EP3802951A1 - Walze für eine maschine zur herstellung und/oder verarbeitung einer papier-, karton- oder tissuebahn, und verfahren zum betrieb der walze - Google Patents
Walze für eine maschine zur herstellung und/oder verarbeitung einer papier-, karton- oder tissuebahn, und verfahren zum betrieb der walzeInfo
- Publication number
- EP3802951A1 EP3802951A1 EP19728963.0A EP19728963A EP3802951A1 EP 3802951 A1 EP3802951 A1 EP 3802951A1 EP 19728963 A EP19728963 A EP 19728963A EP 3802951 A1 EP3802951 A1 EP 3802951A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- lubricant
- sealing strip
- sealing
- less
- 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
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/10—Suction rolls, e.g. couch rolls
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
Definitions
- the invention relates to a roller for a machine for producing or processing a fibrous web according to the preamble of claim 1, and to a method for operating a roller according to the preamble of claim 13.
- Sealing devices in vacuumed or blown rolls for paper, cardboard or tissue machines must reliably seal the overpressure or underpressure zone from the environment in which normal pressure prevails.
- the sealing surface of each sealing strip of the sealing device is placed against the inside of the rotating roller shell.
- an attempt is made to introduce a lubricant between the sealing surface and the inside. This is usually done with spray pipes which are arranged in the direction of rotation of the roller in front of the first sealing strip of the overpressure or underpressure zone.
- the lubricant is applied to the inside of the roller shell and is conveyed by the latter to the individual sealing strips as a result of its rotation, whereby the lubricant supply decreases from the sealing strip to the sealing strip when viewed in the direction of rotation.
- a large amount of lubricant must be used, but this only benefits the small part of the actual lubrication of the sealing strips and otherwise contributes to the undesired rewetting of the fibrous web.
- EP2885457 and EP3022356 propose to direct the lubricant directly to the top side of the respective sealing strip, which provides the sealing surface, so that each individual sealing strip is targeted with the one required Amount of lubricant to supply.
- a preferred embodiment of this invention also proposes a lubricant channel provided on the top of the roller in the form of a groove-like recess arranged next to the sealing surface and extending in the longitudinal direction of the sealing strip, that is to say in the cross-machine direction of the roller, possibly with the aid of a suitable lip.
- a roller for a machine for producing or processing a fibrous web which comprises a movable roller shell and an overpressure or underpressure zone which is arranged within the roller shell and is non-rotatable compared to the roller shell, and a sealing device for sealing the overpressure or underpressure zone from the environment ,
- the sealing device has a sealing strip and a lubricating device, by means of which a lubricant can be brought between the inside of the roller shell and the sealing surface of the sealing strip, the lubricating device comprising a plurality of lubricant outlet openings and connected via a plurality of inlet segments to a supply line for supplying lubricant is.
- the roller is characterized in that the supply line comprises an inner section which runs inside the roll shell and this inner section has a storage volume of at least 490 cm 3 / m, in particular at least 500 cm 3 / m, in particular at least 750 cm 3 / m or 1000 cm 3 / m, based on the length of the sealing strip.
- An inlet segment is to be understood to mean a line part which is connected to the supply line which supplies the entire lubrication device and which conducts lubricant to part of the lubricant outlet openings.
- the size of the storage volume should be at least 490 cm 3 / m, in particular at least 100 cm 3 / m.
- the value of 490 cm 3 / m or 500 cm 3 / m is sufficient for the lubricant quantities usually used from 0.5 l / m / min to approx. 3 l / m / min.
- Larger storage volumes of 1000 cm 3 / m, 2000 cm 3 / m or more are advantageous for the purpose of equalizing the pressure as described above. Due to the installation space, which is quite narrow in some rollers, or also for economic reasons, it can make sense to limit the size of the storage volume. It can be advantageous to provide the storage volume not larger than 20,000 cm 3 / nn or 10,000 cm 3 / m.
- the indication of the storage volume in "cm 3 / m" refers to the length of the lubricated sealing strip.
- the roller can advantageously be designed as a suction roller.
- the roll shell has openings which are usually arranged in the form of a regular pattern.
- water can be sucked out of a fibrous web or a covering through the openings of the roll shell.
- the inner section comprises or consists of a tubular part which extends essentially over the entire length of the sealing strip, this tube having an inner diameter of 25 mm or more, in particular, at at least one point has more than 40mm, preferably 50mm or more.
- the tube has more than 50% of its length, in particular has a constant cross section over its entire length.
- a tube that has an inner diameter of 25 mm over the entire length provides approximately 490 cm 3 / m, that is to say approximately 500 cm 3 / m, of storage volume.
- the tube tapers continuously over its length.
- Such an embodiment can be advantageous, in particular in the case of long sealing strips with more than 5 m or more than 10 m, in order to keep the pressure at the inlet segments at the back in the direction of flow of the lubricant still constant.
- it can further be provided that the majority of the lubricant outlet openings are evenly distributed over the length of the sealing strip, in particular that the distances between adjacent lubricant outlet openings differ by less than 25% or less than 10%.
- such a distribution of the lubricant outlet openings also supports the uniform distribution of the lubricant over the entire length of the sealing strip.
- the distance between two adjacent lubricant outlet openings can advantageously be between 20 mm and 200 mm, in particular between 30 mm and 100 mm. In particularly preferred embodiments, the distance between adjacent lubricant outlet openings is between 40 mm and 60 mm.
- the lubrication device can be implemented, for example, in that the lubricant is guided by the inlet segments to nozzle devices, for example fan nozzles, which represent the lubricant outlet openings.
- the lubricant is lubricated in the direction of the sealing surface to be lubricated via the nozzles.
- These nozzle devices are known as lubricating spray pipes and are usually arranged in the direction of rotation of the roller in front of the sealing strip.
- Such sealing strips with an integrated lubrication device are often preferred because the sealing surface can be lubricated with a smaller amount of lubricant.
- the inner section is at least partially rigid.
- the term "rigid" is to be understood in comparison to the inlet segments. Inlet segments are often designed entirely or at least partially as a plastic tube. This is particularly useful for sealing strips with an integrated lubrication device, since the inlet segment has to move with the movement of the strip due to wear.
- the inner section of the supply line is at least partially made of a rigid material, e.g. is designed in the form of a metallic tube or a plastic tube.
- Sealing devices often have a so-called holder for receiving the sealing strip.
- the inner section runs at least partially on or in this holder.
- all inlet segments have the same length or differ in their length by less than 25%. If there are too large differences in the lengths of the inlet segments, there can be a risk that the effect of the equalization of the pressure achieved by the invention cannot be completely passed on to the lubricant outlet openings.
- the length of the inlet segments can advantageously be between 150 mm and 700 mm, in particular between 200 mm and 400 mm.
- the inner section of the supply line is on the outside of the suction box of a vacuum zone is mounted.
- this mounting position is more easily accessible than inside the suction box.
- the distance from the inner section of the supply line to the inlets of the sealing strip is usually smaller, so that shorter inlet segments with a length of, for example, 150 mm to 250 mm can be used.
- the distance between an inlet segment and a longitudinal end of the sealing strip can preferably be a maximum of 800 mm, in particular a maximum of 600 mm, preferably 400 mm or less.
- the inlet segments are arranged such that their distance from one another in the longitudinal direction of the roller is less than 2 m, in particular less than 1.75 m, preferably 1.5 m or less.
- the inlet segments can also be arranged in such a way that the distance between adjacent inlet segments in the longitudinal direction of the roller is the same or differs only by less than 15%, in particular less than 5%.
- the supply line also has an outer section which extends essentially outside the roller, the outer section having an inner diameter of 25 mm or less, in particular 20 mm or less or 15 mm or less, via an end face into the interior of the Roller is guided where it is connected to the inner section.
- the outer section can have a smaller inner diameter than the inner section, in particular also at the junction of the two sections.
- the object is achieved by a method for operating a roller for a machine for producing or processing a fibrous web, the roller being designed according to one of the previous claims, characterized in that the lubricating device is operated at less than 2.4 l / min / m , in particular between 0.4 l / min / m and 1.5 l / min / m of lubricant With such a quantity of lubricant, the roller proves to be particularly advantageous in accordance with one of the above-mentioned aspects.
- the lubrication device is supplied with a first quantity of lubricant over a start period, and after this start period the lubrication device is supplied with a second quantity of lubricant, the first quantity of lubricant being larger, in particular more than 25% larger than the second quantity of lubricant - each based on l / min / m.
- the lubrication device can be supplied with 2.4 l / min / m or more of lubricant over a start period, and after this start period the lubricant quantity can be supplied with less than 2.4 l / min / m, in particular between 0.4 l / min / m and 1.5 l / min / m is reduced.
- Such a start period can be, for example, at least 30 s, in particular between 30 s and 5 min.
- Such a start period which precedes standard operation, can ensure, among other things, that the storage volume is completely filled with lubricant and thus the roller or the lubrication device can develop its full effect.
- Water can usually be used as the lubricant, to which additives can optionally be added.
- the pressure in the supply line can be, for example, between 2 and 8 bar, in particular 4 bar to 6 bar.
- a sealing device for sealing an overpressure or underpressure zone of a roller for a machine for manufacturing or processing a fibrous web with the sealing device a sealing strip and has a lubricating device, by means of which, when used as intended, a lubricant can be brought between the inside of the roll shell and the sealing surface of the sealing strip, and wherein the lubricating device comprises a plurality of lubricant outlet openings and can be connected to a supply line for supplying lubricant.
- Sealing device is characterized in that the lubricating device can be connected to the supply line via a plurality of inlets, which are distributed over the length of the sealing strip, the sealing strip has a first and a second longitudinal end and the distance from at least one, preferably both longitudinal ends, to an inlet is a maximum of 800mm, in particular a maximum of 600mm, preferably 400mm or less.
- such a sealing device can be used in a roller according to one aspect of the invention, in particular in combination with a supply line which has a storage volume of at least 490 cm 3 / m, in particular at least 500 cm 3 / m.
- the inlet segments explained above can be connected to the inlets of the sealing device described here.
- such a sealing device is also advantageous when viewed on its own.
- Such a sealing device can be particularly advantageous for supplying the edges of the sealing strip with lubricant sufficiently and uniformly.
- each point can be supplied with lubricant both from the right and from the left, since there is at least one inlet on both sides through which lubricant is fed to the lubrication device.
- the problem arises that these areas are only supplied with lubricant from one side, since there is an inlet on only one side. This can lead to the region of the longitudinal ends of the sealing strip not being supplied with sufficient lubricant, especially also with less lubricant, than the central region of the sealing strip.
- Advantageous designs of such a sealing strip are described below
- the inlets are arranged in such a way that their distance from one another in the longitudinal direction of the roller is less than 2 m, in particular less than 1 75 m, preferably 1 5 m or less.
- the inlets can also be arranged such that the distance between adjacent inlets in the longitudinal direction of the roller is the same or differs only by less than 15%, in particular less than 5%.
- the lubrication device can preferably be provided entirely or partially in or on the sealing strip, in particular the lubricant outlet openings being able to be in the sealing strip.
- Figure 1 shows a section of a roller according to one aspect of the invention
- FIG. 2 shows a section of a roller according to a further aspect of the invention
- FIG. 3 shows a section of a roller according to a further aspect of the invention
- FIG. 4 shows a section of a roller according to a further aspect of the invention.
- FIG. 1 shows a roller 1 with a roller shell 11 and an end face 12.
- Such a roller can be, for example, a suction roller 1.
- a sealing device 2 is provided in the interior of the roller 1.
- This comprises a sealing strip 3, which is arranged in a sealing strip holder 3a, and one Lubrication device 4.
- the lubrication device 4 shown in FIG. 1 is largely located in the sealing strip 3.
- a large number of lubricant outlet openings 5 are arranged next to one another. These openings 5 are placed in such a way that emerging lubricant gets between the sealing surface of the sealing strip 3 and the roller jacket 11.
- a supply line 6 which comprises an inner section 7 which runs inside the roller shell 11 and a storage volume of at least 490 cm 3 / m, in particular at least 500 cm 3 / m, preferably of at least 2000 cm 3 / m, based on the length of the sealing strip, and an outer section 8.
- the lubricating device 4 is located at a plurality of inlets 10, 10a with the inner section 7 over a plurality of inlet segments 9, 9a the supply line 6 connected.
- the distances between two adjacent inlet segments 9, 9a and / or two adjacent inlets 10, 10a can each be the same.
- the inlet segments 9, 9a are arranged such that their distance from one another in the longitudinal direction of the roller 1 is less than 2 m, in particular less than 1 75 m, preferably 1 5 m or less.
- the distance between an inlet segment 9a or an inlet 10a and a longitudinal end of the sealing strip 3 can preferably be a maximum of 800 mm, in particular a maximum of 600 mm, preferably 400 mm or less.
- the length of the inlet segments can advantageously be between 150 mm and 700 mm, in particular between 200 mm and 400 mm. It is a very advantageous embodiment if the inner section 7 is mounted on the outside of the suction box of a vacuum zone.
- this mounting position is more easily accessible than inside the suction box.
- the distance from the inner section 7 of the supply line to the inlets 10, 10a of the sealing strip is usually smaller, so that shorter inlet segments 9, 9a with a length of, for example, 150 mm-250 mm can be used.
- the inner section 7 of the supply line in Figure 1 consists of a tubular part.
- This tube can advantageously be made of a material (eg metal or plastic) that is more rigid than the inlet segments 9, 9a.
- a material eg metal or plastic
- pipes with an inner diameter of 25mm corresponds to a storage volume of approx. 500 cm 3 / m
- 40mm or 50mm corresponds to a storage volume of approx. 2000 cm 3 / m
- the inlet segments 9, 9a can for example be designed as hose segments.
- Figure 2 differs from Figure 1 in that the inner portion 7 consists of a tube 7 which tapers continuously over its length.
- FIG. 3 shows a sealing strip 3 in a holder 3a, which is pressed against the inside of the roll shell 11 of the roll 1 by means of a pressure hose 13.
- a pressure hose 13 for pressing against a moving surface such as a roller jacket is a common measure known to the person skilled in the art.
- the lubrication device 4 is not integrated in the sealing strip in FIG. 3. The lubrication is carried out by means of a number of spray nozzles which make the outlet openings 5 available. The spray nozzles are connected to the inner section 7 of the supply line via inlet segments 9.
- Another advantageous feature which is implemented in FIG. 3 together with the spray nozzles, but which is also possible in combination with a lubrication device 4 integrated in the sealing strip 3, consists in the fact that the inner section 7 of the supply line is at least partially at least in or on the Sealing strip holder 3a runs.
- This inner section 7 provides the storage volume of at least 490 cm 3 / m, in particular at least 500 cm 3 / m, and can for example have the shape of a cylinder or a tapered cylinder.
- FIG. 4 essential components of the invention are shown again schematically.
- the lubricant outlet openings 5 are supplied with lubricant via inlets 10, 10a.
- the inlets 10, 10a are connected to the inner section 7 of the supply line via inlet segments 9, 9a.
- the inner section 7 is again designed as a tube, which also provides the storage volume.
- the distances from the longitudinal ends of the sealing strip 3 to the first inlet 10a or to the first inlet segment 9a are denoted by d1 or d5, while the distances from adjacent inlets 10, 10a or adjacent inlet segments 9, 9a to one another are denoted by d2, d3, d4 is designated.
- the number of 4 entrances is exemplary. More or fewer inlets / inlet segments can also be provided.
- the 'inner' distances d2-d4 can be the same or differ by a few millimeters. This can be due to the installation situation, for example.
Landscapes
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Coating Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018113831.8A DE102018113831A1 (de) | 2018-06-11 | 2018-06-11 | Walze für eine Maschine zur Herstellung und/oder Verarbeitung einer Papier-, Karton- oder Tissuebahn |
PCT/EP2019/064595 WO2019238484A1 (de) | 2018-06-11 | 2019-06-05 | Walze für eine maschine zur herstellung und/oder verarbeitung einer papier-, karton- oder tissuebahn, und verfahren zum betrieb der walze |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3802951A1 true EP3802951A1 (de) | 2021-04-14 |
Family
ID=66776340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19728963.0A Pending EP3802951A1 (de) | 2018-06-11 | 2019-06-05 | Walze für eine maschine zur herstellung und/oder verarbeitung einer papier-, karton- oder tissuebahn, und verfahren zum betrieb der walze |
Country Status (5)
Country | Link |
---|---|
US (1) | US20210254283A1 (de) |
EP (1) | EP3802951A1 (de) |
CN (1) | CN112313377B (de) |
DE (1) | DE102018113831A1 (de) |
WO (1) | WO2019238484A1 (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012213544A1 (de) * | 2012-08-01 | 2014-02-06 | Voith Patent Gmbh | Dichtleistensystem |
US9650743B2 (en) | 2012-08-15 | 2017-05-16 | Voith Patent Gmbh | Sealing device, suction roll and method for producing and/or processing a paper, cardboard or tissue web |
US9506191B2 (en) * | 2012-08-15 | 2016-11-29 | Voith Patent Gmbh | Suction roll for a machine for producing and/or processing a paper, cardboard or tissue web |
EP2885456A1 (de) * | 2012-08-15 | 2015-06-24 | Voith Patent GmbH | Dichtleiste |
EP3022356B1 (de) | 2013-07-19 | 2018-10-03 | Voith Patent GmbH | Saug- oder blaswalze mit einer dichtleiste |
-
2018
- 2018-06-11 DE DE102018113831.8A patent/DE102018113831A1/de active Pending
-
2019
- 2019-06-05 WO PCT/EP2019/064595 patent/WO2019238484A1/de unknown
- 2019-06-05 EP EP19728963.0A patent/EP3802951A1/de active Pending
- 2019-06-05 CN CN201980039456.XA patent/CN112313377B/zh active Active
- 2019-06-05 US US17/251,373 patent/US20210254283A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
DE102018113831A1 (de) | 2019-12-12 |
US20210254283A1 (en) | 2021-08-19 |
CN112313377A (zh) | 2021-02-02 |
CN112313377B (zh) | 2022-12-09 |
WO2019238484A1 (de) | 2019-12-19 |
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