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US 2007/0095495 A1Published application
Method and apparatus for producing a fibrous web
AssigneeVoith Patent GmbH
InventorsJorg Reuter, Thomas Jaschinski
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AssigneeVoith Patent GmbH
InventorsJorg Reuter, Thomas Jaschinski
Estimating the term…
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.
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 divided among respectively shared sections over the machine width and the material flows of each section then mixed in a variable ratio to each other and the respective mixed flow 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 transverse profile of the gsm (grams per square meter) substance of the fibrous web, wherein the ratio between the fibrous material content and the filler material content in the material flow of lower consistency is at least one of established and controlled prior to its division such that the filler material fraction in the fibrous web can be established or controlled at least essentially independently of the gsm substance.
Apparatus for producing a fibrous material web, having means for dividing a material flow of higher consistency and a material flow of lower consistency among respectively shared sections over the machine width and means for mixing the two material flows of different consistency in each section in a variable ratio, whereby the respective mixed flow can be fed via a headbox as a headbox stream to a mesh section, and having means for controlling the gsm (grams per square inch) substance of the fibrous web over the machine width using the mixing ratio between the two material flows as a set-point variable, wherein the ratio between the fibrous material content and the filler material content in the respective material flow of lower consistency can be at least one of established and controlled prior to its division such that the filler material fraction in the fibrous web can be established or controlled at least essentially independently of the gsm substance.
Dependencies are inferred from the claim text.