DEVICE FOR DEPOSITING VENEERS

Abstract

The invention relates to a device for depositing veneers on a carrier board. In order to create a device and a method by which veneers can be applied to a carrier board particularly easily, quickly and precisely, provided in the region of an upper end of a transporting device is a veneer magazine, with at least two compartments which are designed to store and supply veneer strips, and with means for transferring the veneer strips from the compartments to the transporting device, wherein the transporting device extends from an upper end obliquely downwards in the direction of a lower end in the region of a transporting plane for the carrier board and is designed to transport at least two individual adjacent veneer strips from the upper end to the lower end and to deposit them on the carrier board.

Claims

1. A device for depositing veneer strips (8) on a carrier board (3), comprising in the region of an upper end of a transporting device (2) a veneer magazine (4) with at least one compartment (7) which is designed to store and supply veneer strips (8), means for transferring the veneer strips (8) from the compartments (7) to the transporting device (2), wherein the transporting device (2) extends from an upper end obliquely downwards in the direction of a lower end in the region of a transporting plane (TE) for the carrier board (3) and is designed to transport at least two individual adjacent veneer strips (8) from the upper end to the lower end and to deposit them on the carrier board (3).

2. The device according to claim 1, wherein an adjusting device for moving the transporting device (2) with respect to the transporting plane (TE) is arranged, wherein by means of the adjusting device an angle between an inclined plane formed by the transporting device (2) and the transporting plane (TE) can be varied preferably between 10° and 60° and/or the vertical distance of the lower end of the transporting device (2) from the transporting plane (TE) can be adjusted.

3. The device according to claim 1, wherein the means for transferring are designed as vacuum suction cups.

4. The device according to claim 1, further comprising a vacuum device for generating a vacuum on the transporting device (2) in order to fix the veneer strips on the transporting device (2).

5. The device according to claim 1, further comprising a displacement device for moving the veneer magazines (4) and/or the compartments (7) in a direction transverse to the transport direction (T).

6. The device according to claim 1, further comprising means for detecting the position of a veneer strip (8) on the carrier board (3).

7. The device according to claim 6, further comprising means for correcting the position of a veneer strip (8) on a carrier board (3).

8. The device according to claim 1, further comprising positioning aids for pre-positioning the veneer strips (8) in the veneer magazine (4).

9. The device according to claim 1, wherein a device for moving the veneer strips (8) is arranged on the transporting device in the direction transversely to the transport direction (T).

10. The device according to claim 1, further comprising a monitoring system for detecting the position of the veneer strips (8) on the transporting device (2).

11. The device according to claim 1, further comprising a synchronization device for synchronizing the transport of the carrier board (3) with the transporting device (2).

12. The device according to claim 1, wherein at least two veneer magazines (4) are arranged behind one another in the transport direction (T) of the veneer strips (8).

13. A method for depositing veneer strips (8) on a carrier board (3), having the steps of: positioning at least two veneer strips (8) next to one another and at a predefined distance from one another on a transporting device (2), moving the veneer strips (8) by means of the transporting device (2) along an obliquely downwards inclined plane to a low end of the transporting device (2), simultaneously transferring the veneer strips (8) from the transporting device (2) onto a carrier board (3) in such a manner that the veneer strips (8) are deposited on the carrier board (3) next to one another and at a predefined distance from one another.

14. The method according to claim 13, wherein, in accordance with a first alternative, a veneer strip (8) coated on at least one side with a binding agent is deposited on a carrier board (3) and wherein, in accordance with a second alternative, a synthetic resin-impregnated non-woven fabric or woven fabric is deposited on the carrier board (3), whereupon an untreated veneer strip (8) is deposited on the non-woven fabric or woven fabric.

15. The method according to claim 13, wherein at least one marking is affixed to the surface of the carrier board (3) or to the synthetic resin-impregnated non-woven fabric or woven fabric, which marking indicates the position of the veneer strip (8) to be deposited.

16. The method according to claim 15, wherein the position of a veneer strip (8) on the carrier board (3) or respectively a synthetic resin-impregnated non-woven fabric or woven fabric is detected and, if applicable, corrected.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The invention is explained in more detail below with reference to several exemplary embodiments, wherein:

[0054] FIG. 1 schematically shows a side view of a device for depositing veneer strips on a carrier board and a short-cycle press;

[0055] FIG. 2 schematically shows a top view of the device from FIG. 1.

DETAILED DESCRIPTION

[0056] Example 1 describes the basic principles of the individual method steps for manufacturing a veneer floor, using a device for depositing veneer strips.

[0057] FIG. 1 shows a side view of a device 1 for depositing veneer strips 8 (see FIG. 2) on a carrier board 2. The device 1 comprises two veneer magazines 4 which are arranged behind one another in the transport direction T. Each veneer magazine 4 is assigned a transporting device 2 arranged in the vertical direction V beneath the veneer magazines. The transporting devices 2 comprise conveyor belts for transporting veneer strips (not depicted here) coming from the veneer magazines 4 onto the carrier boards 3. The transporting devices 2 are arranged, extending obliquely upwards thereby starting from a transporting plane TE of the carrier panels 3 opposite the transport direction T. Each transporting device 2 consequently forms an inclined plane.

[0058] The carrier boards 3 are likewise moved along the transporting plane TE in the transport direction T by a transporting device (not depicted here) under the devices 1 and through the transporting devices 2 to a short-cycle press 5.

[0059] The lower ends 6 of the transporting devices 2 adjoin the transporting plane TE, so that veneer strips 8 coming from the transporting device 2 are laid on the carrier boards 3 moving in the transport direction T and carried along by said carrier boards.

[0060] The stack (not depicted here) made up of the carrier board 3 and laid veneer strips 8, if applicable supplemented by further layers, is moved into the short-cycle press 5 and pressed there under the influence of pressure and heat. During the manufacture of the veneer floors, the synthetic resin which is liquid under heat and pressure penetrates into the veneer strips 8, glues these to the carrier board 3 and forms a particularly resistant surface.

[0061] FIG. 2 schematically shows a top view of the device from FIG. 1. The two veneer magazines 4 which each have four adjacent compartments 7 transversely to the transport direction T can be clearly seen. A stack of veneer strips 8 is inserted into each compartment 7. In the transport direction T behind the two veneer magazines 4, a carrier board 3 is depicted, on which four veneer strips 8 are laid next to one another. The veneer strips 8, not depicted here, are laid on the carrier board 3 at a distance from one another and precisely positioned in a target position. The stack made up of the carrier board 3 and veneer strips 8 is ready to be moved into the short-cycle press 5 and pressed therein.

EXAMPLE 1

[0062] In the following, the manufacture of a veneer floor with the aid of the device for depositing the veneer strips 8 is explained, by way of example, on the basis of an exemplary embodiment. In order to manufacture the veneer floor, a full-format counter veneer is presented in a pulling device upstream of a short-cycle press 5. The veneer can, for example, be a poplar veneer having a thickness of 0.7 mm and a format of 2,800 mm×2,070 mm. A synthetic resin-impregnated non-woven fabric or woven fabric, here a melamine resin-impregnated paper, a so-called overlay, for example having a paper weight of 25 g/m.sup.2 and a final weight of 160 g/m.sup.2 at a Vc value of 6% in the same format as the veneer, is pulled onto this veneer. In addition to the melamine resin, the overlay contains the usual auxiliary substances such as hardeners, etc. In the next station, an 8 mm HDF in the same format as the veneer is deposited. Thereafter, a further overlay having the same parameters as the previous one is deposited. In addition, a quantity of 15 g fl./m.sup.2 of a black digital print ink was applied to this overlay. The stack thus manufactured, which is made up of the counter layer, overlay and HDF (hereinafter referred to as the carrier board 3) is transported along under the veneer magazines 4. In order to lay the veneer strips 8, veneer strips 8 made of oak having a format of 1,380 mm×300 mm×0.7 mm from a veneer magazine 4 having, for example, six compartments 7 are laid on a first half of the carrier board 3. This is carried out by lifting the oak veneers from the compartments 7 by means of a vacuum suction cup onto the transporting device 2 and being transported by the transporting device 2, which comprises vacuum conveyors, onto the overlay lying on the HDF. The compartments 7 were previously pre-positioned in accordance with the target position on the carrier board 3 transversely to the transport direction T. During the transport with the transporting device 2, the veneer strips 8 were, in addition, detected by a monitoring system and in the event of a deviation from the target position being detected, moved by means of a device transversely to the transport direction T. For an exact longitudinal positioning of the veneer strips 8 on the carrier board 3, a synchronization of the speed of the transporting device to the position and speed of the carrier board was, in addition, performed by a synchronization device.

[0063] A first end of the veneer strips 8 is laid on the carrier board 3 and then they are carried along by the carrier board 3 moving in the transport direction T. The veneer strips 8 are laid at a distance of 40 mm from one another. In addition, the two outer veneer strips 8, in each case, are away 35 mm from a longitudinal edge of the carrier board 3. This ensures that any clamping strips or similar, which may be arranged, do not displace or damage the outer veneer strips 8 when receiving the carrier board 3. The distance from the transverse edge is 10 mm. This covering is repeated on the second half of the carrier board 3, wherein a distance of approx. 20 mm is provided between the veneer strips 8 in the longitudinal direction in the middle of the carrier board 3. The thus covered carrier board 3 is subsequently transported into the short-cycle press 5 and pressed, for example, at a pressing temperature of 180° C. and a pressure of 35 kilo/cm.sup.2. Following the pressing and cooling, the large-format carrier boards 3 covered with veneer strips 8 and manufactured in this way are further processed to form floor coverings by means of a milling device, for example.

EXAMPLE 2

[0064] This exemplary embodiment coincides with Example 1; deviating or supplementary aspects are solely explained separately in Example 2.

[0065] A first veneer strip, which is manufactured from composite, in particular glued, veneer parts, and which, having the dimensions of 2800 mm×2070 mm, has the size of the carrier board, is extracted from the veneer magazine of a second device for depositing veneer strips and is deposited by way of the associated transporting device on a conveyor belt which runs in the transporting plane. This first veneer strip serves e.g., as a counter layer or as a decorative surface.

[0066] If the veneer is a veneer coated on one side with binding agent, the side coated with binding agent points upwards. Alternatively, if it is an untreated veneer, then a synthetic resin-impregnated non-woven fabric or woven fabric, mostly a melamine resin-impregnated paper, is subsequently deposited on the conveyor belt. The non-woven fabric or woven fabric, which is likewise the length and width of the carrier board, is extracted from a magazine which is arranged in the transport direction downstream of the veneer magazine for the first veneer strips.

[0067] The carrier board, e.g., an 8 mm thick HDF board, is then laid on the veneer or respectively the binding agent layer thereof or on the synthetic resin-impregnated non-woven fabric or woven fabric. The carrier board resting on the veneer or respectively on the non-woven fabric or woven fabric is conveyed onwards in the transport direction. As described above for Example 2, either one or more veneer strips which are coated with binding agent, or a synthetic resin-impregnated non-woven fabric or woven fabric and at least one untreated veneer strip, but in the reverse order to that described above, are laid on the carrier board. Veneer strips and, if applicable, synthetic resin-impregnated non-woven fabric or woven fabric as described above are in each case extracted from a magazine and deposited on the carrier board by means of the transporting device. The carrier board which is thus covered on both sides, in each case, with at least one veneer strip and optionally inserted, synthetic resin-impregnated non-woven fabric or woven fabric is subsequently pressed in a press according to Example 1.

EXAMPLE 3

[0068] This example also is based on Example 1 and only deviations from Example 1 are explained. The carrier board is conveyed in the transport direction in the transporting plane. Markings are affixed to the surface of the carrier board at a distance from one another, e.g., with a black or respectively colored ink or color. Alternatively, a synthetic resin-impregnated non-woven fabric or woven fabric is laid on the carrier board, wherein colored markings are affixed to the non-woven fabric or woven fabric.

[0069] The markings are either executed as dots or lines which indicate the position of one or more veneer strips. Two dots or lines are required, as a general rule, in order to predefine the position of a veneer strip. The markings are preferably produced with ink or color, but they can also be produced in a different way. The markings can also be designed as an area, in particular a colored area, wherein the area then indicates the position of the veneer strip or the area which is not covered by the veneer strip.

[0070] The distance of the veneer strips can, in principle, be freely chosen, but is mostly limited to a few mm or cm in order to avoid waste. E.g., a distance of up to 5 cm, preferably of up to 3 cm, can be deemed to be generally standard. The predefined minimum distance between two veneer strips can be 0.3 mm.

[0071] The veneers are e.g., positioned such that they cover individual boards which are to be manufactured from the veneered carrier board. The space between the markings is accordingly provided for the kerf. Optionally, the space can also comprise regions which are to be worked in order to produce a profile at the edges of the panels to be manufactured. Due to the arrangement of veneer strips at a distance from one another, the veneer is deployed in a targeted manner and without waste in order to produce decorative surfaces.

EXAMPLE 4

[0072] According to a further development of Example 3, the device for depositing veneer strips on a carrier board comprises means for detecting the position of the veneer strip or respectively the veneer strips as well as the markings on the carrier board or respectively the synthetic resin-impregnated non-woven fabric or woven fabric, which means are arranged in the transport direction downstream of the at least one veneer magazine and the respective associated transporting device above the transporting plane. These means for detecting the position of the veneer strip or respectively the veneer strips, e.g., a camera, detect whether the markings are completely covered by the veneer strips or not. If the means for detecting the position detect at least one marking completely or partially, a corresponding signal then causes the control apparatus to operate means for correcting the position of the veneer strip on the carrier board or respectively the synthetic resin-impregnated paper. The control apparatus determines which movement of the veneer strip is required in order to reach the predefined position, in which all of the markings are completely covered. The means for correcting the position, e.g., a slide or a clamping device, are then brought into contact with the veneer by means of the control apparatus in order to displace or turn the veneer strip until the desired position is reached.

LIST OF REFERENCE NUMERALS

[0073] 1 Device [0074] 2 Transporting device [0075] 3 Carrier board [0076] 4 Veneer magazines [0077] 5 Short-cycle press [0078] 6 Lower end [0079] 7 Compartments [0080] 8 Veneer strips [0081] T Transport direction [0082] TE Transporting plane