![]() ![]() ![]() When the identification code is scannable by a smart phone. Suitable techniques for steganography and digital watermarking are disclosed in the handbook “Information hiding techniques for steganography and digital watermarking.” Edited by KATZENBEISSER, Stefan, et al. For example, the identification code can be concealed within the lowest bits of noisy images. Concealing the identification code printed with the one or more inkjet inks used for inkjet printing the one or more decorative patterns, can be accomplished by techniques well-known to skilled persons in digital image steganography, sometimes also called invisible digital watermarking. It also does not enhance the cost and complexity of the inkjet printer as no additional print heads and ink circuits have to be foreseen. By inkjet printing the identification code by the same one or more inkjets inks used for inkjet printing the one or more decorative patterns, the latter undesired effect with an invisible ink is avoided. Such an effect may also be obtained when the decorative laminates are installed as a floor in a home using special lighting conditions and are that time highly undesired. An invisible ink may become visible, for example, under an UV lamp by fluorescence. The hidden identification code is not printed by an invisible ink, but by the same one or more inkjets inks used for inkjet printing the one or more decorative patterns. Steganography encompasses the techniques for concealing an image within another image, such as here concealing the identification code in the one or more decorative patterns. In another preferred embodiment, the identification code is machine readable, but not human readable as use is made of steganography. The identification code is then used for delivery ( 23) of the ordered laminate ( 24) to the customer ( 1). The decor paper roll ( 16) is then impregnated ( 18) with a thermosetting resin and cut to a size ( 19) for being heat pressed ( 21) and finished into ready-to-use floor laminate ( 24). ![]() A print job for the laminate order ( 2) is then provided by the computer ( 5) via a digital connection ( 7) to a decor printer ( 20), which prints on a paper roll ( 12) from a paper manufacturer ( 11) using an inkjet printer ( 15) resulting in a decor paper roll ( 16) with the one or more decorative patterns from the laminate order ( 2) and the assigned identification code. On an input device ( 3) digitally connected ( 4) to a computer ( 5), a customer ( 1) defines a laminate order ( 2), which is assigned an identification code. 3 shows another embodiment of a method for manufacturing decorative laminate panels according to the invention involving no decor printer as the inkjet printing is performed at the laminate manufacturer. The identification code is used for delivery ( 23) of the ordered laminate ( 24) to the customer ( 1). The decor paper roll ( 16) is then delivered to a laminate manufacturer ( 20), who impregnates ( 18) it with a thermosetting resin and cuts to a size ( 19) for being heat pressed ( 21) and finished into ready-to-use floor laminate ( 24). A print job for the laminate order ( 2) is then provided by the computer ( 5) via a digital connection ( 6) to a decor printer ( 13), which prints on a paper roll ( 12) from a paper manufacturer ( 11) using an inkjet printer ( 15) resulting in a decor paper roll ( 16) with the one or more decorative patterns from the laminate order ( 2) and the assigned identification code. 2 shows an embodiment of a method for manufacturing decorative laminate panels according to the invention involving a décor printer and a laminate manufacturer. However, it was found that the handling of the rather fragile resin impregnated paper by an inkjet printer resulted in additional waste by the breaking-up of the paper sheet and disruption in the manufacturing of the decorative panels. By first impregnating an unprinted paper roll and cutting it to sheets, the printing of the desired decorative pattern could be delayed to very late stage in the manufacturing chain, thereby reducing stock and facilitating personalized flooring laminate. One approach to handle the above issues is explored by EP 2865527 A (AGFA GRAPHICS) which discloses a method of manufacturing a decorative surface including the steps of: a) impregnating a paper substrate with a thermosetting resin b) jetting a decorative pattern with one or more aqueous inkjet inks including a polymer latex binder on the thermosetting resin impregnated paper c) drying the one or more aqueous inkjet inks and d) heat pressing the thermosetting paper carrying the decorative pattern into a decorative surface. ![]()
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