EP1018415B1 - Vertikal-Rührmaschine zur Herstellung von Spanplatten - Google Patents

Vertikal-Rührmaschine zur Herstellung von Spanplatten Download PDF

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Publication number
EP1018415B1
EP1018415B1 EP99124874A EP99124874A EP1018415B1 EP 1018415 B1 EP1018415 B1 EP 1018415B1 EP 99124874 A EP99124874 A EP 99124874A EP 99124874 A EP99124874 A EP 99124874A EP 1018415 B1 EP1018415 B1 EP 1018415B1
Authority
EP
European Patent Office
Prior art keywords
gluing machine
mixing chamber
mixing
aperture
screw
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
EP99124874A
Other languages
English (en)
French (fr)
Other versions
EP1018415A1 (de
Inventor
Luigi Frati
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.)
Costruzioni Meccaniche Pomponesco CMP SpA
Original Assignee
Costruzioni Meccaniche Pomponesco CMP 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 Costruzioni Meccaniche Pomponesco CMP SpA filed Critical Costruzioni Meccaniche Pomponesco CMP SpA
Publication of EP1018415A1 publication Critical patent/EP1018415A1/de
Application granted granted Critical
Publication of EP1018415B1 publication Critical patent/EP1018415B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0227—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer

Definitions

  • This invention relates to those gluing machines used in chipboard production plants to distribute a sufficient quantity of liquid glue throughout a mass of wood particles or chips to enable this mass to be transformed into chipboard panels by subsequent operations.
  • Traditional gluing machines comprise a normally cylindrical mixing chamber of substantially horizontal axis, into one end of which wood particles of the desired size are fed by gravity in a suitably metered quantity.
  • a predetermined quantity of liquid glue of thermosetting type is also fed into the chamber, usually by spraying.
  • the gluing machine also comprises means for mixing them together more or less intensely and for transferring the resultant mass, after a predetermined time, to an exit aperture through which this latter, called hereinafter the mixture, which is formed from wood particles wetted with glue, leaves.
  • Such a machine is known for example from EP-A-0,805,008.
  • the glue should be distributed uniformly over the surface of each particle, by applying to the surface of each particle a glue quantity which is proportional to its area. It has however been found that in known gluing machines this does not happen to the optimum degree. In this respect, in the resultant mixture the glue "wets" the particles of smaller size with greater uniformity. In any batch of wood particles, even if of rigorously controlled particle size distribution, there is a considerable variety of particle sizes, hence the glue distribution over the surface of the particles does not correspond to the said optimum.
  • Another solution used to improve glue distribution is to obstruct the outflow of the mixture from the mixing chamber of the gluing machine, which is equivalent to prolonging the wood particle retention time in the chamber, with the result of prolonging mixing with the glue.
  • This solution tends to increase mixing chamber filling, but only in the vicinity of its exit door.
  • the door setting is indicated in terms of percentage, with 0% corresponding to the door completely open and 100% to the door completely closed.
  • too high a door closure percentage cannot be used because this excessively increases mixture temperature, with consequent glue polymerization.
  • An object of this invention is to obviate the aforedescribed drawbacks of known gluing machines.
  • a further object is to provide a gluing machine which is of simple construction, reliable operation and easy maintenance and cleaning.
  • the gluing machine of the invention comprising a cylindrical mixing chamber in which a feed aperture, an exit aperture and a mixing member are provided, characterised in that the mixing chamber is positioned vertically, the feed aperture is provided in the lower part of the mixing chamber and the exit aperture (36) is provided in the upper part of the mixing chamber (12), means being provided to feed the wood particles into the mixing chamber via the feed aperture.
  • the means for feeding the wood particles into the mixing chamber preferably comprise a feeder screw.
  • a vertical screw is provided in the lower part of the mixing chamber.
  • the gluing machine 10 has a vertical cylindrical chamber 12 formed from two concentric cylindrical steel shells 14 and 16, spaced apart to form an interspace 18 the function of which is explained hereinafter.
  • the cylindrical chamber 12 has a feed aperture 20 which communicates with one end of a motorized feeder screw 22 enclosed in a relative cylindrical casing 24.
  • the screw 22 is substantially horizontal, although this is not essential.
  • an aperture 26 through which the wood particles are fed by gravity, these being thrust into the cylindrical chamber 12 by the action of the screw 22.
  • the lower part of the cylindrical chamber 12 contains a vertical motorized frusto-conical screw 28 coaxial with the chamber 12, its rotation upwardly urging the wood particles fed into the chamber 12 by the action of the feed screw 22.
  • a mixing member 30 consisting essentially of a coaxial motorized shaft 32 from which mixing arms 34 radially extend, these being indicated very schematically in the figure, but of conventional type.
  • the mixing arms 34 can have different shapes depending on the height at which they are positioned.
  • the mixing member 30 can be rigidly connected to the vertical screw 28 (so that both are driven by one and the same motor), this latter being keyed onto the shaft 32, which is rotatably supported at its ends by supports 42, 44. It is however apparent that the shaft of the mixing member and the vertical screw can be driven independently, even at different speeds, by relative motors.
  • the vertical screw can be of a shape different from frusto-conical (for example cylindrical).
  • an exit aperture 36 is provided close to the top of the cylindrical chamber 12.
  • radial "blades" 46 are provided on the shaft 32 to facilitate discharge of the mixture from the mixing chamber 12 through the exit aperture 36 by overflowing.
  • the side walls of the chamber 12 and the mixing member 30 are cooled in conventional manner to prevent the mixture, as a result of heating caused by remixing, from reaching a temperature which would cause the glue to polymerize, one result of which would be the rapid fouling of those parts of the gluing machine 10 which come into contact with the mixture.
  • a gate 38 which closes a relative aperture is provided in the bottom of the casing 24 of the feeder screw 22, in this specific case the gate 38 being operated by a conventional pneumatic device indicated overall by 40 in the figure.
  • the glue is injected into the interior of the mixing chamber 12 at various points distributed over various heights (as indicated schematically in the figure, in which three nozzles 48 located at different heights are visible, fed with liquid glue) in order to wet the wood particles with the glue in successive stages.
  • injecting the glue in successive stages enables the so-called particle "surfacing" effect to be obtained, by which glue absorption by the particles is reduced, with consequent reduction in the amount of glue required.
  • the mass of wood particles is fed by gravity through the aperture 26 provided in the casing 24 of the screw 22.
  • the wood particles are gradually urged towards the mixing chamber 12, then through the feed aperture 20 and into the bottom of the chamber 12, where they encounter the vertical screw 28 which when rotated urges them upwards.
  • the wood particles are struck in successive stages by jets of glue leaving the nozzles 48, and are simultaneously remixed by the mixing member 30.
  • the overall effect due to the action of the mixing member 30 and the vertical screw 28 is a combined horizontal and vertical remixing enabling optimum results to be obtained, ie a very uniform glue coating on the wood particle surface.
  • the mixture of wood particles and glue finally leaves from the exit aperture 36 by overflow aided by the action of the blades 46.
  • the gluing machine is cooled by circulating a cooling fluid, such as water, through the interspace 18 between the cylindrical shells 14 and 16. Cavities (not shown) are also provided in the mixing member 30 for circulation of a cooling fluid.
  • a cooling fluid such as water
  • the peripheral speed of the mixing member 30 can be maintained at around 7-10 m/s, enabling the wood particle size distribution to be maintained while at the same time achieving a decidedly higher particle/glue mixture retention time within the mixing chamber 12, of the order of 60-70 seconds, compared with known gluing machines.
  • Such a high retention time would be counter-productive in a traditional gluing machine in which the mixing speed is much higher (14-17 m/s). The particle temperature would in fact rise with consequent pre-polymerization of the glue.
  • the gluing machine of the invention has a rather simple structure, and is therefore easy to construct. As no fouling occurs on those parts which come into contact with the mixture of wood particles and glue, maintenance and cleaning are much simpler than in known gluing machines. In addition, as the installed power requirement is less, such a gluing machine consumes significantly lesser energy than known gluing machines, besides being of much smaller overall plan dimensions.
  • a further advantage of the gluing machine of the invention is that as it extends vertically and has its mixture exit aperture at the top (ie at a much greater height than in known gluing machines), some of the mechanical conveyors (not shown) required to transfer the-mixture from the exit 36 of the gluing machine to a panel forming machine (not shown) can be eliminated, this latter being located in the relative plant at a much higher level than with known gluing machines. Shortening the conveyor transfer path reduces transfer time and hence the tendency of the glue contained in the mixture to polymerize.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)
  • Cultivation Of Plants (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Panels For Use In Building Construction (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Treatment Of Sludge (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Seal Device For Vehicle (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Catching Or Destruction (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Claims (12)

  1. Klebemaschine (10) für Spanplatten-Fertigungsbetriebe, mit einer zylindrischen Mischkammer (12), in der eine Zufuhröffnung (20), eine Ausgangsöffnung (36) und ein Mischelement (30) vorgesehen sind,
    dadurch gekennzeichnet, dass die Mischkammer (12) vertikal angeordnet ist, die Zuführöffnung (20) im unteren Teil der Mischkammer (12) vorgesehen ist und die Ausgangsöffnung (36) im oberen Teil der Mischkammer (12) vorgesehen ist, wobei eine Vorrichtung (22) zum Zuführen der Holzteilchen in die Mischkammer (12) über die Zuführöffnung (20) vorgesehen ist.
  2. Klebemaschine (10) nach Anspruch 1, wobei das Mischelement (30) eine motorbetriebene, vertikale Welle (32) aufweist, die koaxial zu der Mischkammer (12) angeordnet ist, wobei Mischarme (34) radial von der Welle ausgehen.
  3. Klebemaschine (10) nach Anspruch 1, wobei die Vorrichtung zum Zuführen der Holzteilchen in die Mischkammer (12) eine motorbetriebene Förderschnecke (22) aufweist.
  4. Klebemaschine (10) nach Anspruch 1, wobei eine motorbetriebene, vertikale Schnecke (28) im unteren Teil der Mischkammer (12) vorgesehen ist, um die durch die Zuführöffnung (20) zugeführten Holzteilchen nach oben zu treiben.
  5. Klebemaschine (10) nach den Ansprüchen 2 und 4, wobei die vertikale Schnecke (28) kegelstumpfförmig ist und sich nach oben verjüngt.
  6. Klebemaschine (10) nach den Ansprüchen 2 und 4, wobei die vertikale Schnecke (28) mit der Welle (32) des Mischelements (30) verkeilt ist.
  7. Klebemaschine (10) nach Anspruch 2, wobei von der Welle (32) des Mischelements (30) radiale Blätter in Zuordnung zu der Ausgangsöffnung (36) ausgehen, um die Ausgabe des Gemischs beim Überlaufen zu erleichtern.
  8. Klebemaschine (10) nach Anspruch 1, wobei die Seitenwand der Mischkammer (12) aus zwei koaxialen Zylinderschalen (14, 16) gebildet ist, die voneinander beabstandet sind, um einen Zwischenraum (18) zu bilden, durch den ein Kühlfluid zirkulieren kann.
  9. Klebemaschine (10) nach Anspruch 1, wobei eine Vorrichtung zum Kühlen des Mischelements (30) vorgesehen ist.
  10. Klebemaschine (10) nach Anspruch 1, wobei das Gehäuse (24) der Förderschnecke (22) eine verschließbare untere Öffnung (38) aufweist.
  11. Klebemaschine (10) nach Anspruch 10, wobei die verschließbare untere Öffnung in dem Gehäuse (24) der Schnecke (22) durch eine Klappe (38) verschlossen wird, die durch eine pneumatische Vorrichtung (40) betrieben wird.
  12. Klebemaschine (10) nach Anspruch 2, wobei das Mischelement (30) eine Umfangsgeschwindigkeit zwischen 7 und 10 m/s besitzt.
EP99124874A 1999-01-07 1999-12-16 Vertikal-Rührmaschine zur Herstellung von Spanplatten Expired - Lifetime EP1018415B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999MI000014A IT1306923B1 (it) 1999-01-07 1999-01-07 Incollatrice verticale per impianti per la produzione di pannellitruciolari
ITMI990014 1999-01-07

Publications (2)

Publication Number Publication Date
EP1018415A1 EP1018415A1 (de) 2000-07-12
EP1018415B1 true EP1018415B1 (de) 2002-09-11

Family

ID=11381416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99124874A Expired - Lifetime EP1018415B1 (de) 1999-01-07 1999-12-16 Vertikal-Rührmaschine zur Herstellung von Spanplatten

Country Status (13)

Country Link
EP (1) EP1018415B1 (de)
AT (1) ATE223790T1 (de)
BR (1) BR0000017A (de)
CA (1) CA2293855A1 (de)
DE (1) DE69902869T2 (de)
ES (1) ES2179588T3 (de)
HR (1) HRP20000016A2 (de)
HU (1) HU219843B (de)
IT (1) IT1306923B1 (de)
NO (1) NO20000064L (de)
PL (1) PL190213B1 (de)
PT (1) PT1018415E (de)
TR (1) TR200000068A2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103612045B (zh) * 2013-12-09 2015-04-29 上海微松工业自动化有限公司 基板植球机助焊剂供给机构
CN108127763B (zh) * 2017-12-22 2020-05-08 中南林业科技大学 一种重组竹浸胶自动化成套设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3049555C2 (de) * 1980-12-31 1987-03-12 Rudolf Dr.-Ing. 4790 Paderborn Lödige Verfahren zum Benetzen flächiger Trägerteilchen und Vorrichtung hierzu
IT1282399B1 (it) * 1996-05-02 1998-03-20 Cmp Spa Unita'incollatrice per impianti di produzione di pannelli a base di legno,nonche' impianto utilizzante tale unita' incollatrice
DE19617660C2 (de) * 1996-05-03 1998-05-07 Rettenmaier & Soehne Gmbh & Co Mischsilo

Also Published As

Publication number Publication date
PL190213B1 (pl) 2005-11-30
EP1018415A1 (de) 2000-07-12
DE69902869T2 (de) 2003-01-16
HU0000025D0 (en) 2000-03-28
TR200000068A3 (tr) 2000-08-21
PT1018415E (pt) 2002-12-31
IT1306923B1 (it) 2001-10-11
ES2179588T3 (es) 2003-01-16
BR0000017A (pt) 2001-02-06
TR200000068A2 (tr) 2000-08-21
CA2293855A1 (en) 2000-07-07
HU219843B (hu) 2001-08-28
HUP0000025A3 (en) 2000-12-28
HRP20000016A2 (en) 2001-06-30
HUP0000025A2 (hu) 2000-10-28
ATE223790T1 (de) 2002-09-15
NO20000064D0 (no) 2000-01-06
ITMI990014A1 (it) 2000-07-07
DE69902869D1 (de) 2002-10-17
NO20000064L (no) 2000-07-10
PL337750A1 (en) 2000-07-17

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