EP1064424A1 - Improved process for the preparation of security thread - Google Patents

Improved process for the preparation of security thread

Info

Publication number
EP1064424A1
EP1064424A1 EP99906557A EP99906557A EP1064424A1 EP 1064424 A1 EP1064424 A1 EP 1064424A1 EP 99906557 A EP99906557 A EP 99906557A EP 99906557 A EP99906557 A EP 99906557A EP 1064424 A1 EP1064424 A1 EP 1064424A1
Authority
EP
European Patent Office
Prior art keywords
water
security thread
soluble ink
ink layer
security
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99906557A
Other languages
German (de)
French (fr)
Other versions
EP1064424B1 (en
Inventor
Jong Kyu Kim
Yong Hwan Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korea Minting and Security Printing Corp
Original Assignee
Korea Minting and Security Printing Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Korea Minting and Security Printing Corp filed Critical Korea Minting and Security Printing Corp
Publication of EP1064424A1 publication Critical patent/EP1064424A1/en
Application granted granted Critical
Publication of EP1064424B1 publication Critical patent/EP1064424B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42—Ribbons or strips

Definitions

  • the present invention relates to an improved process for the preparation of security threads suitable for use in security articles.
  • Security documents such as bank notes, stocks, bonds, checks, warrants and identification cards need to be guarded by antifalsification measures and they are often made from a security paper having a security element in the form of fibers, strips or threads embedded therein.
  • GB 2,213,098 discloses a partially metallized film strip, used as a security thread, which has metal-free portions in the form of a pattern, design, indicia, etc. to provide a continuous metal path along the length of the strip ' .
  • Japanese Laid-open Patent Publication No. 216795/1988 teaches a security strip having a metallized pattern on the surface of a transparent film.
  • an object of the present invention to provide an improved process for preparing a security thread suitable for use in a security paper.
  • a process for the preparation of a security thread having a partially metallized layer which comprises: forming a water-soluble ink layer on a selected portion of the surface of a transparent film; depositing a layer of a metal selected from the group consisting of aluminum, tin, silver and an alloy of cobalt and nickel on the entire surface of the transparent film including the water-soluble ink layer; and washing the metal deposited film with water to ' remove the portion of the metal layer deposited on the water-soluble ink layer.
  • Figs. 5 to 8 illustrate other embodiments of security threads prepared in accordance with the inventive process.
  • a water-based ink which is soluble in water, is printed on a selected portion of the surface of a transparent film substrate, in the form of a character, pattern or figure to form a partial water- soluble ink layer.
  • the substrate may be made from any material known in the art such as a polyester (e.g., polyethylene terephthalate (PET) ) , polyvinyl chloride, polypropylene and the like.
  • PET polyethylene terephthalate
  • the water-based ink may be any one conventionally used in the art.
  • a layer of a metal is deposited on the entire surface of the film including the printed ink layer.
  • the deposition may be carried out by vacuum deposition methods which are well known by a skilled person in the art.
  • Representative examples of the metal suitable for forming the metal layer are aluminum, tin, a metal alloy (e.g., Co and Ni) , silver and the like.
  • the thickness of the metal layer ranges from 1 A to 2 ⁇ m.
  • the metal-deposited film is washed with -4- water, preferably with brushing, to remove the portion of the metal layer deposited on the water-soluble ink layer, to obtain a film having a partially metallized layer.
  • a security thread having a enhanced security feature may be obtained by employing a fluorescent pigment or dyestuff to provide a partially metallized film having both a demetallized portion and a dyed portion.
  • a partial coating of the fluorescent pigment or dyestuff is applied to a selected portion of the film surface prior to the step of printing the water-soluble ink.
  • the water-soluble ink layer may be so formed as to mask the dyed portion.
  • the fluorescent pigment or dyestuff may be any one conventionally used in the art and the coating thereof may be applied in the form of a character, pattern or figure, or a combination thereof, preferably by a gravure printing method.
  • the security thread of the present invention has a thickness and width suitable for use in security documents, e.g., a thickness ranging from about 15 to 35 ⁇ m and a width ranging from 0.5 to 5 mm.
  • the security thread of the present invention may be preferably embedded between two sheets of paper formed separately on a paper making machine and subsequently brought together to form a security paper having an embedded security thread.
  • Figs. 1 to 4 show the steps of forming a partially- metallized film having a transparent region in the form of a set of characters and a dyed region in the form of another set of characters in accordance with one embodiment of the present invention.
  • a fluorescent dyestuff or pigment composition such as Lumilux CD 305, CD 316 or Papilion is applied in the form of a set of characters (2) on the surface of a transparent polyester substrate (10) at a regular interval by a gravure printing method.
  • a water-based ink is printed on the film to form a mask (30) of the printed characters portion (2) and, simultaneously, a design (31) in the form of another set of characters .
  • Aluminum is deposited on the resulting film by a vacuum deposition method to form an aluminum layer (4) at a thickness of 1 A to 2 ⁇ m over the entire surface of the film, as shown in Fig. 3.
  • an aluminum-deposited film (1) comprising transparent characters (5) (corresponds to the design (31) ) and printed characters (2) positioned in a transparent region (10) .
  • Figs. 5 to 8 illustrate other embodiments of security threads prepared by the inventive process.
  • -6- Fig. 5 shows a security thread (1) having alternating metal- deposited portion (4) comprising transparent characters (5) , and transparent substrate region (10) comprising colored characters (2) at a regular interval.
  • a metallized security thread (1) having various patterns of colored regions (2) , optionally positioned in transparent regions.
  • Fig. 7 shows a security thread (1) produced by forming metallized bands (4) in a regular pattern on a transparent base film (10), and
  • Fig. 8 shows a security thread (1) obtained by a chain of imprinting alternating colored (2) and metallized links (4) on a base film (10) .

Landscapes

  • Paper (AREA)
  • Credit Cards Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Printing Methods (AREA)
  • Polymerisation Methods In General (AREA)
  • Air Bags (AREA)

Abstract

A security thread having an enhanced security feature is produced by forming a water-soluble ink layer on a selected portion of the surface of a transparent film; depositing a metal layer on the film surface including the water-soluble ink layer; and washing the metal deposited film with water to remove the portion of the metal layer deposited on the water-soluble ink layer.

Description

-1- IMPROVED PROCESS FOR THE PREPARATION OF SECURITY THREAD
Field of the Invention
The present invention relates to an improved process for the preparation of security threads suitable for use in security articles.
Background of the Invention
Security documents such as bank notes, stocks, bonds, checks, warrants and identification cards need to be guarded by antifalsification measures and they are often made from a security paper having a security element in the form of fibers, strips or threads embedded therein.
For example, GB 2,213,098 discloses a partially metallized film strip, used as a security thread, which has metal-free portions in the form of a pattern, design, indicia, etc. to provide a continuous metal path along the length of the strip'.
Further, Japanese Laid-open Patent Publication No. 216795/1988 teaches a security strip having a metallized pattern on the surface of a transparent film.
However, prior art method of preparing partially metallized films, useful as security threads, comprise complicated and hazardous etching techniques. - 2 -
Summary of the Invention
It is, therefore, an object of the present invention to provide an improved process for preparing a security thread suitable for use in a security paper.
It is another object of the present invention to provide a security thread having enhanced security features . It is still another object of the present invention to provide a security paper containing the inventive security thread.
In accordance with an aspect of the present invention, there is provided a process for the preparation of a security thread having a partially metallized layer, which comprises: forming a water-soluble ink layer on a selected portion of the surface of a transparent film; depositing a layer of a metal selected from the group consisting of aluminum, tin, silver and an alloy of cobalt and nickel on the entire surface of the transparent film including the water-soluble ink layer; and washing the metal deposited film with water to ' remove the portion of the metal layer deposited on the water-soluble ink layer.
Brief Description of Drawing
The above and other objects and features of the present invention will become apparent from the following description, taken in conjunction with the accompanying drawing, wherein: -3- Figs . 1 to 4 show the steps of forming a partially- metallized film having a transparent region in the form of a set of characters and a dyed region in the form of another set of characters in accordance with one embodiment of the present invention; and
Figs. 5 to 8 illustrate other embodiments of security threads prepared in accordance with the inventive process.
Detailed Description of the Invention
In practicing the present invention, a water-based ink, which is soluble in water, is printed on a selected portion of the surface of a transparent film substrate, in the form of a character, pattern or figure to form a partial water- soluble ink layer. The substrate may be made from any material known in the art such as a polyester (e.g., polyethylene terephthalate (PET) ) , polyvinyl chloride, polypropylene and the like. The water-based ink may be any one conventionally used in the art. Subsequently, a layer of a metal is deposited on the entire surface of the film including the printed ink layer. The deposition may be carried out by vacuum deposition methods which are well known by a skilled person in the art. Representative examples of the metal suitable for forming the metal layer are aluminum, tin, a metal alloy (e.g., Co and Ni) , silver and the like. The thickness of the metal layer ranges from 1 A to 2 μm.
Thereafter, the metal-deposited film is washed with -4- water, preferably with brushing, to remove the portion of the metal layer deposited on the water-soluble ink layer, to obtain a film having a partially metallized layer.
In the present invention, a security thread having a enhanced security feature may be obtained by employing a fluorescent pigment or dyestuff to provide a partially metallized film having both a demetallized portion and a dyed portion. In this case, a partial coating of the fluorescent pigment or dyestuff is applied to a selected portion of the film surface prior to the step of printing the water-soluble ink. Alternatively, if desired, the water-soluble ink layer may be so formed as to mask the dyed portion. The fluorescent pigment or dyestuff may be any one conventionally used in the art and the coating thereof may be applied in the form of a character, pattern or figure, or a combination thereof, preferably by a gravure printing method.
The security thread of the present invention has a thickness and width suitable for use in security documents, e.g., a thickness ranging from about 15 to 35 μm and a width ranging from 0.5 to 5 mm.
The security thread of the present invention may be preferably embedded between two sheets of paper formed separately on a paper making machine and subsequently brought together to form a security paper having an embedded security thread. -5- One Embodiment of the Invention
Figs. 1 to 4 show the steps of forming a partially- metallized film having a transparent region in the form of a set of characters and a dyed region in the form of another set of characters in accordance with one embodiment of the present invention.
Referring to Fig. 1, a fluorescent dyestuff or pigment composition such as Lumilux CD 305, CD 316 or Papilion is applied in the form of a set of characters (2) on the surface of a transparent polyester substrate (10) at a regular interval by a gravure printing method.
Subsequently, as shown in Fig. 2, a water-based ink is printed on the film to form a mask (30) of the printed characters portion (2) and, simultaneously, a design (31) in the form of another set of characters .
Aluminum is deposited on the resulting film by a vacuum deposition method to form an aluminum layer (4) at a thickness of 1 A to 2 μm over the entire surface of the film, as shown in Fig. 3.
Finally, the portions of the aluminum layer deposited on the mask (30) and the design (31) are removed by washing with water, while brushing, to obtain an aluminum-deposited film (1) comprising transparent characters (5) (corresponds to the design (31) ) and printed characters (2) positioned in a transparent region (10) .
Figs. 5 to 8 illustrate other embodiments of security threads prepared by the inventive process. Specifically, -6- Fig. 5 shows a security thread (1) having alternating metal- deposited portion (4) comprising transparent characters (5) , and transparent substrate region (10) comprising colored characters (2) at a regular interval. Further, referring to Fig. 6, there is provided a metallized security thread (1) having various patterns of colored regions (2) , optionally positioned in transparent regions. Fig. 7 shows a security thread (1) produced by forming metallized bands (4) in a regular pattern on a transparent base film (10), and Fig. 8 shows a security thread (1) obtained by a chain of imprinting alternating colored (2) and metallized links (4) on a base film (10) .
While the invention has been described with respect to the specific embodiments, it should be recognized that various modifications and changes may be made by those skilled in the art to the invention which also fall within the scope of the invention as defined by the appended claims .

Claims

- 7 -Claims :
1. A process for the preparation of a security thread having a partially metallized layer, which comprises: forming a water-soluble ink layer on a selected portion of the surface of a transparent film; depositing a layer of a metal selected from the group consisting of aluminum, tin, silver and an alloy of cobalt and nickel on the entire surface of the transparent film including the water-soluble ink layer; and washing the metal deposited film with water to remove the portion of the metal layer deposited on the water-soluble ink layer.
2. The process of claim 1 further comprising applying a partial coating of a fluorescent pigment or dyestuff on the surface of the film in the form of a figure, character or pattern, prior to the step of forming the water-soluble ink layer.
3. The process of claim 2 wherein the water-soluble ink layer masks the pigment or dyestuff coating.
4. The process of claim 2 wherein the transparent film is made of a polyester or polyvinyl chloride.
5. A security thread prepared by the process of any one of claims 2 to 4.
-8- 6. The security thread of claim 5 wherein the security thread has a thickness ranging from 15 to 35 ╬╝m and a width ranging from 0.5 to 5 mm.
7. A security paper comprising the security thread of claim 5 or 6.
EP99906557A 1998-03-02 1999-02-26 Improved process for the preparation of security thread Expired - Lifetime EP1064424B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR9806706 1998-03-02
KR1019980006706A KR19990073639A (en) 1998-03-02 1998-03-02 Manufacturing method of silver wire with partial deposition part and colored printing layer
PCT/KR1999/000089 WO1999045199A1 (en) 1998-03-02 1999-02-26 Improved process for the preparation of security thread

Publications (2)

Publication Number Publication Date
EP1064424A1 true EP1064424A1 (en) 2001-01-03
EP1064424B1 EP1064424B1 (en) 2005-09-14

Family

ID=19534044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99906557A Expired - Lifetime EP1064424B1 (en) 1998-03-02 1999-02-26 Improved process for the preparation of security thread

Country Status (8)

Country Link
EP (1) EP1064424B1 (en)
KR (1) KR19990073639A (en)
CN (1) CN1107764C (en)
AT (1) ATE304627T1 (en)
DE (1) DE69927248T2 (en)
ES (1) ES2245090T3 (en)
RU (1) RU2188268C2 (en)
WO (1) WO1999045199A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2856339B1 (en) † 2003-06-23 2006-05-26 Banque De France SECURITY BAND FOR DOCUMENTATION AND SECURE DOCUMENT
EP1516957A1 (en) * 2003-09-17 2005-03-23 Hueck Folien Ges.m.b.H Security element with colored indicia
AT504750B1 (en) * 2003-09-17 2009-01-15 Hueck Folien Gmbh METHOD FOR PRODUCING A SECURITY ELEMENT WITH NEGATIVE COLOR CODINGS, IF APPLICABLE
CN1329587C (en) * 2004-10-22 2007-08-01 中国印钞造币总公司 Anti-false paper and manufacturing method thereof
CN1313676C (en) * 2004-10-25 2007-05-02 中国印钞造币总公司 Composite false-proof safety thread and its production method, false-proof paper applying the safety thread
GB2429187B (en) 2005-08-15 2007-08-08 Rue De Int Ltd Security devices for security substrates
CN101314311B (en) * 2007-05-30 2011-06-15 中国印钞造币总公司 False proof thin film and producing method thereof
DE102008030409A1 (en) † 2008-06-27 2009-12-31 Giesecke & Devrient Gmbh Safety element with recess and method for producing the same
US20120094038A1 (en) * 2010-10-13 2012-04-19 Honeywell International Inc. Use of humidity stable yellow fluorescent pigments in security applications
KR20160083200A (en) 2014-12-30 2016-07-12 한국조폐공사 Forgery prevention security thread, and manufacturing method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570101B1 (en) * 1984-09-07 1987-09-25 Sotimag ANTI-FRAUD PROCESS FOR VALUE DOCUMENTS
JPH03152583A (en) * 1989-11-09 1991-06-28 Kiso Kasei Sangyo Kk Film for preventing copy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9945199A1 *

Also Published As

Publication number Publication date
DE69927248D1 (en) 2005-10-20
CN1107764C (en) 2003-05-07
ATE304627T1 (en) 2005-09-15
DE69927248T2 (en) 2006-01-12
RU2188268C2 (en) 2002-08-27
ES2245090T3 (en) 2005-12-16
CN1292054A (en) 2001-04-18
KR19990073639A (en) 1999-10-05
EP1064424B1 (en) 2005-09-14
WO1999045199A1 (en) 1999-09-10

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