EP0161323A1 - Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une couche de fibres - Google Patents

Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une couche de fibres Download PDF

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Publication number
EP0161323A1
EP0161323A1 EP84104310A EP84104310A EP0161323A1 EP 0161323 A1 EP0161323 A1 EP 0161323A1 EP 84104310 A EP84104310 A EP 84104310A EP 84104310 A EP84104310 A EP 84104310A EP 0161323 A1 EP0161323 A1 EP 0161323A1
Authority
EP
European Patent Office
Prior art keywords
fleece
basis weight
adjustable
segments
width
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.)
Withdrawn
Application number
EP84104310A
Other languages
German (de)
English (en)
Inventor
Wolfgang Dipl.-Holzwirt Heller
Peter Rückert
Dieter Wiemann
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.)
Bison Werke Baehre and Greten GmbH and Co KG
Original Assignee
Bison Werke Baehre and Greten GmbH and Co KG
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 Bison Werke Baehre and Greten GmbH and Co KG filed Critical Bison Werke Baehre and Greten GmbH and Co KG
Priority to EP84104310A priority Critical patent/EP0161323A1/fr
Priority to CA000478269A priority patent/CA1236813A/fr
Priority to SU853874310A priority patent/SU1475489A3/ru
Priority to US06/720,254 priority patent/US4636159A/en
Priority to NO851493A priority patent/NO851493L/no
Priority to FI851495A priority patent/FI76016C/fi
Publication of EP0161323A1 publication Critical patent/EP0161323A1/fr
Withdrawn legal-status Critical Current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 achieving a predeterminable basis weight distribution in the transverse direction of a fleece formed on a moving support from lignocellulosic and / or cellulosic particles mixed with at least one binder, such as chips, fibers or the like for the production of chip, fiber and the like Plates. Furthermore, the invention is directed to an apparatus for performing this method.
  • a spreading device to compensate for different basis weights in the transverse direction of chip or fiber nonwovens or the like for the production of chipboard, fiberboard and the like in which above a metering conveyor belt a stripping roller or the like for sprinkled on the metering conveyor belt Chips, fibers and the like is provided.
  • the gap width between the metering conveyor belt and the stripping roller can be adjusted to compensate for different grammages in the transverse direction of the fleece in that the metering conveyor belt is infinitely adjustable and its height can be adjusted differently in the transverse direction.
  • the object of the invention is to design a method of the type defined at the outset in such a way that the basis weight distribution in the transverse direction of a nonwoven can be specified very precisely, and fluctuations in the raw material composition and fluctuations in the chip geometry can be immediately compensated for in order to maintain a desired basis weight distribution and a change from one fleece thickness to another fleece thickness can be carried out without problems.
  • the structure of the device for carrying out the method according to the invention is intended to be particularly simple and easy to operate and be reliable and are also suitable for retrofitting in existing systems.
  • the part of the task relating to the method is achieved according to the invention in that the thickness of the entire nonwoven or, in the case of a nonwoven having a multi-layer structure, at least one of the nonwoven layers depending on a desired basis weight distribution over the width of the nonwoven, at least in regions, by mechanical intervention over the width of the nonwoven is changed.
  • the mechanical intervention is preferably carried out after the middle layer scattering and before the upper cover layer scattering, because at this point such a mechanical or pneumatic contact of the nonwoven is possible which does not adversely affect the surface character of the finished plate.
  • the material removed from the fleece during the mechanical intervention is preferably returned, for example, via a screw conveyor or pneumatically into the upstream metering bunker.
  • several directly adjoining correction sections are formed in the transverse direction of the fleece, with the gap between the base supporting the fleece and a stripping device being changed in each correction section as a function of a basis weight measurement carried out for the respective section, which advantageously takes place immediately before and / or is carried out after the mechanical correction intervention.
  • the respective weight per unit area of which can be specified very precisely owing to the influence of a wiping member assigned to the specific area, and the elimination of mutual influences of adjacent areas enables a very differentiated volume profile in the transverse direction of the Achieve fleece.
  • the basis weight correction in the pre-web formation has the considerable advantage that the corrections to be carried out in the subsequent web formation are minimized and, accordingly, the amount of the material to be returned is also small.
  • the middle layer is preferably scattered with an excess of material which is greater than the maximum negative scattering error to be expected in each correction section. If the preliminary fleece is corrected, the excess material to be used in the middle layer scattering can again be minimized, which is also the result of the advantageous interaction of the corrective measures in the preliminary fleece formation and in the final fleece formation.
  • a preferred device for carrying out the method according to the invention is characterized in that in the area between a middle layer and a top layer scattering station, a backscattering device designed as a scraper rake or in the form of endless belts 12 is provided with a plurality of adjacent and vertically adjustable segments , and that the adjustment of the segments of this stripping device is controlled as a function of the - nominal basis weight distribution in the transverse direction of the fleece.
  • At least one traversing measuring device is assigned to the rear stripping device, which consists of vertically adjustable segments, the instantaneous position of the segments being controlled as a function of the measured values supplied by this measuring device.
  • the measuring device can work, for example, with gamma rays or on an optical basis with reflection light analysis. If several measurements are carried out for each section, the correction is carried out as a function of the mean value formed section by section, the accuracy of the correction system increasing with the number of measurements. Taking into account the function and the investment costs, the measuring device is preferably installed in the form of a traversing measuring device behind the correction device, and as close to the correction device as possible.
  • the individual adjacent scraper rake segments can consist, for example, of known, two-armed computing elements or of endless belts fitted with drivers, in the latter case all adjacent endless belts being guided on the one hand by a common drive roller and on the other hand by a height-adjustable deflection roller.
  • the rotating back rake comprises a plurality of rake elements which are arranged next to one another and are adjustable in length, in particular telescopically extendable, wherein in each case a plurality of adjacent rake elements form a segment with elements which can be adjusted in length.
  • a rear stripping device 10 Arranged between sections 24 and 25 is a rear stripping device 10, which is divided in sections in the transverse direction, the individual sections lying next to one another in the transverse direction being able to be adjusted both jointly and individually in terms of their distance from the fleece carrier 22, as is indicated by the double arrow.
  • a preferably traversing measuring device 6 Located upstream of the stripping device 10 is a preferably traversing measuring device 6.
  • the stripping device 10 works together with a device 26 for returning the material stripped back from the device 10.
  • the stripping device 10 consists of a plurality of endless belts 12 which directly adjoin one another in the transverse direction of the fleece carrier 22 and which are provided with drivers 13 on their outside.
  • strip-shaped endless belts 12 which together form the device 10, are guided over a common drive roller 15 and each with its own deflection roller 16.
  • the deflection rollers 16 can be adjusted both together and individually in terms of their distance from the fleece carrier 22, as is indicated by the arrow 9.
  • the distance between the drive roller 15 and the fleece carrier 22 is always significantly greater than the respective distance of the individual deflection rollers 16 from the fleece carrier 22, so that the stripping effect required to compensate for fluctuations in the basis weight can always be guaranteed and, after the stripping device, a fleece consisting of a lower cover layer and middle layer 23 is present with the desired basis weight distribution, which is no longer distorted in any way by the subsequent spreading of the cover layer.
  • a measuring device 6 for determining the weight per unit area is assigned to the stripping device 10 and is arranged on a traverse so that it can be moved transversely to the fleece 23 in the direction of arrow 7 and thereby determines the weight per unit area transversely to the direction of movement of the fleece.
  • This measuring device 6 is connected downstream of the stripping device 10 in FIG. 2, but is preferably arranged directly in front of the stripping device 10.
  • FIG. 2 an adjustment in the sense of a is shown for one of the adjacent sections of the stripping device 10 Enlargement of the gap between fleece carrier 22 and corresponding roll 16 indicated.
  • the consequence of such an adjustment is that the corresponding section of the fleece 23 - as also indicated by dashed lines - has a greater height or thickness over the width of the corresponding section.
  • FIG. 3 shows, for example, four adjoining sections 11 of the stripping device 10, as shown in a side view in FIG. 2.
  • Each section has, for example, a width of approximately 100 mm, which also corresponds to the width of the respective deflection roller 16 with the associated endless belt 12, which is occupied by drivers 13.
  • the deflection rollers 16 are preferably provided with a circumferential notch in which a corresponding attachment of the endless belt 12 engages and thus ensures that an absolute straight running of the respective belt is ensured.
  • the deflection rollers 16 can be adjusted in the direction of the arrows 9 relative to the fleece carrier 22, as a result of which the amount discharged over the respective segment width is increased or decreased. This is indicated in FIG. 3 by the offset of the endless belts 12 which define the various segments 11.
  • the discharge volume can also be changed over the entire effective width by simultaneously adjusting all deflection rollers 16, which corresponds to a kind of basic adjustment.
  • the rotational movement between the individual deflection rollers 16 is transmitted by special couplings which are installed between the rollers 16 and allow a large axis offset.
  • the profiling of the preliminary web in the transverse direction shown in detail in FIG. 3 corresponds, for example, to a constant weight per unit area taking into account a different volume resulting from chip material of different density.
  • FIG. 4 shows an embodiment variant of a device according to the invention, in which the same parts are provided with the same reference numerals as in FIGS. 1 to 3.
  • the stripping device 10 is designed in the manner of a conventional stripping rake with a plurality of two-armed computing elements 17 arranged next to one another. In each case several adjacent, two-armed computing elements 17 form a segment 11 in the sense of the illustration according to FIG. 3.
  • the embodiment follows Fig. 4 with a fixed axis of rotation of the metering rake 10, a change in the active circuit 20 in the respective segment section by changing the radial length of the computing elements 17, which are telescopic and can be actuated via an adjusting device 18.
  • the computing elements 17 are held in two concentrically arranged hollow tubes 19, in which the adjusting devices 18 are mounted.
  • each segment can be set to a different gap width with respect to the fleece carrier 22, as a result of which the volume becomes different and can thus be selected that there is again a constant basis weight in the transverse direction of the fleece 23.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Nonwoven Fabrics (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Paper (AREA)
EP84104310A 1984-04-16 1984-04-16 Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une couche de fibres Withdrawn EP0161323A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP84104310A EP0161323A1 (fr) 1984-04-16 1984-04-16 Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une couche de fibres
CA000478269A CA1236813A (fr) 1984-04-16 1985-04-03 Methode et dispositif pour en venir a l'uniformite predeterminable du volume massique en sens transverse d'une precouche ou d'une couche
SU853874310A SU1475489A3 (ru) 1984-04-16 1985-04-03 Устройство дл получени заготовки ковра и/или ковра с заданным распределением веса на единицу площади в поперечном направлении
US06/720,254 US4636159A (en) 1984-04-16 1985-04-05 Apparatus for obtaining a predeterminable distribution of weight in the transverse direction of a pre-mat and/or mat
NO851493A NO851493L (no) 1984-04-16 1985-04-15 Fremgangsmaate og innretning for aa oppnaa en forutbestembar vektfordeling i tverretningen av en formatte og/eller matte
FI851495A FI76016C (fi) 1984-04-16 1985-04-15 Foerfarande och anordning foer aostadkommande av en pao foerhand bestaemd viktfoerdelning i tvaerriktningen av en foermatta och/eller matta.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84104310A EP0161323A1 (fr) 1984-04-16 1984-04-16 Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une couche de fibres

Publications (1)

Publication Number Publication Date
EP0161323A1 true EP0161323A1 (fr) 1985-11-21

Family

ID=8191880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104310A Withdrawn EP0161323A1 (fr) 1984-04-16 1984-04-16 Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une couche de fibres

Country Status (2)

Country Link
EP (1) EP0161323A1 (fr)
SU (1) SU1475489A3 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0392593A2 (fr) * 1989-04-12 1990-10-17 Iberditan, S.L. Dispositif pour la correction automatique de l'homogénéité du pressage dans la fabrication de tuiles
DE19503407A1 (de) * 1995-02-02 1996-08-08 Baehre & Greten Vorrichtung zur Vergleichmäßigung der Flächengewichtsverteilung von Vliesen
WO2000061341A1 (fr) * 1999-04-12 2000-10-19 Dieffenbacher Schenck Panel Gmbh Poste de dispersion pour panneaux de fibres
EP2535158A1 (fr) * 2011-06-17 2012-12-19 Binos Gmbh Agencement de boulons Scalper pour la mise de niveau de quantités de marchandises se trouvant sur une bande de transport, notamment quantités de marchandises en bois
EP2695983A1 (fr) * 2012-08-06 2014-02-12 Oskar Dilo Maschinenfabrik KG Dispositif et procédé de formation d'un non-tissé profilé ou homogénéisé ou d'un tapis en bourre de fibres profilé ou homogénéisé
DE102013002259A1 (de) 2013-02-12 2014-08-14 Fagus-Grecon Greten Gmbh & Co. Kg Verfahren und Anlage zur Herstellung von Werkstoffpartikelplatten
DE102011014209B4 (de) * 2010-03-18 2016-07-28 Fagus-Grecon Greten Gmbh & Co. Kg Scalperwalzen-Anordnung zum Nivellieren von auf einem Förderband aufliegenden Schüttgutmengen, insbesondere Holzschüttgutmengen
WO2017216725A1 (fr) 2016-06-13 2017-12-21 Sacmi Cooperativa Meccanici Imola Società Cooperativa Machine et procédé de compactage de poudre céramique
WO2018215405A1 (fr) * 2017-05-22 2018-11-29 Dieffenbacher GmbH Maschinen- und Anlagenbau Dispositif et procédé servant à fabriquer un tapis et installation de fabrication de panneaux de matériau

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822024A (en) * 1956-01-16 1958-02-04 Allwood Inc Apparatus for manufacturing wood particle boards
DE1528236A1 (de) * 1966-03-09 1970-05-14 Baehre Metallwerk Kg Verfahren und Vorrichtung zur Dosierung der Gutaufgabe an Streumaschinen
DE2214900A1 (de) * 1972-03-27 1973-10-18 Steiner Klaus Verfahren und vorrichtung zum verteilen von holzspaenen, fasern od. dgl. auf einer formunterlage zur herstellung von holzspanplatten, faserplatten od. dgl
DE7515958U (de) * 1975-05-20 1975-12-04 Baehre Und Greten Gmbh Vorrichtung zum dosieren von mit bindemitteln zu versehenden lignozellulosehaltigen teilchen wie holzspaenen o. dgl
DE2557352C3 (de) * 1975-12-19 1979-11-29 Carl Schenck Ag, 6100 Darmstadt Durchlaufverfahren zum kontinuierlichen Streuen eines gewichtskontrollierten Vlieses
EP0069162A1 (fr) * 1981-07-04 1983-01-12 Carl Schenck Ag Procédé et dispositif pour contrôler la répartition de densité dans une nappe de particules dispersée

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2822024A (en) * 1956-01-16 1958-02-04 Allwood Inc Apparatus for manufacturing wood particle boards
DE1528236A1 (de) * 1966-03-09 1970-05-14 Baehre Metallwerk Kg Verfahren und Vorrichtung zur Dosierung der Gutaufgabe an Streumaschinen
DE2214900A1 (de) * 1972-03-27 1973-10-18 Steiner Klaus Verfahren und vorrichtung zum verteilen von holzspaenen, fasern od. dgl. auf einer formunterlage zur herstellung von holzspanplatten, faserplatten od. dgl
DE7515958U (de) * 1975-05-20 1975-12-04 Baehre Und Greten Gmbh Vorrichtung zum dosieren von mit bindemitteln zu versehenden lignozellulosehaltigen teilchen wie holzspaenen o. dgl
DE2557352C3 (de) * 1975-12-19 1979-11-29 Carl Schenck Ag, 6100 Darmstadt Durchlaufverfahren zum kontinuierlichen Streuen eines gewichtskontrollierten Vlieses
EP0069162A1 (fr) * 1981-07-04 1983-01-12 Carl Schenck Ag Procédé et dispositif pour contrôler la répartition de densité dans une nappe de particules dispersée

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0392593A2 (fr) * 1989-04-12 1990-10-17 Iberditan, S.L. Dispositif pour la correction automatique de l'homogénéité du pressage dans la fabrication de tuiles
EP0392593A3 (fr) * 1989-04-12 1991-09-18 Iberditan, S.L. Dispositif pour la correction automatique de l'homogénéité du pressage dans la fabrication de tuiles
DE19503407A1 (de) * 1995-02-02 1996-08-08 Baehre & Greten Vorrichtung zur Vergleichmäßigung der Flächengewichtsverteilung von Vliesen
DE19503407C2 (de) * 1995-02-02 1999-07-01 Kvaerner Panel Sys Gmbh Vorrichtung zur Vergleichmäßigung der Flächengewichtsverteilung von Vliesen
WO2000061341A1 (fr) * 1999-04-12 2000-10-19 Dieffenbacher Schenck Panel Gmbh Poste de dispersion pour panneaux de fibres
DE102011014209B4 (de) * 2010-03-18 2016-07-28 Fagus-Grecon Greten Gmbh & Co. Kg Scalperwalzen-Anordnung zum Nivellieren von auf einem Förderband aufliegenden Schüttgutmengen, insbesondere Holzschüttgutmengen
EP2535158A1 (fr) * 2011-06-17 2012-12-19 Binos Gmbh Agencement de boulons Scalper pour la mise de niveau de quantités de marchandises se trouvant sur une bande de transport, notamment quantités de marchandises en bois
EP2695983A1 (fr) * 2012-08-06 2014-02-12 Oskar Dilo Maschinenfabrik KG Dispositif et procédé de formation d'un non-tissé profilé ou homogénéisé ou d'un tapis en bourre de fibres profilé ou homogénéisé
US9003609B2 (en) 2012-08-06 2015-04-14 Oskar Dilo Maschinenfabrik Kg Device and method for forming a uniform or profiled fleece or a uniform or profiled fiber flock mat
DE102013002259A1 (de) 2013-02-12 2014-08-14 Fagus-Grecon Greten Gmbh & Co. Kg Verfahren und Anlage zur Herstellung von Werkstoffpartikelplatten
DE102013002259B4 (de) * 2013-02-12 2016-11-03 Fagus-Grecon Greten Gmbh & Co. Kg Verfahren und Anlage zur Herstellung von Werkstoffpartikelplatten
WO2017216725A1 (fr) 2016-06-13 2017-12-21 Sacmi Cooperativa Meccanici Imola Società Cooperativa Machine et procédé de compactage de poudre céramique
US11084184B2 (en) 2016-06-13 2021-08-10 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Machine and method for compacting ceramic powder
WO2018215405A1 (fr) * 2017-05-22 2018-11-29 Dieffenbacher GmbH Maschinen- und Anlagenbau Dispositif et procédé servant à fabriquer un tapis et installation de fabrication de panneaux de matériau

Also Published As

Publication number Publication date
SU1475489A3 (ru) 1989-04-23

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: RUECKERT, PETER

Inventor name: HELLER, WOLFGANG, DIPL.-HOLZWIRT

Inventor name: WIEMANN, DIETER