CN113994046A - Machine for producing a fibrous web - Google Patents
Machine for producing a fibrous web Download PDFInfo
- Publication number
- CN113994046A CN113994046A CN202080043991.5A CN202080043991A CN113994046A CN 113994046 A CN113994046 A CN 113994046A CN 202080043991 A CN202080043991 A CN 202080043991A CN 113994046 A CN113994046 A CN 113994046A
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- shoe press
- preparation
- roll
- felted
- felt
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- 238000009499 grossing Methods 0.000 claims abstract description 26
- 238000004806 packaging method and process Methods 0.000 claims abstract description 9
- 239000011111 cardboard Substances 0.000 claims abstract description 8
- 239000011087 paperboard Substances 0.000 claims abstract description 8
- 230000013011 mating Effects 0.000 claims description 33
- 238000001035 drying Methods 0.000 claims description 29
- 238000004140 cleaning Methods 0.000 claims description 14
- 238000009950 felting Methods 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 9
- 239000000123 paper Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 229920001875 Ebonite Polymers 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 35
- 229920006395 saturated elastomer Polymers 0.000 claims 1
- 230000032258 transport Effects 0.000 description 7
- 238000003892 spreading Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000002609 medium Substances 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000006163 transport media Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
-
- 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
-
- 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
- D21F3/08—Pressure 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
Abstract
The invention relates to a machine for producing a fibrous web, in particular a packaging paper or cardboard web, comprising at least one, preferably two double-felted shoe presses arranged one behind the other in the web running direction and at least one single-felted shoe press, in particular designed as a smoothing press, arranged in the web running direction after the two double-felted shoe presses.
Description
The invention relates to a machine for producing a fibrous web, in particular a packaging paper or cardboard web, having at least one, preferably two, double felted shoe presses arranged one behind the other in the direction of web travel.
For having inThe gram weight is up to 8g/m2To 500g/m2The packaging paper and board (packaging and board) of (1), usually a fourfold felted, so-called inline nipco flex press (TNFP), which is a press with two shoe presses arranged one after the other, each double felted. At machine or web speed<At 1200m/min, a separation suction is usually used for web separation, whereas at machine speeds or web running speeds above 1200m/min, a suction felt guide roll is usually used for web separation.
Fig. 1 shows a fourfold felted TNFP press 10, the two shoe presses 12 of which are each equipped with a suction felt guide roll 14 for web separation. In contrast, fig. 2 shows a fourfold felted TNFP press 10, the shoe presses 12 of which each have a separating suction 16 for web separation.
For some types of packages, especially those having a white cover layer with fresh fibre content or almost all types of board, a smoothing press is used after the T NFP press, by which the passing end of the paper web is made particularly smooth. For this purpose, no felt can be used, since this must be done with a smooth surface. Depending on the speed requirements, there have hitherto been two common alternatives to smoothing presses, namely offset presses (offsetpresses) or spreading presses (legefresses).
In the offset press, the fibrous web is pulled in a long, open draw from the TNFP press into the nip or press nip of the offset press, which is configured between a smooth top roll and a smooth bottom roll. After the nip, the fibrous web is guided for transfer in a long open draw to a subsequent dryer group.
Fig. 3 shows a schematic diagram of a quadruple felted TNFP press 10, after which an offset press 18 is arranged. The two shoe presses 12 of the TNFP press 10, which are each double felted, are in this case in turn equipped with a separating suction 16 for web separation.
The advantages of the offset press include that it is the cheapest smoothing press and by means of which the top and bottom sides of the fibrous web are flattened with smooth rolls. However, in most cases it is sufficient to level only one web side. It is also advantageous, in particular, that only one pulper 20 is required to accommodate the accumulated waste (see fig. 3).
However, offset presses also have a series of disadvantages. There are a total of two open draws between the TNFP press and the offset press and after the offset press. The fibrous web must be pulled from the smooth roll twice with a high speed differential that produces the release force. The maximum web travel speed is therefore limited by the strength of the web and the quality of the material, which relates to the inclusion of foreign bodies, which act like predetermined breaking points for the break. This is a very important problem since the quality of the material in terms of its strength and purity (foreign matter) is constantly decreasing over the years. Since no transport medium, such as felt, is used, the fibrous web must overcome a very long open draw before and after the offset press. The web is highly stretched due to air currents and gravity, which results in a large pulling force having to be applied to compensate for this. The large pulling forces result in local shedding of fibers in the web of the fibrous web. In particular, the cleavage strength and all relevant quality parameters drop sharply. The fibrous web also becomes porous. Therefore, offset presses can mostly only be used for web running speeds up to 1000 m/min.
A further disadvantage of offset presses relates to the transfer of the fibrous web. The fibrous web can only be guided to the second bottom felt of the TNFP press over the web width. The strand must then be cut and first guided through the open nip of the offset press to the drying section. For this purpose, a rope cutter must be used before the nip. Furthermore, the fibrous web must be deflected into a string cutter, which must be carried out manually and involves a very high risk of accidents. The fiber web can be widened only after the transfer of the slivers and the closing of the offset press. Transferring the strip in two open draws is very time-consuming, since the process is on the one hand long in duration and on the other hand must be repeated often, since the sensitive strip is easily broken.
Since the offset press has neither felt nor press rolls, dewatering of the fibrous web and thus also an increase in the dry weight content cannot be carried out.
Although in offset rolls, leveling is achieved by smooth contact fittings, such as ceramic or hard rubber rolls. The dwell time of the fibrous web in the nip is limited. A roll nip is used which has a contact length of only a few centimeters (between 20 and 50 mm). Especially for heavier packages and board grades coming from previous presses with a very high roughness, such a small contact length is not sufficient to achieve levelling. To compensate for this, high line loads for hard nips without soft rolls and without compressible clothing are usually applied in order to compensate for the missing dwell time in the smoothing by means of a high peak pressure. However, this now has adverse consequences, in particular in the case of cardboard grades, since this depends to a large extent on the specific volume. Paperboard manufacture is only economical when it consumes as little fiber as possible in manufacture for the desired thickness.
In a lay-up or through press (Straight-through), the fibrous web is laid from the TNFP press onto the mat after an open draw. Fig. 4 shows a schematic of a quadruple felted TNFP press 10, such a felting press 22 being connected to the TNFP press 10. Here, the two shoe presses 12 of the TNFP press 10 are again provided in this case, for example, with a separating suction 16 for web separation. In this case, the fibrous web is laid from the second shoe press 12 of the TNFP press 10 onto the mat 24 of the laying press 22 after the open draw. In order not to form an interfering air layer between the fibrous web and the felt, which would lead to web running problems, suction felt guide rollers 26 are mostly used. The felt 24 transports the fibrous web into a nip 28 of the paving press 22, which is formed between a smooth top roll 30 and a press roll 32 on the felt side. After the nip 28, the fibrous web follows a smooth top roll 30. In order to transfer the fibrous web into the subsequent dryer group 34 of the drying section, the fibrous web must be pulled off with an open draw.
The advantages of the spreading press include that the fibrous web is supported by the felt and thus long open draws do not have to be overcome. Hereby, the solution comprising such a spreading press is used for web running speeds > 1000 m/min. A further advantage is that in such a spreading press, as opposed to an offset press, a press roll is used on the felt side. Such press rolls are provided with a storage capacity and may additionally contribute to dewatering.
However, due to the kind of construction of the paving press, the roll nip has a line load of 40 to 140kN/m, so that mostly no or only little dewatering is achieved and therefore no or only a negligible increase in the dry weight content is achieved. Typically, moisture regain and a drop in dry weight content after the paving press occur in view of the desired mat conditioning.
A disadvantage of the paving press also includes that a total of two open pulls occur after the TNFP press and the paving press. This open draw in the paving press is however significantly shorter than in the offset press. A further disadvantage of the spreading press relates to the transfer of the fibrous web. Thus, the fibrous web can be guided over the web width only to the second bottom felt of the TNFP press. After which the strip must be cut and first guided to the top roll of the paving press and then transferred from the top roll of the paving press to the drying section in a second step. The disadvantages of this transfer in two steps are already mentioned above.
The paving press, though, has a mat guide with associated mat conditioning. But its contribution to dewatering is insignificant. It must therefore be operated with relatively high effort, and the advantages are limited to a flattening only on one side. Since the paving press has felt in a mechanical stack (im Keller), two pulpers 20 (see fig. 4) are required to accommodate the waste material accumulated after the second press and after the third press. With felts in the mechanical stack, two locations cannot be associated with one pulper, which entails a high financial extra cost.
The object of the invention is to provide a machine of the type mentioned at the outset which is particularly suitable for producing medium to heavy packaging paper and board types at machine speeds or web running speeds > 1000m/min, in which machine the above-mentioned problems are solved. In particular, a very high smoothing effect should be achieved here. At the same time, the specific volume of the fibrous web in the cardboard type should be protected, or in the case of correspondingly different shoe designs or different pressure profiles in the shoe press, an increase in the degree of compaction or an increase in the relevant properties such as SCT or TSI in the cross direction should also be achieved at the same time as smoothing. In the transfer of the fibrous web from the previous press section and to the subsequent dryer section, in each case a slight draw should occur in order to protect the fibrous web as much as possible and to ensure the layer strength and all further quality characteristics associated therewith, such as SCT in the cross direction. The web transfer becomes significantly simpler and safer and in particular takes place faster to minimize possible production losses. Finally, one pulper should suffice.
The above-mentioned object is achieved according to the invention by a machine having the features of claim 1. An advantageous application of the machine according to the invention is given in claim 37. Preferred embodiments of the machine according to the invention emerge from the dependent claims, the description and the drawings.
The machine according to the invention for producing a fibrous web, in particular a packaging paper or cardboard web, comprises at least one, preferably two double felted shoe presses arranged one after the other in the web running direction and at least one single felted shoe press, in particular designed as a smoothing press, arranged in the web running direction after the two double felted shoe presses.
Due to this design, particularly for medium to heavy packaging paper and board grades, a very high smoothing effect can be achieved at machine speeds or web running speeds > 1000m/min, while at the same time the specific volume of the fibrous web in the board grade is preserved, or an increase in the degree of compaction is achieved with correspondingly different shoe designs or different pressure profiles in the shoe press, whereby also the properties associated therewith, such as SCT or TSI in the cross direction, can be ensured. Only a slight traction takes place during the transfer of the fibrous web from the previous press section and to the subsequent drying section, whereby the fibrous web is correspondingly protected. This ensures the layer strength and all other quality properties associated therewith, such as SCT in the transverse direction. The transfer of the fibrous web is significantly simplified and safer, wherein in particular it can be carried out faster, thereby minimizing production losses. Furthermore, only one single pulper is required, which saves costs. For ever greater production rates, protected or gentle dewatering can be achieved without erosion of the fibrous web due to too strong dewatering. According to the invention, the total dewatering is distributed over a larger number of dewatering nips, including the single-felted shoe press zone of a single-felted shoe press acting as a smoothing roll. A milder dewatering is obtained by the shoe press zone.
The machine according to the invention is used in particular for producing grammage or mass per unit area of 80g/m at web running speeds > 1000m/min2To 500g/m2Medium to heavy paper and/or paperboard.
Preferably, a linear force of ≥ 400kN/m, in particular ≥ 500kN/m, preferably ≥ 700kN/m, can be generated in the respective shoe press zone of the shoe press. In order to ensure a sufficient dewatering time, the corresponding press shoe of the shoe press advantageously has a length of more than or equal to 250 mm.
It is particularly advantageous if the at least one shoe press, in particular a single-felted shoe press designed as a smoothing press, comprises a shoe press roll, in particular the upper one, and a mating roll, in particular the lower one, which is smooth, in particular provided with a ceramic surface or a hard rubber surface. The shoe press roll and the mating roll can be arranged vertically one above the other. In this case, the associated shoe press zone is arranged substantially straight or parallel to a horizontal plane, wherein the unsupported fibrous web can be conveyed upwards approximately vertically without falling off.
According to a further advantageous embodiment, the at least one shoe press of single felting designed as a smoothing press comprises an especially upper shoe press roll and an especially lower mating roll, which is wrapped by a conveyor belt. The fibrous web can be conveyed to the drying section by means of such a conveyor belt in a closed web run. The shoe press roll and the counter roll wound by the conveyor belt can be arranged, for example, at least substantially vertically one above the other, so that a shoe press zone is formed which is arranged straight or at least substantially parallel to the horizontal. The fibrous web can in this case be conveyed at least substantially vertically upwards without falling off. However, designs are also conceivable in which the shoe press roll and the counter roll, around which the belt is wound, are offset or arranged obliquely with respect to the vertical, so that an oblique arrangement of the single felted shoe press is formed, into which the fibrous web can run supported by the belt, and in which a particularly high collection capacity of the vat after the shoe press zone is achieved.
As mentioned above, the fibrous web can be transferred in a closed web run into the drying section by means of a belt wrapped around the mating roll of a single felted shoe press.
It is advantageous, in particular, to guide the respective conveyor belt loop without externally located guide rollers.
The peak pressure in the shoe press zone of the last single felted shoe press is preferably equal to or greater than the peak pressure in the shoe press zone of the previous shoe press. In order to convey the fibrous web through all shoe press zones and the subsequent dryer groups into the dryer section as crease-free as possible, a web travel speed difference of 0.2% to 3.5% is expediently provided between the successive shoe presses.
Different locations of the machine where waste occurs can be provided with a common pulper, with corresponding cost savings. In this case, when the fibrous web breaks in the dryer section, the accumulated waste material is conducted through a first dryer cylinder, as viewed in the web running direction, to a common pulper. There is no need to retransfer the fibrous web through the press section. Preferably, the first drying cylinder of the drying section, viewed in the web running direction, is provided with at least one, preferably two, doctor blades for removing the fibrous web and for cleaning the drying cylinder.
In order to avoid automatic transfer and stable removal of the fibrous web, the horizontal distance between the center of the first drying cylinder or roller and the subsequent first stabilizing roller of the drying section, viewed in the web running direction, is preferably greater than or equal to 80%, in particular greater than or equal to 90%, preferably greater than or equal to 95%, of the sum of half the diameters of the two rollers.
In order to achieve the highest possible cleaning effect, a high-performance cleaning device with at least one, preferably at least two rows of nozzles for generating at least two individual jets, respectively, which impinge obliquely from different directions onto the conveyor belt surface, is advantageously arranged on the conveyor belt around the mating roll of the respective single-felted shoe press. In particular, very thin nozzle rows can be used here. The pressure of the nozzle of the high-performance cleaning apparatus is preferably > 50bar, in particular > 100bar, preferably > 120 bar. The diameter of the nozzles of the high-performance cleaning apparatus is preferably less than or equal to 0.7mm, in particular less than or equal to 0.5mm, preferably less than or equal to 0.3 mm.
After the high-performance cleaning device, the belt wound on the mating roll of the respective single-felted shoe press is suitably equipped with a doctor blade in order to remove web residues and remove excess water from the transfer. The high-performance cleaning device and the doctor blade are preferably arranged opposite a discharge roll arranged downstream of the shoe press zone of the single-felted shoe press in order to achieve a corresponding support effect.
The separation of the wire or felt of the respective double-felted shoe press after the respective shoe press zone in the web running direction can be carried out by means of a suction felt guide roll, which is arranged in particular in the loop of the bottom felt. Preferably, the suction felt guide roller or a felt guide roller following in the direction of travel of the felt and arranged upstream of the tubular suction device is assigned a drive. It is also advantageous, in particular, for the suction felt guide roller to be wound by the relevant felt, in particular the base felt, over an angle of > 15 °, in particular > 30 °, preferably 40 °.
The transport distance of the fibrous web between adjacent suction felt guide rollers of the first and second shoe presses, viewed in the web running direction, and the transport distance of the fibrous web between adjacent suction felt guide rollers of the second and third shoe presses, viewed in the web running direction, are preferably respectively <900mm, in particular <750mm, preferably <600 mm.
Advantageously, too, the back wrap of the mating roll of the respective shoe press by the associated felt or belt after the shoe press zone is ≥ 20mm, in particular ≥ 45mm, preferably ≥ 70 mm.
The drive device is expediently assigned to one of the guide rollers around which the conveyor belt of the counter roller of the shoe press, around which the respective single-felted shoe press is wound, is guided.
The first dryer group of the dryer section, viewed in the web running direction, is advantageously of single-row design and has 4, in particular 3, preferably 2 dryer cylinders.
The belt and the felt wrapped around the mating roll of the corresponding single-felted shoe press can enter the single-felted shoe press zone in a particularly closed manner. Whereby even a weight per unit area of > 140g/m can be prevented2In which case the fibrous web falls.
It is also advantageous that the belt around the mating roll of the respective single felted shoe press comprises a base fabric similar to a drying screen, which is impregnated with polyurethane. Such a conveyor belt is cheaper than a belt formed on the basis of felt.
The surface roughness RZ, in particular in the web running direction, of the belt of the counter roll of the shoe press around which the respective single-felted shoe press is wound is preferably less than or equal to 12 μm, in particular less than or equal to 10 μm, preferably less than or equal to 8 μm.
The transport distance of the conveyor belt around the mating roll of the respective single-felted shoe press after its single-felted shoe press zone is advantageously 2.5m or less, in particular 2.Om or less, preferably 1.5m or less.
In some cases it is also advantageous if the wire or felt of the respective double-felted shoe press is separated in the web running direction after the respective shoe press zone by means of a separating suction. In this case, such a separating aspirator is provided, in particular, with five, preferably three, aspiration channels.
It is particularly advantageous if, when the clothing or felt of the respective double-felted shoe press is separated in the web direction after the respective shoe press zone by means of a separating suction, the transport distance after the separating suction to the next driven assembly for removing the fibrous web is 1600mm or less.
In particular when the clothing or the felt of the respective double-felted shoe press is separated in the web direction after the respective shoe press zone by means of a separating suction, it is preferred that the first guide roll assigned after the transport distance in the lower felt loop of the respective double-felted shoe press is provided with a drive.
In contrast to this, however, it is also conceivable to provide a design in which, in particular when the clothing or the felt of the respective double-felted shoe press is separated in the web direction by a separating suction after the respective shoe press zone, the guide roll which is assigned to the lower felt loop of the respective double-felted shoe press in the direction of travel of the felt, following the first guide roll of the transport distance, and which is arranged upstream of the tubular suction in the direction of travel of the felt, is assigned a drive.
Preferably, the respective wire or the separate suction felt guide roll of the felt arranged for the double-felted shoe press after the respective shoe press in the web running direction has at least two suction zones, at least one of which is designed as a high-vacuum zone. The respective suction felt guide roller preferably has three regions, two of which are designed as high-vacuum regions.
It is particularly advantageous here if the respective high-vacuum zone has a vacuum of > 35kPa, in particular > 45kPa, preferably > 50 kPa. Suitably, one of the guide rolls arranged in the belt loop of the respective single-felted shoe press after the shoe press zone of the single-felted shoe press is provided with a drive.
According to a further practical embodiment of the machine according to the invention, two discharge rolls are provided in the belt loop of the respective single-felted shoe press immediately after the single-felted shoe press zone thereof, on which, viewed in the direction of belt travel, first a high-performance device is arranged, followed by at least one belt scraper. The high-performance device and the at least one doctor preferably lie opposite one roll each, so that an optimum support for the components and sufficient space can be achieved.
The machine according to the invention is used in particular for producing a mass per unit area of 80g/m at a web running speed > 1000m/min2To 500g/m2Of moderate weightTo heavier wrappers and/or cardboard.
An embodiment of the machine according to the invention is described below with reference to the accompanying drawings, in which:
figure 1 shows a schematic of a quadruple felted TNFP press with a suction felt guide roller,
figure 2 shows a schematic of a quadruple felted TNFP press with separate suction,
figure 3 shows a schematic of a quadruple felted TNFP press followed by an offset press,
figure 4 shows a schematic of a TNFP press with quadruple felting coupled to a felting press,
fig. 5 shows a schematic view of an exemplary embodiment of the machine according to the invention with two shoe presses with respective double felting arranged one after the other in the web running direction and a shoe press with single felting arranged behind it in the web running direction as smoothing presses, with a smooth lower roll,
fig. 6 shows a schematic view of an exemplary embodiment of a machine according to the invention with two double-felted shoe presses arranged one after the other in the web running direction and a single-felted shoe press arranged behind it in the web running direction as smoothing press with a shoe press roll and a counter roll wound by a conveyor belt, which are arranged vertically one above the other, and
fig. 7 shows a schematic view of an exemplary embodiment of the machine according to the invention similar to the embodiment of fig. 6, wherein, however, the shoe press roll of the shoe press provided as a single-ply felting of the smoothing press and the counter roll wound by the conveyor belt are arranged on top of each other offset or inclined with respect to the vertical.
Fig. 5 to 7 each show schematically three exemplary embodiments of a machine 40 according to the invention for producing a fibrous web, in particular a packaging paper or cardboard web. The machine 40 here comprises two double-felted shoe presses 42 arranged one after the other in the web running direction L and a single-felted shoe press 44 arranged downstream of the two double-felted shoe presses 42 in the web running direction L and designed as a smoothing press. The respective shoe presses 42, 44 comprise an upper shoe press roll 46 and a lower mating roll 48. The shoe press roll 46 and the mating roll 48 of the at least two double felted shoe presses 42 are offset with respect to the vertical plane and arranged on top of each other at an inclination.
The separation of the wire or felt of the respective double-felted shoe press 42 in the web running direction after the respective shoe press zone takes place in each case by means of a suction felt guide roll 52 which is arranged in particular in the loop of the base felt.
In the embodiment shown in fig. 5, the lower mating roll 48 of the single felted shoe press 44, which is configured as a smoothing press, is configured as a smooth roll. Unlike the shoe press roll 46 and the mating roll 48 of the two previous shoe presses 42, the shoe press roll 46 and the smooth mating roll 48 of the single-weight felted shoe press 44, which is provided as a smoothing press, are arranged vertically one above the other. The fibrous web is guided through the shoe press zone of the shoe press 44, which is felted on one side, arranged as a smoothing press, together with the felt 54. After the shoe press zone, the fibrous web is carried by the smooth mating roll 48 of the single felting press 44 and removed from the smooth mating roll 48 by the drying screen 56 of the dryer group 58 of the subsequent dryer section.
A common pulper 60 is assigned to different locations of the machine 40 where waste occurs.
The embodiment of the machine 40 according to the invention shown in fig. 6 differs from that of fig. 5 above all in that the shoe press 44 of the single felting arranged as a smoothing press has a mating roll 48 wound by a conveyor belt 62 and that the fibrous web is taken off from the conveyor belt 62 by the drying screen 56 of the dryer group 58 of the subsequent drying section after the shoe press zone of the shoe press 44 of the single-sided felting arranged as a smoothing press. Here, in this embodiment according to fig. 6, the shoe press roll 46 and the mating roll of the shoe press 44, which is a single-felted shoe press arranged as a smoothing press, are arranged vertically on top of each other, so that an at least substantially horizontal nip is obtained.
In the embodiment according to fig. 7, the mating roll 48 opposite the shoe press roll 46 of the one-sided felted shoe press 44, which is arranged as a smoothing press, is in turn wrapped by a conveyor belt 62. Unlike the embodiment according to fig. 6, however, in this case the shoe press roll 46 and the mating roll 48, around which the conveyor belt 62 is wrapped, are offset or obliquely arranged one above the other with respect to the vertical plane, thus constituting a shoe press zone that is obliquely arranged with respect to the horizontal direction.
In all of the exemplary embodiments of the machine 40 according to the invention shown in fig. 5 to 7, a common pulper 60 is assigned to the machine 40 in each case at different locations where waste occurs.
In the embodiment according to fig. 5 a press section of the Tripple NipcoFlex press type is created with a smooth roll below in the third shoe press, and in both the embodiments of fig. 6 and 7 of the machine 40 according to the invention a press section of the Tripple NipcoFlex press type is created with a closed draw and a conveyor belt below in the third shoe press.
In the various exemplary embodiments of the machine 40 according to the invention shown in fig. 5 to 7, the accumulated waste material can be fed to the common pulper 60 via the first drying cylinder 64, respectively, as viewed in the web running direction L, in the event of a corresponding break in the fibrous web in the drying section. The first drying cylinder 64 of the drying section, viewed in the web running direction L, is provided with two doctor blades 66 for removing the fibrous web and for cleaning the drying cylinder 64.
List of reference numerals:
10 TNFP squeezer
12 shoe press
14 suction felt guide roller
16 separating aspirator
18 offset press
20 pulper
22 spreading presser
24 felt
26 suction felt guide roller
28 nip
30 smooth top roller
32 press roll
34 drying unit
40 machine
42 double felted shoe press
44 single felting shoe press
46 shoe press roll
48 mating rolls
50 felt
52 suction felt roller
52 felt
56 drying screen
58 drier set
60 pulper
62 conveyor belt
64 first drying cylinder
66 scraper
L web running direction
Claims (37)
1. A machine (40) for producing a fibrous web, in particular a packaging paper or cardboard web, has at least one, preferably two, double-felted shoe presses (42) arranged one after the other in the web running direction (L) and at least one single-felted shoe press (44), in particular designed as a smoothing press, arranged after the two double-felted shoe presses (42) in the web running direction (L).
2. The machine in accordance with claim 1, wherein,
it is characterized in that the preparation method is characterized in that,
the respective shoe press (42, 44) comprises an especially upper shoe press roll (46) and an especially lower mating roll (48).
3. The machine according to claim 1 or 2,
it is characterized in that the preparation method is characterized in that,
a linear force of more than or equal to 400kN/m, in particular more than or equal to 500kN/m, preferably more than or equal to 700kN/m, can be generated in the respective shoe press zone of the shoe press (42, 44), and/or the respective press shoe of the shoe press (42, 44) has a length of more than or equal to 250 mm.
4. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
at least one shoe press (44) of the single-felted design as a smoothing press comprises an in particular upper shoe press roll (46) and an in particular lower smooth counter roll (48), in particular provided with a ceramic surface or a hard rubber surface, wherein the shoe press roll (46) and the counter roll (48) are preferably arranged at least substantially vertically one above the other.
5. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
at least one shoe press (44) of single felting designed as a smoothing press comprises an especially upper shoe press roll (46) and an especially lower mating roll (48) which is wrapped by a conveyor belt (62).
6. The machine of claim 5, wherein the first and second rollers are mounted on a single frame,
it is characterized in that the preparation method is characterized in that,
the shoe press roll (46) and the mating roll (48) wound by the conveyor belt (62) are arranged at least substantially vertically on top of each other.
7. The machine of claim 5, wherein the first and second rollers are mounted on a single frame,
it is characterized in that the preparation method is characterized in that,
the shoe press roll (46) and the mating roll (48) wound by the belt (62) are arranged on top of each other offset or inclined with respect to the vertical plane.
8. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the fibrous web can be transferred in a closed web run to a dryer section by a belt (62) wrapped around a mating roll (48) of a single felted shoe press (44).
9. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the respective conveyor belt loop is guided without externally located guide rollers.
10. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the peak pressure in the shoe press zone of the last single felted shoe press (44) is equal to or greater than the peak pressure in the shoe press zone of the previous shoe press (42).
11. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
between successive shoe presses (42, 44), a web travel speed difference of 0.2% to 3.5% can be provided in each case, in order to guide the fibrous web through the shoe press zone and into the drying section without folds.
12. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
a common pulper (60) is associated with the machine (40) at different locations where waste occurs.
13. The machine in accordance with claim 12, wherein,
it is characterized in that the preparation method is characterized in that,
when the fibrous web breaks in the dryer section, the accumulated waste material can be conducted to a common pulper (60) by means of a first drying cylinder (64) as viewed in the web running direction (L).
14. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
a first drying cylinder (64) of the drying section, viewed in the web running direction (L), is provided with at least one, preferably two, doctor blades (66) for removing the fibrous web and for cleaning the drying cylinder (64).
15. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the horizontal distance between the centre of the first dryer cylinder (64) and the subsequent first stabilizing roll of the dryer section, viewed in the web running direction (L), is more than or equal to 80%, in particular more than or equal to 90%, preferably more than or equal to 95%, of the sum of half the diameters of the two rolls.
16. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
a high-performance cleaning device with at least one, preferably at least two rows of nozzles for generating at least two individual jets, respectively, is arranged on the conveyor belt (62) of the mating roll (48) of the shoe press (44) around the respective single felting, said jets impinging obliquely onto the conveyor belt surface from different directions.
17. The machine in accordance with claim 16 wherein,
it is characterized in that the preparation method is characterized in that,
the pressure of the nozzle of the high-performance cleaning device is greater than or equal to 50bar, in particular greater than or equal to 100bar, preferably greater than or equal to 120bar, and/or the diameter of the nozzle of the high-performance cleaning device is less than or equal to 0.7mm, in particular less than or equal to 0.5mm, preferably less than or equal to 0.3 mm.
18. The machine according to claim 16 or 17,
it is characterized in that the preparation method is characterized in that,
after the high-performance cleaning device, the conveyor belt (62) of the mating roll (48) wound around the respective single-felted shoe press (44) is provided with at least one scraper, wherein the high-performance cleaning device and the scraper are preferably arranged opposite the outfeed roll arranged after the shoe press zone of the single-felted shoe press (44).
19. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the separation of the clothing or the felt (50) of the respective double-felted shoe press (42) in the web running direction (L) after the respective shoe press zone takes place by means of a suction felt guide roll (52), which is arranged in particular in the loop of the base felt, wherein the suction felt guide roll (52) or a subsequent felt guide roll in the felt running direction, which is arranged upstream of the tubular suction device, is preferably equipped with a drive.
20. The machine in accordance with claim 19 wherein,
it is characterized in that the preparation method is characterized in that,
the suction felt guide rollers (52) are wound by the relevant felt, in particular the bottom felt, by an angle of more than or equal to 15 °, in particular more than or equal to 30 °, preferably more than or equal to 40 °.
21. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the transport distance of the fibrous web between the mutually adjacent suction felt guide rollers (52) of the first and second shoe presses (42) viewed in the web running direction (L) and the transport distance of the fibrous web between the adjacent suction felt guide rollers of the second and third shoe presses viewed in the web running direction (L) are respectively <900mm, in particular <750mm, preferably <600 mm.
22. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the back wrap of the mating roll (48) of the respective shoe press (42, 44) after the shoe press zone by means of the associated felt (50) or belt (62) is not less than 20mm, in particular not less than 45mm, preferably not less than 70 mm.
23. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
a drive device is associated around one of the guide rollers around which the conveyor belt (62) of the counter roller (48) of the shoe press (44) wound around the respective single-felted strand is guided.
24. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the first dryer group (58) of the drying section, viewed in the web running direction (L), is designed in a single row and has 4, in particular 3, preferably 2 dryer cylinders.
25. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the belt (62) and felt (54) wrapped around the mating roll (48) of the respective single-felted shoe press (44) enter the single-felted shoe press zone in a closed manner.
26. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the conveyor belt (62) around the mating roll (48) of the respective single felted shoe press (44) comprises a base fabric similar to a dryer screen, which is saturated with polyurethane.
27. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
surface roughness R, especially in the web running direction, of a belt (62) of a mating roll (48) of a shoe press (44) wound around a corresponding single feltZLess than or equal to 12 μm, in particular less than or equal to 10 μm, preferably less than or equal to 8 μm.
28. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the transport distance of the conveyor belt (62) of the counter roll (48) of the shoe press (44) around which the respective single-felted material is wound after the shoe press zone of its single-felted material is less than or equal to 2.5m, in particular less than or equal to 2.0m, preferably less than or equal to 1.5 m.
29. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the clothing or the felt (50) of the respective double-felted shoe press (42) is separated in the web running direction (L) after the respective shoe press zone by means of a separating suction, wherein the separating suction is provided in particular with five, preferably three suction slots.
30. The machine in accordance with claim 19 wherein,
it is characterized in that the preparation method is characterized in that,
when the clothing or the felt (50) of the respective double-felted shoe press (42) is separated in the web direction (L) after the respective shoe press zone by a separating suction, the transport distance after the separating suction to the next driven machine group for removing the fibrous web is less than or equal to 1600 mm.
31. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
in particular, when the clothing or the felt (50) of the respective double-felted shoe press (42) is separated in the web running direction (L) after the respective shoe press zone by means of a separating suction, the first guide roll assigned after the transport distance in the lower felt loop of the respective double-felted shoe press (42) is provided with a drive.
32. The machine of one of claims 1 to 30,
it is characterized in that the preparation method is characterized in that,
in particular, when the clothing or the felt (50) of the respective double-felted shoe press (42) is separated in the web running direction (L) after the respective shoe press zone by means of a separating suction, a guide roll which is arranged in the lower felt loop of the respective double-felted shoe press (42) in the direction of travel of the felt and is arranged upstream of the tubular suction is assigned a drive after the first guide roll following the transport distance.
33. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the respective separate suction felt guide roll (52) of the wire or felt (50) arranged for the double-felted shoe press (42) after the respective shoe press zone in the web running direction (L) has at least two suction zones, at least one of which is designed as a high-vacuum zone, wherein the suction felt guide roll (52) preferably has three suction zones, two of which are designed as high-vacuum zones.
34. The machine in accordance with claim 33, wherein,
it is characterized in that the preparation method is characterized in that,
the corresponding high-vacuum zone has a vacuum of > 35kPa, in particular > 45kPa, preferably > 50 kPa.
35. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
a drive is associated with one of the guide rolls arranged in the belt loop of the respective single-felted shoe press (44) after the shoe press zone of the single-felted shoe press.
36. The machine according to one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
two discharge rolls are provided in the belt loop of the respective single-felted shoe press (44) immediately after the shoe press zone of the single-felted shoe press, on which, viewed in the direction of belt travel, first a high-performance device is arranged, followed by at least one belt scraper, wherein the high-performance device and the at least one scraper are preferably each situated opposite one roll.
37. Use of a machine (10) according to one of the preceding claims for producing a mass per unit area of 80g/m at a web running speed > 1000m/min2To 500g/m2Medium to heavy paper and/or paperboard.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019116602.0A DE102019116602A1 (en) | 2019-06-19 | 2019-06-19 | MACHINE FOR THE MANUFACTURE OF A FIBER WEB |
| DE102019116602.0 | 2019-06-19 | ||
| PCT/EP2020/064662 WO2020254079A1 (en) | 2019-06-19 | 2020-05-27 | Machine for the production of a fibrous material web |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113994046A true CN113994046A (en) | 2022-01-28 |
Family
ID=70861489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080043991.5A Pending CN113994046A (en) | 2019-06-19 | 2020-05-27 | Machine for producing a fibrous web |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3987113A1 (en) |
| CN (1) | CN113994046A (en) |
| DE (1) | DE102019116602A1 (en) |
| WO (1) | WO2020254079A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4261346A1 (en) * | 2022-04-14 | 2023-10-18 | Billerud Aktiebolag (publ) | Production of paper- or linerboard |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6210530B1 (en) * | 1996-12-13 | 2001-04-03 | Voith Sulzer Papiermaschinen Gmbh | Press section and method for pressing with different shoe press lengths |
| EP1281806A2 (en) * | 2001-08-01 | 2003-02-05 | Voith Paper Patent GmbH | Press arrangement |
| EP1375740A1 (en) * | 2002-06-15 | 2004-01-02 | Voith Paper Patent GmbH | Pressing arrangement |
| WO2012007297A1 (en) * | 2010-07-14 | 2012-01-19 | Voith Patent Gmbh | Machine having a press section and method for producing a fiber web |
| CN109563683A (en) * | 2016-06-03 | 2019-04-02 | 福伊特专利有限公司 | For being dehydrated fibrous cloth width and dry machine |
| CN208701408U (en) * | 2014-11-28 | 2019-04-05 | 福伊特专利有限公司 | Equipment for manufacturing fibrous cloth width |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10137527A1 (en) * | 2001-08-01 | 2003-02-13 | Voith Paper Patent Gmbh | Rotogravure paper manufacturing assembly has additional press slits |
| WO2016083172A1 (en) * | 2014-11-28 | 2016-06-02 | Voith Patent Gmbh | Device for producing a fibrous web |
-
2019
- 2019-06-19 DE DE102019116602.0A patent/DE102019116602A1/en active Pending
-
2020
- 2020-05-27 WO PCT/EP2020/064662 patent/WO2020254079A1/en unknown
- 2020-05-27 CN CN202080043991.5A patent/CN113994046A/en active Pending
- 2020-05-27 EP EP20728740.0A patent/EP3987113A1/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6210530B1 (en) * | 1996-12-13 | 2001-04-03 | Voith Sulzer Papiermaschinen Gmbh | Press section and method for pressing with different shoe press lengths |
| EP1281806A2 (en) * | 2001-08-01 | 2003-02-05 | Voith Paper Patent GmbH | Press arrangement |
| EP1375740A1 (en) * | 2002-06-15 | 2004-01-02 | Voith Paper Patent GmbH | Pressing arrangement |
| WO2012007297A1 (en) * | 2010-07-14 | 2012-01-19 | Voith Patent Gmbh | Machine having a press section and method for producing a fiber web |
| CN208701408U (en) * | 2014-11-28 | 2019-04-05 | 福伊特专利有限公司 | Equipment for manufacturing fibrous cloth width |
| CN109563683A (en) * | 2016-06-03 | 2019-04-02 | 福伊特专利有限公司 | For being dehydrated fibrous cloth width and dry machine |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020254079A1 (en) | 2020-12-24 |
| EP3987113A1 (en) | 2022-04-27 |
| DE102019116602A1 (en) | 2020-12-24 |
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