WO1999014023A1 - Procede d'enduction de fibres a la colle - Google Patents

Procede d'enduction de fibres a la colle Download PDF

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Publication number
WO1999014023A1
WO1999014023A1 PCT/DE1998/002736 DE9802736W WO9914023A1 WO 1999014023 A1 WO1999014023 A1 WO 1999014023A1 DE 9802736 W DE9802736 W DE 9802736W WO 9914023 A1 WO9914023 A1 WO 9914023A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibers
fiber
tower
glue
gluing
Prior art date
Application number
PCT/DE1998/002736
Other languages
German (de)
English (en)
Inventor
Andreas Michanickl
Christian Boehme
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7842503&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1999014023(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority to AT98954176T priority Critical patent/ATE211960T1/de
Priority to AU11423/99A priority patent/AU732714B2/en
Priority to EP98954176A priority patent/EP1017550B1/fr
Priority to BR9812455-2A priority patent/BR9812455A/pt
Priority to JP2000511619A priority patent/JP2001516657A/ja
Priority to DE29880083U priority patent/DE29880083U1/de
Priority to CA002304232A priority patent/CA2304232A1/fr
Priority to DE59802663T priority patent/DE59802663D1/de
Priority to NZ502760A priority patent/NZ502760A/en
Publication of WO1999014023A1 publication Critical patent/WO1999014023A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0263—Mixing the material with binding agent by spraying the agent on the falling material, e.g. with the material sliding along an inclined surface, using rotating elements or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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

Definitions

  • the invention relates to a method for gluing fibers, in which the glue is applied to fibers with a fiber moisture below 100% and in which fiber agglomerates that are present after gluing are then dissolved again.
  • the invention further relates to a device for carrying out the method and a method for controlling the gluing of fibers.
  • fibers are used to refer to all lignocellulose-containing fibers which are used in particular for the production of wood-based materials.
  • Typical fibers are those that are produced from wood chips or from annual plants, from palms or grasses according to the RMP (Refiner Mechanical Pulping), TMP (Thermomechanical Pulping) or CTMP (Chemo-Thermomechanical Pulping) process, but also by chemical ones Wood pulp produced fibers are included here.
  • the glued fibers can preferably be used for the production of wood-based materials - they are particularly suitable for the production of fiberboard.
  • a typical, but far from the only example is the use of glued ligocellulosic fibers for the production of MDF boards (medium density fibreboards).
  • Fibers used in the manufacture of wood-based materials are made from wood-soaked wood chips. Before gluing, the fibers must be dried to a fiber moisture (water mass based on absolutely dry fiber mass) below 100%, preferably between 1 and 10 V, to ensure permanent gluing and to prevent so-called steam bursts, these are cracks and disturbances in the fiber structure of the Wood material that is created by steam bubbles that are created during gluing.
  • a fiber moisture water mass based on absolutely dry fiber mass
  • fibers with a fiber moisture are subsequently designated below 100%. However, it is particularly preferred to use fibers with a fiber moisture content of between 1 and 10%.
  • glue based on the absolutely dry fiber mass, is added to the fiber mass.
  • Various synthetic resins are used as glues, frequently for example phenol-formaldehyde, mela- in-formaldehyde or, if no waterproof gluing is required, urea-formaldehyde.
  • glue is used to refer to all natural glues and synthetic resins that are applied to lignocellulose-containing fibers in order to produce wood-based materials.
  • So-called "blow-line” gluing is carried out today in the production of medium-density fiberboard (MDF). Fibers are mixed with the glue in the so-called “blow line” immediately after they have been produced in the refiner at high temperatures and high pressure. The gluing takes place by injecting the glue into the blow line.
  • the blow line is located between the refiner and a fiber dryer. Due to the pressure difference between the refiner and the fiber dryer, the still moist and very hot fibers shoot through the blow line at a speed of 200 to over 450 m / s. The resulting turbulence in the blow line causes the injected glue to mix with the fibers and thereby glue to the fibers. This happens in a fraction of a second.
  • the glued fibers reach the fiber dryer at the end of the blow line. There they are dried to the desired moisture level and then pressed into sheet materials or molded parts.
  • the glue partially hardens during the drying process or diffuses into the fibers and is then no longer available for connecting fibers.
  • fiber moisture means water mass in relation to absolutely dry fiber mass
  • a fiber moisture is dried down by 10%.
  • the hardening glue no longer contributes to fiber binding. It is, so to speak, lost. It is assumed that about 20% of the glue used is no longer reactive after drying. Because glue is more expensive than fiber, this loss is a significant cost factor.
  • Chip mixers were used for the dry gluing of fibers, which are used for gluing wood chips in particle board production.
  • the construction of such mixers comprises a rotatable cylinder, which is usually arranged horizontally and is penetrated by a central shaft. The shaft is provided with outlet openings for the glue. If necessary, funds for the chips are attached in the cylinder or on the shaft. The energy consumption of chip mixers is considerable.
  • Dry gluing is particularly unsuccessful due to the poor glue distribution and the formation of fiber agglomerates. These cause a non-uniform surface of the fiberboard and a heterogeneous structure in the bulk density of the board. The raw density fluctuations caused by the fiber agglomerates can lead to damage to the press plates of modern continuous press systems.
  • the object described above is achieved in that the fiber agglomerates are swirled in a fiber / air stream, so that the fiber agglomerates are dissolved again by swirling. So far, all measures attempting to glue fibers with a fiber moisture content below 100% have been aimed at designing the gluing in such a way that no fiber agglomerates are formed. The method according to the invention also strives for this, but furthermore separates between the steps of gluing the fibers and dissolving fiber. ragglomerates.
  • the manner in which the fibers are fed to the gluing and subsequently to the dissolving of the fiber agglomerates can be designed as desired.
  • Mechanical transport of the fibers for example by screw conveyors, is conceivable.
  • fiber / air stream is particularly preferred.
  • This type of transport is particularly inexpensive and easy to implement.
  • Elaborate funding is not required and the fiber / air flow is easy to control.
  • air means above all ambient air, but this term also includes all other gases which can be used to transport the fibers and, if appropriate, also to treat the fibers.
  • a preferred embodiment of the method provides that the fibers are dried before gluing.
  • the moisture content of the fibers is preferably set to values below 20% or below 10%, depending on the production requirements subsequent to the gluing, also dried below 5% to below 1% moisture content. When drying, it is already taken into account, if necessary, that moisture is again applied to the fiber by applying glue.
  • the fiber agglomerates are preferably dissolved in that the fibers and the fiber agglomerates, which are conveyed in a fiber / air stream, are placed in a turbulent, detached, intensely vortex-laden flow.
  • the eddies created in turbulent flow exert shear forces on the fibers and fiber agglomerates, which are dimensioned such that the fiber agglomerates are broken down into individual fibers again, but the fiber itself remains undamaged. Since the glue adheres to the fiber surface more firmly than the fibers to one another, even the individual fibers still have a uniform glue.
  • a refiner runs, for example, with a plate spacing of more than 0.2 mm, preferably more than 1.0 mm. With this opening width, no grinding takes place, but the fiber / air flow is between the two the plates of the Refmers completely in turbulent, detached, eddy flow.
  • Refiners and mills are known as devices with extremely high energy consumption and therefore, for reasons of cost, there are concerns about the additional use of such plant parts, which are already used to manufacture the fibers themselves. However, these concerns can be refuted by the fact that the refiners or mills should not do any grinding work here. The devices are idle, so to speak. The energy consumption for dissolving the fiber agglomerates is therefore extremely low, so that hardly any additional costs arise from the use of these devices.
  • a rotor or propeller which is arranged at the outlet of the device for gluing fibers or in the subsequent line of the fiber / air flow, can accelerate and / or swirl the fiber / air flow sufficiently so that existing fiber agglomerates are dissolved again.
  • the fibers can be processed further immediately after gluing and dissolving the fiber agglomerates.
  • intermediate stores can also be arranged in order to collect the fibers before gluing or after the fiber agglomerates have dissolved. mine before they are fed to gluing or production.
  • fibers in the blow line are glued at speeds of over 200 m / s to over 450 m / s and then dried. It is obvious that both because of the imponderables of the drying process and because of the only approximately adjustable conditions of the gluing itself, an excess of glue must always be provided, which causes considerable costs. It is therefore regarded as a particular advantage of the method according to the invention that it is possible to glue fibers at low speeds because the glue additive can be metered precisely and economically.
  • the speed of the fibers during gluing is in any case below 150 m / s, preferably below 50 m / s. Falling speeds in the range between 0.1 and 10 m / s are particularly preferred. At such low falling speeds, which can be adjusted by appropriately controlling the fiber / air flow, there is sufficient time to optimally glue the fibers.
  • the fibers sink in a fiber / air stream at a natural falling speed following gravity.
  • Another advantageous embodiment of the method according to the invention is also related to the low speed of the fibers during gluing.
  • the climate, in particular temperature and air humidity, in the vicinity of the fibers can be set according to the invention in such a way as is most advantageous for applying the glue and, for example, for preventing the glue from hardening. This too Measure therefore contributes to the economic use of glue.
  • Temperature and air humidity as critical parameters for the ambient climate can easily be set, for example, by adding tempered air with a given air humidity.
  • the gluing can be carried out in the presence of inert or protective gases, for example when the presence of oxygen is not suitable for the glue.
  • the device for gluing fibers with a fiber moisture content of less than 100% comprises a tower which has a filling opening and a discharge as well as means for applying glue and a device for dissolving fiber aggregates which is arranged at the discharge of the tower.
  • the means for applying glue are arranged in the tower or in the wall of the tower.
  • the tower is of any cross-section, but preferably cylindrical.
  • the filling opening and the discharge are each attached to opposite ends of the tower, preferably in the area of the end faces.
  • the filling opening can be designed as a simple opening for introducing the fibers into the tower, but it can also be designed as a closable opening or as a lock, for example then if the fiber mass to be introduced into the tower is to be controlled by opening or closing the filling opening or if defined climatic conditions in the tower are to be observed.
  • the discharge can be designed in the same way as the filling opening as an opening to which, for example, a pipe is connected, as a closable opening or as a lock.
  • the device for dissolving fiber agglomerates either adjoins the discharge directly or is connected to the discharge by a connecting line, for example a pipe.
  • the fibers enter the tower through the filling opening.
  • the tower is preferably vertical with respect to the longitudinal axis of the tower, but it can also be arranged obliquely or even horizontally.
  • the fibers are mechanically or, which is preferred, introduced into the tower in a fiber / air stream and conveyed through the tower. With the tower standing vertically, it is particularly advantageous that the fibers, following gravity, can sink through the gluing zone in the tower without additional energy input, in which the gluing is carried out.
  • the tower has proven to be particularly suitable for carrying out the gluing because it has a sufficiently large volume to enable a throughput that can, for example, supply a fiberboard production.
  • a tower is easy to erect and can easily accommodate all the means for gluing, supplying air or swirling the fibers, which may be necessary to carry out the method.
  • the device for dissolving fiber agglomerates which has already been described in more detail above, is arranged on the discharge of the tower. After gluing, the fibers, in particular if a refiner or a mill is arranged at the discharge from the tower, are attracted by the suction generated by the rotor in the refiner or in the mill when the fiber / air flow is accelerating. Special subsidies between tower and refiner or mill are therefore usually not mandatory.
  • the means for gluing which are attached in or on the tower, are preferably designed as nozzles which are connected to a storage container via feed lines.
  • Nozzles are ideal for atomizing the glue and applying it to the surface of the numerous fibers that are conveyed through the tower.
  • the nozzles can be arranged in the wall of the tower.
  • the tower and the nozzles for the glue are to be coordinated so that the nozzles do not spray the glue onto the opposite wall of the tower, but on the other hand, the complete gluing of the fibers is guaranteed.
  • the arrangement of the nozzles can be chosen freely, it can be defined in a circular, spiral or other suitable manner.
  • the area of the tower in which the nozzles for gluing the fibers are attached is called the gluing zone.
  • the glue can be injected either pneumatically in the air flow or airlessly by spraying with static pressure.
  • means for introducing air or other gases are arranged in the tower or in the wall of the tower.
  • the means for introducing air or other gases are the mouths of corresponding supply lines.
  • these means for introducing air or other gases are preferably also designed as nozzles.
  • the nozzles are either distributed in the glue zone and / or outside the glue zone. They can be used for various purposes.
  • the air can be cooled, warmed, humidified or dried so that the climate in the tower, in particular in and after the glueing zone, can be adjusted via the means for introducing air.
  • air As already described above, mostly air be introduced into the tower. However, if an inert gas or protective gas atmosphere is required for special applications, this can be achieved at any time using the means for introducing gases. It is also possible in this way to introduce gaseous reaction components which are intended to interact with the glue into the tower. Additives that are important for the finished wood-based product, such as fungicides, can also be introduced here.
  • means for swirling and / or conveying fibers can be arranged in the tower or on the wall of the tower.
  • These means can be designed as baffles, rotors, baffles or the like. Since the conveying speed and the intermingling of the fibers are decisive for the quality and uniformity of the gluing, the arrangement of such means for intermingling is a measure which generally improves the result of the gluing significantly.
  • the means described above for gluing, for introducing air and for swirling and / or conveying fibers are preferably attached to or in the wall of the tower. This is structurally simpler and also less expensive from the point of view of maintenance than inserting such means into the interior of the tower. However, if there are reasons for arranging these means in the tower, for example space reasons, this is readily possible. It is particularly preferred that the means described above for gluing, for introducing air and for swirling and / or conveying fibers are designed to be adjustable. If nozzles are used, they should be adjustable so that the spray cones can still be optimally aligned even after installation, so that blind spots are avoided. It may also be necessary to make changes to the setting if the throughput of fibers in the tower changes or if other glues are processed. The spray cone of the nozzles and the flow rate should also be off be variable for the reasons mentioned.
  • the tower for carrying out the method according to the invention is preferably arranged vertically, with a filling opening at the top and a discharge at the lower end of the tower. With this arrangement, gravity is used to convey the fibers in the fiber / air flow and thus the energy expenditure is minimized.
  • the tower is cylindrical or approximately cylindrical.
  • the tower is conical at least in sections.
  • the tower should be conical in order to increase the speed of the fiber / air flow by reducing the cross-section, so that the formation of eddies and turbulence is supported.
  • the means for dissolving fiber agglomerates are preferably designed as refiners or mills. These known system parts have in common that they have at least one rotor, ie a fast rotating component.
  • the geometry of the refiner or the mill ensures that a fiber / air flow is carried out on a defined conveying path is moved from the filling opening through the gluing zone to the discharge and through the refiner or the mill, is set in a defined manner into a turbulent flow which is subject to eddies, without causing mechanical damage to the fibers.
  • the fiber agglomerates are also dissolved very gently because additional air is torn into the fiber / air flow when the vortices and turbulence are generated.
  • the fiber agglomerates are dissolved by swirling in the fiber / air flow.
  • the eddy, turbulent flow is preferably achieved by accelerating the fiber / air flow.
  • a comparatively small increase in the speed of the fiber / air flow by approximately 25% is sufficient, provided the fiber / air flow is swirled as much as possible when accelerating.
  • a greater increase in speed for example by approximately 50%, 100% or 200% or above, is equally suitable for eliminating fiber agglomerates by swirling in the fiber / air stream. It is advantageous that it is sufficient to briefly swirl the fiber / air flow. Seconds or fractions of a second of swirling are enough to break the fiber agglomerates back into glued single fibers.
  • Fiber agglomerates formed during gluing are both removed by swirling when the fiber / air flow is accelerated and swirled from a speed of approx. 10 m / s during gluing to approx. 25 m / s. The same effect is also achieved by accelerating the fiber / air flow to approx. 160 m / s without the fibers being damaged. Fiber agglomerates, which were created by gluing at a speed of approx. 150 m / s, are broken down again by accelerating the fiber / air flow to approx. 200 m / s without damaging the fibers.
  • the performance of the means for dissolving fiber agglomerates is adjustable. As already described above, only a low drive power is required in order to set the fiber / air flow as completely as possible in turbulence, but it may be necessary to adapt the performance of the refiners, mills or propellers or rotors in the event of fluctuations in throughput is.
  • a particularly preferred development of the invention provides that the fiber / air stream is passed into or through a classifier after the fiber agglomerates have dissolved, in which excess air is separated from the fiber / air stream, which was absorbed when the turbulence was generated.
  • the excess air is preferably circulated through lines which are arranged between the classifier and the means for introducing air and other gases. It is obvious that it is possible to simply discharge excess air into the environment, but it is advantageous, partly because of the more favorable energy balance, to at least partially close the circuit. In particular, if not air but other gases are added to the tower, the closed circuit is recommended to save cleaning systems that would otherwise have to be installed when excess air is discharged into the environment.
  • the device for gluing fibers are in or on the lines that between the classifier and the means for introducing Air is arranged in the tower, means are attached with which the temperature and / or humidity of the excess air can be adjusted before it is fed back to the tower. If necessary, cleaning devices can also be used which remove undesirable substances from the air flow to be circulated.
  • the aforementioned means for setting temperature and / or humidity, that is cooling or. Heating devices or air humidifiers or dehumidifiers are particularly advantageous if the climate in the gluing zone or in the tower as a whole is controlled according to certain specifications.
  • a method for controlling the application of glue to the fibers in which, depending on the fiber mass to be glued and / or of the proportion of glue to be applied per fiber mass, the means for applying glue are adjusted individually, in groups or overall so that they introduce a predetermined proportion of glue per unit of time or per unit of weight based on the fiber mass to be glued into the tower.
  • the method proposed here it is possible to influence the application of glue to the fibers and to control the reaction conditions accordingly in detail. As a result, the use of glue and energy can be optimized and the uniformity of the glue application to the fibers can be specifically improved.
  • An improved glue application is also achieved in that the means for introducing air or other gases into the tower are adjusted so that a given swirling and / or a given path or a given speed of the fiber / air flow is maintained.
  • the consistency of the glue to be applied to the fibers as a function of the air humidity in the tower. Since the moisture content of the fibers is a critical parameter with regard to pressing, and since additional moisture is applied to the fibers by applying the glue, a precise adjustment of the consistency of the glue means an improved adjustment of the glued fibers to the pressing.
  • Figure 1 is a schematic representation of a device for gluing fibers in longitudinal section.
  • FIG. 2 a-d a cross section through the gluing zone of a device according to FIG. 1;
  • FIG. 2e shows a longitudinal section through the gluing zone of a device according to FIG. 1;
  • Fig. 4 is a schematic representation of a fiber entry into a device for gluing fibers.
  • a tower 4 is the core of the device 2.
  • the tower 4 is made of stainless steel and, if necessary, coated on the inside with Teflon or a comparable material with an anti-adhesive effect. The coating prevents the glued fibers from adhering to the wall 6 of the tower.
  • the tower 4 is about 10 m high and has a diameter of about 1.5; it is essentially cylindrical.
  • Glue application nozzles 8, the spray cones of which are adjustable, are let into the wall 6 of the tower 4.
  • the glue application nozzles 8 are connected to a glue reservoir 12 via a feed line 10.
  • 4 air nozzles 14 are let into the wall 6 of the tower.
  • the air nozzles 14 also have adjustable spray cones. The air sprayed in through the air nozzles 14 is supplied via feed lines 16.
  • a simple fill opening 18 is attached, which is neither closable nor changeable in its passage.
  • Other embodiments of the filling opening for example openings with an adjustable diameter or locks or the like can be used if required.
  • Fibers with a fiber moisture content below 100% are introduced into the tower 4 through the filling opening 18. The fibers are preferably fed either from a storage container or from a dryer.
  • a discharge 20 is arranged on the opposite end face of the tower 4.
  • the discharge 20 connects the tower 4 to a refiner 22.
  • the walls 24 of the discharge 22 are conical towards the refiner 20.
  • the discharge 20 opens approximately in the center of the refiner disks 26.
  • the conical discharge 20 brings about a significant increase in the flow velocity due to the narrowing of the cross-section and thereby promotes the formation of turbulence and produces an intensive swirling of the fiber / air flow due to the acceleration.
  • the refiner 22 has two profiled disks 26, one of which is stationary (stator) and one disk is rotating at approximately 4,000 revolutions per minute (rotor).
  • the disks are spaced approximately 1.5 mm apart. At this disc distance, the rotor runs roughly at idle; it does not do any grinding work because the passage between the stator and rotor is too large.
  • the refiner 22 creates turbulence that leads to the dissolution of fiber agglomerates.
  • the refiner 22 is also made of stainless steel and optionally coated, for example with Teflon, so that the glued fibers do not adhere to the disks 26 or other parts of the refiner 22
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  • the glue zone "B" is the area of the tower 4 in which glue application nozzles 8 are embedded in the wall 6 of the tower.
  • the fibers are sprayed in the glue zone "B” with approx. 10 to 20% glue based on the absolutely dry fiber mass.
  • the glue is sprayed in finely divided and is almost completely deposited on the surface of the fibers.
  • the air nozzles 14, which are arranged between the glue application nozzles 8 in the glueing zone "B", are oriented such that they align the fiber / air flow so that the fibers are exposed to the spray cone of the glue application nozzles 8 as evenly as possible.
  • the spray cone of the air nozzles 14 can also be oriented counter to the main direction of movement of the fiber / air flow.
  • Gluing the fibers with the device described here already minimizes the formation of unwanted fiber agglomerates.
  • Previously known methods for dry gluing of fibers use chip mixers with a relatively small volume and mechanical conveying devices which are well suited for gluing chips, but which cannot be used at all for gluing fibers. Fibers have completely different dimensions, a much higher surface area per unit of weight and accordingly a lower bulk density, but no significant stiffness.
  • the fiber agglomerates which still form despite the improved glue application, are dissolved again in a subsequent process step.
  • the fiber / air stream with the fiber agglomerates contained therein is fed to the discharge 20 and from there to the refiner 22.
  • the discharge 20 is conical and the cross section tapering towards the refiner 22 causes a steady increase in the speed of the fiber / air flow and thus an increase in turbulence and turbulence in the fiber / air flow.
  • the speed of the fiber / air flow is increased to approx. 50 m / s and the fiber / air flow is completely set in turbulence.
  • the fiber agglomerates dissolve in the turbulence of the detached, eddy flow without the fibers being damaged.
  • the disc spacing of the discs 26 of the refiner 22 is dimensioned at approximately 1.5 mm so that the glued fibers are not ground.
  • the speed of the rotor and the distance between the disks are approximate. The particular settings are chosen by the person skilled in the art so that the desired success, the dissolution of the fiber agglomerates, is achieved with the least possible use of energy.
  • the glued, now isolated fibers are fed in the fiber / air stream from the refiner 22 to the sifter 28. Excess air that was sucked in when the turbulence was generated is separated again.
  • the classifier like the system parts already described (tower 4, refiner 22), is made of stainless steel and optionally coated. The same applies to the lines through which the fiber / air flow is led.
  • the classifier 28 is a component known per se for separating excess gas or air quantities.
  • the excess air is at least partially returned to the tower 4 through lines 16.
  • the fibers are either conveyed by the sifter 28 into a storage container or transported to a forming station, which forms, for example, plate blanks, which are pressed into fiber plates or molded parts in a subsequent press.
  • the air nozzles 18 can not only be used, for example, to control the fiber / air flow or to swirl the fibers, they can also be used — all in groups or individually — for spraying in gases, which affect the reactivity of fibers or glue, optionally the sprayed-in gas can also be a component of the glue.
  • Means for swirling the fibers are not shown in the tower 4 in FIG. 1. However, it should be pointed out that such means, for example baffles, baffles or the like, can be fitted in the tower 4 or on the walls 6 of the tower 4 in order to ensure optimal guidance of the fiber / air flow.
  • the glue application is advantageously controlled in such a way that the sprayed-in amount of glue is dosed in each case depending on the fiber mass entered in the tower 4.
  • the throughput of the glue application nozzles 8 is increased or decreased, depending on the mass of the fibers to be glued per unit of time.
  • the method according to the invention offers the possibility of specifying the climate in the tower 4, in particular temperature and / or air humidity, so as to specifically influence the fiber moisture.
  • over-dried fibers can be re-moistened from the filling opening 18 up to the entry into the glue zone "B" by spraying in moist air, or insufficiently dried fibers can be further dried by spraying in dry air.
  • the premature curing of glue or the penetration of glue into the fibers can be prevented by setting a defined temperature and air humidity in the glue zone. Temperatures of approx. 20 to 80 C, but usually approx.
  • the excess liquid taken up during the glue application can be at least partially removed again by drying by spraying dry air through the air nozzles 14 which are arranged between the gluing zone "B" and the discharge 20.
  • Such a climate profile is easily set according to the invention by arranging air nozzles 14 and glue application nozzles 8, by detecting fiber mass entered in the tower 4 and possibly the fiber moisture, and by controlling the nozzles 8 and 14 depending on the fiber mass and moisture. It is also advantageous to additionally record the temperature of the fibers when entering them in the tower 4 and to set the temperature and, if appropriate, the air humidity in the tower 4 as a function of the temperature of the fibers and the fiber moisture. It is particularly preferred if the climate in the tower 4 is set before, in and after the gluing zone "B" in each case depending on the state of the unglued or glued fibers.
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  • the glue zone “B” is flared and tapers from the end of the glue zone “B” to the discharge 20.
  • Such a construction is expensive, but combines the advantages of the tower shapes described in FIGS. 3a and 3b.
  • the dimensions of the tower 4 can vary widely, in each case depending on the shape of the tower, on the fiber throughput per unit of time and on the requirements with regard to the climate profile to be set. Construction heights of approx. 5 to 25 m and diameters of 0.75, preferably approx. 3.5 m to 6 m, can easily prove to be expedient.
  • FIG. 4 shows the upper section 32 of a tower 4 with an alternative embodiment of a filling opening 19.
  • the cross section of the upper section 32 widens from the filling opening 19 to the tower 4 in the shape of a truncated cone.
  • a distribution cone 34 is arranged in this upper section 32, so that the fiber / air flow introduced through the filling opening 19 is distributed in a circular manner and entered into the tower 4.
  • a perforated screen 36 is attached in the tower 4. It covers the cross section of the tower 4.
  • the hole width is between approximately 0.5 and 5 cm, preferably between approximately 0.8 and 3 cm.
  • a drive 38 for a distribution device 40 is fastened in or under the distribution cone 34.
  • the rotating distribution device 40 here designed as a doctor blade 42 with a plurality of arms, distributes the fiber / air flow introduced via the filling opening 19 and the upper section 32 of the tower 4 over the entire cross section of the tower. The fibers thus fall evenly distributed over a large cross section in the tower 4 in the gluing zone.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Paper (AREA)
  • Peptides Or Proteins (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

La présente invention porte sur un procédé d'enduction de fibres à la colle, consistant à appliquer de la colle sur des fibres ayant un indice d'humidité inférieur à 100 % et à faire se dissoudre les agglomérats fibreux subsistant après l'enduction à la colle en les faisant tourbillonner dans un courant air/fibres. Les fibres enduites de colle se prêtent à la fabrication de matériaux dérivés du bois, notamment de panneaux de fibres et de préformés. L'invention porte également sur un dispositif de mise en oeuvre du procédé et sur un procédé d'application contrôlée de la colle.
PCT/DE1998/002736 1997-09-16 1998-09-15 Procede d'enduction de fibres a la colle WO1999014023A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AT98954176T ATE211960T1 (de) 1997-09-16 1998-09-15 Verfahren zum beleimen von fasern
AU11423/99A AU732714B2 (en) 1997-09-16 1998-09-15 Method for coating fibers with glue
EP98954176A EP1017550B1 (fr) 1997-09-16 1998-09-15 Procede d'enduction de fibres a la colle
BR9812455-2A BR9812455A (pt) 1997-09-16 1998-09-15 Processo para colagem de fibras
JP2000511619A JP2001516657A (ja) 1997-09-16 1998-09-15 繊維に接着剤を塗布する方法及び装置
DE29880083U DE29880083U1 (de) 1997-09-16 1998-09-15 Vorrichtung zum Beleimen von Fasern
CA002304232A CA2304232A1 (fr) 1997-09-16 1998-09-15 Procede d'enduction de fibres a la colle
DE59802663T DE59802663D1 (de) 1997-09-16 1998-09-15 Verfahren zum beleimen von fasern
NZ502760A NZ502760A (en) 1997-09-16 1998-09-15 Method and apparatus for coating lignocellulose fibers with glue

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19740676A DE19740676C2 (de) 1997-09-16 1997-09-16 Verfahren zum Beleimen von Fasern
DE19740676.9 1997-09-16

Publications (1)

Publication Number Publication Date
WO1999014023A1 true WO1999014023A1 (fr) 1999-03-25

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PCT/DE1998/002736 WO1999014023A1 (fr) 1997-09-16 1998-09-15 Procede d'enduction de fibres a la colle

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EP (1) EP1017550B1 (fr)
JP (1) JP2001516657A (fr)
CN (1) CN1270549A (fr)
AT (1) ATE211960T1 (fr)
AU (1) AU732714B2 (fr)
BR (1) BR9812455A (fr)
CA (1) CA2304232A1 (fr)
DE (3) DE19740676C2 (fr)
NZ (1) NZ502760A (fr)
WO (1) WO1999014023A1 (fr)

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NL1013941C2 (nl) * 1999-12-23 2001-06-26 Dirk Cornelis Van Der Woude Werkwijze voor het vervaardigen van een vezelplaat en volgens deze werkwijze vervaardigde plaat.
DE10025177B4 (de) * 2000-05-24 2004-04-15 Flakeboard Company Limited, St.Stephen Verfahren und Vorrichtung zur Auflösung von Ungleichmäßigkeiten in Holzfaserströmen
US6902125B2 (en) 2000-05-24 2005-06-07 Fritz Schneider Process and device for disintegrating irregularities in flows of wood fibres
DE10059881B4 (de) * 2000-12-01 2005-06-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Anlage zur Faseraufbereitung
ITMO20010033A1 (it) * 2001-02-23 2002-08-23 Imal Srl Metodo ed apparecchiatura per aggiungere collante ad un flusso di materiale legnoso incoerente
DE10153593B4 (de) * 2001-11-02 2005-11-17 Fritz Egger Gmbh & Co Vorrichtung und Verfahren zum Benetzen von Holzfasern mit einem Bindemittelfluid
DE10247414B4 (de) * 2002-10-11 2009-04-02 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Anlage zum Beleimen von Fasern für die Herstellung von Faserplatten, insbesondere MDF-Platten o. dgl. Holzwerkstoffplatten
DE10247412C5 (de) * 2002-10-11 2010-07-01 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Anlage zum Beleimen von Fasern für die Herstellung von Faserplatten, insbesondere MDF-Platten und dergleichen Holzwerkstoffplatten
DE10247413B4 (de) * 2002-10-11 2009-05-07 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Anlage zum Beleimen von Fasern für die Herstellung von Faserplatten, insbesondere MDF-Platten oder dergleichen Holzwerkstoffplatten
DE10336533A1 (de) * 2003-08-05 2005-02-24 Dieffenbacher Gmbh + Co. Kg Verfahren und Vorrichtung zum Benetzen von rieselförmigen Gütern mit einem Bindemittel
DE10341960B4 (de) * 2003-09-11 2008-02-07 Glunz Ag Mischverfahren und statischer Mischer, insbesondere zur Beleimung von lignocellulosehaltigen Fasern mit einem Bindemittel
DE10356775A1 (de) 2003-12-02 2005-07-07 Dieffenbacher Gmbh + Co. Kg Verfahren und Anlage zur Beleimung von Fasern und eine Faserbeleimungsvorrichtung
DE102004001527B4 (de) * 2004-01-10 2006-02-16 Büttner Gesellschaft für Trocknungs- und Umwelttechnik mbH Anlage und Verfahren zum Beleimen von Fasern für die Herstellung von Faserplatten, insbesondere MDF-Platten u. dgl. Holzwerkstoffplatten
WO2006021212A1 (fr) * 2004-08-27 2006-03-02 Force Technology Procede et dispositif pour l'application d'un liant synthetique sur un flux de fibres aerien
DE102004054162B3 (de) * 2004-11-10 2006-05-04 Flakeboard Company Limited, St.Stephen Verfahren und Vorrichtung zur Verhinderung von Verunreinigungen einer Transporteinrichtung aufgrund frischbeleimter Fasern
DE102007011497B4 (de) * 2007-03-07 2015-07-30 Fritz Egger Gmbh & Co. Holzwerkstoff und Verfahren zu dessen Herstellung
EP2431144B1 (fr) 2010-09-15 2012-10-31 Kronotec AG Procédé et dispositif destinés au collage humide de fibres en bois
ITMO20120248A1 (it) * 2012-10-16 2014-04-17 Imal Srl Dispositivo e metodo per l'iniezione di fluidi all'interno di un flusso di materiale incoerente.
CN104162921A (zh) * 2013-05-17 2014-11-26 北京泛欧瑞得科技有限公司 一种用于纤维板的喷浆管高压定量节胶工艺
US20150107749A1 (en) * 2013-10-18 2015-04-23 Unilin, Bvba Process and Device for Gluing Dried Fibers Designated for the Production of Fiberboards
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
DE102019114039A1 (de) * 2019-05-26 2020-11-26 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung zur Beleimung von Partikeln im Zuge der Herstellung von Werkstoffplatten und ein Verfahren zum Betreiben der Vorrichtung
CN111015880A (zh) * 2019-12-24 2020-04-17 山东省林业科学研究院 一种大片刨花施胶阻燃装置

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Also Published As

Publication number Publication date
BR9812455A (pt) 2000-10-03
DE59802663D1 (de) 2002-02-21
DE19740676A1 (de) 1999-03-18
CN1270549A (zh) 2000-10-18
ATE211960T1 (de) 2002-02-15
DE19740676C2 (de) 2003-07-17
AU732714B2 (en) 2001-04-26
EP1017550B1 (fr) 2002-01-16
DE29880083U1 (de) 2000-12-28
EP1017550A1 (fr) 2000-07-12
AU1142399A (en) 1999-04-05
NZ502760A (en) 2001-11-30
JP2001516657A (ja) 2001-10-02
CA2304232A1 (fr) 1999-03-25

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