SE532582C2 - Method of manufacturing a wood-based furniture component comprising integrated spacer - Google Patents

Description

25 532 582 manufacturing and to speed up the time for the manufacturing process of chipboard. At the same time, it wants to be able to simplify chip handling before building up the chip mat for compression, which would mean less complicated and thus more cost-effective process equipment.

In addition, the lower weight of the finished furniture component would mean cheaper and more environmentally friendly transport.

There is also a need to provide spacer means arranged for the chipboard in the case of furniture chipboard without the need to expand the production line with additional equipment for the manufacture of such a spacer. Spacers are today used as cardboard-based spacers interposed between two furniture components, such as two chipboards, to make the furniture chipboard lightweight. Achieving such cardboard-based spacers requires additional manufacturing equipment.

Fiber boards with reinforcements are today manufactured in different ways. For example, boards with ribbed reinforcement are described in US 4,904,517. The area for the grooves has a density that is 15% lower than the density of the rest of the board and the grooves have a fiber orientation which is essentially the same as for the board. In this way a reinforced disc is obtained.

A known manufacturing method for manufacturing hollow chipboard, so-called tubular chipboard, means that the chip mat during compression encloses heated continuous parallel bars during a so-called extruded bar pressing. The finished board comprises parallel channels giving the board a lower weight than a homogeneous one.

The rods provide cavities and provide heat for curing of the chip material. These boards have a long pressing time due to the relatively large thickness of the pre-pressed board.

Prior art thus suffers from various disadvantages. This can be the complicated process equipment, inefficient handling of process equipment during the manufacturing process, the lack of fl flexibility at a production line, long pressing time, etc. It is desirable that the completed clamping disc is simple in construction, has low weight and is rigid.

SUMMARY OF THE INVENTION The problem is solved by the method described in the introduction, which method is characterized by the steps stated in claim 1.

Thus, a spacer has been provided with a chipboard, which spacer is arranged for joining with another furniture building element at the same time as the spacer makes the chipboard stiffer, without a furniture chipboard having to be made thicker.

By using the same type of chipboard raw material (such as wood shavings and glue) for the spacer corresponding to the type used for the partition portion not comprising said spacer, in one and the same manufacturing process a reinforced furniture chipboard (constitutes a wood-based furniture component) with integrated spacer can be produced without additional cost. process equipment. The wood-based furniture component can thus be used as a table splint at a table comprising table legs. The wood-based furniture component can thus comprise table legs mounted on the chip segments.

Thus, spacers can be provided integrated with the chipboard, which spacers have a substantial height above the side of the chipboard 532 582 resulting in a satisfactory distance between the surface of the chipboard (connecting spacers) and the surface of the spacers for joining a table leg.

The portion of the chipboard not comprising said spacer is thus thinner than a traditional homogeneous chipboard. Such a thinner chipboard batch can be manufactured more cost-effectively because the pressing time of the process is significantly reduced, which in turn allows for higher capacity (production of more furniture chipboard per unit time at one and the same production line).

Adhesives can be thermoplastic adhesives such as PVac or hot melt adhesives. Alternatively, thermoset adhesives can be used, such as UF adhesive, UMF, FF (phenol), PMDI adhesive.

Other examples are tannin-based adhesives. The edge areas of the final wood-based furniture component may be provided with thinner edge strips (the thickness of the edge strip corresponding to the thickness of the spacers) comprising filling material fitted in cavities at said edge areas.

Alternatively, the edge areas can be provided with stronger spacer material for attachments, such as screw attachments, hinges, etc. In this way, with reinforced attachment, fastening elements can be attached to the edge areas of the furniture component. If a hollow furniture chipboard is desired with a thickness of 18 mm, the portions of the chipboard and board element, not including spacers, can be provided with a thickness of 3 mm and the spacers with a height of 6 mm each.

In this way, the chipboard can be produced with spacers at the corners of the chipboard, which spacers also act to stiffen the chipboard, and furniture legs are mounted at the corners. Utilizing the height of the spacers, the furniture legs can be manufactured shorter and thus less material is used for furniture legs, which is cost-effective. Shorter furniture legs 532 583 also means less bulky packaging when transporting a non-assembled piece of furniture comprising furniture legs, such as a table.

Preferably, the side of the chipboard facing away from the side comprising projecting chip segments is smooth.

Thus, the chipboard can be used to provide a piece of furniture or wood-based furniture component comprising a smooth surface, such as a table surface or top surface.

Conveniently, the joining takes place because the chipboard is still hot after the compression step.

In this way, post-heating (residual heat) can be used for curing the joining glue without the need for additional heat, which is cost-effective. The joining immediately after the compression step also provides a manageable product right from the start. The product is at once stiffer for handling than a simple hot plate.

Preferably, the projecting chip segment of the chipboard is bud-shaped.

Thus, predetermined points of the furniture chipboard can be determined on the basis of wishes regarding the rigidity of the furniture chipboard, while the amount of raw material (including chip material and glue) for building up the chipboard can be as small as possible.

Preferably, the projecting chip segment of the first chipboard consists of strands which are wider than the space between the strands.

Thus, wood chips can be spread on the chip mat with a predetermined thickness for building up integrated spacers based on the desired height and / or spread of said spacers. 10 15 20 25 532 582 Preferably, the compression step takes place by means of a clock press.

In this way, a number of chipboards can be manufactured in one and the same process, which is cost-effective. Particleboard can be produced in one manufacturing step as large-format boards that are finished sawn into board components based on prevailing requirements or directly as board components for end purposes. The press tool of the clock press can advantageously be arranged with spikes for forming guide holes in the chipboard, which guide holes can be used for positioning the second furniture component building element at the chipboard.

DESCRIPTION OF THE DRAWINGS In the following, the present invention will be explained in more detail with reference to the accompanying drawings, in which schematically: FIG. 1 shows a so-called continuous pressing equipment used for the production of chipboard comprising knobs; FlG. 2 shows an example of a chipboard made by means of the continuous press in FIG. 1; FlG. 3 shows an example of chipboard made by means of a clock press shown in FlG. 6a; FlG. 4 shows an example of chipboard made by means of the continuous press in FIG. 1; FlG. 5 shows the joining (stack-gluing) of the spacers of pre-pressed chipboard with the spacers of other pre-pressed chipboards in stacks; FIG. 6a-6c show an example of the production of a chipboard comprising integrated spacers; FIG. 7 shows the production of chipboard in a clock press according to a further embodiment; 10 20 25 532 582 FIG. 8 shows an embodiment in which the recess of a tool surface has inclined walls; and FIG. 9a-9b show an embodiment in which a chipboard is produced comprising spacers, which spacers are joined to four furniture legs.

DESCRIPTION OF PREFERRED EMBODIMENTS The present invention will now be described as an exemplary embodiment. For the sake of clarity, components without significance for the invention have been omitted from the drawing. The same details that appear in fl era fi gures may in some cases lack a reference designation, but correspond to those that have a reference designation.

FIG. 1 shows a so-called first continuous pressing equipment 1 'according to the prior art used for the production of chipboard 3' comprising knobs 5 (spacers). Wood chips 7 are fed via a distribution device 9 which distributes glued wood chips 7 on a belt 11. The glued chips 7 are spread in a layer forming a chip mat 13. The chip mat 13 is pre-pressed in a pre-press (not shown) and hot-pressed in a hot press 15 under pressure. and heat (about 180-250 ° C). The hot press 15 comprises a forming strip 17 having a tool surface 19 comprising recesses 21 for forming the knobs 5 on one side of the pre-pressed chipboard 3 '.

The wood shavings 7 can be made of wood raw material (shavings or wood chips) and / or other lignoceilulose material and can consist of, for example, knife-cut shavings from round wood, sawdust or ice shavings. Other chip materials may be flax straw, hemp and bagasse. After pressing, the chipboard 7 is cut and given a fixed structure.

FIG. 2 shows an example of a chipboard 3 made by means of the continuous press 1 * in FIG. 1. The chip 3 is shown in a view from below.

FIG. 3 shows an example of chipboard 3 in a bottom view (the underside of which is såsom as the side of the chipboard 3 having spacers) made by means of a clock press (see also FIGS. 6a-6c). The chipboard 3 is provided comprising strands 27 constituting spacers.

The strands 27 are wider than the space between the strands 27.

Wood chips 7 are spread on the chip mat 13 with a predetermined thickness for building up the strands 27 based on the desired height and / or spread of said spacer. The chipboard 3 is provided in large format, which after production is sawn to sizes for end purposes (according to dashed lines).

FlG. 4 shows another example of chipboard 3 made by means of the continuous press 1 'in FIG. The knobs 5 are positioned in such a way that the middle row of knobs 5 has a distance between the two nearest knobs corresponding to twice the distance between the nearest knobs of the adjacent row. The tool surface 19 is provided with spikes for forming two guide holes 29 in the chipboard 3, which guide holes 29 are used for positioning a second chipboard so that the knobs of the chipboards end up in position for joining each other. That is, the guide holes 29 of the two chipboards 3 must be in line with each other at the joint.

FIG. 5 shows joining of spacers (knobs 5) of pre-pressed chipboard 3 with other pre-pressed substantially identical chipboards 3 knobs (knobs 5) in stack (stack-gluing) in a joining apparatus 31 seen from the side.

The joining apparatus 31 comprises guides 33 for aligning the stack with chipboards 3 so that the knobs 5 for joining assume the correct position.

F lG. 6a-6c show an example of the production of a chipboard 3 comprising integrated spacers in the form of knobs 5. The chipboard 3 is shown from the side. The chipboard 3 is produced in a bar press 35. The bar press 35 comprises an upper forming tool part 37 comprising projecting press means 39. The bar press 35 further comprises a hollow plate 41 comprising holes 43. After a chip mat 13 is applied to a smooth bottom plate 45 of the bar press 35 the holding plate 41 is placed The chip mat 13. An additional amount of molded wood chips 7 is filled into the holes 43 of the perforated plate 41. Under heat, the press member 39 of the mold part 37 is then lowered into the holes 43, whereby the mold part 37 compresses the chip mat 13 via the perforated plate 41 and by the projecting members 39 the knobs 5. The completed compression is shown in FIG. 6b. In FIG. 6c shows the exposed chipboard 3 comprising knobs for joining to another furniture component building element.

The final manufacturing step of joining another furniture component to the spacers according to one embodiment is described in connection with the explanation of F1G. 9a below, in which the second furniture component building element consists of four furniture legs.

The chipboard and furniture legs form the wood-based furniture component. l FlG. 9a, the spacers provide a distance from the side of the chipboard 3 adjacent the spacers to the joining surface of the spacers, resulting in the furniture chipboard 24 being made stronger while material costs can be saved.

That is, the method of making a furniture chipboard 24 comprises the steps of distributing wood chips 7 forming a chip mat 13 so that the chip mat 13 comprises one or more raised areas, after which the chip mat 13 is compressed by means of a tool surface (such as the tool surface 39 and 13) having one or more recesses (holes 43) for forming your protruding chip segments 53, forming said spacer 8 (the knobs 5), after which the pre-pressed chipboard 3 is discharged and finally joining the pre-pressed chipboard 3 projecting with a chip segment 53 protruding. another furniture component building element.

Furthermore, FIG. 7 shows a clock press 35 for producing four identical chipboards 3. In pairs, these chipboards 3 are joined together via their spacers (here knobs 5). The portion of the chipboard 3 not comprising said spacer is thus thinner than a traditional homogeneous chipboard. Such a thinner chipboard batch can be manufactured more cost-effectively because the pressing time of the process is significantly reduced, which in turn allows for higher capacity (production of more furniture chipboard per unit time at one and the same production line). Additional cost efficiency is achieved by the clock press 35 in FIG. 7 simultaneously produces four chipboards 3 thereby increasing the capacity of the production line.

FlG. 8 shows an embodiment in which the recess 57 of the tool surface has inclined walls 59. Thereby a drop angle is provided, which simplifies the removal of the pressing tool from the pre-pressed chipboard 3.

FIG. 9a-9b show an embodiment where a chipboard 3 is produced comprising spacers constituting a framework 71, which spacers are joined to four furniture legs 73. The chipboard 3 comprising spacers and the furniture legs 73 form a furniture chipboard which can be used as for example table furniture.

The present invention is not limited by the embodiments described above, but combinations of the described embodiments and similar solutions are within the scope of the invention. Other methods of joining the pre-pressed chipboard with another furniture component building element can be that the joining takes place by gluing together under the action of two steel strips, etc.

Claims (6)

10 15 20 532 582 12 PATENT REQUIREMENTS A method of manufacturing a wood-based furniture component (24), the method comprising the steps of: - distributing chips (7) forming a chip mat (13), wherein the step of distributing chips (7) also comprises distributing chips (7) so that the chip mat (13) comprises one or more raised areas with predetermined thickness for building up chip segments based on the desired height and / or spread of spacers (71); - compressing the chip mat (13) by means of a tool surface (19) having one or more recesses (21) for forming one or more projecting chip segments (53), forming the spacers (71), and the compression takes place by means of a bar press; discharging the pre-pressed chipboard (3); and joining the projecting chip segment (53) of the finished pressed chipboard (3) with a furniture leg (73). A method according to claim 1, wherein the side of the chipboard (3) facing away from the side comprising projecting chip segments (53) is even. Method according to claim 1 or 2, wherein the compression step takes place by means of hot pressing and the joining takes place while the chipboard (3) is still hot after the compression step. A method according to any one of claims 1-3, wherein the projecting clamping segment (53) of the clamping disc (3) consists of strands which are wider than the space between the strands. 532 5821 '13 A method according to any one of the preceding claims, wherein the spacer is a framework. A method according to any one of the preceding claims, wherein the furniture component is a table piece of furniture.