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Method of and equipment for manufacturing a fibrous web formed at high consistency

A technology for manufacturing fibers and fiber webs, used in papermaking, papermaking, textiles, and papermaking, etc., and can solve problems such as uniform fiber distribution and difficulty in forming properly oriented webs

Inactive Publication Date: 2011-06-29
METSO PAPER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the even distribution and proper orientation of fibers in existing high-concentration forming techniques is more difficult than conventional web forming

Method used

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  • Method of and equipment for manufacturing a fibrous web formed at high consistency
  • Method of and equipment for manufacturing a fibrous web formed at high consistency
  • Method of and equipment for manufacturing a fibrous web formed at high consistency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] FIG. 1 shows a possible embodiment of a pressure and heat treatment device for forming a fibrous web W. As shown in FIG. This embodiment comprises a belt calender 1 having a metal belt 2 extending around a plurality of guide rollers 3, at least one of which is adapted to movably adjust the tension or tension of the belt 2 . The forming belt 2 runs through rollers 5 and forms a pressurized and heat-treated zone N between the belt 2 and the rollers 5 . The fibrous web W to be formed travels through the pressure and heat treatment zone N while being formed under pressure momentum and temperature as a function of time. The belt 2 can be heated or cooled by the heating / cooling device 6 . The dotted line 9 in Figure 1 shows the pressure that develops when the press roll 4 is mounted inside the loop made of the forming belt 2, the roll 4 acting as a pressing element and pressing the belt 2 against the roll 5 is applied Greater pressure is provided in the nip of the press an...

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Abstract

The invention relates to a method of and equipment for manufacturing a fibrous web, comprising the formation of at least one layer of fibrous web from stock with a solids content of over 1.5%, water being removed from the said fibrous web by first pressing the fibrous web to a solids content of about 45 to 65%, then evaporating the fibrous web to a solids content of about 75 to 95%, after which the fibrous web is treated by means of a pressing contact to increase its smoothness, the fibrous web being treated in the manufacturing process before the reeling stage by at least one pressure and heat treatment, wherein the forming pressure exerted on the fibrous web is not higher than 20MPa. In the pressure and heat treatment process, the fibrous web is treated in the machine direction at least once to improve the smoothness of the fibrous web surface at three stages so that, at the first stage, the fibrous web is preheated, at the second stage, the actual pressing is carried out, smoothening the surface of the fibrous web and, at the third stage, the fibrous web is subjected to a stabilizing post-treatment.

Description

technical field [0001] The invention relates to a method for producing a fibrous web and also to a device for producing a fibrous web. Background technique [0002] In currently used wet web forming techniques, a fibrous web is converted into a web from a pulp formed from water and fiber slurry, typically having a solids content of about 0.5% to 1%. However, web forming, known as High Consistency (HC) web forming, occurs at a solids content of about 1% to 5%, mainly at a solids content of 2% to 4%. In principle, the pulp to be formed may comprise virgin fiber or recycled pulp, or both. [0003] For prior art HC web forming, reference is made to the publication WO 2004 / 022844A1, where the high consistency pulp is conveyed symmetrically on two wires, after which the two layers of pulp are pressed against each other in a pre-press nip, To provide a single fiber web. Through this operation, a space-saving processing concept and a very symmetrical surface and structure of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21G1/00D21F
CPCD21G1/00
Inventor 帕西·阿霍宁马尔库·卡尔松保利·屈特宁卡里·雷伊塞宁托米·乌尔马宁雷约·皮耶蒂凯宁埃尔基·伊尔莫涅米
Owner METSO PAPER INC
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