WO2001059311A1

WO2001059311A1 - Method for joining multi-layered sheets

Info

Publication number: WO2001059311A1
Application number: PCT/EP2001/001191
Authority: WO
Inventors: Claus Reissig
Original assignee: Claus Reissig
Priority date: 2000-02-09
Filing date: 2001-02-05
Publication date: 2001-08-16
Also published as: DE10005737C2; DE10005737A1; AU2001230242A1

Abstract

The invention relates to a method for the gluing of multi-layered sheets, in the production of lightweight constructions, for example, in chassis manufacture or in furniture construction. Caravans and motorhomes are constructed using multi-layered sheets joined at the abutting edge by means of so-called corner connectors. Said corner connectors are heavy, expensive to produce, time-consuming to install and subject to fatigue through the typical loading of caravans and motorhomes. Furthermore the core layers of the multi-layered sheets are not connected to each other. According to the invention, the novel method makes corner connectors superfluous and connects multi-layered sheets, easily, durably stable, wind- and water-tight and free from fatigue. The traditional mounting of furniture and separating walls in caravans and motorhomes causes fatigue and is extremely costly. Even here the novel method permits a durably stable, rational, neat and easy construction. The multi-layered plates are joined on the abutting edges by a glued joint made from resin. A long glue joint is created by overlapping the outer layers. Recesses in the core layer region permit the glued joint to function as a spacer and thus generate a stable frame, which makes the multi-layered sheet stable to pressure in this region. The gluing method can be used for the production of varying constructions and furniture, as a result of the multiple applications thereof, without any dependence on corner connectors. Various types of joints may be used to produce corner, longitudinal and abutting joints.

Description

Method of connecting

Multilayer boards

Description:

The invention relates to a method for connecting multilayer boards that meet with edges and in which at least one core layer that is flexible under pressure is covered on both sides by pressure-resistant cover boards.

In addition, the invention relates to a connection of multi-layer plates abutting one another with edges, which consist of at least one core layer which yields to pressure and two cover plates which cover the core layer on both sides and which are resistant to pressure.

Such connections are preferably used in furniture construction or in the manufacture of lightweight structures, for example in body construction. In particular, there are applications in which, for example, motorhomes or caravans are to be manufactured. On the one hand, these constructions should be light, if possible also heat-insulating, in particular, however, stable and resistant to use.

For this purpose, corner connections in particular have become known, which are used in the construction of caravans and caravans. For this purpose, it was proposed to connect two multilayer panels running at right angles to one another by means of an aluminum profile which essentially consists of a 90 ° bend on which guides can be provided on both sides for receiving the panels to be connected. Such profiles therefore often consist of plug connections, which have the disadvantage that the plates guided in them can perform movements. This will loosen the plug connections over time so that they are no longer moisture and heat tight. In addition, such corner connections make the overall construction considerably more expensive and increase its weight.

The object of the present invention is therefore to improve the method of the type mentioned in the introduction in such a way that a torsionally rigid connection of the plates to be connected to one another is achieved. This object is achieved in that an adhesive seam is produced with which the core layer of a first multilayer plate is connected to a second multilayer plate and with which cover plates delimiting the core layer are kept at a predetermined distance from the core layer.

In this way, the multilayer boards are permanently connected to each other in a stable and torsion-resistant manner. The spatial structures created with the help of this technology, for example furniture constructions or boxes for caravans, caravans or caravan trailers, are given a minimal weight because special corner connectors are not used. The connection is absolutely watertight and creates a self-supporting structure that represents a stable unit. The individual components of this construction, i.e. the multi-layer panels are connected to each other elastically, but without movements of the individual parts against each other could arise. This prevents moisture-conducting joints and creates a construction that is absolutely maintenance-free.

When connecting the type mentioned in the introduction, complex and expensive corner connectors are also used, which are manufactured with great effort and are therefore expensive. The corner connectors also have the disadvantage that they can only be used for certain panel thicknesses. In order to be able to process plates, some of which have different thicknesses, a correspondingly large number of connectors must be available. This makes expensive warehousing necessary. If the corner connectors are used improperly, there is a fear that a very high pressure will be applied to the edges of the panels to be joined, which will result in the panels being pressed together in the area of the corner connectors, so that they are no longer windproof and moistureproof in the protrude corresponding guides of the connecting elements. In addition, there is no connection in the area of the core layer, so that only a low strength is achieved with composite panels.

Another object of the present invention is therefore to improve the connection of the type mentioned in the introduction in such a way that the multilayer boards are connected to one another in a shape-retaining manner. This The object is achieved according to the invention in that the multilayer plates are connected to one another by an adhesive seam on which the sealing plates are supported at a distance of the thickness specified by the core layer.

This double function of the adhesive seam, namely on the one hand to bring about a connection between the multilayer panels to be connected and on the other hand to form a spacing gauge which prevents the multilayer panels from being compressed, creates a watertight and air-tight connection of the panels. The dimensional accuracy of the edges to be joined together leads to the creation of a high precision corner connection which can be worked well, so that a shapely and very durable structure is created by machining the corners.

According to a further preferred embodiment of the invention, the core layer of the first multilayer plate is glued to the core layer of the second core layer plate. In this way it is achieved that the two multilayer boards to be connected maintain the desired dimensional stability, so that they not only have the desired external appearance, but also represent a stable and dimensionally stable connection. Even an external pressure to be applied to the plates cannot impair the dimensional accuracy of the plates. The desired pressure can therefore be applied to the plates.

According to a further preferred embodiment of the invention, the core layer of the first multilayer plate is bonded to at least one cover plate of the second multilayer plate. In this way, large-area adhesive bonds can be made, which ensure high stability. Even in the case of movable constructions, which are often subjected to considerable loads, especially when cornering and on poor paths, the connections remain dimensionally stable and tight against moisture and wind.

According to a further preferred embodiment of the invention, the core layer of the first multilayer plate is glued to the inner sides of the two cover plates of the second multilayer plate facing the core layer. This creates an adhesive sewn, which meets the high elasticity requirements that exist in the construction of caravans and is nevertheless torsionally rigid. In addition, this connection is comparatively cheap and very aging-resistant compared to the known corner connectors.

According to a further preferred embodiment of the invention, at least one cover plate of the first multilayer plate is joined to the corresponding cover plate of the second multilayer plate, which is filled with adhesive, in the area of the adhesive seam. In this way it is achieved that a permanent connection between the cover plates is also achieved in the area of the joint. The adhesive also provides an elastic connection between the two cover plates to be connected to one another, which is able to take considerable loads into account.

According to a further preferred embodiment of the invention, the core layer is provided with a recess which receives the adhesive. This recess enlarges the areas on which the adhesive sticks. In addition, such recesses also enlarge the areas on which the cover plates can be supported, so that they cannot deform in relation to one another under the influence of forces occurring at right angles to the plate surface. Rather, the multilayer board retains its shape even when relatively large forces are applied. The heat-insulating and stabilizing core layer is not compressed, so that it maintains its favorable insulation factor.

According to a further preferred embodiment of the invention, at least one of the two interconnected multilayer panels is provided with rounded edges in the region of the adhesive seam. This possibility of rounding off the edges emphasizes the construction according to the invention compared to all previously known constructions, since even after rounding off the edges, sufficiently large areas remain on which the opposing cover plates can be supported. As a result, the construction resulting from the connection of the multilayer panels maintains the desired shape and strength against wind and seeping moisture. According to a further preferred embodiment of the invention, in the case of a connection of multilayer plates abutting one another with edges, the adhesive seam lies between the core layer of a first multilayer plate and an inside of at least one of the cover plates facing the core layer. This shows the support function of the adhesive seam particularly clearly. It reinforces the multilayer board at its most sensitive point, where the cover plates deform when applied with suitable pressure in the direction of the core layer and thereby impair its dimensional accuracy. Such a deformation of the cover plates is excluded by the supporting effect of the adhesive seam.

According to a further preferred embodiment of the invention, the adhesive seam projects through a butt joint of mutually adjacent cover plates onto an outer surface of the cover plate facing away from the core layer and is glued to it there. This enables the cover plates to be guided on both sides, on the inside thereof facing the core layer and on the outside running parallel to it. As a result, the cover plates are guided securely without being able to escape elastic deformation.

According to a further preferred embodiment of the invention, the butt joint extending in the longitudinal direction over the length of a plate is designed as a straight line. As a result, the butt joint can be produced mechanically relatively cheaply and also has the necessary strength.

According to a further preferred embodiment of the invention, the butt joint runs in the form of a zigzag line. The production of such a butt joint is considerably more expensive than the straight butt joint. However, the butt joint, which is designed as a zigzag, enables even greater forces to be transmitted than when using a straight joint.

According to a further preferred embodiment of the invention, the recess has a rectangular cross section. This considerably simplifies the production of the joint. The forces that can be transferred from the bonded seam in this joint are sufficient According to a preferred embodiment of the invention, the recess has a trapezoidal cross section. This can be produced cheaply and will be used in particular when the forces occur in a certain direction with a decreasing tendency, so that a sufficiently good bond occurs even with small amounts of the adhesive used.

According to a further preferred embodiment of the invention, the cover plates to be connected abut one another in the region of the core layers to be connected. This creates an adhesive seam that runs in one plane and is therefore particularly quick and cheap to produce. However, the cover plates are only supported on a relatively small area. According to a further preferred embodiment of the invention, at least one of the multilayer panels to be connected protrudes with one of its cover panels beyond the area of the core layers to be joined together. As a result, the adhesive seam extends to the protruding part of the cover plate and the core layers to be connected to one another. This large adhesive seam is suitable to meet high durability requirements.

According to a further preferred embodiment of the invention, the core layer is formed from a foam. This foam fulfills high requirements for heat and sound insulation. On the other hand, the foam is not very resistant to forces applied perpendicular to the surface of the panel. For this reason, the adhesive seam designed as a support has proven itself particularly in the case of a core layer consisting of foam.

Further details of the invention ^" will become apparent from the following detailed description and the accompanying drawings, in which preferred embodiments of the invention are illustrated, for example.

The drawings show:

FIG. 1 shows a longitudinal section through a connection point of two multilayer plates aligned in the vertical direction, Figure 2: a longitudinal section through a connection of two mutually perpendicular

Multi-layer panels, Figure 3: a cross section through another connection of two perpendicular to each other

Multi-layer panels, Figure: a longitudinal section through another connection of a extending in a vertical direction and a curved multi-layer panel, Figure 5: a plan view of a side surface in

Direction A in FIG. 1, FIG. 6: another plan view in direction A in FIG. 1 and FIG. 7: a longitudinal section through a connection point of two multi-layer panels, one of which the one side with its own

Cover plate protrudes.

A connection (1) essentially consists of a first multilayer plate (2) and a second multilayer plate (3), which are connected to one another via an adhesive seam (4). The adhesive seam (4) runs essentially perpendicular to a plane spanned by the multilayer panels (2, 3). It has partial surfaces (5, 6) which extend in the plane of the multilayer plates (2, 3) and are connected to a supporting part (7) which extends transversely to the surface of the multilayer plates (2, 3).

The multilayer plates (2, 3) essentially consist of a core layer (8) which is flexible under pressure and which are covered on both sides by pressure-resistant cover plates (9, 10). The core layer (8) is designed, for example, as a closed-pore hard foam which gives the multilayer board (2, 3) a high thermal insulation value and great strength. In contrast, the cover plates (9, 10) are made, for example, of polyvinyl chloride (PVC), aluminum or a hard laminate, e.g. made of wood.

The partial areas (5, 6) extend on one of the core layers are firmly glued to it. A partial surface (5) can extend along a support part (12) which projects beyond the support part (7) and is provided on the cover plate (10) of one of the two multilayer plates (3) to be connected, while the partial surface (6) a support part (13) is attached, which is provided on the cover plate (9) of the first multilayer plate (2) to be connected to the second multilayer plate (3). In this way, the partial areas (5, 6) lie on the adhesive seam (4) over a large area on the inner surfaces (11) of the cover plates (9, 10), so that the entire adhesive seam (4) forms a firm connection between the two multilayer plates (2, 3) represents the high demands on watertightness and flexibility.

The support part (7) of the adhesive seam (4) has a cross-section which is large enough to support the two cover plates (9, 10) with respect to shape in such a way that, even when considerable pressure is exerted, they act on the cover plates (9, 10) is applied, do not deform them in such a way that they press the core layer (8) together and thus impair its thermal insulation value and strength. Rather, the multilayer panels (2, 3) retain their original cross-section in the area of the adhesive seam (4).

The cover plates (9, 10) of the multilayer plates (2, 3) to be connected to one another generally lie directly against one another with their joints (14, 15). However, it is also possible to provide a distance (16) between the joints (14, 15), which is provided for receiving the adhesive. In this case, the excess adhesive applied to the partial surfaces (5, 6) squeezes the spacing (16) and leads there to a bond between the joints (14, 15).

However, it is also possible for the adhesive to emerge in the region of the distance (16) in the direction of an outer surface (17) of the cover plates (9, 10) running parallel to the inner surface. In this case, the outer surface (17) is included in the adhesive seam (4), so that particularly careful gluing takes place in the area of the joints (14, 15). This creates adhesive spots (18) on the outer surface (17), which lead to particularly careful bonding of the joints (14, 15). After this glue has hardened these glue points (14, 15) can be sanded and then reworked with a spatula and / or with a paint. Instead of providing the adhesive seam (4) with the partial surfaces (5, 6), joints (19, 20) of the cover plates (9, 10) can also be provided in the area of the support part (7). In this case, a cross-section of the support part (7) appears to be of particular importance, which is large enough to ensure that the cover plates (9, 10) can be supported against one another sufficiently securely in the region of the joints (19, 20). In this case too, a distance (21) can be provided between the joints (19, 20), through which the adhesive forming the adhesive seam can pass to the respective outer surface (17) of the cover plates (9, 10).

Appropriate preparation of the multilayer panels (2, 3) to be joined together is necessary to introduce the adhesive seam (4). Thus, the two multilayer panels (2, 3) are provided at their ends (22, 23) to be glued together with a recess (24) into which the adhesive provided to form the adhesive seam is filled. This recess (24) must be large enough so that the adhesive hardening in the recess (24) can form the support part (7). On the other hand, the recess (24) can also have a design which is matched to the core layer (8) and is suitable for introducing the forces occurring in the support part (7) into the core layer (8) over the largest possible area. In this sense, the recess (24) can have a rectangular cross section (25) or a triangular cross section (26) (FIG. 2), depending on the production. A base line (27) of the triangular cross section (26) is provided with a wide base (28) so that the cover plates (9, 10) can be mutually supported in the area of this base (28).

Opposite the base (28) is a tip (29) of the triangular cross section (26), to which two triangular sides (30, 31) extend. These distribute the forces to be transmitted from the support parts (7) over a relatively large area.

However, it is also possible to provide the support part (7) with a triangular cross section (26) in such a way that the adhesive layer is thickest in the region of the higher load on this support part (7). For example, with a corner connection (32) to be expected that considerable forces are exerted on an intermediate floor (33) or a wall which is designed as a multilayer board (2) by objects, not shown, which are set up or introduced onto one of the cover boards (9) , These forces must be introduced into a wall (34), which is formed by a multilayer plate (3) and extends in a vertical plane. For this purpose, support parts (7) of adhesive seams (4) are produced in the area of a part (35) of the intermediate floor (33) or wall protruding into the wall (34), the adhesive seam (4) of which has a triangular cross section (26) has the thickest part at an end (36) projecting into the vertical wall (34). In addition, this type of adhesive seam is also inexpensive to manufacture. If bending moments are therefore introduced into the intermediate floor (33), these are taken up by the thickest end of the adhesive seam (4) and introduced into the vertical wall (34).

Compared to conventional connections, the connection has the decisive advantage, among other things, that it can be subjected to processing even after it has been created. For example, corners (37) can be rounded off after the adhesive has hardened. This rounding (37) only has to take into account that the abutment (7) is not impaired in its ability to absorb occurring pressure forces. However, since the rounding of the corners (37) only takes place after the adhesive has hardened sufficiently, the connection is relieved of pressure before the rounding (37) of a corner is carried out. In this state, the connection is so largely stable against deformation that the forces occurring in the entire area of the support part (7) can be transmitted to the core layer (8) and the cover plates (9, 10).

In addition, however, a rounded connection of two multilayer plates (2, 3) arranged in mutually perpendicular planes can also be made using a curved multilayer plate (38) (FIG. 4). This"? curved multilayer board (38) has ends (39, 40) which are arranged in planes which are perpendicular to one another. In this way, one of the two ends (39) in a horizontally extending multilayer board (41) and the other end (40) in a vertically extending Open the multilayer board (42). As already shown, the ends (39, 40) are connected with adhesive seams (4), each of which consists of a support part (7) and two partial surfaces (5, 6). With the aid of such curved multilayer boards (38), a large number of corner designs are possible.

The distance (16, Fig. 5)) can be guided along an outer surface (17) in various ways. For example, this distance (16) can extend in the form of a straight line (43) through an outer surface (17). However, it is also conceivable to design the distance (16) in the form of a zigzag line (44). In this case, the gluing points (18) to be connected with the glue passing through the spacing (16) are considerably larger than when the gluing point (18) is straight. As a result, the parts of the cover plates (9, 10) to be connected by the adhesive are also better arrested. This makes the connection particularly stable against deformation.

To produce a connection (1), the multilayer plates (2, 3) are first cut to the desired size. Subsequently - for example with a drawing iron - the recess (24) is produced with a cross section that is determined to be particularly favorable for the respective application. In the case of a connection (1) between two multilayer plates (2, 3) running in the vertical direction, the production of a recess (24) with a rectangular cross section (25) will generally suffice.

If the multilayer plates (2, 3) butt in the area of their ends (22, 23) over their entire cross section, it is sufficient to produce a corresponding recess (24). However, connection (1) should also be in the area of the partial areas

(5, 6) If the ends (22, 23) of the multilayer panels (2, 3) have to be prepared so that these partial areas (5, 6) between the cover panels (9, 10) and the core layer (8) involved Find space. For this purpose the recess

(24) at the end of a support part (12) of the cover plate (10) protruding from the recess (24) on one side. The multilayer plate (2) to be connected to the multilayer plate (3) is processed in the region of the carrier part (12) projecting beyond the multilayer plate (2) in such a way that the ^» (10) from the multilayer plate (2) and beyond from the core layer (8) a gap (5) receiving the gap is lifted. The cover plate is shortened so that it forms a distance (16) with the carrier part (12) of the multilayer plate (3), through which part of the adhesive applied to produce the partial surface (5) forms on the outer surface (17). can press through.

A similar procedure is used to prepare the adhesive seam (4) with the cover plate (9) of the multilayer plates (2, 3), with the only difference that the cover plate (9) of the multilayer plate (2) via the recess (24) in the direction protrudes onto the multilayer board (3). To accommodate this carrier part (13) and the adhesive filling the partial surface (6), the cover plate (9) of the multilayer plate (3) and at the same time a part of the core layer plate (4) that is required to hold the required adhesive is lifted off. In addition, an adhesive seam (7) with a cover plate (9) projecting on one side can also be produced.

The adhesive is then introduced into the recess (24) and applied to the preparatory partial surfaces (5, 6) of the multilayer panels (2, 3). A two-component adhesive, for example an epoxy resin, is preferably used, which is thickened to a pasty mass with the addition of fillers. This mass hardens and connects the elements firmly and permanently. The surfaces to be bonded are expediently soaked with non-thickened resin before the adhesive is applied. These soaked areas are a good basis for absorbing the thickened mass.

After the adhesive has been applied, the multilayer panels (2, 3) to be joined are joined together in such a way that the surfaces prepared in each case act on one another. Subsequently, a pressure required for gluing is exerted on the connection point produced in this way, for example by clamping in a planing bench, screw clamp or with the help of Spanish winches. This is to be understood as a rope spanning the components, in which a pull is generated with the aid of a toggle, which pressurizes the spanned components. After the adhesive has set, the adhesive points have a strength suitable for further processing. You can now a further processing are subjected, for example, _from grinding of edges that are rounded in this way.

Claims

Claims:

1. A method for connecting multilayer boards that meet with edges and in which at least one core layer yielding to pressure is covered on both sides by pressure-resistant cover plates, characterized in that an adhesive seam (4) is produced with which the core layer (8) of a first multilayer board (2) is connected to a second multilayer plate (3) and with which the cover plates (9, 10) delimiting the core layer (8) are kept at a distance predetermined by the core layer (8).

2. The method according to claim 1, characterized in that the core layer (8) of the first multilayer board (2) with the core layer (8) of the second core layer board (3) is glued.

3. The method according to claim 1 or 2, characterized in that the core layer (8) of the first multilayer plate (2) with at least one cover plate (9, 10) of the second multilayer plate (3) is glued.

4. The method according to any one of claims 1 to 3, characterized in that the core layer (8) of the first multilayer plate (2) with an inner surface (11) facing the core layer (8) of the cover plate (9, 10) of the second multilayer plate (3rd ) is glued.

5. The method according to any one of claims 1 to 4, characterized in that the core layer (8) of the first multilayer plate (2) with the core layer (8) facing inner surfaces (11) of the two cover plates (9, 10) of the second multilayer plate ( 3) is glued.

6. The method according to any one of claims 1 to 5, characterized in that the core layer (8) of the first multilayer plate (2) with one of the core layer (8) modified outer surface (17) at least one cover plate (9, 10) of the second multilayer plate (3) is glued.

7. The method according to any one of claims 1 to 6, characterized in that the core layer ⁽ 8) of the first multilayer plate (2) with an outer surface (17) facing away from the core layer (8) at least one of the cover plates (9, 10) of the first multilayer plate (3) is glued.

8. The method according to any one of claims 1 to 7, characterized in that in the region of the adhesive seam (4) at least one cover plate (9, 10) of the first multilayer plate (2) for the corresponding cover plate (10, 9 ^{) of} the second multilayer plate (3) at a distance

(21) is added, which is filled with glue.

9. The method according to claim 8, characterized in that by the distance (16, 21) on the outer surface (17) at least one of the cover plates to be connected (9, 10) emerging adhesive is pressed with the outer surface (17).

10. The method according to any one of claims 1 to 9, characterized in that the core layer (8) is provided with a recess receiving the adhesive (24).

11. The method according to claim 10, characterized in that the recess (24) is brought up to the inner surface (11) of at least one cover plate (9, 10) on which a support surface on the adhesive seam (4) is formed.

12. The method according to claim 10 or 11, characterized in that the recess (24) with a cutting tool m the core layer (8) is cut into it.

13. The method according to any one of claims 10 to 12, characterized in that at least one of the two cover plates (9, 10) of a first multilayer plate (2) over the recess (24) in the direction of the second multilayer plate (3) is guided protruding.

14. The method according to any one of claims 1 to 13, characterized in that at least one of the two interconnected multilayer panels (2, 3) in the region of the adhesive seam (4) with a

15. Connection of multi-layer plates abutting one another with edges, which consist of at least one core layer which yields to pressure and two cover plates which cover the core layer on both sides and are resistant to pressure, characterized in that the multi-layer plates (2, 3) by an adhesive seam (4) are interconnected, on which the cover plates (9, 10) are supported at a distance of the thickness specified by the core layer (8).

16. Connection according to claim 15, characterized in that the core layers (8) of at least two multilayer plates (2, 3) to be connected to one another are connected to one another.

17. A compound according to claim 15 or 16, characterized in that the core layer (8) of a first multilayer plate (2) with at least one cover plate (9, 10), a second multilayer plate (3) is glued.

18. Connection according to one of claims 15 to 17, characterized in that the adhesive seam (4) between the core layer (8) of a first multilayer plate (2) and one of the core layer (8) facing inner surface (11) of at least one of the cover plates (9 .

10) lies.

19. Connection according to one of claims 15 to 18, characterized in that the adhesive seam (4) by a distance (21) adjacent cover plates (9, 10) on an outer surface (17) facing away from the core layer (8) of the cover plate (9 , 10) protrudes and is glued to it.

20. Connection according to claim 19, characterized in that the distance (21) is formed as a straight line (43) extending over the outer surface (17).

21. A connection according to claim 19, characterized in that the distance (21) in the form of a zigzag line (44) extends over the outer surface (17).

22. Connection according to one of claims 15 to 21, characterized in that the adhesive seam (4) extends in a recess (24) which extends through the core layer (8) of at least one of two multilayer panels (2, 3) to be connected to one another ,

23. Connection according to claim 22, characterized in that the recess (24) has an at least partially rounded cross section.

24. The connection according to claim 22, characterized in that the recess (24) has a cross section with a plurality of corners.

25. Connection according to claim 24, characterized in that the recess (24) has a rectangular cross section (25).

26. The connection according to claim 24, characterized in that the recess (24) has a trapezoidal cross section.

27. The connection according to claim 24, characterized in that the recess (24) has a triangular cross section (26).

28. Connection according to one of claims 1 to 27, characterized in that the adhesive seam (4) abuts with bearing surfaces on the inner surfaces (11) of the cover plates (9, 10).

29. Connection according to one of claims 18 to 28, characterized in that the cover plate (9, 10) is roughened on its surface to be glued with the adhesive seam (4).

30. A compound according to claim 29, characterized in that the surface to be glued is roughly ground.

31. Connection according to one of claims 15 to 28, characterized in that the cover plates to be connected (9, 10) abut one another in the region of the core layers (8) to be connected.

32. Connection according to one of claims 15 to 30, characterized in that at least one of the multilayer board to be connected ten (2, 3) with one of its cover plates (9, 10) protrudes beyond the area of the core layers (8) to be joined together.

33. Connection according to one of claims 15 to 32, characterized in that the adhesive is designed as a resin.

34. Connection according to claim 33, characterized in that the adhesive is designed as an epoxy resin.

35. Connection according to one of claims 15 to 34, characterized in that the core layer (8) consists of a foam.

36. Connection according to claim 35, characterized in that the foam is formed as a rigid foam.

37. Connection according to one of claims 15 to 36, characterized in that the cover plate (9, 10) consists of aluminum.

38. Connection according to one of claims 15 to 36, characterized in that the cover plate (9, 10) consists of PVC (polyvinyl chloride).

39. Connection according to one of claims 15 to 36, characterized in that the cover plate (9, 10) consists of a layer material.

40. Connection according to one of claims 15 to 36. characterized in that the cover plate (9. 10) consists of glass fiber reinforced plastic.

41. Connection according to one of claims 15 to 38. characterized in that the core layer (8) consists of laminate.

42. Connection according to one of claims 15 to 38. characterized in that the core layer (8) consists of glass fiber reinforced plastic.