EP3477003B1 - Verfahren zur herstellung eines yankee-trocknungszylinders - Google Patents

Verfahren zur herstellung eines yankee-trocknungszylinders Download PDF

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Publication number
EP3477003B1
EP3477003B1 EP17199425.4A EP17199425A EP3477003B1 EP 3477003 B1 EP3477003 B1 EP 3477003B1 EP 17199425 A EP17199425 A EP 17199425A EP 3477003 B1 EP3477003 B1 EP 3477003B1
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EP
European Patent Office
Prior art keywords
welding
shell
end cover
welding points
pair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17199425.4A
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English (en)
French (fr)
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EP3477003A1 (de
Inventor
Andreas HJÄRTQVIST
Stefan THYBERG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Valmet AB
Original Assignee
Valmet Oy
Valmet AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Oy, Valmet AB filed Critical Valmet Oy
Priority to EP17199425.4A priority Critical patent/EP3477003B1/de
Priority to PL17199425T priority patent/PL3477003T3/pl
Priority to CN201810957693.1A priority patent/CN109719408B/zh
Priority to BR102018072188-7A priority patent/BR102018072188B1/pt
Publication of EP3477003A1 publication Critical patent/EP3477003A1/de
Application granted granted Critical
Publication of EP3477003B1 publication Critical patent/EP3477003B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/021—Construction of the cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/181—Drying webs by hot air on Yankee cylinder

Definitions

  • the present invention relates to a method of manufacturing a Yankee drying cylinder.
  • a known way of making Yankee drying cylinders for tissue machines is to manufacture the Yankee drying cylinder from welded steel.
  • end covers (sometimes referred to as "end walls") are welded to a circular cylindrical shell such that an enclosed space is defined by the shell and the end covers. Examples of this are disclosed in, for example, EP 2126203 B1 and EP 2920360 .
  • the final product has uniform dimensions, for example uniform thickness such that it can be used to produce tissue paper with uniform properties. It is an object of the present invention to provide a method of manufacturing a Yankee drying cylinder that can produce uniform drying results.
  • the invention relates to a method of manufacturing a Yankee drying cylinder for drying wet fibrous webs by heat.
  • the inventive manufacturing method comprises the steps of providing a shell which is a circular cylindrical steel shell with two axial ends and the shell having a diameter in the range of 2 m - 8 m and forming circumferential grooves on an internal surface of the shell.
  • the method further comprises providing an end cover of steel for each axial end of the shell, each end cover having a circular circumference and welding each end cover to an axial end of the shell.
  • each end cover is welded to its respective axial end of the shell at 16 - 32 separate welding points that are made in a sequence, one after the other and separated from each other along the circumference of the end cover.
  • the welding points are made in pairs of two in which the second welding point in a pair is made directly after the first welding point of that pair and wherein the second welding point in each pair is placed at an angular distance along the circumference of the end cover which lies in the range of 175° - 185° from the first welding point of that pair.
  • the indicated range of 175° - 185° can alternatively be expressed as 180° +/- 5°.
  • not just the first 8 welding points but all welding points are made in pairs of two that are made in such a sequence that the second welding point of each pair is made directly after the first welding point of that pair and such that the second welding point of each pair is separated from the first welding point of that pair by an angular distance of 175° - 185° along the circumference of the end cover (i.e. 180° +/- 5°).
  • the third and the fourth welding points are located at an angular distance from the first welding point in the entire sequence which is in the range of 85° - 95°.
  • the gaps between the separate welding points may be closed by additional welding after the separate welding points have been made. In preferred embodiments of the inventive method, this is done in two steps. First, welding is performed between the separate welding points. Thereafter, a continuous weld bead can be made that covers both the separate welding points and the welds between them.
  • SAW submerged arc welding
  • grinding is performed on the separate welding points before further welding is made.
  • all welding points are evenly spaced around the circumference of the end cover in a symmetrical pattern such that the angular distance between adjacent welding points is the same for all welding points and every welding point belongs to a pair of welding points located at an angular distance of 180° from each other.
  • the manufacturing method is carried out such that, before the end cover is welded to the circular cylindrical shell, the circular cylindrical shell is lifted onto the end cover such that the welding points are made when the circular cylindrical shell is standing on the end cover which is being welded to it.
  • both end covers are welded to their respective axial end of the circular cylindrical shell before the gaps between the separate welding points are closed by further welding.
  • a Yankee drying cylinder 1 receives a fibrous web W which may in particular be a tissue web W intended for such end products as bathroom, kitchen, paper towel, facial tissue and the like and for which the basis weight of the end product may be in the range of - for example - 12 g/m 2 - 30 g/m 2 .
  • the still wet fibrous web W is brought on a fabric 22 to a nip formed between a roll 23 and the Yankee drying cylinder 1.
  • the fabric 2 may be, for example, a water-absorbing felt or an open wire.
  • the fibrous web W is transferred to the outer surface of the Yankee drying cylinder 1 that is rotating in the direction of arrow R.
  • the Yankee drying cylinder is heated, normally by hot steam that is supplied to the interior of the Yankee drying cylinder 1. Due to the high temperature of the Yankee drying cylinder 1, water in the fibrous web W is evaporated such that the web W reaches a high dryness.
  • the web W can then be creped from the outer surface of the Yankee drying cylinder 1 by a doctor blade 21. In Figure 1 , only one doctor blade 21 is shown but it should be understood that two or even more doctor blades may be placed after each other in the circumferential direction of the Yankee drying cylinder 1.
  • the Yankee drying cylinder manufactured according to the present invention may be used in a context such as the one schematically indicated in Figure 1 .
  • the roll 23 in Figure 1 may be, for example, a suction roll, a shoe roll, a deflection compensated roll or a solid roll.
  • the fabric 22 may also be a water impervious belt with a coating of, for example, polyurethane and such a belt may have a surface facing the web W which is smooth (even) or provided with a pattern for imparting a three-dimensional structure to the web W.
  • a Yankee hood (not shown) may optionally be placed over the Yankeed drying cylinder for blowing hot air against the fibrous web W.
  • a shell 2 is provided which is a circular cylindrical steel shell and which will form the shell of the ready-made Yankee drying cylinder.
  • the shell 2 has a diameter in the range of 2 m - 8 m or in the range of 3 m - 7 m.
  • the shell 2 may have a diameter of 4 m or 5.5 m.
  • the shell 2 extends in an axial direction and it has a first axial end 3 and a second axial end 4.
  • the shell 2 has an interior surface 5 which is provided with circumferential grooves 6 in which condensate water may be collected to be subsequently evacuated.
  • the circumferential grooves 6 are made at some point in the manufacturing process and normally before end covers have been welded to the shell 2.
  • the circumferential grooves 6 may be formed by a cutting operation in which material is removed by a cutting tool that may be mounted on a machine (not shown). It should be understood that embodiments are conceivable in which the circumferential grooves 6 are formed only after one or both of the end covers 7, 8 have been welded to the shell 2 and all welding is completed. Such embodiments may be less preferred but are nevertheless conceivable.
  • the manufacturing process further comprises providing an end cover 7, 8 for each axial end and each end cover 7, 8 is made of steel.
  • Each end cover 7, 8 has a circular circumference-
  • Each end cover is welded to an axial end 3, 4 of the shell.
  • the end cover 7 in Figure 2 and Figure 3 may be welded to the axial end 3 of the shell 2 while the end cover 8 is welded to the axial end 4 of the shell 2 such that the shell 2 and the end covers 7, 8 define an enclosed space and the present invention relates to a method in which the end covers 7, 8 are welded to the axial ends 3, 4 of the shell 2.
  • Each end cover 7, 8 is a coherent detail before it is welded to the steel shell 2. It may be made of, for example, a piece of rolled steel that has been machined to a circular cylindrical plate.
  • FIG. 4 it can be seen how the part of the end wall 7 that is to be welded to the shell 2 is provided with a slanting or beveled surface 9 that may be shaped in two sections and the axial end 3 of the shell 2 is given a similar slanted or beveled surface 10.
  • a weld 12a has been applied.
  • weld 12a is not to be understood as representing a continuous weld bead that extends around the entire circumference of the end cover 7 (and the axial end 3 of the shell 2).
  • the present invention provides a solution to this problem.
  • the welding point 12a represents the first weld that is made, and this is made at a single point.
  • the second welding point 12b is made at a position that is at an angular distance (in the circumferential direction of the end cover 7) that lies in the range of 175°- 185°from the first welding point 12a (preferably 180°).
  • any heat deformation caused by the welding points will be more symmetrically distributed which in turn makes it possible to achieve more uniform thickness of the shell 2 when an external machining operation is performed on the shell 2. Since the sections that are welded are short in relation to the circumference of the end cover 7, 8, the movements/deformations will be smaller than if a continuous weld bead had been made directly and this also contributes to a good result.
  • the length of a welding point 12a, 12b, 12c, 12d, 12e, 12f «12x should suitably be in the range of 100 mm - 250 mm and preferably in the range of 150 mm - 200 mm.
  • the indicated length of the welding points 12a, 12b, 12c, 12d...12x is viewed by the inventors as suitable at least when the diameter of the shell 2 is in the range of 2 m - 8m.
  • the third welding point 12c is made at an angular distance (along the circumference of the end cover 7) from the first welding point 12a that lies in the range of 85° - 95° (clockwise or counter-clockwise) and the fourth welding point 12d is made at an angular distance from the third welding point 12c which is in the range of 175°- 185° and which is preferably 180°.
  • the fifth and sixth welding points 12e, 12f are likewise placed at an angular distance from each other which is in the range of 175°- 185° (i.e. 180°+/- 5°) and the same is also the case for the seventh and eighth welding points 12g, 12 h.
  • At least the first 8 welding points 12a - 12h are made in pairs where every second welding point in each pair is located 175° - 185° from the first welding point of that pair and in which the second welding point of each par is made immediately after the first welding point of that pair.
  • 16 welding points 12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i, 12j, 12k, 121, 12m, 12n, 12o and 12p are used. It should be understood that more than 16 welding points may be used. If the diameter of the Yankee drying cylinder is greater than 4 m, 16 welding points are believed to be insufficient and 32 welding points would be preferable.
  • the angular distance ⁇ between different welding points is the same for all welding points. It is also preferable that the angular distance between two welding points in a pair is 180° or as close to 180° as possible in order to achieve a more symmetrical distribution of thermal deformations.
  • the third and the fourth welding points 12c, 12d are located at an angular distance from the first welding point 12a in the entire sequence which is in the range of 85° - 95°., preferably at an angular distance of 90°. All welding points 12a, 12b, 12c, 12d Vietnamesex would then be evenly spaced around the circumference of the end cover 7, 8 in a symmetrical pattern such that the angular distance between adjacent welding points 12a, 12b, 12c, 12d Vietnamese12n is the same for all welding points 12a, 12b, 12c, 12d Vietnamese12x and which every welding point 12a, 12b, 12c, 12d doi12x belongs to a pair of welding points located at an angular distance of 180° from each other.
  • each and every welding point can have an opposing welding point at an angular distance of 180° or about 180°.
  • At least the first 8 welding points that are made should be made in pairs where each welding point in a pair is placed at an angular distance of 175° - 185° (preferably 180°) from the other welding point of that pair.
  • a welding machine 17 for example a welding robot
  • a continuous welding bead 14 that covers both the separate welding points and the welds between separate the welding points 12a, 12b, 12c, 12d Vietnamesex. This can be done as the Yankee drying cylinder 1 is kept on a roller bed (not shown) and rotated as indicated by the arrow A.
  • the continuous welding bead 14 can be performed using submerged arc welding (SAW) but other solutions may also be contemplated.
  • the reference numeral 19 represents a manhole allowing internal inspection of the Yankee drying cylinder.
  • the reference numeral 20 represents an opening for a journal through which steam cab be supplied to the interior of the Yankee drying cylinder 1.
  • FIG 10 is a schematic representation of how the welds may be located in relation to each other. Separate welding points 12 that have been made first have gaps between them that are closed by intermediate welds 24. A continuous weld bead 14 is applied on top of the separate welding points 12 and the intermediate welds 24.
  • Grinding is preferably performed on the separate welding points before the gaps between them are closed by further welding. This removes small defects and makes it easier for the separate welding points to coalesce with the welds applied between the separate welding points.
  • grinding may possibly be performed only after the continuous welding bead 14 has been applied. Grinding may also be performed after each welding step.
  • the welding between separate welding points as well as the continuous weld bead 14 may possibly be applied to one end cover 7 before the second end cover 8 has been welded by separate welding points but it is preferable that both end covers 7, 8 are welded to their respective axial end 3, 4 of the circular cylindrical shell 2 by separate welding points before further welding is performed.
  • welds (including both the separate welding points, the welds 24 between them and the continuous weld bead 14) are preferably subjected to heat treatment.
  • a Yankee drying cylinder can be manufactured in which thickness variations in the shell can be reduced and the drying of the fibrous web will become more even.

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  • Paper (AREA)
  • Arc Welding In General (AREA)

Claims (12)

  1. Verfahren zum Herstellen eines Yankee-Trocknungszylinders (1) zum Trocknen nasser faserförmiger Bahnen (W) durch Wärme, wobei das Herstellverfahren umfasst die Schritte von: Bereitstellen eines Gehäuses (2), das ein kreisförmiges zylindrisches Stahlgehäuse (2) mit zwei axialen Enden (3, 4) ist, und wobei das Gehäuse (2) einen Durchmesser in dem Bereich von 2 m - 8 m aufweist; Bilden von umlaufenden Nuten (6) auf einer innenliegenden Fläche (5) des Gehäuses; Bereitstellen einer Endabdeckung (7, 8) aus Stahl für jedes axiale Ende (3, 4) des Gehäuses (2), wobei jede Endabdeckung (7, 8) einen kreisförmigen Umfang aufweist, und Schweißen jeder Endabdeckung (7, 8) an ein axiales Ende (3, 4) von dem Gehäuse (2),
    gekennzeichnet dadurch, dass jede Endabdeckung (7, 8) an ihr jeweiliges axiales Ende (3, 4) des Gehäuses (2) an 16 - 32 separaten Schweißpunkten (12a, 12b, 12c, 12d ..... 12x) geschweißt wird, die in einer Sequenz, einer nach dem anderen, und separiert voneinander entlang des Umfangs der Endabdeckung (7, 8) hergestellt werden, und gekennzeichnet dadurch, dass, für wenigstens die ersten 8 Schweißpunkte (12a, 12b, 12c, 12d ..... 12x), die Schweißpunkte (12a, 12b, 12c, 12d ..... 12x) in Paaren hergestellt werden, in denen der zweite Schweißpunkt (12a, 12b, 12c, 12d ..... 12x) in einem Paar direkt nach dem ersten Schweißpunkt (12a, 12b, 12c, 12d ..... 12x) von diesem Paar hergestellt wird und wobei der zweite Schweißpunkt (12a, 12b, 12c, 12d ..... 12x) in jedem Paar in einem Winkelabstand entlang des Umfangs der Endabdeckung (7, 8) platziert wird, der in dem Bereich von 175 ° - 185 ° von dem ersten Schweißpunkt dieses Paares liegt.
  2. Verfahren nach Anspruch 1, wobei alle Schweißpunkte (12a, 12b, 12c, 12d ... 12x) in Paaren hergestellt werden, die in solch einer Sequenz hergestellt werden, dass der zweite Schweißpunkt jedes Paares direkt nach dem ersten Schweißpunkt dieses Paares hergestellt wird und wobei der zweite Schweißpunkt jedes Paares von dem ersten Schweißpunkt dieses Paares durch einen Winkelabstand von 175 ° - 185 ° entlang des Umfangs der Endabdeckung (7, 8) separiert wird.
  3. Verfahren nach Anspruch 1, wobei sich der dritte und der vierte Schweißpunkt (12c, 12d) in einem Winkelabstand von dem ersten Schweißpunkt (12a) in der gesamten Sequenz befinden, der in dem Bereich von 85 ° - 95 ° liegt.
  4. Verfahren nach Anspruch 1, wobei, nachdem alle Schweißpunkte (12a, 12b, 12c, 12d ... 12x) hergestellt wurden, die Abstände zwischen den Schweißpunkten (12a, 12b, 12c, 12d, ..... 12x) durch weiteres Schweißen geschlossen werden.
  5. Verfahren nach Anspruch 4, wobei, nachdem die Abstände zwischen den Schweißpunkten (12a, 12b, 12c, 12d, ..... 12x) durch weiteres Schweißen geschlossen wurden, eine kontinuierliche Schweißnaht (14) hergestellt wird, die sowohl die separaten Schweißpunkte (12a, 12b, 12c, 12d ..... 12x) als auch Schweißungen, die zwischen den separaten Schweißpunkten (12a, 12b, 12c, 12d, ..... 12x) hergestellt wurden, abdeckt.
  6. Verfahren nach Anspruch 4, wobei Schleifen an allen separaten Schweißpunkten (12a, 12b, 12c, 12d ... 12x) durchgeführt wird, bevor weiteres Schweißen durchgeführt wird.
  7. Verfahren nach Anspruch 5, bei dem Unterpulverschweißen verwendet wird, um die kontinuierliche Schweißnaht (14) herzustellen.
  8. Verfahren nach Anspruch 1, wobei alle Schweißpunkte (12a, 12b, 12c, 12d ... 12x) gleichmäßig beabstandet sind um den Umfang der Endabdeckung (7, 8) in einem symmetrischen Muster, so dass der Winkelabstand zwischen benachbarten Schweißpunkten (12a, 12b, 12c, 12d ..... 12x) der gleiche für alle Schweißpunkte (12a, 12b, 12c, 12d ..... 12x) ist und in dem jeder Schweißpunkt (12a, 12b, 12c, 12d ..... 12x) zu einem Paar von Schweißpunkten gehört, die sich in einem Winkelabstand von 180 ° voneinander befinden.
  9. Verfahren nach Anspruch 1, bevor die Endabdeckung (7, 8) an das kreisförmige zylindrische Gehäuse (2) geschweißt wird, wobei das kreisförmige zylindrische Gehäuse (2) auf die Endabdeckung (7, 8) gehoben wird, so dass die Schweißpunkte (12a, 12b, 12c, 12d ..... 12x) hergestellt werden, wenn das kreisförmige zylindrische Gehäuse (2) auf der Endabdeckung (7, 8) steht, an das sie geschweißt wird.
  10. Verfahren nach Anspruch 8, wobei beide Endabdeckungen (7, 8) an ihr jeweiliges axiales Ende (3, 4) des kreisförmigen zylindrischen Gehäuses (2) geschweißt werden, wonach die Abstände zwischen separaten Schweißpunkten durch weiteres Schweißen geschlossen werden.
  11. Verfahren nach Anspruch 1, wobei die umlaufenden Nuten (6) auf der innenliegenden Fläche (5) des Gehäuses (2) gebildet werden, bevor eine der Endabdeckungen (7, 8) mit dem Gehäuse (2) verschweißt wird.
  12. Verfahren nach einem der vorhergehenden Ansprüche, wobei, in der Umfangsrichtung einer Endabdeckung (7, 8), jeder separate Schweißpunkt (12a, 12b, 12c, 12d ... 12x) eine Länge in dem Bereich von 100 mm - 250 mm und vorzugsweise eine Länge in dem Bereich von 150 mm - 200 mm aufweist.
EP17199425.4A 2017-10-31 2017-10-31 Verfahren zur herstellung eines yankee-trocknungszylinders Active EP3477003B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17199425.4A EP3477003B1 (de) 2017-10-31 2017-10-31 Verfahren zur herstellung eines yankee-trocknungszylinders
PL17199425T PL3477003T3 (pl) 2017-10-31 2017-10-31 Sposób wytwarzania cylindra suszącego typu Yankee
CN201810957693.1A CN109719408B (zh) 2017-10-31 2018-08-22 制造杨克烘缸的方法
BR102018072188-7A BR102018072188B1 (pt) 2017-10-31 2018-10-26 Método para fabricar um cilindro de secagem yankee

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17199425.4A EP3477003B1 (de) 2017-10-31 2017-10-31 Verfahren zur herstellung eines yankee-trocknungszylinders

Publications (2)

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EP3477003A1 EP3477003A1 (de) 2019-05-01
EP3477003B1 true EP3477003B1 (de) 2020-04-01

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EP17199425.4A Active EP3477003B1 (de) 2017-10-31 2017-10-31 Verfahren zur herstellung eines yankee-trocknungszylinders

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EP (1) EP3477003B1 (de)
CN (1) CN109719408B (de)
BR (1) BR102018072188B1 (de)
PL (1) PL3477003T3 (de)

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CN113427219B (zh) * 2021-07-19 2023-07-14 溧阳市江南烘缸制造有限公司 一种大型钢制扬克烘缸的制造方法

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BRPI0721415B1 (pt) * 2007-03-01 2020-11-10 Toscotec S.P.A. cilindro yankee feito de aço, que inclui uma carcaça cilíndrica unida a duas extremidades
AT511232B1 (de) * 2011-03-21 2014-09-15 Andritz Ag Maschf Verfahren zur herstellung eines yankeezylinders
SE1251287A1 (sv) 2012-11-13 2014-05-06 Valmet Aktiebolag Yankeecylinder gjord av stål
WO2015014515A1 (de) * 2013-08-01 2015-02-05 Voith Patent Gmbh GROßZYLINDER-TROCKENWALZE SOWIE VERFAHREN ZUM HERSTELLEN EINER GROßZYLINDER-TROCKENWALZE
SE538066C2 (sv) * 2013-11-19 2016-02-23 Valmet Aktiebolag En metod för tillverkning av en yankee-cylinder av stål
CN104611977B (zh) * 2015-02-10 2017-04-05 轻工业杭州机电设计研究院 钎焊带肋筋结构的造纸机烘缸及其制作方法

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BR102018072188A2 (pt) 2019-11-26
PL3477003T3 (pl) 2020-08-24
CN109719408A (zh) 2019-05-07
BR102018072188B1 (pt) 2023-02-07
CN109719408B (zh) 2021-06-18
EP3477003A1 (de) 2019-05-01

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