Moisture proof set of floorboards and flooring

AREA OF INVENTION

The present invention relates to a set of moisture proof floorboards and flooring with a resilient surface layer comprising a decorative groove and/or a sealing means .

BACKGROUND OF INVENTION

In particular, yet not in a restrictive manner, the invention concerns a floorboard comprising a mechanical locking system, formed at least at two opposite edges and a resilient surface layer provided with a decorative groove. The following description of prior-art technique, problems of known systems and objects and features of the invention will above all, as a non-restrictive example, be aimed as the field of the application. It should be emphasised that the invention can -be used in any floorboard and it could be combined with all types of known locking system, where the floorboards are intended to be joined using a mechanical locking system connecting the panels in the horizontal and vertical directions on at least two adjacent sides.

It is known that a floorboard with a resilient surface layer can be provided with a decorative joint portion, in the form of a bevel, for example as described in WO 03/012224.

SUMMARY OF THE INVENTION

The floorboards with a resilient surface layer with a decorative j oint portion known up to now have -several

disadvantages. It is only possible to provide the edge with a bevel, which is smaller than the thickness of the resilient surface layer. If the bevel is made larger, the bevel extends down to the moisture sensitive core. .The resilient layer is normally thin, and therefore it is only- possible to produce small bevels, which are barely visible. Another disadvantage is that both joined and adjacent edges of two floorboards have to be provided with the bevel, in order to look attractive and to increase the total -width of the decorative joint portion. Known joints between two floorboards with a resilient surface layer also have the problem of penetration of moisture into the joint, which destroys the moisture sensitive core or sub-floor- The problem increases if the floorboards at the joint is provided with bevels, due to accumulating of dirt and moisture at the bottom of the V-shaped grove, formed by the two adjacent bevels, and a remaining thin barrier part of resilient material.

The present invention aims a moisture proof flooring and a set of moisture- proof floorboards with a resilient surface layer comprising a decorative groove, which provides for new embodiments offering respective advantages. A useful area for the floorboards are public flooring, e.g. in stores, restaurants, ships, hotels airports, or at home in rooms which are heavily exposed to dirt and therefore often cleaned by mopping. Another useful area is wet-rooms. By moisture proof floorboard means that the front face of the floorboard is provided with a moisture proof material and that connecting means and edges of the floorboard is configured to obtain a joint between

the floorboard and another adjacent floorboard which is moisture proof.

According to a first aspect, the invention provides a set of moisture proof floorboards, comprising a front face a rear face, a core, connecting means arranged at least at two opposite edges for connecting the floorboard with a similar floorboard, a resilient surface layer at the front face, preferably of rubber or plastic. The resilient surface layer comprises a decorative groove at an edge of the floorboard-. The bottom- σf the- decorative groove is essentially flat and parallel to the front face.

A first advantage consists in that there is no limitation of the width of the decorative groove. Even a large decorative groove is watertight and protects the core or the sub-floor. A second advantage is that only half the amount of edges has to be worked, since it is possible to replace two narrow grooves with one wide.

Preferably the edge with the decorative groove being provided in the resilient layer with a sealing means configured to cooperate with another sealing means in the resilient layer at an edge of another adjacent floorboard, to obtain a sealing. In one embodiment the sealing means comprises a horizontally extending protrusion and the other sealing means comprises a sideways open groove. In the most preferred embodiment one or both of the sealing means are provided with a sealing agent.

In another preferred embodiment both of the sealing means each comprises a sideways open groove provided with a sealing agent.

Preferably, the connecting means consist in a mechanical locking system formed at least at two opposite edges of the floorboard, which facilitates the joining of a similar floorboard. Mechanical locking system joined by angling are for instance known from WO 94/26999, which is especially advantageous at the long sides of a rectangular floor, and another locking system especially advantageous at the short sides, particularly when combined with an angling locking system like the one descibed in WO 94/26999, are described in PCT/SE2005/001586, owner Valinge Innovation AB. Other shapes of floorboards are also possible. The above mentioned combination of locking systems make it possible to join floorpanels by several methods preferably with a single action method, where the long edge is installed with angling and the short edge, which is provided with a flexible tongue, with vertical folding. This combination is also very easy to disassemble. Other mechanical locking system are also known, and possible tσ rrse, which are joined by Arrgiiπg-Angliπg-, Angling-Snapping or Snapping-Snapping. Floorboards with a mechnical locking system are generally laid floating, i.e. without gluing., on an existing .subfloor .

Evidently it is also possible to use a tongue and a groove joint, usually combined with gluing or nailing or other fastening means.

According to an embodiment of the first aspect -the wood based core is made of MDF or HDF, preferably of the thickness 6-9 mm. The thickness of the resilient surface layer is preferably 1-3 mm.

According to an embodiment the resilient surface layer comprising three layers, a transparent wear layer at the top, a decorative intermediate layer and reinforcement layer closest to the core. It is also possible to print the pattern directly at the rear side of the transparent wear layer or at the top of the reinforcement layer. Preferably, the decorative groove is only in the transparent layer and optionally coloured, but it is also possible to extend the groove down to the decorative layer or the reinforcement layer. Different colours of the layers create a visual effect by extending the groove down to another layers and no colouring is needed. Another embodiment is a resilient layer comprising only a transparent layer and a reinforcement layer of a coloured plastic or a cork layer. An alternat±ve is that the decorative layer is a wood veneer or a cork layer or that the resilient surface layer has two layers, a transparent wear layer and reinforcement layer of cork.

According to a second aspect, the invention provides a set of moisture proof floorboards, comprising a front face a rear face, a core, connecting means -arranged at least at two opposite edges for connecting the floorboard with a similar floorboard, a resilient surface layer at the front face, preferably of rubber or plastic. A moisture proof flOorboard being provided at an edge and in the resilient layer with a sealing means configured to cooperate with a another searl±ng means in the resilient layer at arr edge of another adjacent floorboard, to obtain a sealing.

Preferably the sealing means comprises a horizontally extending protrusion and the other sealing means comprises

a sideways open groove. In the most preferred embodiment one or both of the sealing means are provided with an sealing agent.

In another preferred embodiment both of the sealing means each comprises a sideways open groove provided with an sealing age-rtt-

The sealing means and the sealing agent increase the resistance of moisture and water penetration into the joint and the core and the aim is to completely seal the joint.

According to a second object, the invention provides for a flooring comprising at least two of the floorboards above in the first object, joined along adjacent -edges, preferably mechanically.

In view of the above, an objective to the invention is to solve or at least reduce the problems discussed above.

In particular, an objective of this invention άs ^" to provide a flooring and floorboard comprising a resilient surface layer with a decorative groove in the resilient surface layer and that the groove is clearly visible. Further, the floorboard is moisture proof and shows great acoustic properties.

All references to "a/an/the [element, device, component, means, step, etc]" are to be interpreted openly as referring to at least one instance of said element, device, component, means, step, etc., unless explicitly stated otherwise.

BRIEF DESCRIPTION OF DRAWINGS

Figures 1 a shows a floorboard with a resilient surface- la-yeE and decorative groove known in the

Figure Ib shows a floorboard according to an embodiment of the invention

Figures 2a-d shows alternative embodiments of the inv-erttian-

Figure 3 shows three joined floorboards according to an embodiment of the invention.

Figures 4a-c show a floorboard and joined floorboards in different views according to an embodiment of the invention.

Figure 5a, 5c-6c show joined floorboards according to embodiments of the second aspect of the invention.

Figure 5b shows an embodiment of a floorboard, according to the first aspect provided with a sealing means according to the second aspect.

DETAILED DESCRIPTION OF EMBODIMENTS

As represented in figures Ib - 4, the first aspect of the invention relates to a set of moisture proof floorboards and flooring, provided with a resilient surface layer with a decorative groove.

Figure Ia show floorboards with decorative [joint portions known in the prior art and described in WO 03/012224. The floorboard 1 comprising a front face 2 and a rear face 3 extending in the direction of the horizontal plane HP a

wood-based core 5 and a resilient surface layer 4 at the front face. The resilient surface layer 4 comprising three different surface layers having different functions . The upper most layer is a transparent, hard and durable wear layer 16 of plastic material, the intermediate layer is a decorative layer 17 of plastic film and the lowest layer is a reinforcement layer 18 which is made of an elastic material and which can be both moisture-proof and soundr absorbing. The decorative layer 17 of plastic film can be replaced with decorative patterns, which are printed directly on the underside of the transparent wear layer 16 or on the upper side of the elastic reinforcement layer 18. The floorboard is provided with a mechanical locking system for locking the floorboards horizontally and vertically at its long and short edges (12a, 13a, 12b, 13b) through angling and/or snapping.

According to a first aspect of the invention, as represented in figure Ib- 4c, a floorboard 1 is concerned, to be joined with a similar floorboard 1' at adjacent joint edges at a joint plane extending in the vertical plane VP, comprising a front face 2 and a rear face 3 extending JL-n the horizontal plane HP, a core 5, a connecting means arranged at least at two opposite edges for connecting the floorboard with a similar floorboard 1' in a vertical and/or horizontal direction and a resilient surface layer 4 characterised in that at least one edge of the floorboard 1 comprising a decorative groove 6 in the resilient surface layer 4 with a bottom 7 which is essentially parallel to the front face 2. If the floorboard is rectangular, preferably only one of the long edges is provided with the decorative groove; certainly it is also possible to provide

one of the long and one of the short edges with the groove 7. Other shapes of the board are also possible, e.g. 3, 5, 6, 7 and 8 edges. The resilient surface layer comprising preferably a transparent wear layer 16 at the top, preferably of a plastic material, an intermediate decorative layer 17 and an elastic reinforcement layer 18 closest to the core 5. The decorative layer 17, preferably of a plastic film can be replaced with decorative patterns, which are printed directly on the underside of the transparent wear layer 16 or on the upper side of the elastic reinforcement layer 18. An alternative is that the decorative layer is a wood veneer or cork layer. According to the embodiment represented in figure Ib, the groove 7 is only in the transparent layer and optionally the groove is co-lσujred.

Preferably the connecting means is a mechanical locking system formed at least at two -opposite edges 12a, 13a, 12b, 13b. The shown mechanical locking system comprising a locking strip 15 with a locking element 9, a tongue 8 and a tongue groove 10. Other known mechanical locking systems for floorboards are also possible to use such as the tongue lock in figure 4a-c or the flexible tongue described in described in PCT-/SE2005/001586. The tongue may also be replaced by a displaceable tongue 8' arranged in a displacement grove 54, as shown in figure 5b to 6c, of the type disclosed in PCT/SE2005/001586 or PCT/ SE2006/001218.

There are many alternatives for the numbers of layer in the resilient layer, the material ,of the layers and into

IQ

which layer the groove extends . Some of the alternatives are- represented in figure Ib- - 2d.

The resilient surface layer 4, illustrated in figure

2a, comprising a transparent surface layer 16, an intermediate decorative layer and a reinforcement layer closest to the core. The groove 6 extends down to the reinforcement layer and is preferably coloured. If one of the layers in the resilient layer, represented in figure lb-bd is of a non water proof or moisture sensitive material, it is preferred that the groove is not extending into this layer.

The resilient surface layer 4, illustrated in figure

2b, consisting substantially of a transparent surface layer

16, and a reinforcement layer closest to- the core 18. The groove 6 extends down to the reinforcement layer, preferably of plastic and is preferably coloured.

The resilient surface layer 4 illustrated in figure 2c, consisting substantially of a transparent surface layer 16, and a reinforcement layer closest to the core 18. The groove 6 is only in the transparent layer and is preferably coloured. The reinforcement layer is preferably of a coloured plas-tic or a cork layer.

The resilient surface layer 4 in figure 2d, consisting substantially of only one layer. The groove is preferably coloured.

In figure 4b an embodiment of the invention is represented, comprising a rectangular floorboard 1 with a mechanical locking system at long 13a, 13b and short edges 12a, 12b

and a decorative groove 6 along only one of the long edges and along only one of the short edges. Additional grooves 41 in the resilient surface layer, between the short edges, are provided. Figure 4a is a cross section of the floorboard in figure 6b, perpendicular to the long edges, joined to similar floorboards 1' and 1' ' . Figure 4c is a cross section of the floorboard in figure 4b, perpendicular to the short edges, joined to similar floorboards 1' and 1" .

The wood-based core material is preferably a particle, MDF, HD-F or plywood board.

As non-limiting examples of materials that can be used in a resilient surface layer are -acrylic plastic-based materials, elastomer of synthetic rubber, urethane rubber, silicone rubber or the like, polyurethane-based hot-melt adhesive, PVC or polyethylene.

The decorative groove is made by chemical or mechanical working, preferably cutting or grinding. It is also- possible to colour tfie groove ^" . Iϊ ^{~ "} grinding is uπed it is possible to make a very shallow groove or even just change the roughness and the brightness of the surface. T±i-e grinding method is applicable also to a laminate flooring with a surface layer of resin-impregnated sheets . Another technique is to cut of a part of the resilient surface layer, or cut it to the desirable shape before attaching it to the core, and replace it wit another resilient layer of different colour or structure.

A second aspect of the invention, as illustrated in figure 5a-6c, is a set of essentially identical moisture proof floorboards 1 each comprising a sealing means at an edge . Each floorboard comprising a front face 2 and a rear face (3) extending in the horizontal plane HP, a core 5, a connecting means 8, 9, 10, 11, 15, 8', 54 arranged at least at two opposite edges for connecting a floorboard with a another floorboard 1' in a vertical and/or horizontal direction and a resilient surface layer 4. A moisture proof floorboard being provided at an edge and in the resilient layer 4 with a sealing means 51 configured to cooperate with another sealing means 52 in the resilient layer at an edge of another adjacent floorboard, to obtain a sealing.

The sealing means may comprise a horizontally extending protrusion and the other sealing means may comprise a sideways open groove, as shown in figure 5a. In the most preferred embodiment one or both of the sealing mea-as- are -p-rov-ided with- a sea-ling agent S3-.

In another embodiment, shown in figure 6a, both thp sealing means 51, 52 comprise a sideways open groove provided with a sealing agent 53.

In figure 5c an embodiment of the sealing means is illustrated comprising overlapping edges, preferably- provided with a hook shaped connection 51, 52. A sealing agent 53 may also be comprised.

The sealing agent may comprise wax, grease, oil or bitumen. A preferred sealing agent comprises a mix of paraffin wax and paraffin oil. Another example is a micrp wax and a natural or synthetic rubber strip.

In figure 6b an embodiment of the sealing means is illustrated comprising an expandable sealing agent 53', arranged at a sideways open groove 51 in the resilient layer 4. The sealing agent is configured to expand into a sideways open groove 52 in the resilient layer of an adjacent floor panel, as illustrated in figure 6c, after that the two panels are connected to each other by the connecting means . An example of an expandable sealing agent 53' is a strip, preferably of polyurethane, provided with tape, which is removed just before the connection of the two adjacent floorboards. Other examples are materials, which expand when exposed to moisture.

The first aspect of the invention, comprising a decorative groove 7, may be combined with the second aspect, comprising sealing means 51, 52, as illustrated in 5b.

A second object of the invention, represented by- figure 3 and 4, is a flooring comprising a set of the floorboards 1, 1', according to the first and/or second aspect, joined along adjacent edges, preferably mechanically.

In the most preferred embodiment, only one of the edges 12a, 13a, 12b, 13b of the two joined and adjacent edges is provided with the decorative groove .

The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the- appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein.