US3748225A - Fibrous web press nip structure including nonporous belts backed by pistons supported with fluid pressure - Google Patents

Fibrous web press nip structure including nonporous belts backed by pistons supported with fluid pressure Download PDF

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Publication number
US3748225A
US3748225A US00090921A US3748225DA US3748225A US 3748225 A US3748225 A US 3748225A US 00090921 A US00090921 A US 00090921A US 3748225D A US3748225D A US 3748225DA US 3748225 A US3748225 A US 3748225A
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United States
Prior art keywords
nip
belt
web
force applying
reservoir
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Expired - Lifetime
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US00090921A
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English (en)
Inventor
L Busker
C Francik
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Beloit Corp
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Beloit Corp
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Publication of US3748225A publication Critical patent/US3748225A/en
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    • 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
    • D21F3/0209—Wet presses with extended press nip

Definitions

  • An extended nip press device for removing fluids from a fibrous web and including a pair of endless looped non-porous belts positioned to define a nip of at least 6 inches in length.
  • a porous belt or felt is positioned to pass through the nip and is used as a web carrying device.
  • the pressure exerted in the nip is caused by a piston positioned inside the loop of each of the nonporous belts having a force transmitting surface contacting the nonporous belts substantially across the width and length of the nip.
  • Lubrication lines are provided for each piston so as to lubricate the surface contacting the nonporous belt.
  • Deflection control structure defining a fluid reservoir and positioned to accept one of the pistons in each reservoir is further provided, and includes feed lines for supplying fluid to the reservoir in an amount sufficient to support the piston in the reservoir. Force supplied by the piston on the nonporous belt is balanced by the deflection control structure so as to prevent deflection of the piston.
  • Another object of this invention is to provide an extending nip device which is capable of uniform compacting pressure and will expell fluids from the web being treated without a major capital investment.
  • Yet another object of this invention is to provide a method for compacting webs to remove fluids therefrom in an extended nip while simultaneously extending the nip pressure across the entire width of the web in a uniform manner.
  • the device of the present invention includes a pair of endless looped nonporous belts positioned in a nip defining relationship with each other so that the nip is at least 6 inches in length. Depending upon the optimum speed at which the paper machine is to be operated, these belts are positioned to define a nip which may be 10 or 12 inches or even more in length. By designing the nip length for the maximum rate at which the machine will operate, it is possible to achieve maximum efficiency of water removal at all speeds.
  • At least one porous web carrying belt is positioned to pass through the nip.
  • a felt will carry the web from the forming zone through the extended nip and on to the dryer section.
  • Conventional methods for removing water from the felt or felts at a point remote from the press can be employed to insure a consistent reservoir for the fluid being expressed at the press nip.
  • piston means Positioned inside the loop of each of the nonporous belts are piston means having a force transmitting surface contacting the nonporous belt at a point substantially across the width and length of the nip. It is these piston means which transmit the force to the nonporous belts to give the nip pressure. Force transmitting means are provided which are capable of forcing the piston against the nonporous belt through the force transmitting surface.
  • lubrication means must be provided for each piston means to eliminate buildup of heat and friction as the force transmitting surface is urged against the nonporous belt.
  • lubrication means may include an external source of water or other lubricating fluid which would be transferred to the nonporous belt at a point just prior to contact of the belt with the force transmitting surface, so that an amount of fluid sufficient to form a fluid layer between the surface and the belt would be provided.
  • a preferred means for lubricating the force transmitting surface as it contacts the moving nonporous belt will be described hereinafter.
  • deflection control means for each of the piston means.
  • These deflection control means include means defining a fluid reservoir so that the piston means is accepted or positioned within the reservoir. Means are provided to supply fluid to the reservoir in an amount sufficient to support the piston in the reservoir. Therefore, force supplied by the piston on the nonporous belt is balanced by a uniform force throughout the fluid. Since the deflection control means defining the reservoir is fixed, all of the deflection caused by the force into the nip is taken up by the deflection control means.
  • the piston means since it is essentially floating in a fluid, does not appreciably deflect and uniform pressure across the width of the machine is exerted on the web.
  • the pressure which the piston exerts on the nonporous belt to define the nip pressure may be obtained by a means for transmitting fluid under pressure to the reservoir, whereby the fluid pressure on the piston forces the force transmitting surface of the piston against the nonporous belt.
  • the piston receives a uniform fluid pressure across its entire width and length to transmit uniform pressure to the nip, while the deflection caused by such tremendous total load is taken up by the deflection control meanswithout deflecting the piston means.
  • FIG. 1 represents a schematic view showing one embodiment of the present invention.
  • FIG. 2 represents a detailed view of a preferred part of the present invention.
  • a web 12 is carried by a porous belt or felt it) through a nip shown generally in FIG. 1.
  • a pair of looped nonporous belts l4 and 22 are positioned about support rolls and 23 respectively to define a nip such that the nip length is at least 6 inches.
  • the distance between the rolls 15 is substantially greater than the above mentioned 6 inches, the portion of the nip which passes over the forced transmitting surface hereinafter described is considered to be that portion of the nip in which nip pressure is applied. Accordingly, for the purposes of this disclosure, the nip length and width is considered to be defined by the force transmitting surface of the piston means which is in contact with the nonporous belts.
  • a force transmitting means 16 Within the loop of the nonporous belt 14, is a force transmitting means 16. Fluid pressure is supplied to the force transmitting means 16 through line 18 from pump 19 and supply reservoir (not shown) leading from line 20. The force transmitting means is supported on a beam 17. Likewise, within the loop of nonporous belt 22 is a force transmitting means 24 which receives a fluid under pressure through line 26, pump 27 and line 28 to cause nip pressure in the nip. This force transmitting means 24 is supported by frame 25.
  • the force transmitting means is generally shown by the numeral 24 and mounted on beam 25.
  • a force applying means in the form of a piston 33 is positioned to contact the belt 22 substantially across the width and length of the nip.
  • This piston 33 contacts the moving belt 22 at surfaces 35.
  • the surfaces 35 which seal the edges of a chamber 34a in the piston include a surface at the oncoming or leading edge of the chamber 34a, a surface shown at 35a at the trailing edge of the chamber, and surfaces at each side of the chamber with all surfaces slidably engaging the belt. These surfaces surround the opening of the chamber 3411 which is exposed to the belt so that the pressure within the chamber is transmittedthrough the flexible belt to the web carried between the belts.
  • the force transmitting means 16 has the same construction as the force transmitting means 24 so that the chamber and its opening of the force transmitting means 16 are positioned exactly opposite the chamber 34a, and the sliding surfaces for the opposing chamber are directly opposite the sliding surfaces 35.
  • the piston 33 is contained in a reservoir 31 which is defined by a deflection control means 30. Fluid through line 26 is supplied to the reservoir 31 in an amount sufficient to support the piston 33. As shown in FIG. 2, fluid under pressure through line 26 enters the reservoir 31 and then passes through a conduit means which may be in the form of a line or holes 34 in the piston 33.
  • Seal means 32 insure no leakage of the fluid from the reservoir 31. As the fluid passes through holes 34 in piston 33, under substantial pressure, the fluid is forced against the nonporous looped belt 22 to create nip pressure. Optionally, a separate source of fluid could be provided for passage through line 34 to contact the belt 22 and create nip pressure.
  • Sufficient fluid is passed through the holes 34 in piston 33 to cause an escape of fluid along both surfaces 35 and 35A. If, for purposes of example, the belt 22is seen to be moving from left to right as seen inthe drawing, fluid will be carried by the belt 22 across surface 35A to lubricate the surface. However, since the fluid being passed through holes 34 of piston 33 is of sufficient pressure to create a significant nip pressure, this fluid will additionally be forced contrary to the direc-' tion of movement of belt 22 to thereby lubricate surface 35.
  • each pressing means is shown as being of the same construction, and each is shown as including a belt and a confined fluid backing chamber, as described above.
  • An extended nip press for removing water from a traveling fibrous web comprising:
  • first and second looped nonporous flexible belts positioned in a nip defining relationship with each other; guide means within the belts guiding the travel of the belts to form said nip; a first stationary force applying means defining a pressure chamber with an opening exposed to the inner surface of the first belt at said nip, said force applying means having sealing surfaces surrounding said opening at the leading and trailing edges of the opening and at each side thereof sealingly engaging said belt, a second stationary force applying means defining a pressure chamber with an opening exposed to the inner surface of the second belt at said nip, said second force applying means having sealing surfaces surrounding said opening at the leading and trailing edges thereof and at each side thereof sealingly engaging said belt and positioned opposite the sealing surfaces of the first force applying means so that the fluid forces in said chambers will oppose each other and apply opposite balanced pressures along said nip, means supporting each of said force applying means;
  • An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 1:
  • said means supporting each of said force applying means includes deflection control means including a fluid pressure backing chamber means for the force applying means extending laterally of the direction of belt travel across the force applying means and applying a fluid pressure backing thereto at uniform force across the force applying means so that substantial bending of the force applying means is prevented.
  • An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 2:
  • said force applying means is in the form of a piston
  • the deflection control means is in the form of a reservoir with the piston slidably mounted in the reservoir, with means to pressurize the reservoir to provide said fluid pressure backing to the piston.
  • An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 3:
  • conduit means are provided communicating between said reservoir and said chamber for each of said first and second force applying means.
  • An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 3.
  • said means for delivering pressurized fluid to the chambers is connected to said reservoir and said chambers are supplied by conduit means communicating between said reservoir and said chamber of each of said stationary force applying means.
  • An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 1:
  • An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 11 wherein said water receiving means comprises a looped traveling belt passing through the nip between said belts with the web.
  • An extended nip press for removing water from a traveling fibrous web comprising:
  • first and second web pressing means on each side of the web forming a nipsupporting and pressing water from a web carried therebetween,
  • At least one of said pressing means including: a
  • a stationary force applying means defining a pressure chamber with an opening exposed to the inner surface of the belt at said nip
  • said force applying means having sealing surfaces surrounding said opening at the leading and trailing edges of the opening end at each side thereof sealingly engaging said belt
  • deflection control means including a fluid pressure backing chamber means for the force applying the web to receive water pressed from the web. means extending laterally of the direction of belt and water receiving means for through the nip with UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OF CORRECTION PATENT N0. 3 7 5 DATED July 2 1973

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US00090921A 1970-11-19 1970-11-19 Fibrous web press nip structure including nonporous belts backed by pistons supported with fluid pressure Expired - Lifetime US3748225A (en)

Applications Claiming Priority (1)

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US9092170A 1970-11-19 1970-11-19

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US3748225A true US3748225A (en) 1973-07-24

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Country Status (14)

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US (1) US3748225A (de)
JP (1) JPS5026645B1 (de)
AU (1) AU455686B2 (de)
BE (1) BE775339A (de)
BR (1) BR7107683D0 (de)
CA (1) CA947554A (de)
CH (1) CH557450A (de)
DE (1) DE2155547C3 (de)
FR (1) FR2114946A5 (de)
GB (1) GB1370472A (de)
IT (1) IT941738B (de)
NL (1) NL7115871A (de)
SE (1) SE388220B (de)
ZA (1) ZA717150B (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808092A (en) * 1972-03-01 1974-04-30 Beloit Corp Extended fibrous web press nip structure with contoured leading and trailing sills
US3839147A (en) * 1973-03-22 1974-10-01 Beloit Corp Fibrous web press nip structure including nonporous belts backed by fluid pressure chambers having flexible sills
US3853698A (en) * 1972-04-17 1974-12-10 Beloit Corp Large roll hydraulic press with pressurized fluid supports
DE2448794A1 (de) * 1973-10-30 1975-05-07 Noordelijke Ind Voor Vezelverw Pressvorrichtung
US3970515A (en) * 1973-11-05 1976-07-20 Beloit Corporation Controlled sequence pressure nip
US3974026A (en) * 1973-03-01 1976-08-10 Escher Wyss G.M.B.H. Belt press with rotatable cylinder and adjustable pressure member
US4029456A (en) * 1974-10-31 1977-06-14 Eduard Kusters Maschinenfabrik Rapid load-relieve device for continuous press
DE2935630A1 (de) * 1978-09-05 1980-03-20 Beloit Corp Weiterbildung einer feuchtpresse mit erweiterten pressflaechen
US4331073A (en) * 1979-09-20 1982-05-25 Firma Theodor Hymmen Kg. Pressure application apparatus
EP0064933A1 (de) * 1981-04-30 1982-11-17 Beloit Corporation Presse mit verlängerter Presszone
US4365548A (en) * 1979-09-20 1982-12-28 Firma Theodor Hymmen Kg Pressure application apparatus
US4384516A (en) * 1980-03-14 1983-05-24 Werner Pankoke Apparatus for applying surface pressure to advancing workpieces
DE3336462A1 (de) * 1982-10-14 1984-04-19 Valmet Oy, 00130 Helsinki Vorrichtung mit langer presszone zur pressbehandlung einer faserstoffbahn
DE3424599A1 (de) * 1984-07-04 1986-01-09 Fa. Theodor Hymmen, 4800 Bielefeld Vorrichtung zum aufbringen einer flaechenpressung auf fortschreitende werkstuecke
US4665819A (en) * 1984-05-10 1987-05-19 Firma Theodor Hymmen Device for applying surface pressure to an advancing workpiece
US4861430A (en) * 1985-12-09 1989-08-29 Nordiskafilt Ab Controlling a paper web path in the press section with an impermeable belt
US5043046A (en) * 1989-03-22 1991-08-27 Valmet Paper Machinery Inc. Extended nip-press
US5592874A (en) * 1993-09-14 1997-01-14 Pcd Polymere Gesellschaft M.B.H. Double belt press with hydrostatic belt support

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2937410A1 (de) * 1979-09-15 1981-04-02 Into Solymar Benalmadena Costa Malaga Kerttula Kontinuierlich arbeitende plattenpresse
AT385681B (de) * 1986-08-18 1988-05-10 Andritz Ag Maschf Druckeinrichtung fuer maschinen bzw. damit versehene maschine zum entwaessern bzw. filtrieren bzw. fuer pressgut
AT386544B (de) * 1986-08-18 1988-09-12 Andritz Ag Maschf Maschine zum pressen und entwaessern bzw. filtrieren
DE3705241A1 (de) * 1986-12-24 1988-07-07 Escher Wyss Gmbh Verfahren zur mechanisch-thermischen entwaesserung einer faserstoffbahn

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539542A (en) * 1921-11-15 1925-05-26 Irving Hollander Method and apparatus for producing fibrous board
BE525788A (de) * 1954-01-15 1956-06-22
US2928464A (en) * 1957-01-01 1960-03-15 Albert E Reed And Company Ltd Adjustable slice for flow box
US3215065A (en) * 1962-11-23 1965-11-02 Weyerhaeuser Co Continuously operating press apparatus
US3269893A (en) * 1963-12-17 1966-08-30 Black Clawson Co Machine for making extensible paper
US3293121A (en) * 1963-10-09 1966-12-20 Black Clawson Co Pneumatically pressurized paper wet press assembly
US3454463A (en) * 1966-07-12 1969-07-08 Clupak Inc Methods of making newsprint paper
US3556939A (en) * 1966-09-09 1971-01-19 Karlstad Mekaniska Ab Press apparatus for dewatering a fiber web
US3562106A (en) * 1970-02-02 1971-02-09 Beloit Corp Apparatus for maintaining the slice opening in a papermaking headbox
US3586602A (en) * 1966-10-19 1971-06-22 Adolf Schmidt Apparatus for the transverse stretching and transverse shrinking of a continuous web material
US3620158A (en) * 1968-07-12 1971-11-16 Sandvikens Jernverks Ab Continuous press

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1539542A (en) * 1921-11-15 1925-05-26 Irving Hollander Method and apparatus for producing fibrous board
BE525788A (de) * 1954-01-15 1956-06-22
US2928464A (en) * 1957-01-01 1960-03-15 Albert E Reed And Company Ltd Adjustable slice for flow box
US3215065A (en) * 1962-11-23 1965-11-02 Weyerhaeuser Co Continuously operating press apparatus
US3293121A (en) * 1963-10-09 1966-12-20 Black Clawson Co Pneumatically pressurized paper wet press assembly
US3269893A (en) * 1963-12-17 1966-08-30 Black Clawson Co Machine for making extensible paper
US3454463A (en) * 1966-07-12 1969-07-08 Clupak Inc Methods of making newsprint paper
US3556939A (en) * 1966-09-09 1971-01-19 Karlstad Mekaniska Ab Press apparatus for dewatering a fiber web
US3586602A (en) * 1966-10-19 1971-06-22 Adolf Schmidt Apparatus for the transverse stretching and transverse shrinking of a continuous web material
US3620158A (en) * 1968-07-12 1971-11-16 Sandvikens Jernverks Ab Continuous press
US3562106A (en) * 1970-02-02 1971-02-09 Beloit Corp Apparatus for maintaining the slice opening in a papermaking headbox

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3808092A (en) * 1972-03-01 1974-04-30 Beloit Corp Extended fibrous web press nip structure with contoured leading and trailing sills
US3853698A (en) * 1972-04-17 1974-12-10 Beloit Corp Large roll hydraulic press with pressurized fluid supports
US3974026A (en) * 1973-03-01 1976-08-10 Escher Wyss G.M.B.H. Belt press with rotatable cylinder and adjustable pressure member
US3839147A (en) * 1973-03-22 1974-10-01 Beloit Corp Fibrous web press nip structure including nonporous belts backed by fluid pressure chambers having flexible sills
DE2448794A1 (de) * 1973-10-30 1975-05-07 Noordelijke Ind Voor Vezelverw Pressvorrichtung
US3970515A (en) * 1973-11-05 1976-07-20 Beloit Corporation Controlled sequence pressure nip
US4029456A (en) * 1974-10-31 1977-06-14 Eduard Kusters Maschinenfabrik Rapid load-relieve device for continuous press
DE2935630A1 (de) * 1978-09-05 1980-03-20 Beloit Corp Weiterbildung einer feuchtpresse mit erweiterten pressflaechen
US4331073A (en) * 1979-09-20 1982-05-25 Firma Theodor Hymmen Kg. Pressure application apparatus
US4365548A (en) * 1979-09-20 1982-12-28 Firma Theodor Hymmen Kg Pressure application apparatus
US4384516A (en) * 1980-03-14 1983-05-24 Werner Pankoke Apparatus for applying surface pressure to advancing workpieces
EP0064933A1 (de) * 1981-04-30 1982-11-17 Beloit Corporation Presse mit verlängerter Presszone
DE3336462A1 (de) * 1982-10-14 1984-04-19 Valmet Oy, 00130 Helsinki Vorrichtung mit langer presszone zur pressbehandlung einer faserstoffbahn
US4665819A (en) * 1984-05-10 1987-05-19 Firma Theodor Hymmen Device for applying surface pressure to an advancing workpiece
DE3424599A1 (de) * 1984-07-04 1986-01-09 Fa. Theodor Hymmen, 4800 Bielefeld Vorrichtung zum aufbringen einer flaechenpressung auf fortschreitende werkstuecke
US4632722A (en) * 1984-07-04 1986-12-30 Theodor Hymmen Arrangement for applying a surface pressure upon movable workpieces
US4861430A (en) * 1985-12-09 1989-08-29 Nordiskafilt Ab Controlling a paper web path in the press section with an impermeable belt
US5043046A (en) * 1989-03-22 1991-08-27 Valmet Paper Machinery Inc. Extended nip-press
US5592874A (en) * 1993-09-14 1997-01-14 Pcd Polymere Gesellschaft M.B.H. Double belt press with hydrostatic belt support

Also Published As

Publication number Publication date
SE388220B (sv) 1976-09-27
DE2155547A1 (de) 1972-05-31
DE2155547B2 (de) 1977-10-20
JPS5026645B1 (de) 1975-09-02
AU455686B2 (en) 1974-11-21
AU3514571A (en) 1973-05-03
IT941738B (it) 1973-03-10
FR2114946A5 (de) 1972-06-30
CH557450A (de) 1974-12-31
ZA717150B (en) 1972-07-26
BE775339A (fr) 1972-03-16
CA947554A (en) 1974-05-21
NL7115871A (de) 1972-05-24
GB1370472A (en) 1974-10-16
BR7107683D0 (pt) 1973-03-13
DE2155547C3 (de) 1978-06-01

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