EP 2531649 B1 20141008 - HEADBOX AND SHEET-FORMING UNIT COMPRISING A HEADBOX
Title (en)
HEADBOX AND SHEET-FORMING UNIT COMPRISING A HEADBOX
Title (de)
STOFFAUFLAUF UND BLATTBILDUNGSEINHEIT MIT EINEM STOFFAUFLAUF
Title (fr)
CAISSE DE TETE ET UNITE DE FORMATION DE FEUILLE COMPRENANT UNE CAISSE DE TETE
Publication
Application
Priority
- DE 102010001615 A 20100205
- EP 2011051647 W 20110204
Abstract (en)
[origin: WO2011095587A1] The invention relates to a headbox (1) comprising at least one feeding device (5) feeding at least one fibrous material suspension (FS), a nozzle (4) having an outlet gap (11) for dispensing the fibrous material suspension (FS) in a free jet and a turbulence-generating device (6) arranged directly upstream of the nozzle (4) in the flow direction. During operation of the headbox (1), the at least one fibrous material suspension (FS) is guided in partial flows through a plurality of turbulence-generating channels (7, 7.xy, 7.11 -7.4n), at least one region forming a fluidization region (12, 12.11 -12.31) being provided inside each individual turbulence-generating channel (7, 7.xy, 7.11 -7.4n). The headbox (1) according to the invention is characterized in that the nozzle (4) has a length (L) which is a function of the size of the proportional surface of the cross-sectional surface at the inlet of the nozzle, which proportional surface is associated with an individual turbulence-generating channel and represents a dividing surface (BT): L = k ° vBT, wherein L is the length of the nozzle (4); k is a constant, with 10 = k = 20; and BT is the dividing surface.
IPC 8 full level
D21F 1/02 (2006.01)
CPC (source: EP)
D21F 1/02 (2013.01); D21F 1/026 (2013.01); D21F 1/028 (2013.01)
Designated contracting state (EPC)
AL 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 RS SE SI SK SM TR
DOCDB simple family (publication)
DE 102010001615 A1 20110811; CN 102753754 A 20121024; CN 102753754 B 20160316; EP 2531649 A1 20121212; EP 2531649 B1 20141008; WO 2011095587 A1 20110811
DOCDB simple family (application)
DE 102010001615 A 20100205; CN 201180009224 A 20110204; EP 11702220 A 20110204; EP 2011051647 W 20110204