Method for producing at least one window opening in an elongate paper substrate, and apparatus
A matrix and slender technology, applied in the direction of papermaking, paper/cardboard containers, general parts of printing machinery, etc., can solve the problem of screen accumulation and other problems, and achieve the effect of eliminating position deviation and stable shape
Active Publication Date: 2009-09-02
LEONHARD KURZ STIFTUNG & CO KG
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Problems solved by technology
In this way, the deviation of the watermark position from the standard size is basically repeated after a screen printing, but these deviations are accumulated every time the screen is newly started
Method used
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[0052] figure 1 An elongated paper substrate 1 is shown schematically subdivided into a plurality of sheet parts 10 each having a watermark 2 . The paper substrate 1 is wound on a roll 1a and drawn therefrom for further processing. The subdivision of the paper substrate 1 into a plurality of sheet parts 10 takes place virtually via dividing lines 5 situated between two adjacent sheet parts 10 . A sensor unit 3 , such as a camera system, optically detects the position of the individual watermarks 2 and their relative position therebetween on the paper substrate 1 . Since each watermark 2 is slightly different in position, shape, size and contrast, the position data detected by the sensor unit 3 are only reference values which have to be properly corrected in order to be usable as control markers for further processing steps. In particular, the spacing between the watermarks 2 and, optionally, the side spacing can also be corrected.
[0053] Due to the relatively large warp...
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Abstract
The invention relates to a method and an apparatus for producing at least one window opening (7) in an elongate paper substrate (1) which is divided virtually into paper sheet sections transversely with respect to its longitudinal axis. The method comprises the following steps: a) the paper substrate (1) is provided with at least one watermark (2) per paper sheet section; b) the position of at least one watermark (2) on the paper substrate (1) is detected by means of at least one sensor unit (3); c) the paper substrate (1) is then fed to a unit for producing openings in the paper substrate (1), which unit is actuated in such a way that at least one window opening (7) per paper sheet section is produced in the paper substrate (1) on the basis of the position of the at least one watermark (2), which position is detected by the at least one sensor unit (3).
Description
technical field [0001] The invention relates to a method and a device for carrying out the method for forming at least one viewing window opening in an elongated paper substrate, which is divided transversely to its longitudinal axis into imaginary sheet parts. Paper substrates having at least one viewing window opening are used for the production of security documents or documents of value, such as banknotes, certificates, passports, IC cards, driver's licenses and the like. The at least one viewing window opening is often covered here by a film element, for example with reflective and / or transmissive security elements, such as diffractive structures, holograms, Graphics, printed images, etc., and some optically variable substances, such as luminescent materials, photochromic or thermochromic materials, liquid crystals, interference pigments, magnetic substances, etc. Background technique [0002] WO 95 / 10420 A1 discloses a method for forming at least one viewing window o...
Claims
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IPC IPC(8): B65H35/00B65H23/04B42D15/10B31B50/83
CPCB65H23/046B65H2511/512B41F33/00B26D5/34B26D5/007B65H2701/1916B26F1/384Y10T83/0529Y10T83/145
Inventor M·格沃斯茨-考普曼G·卡卢察R·米查姆
Owner LEONHARD KURZ STIFTUNG & CO KG