EP2938785B2 - Verfahren zur herstellung eines sicherheits- und/oder werterhaltungsfilms durch eindringen in ein fasersubstrat mit einem wärmeaktivierbaren klebstoff - Google Patents

Verfahren zur herstellung eines sicherheits- und/oder werterhaltungsfilms durch eindringen in ein fasersubstrat mit einem wärmeaktivierbaren klebstoff Download PDF

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Publication number
EP2938785B2
EP2938785B2 EP13828841.0A EP13828841A EP2938785B2 EP 2938785 B2 EP2938785 B2 EP 2938785B2 EP 13828841 A EP13828841 A EP 13828841A EP 2938785 B2 EP2938785 B2 EP 2938785B2
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EP
European Patent Office
Prior art keywords
fibrous substrate
adhesive
heat
fibrous
substrate
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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.)
Not-in-force
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EP13828841.0A
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English (en)
French (fr)
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EP2938785A1 (de
EP2938785B1 (de
Inventor
Vincent GODARD
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Oberthur Fiduciaire SAS
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Oberthur Fiduciaire SAS
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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
    • D21H21/18—Reinforcing agents
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed 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
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper

Definitions

  • the invention relates to the methods of preparing fibrous substrates for applications in the field of secure documents, more particularly cotton-based papers for banknotes.
  • the two main methods of reinforcing a security paper consist of adding synthetic reinforcing fibers in the cellulosic system or else of impregnating, or even flocculation, non-reactive polymers in the fibrous mat as described in Requirement EP 2 148 954 .
  • the impregnation or the flocculation of non-reactive polymers in the fibrous mat may, for its part, only to a limited or partial reinforcement of the mechanical properties. Furthermore, too much of the flocculated polymer in the fibrous mat can reduce the quality of the watermark.
  • the invention aims specifically to meet the aforementioned needs.
  • the penetration of a dispersion or of a solution of heat-activatable adhesive within the fibrous substrate advantageously makes it possible, after activation of said adhesive, to increase the mechanical strength of the fibrous substrate, in particular its resistance to double folds, its resistance to tearing. , its resistance to creasing or its resistance to dry or wet elongation.
  • the invention also makes it possible to have fibrous substrates whose resistance to wear and to soiling is improved.
  • the ability to withstand a high number of folds is a property that fiduciary printers and end users place great importance on.
  • the present invention makes it possible to reinforce the fibrous security and / or value substrate by penetrating therein the heat-activatable adhesive.
  • Such an adhesive can, in particular, replace the conventional bonding which uses, for example, polyvinyl alcohol (PVA). Bonding by using PVA may not be entirely satisfactory since the quantities of PVA which it is possible to deposit may be limited because, beyond a certain level of solid matter, the PVA is too viscous.
  • PVA polyvinyl alcohol
  • the invention therefore advantageously allows the application of larger quantities of adhesive than in known PVA bonding processes.
  • the proportion of fibers synthetics within the fibrous substrate may need to be increased, which may not be feasible and / or may result in degradation of the watermark rendering.
  • the present invention makes it possible to achieve good mechanical strength properties using a lower rate of synthetic fibers, and thus limits the degradation of the rendering of the watermark.
  • the fibrous substrate is devoid of adhesion agent other than the heat-activatable adhesive.
  • the fibrous substrate is, for example, devoid of a polyolefin, for example polyethylene or polypropylene, other than the heat-activatable adhesive.
  • heat-activatable adhesives are known in the field of decorative papers, a field in which these adhesives are used for their adhesive functions during the lamination of the particle board / decorative paper.
  • the heat-activatable adhesive is used, in the context of the present invention, to reinforce the fibrous base and not to bond the fibrous substrate to another element.
  • the heat-activated adhesive In addition to the penetration of the heat-activated adhesive and depending on the amounts used, there may be formation of a layer comprising the heat-activated adhesive on the surface of the fibrous substrate. It is however necessary in this case that at least part of the heat-activatable adhesive has penetrated en masse into the fibrous substrate.
  • the fibrous substrate has not, before step a), undergone any treatment capable of reducing the porosity of the zone of the fibrous substrate intended to be brought into contact with the fluid composition.
  • Such treatments can be impregnation, coating, surfacing or spraying treatments, which can “plug” the pores of the fibrous substrate.
  • the fibrous substrate is preferably in the form of a sheet of paper.
  • the fibrous substrate is preferably made of paper.
  • the fibrous substrate can be a nonwoven material.
  • the “fibrous substrate” within the meaning of the present invention covers the fibrous substrate of the sheet obtained after draining, pressing and drying a fibrous suspension but also, more generally, any fibrous mat formed during the manufacture of the sheet having a sufficient cohesion to undergo step a). This fibrous mat may in some cases not be completely drained and / or dried.
  • step a) is carried out after the formation of the fibrous substrate.
  • Step a) is preferably carried out on a fibrous substrate of the sheet obtained after draining, pressing and drying a fibrous suspension.
  • a heat-activatable adhesive is any adhesive whose adhesive properties increase very strongly following an input of thermal energy, this input of energy leading to a modification of the physical structure of the adhesive, and / or preferably internal chemical reactions. , even at its interfaces.
  • Step a) does not consist in the application of a hot-melt adhesive (or “hot melt”) without a fluid medium, for example in the molten state, the adhesive being, in this case in the pure state ( ie not dispersed or solubilized in a fluid medium).
  • a hot-melt adhesive or “hot melt”
  • a heat-activatable adhesive can undergo a chemical reaction, for example crosslinking, following an input of heat in order to increase its adhesive properties.
  • a heat-activatable adhesive can also be activated by simple fusion following a supply of heat, said fusion improving the contact and, consequently, after cooling, the adhesion of the adhesive to the fibers of the fibrous substrate.
  • the security element is preferably a watermark.
  • the watermark may be clear, that is to say formed by a local reduction in thickness of the fibrous substrate, or dark, that is to say formed by a local increase in thickness of the fibrous substrate.
  • the watermark is multi-tone.
  • the fluid composition is, during step a), deposited on a surface of the fibrous substrate by impregnation, coating, surfacing and / or spraying.
  • the fluid composition is, during step a), deposited on a surface of the fibrous substrate by impregnation.
  • the fluid composition can be deposited on only one face of the fibrous substrate or, preferably, on two opposite faces.
  • the fluid composition is preferably deposited over the entire surface of the fibrous substrate.
  • the fluid composition is deposited in a pattern on the surface of the fibrous substrate.
  • the fluid composition is preferably deposited over the entire surface of at least one face of the fibrous substrate.
  • Step a) is preferably carried out by means of a device chosen from among the following devices: impregnator, size press (also called “size press”), air knife or doctor blade coater, curtain coater, coater Champion, gravure coater, film transfer coater (also called “Film press”), for example “Twin-HSM” coater from the company BTG, or spray device, for example nozzle or gun. It is preferably implemented by a device chosen from an impregnator, a size press (also called “size press”) or a film transfer coater.
  • Step a) is preferably carried out on a paper machine before any other impregnation, coating, surfacing and / or spraying operation.
  • Carrying out this step before any other impregnation, coating, surfacing and / or spraying operation advantageously makes it possible to facilitate the impregnation of the fibrous substrate with the fluid composition and thus to allow relatively deep impregnation.
  • the fluid composition penetrates the fibrous substrate obtained after implementation of step a) on at least 25%, preferably at least 50%, preferably at least 75%, preferably substantially all, of its thickness.
  • a high penetration depth of the fluid composition, and therefore of the adhesive, within the fibrous substrate advantageously makes it possible to improve the mechanical strength of the latter and, in particular, its resistance to folding and creasing.
  • the fibrous substrate undergoing step a) comprises synthetic reinforcing fibers, preferably at least 5%, and more preferably at least 15%, by dry weight of synthetic reinforcing fibers relative to the total weight of the substrate. fibrous.
  • a fibrous substrate comprising synthetic fibers advantageously makes it possible, after activation of the adhesive, to greatly increase the mechanical strength of the fibrous substrate.
  • the synthetic fibers increase the porosity of the fibrous substrate thus allowing better impregnation / penetration of the adhesive, and, on the other hand, the adhesive has better adhesion with the synthetic fibers (compared to adhesive adhesion / cellulosic fibers).
  • the adhesive can be brought during step c) of activation to an activation temperature T a greater than or equal to the minimum activation temperature T a min which may itself be greater than the temperature of use T m of the fluid composition comprising the heat-activatable adhesive during step a).
  • the adhesive power of the heat-activatable adhesive present within the fibrous substrate then increases considerably, due to chemical modification, in particular by chemical reaction or crosslinking, or else physical, in particular by crystallization or increase in contact surface.
  • a heat-activatable adhesive is preferably considered to be any adhesive whose adhesiveness at a temperature T after activation according to step c) is greater than the adhesiveness at this same temperature T before activation according to step c), the temperature T being lower than the activation temperature T a .
  • T a min cited above is the minimum activation temperature T a for which the increase in adhesiveness following activation, as described in the previous paragraph, is verified.
  • the activation is performed by heating the fibrous substrate by bringing a heated surface into contact with the fibrous substrate.
  • Heating of the fibrous substrate during activation can be localized at one or more distinct areas of the substrate. Heating is applied, for example, substantially only at the level of a middle zone of one face or of the two opposite faces of the substrate.
  • the heating of the fibrous substrate is spatially uniform, that is to say that each zone of the surface of the fibrous substrate receives substantially the same thermal energy.
  • the thermal energy imparted to the surface of the fibrous substrate exhibits a non-zero spatial variation or gradient along the surface of the fibrous substrate.
  • the adhesive is thermoreactive and undergoes a chemical reaction, in particular crosslinking, during step c).
  • the crosslinking taking place during step c) is preferably limited so as not to obtain a thermosetting adhesive.
  • the density of chemical bonds produced by the crosslinking reaction can be relatively low so that the heat-activated adhesive maintains high softness and flexibility, and hence the resulting substrate also maintains high softness and flexibility, by particularly high folding resistance.
  • the degree of crosslinking is preferably chosen so that the heat-activated adhesive has an elastomeric character.
  • the substrate does not include any crosslinking agent.
  • heat-activated adhesive means the product resulting from the activation of a heat-activated adhesive. This product corresponds, for example, to the product obtained after crosslinking of the heat-activatable adhesive present within the substrate fibrous. As a variant, this product corresponds to the product obtained after melting and cooling of the heat-activatable adhesive present within the fibrous substrate.
  • the adhesive present within the fibrous substrate is, during step c), brought to a temperature above 40 ° C, preferably between 80 ° C and 180 ° C, and / or a pressure greater than or equal to 3 bar, preferably greater than or equal to 10 bar, is applied to the fibrous substrate during step c).
  • Step c) can last between 1 second and 15 minutes.
  • the tackiness of the adhesive can be maximized by raising its temperature to between 80 ° C and 180 ° C for a few or tens of seconds, and preferably by keeping the fibrous substrate under pressure. Temperature and residence time can have a greater influence on adhesion than pressure.
  • the activation step c) is preferably carried out online.
  • the fibrous substrate having undergone or, preferably, undergoing step c) is, preferably, coated on all or part of its surface with a “non-stick” coating, that is to say non-adhesive, to isolate the heat-activated adhesive from the exterior of the fibrous substrate.
  • the non-stick coating can be applied before, during and / or after step c).
  • the non-stick coating is preferably applied before the start of step c).
  • the non-stick coating is for example a film, in particular extruded or laminated, or a fluid composition.
  • Said fluid composition may be in the form of a dispersion, in particular an emulsion or suspension, or a solution in a fluid medium of the fluid composition.
  • This dispersion, in particular emulsion or suspension, or solution can be in the aqueous phase.
  • the non-stick coating is preferably applied by impregnation, coating, surfacing and / or spraying of a fluid composition, or by extrusion or lamination of a film. It is more preferably applied by coating or surfacing a fluid composition.
  • the non-stick coating is coated with an additional coating, having in particular printability and / or protective properties, for example against soiling.
  • the non-stick coating is a coating forming a protective layer in particular to improve the resistance to soiling of the substrate, and / or a coating making it possible to improve the printability of the substrate.
  • the non-stick coating advantageously makes it possible to prevent the fibrous substrate from sticking to various elements after activation. Thus, it is possible to avoid that after activation, the fibrous substrate does not stick to elements of the paper machine or to itself during winding or cutting for example.
  • the fluid medium present within the fibrous substrate obtained after carrying out step a) is evaporated before carrying out step c).
  • the fluid medium is, in particular, liquid.
  • the fluid medium can be a solvent when the heat-activatable adhesive is dissolved in the fluid composition.
  • the fluid medium can be evaporated during step c), the heating of the fibrous substrate carried out during step c) being able both to activate the adhesive and to evaporate the fluid medium.
  • the temperatures used during the implementation of the methods according to the invention can be controlled.
  • the temperature allowing the evaporation of the fluid medium from the fluid composition may be lower than the activation temperature of the heat-activated adhesive.
  • Such a treatment advantageously allows the adhesive to temporarily retain zero or low tackiness, which is advantageous in order to prevent the fibrous substrate from sticking to various elements if the substrate is not coated with an anti- adherent.
  • Evaporation of the fluid medium is preferably carried out by positioning a heated surface, for example one or more heated cylinders, in the vicinity and / or in contact with the fibrous substrate, and / or by blowing hot air on the fibrous substrate.
  • a heated surface for example one or more heated cylinders
  • Such heating modes advantageously make it possible to obtain moderate heating and avoid activating the adhesive, unlike infrared drying which may be too powerful.
  • Such a sheet has in particular the advantage, due to the non-activation of the adhesive, of not sticking and of not disturbing the manufacturing process (in particular the impregnated fibrous substrate does not stick to the constituents. of the machines used, in particular the fabrics, felts and rolls of the paper machine and the dispersion / solution does not clog the circuits).
  • Such a sheet advantageously exhibits increased mechanical strength, in particular resistance to double folds.
  • the fibrous substrate can be coated over all or part of its surface with a non-stick coating.
  • the adhesive may be heat-reactive or may be the product of the activation of a heat-reactive adhesive.
  • the fibrous substrate comprises synthetic reinforcing fibers, preferably at least 5%, and more preferably at least 15%, by dry weight of synthetic reinforcing fibers relative to the total weight of the fibrous substrate.
  • a sheet comprising synthetic fibers advantageously has a very greatly increased mechanical strength.
  • the density of islands may decrease over a first portion of the thickness and then possibly increase over a second portion of the thickness up to on the second face, the first and second portions succeeding each other when moving in the same direction along the thickness of the fibrous substrate.
  • the density of the islands is constant over the entire thickness of the fibrous substrate.
  • a security and / or value document is described incorporating a security and / or value sheet as defined above.
  • the document is for example a means of payment, such as a banknote, a card, a check or a restaurant ticket, an identity document, such as an identity card, a visa, a passport or a driving license, a lottery ticket, a transport ticket or an entrance ticket to cultural or sporting events, a loyalty card, a service card, a subscription card, a playing or collecting card , a voucher or a voucher or a banknote.
  • a banknote such as a banknote, a card, a check or a restaurant ticket
  • an identity document such as an identity card, a visa, a passport or a driving license, a lottery ticket, a transport ticket or an entrance ticket to cultural or sporting events, a loyalty card, a service card, a subscription card, a playing or collecting card , a voucher or a voucher or a banknote.
  • the sheet according to the invention can be laminated with at least one plastic layer.
  • a fibrous substrate comprising a security element
  • a fluid composition comprising a heat-activatable adhesive dispersed or dissolved in a fluid medium of the fluid composition for improving the mechanical properties. , in particular the double-fold resistance, of said fibrous substrate.
  • the fibrous substrate may comprise fibers conventionally used in the papermaking field, in particular cellulose fibers.
  • the fibrous substrate can include a mixture of long and short cellulosic fibers.
  • the fibrous substrate may include adjuvants conventionally used in the papermaking field, in particular retention agents, sizing agents and / or wet strength agents.
  • the fibrous substrate is for example based on cellulosic fibers (in particular cotton fibers) and / or natural organic fibers other than cellulosic and / or artificial fibers and / or synthetic fibers, for example such as polyester or polyamide fibers, and / or optionally mineral fibers, for example such as glass fibers.
  • cellulosic fibers in particular cotton fibers
  • natural organic fibers other than cellulosic and / or artificial fibers and / or synthetic fibers
  • polyester or polyamide fibers for example such as polyester or polyamide fibers
  • mineral fibers for example such as glass fibers.
  • the fibrous substrate can comprise one or more fibrous layers (also called jets) assembled after formation, in particular in the wet phase.
  • the fibrous substrate may include one or more security structures obtained during manufacture, and the substrate may in particular include a fibrous layer bearing a watermark.
  • the fibrous layer (s) of the substrate can be produced on a paper machine with a flat table or with a round shape, and the watermark (s) can be produced in the wet part according to conventional methods known to those skilled in the art.
  • the fibrous substrate obtained after activation can have a basis weight (according to the ISO 536 standard) of between 60 g / m 2 and 140 g / m 2 , preferably between 85 g / m 2 and 115 g / m 2 .
  • the fibrous substrate obtained after activation may have a thickness of between 60 ⁇ m and 250 ⁇ m, preferably between 100 ⁇ m and 140 ⁇ m.
  • At least one fibrous layer of the substrate comprises a recess, for example an opening in the form of a fiber-free reserve, produced for example on a paper machine or outside a paper machine. , for example by reduction of dripping, with a punch, by laser cutting or by water jet.
  • the recess (s) present on at least one fibrous layer of the substrate can each have an area of between 0.1 and 10 cm 2 .
  • the recess (s) may have any geometric shape, in particular rectangular or circular.
  • the presence of the adhesive advantageously makes it possible to prevent the fibers from coming off, even if the fibrous substrate has a recess.
  • At least one security thread is introduced at least partially into the fibrous substrate.
  • a security thread is in particular introduced en masse or in a window.
  • the invention thus also makes it possible to improve the attachment of said security thread in the fibrous substrate and thus contributes to improving the securing of the fibrous substrate.
  • the adhesive comprises a thermoplastic polymer, the glass transition temperature (T g ) of the thermoplastic polymer preferably being less than or equal to + 10 ° C.
  • Tg is measured according to the ISO 11357 standard.
  • thermoplastic polymers are advantageous because they can soften, possibly melt, then re-solidify and this repeatedly without significantly losing their properties.
  • thermoplastic polymers having a glass transition temperature of less than or equal to + 10 ° C. is advantageous because it makes it possible to confer flexibility and sufficient flexibility on the fibrous substrate obtained after activation.
  • the fluid composition may be in the form of a dispersion, in particular an emulsion or suspension, or a solution of the thermoplastic polymer in a fluid medium of the fluid composition.
  • This dispersion, in particular emulsion or suspension, or solution can be in the aqueous phase.
  • thermoplastic polymer can be (a) hard (solid) or (b) soft (softened, liquid) at room temperature, i.e. at 20 ° C.
  • it is a powder, for example a powder of a thermofusible polymer (or “hot melt”). It is preferably a thermoplastic polymer according to the case (b).
  • the thermoplastic polymer is chosen from the families of acrylic polymers, polyurethanes, polyolefins, in particular polyethylene, polypropylene, ethylene-vinyl acetate (EVA, “ethylene vinyl acetate”), ethylene acrylic acid (EAA, “ethylene acrylic acid”), ethylene methacrylate (EMA, "ethylene methacrylate”), methylethylene methacrylate (EMMA, "ethylene methyl methacrylate”), polyvinylidene chloride (PVDC , “Polyvinylidene chloride”), thermoplastic resins of elastomer type, in particular styrene-butadiene rubber latex (SBR, “styrene butadiene rubber”), or their mixtures or copolymers.
  • EVA ethylene vinyl acetate
  • EAA ethylene acrylic acid
  • EMA ethylene methacrylate
  • EMMA methylethylene methacrylate
  • PVDC polyvinylidene chloride
  • thermoplastic resins are of the elastomeric type
  • the crosslinking may have already taken place during the manufacture of the resin.
  • the aforementioned families of polymers are, in an exemplary embodiment, used in the context of the processes according to the invention in a fluid composition which is in the form of a dispersion, in particular an emulsion or suspension, or a solution of said polymer. thermoplastic in a fluid medium.
  • the fluid medium of the fluid composition is water, the fluid composition preferably being an aqueous dispersion, in particular of a polyurethane, an acrylic polymer, a polyethylene, a polypropylene or of a copolymer of ethylene and propylene. It is more preferably an aqueous dispersion, in particular of a polyurethane.
  • thermoplastic polymer can furthermore be thermosetting ("thermoset (ting) resins").
  • thermosetting thermosetting (ting) resins
  • the thermosetting nature is preferably limited as described above so as not to unduly harm the thermoplastic properties of the polymer.
  • the adhesive can crosslink under the effect of heat to form irreversible covalent bonds by carrying out at least one chemical reaction.
  • Crosslinking is made possible, either directly if the resin is self-crosslinking, or by adding a resin or a crosslinking agent.
  • the fluid composition may contain other compounds, in particular chosen from hot-melt agents, tackifiers, plasticizers, mineral fillers, taggants, anti-microbial agents, tracers or agents. surfactants.
  • the adhesive may comprise at least one chemical or biochemical reagent for forgery and / or authentication and / or identification reacting in a colored manner, with at least one agent respectively for forgery and / or authentication and / or d 'identification.
  • the heat-activated adhesive used can be of plant or animal origin.
  • the fibrous substrate preferably makes it possible to provide identification and / or authentication information by measuring the content of bio-sourced material by quantification of the isotope 14 of carbon ( 14 C).
  • security elements that may be present within the fibrous substrate, some are detectable by eye, in daylight or in artificial light, without using a particular device.
  • These security elements include, for example, colored fibers or planchettes, fully or partially printed or metallized threads. These security elements are said to be first level.
  • Additional security features are detectable only with a relatively simple device, such as an ultraviolet (UV) or infrared (IR) emitting lamp.
  • UV ultraviolet
  • IR infrared
  • These security elements include, for example, fibers, boards, bands, threads or particles. These security elements may or may not be visible to the naked eye, for example being luminescent under lighting from a Wood lamp emitting in a wavelength of 365 nm. These security elements are said to be second level.
  • security elements require a more sophisticated detection device for their detection. These security elements are for example capable of generating a specific signal when they are subjected, simultaneously or not, to one or more external excitation sources. The automatic detection of the signal makes it possible to authenticate the document, if necessary.
  • security elements include, for example, tracers in the form of active materials, particles or fibers, capable of generating a specific signal when these tracers are subjected to optronic, electrical, magnetic or electromagnetic excitation. These security elements are said to be third level.
  • Reagents can also be incorporated into the fibrous substrate, they are for example chemical or biochemical reagents of forgery and / or authentication and / or identification which can in particular react respectively with at least one agent of forgery and / or authentication and / or identification.
  • the additional security element (s) present within the fibrous substrate may have first, second or third level security characteristics.
  • the fluid composition can have a function of a second or third level security element. To this end, it comprises for example a second or third level security element.
  • the fibrous substrate may comprise reinforcing fibers made from a synthetic or artificial polymer, preferably from a synthetic hydrocarbon polymer.
  • the reinforcing fibers can be chosen from polyester or polyamide fibers, and mixtures thereof.
  • the reinforcing fibers are polyamide or polyethylene terephthalate (PET) fibers, and are present in an amount by dry weight greater than 3%, preferably between 3 and 35% relative to total fibers of the substrate.
  • PET polyethylene terephthalate
  • the reinforcing fibers also have an authentication function.
  • the reinforcing fibers can have luminescent properties, for example fluorescent.
  • polyester fiber in particular polyethylene terephthalate (PET), which has a reactive compound (fluorescent for example) by grafting or by addition during the extrusion of the fiber.
  • PET polyethylene terephthalate
  • the length of the reinforcing fibers is preferably between 4 and 6 mm, preferably being approximately 4 mm.
  • the linear density of the fibers is preferably less than 3 dtex, preferably being approximately 1.7 dtex.
  • the tenacity of the fibers is preferably greater than 4 cN / dtex.
  • the rate of introduction into the fibrous substrate is for example between 3% and 35% by dry weight relative to the total fibers of the substrate. It is, for example, around 10%.
  • a fibrous substrate 1 having just been formed and comprising a watermark 5, substrate on which has been deposited by impregnation by means of a size press a fluid composition 13 comprising a dispersion 14 of a heat-activatable adhesive 11 within a medium fluid 10.
  • the fibrous substrate 1 can be formed by any known means.
  • the fibrous substrate 1 comprising the watermark 5 can be formed by a round-shaped machine.
  • the fibrous substrate 1 can first be formed by a flat table machine (Fourdrinier) and then be provided with the watermark 5, for example by bringing into contact with a watermark roll, for example during the draining of said substrate.
  • the fibrous substrate 1 comprises synthetic reinforcing fibers. It is possible, as illustrated, to deposit the fluid composition 13 over the entire surface of the fibrous substrate 1.
  • the fluid composition 13 is deposited on the two opposite faces 7 and 8 of the fibrous substrate, or even on only one side of the fibrous substrate.
  • the fluid composition 13 can also be deposited on only part of at least one face of the substrate.
  • the heat-activatable adhesive 11 can be a thermoplastic polymer, preferably belonging to the families described above.
  • the adhesive can be heat reactive and undergo crosslinking upon activation.
  • the fluid medium 10 may be water and the fluid composition 13 for example may be an aqueous dispersion of a polyurethane.
  • the deposition of the fluid composition 13 can be carried out on the fibrous substrate 1 by impregnation, coating, surfacing and / or spraying.
  • the flowable composition can be deposited after the fibrous substrate has been drained and, if the fibrous substrate is intended to have a watermark, after formation of the latter.
  • the fluid composition can be deposited before or after formation of the watermark, and preferably after the step of draining the fibrous substrate.
  • the quantity of heat-activatable adhesive 11 deposited on the face 7 of the fibrous substrate 1 can be between 1 gram of heat-activated adhesive 11 per m 2 and 30 grams of heat-activated adhesive 11 per m 2 , preferably between 2 grams of heat-activated adhesive 11 per m 2 and 10 grams of heat-activated adhesive 11 per m 2 .
  • the fluid composition 13 After penetration of the fluid composition 13 within the fibrous substrate 1, the structure shown in figure 2 . As can be seen in this figure, the fluid composition 13 penetrates the fibrous substrate 1 obtained after carrying out step a) over substantially the whole of its thickness e. It is not beyond the scope of the present invention if the penetration takes place over only part of the thickness e of the fibrous substrate 1.
  • This structure 100 constitutes a security paper in which a set 15 of islands of a heat-activatable adhesive 11 is present within the fibrous substrate 1.
  • the adhesiveness produced by the heat-activatable adhesive 11 is relatively low. fact of non-activation of the latter, the evaporation conditions being chosen so as not to activate the heat-activated adhesive 11.
  • a non-stick coating 40 is then applied which is intended to isolate the adhesive from the exterior of the fibrous substrate 1 once the adhesive has been activated.
  • the fibrous substrate 1 after application of the non-stick coating 40.
  • the non-stick coating 40 can be applied at least on the face 7 on which the watermark 5 is present.
  • Applying the adhesive to the face on which the watermark is present advantageously makes it possible to reinforce clear watermarks such as watermarks obtained by galvano (or electrotype) or screened watermarks (for example as described in the patent EP 1 122 360 ).
  • the non-stick coating 40 can be applied to all or part of the face 7 on which the watermark 5 is present.
  • the non-stick coating is applied on two faces of the fibrous substrate, for example on a face on which a watermark is present as well as on the opposite face.
  • All or part of the non-stick coating 40 is intended to be brought into contact with an element forming part of a paper machine, on which the fibrous substrate is intended to be placed.
  • Activation can be carried out by exposing the fibrous substrate 1 to a temperature between 80 ° C and 180 ° C, for example by placing the fibrous substrate in an oven or in a press. Activation can allow the fibrous substrate to undergo a chemical reaction, for example to crosslink. In a variant, the activation comprises the melting of the heat-activatable adhesive then its solidification, for example following a cooling, in order to form the adhesive reinforcing islands 17.
  • Activation is advantageously carried out online, preferably on drying rolls or on heated calenders.
  • the figure 6 shows a banknote 200 incorporating a fibrous substrate 1 obtained after activation of the heat-activatable adhesive.
  • This note 200 has an apparent mention 201 and has improved mechanical strength properties, in particular resistance to double folds.
  • the high molecular weight polyurethane aqueous dispersion DISPERCOLL U 42 from the company BAYER is an example of a resin which can be used in the preparation of heat-activated adhesives which are effective for reinforcing banknote paper, and, more generally, any fibrous substrate for banknotes. security.
  • Its minimum activation temperature is between 80 ° C and 100 ° C. This dispersion generally finds applications in textiles because of the flexibility of the product obtained after thermal activation.
  • a high fiber composite paper (30% polyamide fiber, 6.0mm length, 87.0g / m 2 ) was used to increase product penetration into the paper material.
  • Activation is carried out in a press at 25 bars at 160 ° C. for 1 minute or in an oven at 130 ° C. for 10 minutes after application of an acrylic protective coating.
  • Bendtsen porosity and Bekk smoothness are measured before and after wrinkling (Table 2). Before carrying out these measurements, the paper undergoes a calendering step at 15 bars on both sides.
  • the heat-activatable adhesive reduces the porosity of crumpled paper.
  • the air flow through the crumpled paper decreases by at least 80%.
  • the leakage time in the Bekk smoothness test increases from + 50% to + 200%.
  • pure cotton paper sheets were respectively impregnated with a heat-activatable adhesive and the usual PVA bonding.
  • the adhesive tested is again the aqueous PU dispersion Dispercoll U 42 sold by the company Bayer. It is diluted by adding 200% water.
  • the adhesive is ⁇ u> Table 3 ⁇ /u> Cotton paper Paper 7 (invention) Paper 8 (comparative) Dispercoll U 42 diluted with 200% water PVA composition deposit (“PVA sizing”) comprising 6.25% of solid matter (comparative) 130 ° C oven 130 ° C oven Total weight g / m 2 - 102.2 99.5 Mass of adhesive or PVA deposited ("Sizing weight") g / m 2 /side 2.8 1.8 Mass of non-stick coating g / m 2 /side 3.1 3.7 Thickness ⁇ m - 129 129 Specific volume (“Bulk”) cm 3 / g - 1.26 1.29 Wet strength % MD 50.0 45.0 Dry elongation % MD 7.99 7.47 Wet elongation % MD 12.04 11.32 Double resistance (“Schopper folding”) Double fold MD
  • the heat-activated adhesive improves the mechanical properties of pure cotton paper. Folding resistance and tear resistance increase by + 57% and + 10% respectively.
  • composite paper for banknotes was impregnated with, instead of the usual PVA sizing, a PU dispersion in aqueous phase of Dispercoll U 42.
  • Activation is carried out by hot calendering, at a temperature of 180 ° C. and 16 bars.
  • Bendsten porosity is measured before and after creasing. Before carrying out these measurements, the paper undergoes a calendering step under a pressure of 15 bars on both sides.
  • the heat-activatable adhesive reduces the porosity of crumpled paper.
  • the air flow through the crumpled paper decreases by at least 80%.
  • Hycar 26-0202 aqueous phase resin contains a heat-activatable carboxylated styrene-acrylic copolymer. Its T g is equal to -12 ° C.
  • Carbobond 26373 is a self-crosslinking high dry extract acrylic resin supporting carboxylic chemical functions. Its T g is + 5 ° C.
  • the Hypod 4501 carboxylated propylene dispersion has vitrification temperatures T g and melting temperatures T f respectively equal to -26 ° C and 85 ° C.
  • the low-carboxylated propylene dispersion Hypod XU 36534.00 has vitrification temperatures T g and melting temperatures T f respectively equal to -32 ° C and 85 ° C.
  • the invention can be applied to a multi-ply or single-ply paper.
  • one or a plurality of the plies may be constituted by a paper produced according to the invention.

Landscapes

  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)
  • Paper (AREA)

Claims (12)

  1. Verfahren zur Herstellung eines Sicherheits- und/oder Wertblatts (100; 110; 200), wobei in den Schritten des Verfahrens:
    a) innerhalb eines Fasersubstrats (1), insbesondere aus Papier, eine Fluidzusammensetzung (13) zum Eindringen gebracht wird, die einen thermoaktivierbaren Klebstoff (11) aufweist, der innerhalb einer Fluidumgebung (10) der Zusammensetzung (13) dispergiert, insbesondere als Emulsion oder Suspension, oder aufgelöst ist, wobei das Fasersubstrat (1) ein Sicherheitselement (5), insbesondere ein Wasserzeichen, enthält oder dazu ausgelegt ist, ein solches aufzunehmen, und
    b) sofern das Fasersubstrat zur Aufnahme eines Sicherheitselements ausgelegt ist, das Sicherheitselement an dem Fasersubstrat angebracht wird,
    Verfahren in dem ferner in einem Schritt c) der thermoaktivierbare Klebstoff (11) aktiviert wird, der innerhalb des Fasersubstrats vorhanden ist, das nach Ausführung des Schritts a) erhalten wird, wobei die Aktivierung durch eine thermische Behandlung bewirkt wird, und der thermoaktivierbare Klebstoff (11) während des Schritts c) einer chemischen Modifikation, insbesondere durch eine chemische Reaktion oder Vernetzung, oder einer physikalischen Modifikation, insbesondere durch Kristallisation oder Wachstum der Kontaktfläche, unterzogen wird.
  2. Verfahren nach Anspruch 1, wobei die Aktivierung durch Erwärmung des Fasersubstrats (1) bewirkt wird, das nach Ausführung des Schritts a) erhalten wird, durch Positionierung einer Wärmefläche neben und/oder in Kontakt mit dem Fasersubstrat und/oder durch Blasen von Warmluft auf das Fasersubstrat (1), wobei der Aktivierungsschritt c) vorzugsweise online bewirkt wird
  3. Verfahren nach Anspruch 1 oder 2, wobei das Fasersubstrat (1), das dem Schritt c) unterzogen wurde oder wird, ganz oder teilweise auf seiner Oberfläche mit einem anti-adhäsiven Überzug (40) überzogen wird, der eine Isolation des thermoaktivierbaren Klebstoffs (17) vom Äußeren des Fasersubstrats erlaubt, wobei der anti-adhäsive Überzug (40) vorzugsweise vor Beginn des Schritts c) aufgebracht wird.
  4. Verfahren nach einem der vorstehenden Ansprüche, wobei das dem Schritt a) unterzogene Fasersubstrat (1) synthetische Verstärkungsfasern enthält, vorzugsweise wenigstens 5 Trockengewichts-% synthetische Verstärkungsfasern bezogen auf das Gesamtgewicht des Fasersubstrats (1).
  5. Verfahren nach einem der vorstehenden Ansprüche, wobei die Fluidzusammensetzung (13) nach dem Schritt a) auf einer Fläche (7) des Fasersubstrats (1) zur Imprägnierung, Einbettung, Oberflächenbehandlung und/oder Pulverisierung abgelegt wird.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei die Fluidumgebung (10), die innerhalb des nach Durchführung des Schritts a) erhaltenen Fasersubstrats (1) vorhanden ist, vor Durchführung des Schritts c) ganz oder teilweise verdampft.
  7. Verfahren nach einem der vorstehenden Ansprüche, wobei der Klebstoff ein thermoplastisches Polymer aufweist, wobei die Glasübergangstemperatur (Tg) des thermoplastischen Polymers vorzugsweise höchstens 10°C beträgt.
  8. Verfahren nach dem vorstehenden Anspruch, wobei das thermoplastische Polymer ausgewählt ist aus den Familien der Acrylpolymere, der Polyurethane, der Polyolefine, insbesondere Polyethylen, Polypropylen, Ethylenvinylacetat (EVA), Ethylen-Acrylsäure (EAA), Ethylen-Methacrylat (EMA), Methylethylen-Methacrylat (EMMA), Polyvinylidenchlorid (PVDC), thermoplastischen elastomerartigen Harze, einschließlich Styrol-Butadien-Kautschuk-Latex (SBR) oder deren Mischungen oder Copolymeren.
  9. Verfahren nach einem der vorstehenden Ansprüche, wobei die Fluidumgebung (10) der Fluidzusammensetzung (13) wässrig ist, und die Fluidzusammensetzung vorzugsweise eine wässrige Dispersion ist, insbesondere eines Polyurethans, eines Acrylpolymers, eines Polyethylens, eines Polypropylens oder eines Ethylen-Propylen-Copolymers.
  10. Verfahren nach einem der Ansprüche 1 bis 9, wobei der innerhalb des Fasersubstrats (1) vorhandene Klebstoff während des Schritts c) eine Temperatur oberhalb von 40°C hat, vorzugsweise zwischen 80°C und 180°C, und/oder auf das Fasersubstrat (1) während des Schritts c) ein Druck von mindestens 3 bar ausgeübt wird, vorzugsweise mindestens 10 bar.
  11. Verfahren nach einem der vorstehenden Ansprüche, wobei die Fluidzusammensetzung (13) in das nach Durchführung des Schritts a) erhaltene Fasersubstrat (1) zu mindestens 25%, vorzugsweise zu wenigstens 50%, besonders vorzugsweise zu wenigstens 75%, seiner Dicke (e), vorzugsweise im Wesentlichen vollständig, eindringt.
  12. Verfahren nach einem der vorstehenden Ansprüche, wobei der Schritt a) auf einem Fasersubstrat realisiert wird, das nach einem Entwässern, Pressen und Trocknen einer Fasersuspension erhalten wird.
EP13828841.0A 2012-12-19 2013-12-19 Verfahren zur herstellung eines sicherheits- und/oder werterhaltungsfilms durch eindringen in ein fasersubstrat mit einem wärmeaktivierbaren klebstoff Not-in-force EP2938785B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1262323A FR2999618B1 (fr) 2012-12-19 2012-12-19 Procede de preparation d'une feuille de securite et/ou de valeur par penetration d'un adhesif thermoactivable au sein d'un substrat fibreux.
PCT/IB2013/061132 WO2014097205A1 (fr) 2012-12-19 2013-12-19 Procede de preparation d'une feuille de securite et/ou de valeur par penetration d'un adhesif thermoactivable au sein d'un substrat fibreux

Publications (3)

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EP2938785A1 EP2938785A1 (de) 2015-11-04
EP2938785B1 EP2938785B1 (de) 2017-12-13
EP2938785B2 true EP2938785B2 (de) 2020-11-11

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EP13828841.0A Not-in-force EP2938785B2 (de) 2012-12-19 2013-12-19 Verfahren zur herstellung eines sicherheits- und/oder werterhaltungsfilms durch eindringen in ein fasersubstrat mit einem wärmeaktivierbaren klebstoff

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EP (1) EP2938785B2 (de)
FR (1) FR2999618B1 (de)
WO (1) WO2014097205A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009024987A1 (de) † 2009-06-16 2010-12-23 Giesecke & Devrient Gmbh Folienverbundbanknote
EP2466005A1 (de) † 2006-10-27 2012-06-20 Crane & Co., Inc. Schmutz- und/oder feuchtigkeitsabweisendes sicheres Dokument

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT944921B (it) * 1970-11-16 1973-04-20 Gordon W Perfezionamento nella carta di sicurezza in particolare carta valuta e simili
FR2804447B1 (fr) 2000-02-01 2002-04-05 Arjo Wiggins Sa Papier comportant un filigrane a effet multiton et toile pour fabriquer ce papier
FR2814476B1 (fr) 2000-09-11 2003-04-11 Arjo Wiggins Sa Feuille de securite comportant une couche transparente ou translucide
FR2827618B1 (fr) * 2001-07-18 2003-10-03 Banque De France Procede de securisation de documents
ATE394243T1 (de) 2003-02-27 2008-05-15 Landqart Mehrschichtlaminat
FR2916768B1 (fr) 2007-05-31 2009-07-24 Arjowiggins Licensing Soc Par Feuille de securite resistante au froissement, son procede de fabrication et un document de securite la comprenant

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2466005A1 (de) † 2006-10-27 2012-06-20 Crane & Co., Inc. Schmutz- und/oder feuchtigkeitsabweisendes sicheres Dokument
DE102009024987A1 (de) † 2009-06-16 2010-12-23 Giesecke & Devrient Gmbh Folienverbundbanknote

Also Published As

Publication number Publication date
EP2938785A1 (de) 2015-11-04
WO2014097205A1 (fr) 2014-06-26
FR2999618B1 (fr) 2015-03-20
FR2999618A1 (fr) 2014-06-20
EP2938785B1 (de) 2017-12-13

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