CN110998021B - Machine and method for producing a fibrous web - Google Patents
Machine and method for producing a fibrous web Download PDFInfo
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- CN110998021B CN110998021B CN201880051885.4A CN201880051885A CN110998021B CN 110998021 B CN110998021 B CN 110998021B CN 201880051885 A CN201880051885 A CN 201880051885A CN 110998021 B CN110998021 B CN 110998021B
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- roll
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- fibrous web
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
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- 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
- D21F5/04—Drying on cylinders on two or more drying cylinders
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
- D21F5/181—Drying webs by hot air on Yankee cylinder
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/006—Calenders; Smoothing apparatus with extended nips
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Abstract
The invention relates to a machine for producing a fibrous web, in particular a paper or cardboard web, having a headbox, a forming unit, a press section, a pre-drying section, a MG-leveling and/or Yankee cylinder, a leveling device, a coating device and a winding system. Wherein the machine comprises a calendering unit with a multi-roll-soft-nip calender having at least one elastic nip and/or a shoe calender having a smooth press jacket.
Description
The invention relates to a machine for producing a fibrous web, in particular a paper or cardboard web, having a headbox, a forming unit, a press section, a predrying section, an MG smoothing and/or Yankee cylinder, a smoothing device, a coating device and a winding system. The invention also relates to a method for producing a fibrous web, in particular a paper or cardboard web, in particular for producing single-coated specialty papers, in particular using a machine of said type.
In the production of a fibrous web, for example a one-sided glossy paper, the web is guided after the press section to a large, steam-heated cylinder, a so-called MG leveling or yankee cylinder. On the one hand, such cylinders are used for drying paper webs. On the other hand, the paper web is flattened on its side facing the MG leveling or yankee cylinder by prolonged contact with the smooth and hot surface of the MG leveling or yankee cylinder. This is a critical production step in the production of single-sided glossy paper, so-called MG (machine glazed) paper. Specialty papers coated on one side (C1S) are currently manufactured on such MG machines. Such machines have only one smoothing cylinder (GZ) for drying the fibrous web. The throughput or speed of such machines is limited by the size of the leveling drum or the drying capacity. The diameter of the leveling roller is 6m, and the quantitative ratio of the cover and the base paper which are heated by air is 30-60g/m2In the case of (2), the maximum base paper yield is about 35t/m, d. In order to obtain a higher production of base paper of 70-80t/m, d, a pre-drying section before the levelling cylinder and a levelling cylinder with as large a diameter as possible are required. For reasons of Runability, i.e. for reasons of runnability, the leveling cylinder is located above, i.e. in contact with the underside of the web. A precoat is usually applied on the smooth underside and starch is applied on the back side using a film press (SpeedSizer film size press). The application of the top coat is carried out with a so-called blade coater and the curl control is carried out with a so-called LAS (Liquid application System), i.e. a special coating unit with an associated roller or nozzle humidifier for moistening the web. Furthermore, calendering is also carried out on the lower side with two to four or more soft nips in line at a line pressure of up to 350N/mm by means of a thermo roll having a surface temperature in the range of 150 ° to 200 °. The conventional high-power MG machine is formed by 28-40g/m of base paper2The weight per unit area (also referred to as a papermaking basis weight) of (2) is designed for a speed of 1200 m/min. The MG machine comprises a hydraulic headbox using dilution water technology, a fourdrinier wire with a mixing former and a shaking device, threeA duo centri nippo flex (i.e. a duo centri shoe press) press with a press nip, of which at least one is arranged as a shoe press nip, or a Tandem-nippo flex (i.e. a Tandem double shoe press) press with two shoe press nips arranged one after the other in the web running direction, a single and/or two rows of pre-drying sections, a levelling roll with a diameter of 6.4m, a supplementary drying section with a variable number of drying cylinders (or drying cylinders) arranged in two rows, a film press, a blade coater and a soft calender with a roll stack comprising five rolls and four nips.
A disadvantage of these high-power MG machines, which are currently customary, is that in the pre-drying section the web is dried on one side on the leveling cylinder, which leads to a moisture gradient in the web due to the high dry weight content of the web on the side pressed against the leveling cylinder. However, in order to achieve optimum gloss and smoothness, the humidity on the leveling roller side should be as high as possible.
Another disadvantage of such conventional MG machines is that the paper web is pressed against the leveling cylinder by means of a conventional press roll. The MG drum operates at different steam pressures depending on the weight per unit area and the production conditions. Furthermore, the line pressure of the press nip against the MG cylinder may vary over a wide range depending on the quality requirements. Conventional press rolls, even deflection-compensated rolls with steel jacket, do not sufficiently comply with the different deformation properties of flat cylinder jackets, which leads to different line pressure profiles along the width and uneven quality properties, in particular in terms of thickness, smoothness and gloss along the width.
Furthermore, calendering is not satisfactory in such conventional machines. In order to obtain the surface quality required for gravure printing and metallization, for example, vapor diffusion coating of aluminum, calenders with multiple nips, high load and high temperature are used. The high compression stress of the roll nip results in severe compression of the web, an undesirable reduction in stiffness and an undesirable smoothing of the backside.
The object of the invention is to provide a machine and a method of the type mentioned above, in which the above-mentioned disadvantages are eliminated and which enable the most efficient production of high-quality paper, in particular single-coated specialty paper.
According to the invention, the object is achieved by a machine having the features of claim 1 and a method having the features of claim 29. Preferred embodiments of the machine according to the invention and preferred embodiments of the method according to the invention result from the dependent claims, the description and the drawings.
The machine according to the invention for producing a fibrous web, in particular a paper or board web, comprises a headbox, a forming unit, a press section, a pre-drying section, a MG levelling and/or yankee cylinder, a coating device, a levelling device and a winding system. Wherein the machine comprises a calendering unit with a multi-roll-soft nip calender having at least one elastic nip and/or a shoe calender having a smooth press jacket.
Due to the design according to the invention, the machine is particularly suitable for the in-line production of single-coated specialty paper (C1S), wherein the machine ensures efficient production of high-quality paper.
Preferably, the multi-roll soft-nip calender comprises an elastic nip formed between a soft roll and a hard roll, wherein the soft roll is preferably arranged on the side of the fibrous web facing away from the MG-flat and/or yankee cylinder.
The shoe calender preferably comprises a shoe press roll with a smooth press sleeve and a heated counter roll, wherein the shoe press roll is preferably arranged on the side of the fibrous web facing away from the MG-flat and/or yankee cylinder.
Here, the shoe length of such a shoe calender
May especially be in the range of 60mm to 160mm and the line pressure of the shoe calender may especially be in the range of 400N/mm to 1200N/mm. The temperature of the surface of the heated counter roll may especially be in the range of 160 ℃ to 250 ℃. The moisture of the fibrous web on entering the shoe calender can be in particular in the range from 5% to 7%.
In some cases it may be sufficient that the calendering unit comprises only one shoe calender.
The calendering unit preferably comprises a multi-roll-soft-nip calender and/or a shoe calender with at least one and at most four roll nips. The web is thus flattened and compressed by high compressive stresses in the roll nip, so that the microroughness or respectively the nike (Bekk) smoothness is correspondingly improved. The macro-roughness or print surface roughness (PPS roughness) is improved by the finishing of the paper surface at elevated temperature for a longer dwell time in the shoe nip. Tests in the production of Label paper (Label paper) have shown that by means of a shoe calender followed by a multi-roll soft-nip calender, a significantly improved closed surface on the coated side of the fibrous web can be achieved without significant loss of volume. A multi-roll-soft-nip calender with only one roll nip may here for example comprise a roll set with two rolls, and a multi-roll-soft-nip calender with four roll nips may for example comprise a roll sub-set with five rolls or two roll sub-sets with three rolls each.
The shoe calender can be arranged before (or upstream of) the roll nip or after (or downstream of) the roll nip in the web running direction.
According to an advantageous practical embodiment, a multi-roll-soft-nip calender for example comprises a soft calender with a roll sub-set with three rolls and two nips.
In some cases, it may also be advantageous to provide means for varying the moisture of the fibrous web entering the calendering unit, wherein these means may in particular comprise steam blow boxes or the like.
According to an advantageous practical embodiment of the machine according to the invention, the pre-drying section comprises a dryer group with vertically successive, in particular steam-heated, drying cylinders for drying the web side of the fibrous web facing away from the MG-levelling and/or yankee cylinder.
In the closed web guidance, the drying unit with the drying cylinders connected in the vertical direction, which are especially steam-heated, changes from the drying underside to the drying upper side, and the moisture gradient moves, i.e., rises, toward the underside of the fibrous web. Thus, an optimum gloss and smoothness is obtained on the web side, while smoothing of the back side of the web is at least substantially avoided.
Preferably, the drying aggregate with drying cylinders successive in the vertical direction comprises two to four drying cylinders.
It is furthermore particularly advantageous if the pre-dryer section also comprises at least one single-row dryer group. Thus, a completely closed web guidance is maintained in the pre-dryer section.
The diameter of the MG leveling and/or yankee drum is advantageously greater than 6m, in particular greater than 6.6m and preferably greater than 7 m. The cylinder diameter can be 7.3m, for example. Furthermore, the MG levelling and/or yankee drum can be provided with at least one hood, in particular a gas-heated, preferably steam-heated hood, in particular a high-power hood. Such a smoothing and/or yankee drum ensures high drying power and high throughput.
Preferably, the fiber web is guided through the machine in a supported manner starting from the end of the press section up to the MG-leveling and/or yankee cylinder, whereby a correspondingly reduced risk of tearing of the fiber web occurs.
The headbox advantageously comprises a hydraulic headbox with dilution water technology, whereby a weight distribution per unit area of a flow can be achieved. The headbox can be provided with a spacing (Teilung) of, for example, 50mm or less transversely to the web running direction.
The forming unit preferably comprises a fourdrinier wire with a hybrid former and preferably a wire section shaking device, whereby good forming and a lower breaking length ratio l/q are achieved and thus a high dimensional stability or a low hygroscopic cross direction elongation is obtained.
According to a preferred practical embodiment of the machine according to the invention, the press section comprises at least one shoe press, preferably a single nipco flex press with only one shoe press nip, a duo centri nipco flex press with two roll nips and one shoe press nip or a Tandem nipco flex press with two shoe press nips arranged one after the other in the web running direction, whereby a high dry weight content and a high initial wet strength are achieved and it is ensured that no or at most a minimum open draw is present.
The transfer of the fibrous material web to the MG-levelling and/or yankee cylinder takes place in particular in the region of a pressure roller, preferably a shoe pressure roller, or a deflection-compensated roller with an elastic jacket, which bears against the MG-levelling and/or yankee cylinder, and which can be, for example, a so-called NipcoFullFlex roller (fully flexible roller with controlled roll gap), i.e. a deflection-compensated roller with a FullFlex jacket, which is a composite jacket that is significantly more flexible than a steel jacket or a casting jacket and can therefore be adapted better to the contour of the MG-levelling yankee cylinder. At the same time, the press sleeve is significantly more flexible than a steel or cast sleeve and can be better adapted to the contour of the MG drum. The NipcoFullFlex roll was also lifted from the shoe roll by: instead of a concave shoe as the support source (St ü tzelle), a plurality of convex support sources are used, which are closely spaced along the length of the roll (or the width of the machine) and arranged side by side. This jacket consists of a CFK (carbon fiber reinforced plastic) jacket with an outer coating consisting of polyurethane. Such a sleeve is more flexible than a steel or cast sleeve, so that it can better adapt to the varying contours of a counter-element, such as a MG plano-yankee cylinder. By means of such press rolls arranged on the MG levelling and/or yankee cylinder, good adaptation to the respective MG levelling or yankee cylinder deformation, a uniform linear pressure profile in the transverse direction and uniform quality properties in terms of thickness, smoothness and gloss are achieved.
It is also particularly advantageous if the smoothing device comprises a precalender, in particular a soft calender, a hard nip or a belt calender with a roll set comprising two rolls. A uniform compression and thickness calibration is achieved in particular by the soft calender mechanism.
It is also particularly advantageous if the machine comprises a film press for the surface treatment of the fibrous web. With such a film press, it is possible in particular to apply a precoat layer on the side of the fiber web facing the MG smoothing and/or yankee cylinder and to apply starch on the rear side of the fiber web.
It is also advantageous if the machine has a blade coater for the contactless application of a finishing coating to the fibrous web. In particular, a finish coating with a texture (profiling) can also be applied here. A uniform coating and good smoothness are ensured in particular by such a blade coater.
The machine also comprises one or more cooling drums, which have associated steam blow boxes for curl control. In this way, an efficient single-side rewetting of the fiber web is possible even without a subsequent drying cylinder.
According to an advantageous practical embodiment of the machine according to the invention, the press section comprises a duo centri nipco flex press with two roll nips and one shoe press nip corresponding to the central roll, a nipco flex press with only one shoe press nip and in particular an upper felt and a lower conveyor belt or a double-lay felt, or a Tandem-nipco flex press with two successive shoe press nips.
According to a further advantageous embodiment of the machine according to the invention, the press section may also comprise a so-called NipcoFullFlex roll with a press roll having a composite jacket. The composite sleeve of the NipcoFullFlex roll is significantly stiffer than the conventional polyamide sleeve. The active layer is wear resistant and temperature resistant.
The MG leveling and/or yankee cylinder is in contact with either the lower side or the upper side of the fibrous web. In this case, the MG smoothing and/or yankee drum is designed as an upside-down or an underside. In the case of a flat and/or yankee cylinder in contact with the lower side of the fibrous web, the vertically successive drying cylinders of the aforementioned associated drying aggregate preferably contact the upper side of the fibrous web, while in the case of an MG flat and/or yankee cylinder in contact with the upper side of the fibrous web, the vertically successive drying cylinders of the aforementioned associated drying aggregate preferably contact the lower side of the fibrous web. In both cases, however, at least one single-row dryer group can be provided before this.
The MG leveling and/or yankee drum is preferably provided with at least one hood, in particular heated by gas, preferably steam.
A supplementary drying section with at least one single-row and/or two-row dryer group can advantageously be arranged downstream of the MG smoothing and/or yankee cylinder in the web running direction.
In particular, for the curl correction, it is advantageous if the machine comprises a water film coating (or curtain coating) device with a downstream drying unit and/or a nozzle humidifier.
The method according to the invention for producing a fiber web, in particular a paper or cardboard web, is provided in particular for producing a single-coated specialty paper, wherein the method can be carried out in particular using the machine according to the invention. Wherein a fiber suspension fed by means of a headbox is dewatered in a forming unit to form a fiber web, which is further dewatered in a press section, predried in a predrying section, leveled in an MG leveling and/or Yankee cylinder and leveling device, coated in a coating device and wound in a winding system. According to the invention, the fibrous web is calendered by means of a calendering unit having a multi-roll soft-nip calender with at least one elastic nip and/or a shoe calender with a smooth press sleeve.
Preferably, the fibrous web with a dry weight content in the range of 45% to 55% is fed into a dryer group with dryer cylinders connected in the vertical direction.
It is also particularly advantageous if the fibrous web with a dry weight content in the range from 50% to 60% is discharged from a dryer group with vertically successive dryer cylinders.
The steam-heated drying cylinders of the dryer group with vertically successive drying cylinders are preferably each operated with a steam pressure in the range from 2.0bar to 6.0 bar.
Preferably produced with a viscosity of 20g/m2To 120g/m2Fibrous or paper or board webs of a base paper weight in the range.
Advantageously, 5g/m is applied to the side of the fiber web facing the MG smoothing and/or yankee cylinder2To 30g/m2Single-sided coating within the scope.
Advantageously produced with a density of 20g/m2To 150g/m2In the range and especially 30g/m2To 90g/m2A fibrous or paper or board web of a finished paper weight in the range.
It is also particularly advantageous if the fibrous or paper or board web is produced in the range of a maximum paper machine speed of 1500 m/min.
According to a further advantageous embodiment of the method according to the invention, a catalyst having a molar mass of less than 2.0: 1. in particular a breaking length ratio of less than 1.6: 1 and preferably less than 1.5: 1.
It is also advantageous if the fibrous web to be produced is guided through the production machine in a closed draw with a dry weight content of at least up to 60%.
Preferably, a fibrous web is produced having a roughness value of less than 0.6 μm on the coated side.
The invention is explained in detail below with reference to the drawings according to embodiments; in the drawings:
fig. 1a) and 1b) show schematic views of an exemplary embodiment of a machine for producing a fibrous web according to the present invention;
fig. 2 shows a partial schematic view of an exemplary embodiment of a machine according to the invention, which does not have a dryer group with vertically successive dryer cylinders, in a variant of the machine according to fig. 1a) and 1 b); and
fig. 3 shows a partial schematic view of a further exemplary embodiment of the machine according to the invention, which is modified with respect to the machine according to fig. 2.
Fig. 1 to 3 show various exemplary embodiments of a machine 10 according to the invention for producing a fibrous web 12, in particular a paper or cardboard web. The machine 10 is provided in particular for producing specialty paper coated on one side (C1S).
The pre-drying section 20 in the machine 10 shown in fig. 1a) and 1b) comprises a dryer group 30 having vertically successive, in particular steam-heated, drying cylinders 30', 30 ″, which cylinders 30', 30 ″ serve to dry the web side of the fibrous web 12 facing away from the MG smoothing and/or yankee cylinder 22.
The dryer group 30 with dryer cylinders connected in the vertical direction can comprise in particular two to four dryer cylinders, wherein in the present case the dryer group 30 has, for example, two such dryer cylinders 30', 30 ″.
Furthermore, the pre-dryer section 20 can comprise at least one dryer group 32 arranged in the web running direction L in a single row before or upstream of the dryer group 30 with dryer cylinders 30', 30 ″ following in the vertical direction.
The diameter of the MG smoothing and/or yankee drum 22 is in particular greater than 6m, wherein this diameter is in particular greater than 6.6m and preferably greater than 7 m.
The fibrous web 12 is guided in a supported manner through the machine 10 starting from the end of the press section 18 up to the MG smoothing and/or yankee cylinder 22. The headbox 14 may include, among other things, a hydraulic headbox having dilution water technology. The headbox can be provided with a spacing of less than or equal to 50mm transversely to the web running direction L. As shown, the forming unit 16 may include a fourdrinier wire 34 having a hybrid former 36 and preferably a wire section shaking device, wherein in this example a shaking device of a breast roll 38 is provided.
The press section 18 may include at least one shoe press 40, preferably a single nip flex press with only one shoe press nip, a duo centri nip flex press with two roll nips and one shoe press nip, or a Tandem nip flex press with two shoe press nips arranged in sequence in the web running direction L.
The transfer of the fibrous web 12 to the MG-flat and/or yankee cylinder 22 can take place in the region of a pressure roller 42, in particular a shoe pressure roller or deflection-compensated roller with an elastic sleeve, which bears against the MG-flat and/or yankee cylinder 22.
The levelling device 24 may comprise a pre-calender, such as a soft calender, a hard nip or a belt calender, in particular with a roll set comprising two rolls.
A film press 44 for the surface treatment of the fibrous web 12 can be arranged immediately after or downstream of the flattening device 24.
The coating device 26 may, for example, comprise a knife coater for applying a finish coating to the fibrous web 12.
One or more cooling drums 46 with associated steam blow boxes 48 can be arranged downstream or downstream of the application device 26 in the web running direction L.
The machine 10 furthermore has a calendering unit 50, which calendering unit 50 may comprise, inter alia, a multi-roll-soft-nip calender 52 with at least one elastic nip and/or a shoe calender 54 with a smooth press jacket. Here, the multi-roll-soft-nip calender 52 may, for example, comprise a soft calender mechanism having a roll sub-set with three rolls and two nips.
The press section 18 can also comprise, for example, a duo centri nippoflex press with two roll nips and one shoe press nip corresponding to a central roll or a nippoflex press with only one shoe press nip and in particular an upper felt and a lower conveyor belt or a double-layer laying felt or a Tandem-nippoflex press with two shoe press nips arranged one behind the other in the web running direction.
For example, a press section 18 with a nip fullflex roll with a press roll with a composite jacket is also conceivable.
In this case, the MG leveling and/or yankee cylinder 22 is, for example, in contact with the underside of the fiber web 12, wherein the MG leveling and/or yankee cylinder 22 is arranged on top of one another, or the fiber web 12 is guided upward to the MG leveling and/or yankee cylinder 22. In contrast, in the present example, vertically successive drying cylinders 30', 30 ″ of the drying aggregate 30 contact the upper side of the fibrous web 12.
The MG leveling and/or yankee drum 22 may be provided with at least one gas-heated, in particular steam-heated, hood 56.
A dryer section 58 with at least one single-row and/or two-row dryer group can be arranged downstream or downstream of the MG leveling and/or yankee cylinder 22 in the web running direction L.
For the curl correction, a water film application device with a downstream dryer group and/or a nozzle humidifier can be provided.
The press roller 42, which is designed in particular as a shoe press roller or deflection-compensated roller with an elastic sleeve, is arranged inside the loop of a conveyor belt or press felt 60, which conveyor belt or press felt 60 receives the fibrous web in the machine 10 according to fig. 1a) and 1b) from a clothing or drying wire 62 of the vertically successive drying cylinders 30', 30 ″ that guides the fibrous web through the drying aggregate 30.
Fig. 2 shows a detail of an exemplary embodiment of the machine 10 according to the invention, which is modified with respect to the machine according to fig. 1a) and 1b), the machine 10 not having a dryer group with vertically successive dryer cylinders, wherein the fibrous web 12 is transported from the single-row dryer group 32 to a further conveyor belt 64, the fibrous web 12 being transferred by the further conveyor belt 64 to a conveyor belt or press felt 60, which conveyor belt or press felt 60 contains the press roller 42 in its return loop. The machine according to fig. 2 can be designed at least substantially as the machine shown in fig. 1a) and 1b) again.
A further exemplary embodiment of the machine 10 according to the invention, which is only partially shown in fig. 3, differs from the machine according to fig. 2 at least substantially only in that the fibrous web 12 is removed directly from the last drying cylinder 66 of the aforementioned single-row drying aggregate 30 by means of a conveyor belt 60, the conveyor belt 60 comprising a pressure roller 42 in its return loop.
List of reference numerals
10 machine
12 fiber material web
14 headbox
16 Forming Unit
18 press section
20 predrying section
22 MG smoothing and/or Yankee roller
24 leveling device and pre-glazing press
26 coating device
28 winding system
30 drier set
30' drying cylinder
30' drying cylinder
32 single row dryer group
34 long net
36 mixing former
38 breast roll
40 shoe press
42 pressure roller
44 film press
46 cooling cylinder
48 steam blowing box
50 calendering unit
52 multiroll-soft nip calender
54 shoe calender
56 cover
58 supplementary drying section
60 conveyor belt or press felt
62-mesh blanket and drying mesh
64 conveyer belt
66 drying cylinder
L web running direction
Claims (32)
1. A machine (10) for producing a fibrous web (12) which is a single-side smooth coated paper web, with a headbox (14), a forming unit (16), a press section (18), a pre-drying section (20), an MG-smoothing and/or Yankee cylinder (22), a smoothing device (24), a coating device (26) and a winding system (28), wherein the machine (10) comprises a calendering unit (50) with a multi-roll-soft-nip calender (52) with at least one elastic nip and/or a shoe calender (54) with a smooth press jacket and the multi-roll-soft-nip calender (52) comprises an elastic nip formed between a soft roll and a hard roll,
characterized in that the soft roller is arranged on the side of the fiber web (12) facing away from the MG smoothing and/or Yankee cylinder (22).
2. A machine according to claim 1, characterized in that the shoe calender (54) comprises a shoe press roll with a smooth press sleeve and a heated counter roll, and/or that the calendering unit (50) comprises only one shoe calender (54).
3. Machine according to claim 2, wherein the shoe press roller is arranged on a side of the fibrous web (12) facing away from the MG-leveling and/or Yankee cylinder (22).
4. A machine according to claim 1, characterized in that the calendering unit (50) comprises a multi-roll-soft-nip calender (52) with at least one and at most four roll nips and a shoe calender (54).
5. A machine according to claim 4, characterized in that the shoe calender (54) is arranged before the roll nip in the web running direction (L) or that the shoe calender (54) is arranged after the roll nip in the web running direction (L).
6. Machine according to claim 1, characterized in that the multi-roll-soft-nip calender (52) comprises a soft calender mechanism with a roll set with three rolls and two nips and/or is provided with means for changing the moisture of the fibrous web (12) entering the calendering unit (50) and/or the pre-drying section (20) comprises a drying aggregate (30) with vertically successive drying cylinders (30', 30 ") for drying the web side of the fibrous web (12) facing away from the flattening and/or yankee cylinder (22).
7. Machine according to claim 6, characterised in that said means comprise a steam blow box or similar means.
8. Machine according to claim 6, characterized in that said drying cylinders (30', 30 ") are steam-heated.
9. Machine according to claim 6, characterized in that the drying aggregate (30) with drying cylinders (30', 30 ") successive in the vertical direction comprises two to four drying cylinders.
10. The machine according to claim 1, wherein the pre-drying section (20) further comprises at least one single-row dryer group (32), and/or the MG smoothing and/or Yankee cylinder (22) has a diameter of more than 6m, and/or the fibrous web (12) is guided through the machine (10) from the end of the press section (18) until the MG smoothing and/or Yankee cylinder (22) is supported.
11. Machine according to claim 10, characterized in that the MG levelling and/or yankee drum (22) has a diameter greater than 6.6 m.
12. Machine according to claim 10, characterized in that the MG levelling and/or yankee drum (22) has a diameter greater than 7 m.
13. The machine according to claim 1, characterized in that the headbox (14) comprises a hydraulic headbox with dilution water technology and/or the forming unit (16) comprises a fourdrinier wire (34) with a mixing former (36) and/or the press section (18) comprises at least one shoe press (40).
14. Machine according to claim 13, characterized in that the fourdrinier wire (34) is further provided with a wire shaking device.
15. Machine according to claim 13, characterized in that the shoe press (40) is designed as a single NipcoFlex press with only one shoe press nip, as a DuoCentri NipcoFlex press with two roll nips and one shoe press nip or as a Tandem NipcoFlex press with two shoe press nips arranged one after the other in the web running direction (L).
16. Machine according to claim 1, characterized in that the transfer of the fibrous web (12) to the MG-levelling and/or yankee cylinder (22) takes place in the region of a press roller (42) resting against the MG-levelling and/or yankee cylinder (22), and/or in that the levelling device (24) comprises a pre-press and/or in that the machine comprises a film press (44) for the surface treatment of the fibrous web.
17. Machine according to claim 16, characterized in that the press roll (42) is designed as a shoe press roll or a deflection-compensated roll with an elastic jacket.
18. Machine according to claim 16, characterized in that the press roll (42) is designed as a NipcoFullFlex roll having a shoe press roll with a composite jacket.
19. A machine according to claim 16, characterized in that the precalender is designed as a soft calender, a hard nip or a belt calender with a roll set comprising two rolls.
20. Machine according to claim 1, characterized in that it comprises a blade coater for applying a finishing coating onto a fibrous web (12) and/or it comprises one or more cooling cylinders (46) with an associated steam blow box (48) and/or the press section (18) comprises a duo centri nipco flex press with two roll nips and one shoe press nip corresponding to the central roll or a nipco flex press with only one shoe press nip and an upper and a lower conveyor belt or a double lay felt.
21. Machine according to claim 1, characterized in that the MG leveling and/or yankee cylinder (22) is in contact with the lower or upper side of the fibrous web (12) and/or that the MG leveling and/or yankee cylinder (22) is provided with at least one heated hood (56).
22. The machine of claim 21, wherein the hood (56) is gas heated.
23. The machine of claim 21, wherein the hood (56) is steam heated.
24. Machine according to claim 1, characterized in that a supplementary dryer (58) with at least one two-row dryer group is provided downstream of the MG-levelling and/or Yankee cylinder (22) in the web running direction (L) and/or the machine comprises a water film application device with a downstream dryer group and/or a nozzle humidifier.
25. Method for producing a fibrous web (12) which is a single-sided smooth coated paper web using a machine (10) according to one of the preceding claims, wherein a fibrous suspension which is fed in by means of a headbox (14) is dewatered in a forming unit (16) so as to form a fibrous web (12), the fibrous web (12) is further dewatered in a press section (18), predried in a predrying section (20), smoothed in an MG smoothing and/or Yankee cylinder (22) and a smoothing device (24), coated in a coating device (26) and wound in a winding system (28), wherein the fibrous web (12) is calendered by means of a calendering unit (50) having a multi-roll-soft-nip calender (52) and/or a shoe calender (54) having at least one elastic nip, the shoe calender has a smooth press sleeve, and the elastic nip of the multi-roll soft-nip calender (52) is formed between a soft roll and a hard roll,
characterized in that a soft roller is arranged on the side of the fiber web (12) facing away from the MG smoothing and/or Yankee cylinder (22).
26. The method according to claim 25, characterized in that the fibrous web (12) with a dry weight content in the range of 45 to 55% is fed into a drying aggregate (30) with vertically successive drying cylinders (30', 30 "), and/or the fibrous web (12) with a dry weight content in the range of 50 to 60% is fed out of a drying aggregate (30) with vertically successive drying cylinders (30', 30"), and/or the steam-heated drying cylinders (30', 30 ") of a drying aggregate (30) with vertically successive drying cylinders are operated with a steam pressure in the range of 2.0 to 6.0bar, respectively.
27. The method of claim 25, wherein the weight of the production base paper is at 20g/m2To 120g/m2In the region of the fiber web (12) or of the paper or cardboard web, and/or 5g/m is applied to the side of the fiber web (12) facing the MG-leveling and/or Yankee cylinder (22)2To 30g/m2In the range of a single-side coating and/or to produce a finished paper weight of 20g/m2To 150g/m2A fibrous web (12) or a paper or cardboard web in the region.
28. Method according to claim 27, characterised in that the finished paper weight is produced at 30g/m2To 90g/m2A fibrous web (12) or a paper or cardboard web in the region.
29. Method according to claim 25, wherein the fibrous web (12) or paper or board web is produced at a maximum paper machine speed in the range of 1500m/min and/or with a paper web having a paper thickness of less than 2.0: 1 ratio of breaking length of the fibrous web (12).
30. The method according to claim 29, characterized in that a fibrous web (12) is produced having a breaking length ratio of less than 1.6: 1.
31. Method according to claim 29, characterized in that a fibrous web (12) is produced having a breaking length ratio of less than 1.5: 1.
32. The method according to claim 25, characterized in that the fibrous web (12) to be produced is guided through the production machine (10) in a closed draw with a dry weight content of at least up to 60% and/or a fibrous web (12) is produced having a roughness value of less than 0.6 μm on the coated side.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017118222.5 | 2017-08-10 | ||
| DE102017118222.5A DE102017118222A1 (en) | 2017-08-10 | 2017-08-10 | MACHINE AND METHOD FOR PRODUCING A FIBROUS WEB |
| PCT/EP2018/065105 WO2019029863A1 (en) | 2017-08-10 | 2018-06-08 | Machine and method for producing a fibrous material web |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110998021A CN110998021A (en) | 2020-04-10 |
| CN110998021B true CN110998021B (en) | 2022-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880051885.4A Active CN110998021B (en) | 2017-08-10 | 2018-06-08 | Machine and method for producing a fibrous web |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3665325A1 (en) |
| CN (1) | CN110998021B (en) |
| DE (1) | DE102017118222A1 (en) |
| WO (1) | WO2019029863A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019132446A1 (en) * | 2019-11-29 | 2021-06-02 | Voith Patent Gmbh | Coating of fibrous webs |
| DE102020125395A1 (en) * | 2020-09-29 | 2022-03-31 | Voith Patent Gmbh | Machine and method for manufacturing a fibrous web |
| CN114161724B (en) * | 2021-11-15 | 2023-07-04 | 五洲特种纸业(江西)有限公司 | Antibacterial dampproof glassine paper and production method thereof |
| WO2024008405A2 (en) | 2022-07-05 | 2024-01-11 | Voith Patent Gmbh | Machine and method |
| DE202022104495U1 (en) | 2022-07-05 | 2022-09-01 | Voith Patent Gmbh | machine |
| DE102022119887A1 (en) | 2022-08-08 | 2024-02-08 | Voith Patent Gmbh | Machine and process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0383744A2 (en) * | 1989-02-17 | 1990-08-22 | Valmet Paper Machinery Inc. | Multi-cylinder dryer for paper machine with supported draw of web |
| WO2001051709A1 (en) * | 2000-01-07 | 2001-07-19 | International Paper Company | Paper product having enhanced printing properties and related method of manufacture |
| EP1780332A1 (en) * | 2005-10-28 | 2007-05-02 | Voith Patent GmbH | Apparatus and process for treating a fibrous web, especially a board or paper web |
| CN102472012A (en) * | 2009-08-13 | 2012-05-23 | 福伊特专利公司 | Method and device for producing paper |
| CN105378177A (en) * | 2013-07-17 | 2016-03-02 | 福伊特专利有限公司 | Clothing and method for producing a clothing |
| CN106996051A (en) * | 2015-11-09 | 2017-08-01 | 维美德技术有限公司 | Production line for producing fiber web |
-
2017
- 2017-08-10 DE DE102017118222.5A patent/DE102017118222A1/en active Pending
-
2018
- 2018-06-08 CN CN201880051885.4A patent/CN110998021B/en active Active
- 2018-06-08 WO PCT/EP2018/065105 patent/WO2019029863A1/en unknown
- 2018-06-08 EP EP18729960.7A patent/EP3665325A1/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0383744A2 (en) * | 1989-02-17 | 1990-08-22 | Valmet Paper Machinery Inc. | Multi-cylinder dryer for paper machine with supported draw of web |
| WO2001051709A1 (en) * | 2000-01-07 | 2001-07-19 | International Paper Company | Paper product having enhanced printing properties and related method of manufacture |
| EP1780332A1 (en) * | 2005-10-28 | 2007-05-02 | Voith Patent GmbH | Apparatus and process for treating a fibrous web, especially a board or paper web |
| CN102472012A (en) * | 2009-08-13 | 2012-05-23 | 福伊特专利公司 | Method and device for producing paper |
| CN105378177A (en) * | 2013-07-17 | 2016-03-02 | 福伊特专利有限公司 | Clothing and method for producing a clothing |
| CN106996051A (en) * | 2015-11-09 | 2017-08-01 | 维美德技术有限公司 | Production line for producing fiber web |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110998021A (en) | 2020-04-10 |
| WO2019029863A1 (en) | 2019-02-14 |
| DE102017118222A1 (en) | 2019-02-14 |
| EP3665325A1 (en) | 2020-06-17 |
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