Panel for forming a floor covering, method for manufacturing such panels and granulate applied herewith

Abstract

A method for manufacturing panels with at least a substrate and a top layer. The method having the steps of providing a granulate having thermoplastic material and having an average particle size of less than 1 millimeter, forming a substrate layer by strewing the granulate, consolidating the layer between the belts of a continuous press device, and providing the top layer on the substrate.

Claims

1. A method for manufacturing panels with at least a substrate and a top layer; said substrate comprising one or more substrate layers and said top layer comprising a printed decor; said method at least comprising: providing thermoplastic material in the form of a granulate, said granulate having an average particle size of less than 1 millimeter; forming a substrate layer by strewing said granulate; consolidating said layer between the belts of a continuous press device; providing said top layer on said substrate.

2. The method of claim 1, wherein said average particle size is larger than 25 micrometers.

3. The method of claim 1, wherein said granulate further comprises at least 50 percent by weight of fillers.

4. The method of claim 1, wherein said providing a granulate comprises breaking down larger particles.

5. The method of claim 1, wherein said providing a granulate comprises solidifying thermoplastic material by quenching in a liquid.

6. The method of claim 1, wherein said thermoplastic material is soft PVC.

7. The method of claim 1, wherein said providing said top layer comprises melting said substrate layer at least at the surface together with at least a decor film comprising said printed decor.

8. The method of claim 1, wherein said strewing comprises depositing said granulate on the belts of said continuous pressing device.

9. The method of claim 1, wherein said method further comprises levelling said substrate by means of a plastisol.

10. The method of claim 1, wherein said method further comprises levelling said substrate by grinding.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) With the intention of better showing the characteristics of the invention, hereafter, as an example without any limitative character, some preferred embodiments are described, with reference to the accompanying drawings, wherein:

(2) FIG. 1 represents a panel with the characteristics of the invention;

(3) FIG. 2, at a larger scale, represents a cross-section according to lines II-II in FIG. 1;

(4) FIG. 3 schematically represents some steps in a method with the characteristics of the second aspect.

DETAILED DESCRIPTION OF THE INVENTION

(5) FIG. 1 represents a rectangular and oblong floor panel 1 with a pair of long sides 2-3 and a pair of short sides 4-5.

(6) FIG. 2 represents that the respective floor panel 1 is composed of various layers 6-7-8-9-10.

(7) The substrate 11 is formed by a layer 9 of thermoplastic material, in this case soft PVC, which comprises individual fibers, such as glass fibers. The respective substrate layer 9 further comprises an embedded glass fiber fleece 12. Above the respective layer 9, a top layer 13 is provided, which as such comprises a printed decor film 7 and a transparent wear layer 6 on the basis of thermoplastic material. The top layer 13 further also comprises a backing layer 8 located underneath the decor film 7. In the example, the backing layer 8, the decor film 7 and the wear layer 6 are made on the basis of polyvinyl chloride. Preferably, the decor film 7 is made as a printed hard PVC film, whereas the wear layer 6 and possibly the optional backing layer 8 preferably are realized on the basis of soft PVC, namely with an amount of plasticizer of 12 percent by weight or more.

(8) In the example, the decor film 7 is provided with a print with a wood pattern 14, wherein, per panel 1, each time the image of a single wooden board is provided.

(9) On the lower side 15 of the substrate 11, a counter layer 10 is provided, which is also based on soft PVC.

(10) FIG. 2 represents that the layer 9 comprising the fibers is present at least in the middle of the thickness T of the substrate 11. In this case, the respective layer 9 forms the entire substrate 11.

(11) FIG. 2 further also represents that the respective layer 9 comprising the individual fibers constitutes at least 40 percent and here even more than one half of the thickness T of the panel 1.

(12) Further, the panel 1 of the example is provided with mechanical coupling means or coupling parts 16 on both opposite edges 2-3. FIG. 2 shows that at least the mechanical coupling means 16 on the long pair of edges 2-3 allow that two of such floor panels 1 can be coupled to each other in such a manner that a locking is created in a vertical direction V1 perpendicular to the plane of the coupled panels 1, as well as in a horizontal direction H1 perpendicular to the coupled edges 2-3 and in the plane of the panels 1. The illustrated coupling means 16 show the characteristic that they are substantially realized as a tongue 17 and a groove 18 bordered by an upper lip 19 and a lower lip 20, wherein said tongue 17 and groove 18 substantially are responsible for the locking in said vertical direction V1, and wherein the tongue 17 and the groove 18 are provided with additional locking parts 21-22 substantially responsible for the locking in said horizontal direction H1. In this case, the locking parts comprise a protrusion 21 on the lower side of the tongue 17 and a cooperating-therewith recess 22 in the lower lip 20.

(13) The coupling means 16 represented here allow at least a coupling by means of a turning movement W along the respective edges 2-3.

(14) The mechanical coupling means 16 are substantially realized in the layer 9, which, according to the invention, comprises the individual fibers. In the example, they are provided by means of a milling treatment, for example, by means of rotating tools.

(15) FIG. 3 represents some steps of a method for manufacturing the panel of FIGS. 1 and 2. More particularly, the step is represented of forming the layer 9 with thermoplastic material, which, according to the invention, comprises the individual fibers.

(16) In the example of FIG. 3, the respective layer 9 is formed on the basis of a granulate 23 of the respective thermoplastic material. Herein, this relates to a granulate 23 with the characteristics of the third aspect, wherein the granules also comprise glass fibers.

(17) FIG. 3 represents that the granulate 23 initially is deposited on a transport device 25 by means of a strewing device 24, after which it is consolidated between the belts 26 of a continuous pressing device 17. Herein, the granulate 23 is transported along one or more heating devices 28 and possibly it can be cooled again after the press treatment or at the end of the press treatment. By cooling, it is achieved that the pressed plates, sheets or layers relatively fast are manageable for further processing.

(18) FIG. 3 further also represents that simultaneously with pressing, a further layer, in this case the glass fiber layer 12, can be applied or inserted by providing it on or between the granulate 23 in the press treatment. This may relate, for example, as aforementioned, to a glass fiber layer 12 or to a backing layer 8, a decor film 7 or a wear layer 6. It may also relate to a composition of layers already laminated together, such as an already entirely or partially composed top layer 3, which, for example, comprises at least a decor film 7 and a wear layer 6, or at least a backing layer 8 and a decor film 7; or the backing layer 8, decor film 7 as well as the wear layer 6. A possible superficial lacquer layer preferably is provided after the press treatment. This is not represented here. According to another, not represented possibility, at least a decor film 7 or a wear layer 6, or possibly a combination of both, is provided after the granulate 23 already has been pressed at least partially, preferably already has been pressed at least to a coherent whole. In this last case, the already pressed layer on the basis of granulate preferably is ground before the remaining layers 6-7 are provided thereon. For providing the decor film 7 and/or the wear layer 6, preferably again use is made of a continuous pressing device. Instead of a grinding treatment, it is also possible to work with levelling, for example, by means of a plastisol.

(19) The present invention is in no way limited to the herein above-described embodiments; on the contrary, such panels, methods and granulates can be realized according to various variants, without leaving the scope of the present invention. Moreover, the panels, instead of as floor panels, can also be realized as wall panels or ceiling panels or even as furniture panels.