EP1135556B1 - Papier non couche comportant un pseudo-filigrane et procede de fabrication - Google Patents
Papier non couche comportant un pseudo-filigrane et procede de fabrication Download PDFInfo
- Publication number
- EP1135556B1 EP1135556B1 EP99973085A EP99973085A EP1135556B1 EP 1135556 B1 EP1135556 B1 EP 1135556B1 EP 99973085 A EP99973085 A EP 99973085A EP 99973085 A EP99973085 A EP 99973085A EP 1135556 B1 EP1135556 B1 EP 1135556B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper
- areas
- area
- uncoated
- rest
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 51
- 238000003490 calendering Methods 0.000 claims description 19
- 230000009467 reduction Effects 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 238000007641 inkjet printing Methods 0.000 claims description 7
- 239000000080 wetting agent Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 5
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000007850 fluorescent dye Substances 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- 239000004150 EU approved colour Substances 0.000 claims 2
- 229940006093 opthalmologic coloring agent diagnostic Drugs 0.000 claims 2
- 230000001476 alcoholic effect Effects 0.000 claims 1
- 239000006081 fluorescent whitening agent Substances 0.000 claims 1
- 238000009736 wetting Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000000123 paper Substances 0.000 description 132
- 239000000975 dye Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 239000000049 pigment Substances 0.000 description 6
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000003086 colorant Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008707 rearrangement Effects 0.000 description 2
- 230000033458 reproduction Effects 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 235000015067 sauces Nutrition 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/10—Watermarks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/24—Pressing or stamping ornamental designs on surfaces
-
- 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
- D21H27/02—Patterned paper
-
- 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
-
- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
-
- 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
-
- 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 an uncoated paper comprising at least one pseudo-watermark consisting of a mark giving the said paper a visual effect and a texture resembling that of a watermark.
- the present invention also relates to a method for manufacturing a non-paper coated according to the invention.
- Watermarked papers are generally used in the field of security papers such as means of payment such as banknotes or checks, check letters and official documents like passports, identity cards, stamped papers, notarial acts, or entry tickets to cultural or sporting events because the presence of the watermark limits the possibilities of photocopying and counterfeiting, and offers a means of recognizing and / or authenticating said paper.
- the papers watermarks are also used in the field of personalized company papers in using the company's logo, name or brand as a watermark. he can it turns out that these watermarked papers are requested in very small tonnages and / or in short manufacturing times.
- W097 / 17493 describes papers coated with pseudo-watermarks resulting from a variation in the layer weight applied in specific areas which induces a variation in thickness and opacity in the said zones where the layer weight is reduced or increased.
- An object of the present invention is to provide uncoated paper having pseudo-watermarks consisting of marks which locally modify the physical characteristics of the paper such as its mass volume and therefore certain properties such as its thickness and possibly its opacity.
- Another object of the present invention is to provide an uncoated paper having pseudo-watermarks consisting of marks which create a shade contrast with the rest of the sheet of paper.
- Another object of the present invention is to provide an uncoated paper comprising pseudo-watermarks produced without using a varnish on its surface so that the composition of the paper in the areas constituting the pseudo-watermark is not significantly changed.
- Another object of the present invention is to provide uncoated paper with pseudo-watermarks whose usage properties, in particular printability properties in the areas of the paper surface corresponding to the said marks, are not significantly altered compared to other areas not marked by a so-called pseudo paper watermark.
- Another object of the present invention is to provide an uncoated paper having pseudo-watermarks that can be manufactured in variable and small quantities in more economical conditions than by the processes of the prior art and which can be obtained in widths and quantities independent of the characteristics of the paper machine, in particular by a process whose implementation of the machines does not modify the operation of actual paper manufacturing.
- Another object of the present invention is to provide an uncoated paper having a pseudo-watermark in which said watermark is produced after the last operation of manufacturing, that is to say at the end of the drying season, possibly on the finished paper, that is to say off-line manufacturing.
- the present invention provides an uncoated paper comprising at least a mark resembling a watermark characterized in that one or more determined area (s) of paper have a reduction in thickness compared to the rest of uncoated paper, the areal mass in said area or areas of the paper being identical to that of the rest of the paper, according to claim 11.
- the grammages are identical in the said zone or zones and in the rest of the paper, it being understood that the variation in weight which may result from the presence of an additive not evaporated from the rewetting solution is not significant.
- the one or more zones have a reduction in opacity compared to the rest of the paper.
- the said zone or zones have a color in particular a shade and / or a brightness, different from that of the rest of the paper.
- the paper may have a reduction in thickness and opacity in the said zone or zones relative to the rest of the paper.
- the paper may have, in the said zone or zones, agents chosen from coloring agents, fluorescent agents, agents inhibiting fluorescence, agents allowing recognition or authentication. These agents may have been deposited by incorporating the rewetting solution, described below, containing them and remaining after evaporation of the solution. Anti-forgery agents or are well known to those skilled in the art in the field of papers fiduciary and security.
- the paper can comprise two or more fibrous jets.
- only one of the surface jets has a reduction in thickness and / or a difference of shade and / or luminosity in the said zone or zones relative to the rest of the multijet paper.
- the paper can comprise two or more sheets of paper laminated.
- the lamination adhesive is colored. In a mode of only a sheet of laminated paper has a reduction in thickness and / or a difference in shade and / or difference in brightness in the said zone or zones with respect to to the rest of the laminated paper.
- uncoated paper means that the paper is not coated with a pigmented layer comprising at least fine mineral pigments, in particular kaolin and / or calcium carbonate, and at least one binder or adhesive. , in particular starch or latex, as well as, optionally, any additives commonly used by those skilled in the art, the function of which is to improve the rheological properties of the sauce and to confer particular properties on the layer.
- the paper can be impregnated or surface treated with a non-pigmented composition such as a sizing composition, in particular to improve its printability, and / or its mechanical resistance and / or its resistance to soiling and / or its bactericidal properties.
- rewetted paper is meant that, in the said zone or zones, the rewetting solution has penetrated inside the paper and has not yet evaporated.
- said rewetting solution is evaporated and the paper is densified in the areas where said solution was initially applied. This results in an increase in the density of the paper in said areas relative to the rest of the sheet of paper and more precisely a reduction in thickness with a surface mass identical to that of the rest of the paper.
- Said zones can then present an opacity contrast (reduction of opacity) and / or a color contrast, in particular of color nuance and brightness with the rest of the sheet of paper.
- the opacity of the paper is partly linked to the presence of air in the fibrous interstices and / or paper pigments.
- the solution replaces the air in said interstices.
- the solution is evaporated and the fibers and / or the pigments being densified, the air gaps generally occupy a reduced volume and in particular are found in smaller quantities than initially, which generates a disseminationopacification.
- the densification of the paper comes from a reduction in thickness of the treated areas compared to the rest of the paper, the surface mass remaining constant relative to the rest of the paper.
- the surface mass is less in the areas clear because the fibers deposited are in smaller quantity compared to the rest of the sheet.
- the surface mass is not constant because the weight of the layer is reduced in certain areas.
- Rewetting the paper facilitates rearrangement of the fibers and / or pigments during calendering.
- There may be additives in the rewetting solution which facilitate the rearrangement of fibers and / or pigments and / or which favor the greater or lesser penetration of said solution into the paper.
- the method of the present invention can also create a modification of the color of the paper in said zone or zones when said rewetting solution comprises a coloring agent, in particular a tinting coloring agent.
- a coloring agent in particular a tinting coloring agent.
- the color contrast in the said zone or zones may also result from the modification of the opacity in one of the surface jets when it exists a difference in shade initially between said surface jet and the jet linked to it.
- the method according to the present invention applies to all uncoated, white papers or colored, without limitation of grammage, possibly laminated or multijet.
- step (b) said pressure and said heat by calendering the paper.
- the calender rollers can be heated but in any event the friction produced by the grille generates heat.
- the calendering operation is carried out according to the present invention with calenders known to those skilled in the art.
- the calenders can be of the supercalender, soft calender (also called elastic) or smooth type. They consist of several rollers, the number and nature of the material constituting them vary depending on the purpose and the paper to be treated.
- the goal is to flatten the paper surfaces, by more or less strong compression of the sheet between the rollers and by the more or less large extent of the contact area between the rollers and the sheet, in order to give them a certain "Smoothed" as well as a certain softness to the touch and a good aptitude for writing and printing.
- the ridges and reliefs are flattened more or less strongly at the time of the passage between the rollers and the sheet is densified.
- the purpose of calendering can also be to make the surfaces shiny or satin.
- the calender rolls are made of hardened cast iron or steel, some of which can be covered with a fabric, cardboard or plastic for example to make elastic rollers.
- the supercalender which has a large number of rollers (of the order of 12 or more) is often located outside the machine because of maintenance, changing of the rollers and sheet breaks.
- the soft grille can be located on the paper machine, the number of rollers is lower and some are elastic.
- the boom is located on a machine and has a few rollers often made of steel and is not covered.
- the linear pressure exerted between the rollers on the paper is of the order of 0.5 to 5000 kN / cm.
- the temperature of the rollers when heated can be 50 to 300 ° C.
- the different parameters of the calendering such as temperature, hardness of the rollers, possibly coating of rollers, the extent of the contact area between the rollers and the sheet as well as the pressure are chosen according to the nature of the desired final contrast.
- These different parameters are adapted according to the calendering speed, which is controlled by the speed application of the rewetting solution.
- a calender is used comprising 2 to 6 rolls and if necessary with a plastic coating (for its impermeability to rewetting solution).
- the mark can correspond to the said zone or zones and constitute a given pattern appearing in positive contrast with respect to the rest of the sheet of paper not rewetted.
- the given pattern can appear by contrast in negative since the mark would correspond to the remainder of the sheet of paper not treated, i.e. not rewetted initially.
- the said zone or zones may define a visual pattern in observation in transmitted light resulting from a reduction opacity in the said zone or zones.
- the said zone or zones can also define a visual pattern by observation in reflected light resulting from a difference in color of said one or more areas.
- said mark corresponds to the said area or areas treated
- step (a) is carried out on the off-line production paper, that is to say on the finished paper.
- the rewetting solution according to the invention can be applied using a rotogravure device comprising a rotogravure cylinder whose imprints or hollow cells, have a shape such that they make it possible to apply said solution of rewetting according to a pattern corresponding to said mark in said zone or zones.
- the rewetting solution is applied using a device of the type of those used in inkjet printing processes, in particular the processes inkjet printing on a reel, it being understood that said ink is replaced by said aqueous rewetting solution.
- Inkjet printing devices, especially digital inkjet printing devices allow brands to be created according to various patterns that can be changed quickly and inexpensively from one manufacturing to another other.
- Said rewetting solution may advantageously comprise a wetting agent so as to improve or accelerate the penetration of the solution into the paper.
- Said wetting agent may be advantageous, in particular according to the characteristics of the paper, in particular its porosity and the possible presence or not in it of a wetting agent and also according to the amount of re-wetting solution applied. By way of illustration, a quantity of 2 to 20 g / m 2 of rewetting solution can be applied.
- said rewetting solution is a solution of a polar solvent hydrophilic.
- wetting agent it is possible in particular to use ethanol or 2-pyrrolidone.
- the rewetting solution is an aqueous solution, the use of a non-aqueous solvent inducing additional costs and risks of pollution.
- water without a wetting agent as an aqueous rewetting solution, in particular in the case of very porous paper and / or which includes wetting agents and / or special pigments with a high capacity absorption of water in its composition, like certain silicas.
- the rewetting solution may also contain additives such as as dyes, in particular shading dyes, fluorescent agents whiteners (optical brighteners) or, conversely, fluorescence inhibitors as well that all additives known to those skilled in the art to allow recognition or authentication of so-called security papers.
- the rewetting solution can contain a colorless anti-forgery agent or authentication agent capable of being revealed by reaction with a specific co-reactant or under specific conditions.
- a Hewlett Packard Deskjet 560 C desktop printer is used equipped with a cartridge reference 51626A previously emptied of its ink, cleaned then filled with a rewetting solution consisting distilled water and 2% volume of ethanol, in order to rewet the papers below.
- the marks are positive, unless otherwise specified, and the quantity of rewetting solution provided, for a rewetted solid color with a resolution of 600 ⁇ 300 dots per inch, and the so-called “coarse” screening conditions, so-called “mail” and so-called “normal” intensity control quality is around 12 g / m2.
- the papers, immediately rewetted, are passed through a laboratory calender with two rollers heated to 50 ° C, under a linear pressure of 3.0 kN / cm.
- EXAMPLE 3 OPACITY CONTRAST AND COLOR GAP (SHADE AND BRIGHTNESS)
- the motif is reproduced in two different places, according to a photograph of an identity of a person, according to the general conditions mentioned above, however for one of the reproductions (a), the dark parts of the photograph were made by rewetting, and for the other reproduction (b), the light parts of the photograph were rewetted, thus appearing in negative.
- the paper thus obtained is a security paper personalized by the double pseudo-watermark of the identity photograph that we recognize By direct vision, in reflected light, in the form of shade contrast, we observe (a).
- An uncoated 170 g / m 2 bijet paper is produced on a laboratory form.
- One of the jets is white and has a grammage of 90 g / m 2 and the other jet is of green shade and also has a grammage of 80 g / m 2
- An uncoated laminated paper of 210 g / m 2 is produced by laminating two uncoated white papers having a grammage of 90 g / m 2 using an adhesive based on poly (vinyl acetate) and comprising 3% by weight of a shading dye, VIOLET BB 200%.
- the pseudofiligrane is produced as in Example 7.
- a paper is obtained having marks according to the pattern similar to a translucent watermark but it has better visibility in transmitted light, because the amount of dye is less than that from example 7.
- the rewetting solution consists of distilled water and 2% by weight of 2-pyrrolidone (98% purity). After calendering at 50 ° C a paper similar to that of Example 3, under a linear pressure of 1.0 kN / cm, a paper is obtained with a pseudo-watermark in accordance with the invention, by shade contrast and opacity.
- a SCITEX 6240 inkjet printer printhead was installed one meter from the calender rollers. Printing and calendering speed are synchronized.
- As a rewetting solution for the paper a mixture of demineralized water and 5% by volume of ethanol is used.
- the grille consists of two rollers; one is made of steel and the counter roller has a plastic covering. These rollers are heated to 80 ° C and the linear pressure between the rollers is 2.5 kN / cm.
- the coil is unwound from a sheet of white paper, a pattern is made with the rewetting solution using the print head on the sheet, then the said sheet is passed between the two rolls of the calender.
- the running speed of the paper sheet is 20 m / min.
- the dry paper sheet has a thickness of 60 ⁇ m and has been densified in the rewetting zones by a thickness reduction of 16 ⁇ m.
- a paper is obtained with a pseudo-watermark according to the invention, by reduction of thickness.
Landscapes
- Paper (AREA)
- Credit Cards Or The Like (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Description
En revanche, le papier peut être imprégné ou traité en surface avec une composition non pigmentée telle qu'une composition d'encollage, notamment pour améliorer son imprimabilité, et/ou sa résistance mécanique et/ou sa résistance à la salissure et/ou ses propriétés bactéricide.
Selon la présente invention par « papier remouillé » on entend que, dans la ou lesdites zones, la solution de remouillage a pénétré à l'intérieur du papier et n'est pas encore évaporée.
Selon la présente invention, en exerçant une pression sur toute la feuille de papier non couché ou seulement sur lesdites zones et en augmentant la température du papier, ladite solution de remouillage est évaporée et le papier est densifié dans les zones où ladite solution a été initialement appliquée. Il en résulte une augmentation de la masse volumique du papier dans lesdites zones par rapport au reste de la feuille-de papier et plus précisément une réduction d'épaisseur avec une masse surfacique identique à celle du reste du papier. Lesdites zones peuvent présenter alors un contraste d'opacité (réduction d'opacité) et/ou un contraste de couleur notamment de nuance de couleur et de luminosité avec le reste de la feuille de papier.
Les rouleaux des calandres sont en fonte trempée ou en acier dont certains peuvent être recouverts d'un tissu, d'un carton ou d'une matière plastique par exemple pour faire des rouleaux élastiques. La supercalandre, qui comporte un grand nombre de rouleaux (de l'ordre de 12 ou plus) est souvent située hors machine à cause de l'entretien, du changement des rouleaux et des ruptures de feuille. La calandre molle peut être située sur la machine à papier, le nombre de rouleaux est plus faible et certains sont élastiques. La lisse est située sur machine et comporte quelques rouleaux souvent en acier et ne sont pas recouverts.
La pression linéaire exercée entre les rouleaux sur le papier est de l'ordre de 0,5 à 5000 kN/cm. La température des rouleaux lorsqu'ils sont chauffés peut être de 50 à 300°C.
Les papiers aussitôt remouillés sont passés dans une calandre de laboratoire à deux rouleaux chauffés à 50°C, sous une pression linéaire de 3,0 kN/cm.
Par vision directe, en lumière réfléchie, sous forme de contraste de nuance, on observe (a). Par observation en lumière transmise, on observe (b) sous forme de contraste d'opacité (zones remouillées devenues moins opaques et donc plus claires), étant compris qu'à l'inverse, (a) en lumière transmise et (b) en vision directe en lumière réfléchie sont chacune perçue comme une empreinte du négatif de la photographie d'identité.
Après calandrage à 50°C d'un papier similaire à celui de l'exemple 3, sous une pression linéaire de 1,0 kN/cm, on obtient un papier avec un pseudo-filigrane conformément à l'invention, par contraste de nuance et opacité.
On déroule la bobine d'une feuille de papier blanc, on réalise un motif avec la solution de remouillage à l'aide de la tête d'impression sur la feuille, puis on fait passer ladite feuille entre les deux rouleaux de la calandre. La vitesse de défilement de la feuille de papier est de 20 m/mn.
La feuille de papier sec a une épaisseur de 60 µm et a été densifiée dans les zones de remouillage par une réduction d'épaisseur de 16 µm. On obtient un papier avec un pseudo-filigrane conformément à l'invention, par réduction d'épaisseur.
Claims (19)
- Procédé de fabrication d'un papier non couché, comportant au moins une marque ressemblant à un filigrane caractérisé en ce qu'on réalise ladite marque après l'étape de séchage du papier, en effectuant les étapes dans lesquelles ;a) on applique une solution de remouillage sur au moins une face du papier non couché, dans une ou des zones déterminées, puisb) on applique une pression et une chaleur dans la ou lesdites zones du papier remouillé de manière à évaporer ladite solution et densifier le papier non couché dans la ou lesdites zones par rapport au reste du papier, en appliquant lesdites pression et chaleur sur toute la surface de la feuille.
- Procédé selon la revendication 1, caractérisé en ce qu'à l'étape a) ladite solution de remouillage est appliquée à l'aide d'un dispositif d'impression par jet d'encre sur papier. notamment un dispositif d'impression numérique par jet d'encre, dans lequel on remplace l'encre par ladite solution de remouillage.
- Procédé selon la revendication 1 à 2, caractérisé en ce que à l'étape b) on applique ladite pression et ladite chaleur en effectuant un calandrage du papier non couché.
- Procédé selon l'une des revendications 1 à 3, caractérisé en ce que ladite solution de remouillage est une solution aqueuse.
- Procédé selon l'une des revendications 1 à 4, caractérisé en ce que ladite solution de remouillage comporte des additifs choisis parmi des agents mouillants, des agents colorants notamment des agents de nuançage, des agents fluorescents blanchissants, des agents inhibiteurs de fluorescence, des agents antifalsitication ou d'authentification.
- Procédé selon la revendication 4, caractérisé en ce que ladite solution aqueuse est une solution hydroalcoolique.
- Procédé selon l'une des revendications 4 à 6, caractérisé en ce que ladite solution aqueuse contient de 1 à 10% en volume d'éthanol dans de l'eau.
- Procédé selon la revendication 4 ou 5, caractérisé en ce que ladite solution aqueuse contient de 1 à 10 % en poids de 2-pyrrolidone dans de l'eau.
- Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la ou lesdites zones définissent un motif visuel en observation en lumière transmise résultant d'une réduction d'opacité dans la ou lesdites zones.
- Procédé selon l'une des revendications 1 à 9, caractérisé en ce que la ou lesdites zones définissent un motif visuel en observation en lumière réfléchie résultant d'une différence de couleur dans la ou lesdites zones.
- Papier non couché comportant au moins une marque ressemblant à un filigrane, et correspondant à une ou des zones déterminées du papier non couché présentant une réduction d'épaisseur par rapport au reste du papier non couché, caractérisé en ce que la masse surfacique dans la ou lesdites zones du papier est identique à celle du reste du papier, et qu'il est obtenu par le procédé selon l'une des revendications 1 à 10.
- Papier non couché selon la revendication 11, caractérisé en ce que la ou lesdites zones présentent une réduction d'opacité par rapport au reste du papier.
- Papier non couché selon l'une des revendications 11 ou 12, caractérisé en ce que la ou lesdites zones présentent une couleur, et notamment une nuance et/ou une luminosité, différente de celle du reste du papier.
- Papier non couché selon l'une des revendications 11 à 13, caractérisé en ce que la ou lesdites zones comportent des agents choisis parmi des agents colorants, des agents fluorescents, des agents inhibiteurs de fluorescence, des agents antifalsification ou d'authentification.
- Papier non couché selon l'une des revendications 11 à 14, caractérisé en ce qu'il comporte deux ou plusieurs jets fibreux.
- Papier non couché selon la revendication précédente, caractérisé en ce que seul l'un des jets de surface présente une réduction d'épaisseur et/ou une différence de nuance et/ou de luminosité dans la ou lesdites zones par rapport au reste du papier multijet.
- Papier non couché selon l'une des revendications 11 à 16, caractérisé en ce qu'il comporte deux ou plusieurs feuilles de papier contrecollées.
- Papier non couché selon la revendication précédente, caractérisé en ce que la colle de contrecollage est colorés.
- Papier selon les revendications 17 ou 18 caractérisé en ce que seule l'une des feuilles du papier contrecollé présente une réduction d'épaisseur et/ou une différence de nuance et/ou une différence de luminosité dans la ou lesdites zones par rapport au reste du papier contrecollé.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9815183 | 1998-12-01 | ||
| FR9815183A FR2786510B1 (fr) | 1998-12-01 | 1998-12-01 | Papier non couche comportant un pseudo-filigrane et procede de fabrication |
| PCT/FR1999/002947 WO2000032874A1 (fr) | 1998-12-01 | 1999-11-29 | Papier non couche comportant un pseudo-filigrane et procede de fabrication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1135556A1 EP1135556A1 (fr) | 2001-09-26 |
| EP1135556B1 true EP1135556B1 (fr) | 2003-04-09 |
Family
ID=9533468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99973085A Expired - Lifetime EP1135556B1 (fr) | 1998-12-01 | 1999-11-29 | Papier non couche comportant un pseudo-filigrane et procede de fabrication |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1135556B1 (fr) |
| AT (1) | ATE237030T1 (fr) |
| AU (1) | AU1391600A (fr) |
| BR (1) | BR9915844A (fr) |
| DE (1) | DE69906789D1 (fr) |
| FR (1) | FR2786510B1 (fr) |
| WO (1) | WO2000032874A1 (fr) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2861101B1 (fr) * | 2003-10-15 | 2007-06-15 | Arjo Wiggins | Papier de securite multijet |
| WO2009124581A1 (fr) | 2008-04-07 | 2009-10-15 | Sca Hygiene Products Ab | Produit hygiénique ou de type lingette comprenant au moins une couche à motif et procédé de création du motif sur la couche |
| FR3022489B1 (fr) | 2014-06-23 | 2021-10-29 | Arjowiggins Security | Papiers de securite et procedes de fabrication. |
| TW201700831A (zh) * | 2015-04-06 | 2017-01-01 | Seiko Epson Corp | 片材製造裝置及片材製造方法 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4824486A (en) * | 1985-11-04 | 1989-04-25 | Westvaco Corporation | Simulated watermark printing system |
| SE505397C2 (sv) * | 1995-11-09 | 1997-08-18 | Mo Och Domsjoe Ab | Ytbehandlat säkerhethetspapper och förfarande samt anordning för framställning av ytbehandlat säkerhetspapper |
| DE29714004U1 (de) * | 1997-08-06 | 1997-11-06 | Beckenlehner, Karin, 93053 Regensburg | Mittel zum Tintenstrahldruck künstlicher Wasserzeichen |
-
1998
- 1998-12-01 FR FR9815183A patent/FR2786510B1/fr not_active Expired - Fee Related
-
1999
- 1999-11-29 DE DE69906789T patent/DE69906789D1/de not_active Expired - Lifetime
- 1999-11-29 WO PCT/FR1999/002947 patent/WO2000032874A1/fr not_active Ceased
- 1999-11-29 BR BR9915844-2A patent/BR9915844A/pt not_active IP Right Cessation
- 1999-11-29 AU AU13916/00A patent/AU1391600A/en not_active Abandoned
- 1999-11-29 EP EP99973085A patent/EP1135556B1/fr not_active Expired - Lifetime
- 1999-11-29 AT AT99973085T patent/ATE237030T1/de not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000032874A1 (fr) | 2000-06-08 |
| FR2786510B1 (fr) | 2001-02-16 |
| AU1391600A (en) | 2000-06-19 |
| BR9915844A (pt) | 2002-01-15 |
| DE69906789D1 (de) | 2003-05-15 |
| FR2786510A1 (fr) | 2000-06-02 |
| EP1135556A1 (fr) | 2001-09-26 |
| ATE237030T1 (de) | 2003-04-15 |
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