Electrically conductive paper structure, method for manufacturing same and use

Patent metadata

Field	Value
Publication number	US-12331464-B2
Application number	US-202017608688-A
Country	US
Kind code	B2
Filing date	Apr 27, 2020
Priority date	May 9, 2019
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

Electroconductive paper structure with cellulosic fibrous materials and electroconductive fibers, wherein the electroconductive paper structure has embedded therein a continuous, electroconductive thread for contacting the electroconductive paper structure from one end to the opposite end of the paper structure.

First claim

The invention claimed is:

1. An electroconductive paper structure, comprising:
at least one electroconductive paper ply with cellulosic fibrous materials and electroconductive fibers, and
a plurality of continuous, electroconductive threads embedded in and surrounded on at least three sides by the electroconductive paper ply for contacting the electroconductive paper structure from one end to the opposite end of the paper structure to provide a current to the electroconductive paper ply;
wherein the electroconductive paper structure is a heating element.

2. The electroconductive paper structure according to claim 1 , wherein the plurality of continuous, electroconductive threads for contacting the electroconductive paper structure from one end to the opposite end of the paper structure
assumes a value in the range of two to eight.

3. The electroconductive paper structure according to claim 1 , wherein the electroconductive fibers are metallic fibers and/or carbon fibers.

4. The electroconductive paper structure according to claim 1 , wherein the electroconductive paper structure contains additional electroconductive materials, wherein the additional electroconductive materials are carbon particles and/or carbon nanotubes.

5. The electroconductive paper structure according to claim 1 , wherein the plurality of continuous, electroconductive threads for contacting the electroconductive paper structure is a metal wire, a metal thread, a metal band, a thread based on a carrier substrate such as a plastic foil and coated with a metal, a laminate of (plastic) foils and metal foils, a metal braiding, a plait braiding, a knitted fabric or a tinsel wire.

6. The electroconductive paper structure according to claim 1 , wherein the paper structure is based on a single paper ply in which the plurality of continuous, electroconductive threads is embedded for contacting the electroconductive paper structure.

7. The electroconductive paper structure according to claim 1 , wherein the paper structure is based on two separate paper plies between which the plurality of continuous, electroconductive threads is arranged for contacting the electroconductive paper structure.

8. The electroconductive paper structure according to claim 1 , wherein the plurality of continuous, electroconductive threads for contacting the electroconductive paper structure is completely embedded in the paper ply so that the plurality of continuous, electroconductive threads is not visible to the viewer, neither from the front nor from the back; or
the plurality of continuous, electroconductive threads is embedded in the paper ply such that the plurality of continuous, electroconductive threads is present in the paper structure in a manner freely accessible on one side; or
the plurality of continuous, electroconductive threads is embedded in the paper ply such that the plurality of continuous, electroconductive threads is partially exposed on its surface at least at one place of the paper structure.

9. The electroconductive paper structure according to claim 1 , wherein the electroconductive paper structure additionally has chemical additives and residual moisture.

10. The electroconductive paper structure according to claim 1 , wherein the electroconductive paper structure is additionally-printed with a conductive pattern of conductor paths.

11. The electroconductive paper structure according claim 10 , wherein the electroconductive paper ply has embedded therein two or more continuous, electroconductive threads for contacting the electroconductive paper structure from one end to the opposite end of the paper structure,
wherein the threads are respectively embedded in the paper ply such that each thread is partially exposed on its surface at several places of the paper structure,
wherein the electroconductive paper structure is printed with the conductive pattern of conductive paths such that the contacting of the conductive pattern to the threads embedded in the paper ply is effected via the places at which the threads are partially exposed.

12. A method for manufacturing an electroconductive paper structure according to claim 1 , comprising:
providing a stock suspension made of cellulosic fibrous material and water;
adding at least one chemical additive, where applicable;
adding electroconductive fibers;
introducing at least one continuous, electroconductive thread into the stock suspension located in a cylinder paper machine,
wherein the thread is brought toward the cylinder sieve such that during the sheet formation or during the formation of the paper web an embedding of the thread into the fiber construction is effected.

13. The method according to claim 12 , wherein the paper structure is formed such that it is composed of two separate paper plies and the thread is arranged between these paper plies.

14. The electroconductive paper structure according to claim 1 , wherein the plurality of continuous, electroconductive threads establishes a local current supply to at least a region of the electroconductive paper structure.

15. The electroconductive paper structure according to claim 1 , wherein the plurality of continuous, electroconductive threads is embedded in and in at least one region entirely surrounded by the electroconductive paper ply.

16. An electroconductive paper structure, comprising:
at least one electroconductive paper ply with cellulosic fibrous materials and electroconductive fibers, and
a plurality of continuous, electroconductive threads are embedded in and surrounded on at least three sides by the electroconductive paper ply for contacting the electroconductive paper structure from one end to the opposite end of the paper structure to provide a current to the electroconductive paper ply;
wherein the electroconductive paper structure is additionally printed with a conductive pattern of conductor paths that have one or more bends;
wherein the electroconductive paper structure is a heating element.

Assignees

• Giesecke & Devrient Currency Technology Gmbh

Inventors

• Seidler Rudolf
• Lenssen Daniel
• Scherer Maik Rudolf Johann
• Hunger Christoph
• Bacher Erwin

Classifications

• D21H27/34

  Continuous materials, e.g. filaments, sheets, nets · CPC title

• D21H21/14

  characterised by function or properties in or on the paper (D21H19/66, D21H27/02 take precedence) · CPC title

• D21H17/67

  Water-insoluble compounds, e.g. fillers, pigments · CPC title

• D21H15/06

  Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments · CPC title

• B42D25/29

  Securities; Bank notes · CPC title