Machines for manufacturing and/or processing fibrous webs

Abstract

A machine for the manufacture and / or treatment of a fibrous web, in particular a paper or cardboard web, with a press section and a dryer section arranged after the press section in the running direction of the web, wherein the press section has a pass through upper and the last press nip formed with the lower press roll, through which the fibrous web is guided between the upper and lower blankets of the last press nip; the penultimate press nip before the press nip through which the fiber web is guided between the upper and lower dewatering belts, especially the press felt, of the penultimate press nip, Therein, the fiber web is guided from the last press nip all the way to a take-up position on the lower blanket of the last press nip, and at this take-up position is transferred from the lower blanket to the first drying group of the dryer section. a drying screen, wherein the fibrous web has a dryness of at least 38%, preferably at least 45%, particularly preferably at least 50%, before entering the last press nip, and the lower press roll has a larger diameter than the upper press roll, and Wherein, the upper blanket of the last press nip is designed as a dewatering belt, and the lower blanket of the last press nip is designed as a substantially impermeable conveyor belt, and the upper blanket is designed along the web after leaving the last press nip The running direction partially surrounds the lower pressure roller.

Description

technical field [0001] The invention relates to a machine according to the preamble of claim 1 for producing and / or processing fibrous webs, in particular paper or cardboard webs. The invention also relates to a machine for producing and / or processing a fibrous web with a press section including a conveyor belt and with a device for adjusting the conveyor belt according to claim 27 . Background technique [0002] For example, for the manufacture of coated papers, raw papers (Rohpapière) with low roughness and high density are required. A density that is too low leads, for example, in combination with high porosity, to the penetration of the applied color. [0003] In addition, the paper used for coating and subsequent printing must have a high tear strength, since here high normal forces act on the paper surface. [0004] The paper or board machines known from the prior art often have the advantage that the paper produced or processed by them does not have sufficient tear ...

AI Technical Summary

Problems solved by technology

Here, the solutions disclosed in the prior art have proven to be problematic, namely that it is difficult to guide and divide the fiber web after the last press nip

This often results in web tears and production interruptions

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