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1. WO2020110130 - METHOD AND APPARATUS FOR GENERATING AND PRINTING HIGH QUALITY WHITE UNDERBASE USING SCREEN PRINTING ON MEDIA HAVING COLORED BACKGROUND

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

WE CLAI M :

1 . A printing apparatus, which is configured from one of the following i) a combination of digital printer and a screen printer;

ii) a screen printer; and

iii) a screen/plate less digital printer employing virtual screens;

wherein the apparatus employing more than one screen to print white underbase where one or more diluted white ink screen is used.

2. A method to split a given white underbase into a corresponding white base and diluted white ink value/ coverage using an objective function while satisfying the following equation and constraint - f(Org White)base = (new white) base + ( diluted white) diiutedi . + (diluted white) diluted n

Eqn ( 1 ) ,

Where eqn 1 is subject to the constraint of having components of RHS (right hand side) of eqn 1 when expressed is terms of base white value add up to the Org White value passed to the splitting function on the LHS (left hand side) of the eqn 1 .

3. The apparatus as claimed in claim 1 , comprising

a controller to generate the base and diluted white ink separations from the given white underbase values in a method as claimed in claim 2.

4. The apparatus as claimed in claim 1 , comprising

an online or offline device to generate the printing screens (physical/virtual) using the separations generated by the controller as claimed in claim 3.

5. Articles printed with white underbase produced in a method as claimed in claim 2, using the apparatus as claimed in claim 1 or 4.