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Method and device for treating a strip of fibrous material in a long nip press unit

A technology with long nip and pulp width, applied in the press part, textile and papermaking, papermaking, etc., can solve the problems of mechanical pressing and line load limitation, and achieve the effect of good quality performance and good pulp width transfer

Active Publication Date: 2010-11-24
ANDRITZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these paper and tissue machines, the achievable mechanical press and line load are limited by the pressure that is applied to the Yankee dryer

Method used

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  • Method and device for treating a strip of fibrous material in a long nip press unit
  • Method and device for treating a strip of fibrous material in a long nip press unit
  • Method and device for treating a strip of fibrous material in a long nip press unit

Examples

Experimental program
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Embodiment Construction

[0033] figure 1 A conventional tissue machine utilizing shoe press technology is shown. The stock suspension is conveyed through the head box 1 to the forming unit and leaves the head box 1 between the breast roll 4 and the forming roll 5 . The outer fabric 2 is wrapped around a breast roll 4 . In the forming unit, the stock suspension is sufficiently dewatered so that a stock web 9 is formed on the fabric 3 . The fabric 3 is preferably a felt, which brings the pulp web 9 to the shoe press roll 6 . An extended press nip is formed between the shoe press roll 5 and the Yankee cylinder 7 , in which nip the pulp web is mechanically dewatered and transferred to the Yankee cylinder 7 . The thermal drying of the pulp web 9 is carried out on the Yankee cylinder 7 . A doctor blade 8 separates a dry pulp web 9 from the Yankee cylinder 7 . Due to the direct pressing of the pulp web 9 onto the Yankee cylinder 7, mechanical dewatering is limited because the shoe press roll 6 cannot be...

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PUM

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Abstract

The invention relates to an apparatus and a method for treating a fibrous material web (9) in a paper or cardboard machine in a long nip press unit (29) comprising a press roll (24), which has a rotating press jacket (25) and a mating roll (23), wherein the fibrous material web (9) is dewatered in an extended press nip (26) between the mating roll (23) and the press jacket (25) of the press roll (24). According to the invention, the fibrous material web (9) is guided after the extended press nip (26) on a special rotating press jacket (25) of the press roll (24) to a transfer region (30), in which the fibrous material web (9) is transferred from the press jacket (25) to a transfer element (31, 27). The invention also relates to a pressing apparatus and a method for implementing the same.

Description

technical field [0001] The invention relates to a method for treating a pulp web in a paper or board machine in a long-nip press unit having a press roll with a rotating press shell and an opposing roll, wherein The pulp web is dewatered in the extended press nip between the counter rolls and the press shell of the press rolls. The invention also relates to a pressing device with which the method according to the invention is carried out. Background technique [0002] In conventional paper and tissue production processes, the mechanical dewatering of the pulp web prior to thermal drying is carried out by pressing the pulp web directly onto drying cylinders (Yankee cylinders). A production process of this type is described in DE 102 33 920 A1. However, in these paper and tissue machines, the achievable mechanical press and line load are limited by the pressure that is applied to the Yankee cylinder. With the preceding pressing stage, mechanical dewatering is carried out in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F3/02D21F3/04D21F3/08
CPCD21F3/045D21F3/0227D21F11/006
Inventor 威廉·莫塞安德烈亚斯·安热尔哈拉尔德·韦冈特戴夫·朗格
Owner ANDRITZ AG
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