CN110998021A - Machine and method for producing a fibrous web - Google Patents
Machine and method for producing a fibrous web Download PDFInfo
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- CN110998021A CN110998021A CN201880051885.4A CN201880051885A CN110998021A CN 110998021 A CN110998021 A CN 110998021A CN 201880051885 A CN201880051885 A CN 201880051885A CN 110998021 A CN110998021 A CN 110998021A
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- roll
- press
- fibrous web
- web
- nip
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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 material web, in particular a paper or cardboard web, comprising a headbox, a forming unit, a press section, a pre-drying section, an MG smoothing and/or Yankee cylinder, a smoothing 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 fibrous webs, for example, single-sided glossy paper, the paper web is guided after the press section to a large, steam-heated cylinder, a so-called MG smoothing 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-flattening or yankee cylinder by prolonged contact with the smooth and hot surface of the MG-flattening 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 gas is 30-60g/m2In the case of (2), the maximum base paper yield is about 35t/m, d. In order to obtain a higher raw paper yield of 70-80t/m, d, a pre-drying section before the flattening drum and a flattening drum with as large a diameter as possible are required. Out of RFor reasons of reliability, i.e. for runnability reasons, 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 prior common high-power MG machine is that the base paper has 28-40g/m2The weight per unit area (also referred to as a papermaking basis weight) of (2) is designed for a speed of 1200 m/min. Such MG machines comprise a hydraulic headbox using dilution water technology, a fourdrinier wire with a hybrid former and a shaking device, a duo centri npco flex (i.e. duo centri shoe press) press with three press nips, at least one of which is arranged as a shoe press nip, or a Tandem-nipco flex (i.e. 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 smoothing cylinder 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 set comprising five rolls and four nips.
A disadvantage of these high-power MG machines, which are conventional at present, is that in the predrying section the web is dried on one side on the leveling cylinder side, 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 cylinders operate 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 within wide limits according to 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.
Moreover, calendering is not satisfactory in such conventional machines. In order to obtain the surface quality required for gravure printing and metallization, e.g. vapor diffusion coating of aluminium, 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 aforementioned type 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-levelling 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 in the web running direction before (or upstream) or after (or downstream) the roll nip.
According to an advantageous practical embodiment, a multi-roll-soft-nip calender for example comprises a soft calender with a roll sub-group with three rolls and two nips.
In some cases, it may also be advantageous to provide means for changing the moisture of the fibrous web entering the calendering unit, wherein these means may in particular comprise a steam blow box 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 dryer group with vertically successive drying cylinders 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 levelling 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 fibrous web is guided supportingly through the machine starting from the end of the press section up to the MG-levelling and/or yankee cylinder, whereby a correspondingly reduced risk of tearing of the fibrous 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 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 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 open draw or at most a minimum open draw is present.
The transfer of the fibrous material web to the MG-flattening and/or yankee cylinder takes place in particular in the region of a press roll, preferably a shoe press roll or a deflection-compensated roll with an elastic jacket, which bears against the MG-flattening and/or yankee cylinder, and the deflection-compensated roll with the elastic jacket can be, for example, a so-called nippo FullFlex roll (fully flexible roll with controlled roll gap), i.e. a deflection-compensated roll with a FullFlex jacket, which is a composite jacket that is considerably more flexible than a steel or cast jacket and can therefore be better adapted to the profile of the MG-flattening yankee cylinder, while the press jacket is considerably more flexible than a steel or cast jacket and can be better adapted to the profile of the MG-flattening cylinder.
It is also particularly advantageous if the levelling device comprises a precalender, in particular a soft calender, a hard nip or a belt calender with a roll set comprising two rolls. Uniform compression and thickness calibration are 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 finish coating to a 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 a 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 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 levelling and/or yankee drum is designed as an overhead or underneath type. 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 levelling 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 levelling 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 with a multi-roll soft-nip calender having at least one elastic nip and/or a shoe calender having 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 vertically successive drying cylinders.
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 density 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/m2Fibrous or paper or board webs 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, the product has a mass fraction of less than 2.0: 1. in particular a ratio of breaking lengths 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 present invention is described in detail below with reference to the accompanying 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 comprise, inter alia, a hydraulic headbox with 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 comprise 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 succession in the web running direction L.
The transfer of the fibrous web 12 to the MG-levelling 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-levelling 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.
Coating device 26 may, for example, comprise a knife coater for applying a finish coating to 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 in particular comprise 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 stack 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 hood 56 for gas heating, in particular steam heating.
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 again, 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 the conveyor belt 60, which conveyor belt 60 contains the pressure roller 42 in its return loop.
List of reference numerals
10 machine
12 fiber material web
14 headbox
16 shaping 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 (15)
1. A machine (10) for producing a fibrous web (12), in particular a paper or cardboard web, having 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),
characterized in that the machine (10) comprises a calendering unit (50) with a multi-roll-soft-nip calender (52) having at least one elastic nip and/or a shoe calender (54) having a smooth press jacket.
2. The machine according to claim 1, characterized in that the multi-roll-soft-nip calender (52) 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 (12) facing away from the MG-flattening and/or Yankee cylinder (22), and/or the shoe calender (54) comprises a shoe press roll with a smooth press jacket and a heated counter roll, wherein the shoe press roll is preferably arranged on the side of the fibrous web (12) facing away from the MG-flattening and/or Yankee cylinder (22), and/or the calendering unit (50) comprises only one shoe calender (54).
3. Machine according to at least one of the preceding claims, 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), wherein the shoe calender (54) is preferably arranged in front of a roll nip in the web running direction (L) or the shoe calender (54) is preferably arranged behind a roll nip in the web running direction (L).
4. Machine according to at least one of the preceding claims, characterized in that the multi-roll-soft-nip calender (52) comprises a soft calender mechanism having a roll set with three rolls and two nips, and/or provided with means for varying the moisture of the fibrous web (12) entering the calendering unit (50), wherein the device preferably comprises a steam blow box or the like, and/or the pre-drying section (20) comprises a drying aggregate (30) with drying cylinders (30' ) connected in a vertical direction, in particular steam-heated, for drying the web side of the fibrous web (12) facing away from the smoothing and/or yankee cylinder (22), the drying aggregate (30) with vertically successive drying cylinders (30' ) preferably comprises two to four drying cylinders.
5. The machine according to at least one of the preceding claims, characterized in that the pre-drying section (20) further comprises at least one single-row drying aggregate (32), and/or the diameter of the MG leveling and/or Yankee cylinder (22) is larger than 6m, in particular larger than 6.6m and preferably larger than 7m, and/or the fibrous web (12) is guided through the machine (10) from the end of the press section (20) until the MG leveling and/or Yankee cylinder (22) is supported.
6. The machine according to at least one of the preceding claims, 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 preferably a wire shaking device, and/or the press (18) comprises at least one shoe press (40), preferably a single NipcoFlex press with only one shoe press nip, a DuoCentri NipcoFlex press with two roll nips and one shoe press nip, or a TandemNipcoFlex press with two shoe press nips arranged one after the other in the web running direction (L).
7. The machine according to at least one of the preceding claims, characterized in that the transfer of the fibrous web (12) to the MG-leveling and/or yankee cylinder (22) takes place in the region of a press roll (42), in particular a shoe press roll or a deflection-compensated roll with an elastic sleeve, preferably a NipcoFullFlex roll, which bears against the MG-leveling and/or yankee cylinder (22), which has a shoe press roll with a composite sleeve, and/or in that the leveling device (24) comprises a pre-calender, in particular a soft calender, a hard nip or a belt calender with a roll set comprising two rolls, and/or in that the machine comprises a film press (40) for the surface treatment of the fibrous web.
8. Machine according to at least one of the preceding claims, characterized in that the machine comprises a blade coater for applying a finishing coating onto a fibrous web (12) and/or the machine comprises one or more cooling cylinders (46) with an associated steam blow box (48) and/or the press section (18) comprises a duo centri NipcoFlex press with two roll nips and one shoe press nip corresponding to a central roll or a NipcoFlex press with only one shoe press nip and in particular an upper and a lower belt or a double layer laying felt.
9. Machine according to at least one of the preceding claims, characterized in that the MG leveling and/or yankee cylinder (22) is in contact with the lower side 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 hood (56), in particular gas-heated, preferably steam-heated.
10. Machine according to at least one of the preceding claims, characterized in that a supplementary drying section (58) with at least one two-row dryer group is provided downstream of the MG smoothing 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.
11. Method for producing a fibrous web (12), in particular a paper or cardboard web, in particular using a machine (10) according to at least one of the preceding claims, in particular for producing a single-coated specialty paper, wherein a fibrous suspension fed in by means of a headbox (14) is dewatered in a forming unit (16) in order to form the fibrous web (12), the fibrous web (12) is further dewatered in a press section (18), predried in a predrying section (20), leveled in an MG leveling and/or yankee cylinder (22) and leveling device (24), coated in a coating device (26) and wound in a winding system (28),
characterized in that the fibrous web (12) is calendered by means of a calendering unit (50) with a multi-roll soft-nip calender (52) having at least one elastic nip and/or a shoe calender (54) having a smooth press sleeve.
12. Method according to claim 11, 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 the drying aggregate (30) with vertically successive drying cylinders are operated with a steam pressure in the range of 2.0bar to 6.0bar, respectively.
13. Method according to at least one of the preceding claims, characterized in that the weight of the production base paper is at 20g/m2To 120g/m2In the region of the fibrous web (12) or of the paper or cardboard web, and/or 5g/m is applied to the side of the fibrous web (12) facing the MG-smoothing 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/m2In the range and especially at 30g/m2To 90g/m2A fibrous web (12) or a paper or cardboard web in the region.
14. Method according to at least one of the preceding claims, characterized in that the fibrous web (12) or paper or board web is produced in a range with a maximum paper machine speed of 1500m/min and/or with a paper web having a cross section of less than 2.0: 1. in particular a fiber web (12) with a breaking length ratio of less than 1.6: 1 and preferably less than 1.5: 1.
15. Method according to at least one of the preceding claims, 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 that the fibrous web (12) is produced with a roughness value of less than 0.6 μm on the coated side.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017118222.5A DE102017118222A1 (en) | 2017-08-10 | 2017-08-10 | MACHINE AND METHOD FOR PRODUCING A FIBROUS WEB |
| DE102017118222.5 | 2017-08-10 | ||
| 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 true CN110998021A (en) | 2020-04-10 |
| CN110998021B CN110998021B (en) | 2022-07-22 |
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| 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114161724A (en) * | 2021-11-15 | 2022-03-11 | 衢州五洲特种纸业股份有限公司 | Antibacterial and moistureproof glassine paper and production method thereof |
| CN114318930A (en) * | 2020-09-29 | 2022-04-12 | 福伊特专利有限公司 | Machine and method for producing a fibrous web |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019132446A1 (en) * | 2019-11-29 | 2021-06-02 | Voith Patent Gmbh | Coating of fibrous webs |
| AT17730U3 (en) | 2022-07-05 | 2023-02-15 | Voith Patent Gmbh | machine and process |
| DE102022119887A1 (en) | 2022-08-08 | 2024-02-08 | Voith Patent Gmbh | Machine and process |
| WO2024008405A2 (en) | 2022-07-05 | 2024-01-11 | Voith Patent Gmbh | Machine and method |
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 WO PCT/EP2018/065105 patent/WO2019029863A1/en unknown
- 2018-06-08 CN CN201880051885.4A patent/CN110998021B/en active Active
- 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114318930A (en) * | 2020-09-29 | 2022-04-12 | 福伊特专利有限公司 | Machine and method for producing a fibrous web |
| CN114161724A (en) * | 2021-11-15 | 2022-03-11 | 衢州五洲特种纸业股份有限公司 | Antibacterial and moistureproof glassine paper and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019029863A1 (en) | 2019-02-14 |
| EP3665325A1 (en) | 2020-06-17 |
| DE102017118222A1 (en) | 2019-02-14 |
| CN110998021B (en) | 2022-07-22 |
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| Pikulik | 1.1 Approach Flow System The forming process is preceded by an approach flow system that receives the aqueous fiber suspension, or stock, and prepares it for the forming process. Fibres are produced using kraft process or other pulping/bleaching processes (see Bleaching of wood pulps) and the proportions of fibers from different sources are blended here. Drained water from the forming process, known as whitewater, contains useful fibrous material and is continuously recycled back into the stock. Screens and centrifugal cleaners in the approach flow system remove oversize and heavy contaminants from the pulp. Additives such as minerals, pigments and dyes are introduced to make particular grades of paper and paper board. Air bubbles may be removed from the pulp suspension. The mass concentration, or consistency, of the suspension is kept low to prevent fibre flocculation prior to forming and is usually adjusted to a value in the range of 0.5 to 1.5%. |
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