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Method and device for treating a fibrous material web in a long nip pressing unit

A fiber material and long press zone technology, which is applied in lighting and heating equipment, press parts, textiles and papermaking, etc., can solve the problems of tearing production, low wet strength of fiber material web, interruption, etc., and achieve the effect of smooth operation

Active Publication Date: 2020-10-30
ANDRITZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Unsupported (open) transfer of fibrous webs with low sheet weights, i.e. below 50 g / m for oven-dried sheet weights in long-nip press units 2 , mainly less than 35g / m 2 , and usually less than 25g / m 2 In this case, the low wet strength of the fibrous web is very problematic and can easily lead to tears and production interruptions

Method used

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  • Method and device for treating a fibrous material web in a long nip pressing unit
  • Method and device for treating a fibrous material web in a long nip pressing unit
  • Method and device for treating a fibrous material web in a long nip pressing unit

Examples

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Embodiment Construction

[0044] figure 1 A tissue machine 2 with a pressing device according to the invention is shown.

[0045] The fiber suspension is fed to the forming unit via a headbox 22 where it leaves the headbox 22 between a breast roll 24 and a forming roll 23 . The breast roll 24 is wrapped by an outer clothing 25 . The fiber suspension is dewatered in the forming unit until the fiber web 1 is formed on the clothing 26 . The clothing 26 is preferably a felt which conveys the fibrous web 1 to a shoe press roll (press roll) 4 .

[0046] The press installation according to the invention comprises a long-nip press unit 3 with a press roll 4 and an opposing roll 6 with a surrounding press jacket 5 . An extended nip 7 is formed between the press roll 4 and the counter roll 6 .

[0047] Now, the pressing device according to the invention works in the following way:

[0048] The fibrous web 1 is guided through the extended nip 7 on the felt 26 . The felt 26 absorbs moisture from the fibrous ...

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Abstract

The present invention relates to a method for treating a fibrous material web (1) in a paper- or tissue-making machine (2) with a long nip pressing unit (3). This long nip pressing unit (3) consists of a shoe press roll (4) with a rotating press shell (5) and a counter roll (6), wherein the fibrous material web (1) is dewatered in the extended press nip (7) between the counter roll (6) and the press shell (5), and the fibrous material web (1), after the extended press nip (7), is guided over the rotating press shell (5) of the press roll (4) to a transfer clothing (9), which receives the fibrous material web (1). In accordance with the invention the transfer clothing (9) is guided via a fixed transfer device (10) in the transfer region (8). The invention further relates to a correspondingdevice for treating the fibrous material web (1).

Description

technical field [0001] The invention relates to a method for treating a fibrous web in a paper or tissue machine with a long-nip press unit. This long-nip press unit comprises a shoe press roll with a rotating press sleeve and an opposing roll, wherein the fibrous web is dewatered in an extended nip between the opposing roll and the pressing sleeve, and wherein the fibrous web is The nip is then guided on the rotating press sleeve of the shoe press roll to a transfer clothing which receives the fibrous web. The invention also relates to a pressing plant for carrying out the method according to the invention. Background technique [0002] In conventional methods for papermaking and tissue production, the fibrous web is mechanically dewatered by pressing the fibrous web directly against a drying cylinder (Yankee) before thermal drying. Such a production process is described in DE 102 33 920 A1. However, with these paper or tissue machines, there is a limit to the mechanical...

Claims

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Application Information

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IPC IPC(8): D21F1/52D21F2/00D21F3/02D21F3/04D21F11/00D21F11/14
CPCD21F3/0218D21F3/045D21F11/00F26B13/24D21F1/52D21F2/00D21F11/006D21F11/14D21F3/0227D21F7/12D21H27/002
Inventor 安德烈亚斯·安泽尔罗伯特·迈特纳保罗·理查德斯沃尔夫冈·普利纳格
Owner ANDRITZ AG