DE19801973A1 - Opaque, tear-proof paper, procedures for making it, and scratch cards made from this paper - Google Patents

Description

The present invention is in the field of for For safety purposes used fibrous carrier materials for Labeling and / or printing, in particular of paper exist (so-called security paper). This fibrous carrier materials or security papers are used for the production of documents requiring assistance, such as tickets, Rei documents, checks, legal or official documents, Letters of credit, insurance confirmations, theater tickets, driving badges for trains, airplanes and the like or for scratch cards cards for gambling or lottery purposes, also known as lots for Lotteries with immediate profit distribution (instant lotteries) be designated. In particular, the invention relates to bevel rige carrier materials such as forgery-proof Wertpa animals that are verifiable by tearing as they Tear off a multi-colored sandwich structure. This type of review and fight against counterfeiting is used in the field of ticketing, where it is around significant values can go.

The present invention further relates to fibrous carriers germaterials, in particular security notes, the be can be printed and printed and for the production of Scratch cards can be used for gaming purposes where on printed and hidden information not at Durchsichtbe may be recognizable, whereby any other by delaminating induced fraud is avoided.

The direct testing of a sheet of fibrous carrier material, e.g. B. from paper, by tearing allows the exposure of the following multi-colored sandwich structure:
a colored interior and two white, clear or differently colored outer sections (layers). This characteristic structure makes it possible to reliably verify the original origin of certain documents, some of which have a very high value, such as tickets, tickets or the like. Since this tearing-test technology is quick and safe, it is fully competitive with other known systems, such as watermarks, which have existed for a long time, or the introduction of security fibers or security threads. Some of these known systems (including fluorescent or phosphorescent dots or fibers) have the disadvantage that they require a corresponding detection device for verification. A typical example of such a device is a UV lamp.

Consequently, fibrous substrates or papers should be used for value purposes, which are opaque and whose multicolored sandwich structure a checkability by On to tear, to prevail without difficulty, especially for forgery-proof driving passes and Ein if possible, one of the time existing major disadvantages of such, by tearing verifiable, fibrous materials or papers which are in ih delaminable nature consists of eliminating. This, the application obstructing disadvantage is on the struk and the production method of such known fibrous Attributed carrier materials or papers.

There is known a first type of structure in which three Pa pier layers are interconnected by lamination, wherein the middle layer is colored and the outer layers have a white color.

A second known type of structure is colored formed sheet of paper, the one by coating minde at least one surface side with the help of a white or un treated by transparent coating.

The coating of colored supports is on the Ge The securities securities have long spread, albeit the intended goal is not in the provision of  consisted of a tear test verifiable papers. The US Patent 1 417 820 describes a method of counterfeiting safely equipping a paper by looking at the two sides a black paper with a coating be stratified, the opaque and to solvents, in suitable for counterfeiting ink or Druckfar ben-extinguishing preparations are sensitive. Thus here too, there is a sandwich-like structure of the following Type in front: light colored coating layer / black or dark colored paper / light colored coating layer.

Furthermore, in the field of security papers, the product according to GB patent 1 435 686 is known, which is secured against counterfeiting attempts by scraping the surface with the aim of eliminating ink or ink. This security paper comprises a layer of base paper provided with an opaque and abrasion-resistant coating composed of a non-metallic pigment (clay or TiO ₂ ) which is contained in a binder (synthetic polymer = vinyl copolymer / acrylic). Styrene / acrylic styrene / butadiene or natural cellulose starch casein polymer) is dispersed exists. The sheet of the base paper has a color which is in contrast to the coating layer over, so that attempts to scrape the upper layer in reviewing be recognized. This patent does not teach the following sandwich structure: light or white coloration / different or darker coloration / light or white coloration.

The coating of a colored paper with the aid of an opacifying or white composition is used in security papers which are intended for particular applications, such as the production of lots for instant liquors or of all other types of documents for scratch games. Such items contain printed, hidden information, which can be on the one hand numbers, symbols or messages about an eventu ellen profit and on the other hand to security numbers, the counterfeits should prevent transactions act. The concealment or masking of such information is conventionally achieved by means of an opaque scratch-off layer (abschabbaren layer) comprising, for example, a metallic pigment (aluminum) dispersed in a binder formed from a latex of rubber or other hydrocarbon polymers (See layer 28 of the lottery ticket described in U.S. Patent 4,726,608). In addition to this opaque layer, the ticket includes as a coating of a paper base material 18 (from top to bottom) a polyamide adhesion preventing layer 26 , a maleated vinyl acetate copolymer protective layer 25 , the printed indicia 24 , an amorphous silica + maleated vinyl acetate primer layer Polymers + n-propyl acetate as a solvent and finally an aluminum foil 20 adhered to the paper carrier material 18 .

In order to eliminate the disadvantages associated with the presence of the aluminum foil in this type of scratch-off card, European Patent 0 428 489 proposes the use of coated paper for the manufacture of such articles. The paper note known from this patent comprises a paper base support material having a basis weight of the order of 225 g / m ² which is dyed with carbon black to a completely opaque texture and with a composition comprising pigments such as clay or titanium dioxide. Latex or starch contains, is coated. The surfaces of the coated paper obtained in this way are white, smooth and uniform and thus printable. These papers are thus in a non-delaminatable state. In order to produce a lottery ticket for an instant lottery, it is intended to print the coating pages and then make a final coating with a conventional colored and rubbelable latex. From this patent, the following sandwich structure is thus known: white coating / opaque black paper substrate / white coating Be.

EP-A-668 092 relates to tickets for instant ticket (scratch-off) tickets which do not provide un-transparent paper finishing by means of a paper base substrate as proposed in EP-B-428 489 but by means of an opaque coating applied to the base paper substrate and comprising a carbon black-type pigment dispersed in a latex-type binder of a styrene / butadiene copolymer. This opaque layer is further overcoated with an overlying printable layer obtained from a composition containing styrene / butadiene latex, CaCO ₃ and microspheres of a styrene-acrylic polymer.

FR-A-2 192 211 describes a method for dyeing absorbent paper having a rough surface, wherein the thickness of the colorant layer is as small as possible, but which still allows optically to obtain a uniform coloration. After one side is dyed, the paper can be coated with a thermosetting resin layer. In order to achieve this uniform coloring despite the uneven nature of the surface of the absorbent paper used, it is provided in this method to draw the paper side to be dyed by ma netic calendering or with a magnetic roller to the coloring agent in all wells and pores, and to perform printing by deep pressure in the wells or typoflexographic printing to ensure a coloring of the humps and depressions. According to the teaching of this document, only a single page of paper is dyed. The paper obtained according to this method is not homogeneous in thickness because it has a colorant layer on the surface which, due to the fact that it is as thin as possible, causes a heterogeneous nature of the paper with respect to its thickness. Moreover, this dyed absorbent paper is not obtained from one and the same fibrous mat of initial coloration C ₂ which is subsequently at least partially decolorized or otherwise colored on at least one of its sides to obtain at least one outer cut which is white or which Color C ₁ -C ₃ (different and / or less dark than the initial color C ₂ ).

FR-A-537357 relates to improvements in the production of colored boards and papers. In particular, this French patent describes laminations comprising a base layer of paperboard adhered to one or both sides of a layer of paper whose surface is dyed by means of a device consisting of dye erasers 10 and a device 11 for regulating the paper Color layers is determined is formed. According to a variant, the paperboard may be dyed directly on one of its sides with one or more color layers. Also, this layer arrangement is undoubtedly not homogenous in terms of its thickness ho, since it has one or more individual color layers and optionally a paper layer in addition to the base layer of cardboard. In addition, it can be seen that this known colored layer arrangement is not obtained by discoloration or coloration of a continuous fiber material of given initial color.

DE-C-67 632 relates to a process for coloring a Pa Pierseite, which is designed so that a migration of the Far agent from one side of the respective paper substrate is avoided on the other side, so that it is possible that both sides to dye independently. In this Procedure one leads the paper strip by a heated one Drying cylinder with the designation X and a dyeing cylinder with the designation B. The through the drying cylinder X too guided heat allows rapid drying of the dyeing by means of and thus its fixation on the paper surface. This method and the paper produced therewith are missing the following two properties: homogeneity with respect to the thickness (colorant layer on the surface) and Her discoloration or discoloration of at least one of the Pages with an initial, predetermined coloring.

From the above overview of the prior art it turns out that in known securities notes, which can be checked by a tear test and / or sufficiently un are transparent to them as carrier materials for losaus  wise for instant lotteries or scratch cards can (lack of recognition in Durchsichtbetrach tion), particularly often around multi-layered fibrous Trägerma terialien obtained by coating techniques become.

However, it is known that this technique is relatively expensive lig is, in particular due to the fact that it requires In most cases, they are outside the usual course of the Pa perform pier machine. It can be seen that this is the Productivity and profitability of papermaking process impaired. In addition, it is a Be layering a process that is quite easy with crafting can be reproduced. This contributes to the Fäl danger of extinction.

It should also be noted that the coating no satisfactory solution to the difficulty of Delamination brings. The fact that this problem, the inherent in multilayer structures by nature, at coated structures, is described in EP-A-0 668 092 (P.2, lines 29-30) underlined.

In this situation, one of the tasks of before underlying invention therein, a fibrous carrier material, in special a security paper, to provide that by a tear test is verifiable and made from an opaque Substrate exists, dedicated to the production of scratch cards is suitable, the disadvantages of conventional coated Security papers should be avoided.

A further object of the invention is that this security paper has the following properties:

• - verifiable by tear tests,
• - not delaminatable,
• - forgery-proof,
• - completely opaque, so that scratch cards no possibility of fraud by means of transmitted light be stands,
• - economically,
• - easy to print and write on,  
• - not easily reproduced by technical measures ible.

Another object of the present invention is in providing a method of making a fibrous carrier material and in particular a stamp Paper that can be checked by tearing, not delaminated and completely opaque, this process due to the fact that it is perfect in the conventional Paper making lines is integrable, lightweight and efficient be economically feasible.

Another object of the invention is the Be Provision of a verifiable by tearing mark paper made from the aforementioned fibrous carrier material in which the objects of the invention are achieved, consists.

Another object of the present invention is in the provision of scratch cards from the aforementioned fibrous carrier material.

To solve these problems, the Applicant has found by numerous studies that it is useful to provide an opaque, fibrous support material, in particular made of paper, which is formed from one and the same homo geneous fibrous network, which is initially colored and then on his is subjected to decolorization and / or color change on both outer sides to a certain thickness to give a sandwich structure of the following type:
outer portion, which is white or has the color C ₁ on / middle portion, the color C ₂ = or ≠ C ₁ has; and optionally an outer portion which is white or has the color C ₁ or C ₃ ,
in the case of C ₁ = C ₂ = C _3, a color gradient of light → dark exists from outside to inside.

The invention thus relates to an opaque fibrous carrier material 1 , in particular of paper, which is characterized in that it has been obtained from one and the same fibrous mat, for which the following applies:
→ homogeneous texture, in particular with regard to the thickness;
→ product made of a single fiber web; and
→ initial staining (C ₂ ), then decolorization or other staining (staining), at least in part on at least one of the sides, to form at least one outer portion ( 3 , 4 ) that is white or the color (C ₁ , C ₃ ) which is different and / or less dark compared to the initial color (C ₂ ).

Such a fibrous carrier material, in particular a security paper, has the advantage that it is not delami is completely opaque, is cheap and in a simple manner in a paper machine without substantial Changes to this machine is available.

In addition, due to the large-scale manufacture the risk of forgeries by one hand limited activity.

According to one embodiment, the fibrous carrier material is obtained from one and the same fibrous mat, which has the following properties:
→ homogeneous texture, in particular with regard to the thickness;
→ product made of a single fiber web; and
→ initial staining (C ₂ ), then discoloration or other staining, at least in part on at least one of the sides, on the one hand at least one outer section ( 3 , 4 ), which is white or has the color (C ₁ , C ₃ ), which in Compared to the initial color (C ₂ ) is different and / or less dark, and on the other hand at least one approximately in the middle section ( 2 ) having the color (C ₂ ) on.

If it is testable by tearing fibrous Support materials and in particular to security papers han delt, is the preferred, but not be restrictive embodiment of the invention to a fibrous Carrier material having an approximately in the middle, ge colored portion which, with each of its sides an outer white or compared to the middle ab  cut differently colored and / or less dark Section connects, the two outer sections of the same color or not.

This results in a multi-colored, for example two-color structure of the sandwich type: color C ₁ / color C ₂ / color C ₃ ,
wherein C _{1 is the} same or different from C ₃ and C _{2 is the} same or different from C ₁ and C ₃ ,
with the proviso that when C ₂ = C ₁ or C ₃ , C ₁ or C _{3 are} brighter than C ₂ .

This non-delaminatable, opaque structure fully complies with the specifics given above tions.

The structure of the carrier material according to the invention a homogeneous and coherent, fibrous network in his education on a paper machine as a single Fiber web joined together.

The attached single figure shows (not limited kenden) for explanatory purposes a cross section of suchi gene carrier material according to the preferred embodiment of Invention.

This figure shows a substrate 1 formed from one and the same fibrous network of thickness e and comprising in its thickness a central portion 2 of color C ₂ , this portion 2 having the outer portions 3 and 4 representing the color C ₁ and C ₃ , forming a continuous Liche fiber structure.

In this example, C ₁ , C ₂ and C _{3 have} the same base color, with C ₁ and C _{3 being} so much brighter than C ₂ that they are almost white.

Such a two-color, opaque structure which is not delaminatable is printed with a counterfeit-proof identification mark corresponding to the color C _{2 of} the middle section 2 , which ensures perfect tearing-testability.

An embodiment of the fibrous indicia carrier material according to the invention is characterized in that it has been obtained from an initially dyed fibrous mat which has subsequently been at least partially decolorized on at least one of its sides and preferably on both sides, whereby two outer sections 3 and 4 are formed, which are located on both sides of the colored central portion 2 .

This embodiment corresponds to the following sandwich Structure: white or very light brown / dark brown / white or very light brown, which in the attached and above be written single figure is shown. According to this The color contrast on the outside / inside is determined by means of a Obtained decolorant, which correspond from the sides of the each fibrous carrier material in a variable thickness after the penetration of this agent into the interior of the Support material has been absorbed.

According to another embodiment corresponding to the case where C _{2 is} different from C ₁ and / or C ₃ , the fibrous carrier material held from an originally dyed fibrous mat is then at least partially on at least one of its sides and preferably Dyeed differently on both sides, whereby the two outer sections from 3 , 4 are formed, which are arranged on both sides of the ge-colored central portion 2 .

In the former case, the coloring agent reacts with the decolorizing agent, while in the latter case the coloring agent reacts with a coloring agent which converts C ₂ in the surface layers of the fibrous carrier material 1 into C ₁ and C ₃ .

The presence of these two structural execution molds (among others) for the support material according to the invention rial brings plant-specific features with it. So is the fibrous carrier material characterized in that it at least one coloring agent and optionally at least a decolorizing agent and / or at least one recoloring agent contains tel that has not responded, but is capable of using to react with the colorant in the outer sections.

Advantageously, the pair of colorants / decolorants and / or colorants is selected from the group consisting of:

colorants Decolorizing agent and / or coloring agent metal reducing agent metal salt masking agents colored pH indicator Medium with the chosen pH colored redox indicator Medium with the selected redox potential coloring agent Means for degrading the colorant and mixtures thereof

The metal oxides or colored metal salts, such as Salts of iron or manganese can be replaced by reducing agents or sequestering agents, such as EDTA or potassium monophosphate, to be discolored.

As further examples of the pair of colorants / decolorizing agents may be mentioned (without limitation):

• - Metal oxide / reducing agent = copper or cobalt oxide / bisulfite in acidic medium,
• - Metal salt / masking agent = iron or vanadium salt / ascorbic acid.

The colored pH indicators used as a coloring agent are decolorizable easily by adhering to the Sides of the fibrous mat a liquid medium with a pH value, which turns the indicator into an undyed or converted into a different colored form. So will For example, phenolphthalein, the beginning in the paper substance is brought to a basic pH, which causes a pink color of the pulp. By spä Superficial application of an acid to the fibrous Matte becomes the phenolphthalein according to an acidic pH Value converted into its undyed form. As further Bei play for a pH indicator used as a coloring agent can be phenol red, Bromcresolpurpur or Mention bromophenol blue.

The colored redox indicators work the same way Principle like the aforementioned pH indicators, with the sub  differed that as a key parameter not the pH but the redox potential is used. As examples of this Pair of colorants / decolorants or colorants can be methylene blue or neutral red in combination with Mention sodium hypochlorite solution.

These colorants represent another class of he It can be used according to the invention suitable coloring in particular, to be colored by oxidizing agents Reagents are decomposable, for example by a Natri hypochlorite solution or solutions of sulphites, bisul fiten, acids, bases and the like. For example, can be Coloring agent with the chemical structure of triphenylme Than mention how BLEU DUASYN POUR ENCRES BJT of Fa. MAXIMUM. This coloring agent may be used in conjunction with decolorizing based on a sodium hypochlorite solution and / or a weak base or sodium sulfite combined become. As another example of a coloring agent in the he inventive fibrous carrier material, the reaction depleting agents to produce a Color change is capable of cresol red in Verbin with sodium hypochlorite solution in the decolorization / Mention the bath.

To illustrate the embodiment according to which the fiber-like carrier material contains at least one coloring agent and at least one coloring agent, the following examples may be mentioned:

• - JAUNE LEVACELL 3 GX from BAYER in combination with a basic solution;
• - SAFRANINE O with a sodium hypochlorite solution.

Further, the chemical decolorizing and repainting agents can be supplemented or replaced by physical measures having the same effect. For example:

• actinic rays, such as UV and / or IR rays,
• - heat,
• - electron bombardment,
• - action of a laser beam,  
• - Treatment with ultrasound or microwaves
• - and the like.

The fibrous value character carrier according to the invention can also be defined by its specific physical properties. Thus, it advantageously has a surface-specific mass of 80 g / m ² or more, preferably from 100 to 400 g / m ² and in particular from 120 to 300 g / m ² . The basis weight of paper is an important parameter in terms of the permeability of decolorizing agents / staining agents. By this parameter, it is determined that these agents penetrate into the interior of the fibrous carrier material to a sufficient depth so that the color change can be seen. It will be appreciated, however, that the penetration depth must not be too great to ensure that the darker or differently colored central portion is maintained, the thickness of which permits tearing inspection.

This control of the depth of penetration of the decolorizing agent can also be achieved by changing the degree of fine grinding of the fibers forming the substrate and thus its porosity and sizing, ie the ability of Materi as for subsequent rewetting by the Entfärbungslö solution / color change solution. The degree of fine grinding of the fibrous carrier material is preferably from 15 to 55 ° SR (SHOPPER RIEGLER) and in particular from 30 to 45 ° SR. Of course, the degree of fine grinding also depends on the grammage of the paper. The person skilled in the art can itself determine the appropriate values of these parameters associated with each other. As far as sizing is concerned, the agent used may be conventional rosin, a dimeric alkyl ketene or any other product capable of achieving a conventional value for this parameter of 15 to 30 g / m ² (COBB value) and in particular from 16 to 20 g / m ² allows.

Below is in the context of the process description to another important factor in terms of penetration Property, namely the viscosity of the liquid containing the decolorizing agents / coloring agents.  

In any case, these parameters can vary widely depending on the basis weight of the candidate fiber carrier. In fact, there are differences in the penetration of the decolorizing agent / colorant between a product having a weight basis weight of less than 120 g / m ² and a product having a high basis weight of more than 200 g / m ² . In the latter case, it is very rare that the decolorization / color change solution penetrates even without special precautions on the substrate to the core of the sheet and the paper decolorized in its entire thickness or changed its color.

According to a preferred embodiment of the invention If you bring a paper or a fibrous carrier material a dyed interior and a reinforced opaque conditions by adding an intense stain tel that is capable of producing a dark color (e.g. Brown: manganese oxide).

According to the invention, the candidate fibrous Token Carrier Material Any Fiber Composition exhibit: it can be pure cellulose fibers or part wise consist of synthetic fibers. traditionally, For example, suitable cellulose fibers may be fibers Hardwood, coniferous fibers or mixtures thereof han spindles. The synthetic fibers may be, for example example, polyester fibers, polyamide fibers or Polyolefinfa act.

In practice, the proportion of synthetic Fa with respect to the total dry weight of cellulose fa fibers and synthetic fibers 10 to 30% by weight and preferably 15% by weight.

Advantageously, the fibrous carrier material according to the invention for papermaking can contain conventional additives, ie

• inorganic or organic fillers, such as kaolin, Calcium carbonate, talc and the like,  
• - Resins or means to achieve different strength keits- or resistance properties, in particular to Erzie moisture resistance,
• Binders, such as starch and carboxymethylcellulose to improve the mechanical properties of the paper,
• Coloring agent for achieving color shades,
• - neutral, acidic or basic sizing agents (Aluminum sulfate for acid sizing or pH adjustment),
• - and the like.

Furthermore, it is according to the invention into consideration in the In The fibers of the fibrous carrier additional check to bring in medium. For example, it may be colored or non-colored, fluorescent or non-fluorescent security threads, platelets or fibers, as well as to ensure anti-counterfeiting In Water insoluble but soluble in organic solvents In the pigment state, dyeing agents are applied to the fibers gene carriers applied labels or on print by means of extinguishing devices containing organic solvents to protect against counterfeiting attempts.

Finally, in the fibrous Trä invention germaterial numerous additives are contained under the Provided that they are not affected by the decolorization tel / staining agent that enters the interior of the fibrous carrier have to penetrate materials are degradable.

According to a further aspect, the invention also relates to a method for producing a fibrous carrier material and in particular of paper, which consists in particular of one and the same fiber mat, in particular is homogeneous in thickness, is opaque and at least one (preferably only one) colored in thickness mid-section and at least one (preferably two) outer sections which are white or differently colored and / or less dark compared to the central section, the method being characterized in that it consists essentially of the following steps consists:

• 1) producing a pulp, preferably a Pa pulp, incorporating at least one staining agent means of,
• 2) Provide this slurry in the form of a carrier terials consisting of one and the same fibrous web, which is created by forming a single fiber web,
• 3) removing at least a portion of the in the carrier material contained in the water and
• 4) discoloring and / or refining at least one outer ren section of the substrate sheet before, during or after the elimination of the water.

Such a method enables the production of the fibrous carrier material which is the subject of the above represents described invention.

According to a preferred embodiment of the method The fibrous carrier material (eg the paper) has one colored, approximately in the middle lying section and on the On both sides an outer section, colored white is or one compared to the middle section below has different and / or less dark color, on. These both outer sections have the same or different different colors. According to a preferred embodiment discoloration and / or staining by means of chemical and / or physical means.

Such a fibrous carrier material corresponds to the preferred embodiment of the product according to the invention, which has been described above and in the appended one Zigen figure is shown.

Stage 1 for making the pulp corresponds a relatively conventional process in the field of Pa pierherstellung. In a paper machine this Vor done in the area of the headbox or during work position of the pulp in the pulper. In the present case this process consists in the simple addition at least a coloring agent to the pulp and in the production a homogeneous mixture.

Stage 2 is done by means of the nozzle of the headbox at least the paper machine that allows one  monolayer web of a fiber mat containing the colorant contains, this mat then the Dewatering device, the pressing device and then the Drying device is supplied to the paper machine. These three institutions have the task in stage 3 the Removal of existing in the substrate web water to ensure.

In the event that a discoloration and / or a chemi cal coloration is carried out according to a Favor th embodiment of the method according to the invention Stage 4 by means of a bath with a decolorizing agent and / or staining agent using a device, which is preferably provided in the paper machine, pre accepted. According to a particularly preferred embodiment this device is a conventional one Size press, z. As a "blade metering size press" or a "Gate-roll". Such a size press is usually used after predrying.

For the less favorable case that the treatment with the decolorizing or coloring bath at the exit of the Pa It is possible to use the appropriate machine Coating devices use process coupled, z. B. Devices with a metal blade or an air knife, or apply conventional printing techniques. It is on it to point out that instead of the aforementioned conventional measure took any appropriate measures to coloring solution / coloring solution in the fibrous carrier rial can be used, can be used.

Of course, the concentrations of mit For decolorization / color change in the treatment bath depending speed of the amount contained in the fibrous carrier material NEN colorant and depending on the stoichiometry the appropriate response. This implementation Measures are in the knowledge of the skilled person.

As for the type of colorants as well as the decolorization pertaining to the description and Definitions as described above in Des  which deals with the fibrous substrates as such concerned, directed.

As already stated, the penetration of the Decolorizing or Umstärbungsmittels in the interior of the fibrous carrier material a prerequisite for the he inventive method. In the parameters in this regard allow a control, it is a on the one hand, the area-related mass, the degree of fineness and the Gluing of the fibrous carrier material and on the other hand to the Viscosity of the treatment bath. So the viscosity of the Solution for decolorization / discoloration set by the Dry matter changed and / or film-forming binder (Starch, cellulose and the like). This setting The viscosity will vary depending on the nature of the reactant tengase for discoloration / color change and depending on its reactivity made.

Of course, the parameters that are on the one urgency of the decolorization / colorant agent, interdependent. So must the viscosity of the treatment The lower the area-related mass, the higher it will be of the fibrous carrier material.

In practice, the following examples can be given:

• for a basis weight of 120 g / m ² , the viscosity of the bath is advantageously 100 mPa.s or more,
• - For a basis weight of 150 g / m ² , the viscosity is preferably 80 mPa.s or more and
• - For a basis weight of 200 g / m ² , the viscosity of the bath is advantageously more than 30-50 mPa.s.

As examples of a water-soluble binder mention: carboxymethylcellulose, starch and polyvinyl alcohol, which are natural and preferably ver used binder, but synthetic binder medium, such as acrylic latices or styrene-butadiene latexes not excluded are.

Advantageously, for stage 4, in the case of discoloration / staining by chemical means, a pair of coloring agent / decolorizing agent and / or coloring agent is used from the following group:

colorants Decolorizing agent and / or coloring agent metal reducing agent metal salt masking agents colored pH indicator Medium with the chosen pH colored redox indicator Medium with the selected redox potential coloring agent Means for degrading the colorant and mixtures thereof

According to a preferred embodiment, the following applies:

• - the decolorizing / coloring agent is to a chemical agent,
• - The fibrous carrier material is Pa pier, which was made with the help of a paper machine is and
• - for carrying out stage 4 you bring the means for decolorizing / coloring in and / or outside of Papierma on at least one of the outer sides of the track, and Although preferably using one of the following Einrichtun conditions: size press, wetting system or coating system.

The invention is also the use of the fa serigen carrier material, for example, the above Definition corresponds or according to the above method has been obtained for the production of by tearing verifiable security paper, for example, from scratch cards or lots for instant lotteries.

The present invention also relates to a by tear testable security paper marked thereby is that it in particular from the fibrous Trägerma material that complies with the above definition and / or according to the method described above has been.

Finally, the present invention relates to a rub card, which is characterized in that it insbeson  dere consists of the fibrous carrier material, the before according to the definition and / or according to the above has been obtained.

The fibrous carrier material according to the invention can be used as Securities paper are used, the following property having: by tearing verifiable, opaque, non-delaminatable, low cost and perfect suitable for counterfeit-proof and by tearing verifies bare documents and for no possibility of deception Scratch cards accessible to review.

The following examples are for the more detailed explanations tion of the invention, without limiting this.

Examples example 1

As a colored indicator phenolphthalein dissolved in an aqueous alcoholic medium in an amount of 2%, based on the dry pulp, fed to a pulp in a mixing device. The pulp consists of 50% pulp of hardwood and 50% of softwood pulp, brought to a degree of comminution of 30 ° SR and has a pH of 11. It develops a tensive pink color. On the paper machine, a dyed paper carrier material of 250 g / m ^{2 is} produced. The size press is supplied with a dilute sulfuric acid solution in such a manner that the pH of the surface of the paper decreases and thereby the pink color of the carrier material is eliminated. The resulting paper is white on the outside and pink in the middle. The paper can be checked by tearing over. The absorption in the sizing bath is 30% by weight, based on the dyed paper carrier material.

Example 2

A verifiable ticket is prepared by introducing into the stock the colorant BLEU DUASYN POUR ENCRES BJT Fa. HOECHST in an amount of 0.2 wt .-%, based on the dry pulp, wherein the pH of the pulp with Acid is set to 4. The thus prepared blue paper having a surface mass of 300 g / m ² is fed to the sizing press of the paper machine where the bath indicated below is applied in an amount of 20% by weight based on the paper:
Starch: dry weight 15% by weight, based on the treatment bath,
12 ° sodium hypochlorite solution (12 ° javel): 15% by weight, based on the treatment bath.

After drying, the paper is on its outsides white and blue inside. By tearing is a direct visual verification allows. Furthermore, the paper can with the special colorant by a second measure be checked: the application of a piece of felt with extinguishing ink or a basic solution on the inner colored Part allows discoloration of this part.

Example 3

A forgery-proof ticket is obtained by contacting the blue backing paper of Example 2 was treated with a bath delt, the 10% sodium sulfite, based on the bath instead of sodium hypochlorite solution. You get the same Final product.

Example 4

A colored paper of 200 g / m ² serving as a support material is prepared on a paper machine using the dyeing agent JAUNE LEVACELL 3 GX from Bayer. The yellow paper prepared in this way is fed to a size press with a dilute solution of sodium hydroxide in such a way that a red coloration results on the surface of the paper. The coloration in the interior of the web remains yellow. The paper is verifiable by tearing. However, the colored paper thus obtained has the disadvantage that it can not be easily used for various printing purposes.

Example 5

A carrier paper with 250 g / m ² , which contains 3% manganese oxide, bezo conditions on the dry pulp, is strongly colored brown. This carrier material is the size press with a weakly acidic solution of formamidinesulfinic acid (5%, based on the treatment bath), which contains as binders for the bath high viscosity carboxymethylcellulose (0.7% dry weight, based on the treatment bath) supplied. The inclusion in the sizing bath is 30 wt .-%, based on the backing paper. The finished paper is white on the sides and brown in the middle. Such a paper has a greatly improved opaque texture. Even with strong lighting, it is practically impossible to recognize characters applied to the back of the paper, while a paper with equivalent area-related mass does not have this feature. This white product is printable and can thus be used as a carrier paper for lots for instant lotteries, without it being necessary to take an adhesive bond with an aluminum foil vorzu to prevent viewing.

Claims (12)

An opaque, fibrous carrier material ( 1 ), in particular of paper, characterized in that it has been obtained from one and the same fibrous mat, which has the following properties:

• - Homogeneous nature, in particular with respect to the thickness;
• - product of a single fiber web; and
• initial staining (C ₂ ), then discoloration or different staining, at least in part on at least one of the sides, to form at least one outer portion ( 3 , 4 ) which is white or has the color (C ₁ , C ₃ ), which is different and / or less dark compared to the initial color (C ₂ ).

2. A fibrous carrier material according to claim 1, characterized in that it has been obtained from one and the same fibrous mat, which has the following properties:

• - Homogeneous nature, in particular with respect to the thickness;
• - product of a single fiber web; and
• initial staining (C ₂ ), followed by discoloration or other discoloration, at least in part on at least one of the sides, on the one hand at least one outer section ( 3 , 4 ) which is white or has the color (C ₁ , C ₃ ) in the Compared to the initial color (C ₂ ) is different and / or less dark, and on the other hand at least one approximately in the middle section ( 2 ) having the color (C ₂ ) on.

3. A fibrous substrate according to claim 1 or 2, characterized in that it comprises a colored, approximately in the middle section ( 2 ) having the initial color (C ₂ ) and on its two sides to an outer portion ( 3 4 , which is white or different and / or less darkly colored (C ₁ , C ₃ ), the color (C ₂ ) of the central portion ( 2 ) and the colors (C ₁ ) and (C ₃ ) of the outer portions ( 3 ) and ( 4 ) located on both sides of the central portion ( 2 ) are the same or different. 4. fibrous carrier material according to claim 1 or 2, characterized in that it comprises at least one coloring agent and optionally at least one decolorizing agent and / or contains at least one colorant that does not react has, but to the reaction with the colorant in the outer Capable of sections. 5. The fibrous carrier material according to claim 4, characterized in that the pair of colorant / decolorizing agent and / or colorant is selected from the following group:
colorants Decolorizing agent and / or coloring agent metal reducing agent metal salt masking agents colored pH indicator Medium with the chosen pH colored redox indicator Medium with the selected redox potential coloring agent Means for degrading the colorant and mixtures thereof 6. fibrous carrier material according to one of claims 1 to 5, characterized in that its basis weight is 80 g / m ² or more, preferably 100 to 400 g / m ² and in particular 120 to 300 g / m ² . 7. A process for producing a fibrous Trägerma terials ( 1 ), preferably made of paper, which consists in particular of one and the same fibrous mat, in particular with respect to its thickness is homogeneous, is opaque and in the thickness direction at least one (preferably only one) ge dyed , approximately center portion ( 2 ) of an initial color (C ₂ ) and at least one (preferably two) outer portions ( 3 , 4 ) that are white or different from the middle portion ( 2 ) and / or we niger are dark (C ₁ , C ₃ ), characterized in that it consists essentially of:

• 1) producing a pulp, preferably a paper pulp, incorporating at least one dyeing agent,
• 2) providing this slurry in the form of a carrier material consisting of one and the same fibrous web formed by forming a single fibrous web,
• 3) removing at least a portion of the material contained in the carrier web water and
• 4) discoloring and / or recoloring at least one äuße ren section ( 3 , 4 ) of the substrate sheet before, during or after the removal of the water.

8. The method according to claim 7, characterized in that the intended fibrous carrier material (for example the Pa pier) an approximately in the middle section ( 2 ) with the color (C ₂ ) and on both sides outer portions ( 3 , 4 ) which are white or different in color and / or less dark compared to the middle section ( 2 ) (C ₁ , C ₃ ), the colors (C ₁ , C ₃ ) of the two outer sections ( 3 , 4 ) are the same or different. 9. The method according to claim 8, characterized in that in the case of a discoloration / coloration by chemical means a pair of colorant / decolorizing agent and / or coloring agent, which is selected from the following group, verwen is used:
colorants Decolorizing agent and / or coloring agent metal reducing agent metal salt masking agents colored pH indicator Medium with the chosen pH colored redox indicator Medium with the selected redox potential coloring agent Means for degrading the colorant and mixtures thereof 10. The method according to any one of claims 7 to 9, characterized characterized in that it is the decolorizing / Umfär The chemical agent is a chemical agent at the fibrous carrier material by means of a paper machine  made paper and that the means for Ent Coloring / coloring in and / or outside of the paper machine on at least one of the outer sides of the web applies, before preferably using one of the following facilities: glue press, wetting system or coating system. 11. Markable security paper by tearing, characterized in that it consists in particular of a fiber gene carrier material, which is one of claims 1 to 6 corresponds and / or according to the method of one of claims 7 until 10 has been received. 12. scratch card, characterized in that they esp special consists of a fibrous carrier material, the one of claims 1 to 6 and / or according to the method one of claims 7 to 10 has been obtained.