US3607626A - Double-felted press - Google Patents

Double-felted press Download PDF

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Publication number
US3607626A
US3607626A US856654A US3607626DA US3607626A US 3607626 A US3607626 A US 3607626A US 856654 A US856654 A US 856654A US 3607626D A US3607626D A US 3607626DA US 3607626 A US3607626 A US 3607626A
Authority
US
United States
Prior art keywords
roll
felt
suction
press
web
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
US856654A
Other languages
English (en)
Inventor
Jan Peter Nilsson
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.)
Metso Fiber Karlstad AB
Original Assignee
Karlstad Mekaniska 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 Karlstad Mekaniska Ab filed Critical Karlstad Mekaniska Ab
Application granted granted Critical
Publication of US3607626A publication Critical patent/US3607626A/en
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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses

Definitions

  • One of the rolls is a suction roll, and the suction zone is located entirely on the downstream side of the roll, relative to the direction of rotation of the roll, from the nip, is contiguous or in proximate relation to the nip, and is within the segment of the roll over which the felt for that roll is trained.
  • a guide roll for the felt associated with the other press roll (the nonsection-roll is normally positioned such that the felt is separated from the web being pressed before the web reaches the suction zone of the suction roll but is arranged to be moved to a position training that felt around the suction zone of the suction roll so that thetwo felts turn around the suction zone of the suction roll and ensure that the web runs with the suctionroll felt.
  • the two felts are trained to run together over the suction zone of the suction roll only upon startup of the machine.
  • This invention relates to a double-felted press of the type used in papermaking machines.
  • a roll-type press in which each of two press rolls forming a nip between them runs within a felt loop is usually known as a double-felted press.
  • double-felted presses have been used primarily in papermaking machines that operate at relatively low speeds, generally at speeds not greater than 200 meters per minute.
  • a double-felted press usually provides greater dewatering capacity than a single-felted press inasmuch as, among other reasons, the felts on both sides of the web receive liquid from the web, and the effective distance that the liquid must flow across the thickness 'of the web to a felt is reduced.
  • the web With a papermaking machine that operates at a relatively low speed, say below 200 meters per minute, the web can sometimes be made to follow the drier felt by manually guiding it over to the drier felt upon startup, and thereafter the web will follow the drier felt. On high-speed papermaking machines, however, the web will not remain on the drier felt, even if it may be initially guided onto the drier felt by some means, but will return to the wetter felt in operation. It appears that the ability to operate a machine with the web following the drier felt is restricted to speeds less than 200 meters per minute, though the precise breakover point will vary somewhat depending upon the basis weight of the web and upon the dryness of the felts as they leave the press nip.
  • One expedient for keeping the web on the drier felt at relatively higher speeds is to use a suction roll as one of the two press rolls, the suction roll having a suction zone extending through the nip and somewhat downstream from the end of the nip, the suction roll being the roll associated with the drier felt.
  • the suction in the suction roll holds the web on the drier felt as it leaves the nip, so that the web sill thereafter run with the drier felt.
  • a novel and improved double-felted press that is arranged so that the web will follow a desired one of the two felts, usually the drier felt, with a minimum of rewetting from the other felt, i.e., the wetter felt.
  • the arrangement offers the advantage of ensuring that the web will follow the desired felt, even at relatively high machine speeds.
  • a double felted press comprises a pair of press rolls arranged to form a press nip and an endless press felt associated with each of the rolls, the two press felts, of course, being looped around the respective rolls and passing through the press nip.
  • press felt isused herein in the broader sense of any suitable endless, flexible, permeable web, including fabrics made of various materials, such as-textile fibers, plastic fibers or filaments, or metallic wire.
  • One of the two press rolls is a suction roll in which the suction zone is located, in accordance with the invention, in a position entirely outside of the press nip but in proximate or contiguous relation to the downstream end of the press nip and within the portion of the suction roll over which the press felt associated with it is trained.
  • the suction zone By locating the suction zone entirely outsideof the press nip, the tendency for the suction to rewet the web by sucking liquid from the felt associated with the other roll of the press roll pair is substantially eliminated.
  • the suction zone is located in a position where it is effective to hold the web on the felt associated with the suction roll, which will usually be the felt which, in the particular machine, had the higher dryness of the two felts of the press.
  • the web is guided in a sandwich between the two felts over the suction roll.
  • the felt associated with the nonsuction roll of the roll pair is led from the nip to a roll that can be adjusted from a normal position in which the felt diverges from the felt associated with the suction roll upon leaving the nip and a position in which that felt is trained with the suction roll felt for some distance from the nip, such distance includ ing the suction zone of the suction roll.
  • the operation of tail-threading is accomplished with the two felts running together over the suction zone with the web between them to ensure that the tail of the web follows the felt associated with the suction roll at the outset.
  • the adjustable roll is shifted back to the normal position so that the felt associated with the nonsuction roll of the roll pair diverges from the nip and leaves the web supported or carried on the suction roll felt as the suction roll felt traverses the suction zone.
  • the double-felted press shown in the drawing comprises two endless felts 1 and 3, each of which is arranged to travel in an endless path over guide rolls 5.
  • the drawing illustrates only portions of the two felts, and those skilled in the art will readily understand that the felts travel along an appropriate path provided by additional guide rolls that are not shown in the drawing.
  • Each of thepress felts 1 and 3 will, of course, have cleaning and drying apparatus of any suitable type, also as well known to those skilled in the art, so that the felts return to the press nip in a relatively clean and dry state and capable of adsorbing liquid pressed from the web in the press nip.
  • the felts l and 3 pass together through a nip defined between a pair of press rolls 7 and 9, respectively, the roll 9 being a suction press roll.
  • the fibrous web, designated by the reference numeral 13, to be pressed is led through the nip 11 between the two felts 1 and 3, and is subjected to the squeezing action of a nip pressure exerted by urging the rolls 7 and 9 toward each other in a suitable manner, thereby to express liquid from the web 13.
  • the web 13 is shown as being delivered in an open draw, that is, unsupported by any felt or

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  • Paper (AREA)
US856654A 1968-09-17 1969-09-10 Double-felted press Expired - Lifetime US3607626A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE12491/68A SE324502B (enrdf_load_stackoverflow) 1968-09-17 1968-09-17

Publications (1)

Publication Number Publication Date
US3607626A true US3607626A (en) 1971-09-21

Family

ID=20295829

Family Applications (1)

Application Number Title Priority Date Filing Date
US856654A Expired - Lifetime US3607626A (en) 1968-09-17 1969-09-10 Double-felted press

Country Status (7)

Country Link
US (1) US3607626A (enrdf_load_stackoverflow)
AT (1) AT291737B (enrdf_load_stackoverflow)
DE (1) DE1945454A1 (enrdf_load_stackoverflow)
FI (1) FI44523B (enrdf_load_stackoverflow)
FR (1) FR2018228A1 (enrdf_load_stackoverflow)
GB (1) GB1284119A (enrdf_load_stackoverflow)
SE (1) SE324502B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861997A (en) * 1972-12-21 1975-01-21 Beloit Corp Paper machine press arrangement with stacked press rolls
EP0001072A1 (de) * 1977-09-03 1979-03-21 Bayer Ag Verfahren zum mechanischen Flüssigkeitsentzug aus Flächengebilden, die aus Polymeren bestehen
US4909903A (en) * 1987-03-13 1990-03-20 J. M. Voith Gmbh Wet press nip with nonrotating adjustable belt exit guides
US4915790A (en) * 1987-12-17 1990-04-10 Hans Dahl Press section of a papermaking machine with adjustable felt guide roll
US5951821A (en) * 1996-04-04 1999-09-14 Valmet Corporation Arrangement and method for transferring a web in a paper machine from a two-felt press nip to a dryer section

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5548797B1 (enrdf_load_stackoverflow) * 1971-04-02 1980-12-08
US6261415B1 (en) 1998-08-28 2001-07-17 Valmet Karlstad Ab Paper machine
DE10247538A1 (de) * 2002-10-11 2004-05-06 Voith Paper Patent Gmbh Pressenanordnung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178691B (de) * 1958-07-11 1964-09-24 Doerries A G O Vorrichtung zum UEberfuehren der Papierbahn vom Langsieb einer Papiermaschine in diePressenpartie mittels Pressluft

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178691B (de) * 1958-07-11 1964-09-24 Doerries A G O Vorrichtung zum UEberfuehren der Papierbahn vom Langsieb einer Papiermaschine in diePressenpartie mittels Pressluft

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3861997A (en) * 1972-12-21 1975-01-21 Beloit Corp Paper machine press arrangement with stacked press rolls
EP0001072A1 (de) * 1977-09-03 1979-03-21 Bayer Ag Verfahren zum mechanischen Flüssigkeitsentzug aus Flächengebilden, die aus Polymeren bestehen
US4909903A (en) * 1987-03-13 1990-03-20 J. M. Voith Gmbh Wet press nip with nonrotating adjustable belt exit guides
US4915790A (en) * 1987-12-17 1990-04-10 Hans Dahl Press section of a papermaking machine with adjustable felt guide roll
US5951821A (en) * 1996-04-04 1999-09-14 Valmet Corporation Arrangement and method for transferring a web in a paper machine from a two-felt press nip to a dryer section
US6103066A (en) * 1996-04-04 2000-08-15 Valmet Corporation Methods for transferring a web in a paper machine from a two-felt press nip to a dryer section

Also Published As

Publication number Publication date
FI44523B (enrdf_load_stackoverflow) 1971-08-02
SE324502B (enrdf_load_stackoverflow) 1970-06-01
GB1284119A (en) 1972-08-02
AT291737B (de) 1971-07-26
DE1945454A1 (de) 1970-03-26
FR2018228A1 (enrdf_load_stackoverflow) 1970-05-29

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