (8). The path of the forming fabric (13) is deflected downwardly as it passes over the intermediate elements, which are inclined at an angle of from about 0 DEG to about 10 DEG from a plane defined by forming fabric supporting surfaces on the lead-in and riser elements. This vertical movement initiates turbulence and agitation in the stock, which acts both to deflocculate the stock and to diminish the possibility of sheet sealing. The apparatus is useable in combination with other known formation and drainage devices which are located either upstream or downstream to augment their performance with thicker, slower moving stock layers.

IPC 1-7 (main, further and additional classification)

D21F 1/20; D21F 1/48

IPC 8 full level (invention and additional information)

D21F 1/20 (2006.01); D21F 1/48 (2006.01)

CPC (invention and additional information)

D21F 1/483 (2013.01); D21F 1/20 (2013.01)

Citation (search report)

See references of WO 9966121A1

Designated contracting state (EPC)

AT DE ES FI FR GB IT NL PT SE

EPO simple patent family

WO 9966121 A1 19991223; AT 258249 T 20040215; AU 4354899 A 20000105; AU 745683 B2 20020328; BR 9906541 A 20001017; BR 9906541 B1 20090113; CA 2300280 A1 19991223; CA 2300280 C 20070911; DE 69914295 D1 20040226; DE 69914295 T2 20040701; EP 1005588 A1 20000607; EP 1005588 B1 20040121; ES 2212563 T3 20040716; NO 20000778 A 20000414; NO 20000778 D0 20000217; NO 315570 B1 20030922; NZ 502363 A 20010727; PT 1005588 E 20040531; RU 2224062 C2 20040220

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