Method and apparatus for producing a fibrous web
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United States of America Patent
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Jul 27, 2010
Grant Date -
May 3, 2007
app pub date -
Oct 27, 2006
filing date -
Oct 28, 2005
priority date (Note) -
Expired
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Abstract
Disclosed is a method for producing a fibrous web, in particular a paper web, paperboard web or tissue web, with which a material flow of higher consistency and a material flow of lower consistency are mixed in a variable ratio over the machine width and the mixed flow is fed via a headbox as a headbox stream to a mesh section, whereby the mixing ratio between these two material flows of different consistency in the respective mixed flow acts as the set-point variable for controlling the gsm substance of the fibrous web over the machine width. In this case the ratio between the fibrous material content and the filler material content in the material flow of lower consistency is established or controlled such that the filler material fraction in the fibrous web can be established or controlled at least essentially independently of the gsm substance.
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