EP0960973A2 - Feutre de séchage - Google Patents

Feutre de séchage Download PDF

Info

Publication number
EP0960973A2
EP0960973A2 EP99630046A EP99630046A EP0960973A2 EP 0960973 A2 EP0960973 A2 EP 0960973A2 EP 99630046 A EP99630046 A EP 99630046A EP 99630046 A EP99630046 A EP 99630046A EP 0960973 A2 EP0960973 A2 EP 0960973A2
Authority
EP
European Patent Office
Prior art keywords
vacuum
dryer
fabric
felt
permeability
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.)
Granted
Application number
EP99630046A
Other languages
German (de)
English (en)
Other versions
EP0960973A3 (fr
EP0960973B1 (fr
Inventor
Jeffrey Henry Pulkowski
Rajendra D. Deshpande
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.)
Beloit Technologies Inc
Original Assignee
Beloit Technologies Inc
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 Beloit Technologies Inc filed Critical Beloit Technologies Inc
Publication of EP0960973A2 publication Critical patent/EP0960973A2/fr
Publication of EP0960973A3 publication Critical patent/EP0960973A3/fr
Application granted granted Critical
Publication of EP0960973B1 publication Critical patent/EP0960973B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts

Definitions

  • the present invention relates to a dryer felt device for supporting a web which extends through a single tier drying section of a paper machine.
  • the present invention relates to a looped felt which extends around a plurality of dryer cylinders of a single tier drying section.
  • a pressed web is transferred to a drying section of a paper machine so that water remaining in the web is driven therefrom by passing the web around a plurality of dryer cylinders disposed in a single tier.
  • U.S. Patent No. 4,934,067 assigned to Beloit Technologies, Inc. disclosed a BelChamp type dryer of the single tier type and envisioned that drying speeds of 10,000 feet per minute could be attainable. Already machine speeds of 8,000 feet per minute are being attained on a single tier pilot machine.
  • the present invention overcomes the aforementioned problem of sheet blowing by the provision of a looped dryer felt having a high permeability.
  • the high permeability tends to permit the vacuum within the vacuum roll to generate a negative pressure on the opposite side of the felt run relative to the web during transit of the web from the dryer to the vacuum roll.
  • the present invention relates to a dryer felt device for supporting a web which extends through a single tier drying section of a paper machine.
  • the device includes a looped felt which has a permeability which is greater than 90 cfm (cubic feet per minute).
  • the present invention includes a dryer felt having a permeability which is greater than 150 cfm and preferably at least 600 cfm.
  • Fig. 1 is a side elevational view partially in section of a drying cylinder and an adjacent vacuum roll showing the web blowing away from the drying fabric.
  • Fig. 2 is a side elevational view similar to that shown in Fig. 1 but with the vacuum roll disposed in close proximity to the adjacent dryer.
  • Fig. 3 is a similar view to that shown in Fig. 2 but includes a dryer fabric which has a high permeability according to the present invention.
  • Fig. 4 is a side elevational view of a first dryer section of a single tier drying section of a paper machine according to the present invention.
  • Fig. 1 is a side elevation view of part of a prior art single tier drying section generally designated 10 having a drying cylinder 12 and an adjacent vacuum roll 14.
  • a dryer fabric or felt 16 extends between the drying cylinder 12 and the vacuum roll 14 and the web W is shown being blow away from the supporting fabric 16 during transit between the drying cylinder 12 and the vacuum roll 14.
  • Fig. 2 is a similar view to that shown in Fig. 1 but it shows the vacuum roll 14 disposed in close proximity relative to the dryer 12.
  • Fig. 3 is a similar view to that shown in Fig. 1 but shows the vacuum roll 14A disposed in closer proximity to the adjacent drying cylinder 12A and a felt having a high permeability according to the present invention.
  • Fig. 4 is a side elevation view of a first dryer section 18 of a drying section of a papermaking machine.
  • a dryer felt device 16A supports a web WA which extends through a single tier drying section 18 of a papermaking machine.
  • the device 16A includes a looped felt 16A having a permeability which is greater than 90 cfm.
  • the permeability of the dryer felt is at least 150 cfm and in a preferred embodiment of the present invention the permeability is at least 600 cfm.
  • the dryer felt 16 has typically had a permeability of less than 90 cfm.
  • the aforementioned low permeability fabrics tend to clog easily and they are difficult to clean.
  • the present invention includes the employment of an open fabric or dryer felt having a permeability of at least 90 cfm and usually greater than 150 cfm. Additionally, trials on a pilot single tier BelChamp type dryer section have shown that an open fabric having a high permeability of 600 cfm can be used without blowing the sheet in the pocket areas.
  • An additional advantage of using a high permeability fabric is that the cost of production thereof may be reduced.
  • the advantages of using a high permeability fabric include improved machine runnability since the fabric stays open and is easy to clean thereby increasing the drying capacity of the drying section.
  • the present invention also envisages use of the aforementioned high permeability fabric which is capable of withstanding high temperatures such as is present in those machines incorporating an air cap for blowing heated air through the aforementioned fabric onto the web disposed between the fabric and the dryer cylinder.
  • the advantage of the aforementioned air cap type drying section is that the length of the dryer section can be reduced thus resulting in capital savings.
  • the dryer capacity is variable which may be important for future multigrade machines.
  • drying on both sides of the sheet using air caps provides better curl control and the potential for eliminating any bottom felted sections.
  • the felt according to the present invention is preferably of the type having an open structure and having a permeability of 600 cfm while being of a lower caliper.
  • the aforementioned fabric according to the present invention may be utilized in a single tier drying section having vacuum rolls which may be of the stationary type or pivoting vacuum rolls.
  • the fabric according to the present invention may be utilized in a single tier drying section having passive vacuum boxes which generate a negative pressure due to their proximity to adjacent vacuum rolls.
  • the web ran well in all pockets at 3,000 feet per minute. Also at 3,500 feet per minute the web ran well in pockets incorporating passive vacuum boxes of the aforementioned type.
  • vacuum boxes 20 and 22 were disposed in the pockets between the second and third dryers 24 and 26 and the third dryer 26 and fourth dryer 28, respectively.
  • the vacuum box 22 in the third pocket had felt seals of a simple design due to the fixed geometry.
  • the center shaft and seals in the second and third vacuum rolls 30 and 32 respectively were rotated counterclockwise 4 inches and 2.5 inches respectively, to provide more vacuum in the box 22.
  • the trial plan included comparing a conventional BelChamp type fabric having a permeability of 90 cfm with an open fabric having a permeability of 600 cfm. The trial included the following criteria.
  • the vacuum in the third pocket box 22 was higher than the second pocket box 20 due to better sealing.
  • the vacuum level in the boxes 20 and 22 had no effect on runnability. Therefore, center shaft and seal rotation are not necessary to obtain more vacuum in the boxes.
  • the change in draw had no significant effect on runnability.
  • the sheet WA ran better than with the closed fabric at 3,000 feet per minute machine speed. Threading with vacuum rolls in an open position that is with a three inch gap between the dryer and the vacuum roll, was as good as threading with vacuum rolls in the closed position that is the .5 inch gap.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP99630046A 1998-05-20 1999-05-07 Section de séchage à étage unique Expired - Lifetime EP0960973B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8238998A 1998-05-20 1998-05-20
US82389 1998-05-20

Publications (3)

Publication Number Publication Date
EP0960973A2 true EP0960973A2 (fr) 1999-12-01
EP0960973A3 EP0960973A3 (fr) 2000-07-05
EP0960973B1 EP0960973B1 (fr) 2007-01-03

Family

ID=22170889

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99630046A Expired - Lifetime EP0960973B1 (fr) 1998-05-20 1999-05-07 Section de séchage à étage unique

Country Status (4)

Country Link
EP (1) EP0960973B1 (fr)
JP (1) JP3236997B2 (fr)
CA (1) CA2270755A1 (fr)
DE (1) DE69934630T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1731666A1 (fr) * 2005-06-08 2006-12-13 Voith Patent GmbH Machine à papier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4934067A (en) 1987-02-13 1990-06-19 Beloit Corporation Apparatus for drying a web

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4579771A (en) * 1984-08-10 1986-04-01 Asten Group, Inc. Laminated spiral mesh papermakers fabric
CA1221614A (fr) * 1984-08-10 1987-05-12 Asten, Inc. Toiles lamifiees a tissage spiral et face lisse pour la fabrication du papier
US5933977A (en) * 1995-09-12 1999-08-10 Beloit Technologies, Inc. Curl control with dryer aircaps
US5709735A (en) * 1995-10-20 1998-01-20 Kimberly-Clark Worldwide, Inc. High stiffness nonwoven filter medium
US5873180A (en) * 1996-09-25 1999-02-23 Beloit Technologies, Inc. Papermaking dryer section with partitioned vacuum box for threading

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4934067A (en) 1987-02-13 1990-06-19 Beloit Corporation Apparatus for drying a web

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1731666A1 (fr) * 2005-06-08 2006-12-13 Voith Patent GmbH Machine à papier

Also Published As

Publication number Publication date
DE69934630T2 (de) 2007-10-04
JP3236997B2 (ja) 2001-12-10
EP0960973A3 (fr) 2000-07-05
EP0960973B1 (fr) 2007-01-03
DE69934630D1 (de) 2007-02-15
CA2270755A1 (fr) 1999-11-20
JPH11350378A (ja) 1999-12-21

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