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WO2003106127A1 - Procede et dispositif pour appliquer une matiere sur des fibres sechees servant a la production de panneaux de fibres - Google Patents

Procede et dispositif pour appliquer une matiere sur des fibres sechees servant a la production de panneaux de fibres Download PDF

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Publication number
WO2003106127A1
WO2003106127A1 PCT/EP2003/006250 EP0306250W WO03106127A1 WO 2003106127 A1 WO2003106127 A1 WO 2003106127A1 EP 0306250 W EP0306250 W EP 0306250W WO 03106127 A1 WO03106127 A1 WO 03106127A1
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WO
WIPO (PCT)
Prior art keywords
section
fibers
shaft
fiber
transport
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.)
Ceased
Application number
PCT/EP2003/006250
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German (de)
English (en)
Inventor
Fritz Schneider
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.)
Flakeboard Co Ltd
Original Assignee
Flakeboard Co Ltd
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 Flakeboard Co Ltd filed Critical Flakeboard Co Ltd
Priority to AU2003246427A priority Critical patent/AU2003246427A1/en
Publication of WO2003106127A1 publication Critical patent/WO2003106127A1/fr
Anticipated expiration legal-status Critical
Ceased 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

Definitions

  • the invention relates to a method and an apparatus for applying a substance to dried fibers provided for the production of fiberboard according to the preamble of claim 1 and claim 14.
  • the fibers are preferably made of lignocellulosic and / or cellulosic materials.
  • the fiberboard is light, medium-density or high-density fiberboard.
  • blow-line gluing it is customary to glue fibers which are intended for the production of MDF or HDF boards in the wet state.
  • the binder is sprayed into a blowing tube ending in the entrance area of the tube dryer behind a refiner onto the wet, still hot fibers.
  • the fibers are then dried.
  • Blow-line gluing enables uniform fiber gluing and thus prevents clumping by fibers and glue.
  • a major disadvantage of blow-line gluing is, however, a relatively high glue consumption (see, for example: Buchholzer, P., "Glue losses on the track", pp. 22-24, MDF magazine 1999).
  • the increased consumption Glue is caused by the fact that part of the reactivity of the glue is lost during the drying process of the fibers due to the high temperatures, so that in the dryer system the emission of formaldehyde resulting from the glue is considerable, which requires complex pollutant minimization.
  • blow-line gluing can be avoided by gluing the fibers in the dry state. It is known to glue dried fibers in a mixer. However, the dry gluing of fibers in mixers has the disadvantage that fiber agglomerates and matting occur, which lead to uneven fiber gluing and an un- desired formation of glue stains in the board surfaces (see loc. cit.).
  • a dry gluing machine, in which mixing tools can be provided, is described, for example, in EP 0 744 259 B1.
  • a method and a device for gluing wood chips are known, the gluing taking place in two stages when the chips are passed through a shaft-like shaft.
  • the chips to be glued are flat chips with two main surfaces to be glued.
  • the shaft curve-like shaft serves to turn the chips so that both main surfaces can be glued. NEN.
  • the chips move through the shaft relatively slowly.
  • a disadvantage of the known device is that the gliding surfaces of the device are also glued by penetration of the glue through the wood chips and, furthermore, in the second gluing step the glued upper side of the chips becomes the underside of the flow of chips and thus also the sliding surfaces of the device Glue come into contact. In this way, the lubricity of the chips on the sliding surfaces of the device can be severely restricted due to contamination.
  • gluing devices of the so-called “roller blender” type have been known for some time, in which glue is applied to wood particles by means of rollers (Maloney, Thomas M., “Modern Particleboard & Dry-Process Fiberboard Manufacturing", p 439 f, Miller Freeman Publ. 1977, San Francisco, Ca., USA).
  • the invention has for its object to avoid internal contamination of a pneumatic transport shaft, in which the fibers get from the outlet opening of the shaft section.
  • the fibers which can be glued or unglued, are fed from a metering device through a feed shaft to which a vacuum is applied to a fiber roller which is provided on its surface with a large number of pins which preferably taper conically in the radial direction.
  • the fiber roller rotates in such a way that the fibers are deflected by the pins and guided along a shaft section which is delimited by a partial section of the circumference of the fiber roller and by an opposite wall.
  • the fibers are held by the pins and accelerated to approximately the circumferential speed of the fiber roller by an air flow generated thereby.
  • the fibers are preferably removed from the fiber roller by the centrifugal force and lie against a section of the wall, the fibers no longer coming into contact with the pins.
  • the fibers leave the feed chute in a fiber stream and hit the fiber roller. Due to the action of the pins arranged on the rapidly rotating fiber roller, the fibers are not only deflected, but also greatly accelerated, as a result of which irregularities such as fiber agglomerates are eliminated. Furthermore, the fiber flow is stretched by the acceleration of the fibers in the direction of flow by a multiple compared to the fibers in the feed shaft. At the same time, the pressure with which the fibers are pressed against the wall during transport through the shaft section increases the bulk density of the fibers, for example to three times the bulk density of the fibers within the feed shaft. Accordingly, the fiber flow height is reduced with increased bulk density.
  • the fibers enter a pneumatic transport shaft with a wave-like section.
  • the wave curve-like section has a first arc section and an oppositely curved second arc section.
  • the second arch section can directly adjoin the first arch section, so that the wave-curve-like section consists of the two arch sections.
  • a straight section which is part of a transition region from the first to the second curved section, can also extend between the two curved sections.
  • the wave curve-like section can be a wave-shaped section, in particular a sinus curve-like section, ie a section which essentially has the shape of a sine curve. It can also be provided that the two arc sections, or at least one of the two arc sections, are essentially semicircular.
  • the two arc sections are not configured symmetrically to one another.
  • the air flow transporting the fibers through the pneumatic transport shaft has such a speed that the fibers are pressed against an outer wall section of the first sheet section due to the centrifugal force.
  • the outer wall section is understood to mean that part of the wall of the transport shaft which has the larger radius compared to an inner wall section.
  • the fibers are directed through a first guide plate, which is arranged approximately in the transition area from the first to the second curved section and inclined like a ramp, to an opposite wall section of the transport shaft.
  • the transition area can extend between the two arc sections.
  • the first guide plate can preferably be arranged after a curvature of 180 ° in the transport shaft, in particular where the direction of curvature changes, ie at a turning point of the wave-curve-like section or the wave curve.
  • the first guide plate can also be arranged somewhat in front of or behind the turning point, namely in such a way that the fibers are directed to the opposite wall section and initially remain there due to the centrifugal force.
  • the fibers preferably reach the first baffle in a millimeter-thin fiber film which is closed in the surface and leave the first baffle in this form.
  • the first guide plate is preferably adjustable at an angle to the direction of flow of the fibers, so that the fibers can be optimally directed to the opposite wall section of the transport shaft, namely the outer wall section of the second curved section of the transport shaft.
  • the fiber stream thus provided with the fabric on one side then enters the second curved section of the transport shaft, or after passing through the possible straight section.
  • the fiber stream is pressed, preferably again in a millimeter-thin fiber film, against the outer wall section of the second arc section.
  • the fibers or the fiber stream lie with the side not yet provided with the fabric, that is to say untreated, against the outer wall section of the second arch section.
  • the fibers are then directed through a second guide plate, which is arranged on the outer wall section of the second curved section, to the opposite wall section of the transport shaft.
  • the fibers are subjected to a treatment step again, the side of the fibers or the fiber stream which has not yet been treated now being provided with the substance. Again, this is preferably done via at least one spray nozzle.
  • the nozzles can in particular be multi-component atomizing nozzles in which air or another gas is used as the atomizing gas.
  • the substance to be applied can be, in particular, glue, a hardener (accelerator), dye or water vapor.
  • Dyes are commercially available in powder form.
  • An important substance that has to be applied after gluing the fibers is a hardener, which accelerates the reactivity of the glue. If possible, the hardener is brought into contact with the glued fibers at the end of the process preceding the formation of a nonwoven in order to avoid pre-hardening of the glue and at the same time to make the glue as aggressive as possible.
  • the method according to the invention which can be used for this after the glued fibers have been sifted, offers an ideal possibility for this.
  • the application of water vapor to glued fibers can be advantageous in order to keep the fibers as warm as possible by such conditioning before they are pressed into a plate in a press. In this way, the fibers can be conditioned, which can bring advantages by shortening the pressing times.
  • the moisture content of the fibers can be adjusted very precisely using the method according to the invention.
  • multi-substance atomizing nozzles can be used, in which water vapor is used as the atomizing gas. In this way, water vapor and another substance to be applied can be applied to the fibers simultaneously. If only water vapor is to be applied to the fibers, a single-component nozzle is sufficient.
  • the process according to the invention is used to glue the fibers, the application of a very thin glue film to the fibers is sufficient because the fibers are pulled apart to form a preferably millimeter-thin fiber film.
  • This thin glue film dries in a fraction of a second during pneumatic transport through the transport shaft, so that the glue applied in the first gluing step is largely or completely dried when the fibers with the glued side follow the second gluing step against the opposite wall section of the transport shaft issue. That way soiling of the wall of the transport shaft is prevented by glue attachments.
  • the flow pattern of the treated fibers is oriented due to the baffles and the alternating centrifugal force such that immediately after the application of the material there is no contact of the treated fiber surface with the wall of the transport shaft.
  • a preferably micrometer-thin glue film has the opportunity to dry through the transport air before the glued side of the fibers comes into contact with the wall of the transport shaft.
  • the area of the transport shaft in which glued fibers are transported is preferably completely covered with a water-cooled cooling jacket.
  • the cooling jacket has the task of bringing the inner surfaces of the transport shaft to a temperature which triggers condensation of the moisture in the transport air.
  • the resulting condensation film on the inner surfaces prevents caking of glue. This is an additional measure that counteracts internal contamination of the pneumatic transport shaft.
  • the fibers emerge essentially horizontally at the outlet opening of the shaft section and are subsequently sighted. This sighting occurs because the air flow of the pneumatic transport shaft is generated by negative pressure and acts downwards or upwards on the fibers. Fibers, which represent normal goods, are deflected in this way into the transport shaft, while impurities in the form of coarse goods are fed to a coarse goods discharge which has an inlet lying in the direction of throw of the fiber roller or opposite the outlet opening of the shaft section. When the air flow is directed downwards, the coarse material is deflected less than the normal material. When the air flow is directed upwards, the normal goods are deflected upwards, while the coarse goods are deflected downwards. When the gluing process is applied, the fibers are at the time of this Sifting not yet glued, so that internal contamination of the classifier used or an inlet opening of the transport shaft is avoided.
  • the fibers When exiting the shaft section delimited by the fiber roller and an opposite wall, the fibers are preferably introduced into the air flow of the transport shaft in such a way that they run into the first curved section along the outer wall section of the transport shaft. This can be achieved, for example, by an adjustable flap arranged at the end of the shaft section.
  • the air speed in the transport shaft is preferably selected such that the fibers press themselves against the outer wall section substantially in the form of a fiber film, approximately from the center of the first arc section.
  • the air speed can be adjusted by an adjustable slide in the transport shaft.
  • the second guide plate is arranged approximately at the end of the second curved section.
  • the transport shaft is preferably rectangular in cross section.
  • the width of the transport shaft increases after each treatment step in order to prevent sidewall regions of the transport shaft from coming into contact with the fiber material immediately after the substance has been applied.
  • the fiber stream is constricted laterally shortly before each treatment step by means of corresponding guide plates.
  • Warm air can be used as transport air in the transport shaft.
  • This warm air can be partly exhaust air recirculated from a cyclone and partly preferably fresh air that is heated.
  • the warm air prevents the fibers from cooling down. This is desirable because warm fibers shorten the process in the plate press.
  • the fresh air replaces Ventilation air, which is required to remove residual moisture, which is dried out of the fiber material on the transport path from drying to the formation of a nonwoven fabric.
  • the fresh air is preferably blown through openings arranged in the transport shaft in such a way that the fresh air helps to guide the fiber stream to the opposite wall section of the transport shaft. This means that the fresh air openings are arranged adjacent to the at least one first and the at least one second nozzle in the transport direction.
  • the throughput of fibers through the transport shaft depends on the operating conditions of the plate production and is subject to fluctuations. The demand for the substance to be applied fluctuates accordingly.
  • the aforementioned adjustable slide is preferably provided on the suction side of a fan.
  • the air volume and thus the flow velocity and speed of the fibers in the pneumatic transport shaft can be determined via this slide.
  • glue the contact area results from the glue throughput, the mean drop size of the glue spray generated by the glue spray nozzles remaining constant.
  • the fiber throughput determined gravimetrically by a weighing device of the metering device is preferably used as the guide variable for the transport air control.
  • the transport shaft has a plurality of sections arranged in series, similar to wave curves.
  • the wave curve-like sections can serve to carry out several identical treatment stages in succession. Since only a small percentage of the ultimately desired material application is carried out at each treatment stage, in particular a very rapid drying of an applied liquid, in particular a glue film, can be guaranteed and thus internal contamination of the transport shaft or a classifier can be avoided particularly safely.
  • the other wave curve-like sections can, however, also be used, via others, accordingly arranged nozzles to wet the fibers by spraying with another substance, such as other additives or water vapor.
  • the process is characterized by a high degree of uniformity in the distribution of substances. This uniformity is ensured by the fact that very large contact surfaces are provided both with respect to the fibers by means of the fiber roller and with respect to the material by atomization, which are brought together in a uniform manner. In particular, over-gluing of fibers can thereby be avoided.
  • the above object is achieved with regard to the device by the features of claim 14. Essentially the same advantages result here as were previously mentioned in connection with claim 1.
  • Preferred embodiments of the device are listed in claims 15 to 26.
  • the substance to be applied can be a hardener, but also one of the other substances mentioned above.
  • the device can thus also be a device for gluing, in which case the nozzles are glue nozzles.
  • FIG. 1 schematically shows a gluing device with a wave-curve-like section and a fiber sifter unit
  • Fig. 2 shows a gluing device with two gluing stages
  • Fig. 3 shows a device for applying a hardener.
  • the dosing bunker 1 has a metering bunker 1.
  • the dosing bunker 1 has an inlet 2 for filling with dried wood fibers 3.
  • the wood fibers 3 are fed to a dosing bunker discharge with discharge rollers 5 by means of a base belt 4. Larger clumps of the fibers 3 are dissolved by the discharge rollers 5.
  • the bottom band 4 runs on a belt scale 6, which continuously records the running fiber throughput weight (weight per unit of time).
  • the fibers 3 From the dosing bunker discharge 5, the fibers 3 enter a feed shaft 9 made of two molded walls 7 and 8, which has an air supply 10 at an upper end. A mixture of fibers and air is sucked into the feed shaft 9 by means of a pneumatic transport device which has a feed shaft 11 which is rectangular in cross section and a fan 12, the fibers moving in a fiber stream 13 along the mold wall 8 to an outlet opening 14 of the feed shaft 9 , In the area of the outlet opening 14 of the feed chute 9, the fiber stream 13 encounters a fiber roller 15 which serves to resolve irregularities in the fiber stream 13 and to accelerate the fibers in the fiber stream 13.
  • a plurality of pins 16 are arranged on the surface of the fiber roller 15, which taper conically to a tip as the distance from the axis of rotation of the fiber roller 15 increases.
  • the fiber roll 15 rotates at high speed in the direction of rotation indicated by the arrow 17.
  • the peripheral speed of the fiber roller 15 is variable and can be 20 to 100 m / sec.
  • the diameter of the fiber roller 15 can be, for example, 1000 mm and the length of the fiber roller 15 can be, for example, 1800 mm. In this case, the conical pins 16 are approximately 10,000 pieces.
  • the outlet opening 21 of the shaft section 20 is delimited by a flap 23 which is adjustable in angle.
  • the transport shaft 11 adjoins this at approximately a right angle to the outlet opening 21 of the shaft section 20.
  • the transport shaft 11 has a corrugated section 24, which consists of a first Semicircular section 25 and a second semicircular section 26 is composed.
  • a first guide plate 27 is arranged in the wall of the transport shaft 11 approximately at the turning point of the wave-shaped section 24.
  • the first guide plate 27 is inclined like a ramp in the transport direction of the transport shaft 11. This inclination is adjustable.
  • first glue spray nozzles 28 (only one is shown) is arranged across the width of the transport shaft 11 in a wall opening. Adjacent to the first glue spray nozzles 28 is an opening 29, which extends over the width of the transport shaft 11, for the supply of fresh air.
  • the fresh air supply is indicated by arrow 30.
  • a second guide plate 27a which can be set at an angle, a row of second glue spray nozzles 28a and a second fresh air opening 29a for supplying fresh air 30a.
  • a controllable slide 31 is arranged in the transport shaft 11 for setting the flow speed of the air flow indicated by the arrow 32.
  • a fiber transport line 33 leads from the fan 12 to a cyclone 34.
  • Fibers separated in the cyclone 34 are transported by the cyclone 34 in the direction of the arrow 35 to a fiber molding machine, not shown. Exhaust air leaves the cyclone 34 partly as ventilation air 36, through which moisture dried out of the fiber material is removed on the way from the drying, not shown, to the cyclone 34. Exhaust air from the cyclone 34 is also used for the air flow 32 via an air supply line 37.
  • the gluing device also has a fiber sifter unit 40.
  • the shaft section 20 opens directly into an inlet opening 41 of the transport shaft 11. Adjacent to the inlet opening 41 and opposite from the outlet opening 23 is an inlet 42 of a coarse material discharge chute. 43 arranged.
  • the coarse material discharge shaft 43 extends in the vertical direction and has a coarse material discharge 44 having a screw at its lower end. Air supply openings 45 are arranged above the coarse material discharge 44.
  • An adjustment flap 46 delimits the inlet 42 of the coarse material discharge chute 43 on the upper side.
  • Reference number 47 indicates a flange of the fiber sifter unit 40.
  • the fibers are deflected into the shaft section 20 by the fiber roller 15.
  • the fibers are accelerated to approximately the peripheral speed of the fiber roller 15. This fiber speed is reached in this gluing device approximately after a quarter of the circumference of the fiber roller 15.
  • the fibers in a fiber stream 50 are stretched to a multiple of the fiber stream 13 in the feed shaft 9. Due to the large number of conical pins 16, an air flow is generated in the shaft section 20 which corresponds approximately to the peripheral speed of the fiber roller 15.
  • the fibers in the shaft section 20 centrifugally outward and lie against an inside of the wall 19 of the shaft section 20, so that the conical pins 16 of the fiber roller 15 to about a quarter of the circumference of the fiber roller 15 are no longer in contact with the fibers in the shaft section 20.
  • the fibers of the fiber stream 50 are directed into the inlet opening 41 of the transport shaft 11 via the flap 23 and the air stream 32, insofar as the fibers are normal material 51. In this case, the fibers enter the transport shaft 11 essentially adjacent to the wall of the transport shaft 11 opposite the fiber classifier unit 40.
  • Coarse material 52 which is heavier than the normal material 51 consisting of average heavy individual fibers, describes a longer throwing parabola due to the higher kinetic energy and thereby gets into the coarse material discharge shaft 43. Due to a small air flow prevailing in the coarse material discharge shaft 43, fiber particles which are in the Boundary range between light and heavy, lifted back out of the coarse material discharge shaft 43 into the air flow 32. Heavy parts of the coarse material 52, on the other hand, fall into the coarse material discharge 44.
  • the flap 46 is adjustable in its angle and is used to adjust the speed and the direction of the air flow 32 in the area of the inlet opening 41 of the transport shaft 11 or the inlet 42 of the coarse material discharge shaft 43 in this way, the throwing parabola of the fiber stream after exiting the shaft section 20 can be influenced.
  • the normal material 51 moves as a fiber stream 53 along an outer, larger radius wall section 54 of the first semicircular section 25. Due to the centrifugal force existing in the first semicircular section 25, the fiber stream 53 is compressed into a millimeter-thin fiber film 55 closed in the surface. This condition is reached at the usual air speeds in the gluing device after approximately 90 ° of the first semicircular section 25. After preferably 180 °, the fiber film is guided over the first guide plate 27 and thereby lifted off the outer wall section 54.
  • the fibers are glued by means of the first glue spray nozzles 28 before they come with their unglued side to an outer wall section 54a of the second semicircular section 26 and are subsequently pressed against the outer wall section 54a as a fiber film.
  • the gluing takes place the other side of the fiber stream by means of the second guide plate 27a and the second glue spray nozzles 28a in a manner corresponding to that previously the gluing of the first side of the fiber stream.
  • the fresh air supply 30 and 30a ensures the replacement of the vented ventilation air 36 and, on the other hand, supports the baffle 27 or 27a in its effect of guiding the fiber film to the opposite wall section of the transport shaft 11.
  • the flow rate of the fibers from the discharge of the dosing hopper 1 to the fiber transport line 33 can be adjusted via the adjustable slide 31.
  • the device according to FIG. 1 is used in the form described for gluing the fibers.
  • the device can also be used without or without significant changes, e.g. apply a hardener to dry-glued fibers.
  • the device can also be used to add other additives in liquid or solid form, e.g. Powder-form dye to apply to the fibers. It can also be used to apply water vapor to the fibers for heating or conditioning them.
  • the device may have to be designed accordingly with regard to the type of nozzles through which the substance is applied.
  • the gluing device according to FIG. 2 is designed for gluing fibers in two stages.
  • the gluing device has a first gluing unit 61 and a second gluing unit 62.
  • the second gluing unit 62 corresponds to the gluing device according to FIG. 1 except for slight differences, e.g. a reversed arrangement of the fiber roller and the fiber sifter unit.
  • the first gluing unit 61 has a cyclone 63, to which dried fibers, as indicated by the arrow 64, are fed.
  • the cyclone 63 is connected via a fiber transverse distribution device 65 with an inlet of a metering bunkers 66 connected.
  • the dosing hopper 66 has a floor belt 67 with a belt scale 68 and discharge rollers 69.
  • Wood fibers 70 pass from the dosing hopper 66 into a feed shaft 71, which is part of a pneumatic transport device and has an air feed 72 at an upper end. A mixture of fibers and air is sucked into the feed shaft 71 by means of a fan 73, the fibers meeting in a fiber stream 74 with a fiber roller 75 which is designed and acts in accordance with the fiber roller 15 of the gluing device according to FIG. 1, in the opposite direction of rotation.
  • the fibers pass from a shaft section 77, which corresponds to the shaft section 20 of the gluing device according to FIG. 1, into a channel section 78 of the pneumatic transport device, in that the fibers are introduced into the channel section 78 according to arrow 79 Airflow can be diverted downwards.
  • the fibers are glued by two rows of glue spray nozzles, one of which is shown and is designated by the reference numerals 80 and 81, respectively.
  • the air flow led into the duct section 78 is recirculated exhaust air from a cyclone 82 of the second gluing unit 62. Ventilation air of the cyclone 82 is indicated by the reference number 84.
  • the fibers provided with glue reach the cyclone 82 via the channel section 78 of the pneumatic transport device.
  • the glued fibers are separated in the cyclone 82 and fed to a metering bunker 1 via a further fiber transverse distribution device 83.
  • the fibers 3 arrive as fiber stream 13 from the dosing hopper 1 into a feed shaft 9 and from there onto a fiber roller 15.
  • the further features of the second gluing unit 62 correspond to the features of the gluing device according to FIG. 1.
  • a further gluing of the fibers takes place in the wave-shaped section 24, by means of the first guide plate 27 and the first glue spray nozzles 28 as well as the second guide plate 27a and the second glue spray nozzles 28a.
  • openings for supplying heated fresh air are also provided in accordance with FIG. 1.
  • the fibers are glued in two stages, the second gluing stage again being divided into a gluing in the middle and a gluing at the end of the wave-shaped section 24.
  • Such gluing in two gluing stages leads to yet another better glue distribution compared to gluing in a single gluing stage.
  • this two-stage gluing can further reduce the internal contamination of the pneumatic transport device and the fiber sifter unit 40, because in each gluing stage the amount of glue applied can be reduced accordingly, thereby intensifying the drying of the glue film produced after the respective gluing stage, which is achieved again a reduction in the cold stickiness of the glue.
  • the factor 2 in the calculation of the working width results from the two gluing steps in the middle and at the end of the undulating section 24. Fiber throughput dry
  • Fiber contact area per unit of time 210 m 2 / sec
  • Fiber flow density 50 kg / m 3 fiber throughput: 105 x 0.00 '
  • the glue liquid is atomized to a mean volumetric drop size of 20 ⁇ m.
  • Liquid glue per unit of time 0.442 l / sec
  • This calculation example shows that the fiber contact area per unit of time is significantly larger than the glue contact area. This enables the fibers to be glued very evenly, and the glue can also be dried very quickly. In this way, internal contamination of a pneumatic transport unit or a fiber sifter unit is largely reduced.
  • the device according to FIG. 3 is very similar to the gluing device according to FIG. 1 and, as the essential difference, has a fiber sifter unit 90 which works with an essentially upward air flow 91.
  • the Fibers of the fiber stream 50 which leave the shaft section 20 via the outlet opening 21, are lifted via the flap 23 and the air stream 91, insofar as the fibers are normal material 51, to an inlet opening 101 of the wavy section 24.
  • Coarse material 52 is directed due to the predominant gravity into the inlet 42 of the coarse material discharge shaft 43 opposite the outlet opening 21.
  • a cellular wheel lock 92 is arranged below the coarse material discharge shaft 44.
  • the coarse material is discharged via a transport line which has an air supply 94 and a fan 95.
  • Air regulating flaps 96 are attached to the inlet 42 of the coarse material discharge chute 43.
  • Air regulating flaps 97 are likewise arranged at an outlet opening 98 of the air supply line 37.
  • the fibers 3 enter the metering bunker 1 via a shaft 85 with a fiber transverse distribution device in the form of a cellular wheel sluice 86 and an electromagnet 87, which is used to separate metal parts from the fiber stream indicated by an arrow 88.
  • a stripping rake 89 guides incoming fibers a rear part of the dosing bunker 1. From the discharge rollers 5 arranged at the front end of the dosing bunker 1, the fibers 3 reach a disc separator 105, which separates coarse particles and leads into a further coarse material discharge 106.
  • a flap 99 is arranged at the entry opening 101 of the wave-shaped section 24, which leads the fibers 51, which reach the transport shaft 11 from the fiber sifter unit 90, to the outer wall section 54 of the first semicircular section 25.
  • the flap 99 also serves to be able to set an opening 100 for the supply of fresh air.
  • the strength of the ascending air flow 91 in the fiber sifter unit 90 can be regulated via this variable fresh air opening 100.
  • a substructure of the device is designated by reference number 107.
  • the fibers which are provided with a hardener by means of the device according to FIG. 3, have previously been glued dry in a gluing device. After the hardener has been applied, the fibers can be fed to a molding machine and then to a press.

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  • 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)

Abstract

La présente invention concerne un procédé et un dispositif pour appliquer une matière sur des fibres séchées qui sont amenées à un cylindre à fibres rotatif (15) de manière dosée et sont déviées et accélérées par ce cylindre. Cette invention est caractérisée en ce qu'elle consiste à amener les fibres dans un puits de transport (11) qui comprend une section ondulée (24) présentant un première section arquée (25) et une seconde section arquée (26) à courbure inverse, à les comprimer contre une section de paroi extérieure (54), à les diriger dans une zone de transition de la première section arquée (25) à la seconde section arquée (26), jusqu'à une section de paroi opposée (54a) du puits de transport (11), à leur appliquer la matière sur un côté à l'aide d'une première buse (28), à les diriger à nouveau jusqu'à une section de paroi opposée (54a) du puits de transport (11), puis à leur appliquer la matière sur l'autre côté à l'aide d'une seconde buse (28a).
PCT/EP2003/006250 2002-06-15 2003-06-13 Procede et dispositif pour appliquer une matiere sur des fibres sechees servant a la production de panneaux de fibres Ceased WO2003106127A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003246427A AU2003246427A1 (en) 2002-06-15 2003-06-13 Method and device for applying a material to dried fibers that are used for producing fiber plates

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DE2002126820 DE10226820B3 (de) 2002-06-15 2002-06-15 Verfahren und Vorrichtung zum Beleimen von zur Herstellung von Faserplatten vorgesehenen, getrockneten Fasern
DE10226820.7 2002-06-15

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1537968A3 (fr) * 2003-12-02 2005-11-23 Dieffenbacher GmbH & Co. KG Procédé et installation pour encoller des fibres, et dispositif d'encollage de fibres
WO2007121842A1 (fr) * 2006-04-18 2007-11-01 Flakeboard Company Limited ProcÉdÉ et dispositif d'encollage de fibres séchÉes prÉvues pour la fabrication de plaques de fibres
DE102019204880A1 (de) * 2019-04-05 2020-10-08 Brav-O-Tech Gmbh Vorrichtung zum Benetzen von Partikeln
WO2024213239A1 (fr) 2023-04-12 2024-10-17 Sunds Fibertech Ab Appareil et procédé pour coller et mélanger des particules avec un adhésif
EP4464484A1 (fr) 2023-05-16 2024-11-20 Sunds Fibertech AB Dispositif pour coller et mélanger des particules avec un adhésif

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10336533A1 (de) * 2003-08-05 2005-02-24 Dieffenbacher Gmbh + Co. Kg Verfahren und Vorrichtung zum Benetzen von rieselförmigen Gütern mit einem Bindemittel
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
IT1399772B1 (it) 2010-04-30 2013-05-03 Imal Srl Apparato per l'iniezione di componenti chimici in un flusso di materiale legnoso incoerente
DE102016006499B3 (de) * 2016-05-28 2017-12-28 Fritz Schneider Verfahren und Vorrichtung zum Trocknen von zur Herstellung von Faserplatten vorgesehenen, mit Leim benetzten Fasern

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH275892A (fr) * 1948-12-22 1951-06-15 Hjalmar Granholm Johan Procédé pour disperser au moins une solution d'un liant sur une masse de matière, notamment de particules de bois, en vue de produire des objets comprimès, et appareil pour la mise en oeuvre de ce procédé.
DE2913081A1 (de) * 1979-04-02 1980-11-20 Novopan Kg Verfahren und vorrichtung zum beleimen von holzspaenen und anderen lignozellulosehaltigen partikeln
US4478896A (en) * 1982-11-15 1984-10-23 Macmillan, Bloedel Limited Apparatus for blending wood strands with a liquid resin
WO2002014038A1 (fr) * 2000-08-11 2002-02-21 Flakeboard Company Limited Procede et dispositif d'encollage de fibres sechees destinees a la fabrication de panneaux de fibres

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653223A1 (de) * 1966-04-23 1970-09-17 Himmelheber Dipl Ing Max Verfahren und Anlage zur Durchfuehrung der Benetzungsstufe bei der Verarbeitung von Fasermaterial
CH597926A5 (fr) * 1976-11-26 1978-04-14 Fahrni Peter
CH623241A5 (en) * 1977-09-10 1981-05-29 Fahrni Peter Apparatus for forming a rotationally symmetrical curtain of falling particles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH275892A (fr) * 1948-12-22 1951-06-15 Hjalmar Granholm Johan Procédé pour disperser au moins une solution d'un liant sur une masse de matière, notamment de particules de bois, en vue de produire des objets comprimès, et appareil pour la mise en oeuvre de ce procédé.
DE2913081A1 (de) * 1979-04-02 1980-11-20 Novopan Kg Verfahren und vorrichtung zum beleimen von holzspaenen und anderen lignozellulosehaltigen partikeln
US4478896A (en) * 1982-11-15 1984-10-23 Macmillan, Bloedel Limited Apparatus for blending wood strands with a liquid resin
WO2002014038A1 (fr) * 2000-08-11 2002-02-21 Flakeboard Company Limited Procede et dispositif d'encollage de fibres sechees destinees a la fabrication de panneaux de fibres

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1537968A3 (fr) * 2003-12-02 2005-11-23 Dieffenbacher GmbH & Co. KG Procédé et installation pour encoller des fibres, et dispositif d'encollage de fibres
WO2007121842A1 (fr) * 2006-04-18 2007-11-01 Flakeboard Company Limited ProcÉdÉ et dispositif d'encollage de fibres séchÉes prÉvues pour la fabrication de plaques de fibres
DE102019204880A1 (de) * 2019-04-05 2020-10-08 Brav-O-Tech Gmbh Vorrichtung zum Benetzen von Partikeln
WO2024213239A1 (fr) 2023-04-12 2024-10-17 Sunds Fibertech Ab Appareil et procédé pour coller et mélanger des particules avec un adhésif
EP4464484A1 (fr) 2023-05-16 2024-11-20 Sunds Fibertech AB Dispositif pour coller et mélanger des particules avec un adhésif
WO2024236086A1 (fr) 2023-05-16 2024-11-21 Sunds Fibertech Ab Appareil pour coller et mélanger des particules avec au moins un adhésif

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AU2003246427A1 (en) 2003-12-31

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