Process for production of metal-coated paper

• US 4,729,909 A
• Filed: 11/18/1986
• Issued: 03/08/1988
• Est. Priority Date: 07/22/1983
• Status: Expired due to Fees

• Current Assignee: Eckart-Werke Standard Bronzepulver-Werke Carl Eckart
• Original Assignee: Eckart-Werke Standard Bronzepulver-Werke Carl Eckart
• Inventors: Noack, Wolfgang
• Primary Examiner(s): Kittle, John E.
• Assistant Examiner(s): SCHWARTZ, PAMELA R
• Application Number:
  US06/931,967
• Time in Patent Office: 476 Days
• Field of Search: 427/391, 427/395, 427/428, 427/197, 427/288, 428/208, 428/211, 428/328-330, 428/342, 428/537.5
• US Class Current: 427/288
• CPC Class Codes: B05D 1/40 Distributing applied liquids or other fluent materials by members moving relatively to surface
• CPC Class Codes: D21H 19/06 applied as liquid or powder
• CPC Class Codes: Y10T 428/24909 Free metal or mineral containing
• CPC Class Codes: Y10T 428/24934 including paper layer
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof
• CPC Class Codes: Y10T 428/277 Cellulosic substrate
• CPC Class Codes: Y10T 428/31993 Of paper

Abstract

A process for production of a metal-coated paper, such as for use in cigarette packs having a metal coating containing a binding agent which is applied to a paper backing material by a printing process. The coating includes particles which have a flake structure and which can be fully wetted by the binding agent, as a result of which the particles of metal are so firmly embedded into the coating as to provide sufficient abrasion resistance to permit the resulting composite paper to be used in a high-speed automatic packaging machine. In this process for producing such a paper, a tool is pressed against and passed over the metal coating while still moist to smooth out the metal coating, whereupon the metal coating is dried.

Claims

1. A process for producing metal-coated paper by applying a printing ink to a paper carrier material, the process comprising the steps of:

(a) preparing a printing ink with a coating material made by first forming a metal pigment paste containing a solvent which has an evaporation index of below 25 and metal particles having a flake structure and of a non-leafing grade, and then fully wetting the metal particles therearound of the pigment paste by a resin binding agent; and

(b) applying the printing ink to the paper carrier material by an intaglio printing process in a thickness corresponding to a coating weight of from 0.5 to 10 g/m², wherein the proportion of metal in the coating is from 5 to 90% by weight with respect to the total weight of the coating.

2. A process as set forth in claim 1, wherein the metal pigment paste contains aluminum particles.

3. A process as set forth in claim 2, wherein ethylacetate or isopropanol are contained as solvent in the paste.

4. A process as set forth in claim 2, wherein the printing ink coating material is diluted with alcohol solvents.

5. A process as set forth in claim 2, wherein varnish is used as the binding agent.

6. A process as set forth in claim 2, wherein the printing ink is applied in a thickness corresponding to a coating weight of from 0.5 to 2.5 g/m².

7. A process as set forth in claim 2, wherein the portion of metal in the coating is from 40 to 90% by weight.

8. A process as set forth in claim 2, wherein the metal coating, while still moist on the paper carrier material, is passed over by means of a tool which is pressed against the metal coating, and only thereafter dried.

9. A process as set forth in claim 1, wherein ethylacetate or isopropanol are contained as solvent in the paste.

10. A process as set forth in claim 9, wherein the printing ink coating material is diluted with alcohol solvents.

11. A process as set forth in claim 9, wherein varnish is used as the binding agent.

12. A process as set forth in claim 9, wherein the printing ink is applied in a thickness corresponding to a coating weight of from 0.5 to 2.5 g/m².

13. A process as set forth in claim 9, wherein the portion of metal in the coating is from 40 to 90% by weight.

14. A process as set forth in claim 9, wherein the metal coating, while still moist on the paper carrier material, is passed over by means of a tool which is pressed against the metal coating, and only thereafter dried.

15. A process as set forth in claim 1, wherein the printing ink coating material is diluted with alcohol solvents.

16. A process as set forth in claim 15, wherein varnish is used as the binding agent.

17. A process as set forth in claim 15, wherein the printing ink is applied in a thickness corresponding to a coating weight of from 0.5 to 2.5 g/m².

18. A process as set forth in claim 10, wherein the portion of metal in the coating is from 40 to 90% by weight.

19. A process as set forth in claim 15, wherein the metal coating, while still moist on the paper carrier material, is passed over by means of a tool which is pressed against the metal coating, and only thereafter dried.

20. A process as set forth in claim 1, wherein varnish is used as the binding agent.

21. A process as set forth in claim 20, wherein the printing ink is applied in a thickness corresponding to a coating weight of from 0.5 to 2.5 g/m².

22. A process as set forth in claim 20, wherein the portion of metal in the coating is from 40 to 90% by weight.

23. A process as set forth in claim 20, wherein the metal coating, while still moist on the paper carrier material, is passed over by means of a tool which is pressed against the metal coating, and only thereafter dried.

24. A process as set forth in claim 1, wherein the printing ink is applied in a thickness corresponding to a coating weight of from 0.5 to 2.5 g/m².

25. A process as set forth in claim 24, wherein the portion of metal in the coating is from 40 to 90% by weight.

26. A process as set forth in claim 24, wherein the metal coating, while still moist on the paper carrier material, is passed over by means of a tool which is pressed against the metal coating, and only thereafter dried.

27. A process as set forth in claim 1, wherein the portion of metal in the coating is from 40 to 90% by weight.

28. A process as set forth in claim 27, wherein the metal coating, while still moist on the paper carrier material, is passed over by means of a tool which is pressed against the metal coating, and only thereafter dried.

29. A process according to claim 28, wherein an aromatic-free binding agent and solvent are used.

30. A process as set forth in claim 1, wherein the metal coating, while still moist on the paper carrier material, is passed over by means of a tool which is pressed against the metal coating, and only thereafter dried.

31. A process according to claim 1, wherein an aromatic-free binding agent is used.

32. A process according to claim 31, wherein an aromatic-free solvent is used.

33. A process according to claim 1, wherein an aromatic-free solvent is used.

34. A process for producing metal-coated paper in accordance with claim 1, wherein the paper carrier material has a thickness corresponding to a weight of from 30 to 90 g/m².

36. A process for producing metal-coated paper in accordance with claim 30, wherein the paper carrier material has a thickness corresponding to a weight of from 30 to 90 g/m².

35. A process for producing metal-coated paper by applying a printing ink to a paper carrier material, the process comprising the steps of:

(a) preparing a printing ink with a coating material made by first forming a metal pigment paste containing a solvent which has an evaporation index of below 25 and metal particles having a flake structure and of a non-leafing grade, and then fully wetting the metal particles therearound of the pigment paste by a resin binding agent in the form of a varnish; and

(b) applying the printing ink to the paper carrier material by a printing process in a thickness corresponding to a coating weight of from 0.5 to 10 g/m², wherein the proportion of metal in the coatings is from 5 to 90% by weight with respect to the total weight of the coating.