EP3695048A1 - Drying cylinder for a paper machine - Google Patents
Drying cylinder for a paper machineInfo
- Publication number
- EP3695048A1 EP3695048A1 EP18765822.4A EP18765822A EP3695048A1 EP 3695048 A1 EP3695048 A1 EP 3695048A1 EP 18765822 A EP18765822 A EP 18765822A EP 3695048 A1 EP3695048 A1 EP 3695048A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drying cylinder
- support rings
- cylinder
- circumferential surface
- drying
- 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.)
- Pending
Links
- 238000001035 drying Methods 0.000 title claims abstract description 85
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 abstract description 22
- 230000008093 supporting effect Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 230000008092 positive effect Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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
- D21F5/02—Drying on cylinders
Definitions
- the invention relates to a drying cylinder for a paper machine for
- Such drying cylinders are known, for example, from US Pat. No. 3,217,426, wherein the spoiler bars disclosed there are pressed against the inner surface of the drying cylinder by means of a two-part support ring.
- the support rings serve to fix the spoiler bars on the inside of the drying cylinder.
- the spoiler bars are designed to break the condensate layer so that better heat transfer of the drying cylinder can take place.
- Drying cylinders are also known from WO 2006/120060 A1, wherein the drying cylinders disclosed there are composed of individual honeycomb elements in one exemplary embodiment, including their cylinder body, and in another embodiment are provided with support rings, omitting the spoiler strips.
- the common inventive idea is the wall thickness of the
- Drying cylinder as small as possible, as a smaller wall thickness allows better heat transfer.
- this basic idea then aims to achieve improved stability of the drying cylinder.
- a fibrous web runs along a drying cylinder, touching its outer surface.
- the drying cylinder is warmed from within the cylinder and the heat is released through the drying cylinder walls to the outside, so that the fibrous web is heated and thereby dried.
- the drying cylinder should be made as thin as possible.
- the support rings and the spoiler bars are formed such that these bring the cylinder stabilizing or supporting properties improved with it.
- the distance between the support rings to each other and the distance of the spoiler bars in the circumferential direction are kept each other as possible within the limits mentioned above.
- the claimed distances of the support rings or the Störancen can produce a pattern which is formed by the support rings in combination with the Störangn, wherein a rectangular grid structure can arise and the length of the formed rectangles is a maximum of 700 mm and the second length The formed rectangles is a maximum of 250 mm.
- Training with such small spacings of the support rings and the spoiler bars in the circumferential direction can support and stabilize the drying cylinder, so that, with a suitable embodiment, possible deformations or bulges of the cylinder body can be avoided or reduced to a minimum in a very thin-walled design. Such bulges or other deformations can naturally occur faster in thin-walled cylinders than in thick-walled cylinders.
- Such deformations or bulges can occur by external forces acting on the drying cylinder jacket, such as, for example, when mechanically working the outer surface of the drying cylinder cylinder or during use of the drying cylinder during operation of a paper machine.
- the external forces can be caused by the Siebzug a drying cylinder partially wrapped around the drying wire or by pressing forces in the interaction of the drying cylinder with rollers.
- the deformations can be in these Cases lead to the circular cross-section of the drying cylinder is deformed to an oval cross-section. This leads to an alternating stress of the rotating drying cylinder jacket and as a consequence to a possible mechanical failure.
- the distance of the support rings is preferably at least 10 mm and the spacing of the spoiler bars in the circumferential direction, however, at least 5 mm in order to ensure a reliable condensate flow and a good heat transfer.
- the distance of the support rings is less than or equal to 500 mm.
- the stabilizing properties of the support rings can be further improved and the smaller distance between the support rings reduces the chance of deformations and bulges in the cylinder body.
- the spacing of the spoiler bars in the circumferential direction is less than or equal to 220 mm. Since the spoiler bars also have a stabilizing and supporting effect per se, the smaller spacing of the spoiler bars in the circumferential direction can increase the stabilizing properties of the spoiler bars on the drying cylinder and further reduces the risk of deformations in the drying cylinder.
- a fibrous web having a cylinder body, a cylinder axis, two cylinder ends and an inner circumferential surface and a cylindrical outer circumferential surface on which the fibrous web running along, wherein on the inner circumferential surface parallel to the cylinder axis Störancen positioned and disposed within the cylinder body perpendicular to the cylinder axis support rings, characterized in that the radial thickness of at least one of the support rings more than or equal to 20 mm, preferably equal to or more than 30 mm, in particular equal to or more than 50 mm and very particularly equal to or more than 100 mm, in order to be able to form it as thin-walled and thus to achieve a very good heat transfer and thus also very good drying properties.
- the support rings press directly or indirectly on the inner surface of the cylinder body and support it thereby.
- the support rings on a certain radial thickness. This should not fall below 20 mm, as these would then bring no significant supporting properties for the drying cylinder more with it.
- this thickness is greater than or equal to 50 mm.
- the entire rigidity of the drying cylinder can be increased, which is decisive for a thin-walled as possible embodiment of the cylinder body.
- Drying cylinder also breakthroughs may be provided in the support rings, without having to accept losses in stiffness.
- the breakthroughs mentioned also have the positive effect of supporting an undisturbed distribution of steam. In this way, the drying cylinder can also be heated more efficiently, whereby the dry properties of the drying cylinder can be improved again.
- the support rings should not fall below a certain radial thickness, as this would require a larger number of support rings to stabilize the shell and thus a large proportion of the inner circumferential surface is occupied by the support rings or the axial thickness of the support rings and thus less area exposed, wherein this exposed inner lateral surface per se allows the main heat transfer to the outside.
- the radial thickness of the support ring should be sufficiently high in order to produce the desired or sufficient rigidity, so that the cylinder body can be formed as thin as possible. It is understood that the support rings can also allow for heat transfer to the outside, but this, in particular because of the heat transfer to the cylinder body or because of the long path, is substantially less than the heat transfer through the inner circumferential surface. The latter also applies accordingly to the spoof bars.
- Fibrous web having a cylinder body, which has a cylinder axis, two cylinder ends and an inner circumferential surface and a cylindrical outer surface along which the fibrous web, wherein on the inner circumferential surface parallel to the cylinder axis Störancen positioned and within the cylinder body perpendicular to the cylinder axis, ie in Radial direction, support rings are arranged, characterized in that the spoiler bars have a moment of area of more than 500 mm 4 in particular of more than 600 mm 4 , in order to form these thin-walled and thus a very good heat transfer and thus also very good drying properties to achieve.
- the support function of the spoiler bars can be increased, since they can absorb more forces acting on the cylinder and sufficiently stabilize the cylinder body without the cylinder body deforming in any way.
- the support rings abut both on the inner circumferential surface, as well as on the spoiler.
- the support rings stabilize not only the cylinder body directly but also the spoiler bars, which in turn can then act again stabilizing on the cylinder body.
- the support effect of the support rings can be optimized because they press directly or indirectly against the inner circumferential surface not only with a part, but with its entire circumference.
- the support rings can also press indirectly against the inner circumferential surface by the support rings are arranged spaced from the inner circumferential surface.
- the advantage of this embodiment is that the support rings abut only on the spoiler bars and between the support ring and the inner circumferential surface is given a clearance, resulting in a better condensate flow.
- This improved condensate flow in turn has a better heat transfer of the drying cylinder and thus better drying properties result.
- the stabilizing effect of the support rings must be indirectly brought over the spoiler bars to the cylinder body.
- the support rings with the spoiler bars can also form a support structure together.
- the support rings can form a certain grid or a certain structure with the spoiler bars, which support the cylinder body on its inner circumferential surface, wherein the entire support structure can bring about improving supporting properties.
- the support rings and the spoiler strips are designed removable.
- Support rings and the spoiler bars can be designed so that you can disassemble them individually again. For example, it is conceivable that only a cylinder support ring is removed and as long as at least one support ring remains mounted, the remaining spoiler bars are still held by the entire construction. Possibly. the disassembly can also be provided in groups of modules, for example as an entire support structure. Such removable support rings and spoiler bars can be reused, for example, for more drying cylinders, for example, if the previous drying cylinder is replaced.
- this can allow the simplest possible maintenance when the drying cylinder or a fault strip or a support ring must be replaced, because not the entire drying cylinder incl support rings and straps must be replaced in case of failure, but only the affected part, such as the drying cylinder or At least one support ring or at least one stray strip is replaced and the rest can be reused.
- the inner circumferential surface is cylindrical. It is conceivable that in addition to the outer circumferential surface and the inner circumferential surface is cylindrical. Such a cylindrical inner circumferential surface can promote a uniform flow of condensate, so that the condensate can be easily removed. Furthermore, the formation of the support rings can be much easier, since cylindrical support rings can be made cheaper and easier than other types. Also, an outer cylindrical surface in combination with an inner cylindrical surface has the consequence that the wall thickness of the cylinder body is the same size at each point, so that the heat transfer along the entire cylinder body is equally good.
- the fault strips are formed segmented.
- the spoiler bars may be formed in several parts, which spaced or adjacent to each other are arranged one behind the other. On the one hand, this can simplify dismantling and possible maintenance even further.
- a segmentation of the spoiler bars, with a suitable arrangement of the spoiler segments can provide an overall higher strength in comparison to an integrally formed stray strip whose overall length also corresponds to that of the segmented stray bars.
- segmented trained spoiler bars have the advantage that the condensate ring can be better stirred up, which then improves the heat transfer through the cylinder body in a suitable embodiment.
- the support rings may preferably be segmented, which may facilitate their assembly and disassembly accordingly.
- Pressing lateral surface these may for example be connected by means acting in the circumferential direction springs which press the support rings outward against the inner surface and / or against the spoiler bars and are spread.
- this can facilitate easier disassembly or assembly of the support rings.
- this can be used to determine a very specific degree of stabilization by means of the springs. For example, a very strong support can be achieved by a spring with the largest possible spring constant. Conversely, if only a smaller supporting force is needed, a spring with a smaller spring constant can be used.
- each support ring is assigned a plurality of springs and spoiler strips distributed over the circumference.
- each of the springs has a spring constant of more than 100 N / m.
- a spring with such a spring constant has shown in practice that a sufficiently high spring constant for the support function is given. With a spring constant of not more than 300 N / m, however, it can be ensured that the pressure on the inner jacket surface is not too high.
- the radial contact force or support force of a fault strip by each spring is equal to or greater than 500N. Preferably, it is in the range of 500N to 1500N.
- the heat transfer of the drying cylinder is better, the smaller the wall thickness of the cylinder body. It has been shown that at a wall thickness of a cylinder body less than 18 mm, the desired improving heat transfer properties are given. Thus, a better drying of the paper web can be achieved.
- the lower limit of the wall thickness of the cylinder body can not be arbitrarily low, but should be at least 5 mm, otherwise no sufficient stability of the cylinder body is given and even support from the interior of the cylinder body is no longer sufficient to stabilize the cylinder body and protect it from deformation.
- a drying cylinder may include spoiler bars that extend over the entire length
- Length of a drying cylinder extend.
- Such an embodiment can be very advantageous because a condensate interruption takes place within the drying cylinder over the entire inner circumferential surface and thus this can result in a better condensate drainage and consequently a better heat transfer of the drying cylinder.
- Dry cylinder rich it may also be advantageous to provide between the spoiler bars and the cylinder ends a distance in which a siphon is arranged, through which the condensate is discharged.
- the condensate is not arbitrarily directed to the outside or flows, it may be advantageous in the range of the distance at the end of the cylinder ends to install a siphon, which can remove the condensate controlled.
- Such controlled removal of the condensate can also have a positive effect on the heat transfer of the cylinder and thus also have a positive effect on the drying properties of the drying cylinder.
- the support rings or the spoiler bars are already inserted in the cylinder body prior to machining the outer jacket surface, for example, before a removal-effective rotary operation. This achieves a stiffening of the cylinder body, because the cylinder body is already supported or stabilized before any pressure from the outside attacks the cylinder body.
- drying cylinder is suitable for arrangements in which the
- Fibrous web is a paper web. It is understood that the fibrous web may alternatively also be, for example, a board, tissue or another fibrous web for the production and / or finishing thereof. [34] It is understood that the features of the solutions written above or in the claims can possibly also be combined in order to implement the advantages in a cumulative manner.
- Figure 1 is a perspective view of a cylinder body.
- Drying cylinder 10 is shown in a sectional view, the drying cylinder 10 has a cylinder body 20 with an inner circumferential surface 23 and an outer circumferential surface 24. About a portion of the outer circumferential surface 24 of the drying cylinder 10 is in use in a drying section, not shown, to be dried paper web guided. This is in direct contact with the outer circumferential surface 24, which is heated by the interior of the cylinder body with steam.
- the cylinder end 22 is designed with a front cover with a cylindrical pin 26 for the storage of the drying cylinder.
- the front cover has at least at one end of the cylinder 22 a manhole 25 for inspection and maintenance.
- the mutually perpendicular Störancen 30 and support rings 40 are arranged, wherein the support rings 40 rest against the spoiler bars 30 via radially acting springs 41 and thus press the spoiler bars on the inner circumferential surface 23 with a contact pressure of about 1000 N.
- the distributed on the circumference of the inner circumferential surface 23 arranged spoiler bars 30 are respectively pressed by all support rings 40 via the springs 41.
- the spoiler bars extend in the axial direction, ie in the direction of the cylinder axis 21 and the support rings 40 are arranged concentrically to the cylinder axis 21.
- the support rings 40 are designed with a radial thickness 31 of 80 mm in order to ensure a sufficient supporting effect of the jacket of the cylinder body.
- the axial thickness of the support rings 40 may be in a range of 2 to 30 mm.
- the support rings 40 are made in one piece. However, they can also be segmented for ease of handling and assembly and disassembly.
- the support rings 40 are arranged at a distance from the inner lateral surface 23, so that the condensate forming from the steam in the cylinder body 20 can flow in the axial direction to a siphon, not shown, which receives the condensate and discharges it from the cylinder body 20 via a pipeline.
- the support rings 40 abut against the inner circumferential surface 23 at least partially.
- the support rings 40 have recesses to allow the passage of the condensate in the axial direction.
- a complete support ring is shown with dotted line style.
Landscapes
- Paper (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017123541.8A DE102017123541A1 (en) | 2017-10-10 | 2017-10-10 | Drying cylinder for a paper machine |
PCT/EP2018/073307 WO2019072450A1 (en) | 2017-10-10 | 2018-08-30 | Drying cylinder for a paper machine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3695048A1 true EP3695048A1 (en) | 2020-08-19 |
Family
ID=63524249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18765822.4A Pending EP3695048A1 (en) | 2017-10-10 | 2018-08-30 | Drying cylinder for a paper machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3695048A1 (en) |
CN (1) | CN111226005B (en) |
DE (1) | DE102017123541A1 (en) |
WO (1) | WO2019072450A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3217426A (en) | 1959-09-12 | 1965-11-16 | Voith Gmbh J M | Steam heated drying cylinder |
FI66220C (en) * | 1983-03-01 | 1984-09-10 | Valmet Oy | TORKCYLINDRARNA I EN PAPPER MASKIN FOER ATT FOERBAETTRA VAERMEOEVERFOERINGEN |
ZA841573B (en) * | 1983-03-08 | 1984-10-31 | Beloit Corp | Rotary drying drum |
US7028756B2 (en) * | 2002-05-17 | 2006-04-18 | The Johnson Corporation | Apparatus for increasing a transfer of thermal energy through an inner surface of a hollow cylindrical dryer of a papermaking machine |
JP3764720B2 (en) * | 2002-11-15 | 2006-04-12 | 三菱重工業株式会社 | Corrugated sheet manufacturing equipment heating roll |
CN2692190Y (en) * | 2004-04-06 | 2005-04-13 | 约翰逊(无锡)技术有限公司 | Device used for raising beat transfer capacity of heat passing through dryer internal wall of paper machine |
DE102005022237A1 (en) | 2005-05-13 | 2006-11-16 | Voith Patent Gmbh | Heated cylinder |
DE202005020589U1 (en) * | 2005-05-13 | 2006-04-20 | Voith Paper Patent Gmbh | Steam-heated hot drum for paper mill has inner frame of longerons and ribs with steam transfer holes |
DE102008054632A1 (en) * | 2008-12-15 | 2010-06-17 | Voith Patent Gmbh | Steam-heated drying cylinder for e.g. paper web, in paper machine, has holding rings cooperating with spiral springs such that radial clamping force of rings is formed, and form-fittingly connected with portion of strips by clip and pin |
DE102009001593A1 (en) * | 2009-03-17 | 2010-09-23 | Voith Patent Gmbh | Steam-heated drying cylinder with internal strips to increase the heat output |
CN204000446U (en) * | 2014-06-16 | 2014-12-10 | 彭锦铜 | A kind of drainage type flow-disturbing rod |
-
2017
- 2017-10-10 DE DE102017123541.8A patent/DE102017123541A1/en not_active Withdrawn
-
2018
- 2018-08-30 EP EP18765822.4A patent/EP3695048A1/en active Pending
- 2018-08-30 CN CN201880065773.4A patent/CN111226005B/en active Active
- 2018-08-30 WO PCT/EP2018/073307 patent/WO2019072450A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2019072450A1 (en) | 2019-04-18 |
CN111226005A (en) | 2020-06-02 |
CN111226005B (en) | 2022-02-18 |
DE102017123541A1 (en) | 2019-04-11 |
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Legal Events
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