US3819474A - Endless sieve belt draining device for paper machines - Google Patents

Endless sieve belt draining device for paper machines Download PDF

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Publication number
US3819474A
US3819474A US00268103A US26810372A US3819474A US 3819474 A US3819474 A US 3819474A US 00268103 A US00268103 A US 00268103A US 26810372 A US26810372 A US 26810372A US 3819474 A US3819474 A US 3819474A
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US
United States
Prior art keywords
sieve
endless
roller
longitudinal
belt
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
US00268103A
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English (en)
Inventor
E Holz
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.)
Finckh Hermann Metalltuch und Maschinenfabrik
Original Assignee
Finckh Hermann Metalltuch und Maschinenfabrik
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
Priority claimed from DE19712132713 external-priority patent/DE2132713C3/de
Application filed by Finckh Hermann Metalltuch und Maschinenfabrik filed Critical Finckh Hermann Metalltuch und Maschinenfabrik
Application granted granted Critical
Publication of US3819474A publication Critical patent/US3819474A/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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/07—Water collectors, e.g. save-alls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/03—Belt alignment

Definitions

  • a draining device for a paper making machine including a longitudinal sieve which carries a slurry of paper material, a rotatable draining roller, at least one further roller, a pair of register rollers disposed with one on each side of the draining roller, and an endless sieve belt.
  • the draining roller has a sieve-type outer surface.
  • the endless sieve belt extends over the draining roller and the further roller and moves over these rollers at the same linear velocity as the longitudinal sieve.
  • the endless sieve draining belt extends approximately parallel to the longitudinal sieve between the register rollers.
  • the present invention relates to a draining device, particularly for a paper making machine which includes a rotating draining roller with a sieve-type outer surface disposed above a longitudinal sieve screen which carries a slurry of paper material and moves over register rollers disposed with one on each side of the draining roller. 7
  • the outer surface of the draining roller is provided in the form of a sieve so that the draining roller acts directly on the slurry of paper material as it passes the roller.
  • the period of its action is relatively short due to the relatively high operating speed of modern paper machines and the necessarily limited diameter of the draining roller.
  • the period of action can be varied only slightly by changing the diameter of the draining roller since there are practical limits to the extent to which the diameter of the draining roller can be increased.
  • the path over which the draining roller acts on the slurry of paper material on the longitudinal sieve is 30 to 50 mm long in the direction of the longitudinal sieve, with a speed of the longitudinal sieve of from 100 to 1,000 m/min.
  • the action time of the draining roller thus lies between 0.03 and 0.003 seconds for a path of action of 50 mm.
  • a speed of 1,000 m/min is not feasible.
  • a draining device composed of an endless sieve belt which passes over the draining roller and at least one further roller and moves with a linear velocity which is equal to that of the longitudinal sieve.
  • the endless sieve belt is partly disposed between the register rollers so that it is approximately parallel to the longitudinal sieve in the region where they cooperate.
  • the diameter of the draining roller becomes almost of no significance and with an appropriate arrangement of the draining roller and the further roller, longpaths of action for the draining device can be obtained.
  • the space requirement for the apparatus of the present invention is no greater than that for the known draining devices.
  • Sieve bands arranged above the longitudinal sieve of a paper making machine are known per se, but are used to produce an entirely different effect, such as to form sheets and not as a draining device. Moreover, these known overhead sieve bands are driven in a direction opposite to the direction of movement of the longitudinal sieve and do not flatly contact the paper.
  • the further roller for the endless sieve belt which is disposed behind, or downstream of, the draining roller, lies directly above, or preferably behind, the second register roller and at a vertical distance above the longitudinal sieve.
  • the endless sieve belt and the longitudinal sieve which extend beyond the area of contact of the longitudinal sieve and the register roller following in the direction of movement of the longitudinal sieve form an angle of no more than 10 therebetween. This disposition is more advisable and offers further advantages for the invention.
  • the further roller which is spaced above the longitudinal sieve, rather than the draining roller is provided with a drive which operates in synchronism with the drive of the longitudinal sieve, the further roller being spaced above the longitudinal sieve.
  • synchronism is meant that the further roller drive is such that the linear velocity of the endless sieve belt is equal to the linear velocity of the longitudinal sieve.
  • Another advantage is realized by providing the further roller of the endless sieve belt in a known manner with helical grooves starting from its center in order to prevent wrinkling of the rotating endless sieve belt.
  • the endless sieve belt can be tensioned longitudinally by adjusting the spacing of the two rollers from one another and/or tensioned transversely because of the engagement of the guide belts in the guide grooves.
  • the apparatus for effecting the distance adjustment can be of a simple construction, for example a setting gear can be provided.
  • Another possibility for effecting the desired tensioning of the endless sieve belt in a structurally simple manner is to provide discs or wheels which are axially displaceable with respect to the draining roller and further roller under the action of springs, hydraulic or pneumatic cylinders or the like, and to provide these discs or wheels with the guide grooves.
  • the endless sieve belt can be tensioned particularly easily if it is a bias cut fabric, preferably a metal wire screen consisting in particular of bronze or stainless steel.
  • a plastic screen can also be used.
  • Draining devices of the type under consideration must be cleaned while in operation. This is effected by means of pipes from which a water jet or steam jet is emitted.
  • the water jet is deflected from the draining body and its removal causes additional problems.
  • care must be taken to collect the water splashed by the draining roller when it is lifted off the slurry of paper.
  • both problems can be solved without difficulty with a single device. It is therefore proposed to provide within the endless sieve belt a collecting trough for the water splashed from the draining roller and to have an upper portion of the col lecting trough designed to catch the water from a cleaning device for the endless sieve belt.
  • FIG. 1 is an elevational cross-sectional view of part of a paper making machine provided with one preferred embodiment of the draining device according to the present invention.
  • FIG. 2 is a simplified view, on a reduced scale similar to that of FIG. 1, showing one embodimentof a tensioning device for tensioning the endless sieve belt.
  • FIG. 3 is a cross-sectional detail view taken along line 3-3 of FIG. 2.
  • FIG. 4 is a plan view of the draining device shown in FIG. 2.
  • FIG. 5 is a simplified view, similar to that of FIG. 2 showing another embodiment of a tensioning device for tensioning the endless sieve belt.
  • FIG. 6 is a cross-sectional detail view taken along line 6-6 of FIG. 5.
  • FIG. 7 is a plan view of the drawing device of FIG. 4.
  • FIG. 8 is a plan view of one embodiment of a driven roller for the endless sieve belt.
  • FIG. 1 shows a longitudinal sieve 10 on which a paper slurry 12 is placed for displacement in the direction A.
  • the longitudinal sieve 10 moves over two register rollers 14 and 16 of which one has a rubber coating 14a and the other has apertures 16a so that it constitutes a sieve roller.
  • the register roller 16 is arranged downstream of the register roller 14 when viewed in direction A.
  • a vacuum box 1612 In the interior of register roller 16 there is a vacuum box 1612 which is connected with a pump (not shown) to maintain a continuous subatmospheric pressure therein.
  • the draining device includes a draining roller 18, a further rubber roller 20 provided with a drive (not shown) and an endless sieve belt 22 which is guided over the two rollers 18 and 20 which thus function as end rollers. End roller 20 is situated downstream of roller 18 when viewed in direction A.
  • the draining roller 18 is provided with a sieve-type outer surface and both rollers 18 and 20 are supported on and reinforced by a tubular shaft 18a and 20a, respectively.
  • FIG. 1 also shows that the draining roller 18 in a preferred embodiment is disposed midway between the two register rollers 14 and 16. Moreover, the distance between the axes of the two rollers 18 and 20 for the endless sieve belt 22 is about twice that of the diameter of the draining roller 18. It has been found that these dimensions produce particularly good results. It should be understood however, that other dimensional relationships are possible within the scope of the present invention.
  • the rubber roller 20 has a rubber coating 20b which is provided, as shown in FIG. 8, with helical grooves 200 starting at its center and extending axially outwardly therefrom in opposite winding directions. These grooves constitute a first means for preventing the formation of wrinkles in the endless sieve belt 22.
  • the deflection H of the longitudinal sieve 10 between the rollers 14 and 16 determines the path of action B of the draining device of the present invention.
  • the path B may be adjusted and made shorter or longer to adopt it to the particular operational requirements by a displacement of the draining roller 18.
  • the path of action B over which the endless sieve belt 22 is practically parallel with the longitudinal sieve 10 is substantially longer than the path of action that would result if only the draining roller 18 were used.
  • the vertical distance of the roller 18 from the sieve 10 is smaller than the vertical distance of the roller 20 from the sieve 10.
  • the endless sieve belt 22 forms an angle a with the longitudinal sieve 10.
  • the angle a is substantially smaller than the exit angle B formed by the tangent to the point of the draining roller 18 leaving the surface of the paper slurry 12 and the surface of the paper slurry.
  • the angle a is preferably no more than
  • the water drained by the sieve belt 22 forms a relatively flat trajectory D, as compared to the parabolic trajectory C, which would be formed by the draining roller 18 in the prior art devices. This constitutes a further advantage of the device of the present invention.
  • An advantage of the device according to the present invention is that the water jet 32' is directly sprayed against the sieve belt 22 from the pipe 32.
  • the collecting trough assembly 34 includes a lower trough portion 34a and an upper trough assembly portion 34b for collecting the water splashed by the draining roller 18 and the pipe 32, respectively.
  • the water splashed from the endless sieve belt 22 when the belt 22 is deflected about the rubber roller 20 is collected in a collecting trough 36.
  • the transverse edges of the endless sieve belt 22 are provided with guide straps 22a along the longitudinal extent of these edges.
  • the straps 22a are of an elastic material.
  • the outer ends of the rollers 18 and 20 are provided with guide grooves within which the straps 22a are held. In this way, the sieve belt 22 is effectively prevented from contracting in a transverse direction which contraction would produce predominantly longitudinal wrinkles in the belt 22 when it is tensioned in a longitudinal direction.
  • a tensioning device in the form of a setting gear assembly is provided in order to longitudinally tension the sieve belt 22. The tensioning device effectively varies the distance between the rollers l8 and 20.
  • the tensioning device includes a set of bearing blocks 54 mounted at each end of the shafts 42 and 44 of the rollers 18 and 20, respectively.
  • the bearing blocks 54 on each side of the rollers 18 and 20 support spindles 46 and 48, respectively and the spindles 46 and 48 have oppositely directed thread sections which engage with threads within the aligned bores of their respective bearing block set.
  • the spindle 48 can be turned by means of a handwheel 48a.
  • Bevel gears 50 are disposed at the ends of each spindle 46 and 48.
  • the gears 50 mesh with bevel gears 52 of a connecting shaft 53.
  • the spacing between the rollers 18 and 20 is effected by rotating the hand wheel 48a in the appropriate direction depending on whether the spacing is to be increased or decreased.
  • the tensioning device shown in FIGS. 2 to 4 is particularly suited for endless sieve belts 22 made of bias cut metal wire screens.
  • FIGS. 5 to 7 The second embodiment of a tensioning device is shown in FIGS. 5 to 7.
  • the guide straps 22a are fastened to the transverse edges of the endless sieve belt 22 along their longitudinal extent.
  • guide grooves 60 are provided in tensioning discs 62 which are mounted on the shafts 42 and 44 of the rollers 18 and 20 and rotate therewith.
  • the sieve belt 22 is tensioned in a transverse direction by means of compression springs 64. This can best be seen by reference to FIG. 6.
  • Elements 64 may also be pneumatic or hydraulic cylinders or the like.
  • the tensioning device shown in FIGS. 5 to 7 is suited for endless sieve belts with a linear transverse seam, for circularly woven endless sieve belts without a seam and for bias cut endless sieve belts of the type shown in FIG.
  • a second end roller being supported above said longitudinal sieve downstream of said second register roller, said second end roller being situated at a second vertical distance from said longitudinal sieve, and being out of contact with said paper slurry, said second vertical distance being greater than said first vertical distance;
  • an endless draining sieve belt trained about said first and second end rollers and being driven with the same linear velocity as said longitudinal sieve, said endless sieve belt having a path of action extending from the location it enters said slurry to a location directly above the highest point of engagement between said second register roller and said longitudinal sieve, said first and second distances being so related to one another that said endless sieve belt extends parallel to said longitudinal sieve along said path of action.
  • said second end roller is provided on its outer surface with helical grooves starting at its center and extending axially outwardly in opposite winding directions from said center.
  • said tensioning means includes guide grooves provided at the axial ends of said first and second end rollers, an elastic guide strap at each transverse end of said sieve belt, each said strap moves in a corresponding guide groove in said first and second end rollers, and setting gear means connected between said first and second end rollers, said endless sieve belt is tensioned by the adjustment of the spacing between said first and second end rollers by said setting gear means and the retention of the distance between said guide straps.
  • said tensioning means includes discs which are provided with guide grooves therein, means for displacing said discs in a direction transverse to the movement of the longitudinal sieve, and an elastic guide strap at each transverse end of said endless sieve belt, each strap moves in a corresponding guide groove in said first and second end rollers, said endless sieve belt is tensioned by the adjustment of said discs by said means for displacing.
  • a device as defined in claim 11, wherein said means for displacing are springs.
  • a device as defined in claim 11, wherein said means for displacing are hydraulic cylinders.
  • a device as defined in claim 11, wherein said means for displacing are pneumatic cylinders.
  • said tensioning means includes discs which are provided with guide grooves therein, means for displacing said discs in a direction transverse to the movement of the longitudinal sieve, an elastic guide strap at each transverse end of said endless sieve belt, each strap moves in a corresponding guide groove in said first and second end rollers, and setting gear means connected between said first and second end rollers, said endless sieve belt is tensioned by the adjustment of said discs by said means for displacing and the adjustment of the spacing between said first and second end rollers by said setting gear means.
  • a device as defined in claim 16, wherein said means for producing said transverse displacement are springs.
  • a device as defined in claim 16, wherein said means for producing said transverse displacement are hydraulic cylinders.
  • a device as defined in claim 16, wherein said means for producing said transverse displacement are pneumatic cylinders.
  • a device as defined in claim 1 further comprising a collecting trough for the water splashed from said first end roller, said trough being provided in the region enclosed by said endless sieve belt.
  • a device as defined in claim 20 further comprising a cleaning device for said endless belt sieve, and wherein said collecting trough is disposed to collect the water from said endless belt sieve cleaning device.

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  • Paper (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Filtration Of Liquid (AREA)
US00268103A 1971-07-01 1972-06-30 Endless sieve belt draining device for paper machines Expired - Lifetime US3819474A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712132713 DE2132713C3 (de) 1971-07-01 Vordruckpresse für die Siebpartie einer Langsiebmaschine

Publications (1)

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US3819474A true US3819474A (en) 1974-06-25

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ID=5812354

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Application Number Title Priority Date Filing Date
US00268103A Expired - Lifetime US3819474A (en) 1971-07-01 1972-06-30 Endless sieve belt draining device for paper machines

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US (1) US3819474A (enExample)
JP (1) JPS5122963B1 (enExample)
AT (1) AT322965B (enExample)
FR (1) FR2141385A5 (enExample)
GB (1) GB1366002A (enExample)
SE (1) SE392490B (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997448A (en) * 1974-06-04 1976-12-14 Gec Diesels Limited Filter arrangements
US4130486A (en) * 1976-02-23 1978-12-19 Pollutex Milieutechniek B.V. Method and device for the separation of a liquid-containing mixture
US4561938A (en) * 1984-02-17 1985-12-31 M/K Plank Corporation Forming roll apparatus
US5338408A (en) * 1993-02-09 1994-08-16 Gilman Paper Company Paper forming unit with two dandy rolls
US20070210015A1 (en) * 2004-04-16 2007-09-13 Kadant Black Clawson Inc. Dual Zone Wireless Pulp Washer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2951183C2 (de) * 1979-12-19 1984-05-10 Andreas Kufferath KG, 5160 Düren Vorrichtung zur Beeinflussung einer vorentwässerten Fasersuspension

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US483329A (en) * 1892-09-27 Suction mechanism for paper-machines
US2141393A (en) * 1935-03-19 1938-12-27 Int Paper Co Apparatus for the manufacture of paper and the like
US2627789A (en) * 1950-04-10 1953-02-10 Campbell John Suction box
US2881678A (en) * 1956-06-12 1959-04-14 St Annes Board Mill Co Ltd Method and apparatus for making paper or paper board or similar fibrous product
US3077990A (en) * 1960-03-07 1963-02-19 Peterson Filters & Eng Filter medium guide
US3116244A (en) * 1960-05-12 1963-12-31 Eimco Corp Belt aligning apparatus
CA690702A (en) * 1964-07-14 R. Sirles Aden Regulating means for filter belts
US3167281A (en) * 1962-06-13 1965-01-26 Cheney Bigelow Wire Works Inc Fourdrinier wire cloth
CA749321A (en) * 1962-04-02 1966-12-27 G. Hose Alfred Filaments and non-woven structure and the method of making the same for paper making machines
US3429447A (en) * 1963-10-11 1969-02-25 Steven S Davis Aligning means for endless web filter
US3445003A (en) * 1966-10-07 1969-05-20 Chicago Bridge & Iron Co Vacuum filter with a ring-tensioned medium

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US483329A (en) * 1892-09-27 Suction mechanism for paper-machines
CA690702A (en) * 1964-07-14 R. Sirles Aden Regulating means for filter belts
US2141393A (en) * 1935-03-19 1938-12-27 Int Paper Co Apparatus for the manufacture of paper and the like
US2627789A (en) * 1950-04-10 1953-02-10 Campbell John Suction box
US2881678A (en) * 1956-06-12 1959-04-14 St Annes Board Mill Co Ltd Method and apparatus for making paper or paper board or similar fibrous product
US3077990A (en) * 1960-03-07 1963-02-19 Peterson Filters & Eng Filter medium guide
US3116244A (en) * 1960-05-12 1963-12-31 Eimco Corp Belt aligning apparatus
CA749321A (en) * 1962-04-02 1966-12-27 G. Hose Alfred Filaments and non-woven structure and the method of making the same for paper making machines
US3167281A (en) * 1962-06-13 1965-01-26 Cheney Bigelow Wire Works Inc Fourdrinier wire cloth
US3429447A (en) * 1963-10-11 1969-02-25 Steven S Davis Aligning means for endless web filter
US3445003A (en) * 1966-10-07 1969-05-20 Chicago Bridge & Iron Co Vacuum filter with a ring-tensioned medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997448A (en) * 1974-06-04 1976-12-14 Gec Diesels Limited Filter arrangements
US4130486A (en) * 1976-02-23 1978-12-19 Pollutex Milieutechniek B.V. Method and device for the separation of a liquid-containing mixture
US4561938A (en) * 1984-02-17 1985-12-31 M/K Plank Corporation Forming roll apparatus
US5338408A (en) * 1993-02-09 1994-08-16 Gilman Paper Company Paper forming unit with two dandy rolls
US20070210015A1 (en) * 2004-04-16 2007-09-13 Kadant Black Clawson Inc. Dual Zone Wireless Pulp Washer

Also Published As

Publication number Publication date
DE2132713A1 (de) 1973-01-11
AT322965B (de) 1975-06-25
DE2132713B2 (de) 1975-08-21
SE392490B (sv) 1977-03-28
FR2141385A5 (enExample) 1973-01-19
JPS5122963B1 (enExample) 1976-07-14
GB1366002A (en) 1974-09-04

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