Halftone printing plates containing microscopic perforations and methods for producing same
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United States of America Patent
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Mar 11, 2003
Grant Date -
N/A
app pub date -
Jul 8, 1999
filing date -
Jul 16, 1998
priority date (Note) -
Expired
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Abstract
A computer implemented method to include microscopic perforations (perforations) in an printing plate is revealed. The particles improve the properties of the plate towards printability of an image on different kinds of offset presses. The perforations are formed by perforations which are added in a fully digital way. Aspects of the invention include of three alternative embodiments for include the repelling particles, and these alternative embodiments may be uses alone or in combination depending on the user's preferred workflow. The third alternative embodiment adds the perforations through an additional layer in the page description, this layer comprising a pattern which erases small particles in the original design elements. The first alternative embodiment adds the perforations through a modified screening method. The second alternative embodiment includes perforations into existing bitmaps.
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