EP2018254B1 - Procédé et dispositif d'encollage de fibres séchées prévues pour la fabrication de plaques de fibres - Google Patents

Procédé et dispositif d'encollage de fibres séchées prévues pour la fabrication de plaques de fibres Download PDF

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Publication number
EP2018254B1
EP2018254B1 EP07724024.0A EP07724024A EP2018254B1 EP 2018254 B1 EP2018254 B1 EP 2018254B1 EP 07724024 A EP07724024 A EP 07724024A EP 2018254 B1 EP2018254 B1 EP 2018254B1
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EP
European Patent Office
Prior art keywords
fibers
pressure lines
fiber
air
stream
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EP07724024.0A
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German (de)
English (en)
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EP2018254A1 (fr
Inventor
Fritz Schneider
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Dieffenbacher GmbH Maschinen und Anlagenbau
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Dieffenbacher GmbH Maschinen und Anlagenbau
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0263—Mixing the material with binding agent by spraying the agent on the falling material, e.g. with the material sliding along an inclined surface, using rotating elements or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/029—Feeding; Proportioning; Controlling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material

Definitions

  • the invention relates to a method and a device for gluing provided for the production of fiberboard, dried fibers.
  • the fibers are preferably of lignocellulosic and / or cellulosic materials.
  • the fiberboards are lightweight, 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.
  • blow-line gluing has disadvantages. These are for example in the WO 02/14038 A1 described. The disadvantages of blow-line gluing can be avoided by gluing the fibers in the dry state.
  • the fibers are glued by means of at least one spray nozzle.
  • two symmetrically arranged opposite fiber streams may be provided, wherein the fiber streams after exiting the shaft section collide.
  • the spray nozzles can be aligned both laterally on the combined fiber flow as well as in a suction down from above on the two partial streams.
  • the fiber roll serves to transport the fibers, to remove nonuniformities such as fiber agglomerates, and at the same time to stretch the fiber stream due to acceleration of the fibers in the direction of flow.
  • the fibers settle in the curved shaft section before they emerge from this.
  • gluing devices are in the documents DE 102 47 412 A1 .
  • DE 102 47 413 A1 such as DE 102 47 414 A1 described.
  • a hollow fiber circular stream is generated in order to produce the largest possible surface available for gluing the fiber stream and to achieve the most uniform gluing of the fibers.
  • the fibers are glued in a chute or Faserabsaugrohr with vertical orientation and placed on a wire belt.
  • a jacket air stream can be provided, which surrounds the freshly glued fibers. The jacket air serves to prevent caking on the walls of the chute.
  • the DE 102 47 413 A1 discloses in Figure 9, two in series Beleimungsakuen with alternately exchangeable chute or suction tube. That is, while a gluing unit is in use, the disused gluing unit may be subjected to cleaning. Of the Fiber flow is switched by two changeover to one or the other gluing unit.
  • the invention is therefore based on the object to provide an effective and not expensive process of the type mentioned. Furthermore, the invention has for its object to provide an associated device.
  • the object concerning the method is solved by the features of claim 1.
  • the fibers are fed from a fiber metering device of a transport device.
  • the transport device has at least two pressure lines. In these pressure lines is generated by at least one fan, which is arranged between a discharge of the metering device and a respective outlet opening of the pressure lines, pneumatic pressure. Preferably, a fan is provided for each pressure line.
  • the fibers are transported to Beleimungssprühdüsen.
  • the fibers are at least partially guided in two separate partial fiber streams and exit in the form of two partial streams from outlet openings of the pressure lines. It can be provided that a plurality of pressure lines have a common outlet opening.
  • the exiting partial flows are shallow partial flows, ie they have a relatively large width in relation to the thickness.
  • the partial streams emerging from the pressure lines are arranged so that they meet at an angle of less than 180 ° and combine to form a fiber stream.
  • this angular arrangement of the two juxtaposed partial flows referred to as V-shape, although the two partial flows after exiting the respective pressure line do not have to have a straight course, but may be slightly curved and although the angle may be significantly larger or smaller than the legs of a "V".
  • the two partial streams after leaving the respective pressure line have a substantially straight course, and the angle between the colliding partial streams may in particular be 45 ° to 135 °. Preferably, the angle is 50 ° to 110 °.
  • the fibers are glued with at least one gluing spray nozzle directed at the partial flow inner surfaces, that is, the two opposite surfaces of the V-shape, between the exit from the pressure lines and the merging into a stream.
  • the fibers of each broad side of the fiber stream are glued with in each case at least one gluing spray nozzle.
  • the fibers of the combined fiber stream are sucked off. This can be done in particular by means of a further fan.
  • a row of gluing spray nozzles arranged across the width can be provided in each case.
  • the pressure lines are at least substantially closed except for respective inlet openings and the outlet openings.
  • the direction of the extracted combined fiber stream need not be vertical, but is arbitrary.
  • the direction of the combined fiber flow thus does not depend in particular on the gravitational force.
  • the fiber stream being based on air flow, may e.g. be sucked up too.
  • a corresponding gluing unit can be installed in such an angular position that the freshly glued fibers of the combined fiber stream do not have to be deflected on the first path immediately after gluing, where the fibers still have the highest degree of cold tack, as a result of which gluing of the freshly glued leaves Fibers can be prevented on the walls of a transport device.
  • the fibers are subjected to an air-fiber direction on the way from the metering device to the glueing by means of the glue spray nozzles.
  • coarse wood particles sino-called "shives”
  • shives coarse wood particles
  • Such irregularities lead to defects in the fiber board to be produced and can thus lead to plate rejection.
  • the air-fiber separator is integrated into the process so that no additional fiber metering device and no additional pneumatic transport device for the air-fiber direction are required.
  • the fibers pass from a metering device first for sighting and then for gluing, and it can take place after the gluing an extraction in a uniform pneumatic transport device.
  • the Sighting of the fibers substantially immediately after leaving the at least one metering instead.
  • the sighting may in particular be a sighting, as in the WO 01/89783 A1 , is described.
  • the fibers are fed through a shaft, which may in particular be a discharge shaft of the metering device, to an opening roller which is provided on its surface with a large number of pins and rotated in such a way that the fibers are deflected by the pins.
  • a shaft which may in particular be a discharge shaft of the metering device
  • the fibers are guided in a thin film substantially along a shaft section delimited by a partial section of the circumference of the opening roller and an opposite wall, with the fiber flow diverging, before they emerge essentially horizontally at an outlet opening of the shaft section. Subsequently, the fibers pass into a downwardly directed airflow generated by negative pressure.
  • the air stream ruptures fibers which are isolated as desired and thus have a relatively low weight as particles, while impurities in the form of coarse material are fed by the gravitational force to a coarse material discharge. It may also be provided instead of the downward air flow, an upward air flow. Preferably, it is provided that the fibers undergo a curvature of the respective pressure line before they emerge from this.
  • the curvature is arranged in the flow direction so that the fibers emerge compressed from the pressure line by applying by centrifugal force to a relation to the curvature outer wall of the pressure line. In this way, the fiber stream can be compressed to a very thin fiber stream, which is thin, for example, a few millimeters.
  • the curvature may in particular have the shape of a partial circle.
  • the centrifugal force acting in the curvature also causes a separation of transport air and fibers, so that essentially flows on the inner wall relative to the curvature of the transport air.
  • This airflow can after the exit be used from the pressure lines to protect inner surfaces of a wall of a collecting shaft in which the combined fiber stream is guided, before contact with freshly glued fibers.
  • a single fiber metering device is used and a fiber stream, which is discharged from the metering device, divided into the two partial streams.
  • the effort is kept low, for example, compared to the known device according to WO 02/14038 A1 in which two metering devices are provided.
  • the speed of the fibers emerging from the pressure lines can be adjusted by means of a variable speed of the at least one fan which generates the pressure in the pressure lines.
  • the speed of the exiting fibers may be in particular 10-100 m / s and preferably 40 m / s.
  • the fiber density of the partial streams is controlled by the fiber speed.
  • the fiber velocity is set as a function of a defined amount of fiber discharged per unit of time from the at least one metering device in order to keep the fiber density constant at a desired value. If a bend in the pressure lines is provided, the control is related to the fiber density before the curve.
  • the spray nozzles which are directed onto a surface of the combined fiber flow, flows around in the spraying direction of air, which serves for the extraction of the combined fiber flow.
  • the sucked air has substantially the same flow direction as the gluing spray. This effectively prevents backflow of the spray and associated contamination of the nozzles. It can be provided that the flow rate of the intake air can be adjusted by changing a free cross-section of a suction duct in which the gluing nozzles are arranged.
  • the at least one spray nozzle which is directed to the inner surfaces of the partial flows between the escape from the pressure lines and the merging into a fiber stream, is preferably flows in the direction of spray of air, which serves for the extraction of the combined fiber stream, wherein the sucked air to prevent a Backflow of the gluing spray has substantially the same flow direction as the spray.
  • the air In the sucked air may be hot or hot air, the air is preferably sucked through intake ducts. Also, the guided through the pressure lines air can be heated accordingly.
  • the warm or hot air ensures rapid surface drying of the glue droplets of the glue mist in its expanded form, whereby a cold tack of the glue is reduced. In this way, caking freshly glued fibers on the inner walls of a corresponding gluing device can be prevented. In particular, in this way caking of glue in shafts in which the spray nozzles are arranged avoided.
  • the air drawn in, preferably through the intake ducts, should only have a certain maximum temperature in order to avoid glue hardening within the spray nozzles. Because the inner walls of the spray nozzles heat up to the operating temperature of the air. For example, the intake air can only have a temperature of approximately 50 ° C., since glue hardening within the spray nozzles can occur at higher temperatures.
  • the temperature of the air passing through the pressure lines may be higher than the above-mentioned maximum temperature, for example higher than 50 ° C, because the air leaving the pressure lines together with the still unwished fibers does not come into contact with the spray nozzles , Because the degree of drying of the glue mist is directly related to is the air temperature, it is desirable to work with the highest possible temperatures exiting the pressure lines air.
  • the - preferably through the intake duct or the intake ducts - sucked air has a lower temperature than the air emerging from the outlet openings of the pressure lines.
  • the spray nozzles may be liquid pressure nozzles. Such nozzles spray glue by pressurizing. Alternatively, however, liquid-air atomizing nozzles can also be used. In these nozzles, the glue is atomized by air.
  • the above object is achieved with respect to the device by the features of claim 8.
  • the method can be carried out with the device.
  • the device has at least one metering device for fibers.
  • a transport device is provided, which serves to transport discharged from the metering device fibers to Beleimungsffenn.
  • the transport device has at least two pressure lines, in which pneumatic pressure is generated by means of a fan.
  • the fan is arranged between a discharge of the metering device and a respective outlet opening of the pressure lines. At least two pressure lines are provided at least over a certain distance, in which separate partial fiber streams are guided.
  • Two partial fiber streams emerge at outlet openings of the pressure lines as a flat partial flow in such a way that the two partial flows meet at an angle of less than 180 ° and combine to form a fiber stream.
  • a fan is provided for each pressure line. This fan may in particular be a medium to high pressure fan.
  • the pressure lines are at least substantially to the respective inlet openings and the outlet openings closed. It can be provided that a plurality of pressure lines share a common outlet opening.
  • the sizing means comprise at least one spray nozzle directed towards the inner surfaces of the sub-streams between exit from the pressure lines and merging into a stream.
  • the gluing means have on both sides of the combined fiber stream at least one gluing spray nozzle. These spray nozzles are directed to the broad sides of the combined fiber stream. In general, a plurality of juxtaposed spray nozzles are provided over the width of the fiber stream in each case. As spray nozzles, which are directed onto the inner surfaces of the partial flows, separate spray nozzles are preferably provided for each of the two opposite inner surfaces.
  • the device comprises means for sucking off the fibers of the combined fiber stream. These means may in particular comprise a fan which generates a negative pressure in a suction duct through which the combined fiber stream is guided.
  • the device has substantially the same advantages as previously described in connection with the method. This also applies to the preferred embodiments of the device described below.
  • an air-fiber separator is arranged between the at least one fiber metering device and the gluing means.
  • the air-fiber separator can, in particular, be connected substantially directly to the at least one metering device or arranged adjacent to it.
  • the air-fiber separator may in particular be a classifier, as in the WO 01/89783 A1 is described.
  • a feed chute which may in particular be a discharge chute of the metering device, extends from a discharge of the metering device to an opening roller.
  • the opening roller has a plurality of pins on its surface and is rotatable so that incident fibers are deflected by the pins.
  • a chute section delimited by a partial section of the roll periphery and an opposite wall extends from an outlet of the feed chute in the direction of rotation of the opening roller.
  • An exit opening of the chute section is arranged such that the fibers emerge substantially horizontally in an expanded fiber stream into an air passageway which carries a downwardly or upwardly directed airflow created by vacuum.
  • a coarse material discharge shaft which has an inlet that is opposite the outlet opening of the shaft section and a coarse material outlet arranged below the inlet, is connected to the air channel.
  • the fiber stream is pulled apart by the opening roller due to acceleration, which improves the visual effect.
  • the opening roller is preferably adjustable in its speed. As a result, the speed with which fibers are ejected from the shaft section can be varied, which influences the parcel trajectory, in particular of the large parts, which should reach the coarse material shaft during the visual process.
  • the pressure lines each have a curvature which is arranged near the respective outlet opening of the pressure line.
  • the curvature is designed in the direction of flow such that the fibers due to centrifugal force to create a relation to the curvature outer wall of the pressure line and thereby compressed out of the pressure lines exit.
  • the curvature may in particular have the shape of a partial circle. It could also be provided that the fibers after passing through the curvature still a relatively short travel straight along the outer wall before exiting the exit opening.
  • a collecting shaft, in which the partial flows unite, and the outlet openings of the pressure lines can be arranged to each other that air, which moves along an inner wall by the curvature of the pressure lines, after emerging from the pressure lines between the combined fiber flow and Wandinneninnen vom the Manhole moves.
  • the inner surfaces of the collecting shaft can be protected from contamination by the freshly glued fibers.
  • the fibers are discharged from a single metering device and a material divider divides the exiting fiber stream into the partial streams.
  • the material divider may be located in a discharge chute of the metering device. If a single fiber separator is provided, the material divider is preferably located adjacent to the viewing process in the air channel of the fiber separator or downstream of the fiber separator.
  • the pressure lines may be formed in the region of their respective outlet opening as a flat jet nozzle.
  • the curvature described above may be part of the flat jet nozzle, so that the respective pressure line tapers approximately in the transition region to the curvature in cross section. It can be provided that a plurality of pressure lines have a common flat jet nozzle. The outlet opening of the flat jet nozzle is then a common outlet opening of the associated pressure lines.
  • the speed of the at least one fan for pressure generation in the pressure lines is variable, preferably continuously. In this way, the speed of emerging from the pressure lines fibers can be adjusted.
  • the fiber density in the Beleimungszone be set.
  • the amount of fiber discharged from the metering device per unit of time can be predetermined in particular by means of a gravimetric metering, in which a weighing device is used.
  • a regulation can take place in which the fiber speed is changed as a function of the known amount of fiber discharged from the metering device.
  • the control can relate to the fiber density of the partial flows before the curvatures.
  • the at least one spray nozzle which faces a surface extending across the width of the combined fiber stream, is disposed within a respective intake duct. Air is drawn in through the intake shaft, which serves to extract the fibers of the combined fiber stream.
  • the spray nozzles are aligned so that the spray direction substantially coincides with the direction of the air flow.
  • the flow velocity of the air flowing through the two laterally arranged intake ducts can be adjustable in that a free cross-section of the respective intake duct is changeable.
  • the at least one spray nozzle which are directed onto the inner surfaces of the partial flows, is preferably also arranged in a further suction duct so that it is surrounded by air for suction of the combined fiber flow and is oriented substantially in the flow direction.
  • Means can be provided for heating the air flowing through the intake ducts. These means may in particular be a heat exchanger or an air heater. These heating means may also be provided to heat the air flowing into the metering device.
  • these means which in turn may in particular be a heat exchanger or an air heater, preferably designed so that the emerging from the pressure lines air can be heated to a higher temperature than the temperature of the intake duct or the intake ducts flowing air.
  • the spray nozzles may be liquid pressure nozzles or liquid-air atomizing nozzles.
  • the enclosure of the gluing device is dimensioned such that the fiber streams have a distance from the walls which prevents fiber contact from occurring with the walls.
  • the gluing device according to Fig. 1 has a dosing bunker 1.
  • the dosing hopper 1 has an inlet 2 for filling with dried wood fibers 3 according to arrow 37.
  • the fibers 3 are fed to a discharge 4 with discharge rollers 4a.
  • the discharge rollers 4a larger clumps of the fibers 3 are dissolved.
  • the bottom band 29 passes over a weighing device 5, which continuously detects the current fiber throughput weight (weight per unit time).
  • the metering device 1 has an air supply 7.
  • a fan 9 is arranged, which supplies heated air by means of an air heater 10.
  • the fibers 3 pass through a discharge chute 11 of the metering device 1 as a fiber stream 6 to the direction of an air-fiber separator 70.
  • an opening roller 72 In the region of an outlet 71 of the discharge chute 11 of the fiber stream 6 strikes an opening roller 72, on the surface of a plurality of pins 73 is arranged , The pins 73 taper with increasing distance to the axis of rotation of the opening roller 72 conically to a point.
  • the opening roller can rotate at about 1000 rpm.
  • the speed of the opening roller 72 is adjustable so that it can adapt to different materials to be dissolved.
  • the fiber stream 6 is deflected by the pins 73 in a shaft section 74.
  • the shaft section 74 is delimited by a partial section of the opening roller circumference and a wall 75.
  • the shaft section 74 extends approximately from the outlet 71 to the lowest point of the opening roller 72 and has an outlet opening 76 there.
  • the outlet opening 76 of the shaft section 74 opens into an air channel 77 of the fiber separator 70.
  • air is supplied via an air supply 78, the amount of which can be regulated by means of an air supply slide, not shown.
  • an inlet 79 of a coarse material discharge shaft 80 is arranged.
  • the size of the inlet 79 may be adjustable by an adjustable slider (not shown).
  • the coarse material discharge shaft 80 extends substantially in the vertical direction and has a coarse material discharge 81 at its lower end.
  • a material divider 12 Downstream of the fiber separator 70, a material divider 12 is arranged in the air channel 77.
  • the material divider 12 opens into two suction lines 13 and 14. These go into pressure lines 15 and 16, with a respective fan 17 and 18 is arranged therebetween.
  • the parallel-connected fans 17, 18 may in particular be medium to high-pressure fans.
  • the pressure lines 15, 16, which serve to transport fibers in partial flows 19 and 20, have a completely closed wall and are formed at their outlet end as a flat jet nozzle 21 and 22 respectively.
  • the flat jet nozzles 21, 22 have at a respective outlet a part-circular curvature 23 and 24.
  • the curvature 23 and 24 causes the fibers create by centrifugal force to an outer curvature 25 and 26, ie on the wall, the flat fan nozzle 21, 22 limited over their width at the larger radius of curvature. As a result, the fibers each compact to a thin fiber partial flow 27 and 28.
  • the outlet width of the flat jet nozzles 21, 22 is arbitrary. It depends on the desired fiber throughput.
  • the flat jet nozzles 21, 22 open with an outlet opening 31 or 32 in a collecting shaft 33.
  • the collecting shaft 33 has walls 43 and 44, which adjoin the outlet openings 31, 32 directly in the flow direction.
  • the collecting shaft 33 passes into a suction duct 34, which has a larger cross-section than the collecting shaft 33.
  • In the transition region between the collecting shaft 33 and the suction duct 34 respectively opens a suction duct 35 and 36th
  • Walls 38 and 39 of the intake duct 35 and walls 40th and 41 of the intake duct 36 are adjustable to change the free cross section of the respective intake duct 35, 36.
  • a further intake shaft 42 adjoins the collecting shaft 33, adjacent to the flow direction, adjacent to the outlet openings 31, 32.
  • the thin fiber partial flows 27, 28 meet in the collecting shaft 33 in a V-shaped manner and combine to form a fiber stream 45.
  • a series of gluing spray nozzles 46 are aligned over the width of the partial flow 27, aligned with the partial flow 27. Accordingly, a series of spray nozzles 47 is arranged aligned with the partial flow 28 over its width. Further, over the width of the combined fiber stream 45, a series of spray nozzles 48 are arranged, which are directed onto a surface of the fiber stream 45. Opposite a number of other spray nozzles 49 is arranged, which are directed to the opposite surface of the fiber stream 45. The spray nozzles 48, 49 are located in the areas where the intake ducts 35, 36 open into the suction duct 34.
  • Air which has been sucked in by suction means 57 and heated by means of the air heater 10 is supplied via an air line 52, in which a further fan 53 is arranged, and via further air lines 54, 55 and 56 to the suction ducts 35, 42 and 36, respectively.
  • a fan between the suction means 57 and the air heater 10 could be provided.
  • a Faserabsaugrohr 88 connects, which leads to a cyclone 89 with a rotary valve 93.
  • a powerful fan 51 is arranged in a line 90 for exhaust air of the cyclone 89.
  • Cyclone exhaust air is usually fed to an air filter (not shown).
  • Part of the exhaust air of the cyclone 89 can be supplied via an air line 91 as intake air to the fiber separator 70, in addition to air as indicated by arrow 92.
  • the exhaust air, not shown by the air filter which still has a residual heat from the process, can at least partially as intake air the heat exchanger 10 are supplied (not shown).
  • Fig. 2 is the in Fig. 1 designated by the reference numeral 58 coarse area in which the gluing takes place, shown in more detail. The fibers are not shown.
  • An entire forward end wall region of the intake duct 42, the collection duct 33, the intake ducts 35, 36 and the exhaust duct 34 are designated by the reference numeral 60. Of the opposite end wall region is designated 61.
  • the width of the flat jet nozzles 21, 22 is smaller than the width of the suction ducts 42, 35, 36 and the collecting shaft 33 and the suction duct 34. In this way it can be achieved that freshly glued fibers or glue in contact with the Walls of the said shafts come.
  • the described gluing device is based on the following mode of operation:
  • the fiber stream 6 metered in and guided by the opening roller 72 is accelerated by the opening roller 72 and thereby pulled apart. Impurities and irregularities, in particular coarse wood particles, are mainly dissolved or reduced.
  • the fibers enter the air channel 77.
  • Lightweight normal material 83 ie average single fibers, describe a short parcel of parcels after exiting the shaft section 74 due to their relatively low kinetic energy, and then move downstream from the air flow in the air channel 77 to be taken downstairs.
  • Coarse material 84 which is heavier than the normal 83, describes by its higher kinetic energy a longer throw parabola and thus passes into the Grobgutaustragsschacht 80. Heavy parts of the coarse material 84 fall into the Grobgutaustrag 81st
  • the fibers discharged from the fiber separator 70 as normal material 83 are fed pneumatically through the pressure lines 15, 16 to the gluing area 58 under pressure by means of the fans 17, 18.
  • the pressure lines 15, 16 are closed except for the outlet openings 31, 32 of the flat jet nozzles 21, 22.
  • the speed with which the fibers emerge from the flat jet nozzles 21, 22 is adjustable by way of a variable speed of the fans 17, 18.
  • the speed is preferably set in such a regulated manner that the density of the partial fiber streams 19, 20 before passing through the curves 23, 24 is constant.
  • the weighing device 5 gravimetrically measured the amount of discharged from the metering device 1 fibers.
  • the opposite inner surfaces of the fiber sub-streams 27, 28 are wetted by the spray nozzles 46, 47 with glue.
  • the combined fiber stream 45 is wetted at its broad sides by means of the spray nozzles 48, 49 with glue.
  • Both the spray nozzles 46, 47 and the spray nozzles 48, 49 are flowed around by warm intake air from the air lines 54, 55 and 56, respectively.
  • the advantages of the flow-through or the spray-drying of the glue mist due to the warm air in the intake ducts 35, 42, 36 have been described above.
  • the spray nozzles 46-49 are liquid pressure nozzles or liquid-air atomizer nozzles.
  • the spray nozzles 46-49 are each aligned substantially in the flow direction of the sucked air.
  • the gluing device according to the Fig. 1 and 2 is intended for fiber capacities that can be handled by a single metering device and a single fiber separator upstream of dry glueing.
  • a gluing device with two metering devices and two air-fiber separators can also be used. In such a gluing device, the material divider 12 is eliminated.
  • a material divider 12 ' is arranged, which opens into four intake pipes 13, 14, 13' and 14 '. These pass into pressure lines 15, 16, 15 'and 16', with a respective fan 17, 18, 17 'and 18' arranged therebetween.
  • the two pressure lines 15, 16 are formed at their common outlet end as a flat jet nozzle 21 and the pressure lines 15 'and 16' at its common outlet end as a flat jet nozzle 22.
  • FIG. 4 shown further embodiment of a gluing device according to the invention are compared with the gluing device according to the Fig. 1 and 2 same features provided with the same reference numerals.
  • the gluing device according to Fig. 4 differs from the gluing device according to the Fig. 1 and 2 in that further suction means 57 'and a further air heater 10' are provided.
  • the suction means 57 and the air heater 10 provide in this embodiment only for the warm intake air, which is guided through the air ducts 54, 55 and 56, respectively.
  • the air passing through the fan 9 in the air supply 8 of the Metering device 1 and the air channel 77 is supplied, however, is sucked by the suction means 57 'and heated by means of the air heater 10'.
  • the air heater 10 is designed so that the air flowing around the spray nozzles 46-49 has a temperature of, for example, a maximum of 50 ° C.
  • the air heater 10 ' is such that it more strongly heats the air supplied to the metering device 1 or the air duct 77, so that the air emerging from the flat jet nozzles 21, 22 has a higher temperature than, for example, 50.degree.
  • the exhaust air from the cyclone 89 conducted through the air filter could be at least partially supplied as an intake air to the heat exchanger 10 as well as the heat exchanger 10 '(not shown).
  • the device differs according to Fig. 4 not from the device according to the Fig. 1 and 2 ,

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (15)

  1. Procédé pour l'encollage de fibres séchées destinées à la fabrication de panneaux de fibres,
    dans lequel les fibres (3) sont transportées à partir d'au moins un dispositif de dosage de fibres (1) par un dispositif de transport muni d'au moins deux conduites sous pression (15, 15', 16, 16'), dans lesquelles une pression pneumatique est produite par au moins un ventilateur (17, 17', 18, 18'), de telle manière que les fibres sortent en deux flux partiels de fibres séparés (27, 28) par des ouvertures de sortie (31, 32) des conduites sous pression (15, 15', 16, 16'),
    dans lequel l'au moins un ventilateur (17, 17', 18, 18') est disposé entre une sortie (4) de l'au moins un dispositif de dosage (1) et une des ouvertures de sortie (31, 32) des conduites sous pression (15, 15', 16, 16'),
    dans lequel les fibres sortent sous la forme d'un flux partiel plat (27, 28) des conduites sous pression (15, 15', 16, 16') de telle manière que les deux flux partiels (27, 28) se rejoignent sous un angle inférieur à 180° et se réunissent pour former un flux de fibres (45),
    dans lequel les fibres sont ensuite encollées avec au moins une buse de pulvérisation de colle (46, 47) dirigée vers les surfaces intérieures des flux partiels (27, 28) entre la sortie des conduites sous pression (15, 15', 16, 16') et la réunion en un flux de fibres (45) et avec au moins une buse de pulvérisation de colle (48, 49) dirigée vers chacune de deux surfaces du flux de fibres réuni (45) qui s'étendent sur la largeur du flux de fibres
    et dans lequel les fibres du flux de fibres réuni (45) sont aspirées.
  2. Procédé selon la revendication 1, caractérisé en ce que les fibres parcourent un coude (23, 24) de chacune des conduites sous pression (15, 15', 16, 16') de telle sorte que les fibres (27, 28) s'appliquent sur une paroi extérieure (25, 26) des conduites sous pression (15, 15', 16, 16') sous l'effet de la force centrifuge et sont ainsi compactées lorsqu'elles sortent des conduites sous pression (15, 15', 16, 16').
  3. Procédé selon la revendication 2, caractérisé en ce que l'air (64, 65) qui circule le long d'une paroi intérieure (62, 63) à travers le coude (23, 24) des conduites sous pression (15, 15', 16, 16') est utilisé, après sa sortie des conduites sous pression (15, 15', 16, 16'), pour protéger les surfaces intérieures des parois (43, 44) d'une gaine de regroupement (33), dans laquelle le flux de fibres réuni (45) est guidé, du contact avec les fibres encollées (27, 28, 45).
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la vitesse des fibres (27, 28) sortant des conduites sous pression (15, 15', 16, 16') peut être réglée au moyen d'une vitesse de rotation variable de l'au moins un ventilateur (17, 17', 18, 18').
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'au moins une buse de pulvérisation (48, 49) dirigée vers une surface du flux de fibres réuni (45) est parcourue dans le sens de pulvérisation par de l'air aspiré en vue de l'aspiration du flux de fibres réuni (45).
  6. Procédé selon la revendication 5, caractérisé en ce que la vitesse d'écoulement de l'air aspiré peut être réglée par la modification d'une section libre d'une gaine d'aspiration (35, 36) à travers laquelle l'air est guidé.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'au moins une buse de pulvérisation (46, 47) dirigée vers les surfaces intérieures des flux partiels (27, 28) est parcourue par de l'air aspiré dans le sens de pulvérisation en vue de l'aspiration du flux de fibres réuni (45).
  8. Dispositif pour l'encollage de fibres séchées destinées à la fabrication de panneaux de fibres, comprenant
    - au moins un dispositif de dosage de fibres (1),
    - un dispositif de transport qui sert au transport pneumatique des fibres (3) sortant de l'au moins un dispositif de dosage (1) jusqu'à des moyens d'encollage (46-49) et qui présente au moins deux conduites sous pression (15, 15', 16, 16') conçues de telle manière que les fibres sortent en deux flux partiels de fibres séparés (27, 28) par des ouvertures de sortie (31, 32) des conduites sous pression (15, 15', 16, 16'),
    au moins un ventilateur (17, 17', 18, 18') étant disposé, afin de produire la pression pneumatique, entre une sortie (4) de l'au moins un dispositif de dosage (1) et une des ouvertures de sortie (31, 32) des conduites sous pression (15, 15', 16, 16'),
    les fibres sortant sous la forme d'un flux partiel plat (27, 28) des conduites sous pression (15, 15', 16, 16') par l'ouverture de sortie (31, 32) correspondante de telle manière que les deux flux partiels (27, 28) se rejoignent sous un angle inférieur à 180° et se réunissent pour former un flux de fibres (45),
    et les moyens d'encollage (46, 49) comprenant au moins une buse de pulvérisation de colle (46, 47) dirigée vers les surfaces intérieures des flux partiels (27, 28) entre la sortie des conduites sous pression (15, 15', 16, 16') et la réunion en un flux de fibres (45) et au moins une buse de pulvérisation de colle (48, 49) dirigée vers chacune de deux surfaces du flux de fibres réuni (45) qui s'étendent sur la largeur du flux de fibres,
    - des moyens (33-36, 42, 51) pour aspirer les fibres du flux de fibres réuni (45).
  9. Dispositif selon la revendication 8, caractérisé en ce que les conduites sous pression (15, 15', 16, 16') présentent chacune un coude (23, 24) disposé au voisinage de l'ouverture de sortie (31, 32) de la conduite sous pression (15, 15', 16, 16') de telle sorte que les fibres (27, 28) s'appliquent sur une paroi extérieure (25, 26) des conduites sous pression (15, 15', 16, 16') sous l'effet de la force centrifuge et sont ainsi compactées lorsqu'elles sortent des conduites sous pression (15, 15', 16, 16').
  10. Dispositif selon la revendication 9, caractérisé en ce qu'une gaine de regroupement (33) prévue pour guider le flux de fibres réuni (45) et les ouvertures de sortie (31, 32) des conduites sous pression (15, 15', 16, 16') sont disposées l'une par rapport aux autres de telle manière que l'air (64, 65) qui circule le long d'une paroi intérieure (62, 63) à travers le coude (23, 24) des conduites sous pression (15, 15', 16, 16') passe, après sa sortie des conduites sous pression (15, 15', 16, 16'), entre le flux de fibres réuni (45) et les faces intérieures des parois de la gaine de regroupement (43, 44).
  11. Dispositif selon l'une des parois 8 à 10, caractérisé en ce que les conduites sous pression (15, 15', 16, 16') sont conformées comme une buse à jet plat (21, 22) au niveau de leur ouverture de sortie (31, 32).
  12. Dispositif selon l'une des parois 8 à 11, caractérisé en ce que la vitesse de rotation de l'au moins un ventilateur (17, 17', 18, 18') peut être modifiée afin de pouvoir ajuster la vitesse des fibres (27, 28) sortant des conduites sous pression (15, 15', 16, 16').
  13. Dispositif selon l'une des parois 8 à 12, caractérisé en ce que l'au moins une buse de pulvérisation (48, 49) dirigée vers une surface du flux de fibres réuni (45) est disposée à l'intérieur d'une gaine d'aspiration (35, 36) correspondante à travers laquelle passe l'air servant à l'aspiration des fibres du flux de fibres réuni (45), la direction de pulvérisation coïncidant sensiblement avec la direction du flux d'air.
  14. Dispositif selon la revendication 13, caractérisé en ce qu'une section libre de la gaine d'aspiration (35, 36) peut être modifiée afin d'ajuster la vitesse d'écoulement de l'air aspiré.
  15. Dispositif selon l'une des parois 8 à 14, caractérisé en ce que l'au moins une buse de pulvérisation (46, 47) dirigée vers les surfaces intérieures du flux partiel (27, 28) est disposée à l'intérieur d'une gaine d'aspiration (42) à travers laquelle circule de l'air servant à aspirer les fibres du flux de fibres réuni (45), la direction de pulvérisation coïncidant sensiblement avec la direction du flux d'air.
EP07724024.0A 2006-04-18 2007-04-05 Procédé et dispositif d'encollage de fibres séchées prévues pour la fabrication de plaques de fibres Not-in-force EP2018254B1 (fr)

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DE102006018103 2006-04-18
DE102006040044A DE102006040044B3 (de) 2006-04-18 2006-08-26 Verfahren und Vorrichtung zum Beleimen von zur Herstellung von Faserplatten vorgesehenen, getrockneten Fasern
PCT/EP2007/003083 WO2007121842A1 (fr) 2006-04-18 2007-04-05 ProcÉdÉ et dispositif d'encollage de fibres séchÉes prÉvues pour la fabrication de plaques de fibres

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EP2018254B1 true EP2018254B1 (fr) 2018-01-03

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DE102011106211B4 (de) * 2011-06-07 2014-05-22 Fritz Egger Gmbh & Co. Og Vorrichtung und verfahren zur benetzung von holzpartikeln
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
DE102016010539B3 (de) * 2016-05-28 2017-05-04 Fritz Schneider Verfahren und Vorrichtung zum Beleimen von zur Herstellung von Faserplatten vorgesehenen, getrockneten Fasern
DE102017103460A1 (de) * 2017-02-20 2018-08-23 Dieffenbacher GmbH Maschinen- und Anlagenbau Steuervorrichtung und -verfahren zum Dosieren eines Bindemittels, eine Einbringvorrichtung und -verfahren zum Einbringen eines Bindemittels in einen Materialstrom sowie ein System zur Herstellung von Werkstoffplatten
DE102017103458B4 (de) 2017-02-20 2019-05-29 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung und Verfahren zum Benetzen eines Materialstroms mit einem Bindemittel und einem System zur Herstellung von Werkstoffplatten
DE202017100934U1 (de) 2017-02-20 2018-03-21 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zum Benetzen eines Materialstroms mit einem Bindemittel und einem System zur Herstellung von Werkstoffplatten
DE102018112266A1 (de) * 2017-05-22 2018-11-22 Dieffenbacher GmbH Maschinen- und Anlagenbau Beleimungseinrichtung zum beleimen von partikeln, vorrichtung einer oder für eine anlage zur herstellung von pressplatten, verfahren zur verhinderung von ablagerung von leim und/oder partikeln und verfahren zum beleimen von partikeln
CN114809536B (zh) * 2022-04-11 2024-01-26 广东博智林机器人有限公司 涂敷机器人
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EP2018254A1 (fr) 2009-01-28
WO2007121842A1 (fr) 2007-11-01
DE102006040044B3 (de) 2007-06-06
WO2007121842A8 (fr) 2008-11-13

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