Press of a paper machine for thin papers
AssigneeVoith Sulzer Papiermaschinen GmbH
InventorsKarl Steiner, Albrecht Meinecke, Rui Goncalves, Christian Schiel
Life of this patent
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Abstract
The press section of a paper machine for thin papers has the following characteristics: a pressing gap is formed by a rotary, smooth surface (1) in contact with the paper and by a felted pressing roll (3); the smooth surface (1) transfers the paper web downstream of the pressing gap to a heatable roll (4) without free pulling of the paper web. The invention is characterized in that the smooth surface (1) is the outer surface of a tubular roll with dimensionally stiff roll sleeve.
Claims10
A section of a paper machine including a first machine portion comprising at least a portion of a press section of the papermaking machine, a second machine portion comprising at least a portion of a drying section directly following the press section, and a web transfer arrangement defining a web transfer region located between the first portion and the second portion of the papermaking machine, in which:
- the press section comprises:
- a rotatable, smooth surfaced, first tubular roll having a roll shell which is rigid and having a smooth peripheral outer surface which contacts a paper web directly, a felted second press roll, the first roll and the second roll being positioned to define a first press nip between them through which the paper web passes, the first roll constituting the last and final roll of the press section and the first press nip constituting the last and final press nip of the press section;
- the press section being such that the paper web continues to traverse, past the first press nip, an unfelted portion of the first roll to the web transfer region;
- the second portion comprises:
- a leading, heated unfelted drying cylinder located adjacent the unfelted portion of the first tubular roll of the press section;
- and
- the web transfer arrangement between the first roll of the first portion and the drying cylinder of the second machine portion being such that the paper web is transferred directly from the first roll of the press section to the drying cylinder of the second machine portion without open draw, avoiding a free web path.
Dependencies are inferred from the claim text.