Apparatus and method for printing

• US 6,648,470 B2
• Filed: 02/05/2002
• Issued: 11/18/2003
• Est. Priority Date: 11/23/1995
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Industrial Printing Ltd (HP Inc.)
• Original Assignee: Aprion Digital Ltd. (Suny Cellular Communication Ltd.)
• Inventors: Korem, Aharon
• Primary Examiner(s): Funk, Stephen R.
• Application Number:
  US10/062,539
• Publication Number:
  US 20020071704A1
• Time in Patent Office: 651 Days
• Field of Search: 101/453, 101/454, 101/463.1, 101/150, 101/153, 101/170, 101/401.1, 347/101-107
• US Class Current: 347/106
• CPC Class Codes: B41C 1/1075 Mechanical aspects of on-press plate preparation B41C1/1008 - B41C1/1066 take precedence
• CPC Class Codes: B41F 7/02 for offset printing
• CPC Class Codes: B41J 29/17 Cleaning arrangements
• CPC Class Codes: B41J 3/543 with multiple inkjet print heads B41J2/17503, B41J2/2103 take precedence
• CPC Class Codes: B41J 3/546 Combination of different types, e.g. using a thermal transfer head and an inkjet print head
• CPC Class Codes: B41P 2227/70 Forming the printing surface directly on the form cylinder

Abstract

A printing method and system, which includes at least one printing apparatus, is provided. Each printing apparatus includes an ink jet device comprising at least one ink jet nozzle to eject droplets of ink according to image data, a printing member having ink-attracting areas each located within an ink repelling area. One or more of the ink attracting areas may receive the droplets of ink ejected from the ink jet device in a pattern corresponding to the image data. Each printing apparatus also includes a transfer system to transfer the inked pattern from the printing member onto a printing substrate.

Claims

1. A printing system comprising:

one or more printing apparatus comprising;

an ink jet device comprising at least one ink jet nozzle to eject droplets of ink according to image data;

a printing member having ink attracting areas each located within an ink repelling area, wherein one or more of said ink attracting areas receive said droplets of ink in a pattern corresponding to said image data; and

a transfer system to transfer said pattern from said printing member onto a printing substrate,

wherein each of said ink attracting areas is sized and configured to distribute each received ink droplet over substantially all of its surface.

2. The printing system of claim 1, wherein said ink attracting areas are randomly distributed within said ink repelling area.

3. The printing system of claim 1, wherein said ink attracting areas are distributed in a predetermined resolution within said ink repelling area.

4. The printing system of claim 3, wherein said predetermined resolution comprises a plurality of grid points.

5. The printing system of claim 1, further comprising a cleaning system to clean said printing member after the operation of said transfer system.

6. The printing system of claim 5 and further comprising at least one heating system to heat said printing member.

7. The printing system of claim 1 further comprising a UV curing system downstream said transfer system, to cure UV curable ink transferred to said printing substrate.

8. The printing system of claim 1 wherein said printing apparatus comprises a plate cylinder to mount said printing member thereon and wherein said transfer system comprises:

a blanket cylinder to transfer said pattern to said printing substrate; and

an impression cylinder to impress said printing substrate against said blanket cylinder.

9. The printing system of claim 1, wherein said printing member is a gravure like cylinder having depressions forming said ink attracting areas and elevated portions forming said ink repelling area.

10. The printing system of claim 9 wherein said transfer system comprises an impression cylinder for impressing said printing substrate against said gravure like cylinder.

11. The printing system of claim 1, wherein said printing member is a cylinder having elevated portions forming said ink attracting areas and depressions forming said ink repelling area.

12. The printing system of claim 11 wherein said transfer system comprises a blanket cylinder to transfer said pattern to said printing substrate and an impression cylinder to impress said printing substrate against said blanket cylinder.

13. The printing system of claim 1, wherein said printing member is a rotatable belt.

14. The printing system of claim 13, wherein said transfer system comprises a blanket cylinder to transfer said pattern to said printing substrate and an impression cylinder to impress said printing substrate against said blanket cylinder.

15. The printing system of claim 13, wherein said transfer system comprises an impression cylinder to impress said printing substrate against said rotatable belt.

16. The printing system of claim 1 wherein said ink-jet device comprises a line array of ink jet nozzles operating to eject said ink onto a portion of said ink attracting areas substantially simultaneously.

17. The printing system of claim 1, wherein said printing member is a printing cylinder and said ink jet device comprises a plurality of linear arrays, wherein said arrays are positioned in a substantially equal distance from said printing member.

18. The printing system of claim 16, wherein said ink attracting areas are distributed within said ink repelling area in a predetermined resolution, said resolution is higher than the resolution of said nozzles.

19. The printing system of claim 1, wherein said ink attracting areas are hydrophilic and said ink repelling area is hydrophobic.

20. The printing system of claim 1, wherein said ink receptive areas are oleophilic and said ink repelling area is oleophobic.

21. The printing system of claim 1, wherein the number of said one or more printing apparatus corresponds to the number of printing inks forming said pattern.

22. The printing system of claim 21, wherein said printing system comprises four of said printing apparatus, each for inking one of the four process colors CMYK.

23. A printing method comprising:

providing a printing member having ink attracting areas distributed within an ink repelling area in a desired resolution, each of said ink attracting areas is sized and configured to distribute an ink droplet received thereon over substantially all of its surface;

ejecting from one or more nozzles of an ink jet device droplets of ink onto one or more of said ink attracting areas so as to form an inked pattern thereon, said pattern corresponding to a representation of an image; and

transferring said inked pattern from said printing member onto a printing substrate.

24. The printing method of claim 23 further comprising cleaning said printing member after transferring said inked pattern.

25. The printing method of claim 23 further comprising heating said printing member.

26. The printing method of claim 23 wherein said ink is a UV curable ink and wherein said printing method further comprising curing said UV curable ink after transferring said inked pattern.

27. The printing method of claim 23 wherein said ejecting comprises ejecting from a line array of said one or more nozzles, said nozzles having a resolution lower than said desired resolution.