WO1999054550A1 - Security paper having embedded security feature and method of preparing same - Google Patents

Security paper having embedded security feature and method of preparing same Download PDF

Info

Publication number
WO1999054550A1
WO1999054550A1 PCT/KR1999/000088 KR9900088W WO9954550A1 WO 1999054550 A1 WO1999054550 A1 WO 1999054550A1 KR 9900088 W KR9900088 W KR 9900088W WO 9954550 A1 WO9954550 A1 WO 9954550A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
security
layer
polyolefin
sheets
Prior art date
Application number
PCT/KR1999/000088
Other languages
French (fr)
Inventor
Jung Ku Kang
Jong Kyu Kim
Deok Kyu Choi
Yong Hwan Park
Original Assignee
Korea Security Printing And Minting Corporation
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 Security Printing And Minting Corporation filed Critical Korea Security Printing And Minting Corporation
Priority to EP99906556A priority Critical patent/EP1080269B1/en
Priority to DE69934979T priority patent/DE69934979T2/en
Publication of WO1999054550A1 publication Critical patent/WO1999054550A1/en

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/32—Multi-ply with materials applied between the sheets

Definitions

  • the present invention relates to a security paper having an embedded security feature, and a method of preparing same using a hot-melt film bearing a printed security image .
  • Security documents such as banknotes, checks, stocks and the like need to be guarded by antifalsification measures and they are often made from a security paper having an embedded security element in the form of security features, security threads, security fibers and planchettes .
  • Japanese Patent Publication Nos . 88-270898 and 90-133697 describe a method of manufacturing a security paper having an embedded security image, which comprises the steps of inserting a water-soluble polyvinylalcohol film having a print layer bearing the security image in the form of a figure or pattern between two sheets of wet paper and dissolving the film, thereby imprinting the security image on the interface of the two paper sheets.
  • the method has problems in that the dissolution rate of the water-soluble film is not easy to control and the handling of such a film sandwiched between two sheets of paper during a paper making process is difficult due to the differences in properties of the film and paper sheets in terms of expansion coefficient and tensile strength.
  • European Patent 0 453 131 A2 discloses a method of impregnating a security feature in paper using a bonding agent. This method comprises applying a print layer onto a sheet of paper and then covering another sheet of paper thereon using a bonding agent . This method which is complex - 2 - and requires the use of a bonding agent may not be suitably employed in a commercial process .
  • a method of making a security paper having an embedded security feature in the form of a figure, character or pattern which comprises, inserting a polyolefin film bearing a print ink layer of the security feature between two sheets of wet paper; pressing the sheets together; and heating the pressed sheets at a temperature above the melting temperature of the polyolefin.
  • a security paper having an embedded security feature formed by the above method is provided.
  • Figure 1 exhibits a schematic representation of the method of manufacturing a security paper according to one embodiment of the present invention
  • Figures 2 shows the cross-sectional side view of a composite film (30) composed of a print layer (33) , a hot- melt film layer (32) and a supporting base film layer (31) ;
  • Figure 3 illustrates an apparatus used in stinging a composite film (30) .
  • one preferred embodiment of the present invention may be conducted as follows using a Fourdrinier paper making machine (10) and a cylinder mould paper making machine (20) .
  • a paper fiber web formed thereon passes through a preliminary wet press (11) to form a wet paper sheet (1) .
  • Another wet paper sheet (2) is prepared using the cylinder mould paper making machine (20) , wherein cylinder
  • polyolefin- based hot-melt film (3) bearing a printed security image in the form of a figure, character or pattern is introduced and inserted between two converging wet paper sheets (1 and 2) .
  • the hot-melt film may be made of polyethylene, polypropylene, polybutene or polystyrene, polyethylene being the preferred.
  • the converged wet paper sheets (1 and 2) with film (3) sandwiched therebetween pass through two sets of wet press (6) to remove excess water therefrom, and then, are dried and fused together by the adhesive action of molten polymer of film (3) over drying drum (4) heated at a temperature above the melting point of the hot-melt film, preferably 80 to 120 °C.
  • film (3) comprises polyolefin layer (32) and print ink layer (33) (Fig. 2) .
  • Film (3) is preferably very thin and has a thickness ranging from 10 to 25 ⁇ m.
  • polyolefin layer (32) is so thin, it does not have a sufficient tensile strength to support mechanical tension during a printing process to produce print layer (33) thereon. Accordingly, referring to Fig. 2, polyolefin layer (32) is laminated on reinforcing support layer (31) , a polyester, polyethylene or polypropylene layer having a thickness of about 30 ⁇ m, and, then, the reinforced polyolefin layer is subjected to a printing process to provide print layer (33) on polyolefin layer (32) , to form composite film (30) .
  • composite film (30) may be preferably passed through roll (5) which has several sting needles (51) at regular intervals as shown in Fig. 3.
  • This perforation treatment imparts good air permeability to film (3), which is beneficial in terms of enhancing drying of the sheets on the drying drum.
  • the reinforcing support layer (31) is removed from composite (30) just before film (3) is introduced into the paper making apparatus shown in Fig. 1.
  • the ink of the print layer also melts to make imprints on the interface of the two paper sheets.
  • a laroflex-based gravure ink thus may be preferably used because it has a melting point and expansion coefficient similar to that of a preferred hot-melt polyethylene resin.

Abstract

A security paper having an embedded security feature in the form of a figure, character or pattern is prepared by a method which comprises, inserting a polyolefin film bearing a print ink layer of the security feature between two sheets of wet paper; pressing the sheets together; and heating the pressed sheets at a temperature above the melting point of the polyolefin.

Description

SECURITY PAPER HAVING EMBEDDED SECURITY FEATURE AND METHOD OF PREPARING SAME
Field of the Invention
The present invention relates to a security paper having an embedded security feature, and a method of preparing same using a hot-melt film bearing a printed security image .
Background of the Invention
Security documents such as banknotes, checks, stocks and the like need to be guarded by antifalsification measures and they are often made from a security paper having an embedded security element in the form of security features, security threads, security fibers and planchettes .
For example, Japanese Patent Publication Nos . 88-270898 and 90-133697 describe a method of manufacturing a security paper having an embedded security image, which comprises the steps of inserting a water-soluble polyvinylalcohol film having a print layer bearing the security image in the form of a figure or pattern between two sheets of wet paper and dissolving the film, thereby imprinting the security image on the interface of the two paper sheets.
However, the method has problems in that the dissolution rate of the water-soluble film is not easy to control and the handling of such a film sandwiched between two sheets of paper during a paper making process is difficult due to the differences in properties of the film and paper sheets in terms of expansion coefficient and tensile strength.
European Patent 0 453 131 A2 discloses a method of impregnating a security feature in paper using a bonding agent. This method comprises applying a print layer onto a sheet of paper and then covering another sheet of paper thereon using a bonding agent . This method which is complex - 2 - and requires the use of a bonding agent may not be suitably employed in a commercial process .
Summary of the Invention
Accordingly, it is an object of the present invention to provide an improved method of making a security paper having an embedded security feature.
Further, it is another object of the present invention to provide a security paper having an enhanced security feature .
In accordance with one aspect of the present invention, there is provided a method of making a security paper having an embedded security feature in the form of a figure, character or pattern, which comprises, inserting a polyolefin film bearing a print ink layer of the security feature between two sheets of wet paper; pressing the sheets together; and heating the pressed sheets at a temperature above the melting temperature of the polyolefin. In accordance with another aspect of the present invention, there is provided a security paper having an embedded security feature formed by the above method.
Brief description of the drawings
The above and other objects and features of the present invention will become apparent from the following description thereof, when taken in conjunction with the accompanying drawings wherein: Figure 1 exhibits a schematic representation of the method of manufacturing a security paper according to one embodiment of the present invention;
Figures 2 shows the cross-sectional side view of a composite film (30) composed of a print layer (33) , a hot- melt film layer (32) and a supporting base film layer (31) ;
Figure 3 illustrates an apparatus used in stinging a composite film (30) . - 3 - Detailed Description of the Invention
Referring to Figure 1, one preferred embodiment of the present invention may be conducted as follows using a Fourdrinier paper making machine (10) and a cylinder mould paper making machine (20) .
In the Fourdrinier machine, a fiber stock, a slurry of paper fibers, deposits onto a continuous moving wire mesh
(12) and a paper fiber web formed thereon passes through a preliminary wet press (11) to form a wet paper sheet (1) .
Another wet paper sheet (2) is prepared using the cylinder mould paper making machine (20) , wherein cylinder
(21) equipped with a wire mesh on its surface dips into a vat containing a fiber stock. As cylinder (21) rotates, paper fibers deposit on the mesh and wet paper sheet (2) is formed. Wet paper sheet (2) is couched from cylinder (21) by couch roll (22) .
In accordance with the present invention, polyolefin- based hot-melt film (3) bearing a printed security image in the form of a figure, character or pattern is introduced and inserted between two converging wet paper sheets (1 and 2) . The hot-melt film may be made of polyethylene, polypropylene, polybutene or polystyrene, polyethylene being the preferred. Subsequently, the converged wet paper sheets (1 and 2) with film (3) sandwiched therebetween pass through two sets of wet press (6) to remove excess water therefrom, and then, are dried and fused together by the adhesive action of molten polymer of film (3) over drying drum (4) heated at a temperature above the melting point of the hot-melt film, preferably 80 to 120 °C.
According to the present invention, film (3) comprises polyolefin layer (32) and print ink layer (33) (Fig. 2) . Film (3) is preferably very thin and has a thickness ranging from 10 to 25 μm.
Because polyolefin layer (32) is so thin, it does not have a sufficient tensile strength to support mechanical tension during a printing process to produce print layer (33) thereon. Accordingly, referring to Fig. 2, polyolefin layer (32) is laminated on reinforcing support layer (31) , a polyester, polyethylene or polypropylene layer having a thickness of about 30 μm, and, then, the reinforced polyolefin layer is subjected to a printing process to provide print layer (33) on polyolefin layer (32) , to form composite film (30) .
Then, composite film (30) may be preferably passed through roll (5) which has several sting needles (51) at regular intervals as shown in Fig. 3. This perforation treatment imparts good air permeability to film (3), which is beneficial in terms of enhancing drying of the sheets on the drying drum. The reinforcing support layer (31) is removed from composite (30) just before film (3) is introduced into the paper making apparatus shown in Fig. 1.
When the hot-melt layer of polyolefin melts on the drying drum, it is preferred that the ink of the print layer also melts to make imprints on the interface of the two paper sheets. A laroflex-based gravure ink thus may be preferably used because it has a melting point and expansion coefficient similar to that of a preferred hot-melt polyethylene resin. In accordance with the inventive method described above, a high-quality security paper containing an enhanced security feature can be conveniently prepared at a low production cost .
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

- 5 - What is claimed is:
1. A method of making a security paper having an embedded security feature in the form of a figure, character or pattern, which comprises, inserting a polyolefin film bearing a print ink layer of the security feature between two sheets of wet paper; pressing the sheets together; and heating the pressed sheets at a temperature above the melting point of the polyolefin.
2. The method of claim 1, wherein the polyolefin is a polyethylene having a melting point in the range of 80 to 120 ┬░C.
3. The method of claim 1, wherein the polyolefin film has a thickness ranging from 10 to 25 ╬╝m.
4. The method of claim 1, wherein the print ink layer comprises a laroflex-based gravure ink.
5. The method of claim 1, wherein the polyolefin film bearing the print ink layer is prepared by laminating a polyolefin layer on a reinforcing support layer, providing the print layer on the polyolefin layer, and removing the reinforcing support layer.
6. The method of claim 1, wherein the polyolefin film bearing the print ink layer is perforated at regular intervals .
7. A security paper having an embedded security feature made by a method as in any one of claims 1 to 6.
PCT/KR1999/000088 1998-04-16 1999-02-26 Security paper having embedded security feature and method of preparing same WO1999054550A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99906556A EP1080269B1 (en) 1998-04-16 1999-02-26 Security paper having embedded security feature and method of preparing same
DE69934979T DE69934979T2 (en) 1998-04-16 1999-02-26 Security paper having a security tag embedded therein and a method of manufacturing the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1998/13616 1998-04-16
KR1019980013616A KR100277221B1 (en) 1998-04-16 1998-04-16 Safety paper and its manufacturing method

Publications (1)

Publication Number Publication Date
WO1999054550A1 true WO1999054550A1 (en) 1999-10-28

Family

ID=19536319

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR1999/000088 WO1999054550A1 (en) 1998-04-16 1999-02-26 Security paper having embedded security feature and method of preparing same

Country Status (7)

Country Link
EP (1) EP1080269B1 (en)
KR (1) KR100277221B1 (en)
CN (1) CN1137309C (en)
DE (1) DE69934979T2 (en)
ES (1) ES2277428T3 (en)
RU (1) RU2188267C2 (en)
WO (1) WO1999054550A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2531584A (en) * 2014-10-23 2016-04-27 De La Rue Int Ltd Improvements in security papers and documents
EP1599346B2 (en) † 2003-02-27 2018-02-21 Landqart AG Multiple layer laminate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010017986A1 (en) 2010-04-21 2011-10-27 Giesecke & Devrient Gmbh Manufacturing security paper, useful for security documents, comprises bonding a security thread with paper layers, conducting further plastic layer in molten state between paper layers, and pressing paper layers between a pair of rollers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991007385A1 (en) * 1989-11-18 1991-05-30 Schering Agrochemicals Limited Preparation of propenoic acid derivatives
WO1992003296A1 (en) * 1990-08-27 1992-03-05 Eastman Kodak Company Three dimensional imaging paper
WO1995009947A1 (en) * 1993-10-02 1995-04-13 Graham Athey Signature filaments and security papers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991007385A1 (en) * 1989-11-18 1991-05-30 Schering Agrochemicals Limited Preparation of propenoic acid derivatives
WO1992003296A1 (en) * 1990-08-27 1992-03-05 Eastman Kodak Company Three dimensional imaging paper
WO1995009947A1 (en) * 1993-10-02 1995-04-13 Graham Athey Signature filaments and security papers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1599346B2 (en) † 2003-02-27 2018-02-21 Landqart AG Multiple layer laminate
GB2531584A (en) * 2014-10-23 2016-04-27 De La Rue Int Ltd Improvements in security papers and documents
GB2531584B (en) * 2014-10-23 2019-07-10 Portals De La Rue Ltd Improvements in security papers and documents

Also Published As

Publication number Publication date
RU2000128715A (en) 2004-03-20
CN1296539A (en) 2001-05-23
ES2277428T3 (en) 2007-07-01
CN1137309C (en) 2004-02-04
RU2188267C2 (en) 2002-08-27
KR19990080381A (en) 1999-11-05
DE69934979D1 (en) 2007-03-15
KR100277221B1 (en) 2001-01-15
DE69934979T2 (en) 2007-06-14
EP1080269A1 (en) 2001-03-07
EP1080269B1 (en) 2007-01-24

Similar Documents

Publication Publication Date Title
US7425245B2 (en) Fibrous sheets
FI69670C (en) FOERFARANDE FOER FRAMSTAELLNING AV FIBERARK
US4534398A (en) Security paper
US6616803B1 (en) Making paper
RU2386541C2 (en) Improvement of methods for manufacturing of protective substrates
KR100460378B1 (en) Anti-counterfeiting paper and its manufacturing method
CN1849426B (en) Planar security element
EP0033988A2 (en) Method of making a pattern densified fibrous web having spaced, binder impregnated high density zones
JP2000256994A (en) Windowed thread paper
EP1567713B1 (en) A method of manufacturing a fibrous substrate incorporating an elongate element with a variable edge profile
EP1080269B1 (en) Security paper having embedded security feature and method of preparing same
US5622109A (en) Process for producing a heat sensitive stencil sheet
EP2013415B1 (en) Security paper material, in particular for labelling and packaging, and manufacturing method thereof
US4941947A (en) Composite fibrous polyethylene sheet
US3215589A (en) Two ply printing paper and method of producing the same
EP1274564B1 (en) Engineered crack-resistant paper and board
KR100995543B1 (en) Improvements in fibrous sheets
KR100419382B1 (en) Method and apparatus for the preparation of the multiply paper thereof
CA2494465A1 (en) Papermachine belt
CN112406349B (en) Support for thermosensitive stencil sheet and thermosensitive stencil sheet
JP3155061B2 (en) Porous tissue paper for heat-sensitive stencil printing paper and method for producing the same
JP3776556B2 (en) Threaded forgery prevention paper manufacturing method

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 99805001.6

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): CN RU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1999906556

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 09673765

Country of ref document: US

WWP Wipo information: published in national office

Ref document number: 1999906556

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1999906556

Country of ref document: EP