Patent Application
20050144898
1. Field of the Invention
The present invention relates to the process for manufacturing a set of decorative panels provided with a decor which is matching over two opposite edges of the panels when the panels are arranged in a predetermined order.
2. Description of Related Prior Art
Panels coated with thermosetting laminates have been present on the market for some time now. They are foremost used where the demand for abrasion resistance is high, but also where resistance towards different chemicals and moisture is required. As an example of such products floors, floor beadings, table tops, work tops and wall panels can be mentioned.
The thermosetting laminate mostly consists of a base layer with a decor sheet placed closest to the surface. The decor sheet can be provided with a desired decor or pattern. The most frequent patterns usually represent the image of different kinds of wood, or minerals such as marble or granite. The surface of the laminate can be provided with a structure during the laminating procedure which will make the decor more realistic. Press plates with structure or structure foils are frequently used when manufacturing such a laminate. A negative reproduction of the structure in the press plate or the foil will be imprinted into the laminate during the laminating procedure.
One panel format which is rather common on the market is approximately 1.2×0.2 m. This format, and formats close to this, have the advantage that a package of a number of such panels is easy to handle and will be possible to transport in most cars. The format is still large enough to reduce the time used for installation of the panels. Formats much larger would be difficult to transport and formats much smaller would consume more time during installation.
As said earlier, the decor of these panels most often depicts products like wood and minerals. The wood decor may for example be constituted by a number of wood blocks arranged in parallel rows on each panel. Popular designs show two and three parallel rows of such blocks on each panel. It is important to design the decor so that the panels will give a continuos impression when installed. The design of parallel row wood block pattern can be designed as shown in WO 9301378 and the result on an installed floor will make the short side edges more or less disappear.
The decor of these panels are most often printed on a continuous web by means of one or more printing cylinders. It is understood that these printing cylinders have a repetition frequency which is depending on the diameter, or actually the circumference of the cylinder. The cost of such a cylinder is of course depending on the size i.e. diameter of the cylinder. A longer repetition distance will also add problems with format change of the decor. The format of the decor is caused by the different treatments the decor web is subjected to such as the printing itself, changes in moisture and temperature, impregnation, curing and the laminating process.
Another popular decor is when each panel depicts a wood plank or in other words that the panel have a decor which gives the impression that it is a single piece of solid wood. This makes it different from the blocked wood design described above. Here the length of 1.2 metre or so, seems a bit short and it wood be more pleasing to the eye to have a panel length of 2 metres or more. However, this would give other problems like the transportability, the printing cost and the decor matching discussed above.
It has for a long time been a great need to be able to manufacture a decorative thermosetting laminate with a decor pattern with a surface structure as life like as the decor reproduced.
According to the present invention the above mentioned needs have been met and a decorative board with a decorative surface with a matching decor that overlaps the joints of adjacent boards has been achieved. The invention relates to a process for the manufacturing of panels having a decorative surface. The decor of the panels is achieved by means of printing a plurality of different decor sections on a web, each decor section being intended to constitute the decor of a panel, each decor further having a beginning and an end. The invention is characterised in that at least the end of a first decor section is made to match the beginning of a second decor section so that when the first decor section and the second decor section is arranged in a row, the decor of the first section will give the impression of continuing on the second decor section.
It is advantageous to provide the decorative surface with a pattern in predetermined fixed positions on at least the first and the second edges. The first edge pattern positions and the second edge pattern positions are then matched so that the pattern continues over the first and second edges of adjacent panels. As discussed earlier there are problems with change in format of the decor due to the treatment the decor is subjected to. This may cause problems with the intended matching. This may be overcome by arranging the predetermined fixed positions so that it extends over a matching tolerance distance. How to achieve this is further described in connection to enclosed figures.
The matching tolerance distance is in preferred embodiment suitably in the range 1-20 mm. It might however be possible to use a matching tolerance distance in the range 1-10 mm or even in the range 1-5 mm, much depending on well controlled the format changes of the decor is.
The plurality of decor sections are suitably arranged parallel to each other on the web. According to one embodiment of the invention the first decor section matches the beginning of the second decor section, an end of the second decor section matching a beginning of a third decor section and so on. An end of a final decor section then matches a beginning of the first decor section. This implies that the impression of an infinite wood plank can be achieved. However, as discussed earlier in the present invention the decor is most often achieved by means of a printing cylinder having a circumference corresponding to the length of a panel+machining tolerances this will mean an effective decor length of 1.2 m for each decor section. It is common to have 6 such decor sections arranged next to each other on the printing cylinder. If the end of the first decor section is designed to match the beginning of the second decor section, the end of the second matches the beginning of the third and so on, until the sixth and last section having an end matching the beginning of the first decor section, an effective length of an assembled row of panels may have a length of 7.2 metre in the given example without any repetition of the decor pattern. It is of course also possible to have two or three different sets of such matching resulting in two different sets with each a length of 3.6 metre or three different sets with each a length of 2.4 metre without any repetition in the decor.
It is also advantageous to provide the panels with a surface structure which matches and is in register with the decor. This may be achieved by any known means of surface structuring or embossing. The surface grades used for achieving the structure pattern may be selected from the group consisting of; groups of small oblong indentations, different grades of gloss to flat surface finish, ridges and recesses and combinations thereof.
The panels achieved through means of the present invention is suitably provided with identification means so that it will be easy for the installer to arrange the panels in the desired sequence. It is also possible to pack the panels so that the stacked in sequence.
The panel may according to certain embodiment of the invention be constituted by a base layer, the decor layer as described above and a wear layer.
The invention is further explained in connection to the accompanying drawings showing different embodiments of the invention where,
Accordingly,
The invention is not limited by the shown embodiments since they can be varied in different ways within the scoop of the invention. It is for example possible to provide panels with a surface structure that matches the decor described. It is also possible to simulate the structure of other materials and match them in a way as described above. Such pattern may be fabric, minerals like polished marble or even completely fantasy based patterns. It is further possible to make other combinations of panels intended to have matching decor when joined together as for example having two panels not intended for such matching while the rest are. Also other amounts of different decor sections than the six discussed in embodiments of the present invention is of course possible to make.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0303329-7 | Dec 2003 | SE | national |
