US3434224A - Ventilating apparatus for a paper machine - Google Patents

Ventilating apparatus for a paper machine Download PDF

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Publication number
US3434224A
US3434224A US643726A US3434224DA US3434224A US 3434224 A US3434224 A US 3434224A US 643726 A US643726 A US 643726A US 3434224D A US3434224D A US 3434224DA US 3434224 A US3434224 A US 3434224A
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US
United States
Prior art keywords
air
casing
dryer section
paper machine
machine
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
US643726A
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English (en)
Inventor
Lars Blomgren
Ake Johansson
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
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 Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
Application granted granted Critical
Publication of US3434224A publication Critical patent/US3434224A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines

Definitions

  • a ventilating apparatus for the dryer section of a paper machine including rotatable air ducts on each side of the dryer section, which air ducts are provided with openings to discharge adjustable jets of ventilation air in order to control cross-flow tendencies inside a casing for the dryer section and thereby to prevent uneven drying profile of the paper web being dried.
  • the present invention relates to the apparatus for the ventilation of a paper machine, comprising a casing for the dryer section of the paper machine, which casing includes roof, side walls and end walls, means for the supply of ventilation air to the casing and means for the removal of ventilation air from the casing.
  • the ventilation air is supplied through the basement-floor below the dryer section or immediately below the usual lower drying felts, and removed through a gap or openings along the longitudinal central line of the roof.
  • a cylinder dryer section is never symmetric with respect to the central portion of the paper web, because on one side thereof there are arranged the transmissions for the operation of the drying cylinders and the steam fittings for the heating of the cylinders.
  • Said fittings comprise a great number of hot pipes, which produce thermal forces tending to press up great amounts of air on this side. Under these conditions an air flow across the machine easily can develop.
  • the vertical flow areas on both sides of the machine can have difierent size
  • a more specific object of the invention is to provide means for the supply of ventilation air comprising members located on each side of the dryer section between same and the side walls and distributed along the length of the dryer section, which members can eject directed jets of ventilation air, which by their impulse flow counteract undesirable air flows.
  • FIG. 1 is a cross section through the dryer section in a paper machine provided with a ventilation apparatus according to the invention
  • FIG. 2 is a side view of the air-supplying members as seen from the line 2-2 of FIG. 1;
  • FIG. 3 is a side elevation view of the dryer section as seen from the left of FIG. 1 with a side wall removed and with parts shown in section.
  • the drying section comprises a machine stand 1 and a number of drying cylinders 2, about which the paper web is directed in a zigzag path.
  • the machine stand is supported on so-called supporting strands 3 of concrete.
  • a light-weight frame 4 is mounted carrying the upper portion of the casing.
  • the right-hand portion of the machine stand 1 includes the transmission for the operation of the drying cylinders.
  • To the right of the transmission the steam and condenser tubes 5 for the heating of the drying cylinders are located.
  • the casing comprises a roof 6, a side wall 7 on the machine operators side, a side wall 8 on the driving side of the machine and two end walls (not shown).
  • a number of liftable doors 9 and a number of slidable doors 10 are provided in the side wall 7 on the operators side, and a number of slidable doors 11 are provided in the side wall 8 on the driving side.
  • the casing For removing by ventilation the water vapour, which evaporates from the drying paper web, the casing is supplied with heated ventilation air through a passage 12, which extends along the central line of the machine in the basement floor below the dryer section.
  • the upper wall of the passage, along the length of the dryer section, is provided with a number of slots 13 for distributing the ventilation air supplied through the passage.
  • the overpressure in the passage is small, but the area of the outflow slots is large so that relatively great amounts of air are supplied at a low speed.
  • the roof is provided in its centre with a gap 14 to an overlying collecting passage 15, which is connected to exihaust fans 16.
  • the means for the supply of drying air also comprise circular impulse air ducts 17, 18 located along the side walls 7, 8 between same and the machine stand 1.
  • the ducts 17, 18 are divided into sections, which are rotatable in relation to each other for rendering possible the directing of a slot 19, 20 provided in every section.
  • the impulse air ducts are connected by ducts 2 1, 22 to the pressure side of fans 23, by which hot air is sucked from a heat recovering unit 24.
  • the flow condition desired to be obtained is characterized by the freedom from horizontal cross flows through the dryer section past the paper web.
  • Cross flows can be caused a.o. by the thermally caused air flow about the steam fittings 5 or by disturbances from leakage flows.
  • the flow can be counteracted and neutralized by placing the outflow openings 19, 20 of the impulse air ducts 17, 18 in the positions shown in the figure.
  • the air jets from the right-hand duct 18 thereby bring about an air motion, which neutralizes the tendency for overpressure on the right-hand side of the dryer section, which gave rise to the cross flow.
  • the area of the openings 19, 20 in the impulse air drums can be made adjustable.
  • a ventilating apparatus for the dryer section of a paper machine comprising a casing for said dryer section, including roof, side walls and end walls; means for supplying ventilation air to the casing; and means for exhausting ventilation air from the casing, said air-supplying means including fan means and horizontally extending air ducts loacted on each side of the dryer section between same and the side walls and having a plurality of duct sections along the length of the dryer section, said air duct sections being connected to the pressure side of said fan means, and being provided with openings to discharge jets of ventilation air, said duct sections being rotatable in relation to each other to adjust said jets.

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  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
US643726A 1966-06-14 1967-06-05 Ventilating apparatus for a paper machine Expired - Lifetime US3434224A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE08074/66A SE359874B (xx) 1966-06-14 1966-06-14

Publications (1)

Publication Number Publication Date
US3434224A true US3434224A (en) 1969-03-25

Family

ID=20273081

Family Applications (1)

Application Number Title Priority Date Filing Date
US643726A Expired - Lifetime US3434224A (en) 1966-06-14 1967-06-05 Ventilating apparatus for a paper machine

Country Status (10)

Country Link
US (1) US3434224A (xx)
AT (1) AT278503B (xx)
BE (1) BE699911A (xx)
DE (1) DE1561642C3 (xx)
ES (1) ES341741A1 (xx)
FI (1) FI54162C (xx)
GB (1) GB1152888A (xx)
NL (1) NL6708252A (xx)
NO (1) NO135644C (xx)
SE (1) SE359874B (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4268974A (en) * 1977-04-05 1981-05-26 Greenbank-Cast Basalt Engineering Co. Limited Hoods for the cylinder drying section of paper making machines and other cylinder drying machines
US4524689A (en) * 1982-09-13 1985-06-25 Lemaster Milton R Dehydration apparatus for printing press inking system
US4536970A (en) * 1982-03-18 1985-08-27 Valmet Oy Procedure for boosting the ventilation in the hood of a paper machine
DE4037423A1 (de) * 1990-11-24 1992-05-27 Voith Gmbh J M Trockenpartie
US5666740A (en) * 1995-04-27 1997-09-16 Valmet Corporation Hood for a wire part and for a press section
US6006444A (en) * 1997-03-14 1999-12-28 Andritz-Patentwaltungs-Gesellschaft M.B.H. Process and a device for reducing dust deposits on the drying hood or duct work of a paper machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0515255T3 (da) * 1991-05-22 1998-08-10 Unimetall Sa Fremgangsmåde og indretning til indsugning af gaseller røg i en metallurgisk beholder og elektriskovn forsynet med en sådan
IT1264014B (it) * 1993-04-07 1996-09-06 Nuovo Pignone Spa Meccanismo perfezionato per la trasmissione del comando di selezione della posizione di battuta del pettine in un telaio tessile per spugna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1515431A (en) * 1923-10-30 1924-11-11 Cobb J Forrest Drying kiln
US2000546A (en) * 1931-04-18 1935-05-07 John O Woodsome Paper drying process and apparatus
US2977686A (en) * 1959-02-19 1961-04-04 Jamar Olmen Company Apparatus for the manufacture of paper

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1515431A (en) * 1923-10-30 1924-11-11 Cobb J Forrest Drying kiln
US2000546A (en) * 1931-04-18 1935-05-07 John O Woodsome Paper drying process and apparatus
US2977686A (en) * 1959-02-19 1961-04-04 Jamar Olmen Company Apparatus for the manufacture of paper

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4268974A (en) * 1977-04-05 1981-05-26 Greenbank-Cast Basalt Engineering Co. Limited Hoods for the cylinder drying section of paper making machines and other cylinder drying machines
US4536970A (en) * 1982-03-18 1985-08-27 Valmet Oy Procedure for boosting the ventilation in the hood of a paper machine
US4524689A (en) * 1982-09-13 1985-06-25 Lemaster Milton R Dehydration apparatus for printing press inking system
DE4037423A1 (de) * 1990-11-24 1992-05-27 Voith Gmbh J M Trockenpartie
US5146696A (en) * 1990-11-24 1992-09-15 J. M. Voith Gmbh Drying cylinder axis arrangement for drying section
US5666740A (en) * 1995-04-27 1997-09-16 Valmet Corporation Hood for a wire part and for a press section
US6006444A (en) * 1997-03-14 1999-12-28 Andritz-Patentwaltungs-Gesellschaft M.B.H. Process and a device for reducing dust deposits on the drying hood or duct work of a paper machine

Also Published As

Publication number Publication date
DE1561642B2 (de) 1977-11-03
NO135644C (xx) 1977-05-04
SE359874B (xx) 1973-09-10
ES341741A1 (es) 1968-07-01
BE699911A (xx) 1967-11-18
DE1561642C3 (de) 1978-06-22
NL6708252A (xx) 1967-12-15
AT278503B (de) 1970-02-10
FI54162B (fi) 1978-06-30
FI54162C (fi) 1978-10-10
NO135644B (xx) 1977-01-24
DE1561642A1 (de) 1970-04-02
GB1152888A (en) 1969-05-21

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