US3868780A - Group of drying cylinders in a multiple cylinder dryer for a material web, in particular for paper - Google Patents

Group of drying cylinders in a multiple cylinder dryer for a material web, in particular for paper Download PDF

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Publication number
US3868780A
US3868780A US412463A US41246373A US3868780A US 3868780 A US3868780 A US 3868780A US 412463 A US412463 A US 412463A US 41246373 A US41246373 A US 41246373A US 3868780 A US3868780 A US 3868780A
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United States
Prior art keywords
drying
web
cylinders
cylinder
felt
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Expired - Lifetime
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US412463A
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English (en)
Inventor
Mauri Soininen
Martti Koponen
Vesa Holopainen
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Valmet Technologies Oy
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Valmet Oy
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8508103&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US3868780(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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Publication of US3868780A publication Critical patent/US3868780A/en
Assigned to VALMET-DOMINION INC., A COMPANY OF CANADA reassignment VALMET-DOMINION INC., A COMPANY OF CANADA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VALMET OY
Anticipated expiration legal-status Critical
Assigned to VALMET PAPER MACHINERY, INC. reassignment VALMET PAPER MACHINERY, INC. CONFIRMATORY ASSIGNMENT Assignors: VALMET-MONTREAL, INC.
Assigned to VALMET PAPER MACHINERY, INC. reassignment VALMET PAPER MACHINERY, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 09/10/1991 Assignors: VALMET-MONTREAL, INC.
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/16—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning perforated in combination with hot air blowing or suction devices, e.g. sieve drum 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
    • D21F5/02—Drying on cylinders
    • 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
    • F26B13/06—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path
    • F26B13/08—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement with movement in a sinuous or zig-zag path using rollers

Definitions

  • the in vention is particularly, characterized in that by the aid of guiding rollers or equivalent the drying felt or wire, together with the web, has been guided to travel from one drying cylinder to the next cylinder in the same group so that the drying cylinders all lie outside the drying felt or wire loop, thus causing the web to travel between the surface of the drying cylinder and the drying felt or wire in every instance.
  • the drying cylinders may be disposed in one or several rows, preferably substantially parallel, the web being conducted from the last cylinder in one row to the next drying cylinder row.
  • Various preferable placements of the guiding rollers with reference to the drying cylinders are specified.
  • the space formed within the felt or wire loop is enclosed by means of side walls and a vacuum is maintained in this space, in which case it is advantageous to make the guiding rollers foraminous, whereby they are able to operate as traverse flow dryers, and possibly to provide them with blowing hoods, which may contain a heat source.
  • the present invention concerns a group of drying cylinders in a multiple cylinder dryer for a web, in particular for paper, having a drying felt or wire which is common for all drying cylinders.
  • the cylinders in the dryer which dry the web are frequently'placed in two rows one above the other, and the web travels along a zigzag path alternately under the lower cylinders and over the upper cylinders.
  • the cylinders are usually grouped to form a few drive groups, the peripheral velocities of each cylinder being constant within one such group. It is common practice to provide in each drive group both for the upper cylinders and for the lower cylinders a felt or wire loop of their own, which loops urge the web against the surface of the cylinders. It is thus understood that the web has to travel from one cylinder row to the other completely without support.
  • the drive group comprises two felt or wire loops, outside which the drying cylinders are located and which, both separately, urge the web in the direction of travel of the web against every second cylinder, that is, the lower felt or wire urges it against the lower cylinders and the upper felt or wire urges it against the upper cylinders.
  • a so-called drying pocket is formed adjacent to each cylinder, which is a space open only at its ends and confined by the bare cylinder surface, by the drying felt or wire passing around the adjacent roller and by the web arriving at and departing from the cylinder. It is a rather difficult task to ventilate this space, and as a result of deficient ventilation the drying process is often non-uniform and the ultimate product has an objectionable moisture content profile.
  • auxiliary equipment for ventilating the pockets of the dryer is frequently mounted within the pockets themselves in machines having drying felts, or on their outside when drying wires are employed. Such equipment is invariably impractical to a certain extent and even tends to cause additional breaks or other kinds of trouble, nor is its use successful in all instances, because it is difficult to correct major moisture content errors.
  • any given set (group) ofdrying cylinders in the multiple cylinder dryer according to said patent has only one single felt loop, with one of the two cylinder rows within this loop and the other cylinder row remaining outside this loop. The web will then travel from one cylinder row to the other under guidance by the felt.
  • the aim of the present invention is to eliminate in multiple cylinder web dryers the above-drawbacks, which have been encountered in them.
  • the invention is characterized in that, with the aid of guiding rollers or equivalent, the drying felt or wire together with the web has been guided to travel from one drying cylinder to the next drying cylinder in the drying cylinder group in such manner that the drying cylinders will lie outside the drying felt or wire loop, in order that the web to be dried might always be compelled to travel between the surface of the drying cylinder and the drying felt or wire.
  • the drying cylinder group may comprise two substantially parallel rows of drying cylinders, the web being directed from the last cylinder in the row which is first inthe direction of travel of the web to the second drying cylinder row.
  • the guiding rollers belonging to the drying cylinder group may be placed between each two adjacent drying cylinders in the rows. It is advantageous if the guiding rollers are so disposed between the drying cylinders in the rows that the planes passing through their axes lie outside the planes passing through the axes of the drying cylinders, and most appropriately so that the planes passing through the axes of the guiding rollers lie outside the tangential planes of the drying cylinders.
  • the open sides of the felt or wire loop have been closed with walls in order to produce an enclosed space within the felt or wire loop and if in said enclosed space a vacuum has been arranged to prevail in order that the web, while travelling upon the drying felt or wire, will be attached to it by suction.
  • Said guiding rollers are most appropriately foraminous so that the vacuum within the drying felt or wire loop causes the web to be attached by suction to the drying felt or wire passing over the guiding rollers.
  • a vacuum of such height may be arranged to act that the guiding rollers may operate as traverse flow dryers. It is then advantageous if the guiding rollers have been provided with a blow hood containing a heat source.
  • the drying cylinder group may also comprise a drying cylinder intended for the drying of the drying felt and which may be located inside or outside the felt loop.
  • FIG. 1 presents as a'longitudinal sectional view a cylinder group of a multiple cylinder dryer according to the invention.
  • FIG. 2 shows, in longitudinal section, a cylinder group of a multiple cylinder dryer according to another embodiment of the invention.
  • FIG. 3 shows, as a longitudinal section, a cylinder group of a multiple cylinder dryer according to a third embodiment of the invention.
  • FIG. 4 shows the section along line IV-IV in FIG. 3.
  • FIGS. 5, 6, 7, 8 and 9 present examples of the longitudinal sections of multiple cylinder dryers according to the present invention.
  • FIG. 1 represents the invention in its simplest form.
  • the reference numerals I, 2, 3, 4, 5 and 6 indicate dryingcylinders disposed in two rows. The drawing has been so executed that l, 2 and 3 are lower cylinders and 4, 5 and 6 are upper cylinders, but in actual fact the positioning of the rows with regard to gravity may be arbitrary and the rows might therefore equally be vertical. It should be noted that the drying cylinders need not even necessarily lie in rows.
  • the numerals 7 refer to drying felt (or wire) guiding rollers belonging to the group, 8. indicates the drying felt (or wire), 9 its tensioning means, 10 a conveyor which conveys the web 11 from the wet end from the press section, or from the preceding group, to the group under consideration.
  • the web 11 is transferred from the conveyor 10 onto the drying felt (or wire) 8 with fully closed conduction without even a single moment at which it would not receive support from one or the other conveyor.
  • the group comprises only one drying felt (or wire) 8 and that the drying cylinders l, 2, 3, 4, 5 and 6 of the group all are located outside the felt (or wire) loop. It is thus understood that the web 11 is supported by the drying felt (or wire) throughout its travel within the group and that at all drying cylinders it is interposed between the drying felt (or wire) and the cylinder surface, whereby an efficient drying action is ensured at all cylinders.
  • the web is in contact with all cylinders with one and the same side.
  • the dryer may be constructed to have a pluralitiy of groups in succession, the side of the web changing at transition from one group to another. Examples of various possible arrangements are seen in FIGS. 5-8. It
  • blowing tubes 13 adjustable in the breadth direction of the web, or blowing hoods 14, may be constructed in association with some of the guiding rollers 7 or perhaps with all of them.
  • FIG. 2 presents a variation developed from the preceding one. Equivalent parts have been indentified by,
  • FIG. 2 shows schematically a suction tube 15 departing from the space 12 and a blower 16, by the aid of which said vacuum is generated.
  • This vacuum now causes the web to be drawn by suction to adhere both to the felt (or wire) 8 at the runs 8 and to the surface of the foraminous guiding rollers 7, which enables fully automatic threading of the leading web end to be accomplished and ensures the travel of the web during operation, which is necessary particularly in the case of high machine speeds, in which instance otherwise the centrifugal force on the-surface of the guiding rollers 7 may be disturbing.
  • doctors 17 have been shown, which during the web introduction operation also ensure the travel of the web 11 together with the felt (or wire) 8.
  • FIG. 3 shows a still more advanced modification of the preceding embodiment. Equivalent parts have been indicated by the same reference numerals. The difference is that now the partitions on either side of the felt (or wire) loop 8 are sturdy enough and the seals have been well enough constructed to enable in the space 12 with the aid of the flower 16 a vacuum of such magnitude to be maintained that a traverse flow through the web 11 is produced. In that case at least partof the guiding rollers 7 may be replaced by traverse flow drying cylinders 18, in themselves known in prior art, with blowing ho'ods 19, 19''.
  • the drying air or gas flows from the hoods in the direction of arrows a through the web and the mantle of the drying cylinder, and the spent gases flow in the direction of arrows b into the space 12 and thence into the suction pipe 15.
  • either individual hoods 19' or a common hood 19" may be provided.
  • dotted lines indicate the positions of the hoods 19, 19" during a web break, giving access to those parts of the mchine where waste may accumulate.
  • the dryer now described has a favourable specific evaporation, because the specific evaportion of each drying cylinder 1, 2, 3, 4, 5 and 6 increases owing to the lowered total pressure in the space 12 and the specific evaporation of the transverse flow dryers 18 can be made a multiple of that of a common cylinder.
  • the ventilation and heat recovery equipment for the machines described differ completely from conventional design solutions. It may be observed, among other things, that since the described dryer may be constructed with impermeable side walls and since at the evaporating surfaces of the web 11 facing towards the room there is a flow directed into the space 12, as a result of the suction effect, it follows that a drying hood proper, in particular a closed one, is unnecessary.
  • FIG. 4 shows the sec-tion through a cylinder group according to FIG. 3 along the line IV-IV. Equivalent parts have been indicated by the same reference nu merals.
  • this figure also shows the walls 20 enclosing the space 12 and which have apertures for the mantles of the drying cylinders 1, 2, 3, 4, 5 and 6 and of the traverse flow dryer cylinders 18 and covers 21 and 22 closing these apertures, in which covers the shafts 23 and 24 of the cylinders are carried.
  • the dryer is provided, in particular, with drying felts, in each group of consecutive drying cylinders, which according to the present invention have one common drying felt, one or several such cylinders may be incorporated for the purpose of drying the drying felt, which are not lapped by the web.
  • FIG. 5 shows a dryer according to the invention having two cylinder groups A and B each with its own drying felt 8.
  • group A the drying cylinders are disposed in two vertical rows, which are side by side, and the number of drying cylinders is five.
  • Group B has four drying cylinders, which lie in two rows, one above the other.
  • the groups have their own drying felts 8.
  • the direction of travel of the web 11 is indicated by arrows C.
  • Each cylinder group has one drying cylinder 25,26 for the drying felt 8.
  • the drying felt (8) drying cylinder 25 in group A lies outside the felt loop
  • the drying cylinder 26 for the drying felt 8 in group B is within the felt loop.
  • FIG. 6 also shows a multiple cylinder dryer according 6 that the drying cylinders lie outside the drying felt loops.
  • the arrow C indicates the direction of travel of the web 11.
  • Each drying cylinder group A and B has six drying cylinders, which lie in two rows, one above the other.
  • the dried web 11 is conducted through a calender 27 to the reeling device 28.
  • FIG. 7 also shows a multiple cylinder dryer according to the invention. It, too, has two drying cylinder groups A and B, similarly as the multiple cylinder dryer of FIG. 6.
  • the multiple cylinder dryer of FIG. 7 differs from that of FIG. 6 mainly only in that both drying cylinder groups A and B have six drying cylinders each, which are disposed in two vertical rows side by side, and that the guiding rollers are traverse flow drying rollers 18 provided with a hood 19, 19".
  • the web II travels in the direction of the arrow C and. upon having dried, goes through the calender 27 to the reeling device 28.
  • FIG. 8 shows a multiple cylinder dryer similar to that of FIG. 7, and equivalent parts have been indicated by the same reference numerals.
  • the multiple cylinder dryer depicted in this figure differs from that of FIG. 7 mainly in that in the groups the drying cylinders in two rows side by side are interjacent. It follows that both groups have six traverse flow dryers 18 with hood 19, 19'', serving as guiding rollers. The conduction of the wire 11 from one cylinder group to the other is also different from the conduction of the web 11 shown in FIG. 7.
  • FIG. 9 shows a multiple cylinder dryer according to the invention having in an oblique position, consecutively, a plurality of drying cylinder groups A, B, C, D, E, F and G. Each one of these comprises one row of drying cylinders, each such row having its own drying felt 8 and the drying cylinders lying outside the felt loop formed by it.
  • the felt loop is guided by guiding rollers 7.
  • the web 11 is conducted from one group to another, supported by the drying wire or felt.
  • a drying cylinder group comprising in combination a plurality of heatable drying cylinders arranged to be rotatable about their horizontal axis.
  • guiding means which together with said guiding rolls direct the drying belt to travel so that all drying cylinders of the group lie outside the loop formed by the endless belt and said guiding rolls lie inside said loop,
  • the entire combination being so arranged that the drying belt together with the web travels, with mutual contact between the two, the whole distance from one drying cylinder to the next drying cylinder group.
  • Drying cylinder group according to claim 1 characterizedin that the drying cylinders are disposed in at least one row, and that the drying belt (8) and the web are guided to travel from one end to the other of the row of drying cylinders from one drying cylinder to the adjacent cylinder in the row.
  • Drying cylinder group according to claim 2 characterized in that the group comprises two, substantially parallel, rows of drying cylinders, the web being conducted from the last drying cylinder in the row which is first in the direction of travel of the web to the second drying cylinder row.
  • Drying cylinder group according to claim 2 characterized in that said guiding rollers are disposed interjacent between two adjacent drying cylinders in the I'OW.
  • Drying cylinder group according to claim 3 characterized in that the guiding rollers are disposed to be interjacent with the drying cylinders disposed in a row, so that the planes passing through their axes lie outside the planes passing through the axes of the drying cylinders placed in a row.
  • Drying cylinder group according to claim 3 characterized in that said guiding rollers lie so far outside the planes passing through the axes of the drying cylinders that the planes passing through the axes of the guiding rollers will lie outside the tangential planes of the drying cylinders.
  • Drying cylinder group according to claim 2 having only one row of drying cylinders, characterized in that the web has been conducted from one drying cylinder group to the next, supported by the drying belt of the first-mentioned drying cylinder group.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
US412463A 1972-11-13 1973-11-02 Group of drying cylinders in a multiple cylinder dryer for a material web, in particular for paper Expired - Lifetime US3868780A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI3174/72A FI53333C (fi) 1972-11-13 1972-11-13 Torkningscylindergrupp i en flercylindertork foer en materialbana i synnerhet foer papper

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US3868780A true US3868780A (en) 1975-03-04

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US (1) US3868780A (enrdf_load_stackoverflow)
CA (1) CA1015154A (enrdf_load_stackoverflow)
DE (1) DE2355397A1 (enrdf_load_stackoverflow)
FI (1) FI53333C (enrdf_load_stackoverflow)
GB (1) GB1426067A (enrdf_load_stackoverflow)
IT (1) IT1001739B (enrdf_load_stackoverflow)
PL (1) PL91256B1 (enrdf_load_stackoverflow)
SU (1) SU712044A3 (enrdf_load_stackoverflow)

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JPH02235411A (ja) * 1989-03-08 1990-09-18 Matsushita Electric Ind Co Ltd 電圧制御発振器
EP0428768A1 (de) * 1989-11-20 1991-05-29 J.M. Voith GmbH Trockenpartie für eine Maschine zur Herstellung von Faserstoffbahnen
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US6402892B1 (en) * 1997-09-18 2002-06-11 Valmet Corporation Drying section of a paper machine with a closed draw to a calender section
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EP1961861A1 (de) 2007-02-21 2008-08-27 Voith Patent GmbH Trocknungsanordnung
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JP2017106704A (ja) * 2015-12-02 2017-06-15 株式会社リコー 乾燥装置、搬送システム

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AT394063B (de) * 1989-11-10 1992-01-27 Andritz Ag Maschf Trocknungsvorrichtung
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Also Published As

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FI53333B (enrdf_load_stackoverflow) 1977-12-30
CA1015154A (en) 1977-08-09
SU712044A3 (ru) 1980-01-25
IT1001739B (it) 1976-04-30
FI53333C (fi) 1978-04-10
DE2355397A1 (de) 1974-06-12
PL91256B1 (enrdf_load_stackoverflow) 1977-02-28
GB1426067A (en) 1976-02-25

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