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Structural element for a functional member of a headbox in a web-manufacturing machine, functional member and headbox made thereof, and associated methods

A technology for structural elements and manufacturing machines, applied in the wet end of paper machines, paper machines, paper making, etc., can solve problems such as interference with paper formation, and achieve the effect of reducing assembly time and weight, cost saving, and weight reduction

Inactive Publication Date: 2012-10-17
VALMET AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, a problem associated with such side-by-side plastic columns of US 4,895,624 is the stresses (eg thermal or dynamic stresses due to fluctuating slurry flow pressures in the slurry flow channels) which can deform the individual plastic columns , thus interfering with the formation of paper

Method used

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  • Structural element for a functional member of a headbox in a web-manufacturing machine, functional member and headbox made thereof, and associated methods
  • Structural element for a functional member of a headbox in a web-manufacturing machine, functional member and headbox made thereof, and associated methods
  • Structural element for a functional member of a headbox in a web-manufacturing machine, functional member and headbox made thereof, and associated methods

Examples

Experimental program
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Embodiment Construction

[0046] figure 1 A longitudinal sectional view of a structural element 17 according to a first embodiment of the present invention is shown. The structural element 17 comprises a solid monolithic block 1 having a plurality of channels 2 passing through the monolithic block 1 from the upstream end 1A to the downstream end 1B of the structural element 17 . The channels 2 define the pulp flow path and are arranged in rows and columns. For example, a monolithic block 1 may comprise four rows of channels 2, with three channels in each row, as image 3 and Figure 3B as disclosed.

[0047] The structural element 17 is designed as part of a turbulence generator unit, for example as Figure 8 as disclosed in. exist Figure 8 middle, figure 1 Three structural elements 17A, 17B and 17C of the type disclosed in are arranged side by side to form a turbulence generator unit 11 in the headbox 10 . The structural elements 17A, 17B and 17C are arranged such that the upstream end 1A and...

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Abstract

The present invention relates to a structural element (17A, 17B, 17C) for a functional member (11) in a headbox of a web-manufacturing machine, the structural element comprising an integral block (1) comprising therein a plurality of channels (2) defining flow channels for a paper stock, said stock flow channels extending through the integral block from a first upstream end (IA) to a second downstream end (IB) of the block. According to the invention, the structural element comprises at least one gap-forming element (13) which is arranged to ensure a gap (14) of a predetermined width between the block of the structural element and a neighbouring element.

Description

technical field [0001] The invention relates to a structural element for a functional part in a headbox and a headbox comprising the functional part. The invention also relates to a structural element for a headbox and a method for producing the structural element. Background technique [0002] As is known in the art, in a paper machine or other type of web making machine, stock or fiber suspensions are usually fed from a stock header or stock headers directly or through separate The pipes are supplied to the headbox, and the plurality of individual pipes guide the flow of fiber stock and are connected with the upstream end of the headbox. The slurry is then discharged as a spray from the slice chamber of the headbox through slice lip openings on the forming wire, the slice lip openings being located at the downstream end of the headbox, to form a web on the wire. [0003] A paper machine can produce a single-ply paper or board web comprising only one type of cellulosic fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F1/02
CPCD21F1/026D21F1/022D21F1/028D21F1/02
Inventor 乌尔夫·哈拉尔德松
Owner VALMET AB
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