Counterfeit-protected security paper and method for manufacturing counterfeit-protected security paper

FIELD: special-purpose paper types.

SUBSTANCE: method involves treating a part of suspension ingredients, selected from cellulose fibers or powder-like filler, with a color-producing reagent.

EFFECT: enhanced protection effectiveness; reduced reagent consumption.

5 cl

 

The invention relates to the production of valuable papers, banknotes, documents, and other paper types with protection from fraud through the introduction of chemical reagents.

Known securities, consisting of a base paper coated with a mixture of color-forming dye in lakatoro, filler (e.g., chalk) and a binder (starch, latex). Thus svetoprestavlenie carry out a stamp with a mixture of dark colors and reagent acidic nature of the formation around the dark colorful print colored halo D. the Process is due to the chemical interaction of color-forming dye and reagent acidic nature (GB 1507454, 12.04.1978 year).

Also known paper, protected from tampering and unauthorized manufacture, consisting of a base paper and a coating containing a metal salt that changes when heated, its color (FR 2643661, 31.08.1990).

There is a method of marking materials using ink that changes color when handling bleach. Ink contains two dye ink capacity of one of them deteriorates in the presence of bleach, and the second retains its characteristic color (Patent US 5232494, 1993).

However, these methods do not provide a sufficient degree of protection.

There are ways to protect documents special purpose by introducing material is local trademarks.

For example, in the material enter the security thread of synthetic thermoplastic polymers, which consists of 2-3 integrated twisted yarns, Straseni and twisted together, the original pneumatic function fittings composite yarns have the same linear density of 20-30 Tex, the number of pneumovirinae 20-50 per 1 m and twist 420-600 spins at 1 m, and one filament yarn colorless or colored visible in daylight, dyes, and other threads painted luminescense dyes, the concentration of the dye in each thread is 0.01-1.5 wt.% (EN 2216613, 20.11.2003 g).

A known method of manufacturing securities with a protective thread, according to which the pure cotton fiber in the form of cleaned raw cotton and fluorescent fibers are introduced into the pulp mass in the process of manufacturing paper pulp. Cotton fibers comprise from 10 to 30% of the total mass and form the internal fiber matrix and are included in the paper the thread is firmly connected to the internal fiber matrix (RU 2170788, 20.07.2001).

The known method of introducing labels directly in the fiber and textile yarn method of dyeing. The label represents the chelates of rare earth elements. Colorless when sunlight or artificial light fibrous strands begin to fluoresce under the UV light, and the wavelength of fluorescence of izmenaetsa.v dependence on temperature and is an important feature of a specific tag (Patent US 5118349, publ. 1992).

The above methods are difficult to perform and expensive.

Famous paper, protected from tampering, containing at least two chemical reagent, each of which is designed in such a way that ensures the flow of the color reaction of the chemical reagent with the indicator of authenticity with a speed that does not match the velocity of the color response of each of the other chemicals with this indicator of authenticity, the color of at least one of the reaction products of each chemical reagent indicator of authenticity is different from the color of at least one of the reaction products of each of the other chemicals with this indicator of authenticity (EN 2222655, 27.01.2004,).

The closest in technical essence and the achieved result is a method of manufacturing paper, protected from fraud, according to which a paper slurry introduced a water-soluble compound which has a color-forming properties of a chemical reagent capable of forming the reaction products of a certain color when interacting with a color indicator, and cast the paper web. Moreover, in the preferred embodiment, coupler connection is not transferred to water-insoluble form (RU 2229547, 27.05.2004,).

One drawback is use ways including how the prototype, is the high consumption of chemical reagents, as well as failure to implement local protection of paper.

The present invention is to develop a cost-effective method of manufacturing a tamper-resistant paper, reduced reagent consumption, while ensuring a high level of protection of paper.

The problem is solved by the described method of making paper, protected from tampering, comprising preparing a suspension of paper pulp, its protective processing of at least one color-forming reagent to obtain the compound capable of forming reaction products of a certain color when interacting with a color indicator, and the sheen of the paper web takes place simultaneously with the introduction of variance components subjected to protective treatment, the raw slurry paper pulp containing the remaining components, and specified maintenance perform zonal given to the areas molded sheet of paper.

Preferably at low tide the paper web is injected from 0.3 to 1.0%of the variance components subjected to protective treatment.

Preferably processed by the reagents of the components of paper pulp is 1-10 weight % of the total number of components supplied to ebb bananaparty.

The method provides for processing color-forming reagent with translation in water-insoluble form in several stages with each stage of the various reagents.

The problem is solved paper also protected from a fake by the introduction of chemical reagents manufactured by the method described above.

Example 1.

Preparing a suspension of paper pulp, which contains long fibres bleached, white hydrophilic pigment (talc) and water.

In a separate container unground bleached long-fibre wood pulp in the amount equal to 10 weight % of the components of paper pulp impregnated with aqueous solution of iron (III) |FeC2About4)3| rate of 1 liter of 10% solution per 1 kg of fiber, then carry it into water-insoluble form by treatment with an aqueous solution of guanidine rate of 1 liter of 5% solution per 1 kg of fiber. Subjected to the described treatment of the fibers dissolve in water and in a 1%dispersion served on predetermined areas of the molded paper web with the aid of the known devices for zonal (strip) the introduction of protective components installed in the area of tide - papermaking machine company "Rosenthal". The number of obrabotannykh, introduced during the manufacture of paper, picked up, given the width of the protective strip. An indicator of the authenticity of the received paper serves as a 5% aqueous solution of sodium azide (NaN3). Trail marker with the indicator at the intersection of the strip with a reactive fibers is painted in bright orange color, which goes for 5 minutes in the yellow-brown.

Example 2.

Paper prepared as in example 1: unground bleached wood pulp impregnated in individual containers with a 10%aqueous solution of potassium iron (III) |Fe(C2About4)3| the rate of 1 litre of solution per 1 kg of fiber, then carry it into water-insoluble form by treatment with a 5%aqueous solution of polyhexamethylene guanidine rate of 1 liter per 1 kg of fiber. The resulting fiber is washed with water and dried from excess moisture on the net centrifuge, followed by processing in a separate container first 1%alkaline solution of thymolphthalein (pH indicator) at the rate of 2 liters of solution per 1 kg of the fiber, and then 1%sulfuric acid solution until neutral. When this occurs, the discoloration thymolphthalein and its translation into water-insoluble form. The resulting describes the processing of the fiber is diluted with water to a concentration of dispersion of 0.5% is fed to the device for their zonelog the introduction of paper - paper machine. The number of processed fibers entered at low tide, is 5% of the total weight of the paper pulp. An indicator of the authenticity of the obtained paper is 5%alkaline solution of sodium azide (NaN3)forming a complex protective reagent compounds in dark blue with the transition within 1-5 minutes in a yellow-brown color. The transition time is determined by the concentration of alkali in the solution of the indicator.

Example 3.

Prepare a paper weight for low tide. Part bleached cotton cellulose, intended for the manufacture of paper, impregnated in a separate container with 0.5%aqueous solution of dichlorophenolindophenol sodium (redox indicator) rate of 1 liter of solution per 1 kg of fiber, then the fiber is treated with a 1%aqueous solution of ascorbic acid to neutral reaction. When this occurs, the discoloration diclofenacisoprostol sodium and its translation into water-insoluble form. Obtained by reactive fiber is diluted with water to a concentration of dispersion of 0.3% and serves on the device for their zonal introduction in a paper in the amount of 1% on kruglosutochno paper machine.

Indicator of authenticity: acidified with 10% solution of odnovalentnogo potassium (KYO3)forming a protective reagent compound red-purple, rolling in for 1-5 minutes in blue. the time of transition is determined by the concentration of the acid solution and the alkaline paper filler (chalk).

Example 4.

Preparing a suspension of cellulose fibers for the manufacture of paper. In a separate container pigment talc, taken in the amount of 10% by weight of the fibers, impregnated with a 1%aqueous solution of dichlorophenolindophenol sodium at the rate of 1 litre of solution per 1 kg of the pigment, and then the pigment is treated with a 1%aqueous solution of ascorbic acid to neutral reaction. Obtained by reactive pigment is dispersed in a 5%aqueous solution of sodium carboxymethyl cellulose or other water soluble polymer to improve the stability of the dispersion) and, in the form of a 1%dispersion, served on the device for zonal introduction in the paper on kruglosutochno paper machine. Indicator of authenticity: acidified with 10%solution of odnovalentnogo potassium (KYO3)forming a protective reagent compound red-violet color transition within 1-5 minutes in blue color.

Example 5.

Paper prepared as in example 4, but the treatment machine chalk, which is impregnated in a separate container a 1%aqueous solution of 4-amino-1-naphthalene-sulfonate sodium at the rate of 1 litre of solution per 1 kg of the pigment followed by the addition of 1%aqueous solution of sulfuric acid until neutral. Obtained by reactive pigment is dispersed in a 5%aqueous solution of polyvinyl alcohol brand "Mowiol-40, and 1%of the variance, served on the device is about to zonal introduction in the paper on the paper machine. The authenticity of the paper is determined by a bright blue glow strip under UV - irradiation of the paper and the disappearance of fluorescence upon contact with an indicator of authenticity, which is used as acidified (pH 3-4) 10%aqueous solution of sulfanilic acid and sodium nitrite in 1:1 ratio. In places of contact of an indicator with a reactive pigment (4-amino-1-natalin the acid) is formed diazatricyclo orange color.

Example 6.

Preparing a suspension of paper pulp. In a separate container hydrophilic kaolin, in the amount of 1% by weight of the fibers, impregnated with a 2%aqueous solution of phosphate diphenylguanidine rate of 1 liter of solution per 1 kg of the pigment followed by the addition of 1%aqueous solution of alkali (NaOH or KOH) to slightly alkaline reaction (pH ˜8). The thus treated pigment was dispersed in a 5%aqueous solution of sodium carboxymethylcellulose in the form of a 1%dispersion serves on the device for zonal introduction in the paper on the paper machine. Indicator of authenticity: 10%aqueous solution of sodium hypochlorite (NaOCl), forming with diphenylguanidine connection is dark brown.

In the present invention solved the following tasks:

- achieved a high degree of protection and the complexity of the playback technology developed through the use of wagoners arimah reagent complex to decrypt the structure;

- ease of determining the authenticity of the product by the color of the reaction products protective reagents with colorless indicator solution, dressed in felt-tip pen;

- significant (tenfold) reduction of the cost of paper with chemical protection than the currently used method.

The method involves the introduction to the paper color-forming protective reagents, which are based on different mechanisms, redox, pH, etc. this permits the high degree of protection due to the introduction of two or more protective agents.

1. A method of manufacturing paper, protected from tampering, comprising preparing a suspension of paper pulp, its protective processing at least one color-forming reagent to obtain the compound capable of forming reaction products of a certain color when interacting with a color indicator, and reflux of the paper web, wherein the processing of the color-forming reagent is subjected to a portion of the suspension components selected from cellulose fibers or powder filler with the subsequent transfer of color-forming reagent in water-insoluble form, and the sheen of the paper web is carried out by introducing dispersions of the components subjected to protective treatment, niobra Tannoy suspension of paper pulp, containing the remaining components, and specified the introduction is carried out zone on specified areas of the molded sheet of paper.

2. The method according to claim 1, characterized in that at low tide the paper web is injected from 0.3 to 1.0%of the variance components subjected to protective treatment.

3. The method according to claim 1, characterized in that the processed reagents of the components of paper pulp is 1-10 wt.% of the total number of components supplied to the low tide of the paper web.

4. The method according to claim 1, characterized in that the processing of the color-forming reagent with translation in water-insoluble form is carried out in several stages with each stage of the various reagents.

5. The paper is protected from a fake by the introduction of chemical reagents, characterized in that it is made by the method described in claims 1 to 4.



 

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