EP0109456B1 - Verfahren und Vorrichtung zum Vergleichmässigen der Dichteverteilung in einer Kunstholzplatte - Google Patents

Verfahren und Vorrichtung zum Vergleichmässigen der Dichteverteilung in einer Kunstholzplatte Download PDF

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Publication number
EP0109456B1
EP0109456B1 EP82110741A EP82110741A EP0109456B1 EP 0109456 B1 EP0109456 B1 EP 0109456B1 EP 82110741 A EP82110741 A EP 82110741A EP 82110741 A EP82110741 A EP 82110741A EP 0109456 B1 EP0109456 B1 EP 0109456B1
Authority
EP
European Patent Office
Prior art keywords
resp
silo
weight
artificial wood
passed
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
Application number
EP82110741A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0109456A1 (de
Inventor
Dieter Dr Ing. Arnold
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.)
Carl Schenck AG
Original Assignee
Carl Schenck 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 Carl Schenck AG filed Critical Carl Schenck AG
Priority to DE8282110741T priority Critical patent/DE3273054D1/de
Priority to EP82110741A priority patent/EP0109456B1/de
Priority to US06/549,455 priority patent/US4557882A/en
Priority to CA000441274A priority patent/CA1206083A/en
Priority to FI834187A priority patent/FI74646C/fi
Publication of EP0109456A1 publication Critical patent/EP0109456A1/de
Application granted granted Critical
Publication of EP0109456B1 publication Critical patent/EP0109456B1/de
Expired 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
    • 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
    • B27N3/146—Controlling mat weight distribution

Definitions

  • the invention relates to a method for equalizing the density distribution in synthetic wood panels made from glued bulk material and a device for carrying out the method for producing synthetic wood panels with a floor conveyor bunker with discharge, the discharge width of which is the same as the spreading width for synthetic wood panels to be produced and devices downstream of the floor conveyor bunker for bringing down the discharged Bulk goods as an endless fleece on a forming belt.
  • OE-C-22 14 900 which relates to a spreading device to compensate for different basis weights in the transverse direction of chip or fiber fleece or the like for the production of chipboard, fiberboard and the like, a device has become known in which a metering conveyor belt is used around from there to be able to throw off bulk material for a nonwoven to be built on a mold base.
  • the metering conveyor belt is infinitely variable and differently adjustable in height in the transverse direction.
  • Such additional devices are not suitable for uncovering and eliminating different basis weights in the transverse direction of chip or fiber nonwovens, that is to say of synthetic wood panels, already in the area of the formation of a bulk material veil. It is also not possible to determine the different density in the transverse direction on the metering conveyor belt.
  • the present invention is based on the object of proposing a method and a device for carrying out the method, detecting and eliminating density errors present in the bulk material as soon as it is discharged from a floor conveyor bunker and, if necessary, a density profile for a to specify the finished synthetic wood panel when the bulk material is discharged from a floor conveyor bunker.
  • This object is achieved with the characterizing features of method claim 1.).
  • the characterizing features of claim 3 with which a device for the production of synthetic wood panels is placed under protection, show how, through the inventive arrangement of a measuring surface above a guide surface which is arranged between the bunker outlet and the other descending devices for the bulk material, information about the current Density distribution over the molded cross-section to be obtained, which, in combination with a density distribution specified for the finished synthetic wood panel, determine a value that, as a rule, a separating device that extends over the entire bulk width is too widely scattered over the cross-section for the decrease in density difference in individual areas Bulk material affected.
  • a further inventive embodiment of the measuring surface is protected, in which the measuring surface itself is designed according to the invention as a narrow plate which can be moved back and forth across the entire bulk width in front of the guide surface.
  • An embodiment of this movable narrow plate is that the arrangement for transverse movement of the plate also extends outside the dump width, so that the entire device for maintenance and adjustment work can be removed from the dump area without interrupting the pouring process.
  • the characterizing features of claim 4) provide a device for carrying out the method under protection, in which, in addition to compensating for the density profile, which would lead to a slightly lighter finished synthetic wood panel, this slight change in the weight of the finished synthetic wood panel compared to the predetermined synthetic wood panel by increasing the discharge of bulk material by increasing the belt speed.
  • the characterizing features of claim 7) protect the inventive use of a scraper belt, which simultaneously serves as a discharge element, as a separating element and as a return transport element for the proportion of incorrectly discharged bulk material.
  • the outlet cross section of the floor belt hopper can also be provided with spiked rollers arranged one above the other, which extend over the entire width of the discharge cross section.
  • the discharge spiked roller closest to the floor conveyor then takes over the function of separating the excess material that has been poured and transporting it back into the floor conveyor bunker in conjunction with a trough conveyor which is designed as a spiral vibratory conveyor or screw conveyor.
  • inventive configurations for the attachment of the measuring surface as a narrow plate are protected, in which the guarantee is given that contamination of the movable parts for receiving the movable narrow plate are excluded and also Precautions are taken to ensure that the bulk material itself does not hinder the measuring surface in its measuring activity, for example by pinching the bulk material between the guiding surface and the measuring surface when moving the measuring surface across the guiding surface.
  • a pole-changing motor, to which control commands are applied, or a DC motor can be used according to the invention to change the speed of the belt.
  • a scraper belt 4 covers the outlet cross section of the floor belt hopper. The scraper belt 4 rotates in the direction of the arrow and, in cooperation with a rotating floor belt 5 which closes the floor belt bunker downwards and whose speed can be adjusted, takes a quantity of bulk material which can be preselected for the production of chipboard from the bulk material 6 stored on the end face.
  • This removed bulk material is fed to a scattering unit 7 and then brought down by this scattering unit 7 as a fleece 8 onto a forming belt 9.
  • the respective fleece weight is determined by a scale 11, whether as the total weight including the underlay or as a pure net nonwoven weight by subtracting the weight of the underlay .
  • a further spreader unit may be present in mirror image to the one shown while maintaining a floor conveyor bunker, or there may be two floor conveyor bunkers which feed the spreader units arranged in mirror image arrangement.
  • the scattering units shown which operate by means of the throwing principle
  • scattering units which, by means of a blower, bring about a spreading good for the production of a nonwoven.
  • mirror images can be arranged Blower outlet openings with a high throughput of fleece to be scattered, as known, can be used, and combinations between scattering units based on the throwing principle and scattering units based on the wind scattering principle, as known, can also be used.
  • a measuring surface 12 is arranged between the floor belt bunker and the spreading unit 7, which is explained in more detail in connection with FIGS. 2 and 3c.
  • This measuring surface indicates the weight distribution of the pouring stream 13 in accordance with the bulk flow 13 conducted over it across the width of the spread s (cf. FIG. 3d).
  • a controller 14 to which a setpoint 15, which contains the total weight of the finished chipboard with a uniform density distribution, is simultaneously fed. From the different weight information of the bulk flow 13, which is a measure of the different density distribution in the particle board, compared to the constant information from the target value 15, a control variable that changes over the scattering range is obtained and is fed to an actuator 16.
  • This actuator now acts on tongues 17 of a separating device 18 in such a way that the individual tongues 17 protrude more or less far into the bulk flow 13 according to the distribution (cf. FIG. 3d).
  • chips accumulate on the individual tongues, which are stripped from the tongues 17 with the aid of the scraper belt 4 and are returned to the feeder 2 of the floor belt bunker 1 via the returning run of the scraper belt 4. It has proven to be advantageous if a guide plate 19 is provided over the total spreading width in the region of the deflection of the scratch 4.
  • the last scraper roller also has a guide plate 19 as a partial sheathing, to which a trough conveyor (not shown) is connected for returning the material to be returned to the belt bunker 1.
  • the trough conveyor can be provided with a screw or can be designed as a vibratory conveyor. The arrangement of a guide plate 19 thus prevents return material from falling back into the bulk flow 13.
  • the measuring surface shown in Fig. 2 has a narrow plate 22 which is arranged on a lever 23.
  • the lever 23 is supported on the one hand on a cross spring joint 24 and on the other hand is supported on a support rod 26 via a force measuring device 25.
  • the support rod 26 is mounted in a transverse guide 27 which extends over the entire spread.
  • a threaded nut 28 is also fixedly arranged on the support rod 26, as a result of which the narrow plate 22 can be moved transversely to the bulk width in cooperation with a threaded rod 29.
  • the distance a is selected according to the invention such that when the narrow plate 22 is moved, no part of the bulk flow can get stuck between the guide surface 31 and the narrow plate 22, so that there is no fear of failure of the narrow plate.
  • the narrow plate still ends within the guide surface 31, so that the scattering unit 7 cannot be influenced by a non-uniform inflow of the bulk flow 13. Since the area b, in which the narrow plate 22 is currently located, ends so far above the end of the guide surface that this partial bulk flow 13 can unite again with the remaining bulk flow 13 and evenly from the end edge 32 of the guide surface 31 to Spreading unit 7 flows off.
  • the housing 30 also carries a baffle plate 33 which, together with the guide surface 31, forms a slot along which the narrow plate 22 can be moved.
  • tongues 17 protrude into the stray current 13 in order to remove excess material as described in FIG. 1 and to feed it back to the bottom belt bunker 1 together with the scratcher 4 or with a scraper roller.
  • FIG 3a shows tongues 17 standing in the bulk stream 13 and a baffle 19 within the angled scraper 34, which absorb the material picked up by the tongues 17 by moving along the inside of the baffle 19 and, due to their angular design, without returning, transport them back into the floor conveyor bunker.
  • FIG. 3b The configuration of the adjustment of a tongue 17 shown in FIG. 3b shows the tongue 17 in a roller bearing 35.
  • the tongue 17 has at its rear end 36 a threaded bore 37 which interacts with a threaded pin 38.
  • the set screw 38 is mounted in a guide 39 and is adjusted by an adjusting drive 40, in the simplest case as a drill chuck, on its threaded head 41 by turning the adjusting drive 40 to the right or left for its region of the pouring stream 13 into or out of the pouring stream .
  • the guide 39 can be supported as a cross-member extending to the left and right of the bulk width across the entire bulk width.
  • the adjustment drive 40 moves from tongue 17 to tongue 17 transversely to the stray current 13 and adjusts each individual tongue according to the information received from the controller.
  • the measuring surface 12 shown in Fig. 3c consists of a plurality of plates 42, the individual widths b, to b n are selected according to the requirements. If, for example, measurements in the finished particle board have determined that the greatest density fluctuations occur at the edge of this plate, it will be advisable to provide small widths b there.
  • the individual plates 42 are provided with strain gauges 43 and thus enable the measurement of the respective weight distribution over a certain partial width of the entire bulk width. This results in the weight distribution image shown in FIG. 3d over the scattering width s without a narrow plate having to be moved over the guide surface 31.
  • the tongues 17 are formed in their width corresponding to the plates 42, so that there is a direct connection between the measured instantaneous distribution and the quantity to be taken off.
EP82110741A 1982-11-20 1982-11-20 Verfahren und Vorrichtung zum Vergleichmässigen der Dichteverteilung in einer Kunstholzplatte Expired EP0109456B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8282110741T DE3273054D1 (en) 1982-11-20 1982-11-20 Method of and apparatus for equalizing the density distribution in an artificial-wood panel
EP82110741A EP0109456B1 (de) 1982-11-20 1982-11-20 Verfahren und Vorrichtung zum Vergleichmässigen der Dichteverteilung in einer Kunstholzplatte
US06/549,455 US4557882A (en) 1982-11-20 1983-11-07 Method and apparatus for equalizing the density distribution of pressed wood panels
CA000441274A CA1206083A (en) 1982-11-20 1983-11-16 Method and apparatus for equalizing the density distribution of pressed wood panels
FI834187A FI74646C (fi) 1982-11-20 1983-11-16 Foerfarande och anordning foer utjaemning av taethetsfoerdelningen i en traematerialplatta.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82110741A EP0109456B1 (de) 1982-11-20 1982-11-20 Verfahren und Vorrichtung zum Vergleichmässigen der Dichteverteilung in einer Kunstholzplatte

Publications (2)

Publication Number Publication Date
EP0109456A1 EP0109456A1 (de) 1984-05-30
EP0109456B1 true EP0109456B1 (de) 1986-09-03

Family

ID=8189352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82110741A Expired EP0109456B1 (de) 1982-11-20 1982-11-20 Verfahren und Vorrichtung zum Vergleichmässigen der Dichteverteilung in einer Kunstholzplatte

Country Status (5)

Country Link
US (1) US4557882A (fi)
EP (1) EP0109456B1 (fi)
CA (1) CA1206083A (fi)
DE (1) DE3273054D1 (fi)
FI (1) FI74646C (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006030122A1 (de) * 2006-06-28 2008-01-03 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Streugutanlage
DE102016117542A1 (de) 2016-09-16 2018-03-22 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum Rückstreifen von Streugut in einem Streudosierbunker und Streudosierbunker mit einer solchen Vorrichtung

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EP0230483B1 (de) * 1986-01-20 1990-03-28 Carl Schenck Ag Verfahren zum Vergleichmässigen von Streupartikeln sowie eine Vorrichtung zur Durchführung des Verfahrens
US5137590A (en) * 1986-05-12 1992-08-11 Catalana De Enfeltrados, S.A. "Catensa" Process for the fabrication of a composition formed by thermocompression
JPH0679811B2 (ja) * 1986-08-06 1994-10-12 トヨタ自動車株式会社 木質系成形体の製造方法
ATE58325T1 (de) * 1987-05-23 1990-11-15 Schenck Ag Carl Verfahren zum streuen eines spaenevlieses.
GB8729894D0 (en) * 1987-12-22 1988-02-03 Compak Syst Apparatus for laying matt of fibrous material
JP3144163B2 (ja) * 1992-07-20 2001-03-12 住友電気工業株式会社 粉体材料の定量供給装置及び粉体材料圧縮製品の製造方法
US5395564A (en) * 1993-11-15 1995-03-07 E. I. Du Pont De Nemours And Company Method for controlling throughput
NL9401394A (nl) * 1994-08-30 1996-04-01 Thermoform Bau Forschung Werkwijze en inrichting voor het doseren en verdelen van stortmateriaal, in het bijzonder voor de produktie van mineraalgebonden houtspaanplaten.
EP0800901B1 (de) * 1996-04-10 2003-07-02 Dieffenbacher Schenck Panel GmbH Verfahren zur Herstellung eines Vlieses und Vorrichtung
DE59608838D1 (de) * 1996-04-11 2002-04-11 Dieffenbacher Schenck Panel Verfahren zur kontinuierlichen Herstellung eines Vlieses für die Herstellung von Holzwerkstoff- oder ähnlichen Platten
US5740898A (en) * 1996-10-24 1998-04-21 Macmillan Bloedel Limited Method and apparatus for laying up strands
DE19916462A1 (de) * 1999-04-12 2000-10-19 Dieffenbacher Schenck Panel Formstation
SE519969C2 (sv) * 2001-09-10 2003-05-06 Metso Paper Inc Anordning och sätt för att forma en matta
DE102004033777A1 (de) * 2004-07-12 2006-02-02 Dieffenbacher Gmbh + Co. Kg Verfahren, Vorrichtung und Streukopf zur Streuung oder Schüttung von Partikeln
ITTV20070126A1 (it) 2007-07-16 2009-01-17 Luca Toncelli Procedimento ed apparecchiatura per la fabbricazione di lastre ad effet-to venato
DE102007050679A1 (de) 2007-10-21 2009-04-23 Voxeljet Technology Gmbh Verfahren und Vorrichtung zum Fördern von Partikelmaterial beim schichtweisen Aufbau von Modellen
DE102007063374A1 (de) * 2007-12-30 2009-07-02 Dieffenbacher Gmbh + Co. Kg Verfahren und Vorrichtung zur Vorwärmung einer Pressgutmatte im Zuge der Herstellung von Holzwerkstoffplatten
WO2009136750A2 (ko) * 2008-05-09 2009-11-12 한화엘앤씨 주식회사 인조목재 제조방법 및 그에 의해 제조된 인조목재
KR100973161B1 (ko) 2008-05-09 2010-07-30 한화엘앤씨 주식회사 인조목재
KR101008838B1 (ko) 2008-06-20 2011-01-19 한화엘앤씨 주식회사 인조목재 및 그 제조방법
IT1393456B1 (it) * 2009-03-10 2012-04-20 Toncelli Apparecchiatura e metodo per la fabbricazione di lastre ad effetto venato
DE102018112166A1 (de) * 2018-05-22 2019-11-28 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung und Verfahren zur Streuung eines Vlieses auf einem Formband

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006030122A1 (de) * 2006-06-28 2008-01-03 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Streugutanlage
DE102006030122B4 (de) * 2006-06-28 2008-05-21 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Streugutanlage
DE102016117542A1 (de) 2016-09-16 2018-03-22 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum Rückstreifen von Streugut in einem Streudosierbunker und Streudosierbunker mit einer solchen Vorrichtung

Also Published As

Publication number Publication date
EP0109456A1 (de) 1984-05-30
FI834187A0 (fi) 1983-11-16
FI834187A (fi) 1984-05-21
FI74646C (fi) 1988-03-10
DE3273054D1 (en) 1986-10-09
US4557882A (en) 1985-12-10
FI74646B (fi) 1987-11-30
CA1206083A (en) 1986-06-17

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