摘要:
The present invention relates to a method of tagging a substrate with a covert, spectroscopically detectable security feature, wherein a liquid treatment composition comprising at least one acid is deposited onto a substrate, which comprises at least one external surface comprising a salifiable alkaline or alkaline earth compound.
摘要:
L'invention concerne un procédé de fabrication d'une carte en matériau thermoplastique comprenant au moins une étape de lamination à chaud et sous pression d'une pluralité de couches en matériau thermoplastique caractérisé en ce que, avant l'au moins une étape de lamination à chaud et sous pression, on imprime sur au moins une couche en matériau thermoplastique, au moins un motif thermochromique avec une composition d'encre thermochromique comprenant dans un milieu liquide, dit solvant, ledit solvant étant aprotique, une dispersion de microcapsules thermochromiques incorporant au moins un leuco-colorant, et un liant thermoplastique choisi dans le groupe formé des polyesters polyacryliques, des polyuréthanes, et de leurs copolymères. L'invention s'étend à une telle carte incorporant au moins un motif thermochromique réalisé avec une telle composition d'encre thermochromique.
摘要:
The invention relates to a multilayered protected composition, in particular to multilayered paper products having special properties which protect securities or valuable documents from counterfeit. The multilayered protected composition is formed with an additional multilayered element, which is formed on the surface of paper and includes a multicolor coating in the form of a periodic raster made by at least two inks of different colors which are contrasted relative to the surface of the paper and lie outside of the range of the color coverage of the CMYK system. The inks comprise luminescent compounds having daytime luminescence in the visible spectrum of light under the natural light. Combinations of inks are such that the cumulative color of the additional protection element is perceived visually as being unsaturated and close to achromatic. The multilayered protection element can form a graphical figure or be part of a figure which changes its visual image by virtue of changing its color gamut, optical density and/or saturation when a document is copied on a printer operating using CMYK color system.
摘要:
There is described a substrate (S) for security documents, such as banknotes, comprising one or more paper layers (11, 12) and a polymer layer (20) which is made to adhere to a side of at least one of the paper layers (11, 12), which polymer layer (20) is substantially transparent in at least one region of the substrate (S) which is not covered by the paper layer or layers (11, 12) so as to form a substantially transparent window (W) in the substrate (S) which is formed and closed by the polymer layer (20). The polymer layer (20) exhibits in the region of the window (W) a thickness (T) which is greater than a thickness (t) of the polymer layer (20) outside of the region of the window (W). The thickness (T) of the polymer layer (20) in the region of the window (W) is substantially equal to the added thickness of the paper layer or layers (11, 12) and of the polymer layer (20) outside of the region of the window (W) so that the substrate (S) exhibits a substantially uniform and constant thickness (T). The substrate (S) further comprises a micro-optical structure (30), in particular a lens structure, which is disposed in the region of the window (W) on at least one side of the polymer layer (20).
摘要:
The invention relates to the production of an optically detectable marking on a substrate. In the method, a substrate is taken, a printing ink containing a starch derivative in a solution form is printed on at least a selected first area and at least a selected second area is left unprinted, the printing ink is allowed to dry, in such a way that the starch derivative form a thermoplastic film in the said first area on the surface of the substrate, and an optically detectable marking is hot-pressed into the film. The invention also relates to a corresponding product. With the aid of the invention hot-pressable diffractive embossing is created at low temperatures, for example, on paper or board.
摘要:
A sheet includes a pulp fiber and a linear magnetic material. The linear magnetic material has a substantially large Barkhausen effect. The linear magnetic material also has irregularities at an outer periphery of the linear magnetic material. The sheet in which the magnetic material is inhibited from being exposed at both surfaces of the sheet can be provided.
摘要:
A translucent area (Z2) is formed in the element (14) by applying a substance (24) that transparentizes its substrate (12). Thus, the method includes a step of applying a substance (20) that impermeabilizes the substrate (12) over a first area (Z1) on a first side (F1) of the substrate, surrounding a second area (Z2) devoid of the impermeabilizing substance (20). The impermeabilizing substance (20) prevents impregnation of the substrate (12) by the transparentizing substance (24) in the first area (Z1). The method then includes a step of applying the transparentizing substance (24) to at least the second area (Z2) so as to impregnate the substrate (12) in order to make it translucent in this area (Z2). The first (Z1) and second (Z2) areas form first (18) and second (22) patterns respectively, making up an image that can be observed from both sides (F1, F2) of the substrate (12).
摘要:
Film material utilizing a regular two dimensional array of non-cylindrical lenses to enlarge micro-images, and to form a synthetically magnified image through a multiplicity of individual lens/micro-image image systems, wherein a micro-image plane is provided beneath the lenses, and an optical spacer separates the lenses and the micro-image plane from a reflective layer.