US3367035A - Drying on air supported belt - Google Patents

Drying on air supported belt Download PDF

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Publication number
US3367035A
US3367035A US553803A US55380366A US3367035A US 3367035 A US3367035 A US 3367035A US 553803 A US553803 A US 553803A US 55380366 A US55380366 A US 55380366A US 3367035 A US3367035 A US 3367035A
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Prior art keywords
belt
web
drying
air
wet
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Expired - Lifetime
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US553803A
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English (en)
Inventor
Tomlinson George Herbert
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Domtar Inc
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Domtar Inc
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Publication date
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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

Definitions

  • the wet paper sheet After dewatering and pressing, is passed to a dryer section where it is dried, generally on drum dryers.
  • a modern machine for producing newsprint will have about 40 to 60 dryers having a diameter of about For certain papers 21 large drum dryer having a diameter of up to is used for the major drying operation.
  • a dryer known as a Yankee dryer
  • the size of Yankee dryer drums are limited by practical engineering considerations and the temperature must be kept reasonably low to prevent the formation of steam pockets between the sheet and the heating surface. This materially reduces the amount of water that can be removed per unit time.
  • the present invention allows the production of machine glazed or dry-creped pa ers without the limitation of dryer size and drying surface temperature imposed by conventional Yankee dryers.
  • the wet paper web is transferred to a continuous belt which may be made of metal, plastic or other suitable material and which is carried on a heated air stream as it passes on convex surfaces, this air forming the bearing on which the belt moves.
  • the belt may make a single loop of either circular or elliptical form or it may undergo a number of reversing loops where the belt and the paper web are alternatively on the bearing side and subjected to the hot air stream.
  • hot air can be blown against the non-bearing side with the partially saturated and cooled air being removed by known means.
  • the temperature of air on both bearing and non-bearing sides can be staged for different zones in order to allow removal of moisture at rates appropriate to its moisture content for each zone not being so great in the early stages that it disrupts the sheet or separates it from the belt.
  • the belt can be driven from a single point by means of a driven suction roll, a nip roll or other appropriate means.
  • the paper sheet may be separated from the belt before completion of drying and the drying completed by carrying the unsupported web over one or more air bearings.
  • dried paper sheets may be produced under conditions where the paper is allowed to shrink during the drying operation rather than under restraint due to contact with a polished surface as described above, thus obtaining qualities that may be desired for certain purposes.
  • the wet web may be transferred to the drying belt prior to the wet pressing operation.
  • the web can be directly couched onto the belt from the forming wire then carried through the presses on the belt and then dried, or partially dried, still in contact with the belt.
  • the hot air used for drying and for supporting the belt may be obtained by means of direct combustion of fuel. This may be suitably obtained from the exhaust of a gas turbine engine with the power output of the engine being used for driving the pumps, etc., required at the wet end, fans for recycle of the partially cooled gas and for driving the forming wire, the dryer belt and the wind-up reel.
  • FIG. 1 illustrates diagrammatically one embodiment of the present invention, in which a belt makes a single loop
  • FIG. 2 illustrates diagrammatically a second embodiment of the invention in which a belt indicates a number of reversing loops
  • FIG. 3 illustrates diagrammatically a third embodiment in which wet web is transferred to a drying belt prior to a wet pressing operation.
  • paper web 10 emerging from the nip between rolls ll, 12, of the press section of a paper-making machine passes around a roll 13 and is transferred on to the surface of a continuous belt 14, which passes through the nip between roll 15 and roll 13 and is carried on a heated air stream indicated diagrammatically by the arrows 16 which emerge from a shaped chamber 17 to Which the heated air is supplied, as at 18.
  • the streams of air 16 form a bearing on which the belt 14 moves.
  • the belt makes a single loop and the paper web is separated from the belt as at 19, in at least a partially dried condition.
  • the rolls 13 and 15 can serve as driving means for the belt 14.
  • the path of the belt 14 is elliptical but other forms of path of the belt are contemplated such as circular.
  • hot air may be blown against the outer side of the belt and the paper web thereon, by means, not shown, and partially saturated and cooled air removed in any conventional manner.
  • a single inlet 18 there may be a plurality of air inlets so that the belt may pass through a plurality of successive zones of difierent temperature whereby the drying temperature, applied to the belt, may progressively be increased as the paper dries, i.e. the temperature may be increased as the sheet dries and is less susceptible to blistering or being disrupted from the belt.
  • the belt would require some cooling in the interval it is free of contact with the paper. Since the belt is thin it is relatively easy to heat and cool as compared with conventional dryers.
  • the path of the belt 14 includes a number of reversing loops 20, 21 22, 23, 24 and passes through the nip between rollers 25, 26, which serve to drive the belt.
  • the belt is carried on heated air streams in the same manner as it is in the embodiment illustrated in FIG. 1.
  • the path of the belt 14 is completed by air bearings 25 and 26 which are constructed in a manner analogous to that illustrated in FIG. 1 and the driving nip between rolls 27 and 28.
  • Paper web 10 is pressed onto the belt 14 at the nip between rolls 27 and 23 and lies on the outer surface of the belt 14 through the loops 20, 22 and 24, but is on the inner surface of the belt through the loops 21 and 23, being separated from the belt at 29 in either fully or partially dried condition. If the web is not fully dried, drying may be completed by carrying paper web unsupported through one or more supported air bearings, not shown. Since in each of the reversing loops 20, 21, 22, 23, 24, the belt is carried on heated air streams, it is convenient to refer to the assemblies which create these loops as bearings 30, 31, 32, 33, 34. Heated air is supplied to the air bearings as at 35, 36, 37, 38, 39 on the air bearings 27 and 40.
  • the belt 14 passes a pick-up roll 41 disposed adjacent fourdrinier wire 42, between press rolls 43, 44 and 45, 46, over air bearings 47, 48, 49, 50, which create a number of reversing loops 51, 52, 53, 54 and returned via two air bearings 55, 56 to complete the loop.
  • wet web is transferred to the belt 14 at the roll 41 prior to a wet pressing operation between press rolls 43, 44, and 45, 46, and then dried or partially dried while passing through the reversing loops 51, 52, 53, 54 and is separated from the belt at 57.
  • Heated air is supplied to the air bearings 47, 48, 49, 50 as at 58, 59, 60, 61 and to the air bearings 55, 56 as at 63, 64.
  • the paths of press felts 65, 66 pass inbetween the press rolls 43, 44, and 45, 46 respectively and may be completedby turning rolls 67, 68, 69, 70, or air bearings may be employed instead.
  • hot air can be blown against the outer side of the belt and the web thereon by means, not shown, whilst passing through the reversing loops 20 to 24 or 51 to 54 respectively, and partially saturated and cooled air removed in any convenient manner by means not shown.
  • the type of finish desired determines the type of belt used. If a non-shrunk sheet is desired, i.e. to produce a sheet with a surface as formed by drying on a Yankee drum, a polished metal belt will be used. If shrinking.
  • a method of drying a web comprising; pressing a wet web against a surface of a traveling belt, adhering said wet web to said surface, passing said belt through at least one loop while supporting said belt on fluid bearings, heating said web to dry same by means of a supporting fluid which supports said belt on said fiuid bearings and removing said web from said belt.
  • An apparatus for drying a web comprising; a flexible endless traveling belt, means to drive said belt, means to apply a Wet web onto said belt, fluid bearing means for guiding and supporting said belt, said fluid bearing means directing heated fluid toward said belt thereby to heat said belt and dry said web and means for conducting said web away from said belt.
  • An apparatus as defined in claim 4 further comprising at least one pair of press rolls through which said belt passes.
  • a method as defined in claim 1 wherein said belt is directed to travel on a tortous path and wherein said supporting fluid is directed toward one side of said belt in one of said fluid bearings and toward the other side of said belt in another of said fluid bearings.

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US553803A 1965-06-03 1966-05-31 Drying on air supported belt Expired - Lifetime US3367035A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23663/65A GB1153681A (en) 1965-06-03 1965-06-03 Improvements in or relating to Paper-Making Machines

Publications (1)

Publication Number Publication Date
US3367035A true US3367035A (en) 1968-02-06

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ID=10199286

Family Applications (1)

Application Number Title Priority Date Filing Date
US553803A Expired - Lifetime US3367035A (en) 1965-06-03 1966-05-31 Drying on air supported belt

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US (1) US3367035A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1153681A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE316075B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512265A (en) * 1966-10-12 1970-05-19 Vepa Ag Process and apparatus for the contac-tfree treatment of materials which can be stressed in a lengthwise direction
US3633284A (en) * 1969-07-07 1972-01-11 Dominion Eng Works Ltd Web drying
US4055340A (en) * 1975-11-28 1977-10-25 Xerox Corporation Assisted pneumatic transport and registration apparatus
US4218125A (en) * 1978-10-20 1980-08-19 Xerox Corporation Pneumatic system for supporting a photoconductive surface
WO1984000984A1 (en) * 1982-09-09 1984-03-15 Leo Capaldo Econo web dryer station
US4551203A (en) * 1984-04-02 1985-11-05 Valmet Oy Method and arrangement for guiding a paper web from the press section to the drying section
DE19605195A1 (de) * 1996-02-13 1997-08-14 Voith Sulzer Papiermasch Gmbh Trockenpartie
US5792318A (en) * 1996-11-18 1998-08-11 Mancini; Ralph Method to stabilize sheet between press section and dryer section of a paper-making machine
US6260287B1 (en) * 1997-08-08 2001-07-17 Peter Walker Wet web stability method and apparatus
EP1085122A3 (de) * 1999-09-15 2002-01-09 Voith Paper Patent GmbH Verfahren und Vorrichtung zum Trocknen einer Materialbahn
US20090083991A1 (en) * 2007-09-28 2009-04-02 Mabe Canada Inc. Clothes dryer bearing gasket support
US20120125554A1 (en) * 2009-05-27 2012-05-24 Metso Paper, Inc. Device for Drying and Treating a Tissue Paper Web

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE423118B (sv) 1978-03-31 1982-04-13 Karlstad Mekaniska Ab Forfarande och anordning for konsolodering och torkning av en fuktig poros bana

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US756600A (en) * 1902-11-18 1904-04-05 James M Dodge Belt conveyer.
US2135763A (en) * 1935-11-13 1938-11-08 Frederick A Nicholson Endless traveling platen fluid pressure press
US2689196A (en) * 1951-04-02 1954-09-14 Joseph S Daniels Web drier
US3065098A (en) * 1960-03-21 1962-11-20 Eastman Kodak Co Method for coating webs
US3140930A (en) * 1961-07-20 1964-07-14 Beloit Iron Works Belt conveyor drier for web material
US3307270A (en) * 1965-10-21 1967-03-07 Lamb Weston Inc Drying apparatus and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US756600A (en) * 1902-11-18 1904-04-05 James M Dodge Belt conveyer.
US2135763A (en) * 1935-11-13 1938-11-08 Frederick A Nicholson Endless traveling platen fluid pressure press
US2689196A (en) * 1951-04-02 1954-09-14 Joseph S Daniels Web drier
US3065098A (en) * 1960-03-21 1962-11-20 Eastman Kodak Co Method for coating webs
US3140930A (en) * 1961-07-20 1964-07-14 Beloit Iron Works Belt conveyor drier for web material
US3307270A (en) * 1965-10-21 1967-03-07 Lamb Weston Inc Drying apparatus and method

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512265A (en) * 1966-10-12 1970-05-19 Vepa Ag Process and apparatus for the contac-tfree treatment of materials which can be stressed in a lengthwise direction
US3633284A (en) * 1969-07-07 1972-01-11 Dominion Eng Works Ltd Web drying
US4055340A (en) * 1975-11-28 1977-10-25 Xerox Corporation Assisted pneumatic transport and registration apparatus
US4218125A (en) * 1978-10-20 1980-08-19 Xerox Corporation Pneumatic system for supporting a photoconductive surface
WO1984000984A1 (en) * 1982-09-09 1984-03-15 Leo Capaldo Econo web dryer station
US4551203A (en) * 1984-04-02 1985-11-05 Valmet Oy Method and arrangement for guiding a paper web from the press section to the drying section
DE19605195A1 (de) * 1996-02-13 1997-08-14 Voith Sulzer Papiermasch Gmbh Trockenpartie
US5792318A (en) * 1996-11-18 1998-08-11 Mancini; Ralph Method to stabilize sheet between press section and dryer section of a paper-making machine
US6260287B1 (en) * 1997-08-08 2001-07-17 Peter Walker Wet web stability method and apparatus
EP1085122A3 (de) * 1999-09-15 2002-01-09 Voith Paper Patent GmbH Verfahren und Vorrichtung zum Trocknen einer Materialbahn
US6482295B1 (en) 1999-09-15 2002-11-19 Voith Sulzer Papiertechnik Patent Gmbh Process and device for drying of a material web
US6916405B2 (en) 1999-09-15 2005-07-12 Voith Sulzer Papiertechnik Patent Gmbh Process and device for drying of a material web
US20090083991A1 (en) * 2007-09-28 2009-04-02 Mabe Canada Inc. Clothes dryer bearing gasket support
US8028439B2 (en) * 2007-09-28 2011-10-04 Mabe Canada Inc. Clothes dryer bearing gasket support
US20120125554A1 (en) * 2009-05-27 2012-05-24 Metso Paper, Inc. Device for Drying and Treating a Tissue Paper Web
US8486229B2 (en) * 2009-05-27 2013-07-16 Metso Paper, Inc. Device for drying and treating a tissue paper web

Also Published As

Publication number Publication date
GB1153681A (en) 1969-05-29
SE316075B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-10-13

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