US3384973A - Ventilating dryers - Google Patents

Ventilating dryers Download PDF

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Publication number
US3384973A
US3384973A US581547A US58154766A US3384973A US 3384973 A US3384973 A US 3384973A US 581547 A US581547 A US 581547A US 58154766 A US58154766 A US 58154766A US 3384973 A US3384973 A US 3384973A
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United States
Prior art keywords
fabric
dryer
air
drying
cylinder
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.)
Expired - Lifetime
Application number
US581547A
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English (en)
Inventor
Johansson Ake
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.)
Svenska Flaktfabriken AB
Original Assignee
Svenska Flaktfabriken AB
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Filing date
Publication date
Application filed by Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
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Publication of US3384973A publication Critical patent/US3384973A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
    • 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

  • a ventilating duct operable to blow air against the outer surface of the fabric at a first position prior to its disengagement from the cylinder and to blow air against the fabric at a second position where the fabric is withdrawn from the cylinder so as to permit the air at that position to flow through the fabric into the pocket formed between the fabric and the web by such withdrawal.
  • the duct leaves a space on the outside of the web at a third position free of air impingement so as to permit discharge of air outwardly through the fabric from the pockets prior to engagement of the fabric with the succeeding cylinder. Ventilating air may also be impinged obliquely against the outer surface of the fabric on the second cylinder at a fourth position beyond the third position to assist the aforesaid discharge outwardly through the fabric.
  • This invention refers to a method and an arrangement for the ventilation of a cylinder drying part wherein a material web is moved upwards and downwards between and around a plurality of heated rotating drying cylinders disposed in two rows, one above the other, and where the material web is pressed into contact with at least two of a row of subsequent drying cylinders by an endless dryer fabric which between the said two cylinders is guided by a guide roll.
  • the invention is primarily intended for us in connection with the drying of paper. For this reason, the description in the fol-lowing will deal with this technique.
  • the paper web is directed along a serpentine path in wrapping relation with heated rotating drying cylinders having a diameter of about 1.5 In.
  • heated rotating drying cylinders having a diameter of about 1.5 In.
  • the web instead, usually is pressed against the cylinder surface by endless sheets of textile so-called dryer felts.
  • each of the said means for blowing drying air against and through the dryer fabrics comprises a duct extending along a drying cylinder and located substantially between the said cylinder and the next following drying cylinder in the same row of drying cylinders said duct being connected to the pressure side of a transport means for air and comprising at least two series of blowing nozzles disposed close to and directed towards the dryer fabric, one of the said series of blowing nozzles being adapted to blow drying air against the dryer fabric immediately befort the said fabric runs off a drying cylinder, the second of the said series of blowing nozzles being adapted to blow drying air against the dryer fabric when th said fabric has run off the same said drying cylinder, but before it has come into contact with the next guide roll.
  • the boundary layer impeding the evaporation from the paper web is removed from the last portion of the cylinder, i.e. from the portion where the boundary layer has grown to its greatest thickness and where at the same time the temperature of the paper has increased so much that the evaporation is intensive, and that ventilating air is supplied to the pocket in the place where the dryer fabric itself pumps air into the pocket, due to its removal from the cylinder surface.
  • the said pump effect can be increased additionally by blowing air through a third series of nozzles, in such a manner, that at the same time air is ejected from the pocket.
  • FIG. 1 and FIG. 2 each shows a fragmentary longitudinal section through a cylinder drying part in a paper machine, the said drying part being provided with 3 arrangements according to two embodiments of the invention, and FIGS. 3A and 3B show a longitudinal section through the arrangement according to FIG. 2.
  • a paper web 1 runs upwards and downwards between and around a plurality of hollow drying cylinders 2 heated from the inside with steam.
  • the said cylinders 2 are mounted rotatably and driven by motors (not shown).
  • two endless dryer fabrics 3, 4 are provided which are highly permeable and woven of synthetic material. Each of these fabrics operates only on the cylinders in one row of cylinders and, therefore, must be turned over guide rolls 5 between the cylinders 2.
  • the dryer fabrics 3, 4 are endless, they also comprise a return part (not shown) which runs below and above the cylinders respectively.
  • the said return part is provided with an arrangement for stretching the dryer fabric, in such a manner, that the required pressing of the paper web 1 against the drying cylinders 2 is obtained.
  • a duct 6 is arranged in such a manner, that it extends across the entire width of the dryer fabric.
  • the duct is supplied with hot air from a fan, and within the duct two hole series 7 and 8 are provided through which air flows against the dryer fabric.
  • the boundary layer is blown away while the fabric still is on the cylinder surface, whereafter large amounts of dry air are supplied right in the zone wherein the fabric pumps air into the pocket.
  • the blowing away of the boundary layer in itself should preferably be carried out by jets directed against the direction of travel of the fabric, but doing so a jet pump effect would be created which counteracts the pump efiect of the fabric. For this reason, it has proved most suitable to avoid the jet pump effect by blowing perpendicularly to the wire whereby the boundary layer, nevertheless, is blown away sufiiciently effectively.
  • a partition wall 10 has been provided in the duct 6a, which walls divide the duct into two chambers 11, t2 whereof the first chamber 11 effects the blowing against the fabric whilst on the cylinder surface, and the second chamber 12 blows against the fabric in the draw between a cylinder 2 and a guide roll 5.
  • a swivel damper 13 as shown in FIG. 3A, the amount of air can be adjusted between the said two chambers.
  • FIG. 3B A modified duct 6/) is shown in which a partition 1% separates the duct into two chambers 11b and 12b, and the amount of air is adjusted by swivel dampers 13a and 13b.
  • FIG. 2 further shows the blowing of air against the fabric in a position 14 obliquely in its direction of travel after the fabric has run onto the next drying cylinder.
  • This blowing results in two effects. Firstly, the boundary layer of the fabric is disturbed in a phase prior to position 7 and, secondly, the jets in position 14 assist in ventilating the pockets 9, because they are directed with the flow direction of the air leaving the pocket, and by jet pump action suck out the same.
  • FIG. 3A shows how the chambers 11, 12 are supplied with air from a fan 15 via a heater 16 and swivel dampers 13, and FIG. 3B shows the supply to chambers 11b and 12b from a fan 15b and a heater 161).
  • a method according to claim 1 including the step of blowing air against the dryer fabric in a fourth position located after the point at which the dryer fabric runs onto the next drying cylinder, said air at the fourth position being given an oblique blow direction directed in the direction of travel of the dryer fabric to provide a jet pump action sticking air away from said third position.
  • apparatus for drying web material comprising an upper tier of heated and rotatably mounted drying cylinders, a lower tier of heated and rotatably mounted drying cylinders, at least one endless dryer fabric adapted to press the web material against at least two sequential drying cylinders in one tier, guide rolls intermediate said two drying cylinders for guiding the fabric away from the first of said cylinders and against the second of said cylinders, and supply means for supplying dry ventilating medium to blow against and through the dryer fabric;
  • said supply means comprises a duct extending along the length of the drying cylinders and located substantially between the said two drying cylinders in the one tier, said duct having at least two series of blow nozzles disposed close to and confronting the dryer fabric, one of said series of blow nozzles being adapted to blow dry medium against the fabric at a first position immediately before the fabric runs off the first drying cylinder to blow away the boundary layer of air carried by the fabric at said position, the second of said series being adapted to blow dry medium against the dryer fabric at
  • Apparatus according to claim 3 including in said duct an internal longitudinal partition wall dividing the duct into two chambers, each extending along the length of the duct, and a swivel damper to proportion the medium supply to said two chambers, the first series of blow nozzles communicating with one of said chambers, and the other series of blow nozzles communicating with the other chamber.
  • Apparatus according to claim 3 including a third series of blow nozzles in said duct positioned to blow medium against the dryer fabric at a fourth position after the point at which the dryer fabric has run onto the subsequent drying cylinder, said blow nozzles being directed obliquely to the dryer fabric in the direction of travel of said fabric when in operation, so as to provide a jet pump action sucking medium away from said third position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US581547A 1966-06-09 1966-09-23 Ventilating dryers Expired - Lifetime US3384973A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE788566 1966-06-09

Publications (1)

Publication Number Publication Date
US3384973A true US3384973A (en) 1968-05-28

Family

ID=20272570

Family Applications (1)

Application Number Title Priority Date Filing Date
US581547A Expired - Lifetime US3384973A (en) 1966-06-09 1966-09-23 Ventilating dryers

Country Status (11)

Country Link
US (1) US3384973A (de)
AT (1) AT291740B (de)
BE (1) BE698119A (de)
CH (1) CH471933A (de)
DE (1) DE1561640A1 (de)
DK (1) DK118326B (de)
ES (1) ES340424A1 (de)
FI (1) FI45363C (de)
GB (1) GB1153387A (de)
NL (1) NL6707433A (de)
NO (1) NO139007C (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733711A (en) * 1971-09-07 1973-05-22 Scapa Dryers Ltd Apparatus for and method of treating a web
US4539762A (en) * 1983-03-01 1985-09-10 Valmet Oy Pocket ventilating apparatus for a multi-cylinder dryer of a paper machine
US4716660A (en) * 1986-04-03 1988-01-05 Hercules Incorporated Unifelt air suction system
WO1990004065A1 (en) * 1988-10-11 1990-04-19 Beloit Corporation A dryer section apparatus
US5074278A (en) * 1989-09-29 1991-12-24 Enerquin Air, Inc. Pocket ventilator
US5557863A (en) * 1995-04-12 1996-09-24 Valmet Corporation Blow device for a dryer section of a paper machine
US5628124A (en) * 1987-02-13 1997-05-13 Beloit Technologies, Inc. Apparatus for drying a web
US6412192B1 (en) 2001-01-30 2002-07-02 Enerquin Air Inc. Device and method for ventilating an offset pocket space in a papermaking machine
US6513263B2 (en) 2000-10-06 2003-02-04 Enerquin Air Inc. Ventilator for offset pocket and method of ventilating the same
US6725569B2 (en) 2001-01-30 2004-04-27 Enerquin Air Inc. Device and method for ventilating an offset pocket space in a papermaking machine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8333330D0 (en) * 1983-12-14 1984-01-18 Spooner Ind Ltd Multi-cylinder drying machines
AU608386B2 (en) * 1987-07-23 1991-03-28 Beloit Corporation A dryer section apparatus
FI82095C (fi) * 1987-09-29 1991-01-10 Valmet Paper Machinery Inc Foerfarande och anordning i cylindertorken av en pappersmaskin.
CN111829315A (zh) * 2020-08-03 2020-10-27 成都瑞克西工业自动化技术有限公司 一种拉链布带的干燥方法
CN114739141B (zh) * 2022-05-10 2022-11-25 江苏一澜智能科技有限公司 一种化纤丝自动烘干装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1199394A (en) * 1915-04-28 1916-09-26 Scott Paper Co Means for drying paper.
US1660640A (en) * 1926-11-11 1928-02-28 Eduard V Asten Paper-making machine
US3320677A (en) * 1965-02-12 1967-05-23 Rice Barton Corp Web drying apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1199394A (en) * 1915-04-28 1916-09-26 Scott Paper Co Means for drying paper.
US1660640A (en) * 1926-11-11 1928-02-28 Eduard V Asten Paper-making machine
US3320677A (en) * 1965-02-12 1967-05-23 Rice Barton Corp Web drying apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733711A (en) * 1971-09-07 1973-05-22 Scapa Dryers Ltd Apparatus for and method of treating a web
US4539762A (en) * 1983-03-01 1985-09-10 Valmet Oy Pocket ventilating apparatus for a multi-cylinder dryer of a paper machine
US4716660A (en) * 1986-04-03 1988-01-05 Hercules Incorporated Unifelt air suction system
US5628124A (en) * 1987-02-13 1997-05-13 Beloit Technologies, Inc. Apparatus for drying a web
US5832625A (en) * 1987-02-13 1998-11-10 Beloit Technologies, Inc. Apparatus for drying a web
WO1990004065A1 (en) * 1988-10-11 1990-04-19 Beloit Corporation A dryer section apparatus
US5074278A (en) * 1989-09-29 1991-12-24 Enerquin Air, Inc. Pocket ventilator
US5557863A (en) * 1995-04-12 1996-09-24 Valmet Corporation Blow device for a dryer section of a paper machine
US6513263B2 (en) 2000-10-06 2003-02-04 Enerquin Air Inc. Ventilator for offset pocket and method of ventilating the same
US6412192B1 (en) 2001-01-30 2002-07-02 Enerquin Air Inc. Device and method for ventilating an offset pocket space in a papermaking machine
US6725569B2 (en) 2001-01-30 2004-04-27 Enerquin Air Inc. Device and method for ventilating an offset pocket space in a papermaking machine

Also Published As

Publication number Publication date
NO139007C (no) 1978-12-20
NL6707433A (de) 1967-12-11
GB1153387A (en) 1969-05-29
ES340424A1 (es) 1968-11-16
NO139007B (no) 1978-09-11
DE1561640A1 (de) 1970-07-23
CH471933A (fr) 1969-04-30
AT291740B (de) 1971-07-26
BE698119A (de) 1967-10-16
FI45363B (de) 1972-01-31
DK118326B (da) 1970-08-03
FI45363C (fi) 1972-05-10

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