Global Patent Index - EP 2379802 A1

EP 2379802 A1 20111026 - HEADBOX FOR A MACHINE FOR PRODUCING A FIBROUS WEB

Title (en)

HEADBOX FOR A MACHINE FOR PRODUCING A FIBROUS WEB

Title (de)

STOFFAUFLAUF FÜR EINE MASCHINE ZUR HERSTELLUNG EINER FASERSTOFFBAHN

Title (fr)

CAISSON DE TÊTE POUR MACHINE DE FABRICATION D'UNE BANDE DE MATIÈRE FIBREUSE

Publication

EP 2379802 A1 20111026 (DE)

Application

EP 09740883 A 20091022

Priority

  • EP 2009063836 W 20091022
  • DE 102008054899 A 20081218

Abstract (en)

[origin: WO2010069648A1] The invention relates to a headbox (1) which comprises a feed device (4, 5) feeding the at least one fiber suspension (2), a perforated distribution pipe plate (6) arranged immediately downstream thereof and having a plurality of channels (7) arranged in lines (Z) and columns (S), an intermediate channel (8) arranged downstream thereof, extending over the width (B) of the headbox (1) and having a plurality of means (9) for dosing a fluid (10) in partial fluid streams (10.T) to the at least one fiber suspension (2) in a preferably adjustable/controlled manner, the means (9) being spaced apart from each other in the width direction of the headbox (1) and the individual means (9; 9.1) comprising a plurality of dosing channels (11) having respective dosing channel openings (11.1) on the outlet side and a dosing channel length (11.L), arriving at different levels and being connected to a common supply channel (12). The headbox further comprises a downstream turbulence generator (13) having a plurality of flow channels (14) arranged in lines (Z) and columns (S) and a headbox nozzle (16) which is directly contiguous to the turbulence generator (13) and which has a nozzle gap (17). At least some sections of the channels of the perforated distribution pipe plate (6) have a diffuser (20) and the perforated distribution pipe plate has a length (L) which is = 0.5 · vparting surface (I), TF being the surface of the downstream perforated distribution pipe plate divided by the total number of the channels of the perforated distribution pipe plate (II).

IPC 8 full level

D21F 1/02 (2006.01)

CPC (source: EP)

D21F 1/02 (2013.01); D21F 1/022 (2013.01)

Citation (search report)

See references of WO 2010069648A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DOCDB simple family (publication)

DE 102008054899 A1 20100624; CN 102216522 A 20111012; EP 2379802 A1 20111026; US 2011303381 A1 20111215; US 8303774 B2 20121106; WO 2010069648 A1 20100624

DOCDB simple family (application)

DE 102008054899 A 20081218; CN 200980145406 A 20091022; EP 09740883 A 20091022; EP 2009063836 W 20091022; US 201113163271 A 20110617