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Pressing apparatus for a paper- or board-making machine for removing fluids from a web by pressing, and a method for treating a web in a paper- or board-making machine

A technology of paper machine and board machine, applied in the direction of paper machine, paper making, pressing part, etc., can solve the problems of paper machine or board machine operation efficiency reduction, pressure loss, pressurized medium leakage, etc., achieve excellent operating characteristics, improve processing Pressure, improve the effect of dehydration

Inactive Publication Date: 2010-07-14
VALMET CHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the operation of the whole paper or board machine less efficient
[0010] On the other hand, if the gap is made large to avoid such contact and thereby improve the wear resistance of the above-mentioned parts, most of the pressurized medium will leak through the gap
This causes a large pressure loss in the pressurized chamber
Consequently, the pressure in the pressurized chamber is limited to low pressure, whereby the web cannot be sufficiently dewatered along the nip

Method used

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  • Pressing apparatus for a paper- or board-making machine for removing fluids from a web by pressing, and a method for treating a web in a paper- or board-making machine
  • Pressing apparatus for a paper- or board-making machine for removing fluids from a web by pressing, and a method for treating a web in a paper- or board-making machine
  • Pressing apparatus for a paper- or board-making machine for removing fluids from a web by pressing, and a method for treating a web in a paper- or board-making machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] figure 1 A sectional view of a first embodiment of a pressing plant according to the invention is shown, taken in the transverse direction of the plant. The press is used in a paper or board machine to remove fluid from a web by pressing.

[0055] In this press apparatus, a nip is formed between a loading device (pressing device) 1 and a press roll 2 . The loading device 1 comprises at least one pressurized chamber 30 (see figure 2 ), the pressurized chamber 30 contains a pressurized fluid (medium) such as water, water with additives, oil or air, to bear against the metal band 20 which is fluid impermeable and formed as an annular ring (see figure 2 ). The loading device 1 extends along the length of the nip in the direction of web movement, i.e. from figure 1 and figure 2 The left side in extends to the right side.

[0056] Furthermore, the press roll 2 has inside it a support 3 to transmit and carry the load applied by the pressurized fluid in the loading dev...

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Abstract

A pressing apparatus for a paper- or board-making machine for removing fluids from a web (W) by pressing comprises at least one belt which guides the web. The belt (20) is impervious to fluids and forms an endless loop. At least one nip is formed between a press roll (2) and a pressure means (1) of the pressing apparatus. The guided web is arranged to pass through the nip. The pressure means comprises at least one pressure chamber containing a pressure medium and extending along the length of the nip in the web moving direction such that the pressure medium directly contacts the belt. The pressure chamber has a pressure-operated sealing member (40) which cooperates with the belt, and the sealing operating pressure is adjusted in accordance with the pressure acting in the pressure chamber.

Description

technical field [0001] The present invention relates to a press apparatus of a paper or board machine for removing fluid from a web by pressing, which press apparatus can also be used for pulp and tissue paper, and to a method for treating a web in a paper or board machine material method. Background technique [0002] It is generally known that in the press section of a paper or board machine a paper or board web can be dewatered by passing the web through a nip defined by two rolls facing each other. One or two press fabrics pass through the dewatering nip, carrying away the water pressed from the web, and the press fabrics are also used to transport the web to and from the press nip. [0003] Dewatering the web in the press section is the main area to be improved. Since the nip defined by a pair of rollers has a relatively short active area in the direction of web movement, the time spent in the nip by a web moving at high speed is relatively short. However, a minimum ...

Claims

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Application Information

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IPC IPC(8): D21F3/02
CPCD21F3/045
Inventor 里库·皮赫科于尔基·萨韦拉
Owner VALMET CHINA CO LTD
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