EP1441884B1 - Verfahren und vorrichtung zum benetzen von holzfasern mit einem bindemittelfluid - Google Patents

Verfahren und vorrichtung zum benetzen von holzfasern mit einem bindemittelfluid Download PDF

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Publication number
EP1441884B1
EP1441884B1 EP02802312A EP02802312A EP1441884B1 EP 1441884 B1 EP1441884 B1 EP 1441884B1 EP 02802312 A EP02802312 A EP 02802312A EP 02802312 A EP02802312 A EP 02802312A EP 1441884 B1 EP1441884 B1 EP 1441884B1
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EP
European Patent Office
Prior art keywords
binder
fluid
wood
air
wood fibers
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
EP02802312A
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German (de)
English (en)
French (fr)
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EP1441884A1 (de
Inventor
Hans-Dieter Kehrmann
Michael Himmelreich
Holger Reinecke
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.)
Fritz Egger GmbH and Co OG
Original Assignee
Fritz Egger GmbH and Co OG
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Publication date
Application filed by Fritz Egger GmbH and Co OG filed Critical Fritz Egger GmbH and Co OG
Publication of EP1441884A1 publication Critical patent/EP1441884A1/de
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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
    • B27N1/0227—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer
    • B27N1/0254—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer with means for spraying the agent on the material before it is introduced in the mixer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
    • Y10T156/13—Severing followed by associating with part from same source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1303—Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y10T428/249925—Fiber-containing wood product [e.g., hardboard, lumber, or wood board, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y10T428/24994—Fiber embedded in or on the surface of a polymeric matrix
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31975—Of cellulosic next to another carbohydrate
    • Y10T428/31978—Cellulosic next to another cellulosic
    • Y10T428/31986—Regenerated or modified
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31989—Of wood

Definitions

  • the invention relates to a method for wetting wood fibers with a binder fluid, in particular forlutebeleimen of wood fibers.
  • the invention also relates to a method for producing a fiberboard.
  • MDF Medium density fiberboard
  • HDF high density fiberboard
  • LDF very low density fiberboard
  • a pipeline the so-called blowpipe or the blowline, carries the mixture of steam, water and fibers from the refiner to the dryer.
  • the fibers In the blowline, the fibers have a very high speed in the range of 30 to 100 m / sec.
  • the sudden pressure drop at the outlet of the water vapor-water-fiber mixture from the blowline in the dryer supports the separation of the fibers.
  • Fiber agglomerates can be singulated so that the subsequent drying in a tubular dryer brings the fibers effectively in a few seconds to a fiber moisture content of about 10%, based on the dry mass.
  • Cyclones separate the dried fibers from the air stream and via conveyors they are fed to a separator for the separation of glue lumps, fiber agglomerates or entrained Anpackungen that dissolve from the inner wall of the riser and / or from the cyclones.
  • the dried fiber material thus treated passes to the forming line, where a low density fiber cake (20 to 30 kg / m 3 ) is formed.
  • a plate is formed in a press, which may have a thickness of 2 to 50 mm and a density of 60 to 1000 kg / m 3 .
  • the device comprises a digester and a downstream refiner, in which a mechanical defibration takes place in fine wood fibers. From the refiner emerges a mixture of steam, water and fibers and is passed through a blowpipe at high speed to a dryer.
  • the dryer is a directly heated, tubular dryer in which the end of the blowpipe is concentrically arranged.
  • a binder or a mixture of binder and additives is optionally supplied to the run of this mixture of steam, water and wood fibers, a binder or shortly before the end of the blow pipe.
  • binders an isocyanate binder can be used.
  • the dryer is followed by a cyclone in which the binder-wetted wood fibers can be deposited and fed to a Paserplattenher too.
  • the production technology known from the prior art described above provides for the supply of the binder to the mixture of water and wood fibers in the blowpipe, ie on the path of the fibers between the refiner outlet and the dryer inlet.
  • the binder is therefore exposed for a certain time to a high temperature of well over 100 ° C from the feeding to the fibers. This is significant in that the binder is to be cured in the press by the action of temperature.
  • Typical binders are condensation resins such as aminoplasts (urea-formaldehyde resin (UF), melamine-formaldehyde resin (MUF) or mixtures thereof) and / or isocyanates (eg PMDI).
  • the reactivity of the resins must be adapted to the increased temperature requirements in the course of gluing and drying in that they react very slowly. This is reflected in the cure rate.
  • a board press of the same size for chipboard has a performance about 50% higher than that for MDF.
  • the high press factor for MDF is also affected by other parameters such as e.g. Heating, steam transport from the outside to the center of the plate, evaporation behavior at the end of the press, influenced. The main influence, however, is the slow reactivity of the binder.
  • the binder in the blowpipe is exposed to water, so that the usable binders are also limited in so far. Because various binders that are suitable for the production of fiberboard, are not or only partially used for contact with water. This is especially true for isocyanates. Although so-called encapsulated isocyanates are in use, which are suitable in principle for a Blowlinebeleimung, but a trouble-free driving over several days is not possible. In general, the blowpipe grows through water-reactive isocyanate and the system must be turned off for cleaning.
  • the water in the blowpipe has a low pH, which results from the upstream cooking of the wood chips.
  • Aminoplasts such as urea-formaldehyde resins (UF) and melamine-formaldehyde resins (MF) are acid-hardening, which leads to pre-curing already in the blowpipe.
  • JP-A-57113051 An alternative method of making a fiberboard is known from JP-A-57113051.
  • Holzhconcesel be cooked first.
  • the cooked wood chips are then mechanically shredded, during which time a binder is added.
  • the wood fibers are dried.
  • fiber boards are pressed from the mixture of wood fibers and binder.
  • Thermosetting binders are used as binders, which may be a urea resin or a phenolic resin.
  • the present invention is based on the technical problem of improving the wetting of wood fibers with a binder.
  • the method for wetting wood fibers with a binder fluid according to claim 1 comprises the following steps.
  • the wood fibers are guided along a transport tube with a transport air flow to a guide tube, in which a conveying air flow is generated.
  • the binder fluid is supplied from the outside and distributed in the guide tube within the conveying air flow, whereby preferably a binder mist is formed.
  • the wood fibers are then conveyed in the conveying air stream together with the dispersed binder fluid and brought into contact therewith, so that the wood fibers are at least partially wetted with the binder fluid.
  • the conveying air flow exclusively serves to convey the wood fibers
  • the parameters of temperature, pressure and humidity of the conveying air flow can be set for optimum wetting of the wood fibers, in particular adapted to the properties of the binder fluid.
  • This has the advantage that more effectively the amount of binder fluid added to the wood fibers can be set very accurately.
  • This can in particular also take place with regard to the properties of the binder fluid, so that the proportion of the binder in the proportion by weight of the wood fibers compared to previous methods can be reduced.
  • the wood fibers are conveyed in the guide tube substantially vertically upwards, whereby deposits on side walls of the guide tube are reduced or even prevented.
  • an additive in the form of a fluid or in the form of a solid dispersed in a fluid may be added to the conveying air stream.
  • the wood fibers can thus be at least partially wetted in addition to the binder fluid with the additive. This makes it easy to add additives such as dyes, hardeners or agents for better fire resistance.
  • the method described above can be applied to a method for producing a fiberboard as follows.
  • the fiberboard is a medium density fiberboard (MDF), a high density fiberboard (HDF) or a low density fiberboard (LDF), which is at least a proportion of wood fibers and a proportion of binder.
  • MDF medium density fiberboard
  • HDF high density fiberboard
  • LDF low density fiberboard
  • wood is digested in a conventional manner in a digester under the action of temperature and pressure.
  • the excluded wood is mechanically shredded and the resulting mixture of water, water vapor and wood fibers is fed to a dryer with the aid of a blowpipe.
  • the wood fibers are at least partially separated and dried in the dryer.
  • the isolated and dried wood fibers produced in this way are then at least partially wetted with a binder fluid in the dry state with the aid of the process described above (dry gluing).
  • the method does not impose any special requirements on upstream or downstream production processes.
  • it can be applied to any type of application of a fluid to a fiber or to fine-particle air transportable material.
  • An upstream drying of the material is just as imperative as a further processing, eg plate forming after the application of the fluid.
  • the method is suitable to apply, for example, binders on mineral fibers (Steinwolledämmcommun), on glass fibers (Glasfaserdämmcommun) or on any kind of natural fibers (coconut, jute, hemp, sisal) for the production of insulation materials, molded fiber parts or the like, or in any synthetic way fibers.
  • finely divided material such as wood dust, dust from mineral-containing material (sands, quartz sand, marble dust, corundum) or the like can be wetted with fluid.
  • the method is suitable both as an independent device for applying a binder fluid on transportable wood fibers by means of an air flow, as well as for integration of this method in a manufacturing process for producing a fiberboard.
  • a fiberboard in particular medium-density fiberboard (MDF), high-density fibreboard (HDF) or low-density fiberboard (LDF), can be made up of at least a proportion of wood fibers and a proportion of binder.
  • the proportion of the binder may be less than 12 wt .-% based on the dry matter of the fiber content.
  • the proportion of the binder is less than 10 wt .-% based on the dry weight of the fiber content.
  • the proportion of the binder is less than 8 wt .-% based on the dry matter of the fiber content.
  • a fiberboard can be produced with a lower binder content than heretofore, which in addition to cost savings in the production also better environmental properties are achieved.
  • the binder may preferably be a urea-formaldehyde resin (UF), melamine-urea-formaldehyde resin (MUF) or an isocyanate (PMDI).
  • UF urea-formaldehyde resin
  • MAF melamine-urea-formaldehyde resin
  • PMDI isocyanate
  • other binders which are suitable for making a fiberboard may also be used.
  • Fig. 1 shows a schematic diagram of how, for example, the device for wetting the wood fibers in an existing manufacturing process for the production of fibreboard can be integrated by the dry process.
  • the drying of the fibers in the tubular dryer 1 is carried out in a known manner to a required for the manufacturing process moisture of, for example, 10% based on the dry mass.
  • some of the binder and the additives may already be applied to the fibers in the usual way in the blowpipe.
  • additives are waxes and paraffins for swelling, agents for improved resistance to biological pests, Colorants for individual color design of the finished plate or other liquid, solid and pasty components to understand.
  • binders and additives in a known manner, but can also be completely dispensed with and it is the entire amount of binder and additives applied by the method according to the invention on the fibers.
  • the required moisture which should have the fibers after the dryer 1, may well deviate from the usual humidity (about 5 to 15%).
  • a fiber blower 3 takes over the fibers here and conveys them into a usually vertically arranged riser pipe 5, in which additional transport air is introduced by a fan 4.
  • the riser 5 by means of a plurality of nozzles in a mist zone 6, the wetting of the fibers with binder and other components such as e.g. Additives.
  • the wetted fibers then pass into a cyclone 7 and a coarse material separator 8 (classifier) and are then fed to the usual further processing 9 such as shaping of the fiber cake and pressing for plate forming.
  • Fig. 2 shows a performance example of a plant for carrying out the method according to the invention.
  • the material 10 to be wetted is provided with a transport device 11 transferred into a pipe 16.
  • the mass flow of the material 10 can be determined via a weighing device 13.
  • a fan 14 conveys the material 10, mixed with additional transport air 15, via a transport line 16 in a generally vertical riser 17.
  • the amount of transport air 15 should be so large that a trouble-free transport of the material 10 to the riser 17 is guaranteed ,
  • the fan 14 also has the task to dissolve any existing agglomerates of the material.
  • a nozzle 18 can be located for the homogeneous distribution of the material 10 over the cross-sectional area of the riser 17, which can have special installations 19 for guiding current to better fulfill this task.
  • the transport speed of the material 10 in the transport line 16 is - to avoid deposits - by 20 m / sec and above.
  • An air blower 20 leads the riser 17 air 23 in sufficient quantity to promote the material 10 to.
  • air is meant not only air in the sense of ambient air, but any type of gases and mixtures thereof.
  • the air 23 may, if desired, be heated with a heating coil 41. It is also conceivable to bring the humidity of the air 23 with devices 40 for setting the same in a desired range. These devices 40 may for example consist of a water injection or a steam injection, if the absolute humidity is to be increased. To reduce the absolute humidity are cooling devices for the condensation of water vapor but just as conceivable.
  • the device 40 can understandably be arranged after the heating 41.
  • the air 23 supplied to the blower 20 may be ambient air or from some other process, e.g. from a combustion process, exhaust from a gas turbine, or exhaust from any other manufacturing process.
  • a mixture of different exhaust air streams is possible.
  • disturbances can be caused by solid and vapor contaminants, which lead to caking on the inner walls of the entire device and in particular in the air blower 20.
  • Built-in elements 22 are intended to accomplish or ensure distribution of the air 23 over the cross-sectional area of the riser 17, in order to set a flow profile which is favorable for carrying out the method. This may be homogeneous or have large differences between the edge and core regions.
  • the flow distribution does not necessarily have to be homogeneous. It may be necessary to arrange the distribution also in the flow direction behind the fixtures 22, such as e.g. the nozzle 18 and the internals 19, vote.
  • Fixtures 22 for guiding the air flow are also conceivable at other locations such as in the riser 17. But must in the case of an arrangement in areas in which fluid and / or material are already present, it is taken into account that soiling and / or wear of the installations 22 are possible, which impair the functioning of the device according to the invention.
  • the air 23 mixes with the material 10 and the transport air 15.
  • the speed in the riser 17 is selected depending on the aerodynamic properties of the material so that on the one hand a transport of the material 10 is made possible, but on the other hand agglomerates of the material can sink , For discharging these agglomerates devices 24 are present.
  • the discharged agglomerates 25 can be supplied to the material stream 10 of the transport device 11, depending on the condition. If necessary, the agglomerates 25 are dissolved in a processing plant 26.
  • the device 24 is shown here as a downwardly converging collecting cone, but any other embodiment is conceivable, such as e.g. a conveyor belt in the bottom region of the riser 17 or a Schneckenaustragsvorraum.
  • This consists of a plurality of nozzles 28, which distribute the fluid 30 as a fine fluid mist 29 over the cross-sectional area of the riser 17.
  • a pump 31 conveys the fluid 30 from a storage tank 32 to the nozzles 28.
  • nozzles 28 high-pressure nozzles have been proven by the airless principle, but also atomizers on all other principles are possible such. Air atomizing nozzles or rotary atomizers. High-pressure nozzles according to the airless principle and rotary atomizing require no additional medium such. Air to form the required spray 29.
  • the pump 31 supplies the fluid 30 to the nozzles 28.
  • the pressure depends on the rheological properties of the fluid 30 and the requirements of the fluid mist 29 with respect to the diameter of the individual fluid droplets.
  • such a device 33 is characterized in that the lines for the fluid 30 from the pump 31 to the fluid wetting unit 27 is at ground potential.
  • certain components may be made of a special material or have a special coating.
  • special materials are those considered, which are particularly suitable for the fan 14, the transport line 16, the nozzle 18 and the internals 19, and the fluid-carrying parts 27, 28, 31 and 32 due to the friction.
  • the fluid wetting unit 27 consists of a plurality of nozzles 28, which are mounted on the downstream side.
  • the wetted material with fluid 30 10 passes for the separation of air flow in a material separator 34 and is supplied to a further processing or storage 35.
  • the over-air 36 of the material separator 34 is either discharged to the environment as exhaust air 38 (possibly after exhaust air purification) or fed back to the process as return air 37.
  • the ratio of exhaust air 38 to the return air 37 is adjusted by means of the two control valves 39.
  • the cross sections of the transport line 16 and the riser 17 are preferably rotationally symmetrical, but any other cross-sectional shape is conceivable such. square, rectangular, polygonal or elliptical.
  • FIG. 3 An embodiment for the application of binder or additives on wood fibers is shown in FIG. 3.
  • Dried wood fibers from the dryer are separated from the dryer air in the cyclone 101 and discharged therefrom by means of a rotary valve 102.
  • the wood fibers 103 usually have a humidity in the range between 5 to 15%.
  • a conveyor belt 104 takes over the wood fibers and conveys them to the fiber transport line 105.
  • the fiber fan 106 brings the wood fibers 103 together with the transport air 107 to the nozzle 108, which releases the fibers into the riser 109 parallel to the axis.
  • the diameter of the transport line 105 is significantly lower than that of the riser 109.
  • An air blower 110 supplies air to the riser 109.
  • the bypass line 111 serves, depending on the position of the control flap 112 a partial flow of air past the riser 109 and opens into the riser before its entry into the cyclone 113. This ensures that, on the one hand, the cyclone 113 operates independently of the amount of air guided via the riser 109 at the ideal operating point and, on the other hand, the air quantity required for optimum functioning of the device is present in the riser 109.
  • a binder 116 is conveyed by a pump 118 from the reservoir 117 into a distribution pot 119. This supplies a plurality of nozzle lances 120, on which a plurality of airless high-pressure nozzles are arranged.
  • the number of nozzles is about 20 to 50 pieces per 1000 kg Wood fibers, which are led over the plant per hour.
  • the pressure range of the nozzles is between 10 to 80 bar, preferably between 20 and 40 bar.
  • Fig. 3 shows the position of the nozzle lances after the nozzle 108, whereby a contact of the nozzle lances 120 and the nozzles 121 with the wood fibers is possible.
  • An arrangement in the amount of the nozzle 108 or below to avoid contact with the wood fibers is also conceivable.
  • Fig. 4 shows in section the arrangement of the lances 120 in the riser 109.
  • a star-shaped arrangement (Fig. 4a) of the lances 120 with the nozzles 121 is also conceivable as a parallel arrangement (Fig. 4b).
  • the wood fibers 103 flow in Fig. 3 in the riser 109 through the binder mist 122, whereby a uniform wetting of the fibers takes place.
  • the cyclone 113 separates the fibers from the airflow.
  • the exhaust air from the cyclone can be partially re-supplied to the fan 110 via the return air line 123 in dependence on the position of the control flap 125, over-air is discharged via the line 124 to the environment.
  • the heating register 126 allows the air 115 to be heated.
  • the wood fibers 103a glued in this way are supplied for further production.
  • additives can also be applied to the wood fibers.
  • One possibility is the supply as a mixture of binder and additives, a separate feed with two separate application systems 120 and 131 and separate nozzle levels is also possible.
  • Fig. 3 shows this variant with the device 130, wherein the mist zone of the additives may be locally separate from the mist zone 122.
  • a common application of binder and additives in a single nozzle level is also conceivable.
  • certain lances 120 are subjected to binder, and other lances of the same nozzle level with additives.
  • the fibers come from a conventional dry-process MDF production line.
  • a gluing over the blowpipe is just as possible as a gluing exclusively on the dry gluing device.
  • the guide tube is designed as a vertical riser with a diameter ratio riser to transport tube of 3: 1.
  • the air velocity in the transport line is about 8 - 12 m / s, that of the conveying air flow in the riser between 20 and 30 m / s.
  • the gluing was then changed in such a way that 4.5% glue content based on the dry matter was metered in via the blowing line and 4.5% via the dry gluing device.
  • the properties of the plate thus produced did not change significantly.
  • the binder applied over the dry scrubber was significantly more reactive than that of the blowpipe gluing, which reduced the press factor by about 15% from 10 s / mm to 8.5 s / mm.
  • the size of the gluing was then changed so that the total binder amount of 5.5% based on the dry wood mass was applied with the dry gluing device.
  • the press factor could be reduced to 7 s / mm.
  • the properties of the plate thus produced did not change significantly
  • the same. Device was used for the production of HDF plates.
  • the binder used was a UF resin reinforced with 6% melamine.
  • the sizing was then changed to a ratio of blown pipe sizing: dry sizing of 6%: 5% as described in Example 1.
  • the properties of the HDF plate thus produced did not change significantly.
  • the press factor could be reduced from 9 s / mm to 7.5 s / mm.
  • the size of the gluing was then changed so that the total binder amount of 8% based on the dry wood mass was applied with the dry gluing device.
  • the press factor could be reduced to 6.3 s / mm.
  • the properties of the plate thus produced did not change significantly.
  • Gluing was varied as in the following table without significant change in plate properties: Glue blowing pipe: 2% 0% dry gluing: 2% 3%

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Paper (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
EP02802312A 2001-11-02 2002-11-04 Verfahren und vorrichtung zum benetzen von holzfasern mit einem bindemittelfluid Expired - Lifetime EP1441884B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10153593A DE10153593B4 (de) 2001-11-02 2001-11-02 Vorrichtung und Verfahren zum Benetzen von Holzfasern mit einem Bindemittelfluid
DE10153593 2001-11-02
PCT/EP2002/012286 WO2003037582A1 (de) 2001-11-02 2002-11-04 Verfahren und vorrichtung zum benetzen von holzfasern mit einem bindemittelfluid

Publications (2)

Publication Number Publication Date
EP1441884A1 EP1441884A1 (de) 2004-08-04
EP1441884B1 true EP1441884B1 (de) 2006-05-10

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EP02802312A Expired - Lifetime EP1441884B1 (de) 2001-11-02 2002-11-04 Verfahren und vorrichtung zum benetzen von holzfasern mit einem bindemittelfluid

Country Status (15)

Country Link
US (1) US7588832B2 (ru)
EP (1) EP1441884B1 (ru)
CN (1) CN100345671C (ru)
AT (1) ATE325689T1 (ru)
BG (1) BG108701A (ru)
BR (1) BR0213827B1 (ru)
CA (1) CA2464948C (ru)
CZ (1) CZ301590B6 (ru)
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DE10153593B4 (de) 2005-11-17
BR0213827A (pt) 2004-08-31
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ES2264739T3 (es) 2007-01-16
CA2464948A1 (en) 2003-05-08
RU2288094C2 (ru) 2006-11-27
CN100345671C (zh) 2007-10-31
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DE10153593A1 (de) 2003-05-22
CZ2004555A3 (cs) 2004-12-15
CN1596177A (zh) 2005-03-16
US7588832B2 (en) 2009-09-15
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BR0213827B1 (pt) 2012-03-20

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