Method to make paper with counterfeit protection, with locally arranged protective elements, device to make paper and paper with counterfeit protection, with locally arranged protective elements

FIELD: textile, paper.

SUBSTANCE: paper with counterfeit protection is used in production of securities and documents. Method to make paper with locally arranged protective elements includes formation of the first paper cloth on the first meshy cylinder. Deposition of water dispersion containing protective elements via nozzles at certain sections of moist paper cloth. Formation of the second paper cloth at the second meshy cylinder. Joining first paper cloth with deposited protective elements with the second paper cloth, and also pressing and drying. Water dispersion of protective elements contains at least one water-soluble polymer in amount of 0.1-3.0 wt %. At the same time dispersion of protective elements is supplied with controlled speed via nozzles, every of which is equipped with pump of auger type.

EFFECT: increased quality of paper due to reduction of pulsations of flow dispersion and increased stability of protective elements deposition process in strictly required amount at certain sections of paper cloth.

8 cl, 1 dwg, 1 tbl

 

The invention relates to pulp and paper production, in particular to the manufacture of paper, protected from fraud, which contains protective elements placed in certain areas of the paper web. The paper is protected from a fake, used in the manufacture of valuable papers and documents requiring a high level of protection against forgery, such as banknotes, passports, driving licenses etc.

There is a method of making paper (WO 96/14496, 17.05.1996), in which the protective elements in the form of fibers, particles, etc. are entered into certain areas of the paper web in the zone of molding using a liquid medium with adjustable flow rate. Is quite high accuracy of the introduction of protective elements on specified areas of the paper web with maintaining the constancy of the concentration of protective elements on these sites.

The main disadvantage of this method is the immersion of the metering tubes through which protective elements serves on the not fully formed paper web, into the tank of the grid cylinder, which increases the likelihood that a number of protective elements in pulp and paper. In addition, a large part of the protective elements in this case is in the top layer of paper, making them plucking in the printing process.

The use of polymeric materials in the production of counterfeit-protected paper is known, for example, from the patent RU 2265524, 2004 (Convention priority: 05.07.2000 (claims 1 to 73) DE 10032128), according to which the use of the polymer film substrate of the protective element.

Known solution, in which when printing a protective element for paper use lacquer, which mainly represents the polymer, preferably, the cellulose type and/or metal type, and/or plastic-type/plastic-type coating applied by vacuum metallization. The polymer, for example, is a mixture of nitrocellulose resins, preferably of nitrospira, supplemented resins, improves resistance to subsequent processing of lacquer, for example, gum Arabic, and rosin. The polymers can also be a mixture of resins, supplemented by one or more adhesion promoters, preferably butylacetoacetate.

In another embodiment, the varnish is insoluble and is a nitrocellulose polymer containing filler, the nature of which varies depending on the subsequent functions of the mark, in particular, the use of pigments or conductive or insulating fillers such as metal oxides, preferably titanium oxide, iron, boron, Nickel, chromium, carbon black, oxide credit the Deposit, in its pure form or in mixtures. The lacquer is advisable to carry out by any means for printing capable of varnish with high accuracy and high resolution EN 2243903, 2005 (publication PCT WO 01/08901, 08.02.2001).

However, the known methods aimed at solving some technical problems.

Closest to the claimed technical solution proposed in the document WO 2005/124023 A1, 29.12.2005, which describes a device and a method of manufacturing a tamper-resistant paper. The device includes a main grid cylinder for forming the first layer of the paper web, the site of deposition of protective elements containing the nozzles, the node maintaining vacuum in the area of deposition of the protective elements, the auxiliary grid cylinder for forming the second layer of the paper web, the cone constant pressure connected to the nozzles of the site of deposition of protective elements, the cumulative capacity for accumulation of protective elements, a pump for feeding the dispersion of the protective elements of the cumulative capacity in the cone of constant pressure.

A method of manufacturing a tamper-resistant paper (WO 2005/124023 A1, 29.12.2005) includes forming the first paper web on the main grid cylinder, settling on certain parts of the wet paper web aqueous dispersion containing protective elements, the via nozzles, forming a second paper web on the auxiliary grid cylinder, a connection of the first paper web besieged with security elements from the besieged protective elements with the second paper, pressing and drying the obtained paper. The main disadvantage of this method is the difficulty in transporting and applying the dispersion with a concentration of protective elements more than 0.4 wt.% on the first layer of the wet paper web, especially if the protective elements are fibers with lengths greater than 5-6 mm, as well as fibers, particles, plates with a specific gravity more than 2-3 g/cm3. This leads to fluctuations and fluctuations in the feed rate of dispersion, as well as education on paper plots with insufficient or, conversely, excessive content of protective elements. In addition, when used in the composition of the dispersion of two or more kinds of protective elements different specific gravity, shape, size, there is an uneven deposition on the paper web in the borders of zones of different width, which impairs the ability of joint control of these protective elements, especially when using a machine-readable methods.

Known technical solution provides centralized supply of variance protective elements (hereinafter referred to as the variance) in the nozzle node grease the protective elements with a diffuser constant pressure. Thus the dispersion in the mixture with air is first fed into the diffuser constant pressure through the inlet manifold and then through the output reservoir flows in the nozzle of the site of deposition of protective elements. The disadvantages of the known technical solutions are ripple input flow in the diffuser due to the operation of the pump and the gradient of the velocities of the flows between different feed pipes. With a small amount of the supplied fluid pulsation flow becomes critical, which leads to the disturbance of the uniformity of the feed dispersion and deposition of protective elements on paper canvas.

The objective of the proposed technical solution is the improvement of the quality of paper by reducing the pulsation flow of the dispersion and stability of the deposition of protective elements in strictly necessary quantities in certain areas of the paper web.

For solving the problem proposed objects presented in the independent claims. Preferred embodiments of the invention are given in the respective dependent claims.

A method of manufacturing counterfeit paper with locally placed protective elements, including the formation of the first paper web at the first mesh cylinder, settling on certain parts of the wet boom is mportant canvas water dispersion, contains protective elements, through a nozzle, forming a second paper web on the second mesh cylinder, the connection of the first paper web besieged with security elements from the besieged protective elements with the second paper, pressing and drying the obtained paper web according to the invention aqueous dispersion of protective elements contains at least one water-soluble polymer in an amount of 0.1 to 3.0 wt.%, thus the variance of protective elements served with variable speed through a nozzle, each of which is provided with a screw pump type.

Preferably, the feed rate of dispersion of the protective elements is 0.5 to 5.0 l/C. In particular, as a water-soluble polymer used sodium carboxymethyl cellulose or polyvinyl alcohol. The aqueous dispersion may contain two or more kinds of protective elements different specific gravities, and/or shape and/or size.

The proposed device for the manufacture of paper, tamper with locally placed a protective elements, including a first mesh cylinder for forming the first paper web, the cumulative capacity for accumulation of dispersion of protective elements associated with containing jets host the application of protective elements on the first paper floor the IDT, the node maintaining vacuum in the area of deposition of the protective elements, the second mesh cylinder for forming the second paper web and the collecting grid to move the first paper web from the first mesh cylinder to the second mesh cylinder according to the invention, the host application of the protective element contains a group of pumps screw type, each of which is connected to the nozzle with adjustable feed speed dispersion of protective elements in the nozzle.

Preferably, the device further comprises a control unit, which is connected to each of the pumps to control the feed rate of dispersion of protective elements in the nozzle. Mainly, the number of nozzles equal to the number of pumps.

The paper suggested, tamper with locally placed a protective elements that are declared by way of the claimed device.

To eliminate fluctuations and variations in the feeding speed dispersion are encouraged to submit their dispersion directly in the nozzle of the site of deposition of protective elements, connecting them with a storage capacity directly. The flow of the dispersion can be carried out with the help of the pump screw type, which before the pumps of other types is the lack of dependence of the rate of flow of the dispersion to accumulate Inoi capacity. The performance of the pump screw type can be adjusted in a wide range by changing the speed of the auger. Most preferably, the pump performance when applying the dispersion was maintained in the range of 0.5 to 5.0 l/s With lower productivity, it is impossible to provide the necessary concentration of protective elements on the paper sheet. When the pump capacity greater than 5.0 l/s having trouble maintaining a constant concentration of protective elements on paper canvas.

Preferably, the number of pumps in a group is equal to the number of nozzles in the site of deposition of protective elements. The performance of each pump is individually adjustable by means of a pump control unit.

It is proposed to modify the viscous flow characteristics of the dispersions of protective elements the addition of water-soluble polymers such as sodium salt of carboxymethyl cellulose, polyvinyl alcohol, etc. in Addition to these, it is acceptable to use other water-soluble polymers to regulate viscous flow characteristics of the dispersions. For example, you can use a water-soluble cellulose ethers such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, etc. are the Concentration of water-soluble polymers in the dispersion is maintained within the range of 0.1 to 3.0%. Reduction of concentration is the radio less than 0.1% contributes to the deterioration of the fluidity of dispersions and cause difficulties during transportation and feeding the paper web. At a concentration of more than 3.0% is observed a significant increase in the viscosity of the dispersion affecting the efficiency of the site of deposition of protective elements. In each case the concentration of the water-soluble polymer is selected individually, taking into account its properties and characteristics of protective elements, such as their concentration in the dispersion, shape, specific gravity, size, etc.

In the manufacture of a dispersion, it is advisable to first prepare a solution of water-soluble polymer and then dispersing it necessary protective elements, which can be a fiber, a particle, characterized by magnetic, fluorescent, thermochromic, photochromic, or other properties. Moreover, in the manufacturing process dispersions can be used and other additives, such as wetting, surfactants, defoamers, etc.

The claimed technical solution is as follows.

The drawing shows the General scheme of the claimed device.

The device contains a cumulative capacity of 1 for variance of protective elements connected to the group of pumps screw type 2 and site of deposition of protective elements to the nozzle 3, the first mesh cylinder 4 for forming the first sheet 6A, the second mesh cylinder 5 for forming the second sheet 6b, with beauduy grid 7 to move the first paper web from the first mesh cylinder to the second mesh cylinder, the node maintaining vacuum 8 in the zone of deposition of protective elements, and the control unit 9 pumps.

The claimed device operates as follows.

Pulp is prepared by one of the known methods used in the pulp and paper industry. Aqueous dispersion of protective elements is stored in the storage capacitor 1, which is connected with pumps screw type 2 for feeding the dispersion in the nozzle 3. Pulp precipitated on the surface of the mesh cylinders 4 and 5, where under the action of vacuum formed into the first 6A and second 6b layers of wet paper web. Formed on the first mesh cylinder 4, the first layer 6A wet paper web is transferred to the collecting grid 7 and is brought to the site of deposition of protective elements with nozzles 3, located opposite the site 8 maintaining vacuum in the area of deposition of the protective elements. From the accumulation tank 1 via dosing pumps screw type 2 serves the variance of the protective elements to the injectors 3. The dispersion contains at least one water-soluble polymer, the content of which is shown in table 1. The dispersion through a nozzle 3 is fed to the first layer 6A wet paper web opposite the site 8 maintaining vacuum in the area of deposition of the protective elements. Protective elements under the influence of vacuum deposited on the first layer 6A wet b is per leaf, which then moves to the collecting grid 7, is connected with the second layer 6b wet paper web and subjected to further processing (extrusion, drying, etc. on the technological equipment. The feed rate of dispersion of the protective elements regulate with the help of block 9 of the pump control.

In all examples as protective elements in the dispersion contains fibers with the following characteristics: length - 6.5-7 mm, specific weight of 2.6 g/cm3the concentration was 0.68%.

As can be seen from the table, the addition of a dispersion of polyvinyl alcohol and sodium salt of carboxymethyl cellulose in the amount provided by the invention (examples 4, 5), allows comparison with the prototype (example 1) to obtain a good uniformity of deposition of the protective elements on paper canvas.

ExampleWater-soluble polymerThe uniformity of deposition of the protective element∗
TypeFeaturesConcentration %
1 (prototype)---poor
2Polyvinyl alcohol : The degree of polymerization of 1,100-1,200 Degree of hydrolysis of 98.5-99,20,07poor
3Sodium salt of carboxymethylcelluloseThe degree of polymerization of 250 to 300 Degree of substitution 65-750,05poor
4Polyvinyl alcohol : The degree of polymerization of 1,100-1,200 Degree of hydrolysis of 98.5-99,22,1good
5Sodium salt of carboxymethylcelluloseThe degree of polymerization of 250 to 300 Degree of substitution 65-750,8good
* is determined on a paper canvas visually.

Thus, this technical solution allows to besiege in certain areas of the paper web in the required number of protective elements. The result is the elimination of the difficulties of transporting and feeding the paper web dispersions of protective elements and sledovatel is, improving the quality of the paper.

1. A method of manufacturing a tamper-resistant paper with locally placed protective elements, including the formation of the first paper web at the first mesh cylinder, settling on certain parts of the wet paper web aqueous dispersion containing protective elements, through a nozzle, forming a second paper web on the second mesh cylinder, the connection of the first paper web besieged with security elements from the besieged protective elements with the second paper, pressing and drying the obtained paper web, wherein the aqueous dispersion of protective elements contains at least one water-soluble polymer in an amount of 0.1 to 3.0 wt.%while the variance of protective elements served with variable speed through a nozzle, each of which is provided with a screw pump type.

2. The method according to claim 1, characterized in that the feeding speed of the dispersion of the protective elements is 0.5 to 5.0 l/C.

3. The method according to claim 1 or 2, characterized in that as the water-soluble polymer used sodium carboxymethyl cellulose or polyvinyl alcohol.

4. The method according to claim 1 or 2, characterized in that the aqueous dispersion contains two or more kinds of protective elements different specific gravities, and/or form is/or size.

5. Device for the manufacture of paper, tamper with locally placed a protective elements, including a first mesh cylinder for forming the first paper web, the cumulative capacity for accumulation of dispersion of protective elements associated with containing jets host the application of protective elements on the first paper web, site, maintain vacuum in the zone of deposition of protective elements, the second mesh cylinder for forming the second paper web and the collecting grid to move the first paper web from the first mesh cylinder to the second mesh cylinder, characterized in that the site of deposition of protective elements contains a group of pumps screw type, each of which is connected with the nozzle with adjustable feed speed dispersion of protective elements in the nozzle.

6. The device according to claim 5, characterized in that it further comprises a control unit, which is connected to each of the pumps to control the feed rate of dispersion of protective elements in the nozzle.

7. The device according to claim 5 or 6, characterized in that the number of nozzles equal to the number of pumps.

8. The paper is protected from a fake, with locally placed protective elements made by the method described in any one of claims 1 to 4 using the device, characterized by small, high is spent in any of pp.5-7.



 

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4 cl, 3 dwg

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