US3528883A - Device at presses for dewatering paper and pulp webs - Google Patents

Device at presses for dewatering paper and pulp webs Download PDF

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Publication number
US3528883A
US3528883A US640091A US3528883DA US3528883A US 3528883 A US3528883 A US 3528883A US 640091 A US640091 A US 640091A US 3528883D A US3528883D A US 3528883DA US 3528883 A US3528883 A US 3528883A
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US
United States
Prior art keywords
roller
cloth
small
press
rollers
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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
US640091A
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English (en)
Inventor
Borje Arvid Lundin
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.)
Nordiska Maskinfilt AB
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Nordiska Maskinfilt AB
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Filing date
Publication date
Application filed by Nordiska Maskinfilt AB filed Critical Nordiska Maskinfilt AB
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Publication of US3528883A publication Critical patent/US3528883A/en
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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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices

Definitions

  • the present invention relates to a press for dewatering a humid or a wet fibre web, this press being of the kind having an upper presser roller and a lower driving roller and between them a smaller presser roller and the purpose of the invention is to provide a more even pressure which has been achieved by letting an endless, porous (open) wire of cloth which is difficult to compress, run over the small presser roller and through the press nip between the upper presser roller and the smaller presser roller and under tension about the smaller presser roller, the latter then serving as a pulley for said wire or cloth.
  • the present invention has reference to presses for dewatering wet or humid webs, e.g. a paper web or another fibre web carried by a felt, of the kind comprising two rollers situated one above the other and running in the same directions, viz. one presser roller and one driver roller situated therebelow, said driver roller adapted, via a presser roller of a considerably smaller diameter and situated between and parallel to said two rollers and an endless, porous (open) cloth which is difficult to compress, to transfer a driving moment to the upper presser roller.
  • the small roller is, according to a known embodiment, provided with peripheral circumferentially extending grooves. It is carried on rods only at the ends.
  • the press nip will be short which means that the specific pressure (the surface pressure) will be high for a given line pressure.
  • An essential advantage obtained by the use of such a small presser roller between the two big presser rollers is to be seen therein that the grooves on the roller quickly leave the contact with the felt which results in a very small rewetting of the same.
  • the purpose of the present invention is to eliminate the drawbacks of the above described press type.
  • the main feature of the invention is to be seen therein that the cloth which as has been described in the aforegoing, is difficult to compress runs on the small presser roller through the press nip between the latter and the upper presser roller and is adapted to be moved under tension around the small presser roller which also serves as a 3,528,883 Patented Sept. 15, 1970 pulley for the cloth. Due to this cloth which is arranged in the way described and which may comprise a com monly known Fourdrinier felt, the small roller is kept straight during its operation between the two large rollers. The cloth also ensures that the fibre web be not marked.
  • the hydraulic pressure will also be very low in a wire (cloth) which considerably facilitates the dewatering of the paper web. Due to the small cross section of the small roller any rotable degree of rewetting of the felt is prevented for the reason that the felt immediately after the press nip leaves the cloth about the small roller. The cloth may also transfer considerable drive moments in such a way that only one of the large rollers has to be driven, viz. the lower one.
  • the drawbacks in the known press are eliminated by means of the invention and at the same time the advantages of the same are preserved with regard to a good dewatering and in certain cases the dewatering is further increased.
  • FIGS. 1 and 2 are end views of two different embodiments of the invention.
  • FIG. 3 shows, on an enlarged scale, a completing end elevation of the embodiment shown in FIG. 1, and
  • FIGS. 4 and 5 illustrate two further modifications.
  • the upper roller of the press has been denoted by reference numeral 1, its lower roller, the driving roller has been denoted with reference numeral 2, and the smaller intermediate presser roller by reference numeral 3.
  • a wire or cloth 4 runs over the small roller and encloses the same with an angle of more than 180.
  • the cloth 4 encloses with an angle a, which in the shown embodiment exceeds also the driving roller 2 which is supposed to be driven directly.
  • the cloth 4 runs further over an expansion roller 5, a tension roller 6 and an adjustment roller 7.
  • the cloth further runs past a suction or exhaust box 8 by means of which, water brought along is removed from the cloth.
  • a scraper 9 abuts against the lower roller 2 for removing water from the mantle of this roller.
  • Reference numeral 10 denotes a machine felt passing through the press nip 11 between the upper presser roller 1 and the small presser roller 3, this machine felt carrying a fibre web 12 to be dewatered. After the press nip 11, the fibre Web 12 is guided by a roller 11 away from the felt 10.
  • the water in the fibre web 12 is transmitted via the felt 10 to the cloth 4 from which the water is removed through the box 8.
  • the tension in the cloth 4 maintains the roller 3 straight in spite of the considerable side pressure acting on it by means of the larger rollers 1, 2.
  • FIG. 2 corresponds to the one shown in FIG. 1 with exception of the fact that the small roller 3 according to FIG. 2 has been arranged on the left hand side of the connection line 16 between the longitudinal axes of the two larger rollers 1 and 2.
  • FIG. 3 there is shown a bearing device suitable for the roller 3.
  • the shaft 17 of the small roller 3 is at both ends (only one shown) carried for rotation in a bearing 18 having a transversal sleeve 19 which is displaceable on a rod 20 with one end journalled in a stationary bracket 21.
  • adjustment and locking nuts 22, 23 which can be screwed on the free threaded ends 24 of the rods 21, the shaft 17 can be moved closer to or away from the connection line 16 between the longitudinal axes of the rollers 1 and 2 whereby the pressure in the press nip 11 is increased or reduced, respectively.
  • Reference numerals 14 and 15 denotes screens for collecting sprayed water.
  • the upper presser roller 1 has been replaced by two smaller presser rollers 1', situated one after the other. Between the driving roller 2 and each one of the smaller upper rollers 1' there is journalled a small presser roller 3. There runs over each roller 3 a felt sieve 4 essentially in the way described. The cloths also enclose a considerable part of the driving roller 2. There is between the rollers 3' arranged a suction box 25 for dewatering the felt 10 passing through the press after the first press nip 11'. So as to prevent water, spraying from the press nip 11', to enter the press nip 11" it is advisable to arrange a rubber edging 26 on the under side of the suction box 25.
  • the fibre web 12 may be removed from the felt 10 immediately after the first press nip 11 by being passed over a pulley 27.
  • the felt has, through the suction box 25, lost a great deal of its water contents and the dewatering of the fibre web 12 in the second press nip 11" will for this reason he very good.
  • two felt wire cloths viz. one for enclosing each one of the rollers 3, one may as shown in FIG. be satisfied with one single cloth 4'.
  • This single cloth 4' extends, after being laid about the first roller 3, practically about the whole of the driving roller 2 and runs thereupon over the second roller 3.
  • a number rollers 5, 6 serve for adjustment and tensioning of the cloth 4'.
  • dewater cloth 4 there is used one which is porous and difficult to compress.
  • a common Fourdrenier wire either of metal or synthetic fibres. If last mentioned material is used, there is advisable to use monofilament yarns for the warp.
  • the mesh size of the wire or cloth should not exceed 1 millimeter.
  • the invention embraces also such a press, in which the upper as well as the lower roller 1 and 2., respectively, is positively driven.
  • a press for dewatering a humid or a wet web e.g. a paper web or another fibre web carried by a felt, and of the kind comprising two rollers rotating in the same direction and being situated one above the other, viz a presser roller and a driving roller situated therebelow,
  • said last mentioned roller adapted, via a presser roller situated between the presser roller and the driving roller and extending parallel to these rollers and having a diameter considerably smaller than the diameter of said two rollers, and an endless, porous wire or cloth which is difficult to compress, to transmit a driving moment to the upper presser roller, wherein the improvement comprises the fact that means are provided to run said cloth over the small presser roller throuh the press nip between the same and the upper presser roller and is adapted to run under tension about the small presser roller which serves also as a pulley for the cloth.
  • a press as claimed in claim 1, wherein the cloth is manufactured from metal wires or a synthetic material in the shape of either monofilament or multifilament or both, the mesh size not exceeding 1 millimeter.
  • a press as claimed in claim 1 having a further upper presser roller carried for rotation above the driving roller and being parallel to the same, wherein there is between the driving roller and each one of the two upper presser rollers arranged a small presser roller cooperating with the upper presser rollers in question and serving as a pulley for an endless, porous cloth which is difiicult to compress, and forming with each of their upper presser roller two press nips in their points of contact.

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  • Paper (AREA)
US640091A 1966-06-06 1967-05-22 Device at presses for dewatering paper and pulp webs Expired - Lifetime US3528883A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7722/66A SE314893B (no) 1966-06-06 1966-06-06

Publications (1)

Publication Number Publication Date
US3528883A true US3528883A (en) 1970-09-15

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ID=20272134

Family Applications (1)

Application Number Title Priority Date Filing Date
US640091A Expired - Lifetime US3528883A (en) 1966-06-06 1967-05-22 Device at presses for dewatering paper and pulp webs

Country Status (5)

Country Link
US (1) US3528883A (no)
DE (1) DE1561675A1 (no)
GB (1) GB1194715A (no)
NL (1) NL6707408A (no)
SE (1) SE314893B (no)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973483A (en) * 1973-03-09 1976-08-10 Edward Kusters Apparatus for the continuous pressure treatment of a web
US4555306A (en) * 1983-10-03 1985-11-26 Tamfelt Oy Ab Method and means for removing water from a web in a press of a papermaking machine
US4826571A (en) * 1984-08-03 1989-05-02 Webster David R Roller-type presses including methods associated therewith
US6325895B1 (en) * 2000-06-12 2001-12-04 Voith Sulzer Paper Technology North America, Inc. Paper-making machine with an air press belt run

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19630190A1 (de) * 1996-07-26 1998-01-29 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Konditionierung eines Filzes in einer Papiermaschine
DE19631404A1 (de) * 1996-08-04 1998-02-05 Voith Sulzer Papiermasch Gmbh Pressenpartie
DE19633422A1 (de) * 1996-08-20 1998-02-26 Voith Sulzer Papiermasch Gmbh Pressenpartie und Verfahren zum Entwässern einer wässrigen Faserstoffbahn

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938444A (en) * 1932-06-29 1933-12-05 Rice Barton & Fales Inc Press roll
GB868288A (en) * 1957-12-19 1961-05-17 Lippke Paul Improvements in or relating to the removal of water from fibrous material and wet presses therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938444A (en) * 1932-06-29 1933-12-05 Rice Barton & Fales Inc Press roll
GB868288A (en) * 1957-12-19 1961-05-17 Lippke Paul Improvements in or relating to the removal of water from fibrous material and wet presses therefor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973483A (en) * 1973-03-09 1976-08-10 Edward Kusters Apparatus for the continuous pressure treatment of a web
US4555306A (en) * 1983-10-03 1985-11-26 Tamfelt Oy Ab Method and means for removing water from a web in a press of a papermaking machine
US4826571A (en) * 1984-08-03 1989-05-02 Webster David R Roller-type presses including methods associated therewith
US6325895B1 (en) * 2000-06-12 2001-12-04 Voith Sulzer Paper Technology North America, Inc. Paper-making machine with an air press belt run

Also Published As

Publication number Publication date
NL6707408A (no) 1967-12-07
DE1561675A1 (de) 1970-04-02
GB1194715A (en) 1970-06-10
SE314893B (no) 1969-09-15

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