METHOD FOR OPERATING A SHEET-FORMING UNIT, AND SHEET FORMING UNIT

A sheet forming unit including a headbox with at least one feed device, a turbulence generating device having a plurality of turbulence generating channels and a nozzle. The nozzle includes an outlet gap located downstream from the headbox forming a line of impingement in a flow direction. Immediate...

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Bibliographic Details
Main Authors RUEHL THOMAS, RUF WOLFGANG, HAEUSSLER MARKUS, LOSER HANS, SCHMIDT-ROHR VOLKER
Format Patent
LanguageEnglish
Published 25.04.2013
Subjects
METHODS OF PRODUCING PAPER THEREON
PAPER-MAKING
PAPER-MAKING MACHINES
PRODUCTION OF CELLULOSE
TEXTILES
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Summary:A sheet forming unit including a headbox with at least one feed device, a turbulence generating device having a plurality of turbulence generating channels and a nozzle. The nozzle includes an outlet gap located downstream from the headbox forming a line of impingement in a flow direction. Immediately upstream from the nozzle is the turbulence generating device in which during operation of the headbox a fibrous stock suspension passes through the plurality of turbulence generating channels in partial flows. Inside a turbulence generating channel there is a final fluidization region in which a pressure loss is produced in the partial flow of fibrous stock suspension in the turbulence generating channel. The headbox and the forming unit are arranged so that a dwell time of the fibrous stock suspension from the final fluidization region to the line of impingement on the clothing is >=30 ms to @300 ms.
Bibliography:Application Number: US201213713128