EP3250352A2 - Dispositif et procédé d'encollage de particules - Google Patents

Dispositif et procédé d'encollage de particules

Info

Publication number
EP3250352A2
EP3250352A2 EP16700268.2A EP16700268A EP3250352A2 EP 3250352 A2 EP3250352 A2 EP 3250352A2 EP 16700268 A EP16700268 A EP 16700268A EP 3250352 A2 EP3250352 A2 EP 3250352A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
binder
outlet
particle
main flow
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Withdrawn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
EP16700268.2A
Other languages
German (de)
English (en)
Inventor
Udo Gehrer
Johannes Hicker
Roland Hicker
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.)
Brav-O-Tech GmbH
Original Assignee
Brav-O-Tech GmbH
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 Brav-O-Tech GmbH filed Critical Brav-O-Tech GmbH
Publication of EP3250352A2 publication Critical patent/EP3250352A2/fr
Withdrawn legal-status Critical Current

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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0263—Mixing the material with binding agent by spraying the agent on the falling material, e.g. with the material sliding along an inclined surface, using rotating elements or nozzles
    • 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
    • B27N1/029—Feeding; Proportioning; Controlling
    • 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
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles

Definitions

  • the present invention relates to a device for enclosing particles, in particular wood particles, such as wood fibers, with a dryer and with a particle stream transporting line through the outlet of the particle flow is introduced in a main flow direction in the dryer, wherein binder is fed to the particle flow ,
  • Such devices are known from the fiber, MDF, HDF, wood-based or plastic plate production.
  • the particle stream is formed from a mixture of the particles with steam and introduced into the dryer via the line transporting the particle stream, the so-called blowline.
  • DE 10 2008 063 914 A1 discloses such a device in which the binder is already supplied to the particle stream in the line transporting the particle stream.
  • DE 10 2006 026 124 AI and WO 2009/116877 AI disclose embodiments in which the binder is fed directly to the outlet of the blowline.
  • the outlet of the blowline forms a kind of mixing nozzle, in which the particles are mixed with the binder supplied to the nozzle.
  • DE 41 22 842 A1 discloses a device in which the binder is sprayed via a nozzle onto the emerging from an outlet of the blowline particle flow.
  • the binder is supplied in the main flow direction of the particle stream, wherein the difficulty is to achieve an advantageous distribution of the binder in the supply to the particle flow.
  • An early supply of binder in the particle flow causes any changes in the direction of the particle stream transporting lines can lead to adhesion to the pipe walls, which can cause the pipes to grow.
  • the invention is defined by the features of claim 1 and claim 9.
  • the apparatus according to the invention for the addition of particles, in particular wood particles such as wood fibers, with a dryer and with a particle stream transporting line, through the outlet of the particle flow is introduced in a main flow direction in the dryer, and wherein binder is fed to the particle flow is provided that the binder is introduced via a nozzle device with a directed against the main flow direction velocity component.
  • the invention provides that the binder is introduced via the nozzle device in the particle flow such that the binder directed against the main flow direction Speed component has.
  • the nozzle device is thus contrary directed in the main flow direction and extends, for example, at an obtuse angle to the main flow direction.
  • such a supply of the binder for the distribution of the binder is particularly advantageous, since the particle flow, which consists of the particles and steam, is passed through the conduit at a high speed and strikes the introduced binder.
  • the binder can be supplied in particular unatomized. This results in a collision of the particle flow with the introduced binder, whereby the binder is atomized fan-like.
  • the fact that the binder is introduced with a velocity component directed counter to the main flow direction causes the entrainment of the binder during atomization to have a curved course in which it is fanned out. This results in a particularly advantageous distribution of the binder, wherein the binder penetrates relatively deep into the particle flow at the same time.
  • the nozzle device has at least one jet-forming nozzle.
  • the nozzle of the nozzle device is not a nebulizing nozzle but forms a binder jet.
  • This has the advantage that when the particle stream strikes the binder, it is first atomized, with the impinging particle stream being removed from outer regions which are arranged on the side of the jet facing the particle stream. This ensures that the binder jet can penetrate very far into the particle flow, so that an advantageous distribution of the binder into the particle flow can be achieved.
  • a jet-forming nozzle is also of simple construction, so that it is possible to dispense with complicated nozzle geometries, as provided in the prior art.
  • a jet-forming nozzle is more favorable in terms of energy compared to a nebulizing nozzle.
  • the nozzle device has two or three jet-forming nozzles, which are arranged parallel to each other.
  • three liquid jets of binder can be produced, which are distributed over the width of the particle stream.
  • the jet-forming nozzles are arranged in a row and have the same distance from each other.
  • the nozzle directions of the two or three jet-forming nozzles are not parallel to each other, but at an angle to each other.
  • a first central nozzle may be aligned with the center line of the particle stream, whereas the other two nozzles are each arranged at the same angle to the central nozzle.
  • three nozzles can be arranged in one plane. Due to the angled arrangement, an improved distribution of the binder in the particle stream can be achieved because the binder is very widely distributed in the introduction into the particle flow, at the same time the nozzle device has relatively small dimensions.
  • the at least one jet-forming nozzle of the nozzle device has an elongate cross section, for example an elliptical cross section.
  • a binder beam can be formed with a corresponding cross-section.
  • the orientation of such a nozzle may be transverse to the main flow direction, so that the binder jet has a wider extension, which is transverse to the main flow direction or with the main flow direction, so that the wider side of the binder jet in the main flow direction.
  • the orientation of the nozzle across the Main flow direction may be advantageous because then the binder jet has a relatively wide extent transverse to the nozzle direction, so that an advantageous distribution in a direction transverse to the nozzle direction in the particle flow can be achieved.
  • the orientation of the nozzle with the wider extent in the main flow direction has the particular advantage that the attack surface formed between the particle flow and the binder jet to the binder jet is relatively small compared to the strength of the binder jet, so that at least a portion of the binder beam over a long distance remains in the particle stream in the form of a jet before a complete atomization of the binder has occurred.
  • the binder jet can penetrate very deeply into the particle stream, which results in a particularly advantageous distribution.
  • some or all of the nozzles may have such a nozzle shape.
  • the nozzle device is arranged in the main flow direction behind the outlet.
  • the binder is introduced counter to the main flow direction in the region of the particle flow in which an expansion of the particle flow already takes place. It has been found that in the conduit carrying the particle stream the pressure decreases towards the outlet. Furthermore, evaporation of residual moisture takes place in the particle stream. The pressure relief and evaporation increase the velocity of the particle flow to the outlet of the conduit and thus exit the conduit at high velocity.
  • the binder can thus be introduced into a region of the particle stream in which it has a very high velocity, whereby the binder is atomized in a particularly advantageous manner upon impact of the particle stream.
  • the nozzle direction of the at least one nozzle of the nozzle device is arranged at an angle ⁇ to the main flow direction, where: 90 ° ⁇ ⁇ 180 °.
  • the angle ⁇ may be, for example, between 120 ° and 150 °, preferably 135 °.
  • the at least one nozzle of the nozzle device is aligned with the intersection of a center plane of the particle flow with the outlet plane of the outlet of the conduit.
  • the at least one nozzle is preferably aligned with the line of intersection of the horizontal center plane of the particle flow with the vertical outlet plane of the outlet of the conduit.
  • the nozzle direction of the nozzle or nozzles are aligned with the horizontal center line of the outlet.
  • the at least one nozzle is aligned with a portion of the outlet plane of the outlet of the conduit, which is located on the nozzle-facing side. In a horizontal course of the conduit, the at least one nozzle is thus aligned with a portion of the outlet plane of the outlet above the horizontal center line of the outlet.
  • the nozzle direction has a larger angle ⁇ to the main flow direction as compared with the above-described embodiment in which it is aligned with the horizontal center line of the outlet.
  • the binder beam is formed such that a complete deflection takes place when it has already arrived in the main flow direction in front of the outlet level of the outlet of the line. In other words, the binder jet partially penetrates into the conduit.
  • Such an orientation of the binder jet has been found to be particularly advantageous.
  • the orientation of the binder beam can, for example, on a section take place, which extends from the center line of the outlet with about a quarter of the diameter of the outlet.
  • the nozzle device may also be disposed on a portion of the conduit located in the dryer in the main flow direction in front of the outlet.
  • the binder can also already be introduced into the line in the particle flow counter to the main flow direction.
  • each nozzle has a nozzle feed line, wherein the nozzle feed line has a diameter D and before the nozzle exit a straight feed line section with a length L, where: L / D> 1.5.
  • the invention further relates to a method for adding particles, in particular wood particles such as wood fibers, in a dryer, wherein a particle stream is introduced into the dryer in a main flow direction and wherein binder is supplied to the particle flow.
  • the method according to the invention is characterized in that the binder is introduced with a velocity component directed counter to the main flow direction.
  • the binder is introduced as at least one liquid jet in the particle stream.
  • the advantages of introducing the binder counter to the main flow direction of the particle flow have already been described in relation to the device according to the invention and apply correspondingly to the method according to the invention.
  • the binder is introduced at a pressure between 5 and 40 bar. Under the pressure with which the binder is introduced, in the context of the invention, the pressure is understood immediately before the nozzle. It has been found that the introduction of the binder with such a pressure gives rise to a particularly advantageous liquid jet, which leads to a particularly advantageous distribution of the binder in the particle stream.
  • the binder is introduced at a rate of at least 50 m / s at a viscosity of the binder between 30 and 150 mPa-s.
  • a rate of at least 50 m / s at a viscosity of the binder between 30 and 150 mPa-s ensures that the binder penetrates relatively deep into the particle flow and thus a particularly advantageous atomization and distribution of the binder is achieved.
  • the velocity component directed counter to the main flow direction is relatively high, such that the collision of the binder with the particle stream occurs at an even higher relative velocity, thereby providing a higher kinetic energy for atomization of the binder.
  • the inventive method can be carried out in a particularly advantageous manner with the device according to the invention.
  • the binder in particular, for the binder to be fed to the particle flow in the main flow direction after it has been introduced into the dryer.
  • the liquid jet of the binder can be directed in particular to the outlet of a line carrying the particle stream.
  • the liquid jet of the binder may be directed at an angle ⁇ to the main flow direction of the particle flow, the angle ⁇ preferably being between 120 ° and 150 °, more preferably 135 °.
  • the inventive method may further provide that when introducing the particle flow into the dryer an annular flow surrounding the particle flow is generated, which influences the expansion behavior of the particle flow.
  • FIG. 1 shows a schematic sectional view through the dryer of a device according to the invention for the addition of particles
  • Figure 2 is a schematic detail view of the nozzle device
  • FIG. 3 is a schematic detail of the nozzle device of a device according to the invention.
  • Figure 4 is a schematic sectional view through a nozzle of a
  • Nozzle device of the device according to the invention is a Nozzle device of the device according to the invention.
  • a device 1 according to the invention for the addition of particles is shown schematically in a sectional view.
  • the device has a dryer 3, in which a particle flow of a particle-vapor mixture is introduced.
  • the dryer 3 is used to dry the particles.
  • the particle stream is introduced into the dryer 3 via a line 5 transporting the particle stream.
  • the particle flow in this case has a main flow direction, which is shown in Fig. 1 by an arrow.
  • the particle flow leaves the conduit 5 at an outlet 7 Main flow direction behind the outlet 7, the particle flow through a nozzle device 9, a binder is supplied.
  • the outlet 7 forming the end of the conduit 5 is shown schematically in detail.
  • the particle stream leaves the line 5, which is also referred to as a blowpipe or blowline, at high speed through the outlet 7.
  • the line 5 which is also referred to as a blowpipe or blowline, at high speed through the outlet 7.
  • the particle flow expands.
  • the nozzle device 9 is fastened above an indicated holder 15.
  • the nozzle device 9 consists of a nozzle tube 17, in which three nozzles 19 arranged in parallel are arranged, which are best shown in FIG. 3 can be seen.
  • the nozzles 19 are jet-forming nozzles, so that liquid jets of binder can be produced via the nozzle device.
  • the nozzles are oriented at an angle ⁇ to the main flow direction, which is also indicated by an arrow in FIG. the nozzle direction and thus the direction of the jet of liquid leaving the nozzles extend at an angle ⁇ to the main flow direction. In the embodiment shown in FIG. 2, the angle ⁇ is 135 °.
  • the nozzles 19 of the nozzle device 9 generate binder beams having a velocity component opposing the main flow direction. This ensures that the particle flow, which is passed through the line 5 at a high speed, bounces on the binder and this atomized very finely, whereby an advantageous gluing of the particles of the particle stream is achieved.
  • the nozzles 19 may in particular be aligned with the line of intersection of the horizontal center plane 5a of the particle flow with the vertical outlet plane 7a of the outlet 7 of the conduit 5. As a result, the binder strikes the middle region of the particle stream approximately in the outlet plane 7a, whereby an advantageous distribution of the binder is achieved. As best seen in Fig. 3, the nozzles 19 are supplied via the common nozzle tube 17 with binder.
  • the nozzle tube 17 extends at an acute angle to the horizontal, for example at an angle of 10 °. As a result, the cleaning of the nozzles 19 and the nozzle tube 17 can take place, since they can be completely emptied by means of compressed air.
  • each nozzle 19 has a nozzle feed 19a having a diameter D.
  • a straight supply line section 19c of the nozzle feed line is provided, which has the length L.
  • L / D 1.5. This ensures that the flowing through the nozzle 19 binder calms down and an advantageous liquid jet of binder can escape from the nozzle outlet 19b.
  • the binder When introducing the binder counter to the main flow direction of the particle flow can be provided that the binder is introduced at a pressure between 10 and 40 bar. In particular, it can be provided that the binder leaves the nozzle device 19 at a speed of at least 50 m / s, wherein the binder has a viscosity between 30 and 150 mPa-s.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Drying Of Solid Materials (AREA)
  • Nozzles (AREA)

Abstract

La présente invention concerne un dispositif (1) d'encollage de particules, notamment de particules de bois, comprenant un séchoir (3) et une conduite (5) permettant le transport du flux de particules. Le flux de particules est introduit dans le séchoir (3) dans une direction d'écoulement principale en passant par la sortie (7) de ladite conduite. Un liant est ajouté au flux de particules. Selon l'invention, le liant est introduit par un dispositif à buse (9) avec une composante de vitesse orientée à l'opposé de la direction d'écoulement principale.
EP16700268.2A 2015-01-28 2016-01-11 Dispositif et procédé d'encollage de particules Withdrawn EP3250352A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015201464.9A DE102015201464B4 (de) 2015-01-28 2015-01-28 Vorrichtung und Verfahren zum Beleimen von Partikeln
PCT/EP2016/050350 WO2016120046A2 (fr) 2015-01-28 2016-01-11 Dispositif et procédé d'encollage de particules

Publications (1)

Publication Number Publication Date
EP3250352A2 true EP3250352A2 (fr) 2017-12-06

Family

ID=55080123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16700268.2A Withdrawn EP3250352A2 (fr) 2015-01-28 2016-01-11 Dispositif et procédé d'encollage de particules

Country Status (5)

Country Link
US (1) US10493654B2 (fr)
EP (1) EP3250352A2 (fr)
CA (1) CA2975006A1 (fr)
DE (1) DE102015201464B4 (fr)
WO (1) WO2016120046A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106688190B (zh) * 2015-09-03 2018-07-24 Lg电子株式会社 在无线通信***中报告信道状态信息的方法及其设备
DE102016013435B4 (de) * 2016-11-10 2022-03-24 Siempelkamp Maschinen- Und Anlagenbau Gmbh Vorrichtung und Verfahren zum Beleimen von Partikeln
US11292184B2 (en) 2019-12-17 2022-04-05 Goodrich Corporation Extrusion additive manufacturing for veneer applications
US11534965B2 (en) 2019-12-17 2022-12-27 Goodrich Corporation Binder jetting additive manufacturing for veneer applications

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FR2332858A1 (fr) * 1975-11-28 1977-06-24 Anvar Procede de fabrication d'articles en particules ligneuses agglomerees, dispositif pour la mise en oeuvre de ce procede et articles obtenus selon le procede
CH628521A5 (de) * 1978-05-20 1982-03-15 Kaiser Wirz Max Verfahren und vorrichtung zum beimischen von fluessigen komponenten in schuettbare gueter.
US4478896A (en) * 1982-11-15 1984-10-23 Macmillan, Bloedel Limited Apparatus for blending wood strands with a liquid resin
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DE4122842C2 (de) * 1991-07-10 1993-11-18 Glunz Ag Verfahren zur Herstellung von Faserplatten aus stückigen Holzpartikeln und Isocyanat als Bindemittel
IT1274565B (it) * 1995-05-24 1997-07-17 Cmp Spa Incollatrice per impianti di produzione di pannelli in fibra di legno,e impianto utilizzante tale incollatrice
ATE324967T1 (de) 2000-08-11 2006-06-15 Flakeboard Company Ltd Verfahren und vorrichtung zum beleimen von zur herstellung von faserplatten vorgesehenen, getrockneten fasern
DE10059881B4 (de) * 2000-12-01 2005-06-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Anlage zur Faseraufbereitung
DE102006026124A1 (de) * 2006-06-03 2007-12-06 Glunz Ag Verfahren und Vorrichtung zur Beleimung von Partikeln im Bereich eines Blasrohrs
NZ566751A (en) * 2008-03-18 2008-10-31 Mdf Tech Ltd Atomising injection nozzle
DE102008063914A1 (de) * 2008-12-19 2010-06-24 Dieffenbacher Gmbh + Co. Kg Verfahren und Anlage zur Herstellung von Werkstoffplatten aus Fasern oder faserähnlichen Materialien, ein Transportrohr oder einen Rohrtrockner für beleimte Fasern und eine Faserplatte
EP2629946B1 (fr) * 2010-10-01 2019-07-17 Xylo Technologies AG Procédé et appareil de collage de particules de bois
UA108139C2 (uk) 2010-12-23 2015-03-25 Кроноплас Текнікел Аг Пристрій і спосіб повітряної сепарації деревної стружки та нанесення на неї клею
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Also Published As

Publication number Publication date
DE102015201464A1 (de) 2016-07-28
WO2016120046A3 (fr) 2016-09-29
US10493654B2 (en) 2019-12-03
US20180009127A1 (en) 2018-01-11
WO2016120046A2 (fr) 2016-08-04
CA2975006A1 (fr) 2016-08-04
DE102015201464B4 (de) 2016-10-20

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