EP3848503B1 - Dryer for drying coated fiber webs - Google Patents

Dryer for drying coated fiber webs Download PDF

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Publication number
EP3848503B1
EP3848503B1 EP20213721.2A EP20213721A EP3848503B1 EP 3848503 B1 EP3848503 B1 EP 3848503B1 EP 20213721 A EP20213721 A EP 20213721A EP 3848503 B1 EP3848503 B1 EP 3848503B1
Authority
EP
European Patent Office
Prior art keywords
air
dryer
fiber web
drying
compartments
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20213721.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3848503A1 (en
Inventor
Sari BEHM
Sampo IMMONEN
Eveliina KARJALA
Juha Kivimaa
Juha KOVANEN
Matti Lares
Petri LEWANDOWSKI
Seppo Luomi
Mikko MAJAMÄKI
Antti MÄNTYNEN
Richard Solin
Hans Sundqvist
Toni TIKKA
Mika Viljanmaa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Valmet Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Publication of EP3848503A1 publication Critical patent/EP3848503A1/en
Application granted granted Critical
Publication of EP3848503B1 publication Critical patent/EP3848503B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • 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
    • D21F5/185—Supporting webs in hot air dryers
    • D21F5/187—Supporting webs in hot air dryers by air jets
    • D21F5/188—Blowing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/32—Arrangements for turning or reversing webs
    • 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
    • D21F5/185—Supporting webs in hot air dryers
    • 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
    • D21F5/185—Supporting webs in hot air dryers
    • D21F5/187—Supporting webs in hot air dryers by air jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
    • F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/108—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials using one or more blowing devices, e.g. nozzle bar, the effective area of which is adjustable to the width of the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/517—Drying material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/172—Composite material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/176—Cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/84—Paper-making machines

Definitions

  • present invention relates to dryers for drying coated fiber webs in connection with producing coated fiber webs in a production line for coated fiber webs, in particular with producing coated board webs, more particularly with producing coated board webs of folding box board grades. More especially the present invention relates to a dryer according to preamble part of the independent dryer claim.
  • a typical production line comprises a forming section comprising a head box and a forming unit and a press section as well as a subsequent drying section and a reel-up.
  • the production a line can further comprise other devices and sections for finishing the fiber web, for example, a size press, a calender, a coating section.
  • the production and treatment line also comprises typically at least one winder for forming customer rolls as well as a roll packaging apparatus. The length of the production line is thus typically very long in machine direction and thus requires a lot of space.
  • Fiber webs especially paper and board are available in a wide variety of types and can be divided according to basis weight in two grades: papers with a single ply and a basis weight of 25-300 g/m 2 and boards manufactured in multiply technology and having a basis weight of 150-600 m/m 2 .
  • the borderline between paper and board is flexible since board grades with lightest basis weights are lighter than the heaviest paper grades.
  • paper is used for printing and board for packaging.
  • the main carton board grades are folding boxboard (FBB), white-lined chipboard (WLC), solid bleached board (SBS) and liquid packaging board (LPB). In general, these grades are typically used for different kinds of packaging of consumer goods.
  • Carton board grades vary from one- up to five-ply boards (150-400 g/m 2 ).
  • the top side is usually coated with from one to three layers (20-40 g/m 2 ), the back side has less coating or no coating at all.
  • FBB has the highest bulk thanks to the mechanical or chemi-mechanical pulp used in the middle layer of the base board.
  • Coated fiber web grades and coating are becoming more and more popular and thus the coating process and equipment have increasing demands imposed thereon.
  • coating especially in pigment coating, the surface of a fiber web is formed with a layer of coating color (coating substance) at a coating station followed by drying.
  • the process of coating can be divided in supplying the coating color onto the web surface, which is called the application of the coating color, as well as in the adjustment of final amount of coating color.
  • the coating of paper and board web typically utilize a coating device - a coater.
  • different kinds of coating technology are employed in prior art arrangements, for example pond technology or film-transfer technology or spray technology or blade technology.
  • curtain application which is suitable to surface treatment of paper and board webs. By curtain application good coverage of treatment substance on the web surface is achieved.
  • a dryer for drying coated fiber webs is for example known from EP 3 231 937 A1 .
  • An object of the invention is to create a dryer for drying coated fiber webs, in which the disadvantages and problems of prior art are eliminated or at least minimized.
  • An object of the invention is to create an improved dryer for drying coated fiber webs, in which efficient contactless drying of coated fiber web is achieved.
  • a particular object of the invention is to create a dryer, in which the disadvantages and problems of prior art relating to space requirement in machine direction, especially due to drying after coating, are eliminated or at least minimized.
  • the dryer according to the invention is mainly characterized by the features of the characterizing clause of the independent dryer claim.
  • Advantageous embodiments and features are disclosed in the dependent claims.
  • the dryer for drying coated fiber webs comprises three air compartments configured to provide drying air blows towards passing fiber web; two of the air compartments are substantially rectangular chambers and located next to each other with two longitudinal sides towards each other; third air compartment is a turning air compartment located with a straight surface towards upper surfaces of the two rectangular air compartments having a substantially curved outer, advantageously semi-circular, outer surface;
  • the dryer is configured to form a first longitudinal drying run for the fiber web in a first vertical portion, a curved drying run for the fiber web in a turning portion and a second longitudinal drying run for the fiber web in a second vertical portion; and the dryer further comprises along the vertical portions at a distance from the air compartments at least one blow device configured to provide support air blows to support the run of the passing fiber web; and the rectangular air compartments comprise an inlet channel and two outlet channels and the inlet channel is located in between the outlet channels in length direction of the rectangular air compartment.
  • the dryer is a double-pass dryer configured to a U-shaped air dryer with an air turn.
  • maximum blowing drying air temperature of the dryer is 500°C and minimum blowing drying air temperature is 50°C, advantageously 70°C.
  • each air compartment is individually adjustable to provide three drying temperature zones for drying the fiber web.
  • the air compartments and the blow devices comprise overpressure-nozzles, that on the substantially vertical portion of the rectangular air compartments the nozzles for air blows are at a spacing of 200 - 450 mm and that the nozzles of the blow devices are at a spacing of 300 - 1200 mm, advantageously at a spacing of 600 - 1200 mm, from each other.
  • the air equipment configuration of the dryer comprises separate air circulating equipment for the rectangular air compartments forming the vertical portions and the semi-circular, turning air compartment forming the curved, turning portion has its own air circulating equipment.
  • the air circulating equipment for the vertical portions are in a cascade connection.
  • the air equipment configuration of the dryer comprises common air circulating equipment for the rectangular air compartments forming the vertical portions and the semi-circular, turning air compartment forming the curved, turning portion has its own air circulating equipment.
  • the air equipment configuration of the dryer comprises separate supply air system for the blow devices providing support air flows to support the run of the passing fiber web.
  • the improved dryer for drying coated fiber webs provides efficient contactless drying of coated fiber web and improved production line for coated fiber web shorter than known production lines for coated fiber webs and thus, considerable space savings in machine line direction of the production line are achieved.
  • the advantageous configuration of the rectangular air compartments of the dryer provides that over all width in running direction of the fiber web is decreased by a third.
  • Advantageously also three individually controllable drying zones can be used and thus, quality and energy consumption can be optimized.
  • improved usability of layout options for example in view of tail threading, are provided.
  • FIG 1 is shown as a schematical cross-sectional view an example of a dryer 80 for drying coated fiber webs W.
  • the dryer 80 extends substantially over the width of the fiber web i.e. in cross-direction in respect of the main running direction S of the fiber web W.
  • the dryer 80 is located after a coater.
  • the fiber web W is dried by contactless drying.
  • the dryer 80 comprises three air compartments 81, 82, 83 forming chambers of the dryer 80.
  • Each air compartment 81, 82, 83 is advantageously individually adjustable.
  • three drying temperature zones for drying the fiber web can be provided.
  • Two of the air compartments 81, 82 are substantially rectangular air chambers and located next to each other with two longitudinal "back" sides towards each other i.e. the sides without nozzles are located towards each other and the sides with nozzles towards the passing fiber web W, and the third air compartment 83, a turning air compartment, as a substantially curved outer, advantageously semi-circular outer surface and the third air compartment 83 is located with the straight surface towards the upper surfaces of other two air compartments 81, 82.
  • Radius of the curved air compartment 83 is advantageously 800 - 1200 mm.
  • the height of the rectangular air compartments 81, 82 in the main running direction S of the fiber web W is advantageously 800 - 1200 mm.
  • Rectangular air compartments 81, 82 have advantageously width of 2,4 - 11 m in perpendicular direction in respect of the main running direction S of the fiber web W and length of 5 - 6 m i.e. in upwards direction of the plane of the main running direction S of the fiber web W.
  • the configuration of the dryer 80 is thus such, that the fiber web W has first a longitudinal run in a vertical portion 87, in the figure upwards, thereafter a semi-circular run in a curved, turning portion 89 and next another longitudinal run in another vertical portion 88, in the figure downwards.
  • the dryer 80 comprises thus the vertical portions 87, 88 and the curved, turning portion 89.
  • Each air compartment 81, 82, 83 comprises one, pressurized air blow channel 84, inlet channel 84, for proving drying air for drying the passing fiber web W and the rectangular air compartments 81, 82 comprise two outlet channels 86 for removing the moist air from the drying area and the curved, turning air compartment 83 comprises one outlet channel 86.
  • the inlet channel 84 is located in between the two outlet channels 86.
  • Each rectangular air compartment 81, 82 have in the middle of the vertical portion the inlet, i.e. air blow channel 84 and at the area of each end an outlet channel 86.
  • the blow devices 85 provide support air blows to support the run of the passing fiber web W i.e. the air blows keep the fiber web at a suitable distance from the air compartments 81, 82 corresponding nozzle sides.
  • the dryer 80 is a double-pass dryer 81, 82; 87,88 configured to a U-shaped air dryer with an air turn 83; 89.
  • the drying air of the dryer 80 can also be gas or steam.
  • the maximum blowing air temperature is advantageously about 500°C and the minimum blowing air temperature is 50°C, advantageously 70°C.
  • Various types of nozzles can be used in connection with the air compartments 81, 82, 83 and the blow devices 85, advantageously the nozzles are overpressure-nozzles.
  • the nozzles for air blows are at a spacing for example 200 - 450 mm from each other.
  • the nozzles of the blow devices 85 have advantageously a longer spacing from each other than the nozzles of the vertical portions 87, 88, advantageously the spacing is 300 - 1200 mm, more advantageously 600 - 1200.
  • FIGS 2A-2B is schematically shown an example of a rectangular air compartment 81; 82 of the dryer 80.
  • the air compartments 81, 82 are substantially rectangular air chambers having back side 93, nozzle side 92 and side ends 94 and front and back ends 95 of which front and back ends 95 only one is marked in the cut-view of the figure 2 .
  • the longitudinal "back" side 93, the upper side 93 in the figure 2 , or the rectangular air compartment 81; 82 is towards the other rectangular air compartment 82; 81 i.e. the sides without nozzles of the two rectangular air compartments 81; 82 of the dryer 80 are located towards each other.
  • the side 92 with nozzles 91 of the rectangular air compartment 81; 82 is towards the passing fiber web W.
  • the height H of the rectangular air compartments 81, 82 in the main running direction S of the fiber web W is advantageously 800 - 1200 mm.
  • Rectangular air compartments 81, 82 have advantageously width of 2,4 - 11 m in perpendicular direction in respect of the main running direction S of the fiber web W and length of 5 - 6 m i.e. in upwards direction of the plane of the main running direction S of the fiber web W.
  • the air compartment 81; 82 comprises one, pressurized air blow channel 84, the inlet channel 84, for proving drying air via the nozzles 91 for drying the passing fiber web W and two outlet channels 86 for removing the moist air from the drying area.
  • the inlet channel 84 is located in between the two outlet channels 86.
  • the rectangular air compartment 81; 82 has in the middle of the vertical portion the inlet, i.e. air blow channel 84 and at the area of each end an outlet channel 86.
  • nozzles 91 can be used in connection with the air compartments 81, 82, advantageously the nozzles are overpressure-nozzles.
  • the nozzles 91 for air blows towards the fiber web are at a spacing for example 200 - 450 mm from each other.
  • air equipment configurations for the dryer 80 In the examples of figures 3A-3C air equipment configurations for the air compartments 81, 82, 83 comprise air circulating equipment 98 with air inlets 84 to each air compartment 81, 82 83 and two air outlets 86 from each rectangular air compartment 81, 82 and one air outlet 86 from the semi-circular, turning air compartment 83.
  • the air equipment configurations also comprise a heating unit 97 and they may also comprise a heat recovery unit 99.
  • the air equipment configuration comprises separate air circulating equipment 98 for the rectangular air compartments 81, 82 forming the vertical portions 87, 88.
  • the air equipment configuration comprises common air circulating equipment 98 for the rectangular air compartments 81, 82 forming the vertical portions 87, 88.
  • the air equipment configuration comprises separate air circulating equipment 98 for the rectangular air compartments 81, 82 forming the vertical portions 87, 88 and the semi-circular, turning air compartment 83 forming the curved, turning portion 89 has its own air circulating equipment 98.
  • the air circulating equipment 98 for the vertical portions 87, 88 of the example of figure 3C are in a cascade connection such that exhaust air of first, in running direction of the fiber web, rectangular air compartment 81 is guided to second, in running direction of the fiber web, rectangular air compartment 82 as replacement air to optimize energy efficiency.
  • the air equipment configuration comprises separate air circulating equipment for the rectangular air compartments 81, 82 forming the vertical portions 87, 88 and the semi-circular, turning air compartment 83 forming the curved, turning portion 89 has its own air circulating equipment.
  • the blow devices 85 on the vertical portions 87, 88 providing support air flows to support the run of the passing fiber web W comprise their own, separate supply air system 96 and advantageously hot air from heat recovery system 99 is mixed to the blowing air.
  • This configuration is very advantageous in case different fiber web grades are produced and thus different temperature for the air blow from the rectangular air compartments 81, 82 of the dryer 80 can be used.
  • the air equipment configuration comprises common air circulating equipment for the rectangular air compartments 81, 82 forming the vertical portions 87, 88 and the semi-circular, turning air compartment 83 forming the curved, turning portion 89 has its own air circulating equipment.
  • the blow devices 85 on the vertical portions 87, 88 providing support air flows to support the run of the passing fiber web W comprise their own, separate supply air system 96 and advantageously hot air from heat recovery system 97 is mixed to the blowing air. This configuration is very cost effective as savings in equipment needed are achieved.
  • the air equipment configuration comprises separate air circulating equipment for the rectangular air compartments 81, 82 forming the vertical portions 87, 88 and the semi-circular, turning air compartment 83 forming the curved, turning portion 89 has its own air circulating equipment.
  • the air circulating equipment for the vertical portions 87, 88 of the example of figure 3C are in a cascade connection such that exhaust air of first, in running direction of the fiber web, rectangular air compartment 81 is guided to second, in running direction of the fiber web, rectangular air compartment 82 as replacement air to optimize energy efficiency.
  • the blow devices 85 on the vertical portions 87, 88 providing support air flows to support the run of the passing fiber web W comprise their own, separate supply air system 96 and advantageously hot air from heat recovery system 97 is mixed to the blowing air.
  • FIG 4 is schematically shown an example of a fiber web production line which comprises a forming section comprising a head box/head boxes 10 and a forming unit 20.
  • the production line further comprises a press section 25, a drying section 30, a sizing section 35, a calender 40, coating sections 45, 50, a final calender 75, a reel-up 55 and a slitter-winder 60.
  • a three-ply fiber web is produced, in which the fiber web comprises a top layer, a middle layer and a bottom layer.
  • the middle layer is the bulkiest layer.
  • the head box 10 is a three-layer head box, shown in the figure 4 , or the production line may comprise three separate head-boxes - one for each layer of the fiber web.
  • the three-layer headbox 10 comprises headers 101, 102, 103 from which the pulp suspensions for each layer of a multiply fiber web are fed to manifold tubes, to an equalization chamber and further via a turbulence generator to slice channels ending to a slice opening of the headbox 10.
  • the forming unit 20 comprises advantageously at least one sleeve roll 201.
  • a sleeve roll is a roll that comprises a stationary support shaft, an belt loop, which is led to circle around the stationary support shaft, that the sleeve roll further comprises at least one curvilinear dewatering zone consisting of two partial curves such that the radius of curvature of a first partial curve is greater than the radius of curvature of a second partial curve following the first partial curve in the travel direction of belt loop.
  • a sleeve roll configuration is disclosed for example in EP patent application 17164069 of the applicant.
  • the press section 25 comprises at least one press nip N25, in the example of the figure 4 there are four press nips N25and it can be configured in various, as such known for one skilled in the art known ways.
  • the drying section 30 comprises for example drying cylinder groups R30 with drying cylinders 301 and drying wires 302 and it can be configured in various, as such known for one skilled in the art known ways.
  • the sizing section 35 comprises a hard nip sizer 351 and drying equipment 352.
  • the calender 40 is advantageously a metal belt calender comprising a metal belt 401 and a calender roll 402, between of which the fiber web is calendered.
  • the coating sections 45, 47, 50 comprise coaters 451, 471, 501 for applying coating onto the multi-ply fiber web and dryers 80 following the coaters 451, 471, 501. After the first coater 451 one dryer 80 located above the machine level is provided.
  • the coating sections 45, 50 advantageously comprise at least curtain coating device 471, advantageously for applying a barrier coating onto the multi-ply fiber web.
  • Each coater 451, 471, 501 in the coating sections 45, 47, 50 is advantageously a curtain coater or a blade coater.
  • the reel-up 55 is advantageously a linear reel-up i.e. configured such that the parent roll 551 forming the reeling nip with the reeling cylinder 552 during reeling is supported on horizontal guides 553 and at substantially same vertical height throughout the reeling.
  • the slitter-winder 60 comprises an unwinding station 601, a slitting section 602 and a winding section 603.
  • the winding section 603 is advantageously a two-drum winder 604, 605, in which a belt arrangement i.e. a so-called set of belt rolls with belt loop or belt loops 608 located around two guide rolls 606, 607 is used as one of the two winding drums 605.
  • the production line may also comprise one or more combined pulpers 70 i.e.
  • one pulper 70 is used for more than one sections of the production line.
  • one combined pulper 70 is used for the drying section 30 and the sizing section 40 and another combined pulper 70 is used for the final calender 75 and the reel-up 50.
EP20213721.2A 2020-01-09 2020-12-14 Dryer for drying coated fiber webs Active EP3848503B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20205016A FI128857B (fi) 2020-01-09 2020-01-09 Kuivain päällystettyjen kuiturainojen kuivaamiseksi ja valmistuslinja päällystettyjen monikerroskuiturainojen valmistamiseksi

Publications (2)

Publication Number Publication Date
EP3848503A1 EP3848503A1 (en) 2021-07-14
EP3848503B1 true EP3848503B1 (en) 2022-08-31

Family

ID=73835387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20213721.2A Active EP3848503B1 (en) 2020-01-09 2020-12-14 Dryer for drying coated fiber webs

Country Status (3)

Country Link
EP (1) EP3848503B1 (fi)
CN (1) CN113106771B (fi)
FI (1) FI128857B (fi)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI108871B (fi) * 1998-07-06 2002-04-15 Metso Paper Inc Menetelmä ja laite päällystetyn rainan kuivattamiseksi
FI118811B (fi) * 2000-11-06 2008-03-31 Metso Paper Inc Päällepuhalluskuivatusyksikkö ja kuivatusosa
DE102010003322A1 (de) * 2010-03-26 2011-09-29 Voith Patent Gmbh Verfahren und Vorrichtung zum Auftragen wenigstens einer Schicht eines Auftragsmediums auf die Oberfläche einer laufenden Papier-, Karton- oder anderen Faserstoffbahn
EP3231937B1 (en) * 2016-04-11 2022-08-31 Valmet Technologies Oy Production line for producing fiber webs and a cooler
EP3382094B1 (en) * 2017-03-31 2023-09-06 Valmet Technologies Oy Forming section for a multi-ply fiber web and a method for forming a multi-ply fiber web
DE202018101573U1 (de) * 2018-03-21 2018-03-28 Valmet Technologies, Inc. Vorrichtung zum berührungslosen Umlenken und Trocknen einer Faserbahn

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Publication number Publication date
CN113106771B (zh) 2023-06-27
CN113106771A (zh) 2021-07-13
EP3848503A1 (en) 2021-07-14
FI20205016A1 (fi) 2021-01-29
FI128857B (fi) 2021-01-29

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