Method and machine for producing a paper web that is smooth on one side

Abstract

The invention relates to a method to manufacture a fibrous web in the form of a paper web, which is smooth on one side, by a papermaking machine having a forming area (14), a pressing area (16) and a drying area (18). The method including picking up the paper web (12) from the forming area by a water absorbent first press felt; guiding the paper web (12) together with the first press felt (20) and a smooth transfer belt (26) through a first press nip. The smooth transfer belt is configured to substantially not absorb any water. The first press nip being a part of the pressing area. The first press felt (20) being configured to be separated and led away from the paper web (12) immediately after the first press nip. The method further including the steps of leading the paper web together with the smooth transfer belt away from the first press nip; and subsequently leading the paper web from the smooth transfer belt by way of a conditioned water absorbent second press felt (30), the second press felt not passing through the first press nip (28); and subsequently guiding the paper web together with the second press felt through a second press nip (32), the second press nip being associated with the drying area (18).

Description

technical field [0001] The present invention relates to a machine and method for producing a single-sided smooth paper web. Background technique [0002] At present it is customary to manufacture on so-called MG machines (MG = smoothing machine) with a weight per unit area of ​​20 g / m 2 to 80g / m 2 between, especially at 16g / m 2 to 40g / m 2 A smooth, one-sided paper web in between. Here, the web with a relatively low dry weight content is conveyed by means of a press roll to a smooth or Yankee cylinder. However, the production efficiency of such machines is limited by the evaporation efficiency of the drum and the hood associated with the drum. Although wet pressing prior to the levelling drum is already known. However, closed web guidance is required here due to the low basis weight. Therefore, the press is double felted in this case, whereupon the achievable dry weight content is limited by remoisturization. [0003] In a method and a machine of the type described at...

AI Technical Summary

Problems solved by technology

[0004] In a method and a machine of the type mentioned at the outset, known from DT 24 43 099 A1, the paper web to be produced is moved on the felt after the first press nip, which in turn leads to undesired remoistening

Furthermore, it is disadvantageous that there is no web guidance supported by tensioning elements (Bespannung) in the press area

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