Rotary printing method

Patent metadata

Field	Value
Publication number	US-10131168-B2
Application number	US-201415039283-A
Country	US
Kind code	B2
Filing date	Oct 28, 2014
Priority date	Nov 27, 2013
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The present invention relates to a rotary printing process for the application of functional coatings to a print substrate, to a coated print substrate produced by the said process, and to the use thereof, in particular in the packaging sector.

First claim

The invention claimed is:

1. A rotary printing process for the application of a coating to a print substrate ( 12 ), where cells ( 6 ) arranged on a rotating anilox roll ( 3 ) are filled with a printing ink ( 4 ) in a filling step and the printing ink ( 4 ) from the cells ( 6 ) of the anilox roll ( 3 ) subsequently wets front faces ( 13 ) of screen dots ( 10 ) in a wetting step, where the screen dots ( 10 ) have front faces ( 13 ) and lateral surfaces ( 14 ) adjacent thereto and are arranged on a flexible printing plate ( 9 ) attached to a rotating plate cylinder ( 8 ), and where, in a transfer step, the print sub-strate ( 12 ) is pressed radially against the printing plate ( 9 ) by a rotating impression cylinder ( 11 ) and the printing ink ( 4 ) is transferred to the print substrate ( 12 ), characterised in that the printing ink comprises a functional material and in that at least 50 percent of the screen dots ( 10 ) on the printing plate ( 9 ) dip into the cells ( 6 ) of the anilox roll ( 3 ) during the wetting step, where, besides the front faces ( 13 ), the lateral surfaces ( 14 ) of the screen dots ( 10 ) are also wetted with the printing ink ( 4 ).

2. A rotary printing process according to claim 1 , wherein the lateral surfaces ( 14 ) of the screen dots ( 10 ) are partly or completely wetted with the printing ink ( 4 ).

3. A rotary printing ink according to claim 1 , wherein at least 70 percent of the screen dots ( 10 ) dip into the cells ( 6 ).

4. A rotary printing process according to claim 1 , wherein the screen dots ( 10 ) have a screen dot size G and the cells ( 6 ) have a width W and the ratio G/W represents a value in the range from 0.05 to 0.80.

5. A rotary printing process according to claim 4 , characterised in that the ratio G/W represents a value in the range from 0.15 to 0.60.

6. A rotary printing process according to claim 1 , wherein the printing plate and the anilox roll each have a line count in the range from 34 lines/cm to 60 lines/cm.

7. A rotary printing process according to claim 1 , wherein the printing plate is provided with screen dots over its entire surface.

8. A rotary printing process according to claim 1 , wherein the print substrate is a cellulose-containing material.

9. A rotary printing process according to claim 8 , wherein the cellulose-containing material is selected from uncoated paper, coated paper, card, kraft paper or kraft liner.

10. A rotary printing process according to claim 1 , characterised in that the printing ink comprises functional polymer materials.

11. A rotary printing process according to claim 10 , wherein the functional polymer materials are liquid-crystalline materials or electrically conductive polymers.

12. A rotary printing process according to claim 1 , wherein the printing ink comprises functional pigments and at least one binder.

13. A rotary printing process according to claim 12 , wherein the functional pigments are selected from UV or IR light-absorbent or reflective pigments, electrically conductive pigments, electrically semiconducting pigments, magnetisable pigments and/or luminescent pigments.

14. A rotary printing process according to claim 12 , wherein the functional pigments have an isotropic or anisotropic shape.

Assignees

• Merck Patent Gmbh

Inventors

• Becker Andreas
• Rathschlag Thomas
• Tasch Johannes

Classifications

• B41M1/04 Primary

  Flexographic printing · CPC title

• B41F31/26 Primary

  Construction of inking rollers (inking-rollers serving also to apply ink repellants in rotary lithographic machines B41F7/36) · CPC title

• B41F5/24

  for flexographic printing · CPC title

• B41P2200/12

  Flexographic printing · CPC title

• B42D25/369

  Magnetised or magnetisable materials · CPC title