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Method and device for producing security paper with windowed security thread

A technology of anti-counterfeiting thread and anti-counterfeiting paper, applied in papermaking, paper machine, textile and papermaking, etc., can solve the problems of pattern excavation limitation, difference, and flat state deterioration.

Active Publication Date: 2022-05-31
GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, if non-rectangular window shapes are used, wire wiggle often leads to poor flatness and very different and not clearly defined window arrangements
Moreover, to reasonably complement, wiggle regions need to be considered when designing patterns, which leads to a large limitation on pattern mining

Method used

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  • Method and device for producing security paper with windowed security thread
  • Method and device for producing security paper with windowed security thread
  • Method and device for producing security paper with windowed security thread

Examples

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Embodiment Construction

[0029] The present invention is described here by taking the manufacture of security paper with a windowed security thread for banknotes as an example. To this end, Figure 1 shows

[0030] In the paper web 20 thus produced, the security thread 22 is located substantially in the inner plane of the paper, but where the security thread 22 is

[0031] To ensure that the threads that are laid do not then exactly overlap each other in the stack, during papermaking, there is a

[0032] As mentioned above, in this process, the anti-counterfeiting thread usually reciprocates on the rectangular protrusion, so the width of the protrusion is

[0035] Here, a plurality of protruding wire window elements 34 are respectively arranged along the circumferential direction U of the manufacturing mesh sleeve 30, and during the papermaking process

[0036] In the embodiment of FIG. 2, a particularly preferred case of n=1 and a sinusoidal offset 36 is shown, wherein the offset period

[0041] On the ot...

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PUM

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Abstract

The invention relates to a cylinder screen (12) of a cylinder paper machine (10) for producing security paper (42A, 42B) with a partially embedded windowed security thread (22) , wherein, during the papermaking process, the cylindrical screen (12) draws paper stock in the form of fiber-water-suspension (14) from the pulp tank (16), and wherein the cylindrical screen (12) contains a To (U) and the transverse direction (Q) perpendicular to the circumferential direction (Q), the manufacturing net cover (30), the manufacturing net cover is equipped with a plurality of protruding line window elements (34) along the circumferential direction (U), during the papermaking process wherein said windowed security thread (22) is placed on said thread window element in order to locally inhibit the accumulation of fiber-water-suspension (14) to produce a thread window (40). According to the invention it is provided here that the wire window elements (34) are arranged with an offset (36) in the transverse direction (Q) which is periodic in the circumferential direction, wherein the cylindrical screen circumference R U is an integer multiple of the offset period P. The invention also includes a corresponding method for producing security paper.

Description

Method and device for manufacturing anti-counterfeiting paper with windowed anti-counterfeiting thread technical field [0001] The present invention relates to a method and device for manufacturing anti-counterfeiting paper with a windowed security thread (or a windowed security thread). set. Background technique [0002] In order to provide security, security papers or documents of value are often provided with authenticity features, such as watermarks, embedded security Pseudo-threads, etc., these authenticity features allow checking the authenticity of security papers or documents of value or at the same time serve as protection against unauthorized Reproduction with permission. [0003] In the past, authenticity features that could only be introduced into security papers during manufacture have proven reliable here, such as Security thread fully or partially embedded in security paper. In this case, neither fully applied to the surface of the security paper nor ful...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B42D25/351B42D25/355B42D25/29D21F11/00D21F11/06D21H21/42
CPCB42D25/29B42D25/355D21F11/008D21F11/06D21H21/42B42D25/351
Inventor A.埃格纳A.哈内尔特A.坦特施尔A.德雷克斯勒M.普勒格
Owner GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
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