WO1996006220A1 - Procede de fabrication d'un papier de securite comportant des zones localisees de faible opacite et papier ainsi obtenu - Google Patents
Procede de fabrication d'un papier de securite comportant des zones localisees de faible opacite et papier ainsi obtenu Download PDFInfo
- Publication number
- WO1996006220A1 WO1996006220A1 PCT/FR1995/001097 FR9501097W WO9606220A1 WO 1996006220 A1 WO1996006220 A1 WO 1996006220A1 FR 9501097 W FR9501097 W FR 9501097W WO 9606220 A1 WO9606220 A1 WO 9606220A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- paper
- sheet
- opacity
- thickness
- reduced
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/006—Making patterned paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/44—Watermarking devices
Definitions
- the invention relates to a method for manufacturing a paper comprising localized areas of low opacity with respect to the opacity of the rest of the paper.
- paper means any sheet obtained by the wet process using a suspension of natural cellulose fibers and / or synthetic fibers which may contain various fillers and various additives commonly used in stationery.
- Papers which are transparentized are already known in the prior art. These papers are for example made transparent by chemical compositions (see in particular French patent n ° 82 05124, filed on March 15, 1982 by ARJOMARI-PRIOUX). These papers are made transparent over their entire surface and are intended for applications for industrial design, reproduction of plans, etc.
- the light areas are due to the fact that the thickness of the sheet and the density of the fibers are lower in the light watermarks than the thickness of the sheet and the density of the fibers in areas where the watermark has not been imprinted.
- the dark areas are due to the fact that the thickness of the sheet and the density of the fibers are greater.
- Such watermarks have light parts which generally have areas of a few mm "and the variation in opacity between the light part of the watermark and the non-watermarked paper is small. If it is desired to print on the light areas of these watermarks, it is very difficult to match the light areas and the printing and even with very precise identification of the watermarks, it is difficult to obtain a good match.
- a security paper comprising zones of reduced opacity, at well defined and well-located places, the zones making it possible to see by transmission, with the naked eye, impressions carried on the face opposite to the face on which we are looking at the paper .
- the zones can, for example, be produced in the form of a watermark by using methods of round shape or with watermark rollers.
- the sheet of paper obtained according to this process is such that the zone having a reduced thickness has a thickness less than 40% of the thickness of the rest of the sheet.
- the sheet can also be such that said zone has an average opacity less than 40% of the opacity of the rest of the sheet.
- a first layer of paper is formed on a canvas of a first wet part of a paper machine
- a second layer of paper is formed on a canvas of a second wet part of a paper machine
- One or even two layers of paper can be produced without problem so as to be locally very thin, at least one of the layers of paper in a region being reduced locally so that the overall thickness of the two layers is sufficiently reduced to get good transparency.
- the object of the invention is therefore to provide a method for manufacturing a paper comprising localized zones of low opacity, these zones having a uniform air and opacity.
- the invention relates to a method of manufacturing a sheet of paper comprising at least one zone of reduced opacity relative to the opacity of the rest of the sheet and having a area of at least 0.4 cm * , by placing on an embossed canvas, possibly arranged on a round shape, an aqueous dispersion containing at least cellulosic fibers, by draining the water to form the sheet, whether or not d '' a watermarking roll, by recovering the sheet formed on a lifting cloth and drying, the process being such that the watermarked cloth is crimped, that is to say that the thickness of the cloth is reduced in the part embossed, in order to reduce the void between the meshes of the canvas, and therefore to reduce the size of the meshes.
- the thickness of the embossed part is reduced, riu ticr ⁇ nu q ⁇ n ⁇ T j preferably by half.
- the final thickness of the embossed part is between 0.3 and 0.16 mm for an initial thickness of 0.46 mm
- the height H of the embossing is between 0.3 and 1.5 mm, preferably 0.8 mm and the embossing angle is between 2 and 6 °.
- a paper is obtained according to the process of the invention, the difference in opacity between the sheet and the zone of reduced opacity is between 2 and 6, preferably 4, this difference being measured according to a correlation method between the density of paper fibers and opacity of paper.
- a paper is obtained having at least one zone of reduced opacity, the trace of the crimped zone appearing on one face of the zone of reduced opacity, while the trace of the lifting fabric appears on the other side of the area.
- Figure 1 is a view of a round machine for the production of paper according to the invention.
- Figure 2 is an enlarged sectional view of the watermarked fabric, at the embossing.
- FIG. 3 is an enlarged top view of the watermarked fabric.
- a round shape machine used to make security paper and more particularly paper for banknotes.
- an aqueous suspension 1 of cellulose fibers is produced in which a round shape 2 is made to rotate, namely a cylinder made up of several superimposed grids including a filigree grid or canvas 3 which is embossed, that is to say say which includes embossings such as that shown at 6 in FIG. 2.
- the aqueous suspension 1 is deposited on the round shape 2 to form a sheet 4 which is raised using a lifting fabric shown diagrammatically at 5. From does embossing, it deposits fewer fibers on them and the paper then has clear watermarks.
- FIG 3 there is shown a part of embossed canvas, in section.
- the fabric 3 has an embossing height H and an initial thickness ei. Because the fabric is crimped, at the level of the embossing, the final thickness e 2 of the fabric is less than its initial thickness ei.
- a tool which comprises a head whose profile corresponds to the shape of the desired embossing and this head is applied to the canvas by firstly tightening the canvas and applying other share the crimping head while exerting pressure.
- the size of the initial meshes Mi is reduced and the meshes M 2 , after crimping, are more tightened.
- the space inside a mesh M 2 (or void of mesh) is less than the void of a mesh Mi.
- the water drainage in the crimped part is reduced compared to the water drips in the uncrimped part, and a clear watermark forms. But due to the crimping, we obtain a regularity of the M-wings M 2 and this in a surprising way. Thus the drainage through the crimped part will be regular and the look of the clear watermark will be regular.
- the thickness e 2 of the embossed part is between 0.3 and 0.16 mm
- the height H of the embossing is between 0.3 and 1.5 mm, preferably 0.8 mm
- the embossing angle ⁇ which is formed by the side 7 of the embossing and the axis xx perpendicular to the canvas is preferably between 2 and 6 °.
- Example 1 A paper is made using a round shape, this paper having a dry weight of 70 to 87 g / m 2 .
- An embossing of height 0.8 mm is carried out and this embossing has a circular profile of 2 cm in diameter. Different crimps of thickness e 2 are carried out on a fabric having a thickness ei of 0.46 mm and the difference in opacity is measured between the zones of reduced opacity and the rest of the sheet.
- Crimping at 0.3 mm does not give sufficient reduced opacity, crimping at 0.16 mm results in the formation of a hole in the paper sheet. Only crimping at 0.2 mm gives an opacity difference of 4 which is considered to be correct.
- the zone of reduced opacity has a regular appearance.
- the trace of the crimped area we see the trace of the lifting fabric.
- the embossed grid and the lifting fabric have different meshes, those skilled in the art readily recognize them.
- Opacity differences are measured as follows: an EEL opacimeter from the company Diffusion Systems Ltd (Great Britain) is used. This opacimeter has a read head that lights up the paper. We note the opacity of the sheet. However, this read head has a larger diameter than the zone of reduced opacity of the sheet according to the invention. We cannot therefore measure the opacity of this area directly. We therefore proceed by correlation by measuring the density of different leaves without reduced areas and by measuring its opacity.
- the opacity of a zone of reduced opacity When it is desired to measure the opacity of a zone of reduced opacity according to the invention, its density is measured and by correlation its opacity is obtained. Thus, the difference in opacity is calculated between the zone of reduced opacity and the rest of the sheet.
- zones of reduced opacity according to the invention can have any desired shape, round, oval, etc. and can be of different sizes.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9703697A GB2306178B (en) | 1994-08-24 | 1995-08-17 | Method for making security-type paper comprising localized zones of low opacity and paper obtained in this way |
DE19581738T DE19581738T1 (de) | 1994-08-24 | 1995-08-17 | Verfahren zur Herstellung von Sicherheitspapier, das örtlich begrenzte Bereiche geringerer Opazität umfaßt, und so erhaltenes Papier |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9410242A FR2723971B1 (fr) | 1994-08-24 | 1994-08-24 | Procede de fabrication d'un papier de securite comportant des zones localisees de faible opacite et papier ainsi obtenu |
FR94/10242 | 1994-08-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996006220A1 true WO1996006220A1 (fr) | 1996-02-29 |
Family
ID=9466462
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1995/001097 WO1996006220A1 (fr) | 1994-08-24 | 1995-08-17 | Procede de fabrication d'un papier de securite comportant des zones localisees de faible opacite et papier ainsi obtenu |
Country Status (7)
Country | Link |
---|---|
BE (1) | BE1008682A3 (fr) |
DE (1) | DE19581738T1 (fr) |
FR (1) | FR2723971B1 (fr) |
GB (1) | GB2306178B (fr) |
IT (1) | IT1280922B1 (fr) |
NL (1) | NL1001049C2 (fr) |
WO (1) | WO1996006220A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100376748C (zh) * | 2004-12-29 | 2008-03-26 | 孙显林 | 一种防伪材料 |
FR2925534A1 (fr) * | 2007-12-24 | 2009-06-26 | Arjowiggins Licensing Soc Par | Structure de securite comportant des cristaux liquides nematiques |
US8449719B2 (en) | 2007-12-28 | 2013-05-28 | Arjowiggins Security | Security paper |
CN104611976A (zh) * | 2015-01-04 | 2015-05-13 | 昆山钞票纸业有限公司 | 带水印支撑结构的网笼及其制造的防伪纸 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2804447B1 (fr) | 2000-02-01 | 2002-04-05 | Arjo Wiggins Sa | Papier comportant un filigrane a effet multiton et toile pour fabriquer ce papier |
FR2804448B1 (fr) | 2000-02-01 | 2002-04-05 | Arjo Wiggins Sa | Papier de securite comportant une zone de securite, procede pour realiser un tel papier et dispositif pour mettre en oeuvre ce procede |
FR2839917B1 (fr) * | 2002-05-22 | 2004-10-08 | Arjo Wiggins | Article forme a partir d'au moins un jet de matiere fibreuse comportant au moins une zone d'epaisseur nulle et procede de fabrication dudit article |
CN100360740C (zh) * | 2005-12-23 | 2008-01-09 | 中国印钞造币总公司 | 高定量水印防伪纸的制作方法 |
CH709680A1 (de) * | 2014-05-21 | 2015-11-30 | Landqart Ag | Entwässerungssieb für die Herstellung von Papier mit wenigstens einem Wasserzeichen und damit hergestelltes Papier mit einem Wasserzeichen. |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE238640C (fr) * | 1900-01-01 | |||
DE623516C (fr) * | 1900-01-01 | |||
US1616222A (en) * | 1922-05-18 | 1927-02-01 | American Writing Paper Company | Fourdrinier-wire screen |
CH244613A (de) * | 1945-05-25 | 1946-09-30 | Reinhardt Erwin | Einrichtung an Papiermaschinen zur Herstellung von in der Durchsicht durch das Papier gegenüber demselben dunkler erscheinenden Wasserzeichen. |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2684698B1 (fr) * | 1991-12-09 | 1994-01-21 | Arjo Wiggins Sa | Procede pour la fabrication d'un produit comportant des zones localisees d'opacite reduite et papier ainsi obtenu. |
-
1994
- 1994-08-24 FR FR9410242A patent/FR2723971B1/fr not_active Expired - Fee Related
-
1995
- 1995-08-17 DE DE19581738T patent/DE19581738T1/de not_active Withdrawn
- 1995-08-17 GB GB9703697A patent/GB2306178B/en not_active Expired - Fee Related
- 1995-08-17 WO PCT/FR1995/001097 patent/WO1996006220A1/fr not_active Application Discontinuation
- 1995-08-23 IT IT95TO000699A patent/IT1280922B1/it active IP Right Grant
- 1995-08-24 NL NL1001049A patent/NL1001049C2/xx not_active IP Right Cessation
- 1995-08-24 BE BE9500710A patent/BE1008682A3/fr not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE238640C (fr) * | 1900-01-01 | |||
DE623516C (fr) * | 1900-01-01 | |||
US1616222A (en) * | 1922-05-18 | 1927-02-01 | American Writing Paper Company | Fourdrinier-wire screen |
CH244613A (de) * | 1945-05-25 | 1946-09-30 | Reinhardt Erwin | Einrichtung an Papiermaschinen zur Herstellung von in der Durchsicht durch das Papier gegenüber demselben dunkler erscheinenden Wasserzeichen. |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100376748C (zh) * | 2004-12-29 | 2008-03-26 | 孙显林 | 一种防伪材料 |
FR2925534A1 (fr) * | 2007-12-24 | 2009-06-26 | Arjowiggins Licensing Soc Par | Structure de securite comportant des cristaux liquides nematiques |
WO2009081035A2 (fr) * | 2007-12-24 | 2009-07-02 | Arjowiggins Licensing | Structure de securite comportant des cristaux liquides nematiques |
WO2009081035A3 (fr) * | 2007-12-24 | 2009-10-08 | Arjowiggins Licensing | Structure de securite comportant des cristaux liquides nematiques |
US8397995B2 (en) | 2007-12-24 | 2013-03-19 | Arjowiggins Security | Security structure including nematic liquid crystals |
US8449719B2 (en) | 2007-12-28 | 2013-05-28 | Arjowiggins Security | Security paper |
CN104611976A (zh) * | 2015-01-04 | 2015-05-13 | 昆山钞票纸业有限公司 | 带水印支撑结构的网笼及其制造的防伪纸 |
Also Published As
Publication number | Publication date |
---|---|
GB9703697D0 (en) | 1997-04-09 |
IT1280922B1 (it) | 1998-02-11 |
BE1008682A3 (fr) | 1996-07-02 |
NL1001049C2 (nl) | 1996-04-22 |
FR2723971A1 (fr) | 1996-03-01 |
GB2306178B (en) | 1998-04-29 |
ITTO950699A1 (it) | 1997-02-23 |
FR2723971B1 (fr) | 1996-10-04 |
GB2306178A (en) | 1997-04-30 |
DE19581738T1 (de) | 1997-07-24 |
NL1001049A1 (nl) | 1996-02-26 |
ITTO950699A0 (it) | 1995-08-23 |
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