METHOD FOR PRODUCING SAFETY (VARIANTS) AND SAID SAFETY PAPER (VARIANTS)

Abstract

 The invention relates to methods for producing a safety paper which is used for producing fraud-proof printing products. In the first embodiment, a method for producing a safety paper comprises the steps of: forming a paper web with a security strip having a width of more that 2 mm and being embedded into this web during the molding thereof on a wire-mesh cylinder, wherein the safety strip is introduced into a pulp in such a way that, prior to contact thereof with the cylinder, a fibrous layer is molded, except for areas on a cylinder surface where the layer is not formed for lack of filtering property. The security strip is positioned on the cylinder in such a way that a part of the surface thereof coincides with cylinder elements where the layer is not formed, and free access zones are formed as windows on a paper wire side. Areas devoid of filtering property are created on the cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh. The security strip is completely or partially exposed at a side opposite to a wire side, while through windows are formed at locations where the windows on the wire side and the complete or partial outs of the security strip on the opposite side of paper coincide. In the second, third and fourth embodiments, the method for producing a safety paper comprises the step of forming a paper web with a security strip of more than 2 mm in width thereby to provide outs of the security strip onto both sides of the paper web so as to obtain a through window effect.

Description

Field of the Invention

[0001] The invention relates to methods for producing safety paper which is used for producing fraud-proof printing product.

Background of the Invention

[0002] Methods for producing paper with a security strip-type element (in the form of thread) are known and differ from each other only by combining that or other factors in molding process. The following factors may be classified as basic ones: a type of a product to be molded; a method for introducing a strip element (into pulp or onto a dry cylinder before it enters the pulp); the strip element itself (geometrical parameters, a material, presence or absence of local water permeability, etc.). Apart from being a security means, the strip element in the thickness of paper may serve to improve its physical and mechanical properties and - as a consequence and an aim - to increase its lifetime.

[0003] RU 2,207,417 C1 is the closest prior art to the present application and relates to a method for producing paper with introduction of a strip element thereto and directly to a safety paper itself. This method for producing the safety paper comprises the steps of: forming a paper web with a safety strip having a width of more that 2 mm and being embedded into this web during the molding thereof on a wire-mesh cylinder, wherein the safety strip is introduced into a pulp in such a way that, prior to contact thereof with the cylinder, a fibrous layer is molded, except for areas on a cylinder surface where the layer is not formed for lack of filtering property; and positioning the thread on the cylinder in such a way that a part of the surface thereof coincides with cylinder elements where the layer is not formed, and free access zones are formed as windows on a paper wire side. Simultaneously with the formation of the first paper web with the security strip a second paper web is formed, and they are connected in such a way that the second paper web is superposed to a side of the first paper web opposite to the wire side.

[0004] The fundamental technical result of RU 2,207,417 C1 is provision for the possibility to increase the safety degree of paper and to improve the qualities thereof due to introduction of a security strip of more than 2 mm in width into the paper during the molding thereof. Apart from the presence of the strip itself in the paper, "window" outs of the thread onto a surface of any geometrical shape, width, and length are formed. In parallel with the molding of the first paper web into which the strip is laid, there is the molding of the second paper web superposed to the back, non-wire side of the first web.

[0005] The constraint of the present paper production method and the safety paper produced by the same is insufficient safety degree of the paper.

Disclosure of the Invention

[0006] It is an object of the present invention to provide different embodiments of methods for molding paper with introduction of a security element thereto as a result of which it is possible to create paper having the higher safety degree due to formation of "through windows" at a location where the security element lies.

[0007] The term "through windows" implies that a strip element introduced into the thickness of paper in a particular location of a paper sheet becomes accessible, exposed from the two sides of paper. A shape and length of said "through windows" may be arbitrary.

[0008] The problem posed is solved and the technical result is accomplished by a method for producing a safety paper, comprising the steps of: forming a paper web with a security strip having a width of more that 2 mm and being embedded into this web during the molding thereof on a wire-mesh cylinder, wherein the safety strip is introduced into a pulp in such a way that, prior to contact thereof with the cylinder, a fibrous layer is molded, except for areas on a cylinder surface where the layer is not formed for lack of filtering property; and positioning the thread on the cylinder in such a way that a part of the surface thereof coincides with cylinder elements where the layer is not formed, and free access zones are formed as windows on a paper wire side, wherein areas devoid of filtering property are created on the cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh, wherein the thread is completely or partially exposed at a side opposite to a wire side, and through windows are formed at locations where the windows on the wire side and the complete or partial outs of the security strip on the opposite side of paper coincide.

[0009] The method comprises the step of using the security strip having predetermined water permeability value over a surface area.

[0010] There method also comprises the step of using the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film.

[0011] There is the step of introducing an additional security element - watermarks and/or security fibers and/or confetti - during the formation of the paper web.

[0012] Further, there the step of using the security strip made with additional visual and/or computer-readable security elements.

[0013] A safety paper is produced by said method.

[0014] The problem posed is solved also by a method for producing a safety paper, comprising the steps of: forming a first paper web with a security strip having a width of more that 2 mm and being embedded into said paper web during the molding thereof on a wire-mesh cylinder, wherein the safety strip is introduced into a pulp in such a way that, prior to contact thereof with the cylinder, a fibrous layer is molded, except for areas on a cylinder surface where the layer is not formed for lack of filtering property; and positioning the thread on the cylinder in such a way that a part of the surface thereof coincides with cylinder elements where the layer is not formed, and free access zones are formed as windows on a paper wire side, wherein a second paper web is formed simultaneously with the formation of the first paper web with the security strip, and said webs are connected in such a way that the second paper web is superposed to a side of the first paper web opposite to a wire side, wherein the security strip is completely or partially exposed from the first paper web side opposite to the wire side while the second paper web is made with continuous or periodical gaps having predetermined positions over the web and predetermined shapes and sizes, wherein the paper webs are connected in such a way that the gaps in the second web are coincident with outs of the thread of the first web to form through windows being zones for free accessing the thread simultaneously from two sides of paper.

[0015] In this method, the step of forming the first paper web comprises the step of creating areas devoid of filtering property on the cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

[0016] In this method, the step of forming the second paper web comprises the step of creating areas devoid of filtering property on the cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

[0017] The gaps on the second paper web are made after removal of this paper web from the molding cylinder and prior to connection thereof to the first paper web.

[0018] There is the step of using the security strip made with additional visual and/or computer-readable security elements.

[0019] There is the step of using the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film.

[0020] There is the step of introducing an additional security element - watermarks and/or security fibers and/or confetti - during the formation of the paper web.

[0021] There is use of the security strip made with additional visual and/or computer-readable security elements.

[0022] A safety paper is produced by said method.

[0023] The problem posed is solved also by a method for producing a safety paper, as disclosed below, comprising the steps of: forming a first paper web and a second paper web on wire-mesh cylinders; and making paper with a security strip having a width of more that 2 mm and being embedded into the paper web, wherein the first and second paper webs are made with continuous or periodical gaps having predetermined positions over the web and predetermined shapes and sizes, wherein the security strip is introduced between two webs at a location of their connection in such a way that the security strip coincides with an arrangement of gaps of both webs, and through windows being zones for free accessing the security thread from both sides of paper simultaneously are formed at locations where the gaps in the first and second webs are coincident.

[0024] In order to make the gaps in formation of the fist paper web, there is the step of creating areas devoid of filtering property on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

[0025] In order to make the gaps in formation of the second paper web, there is the step of creating areas devoid of filtering property on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

[0026] The gaps on the second paper web are made after removal of this paper web from the molding cylinder and prior to connection thereof to the first paper web.

[0027] There is the step of using the security strip having predetermined water permeability value over a surface area.

[0028] There is the step of using the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film.

[0029] There is the step of introducing an additional security element - watermarks and/or security fibers and/or confetti - during the formation of the paper web.

[0030] There is the step of using the security strip made with additional visual and/or computer-readable security elements.

[0031] A safety paper is produced according to the present method as well.

[0032] Apart from the methods listed above, the problem posed is also solved by a method for producing a safety paper, comprising the steps of: forming a first paper web with a security strip of more than 2 mm in width; embedding said strip into this web during the molding thereof on a wire-mesh cylinder, wherein simultaneously with the step of forming the first paper web with the security strip, there is the step of forming a second paper web and connecting the webs in such a way that the second paper web is superposed to a side of the first paper web opposite to a wire side, wherein a ridge is made on a surface of a wire-mesh cylinder by stamping a wire mesh, the security strip is laid onto the ridge prior to contact of the wire mesh with a paper pulp, and free access zones are formed at a location where the security strip contacts the ridge, wherein the ridge is made with figured edges of a predetermined shape while the opposite side of the security strip is left exposed, and the second paper web is made with continuous or periodical gaps having predetermined positions over the web and predetermined shapes and sizes, wherein the paper webs are connected in such a way that the gaps in the second web are coincident with outs of the thread of the first web to form through windows being zones for free accessing the thread simultaneously from two sides of paper.

[0033] In order to make the gaps in formation of the second paper web, there is the step of creating areas devoid of filtering property on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

[0034] The gaps on the second paper web are made after removal of this paper web from the molding cylinder and prior to connection thereof to the first paper web.

[0035] There is the step of using the security strip having predetermined water permeability value over a surface area.

[0036] There is also the step of using the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film.

[0037] There is the step of introducing an additional security element - watermarks and/or security fibers and/or confetti - during the formation of the paper web.

[0038] Further, there is the step of using of the security strip made with additional visual and/or computer-readable security elements.

[0039] A safety paper is produced by the present method.

Brief Description of the Drawings

[0040] The invention is explained by graphic materials.

Fig. 1 is a diagram that shows introduction of a security strip in operation with one molding cylinder (a first embodiment).

Fig. 2 shows paper with a security element having water-permeable edges.

Fig. 3 is a cross-section A-A of Fig. 2.

Fig. 4 is a cross-section B-B of Fig. 2.

Fig. 5 shows paper with a security element water-permeable throughout its surface.

Fig. 6 is a cross-section C-C of Fig. 5.

Fig. 7 is a cross-section D-D of Fig. 5.

Figs. 8, 9 show a cross-section E-E of Fig. 1 in different embodiments.

Fig. 10 is a diagram that shows introduction of a security strip in operation with two molding cylinders (a second embodiment).

Fig. 11 is a diagram that shows introduction of a security strip between two webs (a third embodiment).

Fig. 12 is a diagram that shows introduction of a security strip onto a ridge (a fourth embodiment).

Figs. 13, 14 show different embodiments of a cross-section F-F of Fig. 12.

Fig. 15 is a view A of Fig. 14 (an embodiment of the ridge).

The Best Mode of the Invention

[0041] The method for producing a safety paper is carried out as follows.

[0042] According to the first embodiment (Fig. 1) of the method for producing a safety paper, the method includes forming a paper web 1 with a security strip (thread) 2 having a width of more than 2 mm and being embedded into the web 1 during the molding thereof on a wire-mesh cylinder 3. The safety strip is introduced into a paper pulp 4 in such a way that, prior to contact thereof with the wire-mesh cylinder 3, a fibrous layer 5 is molded, except for areas on a surface of the cylinder 3 where the layer 5 is not formed for lack of filtering property. When the thread is introduced, it is positioned on the cylinder 3 in such a way that a part of the surface thereof coincides with cylinder elements 6 where the layer is not formed, and free access zones are formed as windows on a paper wire side.

[0043] The elements 6 devoid of filtering property are made on the surface of the cylinder 3 by covering the wire mesh with a filigree or by pouring the wire mesh with a waterproof material, for example a polymer, or by making through holes in the wire mesh. In realization of the present embodiment of the method, the completely or partially exposed security strip is produced on a side opposite to a wire side, and through windows 7 are formed at locations where the windows on the wire side and the complete or partial outs of the security strip on the opposite side of paper coincide.

[0044] The security strip having predetermined water permeability value over a surface area is used in production of paper. The security strip can be made of a polymeric mesh or a non-woven material or a polymeric perforated film. A central portion of the strip can be made water-impermeable wile side edges can be made water-permeable.

[0045] Fig. 2 shows the paper web 1 with the introduced security strip 2 made in the form of a water-permeable substrate 8 with a central water-impermeable portion 9 that can be made by depositing a polymer onto a mesh substrate, or the water impermeability of the central portion can be obtained by melting substrate fibers subjected to pressure and temperature in case of using a non-woven material. It is possible to provide the central portion with different shapes and sizes in order to obtain different shapes of the through windows 7.

[0046] Figs. 3 and 4 show cross-section A-A in a zone of a window and cross-section B-B between windows (according to Fig. 2), respectively.

[0047] Fig. 5 shows the paper web 1 with the introduced security strip 2 having the through windows 7 and being made as a water-permeable substrate 8 that is a lavsan film perforated throughout its width, a polymeric mesh or a non-woven material. The strip is free of paper fibers from two sides in a zone where the window 7 is formed (see Fig. 6 that is cross-section C-C of Fig. 5) and is covered by paper fiber layers on both sides in a zone between the windows 7 (see Fig. 7 that is cross-section D-D of Fig. 5).

[0048] Figs. 8 shows an embodiment of cross-section E-E of Fig. 1, where the element 6 is made as a water-impermeable element fastened on the surface of the wire-mesh cylinder 3 and preventing deposition of the paper pulp 4.

[0049] Figs. 9 shows an embodiment of the element 6 as a through hole 10 in the wire-mesh cylinder 3 with a filigree ending 11 designed to avoid deposition of fibers on uneven wire-mesh edges

[0050] The holes 10 may be of arbitrary shapes and lengths. The difference between the holes is in that a hole is a zone where the pulp flow through the hole is unimpeded, without formation of a paper layer at this location, in the case with a water-impermeable element where a zone devoid of filtering property is created. "Through windows" are created in operation with a completely or partially water-impermeable element. For example, a strip element having water - impermeable edges and a water-impermeable central portion may be used. When such a strip element will contact the wire-mesh cylinder where holes are present and have a width being less than or the same as that of the water-impermeable portion of the strip element, deposition on a side opposite to the wire side will take place only where the surface has water permeability. At locations where holes were present, "through windows" are formed; if there was the case that the strip element had water permeability throughout its area, then the entire side opposite to the wire side would be covered by the paper layer at the location where the strip element lies.

[0051] An additional security element - watermarks and/or security fibers and/or confetti - is introduced during the formation of the paper web. This security element can comprise confetti and/or fibers of various shapes and chemical compositions within or on the surface of the paper web, including the confetti and/or fibers coated with or composed of materials with luminescent and/or magnetic properties and/or X-radiation absorbing materials, pigments with various optical effects such as pigments with an interference layer, liquid crystal pigments, and pigments with metallic effects.

[0052] The security strip is also produced with additional security elements, for example, on the basis of holographic images, including topographic images with hidden marks, that is, being observed using special devices as well as due to materials having magnetic and/or electro-conductive and/or luminescent properties, including materials having the luminescence when excited by ultraviolet, infrared and X-rays.

[0053] According to the second embodiment (Fig. 10) of the method for producing a safety paper, this method includes forming a paper web 1 with a security strip (thread) 2 having a width of more than 2 mm and being embedded into the web 1 during the molding thereof on a wire-mesh cylinder 3. The safety strip is introduced into a paper pulp 4 in such a way that, prior to contact thereof with the wire-mesh cylinder 3, a fibrous layer 5 is molded, except for areas on a surface of the cylinder 3 where the layer 5 is not formed for lack of filtering property. When being introduced, the security strip 2 is positioned on the cylinder 3 in such a way that a part of the surface thereof coincides with cylinder elements 6 where the layer is not formed, and free access zones are formed as windows on a paper wire side.

[0054] The elements 6 devoid of filtering property are made on the surface of the cylinder 3 by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material, for example, a polymer, or by making through holes in the wire mesh (as in the first embodiment of the method). In realization of the present embodiment of the method, the completely or partially exposed security strip is produced on a side opposite to the wire side.

[0055] A second paper web 12 is formed on a wire-mesh cylinder 13 simultaneously with the formation of the first paper web 1 with the security strip 2, and said webs are connected in such a way that the second paper web 12 is superposed to a side of the first paper web 1 opposite to the wire side.

[0056] The second paper web 12 is made with continuous or periodical gaps 14 having predetermined positions over the web and predetermined shapes and sizes, wherein the paper webs are connected in such a way that the gaps 14 in the second web are coincident with outs of the thread of the first web to form through windows being zones for free accessing the thread simultaneously from two sides of paper.

[0057] Elements 15 devoid of filtering property are made on the surface of the cylinder 13 by covering the wire mesh with a filigree or by pouring the wire mesh with a waterproof material, for example a polymer, or by making through holes in the wire mesh.

[0058] The gaps 14 on the second paper web 12 can be also made after removal of this paper web from the wire-mesh cylinder 13 and prior to connection thereof to the first paper web 1. The gaps 14 can be made, for example, by local subjecting the paper web to an air of water jet.

[0059] The security strip having a predetermined water permeability value over a surface area is used during the production of paper. The security strip can be made of a polymeric mesh or a non-woven material or a polymeric perforated film. A central portion of the strip can be made water-impermeable while side edges can be made water-permeable (Figs. 2 to 7).

[0060] An additional security element - watermarks and/or security fibers and/or confetti - is introduced during the formation of the paper web. This security element may comprise confetti and/or fibers of various shapes and chemical compositions within or on the surface of the paper web, including the confetti and/or fibers coated with or composed of materials with luminescent and/or magnetic properties and/or X-radiation absorbing materials, pigments with various optical effects such as pigments with an interference layer, liquid crystal pigments, and pigments with metallic effects.

[0061] An additional security elements, for example, on the basis of holographic images, including topographic images with hidden marks, that is, being observed using special devices as well as due to materials having magnetic and/or electro-conductive and/or luminescent properties, including materials having the luminescence when excited by ultraviolet, infrared and X-rays.

[0062] According to the third embodiment (Fig. 11) of the method for producing a safety paper, this method comprises forming first and second paper webs 1 and 2 on wire-mesh cylinders 3 and 13. The first and second paper webs 1 and 2 are made with continuous or periodical gaps having predetermined positions over the web and predetermined shapes and sizes, wherein the security strip 2 of more that 2 mm in width is introduced between the webs 1 and 12 at a location of their connection in such a way that the security strip 2 coincides with an arrangement of gaps of both webs, and through windows are formed as zones for free accessing the security strip simultaneously from both sides of paper at locations where the gaps are coincident in the first and second webs. In order to make the gaps during the formation of the fist paper web, areas devoid of filtering property are created on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

[0063] In order to make the gaps in formation of the second paper web, areas devoid of filtering property are created on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

[0064] In Fig. 11, the element 6 is made in the form of holes in the wire mesh of the cylinder 3 while the element 15 is made in the form of a filigree paper positioned over the entire circumference of the wire-mesh cylinder 13 in order to obtain a continuous gap over the surface of the paper web.

[0065] The security strip having a predetermined water permeability value over a surface area and being made, for example, of a polymeric mesh or a non-woven material or a polymeric perforated film is used.

[0066] An additional security element - watermarks and/or security fibers and/or confetti - is introduced during the formation of the paper web. This security element can comprise confetti and/or fibers of various shapes and chemical compositions within or on the surface of the paper web, including the confetti and/or fibers coated with or composed of materials with luminescent and/or magnetic properties and/or X-radiation absorbing materials, pigments with various optical effects such as pigments with an interference layer, liquid crystal pigments, and pigments with metallic effects.

[0067] The security strip is also produced with additional security elements, for example, on the basis of holographic images, including topographic images with hidden marks, that is, being observed using special devices as well as due to materials having magnetic and/or electro-conductive and/or luminescent properties, including materials having the luminescence when excited by ultraviolet, infrared and X-rays.

[0068] According to the fourth embodiment (Fig. 12) of the method for producing a safety paper, this method includes forming a first paper web with a security strip 2 having a width of more than 2 mm and being embedded into the web 1 during the molding thereof on a wire-mesh cylinder 3. Simultaneously with the step of forming the first paper web with the security strip 2, a second paper web 12 on a wire-mesh cylinder 13 is formed, and said webs are connected in such a way that the second paper web 12 is superposed to a side of the first paper web 1 opposite to the wire side. A ridge 16 is made on a surface of the wire-mesh cylinder 3 (see cross-section F-F of Fig. 12 in Fig. 13, and Fig. 14) by stamping the wire mesh, the security strip 2 is laid onto the ridge 16 prior to contact of the wire mesh with a paper pulp, and free access zones are formed at a location where the security strip 2 contact the ridge 16. The ridge 16 is made with figured edges 17 of a predetermined shape (Fig. 15). An opposite side of the security strip is left exposed, wherein the second paper web is made with continuous or periodical gaps having predetermined positions over the web and predetermined shapes and sizes. The paper webs are connected in such a way that the gaps in the second web are coincident with outs of the thread of the first web to form through windows being zones for free accessing the thread simultaneously from two sides of paper.

[0069] In order to make the gaps in formation of the fist paper web, areas devoid of filtering property are created on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

[0070] The gaps on the second paper web are made after removal of this paper web from the molding cylinder and prior to connection thereof to the first paper web.

[0071] The security strip having predetermined water permeability value over a surface area, for example, the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film is used.

[0072] An additional security element - watermarks and/or security fibers and/or confetti - is introduced during the formation of the paper web.

[0073] The security strip made with additional visual and/or computer-readable security elements is used.

Industrial Applicability

[0074] The inventive methods for producing a safety paper allow production of paper with a strip-type security element having through windows. Use of such a paper in the production of fraud-proof printing goods provides the reliable protection of valuable papers against falsification because the through windows represent an element hard to be falsified; further, by using additional security features, including that on the strip element, it is possible to obtain diverse visual and computer-readable security features. The inventive methods are practically feasible, and their diversity allows selection of an embodiment of the method for producing a safety paper optimal for each particular production.

Claims

1. A method for producing a safety paper comprising the steps of: forming a paper web with a security strip having a width of more that 2 mm and being embedded into this web during the molding thereof on a wire-mesh cylinder, wherein the safety strip is introduced into a pulp in such a way that, prior to contact thereof with the cylinder, a fibrous layer is molded, except for areas on a cylinder surface where the layer is not formed for lack of filtering property; and positioning the thread on the cylinder in such a way that a part of the surface thereof coincides with cylinder elements where the layer is not formed, and free access zones are formed as windows on a paper wire side, the method being characterized by creating areas devoid of filtering property on the cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh, wherein the thread is completely or partially exposed at a side opposite to a wire side, and through windows are formed at locations where the windows on the wire side and the complete or partial outs of the security strip on the opposite side of paper coincide.

2. The method according to claim 1, characterized by using the security strip having predetermined water permeability value over a surface area.

3. The method according to claim 2, characterized by using the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film.

4. The method according to claim 1, characterized by introducing an additional security element - watermarks and/or security fibers and/or confetti - during the formation of the paper web.

5. The method according to claim 1, characterized by using the security strip made with additional visual and/or computer-readable security elements.

6. A safety paper characterized in that it is produced by the method according to any one of claims 1 to 5.

7. A method for producing a safety paper, comprising the steps of: forming a first paper web with a security strip having a width of more that 2 mm and being embedded into said paper web during the molding thereof on a wire-mesh cylinder, wherein the safety strip is introduced into a pulp in such a way that, prior to contact thereof with the cylinder, a fibrous layer is molded, except for areas on a cylinder surface where the layer is not formed for lack of filtering property; and positioning the thread on the cylinder in such a way that a part of the surface thereof coincides with cylinder elements where the layer is not formed, and free access zones are formed as windows are formed on a paper wire side, wherein a second paper web is formed simultaneously with the formation of the first paper web with the security strip, and said paper webs are connected in such a way that the second paper web is superposed to a side of the first paper web opposite to a wire side, the method being characterized by completely or partially exposing the security strip from the first paper web side opposite to the wire side and making the second paper web with continuous or periodical gaps having predetermined positions over said web and predetermined shapes and sizes, wherein the paper webs are connected in such a way that the gaps in the second web are coincident with outs of the thread of the first web to form through windows being zones for free accessing the thread simultaneously from two sides of paper.

8. The method according to claim 7, characterized in that the step of forming the first paper web comprises the step of creating areas devoid of filtering property on the cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

9. The method according to claim 7, characterized in that the step of forming the second paper web comprises the step of creating areas devoid of filtering property on the cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

10. The method according to claim 7, characterized by making the gaps on the second paper web after removal of this paper web from the molding cylinder and prior to connection thereof to the first paper web.

11. The method according to claim 7, characterized by using the security strip having predetermined water permeability value over a surface area.

12. The method according to claim 11, characterized by using the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film.

13. The method according to claim 7, characterized by introducing an additional security element - watermarks and/or security fibers and/or confetti - during the formation of the paper web.

14. The method according to claim 7, characterized by using the security strip made with additional visual and/or computer-readable security elements.

15. A safety paper characterized in that it is produced by the method according to any one of claims 7 to 14.

16. A method for producing a safety paper, comprising the steps of: forming a first paper web and a second paper web on wire-mesh cylinders; and making the paper with a security strip having a width of more that 2 mm and being embedded into the paper web, the method being characterized by making the first and second paper webs with continuous or periodical gaps having predetermined positions over the web and predetermined shapes and sizes, wherein the security strip is introduced between the two paper webs at a location of their connection in such a way that the security strip coincides with an arrangement of gaps of both webs, and through windows being zones for free accessing the security thread from both sides of paper simultaneously are formed at locations where the gaps in the first and second webs are coincident.

17. The method according to claim 16, characterized in that, in order to make the gaps in formation of the fist paper web, it comprises the step of creating areas devoid of filtering property on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

18. The method according to claim 16, characterized in that, in order to make the gaps in formation of the second paper web, it comprises the step of creating areas devoid of filtering property on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

19. The method according to claim 16, characterized by making the gaps on the second paper web after removal of this paper web from the molding cylinder and prior to connection thereof to the first paper web.

20. The method according to claim 16, characterized by using the security strip having predetermined water permeability value over a surface area.

21. The method according to claim 20, characterized by using the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film.

22. The method according to claim 16, characterized by introducing an additional security element - watermarks and/or security fibers and/or confetti - during the formation of the paper web.

23. The method according to claim 16, characterized by using the security strip made with additional visual and/or computer-readable security elements.

24. A safety paper characterized in that it is produced by the method according to any one of claims 16 to 23.

25. A method for producing a safety paper, comprising the steps of: forming a first paper web with a security strip having a width of more that 2 mm and being embedded into the paper web, forming a second paper web simultaneously with the step of forming the first paper web with the security strip, and connecting the paper webs in such a way that the second paper web is superposed to a side of the first paper web opposite to a wire side, the method being characterized by: making a ridge on a surface of a wire-mesh cylinder by stamping a wire mesh; laying the security strip onto the ridge prior to contact of the wire mesh with a paper pulp, and forming free access zones at a location where the security strip contacts the ridge, wherein the ridge is made with figured edges of a predetermined shape while the opposite side of the security strip is left exposed, wherein the second paper web is made with continuous or periodical gaps having predetermined positions over the web and predetermined shapes and sizes, wherein the paper webs are connected in such a way that the gaps in the second paper web are coincident with outs of the thread of the first paper web to form through windows being zones for free accessing the thread simultaneously from two sides of paper.

26. The method according to claim 25, characterized in that, in order to make the gaps in formation of the second paper web, it comprises the step of creating areas devoid of filtering property on a cylinder surface by covering the wire mesh with a filigree paper or by pouring the wire mesh with a waterproof material or by making through holes in the wire mesh.

27. The method according to claim 25, characterized by making the gaps on the second paper web after removal of this paper web from the molding cylinder and prior to connection thereof to the first paper web.

28. The method according to claim 25, characterized by using the security strip having predetermined water permeability value over a surface area.

29. The method according to claim 28, characterized by using the security strip of a polymeric mesh or a non-woven material or a polymeric perforated film.

30. The method according to claim 25, characterized by introducing an additional security element - watermarks and/or security fibers and/or confetti - during the formation of the paper web.

31. The method according to claim 25, characterized by using the security strip made with additional visual and/or computer-readable security elements.

32. A safety paper characterized in that it is produced by the method according to any one of claims 25 to 31.

Drawing