FI111822B - Panel consisting of tabs - Google Patents

Description

111822

Plywood Panel - Panel bestäende av faner

The invention relates to a process for the production of plywood panels having irregular elevations and valleys and a plywood panel having irregular elevations and valleys.

GB-2 260 935 describes a method for making vessels of irregular shape. First, it uses a mold of the desired shape of the container made of a plastic material to be molded. Several, but at least three, wooden veneers are placed on top of it, between which are spaced layers of adhesive-10. A flexible airtight bag is connected around the veneer assembly, which is connected to a vacuum pump. The pressure reduction in this bag compresses the veneers tightly against the mold, for example at 1380 to 2070 kPa, which is further enhanced by heating. The result is an exactly mold-shaped plate-like body that is self-supporting, i.e. free of macroscopic stresses. 15 Although such a method can be used to make interior panels as such, firstly, the method is slow and expensive, and secondly, all panels would be exactly the same. A structure made up of similar panels like this, the wall would be quite monotonous, and not stimulating. If each individual panel were to have its own custom mold, the cost of the nou-20 would be even higher.

Thus, it is an object of the invention to provide a method for producing panels that look and feel of wood and have irregular surface shapes which, if necessary, provide easy production of panels having different: unique surface shapes. It is another object of the invention to provide such a method which, if necessary, would allow the manufacture of panels having individual irregular surface-like structures by simple means and under ordinary conditions. It is a third object of the invention to provide such a method, which also provides, if necessary, panels whose surface forms continuously extend into one or more panels. It is a fourth object of the invention to provide a method for making panels capable of acting as acoustic panels or through which light is capable of being transmitted, if desired. ' · ·; löitymään.

: '/ The disadvantages described above can be eliminated and the objectives described above can be eliminated ··. ·! implemented by a method according to the invention, characterized by what is defined in the characterizing part of claim 1, and by a panel according to the invention, characterized by what is defined in the characterizing part of claim 14.

It has now surprisingly been found in the invention that panels have irregular surface shapes by simply attaching some of the edges of the panel-forming plywood to bars having irregularly wavy cutting surfaces. When the ribs on opposite sides of the panel have irregularly shaped cutting surfaces, the plywood attached thereto is formed to contain irregular bumps and valleys for which no corresponding molds exist. It should be noted that the shapes on the surface of the panel 10 are not replicas of the cutting surfaces having irregular waveforms at the edges of the panel, but have their own shape. Because the properties of plywoods vary slightly from one sheet of plywood to another, exactly the same ribs would result in some different panel surface shapes, so each panel is unique for this reason. The additional one-to-15 slab panel gain is achieved by continuously changing the waveform interface of the ribs cutting interface, which can be done using a computer and a suitable software program. However, even if the wave shape of the shear interface is repeated from time to time, a very large number of panels having a unique surface shape will be obtained because different combinations of certain ribs will result in different panel pin nanoforms at (N-1) !, where N is the number of different ribs. For example, 10 different ribs provide 362880 different panels. A particular advantage of the method of the invention is that it allows the use of separate operations or special devices, that is, in a way "commercially available" parts, such as; These allow the plywood to be pressed precisely into undulating wavy: 25 ribs for gluing. However, the panels according to the invention can be manufactured so that the surface shape extends step by step from one panel to another, whereby the large combination of panels is achieved. The panels of the invention may also be manufactured for acoustics and / or for light transmission. Further, the manufacture of panels according to the invention is simple provided only a suitable controlled cutting device or sawing device 1 * and a simple squeezing press are provided. If needed, panels can also be made with hand tools.

I ·: '' The invention will now be described in detail with reference to the accompanying drawings.

35 · Figures IA and IB generally show one example of a panel according to the invention, viewed from above and in perspective, from approximately two opposite directions, shown with intact lines. Further, Fig. IB schematically depicts the following panel, which is steplessly suitable for the extension of the panel with colon dots.

Fig. 2 is an axonometric view of a frame consisting of two top or bottom of mold bars and two top or bottom of support bars 5, according to the invention, to obtain a panel according to Figs.

Fig. 3 shows the cutting or sawing of the mold strip in accordance with the invention in half into an upper part and a lower part, in axonometric view, with intact lines. The figure also shows the log being cut or sawed in half with the top and bottom with colon dashes.

Fig. 4 shows the simultaneous cutting or sawing of two mold strips according to the invention into top sections and bottom sections, which allow continuity of the panel surface contours, in axonometric view. The figure also schematically shows the working distance at which cutting / sawing takes place.

Figures 5A and 5B show a sizing press according to the invention for making one panel, in cross section corresponding to planes II-II in Figures IA and 5B, and viewed from the side corresponding to direction I in Figures IA and 5A.

Figures 6A and 6B show a sizing press according to the invention for making two panels equal in length, in cross section corresponding to planes IV-IV in Figures IA and 6B and in a side view corresponding to direction III in Figures IB and 6A.

»I 4:: Method in the simplest version, the plywood panels 11, 12 have only the two opposite edges of the upper ribs Ib, 2b or the lower parts: 1a, 2a to which the opposite edges 10 of the plywood 7 are glued 9a. Figures 1. · ". 25 and 2 may also illustrate such simple panels, which are not, in particular, of the best stability, but may be usable in some situations. However, they also have irregular elevations and valleys. To this end, the method comprises the following steps. take formformers ·; * 'dies 1, 2 with lengths Lm corresponding to, i.e., are of sufficient length to obtain; * ·· 30 panel lengths Lp or widths W of the desired outer dimensions of the panel or slightly smaller load-bearing members; the heights Hm are greater than the maxima Hp of the difference in elevation and valleys in the panel.

''. Second, the forming ribs are cut longitudinally in half into the upper portions Ib, 2b and into the lower portions 1a, 2a so that the cutting interface 5 is wavy in the desired longitudinal direction and rectilinear against the length and height of the ribs, as shown in Figures 3 and 4. to be made by a slot-cutting tool, such as a band saw or milling machine or a water jet or a laser or other similar known or new means capable of cutting across the rib in the direction Hm of its height with a minimum and even gap. Such a cut forms the core of the invention because it produces two rib portions, i.e., the top and the bottom, which have exactly matching cutting surfaces 5a and 5b and the cutting surfaces 6a and 6b described below.

Next, the lower portions 1a, 2a of the first and second forming ribs 1, 2 are spaced upwardly from their cutting surfaces 5a and then the first plywood 7 is glued over these lower portions, and the first plywood 7 is glued 9a and the lower surface 7a of the first plywood between. Proceed by pressing the cut surface 5b of the first mold rib Ib above the upper surface 7b facing away from the lower surface of the first plywood at and in alignment with the lower mold portion 1a of the first mold rib 2b against the upper surface 7b facing away from the lower surface of the first ply in line with it. Thus, the two intersecting surfaces of the two ri-20 stomachs described above in the preceding paragraph, namely the top and bottom, are utilized here, although in this simplest case, the tops are, in a sense, only used as a shaping tool. Next, the upper portions Ib, 2b and lower portions 1a, 2a are pressed towards each other; with a force F such that the edges 10 of the plywood align themselves with the shapes of the cutting interface 5 between the lower parts and the upper parts and allow the adhesive 9a to cure. After this, the first panel 11 is removable from said tops at an interface marked T with the reference, located above the first plywood - ..,; between the surface 7b and the upper parts Ib, 2b of the moldings.

A considerably more robust panel is obtained by modifying the basic process of the invention described above to comprise the following additional steps and additional components. This version of the method is not the best in terms of production efficiency, but as the panel so manufactured corresponds to the most preferred embodiment of the invention. Now, the support bars 3 are added; 4 having lengths Lm corresponding to I 1 · · ', to form a frame slightly smaller than the desired outer dimensions of the panel, or ·; ·' - the widths W or the lengths Lp of the sides of the panel, and | '35 Heights Hm are greater than the maxima of the height: Hp of the height between the elevations and valleys in the panel. These support ribs are cut longitudinally into upper portions 3b, 4b 5111822 and lower portions 3a, 4a such that the cutting interface 6 is substantially straight in the longitudinal direction of the ribs and is either inclined or parallel to said length and transverse to the length and height of the ribs. In accordance with the basic idea of the invention, this cut results in the formation of two slats. that is, the upper part and the lower part having precisely matching cutting surfaces 6a and 6b. The above linearity requirement is due to the fact that the first and second plywoods 7, 8 can generally bend only to one of the rock sections, so that only two opposite edges 10 of the panel may be waveformed, such as the other two edges 10, or wedge-shaped. For example, if the angles C1 and C2 or angles C3 and C4 are considered in FIGS. 1A and 2, the waveform, i.e., the cutting surface 5a may first end at both angles at the same height from the lower faces le and 2c. . In case the waveform 15, i.e. the cutting surface 5a ends at opposite angles C1 and C2 or at opposite angles C3 and C4 at different heights from the lower surfaces le and 2c, the cutting surface 6a of the lower ribs 3a, 4a must be inclined towards the lower surfaces 1c, 2c 4a are wedge-shaped so that the cutting surfaces 6a of the lower parts of the support ribs meet the cutting surfaces 5a of the lower parts 1a, 2a of the moldings at angles 20. Thus, the first plywood 7 is adhered to the lower portions along its entire length 10 and, in the alternative described below, the second plywood 8 to the upper portions respectively. If the heights of the lower and upper members of the struts must be constant, such as half the height Hm of the struts, alternatively the struts may be taken; Otherwise made upper parts 3b, 4b and lower parts 3a, 4a having lengths: V 25 Lm correspond to panel widths W or lengths Lp and having heights: Hm '/ 2 are half the height of the moldings 1, 2. Such parts have inherently •: ··: shear surfaces 6a, 6b corresponding to length Lm.

[.. * In this version of the method, prior to the said arrangement of plywood,

I

'··· * the lower portions 3a, 4a of the first and second blocking members Lp or le-30 respectively of the width W of each other and in contact with the lower portions 1a, 2a of the moldings and *: the cutting surfaces 6a e.g. the cutting surfaces 5a, to form the panel frame 20 as shown in Fig. 2; 2. At the corners C1, C2, C3, C4, the lower parts of the forming and supporting ribs and

t I I

'... of course, respectively, the tops are preferably secured by adhesive or mechanical fasteners; 35 or interlocking shapes, such as salmon tail joints. • However, attachment is not always mandatory. Thereafter, a first ply 7 is provided on said lower portions, gluing 9a between all the cutting surfaces 5a and 6a of the lower portions 1a, 2a, 3a, 111822 6 4a and the lower surface 7a facing them. Next, first, the cutting surface 5b of the first forming strip Ib is pressed against and facing the upper surface 7b facing away from the lower surface of the first plywood, and the cutting surface 5b of the second forming strip 5b against the upper surface 7b of the second forming strip and secondly, and in line with, and in line with, the first plywood upper surface 7b at the first plywood base surface 7b at and with the second plywood top surface 7b at the second plywood base surface 4b , or similar. All of these presses are done advantageously, but not necessarily simultaneously. Finally, by analogy with the first version of the method described above, said upper portions Ib, 2b, 3b, 4b and lower portions 1a, 2a, 3a, 4a are pressed against each other with a force F such that the plywood edges 10 align with the intersection boundaries 15, 5, 6 shapes while allowing adhesive 9a to cure. After the adhesive has cured, the first panel 11 is removed from said tops at the interface designated T.

Thus, a most preferred embodiment of the plywood panel according to the invention is provided, comprising: the lower part 1a and 2a of the plastic ribs W or the length Lp, or the upper parts Ib and 2b, whose cutting surfaces 5a, 5b are corrugated longitudinally and linear in height in transverse direction; the lower part 3a and 4a of the supporting ribs or the upper parts 3b and 4b of the panel having a length Lp or a width W, respectively; straight cutting surfaces 6a, 6b; in said cutting surfaces 5a and 6a pointing in the same direction; or 5b and 6b with their edges 10 adhered to the plywood 7 or 8 by glue 9a or 9b, which edges 10 follow the cutting surfaces 5a and 6a; or 5b and 6b; and -... the whole 7 or 8 remains in a stress state.

** The most preferred embodiment of the method of the invention are the additional steps which, however, in the manufacture of several panels according to the invention reduce the total number of work steps required and considerably speed up the manufacture. To this end, a second plywood 8 is provided on top of the first plywood 7 on its lower portions 1a, 2a, 3a, 4a, against its lower surface 8a against the upper surface 7b of the first plywood. In any case, no 'glue' is placed between the first plywood 7 and the second plywood 8. Then, the cutting surface 5b of the first V 35 forming strip Ib is aligned with and aligned with the upper ply 8b of the second plywood, and the cutting surface 5b of the second forming strip 5b against the upper 8b of the second plywood 2a, and further along, the cutting surface 6b of the first support strip 3b against the upper ply 8b of the second plywood at and with the lower ply 3a of the first support strip 4b 5 against the upper ply 8b of the second ply, and in line with it, or similarly. For this purpose, before arranging said veneers 7, 8, it is most advantageous to position the tops 3b, 4b of the first and second support ribs spaced apart and in contact with the tops Ib, 2b of the moldings and the cutting surfaces 6b in the same direction as the cutting surfaces 5b of the moldings thus, the upper portions are preferably placed as finished frames 20 downwardly against the upper surface 8b of the second plywood 8, as shown in Figs. 6A and 6B, to glue 9b to the upper cutting surfaces 5b. 6b and another plywood facing the upper surface 8b. As before, said top portions Ib, 2b, 3b, 4b and bottom portions 1a, 2a, 3a, 4a are pressed against each other with a force F such that the plywood edges 10 align with the shapes of the cutting portions 5, 6 between the bottom portions and the top portions. Next, the two adhesives 9a, 9b are allowed to cure, after which the first and second panels 11, 12 are removed from one another along the interface 20T between the first plywood 7 and the second plywood 8. This detachment simply occurs by lifting off the two finished panels 11 and 12, since they are not attached to each other in any way, but are superimposed on each other only by the force F mentioned. for which and to press the edges 10 of the first plywood 7 in a precise shape; ] 'against the cutting surfaces 5a, 6a of the lower portions and respectively the peripheral edges of the second plywood 8. To form a precise pressure against the cutting surfaces 5b, 6b of the upper ribs.

Adhesives 9a, 9b between these cutting surfaces 5a, 6a and the edges of the first plywood 7 and respectively the cutting surfaces 5b, 6b and the edges of the second plywood 8 adhere the plywood edges to the lower portions la, 2a, 3a, 4a and the upper portions Ib respectively. , 2b. 3b,: "': 4b in corrugated and straight sectional surfaces after the panels have been removed» · · 30.

The waveguide shape of the cutting interface 5 between the upper parts Ib, 2b and the lower parts 1a, 2a of the moldings is arranged to be variable so that a plurality of different waveforms are available for the assembly of the panels. Ib, 2b and *, · · *. lower part la, 2a. To obtain sufficient variation, at least five different waveforms are used to produce 24 different panels, but typically at least seven different waveforms to produce 720 different panels, and preferably at least ten different waveforms, thus, there are 362880 different irons 111822 8. When there is a finite number of waveforms used, such as any of the above or any other number, the waveform 5 is alternating in series, however, the waveform 5 between the upper sections Ib, 2b and lower sections 1a, 2a each mold strip is unique, which is easily accomplished by using a computer not shown in the figures with a suitable program for controlling the slitting tool, and a practically infinite number of different waveforms for the cutting interface 5. R 7, 8 are prefabricated sheets of substantially straight plywood, for example, suitable commercially available plywood with at least three layers of veneer previously bonded to one another. The thickness of the first and second plywood 7, 8 is less than 1 mm, but preferably the thickness of the first and second plywood 7, 8 is between 0.3 mm and 0.7 mm, whereby the panels are at least somewhat transparent. Adhesives 9a, 9b are applied either to the surfaces 10 of the edges 10, 5b, 6a, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b, 6b or 6b Alternatively, the actual adhesive may be applied to one of these and the adhesive curing agent to the other of these, thereby providing a longer processing time for the parts to cure until the edges and ribs 5a, 5b, 6a, 6b of the plywoods 7, 8 come into contact. Any suitable adhesive may be used as the adhesive. The said pressing of the upper portions Ib, 2b, 3b, 4b and the lower portions 1a, 2a, 3a, 4a by force F to adjust the plywood edges 10 to conform to the shapes of the cutting interfaces 5, 6 is preferably accomplished. temperature. Thus, the invention does not normally use heating to shape the veneers, and therefore heat is not actually required, since the finished plywoods 7, 8 used in accordance with the invention, unlike individual wood veneers, are not: i: they are hardly formed by the heat. However, the temperature must be high enough and the environmental conditions must be such that the adhesives 9a. 9b co: '' J water properly. However, nothing prevents the use of elevated temperature to accelerate the curing of the adhesives 9a and 9b.

, 30 In the case that panels are desired in which one side »» * * * ^ 'of one panel has a waveform similar to one side of the other panel in waveform *. ··', whereby the projections of the plywood surfaces 7b, 8a and the valleys extend step by step from panel to panel, according to the invention as follows. The moldings are then cut lengthwise in half into the upper portions Ib, 2b and into the lower portions la. 2a along the said wavy cutting interface 5, two mold strips 1 and 101, or 2 and 5 · * 102 at a time - in the previously described case, one mold strip 1 or 2 at → 1 * * * 1 ', shown in parallel, as shown in Figure 4 111822 9. The identical top portions Ib, 2b and the bottom portions 1a, 2a are then used in the same position to make different panels by placing them on opposite sides of the different panels. This means that, in the cutting step shown in Fig. 4, the side surfaces 17 and 18 of the moldings 1 and 101 and the moldings 2 and 102, respectively, facing each other 5 or against one another are arranged as panels facing outwardly. In the case of Figure IB, the non-visible side surface of the front panel 11, 12 facing back is the first side surface 17 - shown in Figure 1A and the forward facing side panel of the rear panel 13, 14, 15, 16 which is invisible behind the front panel.

Specifically defined as follows: The first panel 11 comprises the lower portions 1a and 2a of the first and second mold strips 1 and 2, which are different, the first side surface 17 outwardly and the third panel 13 comprises the second side surface 18 of at least the lower portion 1a of the third mold strip 101. The second panel 12 comprises the first portions 17 and 2b of the first and second mold strips 1 and 2, which are different, the first side surface 17 outwardly and the fourth panel 14 comprises the second side surface 18 of the upper portion Ib of at least the third mold strip 101. The first panel 11 comprises the lower portions 1a and 2a of the first and second mold strips 1 and 2, which are different, the first side surface 17 outwardly, and the fifth panel 15 comprises the second side surface 18 of the lower portion 2a of the fourth mold strip 102. The second panel 20 12 comprises the first portions 17 and 2b of the first and second mold strips 1 and 2, which are different, the first side surface 17 outwardly, and the sixth panel 16 comprises the second side surface 18 of the upper portion 2b of the fourth mold strip 102. The two panels / * .. are then mounted in sequence for use: the first and third panels 11 and 13 · '·' * the bottom portions of the first and third moldings, respectively, the second and • 25 panels 12 and 14 the tops of the first and third moldings respectively * side by side, the first and fifth panels 11 and 15 next to the lower portions of the first and fourth quadrant moldings, the second and sixth panels 12 and 16 next to the first and fourth panels respectively. Thus, the texture of irregular * # ** 'bumps and valleys continues substantially unbroken from 30 panels to panel, except for a smaller or * i »· * *' gap between the panels. The panel can also be placed directly on each other.

t * II », Lower sections 1a and 2a of the moldings, and the upper parts Ib and 2b, and the lower parts 3a and 4a or the upper parts 3b and 4b of the support strips are dimensioned with an average height H to give the plywood 7 * 8 suitable clearance for each acoustical application. position, typically the lower surfaces le and 2c and the like.

»•>» I · t *

Claims (18)

111822 ίο A method for making plywood panels having irregular protuberances and valleys in the surface, characterized in that the method comprises the steps of: - taking form strips (1; 2) of lengths (Lm) corresponding to the panel lengths (Lp) or widths (W) and whose heights (Hm) are greater than the maximum height difference (Hp) between the elevations and valleys in the panel; - longitudinally cutting the forming ribs into upper parts (Ib, 2b) and lower parts (1a, 2a) such that the cutting interface (5) is wavy in the longitudinal direction and rectilinear in the transverse direction against the length and height of the ribs; - positioning the lower portions (1a, 2a) of the first and second moldings (1,2) upwardly from their respective cutting surfaces (5a) in width (W) or length (Lp) of the panel; - arranging, on said lower parts, a first plywood (7), glue (9a) between the cutting surfaces (5a) of the lower parts and a lower surface (7a) facing the first plywood; -printing the cutting surface (5b) of the first forming strip top (Ib) against and facing the upper surface (7b) facing away from the lower surface of the first ply and the cutting surface (5b) of the second forming strip top 20 (2b) against the upper surface (7b) facing away from the lower surface at and in line with the lower part (2a) of the second mold strip; - pressing said upper parts (Ib, 2b) and lower parts (1a, 2a) with one another. by force (F) that the edges (10) of the plywood align themselves with the shapes of the cutting interface (5) between the lower parts and the upper parts I · I • ·; 25. allowing the adhesive (9a) to cure; and ':: - detaching the first panel (11) from said tops. , ···. Method according to Claim 1, characterized in that the method t # further comprises the steps of: - taking out support strips (3; 4) of lengths (Lm) corresponding to the widths (W) or lengths (Lp) of the panel sides and having the heights (Hm) are greater than the maximum height difference (Hp) between the elevations and valleys in the panel; - longitudinally slicing the support ribs into upper sections (3b, 4b) and lower sections (3a, 4a) such that the cutting interface (6) is substantially straight in the longitudinal direction of the ribs and inclined either longitudinally and lengthwise; and linear in height in the transverse direction. 111822 Method according to Claim 1, characterized in that the method further comprises the step of: taking the upper sections (3b, 4b) and the lower sections (3a, 4a) of the supporting ribs having lengths (Lm) corresponding to widths (W) or lengths (Lp) of the panel sides, and whose heights (HmVi) are one-half the height of the forming ribs (1,2) forming the cutting surfaces (6a, 6b) corresponding to the cutting interface (6) parallel to the length (Lm). Method according to Claim 2 or 3, characterized in that the method further comprises the steps of: - prior to said arrangement of plywood, placing the lower portions (3a, 4a) of the first and second support strips along the panel length (Lp) or width (W) respectively. 10 apart and in communication with the lower portions (1a, 2a) of the moldings and upwardly on the cutting surfaces (6a, 6b) to form a panel frame (20); - superimposing on said lower parts a first plywood (7), glue (9a) between the cutting surfaces (5a and 6a) of all lower parts (1a, 2a, 3a, 4a) and the lower surface (7a) facing them; 15. pressed: the cutting surface (5b) of the first mold strip (Ib) facing and facing the upper ply surface (7b) facing away from the lower surface of the first ply and the cutting surface (5b) of the second mold strip (2b) against the top surface (7b) of the plywood at and in line with the lower portion (2a) of the second forming strip; and a cutting surface (6b) of the upper portion (3b) of the first supporting rib against the upper surface (7b) of the first ply at and with the lower portion (3a) of the first supporting rib and the upper portion of the second supporting rib. t a cutting surface (6b) of the part (4b) against the upper surface (7b) of the first plywood at and in line with the lower part (4a) of the rib, or respectively; t · *; -pressing said upper parts (Ib, 2b, 3b, 4b) and lower parts (1a, 2a, 3a, 4a): ·: · towards 25 with a force (F) such that the edges (10) of the plywood are aligned with the lower parts: and shapes of the shear interfaces (5, 6) between the upper parts; -: - allowing the adhesive (9a) to cure; and: #: - detaching the first panel (11) from said tops. Method according to Claim 4, characterized in that the method 30 further comprises the steps of: - arranging a second plywood (8) on its lower surface (8a) on a first plywood (7) over said lower portions (1a, 2a, 3a, 4a); against the upper surface (7b); - positioning: the cutting surface (5b) of the first mold strip (Ib) against and in line with the upper mold surface (8b) of the second mold strip, and the cutting surface (5b) of the second ply 111822 of the second mold strip (2b) against the upper surface (8b) at and in line with the lower part (2a) of the second mold strip; and a cutting surface (6b) of the first blocked upper part (3b) against and aligned with the upper surface (8b) of the second plywood and the cutting surface (6b) of the second plywood top (4b) against the upper surface 5 (8b) of the second plywood at and aligned with the lower part (4a), or respectively; glue (9b) between the cutting surfaces (5b, 6b) of the upper portions and the upper surface (8b) of the second plywood against them; pressing said upper portions (Ib, 2b, 3b, 4b) and lower portions (1a, 2a, 3a, 4a) against each other with a force (F) such that the plywood edges (10) align with the shear interfaces (5) between the lower portions and the upper portions (5); , 6) forms; - allowing the adhesives (9a, 9b) to cure; and - detaching the first and second panels (11,12) from each other. Method according to Claim 1, characterized in that the method further comprises cutting longitudinally the forming ribs into two upper portions (Ib, 2b) and lower portions (1a, 2a) along said corrugated cutting interface (5) at one or two forming ribs at a time. (1 and 101, or 2 and 102) at a time aligned in parallel; and that identical top portions (Ib, 2b) and bottom portions (1a, 2a) are used to make the different panels. Method according to Claim 1 or 6, characterized in that, in the method, the wave form of the cutting interface (5) between the upper parts (Ib, 2b) and the lower parts (1a, 2a) of the moldings is variable in the longitudinal direction. r ... The method according to claim 7, characterized in that in the method! ! a cutting interface (5) · * between the upper parts (Ib, 2b) and the lower parts (1a, 2a) of the moldings; the waveform is arranged to be individual or spatially varied in each mold edge. Method according to Claim 1, characterized in that the cutting interface (5) between the upper parts (Ib, 2b) and the lower parts (1a, 2a) of the moldings is cut with a slot-cutting tool (30) such as a band saw or mill or water jet or laser. The method of claim 1, characterized in that the first. and the second plywood (7, 8) are prefabricated substantially straight plywood panels; and that the thickness (S) of the first and second plywood (7, 8) is less than 1 mm. The method according to claim 10, characterized in that the thickness (S) of the first and second plywood (7, 8) is between 0.3 mm and 0.7 mm. 111822 A method according to claim 1, characterized in that said adhesives (9a, 9b) are applied: either to the lower portions of the ribs facing them or to the cutting surfaces (5a, 5b, 6a, 6b) of the plywood, or to the lower portions of the ribs or to the upper surfaces (5a, 5b, 6a, 6b), or both. Method according to Claim 1 or 4 or 5, characterized in that said compression of the upper portions (Ib, 2b, 3b, 4b) and lower portions (1a, 2a, 3a, 4a) by force (F) to place the edges (10) of the plywood to conform to the shapes of the cutting boundary surfaces (5, 6) are carried out at room temperature. 14. A plywood panel having irregular projections and valleys in its surface, characterized in that the panel comprises: - the lower parts (1a and 2a) or the upper parts (Ib and 2b) of the moldings spaced apart in width (W) or length (Lp), the cutting surfaces (5a, 5b) of which are wavy in the longitudinal direction and rectilinear in the transverse direction against the length and height of the ribs; 15. lower parts (3a and 4a) or upper parts (3b and 4b) of the support strips having straight cutting surfaces (6a, 6b) spaced apart from the length (Lp) or the width (W) of the panel; - said ply (7 or 8) facing said cutting surfaces (5a and 6a; or 5b and 6b) with adhesive (9a or 9b) on its edges (10), the edges (10) of which follow the cutting surfaces (5a and 6a; or 5b and 6b) forms; and - the plywood (7 or 8) remains fully stressed. 15. Two panels according to claim 14, characterized in that '. the first panel (11) comprises the lower portions (1a?) of the first and second moldings (1 and 2) and the third panel (13) comprises the lower part (1a) of the at least the third moldings (101); or, respectively, the second panel (12) comprises upper portions (Ib and 2b) of the first and second molded ribs (1 and 2) and the fourth panel (14) comprises at least the upper portion (Ib) of the third * * ψ molded rib (101). 16. Two panels according to claim 14, characterized in that, first, ···. the first panel (11) comprises the lower portions (la 30 and 2a) of the first and second moldings (1 and 2) and the fifth panel (15) comprises the lower part of the at least the fourth moldings (102): * ·· (2a); or, respectively, the second panel (12) comprises the top portions (Ib and 2b) of the first and second mold strips (1 and 2) and the sixth panel (16) comprises the top portion (2b) of the at least the fourth mold strip (102). 111822 The two panels according to claim 15 or 16, characterized in that they are mounted in series for use: the first and third panels (11 and 13) adjacent the lower portions of the first and third moldings, the second and fourth panels (12 and 14) of the first and third panels respectively. the upper portions of the mold strip take up 5 trucks, the first and fifth panels (11 and 15) adjacent the lower portions of the first and fourth mold strips, the second and sixth panels (12 and 16) adjacent the upper portions of the first and fourth mold strips respectively; whereby the surface with irregular bumps and valleys continues substantially unbroken from panel to panel. Panel according to claim 14, characterized in that the lower parts (1a and 2a) or the upper parts (Ib and 2b) and the lower parts (3a and 4a) or the upper parts (3b and 4b) of the forming ribs are dimensioned to give the plywood (7, 8) a suitable distance (H) from the intended anchorage for acoustic purposes. 15