Method for applying chemical watermarks on substrate
First Claim
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1. A method for applying a chemical watermark on a substrate, comprising the steps of:
- supplying a digital printer with an ink comprising a translucentizing agent;
inserting a substrate in the digital printer; and
operating the digital printer to apply said ink to said substrate.
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Abstract
A method and an apparatus for applying chemical watermarks to a substrate, e.g., paper, using a digital printer which prints ink in a dot matrix pattern. The ink may contain either a translucentizing agent or an opacifying agent. The printer is digitally controlled to print ink in accordance with a computer program corresponding to a desired pattern or image.
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Citations
30 Claims
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1. A method for applying a chemical watermark on a substrate, comprising the steps of:
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supplying a digital printer with an ink comprising a translucentizing agent;
inserting a substrate in the digital printer; and
operating the digital printer to apply said ink to said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for applying a chemical watermark on a substrate, comprising the steps of:
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supplying a digital printer with an ink comprising an opacifying agent;
inserting a substrate in the digital printer; and
operating the digital printer to apply said ink to said substrate. - View Dependent Claims (23, 24)
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- 25. A method for applying a chemical watermark on a substrate, comprising the step of digitally applying an ink comprising a chemical agent on a substrate at locations corresponding to a desired watermark, said chemical agent having the property of changing the translucence of said substrate at said locations.
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30. A method for applying a chemical watermark on a substrate, comprising the steps of:
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supplying a digital printer with an ink comprising a translucentizing or opacifying agent;
operating the digital printer to apply said ink to a transfer surface; and
bringing a substrate into contact with said transfer surface.
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Specification