WO2006112775A1

WO2006112775A1 - Floor sheet provided with a resilient glue layer and a method to produce such a floor sheet

Info

Publication number: WO2006112775A1
Application number: PCT/SE2006/000446
Authority: WO
Inventors: Hans BRÄNNSTRÖM; Lars Eriksson
Original assignee: Ab Gustaf Kähr
Priority date: 2005-04-18
Filing date: 2006-04-17
Publication date: 2006-10-26
Also published as: SE0500854L

Abstract

The present invention refers to a floor sheet (1) preferably a parquet floor (2) or a laminate floor/veneer floor having different layers (3) of sheet material (4) provided one upon the other. Between at least two of said layers (3) a glue (5) is provided for gluing together these layers (3), said glue (5) having resilient qualities in providing of at least one sound insulating quality in said floor sheet (1) such as e.g. decreased sound pass through, decreased frame work sound and/or in providing of decreased hardness in said floor sheet (1) in the form of a somewhat softer floor sheet (1) to walk on.

Description

Floor sheet provided with a resilient glue layer and a method to produce such a floor sheet.

The present invention relates to a floor sheet, preferably a parquet floor having different layers of sheet material placed one upon another in providing a sound insulating quality in said floor sheet, whereby between at least two of said layers a glue is provided for gluing together these layers, said glue having extensible qualities in providing of a decreased hardness in said floor sheet

Existing structures on the market today use rigid, non flexible floor sheets such as lamina floor/laminate floor/veneer floor where different sheet material such as wearing layer, core and bottom sheets are glued against each other in different layers into a rigid and non flexible floor sheet, which is hard to walk on and which causes walking sounds and sound passing through into the frame work in a building, when a person is walking on the same, which is disturbing for the hearing in the form of a high sound level, which often in that case is over the accepted sound requirements in the form of sound classes A, B, C, which are required in a building. Rigid and non resilient floor sheets thus create unnecessary load on the human body, when the rigid floors is entered upon. It is. known before that this problem has been tried to solved in the way that in the floor sheet use a layer of resilient sheet material of rubber or cork in order to decrease the stiffness in the floor sheet. This requires however that these sheet materials must be glued on their both glue surfaces, which in turn requires an expensive manufacturing process at the same time as cost arises for the sheet material and the two glue layers. It is also known before to glue on the underside of floor sheet a resilient sheet material. This does not make any greater use since the floor sheet in itself still is rigid and non resilient

One object of the present invention is to solve those problems existing in the structures mentioned above by replacing the resilient floor sheet by a resilient glue layer.

Thanks to the present invention a resilient glue has been provided, which is decreasing its stiffness and non flexible qualities without using expensive resilient sheet materials having double glue layers. According to the invention the floor sheet in the form of a parquet floor or a laminate floor/veneer floor comprises different layers of sheet materials provided one upon the other. Between at least two of these layers a glue is provided having resilient qualities in providing a decreased stiffness and non flexible qualities in the sheet materials and also different sound insulating qualities in the floor sheet such as e.g. decreased sound passing through, decreased step sound, decreased frame work sound or in providing of a decreased stiffness in the form of a somewhat softer floor sheet to walk upon. In a preferable embodiment example according to the present invention the resilient glue also comprises spring back qualities and adheres between the layers against two opposite glue surfaces. The resilient qualities make that the sheet materials can move somewhat relative each other, so that these are prevented to come into a self oscillation, when they are subjected for sound waves or in the case some person walks on said floor sheet. In a parquet floor of wood there is a core, which consists of rods placed next to each other and in this way constitutes a layer. At the top there is a wearing layer and the lower most part of the floor a bottom layer is located. According to the invention the resilient glue in a parquet floor is arranged preferable between the bottom layer and the core. The resilient glue can according to the invention consist of a thermoplastic melt glue or a thermo setting glue or a so called two component glue. The thermo setting glue is setting on chemical way by aid of at least one added chemical substance or by aid of an infra radiation or UV-light of ultra sound or other wave motion. The resilient glue can according to the invention be applied to the glue surface using different methods such as by applying by aid of rollers, extrusion, rolling, string spreading, laminating. By extrusion a nozzle is used through which the glue is sprayed to a string on the glue surface by aid of e.g. a robot The nozzle or the floor sheet is in motion relative each other, so that the string form a predetermined pattern over a predetermined area of the glue surface. A pattern saves very much glue compared with a whole glue layer. According to the invention the floor sheet with the resilient glue can be arranged in a so called "click-floor", which has a form for connection in its edges, of the type "male and female parts" for lying of the floor sheets against each other. Since the resilient glue does not influence this joining together principle, the invention can with advantage also be used on this "click-floor". The greatest advantages with the invention is thus to provide a floor sheet having less stiffness and rigid and which in this way has good noise damping qualities. The material cost is lowered since only one layer of resilient glue is needed, arranged like a pattern with a string in stead of one layer of rubber like sheet unit plus two layers with four glue surfaces. This makes also the production easier and cheaper without influencing the "click-floor-function" negative.

The invention will now be described in more detail below with help of some preferred embodiment examples with reference to the accompanying drawings, on which Figure 1 shows a cross section through a parquet floor, and

Figure 2 shows a perspective view of a glue surface where a glue is arranged in a pattern on a sheet material.

As can be seen from fig. 1, here is shown a floor sheet 1 in the form of a parquet floor 2, which comprises different layers 3 of sheet material 4 arranged one upon the other. Between two of said layers 3 an elastic glue 5 is provided for gluing together said layers 3. The parquet floor 2 has a wearing layer 6, a core 7 consisting of rods 8 placed next to each other, thus forming a layer 3. At the lowest place there is provided a bottom layer 9.

As can be seen from fig. 2, here is illustrated that the sheet material 4 comprises a glue surface 10, where the glue 5 is applied. The resilient glue 5 is applied on the glue surface 10 by extruding of said glue 5 by a nozzle 12 out on the glue surface 10 by aid of e.g. a robot in the form of a string 11 on the glue surface 10, so that the nozzle 12 or the floor sheet 1 being in motion relative each other, so that the strings 11 form a pattern 13 over a predetermined part of said glue surface 10. On said glue 5 then next layer 3 of sheet material 4 with its gluing surface 10 turned downwards against the glue 5 is placed, whereupon said glue is setting.

Claims

1. A floor sheet (1) consisting of a parquet floor (2) or a laminate floor/veneer floor comprising different layers (3) of sheet material (4) provided one upon the other, characterized in that between at least two of said layers (3) a glue (S) is provided for gluing together these layers (3), said glue (5) having resilient qualities in providing of at least one sound insulating quality in said floor sheet (1) such as e.g. decreased sound pass through, decreased frame work sound and/or in providing of decreased hardness in said floor sheet (1) in the form of a somewhat softer floor sheet (1) to walk upoa

2. A floor sheet according to claim 1, characterized in that the sheet material (4) has at least one glue surface (10) where the glue (5) is adhering between the layers (3) against at least two opposite glue surfaces (10), whereby the resilient qualities make that the sheet materials (4) can move somewhat relative to each other, these being prevented to start a self oscillation when they are subjected to sound waves or when somebody walks on the floor sheet (1).

3. A floor sheet according to claim 1, characterized in that said glue (5) at least to some extent also has spring back qualities.

4. A floor sheet according to claim 1, characterized in that said floor sheet (1) comprises a wearing layer (6), at least one core (7) of at least one layer (3) and at least one bottom layer (9), whereby said glue (5) is provided between at least two layers (3) somewhere between said wearing layer (6) and said bottom layer (9).

5. A floor sheet according to claim 4, characterized in that the core (7) of the parquet floor (2) consists of rods (8) placed close to and/or above each other and which in that way constitute at least one layer (3).

6. A floor sheet according to claim 1, characterized in that the glue (5) is a thermo plastic melt glue and/or a thermo setting glue and/or a so called two component glue.

7. A floor sheet according to claim 6, characterized in that the theπno setting glue is setting in a chemical way by aid of at least one added chemical substance or is setting owing to added heat, infra radiation UV-light or ultra sound or other wave motion.

8. A method in providing a floor sheet (1) according to claim 1 or 2, characterized in that said glue (5) is applied on the glue surface (10) by at least some of the following methods such as by roll coating, extruding, rolling, extrusion, laminating.

9. A method according to claim 8, characterized in that the extruding of the glue (5) is made by at least one nozzle (12) by aid of e.g. a robot, so that at least one string (11) is formed on the glue surface (10), whereby the nozzle (12) and/or the the floor sheet (1) is moving relative each other and at least one string (11) creates a pattern (13) over at least a part of the glue surface (10), whereby on top of the glue (5) having the pattern (13) then the next layer (3) of sheet material (4) with its glue surface (10) turned downwards against the glue (5) is placed, whereupon said glue (5) is setting/solidifying to a desired extensible quality.

10. A floor sheet according to claim 1, characterized in that the same consists of a so called "click floor", which is fixed together by a locking function, which having slots for connection in its edges, of the type "male and female parts" during the mounting of the floor sheets.(l).