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US 6,257,133 B1Granted
Method and apparatus for controlling cross directional nip dynamics
AssigneeInternational Paper Company
InventorD. W. Anderson
Life of this patent
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AssigneeInternational Paper Company
InventorD. W. Anderson
Estimating the term…
A method and apparatus for obtaining a desired nip pressure distribution profile in the cross direction of a paper web. The paper web passes through a nip, the latter defined by at least one elastomer covered roll, the covered roll having polarizable particles or magnetic particles embedded therein. A plurality of spaced plates or spaced coils each generate a local field (respectively electric or magnetic) which acts upon individual spaced zones or regions along the covered roll. The field may thus be an electric field or a magnetic filed. The affect of the field is to change the effective modulus of the elastomer by acting on the particles. In turn, this action varies the nip pressure pulse as to exert a desired pressure at each of a plurality of spaced zones or regions on the paper web, to thus create or process a more uniform product in the nip. The method and apparatus can be used, for example, to improve web moisture profiles in the press section of paper machines.
An apparatus for varying the effective modulus of an elastomer cover of a roll for a papermaking machine, wherein said modulus may be varied either locally along the width of said roll or varied uniformly along the width of said roll, a nip including at least one said roll, said nip adapted to pass a paper web therethrough, means for locally changing the effective modulus of said cover at either width-wise spaced regions of said roll or uniformly across the entire width of said roll, whereby a desired nip pressure profile in the cross direction of a paper web can be obtained.
An apparatus for varying the effective modulus of an elastomer roll of a papermaking machine, wherein said modulus may be varied either locally along the width of said roll or varied uniformly along the width of said roll, a nip including at least one said roll, said nip adapted to pass a paper web therethrough, means for locally changing the effective modulus of said elastomer roll at either width-wise spaced local regions of said roll or uniformly across the entire width of said roll, whereby a desired nip pressure profile in the cross direction of a paper web can be obtained.
Dependencies are inferred from the claim text.