Method of producing marking on a surface by means of laser radiation and use of an embossing foil in such a method

• US 5,985,078 A
• Filed: 10/14/1992
• Issued: 11/16/1999
• Est. Priority Date: 10/17/1991
• Status: Expired due to Fees

• Current Assignee: Leonhard KURZ Stiftung & Company KG
• Original Assignee: Leonhard KURZ Stiftung & Company KG
• Inventors: Suess, Joachim, Zinner, Gerhard
• Primary Examiner(s): Mayes, Curtis
• Application Number:
  US07/960,892
• Time in Patent Office: 2,589 Days
• Field of Search: 156/272.8, 156/239, 156/235, 156/240, 156/268, 156/277, 156/230, 156/237, 219/121.68, 219/121.77
• US Class Current: 156/239
• CPC Class Codes: B41M 5/24 Ablative recording, e.g. by burning marks; Spark recording marking by high energetic means, e.g. by laser otherwise than burning or ablative removal B41M5/26; materials or methods for recording or reproduction by optical means G11B7/00
• CPC Class Codes: B41M 5/34 Multicolour thermography
• CPC Class Codes: B44C 1/02 Pyrography
• CPC Class Codes: B44C 1/1729 Hot stamping techniques
• CPC Class Codes: B44C 1/228 by laser radiation

Abstract

In a method of producing marking or the like on a surface by means of laser radiation, at least two layers of lacquer of different colors are successively applied to the surface and at least the outer layer which is towards the viewer of the surface is removed by laser radiation in a region-wise manner to expose the second layer therebeneath, thereby producing the marking on the surface. At least the outer layer is applied by a transfer operation from a carrier material, in order thereby to produce a uniform thickness for that layer and thus a highly uniform laser-engraving effect. Also described is the use of embossing foils and more especially hot embossing foils of a particular configuration in such a method.

Claims

1. A method of marking a surface, which comprises:

forming at least two layers of differently-colored lacquer on a carrier;

transferring said layers of differently-colored lacquers to said surface; and

exposing region-wise said layer of colored lacquer remote from said surface to laser radiation to thereby expose said layer of colored lacquer proximate said surface thereby producing said marking on said surface.

2. The method as defined in claim 1 and further including the steps of applying a transparent protective lacquer layer over said layers of differently-colored lacquer.

3. The method as defined in claim 2, wherein said transparent protective layer is applied prior to laser radiation.

4. The method as defined in claim 2 wherein said transparent protective layer is applied after laser radiation.

5. The method as defined in claim 1 wherein said at least two layers of differently-colored lacquers are formed on said carrier after forming a release layer on said carrier.

6. The method as defined in claim 1 and further including the step of forming an adhesive layer on a last formed differently-colored lacquer layer.

7. The method as defined in claim 6 wherein said carrier is an embossing foil.

8. The method as defined in claim 7 wherein said embossing foil is a hot embossing foil.

9. The method as defined in claim 1 wherein said carrier is a polyester film.