EP3924157B1 - Procédé pour l'encollage de copeaux de bois - Google Patents
Procédé pour l'encollage de copeaux de bois Download PDFInfo
- Publication number
- EP3924157B1 EP3924157B1 EP20700779.0A EP20700779A EP3924157B1 EP 3924157 B1 EP3924157 B1 EP 3924157B1 EP 20700779 A EP20700779 A EP 20700779A EP 3924157 B1 EP3924157 B1 EP 3924157B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glue
- evaluation unit
- dispersing
- account
- unit
- 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.)
- Active
Links
- 239000003292 glue Substances 0.000 title claims description 76
- 238000000034 method Methods 0.000 title claims description 26
- 239000002023 wood Substances 0.000 title description 9
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 238000011156 evaluation Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000084 colloidal system Substances 0.000 claims description 3
- 230000000704 physical effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 230000000712 assembly Effects 0.000 claims 1
- 238000000429 assembly Methods 0.000 claims 1
- 230000009257 reactivity Effects 0.000 description 16
- 230000008569 process Effects 0.000 description 9
- 239000004848 polyfunctional curative Substances 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 239000011093 chipboard Substances 0.000 description 4
- 239000011094 fiberboard Substances 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 229920002522 Wood fibre Polymers 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000002025 wood fiber Substances 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000004497 NIR spectroscopy Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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
- B27N1/029—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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
- B05B7/26—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device
- B05B7/28—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid
- B05B7/32—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid the fed liquid or other fluent material being under pressure
-
- 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
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
Definitions
- the invention relates to a method for the gluing of comminuted lignocellulosic particles in the course of the production of material panels, wherein a glue that can be hardened by temperature and/or the addition of hardeners and comprises at least one formation of colloids is brought to a dispersing unit via a volume flow-adjustable conveyor and conveyor lines, in which the glue is homogenized by means of a crushing device and a mixing device and is finally conveyed via conveying lines to nozzle arrangements which spray the glue onto the particles in a mixing chamber.
- Material panels are now made from different crushed lignocellulosic particles and for different requirements. Closely related material panels are so-called chipboard and so-called fiberboard. Despite their relatively close relationship, there are still significant differences in the manufacturing process, and technological knowledge is not readily transferrable from one manufacturing process to another.
- Dispersing units work according to the rotor-stator principle with high shear gradients. They are also referred to as a homogenizer.
- the dispersing unit has an inlet and an outlet for the glue.
- the glue is accelerated very strongly by an inner rotor ring, in order to then be braked and sheared on a stator ring. In this way, solids and/or droplets are effectively broken up and distributed homogeneously.
- the extremely fine distribution of solids (suspensions) and liquids (emulsions) in the supplied glue is brought about by an elaborately coordinated interaction of various crushing processes. At the same time, the centrifugal force in the rotor causes the container contents to circulate. Solids and/or droplets are reliably crushed and distributed homogeneously.
- such dispersing units have essentially been used in the course of the production of fiberboard, in order to disperse mechanical impurities and reaction products that have not been completely dissolved.
- the problem associated with this glue for wetting the wood chips is that the glue changes its consistency and reactivity so quickly as a result of the dispersion that it already reacts in the pipelines, nozzles and mixing chambers, i.e. before the subsequent panel pressing process, in an undesired manner and hardens at least partially and sticks to the walls.
- a glue for wetting lignocellulosic particles, in particular wood chips is to ensure sufficient viscosity and reactivity for the production of the material panels.
- the object is achieved in that the conveyed amount of glue is determined and assigned to a speed of the dispersing unit in an evaluation unit, and this speed is then set.
- the speed of the dispersing unit is changed and set as automatically as possible with a control program.
- the speed of the dispersing unit is then primarily responsible for the intensity of the reactivity of the glue.
- the reactivity of the glue is closely related to the pH change that it undergoes as a result of the treatment in the dispersing unit.
- an optimal setting for the ratio of reactivity was possible in each case to be set at an open time.
- the optimal setting can even be used to save at least 10% of the amount of glue that is required in conventional processes.
- the glue changes its reactivity by adjusting the speed in such a way that finally sufficient adhesion of the chips is ensured during pressing.
- the invention assumes that the parameters of the production process have been incorporated into the method as the basis for the settings. These include, for example, the layer thickness that the glued chips should form and the production speed. If these parameters are changed, the chip throughput and thus the glue throughput will of course also change, which would immediately lead to different reactivities of the glue if the speed of the dispersing unit remained the same.
- the data is stored in the evaluation unit and can be assigned to the most suitable speed of the disperser.
- the method is preferably used for chip gluing.
- the amount of glue fed is determined, for example, by adjusting the glue feed device (e.g. the speed a feed pump) or by measuring devices for volume flow measurement.
- a direct assignment of the glue flow rate and the speed of the rotor of the dispersing unit is stored in the evaluation unit. This is determined in advance empirically or by mathematical calculation methods. The speed increases with increasing flow rate in order to achieve the same degree of homogenization. Other influencing factors can also be taken into account, so that a multivariate evaluation can be provided.
- the ambient temperature determined via at least one temperature sensor is also taken into account in the evaluation unit.
- the amount of hardener also determines the setting process.
- the change in viscosity over time with a hardener is nowadays calculable and can be included in the allocation of glue quantity to the speed of the disperser.
- the addition of the amount of hardener can also be controlled and/or regulated taking into account the data present and/or determined in the evaluation unit.
- the data stored in the evaluation unit takes into account whether the glue to be dispersed is intended for a middle layer or a top layer.
- the layers of wood-based panels require different amounts of glue and possibly even different reaction behavior. For example, this can simply be due to the fact that the ratios of the layer thicknesses of middle layers and top layers differ. In addition, different chip sizes can be used in the middle layer than in the top layer.
- relatively thick middle layers understandably also require more glue in order to achieve the desired strengths.
- Providing the middle layer with the same homogenized glue as, for example, relatively thin cover layers means that the glue in the middle layer of a wood fiber board is less reactive than in the cover layers, to which a hot press belt is usually also fed. Such an imbalance would be extremely undesirable. Therefore it makes sense to specify in the evaluation unit whether the glue is homogenized for a middle or top layer. Of course, this statement applies analogously to relatively thick top layers and a thin middle layer vice versa.
- the glue for the top layers and the middle layer is produced separately, so that the glue has the right consistency and reactivity in the manufacturing process of the wood-based panel.
- An infrared or near-infrared sensor which is preferably used, is particularly suitable as the measuring device.
- the invention is based on the 1 , an exemplary schematic diagram, explains the process in more detail.
- FIG. 1 shows a pump 2 for the binder or glue with which lignocellulosic particles 10 fed to a mixing chamber 5 are sprayed via a nozzle arrangement 6 in the mixing chamber 5.
- FIG. The nozzle arrangement 6 can be single-component or multi-component nozzles.
- the pressure in a nozzle can range up to that of high pressure nozzles (about 60 to 100 bar) to break up the glue or binder into very fine droplets.
- the nozzles can be controlled and regulated individually, possibly even independently of one another.
- the path of the glue runs from the pump 2 via the delivery lines 15c and 15a to the nozzle arrangement 6. On the way hardener can be metered into the glue from a reservoir 3 via a pump 4.
- the link between the conveying lines 15c and 15a is the dispersing unit 1, which is driven by the motor 7.
- Dispersing units work according to the rotor-stator principle with high shear gradients. They are also referred to as a homogenizer.
- the dispersing unit has an inlet at the end of the conveying line 15c and an outlet for the glue at the beginning the delivery line 15a.
- the glue is very strongly accelerated by an inner rotor rim, not shown, in order to then be decelerated and sheared at a stator rim, also not shown. In this way, solids and/or droplets are effectively broken up and distributed homogeneously.
- the extremely fine distribution of solids (suspensions) and liquids (emulsions) in the supplied glue is brought about by an elaborately coordinated interaction of various crushing processes.
- the reactivity of the glue can be influenced by the speed of the rotor. This speed adjustment can be used very profitably because the throughput of particles 10 can fluctuate or vary as desired for different products, thicknesses and individual layers in the material panel to be produced.
- speeds are stored in an evaluation unit 8 , one of which is selected as a function of various measured parameters and passed on to the motor 7 via a controller 9 and the control line 13 .
- the various parameters are queried and compared with the assignment to the rotor speed to be set, in order to then set the engine speed.
- the most important parameter is the conveyed amount of glue. Its measure can be determined, for example, via the speed of the pump 2 and passed on to the evaluation unit via a signal line 14c. Of course, other measuring methods and measuring devices can also be used as an alternative within the scope of the invention.
- Another important parameter is the amount of hardener that may be added to the glue. This can also be metered, for example, via the hardener pump 4, with the set value also being transferred to the evaluation unit 8 via the signal line 14a.
- the ambient temperature in 1 is brought to the evaluation unit via a temperature sensor 12 and the signal line 14b can be an influencing parameter.
- the glue just delivered is used for a top layer or a middle layer.
- This parameter can be significant because different reactivities of the glue may be required. So it is possible to use the in 1 illustrated plant in multiple copies for different tasks, so provide for example for top and middle layers of the material panel.
- Chemical and/or physical properties of the glue, at least downstream of the dispersing unit 1 can be recorded via a measuring device 11 as parameters that are often very decisive.
- the measured values are forwarded to the evaluation unit via the signal line 14d.
- a measuring device 11 with an IR sensor or specifically a near-infrared sensor has proven to be the most suitable.
- the urea and/or formaldehyde concentration as well as the solids content and the buffer capacity can be precisely recorded using automated FTIR spectrometers. This Values change with the speed of the dispersing unit 1 and influence the reactivity and viscosity of the glue.
- the measuring device can also be used with multivariate evaluation or as a cyclically measuring and evaluating device.
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)
- Application Of Or Painting With Fluid Materials (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Debarking, Splitting, And Disintegration Of Timber (AREA)
Claims (9)
- Procédé, destiné à encoller des particules (10) en cours de fabrication de plaques de matériaux, une colle durcissable par température et / ou par ajout d'agents durcisseurs comprenant au moins une formation de colloïdes étant amenée par l'intermédiaire d'un système de convoyage (2) à volume réglable et de conduits de convoyage (15a, 15c) vers une unité de dispersion (1), dans laquelle la colle est homogénéisée au moyen d'un dispositif broyeur et d'un dispositif mélangeur et convoyée en finalité par l'intermédiaire de conduits de convoyage (15a) vers des ensembles de buses (6) qui vaporisent la colle sur les particules (10) dans une chambre de mélange (5), caractérisé en ce que la quantité de colle convoyée est déterminée et est associée dans une unité d'évaluation (8) à une vitesse de rotation de l'unité de dispersion, et suite à quoi, ladite vitesse de rotation est réglée.
- Procédé selon la revendication 1, caractérisé en ce que le procédé trouve son utilisation lors de l'encollage de copeaux.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que la quantité de colle convoyée est déterminée par un réglage du dispositif de convoyage de colle (2) ou est détectée par des instruments de mesure destinés à mesurer un débit volumétrique.
- Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que dans l'unité d'évaluation (8) est prise en compte la température ambiante déterminée par l'intermédiaire d'au moins un capteur de température (12).
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que dans l'unité d'évaluation (8) est prise en compte une quantité d'agent durcisseur ajoutée.
- Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que dans des données sauvegardées dans l'unité d'évaluation (8), il est pris en compte si la colle qui doit être dispersée est prévue pour une couche centrale ou une couche de couverture de la plaque de matériaux.
- Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la colle pour les couches de couverture et pour les couches centrales est homogénéisée dans différentes unités de dispersion.
- Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que des propriétés chimiques et / ou physiques de la colle sont détectées au moins en aval de l'unité de dispersion par l'intermédiaire d'au moins un instrument de mesure (11).
- Procédé selon la revendication 8, caractérisé en ce qu'en tant qu'instrument de mesure (11) est mis en œuvre un capteur à infrarouge ou un capteur à infrarouge proche.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019001101.5A DE102019001101A1 (de) | 2019-02-14 | 2019-02-14 | Verfahren zum Beleimen von Holzspänen |
PCT/EP2020/050502 WO2020164821A1 (fr) | 2019-02-14 | 2020-01-10 | Procédé pour l'encollage de copeaux de bois |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3924157A1 EP3924157A1 (fr) | 2021-12-22 |
EP3924157B1 true EP3924157B1 (fr) | 2023-06-07 |
EP3924157C0 EP3924157C0 (fr) | 2023-06-07 |
Family
ID=69167806
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20700779.0A Active EP3924157B1 (fr) | 2019-02-14 | 2020-01-10 | Procédé pour l'encollage de copeaux de bois |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP3924157B1 (fr) |
CN (1) | CN113396036B (fr) |
DE (1) | DE102019001101A1 (fr) |
ES (1) | ES2951523T3 (fr) |
PL (1) | PL3924157T3 (fr) |
WO (1) | WO2020164821A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114474290A (zh) * | 2022-02-08 | 2022-05-13 | 福人集团森林工业有限公司 | 超薄大片刨花制备竹刨花板的连续平压工艺及加工设备 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1017881B (zh) * | 1987-12-16 | 1992-08-19 | 库特·赫尔德·法布里肯特 | 制造木材板的设备和方法 |
US7661871B2 (en) * | 2005-02-03 | 2010-02-16 | Robert Rinehart Hyatt | Apparatus for storing, mixing, metering, and injecting polymeric slurries into pipelines |
DE102009006704A1 (de) * | 2009-01-29 | 2010-08-12 | Dieffenbacher Gmbh + Co. Kg | Verfahren zum Betreiben einer Anlage und eine Anlage zur Herstellung von Faser-, MDF, HDF, Holzwerkstoff- oder Kunststoffplatten aus Fasern oder faserähnlichem Material |
HUE034504T2 (en) * | 2010-01-20 | 2018-02-28 | Xyleco Inc | Dispersion of raw materials and processing of materials |
DE102011103326B4 (de) * | 2011-05-27 | 2014-08-07 | Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg | Vorrichtung und Verfahren zum Beleimen von Fasern |
CN202702360U (zh) * | 2012-05-20 | 2013-01-30 | 漳州捷龙自动化技术有限公司 | 刨花板调施胶控制系统 |
DE102013104652A1 (de) * | 2013-05-06 | 2014-11-06 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Verfahren und Vorrichtung zur Beleimung von Spänen, Fasern oder faserähnlichem Material im Zuge der Herstellung von Werkstoffplatten |
DE102015100667A1 (de) * | 2015-01-19 | 2016-08-04 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Vorrichtung und Verfahren zur Konditionierung von Leim |
CN105858263A (zh) * | 2015-01-19 | 2016-08-17 | 国家林业局北京林业机械研究所 | 刨花输送计量设备及其输送刨花的方法 |
-
2019
- 2019-02-14 DE DE102019001101.5A patent/DE102019001101A1/de active Pending
-
2020
- 2020-01-10 CN CN202080012472.2A patent/CN113396036B/zh active Active
- 2020-01-10 ES ES20700779T patent/ES2951523T3/es active Active
- 2020-01-10 EP EP20700779.0A patent/EP3924157B1/fr active Active
- 2020-01-10 WO PCT/EP2020/050502 patent/WO2020164821A1/fr unknown
- 2020-01-10 PL PL20700779.0T patent/PL3924157T3/pl unknown
Also Published As
Publication number | Publication date |
---|---|
DE102019001101A1 (de) | 2020-08-20 |
WO2020164821A1 (fr) | 2020-08-20 |
CN113396036B (zh) | 2022-09-20 |
ES2951523T3 (es) | 2023-10-23 |
PL3924157T3 (pl) | 2023-10-02 |
EP3924157A1 (fr) | 2021-12-22 |
CN113396036A (zh) | 2021-09-14 |
EP3924157C0 (fr) | 2023-06-07 |
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