EP1414629B8 - Panneau realise dans un materiau derive du bois et de production ecologique - Google Patents

Panneau realise dans un materiau derive du bois et de production ecologique

Info

Publication number
EP1414629B8
EP1414629B8 EP02794508A EP02794508A EP1414629B8 EP 1414629 B8 EP1414629 B8 EP 1414629B8 EP 02794508 A EP02794508 A EP 02794508A EP 02794508 A EP02794508 A EP 02794508A EP 1414629 B8 EP1414629 B8 EP 1414629B8
Authority
EP
European Patent Office
Prior art keywords
glue
fibers
wood
sawdust
wood chips
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02794508A
Other languages
German (de)
English (en)
Other versions
EP1414629A1 (fr
EP1414629B1 (fr
Inventor
Josef KRONOSPAN TECHNICAL COMPANY LTD. STUTZ
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.)
Lignum Technologies AG
Original Assignee
Kronoplus Technical AG
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
Priority claimed from DE20112599U external-priority patent/DE20112599U1/de
Priority claimed from DE20210718U external-priority patent/DE20210718U1/de
Application filed by Kronoplus Technical AG filed Critical Kronoplus Technical AG
Priority to EP02794508A priority Critical patent/EP1414629B8/fr
Priority claimed from PCT/EP2002/008003 external-priority patent/WO2003013809A1/fr
Publication of EP1414629A1 publication Critical patent/EP1414629A1/fr
Publication of EP1414629B1 publication Critical patent/EP1414629B1/fr
Application granted granted Critical
Publication of EP1414629B8 publication Critical patent/EP1414629B8/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 manufacturing method and an associated one
  • the invention relates in particular to panels made from wood fibers.
  • the "Blue Line” expands. A swirling is caused by the expansion.
  • the glue mixes with the fibers. The proportion of glue in relation to the fibers is approximately 22% by weight.
  • the "Blue Line" opens into the middle of a drying tube.
  • the drying tube has a diameter of, for example, 2.60 m. Air is blown through the drying tube at a temperature of 160 ° C, maximum of 220 to 240 ° C
  • the drying tube reduces the moisture from 100% to 8 to 11%, and the steam generated is separated from the fibers in subsequent cyclones and fed to the environment via chimneys.
  • the steam is disadvantageously contaminated with water-foreign substances. In this way, odorous substances are released into the atmosphere. The environment is polluted accordingly.
  • the fibers provided with glue become one in layers
  • the fibers are pressed here in two phases. First, a pre-pressing takes place. The pre-pressed fibers are then pressed using high pressure and the application of heat to the board. Experts have found that the plates split if the temperature falls below 150 ° C during the pressing to the plate and is, for example, 140 ° C. The temperatures during the pressing are therefore typically around 180 ° C.
  • a gluing device for the production of fiberboard is known from the document EP 0 744 259 A2.
  • a process for the production of boards from a wood-based material can be found in US Pat. No. 5,554,330.
  • GB 791, 554 discloses a method for
  • the object of the invention is to create a more environmentally friendly method for producing a plate of the type mentioned at the outset and to provide an associated device together with a component manufactured in accordance with the method.
  • the object of the invention is achieved by one of the claimed methods.
  • a device for carrying out the method has the features of a first subsidiary claim. The result is a component with the features of the additional subclaim.
  • the object is achieved in accordance with one of the claimed processes by first separating wood chips consisting of wood into solid and liquid components.
  • the solid components are dried and provided with glue.
  • the solid components provided with glue are pressed into a plate or another shaped body.
  • the liquid components include in particular lignin and hemicellulose. At the temperatures prevailing during drying, these substances cause emissions, which also lead to odor and thus environmental pollution. By separating these liquid components before drying, emissions during and / or after drying are reduced accordingly. The environment is correspondingly less polluted during production.
  • the liquid constituents are preferably disposed of and / or further processed at temperatures at which only low emissions occur. If the temperatures of the liquid constituents are high and in particular are above 90 ° C., the liquid constituents are kept in a gas-tight system with respect to the environment until the temperatures have dropped sufficiently.
  • liquid constituents in particular lignin and hemicellulose, are used as glue, that is to say according to the invention with the dried solid
  • the solid components are preferably added Fibers or chips processed further.
  • the liquid constituents can be separated from the solid constituents in a so-called agitator.
  • the abovementioned constituents which are obtained are typically 20 to 35% by weight of hemicellulose, 45 to 50% by weight of cellulose and 20 to 35% by weight of lignin.
  • Cellulose is an integral part of the wood.
  • wood chips are first introduced into a stuffing screw. From the stuffing screw, the wood chips come into a cooking container in the compressed state and are cooked here under high pressure.
  • the cooking container is designed for high pressures.
  • the pressure in the cooking container is in particular at least 1.2 to 2.2 MPa (12 to 22 bar).
  • wood chips are usually cooked at pressures of only 0.8 to 0.9 MPa.
  • the thermal steam treatment separates the solid wood components (cellulose) from the lignin and hemicellulose, which are liquid components.
  • the cellulose is in solid form.
  • the other two components, lignin and hemicellulose are liquid and can basically be used as glue.
  • the adhesive force is mainly caused by the hemicellulose.
  • liquid constituents After the liquid constituents have been separated off, they cool down significantly and are only led out of the gas-tight system at relatively low temperatures and, for example, further processed, that is to say in particular sprayed onto the fibers via nozzles.
  • the liquid constituents have therefore cooled significantly, in particular by at least 30 ° C., preferably by at least 50 ° C., before they leave the system which is encapsulated in a gas-tight and thus odor-tight manner. In this relatively cool state, the development of smells is significantly lower. It is then not critical to remove the liquid components from the gas-tight system.
  • the liquid components can be used as glue. This is made possible in an environmentally friendly way that the liquid components of a wood only at low temperatures, especially at
  • the gas-tight system consists, for example, of the container and connected lines.
  • Another container, which is used for cooling, for example, can be part of the gas-tight system.
  • the glue is undesirably subjected to a temperature treatment when applied in accordance with the prior art. From approx. 80 °, glue is adversely loaded or activated. Activated glue can no longer be used in the subsequent processing step, in which the glued solid wood components are pressed into the board. The active part of the glue is reduced by the aforementioned prior art. Of the 22% by weight originally usually used, only 1 to 8% by weight are still ready for use when the fiber / glue mixture leaves the drying tube. According to the invention, glue is applied to solid wood components in a relatively cool state. This prevents premature, unnecessarily extensive activation of glue.
  • hemicellulose and lignin are mixed with another glue in the cooled or cool state.
  • the other glue was therefore not obtained from liquid components of the wood.
  • the proportion of hemicellulose and lignin in the glue mixture thus provided is preferably not more than 20% by weight.
  • the mixture also contains, in particular, reactive resins as glue, preferably based on formaldehyde-urea. Furthermore, the glues or resins used in the prior art are used.
  • the solid constituents are first dried and then glue is mixed with the dried constituents at temperatures which are substantially below that
  • Drying temperatures are below 100 ° C in particular. This prevents the glue from being undesirably exposed to the relatively hot temperatures that occur during drying.
  • the glue also contributes to emissions in the prior art. Since it is no longer exposed to the hot drying temperatures, but instead is applied to the solid components at relatively cool temperatures, emissions from the glue are also avoided. So only water but no chemicals are dried in the dryer or drying tube. This results in corresponding environmental advantages, since the dry air is not disadvantageously contaminated with vapors that come from the glue according to the prior art becomes. The manufacture of the components is correspondingly more environmentally friendly. In addition, this embodiment has the advantage that portions of the glue are not disadvantageously activated during the drying process and are therefore no longer available for the actual gluing of the wooden components to the board.
  • the solid constituents which are present in particular in the form of fibers or chips and which are dried, are advantageously not liquid constituents of the wood-based material or in the aforementioned
  • the solid components are fed to a belt scale before gluing.
  • the solid components On the belt scale, the solid components are transported on one side by means of a circulating conveyor belt, on the other side they are weighed. This provides information about the amount of glue to be added to the solid components of the wood in the subsequent step.
  • the solid components are transferred to the subsequent facility using the belt scale. Possible fluctuations in the weight of the supplied solid components are recorded, registered and stored in one embodiment during transport. This data is processed and can serve as a control variable for the amount of glue that is subsequently applied to the solid components.
  • the transport speed in the belt weigher is controlled so that a uniform amount of solid components is fed to the subsequent gluing device (device in which the solid wooden components are provided with glue).
  • the subsequent gluing device device in which the solid wooden components are provided with glue.
  • the weight of the solid components which can be in the form of fibers or chips, can be measured in the smallest steps and enables the solid components to be fed in evenly
  • Components with an accuracy of, for example, ⁇ 1% Components with an accuracy of, for example, ⁇ 1%.
  • the gluing is therefore carried out in a mixer in which glue and solid components are mixed with one another.
  • the mixer has means for cooling its housing.
  • an at least partially double-walled housing for example a double-walled tube, is provided for this purpose, which is part of the housing of the mixer.
  • a chilled liquid such as chilled water, is passed through the double-walled housing to cool the mixer or its walls.
  • the cooling must be designed accordingly.
  • the layer of condensed water ensures that solid components with glue do not stick to the walls and clog the mixer.
  • the solid constituents After the solid constituents have been dried, in one embodiment of the invention they are distributed over a large area and a kind of curtain or mat is formed. This is particularly the case when the solid constituents are in the form of fibers, since one easily results from this
  • Mat or a curtain can be formed. Glue is then added, especially sprayed into the curtain. An air-glue mixture is preferably sprayed in, in order to ensure that the glue is distributed as evenly as possible.
  • the formation of a curtain ensures that the glue is distributed evenly over the solid components. This is particularly the case when the solid components are in the form of fibers.
  • a curtain or mat formed from solid components is introduced into the mixer.
  • the curtain or mat is then blown through nozzles with an air-glue mixture.
  • the glue is fed to the curtain or mat via the nozzles.
  • the curtain or mat is then preferably passed through the mixer without contact.
  • the contactless implementation advantageously prevents the solid components from sticking to walls. This reduces pollution problems and the associated costs.
  • the glue is blown into the dried solid components of the wood together with air, in particular at a temperature of 40 to 70 ° C., preferably at a temperature of 55 to 60 ° C. This ensures that the glue reaches a dry outer skin. He will minimally activated. This ensures that the subsequent mixture of solid wood components and glue does not stick to transport equipment and devices, for example inside the mixer.
  • the glue is prepared in such a way that it hardens after a predetermined time.
  • the glue can be suitably adjusted by heat treatment.
  • a hardener can be entered or added, which can e.g. Hardens for 60 seconds.
  • the glue is prepared in particular in the mixer or a hardener is added to the dried solid components together with the glue immediately before the mixer.
  • Chemicals such as Reduce formaldehyde. This results in further environmental benefits.
  • the glue is swirled with heated air and this air-glue mixture the dried solid
  • the free surface of the glue is further activated in an embodiment of the invention by a device suitable for this purpose, in order to facilitate subsequent processing steps.
  • the solid components contaminated with glue are therefore preferably in a riser pipe, which is in particular 10 to 30 m, preferably about 20 m long.
  • the diameter of the riser pipe is in particular 1 to 4 meters.
  • the riser pipe is preferably also cooled and in turn is then, for example, double-walled in order to pass a cooling liquid between the two walls of a double wall.
  • the goal is again the formation of a condensation layer on the inner walls of the
  • riser pipe so that the glued solid components do not stick to the walls.
  • the glued solid components can be passed through an air or gas stream in a particularly simple, contactless manner.
  • the solid components especially if they are in the form of fibers, should be passed through the riser pipe at a speed of at least 25 meters per second, preferably at least 35 meters per second. If the speed is lower, fibers or chips remain stuck to the riser pipe despite the aforementioned measures. This would cause the riser pipe to become dirty unnecessarily quickly. When lower speeds were intended, the riser had to be cleaned after only 8 hours. By setting a suitable speed, the cycles could be extended to 7 to 8 days.
  • the maximum speed at which the solid components containing glue are blown through the riser pipe depends on the performance of the following components or devices. It must be taken into account here that the following components or devices must be able to process the incoming quantity of solid components. In practice, an upper limit of 40 meters per second could currently be easily achieved. From 50 meters per second, the following ones were used up to now
  • the solid constituents which contain glue, enter a cyclone.
  • the glue has now been sufficiently activated on the surface due to the aforementioned measures, so that it no longer adheres to the cyclone.
  • the solid constituents are separated off in the cyclone and transported to the next processing step by means of transport such as a belt.
  • the solid components are separated from the air in cyclones.
  • the transport means guides the fixed components into a viewing device.
  • the solid components are examined for coarse components in the display unit.
  • the coarse components are sorted out automatically.
  • Coarse constituents are, for example, lumps of glue.
  • the solid components are transported from the viewing device to the press by means of a belt and pressed here to the plate.
  • the press preferably consists of rotating press belts pressed against each other, which are suitably tempered. This means that pressing can be carried out continuously.
  • the temperature must be adjusted by the person skilled in the art to the glue used in each case. The amount of energy and the resulting temperatures for the two press belts are therefore selected differently in one embodiment in order to avoid warping in the plate produced. The temperature difference is easily 20 ° at press temperatures that are around 200 ° C.
  • the nozzles through which the glue is added to the solid components in one embodiment of the invention are preferably conical. The glue then emerges in droplets through the cone tip, so that this advantageously promotes a uniform distribution of the glue, that is to say it improves it.
  • the glue emerging from the nozzles does not contact subsequent tools, for example the tools in the mixer.
  • the glue is therefore preferably directed directly in the direction of the solid constituents, in particular sprayed, in order to achieve the most uniform possible distribution.
  • Tools in the mixer and the nozzles should be at least 1 meter, preferably at least 2 meters, if the glue is injected horizontally.
  • the solid components are then introduced vertically at the beginning of the mixer and transported horizontally in this.
  • the specified distance values refer, of course, only to a specific individual case. They are not generally applicable, since ultimately the speed at which the glue emerges from the nozzles is also important.
  • a glue-air mixture is sprayed in the direction of the solid constituents, an air stream is advantageously available at the same time, with which the solid constituents are blown and subsequently transported through contactless devices such as a mixer or a riser pipe.
  • another gas can be used instead of air.
  • mixing tools are used as tools in a mixer, which cause the solid components to mix with the glue.
  • the solid components come in front of the nozzles in the form of a curtain. In addition to the advantages already mentioned, this prevents glue from spraying into the mixer and contaminating tools here. Otherwise, the solid components would adhere to the tools and the mixer would clog in a very short time and would have to be cleaned at short intervals.
  • the tools in the mixer are attached to a centrally installed axis and consist of rods which protrude in a star shape and which, like a rudder blade, merge into a flat area.
  • a star is formed from, for example, four tools.
  • Two tools form an angle of 90 °.
  • the rudder blades are tilted compared to the air flow that flows through the mixer. This results in a swirling of the air and thus a thorough mixing of the solid components with the glue.
  • Several "stars" formed by tools are attached to the axis at regular intervals. The solid components are then transported through the mixer parallel to the axis.
  • the tools are designed in such a way that air is swirled in addition to the solid components or propeller-like tools are therefore preferable.
  • a curtain is preferably produced from the solid components as follows.
  • a means of transport ends up with at least one, preferably with several Rollers provided.
  • the solid components are passed through the roller (s).
  • the rollers are pressed against each other in particular. If there is a gap between two rollers or a roller and an adjacent surface, this is basically harmless. This ensures that a kind of curtain or mat is formed from the solid components by the rollers. So the curtain shape is created by the rollers.
  • a conveyor belt is preferably used, since this ensures a uniform feed of fibers to the rollers. If a belt scale is used, the
  • a uniformly thick and wide curtain is advantageous to achieve an even glue distribution. It also ensures that the curtain is injected
  • Form of fibers are present, are passed on like cotton or lumps. This would hinder the desired uniform gluing.
  • rollers used by the solid components to produce a Curtain passed through The rollers are preferably arranged offset one above the other in such a way that an acute angle of the rollers is enclosed with a means of transport, for example a conveyor belt or the belt scale. As a result, sufficient material can be added to the means of transport, for example placed on the belt scale, in order to be able to process a sufficiently large amount of solid components evenly.
  • the opening through which the curtain consisting of the solid components in one embodiment is introduced into or in front of the mixer preferably corresponds to the maximum width of the mixer housing, that is to say, for example, the diameter of the tube mentioned, which at the same time forms the walls of the mixer. This ensures that the entire width in the mixer is covered by the curtain. Otherwise glue could splash into the interior of the mixer past the remaining openings on the side of the curtain, and the aforementioned contamination problems would occur.
  • the side walls of the mixer are preferably opened in practice
  • the temperatures mentioned are also suitable for the formation of a condensation layer on the inner walls within the riser pipe.
  • the nozzles for feeding glue in one embodiment of the invention are at a distance from the housing of the mixer.
  • the nozzles are then in front of an opening of the mixer housing.
  • a gap or annular gap thus remains between the nozzles and the opening, through which air is entrained and can thus be suitably supplied.
  • the air which is introduced via the gap or annular gap can be preheated in order to provide a desired temperature in the mixer, in particular in order to promote a desired activation of the glue on the surface.
  • tools inside the mixer are mounted on an axis.
  • the nozzles for feeding in glue are then arranged in a ring around the axis in order to provide glue evenly to fibers.
  • the fibers or the curtain consisting of fibers are then preferably fed perpendicular to the axis between nozzles and tools.
  • nozzles are arranged in a ring in one or more rows. With a correspondingly large diameter, the entire opening of the mixer is sprayed with glue by arranging a second row of nozzles in a ring around the axis.
  • the fibers made of solid wood are combined in one
  • Embodiment of the invention additionally added glass fibers or plastic fibers.
  • the addition takes place especially in or immediately before the mixer.
  • plate-like molded parts can be produced particularly well, which are provided, for example, as interior trim in a car.
  • Such shaped panels can be used in the automotive industry, for example, as a rear shelf. It is then sufficient to simply pre-press the layer system.
  • MDF panels intended for the production of panels
  • the MDF panels intended for the production of panels have an upper side and a lower side, which run parallel to one another and which are flat. These plates are a few millimeters thick. As a rule, they have no plastic or glass fibers, since no special shapes have to be realized that deviate from a flat surface.
  • Molded parts of the aforementioned type are also used in the furniture industry. Such moldings are z. B. needed for doors that are specially shaped for design reasons.
  • Prepressing takes place at much lower pressures than that actual pressing step.
  • the prepress pressure can only be 1/3 of the pressure that is used for the actual pressing step.
  • the actual pressing step can be carried out at pressures of 75 to 80 kg / cm 2 .
  • the proportion of glass fibers and / or plastic fibers in a molded part is up to 25% by weight, preferably up to 15% by weight, in order to achieve inexpensive results. At least 1% by weight, particularly preferably at least 5% by weight should be used on glass fibers.
  • Branching off fibers for the production of molded parts from the fibers which are used for the production of MDF or HDF boards for panels, in particular for floor panels, is also particularly economical in comparison to the prior art, regardless of the other measures and features mentioned here ,
  • solid wood components provided with glue are arranged in layers, for example on a conveyor belt, and subjected to hot steam, for example by means of a steam boost. Then the layer is in a
  • the invention is particularly well suited for the production of fiberboard.
  • the two outer main surfaces of the layer are vapor-deposited. This can be done simultaneously with a pre-pressing or compression of the layer. For example, by means of a vapor-permeable conveyor belt, the layered solid wooden components become rigid between two
  • the layer or the already compacted layer of solid wood components provided with glue can be divided so that there are virtually two layers one above the other.
  • the layer is transported on a conveyor belt for this purpose.
  • a belt or a rail is arranged above and across the conveyor belt in such a way that it divides the layer on the conveyor belt.
  • An evaporation device is connected to the strip or to the rail and is located between the two layers in this way.
  • the adjacent sides of the two layers created by division, or at least one of them, is steamed as described above in order to enable faster pressing times. Following this vapor deposition, the upper layer rests on the lower one.
  • the steamed layers are transported to the press and pressed here to the plate.
  • the length of the double belt press systems used can be shortened.
  • the costs for the purchase of the presses are significantly reduced. It can be produced in a smaller space.
  • the significant cost advantages are
  • the pre-steaming can reduce the pressing time.
  • Additives that contribute to curing can also be added to the steam. In this way, the desired hard surfaces are further improved if the surfaces are steamed before the pressing.
  • FIG. 1 shows a section through a belt scale 1 and a subsequent mixer 2. As indicated by the arrow 3, dried fibers, which were produced from wood chips, are fed to the belt scale 1 via an opening in a housing 4. A bevel 5 directs the incoming fibers onto the belt of the belt scale.
  • the belt scale detects and controls the amount of material that is transported in the direction of the three rollers 6.
  • the three rollers 6 are arranged one above the other and offset such that they form an acute angle ⁇ with the belt scale 1.
  • the fibers on the belt scale enter this acute angle. They pass through the rotating rollers 6.
  • a curtain is formed from the fibers, which, due to gravity, is transported vertically downwards along the arrow 7. The curtain thus enters the mixer 2 between a plurality of nozzles 8 and tools 9.
  • the mixer consists of a tubular housing.
  • the housing is formed by a double wall 10 and 11.
  • An axis 12, on which the tools 9 are fastened, is arranged centrally in the interior of the housing.
  • a tool 9 forms a right angle with the axis 12.
  • Four rudder blade-like tools 9 are combined in a star shape. Several of these combined tools are attached to the axis 12 at uniform intervals.
  • the front area, into which the curtain made of fibers is inserted, is free of tools. This ensures that there is a sufficiently large distance between the tools 9 and the nozzles 8.
  • This distance is provided so that glue emerging from the nozzles 8 does not strike the tools directly during operation.
  • the diameter of the housing of the mixer corresponds to the width of the opening through which the curtain consisting of fibers is introduced into the mixer.
  • the width of the curtain is adapted to the width of the opening.
  • the nozzles 8 are semicircular around the axis 12 in an upper area. This has the effect that on the one hand the curtain is evenly provided with glue and on the other hand the glue emerging from the nozzles 8 does not directly hit parts of the mixer.
  • a distance is arranged between the nozzles 8 and the housing 10, 11, so that a kind of annular gap is formed.
  • Air is sucked in through this annular gap. Means for heating the air that is drawn in are not shown. This creates a glue-air mixture.
  • the curtain provided with glue (in other words, a mat formed from fibers) is transported through the mixer 2 by the air flow parallel to the axis 12. The axis rotates during the
  • the glue is further mixed with the fibers.
  • a cooled liquid is introduced between the two walls 10 and 11 of the double wall in order to allow a layer of condensation to form on the inside walls of the mixer.
  • FIG. 2 shows a top view of the mixer parallel to axis 12. For reasons of clarity, only two tools 9 are shown. A single-row, semicircular arrangement of the nozzles in the upper region is illustrated in particular with reference to FIG.
  • Trunks, branches and / or sawmill and industrial rests are used.
  • the wood is first shredded into chips with a size of approximately 20 ⁇ 5 mm in a shredding device 31.
  • These schnitzel can also come directly from the forest or from sawmills. They can be screened to make them too small or too big
  • the chips are the right size, they can be washed to remove foreign especially sand and earth). In this way, cutting and other tools are spared and not damaged in the later manufacturing and processing process.
  • the wood components are fed from the comminution device 31 and from the silo 32 to a funnel-shaped pre-steam container by means of conveyor belts.
  • the feed is typically in the ratio of about 6: 4 (60% by weight of chips, 40% by weight of sawdust). In this way, sawdust is also used. This further reduces costs. Resource resources are conserved. The proportion of chips should predominate, since this creates fibers and later fiber mats that stabilize mechanically. A lower limit for the sawdust content is therefore not to be observed.
  • the wood components are mixed, pre-steamed and heated to 60 to 70 ° C.
  • the wood components are then fed to a cooker 34, for example by means of a stuffing screw.
  • the wood components are cooked in the cooker 34 for about 2 to 3 minutes at a pressure of 11 to 16 bar and a temperature of 140 to 180 ° C. Pressure and temperature are chosen so that a
  • the liquid constituents are separated from the solid and fed to a line 36 which is connected to the cooker 34 in a gastight manner.
  • the solid wood components are fed to a fiberizing machine 36 (refiner or defibrator).
  • the defibration machine 36 typically includes a stator and a rotor that are driven by a motor.
  • the solid components are broken down into fibers.
  • the fibers which in one embodiment are mixed with sawdust, are pneumatically fed to a drying tube 37.
  • fibers are referred to independently of this.
  • the fibers are dried at 160 to 220 ° C. Drying is relatively quick and inexpensive because the liquid wood components have already been removed.
  • the fibers reach cyclones 38 from the drying tube. Here the steam is separated. The fibers are led downwards. The temperature of the fibers is then typically 50 ° C. The fibers are then comparatively cool in gluing devices 39
  • the subsequently glued fibers typically have a temperature of 35 to 40 ° C.
  • the glued fibers enter one or more sifting devices 40.
  • the sifting devices 40 comprise heating devices in order to heat the fibers to 55 to 60 ° C.
  • Increasing the temperature is advantageous if the boards are to be pressed at temperatures above 150 ° C.
  • the pressing step can be accelerated in this way. Shorter press times lead to larger production capacities.
  • the pre-glued fibers are fed to one or more separation devices 41.
  • the pre-glued fibers arrive at the scattering station 42 from the separating devices 41.
  • the scattering station 42 places the pre-glued fibers on a conveyor belt.
  • the conveyor belt leads the fibers to a pre-press 44.
  • Fibers typically pre-pressed to 2/3.
  • the pre-press comprises a circumferential belt between which the fibers are fed and thereby be pressed.
  • the fibers then pass through a forming line 45 which has various facilities which ensure that the fibers are in the desired shape.
  • the molding line leads to an evaporation device 46.
  • the fibers are evaporation from above and / or below.
  • the fibers can be split parallel to the conveyor belt and thus steamed inside.
  • the fibers finally reach the main press 47, which consists of two rotating steel bands pressed against each other. Typically, the pressing takes place here above 150 ° C.
  • the plates are then sawn by means of a sawing device 48 and fed to a holding device 49.
  • the plates are held in the holding device in such a way that they do not touch.
  • the plates are cooled in this way.
  • the separated liquid constituents which were fed to line 35, are cooled within the gas-tight system. If these liquid components have been cooled sufficiently, they are either disposed of or
  • the panels are then processed into panels, for example.
  • the plates are coated with paper, sawn further and provided with coupling elements by milling.
  • the panels can serve as coverings for walls or floors.

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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

L'invention concerne un procédé destiné à la production d'un élément de construction réalisé en fibres de bois, copeaux de bois et/ou sciure, notamment un panneau. Ce procédé consiste: - à appliquer de la colle sur des fibres de bois, des copeaux de bois et/ou de la sciure, - à comprimer les fibres de bois, les copeaux de bois et/ou la sciure enrobés de colle pour former un élément de construction, notamment un panneau. Les fibres de bois, les copeaux de bois et/ou la sciure sont d'abord décomposés par cuisson en constituants solides et fluides. Avant de quitter le système étanche au gaz, les constituants fluides sont séparés et refroidis dans ce système fermé étanche au gaz. Cela permet de réduire fortement la nuisance olfactive pendant la production. L'invention concerne également un dispositif permettant de mettre en oeuvre le procédé et les composants produits selon l'invention.
EP02794508A 2001-08-01 2002-07-18 Panneau realise dans un materiau derive du bois et de production ecologique Expired - Lifetime EP1414629B8 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02794508A EP1414629B8 (fr) 2001-08-01 2002-07-18 Panneau realise dans un materiau derive du bois et de production ecologique

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE20112599U 2001-08-01
DE20112599U DE20112599U1 (de) 2001-08-01 2001-08-01 MDF-Platte nebst Herstellung
PCT/EP2001/009472 WO2003013808A1 (fr) 2001-08-01 2001-08-16 Panneaux mdf et leur procede de production
DECT109472Q 2001-08-16
DE20210718U 2002-07-10
DE20210718U DE20210718U1 (de) 2002-07-10 2002-07-10 MDF-Presstechnologie
PCT/EP2002/008003 WO2003013809A1 (fr) 2001-08-01 2002-07-18 Panneau realise dans un materiau derive du bois et de production ecologique
EP02794508A EP1414629B8 (fr) 2001-08-01 2002-07-18 Panneau realise dans un materiau derive du bois et de production ecologique

Publications (3)

Publication Number Publication Date
EP1414629A1 EP1414629A1 (fr) 2004-05-06
EP1414629B1 EP1414629B1 (fr) 2011-10-19
EP1414629B8 true EP1414629B8 (fr) 2012-04-18

Family

ID=56290314

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Application Number Title Priority Date Filing Date
EP02794508A Expired - Lifetime EP1414629B8 (fr) 2001-08-01 2002-07-18 Panneau realise dans un materiau derive du bois et de production ecologique

Country Status (1)

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EP (1) EP1414629B8 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016079124A1 (fr) 2014-11-17 2016-05-26 Metadynea Austria Gmbh Procédé de pressage à basse température
CN114059372A (zh) * 2020-07-31 2022-02-18 赵明智 一种干法造纸技术

Also Published As

Publication number Publication date
EP1414629A1 (fr) 2004-05-06
EP1414629B1 (fr) 2011-10-19

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