Antifalsification paper provided with applied coding consisting of luminescent mottled fibers

• US 20030104176A1
• Filed: 09/27/2002
• Published: 06/05/2003
• Est. Priority Date: 12/23/1999
• Status: Active Grant

• Current Assignee: Giesecke & Devrient (Giesecke & Devrient GmbH)
• Original Assignee: Giesecke & Devrient GmbH
• Inventors: Schwenk, Gerhard
• Granted Patent: US 6,974,623 B2
• Time in Patent Office: Days
• US Class Current: 428/195.1
• CPC Class Codes: D21H 21/48 Elements suited for physical verification, e.g. by irradiation
• CPC Class Codes: Y10S 428/916 Fraud or tamper detecting
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24835 including developable image or soluble portion in coating or impregnation [e.g., safety paper, etc.]
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree

Abstract

The invention relates to a security paper with at least two types of mottled fibres, which differ in terms of their luminescent characteristics and form a code. In each case one type of mottled fibres is present in a defined subarea of the security paper, and the code is represented by the defined geometric arrangement of the subareas on the security paper and/or by the presence or absence of mottled fibres of a specific type.

Claims

1. Security paper with at least two types of mottled fibres, which differ in terms of their luminescent characteristics and which form a code, characterized in that the security paper has at least two defined subareas in which there is only one type of mottled fibres in each case, and in that the code is represented by a defined geometric arrangement of the subareas on the security paper and/or by the presence or absence of mottled fibres of a specific type.

4. Security paper according to at least one of claims 1 to 3, characterized in that the mottled fibres contain luminescent substances with characteristic luminescent characteristics.

5. Security paper according to claim 4, characterized in that the luminescent substances have a spectrally narrow emission band.

6. Security paper according to claim 4 or 5, characterized in that the luminescent substances emit outside the visual spectral range.

7. Security paper according to at least one of claims 4 to 6, characterized in that the luminescent substances are optical intensifying materials which have an optically pumpable, light-emitting material, light-scattering centres and a transparent matrix material.

8. Security paper according to at least one of claims 4 to 7, characterized in that the luminescent substances are present in the volume of the mottled fibres.

9. Security paper according to at least one of claims 4 to 7, characterized in that the mottled fibres are dyed with the luminescent substances.

10. Security paper according to at least one of claims 1 to 9, characterized in that the mottled fibres consist of a plastic material.

11. Security paper according to at least one of claims 1 to 10, characterized in that the mottled fibres are introduced into the security paper during the paper manufacture.

12. Security paper according to at least one of claims 1 to 11, characterized in that the mottled fibres are introduced into the security paper by means of the Wilcox process.

13. Security paper according to at least one of claims 1 to 12, characterized in that the geometric subareas have the form of strips.

14. Security paper according to claim 13, characterized in that the width of the strips lies in the range from 5 mm to 30 mm.

15. Security paper according to at least one of claims 1 to 14, characterized in that the mottled fibre density in the subareas lies in the range of 2 to 20 mottled fibres per square centimetre.

2. Security paper with mottled fibres, which have a luminescent characteristic and which form a code, characterized in that the security paper has at least two defined subareas, in which the mottled fibres are present, and in that the code is represented by a defined geometric arrangement of the subareas on the security paper.

3. Security paper according to claim 2, characterized in that the same mottled fibres are present in both subareas.