A tissue papermaking machine and a method of manufacturing a tissue paper web

Abstract

A tissue papermaking machine is described, comprising a wet section (2) and a press section (3) comprising a single press (11) with first and second press elements (12, 13) forming a press nip (N1), and with a press felt (17) running through the press nip in contact with the formed fibre web (1'), whereby the second press element is arranged inside the loop of the press felt, and a smooth belt (14) runs through the press nip in contact with the formed fibre web, whereby the first press element is arranged inside the loop of the belt, and a transfer roll (16) arranged inside the loop of the belt forming a transfer nip (N2) with a drying surface (20), whereby the smooth belt carries the fibre web between the press nip and the transfer nip. Furthermore, the machine has a dry section (4) for final drying of the fibre web (1''). According to the invention, a pre-dewatering device (25) is arranged upstream of the press to dewater the fibre web to a dry content of 15-30%, before the fibre web runs into the press nip, and the press felt and the smooth belt, which is impermeable to water, are arranged to be separate from each other immediately after the exit of the press nip and define there between an angle a, which is at least 5 DEG , to prevent rewetting of the fibre web. The invention also relates to a method of manufacturing a tissue paper web therein and a method of lowering the energy requirement therein.

Description

technical field [0001] The invention relates to a tissue papermaking machine for making a tissue paper web, the tissue papermaking machine comprising: [0002] - a wet end for forming a fibrous web, [0003] - a press section for pressing said fibrous web, said press section comprising: [0004] - a single press comprising: [0005] - a first press unit; [0006] - second press elements forming a press nip between them at a predetermined pressure; [0007] - a press felt running in an endless circuit around a plurality of guide rolls and passing through said press nip together with the fibrous web being formed and in contact with the fibrous web, said second press member being arranged on said press felt the inner side of the loop; [0008] - a smooth belt running in an endless circuit around a plurality of guide rolls and passing through said press nip and in contact with the fibrous web with the formed fibrous web, said first press member being arranged in the circuit o...

AI Technical Summary

Problems solved by technology

However, this solution has the disadvantage of making it difficult for the machine to produce a thin fibrous web since each press nip that the thin fibrous web must pass through adversely affects the loft by creating more fiber bundles in the web sufficient bulk (i.e., thickness) and make it difficult to obtain a final product of the desired quality

Images