EP0478825A1 - Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage - Google Patents

Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage Download PDF

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Publication number
EP0478825A1
EP0478825A1 EP90118927A EP90118927A EP0478825A1 EP 0478825 A1 EP0478825 A1 EP 0478825A1 EP 90118927 A EP90118927 A EP 90118927A EP 90118927 A EP90118927 A EP 90118927A EP 0478825 A1 EP0478825 A1 EP 0478825A1
Authority
EP
European Patent Office
Prior art keywords
felt
web
dryer
heated
dryer roll
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.)
Withdrawn
Application number
EP90118927A
Other languages
German (de)
English (en)
Inventor
Thomas George Gulya
David Ray Turner
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.)
Appleton Mills
Original Assignee
Appleton Mills
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 Appleton Mills filed Critical Appleton Mills
Publication of EP0478825A1 publication Critical patent/EP0478825A1/fr
Withdrawn legal-status Critical Current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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F2/00—Transferring continuous webs from wet ends to press sections
    • 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

Definitions

  • the conventional papermaking machine includes a press section having one or more pairs of cooperating press rolls and the wet paper web is supported on a papermaker's felt as it passes through the nip between the cooperating rolls, thereby extracting water from the web.
  • the paper web is transferred to the dryer section which can consist of a plurality of heated dryer rolls. The paper web passes sequentially around the dryer rolls to remove further moisture from the paper.
  • Sag in the draw between the press section and the dryer section can be minimized by increasing the tension on the paper web, but an increase in tension will correspondingly tend to stretch the paper web and increase the tendency for breakage.
  • a dryer section of a conventional papermaking machine may include about ten to twelve steam heated dryer rolls or cylinders, commonly referred to as cans, and the first or upstream roll in the section, to which the wet paper web is transferred from the press section of the machine, is at a lower temperature than other downstream rolls.
  • the upstream dryer roll will have a surface temperature of approximately 140°F to 150°F, and the surface temperature of the next several downstream rolls will be progressively increased to a value of approximately 280°F to 325°F, and this higher surface temperature will then be maintained throughout the remaining rolls of the series.
  • the invention is directed to a papermaking machine in which the wet paper web is supported by the press section felt as it is transferred from the press section to the dryer section of the machine, thereby preventing sagging and possible breakage of the web.
  • the press section includes a pair of cooperating press rolls and an endless papermaker's felt supports the paper web as it passes between the press rolls to extract water from the wet web.
  • the papermaking machine also includes a dryer section consisting of a group of heated dryer rolls, and the press section felt travels from the press rolls of the press section and passes around at least one of the dryer rolls, so that the felt acts to support the wet paper web in the span or draw between the press section and the dryer section and insulates the paper web from the dryer roll.
  • the press felt is interposed between the heated dryer roll and the paper web, the paper web is insulated from the heated roll, and as a result the dryer roll can be operated at a substantially higher temperature than normal.
  • the dryer roll can be operated at a substantially higher temperature than normal.
  • the press felt after passing in contact with the heated dryer roll, will retain a portion of the heat through its endless travel so that the felt will be at an elevated temperature as it passes through the nip between the press rolls. Due to the increase in temperature of the felt at the nip, the viscosity of the water in the paper is reduced, thereby increasing the effectiveness of the water extraction at the nip and thus decreasing steam consumption in the dryer section.
  • the drawing is a schematic representation of a portion of a papermaking machine incorporating the invention.
  • the drawing is a schematic representation of a portion of a papermaking machine including a press section 1 and a dryer section 2.
  • Press section 1 includes a pair of cooperating press rolls 3 and 4 and a wet paper web 5 is supported by a papermaker's felt 6 as it passes through the nip between the press rolls 3 and 4.
  • the paper web can be any type of paper, preferably heavier paper, such as liner board, newsprint, writing paper, or the like.
  • the papermaker's felt 6 is endless in configuration and can consist of natural fibers, synthetic fibers, or a combination thereof.
  • the particular construction or composition of the felt is not critical to the invention.
  • Felt 6 is supported in its endless travel by a plurality of idler rolls, indicated by 7a - 7i.
  • the felt 6 passes around a tensioning or stretch roll 8, which is located between the rolls 7f and 7g.
  • Roll 8 operates in a conventional manner to provide the desired tension on the felt 6.
  • Dryer section 2 includes a plurality of conventional heated dryer rolls, three of which are shown in the drawing, and indicated by 9, 10 and 11.
  • the dryer section may include up to ten or more rolls which are steam heated to a temperature in the range of 150°F to 280°F.
  • the temperature of the rolls in the group may be varied, with the highest temperature being located at the downstream end of the dryer section.
  • press section 1 and dryer section 2 there may be a considerable gap or draw between press section 1 and dryer section 2 and this draw can be in the neighborhood of 10 to 15 feet.
  • this draw can be in the neighborhood of 10 to 15 feet.
  • the paper web will be fairly wet and heavy as it leaves the press section, with the result that the paper web has a tendency to sag in the draw between press section 1 and dryer section 2.
  • the paper web from the forming section must be dropped into a disposal site and then re-fed through the press section an dryer section. Refeeding the web may take from one-half to three-quarters of an hour and this down time results in a substantial decrease in the production rate of the papermaking machine.
  • the felt 6 from the press section is passed around at least one of the dryer rolls or cylinders in the dryer section. As illustrated, the felt is passed around dryer roll 9 and thus supports the paper web in the draw between the press rolls 3,4 and the dryer roll 9.
  • the web 5 is located on the outside of felt 6 as it passes around dryer roll 9 and the web then travels around roll 10 and 11.
  • a conventional dryer fabric 12 is mounted for endless travel in the dryer section and as shown, travels around a pair of idler rolls 13.
  • the dryer fabric 12 operates in a conventional manner to support the paper web against the heated dryer rolls to aid in removal of moisture from the web.
  • the first or upstream heated dryer roll in the dryer section may have a smaller diameter than the remaining dryer rolls of the section and, as such, may be referred to as a "baby" roll or can.
  • the press felt 6 is interposed between the heated upstream dryer roll 9 and the paper web 5, thus insulating the paper web from the heated roll.
  • the dryer roll 9 can be operated at a higher temperature than normal, generally in the range of about 240°F to 280°F, as opposed to a conventional system where the upstream dryer roll, such as roll 9, is operated at a temperature of about 140°F to 150°F. This also results in the succeeding downstream dryer rolls, such as 10 and 11, being operated at a higher temperature than conventional.
  • dryer roll 10 which is in direct contact with paper web 5
  • dryer roll 11 can be operated at a temperature of 190°F to 210°F, again well above the temperature utilized in conventional practice.
  • the final elevated temperature of about 280°F is reached at an earlier stage in the dryer section, thus greatly improving the efficiency of the dryer operation, and enabling a lesser number of dryer rolls to be used in the dryer section.
  • the press felt 6 passing over the heated dryer roll 9 will be heated and will retain a good portion of the heat throughout its endless travel, so that the felt returning to the nip between press rolls 3 and 4 will be at a temperature above 120°F and generally at a range of about 140°F to 180°F.
  • This increased temperature will result in a reduction in the viscosity of the water, thus providing a more effective water extraction at the nip. It has been found that for every 18°F increase in temperature at the nip, a 1% increase in water removal is achieved.
  • a paper web is normally at a temperature of about 100°F as it passes through the nip between press rolls 3 and 4. As this temperature is increased to a range of 140°F to 180°F in the invention, an increase in water removal of 2% or more is achieved, thus resulting in a substantial energy saving in the overall operation.
  • the position and number of the idler rolls 7 in the press section is not critical and various paths of travel for the felt are contemplated depending upon the requirements of the papermaking machine.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP90118927A 1989-10-02 1990-10-04 Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage Withdrawn EP0478825A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US41599889A 1989-10-02 1989-10-02

Publications (1)

Publication Number Publication Date
EP0478825A1 true EP0478825A1 (fr) 1992-04-08

Family

ID=23648101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118927A Withdrawn EP0478825A1 (fr) 1989-10-02 1990-10-04 Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage

Country Status (6)

Country Link
EP (1) EP0478825A1 (fr)
JP (1) JPH03206196A (fr)
AU (1) AU633627B2 (fr)
CA (1) CA2026241A1 (fr)
FI (1) FI904699A0 (fr)
NO (1) NO904271L (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5087325A (en) * 1991-03-13 1992-02-11 Beloit Corporation Apparatus for manufacturing a dried web of paper

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443352A (en) * 1944-03-11 1948-06-15 Boloit Iron Works Suction press section for paper machines
US2786398A (en) * 1952-05-01 1957-03-26 Sprague Electric Co Apparatus and process for producing an extremely thin paper web
EP0346659A2 (fr) * 1988-06-13 1989-12-20 Appleton Mills Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4807371A (en) * 1987-02-13 1989-02-28 Beloit Corporation Apparatus for maintaining the edges of a web in conformity with a dryer felt

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443352A (en) * 1944-03-11 1948-06-15 Boloit Iron Works Suction press section for paper machines
US2786398A (en) * 1952-05-01 1957-03-26 Sprague Electric Co Apparatus and process for producing an extremely thin paper web
EP0346659A2 (fr) * 1988-06-13 1989-12-20 Appleton Mills Machine à papier dans laquelle le papier est supporté dans la zone de passage entre les sections de pressage et de séchage

Also Published As

Publication number Publication date
CA2026241A1 (fr) 1991-04-03
NO904271D0 (no) 1990-10-01
AU633627B2 (en) 1993-02-04
FI904699A0 (fi) 1990-09-25
JPH03206196A (ja) 1991-09-09
NO904271L (no) 1991-04-03
AU6362190A (en) 1991-04-11

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