EP1468799B1 - Process and apparatus for adding glue to a flow of loose wood materials - Google Patents

Process and apparatus for adding glue to a flow of loose wood materials Download PDF

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Publication number
EP1468799B1
EP1468799B1 EP04075834A EP04075834A EP1468799B1 EP 1468799 B1 EP1468799 B1 EP 1468799B1 EP 04075834 A EP04075834 A EP 04075834A EP 04075834 A EP04075834 A EP 04075834A EP 1468799 B1 EP1468799 B1 EP 1468799B1
Authority
EP
European Patent Office
Prior art keywords
hopper
wood material
mixer
glue
mass
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
EP04075834A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1468799A3 (en
EP1468799A2 (en
Inventor
Paolo Benedetti
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.)
Imal SRL
Original Assignee
Imal SRL
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 Imal SRL filed Critical Imal SRL
Publication of EP1468799A2 publication Critical patent/EP1468799A2/en
Publication of EP1468799A3 publication Critical patent/EP1468799A3/en
Application granted granted Critical
Publication of EP1468799B1 publication Critical patent/EP1468799B1/en
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
    • B27N1/0263—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

Definitions

  • Loose wood materials used in processes of this type are preferably constituted by wooden chips or fibres which are mixed with glue to be made ready for use as woodchip or fibre panels.
  • a process and plant of this type is described in patent WO 02/066214 .
  • the plant described consists in a device for feeding loose wood materials to a mixer device, internally of which glue is sprayed onto the wood material flow through nozzles arranged in proximity of the inlet of the mixer device.
  • the mixer device is crossed by a flow of hot air sent by special means and introduced into the mixer device at the section thereof where the glue is sprayed.
  • the wood materials and the glue are united at the inlet of the mixer device and mixed uniformly as they pass through the mixer device, drawn by the hot air flow.
  • the wood material mixed with the glue is thus removed from the mixer and sent on to subsequent work stations.
  • the described process and plant exhibit some drawbacks.
  • the breadth of the front across which the glue is sprayed is limited to the inlet zone of the mixer device. This means that not all of the glue enters into immediate contact with the wood material, part of it being drawn by the hot air flow internally of the mixer device, where it partially unites with the wood material by effect of the mixer, but also partially sticks to the walls or the blades of the mixer, and is thus lost.
  • the limited breadth of the front the glue is sprayed across can also lead to the formation of glue clots which do not amalgamate with the wood material.
  • the parts of the glue which do not unite with the wood chips or fibres, drawn by the hot air flow in inlet in the mixer device, can mix up together and form clots which can form marks on the surfaces of the panels and might determine a breakdown of the physical and mechanical qualities of the panels themselves.
  • EP 1022103 discloses a gluing apparatus for plants for producing wood fibre panels by a dry method, the apparatus comprising a tubular body and sprayer means to inject a suitable liquid glue into the interior of the tubular body.
  • the cross-section through the tubular body encloses an area which increases in progressing from its open upstream end, into which the wood fibres are fed conveyed by an air stream, to its open downstream end.
  • DE 4115047 discloses an applicator for the continuous glueing of wood chips by liquid glue.
  • the applicator comprises a cylindrical mixing chamber supported in a holder, at whose one end is a feeder for the wood chips, and at the other end is an outlet. Axially through the centre of the mixing chamber passes a high speed rotary shaft equipped, in the injection zone, with injector nozzles and, in the mixing zone, with cooling mixer nozzles.
  • the injector nozzles can be cooled, and a glue feeder in the form of jet sprays is directed into the chip feeder opening.
  • the main aim of the present invention is to obviate the limitations and drawbacks of the prior art by providing a process according to claim 7 and plant according to claim 1 for adding glue to a flow of loose wood material which obtains a homogeneous mixture and a high degree of amalgamation between the glue and the wood chips or fibres.
  • the invention also considerably limits the loss of glue and prevents the formation of glue clots.
  • figure 1 is a schematic view of the plant according to the invention.
  • the plant comprises a device 2 for feeding a mass of loose wood material, in the form of chips or fibres, to a loading conduit 3 of a mixer 4 provided with an inlet 4a for wood material and an outlet 4b.
  • the plant further comprises means 5 for sending a flow of air into the loading conduit 3 and means for injecting 6 glue into the mass of wood material upstream of an entry of the wood material into the mixer 4.
  • the loading conduit 3 comprises a hopper 7 which exhibits at least an inlet 7a connected to the device 2 and at least an outlet 7b connected to the inlet 4a of the mixer 4.
  • a lateral wall 7c of the hopper 7 extends partially into the mixer 4 to part the inlet 4a section and to define an internal separating wall in the mixer 4.
  • the hopper 7 internally exhibits at least one dividing wall 8, arranged about parallel to the longitudinal axis x of the hopper 7, which defines a channel 9 for entry of the air flow.
  • the channel 9 exhibits an inlet 9a and an outlet 9b which is arranged upstream of the outlet 7b of the hopper 7.
  • the dividing wall 8 is positionable with a varying inclination with respect to the longitudinal axis x of the hopper 7 to realise a variable-section channel 9.
  • the means for injecting 6 comprise at least one injector 12 associated to the hopper 7 for atomizing and injecting the glue internally of the hopper 7 in a section downstream of the outlet 9b of the channel 9 for air inlet.
  • the injector 12 is mounted on an oscillating support so as to be orientable with a variable inclination with respect to a longitudinal axis x of the hopper 7.
  • the plant comprises a plurality of injectors 12 distributed on the lateral surface of the hopper 7 in predetermined configurations.
  • the injectors 12 are arranged along two parallel and opposite lines, respectively arranged on opposite sides of the hopper 7 at the channel 9 outlets.
  • the injectors 12 are mounted on oscillating supports in order to be orientable with variable inclinations with respect to the longitudinal axis x of the hopper 7.
  • the means 5 for sending an air flow into the loading conduit 3 comprise at least one heat-ventilator 10 a delivery of which is connected to an inlet 11a of at least one conveyor conduit 11.
  • the conveyor conduit 11 exhibits an outlet 11b which is connected to the inlet 9a of the channel 9.
  • At least one delivery regulator 13 is located on the conveyor conduit 11, which regulates the inlet air delivery into the hopper 7.
  • Figure 1 illustrates two conveyor conduits 11 with respective delivery regulators 13, each of which leads to a respective channel 9.
  • the process of the invention comprises the following stages.
  • a mass of loose wood material is fed from the device 2 into the hopper 7 loading the mixer 4, which mixer has an inlet 4a for the wood material and an outlet 4b. Together with the wood material, the hopper 7 receives a hot air flow from the heat-ventilator 10 the delivery of which is connected to the conveyor conduit 11.
  • the conveyor conduit 11 opens into the channel 9 which is arranged internally of the hopper 7.
  • the glue is injected and atomised onto the mass of wood material upstream of an entrance of the wood mass into the mixer 4; at least one injector 4 sends the glue onto the wood mass, which injector 12 is associated with the lateral surface of the hopper 7 in a downstream section thereof and on a same side thereof as the outlet 9b of the channel 9.
  • the air flow issuing from the outlet 9b has a containing action on the flow of wood material and realizes a compact front onto which the atomized glue is sprayed.
  • the mass of wood material mixed with the glue passes from the hopper 7 internally of the mixer 4 where a mixer shaft 14 mixes the wood material, homogenising the distribution of the glue.
  • the lateral wall 7c prevents the wood material mixed with the glue, drawn by the air flow, from being moved towards the outlet 4b of the mixer 4 as soon as it enters the inlet 4a, keeping it confined in a limited zone within the mixer 4.
  • the function of the lateral wall 7c is to make the wood-glue mixture distribute uniformly inside the mixer 4, filling the volume of the mixer 4 completely. The wood-glue mixture is then sent on to following work stations, exiting through the outlet 4b of the mixer 4.
  • the glue can be injected and atomised through a plurality of injectors 12, distributed over the lateral surface of the hopper 7 in predetermined and orientable configurations with variable inclinations with respect to the longitudinal axis x of the hopper 7.
  • the injectors 12 are arranged in two parallel rows and are opposite, being respectively aligned in a section downstream of the outlet 9b of a respective channel 9.
  • the glue is sprayed onto the mass of loose wood material on two opposite fronts, increasing the fraction of wood particles that enter directly into contact with the glue.
  • the plant and process described offer two important advantages: the structure of the hopper 7 loading the mixer 4 and in particular the presence of the channel or channels 9, which thanks to the position of the respective outlets, enable the glue to be sprayed on a compact front of wood material.
  • the fraction of glue which does not enter into contact with the chips or fibres is considerably reduced with respect to the prior art, with a consequent saving in glue volume used.
  • the drops of glue which do not enter into contact with the chips or fibres are limited in number, the risk that glue clots can form internally of the mass of wood materials is considerably reduced.

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)
  • Adhesives Or Adhesive Processes (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
EP04075834A 2003-04-15 2004-03-15 Process and apparatus for adding glue to a flow of loose wood materials Expired - Lifetime EP1468799B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000104A ITMO20030104A1 (it) 2003-04-15 2003-04-15 Metodo ed impianto per aggiungere collante ad un flusso
ITMO20030104 2003-04-15

Publications (3)

Publication Number Publication Date
EP1468799A2 EP1468799A2 (en) 2004-10-20
EP1468799A3 EP1468799A3 (en) 2005-03-23
EP1468799B1 true EP1468799B1 (en) 2010-11-17

Family

ID=29765364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04075834A Expired - Lifetime EP1468799B1 (en) 2003-04-15 2004-03-15 Process and apparatus for adding glue to a flow of loose wood materials

Country Status (4)

Country Link
EP (1) EP1468799B1 (it)
AT (1) ATE488343T1 (it)
DE (1) DE602004030068D1 (it)
IT (1) ITMO20030104A1 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103496027A (zh) * 2013-10-23 2014-01-08 国家林业局北京林业机械研究所 人造板预施胶装置和人造板拌胶设备

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ530339A (en) 2004-06-23 2007-01-26 Nz Forest Research Inst Ltd Method for producing wood fibre pellets
NZ544493A (en) 2005-12-22 2008-07-31 Nz Forest Research Inst Ltd Method for producing wood fibre composite products
IT1399772B1 (it) 2010-04-30 2013-05-03 Imal Srl Apparato per l'iniezione di componenti chimici in un flusso di materiale legnoso incoerente
DE102010064339A1 (de) * 2010-12-29 2012-07-05 Dieffenbacher GmbH Maschinen- und Anlagenbau Verfahren und Vorrichtung zur Benetzung von Streugut insbesondere von Fasern und/oder Spänen, mit einem Fluid
DE102011106211B4 (de) * 2011-06-07 2014-05-22 Fritz Egger Gmbh & Co. Og Vorrichtung und verfahren zur benetzung von holzpartikeln
DE202012104538U1 (de) * 2012-11-22 2014-04-29 Dieffenbacher GmbH Maschinen- und Anlagenbau Fallschachtanordnung mit zweifacher Reinigungseinrichtung, insbesondere für eine Vorrichtung zur Beleimung
CN115592764B (zh) * 2022-10-20 2024-02-09 福人木业（福州）有限公司 一种均匀施胶的刨花板施胶工艺及施胶设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH628521A5 (de) * 1978-05-20 1982-03-15 Kaiser Wirz Max Verfahren und vorrichtung zum beimischen von fluessigen komponenten in schuettbare gueter.
DE4115047C1 (en) * 1991-05-08 1992-07-16 Draiswerke Gmbh, 6800 Mannheim, De Continuous glue applicator to wood chips - has cooled mixt. application tools, and glue make-up mechanism
IT1307924B1 (it) * 1999-01-25 2001-11-29 Cmp Spa Apparecchiatura incollatrice per impianti per produrre pannelli infibra di legno.
ITMO20010033A1 (it) * 2001-02-23 2002-08-23 Imal Srl Metodo ed apparecchiatura per aggiungere collante ad un flusso di materiale legnoso incoerente

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103496027A (zh) * 2013-10-23 2014-01-08 国家林业局北京林业机械研究所 人造板预施胶装置和人造板拌胶设备

Also Published As

Publication number Publication date
ATE488343T1 (de) 2010-12-15
DE602004030068D1 (de) 2010-12-30
ITMO20030104A1 (it) 2004-10-16
EP1468799A3 (en) 2005-03-23
EP1468799A2 (en) 2004-10-20
ITMO20030104A0 (it) 2003-04-15

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