Alignment of paste-like ink having magnetic particles therein, and the printing of optical effects
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United States of America Patent
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Jul 3, 2012
Grant Date -
Apr 20, 2006
app pub date -
Oct 18, 2005
filing date -
Jul 15, 2002
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Abstract
A method and apparatus is provided for printing using paste like inks such as those used in intaglio printing, wherein the inks include specialty flakes such as thin film optically variable flakes, or diffractive flakes. The invention discloses an apparatus having an energy source such as a heat source for temporarily lessening the viscosity of the ink during alignment of the flakes within the ink.
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