US3906853A - Roller arrangement in presses for the removal of water from materials - Google Patents

Roller arrangement in presses for the removal of water from materials Download PDF

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Publication number
US3906853A
US3906853A US358598A US35859873A US3906853A US 3906853 A US3906853 A US 3906853A US 358598 A US358598 A US 358598A US 35859873 A US35859873 A US 35859873A US 3906853 A US3906853 A US 3906853A
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US
United States
Prior art keywords
rollers
roller
sieve
bands
screen
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
US358598A
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English (en)
Inventor
Alois Wohlfarter
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.)
ANDRITZ-RUTHNER Inc
Original Assignee
Andritz AG
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 Andritz AG filed Critical Andritz AG
Priority to US05/486,063 priority Critical patent/US3942433A/en
Application granted granted Critical
Publication of US3906853A publication Critical patent/US3906853A/en
Assigned to ARUS ANDRITZ-RUTHNER, INC., ROBINSON PLAZA, BUILDING 3, 2ND FLOOR, PITTSBURGH, PA., 15205, A CORP OF DE. reassignment ARUS ANDRITZ-RUTHNER, INC., ROBINSON PLAZA, BUILDING 3, 2ND FLOOR, PITTSBURGH, PA., 15205, A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MASCHINENFABRIK ANDRITZ ACTIENGESELLSCHAFT
Assigned to ANDRITZ-RUTHNER, INC. reassignment ANDRITZ-RUTHNER, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: JULY 11, 1988 Assignors: ARUS ANDRITZ-RUTHNER, INC.
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • This invention relates to an improvement in a roller arrangement for removing water from fibrous material in which the material is fed between a pair of endless sieve bands which rotate in contact with each of upper and lower rollers.
  • the improvement comprises upper and lower rollers each having a smaller diameter in the operating direction of the sieve bands than the preceding roller, and the vertical axial distances of the rollers also decrease in the operating direction.
  • the invention also includes an improvement in which an additional roller is mounted above at least one upper roller contacted by both of the sieve bands, and the additional roller having a smaller diameter than the upper roller, whereby the sieve bands pass around the rollers in a a -shaped path.
  • the present invention relates to a roller arrangement in presses, which arrangement is designed for the removal of Water from materials, particularly cellulose, fibrous material, or the like, wherein a sheet, or web, of material from which the water is to be removed is fed, or passed through, between two synchronously moving, endless screens or sieves which rotate about horizontally-positioned pairs of rollers, or about offset upper and lower rollers.
  • a roller arrangement such as has been proposed for the aforementioned presses serves for removing the water from fibrous material in as simple and as rapid a fashion as is possible.
  • fibrous material in a known, or prior art, installation which consists of a plurality of superimposed pairs of rollers between which extend one screen or sieve for the upper rollers and another screen or sieve for the lower rollers.
  • the screens are endless belts, and the fibrous material is disposed therebetween.
  • the rollers By means of the rollers, the screen is pressed upon the fibrous material, and the dehydration, or the removal of water, is achieved thereby.
  • a kind of wedge-shaped configuration of the pairs of rollers is provided for at the inlet of the installation.
  • This essentially preliminarily dehydrated fibrous material then passes into the main squeezing or pressing portion.
  • the latter consists again of pairs of rollers having a greater diameter and operating at such a high contact pressure that even any residual moisture is squeezed out of the fibrous material.
  • the present invention was conceived with the object of satisfying the aforementioned requirements by selecting an appropriate roller arrangement in presses for the dehydration, or for the removal of water from, ma-
  • terials particularly cellulose, fibrous material, or the like, wherein a sheet or web of material to be dehydrated is likewise passed through, or fed, between two uniformly-moved, endless screen or sieve sheets or belts which rotate about horizontally-positioned rollers.
  • FIG. I is a schematic illustration of a dehydrating installation with the inventive provision of the rollers
  • FIG. 2 illustrates a double-roller arrangement in the main pressing or squeezing portion.
  • FIG. 1 a dehydrating or waterremoving installation is schematically shown therein.
  • This figure shows particularly the provision of the individual rollers.
  • some rollers l have been disposed in the horizontal position thereof.
  • Positioned thereover is the same number of rollers 2, and they have a greater distance with respect to the rollers l at the inlet of the material to be dehydrated. This distance becomes progressively smaller until at the end of the device or arrangement of the rollers 2 only a very small clearance exists.
  • This grouping of rollers 1 and 2 may be designated as the wedge portion. The diameter of these rollers 1 and 2 is approximately the same.
  • this wedge portion Disposed adjacent, or following, this wedge portion is the pressing or squeezing portion.
  • further rollers 3 are disposed at. a certain distance at the lower or underside.
  • the upper rollers 4 Added above the interstices of the rollers 3 are the upper rollers 4.
  • the drive rollers 5 and 6 are also provided at the end of the pressing or squeezing portion.
  • Disposed approximately in the center of these roller arrangements above and, respectively, below are carrying rollers 9, l0 and, at the reversing points of the sieve or screen bands or belts 11 and 12 are reversing rollers 7 and 8.
  • the row of rollers for example for the upper sieve or screen band or belt 12, thus consists of the rollers 2 of the wedge portion, the rollers 4 of the pressing or squeezing portion, the roller serving for the drive, and the carrying roller 9, together with the reversing roller 7.
  • the upper sieve or screen band or belt is tightened about these rollers and moves with the same circumferential speed as the lower sieve or screen band or belt 11.
  • the rollers 1 are disposed at the underside in the wedge portion and adjacent thereto the rollers 3 of the pressing or squeezing portion. Disposed adjacent to the latter, in turn, are the drive roller 6, the carrying roller 10, and the reversing roller 8. Disposed above these rollers is the lower screen or sieve band or belt 11.
  • the pairs of rollers 1 and 2 are superimposed in the wedge portion, and the axial or center distances of the rollers l and 2 are gradually decreased in the operating or traveling direction of the sieve or screen bands or belts l1 and 12 so that a wedge formation will be produced thereby.
  • the pressing or squeezing portion follows this wedge portionv
  • the rollers 3 and 4 are now no longer superimposed with respect to each other, but in each case in the interstices thereof; in other words, upon a roller 3 follows a roller 4.
  • the axial or center distances of the rollers 3 and 4 with respect to each other in the traveling or operating direction of the sieve or screen bands or belts 11 and 12 are gradually decreased.
  • the diameters of the rollers 3 and 4 are reduced.
  • This arrangement affords the advantage that the looping angle, or angle of grip, is increased as the stage of the dehydration, or water removal, progresses. Due to, and because of, the decrease of the diameters of the rollers 3 and 4, also the contact pressure is increased to the same extent. Accordingly, the diameter of the rollers 3 and 4 is dimensioned in dependence upon the drying process or operation. The contact pressure is increased in the traveling or operating direction of the sieve or screen bands or belts l1 and 12 in proportion to the drying rate.
  • the drive rollers 5 and 6 are again so positioned that the axial or center distance half will not coincide, in the horizontal plane, with the upper surface line of the last roller 3 but is instead positioned slightly thereabove, so that a downwardly-directed oblique path will be produced and result for the material discharge.
  • the arrows at the rollers 4 are intended to symbolize the displaceability thereof in the vertical direction. The same is true for the horizontal direction of the reversing rollers 7 and 8.
  • Further shown at the drive rollers 5 and 6 are arrows regarding the direction of rotation of the rollers.
  • the arrows ahead of the wedge portion between the sieve or screen bands or belts 11 and 12 indicate the operating or traveling direction of the fibrous material, as well as with dashed arrows the throughput or discharge thereof following the drive rollers 5 and 6.
  • FIG. 2 illustrates another embodiment of a roller arrangement in the main pressing or squeezing portion.
  • the lower rollers l are shown initially, and positioned thereabove are the upper rollers 2.
  • the axial or center distances are once more provided variable, and the surfaces lines result jointly in a wedge-shaped gap.
  • the widened gap of the wedge shape is provided for the introduction or inlet of the drying medium.
  • the pressing or squeezing portion is again disposed adjacent the wedge portion.
  • the former consists in this particular case of at least one pair of rollers 13 and 14 which is disposed superimposed.
  • the roller 13 is positioned in a manner such that the sieve or screen bands or belts 11 and 12 will come to rest against the lower, or underside, of the surface line of the roller 13 approximately in the horizontal plane starting from the wedge portion.
  • the roller 13 may be slightly larger than the rollers l and 2 of the wedge portion.
  • the roller 14 Secured above the roller 13 is the roller 14 which, in turn, has a diameter smaller than that of the roller 13.
  • the sieve or screen bands or belts 11 and 12 are passed, or extend, jointly in an2shape around these two rollers.
  • the drive rollers 5 and 6 Disposed at the end of the roller 14 viewed in the operating or traveling direction of the sieve or screen bands or belts are the drive rollers 5 and 6. They are positioned in such a manner that there always will be produced a downwardly-directed oblique path or course for the material discharge.
  • the pressing or squeezing portion has been shown in a contracted or compact structural manner. For this very reason it can operate with only one pair of rollers 13 and 14 because of the fact that the loop angle, or angle of grip, is very large so that the contact pressure for the dehydration is effectively raised.
  • Collecting means are arranged below the roller 14 in order to prevent liquid from being transferred to the roller 13 disposed therebelow.
  • the improvement comprising said upper and lower rollers each having a smaller diameter in the operating direction of the sieve bands than the preceding roller, and the vertical axial distances of the rollers also decrease in the operating direction.
  • a roller arrangement according to claim 1 including drive roller means effecting reversal of direction of said sieve bands, said means being so positioned that a downwardly-directed oblique path results for the material discharge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Filtration Of Liquid (AREA)
  • Press Drives And Press Lines (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Combined Means For Separation Of Solids (AREA)
US358598A 1972-07-07 1973-05-09 Roller arrangement in presses for the removal of water from materials Expired - Lifetime US3906853A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/486,063 US3942433A (en) 1972-07-07 1974-07-05 Roller arrangement in presses for the removal of water from materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT586772A AT314345B (de) 1972-07-07 1972-07-07 Walzenanordnung an Pressen zur Entwässerung von Stoffen, insbesondere Zellstoff

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/486,063 Division US3942433A (en) 1972-07-07 1974-07-05 Roller arrangement in presses for the removal of water from materials

Publications (1)

Publication Number Publication Date
US3906853A true US3906853A (en) 1975-09-23

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Application Number Title Priority Date Filing Date
US358598A Expired - Lifetime US3906853A (en) 1972-07-07 1973-05-09 Roller arrangement in presses for the removal of water from materials

Country Status (30)

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US (1) US3906853A (it)
JP (2) JPS5621878B2 (it)
AR (1) AR194657A1 (it)
AT (1) AT314345B (it)
BE (1) BE798605A (it)
BG (1) BG20825A3 (it)
BR (1) BR7305037D0 (it)
CA (1) CA988343A (it)
CH (1) CH570871A5 (it)
CS (1) CS190391B2 (it)
DD (1) DD104583A5 (it)
DE (1) DE7318852U (it)
DK (1) DK147039C (it)
ES (1) ES413990A1 (it)
FI (1) FI65831C (it)
FR (1) FR2191993B1 (it)
GB (1) GB1425613A (it)
HU (1) HU168070B (it)
IE (1) IE37826B1 (it)
IL (1) IL42388A0 (it)
IT (1) IT985807B (it)
LU (1) LU67784A1 (it)
NL (1) NL7307047A (it)
NO (2) NO142026C (it)
PL (1) PL90071B1 (it)
RO (1) RO86703B (it)
SE (2) SE397693B (it)
SU (1) SU589937A3 (it)
TR (1) TR18117A (it)
YU (1) YU35905B (it)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019431A (en) * 1973-03-17 1977-04-26 Alb. Klein Kg Method of dewatering sludge
US4561978A (en) * 1984-10-09 1985-12-31 Envirotech Corporation Multiple primary roll
US4909851A (en) * 1982-07-31 1990-03-20 Ciba-Geigy Corporation Pigment compositions
WO1996006975A1 (en) * 1994-08-31 1996-03-07 Hoffman Environmental Systems, Inc. Thin mat washing of cellulosic pulp
WO1997042374A1 (en) * 1996-05-06 1997-11-13 Beloit Technologies, Inc. Pulp and linerboard former with improved dewatering
US6228215B1 (en) 1998-04-06 2001-05-08 Hoffman Enviornmental Systems, Inc. Method for countercurrent treatment of slurries
US6248245B1 (en) 1998-05-29 2001-06-19 Ashbrook Corporation Belt press with adjustable inlet guide
US6547926B2 (en) 2000-05-12 2003-04-15 Kimberly-Clark Worldwide, Inc. Process for increasing the softness of base webs and products made therefrom
US6607638B2 (en) * 2000-05-12 2003-08-19 Kimberly-Clark Worldwide, Inc. Process for increasing the softness of base webs and products made therefrom
US6607635B2 (en) * 2000-05-12 2003-08-19 Kimberly-Clark Worldwide, Inc. Process for increasing the softness of base webs and products made therefrom
US6676807B2 (en) 2001-11-05 2004-01-13 Kimberly-Clark Worldwide, Inc. System and process for reducing the caliper of paper webs
US7314141B1 (en) * 1998-08-06 2008-01-01 Paul Hedley Day Folding belt filter
US20100032384A1 (en) * 2008-08-07 2010-02-11 William Harris Moss Method for improving belt press dewatering
US20110303379A1 (en) * 2008-12-19 2011-12-15 Boechat Joao V Device and method for producing a material web
US20120103893A1 (en) * 2009-03-09 2012-05-03 Univenture, Inc. Method and apparatus for separating particles from a liquid
GB2617470A (en) * 2022-04-08 2023-10-11 Condimentum Ltd Leaf dewatering system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT340331B (de) * 1975-05-14 1977-12-12 Andritz Ag Maschf Presse fur die entwasserung von stoffen, insbesondere fasermaterial
FI834717A (fi) * 1983-12-21 1985-06-22 Rauma Repola Oy Nipp pressfoerfarande och -anordning.
SE537052C2 (sv) * 2012-08-28 2014-12-16 Copolia Company Sa Anordning och förfarande för avvattning av vedflis

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US631567A (en) * 1899-05-06 1899-08-22 Byron J Fowler Cider-press.
US774530A (en) * 1902-05-29 1904-11-08 Rudolph Oppenheim Expressing-machine.
US995283A (en) * 1911-01-18 1911-06-13 Noah M Patton Cider-press.
US1055384A (en) * 1911-09-18 1913-03-11 Eugen Abresch Band-press for drying vegetable and mineral substances.
US3459122A (en) * 1965-05-08 1969-08-05 Klein Kg A Apparatus for the continuous extraction of moisture from suspended matter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US631567A (en) * 1899-05-06 1899-08-22 Byron J Fowler Cider-press.
US774530A (en) * 1902-05-29 1904-11-08 Rudolph Oppenheim Expressing-machine.
US995283A (en) * 1911-01-18 1911-06-13 Noah M Patton Cider-press.
US1055384A (en) * 1911-09-18 1913-03-11 Eugen Abresch Band-press for drying vegetable and mineral substances.
US3459122A (en) * 1965-05-08 1969-08-05 Klein Kg A Apparatus for the continuous extraction of moisture from suspended matter

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019431A (en) * 1973-03-17 1977-04-26 Alb. Klein Kg Method of dewatering sludge
US4144807A (en) * 1973-06-13 1979-03-20 Alb. Klein Kg Device for dewatering sludge
US4909851A (en) * 1982-07-31 1990-03-20 Ciba-Geigy Corporation Pigment compositions
US4561978A (en) * 1984-10-09 1985-12-31 Envirotech Corporation Multiple primary roll
WO1996006975A1 (en) * 1994-08-31 1996-03-07 Hoffman Environmental Systems, Inc. Thin mat washing of cellulosic pulp
US5753074A (en) * 1994-08-31 1998-05-19 Hoffman Environmental Systems, Inc. Method of washing a thin mat of cellulosic pulp
WO1997042374A1 (en) * 1996-05-06 1997-11-13 Beloit Technologies, Inc. Pulp and linerboard former with improved dewatering
US5783045A (en) * 1996-05-06 1998-07-21 Beloit Technologies, Inc. Pulp and linerboard former with improved dewatering
US6228215B1 (en) 1998-04-06 2001-05-08 Hoffman Enviornmental Systems, Inc. Method for countercurrent treatment of slurries
US6248245B1 (en) 1998-05-29 2001-06-19 Ashbrook Corporation Belt press with adjustable inlet guide
US6454102B2 (en) 1998-05-29 2002-09-24 Ashbrook Corporation Belt press with adjustable inlet guide
US7314141B1 (en) * 1998-08-06 2008-01-01 Paul Hedley Day Folding belt filter
US20030201081A1 (en) * 2000-05-12 2003-10-30 Drew Robert A. Process for increasing the softness of base webs and products made therefrom
US6607635B2 (en) * 2000-05-12 2003-08-19 Kimberly-Clark Worldwide, Inc. Process for increasing the softness of base webs and products made therefrom
US6607638B2 (en) * 2000-05-12 2003-08-19 Kimberly-Clark Worldwide, Inc. Process for increasing the softness of base webs and products made therefrom
US6939440B2 (en) 2000-05-12 2005-09-06 Kimberly-Clark Worldwide, Inc. Creped and imprinted web
US6949166B2 (en) 2000-05-12 2005-09-27 Kimberly-Clark Worldwide, Inc. Single ply webs with increased softness having two outer layers and a middle layer
US6547926B2 (en) 2000-05-12 2003-04-15 Kimberly-Clark Worldwide, Inc. Process for increasing the softness of base webs and products made therefrom
US6676807B2 (en) 2001-11-05 2004-01-13 Kimberly-Clark Worldwide, Inc. System and process for reducing the caliper of paper webs
US20100032384A1 (en) * 2008-08-07 2010-02-11 William Harris Moss Method for improving belt press dewatering
US7964105B2 (en) * 2008-08-07 2011-06-21 William Harris Moss Method for improving belt press dewatering
US20110303379A1 (en) * 2008-12-19 2011-12-15 Boechat Joao V Device and method for producing a material web
US8382956B2 (en) * 2008-12-19 2013-02-26 Voith Patent Gmbh Device and method for producing a material web
US8580083B2 (en) 2008-12-19 2013-11-12 Voith Patent Gmbh Device and method for producing a material web
US8728277B2 (en) 2008-12-19 2014-05-20 Voith Patent Gmbh Device and method for producing a material web
US20120103893A1 (en) * 2009-03-09 2012-05-03 Univenture, Inc. Method and apparatus for separating particles from a liquid
US8286801B2 (en) * 2009-03-09 2012-10-16 Univenture, Inc. Method and apparatus for separating particles from a liquid
GB2617470A (en) * 2022-04-08 2023-10-11 Condimentum Ltd Leaf dewatering system

Also Published As

Publication number Publication date
AT314345B (de) 1974-03-25
DK147039C (da) 1984-09-03
ES413990A1 (es) 1976-02-01
BR7305037D0 (pt) 1975-09-02
AR194657A1 (es) 1973-07-31
FI65831B (fi) 1984-03-30
DE2325428A1 (de) 1974-01-17
CS190391B2 (en) 1979-05-31
NO142026C (no) 1980-06-18
RO86703A (ro) 1985-04-17
SE418203B (sv) 1981-05-11
DD104583A5 (it) 1974-03-12
PL90071B1 (it) 1976-12-31
BG20825A3 (bg) 1975-12-20
NO151376B (no) 1984-12-17
DE2325428B2 (de) 1975-11-13
RO86703B (ro) 1985-05-03
IE37826B1 (en) 1977-10-26
NO792088L (no) 1974-01-08
IL42388A0 (en) 1973-07-30
NO151376C (no) 1985-03-27
IE37826L (en) 1974-01-07
SE7610791L (sv) 1976-09-29
NO142026B (no) 1980-03-10
YU35905B (en) 1981-08-31
JPS5621878B2 (it) 1981-05-21
JPS4935602A (it) 1974-04-02
HU168070B (it) 1976-02-28
FR2191993B1 (it) 1976-09-17
JPS51138958A (en) 1976-11-30
LU67784A1 (it) 1973-08-16
FI65831C (fi) 1984-07-10
DE7318852U (de) 1976-09-30
CA988343A (en) 1976-05-04
GB1425613A (en) 1976-02-18
FR2191993A1 (it) 1974-02-08
BE798605A (fr) 1973-08-16
DK147039B (da) 1984-03-26
SE397693B (sv) 1977-11-14
TR18117A (tr) 1976-09-30
SU589937A3 (ru) 1978-01-25
NL7307047A (it) 1974-01-09
IT985807B (it) 1974-12-20
CH570871A5 (it) 1975-12-31

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ARUS ANDRITZ-RUTHNER, INC., ROBINSON PLAZA, BUILDI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MASCHINENFABRIK ANDRITZ ACTIENGESELLSCHAFT;REEL/FRAME:004610/0431

Effective date: 19860919

Owner name: ARUS ANDRITZ-RUTHNER, INC., ROBINSON PLAZA, BUILDI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MASCHINENFABRIK ANDRITZ ACTIENGESELLSCHAFT;REEL/FRAME:004610/0431

Effective date: 19860919

AS Assignment

Owner name: ANDRITZ-RUTHNER, INC.

Free format text: CHANGE OF NAME;ASSIGNOR:ARUS ANDRITZ-RUTHNER, INC.;REEL/FRAME:005584/0302

Effective date: 19880921