METHOD, MANUFACTURING CELL, AND WOOD VENEER

Abstract

A manufacturing cell for producing a three-dimensionally deformable wood veneer, includes a receiving surface for receiving a wood veneer to be processed, and a device for partly or completely separating the wood veneer in order to form veneer strands. The cell further includes a device for pressing the wood veneer to be processed and the veneer strands against the receiving surface. The device is designed to generate a pressure difference between a first side and a second side of the wood veneer to be processed and the veneer strands.

Claims

1. A method for producing a three-dimensional deformable wood veneer, the method including the following steps: Providing a wood veneer on a receiving surface, the wood veneer having a first side abutting the receiving surface, Partial or complete separation of the wood veneer into a plurality of veneer strands, and Producing joints between the veneer strands; wherein the wood veneer and the veneer strands are pressed against the receiving surface by creating a pressure difference, where a first pressure is present on the first side of the wood veneer and veneer strands, wherein a second pressure is present on a second side of the wood veneer and veneer strands facing away from the first side, and where the first pressure is smaller than the second pressure.

2. The method, according to claim 1, wherein the veneer strands are extended along a first direction and the making of joints between the veneer strands is performed along a second direction, the second direction being different from the first direction.

3. The method, according to claim 1, wherein the first pressure is generated by a vacuum pump and/or that the second pressure is the atmospheric pressure of a working environment. and/or that the second pressure is generated by a pump.

4. The method, according to claim 1, wherein the wood veneer and/or the veneer strands are pressed against the receiving surface by at least one hold-down device.

5. The method, according to claim 1, wherein the partial or complete separation of the wood veneer is performed by means of one knife or by several knives, wherein at least one knife is a rolling knife, a perforating rolling knife or a scoring knife.

6. The method, according to claim 1, wherein the making of joints between the veneer strands is carried out by applying an adhesive, a plurality of adhesive strands being applied, wherein the adhesive is applied while the partial or complete separation is carried out.

7. The method, according to claim 1, wherein the wood veneer has at least one wood ply and at least one textile ply, and the production of joints between the veneer strands is carried out by not cutting the textile ply during the partial or complete separation of the wood veneer or by not cutting the textile ply at least in sections.

8. A manufacturing cell for producing a three-dimensional deformable wood veneer, having a receiving surface for receiving a wood veneer to be processed, having a device for partially or completely separating the wood veneer to form a plurality of veneer strands, and including a device for pressing the wood veneer to be processed and the veneer strands against the receiving surface, the device being arranged for generating a pressure difference between a first side and a second side of the wood veneer to be processed and the veneer strands.

9. The manufacturing cell, according to claim 8, further comprising a vacuum pump, and/or an application device for applying adhesive for joining the veneer strands, wherein the application device for applying adhesive has a heating device for adjusting the adhesive temperature continuously.

10. The manufacturing cell according to claim 8, further comprising at least one hold-down device for clamping the wood veneer against the receiving surface.

11. The manufacturing cell, according to claim 8, wherein the device for partially or completely cutting the wood veneer has a cutting device with at least one knife and/or is continuously adjustable in two, three or more coordinate directions and/or has a stop for limiting the depth of the cut.

12. A three-dimensional deformable wood veneer, wherein the wood veneer comprises interconnected veneer strands, wherein the wood veneer comprises at least one wood ply and at least one textile ply, wherein the veneer strands are interconnected by the textile ply, and wherein the textile ply is not cut or at least partially not cut, and/or produced according to a method according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0116] The disclosure is described in more detail below with reference to a drawing illustrating examples of embodiments. It shows schematically in each case:

[0117] FIG. 1A a top view of a manufacturing cell according to the disclosure;

[0118] FIG. 1B a side view of the manufacturing cell according to the disclosure;

[0119] FIG. 2A a first process step of a method according to the disclosure;

[0120] FIG. 2B a second process step of a method according to the disclosure;

[0121] FIG. 2C veneer strands;

[0122] FIG. 2D veneer strands;

[0123] FIG. 2E a third process step of a method according to the disclosure;

[0124] FIG. 2F a three-dimensional deformable wood veneer;

[0125] FIG. 2G a three-dimensional deformable wood veneer;

[0126] FIG. 3A a three-dimensional deformable wood veneer;

[0127] FIG. 3B a three-dimensional deformable wood veneer;

[0128] FIG. 4A a three-dimensional deformable wood veneer;

[0129] FIG. 4B a three-dimensional deformable wood veneer;

[0130] FIG. 5A a rolling knife; FIG. 5B a perforating rolling knife;

[0131] FIG. 6A a thread applicator in a top view;

[0132] FIG. 6B a side view of the thread applicator from FIG. 6A;

[0133] FIG. 6C the thread applicator of FIG. 6A in a further side view

[0134] FIG. 7A a further manufacturing cell according to the disclosure in a top view; and

[0135] FIG. 7B a side view of the manufacturing cell according to the disclosure from FIG. 7A.

DETAILED DESCRIPTION OF THE DRAWINGS

[0136] FIG. 1A shows a manufacturing cell 2 for producing a three-dimensional deformable wood veneer, with a receiving surface 4 for receiving a wood veneer 6 to be processed. The receiving surface 4 is a plane surface oriented parallel to a plane x-y of the Cartesian coordinate system x-y-z, according to FIG. 1A. The receiving surface has a porous material.

[0137] The manufacturing cell 2 has a device 8 for partially or completely separating the wood veneer 6 into a plurality of parallel veneer strands 10. The veneer strands 10 are extended parallel to a z-axis of the Cartesian coordinate system x-y-z according to FIG. 1A.

[0138] The manufacturing cell 2 has a device 12 for pressing the wood veneer 6 to be processed and the veneer strands 10 against the receiving surface 4, wherein the device 12 is arranged to generate a pressure difference between a first side 14 and a second side 16 of the wood veneer 6 to be processed and the veneer strands 10 (FIG. 1B).

[0139] The device 12 has a vacuum pump 18 which is connected to a plate 21 via hose connections 19, the receiving surface 4 is formed on the plate 21 and wherein the plate 21 is made of the porous material at least in the area of the receiving surface 4. The plate 21 may be sealed on a side facing away from the receiving surface.

[0140] The vacuum pump 18 is arranged to generate a negative pressure as a first pressure in the region of the side 14, the negative pressure being lower than an atmospheric pressure of a working environment U present at the second side 16 (FIG. 1B).

[0141] Furthermore, an application device 20 for applying adhesive 22 for joining the veneer strands 10 is provided. The adhesive 22 is an adhesive thread 22. The application device 20 for applying the adhesive 22 is a thread applicator 20 and has a heating device 24 in which heating nozzles 25 are resiliently mounted, and wherein the heating device 24 is set up for heating the heating nozzles 25 and for continuously adjusting the adhesive temperature (FIG. 6B).

[0142] Each of the heating nozzles 25 is pressed resiliently against the veneer strands during the application of the adhesive, the resilient mounting of the heating nozzles 25 being effected by means of respective associated springs 27.

[0143] The device 8 for partially or completely cutting the wood veneer 6 has a cutting device 26 with a plurality of rolling knives 28, which, viewed in the y-direction, are arranged at equidistant distances from one another.

[0144] The cutting device 26 is continuously adjustable in each coordinate direction x, y and z.

[0145] The application device 20 is continuously adjustable in each coordinate direction x, y and z.

[0146] According to alternative embodiments, the cutting device 26 and the application device 20 may be held on a common tool holder.

[0147] Stops 30 may be provided to limit the depth of the cut.

[0148] Manufacturing cell 2 has two hold-down devices 32 to fix the wood veneer 6. For better clarity, the hold-down device 32 is shown transparently in FIG. 1B. According to alternative embodiments, a single hold-down 32 can be provided.

[0149] In addition, the device 20 may have additional hold-downs 33 that press the veneer 6 against the receiving surface 4, as shown in the example according to FIGS. 7A and 7B. FIGS. 7A and 7B show a further embodiment of a device 20 having additional hold-downs 33. The hold-downs 33 are traveling hold-downs 33, one hold-down 33 being arranged to lead the rolling knives 28 and one hold-down 33 being arranged to lag the rolling knives 28. The hold-down devices 33 ensure that the veneer strands are not lifted off the receiving surface 4 by the rolling knives 28. The hold-down devices 33 are resiliently clamped elastically against the wood veneer or the veneer strands.

[0150] In a first process step, the wood veneer 6 is provided on the receiving surface 4, with a first side 14 of the wood veneer 6 resting against the receiving surface 4.

[0151] The wood veneer 6 is pressed against the receiving surface 4 by generating a pressure difference by means of the vacuum pump 18. This also causes the wood veneer 6 to lie flat against the receiving surface 4, so that the wood veneer 6 lies against the receiving surface 4 over its entire surface and essentially without any gaps.

[0152] A vacuum is generated by means of the vacuum pump 18 in the region of the first side 14 as a first pressure, which is lower than an atmospheric pressure of the working environment U in the region of the second side 16. The first pressure is generated as a static pressure and is kept substantially constant throughout the subsequent processing.

[0153] Further, the wood veneer 6 is fixed with the hold-downs 32, whereby additional hold-downs 33 can be provided for fixing. Subsequently, in a second process step, the wood veneer 6 is completely separated into a plurality of veneer strands 10, the veneer strands 10 being extended along a first direction, in this case, parallel to the z-axis.

[0154] As can be seen from FIGS. 2C and 2D, the veneer strands 10 have been completely separated from each other, but according to FIG. 2B they are still held in position by the pressure difference.

[0155] In a third process step, connections 22 are made between the veneer strands 10 along a second direction, the second direction being different from the first direction and being oriented parallel to the y-axis. Thus, the first and second directions are oriented perpendicular to each other.

[0156] The joints 22 are adhesive threads 22. The adhesive threads 22 or adhesive strands 22 form a shear deformable transverse bond.

[0157] FIGS. 2F and 2G show a finished three-dimensional deformable wood veneer 34 comprising the veneer strands 10 and the shear deformable cross-bond formed from the adhesive threads 22.

[0158] FIGS. 3A and 3B show a finished three-dimensional deformable wood veneer 36 consisting of the veneer strands 10 and the shear-deformable cross-laminate formed from the adhesive threads 22. The wood veneer 36 differs from the wood veneer 34 in that the veneer strands 10 have not been completely separated in the x-direction, i.e., in the thickness direction, but only partially.

[0159] FIGS. 4A and 4B show a finished three-dimensional deformable wood veneer 38 comprising the veneer strands 10. The veneer strands 10 have a nonwoven layer 40 and a wood layer 42 that has been partially separated by perforating knives with interrupted cuts. There are no adhesive threads, but the nonwoven ply 40 forms the shear-deformable cross-bond here. When the three-dimensional deformable wood veneer 38 is deformed, the existing cross-connections of the wood ply 42 break, while the shear-deformable cross-connection of the nonwoven ply remains intact. FIG. 5A shows a roller blade 44, with a circular, uninterrupted cutting edge 46.

[0160] FIG. 5B shows a perforating roller blade 48, with a segmented cutting edge 50.

[0161] FIGS. 6A, 6B and 6C show the thread applicator 20 in three views. The filament applicator 20 has two heating nozzles 25, so the filament applicator 20 can apply two adhesive filaments simultaneously.

[0162] The thread applicator 20 has the heating device 24, in which the heating nozzles 25 are spring-mounted. The heating device 24 is set up to heat the heating nozzles 25 and to continuously adjust the adhesive temperature.

[0163] Each of the heating nozzles 25 is pressed resiliently against the veneer strands during the application of the adhesive, the resilient mounting of the heating nozzles 25 being effected by means of respective associated springs 27.

[0164] Each heating nozzle 25 is associated with a filament spool 48 from which the respective adhesive-coated filament 22 is unwound.