WO1996016776A1 - Device for levelling a particulate material web - Google Patents

Device for levelling a particulate material web Download PDF

Info

Publication number
WO1996016776A1
WO1996016776A1 PCT/SE1995/001402 SE9501402W WO9616776A1 WO 1996016776 A1 WO1996016776 A1 WO 1996016776A1 SE 9501402 W SE9501402 W SE 9501402W WO 9616776 A1 WO9616776 A1 WO 9616776A1
Authority
WO
WIPO (PCT)
Prior art keywords
discs
shaft
material web
wood
levelling
Prior art date
Application number
PCT/SE1995/001402
Other languages
French (fr)
Inventor
Lennart Gustavsson
Original Assignee
ABB Fläkt AB
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 ABB Fläkt AB filed Critical ABB Fläkt AB
Priority to US08/849,108 priority Critical patent/US5855923A/en
Priority to AU41263/96A priority patent/AU4126396A/en
Priority to DE69515185T priority patent/DE69515185T2/en
Priority to EP95939454A priority patent/EP0794854B1/en
Priority to AT95939454T priority patent/ATE189872T1/en
Priority to CA002206158A priority patent/CA2206158C/en
Priority to NZ296615A priority patent/NZ296615A/en
Publication of WO1996016776A1 publication Critical patent/WO1996016776A1/en
Priority to FI972234A priority patent/FI972234A0/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres

Definitions

  • This invention concerns a device for levelling a particulate material web, such as a wood-fibre mat laid out on a wire and intended for the production of wood- fibre boards, said material web being moved in relation to the device.
  • glue-coated wood fibres are pneumatically conveyed from a container to a forming station.
  • the wood fibres are laid out in the form of a mat on a wire, by means of which the fibres are conveyed to a pressing plant, where they are pressed into fibre boards under given pressure and temperature conditions.
  • the fibre mat passes a milling roller which is arranged transversely of the direction of conveyance and which mills the fibre mat to give it a smooth upper sur ⁇ face as well as a suitable thickness and a suitable weight before the pressing operation.
  • the fibres removed from the fibre mat in the milling operation are recycled to the container, so as to subsequently be returned to the forming station and be laid out on the wire.
  • the amount of wood fibres separated by the milling roller is fairly large and may, in some applications, be up to 25%. Since the amount of fibres separated and thus recirculat ⁇ ed is fairly large, the fibres are worn and dehydrated to a disproportionate extent. Furthermore, the glue consump ⁇ tion and the power requirement of the fibre conveyance become excessive.
  • the object of this invention is, therefore, to pro ⁇ vide a levelling device complementing the prior-art mill- ing roller, thereby to considerably reduce the amount of fibres separated and recirculated.
  • a device which is of the type mentioned by way of in ⁇ troduction and which is characterised by a rotary shaft, which is adapted to be arranged transversely of the direction of movement of the material web and on which a plurality of elliptic discs, through the centres of which extends the shaft, are mounted at an axial distance from one another so as to rotate with the shaft, the discs being so inclined about their minor axes in relation to the shaft as to have a circular axial projection.
  • the discs are mounted at such an axial distance from one another that adjoining discs overlap in the axial direction.
  • the discs are inclined at an angle of 45-80°, preferably about 60°.
  • Fig. 1 is a side view of a device according to the invention.
  • Fig. 2 is a schematic perspective view illustrating in more detail the geometric relationships of the compo ⁇ nent parts of the device.
  • Fig. 1 shows a levelling device 1 according to the invention, which is mounted above a wire 2 on which is laid out a material web 3 in the form of a wood-fibre mat.
  • the material web 3 passes the device 1 on its way from a forming station (not shown) to a pressing plant (not shown) for the production of fibre boards.
  • the device 1 comprises a shaft 4, which has a cir ⁇ cular cross-section and extends transversely of the direction of conveyance of the wire 2 and the material web 3 and which, at its ends, is rotatably mounted in a frame 5.
  • the shaft 4 is vertically adjustable to enable the device to be adapted to the thickness of the material web 3.
  • the shaft 4 supports a plurality of identical discs 6, which are fixed to the shaft 4 with an axial spacing.
  • the discs 6 are evenly distributed along the shaft 4 in such a manner that adjoining discs 6 overlap in the axial direction.
  • Each disc 6 has the shape of an ellipse.
  • the shaft 4 extends through a centre hole 7 (only illustrated in the case of a disc shown in section in Fig. 1) in each disc 6, this centre hole 7 having the shape of an ellipse whose major axis coincides with that of the ellipse of the disc.
  • Fig. 2 which in Fig. 1 is perpendicular to the plane of the drawing, each disc 6 is inclined at an angle ⁇ to the shaft 4. This angle ⁇ may vary between 45° and 80° but preferably is 60°, as in the embodiment illustrated in Fig. 1.
  • the discs 6 have such an elliptic shape and are so inclined about their minor axes Al (see Fig. 2) as to have a circular axial projection, which in Fig. 2 is illustrated with the aid of two broken-line circles C.
  • Fig. 2 When the shaft 4 rotates about its axis A (Fig. 2), which extends through the centres of the discs 6, each point on the circumferences of the discs 6 thus describes, as seen in axial projection, a circle whose diameter equals the length of the minor axis Al of the ellipse of the disc.
  • the discs 6 perform an axially reciprocating throwing movement inside the imaginary, horizontal and straight tube T whose cross-section is defined by the two circles C (see Fig. 2 ) .
  • the lowermost point of the discs 6, which is located on the circumfe- rential surface of the imaginary tube T is then axially reciprocated along a straight line L and levels the mate ⁇ rial web 3 to the level of this line.
  • the above levelling device according to the invention considerably reduces the amount of fibres separated and recirculated.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)
  • Paper (AREA)

Abstract

A device for levelling a particulate material web (3), such as a wood-fibre mat laid out on a wire (2) and intended for the production of wood-fibre boards, the material web being moved in relation to the device, comprises a rotary shaft (4) and a plurality of elliptic discs (6) mounted thereon. The shaft (4) is adapted to be arranged transversely of the direction of movement of the material web (3) and extends through the centres of the discs (6). The discs (6) are mounted at an axial distance from one another so as to rotate with the shaft (4). About their minor axes, the discs (6) are so inclined in relation to the shaft (4) as to have a circular axial projection.

Description

DEVICE FOR LEVELLING A PARTICULATE MATERIAL WEB
This invention concerns a device for levelling a particulate material web, such as a wood-fibre mat laid out on a wire and intended for the production of wood- fibre boards, said material web being moved in relation to the device.
In the production of wood-fibre boards, glue-coated wood fibres are pneumatically conveyed from a container to a forming station. In this station, the wood fibres are laid out in the form of a mat on a wire, by means of which the fibres are conveyed to a pressing plant, where they are pressed into fibre boards under given pressure and temperature conditions. On its way to the pressing plant, the fibre mat passes a milling roller which is arranged transversely of the direction of conveyance and which mills the fibre mat to give it a smooth upper sur¬ face as well as a suitable thickness and a suitable weight before the pressing operation. The fibres removed from the fibre mat in the milling operation are recycled to the container, so as to subsequently be returned to the forming station and be laid out on the wire. The amount of wood fibres separated by the milling roller is fairly large and may, in some applications, be up to 25%. Since the amount of fibres separated and thus recirculat¬ ed is fairly large, the fibres are worn and dehydrated to a disproportionate extent. Furthermore, the glue consump¬ tion and the power requirement of the fibre conveyance become excessive.
The object of this invention is, therefore, to pro¬ vide a levelling device complementing the prior-art mill- ing roller, thereby to considerably reduce the amount of fibres separated and recirculated.
According to the invention, this object is achieved by a device which is of the type mentioned by way of in¬ troduction and which is characterised by a rotary shaft, which is adapted to be arranged transversely of the direction of movement of the material web and on which a plurality of elliptic discs, through the centres of which extends the shaft, are mounted at an axial distance from one another so as to rotate with the shaft, the discs being so inclined about their minor axes in relation to the shaft as to have a circular axial projection.
In a preferred embodiment, the discs are mounted at such an axial distance from one another that adjoining discs overlap in the axial direction. Conveniently, the discs are inclined at an angle of 45-80°, preferably about 60°.
The invention will now be described in more detail with reference to the accompanying drawings, in which
Fig. 1 is a side view of a device according to the invention, and
Fig. 2 is a schematic perspective view illustrating in more detail the geometric relationships of the compo¬ nent parts of the device.
Thus, Fig. 1 shows a levelling device 1 according to the invention, which is mounted above a wire 2 on which is laid out a material web 3 in the form of a wood-fibre mat. The material web 3 passes the device 1 on its way from a forming station (not shown) to a pressing plant (not shown) for the production of fibre boards. The device 1 comprises a shaft 4, which has a cir¬ cular cross-section and extends transversely of the direction of conveyance of the wire 2 and the material web 3 and which, at its ends, is rotatably mounted in a frame 5. In a manner not shown in detail, the shaft 4 is vertically adjustable to enable the device to be adapted to the thickness of the material web 3.
The shaft 4 supports a plurality of identical discs 6, which are fixed to the shaft 4 with an axial spacing. The discs 6 are evenly distributed along the shaft 4 in such a manner that adjoining discs 6 overlap in the axial direction. Each disc 6 has the shape of an ellipse. The shaft 4 extends through a centre hole 7 (only illustrated in the case of a disc shown in section in Fig. 1) in each disc 6, this centre hole 7 having the shape of an ellipse whose major axis coincides with that of the ellipse of the disc. About its minor axis Al (Fig. 2), which in Fig. 1 is perpendicular to the plane of the drawing, each disc 6 is inclined at an angle α to the shaft 4. This angle α may vary between 45° and 80° but preferably is 60°, as in the embodiment illustrated in Fig. 1.
The discs 6 have such an elliptic shape and are so inclined about their minor axes Al (see Fig. 2) as to have a circular axial projection, which in Fig. 2 is illustrated with the aid of two broken-line circles C. When the shaft 4 rotates about its axis A (Fig. 2), which extends through the centres of the discs 6, each point on the circumferences of the discs 6 thus describes, as seen in axial projection, a circle whose diameter equals the length of the minor axis Al of the ellipse of the disc. During this rotation, the discs 6 perform an axially reciprocating throwing movement inside the imaginary, horizontal and straight tube T whose cross-section is defined by the two circles C (see Fig. 2 ) . The lowermost point of the discs 6, which is located on the circumfe- rential surface of the imaginary tube T, is then axially reciprocated along a straight line L and levels the mate¬ rial web 3 to the level of this line.
When vertically adjusted in suitable fashion and used as a complement to the prior-art milling roller described by way of introduction, the above levelling device according to the invention considerably reduces the amount of fibres separated and recirculated.
In each of the examples illustrated in Figs 1 and 2, all the discs 6 occupy the same rotational position as regards rotation about the shaft 4. This need not, how¬ ever, be the case, and the discs 6 may separately or in groups occupy different rotational positions with respect to the shaft 4, if only the inclination about the minor axis Al of the ellipse is the same (60° in Fig. 1) for all the discs 6, such that the axial projection of all the discs 6 consists of one and the same circle.

Claims

1. A device for levelling a particulate material web (3), such as a wood-fibre mat (3) laid out on a wire (2) and intended for the production of wood-fibre boards, said material web being moved in relation to the device, c h a r a c t e r i s e d by a rotary shaf (4), which is adapted to be arranged transversely of the direction of movement of the material web (3) and on which a plurali¬ ty of elliptic discs (6), through the centres of which extends the shaft ( ), are mounted at an axial distance from one another so as to rotate with the shaft, the discs (6) being so inclined about their minor axes (Al) in relation to the shaft (4) as to have a circular axial projection (C).
2. A device as set forth in claim 1, c h a r a c ¬ t e r i s e d in that the discs (6) are mounted at such an axial distance from one another that adjoining discs overlap in the axial direction.
3. A device as set forth in claim 1 or 2, c h a r ¬ a c t e r i s e d in that the discs (6) are inclined at an angle of 45-80°.
4. A device as set forth in claim 3, c h a r a c - t e r i s e d in that the discs (6) are inclined at an angle of about 60°.
PCT/SE1995/001402 1994-11-28 1995-11-24 Device for levelling a particulate material web WO1996016776A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US08/849,108 US5855923A (en) 1994-11-28 1995-11-24 Device for levelling a particulate material web
AU41263/96A AU4126396A (en) 1994-11-28 1995-11-24 Device for levelling a particulate material web
DE69515185T DE69515185T2 (en) 1994-11-28 1995-11-24 DEVICE FOR LEVELING PARTICULATE MATERIAL LEVELS
EP95939454A EP0794854B1 (en) 1994-11-28 1995-11-24 Device for levelling a particulate material web
AT95939454T ATE189872T1 (en) 1994-11-28 1995-11-24 DEVICE FOR LEVELING PARTICLE-SHAPED MATERIAL WEBS
CA002206158A CA2206158C (en) 1994-11-28 1995-11-24 Device for levelling a particulate material web
NZ296615A NZ296615A (en) 1994-11-28 1995-11-24 Wire laid wood fibre mat leveller: rotating shaft mounted inclined spaced elliptical discs
FI972234A FI972234A0 (en) 1994-11-28 1997-05-27 A device for smoothing a tissue of chip material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9404103A SE503676C2 (en) 1994-11-28 1994-11-28 Apparatus for smoothing a material web consisting of particles
SE9404103-5 1994-11-28

Publications (1)

Publication Number Publication Date
WO1996016776A1 true WO1996016776A1 (en) 1996-06-06

Family

ID=20396123

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/001402 WO1996016776A1 (en) 1994-11-28 1995-11-24 Device for levelling a particulate material web

Country Status (15)

Country Link
US (1) US5855923A (en)
EP (1) EP0794854B1 (en)
CN (1) CN1077005C (en)
AR (1) AR000205A1 (en)
AT (1) ATE189872T1 (en)
AU (1) AU4126396A (en)
CA (1) CA2206158C (en)
DE (1) DE69515185T2 (en)
ES (1) ES2142501T3 (en)
FI (1) FI972234A0 (en)
NZ (1) NZ296615A (en)
PT (1) PT794854E (en)
SE (1) SE503676C2 (en)
WO (1) WO1996016776A1 (en)
ZA (1) ZA959837B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998036884A1 (en) * 1997-02-24 1998-08-27 Sunds Defibrator Industries Aktiebolag Device for spreading and distributing particles on a material web
WO2000000332A1 (en) * 1998-06-26 2000-01-06 Valmet Fibertech Ab Method for forming of a fiber mat
DE19909967C1 (en) * 1999-03-06 2000-06-08 Babcock Bsh Gmbh Plaster or plaster-fiberboard surface smoothing device, with tool shaft fitted with several material application elements

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10064541A1 (en) * 2000-12-22 2003-04-30 Dieffenbacher Schenck Panel Equalizing roller
US6866740B2 (en) * 2001-11-28 2005-03-15 Masonite Corporation Method of manufacturing contoured consolidated cellulosic panels with variable basis weight
DE10347298A1 (en) * 2003-10-08 2005-05-04 Dieffenbacher Gmbh & Co Kg Scattering device for producing wooden fiberboard, includes levelling roll with slanting angled brackets on its mantle surface
DE10347297A1 (en) * 2003-10-08 2005-05-04 Dieffenbacher Gmbh & Co Kg Levelling roller to even out a fleece made of fluid matter sprinkled onto a moulding strip, in particular for glued wooden barrels with a rotatable drum, has guide pieces distributed on its surface offset against guide pieces on the drum

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973865C (en) * 1948-04-30 1960-06-30 Triangel Holzwerkstoff Ges Mit Device for the production of a fleece of the same density, equally thick and of the same height everywhere, made of chip material mixed with binding agents for the production of wood chip materials

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US979547A (en) * 1910-01-29 1910-12-27 Charles Ladd Norton Process for forming fibrous sheets.
US3067456A (en) * 1953-10-05 1962-12-11 Allwood Inc Apparatus for producing pressed wood-particle panels
US4167378A (en) * 1976-02-06 1979-09-11 Mo Och Domsjo Ab Apparatus for shredding and dry-defibrating compressed cellulose pulp and forming a batt of the resulting cellulosic fibrous material
SU1514617A1 (en) * 1988-01-05 1989-10-15 Kompleksnyj Proektno Izyskatel Device for manufacturing fiber mat
DE3811677A1 (en) * 1988-04-07 1989-10-19 Baehre & Greten DEVICE FOR COMPARISONING THE AREA WEIGHT DISTRIBUTION OF FLEECE
DE3841276C1 (en) * 1988-12-08 1990-05-17 G. Siempelkamp Gmbh & Co, 4150 Krefeld, De

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973865C (en) * 1948-04-30 1960-06-30 Triangel Holzwerkstoff Ges Mit Device for the production of a fleece of the same density, equally thick and of the same height everywhere, made of chip material mixed with binding agents for the production of wood chip materials

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998036884A1 (en) * 1997-02-24 1998-08-27 Sunds Defibrator Industries Aktiebolag Device for spreading and distributing particles on a material web
US6283741B1 (en) 1997-02-24 2001-09-04 Valmet Fibertech Aktiebolag Device for spreading and distributing particles on a material web
CN1096348C (en) * 1997-02-24 2002-12-18 瑞典商顺智公司 Device for spreading and distributing particles on material web
WO2000000332A1 (en) * 1998-06-26 2000-01-06 Valmet Fibertech Ab Method for forming of a fiber mat
US6503425B1 (en) 1998-06-26 2003-01-07 Valmet Fibertech Ab Method for forming of a fiber mat
DE19909967C1 (en) * 1999-03-06 2000-06-08 Babcock Bsh Gmbh Plaster or plaster-fiberboard surface smoothing device, with tool shaft fitted with several material application elements

Also Published As

Publication number Publication date
US5855923A (en) 1999-01-05
DE69515185D1 (en) 2000-03-30
EP0794854B1 (en) 2000-02-23
ZA959837B (en) 1996-05-31
CA2206158C (en) 2005-03-29
CA2206158A1 (en) 1996-06-06
SE9404103D0 (en) 1994-11-28
NZ296615A (en) 1998-06-26
AU4126396A (en) 1996-06-19
AR000205A1 (en) 1997-05-21
ATE189872T1 (en) 2000-03-15
CN1171074A (en) 1998-01-21
DE69515185T2 (en) 2000-06-21
EP0794854A1 (en) 1997-09-17
ES2142501T3 (en) 2000-04-16
SE503676C2 (en) 1996-07-29
FI972234A (en) 1997-05-27
FI972234A0 (en) 1997-05-27
CN1077005C (en) 2002-01-02
SE9404103L (en) 1996-05-29
PT794854E (en) 2000-08-31

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