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Method and arrangement in web control at a junction point of the sub-totalities of a web-forming machine

A joint position, control device technology, used in paper machine, paper machine wet end, textile and paper, etc.

Active Publication Date: 2009-05-20
METSO PAPER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So even small local pressure shocks can cause the above problems

Method used

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  • Method and arrangement in web control at a junction point of the sub-totalities of a web-forming machine
  • Method and arrangement in web control at a junction point of the sub-totalities of a web-forming machine
  • Method and arrangement in web control at a junction point of the sub-totalities of a web-forming machine

Examples

Experimental program
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Embodiment Construction

[0020] Figures 1, 2, 5 and 6 show four press sections 10, which, as well as a part of the web forming section 11 preceding the press sections 10, are well known. FIG. 5 additionally shows a horizontal impingement-drying unit 13 after the press section 10 , which is the initial part of the drying section 12 . Correspondingly, FIG. 6 shows the impingement dryer 34 following the press section 10 and the vertical impingement drying unit 13 which is the initial part of the drying section 12 . All four press sections are sub-assemblies of four large web forming machines, which may be paper or board machines. Typically, the web forming section includes at least one forming fabric that supports the web under manufacture and conveys the web forward. Correspondingly, the press section comprises at least one press fabric which likewise supports the web and conveys it onwards. The web forming machine is purposefully divided into several subassemblies which, in addition to the forming an...

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Abstract

The invention relates to a method in web control at a junction point of the sub- totalities of a web- forming machine. In the method, depending on the control requirement, either the web (18) is detached from a feeding fabric (14) and is transferred to a receiving fabric (15), so that a transfer connection is formed between the fabrics (14, 15) in question. Alterna not tively, the web (18) is broken by removing a transfer connection between the fabrics (14, 15). Irrespective of the control require not ment, the web (18) is, in addition, broken by guiding the web (18) towards a barrier (22), which is arranged after the detachment point of the web (18), in the direction of travel of the receiving fabric (15), at a distance from the receiving fabric (15). The invention also relates to an arrangement in web control at a junction point of the sub- totalities of a web-forming machine.

Description

technical field [0001] The present invention relates to a method of web control at the junction point of multiple sub-totality of a web forming machine, in which method, depending on the control requirements, [0002] or [0003] The web is detached from a feeding fabric belonging to the subassembly before the joining position and transferred to a receiving fabric belonging to the subassembly after the joining position such that a web is formed between said fabrics. transfer connection, [0004] or [0005] The web is broken by releasing the transfer connection between the fabrics. [0006] The invention also relates to a web control device at the junction point of a plurality of subassemblies of a web forming machine. Background technique [0007] US Patent 5281308 discloses one such device. Therein, a web-threading tail is first cut from a web running over a forming fabric as a feed fabric. When starting the web threading, the threading tail is transferred from the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21G9/00D21F7/00D21F2/00
CPCD21G9/0063D21F2/00D21F7/00
Inventor 图奥莫·尤瓦卡亚里·萨韦拉
Owner METSO PAPER INC
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