EP0088859A2 - Trommel enthaltend eine Tragfläche mit Gitterstruktur für Maschinen zur Herstellung von Papier, Pappe, Asbestzement oder dergleichen - Google Patents

Trommel enthaltend eine Tragfläche mit Gitterstruktur für Maschinen zur Herstellung von Papier, Pappe, Asbestzement oder dergleichen Download PDF

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Publication number
EP0088859A2
EP0088859A2 EP82830235A EP82830235A EP0088859A2 EP 0088859 A2 EP0088859 A2 EP 0088859A2 EP 82830235 A EP82830235 A EP 82830235A EP 82830235 A EP82830235 A EP 82830235A EP 0088859 A2 EP0088859 A2 EP 0088859A2
Authority
EP
European Patent Office
Prior art keywords
drum
bars
paper
heads
wall
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
EP82830235A
Other languages
English (en)
French (fr)
Other versions
EP0088859B1 (de
EP0088859A3 (en
Inventor
Carlo De Iuliis
Alfonso De Iuliis
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.)
De Iuliis Carlo & Alfonso SpA
Original Assignee
De Iuliis Carlo & Alfonso SpA
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 De Iuliis Carlo & Alfonso SpA filed Critical De Iuliis Carlo & Alfonso SpA
Priority to AT82830235T priority Critical patent/ATE31756T1/de
Publication of EP0088859A2 publication Critical patent/EP0088859A2/de
Publication of EP0088859A3 publication Critical patent/EP0088859A3/en
Application granted granted Critical
Publication of EP0088859B1 publication Critical patent/EP0088859B1/de
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
    • D21F1/60—Cylinder moulds
    • 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
    • D21F1/44—Watermarking devices
    • D21F1/46—Dandy rolls
    • 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
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D21F3/105—Covers thereof

Definitions

  • the present invention relates to a drum adapted to be used as a forming or suction drum in machines for the manufacture of paper, paper-board, asbestos cement or the like.
  • This drum has a cylindrical carrying side wall of a latticed structure, which is obtained by means of two pluralities of small bars extending helically right-hand and left-hand respectively, crossing with other and restrained in their cross points.
  • Drums which have perforated side wall and which are used as forming or suction drums in the machines for the manufacture of a web of paper, paper-board, asbestos cement or the like, and which will be formed around said drum which is covered by a wire cloth underneath of which a fabric undercloth is placed and through which passes the water separated from the employed mixture, which latter being compressed under the action of one or more mechanized pressure ) cylinders.
  • the mixture can be applied on said cloths by means of a distribution box or it can be collected by means of the side wall of the drum which is partially plunged into a tank which contains the mixture.
  • Said known and broadly used drums are constituted of a pair of heads mounted on a longitudinal shaft and between which and on said shaft, also a plurality of arm dials are keyed which are equally spaced apart from each other respectively supporting a peripheral rim.
  • Said heads and the rims, and or the arms dials support longitudinal bars which are equally angularly spaced apart from each other so as to form a drum, having a perforated side wall, on which the wire cloth and the fabric cloth are applied, on which the web of paper or the like will be obtained under the action of the pressure applied to said web by means of the pressure cylinders with the interposition of a continues felt band.
  • the drum is caused to rotate by the mechanized rollers by means of its shaft said drum freely rotate into support sleeves.
  • perforated pipes are mounted in the inside of the drums of the aforementioned type; said pipes are connected to a suction source so as to create, through the perforated wall of the drum and the cloths placed thereupon, a suction effect capable of counter-balancing the centrifugal force.
  • this solution has the inconvenience to be complicated and therefore expensive, since each suction pipe or bar, which in the known drums had to be made integral with the drum, as a result of the presence of the shaft and of the interposed bar dials thereof, was able to operate only on a predetermined sector of the drum, which corresponds at most to the 30-40% of the whole side surface of the drum. Therefore the number if the suction pipes had to be considerable and complicated connections of said pipes to the suction source were required.
  • Such a cleaning system in the known drums could be only performed, acting from the outside, and in a little efficient manner, by employing pressurized washing jets, directed tangentially or nearly tangentially with respect to the side surface of the drum.
  • This problem becomes more important in the case of the manufacture of webs or plates of asbestos cement, on account of the specific characteristics of such a mixture, consisting of asbestos fibers and cement which is used as binding medium.
  • the very small particles of the cement powder obstruct the cloths so that it results that a bad and irregular formation of the layers which compose the web takes place, so that at frequent time-intervals radical washings of the drums with a suitable cleaning solution become necessary.
  • the drums have to be disassembled and transported to the repair shop for carrying out complete cleaning operations.
  • the purpose of the present invention is thus that of overcoming the inconveniences of the known drums which are used in the machines for the manufacture of the paper, paper-board asbestos cement and the like.
  • the invention provides to realize a drum which can be used, as forming drum or as suction drum, and which comprises two heads provided with coaxial orifices and between which is fixed a peripheral cylindrical carrying wall of a latticed structure.
  • tubular members are made integral which serve as means for supporting the drum and which also permit the free rotation of this latter about its axis, while through said orifices perforated washing pipes can be inserted in the inside of the drum, said pipes supplying a pressurized liquid fed from an external source.
  • pipes can be now stationary or can swing about a fixed axis.
  • one washing pipe can be sufficient in order to attain an optimal cleaning, since said pipe can be mounted near the lower portion of the revolving drum; said pipe is provided with radial nozzles for the delivery of the washing liquid.
  • the peripheral carrying wall of this drum is obtained by an interconnection of two pluralities of small bars extending helically right-hand and left-hand respecti vely and which are uniformely spaced apart from each other and are restrained to each other in their cross points, owing to the presence of transversal slots, having a length substantially equal to the half width of each bar at both its ends said wall is connected to the two heads and is capable of bearing all the involved stresses, without requiring that in the inside of the drum any supporting means for said wall have to be provided.
  • the heads selves are shaped so as to form hollow supporting means: further there is no more any bar dial as in the conventional drums so that the inner cavity of the drums is entirely free so that one or more washing spray pipes can be inserted which pass through the orifices arranged in the heads, and said pipes can be stationary or can swing about a fixed axis of course with an equal simplicity, stationary suction pipes could be mounted for the above mentioned purposes.
  • said pipe can be placed in the most convenable position so as to be able to act on each drum sector, when said sector passes in the front of said pipe.
  • the so obtained latticed wall is such that the area of orifices or passages thereof will be equal to about 70-75% of the total side area of said side wall of the drums.
  • the configuration of the wall structure is such as to present characteristics of strength which are substantially uniform in each direction so that the mixture will be distributed and compressed with a complete uniformity along said wall and that permits to attain better results as well as to enable the drum to work at speeds which do not only reach 2m/sec but are also higher than this latter, by means of the insertion in the inside of the drum of any sufficient number of suction devices.
  • the drum comprises two heads generally marked 2, between which a peripherally cylindrical carrying wall is mounted which is generally marked 1.
  • a wall 1 consists of a strong latticed structure, which is constituted, in combination, of two pluralities la and lb of small metal bars, fixed at their ends along the periphery of the heads 2 and which extend helically, right-hand and left-hand respectively, with the same pitch and which are angularly spaced apart from each other, in such a manner as to form a latticed structure, through which are defined substantially radial passages each having a quadrangular cross section.
  • the bars la, lb cross each others and are mutually restrained in their cross points by means of transversal slots 3a and 3b having a length substantially equal to the half width of each bar la, lb; slots 3a are cut through the outer edges of the bars la and the slots 3b are cut through the inner edges of the bars lb ( Figure 1).
  • the restrained connection between the bars la, Ib can be improved by weldings applied along the joint zones.
  • a cylindrical latticed side wall 1 is created which is supported at their ends only by the two heads 2.
  • These latter are constituted of peripheral rings generally marked 4 supported by a disc-like member 5 which axially extends outwardly with a hollow hub 5a; said hubs define inner coaxial openings.
  • Each ring 4 has a longitudinal cylindrical flange extending towards the wall 1 respectively ( Figures 2 to 4) which has an outer shoulder 4b of a depth lesser than the thickness of the cylindrical wall 1.
  • grooves 6 are arranged so shaped as to be able to receive the inner edges of the respective ends of the bars la, lb in their use position. The iepth of the grooves 6 with the addition of that of the shoulder 4b is such to bring the outer edges of the 3 ars la, lb to come into alignement with the outer cylindrical side surface 4c of the rings 4.
  • each ring 4 has an annular shoulder 4b at its outer surface, which is designed to receive the radial peripheral flange 5b of the head disc 5 which is fixed to the respective ring 4, in any disassemblable manner, by means of screws, for instance inserted in the holes 17 ( Figures 2 to 4).
  • Each pipe 8, 8a will be connected at least at one of its ends, which the interposition of a control valve 10, to a feeding source of a pressurized washing liquid which may be water that could contain also any additive adapted to promove the removal of the deposits formed in the inside of the drum or on the cloths which are provided for filtering the draining water which passes through the wall 1.
  • a pressurized washing liquid which may be water that could contain also any additive adapted to promove the removal of the deposits formed in the inside of the drum or on the cloths which are provided for filtering the draining water which passes through the wall 1.
  • one or more perforated suction pipes can be mounted in an equally simple manner.
  • these latter pipes will be stationary so that one or more can be mounted only in that zone before which successively passes that sector of the drum 1 through which has to be created a suction action adapted to compensate for the effect of the centrifugal force, in such a manner to permit to increase the operative peripherical speed of the drum in order to increase the efficiency of the machine.
  • the suction pipe is stationary, in general it will be sufficient to employ only one pipe in order to obtain a satisfactory suction effect.
  • FIGS. 5 and 6 show a second embodiment wherein the heads 2a consist of peripheral rings 4 identical to those which have been shown and described in the first embodiment, while, instead of the discs, simple shaped rings, are provided generally indicated 12.
  • Each ring 12 is provided with an inner radial flange 12a designated to be housed in the annular facing shoulder 4d of the respective ring so as to form a cylindrical band 12b designated to form the sliding and guiding race for at least two idle pulleys 13 mounted on small fixed longitudinal shafts 14.
  • a cylindrical band 12b designated to form the sliding and guiding race for at least two idle pulleys 13 mounted on small fixed longitudinal shafts 14.
  • only two pulleys 13 are provided, which are mounted near the lower part of the drum, but nothing prevents that at least one or more guiding pulley be provided also in other positions.

Landscapes

  • Paper (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
EP82830235A 1981-12-29 1982-09-17 Trommel enthaltend eine Tragfläche mit Gitterstruktur für Maschinen zur Herstellung von Papier, Pappe, Asbestzement oder dergleichen Expired EP0088859B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82830235T ATE31756T1 (de) 1981-12-29 1982-09-17 Trommel enthaltend eine tragflaeche mit gitterstruktur fuer maschinen zur herstellung von papier, pappe, asbestzement oder dergleichen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT5002981 1981-12-29
IT50029/81A IT1172198B (it) 1981-12-29 1981-12-29 Struttura reticolare periferica per cilindri utilizzati nellhindustria della carta del cartone e del fibro cemento

Publications (3)

Publication Number Publication Date
EP0088859A2 true EP0088859A2 (de) 1983-09-21
EP0088859A3 EP0088859A3 (en) 1984-12-12
EP0088859B1 EP0088859B1 (de) 1988-01-07

Family

ID=11272114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82830235A Expired EP0088859B1 (de) 1981-12-29 1982-09-17 Trommel enthaltend eine Tragfläche mit Gitterstruktur für Maschinen zur Herstellung von Papier, Pappe, Asbestzement oder dergleichen

Country Status (4)

Country Link
EP (1) EP0088859B1 (de)
AT (1) ATE31756T1 (de)
DE (1) DE3277920D1 (de)
IT (1) IT1172198B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002055776A2 (de) * 2001-01-11 2002-07-18 Fleissner Gmbh & Co: Maschinenfabrik Absaugeinrichtung an einer textilmaschine wie insbesondere wasservernadelungseinrichtung
WO2004044301A1 (de) * 2002-11-14 2004-05-27 Fleissner Gmbh Vorrichtung zum durchströmenden oder beaufschlagenden behandeln von bahnförmiger ware

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT97795B (de) * 1923-02-05 1924-09-10 Paul Lindner Untersieb für Siebzylinder von Papier- oder Pappenmaschinen.
AT297474B (de) * 1969-02-19 1972-03-27 Trefimetaux Walze für die Papierherstellung
AT351355B (de) * 1975-11-22 1979-07-25 Voith Gmbh J M Zylinderfoermige fuehrungseinrichtung fuer faser- stoffbahnen in der siebpartie einer papier- maschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT97795B (de) * 1923-02-05 1924-09-10 Paul Lindner Untersieb für Siebzylinder von Papier- oder Pappenmaschinen.
AT297474B (de) * 1969-02-19 1972-03-27 Trefimetaux Walze für die Papierherstellung
AT351355B (de) * 1975-11-22 1979-07-25 Voith Gmbh J M Zylinderfoermige fuehrungseinrichtung fuer faser- stoffbahnen in der siebpartie einer papier- maschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002055776A2 (de) * 2001-01-11 2002-07-18 Fleissner Gmbh & Co: Maschinenfabrik Absaugeinrichtung an einer textilmaschine wie insbesondere wasservernadelungseinrichtung
WO2002055776A3 (de) * 2001-01-11 2002-09-12 Fleissner Maschf Gmbh Co Absaugeinrichtung an einer textilmaschine wie insbesondere wasservernadelungseinrichtung
US7188631B2 (en) 2001-01-11 2007-03-13 Fleissner Gmbh & Co. Maschinenfabrik Suction device on a textile machine, especially a water needling device
WO2004044301A1 (de) * 2002-11-14 2004-05-27 Fleissner Gmbh Vorrichtung zum durchströmenden oder beaufschlagenden behandeln von bahnförmiger ware

Also Published As

Publication number Publication date
IT1172198B (it) 1987-06-18
DE3277920D1 (en) 1988-02-11
EP0088859B1 (de) 1988-01-07
EP0088859A3 (en) 1984-12-12
ATE31756T1 (de) 1988-01-15
IT8150029A0 (it) 1981-12-29

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