DE10061072A1 - To coat dry fibers with glue, for the production of fiberboards, they are carried through a shaft against the shaft wall by the centrifugal action from a rotating roller with surface pins, to be sprayed and ejected from the shaft outlet - Google Patents

Abstract

To apply a glue to fibers, for the production of fiberboards, the dry fibers (14) are fed by a dosing unit through a feed shaft (10) under an underpressure to a fiber roller (17). The surface of the roller has a number of pins (18), so that the roller rotation moves the fibers between a section (20) of the roller surface and a part-wall section (21) of the shaft and the shaft section (22) defining the glue application unit. The fibers are accelerated to the surface speed of the roller by the pins and the generated air stream, with a centrifugal action to hold the fibers at the wall without contact with the pins. The glued fibers are coated at the wall section or near its end, to emerge from the shaft outlet opening (23). To glue fibers, for use in fiberboards, a guide plate ramp at the shaft wall can deflect the fibers back to the roller pins, before separating to the shaft wall again. The shaft wall or its leading section, to carry the fibers, starts after about \4 of the fiber roller circumference. The fibers are coated by slit glue applicator jets (26) or spray jets. The fibers lie on a gluing board at the slit jets or after the spray jets. The gluing board has a profiled surface e.g. with fins, needles or steps, and is pitched at an angle to the fiber flow to deflect the fibers and press them against the board to be caught again by the roller pins. At the slit applicator jets, the fibers strike the gluing roller (45) at a tangent to the fiber flow direction, or they strike the gluing roller in the flow direction when using spray jets. On striking the gluing roller, the fibers are deflected to be caught by the roller pins. The surface of the gluing roller is smooth, or it is profiled e.g. with fins, needles or steps, radial or axial grooves or hemispherical depressions.. The gluing roller is cleaned continuously by a rotating brush (48) with water. The used water is returned to the glue preparation station, to be used as glue diluting water for application to the fibers. The fibers can be coated with a glue by a roller, where a part of its mantle surface defines a shaft section, where the glue is transferred by friction to the fibers. The gluing roller can be next to a glue bath, where the glue is transferred on to the mantle surface as a glue film by immersion. The application of glue to the fibers can be set by a belt weighing scales at the fiber dosing unit feed, which gives the rotary speed required by the gluing roller. The glued fibers are fed separately to an accelerator. The fibers leave the shaft outlet opening on a horizontal movement path, and are then deflected downwards by suction, and they can be coated with glue at the deflection point by spray jets which deliver glue and air. The fiber flow can be deflected in a channel by a pneumatic carrier system, with two facing rows of spray jets for the fibers to travel between them. The speed of the fiber movement, on striking the gluing roller, is set by the level of the underpressure in the feed shaft. The fibers can be divided into two symmetrical flow streams, to be coated with glue, and then beat against each other after they emerge from the shaft outlet opening. The fibers are sifted directly after gluing. An Independent claim is included for an assembly to coat fibers with glue, for fiberboards, with a feed shaft for a dosed delivery of fibers to a fiber roller fitted with surface pins. The fibers are carried through, with centrifugal force to hold them against the shaft wall, to be coated with a glue application before passing out through the shaft outlet opening.

Description

The invention relates to methods and devices for gluing from to position of fiberboard provided, dried fibers, after the The preamble of claim 1 and claim 24. The fibers are in front preferably made of lignocellulosic and / or cellulosic materials. Both Fiberboard is light, medium-density or high-density fiber plates.

It is customary to glue fibers which are provided for the production of MDF or HDF boards in the wet state. With this so-called blow-line gluing, the binder is sprayed into a blowing tube ending in the entrance area of the tube dryer behind a refiner on the wet, still hot fibers. The fibers are then dried. The blow-line gluing enables uniform fiber gluing and thus avoids lumping by fibers and glue. A major disadvantage of blow-line gluing is, however, a relatively high glue consumption (see, for example: Buchholzer, P., "Glue losses on the track", pp. 22-24, MDF magazine 1999 , :). The increased consumption of glue is caused by the fact that part of the reactivity of the glue is lost during the drying process of the fibers due to the high temperatures. For example, in the dryer system the emission of formaldehyde resulting from the glue is considerable, which means that complex pollutant minimization is required. Another disadvantage of blow-line gluing is that the fibers glued in this way have a low cold tack due to pre-curing in the dryer, so that a fiber fleece formed from the fibers has a large springback tendency after pressing. This can lead to the destruction of the fiber fleece structure when pressing the fiber fleece due to a high air displacement from the Fa servlies.

The disadvantages of blow-line gluing can be achieved by gluing from in dry condition. So it is known, dried company glue in a mixer. The dry gluing of fibers in Mi However, shear has the disadvantage that fiber agglomerates and entanglements arise that lead to an uneven fiber gluing and an un desired formation of glue stains in the board surfaces (see a. a. O.). A dry gluing machine with mixing tools hen can be z. B. described in EP 0 744 259 B1.

EP 0 728 562 A2 describes a process for dry gluing of fibers is known in which in a pneumatic conveyor line by generating a high turbulence a loosening of the fiber flow due to reduced Flow rate occurs and the fibers in this loosening zone can be wetted by spraying.

DE 199 30 800 A1 describes a method for dry gluing of fibers described, in which the gluing in an end portion of a Rohrtrock ners takes place. About this procedure u. E. no experience yet industrial testing. A disadvantage of this method appears that a very high proportion of hot gas and steam together with the company must pass through the gluing zone as it is imperative that the glue on the smallest particles when it is injected into the gluing zone is atomized. With this high proportion of hot gas and water vapor, which at the process immediately after the gluing process using a cyclone is separated from the fibers, it can be assumed that part of the glue with the hot gas and the water vapor from the fiber mixture into the At atmosphere escapes. Furthermore, prob leme in terms of the uniformity of glueing given the he witnessed random air turbulence. Furthermore he  The drying moisture of the fibers seems difficult with this process within the very important tolerances of + / ¾0.5 for the further process Keep% of setpoint under control.

The invention has for its object, with high uniformity as possible to wet much surface of the fibers with binder.

With regard to the procedure, this task is characterized by the features of the An spell 1 solved. The fibers are passed through by a metering device a feed shaft of a fiber roller loaded with negative pressure leads, which is provided on its surface with a variety of pins that preferably taper conically in the radial direction. The fiber roller ro so that the fibers are deflected by the pins and along one Manhole section are guided by a portion of the circumference the fiber roller and through an opposite wall and the fiber roller opposite glue is limited. The company by the pins and by an air flow generated by them on approximates the peripheral speed of the fiber roller. Through the Centrifugal force remove the fibers from the fiber roller and lie down against a section of the wall, being no longer in contact with the pins Come into contact. In the area of this wall section or adjacent the fibers are glued to one end of the wall section before they emerge from an outlet opening of the shaft section.

The fibers leave the feed chute in a fiber stream and meet the fiber roller. By the action of the fast rotating fiber Rolled pins are not only deflected the fibers, but also greatly accelerated, causing irregularities such as fiber agglomerates be eliminated. Furthermore, the fiber flow is accelerated by the Fibers in the direction of flow many times more than the fibers in stretched the feed shaft. At the same time, the pressure with which the  Fibers during transport through the shaft section against the tub be pressed, the bulk density of the fibers, for example on the triple the bulk density of the fibers inside the feed chute. Accordingly, the fiber flow height is reduced with increased bulk density. The stretching of the fiber stream and the reduction of its height enable effective gluing of the fibers. In addition, an even Fa Serbeleimierung ensures that the fiber roller the fiber stream prepared for existing irregularities. Because the glued Fibers not subjected to a mixture will cause internal pollution a gluing device used largely avoided.

Preference is given to achieving a uniform fiber gluing hen that the fibers from the dosing bunker, which is an integrated mass Can have mood device in a uniform over the width Mass flow of the fiber roller fed and trans through the shaft section be ported, d. H. that the length of the fiber roller and the width of it closing shaft section in which the glueing means are arranged, correspond to the width of the fiber stream.

The speed of rotation of the fiber roller and thus the acceleration of the Fibers through this roller is preferably chosen so that the fibers about a quarter of the circumference of the fiber roller after the fibers hit it lay on the fiber roller against the wall of the shaft section. In Be rich this wall section or at one end of the wall section According to the invention, the fibers are glued. The gluing on End of the wall section and thus immediately before the Fibers from the shaft section prove to be advantageous in that that the shaft section is hardly contaminated by the glued fibers that can.

Gluing can be done using glue slot nozzles. From this glue slot the glue is pumped into the shaft section so that the glue  flows out of the slot nozzles and through the shaft section transported fibers due to friction. Thereby, that the fiber stream is so strongly resolved and a very large fiber surface provides an appropriate dosage of the glue high uniformity of fiber gluing can be achieved. With an arrangement tion of the glue slot nozzles within the wall section are in the Wall section gluing slots are provided in which the outlet opening openings of the glue slot nozzles are arranged. The glue slot nozzles offset in two planes across the entire width of the Shaft section can be arranged in order to ensure sufficient Stability of the wall of the To ensure shaft section. The fibers preferably meet in the loading the glue slot nozzles on a gluing board, which when the Glue slot nozzles at the end of the wall section over the can extend the entire width of the shaft section. Through the Belei the fiber stream is deflected, causing the fibers to exert pressure exert on the glue board. By applying glue through the glue slot nozzles the gluing board flows and mechanical abrasion due to the fiber pressure done on the surface of the gluing board by the fibers the glue board instead of a glue absorption of the fibers.

The gluing board preferably has a profile Surface on. This profile can be, for example, a finnenar active profile, a nail-like profile or a stair-like profile. By the respective profile is experienced by the fibers hitting the gluing board an increased friction on the gluing board and are reversed several times directs. The deflection results in a swirling of the fibers and thus in a static mixing of the glue with the fibers. Because of the he Increased friction and static mixing is the gluing effect clearly improved. However, a smooth surface of the belei is also possible mung bretts.  

The gluing board can preferably be at an angle to the direction of flow of the Fibers can be adjusted to make the fibers in the desired Way and redirect the desired pressure of the fibers on the belei to be able to adjust the board.

Alternatively, it can be provided that the fibers in the area of the glue slot nozzles tangential to a belt rotating in the direction of movement of the fibers mung roller, which is just below the level of the glue slot nozzles is ordered. The gluing roller serves as a rotating gluing board and therefore preferably has one like the fixed gluing board Surface that is provided with a profile, for example with a fin nen-like profile, a nail-like profile or a stair-like profile. This profiled gluing roller also results in an increased rei Practice the fibers on the gluing roller and a multiple deflection of the Fibers, which in turn mixes the glue very effectively the fibers is reached. Alternatively, the surface of the gluing roller also be smooth and level. Preferably the surface is the Belei Mung roller chrome-plated.

The gluing roller forms part of the boundary of the shaft section If the gluing roller is arranged at the end of the shaft section , it ensures that there is no internal contamination of the wall of the Manhole section arises from possible contamination by glue residues in the immediate area of the glue transfer to the fiber stream by the rotation of the gluing roller from the Belei area are transported out. By avoiding one Ren pollution of the shaft section is the result of the formation of Fiber agglomerates minimized.

It can be a continuous cleaning of the gluing roller by a rotie rende brush can be provided with a cleaning water reservoir in  Contact is. The cleaning water can be supplied to a glue processing system leads and be used as glue water within this.

To accelerate the pressing process when pressing the glued Fibers to fiberboard are usually beige glue accelerator mixed. Such an accelerator, the proportion of which is usually 2 to 5% on the solid resin content, can on the surface of the gluing roller can be applied, for example, by means of spray nozzles. The speed of the In this case the roller has to match the amount of accelerator to be metered be true. Such a separate metering of the accelerator can compared to applying the accelerator to the fibers in Vermi with the glue via the glue slot nozzles the degree of contamination of the device used for gluing can be reduced.

As an alternative to gluing using the glue slot nozzles, the fibers can can also be glued by means of a glue roller, with a partial area of a The surface of the casing limits the shaft section in such a way that due to Friction between the fibers and the cladding surface glue on the fibers is applied. The glue roller is preferably adjacent to the end of the Wall section, against which the fibers lie, arranged and be borders the shaft section at its outlet opening so that the along of the wall section sliding fibers approximately tangentially to a part of the Hit the surface of the glue roller.

The surface of the glue roller can be opened with different profiles be made of glue. For example, radial grooves, axial grooves or depressions in the form of ball indentations may be provided. The The surface of the glue roller can also be smooth and even. You be is preferably made of a hard, friction-resistant material, such as. B. Hartver chrome plating.

The glue roller can be used in combination with a glue application roller Principle of glue application rollers for liquid substances, such as those used in painting lines  the panel painting are used, work. Here is the glue application roller arranged adjacent to the glue roller and bounded with this a glue bassin. There is a gap between the two rollers through which counter-rotation of the two rollers on a glue film on the glue roller will be carried. Because the thickness of the glue film on the glue roller by the size the gap between the glue roller and the glue application roller is determined, the gap can be adjusted by shifting the axis of the glue application roller be cash. The conveying capacity of the glue roller or that transferred to the fibers Glue quantity is also determined by the speed of the glue roller. In the Calculation of the glue volume per roll revolution is included with glue rolls profiled jacket surface to account for the volume of the profiles into account. The addition of glue to the fibers can be done in this way in Ab dependence on the fiber throughput of a belt scale in the dosing device be managed.

It can also be provided that the glue roller by immersing the Roll of glue is applied to a glue container.

If the glue roller in the area of the wall section against which the Laying fibers due to centrifugal force can be a glue sin be provided by the outer surface of the wall of the shaft cut and is limited by a part of the surface of the surface of the glue roller. By turning the glue roller against the direction of rotation of the fiber roller Glue from the glue pool from the glue roller that passes through an opening in the Wall protrudes somewhat into the shaft section, to which fibers are transferred. If the glue roller is profiled, a scraper can be provided, which limits the glue pool instead of the wall of the shaft section and ensures that glue enters the shaft section when the jacket surface enters is only present in depressions in the surface of the jacket.

In all of the described cases, the use of a glue roller takes place Application of the glue to the fibers by mechanical abrasion. Doing so  the friction due to the difference in the speed of the fiber flow and the speed of the glue roller.

As an alternative to adding an accelerator directly, the described a method of accelerators using a glue roller also separately via nozzles or via an accelerator application roller Fibers are applied.

In the processes described, the fiber throughput is high speed and the amount of fiber flow in the chess section selected so that optimal glue application at the point where fibers and glue come into contact takes place.

The above object is further achieved by the method Features of claim 18 solved. In this process too, the company from a metering device through a feed shaft of a fiber roller fed, which on their surface with a variety of preferably koni is provided. Rotation of the fiber roller turns the fibers again deflected into a shaft section and through the pins and one air flow generated by the pins to approximately the circumferential speed speed of the fiber roller accelerates. The shaft section is divided by a part cut the circumference of the fiber roller and an opposite wall limited. The fibers occur in an outlet opening of the shaft section Mainly in the horizontal direction of movement and then sucked down and thereby deflected. In the deflection area Fibers using at least one spray nozzle, the glue and air under pressure impact ejects, glued.

In this process, the fibers are processed by the fiber roller as in the method according to claim 1, d. H. it finds a resolution of Un uniformity in those arriving at the fiber roller in a stream Fibers and an extension of the fibers instead. This way it is ensured  that the fibers in the deflection area are very finely distributed and therefore very provide a large contact area for the glue emerging from the spray nozzles.

The fibers can be in a channel of a pneumatic transport direction are diverted, whereby in the deflection area by opposite arranged spray nozzles the glue is sprayed onto the fibers.

In both methods according to the invention it can be provided that the Ge speed at which the fibers hit the fiber roller by adjustment of the negative pressure prevailing in the feed shaft can be determined.

Furthermore, both methods can be used in such a way that symme fiber streams arranged opposite one another are provided, in which the fibers are glued using the same method, the company flows after exiting the outlet opening of the shaft section each bounce. Such a double gluing process is especially for high fiber throughput rates of up to 30 t atro / h are suitable. Because the Fiber streams collide head-on after glue application, what before preferably takes place when entering an air transport shaft a good remixing of the fibers.

The described gluing processes can also be used directly Connect sighting of the fibers. In this case, the different Throwing distance of particles of different mass when exiting the Manhole section used for air fiber sighting.

However, it can relate to the particular gluing process according to the invention also connect an independent process for fiber screening. With such An air fiber screening method can be, for example, the one in the German patent application 100 25 177.3 described fiber sighting Ver drive, which is a process for resolving irregularities in one Fiber flow precedes, act. But it can also be the formation of a  Connect nonwoven fabric, for example according to the Deut mentioned The method described in the patent application.

Stepwise gluing of the fibers can also be provided in such a way that that the fibers are first in one of the gluing processes described above drive that has no immediately subsequent sighting of the fibers sen, reduced in a desired based on the final gluing state dimensions are glued and in a further subsequent loading sizing process which, as described above, provides an immediate sighting of the Fibers are glued again to the desired end stood to achieve glueing. For example, with a he desired solid resin content of 10% based on atro fibers 5% solid resin first gluing stage without fiber classification and 5% solid resin the second Gluing stage with fiber classification can be assigned. The advantages of this Fiber gluing in stages consists in that less glue throughput per Gluing level and therefore required per individual gluing device is what leads to a reduction in the formation of lumps by fibers and glue, further in that a better glue distribution on the fibers through multiple Glueing and mixing takes place and a reduction of the internal Ver soiling of the individual gluing device through a reduced glue Fiber ratio per gluing stage.

Step-by-step gluing in more than two steps can also be provided his. Furthermore, gluing can also be carried out in two gluing processes, for example levels are carried out at which there is no immediate sighting followed.

The above object is achieved with regard to the device by the Merk male of claim 24 solved. Essentially the same results here Advantages as previously mentioned in connection with claim 1. Preferred embodiments of the device are in claims 25 to 38 listed.  

The task is also with regard to the device by the features of Claim 39 solved. Here, too, essentially the same result Advantages as previously mentioned in connection with claim 18. Preferred embodiments of the device are in claims 40 to 42 listed.

The device according to claim 43 serves the step-by-step described above glueing of the fibers. This is followed by a gluing device a gluing device with fiber sifting without fiber sifting. in this connection the advantages mentioned above in connection with claim 23 result.

The invention is explained in more detail below with the aid of exemplary embodiments refines, reference being made to the figures. Show it:

Fig. 1 shows schematically a partial view of slot nozzles of a glue applicator with a glue,

Fig. 2 is a schematic partial view of a slot die a glue applicator with a glue and a rotating glue application roll,

Fig. 3a shows schematically a partial view of a glue applicator with a glue roller,

FIG. 3b schematically a section of a surface profile of the glue roller shown in Fig. 3a,

Fig. 4 schematically shows a partial view of a gluing device with Leimsprühdüsen,

Fig. 5 schematically shows a partial view of a gluing device, in which two symmetrically opposite fiber streams are hen vorgese, and

Fig. 6 shows schematically a partial view of a gluing device with integrated fiber sifter.

Fig. 7a schematically illustrates a detail of a fin-like profile of the surface of the Beleimungsbretts of FIG. 1 or the glue application according to Fig. 2 in top view,

FIG. 7b, the fin-like profile in accordance with Fig. 7a in section,

Fig. 7c schematically a section of a nail-like profile of the surface of the Beleimungsbretts of FIG. 1 or the glue application according to Fig. 2 in top view,

Fig. 7d the nail-like profile in accordance with Fig. 7c in section,

Fig. 7e schematically a detail of a step-like profile of the upper surface of the Beleimungsbretts of FIG. 1 or the glue application according to Fig. 2 in top view,

Fig. 7f the stair-like profile in accordance with Fig. 7e in section, and

Fig. 8 schematically shows a partial view of a gluing device for stufenwei sen gluing.

The gluing device according to FIG. 1, a discharge to a dryer 1 of a fiber connected fiber Querverteilungseinrich not shown device 2 on. To the transverse distribution device 2 to a dosing bin 3 follows, which is filled by the transverse distribution device 2 uniformly with dried wood fibers. 4 The wood fibers 4 are fed to a dosing hopper discharge with discharge rollers 6 by means of a base belt 5 . From the support rollers 6 larger clumps of the fibers 4 are dissolved. The floor conveyor 5 runs over a weighing device 7 , which continuously records the running fiber throughput weight (weight per unit of time).

From the dosing hopper discharge, the fibers 4 enter a feed shaft 10 , which is formed from two mold walls 8 and 9 and has an air supply 11 at an upper end.

By a fan 12 of a pneumatic transport device 13 , which is only partially shown in Fig. 1 with a part belonging to the gluing device, a mixture of fibers and air is sucked into the feed shaft 10 , the fibers in a fiber stream 14 increased ent long the mold wall 9 and the air increasingly moves in an air flow along the mold wall 8 . On the mold wall 9 , an electromagnet 15 is attached to the separation of metal parts from the fiber stream 14 .

In the area of an outlet opening 16 of the feed chute 10 , the fiber stream 14 encounters a fiber roller 17 , which serves to resolve irregularities in the fiber stream 14 and to accelerate the fibers in the fiber stream 14 . On the surface of the fiber roller 17 , a plurality of pins 18 is angeord net, which taper conically to a tip with increasing distance from the axis of rotation of the fiber roller 17 . The fiber roller 17 rotates at high speed in the direction of rotation indicated by the arrow 19 . To start speed of the fiber roller 17 is variable and can be 20 to 100 m / sec. The diameter of the fiber roll 17 may for example be 1000 mm and the length of the fiber roller 17, for example 1800 mm. In this case, the conical pins 18 are approximately 10,000 pieces.

A portion 20 of the fiber roller circumference, one of the fiber roller 17 against the opposite wall 21 and glueing agents described below limit a shaft portion 22 which extends approximately from the outlet opening 16 of the feed shaft 10 to the lowest point of the fiber roller 17 and has an outlet opening 23 there . The course of the wall 21 is designed in a way, the distance between the tip of the pins 18 and the wall 21 of one of the exit opening 16 of the feed chute that 10 adjacent entrance opening 24 of the chute section progressively increased up to the outlet opening 23 of the 22nd The wall 21 is ver seen on an outer side Chen wesentli over its entire length with a water-cooled cooling jacket 25 .

In the region of the outlet opening 23 , a series of glue slot nozzles 26 is arranged over the entire width of the shaft section 22 . The exit openings of the glue slot nozzles 26 are located in a gap 27 which is formed by a lower end of the wall 21 and a gluing board 28 . Each glue slot nozzle 26 is supplied with glue from a glue extraction container 31 , which has a glue extraction scale 32 , by a separate displacement pump 29 via a connecting hose 30 . For example, with a process width of 1800 mm, 25 glue slot nozzles 26 with a slot length of 72 mm and a slot width of 2 mm are provided. The number of slot nozzles 26 can be changed as desired. The glue pumps 29 are preferably driven via a common drive shaft 33 and a common drive 34 . This ensures a uniform throughput of all glue pumps 29 . Individually driven glue pumps are also possible. The gluing board 28 , which closes directly to the glue slot nozzles 26 , is arranged over the entire width of the shaft section 21 . It is adjustable in its angle to the shaft section 22 .

The gluing board 28 has on its surface the fin-like profile according to FIGS . 7a and 7b. The fin-like profile consists of elevations 101 with a base portion 102 and a vertical to the lighting board 28 arranged sheet portion 103 . The base section 102 has an elongated base surface with concavely curved side lines which converge at the ends of the base surface. The elevations 101 are arranged in parallel rows 104 which are arranged perpendicular to the direction of movement of the fibers marked with the arrow 105 . In each of the rows 104 , the elevations are aligned in the same way, namely at an acute angle to the direction of movement 105 , that is to say the working direction of the gluing board 28 . Depending on the row, the elevations 101 of the rows 104 alternately have a positive acute angle or a negative acute angle with the direction of movement 105 , the rows 104 being arranged offset to one another.

Alternatively, the gluing board 28 can also have the nail-like profile according to FIGS. 7c and 7d. This nail-like profile consists of conical nails 106 , which in turn are arranged in rows which are offset from one another perpendicular to the direction of movement 105 . Furthermore, the upper surface of the gluing board 28 can also have the step-like profile according to FIGS. 7e and 7f. In this step-like profile 105 rising steps 107 are provided in the direction of movement.

The shaft section 22 opens into the pneumatic transport device 13 . The speed at which the fiber stream 14 moves in the feed shaft 10 towards the outlet opening 16 can be adjusted via an air throttle 35 in an upper channel section 40 of the pneumatic transport device 13 by a negative pressure generated by the fan 12 in the region of the fiber roller 17 is changed.

Characterized in that the stream of fibers 14 in the region of the outlet opening 16 meets the high-speed rotating fiber roller 17 and the pins 18 have a right angle to the movement direction of the fiber stream 14 Geschwindigkeitskom component, continuous or clumped fibers are separated from each other, wherein individual fibers through the fiber roller 17 are hardly damaged.

Furthermore, the fibers are deflected by the fiber roller 17 into the shaft section 22 . In the first part of the shaft section 22 , due to the inertia of the fibers, in addition to combing the fibers and the associated loosening of fiber lumps, the fibers are accelerated to approximately the circumferential speed of the fiber roller 17 . This fiber speed is reached in this gluing device after about a quarter of the circumference of the fiber roller 17 . In this area of the shaft section 22 , the fibers in a fiber stream 36 are stretched to a multiple of the fiber stream 14 in the feed shaft 10 . Due to the large number of conical pins 18 , an air flow is generated in the shaft section 22 which corresponds approximately to the initial speed of the fiber roller 17 . Due to the radial forces of air and fibers, the fibers in the shaft section 22 centrifugally outward and lie against an inside of the wall 21 of the shaft section 22 , so that the conical pins 18 of the fiber roller 17 after about a quarter of the circumference of the fiber roller 17 in Manhole section 22 are no longer in contact with the fibers.

The dissolution of the fiber stream 36 caused by the stretching of the fibers and the glue transfer provided over the entire width of the fiber stream 36 result in a large contact area for the glue pickup.

The gluing board 28 is used to deflect the fiber stream 36 in the plane Chen Zei. The fibers exert a pressure on the gluing board 28 which can be adjusted by adjusting the angle of the gluing board 28 to the shaft section 22 . The inclusion of glue 37 by the fibers is caused by mechanical abrasion of the glue 37 on the gluing board 28 . The fin-like profile significantly increases the friction of the fibers on the surface of the gluing board 28 compared to a smooth surface. The alternating oblique arrangement of the elevations 101 also results in a multiple deflection of the fibers, and since static mixing of the fibers and the glue 37 is achieved. In this way, the fibers are glued very effectively. A similar effect is achieved with the nail-like profile described above. If the surface of the gluing board 28 is provided with the step-like profile described above, the friction of the fibers on the gluing board 28 is increased in particular. However, a swirling occurs through the steps 107 and thus in turn a static mixing of the fibers with the glue 37 . The glue metering is carried out according to a predetermined percentage of glue based on atro fibers in relation to the fiber throughput, which is recorded via the weighing device 7 of the dosing bunker 3 .

After gluing, the fibers emerge from the shaft section 22 and are deflected by gravity and by transport air flowing in the direction of the arrow 38 into a suction hood 39 of the pneumatic transport device 13 below the fiber roller 17 . The transport air is preferably return air guided in a closed circuit or fresh air.

In all drawing figures, the same parts with the same reference numbers are verse hen.

The embodiment according to FIG. 2 also has glue slot nozzles 26 arranged adjacent to the outlet opening 23 of the shaft section 22 . Adjacent to the glue slot nozzles 26 is a gluing roller 45 , which limits the shaft section 22 at its outlet opening 23 . The gluing roller 45 protrudes somewhat with a jacket surface 46 into the shaft section 22 , so that the fiber stream 36 hits the jacket surface 46 tangentially. The glue slot nozzles 26 are arranged in one plane over the entire width of the fiber roller 17 and aligned so that they emit the glue 37 approximately parallel to the fiber stream 36 that hits the fiber roller 17 .

The gluing roller 45 serves as a gluing board rotating in the direction of arrow 47 . Its jacket surface 46 , like the gluing board 28, is provided with the fin-like profile according to FIGS . 7a and 7b. Alternatively, the nail-like profile according to FIGS. 7c and 7d or the step-like profile according to FIGS. 7e and 7f can also be provided. The advantageous effects of these profiles in the gluing roller 45 are the same as in the gluing board 28 described above. The jacket surface 46 is chrome-plated. The off opening 23 approximately diametrically opposed adjacent to the Belei mung roller 45 is a rotatable brush 48 is arranged which is in contact with the circumferential surface 46 and a reservoir 49 with cleaning water and rotated in the same rotational direction as the fiber roller 17th Due to the nature of the jacket surface 46 and the rotational movement of the gluing roller 45 possible contaminations by glue residues in the immediate area of the glue transfer to the fiber stream 36 are transported out of the gluing area and cleaned in a continuous manner via the brush 48 . In this way, internal contamination of the shaft section 22 is avoided and the formation of fiber agglomerates is thus minimized.

Furthermore, a row of spray nozzles 50 (only one is shown) is arranged adjacent to the gluing roller 45 , with which an accelerator can be applied to the jacket surface 46 of the gluing roller 45 . Instead of the spray nozzles 50 , other atomizers can also be used. The spray nozzles 50 are each connected via a connecting hose 51 to a trigger container 53 for an accelerator which has a trigger scale 52 . The accelerator is driven by a motor 54 pumps 55 (only one is shown) sen from the trigger 53 to the container transported Sprühdü 50, which are arranged on the entire width of the gluing roller 45th

The gluing roller 45 protrudes with its jacket surface 46 into the suction hood 39 , which is slightly angled to the upper channel section 40 of the pneumatic trans port device 13 .

The gluing device according to FIG. 2 has the same, but not shown, means for introducing the fibers into the feed shaft 10 as the gluing device according to FIG. 1.

The embodiment according to FIG. 3 is similar to the gluing device according to FIG. 1. However, there are differences in the means for gluing the fibers. The gluing device according to FIG. 3 has a glue roller 60 which operates on the principle of liquid application rollers and which delimits the outlet opening 23 of the shaft section 22 and in this case projects into the latter with a partial section 61 of a jacket surface 62 over the entire width of the shaft section 22 . The outer surface 62 of the glue roller 60 is formed with recesses 63 in the form of ball indentations, as shown in section in FIG. 3b. The depressions 63 are dimensioned according to the required glue throughput. In the present case, the glue roller has an outer diameter of approx. 500 mm and rotates at 60 rpm. The diameter of the recesses 63 is 10 mm and the depth 1 mm. But other profiles can also be provided, such as. B. radial grooves or axial grooves, and the jacket surface 62 may also be smooth and flat. It is made of a hard, friction-resistant material, such as. B. hard chrome plating. The glue roller 60 works in combination with a glue application roller 64 , which is arranged adjacent to the glue roller 60 and forms a glue basin 65 with it. Glue can be supplied to the glue pool 65 via a glue supply line 66 . There is a gap 67 between the glue roller 60 and the glue application roller 64 .

With a further section 68 of its jacket surface 62 , the glue roller 60 projects into a glue container 69 which has a first glue overflow 70 and a second glue overflow 71 .

The glue roller 60 can be rotated about its longitudinal axis, as indicated by the arrow 72, both with and counter to the direction of flow of the fiber stream 36 . In the direction of rotation against the fiber stream 36 , the glue roller 60 fetches the glue from the glue pool 65 , the glue application roller 64 rotating counter to the glue roller 60 . This creates a glue film on the glue roller 60 . Whose thickness can be determined via the gap 67 between the glue roller 60 and the glue application roller 64 which can be adjusted in terms of its strength by shifting the glue application roller 64 . If the glue roller has a smooth jacket surface 62 , the glue film can e.g. B. have a thickness of 0.2 mm.

If glue is to be applied to the fibers from the glue container 69 instead of the glue basin 65 , the glue basin 65 is emptied and the glue application roller 64 is positioned at a greater distance from the glue roller 60 . In this case, the glue roller 60 rotates with the fiber stream 36 , and the glue fill level in the glue container 69 is maintained at a level 73 by means of the glue overflow 71 , at which the glue roller 60 is immersed in the glue. The glue container 69 is also filled via the glue supply line 66 . If the glueing of the fibers is carried out via the glue basin 65 , the glue fill level in the glue container 69 is kept at a deeper level 74 by means of the glue overflow 70 , at which the glue roller 60 does not dip into the glue. The glue flowing out of the glue overflows 70 and 71 runs back into a glue preparation device, not shown, for reuse.

In this gluing device too, the glue is absorbed by the fibers by mechanical abrasion, in that the fiber stream 36 essentially meets the glue roller 60 tangentially at the contact point designated by the reference numeral 75 .

The regulation of the glue application by means of this gluing device takes place as follows: The weighing device 7 minus the known fiber moisture determines the current atro fiber weight in kg / h gravimetrically. The volume of the glue liquor, which has a solid resin content of z. B. 65%, is based on one revolution of the glue roller 60, the volume of the sum of the recesses 63rd The constants solid resin content of the glue liquor, specific weight of the solid resin and glue liquor volume of a roll revolution give the solid resin content of a roll revolution in kg per revolution. Thus, by changing the speed of the glue roller 60, the addition of solid resin to dry fibers in kg / h is regulated depending on the fiber throughput of the weighing device 7 .

In the Beleimungsvorrichtungen according to FIGS. 1 to 3, for example, in the field of sizing agents a stretched fiber flow area of about 94 m ² / sec can be achieved.

The embodiment according to FIG. 4 is similar to the gluing device according to FIG. 1 and only differs in the means for gluing.

In a wall provided with corresponding openings 80 from the suction hood 39 , two rows of two-substance spray nozzles 81 and 82 are arranged opposite one another, which are used to glue the section 22 emerging from the shaft 22 with the reference number 83 by expelling glue and air are provided. The fibers 83 are deflected in the transition from the shaft section 22 to the suction hood 39 and spatially expanded due to different weights. This creates a large contact area of the fibers 83 for the application of glue. As in the gluing device according to FIG. 1, the spray nozzles 81 , 82 are each connected to a separate glue pump (not shown) via a connecting hose. The spray nozzles are supplied with glue liquor in the same way as in the gluing device according to FIG. 1. The air required by the spray nozzles 81 , 82 is made available from a general air supply.

Fig. 5 shows a gluing device, which is symmetrical with respect to a longitudinal axis of a subsection of the pneumatic transport device 13 . On both sides of the longitudinal axis there is a gluing unit 86 and 87 , which corresponds in principle to one of the gluing devices according to FIGS. 1 to 4. The gluing means can thus be designed differently in accordance with these described gluing devices and are therefore not shown in FIG. 5. The same parts of the two gluing units 86 , 87 of the double gluing device are each designated by the same reference numerals. In addition to a particularly high throughput of the double gluing device, this has the advantage that the fibers are mixed well by the fiber streams 36 colliding head-on, without using mixing tools. Even for smaller throughputs, the double gluing device can be used as an alternative to the other gluing devices according to the invention, in order to achieve the very useful after-mixing.

FIG. 6 shows a gluing device which works on the principle of one of the gluing devices according to FIGS. 1 to 4, the special gluing means again not being shown. In addition to the gluing devices already described, the gluing device according to FIG. 6 has a fiber sifter unit 90 .

In the gluing device according to FIG. 6, the outlet opening 23 opens out of the chute section 22 in the exhaust hood 39 of the pneumatic means 13 Trans port. An inlet 91 of a coarse material discharge chute 92 is arranged opposite the outlet opening 23 . The coarse material discharge chute 92 extends in the vertical direction and has a coarse material discharge 93 at its lower end. Air supply openings 94 are arranged above the coarse material discharge 93 . Over the cross-section of the air control valve 92 Grobgutaustragsschachts 9 are attached b. Adjustment flaps 96 and 97 are arranged adjacent to the inlet 91 .

The fiber sifter unit 90 is based on the following mode of operation: The fibers of the fiber stream 36 emerging from the outlet opening 23 enter the suction hood 39 of the pneumatic transport device 13 . Light normalgut 98 , i.e. average heavy individual fibers, describe due to their relatively low kinetic energy after leaving the shaft section 22 a short throwing parabola, then from the transport air flow downwards indicated by the arrow 38 in the pneumatic transport device 13 to be taken away.

Coarse material 99 , which is heavier than the normal material 98 , describes a longer throwing parabola due to the higher kinetic energy and thus reaches the coarse material discharge chute 92 . Due to a low air flow prevailing in the coarse material discharge chute 92 , fiber particles which lie in the border area between light and heavy are removed from the coarse material discharge chute 92 into the air flow of the pneumatic transport device 13 . Heavy parts of the coarse material, however, fall in the coarse material discharge 93 . The adjustment flap 96 is adjustable in height and angle and is used to adjust the speed and direction of the downward air flow in the suction hood 39th In this way, the throwing parabola of the fiber stream 36 after exiting the shaft section 22 can be influenced. The air speed in the coarse material discharge shaft 92 is determined firstly by the strength of the negative pressure prevailing in the fiber sifter unit 90 , which in turn can be adjusted by the air throttle 35 in the upper channel section 40 of the pneumatic transport device 13 , and secondly by the air regulating flaps 95 . About the adjustable in height adjustable flap 97 , the opening cross section of the inlet 91 can be set.

With this gluing device it proves advantageous that gluing and Sifting of the fibers takes place in one and the same device.

FIG. 8 shows a gluing device which is composed essentially of a gluing device according to FIG. 1 and a gluing device according to FIG. 6 and thus has a first sub-unit 113 and a second sub-unit 114 . The gluing device is used for gluing dried fibers in two stages. It has a fiber dryer 115 , a tube 116 in which the fibers are dried is only partially shown. The tube 116 opens into a cyclone 117 , the contract from 1 is connected to the fiber cross-distribution device 2 . Exhaust air and water vapor are removed from the cyclone 117 via an outlet 118 .

The fan 12 of the pneumatic transport device 13 is connected on the output side to a transport line 119 which opens into a second cyclone 120 which is part of the second subunit 114 . The discharge 1 of the cyclone 120 is in turn connected to the fiber cross-distribution device 2 which opens into the dosing bunker 3 of the second subunit 114 . The fan 12 of the second subunit 114 is connected on the output side to a transport line 121 which leads to a molding machine, not shown. , The second subassembly 114 is indicated 114 is shown by the arrow 38 of the second partial unit of the molding machine, via a line 122 return air into the pneumatic Transporteinrich processing 13 performed. Return air is fed from the cyclone 120 into the pneumatic transport device 13 of the first subunit 113 via a further air line 123 . This is 70% of the discharged air from the cyclone 120, the remaining 30% of the air of the cyclone 120 of the cyclone 120 can be discharged as exhaust air through an outlet 124th Since the fan 12 of the first sub-unit 113 generates 100% transport air for the fibers, equalizing air is sucked in at a proportion of 30% through the air supply 11 of the first sub-unit 113 due to the negative pressure present. The same applies to the second sub-unit 114 , in which 70% return air is fed from the molding machine into the pneumatic transport device 13 and 30% compensating air is drawn in through the air supply due to the negative pressure in the sub-unit 114 .

The gluing device according to FIG. 8 is designed in such a way that with a desired proportion of solid resin of 10% based on atro fibers, 5% solid resin is allocated to the first gluing stage given by the first subunit 113 . From the first sub-unit 113 , the fibers are transported via the transport line 119 into the cyclone 120 and then pass into the dosing bunker 3 of the second sub-unit 114 , which, as in the case of the gluing device according to FIG. 6, is required to provide the fibers for the intended pro to be able to dose proportional addition of glue. The further features of the second subunit 114 are the same as in the device according to FIG. 6. Thus, different means for gluing the fibers can also be provided in the subunit 114 . The gluing stage given by the second subunit 114 is allocated a further 5% of solid resin.

The above-mentioned advantages are associated with this gradual gluing. This two-stage gluing is in comparison to the one-stage gluing with one of the gluing devices according to FIGS. 1 to 5 connected with only relatively little additional effort, since a sifting of the glued fibers is always necessary.

Claims (43)

1. A process for gluing dried fibers provided for the production of fiberboard, characterized by the following steps:

• a) The fibers ( 4 ) are fed from a metering device ( 3 ) through a feed shaft ( 10 ) pressurized with vacuum to a fiber roller ( 17 ) which is provided with a large number of pins ( 18 ) on its surface and rotates so
• b) that the fibers ( 14 ) are deflected by the pins ( 18 ), guided along a shaft section ( 22 ) delimited by a partial section ( 20 ) of the circumference of the fiber roller ( 17 ) and an opposite wall ( 21 ) and gluing means and by the pins ( 18 ) and an air flow generated by this are accelerated to approximately the peripheral speed of the fiber roller ( 17 ),
• c) wherein the fibers ( 36 ) move away from the fiber roller ( 17 ) due to the centrifugal force and lie against a section of the wall ( 21 ) without still coming into contact with the pins ( 18 ),
• d) the fibers ( 36 ) are glued in the area of the wall section or adjacent to one end of the wall section,
• e) and the fibers ( 36 ) emerge from an outlet opening ( 23 ) of the shaft section ( 22 ).

2. The method according to claim 1, characterized in that the wall section, against which the fibers ( 36 ) lie, begins about a quarter of the circumference of the fiber roller after the fibers ( 14 ) hit the fiber roller ( 17 ). 3. The method according to claim 1 or 2, characterized in that the fibers ( 36 ) are glued by means of glue slot nozzles ( 26 ). 4. The method according to claim 3, characterized in that the fibers ( 36 ) in the area of the glue slot nozzles ( 26 ) meet a gluing board ( 28 ). 5. The method according to claim 4, characterized in that the gluing board ( 28 ) has a surface which is provided with a profile, for example with a fin-like profile ( 101 ), a nail-like profile ( 106 ) or a stair-like profile ( 107 ). 6. The method according to claim 4 or 5, characterized in that the gluing board ( 28 ) is set at an angle to the direction of flow of the fibers ( 36 ) in order to deflect the fibers ( 36 ) in a predetermined manner and the pressure of the fibers ( 36 ) on the Specify glue board ( 28 ). 7. The method according to claim 3, characterized in that the fibers ( 36 ) in the region of the glue slot nozzles ( 26 ) tangentially meet a gluing roller ( 45 ) rotating in the direction of movement of the fibers ( 36 ). 8. The method according to claim 7, characterized in that the gluing roller ( 45 ) has a smooth upper surface. 9. The method according to claim 7, characterized in that the gluing roller has a surface which is provided with a profile, for example with a finnenarti gene profile ( 101 ), a nail-like profile ( 106 ) or a step-like profile ( 107 ). 10. The method according to any one of claims 7 to 9, characterized in that the gluing roller ( 45 ) is continuously cleaned with water by a rotating brush ( 48 ). 11. The method according to claim 10, characterized in that water used for cleaning one Glue processing system fed and used as glue preparation water becomes. 12. The method according to claim 1 or 2, characterized in that the fibers ( 36 ) are glued by means of a glue roller ( 60 ) which delimits the shaft section ( 22 ) with a partial region of a jacket surface ( 46 ) such that due to friction between the Fibers ( 36 ) and the jacket surface ( 46 ) glue from the jacket surface ( 46 ) on the fibers ( 36 ) is applied. 13. The method according to claim 12, characterized in that the outer surface ( 46 ) of the glue roller ( 60 ) is profiled, for example has radial grooves, axial grooves or depressions in the form of ball indentations ( 63 ). 14. The method according to claim 12 or 13, characterized in that by a glue application roller ( 64 ), which is arranged adjacent to the glue roller ( 60 ) and with which a glue pool ( 65 ) delimits, with counter-rotation of the rollers ( 60 , 65 ) a glue film is applied to the glue roller ( 60 ) through a gap ( 67 ) between them. 15. The method according to claim 12 or 13, characterized in that a glue film is applied to the glue roller ( 60 ) by immersion in a glue container ( 69 ). 16. The method according to any one of claims 12 to 15, characterized in that the addition of glue to the fibers ( 36 ) depending on the fiber throughput of a belt weigher ( 7 ) in the Do siereinrichtung ( 3 ) by changing the speed of the glue roller ( 60 ) is regulated. 17. The method according to any one of claims 12 to 16, characterized in that an accelerator is fed separately to the fibers ( 36 ) after the gluing. 18. Process for gluing dried fibers provided for the production of fiberboard, characterized by the following steps:

• a) The fibers ( 4 ) are fed from a metering device ( 3 ) through a feed chute ( 10 ) to a fiber roller ( 17 ) which is provided on its surface with a plurality of pins ( 18 ) and rotates in this way,
• b) the fibers ( 14 ) are deflected by the pins ( 18 ), guided along a shaft section ( 22 ) delimited by a partial section ( 20 ) of the circumference of the fiber roller ( 17 ) and an opposite wall ( 21 ) and by the pins ( 18 ) and an air flow generated by it is accelerated to approximately the peripheral speed of the fiber roller ( 17 ),
• c) the fibers ( 36 ) emerge at an outlet opening ( 23 ) of the shaft section ( 22 ) essentially in the horizontal direction of movement,
• d) the fibers ( 83 ) are suctioned down and thereby deflected, and
• e) the fibers ( 83 ) are glued in the deflection area by means of at least one spray nozzle ( 81 , 82 ) which ejects glue and air.

19. The method according to claim 18, characterized in that the fibers ( 83 ) are deflected into a channel ( 39 ) of a pneumatic transport device ( 13 ) and two rows of opposing spray nozzles ( 81 , 82 ) are provided, between which the fibers ( 83 ) can be redirected. 20. The method according to any one of the preceding claims, characterized in that the speed at which the fibers ( 14 ) meet the fiber roller ( 17 ) can be determined by adjusting the negative pressure prevailing in the feed shaft ( 10 ). 21. A method for gluing provided for the production of fiberboard NEN, dried fibers ( 4 ), characterized in that two symmetrically opposite lying arranged fiber streams ( 36 ) are provided, in which the fibers are glued in the same way according to one of the preceding methods the and the fiber streams ( 36 ) collide after exiting the outlet opening ( 23 ) of the shaft section ( 22 ). 22. The method according to any one of the preceding claims, characterized in that a screening of the fibers ( 98 , 99 ) immediately follows the gluing of the fibers ( 36 ). 23. The method according to any one of claims 1 to 21, characterized in that a method according to claim 22 closes. 24. Device for gluing dried fibers ( 4 ) provided for the production of fiberboard,
characterized in that below a discharge ( 6 )
that fibers ( 14 ) striking the fiber roller ( 17 ) are deflected by the pins ( 18 ),
along a shaft section ( 22 ) which is delimited by a partial section ( 20 ) of the circumference of the fiber roller ( 17 ) and an opposite wall ( 21 ) and which extends from an outlet opening ( 16 ) of the feed shaft ( 10 ) in the direction of rotation ( 19 ) the fiber roller ( 17 ) extends and is provided with an outlet opening ( 23 ) for the fibers ( 36 ),
and accelerated to approximately the peripheral speed of the fiber roller ( 17 ) by the pins ( 18 ) and an air flow generated thereby, the fibers ( 36 ) moving away from the fiber roller ( 17 ) due to the centrifugal force and against a portion of the wall lay without coming into contact with the pins ( 18 ),
and that the shaft section ( 22 ) is further delimited by means for gluing the fibers ( 36 ) arranged in the region of the wall section or adjacent to one end of the wall section. 25. The device according to claim 24, characterized in that the distance between the outer ends of the pins ( 18 ) and the wall ( 21 ) up to the outlet opening ( 23 ) increases pro gressively. 26. The device according to claim 24 or 25, characterized in that the fiber roller ( 17 ) is rotatable at such a speed that the wall section against which the fibers ( 36 ) lie, approximately after a quarter of the fiber roller circumference after the fibers ( 14 ) begins on the fiber roller ( 17 ). 27. Device according to one of claims 24 to 26, characterized in that the gluing means have glue slot nozzles ( 26 ) arranged over the width of the wall of the shaft section ( 22 ). 28. The apparatus according to claim 27, characterized in that the glue slot nozzles ( 26 ) are aligned tangentially to an adjacent gluing board ( 28 ). 29. The device according to claim 28, characterized in that the gluing board ( 28 ) has a surface which is provided with a profile, for example with a fin-like profile ( 101 ), a nail-like profile ( 106 ) or a stair-like profile ( 107 ). 30. Device according to claim 28 or 29, characterized in that the Beleimungsbrett (28) is adjustable at an angle to the direction of flow of the fibers (36), deflect the fibers (36) to different extents and thereby the pressure of the fibers (36) to be able to change the gluing board ( 28 ). 31. The device according to claim 27, characterized in that the glue slot nozzles ( 26 ) are aligned tangentially to an adjacent rotatable gluing roller ( 45 ). 32. Apparatus according to claim 31, characterized in that the gluing roller ( 45 ) has a smooth upper surface. 33. Device according to claim 31, characterized in that the gluing roller ( 45 ) has a surface which is provided with a profile, for example with a fin-like profile ( 101 ), a nail-like profile ( 106 ) or a stair-like profile ( 107 ). 34. Device according to one of claims 31 to 33, characterized in that the gluing roller ( 45 ) is in contact with a rotatable brush ( 48 ), which is partially immersed in a container ( 49 ) with cleaning water. 35. Device according to one of claims 31 to 34, characterized in that to the gluing roller (45) spray nozzles (50) of the gluing roller (45) that are disposed adjacent to the applying an accelerator to a jacket top surface (46). 36. Apparatus according to claim 24 to 26, characterized in that the gluing means comprise a glue roller ( 60 ) which delimits the shaft section ( 22 ) with a partial region of a jacket surface ( 62 ) in such a way that due to friction between the fibers ( 36 ) and the surface ( 62 ) of glue is applied to the fibers ( 36 ). 37. Apparatus according to claim 36, characterized in that the jacket surface ( 62 ) of the glue roller ( 60 ) is profiled, for example has radial grooves, axial grooves or depressions in the form of ball indentations ( 63 ). 38. Apparatus according to claim 36 or 37, characterized in that the glue roller ( 60 ) and a glue application roller ( 64 ) arranged adjacent to it limit such a glue pool ( 65 ) that when the rollers ( 60 , 64 ) rotate in opposite directions through a gap ( 67 ) between these a glue film can be applied to the glue roller ( 60 ). 39. Device for gluing dried fibers ( 4 ) provided for the production of fiberboard,
characterized in that below a discharge ( 6 ) of a fiber metering device ( 3 ) extends a feed shaft ( 10 ) which can be subjected to negative pressure from the discharge ( 6 ) to a fiber roller ( 17 ) which has a plurality of pins () on its surface 18 ) and is rotatable so
that fibers ( 14 ) striking the fiber roller ( 17 ) are deflected by the pins ( 18 ),
are guided along a shaft section ( 22 ) delimited by a partial section of the circumference of the fiber roll ( 17 ) and an opposite wall ( 21 ), said shaft section extending from an outlet opening ( 16 ) of the feed shaft ( 10 ) in the direction of rotation ( 19 ) of the fiber roll ( 17 ) extends and is provided with an outlet opening ( 23 ),
and accelerated by the pins ( 18 ) and an air flow generated thereby to approach the peripheral speed of the fiber roller ( 17 ),
that the fibers ( 36 ) are ejected through the outlet opening ( 23 ) essentially in the horizontal direction of movement,
that adjacent to the outlet opening ( 23 ) of the shaft section ( 22 ) an inlet opening of a pneumatic transport device ( 13 ) is arranged, into which the fibers ( 83 ) are deflected downward, and
that spray nozzles ( 81 , 82 ) are arranged in the deflection area, which are provided for gluing the fibers ( 83 ) by expelling glue and air. 40. Device according to claim 39, characterized in that two opposite rows of spray nozzles ( 81 , 82 ) are arranged at the inlet opening of the pneumatic transport device ( 13 ). 41. Device according to one of claims 24 to 40, characterized in that it comprises means for two symmetrically one on the other oppositely disposed flow (36) to beleimender fibers, wherein the fiber flows (36) exiting the exit opening (23) of the chute section ( 22 ) collide. 42. Device according to one of claims 24 to 41, characterized in that they have means for sifting the glued fibers having.   43. Device ( 113 ) according to one of claims 24 to 41, characterized in that a device ( 114 ) according to claim 42 is connected downstream of it.