WO1999010145A1

WO1999010145A1 - Method for producing wood-based panels

Info

Publication number: WO1999010145A1
Application number: PCT/EP1998/004843
Authority: WO
Inventors: Ingo Grebe; Bernhard Leibold
Original assignee: Babcock-Bsh Gmbh
Priority date: 1997-08-21
Filing date: 1998-08-04
Publication date: 1999-03-04
Also published as: DE19747930A1

Abstract

According to a well-known method, wood-based panels are made by coating with glue both sides of veneer strips which are disseminated in bulk and laid out in a direction substantially parallel to a special device, and finally loaded onto a support so as to form a thick particle mat to be pressed into a panel. The invention enables the steps of the mat building process to be improved, including by reducing the amount of refuse while still obtaining regularly cut veneer strips, by facilitating homogeneous glue application while garanteeing a parallel lay out as required to form the particle mat, without it being necessary to take additional steps. According to the invention, veneer plywood (27) is continuously supplied in the direction of fibers on a production line upstream from the mat forming process and, during the working cycle, parted into strips by cuttings performed in a direction parallel to that of said fibers; the strips are supplied non stop, coated with glue on both sides during that process and placed onto the emerging particle mat, while the parallel lay out of said strips remains virtually unchanged on the whole path up to their being laid onto the mat.

Description

Process and plant for the production of wood-based panels

The invention relates to a method according to the preamble of claim 1 and a system according to the preamble of claim 13

It connects to US Re 34 283. It describes a process in which narrow, thin strips of wood are glued, first scattered in a disordered manner, then aligned approximately parallel in a special device and finally placed on a continuously moving support so that they form a form a thick mat. This mat is fed to a continuous press and pressed into a plate. In one exemplary embodiment, veneer strips are used as wooden strips

The US-PS 4 706 799 also relates to the production of beam or plate-shaped objects made of wood material. It is particularly concerned with the formation of a mat by layering thin rods on a circumferential carrier belt. The rod, which is produced in a manner not described, parallel to Direction of movement of the carrier tape aligned and already glued are fed to the carrier tape by means of devices that are set up to the side of the carrier tape

Although various devices for the parallel alignment of elongated pieces of wood have been described in the literature (eg WO 95/01246 and WO 96/041 15), the inventor has known that the wooden parts have been placed by hand on the base on which the Mat is formed Mechanical processes work less satisfactorily, the more irregularly shaped pieces are contained in the amount of wooden parts. Irregularly shaped pieces also interfere with mat formation by impairing the homogeneous layering From practice it is known to produce veneer strips in such a way that continuously moving, practically endless tapes made of peeled veneer or format plates, for. B. with a rotary clipper transversely to the transport direction, ie parallel to the fiber direction, cuts into strips. However, this method encounters problems with the high speeds and the narrow strip widths of 10 to 20 mm which are required in the production of wood-based panels. It is difficult to get clean cuts because the veneer tends to shatter along the fiber. In the case of imperfections, which are particularly common with the peeling veneers commonly used, fragments of irregular length are produced. Splinters, fragments and the like interfere with the subsequent process steps and must be sorted out if possible. The waste rate is usually around 15%.

Systems are known in practice in which the veneer strips cut in the clipper fall directly from the clipper onto a conveyor belt. An exactly parallel alignment of the veneer strips perpendicular to the running direction of the conveyor belt is hardly technically feasible. The veneer strips, and in particular the fragments, fall onto the belt at a more or less irregular angular position. This creates overlaps so that veneer strips are partially covered by other strips. Therefore, they are only incompletely provided with glue during subsequent gluing.

The inventor has set itself the task, in a method according to the preamble of claim 1, to improve the process stages which precede the formation of the mat in such a way that veneers with regular cuts are produced with a reduced reject rate, so that even gluing is facilitated, and also the cut edges are glued and that the desired parallel alignment is ensured without additional measures. It is also part of the task to complete a system according to the preamble of claim 13 in such a way that it is suitable for carrying out the method according to the invention. The first part of the task is solved by the characterizing features of claim 1, the second part by the characterizing features of claim 13.

Further advantageous features of the invention are the subject of the dependent claims.

The drawing serves to explain the invention on the basis of exemplary embodiments shown in a highly simplified manner.

Figure 1 shows a line for the production and gluing of veneer strips according to the invention.

Figure 2 shows a grooved veneer panel in cross section.

Figure 3 shows a component of a modified embodiment.

Figure 4 shows a strip scissors in side view.

Figure 5 shows on a larger scale the cutting rollers of the strip shears, seen in the conveying direction.

Figure 6 shows a detail of the strip scissors in a section perpendicular to the axis of a cutting roller.

Figure 7 shows a scraper seen from above.

Figure 8 shows a conveyor unit.

Figure 9 shows a modified conveyor unit.

FIG. 10 shows a section of a top view of the front part of a group of veneer strips after they have passed through the conveyor unit according to FIG. have run.

Figure 1 1 shows a selective intermediate conveyor, seen against the direction of travel, with the cutting rollers as a background.

Figure 1 shows only part of a plant for the production of wood-based panels. It shows a road integrated into the overall system for the production and gluing of veneer strips up to the task of the glued veneer strips on a support designed as conveyor belt 1 for the formation of a thick mat.

The upstream road, integrated into the continuously operating system, has a conveyor system, which includes several conveyor units 2 to 5 arranged in series one behind the other. The direction of conveyance is symbolized by an arrow 6.

The conveyor unit 2 essentially consists of a continuous endless conveyor belt 7 and a plurality of corrugated pressure rollers 8 arranged above its upper run. A milling device 9 is arranged approximately at the end of the conveyor belt 7. The milling tool provided is a shaft which extends over the width of the conveyor belt 7 and is equipped with circular saw blades and which is mounted such that it can be adjusted in height in a machine frame (not shown) and is coupled to a drive. The circular saw blades sit on the shaft at regular intervals, which result from the width of the veneer strips to be produced. The distances are usually between 10 and 20 mm.

Between the conveyor unit 2 and the conveyor unit 3 there is a cutting device 10 with a cutting roller 11 and a counter roller 12. The cutting roller essentially consists of a shaft on which circular knives sit at regular intervals. The non-toothed, sharpened circular knives are arranged in exactly the same planes as the circular saw blades of the milling device 9. The cutting roller 11 is mounted with a fine adjustment in a machine frame, not shown, and is height-adjustable and provided with a drive. The Counter roller 12 has a coating of soft material, so that the circular knife * of the cutting roller 1 1 can dig.

The conveyor unit 3 has a continuous endless screen belt 13 as a supporting member. A plurality of pressure rollers 14 are arranged above it. In a space between two pressure rollers 14, a suction hood 15 is arranged, the mouth of which is located just above the upper run of the screen belt 13. The suction hood 15 is connected to a suction pipe 16.

A (conventional) clipper 17 follows behind (downstream) the conveyor unit 3. In the drawing, a knife roller 18 with two axially parallel, 180 ° offset knives is indicated, as well as a counter roller 19.

The conveyor unit 4 starts at a short distance behind the clipper 17. It is designed as a double belt conveyor with a carrying belt 20 and a cover belt 21.

Between the conveyor unit 4 and the conveyor unit 5 there is a gluing device 22. It has a lower applicator roller 23 and an upper applicator roller 24. The lower applicator roller 23 is immersed in a bath filled with liquid glue. The upper applicator roller 24 is assigned an auxiliary roller 25 which is in line contact with the upper applicator roller 24 along its entire length. The glue for the upper applicator roller 24 is continuously fed to the gusset between the two rollers 24 and 25.

Behind the gluing device 22 there is a feed belt as a conveyor unit 5. Its upper run, which forms the conveying surface, first passes through an approximately horizontal section and, after deflection by a deflecting roller 26, an inclined section which extends into the area in which the base 1 for forming the thick mat is located. The parts of the system which are still behind the base 1, in particular the press and possibly a sawing station, in which the plate is cut into bars, are not shown in the drawing.

The system according to FIG. 1 works as follows: Dried and cut to size veneer sheets 27, preferably made of peeled veneer, are placed on the conveyor belt 7 so that the direction of the fibers essentially corresponds to the direction of transport 6. The length of the panel 27, measured in the fiber direction, is z. B. 2 m. The width is adapted to the width of the conveyor units 2-5; for example, it is 0.5 m. The sheets are about 1 to 5 mm thick, preferably 2 to 4 mm. In the case of high quality requirements, error-free, precisely cut sheets are used. However, irregularly shaped panels can also be used, which, for. B. from the so-called "peelers" obtained at the beginning of the peeling process. The pressure rollers 8 ensure that the veneer panels 27 lying on the conveyor belt 7 maintain their alignment.

With the milling device 9, grooves 28 are milled into the continuous plate 27 parallel to the fiber direction. The depth of the groove 28 preferably corresponds to approximately 30 to 60% of the thickness. As Figure 2 shows, the groove 28 z. B. a V-shaped cross section.

The circular knives of the cutting device 10 then engage in the parallel grooves 28 in order to cut the remaining webs 29 without cutting by means of a wedge cut. Since the cut takes place in the area already weakened by the groove, the otherwise observed tendency of the veneers to splinter in the direction of the fiber when cutting is practically eliminated. The board is divided into a number of cleanly cut veneer strips, the width of which corresponds to the distance between the circular knives and the length of which corresponds to the length of the board 27.

The strips reach the conveyor unit 3 and are prevented from moving in the transverse direction by the pressure rollers 14 during further transport. Sawdust, splinters and smaller fragments are removed by a suction air stream via the cover 15 and the suction line 16. The maximum length of the extracted fragments can be varied by looking at the dimension of the mouth of the suction hood 15 measured in the transport direction 6 and / or the distance of the two pressure rollers 14, between which the suction hood 15 is arranged, - changed.

With the clipper 17, the strips are transversely to the fiber direction in lengths of z. B. 0.5 m divided. These are clamped in the conveyor unit 4 between the support belt 20 and the cover belt 21, so that they continue to maintain their transport direction according to arrow 6 and their parallel orientation.

They pass through the gluing station 22 in the form of an ordered single layer. This ensures that all strips on the top and on the bottom are glued evenly. The milled grooves facilitate the penetration of the liquid glue into the narrow spaces, so that the side cut edges are also wetted by glue.

On the feed belt of the conveyor unit 5, the glued strips are transported further without changing their relative position and finally thrown onto the base 1 without changing the direction of transport, more precisely: onto the mat, which is in steady operation on the base 1 in stationary operation.

The base 1 moves in the direction of transport 6 at a speed which is substantially lower than the speed of the road upstream according to the invention. In this way, a thick mat consisting of numerous layers is formed on the base 1, the transverse joints being offset longitudinally from layer to layer. In the simplest case, the width of the base 1 corresponds to the width of the conveyor units 2-5. However, it can also be wider than the conveyor units and the treatment stations of the upstream road, for example about twice as wide. In this case, it is moved periodically back and forth periodically, so that it is covered with veneer strips over its full width. The parallel movement slightly disrupts the parallel alignment of the veneer strips, so that there is an acute angle between the conveying direction and the longitudinal direction of the individual veneer strips. Such angular deviations of up to about 10 ° are desirable because they hold together the mat and the mat Improve the manufactured plate in the transverse direction without negatively affecting the formation of the mat. It is important that the ordered, parallel position of the strips remains essentially unchanged until they are transferred to the base 1.

The individual components of the road illustrated in FIG. 1 are within the framework of the prior art. On the basis of the description and drawing, the person skilled in the art is able to manufacture the components or to select from the range available on the market.

The expert is free to use the z. T. greatly simplified components to supplement or replace with other components with which the same effects and possibly additional effects can be achieved in a known manner.

If e.g. B. relatively thick veneers are used, it is recommended to provide both the top and the bottom with milled grooves. For this purpose, a milling device is required which has a second knife shaft arranged on the underside and equipped with circular saw blades.

In the cutting device 10, the counter roller 12 provided with a soft coating can also be replaced by a roller which has no coating and instead is provided with wedge-shaped, circumferential notches corresponding to the profile of the knife edges, into which the circular knives dip a little.

A modified embodiment of the conveyor unit 3 is illustrated in FIG. 3. The modified conveyor unit comprises two carrier tapes 30, 31 arranged one behind the other in the transport direction and two associated cover tapes 32, 33. There is a gap between the two carrier tapes 30, 31. At least one of the two carrier tapes 30, 31 is displaceable in the transport direction, as indicated by deflection rollers drawn with dashed lines. As a result, the size of the gap is variable. There is between the two cover bands 32, 33 also a free space. The open end of a blowpipe 34 projects into this space from above.

Veneer strips that run in the direction of arrow 6 and have the full length pass through the conveyor unit undisturbed. If, however, veneer strips are broken due to structural defects in the wood, fragments up to a length which corresponds approximately to the size of the gap between the two carrying bands 30, 31 fall through the gap into a waste container (not shown). Further fragments, splinters or the like are blown and thus also removed and rendered harmless.

The gluing device described in connection with the drawing can also be replaced by another device which is equipped with nozzles for spraying glue.

In a preferred embodiment of the invention, the cutting device provided with the reference number 10 in FIG. 1 is designed as a strip scissors 35 (FIG. 4). It is equipped with an upper and a lower cutting roller 36, 37. The two cutting rollers 36, 37 are driven in opposite directions at the same speed. Each of the two cutting rollers 36, 37 is provided with a plurality of circumferential grooves 38 arranged at uniform intervals, each of which is approximately 2 cm wide. There are annular webs 39 between the grooves 38. The webs of the upper cutting roller 36 are offset from the webs of the lower cutting roller 37 and engage a little in their grooves. Likewise, the webs 39 of the lower cutting roller 37 engage in the grooves of the upper cutting roller 36. The lateral play is very small, since the width of the webs is only slightly (ie only insofar as the tolerances due to mechanical engineering require) less than the width of the grooves 38. Each web 39 forms a double-edged tool. The cylindrical outer surface 40 is the pressure surface of the tool, the two edges 41 are the cutting edges, and the side surfaces 42 are the free surfaces. Each cutting edge 41 of the upper cutting roller 36 is assigned in the manner typical of scissors to a cutting edge of the lower cutting roller 37 which lies in a closely adjacent plane. Each groove 38 has a groove 43 in the bottom of the groove. Above and below the plane of symmetry between the two cutting rollers 36, 37, a wiper 44, 45 is attached to a holder 46. The scraper 44, 45 extends transversely to the conveying direction over the entire length of the cutting roller 36, 37 and extends in the conveying direction to the inlet nip of a downstream conveying unit 3 ^' , which is only indicated in FIG. 4 and which essentially corresponds to the conveying unit shown in FIG. 3 and also how this has an inlet-side carrier tape 30 ^' and an associated shroud 32 ^' . It is equipped in the manner of a comb with prongs 47 which project into the grooves 38 approximately tangentially with little lateral play. The ends of the tines 47 engaging in the grooves 38 are tapered in such a way that their side surface 48 facing the groove base is adapted to the cylindrical shape of the groove base and is closely adjacent to it. A rib-like, narrow extension 49 sits in the middle of it and protrudes into the groove 43 of the groove base and is also sharpened on the side facing the roller axis in accordance with the shape of the groove 43. This makes it possible to extend the extension 49 into the area of the narrowest point of the nip. The side 50 facing away from the roller axis - the underside in FIG. 6 - of the scraper 44 forms a smooth guide surface free of abutting edges over the entire length from the nip of the cutting rollers 36, 37 to the inlet nip of the subsequent conveyor unit.

A brush roller 51, 52 is provided above the cutting roller 36 and below the cutting roller 37, the bristles of which engage in the grooves 38 of the associated cutting roller 36, 37. Each brush roller 51, 52 is driven in the same direction as the cutting roller 36, 37 with which it is engaged, so that the peripheral speed of the brush roller 51, 52 in the contact area is opposite to the peripheral speed of the assigned cutting roller 36, 37.

The upper brush roller 51 is enclosed by a suction hood 53, from which a suction pipe 54 extends. Under the lower cutting roller 37 and the associated brush roller 52 there is a collecting funnel 55 to which a suction tube 56 is also connected. A conveyor unit 57 according to FIG. 8 or FIG. 9 is arranged in the part of the conveyor system which is located between the strip shears 35 and the subsequent gluing device. It can be connected upstream of the conveyor unit 4, which is illustrated in FIG. 1. However, it is preferably arranged directly in front of the gluing device; in this case it replaces the conveyor unit 4 of FIG. 1. It comprises an infeed conveyor belt 58, an outfeed conveyor belt 59 and a selective intermediate conveyor 60. Brush rollers 61, 62 are provided above the infeed conveyor belt 58 and the outfeed conveyor belt 59 and can be pressed onto the infeed conveyor belt 58 and the outfeed conveyor belt 59, respectively.

The intermediate conveyor 60 is equipped with a conveyor roller 63. Below this, a support table 64 is arranged in such a way that there is a narrow gap between conveyor roller 63 and support table 64. The table surface facing the conveyor roller 63 is smooth and low-friction.

The conveyor roller 63 has a roller core 65 on which several thin annular disks 66 are seated. The thickness of a pane 66 is smaller than the width of the continuous veneer strips 67, ie - if the division into strips with a strip scissors 35 according to FIGS. 4 and 5 - is smaller than the width of a web 39 of the cutting roller 36, 37 of the strip scissors 35. The narrow circumferential surface of the disk 66 is roughened or provided with a coating made of an egg material with a high coefficient of friction. The distance between two adjacent disks 66 (center to center) corresponds exactly to the distance between two webs 39 (also center to center) of a cutting roller 36, 37 of the strip scissors 35. Seen in the conveying direction, the center planes 68 of the disks 66 match exactly with the center planes of the webs 39 of one of the two cutting rollers, e.g. B. the lower cutting roller 37. This means that in the embodiment shown, the disks 66 are aligned with the grooves 43 of the upper cutting roller 36, as can be clearly seen in FIG. In general, a disk 66 is assigned to every second veneer strip, ie every second space between two cutting edges 41 of a cutting roller 36, 37. The feed roller 63 can be driven by means of a drive (not shown) at a speed * at which the peripheral speed of the disks 66 deviates from the feed speed of the inlet and outlet conveyor belts 58, 59,

In a modified embodiment of the selective intermediate conveyor, a cylindrical counter roller 69 is provided instead of the table 64, as illustrated in FIG. 9

In a system according to the invention, which is equipped with the components illustrated in FIG. 4 to FIG. 1 1, in operation, veneer panels 27 are fed to the strip shears 35 in the fiber direction by a conveyor unit, only indicated, to which reference number 2 ′ is assigned in FIG. 4. The veneer panels 27 can be provided at intervals that correspond to the width of the veneer strips to be produced, along with the cut lines provided with milled grooves. In particular, thin veneers (less than about 3 mm depending on the type of wood) can also be fed directly to the strip scissors 35 without the cross section along the length Cutting lines are reduced by preparatory processing In the strip scissors 35, the veneer panels 27 are divided into strips 67 in a continuous process. The strips 67, which - as illustrated in FIG. 2 - initially run alternately in two separate planes, are removed from the grooves by the scrapers 44, 45 38 of the cutting rollers 36, 37 excavated and - because of the tapered gap in the direction of travel between the upper and lower wipers 44, 45 - returned to a common plane before they reach a subsequent conveying unit 3 indicated in FIG. 4. The wipers 44, 45 also prevent fragments, For example, if the structure of the veneer is uneven, jam in the grooves 38 and be carried along by the cutting roller 36, 37. If there are still fragments or the like stuck in the grooves 38, these are removed by the brush rollers 51, 52 and over the suction channels 54, 56 discharged

An important advantage of shear cutting can be seen in the fact that - unlike wedge or bite cutting with thin, sharpened knife blades - the tools do not penetrate into the material, so that the strips are not squeezed between adjacent tools. It has been shown that the long edges of the strips have a rough, fibrous structure which is particularly suitable for the subsequent gluing

The veneer strips 67 reach the inlet conveyor belt 58 in full length, preferably without first being divided into sections by a cross cutter. They form a group whose outer contour corresponds exactly to the shape of the veneer panel from which the strips are made is rectangular, the leading edges and trailing edges of the strips lie on a line oriented transversely to the direction of conveyance.In this configuration, they are initially held by the brush rollers 61 until they reach the selective intermediate conveyor 60, where every second veneer strip is grasped by a disk 66 and with a The remaining veneer strips 67 maintain their speed and their position relative to each other. The selective intermediate conveyor 60 let them pass undisturbed. The brush rollers 61 62 cause their position relative to each other and to de Maintain inlet and outlet conveyor belt 58, 59 On the other hand, the brushes 61, 62 allow the veneer strips, which are gripped by the panes 66, to move longitudinally at a different speed, but without transverse movement and without the parallel orientation changing

Assume that the peripheral speed of the disks 66 is about 10% greater than the conveying speed of the inlet and outlet conveyor belts 58, 59. The veneer strips on which the disks 66 engage pass through during the period in which they are in contact with the disks 66, a 10% longer distance than the remaining veneer strips which pass freely through the spaces between the panes 66. In the case of veneer strips of 2 m in length, the distance difference is approximately 20 cm. After passing through the selective intermediate conveyor 60, the front edges and the rear edges are offset from one another, as illustrated in FIG. 7. In the offset configuration produced in this way, they are placed on the mat after gluing The advantage of this configuration is that the joints of the strips are offset in the wood-based panel even within the individual layers, so that there is no gap across the entire width. Rather, the interface has a toothed structure, which has a positive effect on strength and homogeneity.

Claims

claims

1. A process for the production of wood-based panels, in which a thick mat is continuously formed from glued veneer strips oriented approximately parallel, which is then pressed into a board,

characterized by the following upstream steps integrated into the continuous process:

Veneer panels are continuously conveyed in the direction of the fibers and divided into strips in the course of cuts running parallel to the direction of the fibers;

the strips are continuously conveyed, glued on both sides during the run and continuously placed on a mat under construction,

the parallel alignment of the strips remains essentially unchanged over the entire conveyor line until it is placed on the mat.

2. The method according to claim 1, characterized in that the veneer panels first at least on one side with parallel to the fiber direction

Grooves are provided and that the remaining webs are then cut open by wedge cutting.

3. The method according to claim 2, characterized in that the veneer panels are provided on both sides with grooves.

4. The method according to claim 1, characterized in that the veneer panels are divided by shear.

5. The method according to claim 4, characterized in that the veneer panels are cut by shearing without preparatory reduction of the cross section along the cutting lines.

6. The method according to any one of claims 1 to 5, characterized in that - waste particles, such as fragments, chips, splinters and dust, are removed from the strips by an air stream.

7. The method according to any one of claims 1 to 6, characterized in that veneer panels are used, the length of which is a multiple of the desired strip length, and that the strips are divided into several strip sections by cuts running transversely to the conveying direction.

8. The method according to any one of claims 1 to 6, characterized in that a plurality of strips maintain their relative position to each other during further transport and the remaining strips are shifted parallel to it in the longitudinal direction parallel and that the strips are placed on the mat in the grouping thus generated.

9. The method according to claim 8, characterized in that every second strip maintains its position.

10. The method according to claim 8 or 9, characterized in that several strips are conveyed at a constant speed and the remaining strips are conveyed at a different speed.

11. The method according to any one of claims 8 to 10, characterized in that the relative displacement is carried out immediately before the gluing.

12. The method according to any one of claims 8 to 1 1, characterized in that the strips are subjected in their full length to the relative displacement corresponding to the dimension of the veneer panel used.

13. Plant for the continuous production of wood-based panels, with a support continuously moving in the manner of a conveyor belt for * a thick mat made of veneer strips,

with devices for the continuous application of parallel-oriented glued veneer strips to the mat under construction

and with a press to which the mat formed on the pad is fed,

characterized by an upstream continuously working line for producing and gluing the veneer strips, at least the following

Components include:

a separating device (10, 35) for dividing veneer panels (27) into strips aligned parallel to the direction of passage,

a gluing device (22), which is equipped with organs for applying glue to the underside and to the top of the veneer strips,

a conveyor unit (2, 2 ^' ) for feeding the veneer panels (27) to the separating device (10, 35),

at least one conveyor unit (3, 3 ^' , 4) for the further transport of the veneer strips from the separating device (10, 35) to the gluing device (22) while maintaining their parallel orientation, and

at least one conveyor unit (5) for transferring the glued veneer strips to the conveyor belt (1) while maintaining their parallel alignment.

14. Plant according to claim 13, characterized in that for cutting the veneer panels (27) a cutting device (10) is provided which has at least one shaft on which several circular knives sit, and that the cutting device (10) is preceded by a milling device (9) which has at least one shaft on which a plurality of circular saw blades sit.

15. Plant according to claim 14, characterized in that the milling device (9) has two shafts equipped with circular saw blades, one of which is below and the other above the plane in which the veneer panels move.

16. Plant according to claim 13, characterized in that for cutting the veneer panels (27) a strip scissors (35) is provided with the following features:

it has two cooperating cutting rollers (36, 37);

each cutting roller (36, 37) is equipped with a plurality of tools (39) arranged at a distance;

each tool (39) has at least one circular cutting edge (41);

each cutting edge (41) of the one cutting roller (36) is assigned a cutting edge (41) of the other cutting roller (37) in a closely adjacent plane.

17. Plant according to claim 16, characterized in that the cutting roller (36, 37) is provided with a plurality of equally spaced circumferential grooves (38) and that between the grooves (38) are annular webs (39), the edges of which Cutting (41) are.

18. Plant according to claim 16 or 17, characterized in that above and below the plane of symmetry between the cutting rollers (36, 37) a wiper (44, 45) is arranged, which is equipped in the manner of a comb with prongs (47), which protrude approximately tangentially into the grooves (38).

19. Plant according to claim 18, characterized in that the groove (38) in the groove base has a groove (43) and that rib-like extensions (49) of the prongs (47) engage in the grooves (43).

20. Plant according to one of claims 16 to 19, characterized in that the cutting rollers (36, 37) brush rollers (51, 52) are assigned, the bristles of which engage in the grooves (38).

21. Plant according to one of claims 13 to 20, characterized in that a clipper (17) for dividing the veneer strips into at least two strip sections is arranged between the separating device (10, 35) and the gluing device (22).

22. Plant according to one of claims 13 to 20, characterized in that a conveyor unit (57) is arranged between the separating device (10, 35) and the gluing device (22), which has the following features:

a) an infeed conveyor belt (58) with at least one pressing device (61);

b) an outlet conveyor belt (59) with at least one pressing device (62);

c) a selective intermediate conveyor (60) arranged between the infeed conveyor belt (58) and the outfeed conveyor belt (59)

d) with a conveyor roller (63) which is equipped with a plurality of thin disks (66) and can be driven at a speed at which the peripheral speed of the disks (66) deviates from the conveying speed of the infeed and outfeed conveyor belts (58, 59), wherein a disc (66) is assigned to every second space between two cutting edges (41) of a cutting roller (36, 37) of the cutting device (35), and c2) with a support device (64, 69) which interacts with the conveyor roller (63 -) *.

23. Plant according to claim 22, characterized in that brush rollers (61, 62) are provided as pressing devices.

24. Plant according to claim 22 or 23, characterized in that a table (64) is provided as a support device.

25. Plant according to claim 22 or 23, characterized in that a roller (69) is provided as a support device.

26. Plant according to one of claims 13 to 25, characterized in that a conveyor unit (3) arranged between the separating device (10, 35) and the gluing device (22) has a circumferential endless carrier belt (13) that over the carrier belt (13 ) at least two auxiliary conveying elements (pressure rollers 14) are provided for pressing the goods against the carrying belt (13) and that a suction hood (15) is arranged in the space between two adjacent auxiliary conveying elements (pressure rollers 14).

27. Plant according to one of claims 13 to 25, characterized in that one between the separating device (10, 35) and the gluing device (22) arranged conveyor unit (3) has two successive circumferential support belts (30, 31) that over each Carrier belt (30, 31) at least one auxiliary conveyor element (cover belt 32, 33) is provided for pressing the goods against the associated carrier belt (30, 31) such that there is a gap between the two conveyor belts (30, 31) that there is a gap between the auxiliary conveyor element ( The cover band 32) of the one support band (30) and the auxiliary conveyor (cover band 33) of the other support band (31) have a free space and that a blow pipe (34) projects into this free space from above.

28. Plant according to one of claims 13 to 27, characterized in that the conveyor unit (4), which is arranged directly in front of the gluing device (22), has a carrier tape (20) and a cover tape (21).

29. Plant according to one of claims 13 to 28, characterized in that the gluing device (22) has a lower and an upper applicator roller (23, 24).

30. Plant according to one of claims 13 to 29, characterized by a behind the gluing device (22), designed as a feed wall

Conveyor unit (5) for the continuous feeding of the glued veneer strips onto the base (1).

31. Plant according to one of claims 13 to 30, characterized in that the transport direction remains unchanged along the entire upstream road and corresponds to the transport direction of the conveyor belt (1).