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Blow box for controlling the web run

A technology of blowing box and web segment, applied in the field of paper web segment, can solve the problems of lack of elasticity and large spring, and achieve the effect of improving operability

Inactive Publication Date: 2007-02-07
METSO PAPER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But springs are generally relatively stiff, they are not flexible enough to adapt quickly enough to all situations

Method used

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  • Blow box for controlling the web run
  • Blow box for controlling the web run
  • Blow box for controlling the web run

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] figure 1 shows a cross-sectional view of the drying section of a paper machine provided with a single wire, a pocket 16 formed between its two drying cylinders 10, 12 and a suction roll 14 in which a There is a blow box 18 according to the invention.

[0036] The blow box 18 is arranged between the first drying cylinder 10 and the second drying cylinder 12 in the running direction of the papermaking wire 20 supporting the paper web, in other words at the open nip 22 between the papermaking wire and the drying cylinder. The blow box at this point creates an area of ​​intensive underpressure in the space 24 between the papermaking wire 20 and the blow box 18 , so that this space is closed off from the rest of the bag zone 16 .

[0037] exist figure 1 In the solution shown in , the blow box does not cover the papermaking wire segment 20 on the rear part 26 behind the open nip between the first drying cylinder 10 and the suction roll 14, and in figure 1 In the case shown...

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Abstract

A blow box (18) for supporting the web run in a paper machine or the like, which blow box comprises members for maintaining a negative pressure at least in one negative pressure region (24) between the wire (20) and the blow box. The members comprise a blocking member (30, 32), which is arranged, regarding the wire's running direction, at the beginning and / or at the end of said negative pressure region, which extends across the wire and projects towards the wire, and which is movable in relation to the blow box, and blowing members (34,36), with which air is ejected with blows between said blocking member and the wire from said negative pressure region and / or with which air is prevented from entering this negative pressure region. The blocking member is connected to the blow box by a hinge member (40, 42), which allows the blocking member to rotate around the articulation point of the hinge member due to the pressure difference between the pressure acting on the blocking member's blocking surface (30', 32') directed towards the wire and the pressure acting on the blocking member's back surface (50, 50') directed away from the wire.

Description

technical field [0001] The invention relates to a blow box for controlling or supporting a paper web section in a paper machine, in particular in the drying section of a paper machine, or in its corresponding equipment such as a board making machine, a finishing machine and a coating machine (web run). Background technique [0002] For example in the pocket area formed between the drying cylinders in the drying section of a paper machine, especially where it is necessary to release the web from the drying cylinders in a controlled manner and run freely with the wire to the turning rolls, suction In these positions of the rolls etc., the web section needs to be controlled or supported. [0003] In order to support the web in the pockets of the drying section, it is known to use blow boxes, which are used to blow air away from the desired areas, thereby creating a negative pressure in these areas. The negative pressure generated by the blow boxes can thus be used to support ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F7/00D21F5/04D21G9/00
CPCD21G9/0063D21F5/042
Inventor J·莱穆
Owner METSO PAPER INC
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