EP0055206A1 - Section de presse pour le pressage essentiellement uniforme des deux côtés d'une bande de papier - Google Patents

Section de presse pour le pressage essentiellement uniforme des deux côtés d'une bande de papier Download PDF

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Publication number
EP0055206A1
EP0055206A1 EP81630083A EP81630083A EP0055206A1 EP 0055206 A1 EP0055206 A1 EP 0055206A1 EP 81630083 A EP81630083 A EP 81630083A EP 81630083 A EP81630083 A EP 81630083A EP 0055206 A1 EP0055206 A1 EP 0055206A1
Authority
EP
European Patent Office
Prior art keywords
web
roll
nip
dewatering
press
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
EP81630083A
Other languages
German (de)
English (en)
Other versions
EP0055206B1 (fr
Inventor
Donald Alexander Ely
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 Corp
Original Assignee
Beloit Corp
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 Corp filed Critical Beloit Corp
Publication of EP0055206A1 publication Critical patent/EP0055206A1/fr
Application granted granted Critical
Publication of EP0055206B1 publication Critical patent/EP0055206B1/fr
Expired 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • 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

Definitions

  • This invention relates to the art of pressing and dewatering freshly felted paper sheet web, and is more particularly concerned with attaining substantially equal ink, size or coating receptivity or absorption on both faces of a paper sheet resulting from such a web.
  • Prior press sections have suffered from several deficiencies among which may be enumerated undue complexity, excessively long press sections, unequal pressing and felting of the opposite faces of the web, open draws in the press section and requirement for large operating energy expenditure.
  • An important object of the present invention is to overcome the disadvantages, drawbacks, inefficiencies, short-comings and problems inherent in prior press sections and their operation, and to provide a new and improved press section and method which will attain substantially equal ink, size or coating receptivity or absorption , i.e. compaction, on both faces of a paper sheet resulting from a freshly felted paper sheet web, in a simplified manner, in compact space, tree from open draws in the press section, conserves operating energy, and provides for equal pressing and felting of both faces of the sheet.
  • first press roll means providing a double action dewatering nip through which the web passes in engagement between corunning porous dewatering felts, so that both faces of the web are substantially equally pressed and dewatered in such nip
  • second press roll means comprising a four roll stack providing first, second and third nips through which the web runs successively; a first dewatering felt running in engagement with one face of the web through the first nip, and the opposite face of the web being in direct press roll engagement in this nip; both faces of the web being in direct engagement with press rolls in the second nip; and a second dewatering felt running in engagement with the opposite face of the web in the third nip and said one face of the web being in direct press roll engagement in this nip; so that the web leaves the press section as a paper sheet having both faces substantially equally pressed and dewatered in such nip
  • second press roll means comprising a four roll stack providing first, second and third nips through which the web runs
  • the invention also provides a method of effecting, in a paper making machine dewatering press section, substantially equal pressing and dewatering of both faces of a freshly felted paper sheet web, comprising passing the web in engagement between corunning porous dewatering felts through a double action dewatering nip and in such nip substantially equally pressing and dewatering both faces of the web, and then running the web successively through first, second and third nips in a second press roll means.
  • a first dewatering felt is run in engagement with one face of the web and direct press roll engagement effected of the opposite face of the web in this nip.
  • Direct engagement of both faces of the web is effected in press rolls in the second nip.
  • a second dewatering felt is run in engagement with the opposite face of the web in the third nip, while said one face of the web is run in direct press roll engagement in the third nip.
  • a paper making machine dewatering press section 5 in accordance with the present invention includes a pickoff device 7 adapted to be located adjacently downstream from paper web forming means and operating to lift a freshly formed, i.e. felted, paper sheet web W from a forming belt, wire or fabric 8 for further processing in the press section.
  • the pickoff device 7 comprises a pickoff roll 9 equipped with a suction gland 10 and running in engagement with the upper face of an endless belt dewatering felt 11 which is pressed against the web W on the forming fabric 8 at the nip of the roll 9 with the fabric. Suction from the gland 10 causes the web W to separate from the generally upwardly facing forming fabric 8 and adhere to the generally downwardly facing surface of the dewatering felt 11 which carries the web onward to a first press roll means 12.
  • the dewatering felt Ll runs together with an endless upwardly facing second porous dewatering felt with the web W engaged therebetween through a first pressing and dewatering nip N-1 provided by and between a suction roll 14 and a grooved roll 15.
  • the suction roll 14 is on the lower side of the nip N-l and the grooved roll 15 on the upper side of the nip N-l , so that although in the nip itself substantially equal dewatering results through both faces of the web W, the suction provided by a suction device 17 in the roll 14 effects separation of the web W from the upper felt 11 so that the web W can travel onwardly in machine direction carried on top of the lower felt 13.
  • the upper press roll 15 may embody a structure substantially according to U.S. Patent 3 198 697, that is the perimeter of the roll is provided with a set of axially spaced annular grooves 18.
  • second press roll means 19 comprising a four roll stack providing a second nip N-2, a third nip N-3 and a fourth nip N-4 , through which the web runs successively .
  • the nip N-2 is provided by an upper porous covered press roll 20 and a lower grooved roll 21.
  • the dewatering felt 13 engages the grooved roll 21 and the lower face of the web W
  • the porous covered roll 20 engages the other or upper face of the web.
  • the grooved roll 21 is similar to the grooved roll 15, having an axially spaced set of circumferential annular grooves 22 (Fig. 2).
  • the grooves 22 avoid any tendency toward vacuum retention of the web W on the felt 13, so that the web easily releases from the web 13 at the exit from the nip N-2 for travel on the perimeter of the roll 20 to the nip N-3.
  • the press roll 20 has a porous elastomer cover 23.
  • the cover 23 may be about 1" thick and formed from a suitable elastomer in a 5 to 30 P &J hardness range, which enables the pressing perimeter of the roll 20 to yield slightly under web pressing nipping pressure to minimize crushing the paper web fibers.
  • the degree of hardness of the cover 23 can at least to some extent be determined by the degree of porosity of the cover, that is the size and number of porosity voids 24 in the material of the cover. As noted in Fig.
  • some of the pores 24 open outwardly at the nipping perimeter of the roll 20 and facilitate operation of the roll 20 by capturing water pressed from the web W and thus facilitating release of the web from the roll 20 after the web passes through the nip N-3.
  • a doctor 25 acts on the free offrunning perimeter of the roll 22 beyond the nip N-3.
  • a felt wick 27 may engage the perimeter of the roll 20 either before or after the doctor 25, but preferably after, for applying a web release agent supplied from supply means 28 with which the wick communicates.
  • a suitable spray device may be used, if preferred. It will be appreciated, of course, that the pressing perimeter porosity of the cover 23 should be of a character to avoid marring the surface of the web W in contact with the roll at the nips N2 and N3.
  • the roll 29 may have a plastic cover, it should be of bone hardness and which according to paper machine standards is equivalent to O P &J hardness. Since the nipping perimeter of the roll 29 is smooth, the softer porous perimeter of the roll 20 will easily release the web W from the perimeter of the roll 20 to follow the perimeter of the roll 29 on the offrunning side of the nip N-3. Such release may, of course, be further facilitated by treating the surface of the roll 20 with a release agent as by means of the wick 27.
  • the roll 29 may be driven rotatably by suitable drive means 30 and cause driving of the other rolls in the stack in the press means 19.
  • the web W is engaged on its lower face directly by the perimeter of the roll 29, and on its upper face by a third endless belt dewatering felt 31 which runs through the nip N-4 with the web W and in engagement with the perimeter of a grooved press roll 32 of substantially the same type as the .press rolls 15 and 21, and having a set of axially spaced annular peripheral grooves 33 (Figs. 1 and 4).
  • the web now substantially dewatered and densified leaves the roll 29 and the felt 31 and travels on, as for example, past a guide roller 34 as a sheet W/S which is possessed of substantially equal ink, size or coating receptivity or absorption characteristics.
  • a doctor blade 35 on the perimeter of the roll 29 adjacent to the offrunning side of the nip N-4 will effect separation of the advancing leading end, which can then be directed about the guide roller 34 and onward to a calender, winder, or the like.
  • the doctor 35 is adapted to maintain the perimeter of the roll substantially clean.
  • the substantially equal surface characteristics of the paper sheet W/S leaving the press section 5 results from the substantially equal dewatering and pressing treatment applied to each of the web faces in progressing through the press section.
  • dewatering is effected through both of the web faces, that is, water is caused to leave through both of the faces and thus fines in the web migrate substantially equally from the core of the web toward each face.
  • nip N-2 dewatering is effected through the lower face of the web W as indicated by the directional arrow in Fig. 2, while the upper face is compacted by the perimeter of the roll 20.
  • the web W On traveling through the nip N-3 , the web W is substantially equally compacted by the direct nipping engagement of the rolls 20 and 29 with the opposite faces, as exemplified in Fig. 3 by the double headed arrow.
  • each face of the web has substantially equal concentration of fines so that the desirable equal receptivity or absorption characteristics are attained.

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  • Paper (AREA)
EP81630083A 1980-12-18 1981-12-18 Section de presse pour le pressage essentiellement uniforme des deux côtés d'une bande de papier Expired EP0055206B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US21765780A 1980-12-18 1980-12-18
US217657 1980-12-18

Publications (2)

Publication Number Publication Date
EP0055206A1 true EP0055206A1 (fr) 1982-06-30
EP0055206B1 EP0055206B1 (fr) 1985-08-07

Family

ID=22811969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81630083A Expired EP0055206B1 (fr) 1980-12-18 1981-12-18 Section de presse pour le pressage essentiellement uniforme des deux côtés d'une bande de papier

Country Status (8)

Country Link
EP (1) EP0055206B1 (fr)
JP (1) JPS5922838B2 (fr)
KR (1) KR850001609B1 (fr)
BR (1) BR8108279A (fr)
DE (1) DE3171746D1 (fr)
ES (1) ES8302824A1 (fr)
FI (1) FI79731C (fr)
IN (1) IN154483B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415457A1 (de) * 1983-05-06 1984-11-15 Valmet Oy, Helsinki Geschlossene pressenpartie einer papiermaschine
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
US5670023A (en) * 1993-05-29 1997-09-23 Voith Sulzer Papiermaschinen Gmbh Press of a paper machine for thin papers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE273783C (fr) *
GB697774A (en) * 1950-11-16 1953-09-30 Ralph Chalinor Heys Improvements in or relating to paper-making machines
US3198693A (en) * 1964-08-21 1965-08-03 Beloit Corp Scavenging means for grooved press rolls
US3268390A (en) * 1965-10-28 1966-08-23 Beloit Corp Grooved roll double-felted press for papermaking
GB1381360A (en) * 1972-12-12 1975-01-22 Valmet Oy Paper machine multi-roll press assemblies
FR2343858A1 (fr) * 1976-03-12 1977-10-07 Neyrpic Bmb Perfectionnement aux sections presses des machines a papier et voiles de fibres
US4188262A (en) * 1972-11-30 1980-02-12 Valmet Method for dewatering paper in a paper machine press section

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE273783C (fr) *
GB697774A (en) * 1950-11-16 1953-09-30 Ralph Chalinor Heys Improvements in or relating to paper-making machines
US3198693A (en) * 1964-08-21 1965-08-03 Beloit Corp Scavenging means for grooved press rolls
US3268390A (en) * 1965-10-28 1966-08-23 Beloit Corp Grooved roll double-felted press for papermaking
US4188262A (en) * 1972-11-30 1980-02-12 Valmet Method for dewatering paper in a paper machine press section
GB1381360A (en) * 1972-12-12 1975-01-22 Valmet Oy Paper machine multi-roll press assemblies
FR2343858A1 (fr) * 1976-03-12 1977-10-07 Neyrpic Bmb Perfectionnement aux sections presses des machines a papier et voiles de fibres

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415457A1 (de) * 1983-05-06 1984-11-15 Valmet Oy, Helsinki Geschlossene pressenpartie einer papiermaschine
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
US5670023A (en) * 1993-05-29 1997-09-23 Voith Sulzer Papiermaschinen Gmbh Press of a paper machine for thin papers
EP0652992B2 (fr) † 1993-05-29 2000-11-02 J.M. Voith GmbH Presse de machine a fabriquer du papier pour papiers fins

Also Published As

Publication number Publication date
EP0055206B1 (fr) 1985-08-07
KR850001609B1 (ko) 1985-10-24
JPS57121695A (en) 1982-07-29
DE3171746D1 (en) 1985-09-12
BR8108279A (pt) 1982-10-05
FI79731C (fi) 1990-02-12
FI813825L (fi) 1982-06-19
IN154483B (fr) 1984-11-03
ES508018A0 (es) 1983-02-01
FI79731B (fi) 1989-10-31
KR830007957A (ko) 1983-11-09
ES8302824A1 (es) 1983-02-01
JPS5922838B2 (ja) 1984-05-29

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