JP6323807B2 - Anti-counterfeit paper and method for producing the same - Google Patents

Description

  The present invention relates to a sheet used for valuable printed matter such as banknotes, securities, passports, etc., which requires prevention of counterfeiting, and a method for manufacturing the same.

With recent advances in copying technology using color copying, color scanners, and the like, there is an increased risk that counterfeit printed materials such as banknotes, securities, and passports will be forged. As a countermeasure, there is a method of making a special fiber such as a colored fiber or a fluorescent fiber or a thread into a paper in a paper making process which is a manufacturing stage of a printing paper used for precious printed matter.

  For example, as a method for making a special fiber into paper, in Patent Document 1, the special fiber is contained above the boundary between the stock liquid surface in the circular net tank of the circular net paper machine and the circular net. After installing the nozzle for pouring the stock, the special fiber formed by adding the special fiber on the surface of the wet paper formed by the circular net by pouring the stock containing the special fiber from the nozzle. A method for manufacturing the applied paper is disclosed. In addition, after pouring special fibers on the surface of wet paper, it is possible to add special fibers in the paper layer of multilayer paper by overlaying wet paper from the attached circular or long mesh on it. It becomes.

  Further, as a method of making a thread into a single-layer paper, in Patent Document 2, when a single-layer paper layer is formed by a long paper machine or a circular paper machine, amplitude driving is performed in the width direction of the net. A method of manufacturing a paper in which a thread is provided in a single paper layer by inserting the thread through a possible insertion tube is disclosed. In the paper of Patent Document 2, the length of the part where the thread and the paper layer are separated, which is generated by inserting the thread while being driven in the width direction, is the unique information, and the authenticity of the paper can be determined based on the unique information. It is said.

Japanese Examined Patent Publication No. 6-63200 Japanese Patent No. 3766850

  According to the method of Patent Document 1, special fibers can be provided in the paper. However, since it is given by pouring a stock containing special fibers on the wet paper in the paper making process, it can only be formed on the surface for single-layer paper, and when it is given inside the paper Cannot be formed unless the wet paper is made on a single-layer wet paper provided with special fibers on the surface. Therefore, in the case of a single layer, the special fiber may be peeled off from the surface and may be tampered with.

Further, the position where the special fiber is applied to the paper is limited to a part of the paper in the width direction where the nozzle for pouring the special fiber is movable. In addition to counterfeiting using the above-described color copy, color scanner, etc., the precious printed matter also has a problem of counterfeiting by cutting and pasting one genuine product to produce a plurality of counterfeit products. As in Patent Document 1, in a configuration in which special fibers can be applied only to some limited positions, a portion where the special fibers that are the majority of the paper are not applied is cut and pasted to produce a plurality of counterfeit products. Counterfeiting may occur.

Furthermore, in the case of applying to the inside of the paper using the method of Patent Document 1, since it is necessary to use a multilayer paper, the layers cannot be sufficiently fixed only by the interfiber bonding, and delamination may occur. There is sex. Furthermore, since the papermaking process and the pretreatment process such as the paper material adjustment accompanying it use two circular net tanks, there is a problem that a plurality of processes are required.

  Further, according to the method of Patent Document 2, it is possible to add a thread inside the paper layer of a single-layer paper. However, since the length of the part where the thread and the paper layer are separated is used as the unique information, and the authenticity of the paper is determined based on the unique information, the delamination occurs from the separated part even though it is a single-layer paper. There is a problem that it occurs.

  The present invention aims to solve the above-described problems. Specifically, forgery is a forgery in which a functional material having excellent fixability is provided at a position desired by a user inside a paper layer of a single-layer paper. An object of the present invention is to provide a sheet having a prevention effect and a method for manufacturing the sheet.

  The anti-counterfeit paper of the present invention has a pattern formed in a part of the paper layer of the single-layer paper at the same depth from the surface of the paper, and the pattern is a functional group that can be chemically bonded to the paper layer. And / or an anti-counterfeit paper comprising at least one functional material having a width greater than a three-dimensional network formed by a paper layer formed of fibers and / or fibers.

In addition, the method for producing the anti-counterfeit paper of the present invention is a method of manufacturing a paper provided with a functional material using a paper machine, and the functional material has a functional group capable of chemically bonding with wet paper. The material has a width larger than the three-dimensional network formed by the paper layer formed of the material and / or fiber, and the flow rate of the nozzle that injects a dispersion liquid in which a plurality of functional materials are dispersed is adjusted on the wire portion of the paper machine. A step of adjusting the moisture content of the wet paper on the wire portion, and a step of adjusting the jet flow rate for the wet paper after the moisture content adjustment step in order to impart a functional material to the inside of the single layer wet paper. And a step of applying a functional dispersion liquid from a later nozzle.

Furthermore, the moisture content adjusting step of the present invention is characterized in that the moisture content of the wet paper is adjusted to 80 to 97%.

  A plurality of functional materials having functional groups capable of chemically bonding to the paper layer and / or having a width larger than the three-dimensional network by the paper layer formed of fibers are all formed from the surface of the paper inside the single-layer paper. By forming a pattern formed by giving the same depth, the appearance is a paper having a functional material inside the paper, like a multilayer paper, but in fact it is formed of a single layer, Compared with the case where it is applied to the multilayer paper, delamination does not occur, and the anti-counterfeit paper is excellent in fixability between the paper layer and the functional material.

In addition, by applying a functional material dispersion liquid in which a functional material is dispersed from a nozzle with an adjusted jet flow rate to a single layer wet paper with a controlled moisture content on the wire part in a paper machine, Produce anti-counterfeit paper with functional material added inside the paper. Therefore, the merit that the paper making process and the pretreatment process such as paper material adjustment accompanying the paper making process are reduced by half as compared with the conventional multilayer paper manufacturing process has been born.

Furthermore, functional material can be applied to the position desired by the user with respect to the paper without being limited to the width direction of the wet paper, by applying the functional material not by pouring but by nozzle injection with an adjusted injection flow rate. It became. Therefore, compared to the configuration in which the functional material is applied only to some limited positions, it can be applied to the whole, so that forgery by cutting and pasting becomes extremely difficult. Further, when forgery is performed by cutting and pasting, since the functional material is not provided at a position desired by the user, it is possible to easily determine forgery.

The top view which shows the forgery prevention paper (1) in this invention. The Y-Y 'cross section figure of the forgery prevention paper (1) in this invention. The top view which shows the shape which provides the pattern (2) in this invention. Sectional drawing which shows the forgery prevention paper (1 ') in this invention. The Y-Y 'cross section figure of the forgery prevention paper (1') in this invention. 6 is a flowchart illustrating a method for manufacturing a forgery-preventing paper according to the present invention. The schematic diagram which shows the paper machine which manufactures the forgery prevention paper of this invention. The schematic diagram which shows each process in the manufacturing method of the forgery prevention paper of this invention. The enlarged view of the area | region (Z) of the forgery prevention paper (1 ') in this invention.

  The present invention is not limited to the embodiments for carrying out the invention described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

FIG. 1 is a plan view of an anti-counterfeit paper (1) according to the present invention. The area (Z) of the anti-counterfeit paper (1) cannot be seen from the surface under reflected light as shown in FIG. 1 (a), but transmitted light as shown in FIG. 1 (b). A belt-like pattern (2) that can be seen below is provided.

2 is a cross-sectional view of the anti-counterfeit paper (1) taken along the line Y-Y 'in FIG. The anti-counterfeit paper (1) is a pattern in which a part of the paper layer (Q) in a single-layer paper made of fibers is given to the same depth from the surface (F) of the anti-counterfeit paper (1) ( 2). The pattern (2) is formed of a plurality of functional materials (3) as shown in the enlarged view.

  The fibers forming the paper are not particularly limited, such as chemical pulps such as KP and SP made from plant fibers such as wood and non-wood, mechanical pulps such as GP, TMP, and CTMP, recycled paper recycled pulp, etc. Pulp can be appropriately selected and used, but paper made of wood or non-wood fibers, and synthetic fiber paper made of synthetic fibers having a functional group capable of forming hydrogen bonds are preferred.

As will be described in detail later, the pattern (2) is obtained by dispersing a plurality of functional materials (3) in water and then dispersing the dispersion (hereinafter referred to as “functional dispersion”) on a paper machine. By spraying on the paper, it is applied in the paper layer (Q) of the paper. Therefore, by forming the paper with natural fibers such as wood fibers and non-wood fibers or synthetic fibers having a functional group capable of forming hydrogen bonds, the functional material (3) dispersed in water is formed by paper by hydrogen bonding. It is possible to firmly fix in the layer (Q).

Even if it is a synthetic fiber paper made of synthetic fibers that do not have a functional group capable of forming hydrogen bonds, or paper containing plastic fibers or glass fibers that do not form hydrogen bonds, a small amount of binder component is added to the functional dispersion. If the functional material (3) can be fixed in the paper layer (Q), it can be used.

Further, it is preferable that the paper has a light transmitting property, so-called light transmittance, so that the pattern (2) provided in the paper layer (Q) can be observed under transmitted light. In FIG. 1, the paper layer (Q) has been described as a light-transmitting material, but it is also possible to use a material that does not have a light-transmitting property.

When the paper is a material that does not transmit light and the functional material (3) is a machine-readable material such as magnetism or infrared absorbing material, the functional material (3) Although the presence cannot be confirmed, it becomes possible to discriminate the functional material (3) given in the single-layer paper layer (Q) by machine reading, and secondary authentication can be given to the paper. It becomes possible. Hereinafter, in the present invention, it is assumed that the paper layer (Q) is made of a material capable of forming a paper having optical transparency.

In the present invention, the term “single layer” refers to a layer of paper formed by either one of a long mesh portion or a circular mesh portion in a paper machine.

Next, the functional material (3) will be described. The functional material (3) is a material that can be visually and / or machine-readed and given to a part of the paper layer (Q) in the single-layer paper.

Functional materials (3) include functional fibers such as colored fibers, fluorescent fibers, polymer fibers, metal fibers, nanofibers, thermofibers, carbon, titanium oxide, colored pigments, mica (pearl pigments), colored fluorescent pigments There are functional pigments such as colorless fluorescent pigments, functional dyes that are colored dyes, functional powders such as metal powders, metal pieces, metal foils, and vapor-deposited thin films.

The pattern (2) is formed by arranging a plurality of at least one kind of functional material (3). The fact that a plurality of at least one kind of functional material (3) are arranged means, for example, that there are one colored fiber and a plurality of fluorescent fibers. Moreover, having a plurality of one type of functional material (3) means having a plurality of nanofibers.

All of the plurality of functional materials (3) forming the pattern (2) are all provided at the same depth (h1) from the surface (F) of the paper in the paper layer (Q).

  The same depth (h1) in the present invention means that the depth (h1), which is the distance from the surface (F) to the functional material (3), is from one surface (F) to the functional material (3). When the depth (h1), which is the distance of, is used as a reference value, it means that all of the plurality of functional materials (3) are provided within a range of ± 20% of the reference value. When all of the plurality of functional materials (3) are applied within a range of ± 20% of the reference value, a plurality of functional materials (3) are parallel to the surface (F) when observed with the naked eye as a cross section of the paper. It is visually recognized that all of the functional material (3) is applied.

Conventionally, when a plurality of functional materials (3) are applied to the same depth from the surface of the paper, the functional material is previously applied to the intermediate layer of the multilayer paper by printing, impregnation, etc. As in Document 1, after a paper material mixed with special fibers was poured onto a single layer wet paper, a paper layer (Q) was further formed thereon.

Therefore, in any method, it is essential to combine in multiple layers. For example, when used as paper for valuable printed matter such as banknotes, securities, passports, the layers are peeled off, and the functional material in the multilayer paper There was a problem that (3) was falsified. Also, in manufacturing, it is necessary to form a large number of paper layers (Q) and then combine them as a single sheet. Therefore, a plurality of pre-processing steps such as a paper making step and a paper material adjustment associated therewith are required. There was a problem.

Therefore, in the anti-counterfeit paper (1) of the present invention, a pattern (2) made of a plurality of functional materials (3) is formed in a part of the paper layer (Q) of the single-layer paper. By making it a single layer, the layers do not peel off, and if it is attempted to tamper with the internal functional material (3), the paper layer (Q) will break, making it difficult to forge It becomes.

Further, the anti-counterfeit paper (1) of the present invention will be described in detail later, but a functional dispersion liquid in which a functional material is dispersed after adjusting the amount of water is applied to a single-layer wet paper in the paper manufacturing stage. By applying by nozzle injection, all of the plurality of functional materials (3) forming the pattern (2) in the single paper layer (Q) are all the same depth from the paper surface (F) ( The configuration given in h1) is adopted.

Therefore, also in production, it becomes possible to apply the functional material (3) in one long net part or circular net part on the paper machine, rather than the conventional application method of the functional material (3), The papermaking process is reduced, and it is possible to manufacture with less manufacturing equipment.

The effect when the functional material (3) provided in the paper layer (Q) is put is as follows. For example, when the functional material (3) is a material that is visible under a visible light source, such as a colored fiber, a colored pigment, or a colored fiber, a line-shaped colored pattern that is visible with the naked eye can be provided. .

  In FIG. 1, the case has been described where the pattern (2) is visible as a band-like shape under transmitted light. However, if the pattern (2) is provided as meaningful information in a single paper layer (Q). The shape of the pattern (2) is not particularly limited. FIG. 3 is a plan view showing another shape to which the functional material (3) is applied. As shown in FIG. 3A, the functional material (3) may be formed as a plurality of strips. Moreover, it is good also as a pattern shape as shown in FIG.3 (b), or a character shape as shown in FIG.3 (c).

  In FIG. 1, the pattern (2) is formed on a part of the anti-counterfeit paper (1). However, as shown in FIGS. 3 (d) and 3 (e), the anti-counterfeit paper (1) It is also possible to form the pattern (2) on the entire surface.

Conventionally, when the functional material (3) is applied, as in Patent Document 1 described above, special fibers are poured into the paper. Therefore, it could only be applied in a strip shape in the width direction (R) perpendicular to the paper making direction (V) when the paper shown in FIG. However, although details of the manufacturing method will be described later, the anti-counterfeit paper (1) of the present invention is applied not only in the width direction (R) but also in FIG. The anti-counterfeit paper (1) shown in FIG. 3 or the spiral shape shown in FIG. 3 (e) can be applied in the direction and position desired by the user.

When the anti-counterfeit paper (1) shown in FIG. 3 (e) is forged by cutting and pasting, as shown in FIG. 3 (f), the anti-counterfeit paper (1) is positioned at a position desired by the user on the plane. Since the functional material (2) is not provided, it is possible to easily perform authenticity determination. Further, although not shown, even when the cross section is viewed, all of the plurality of functional materials (3) are all at the same depth (h1) from the surface (F) of the paper due to breakage of the paper due to cutting and pasting. Since it is no longer the assigned configuration, it is possible to perform authenticity determination.

In addition, the functional material (3) forming the pattern (2) is not limited to this, and may be a material that is visible in a predetermined environment such as a fluorescent fiber, a fluorescent pigment, an infrared absorbing pigment, and a thermo fiber. Is possible. When the material is visible under a predetermined environment, the pattern (2) is visible under predetermined conditions (eg, ultraviolet irradiation, visual recognition with an infrared camera, etc.) where the pattern is visible.

Furthermore, when polymer fibers are used, the effect of changing the reflected light depending on the observation angle, and when the density is increased, the transparency is increased and the whitening effect is obtained. In addition, in the case of a material with low light transmissivity, such as a vapor deposition thin film or metal foil, the effect of polarizing the iris color is obtained under reflected light, and the black light effect is obtained by concealing the transmitted light with the transmitted light. It becomes possible.

The functional material (3) of the present invention must have a functional group capable of chemically bonding with the paper layer (Q) and / or have a width larger than the three-dimensional network formed by the paper layer (Q) formed of fibers. There is.

  First, the necessity that the functional material (3) has a functional group capable of chemically bonding with the paper layer (Q) will be described. As described above, the paper layer (Q) has a sheet shape in which fibers are bonded by hydrogen bonding between the fibers. Therefore, the functional material (3) has a functional group capable of hydrogen bonding, which is one of chemical bonds with the paper layer (Q), so that the functional layer (3) is hydrogen bonded to the fiber of the paper layer (Q), and the paper layer ( This is because the yield is within Q).

As long as the functional material (3) having a functional group capable of hydrogen bonding with the paper layer (Q) is a material having a hydroxyl group, rayon, synthetic fiber made of polyvinyl alcohol, or the like can be appropriately used.

In addition, as a chemical bond other than a hydrogen bond, there is a bond by intermolecular force using a binder. For example, a functional dispersion liquid containing a functional material (3) having no functional group capable of hydrogen bonding, such as pearl pigment, polyester synthetic fiber, and microcapsule, and a small amount of a binder component is wetted on a paper machine. By applying to the paper, it is possible to apply the functional material (3) to the inside of the paper layer (Q).

Next, the necessity that the functional material (3) has a width larger than the three-dimensional network (K) by the paper layer (Q) formed of fibers will be described. As shown in the enlarged view of FIG. 2, the paper of the present invention has a structure having a mesh (K) by forming a three-dimensionally complicated fiber in the paper layer (Q).

The functional material (3) of the present invention is a material having a width larger than the size (KW) of the three-dimensional mesh (K). The functional material (3) has a larger width than the three-dimensional network (K) of the paper layer (Q), and thus has no functional group capable of chemically bonding to the paper layer (Q) ( 3), the reason is that it does not fall out from the three-dimensional mesh (K) of the paper layer (Q) and the yield is within the paper layer (Q).

  The width larger than the three-dimensional network (K) of the paper layer (Q) means that the particle diameter larger than the three-dimensional network (K) of the paper layer (Q) if the functional material (3) is a pigment. That means. For the functional material (3) having a particle size larger than the three-dimensional network (K) of the paper layer (Q), for example, if the size of the network (K) is 10 μm, a metal pigment, a liquid crystal pigment, etc. There is.

If the functional material (3) is a fiber, the width larger than the three-dimensional network (K) of the paper layer (Q) means that the fiber is longer than the three-dimensional network (K) of the paper layer (Q). It means long. For the functional material (3) having a fiber length longer than the three-dimensional mesh (K) of the paper layer (Q), for example, if the size of the mesh (K) is 10 μm, NBKP fiber, cotton fiber, etc. There is.

Furthermore, if the functional material (3) is a strip, the width larger than the three-dimensional mesh (K) of the paper layer (Q) is longer than the three-dimensional mesh (K) of the paper layer (Q). The length of a strip. For the functional material (3) having a strip length longer than the three-dimensional mesh (K) of the paper layer (Q), for example, if the size of the mesh (K) is 10 μm, a metal strip, an aluminum thin strip There is a piece.

For the above reasons, in order to provide the functional material (3) in the paper layer (Q), the functional material (3) has a functional group capable of chemically bonding with the paper layer (Q) and / or It is necessary to have a width larger than the three-dimensional network in the paper layer (Q) formed of fibers.

Although details will be described later, the functional material (3) is a water-soluble material that does not inhibit the dispersion state of the dispersant, the water-soluble polymer, and the functional material (3) after the functional material (3) is dispersed in water. It can be applied by applying a functional dispersion prepared by adding a functional liquid, an organic solvent, or powder or fine particles to a wet paper on a paper machine.

  The functional dispersion liquid needs to have a concentration such that the functional materials (3) do not readily recombine with each other by hydrogen bonding, and is preferably used at a solid content concentration of about 0.1 to 3%. The solid content concentration in the present invention is the ratio of the functional material contained in the functional dispersion. However, if functional material (3) can be re-separated by adding strong stirring or dispersing agent to functional material (3), there is no problem even if it is about 3 to 35%.

  This is because, when the solid content concentration is 35% or higher, the recombination treatment may be necessary because the recombination of the functional materials (3) cannot be suppressed only by adding a stirring agent or a dispersing agent. On the contrary, if the solid content is a low concentration of 0.1% or less, there is a possibility of promoting swelling of the paper due to excessive moisture in the application and drying stages of the paper. However, there is no particular limitation as long as these problems can be avoided by other means.

The amount of the functional dispersion to be applied varies depending on the method of application, but it is necessary to prepare such that the solid content of the functional material (3) after drying is 0.01 g / m ² or more. If the solid content is less than 0.01 g / m ^2, it is difficult to visually recognize the application portion of the functional dispersion under visible light transmission, which is not preferable. Depending on the application method, the application limit amount at one time may be equal to or less than the amount, but in this case, application may be repeated several times to obtain a target solid content. The functional material (3) is coated with the functional dispersion liquid in the wet paper layer (Q) and then dried to produce the anti-counterfeit paper (1) of the present invention.

Next, another form of the anti-counterfeit paper will be described with reference to the plan view of the anti-counterfeit paper (1 ') according to the second embodiment of the present invention shown in FIG. The area (Z) of the anti-counterfeit paper (1 ′) shown in FIG. 4A cannot be viewed from the surface under reflected light as shown in FIG. As shown to 4 (b), the functional material (3) is provided so that it may be visually recognized under transmitted light.

FIG. 5 is a cross-sectional view of the anti-counterfeit paper (1 ′) taken along the line Y-Y ′ of FIG. The pattern (2) on the anti-counterfeit paper (1) described above with reference to the cross-sectional view of FIG. 2 has a configuration in which a plurality of functional materials (3) are provided in a solid line shape. The pattern (2) on the prevention paper (1 ′) has a configuration in which a plurality of functional materials (3) are provided in a broken line shape. Note that the paper layer (Q) and the functional material (3) to be used are the same as those in the forgery prevention paper (1) described above, and thus description thereof is omitted.

In a configuration in which functionality is added to a single-layer paper by adding a thread to the inside of the paper layer (Q) of the single-layer paper, which is disclosed in Patent Document 2, the thread is provided inside the paper layer (Q). However, in the present invention, a plurality of functional materials (3) can be provided regularly or irregularly by providing them with intervals (P2). It can be applied to a desired position in the paper layer (Q). Therefore, compared with the anti-counterfeit paper (1) shown in FIG. 2 applied in the form of a solid line, it becomes more difficult to reproduce, so that the anti-counterfeit resistance is increased and the functional material (3 ) Also increases the degree of freedom of the shape formed.

In addition, as another merit, it is possible to provide the paper layer (Q) with a space (P2), so that it is provided in the paper layer (Q) as compared with the case where the space (P2) is not provided and is applied in a solid line shape. The amount of material (3) is small. Therefore, the cost can be reduced as compared with the case where the solid line is used.

  Although the anti-counterfeit paper (1) has been described with a single-layer structure, if the functional material (3) is applied in the single-layer paper layer (Q), the single-layer structure is converted into a multilayer paper. A one-layer configuration is also possible.

  Next, the procedure for producing the anti-counterfeit paper (1, 1 ′) in which the functional material (3) is applied in the single paper layer (Q) shown in FIGS. 1 to 5 will be described. The flowchart of FIG. 6 and the schematic diagram of the long net paper machine (M) for producing the anti-counterfeit paper (1, 1 ′) shown in FIG. 7 will be described.

First, the paper making process in the long paper machine (M) will be described. The long net paper machine (M) is roughly divided into a preparation section (4), a wire section (5), a press section (6), a drying section (7), a calendar section (8), and a reel section (9). .

The preparation unit (4) is a raw material of the paper, removes large foreign matters such as entanglement or clumps of the stock (W), which is a solution in which the fibers forming the paper layer (Q) are dispersed in water, and disperses the fibers. Let

About the wire part (5), after supplying the paper stock (W) supplied from the preparation part (4) to the upper surface of the wire (5a), the basis weight balance in the width direction of the wire (5a) and fiber dispersion To form a sheet-like wet paper (10).

The press section (6) is dehydrated by applying pressure to the wet paper (10).

For the drying section (7), the wet paper (10) after dehydration is dried and the paper expansion and contraction is adjusted.

  About the calender part (8), it passes between the calender rolls (8a), and the surface of the paper after drying is smoothed by applying pressure, and the paper thickness is adjusted.

As for the reel unit (9), the wet paper (10) is turned into a sheet and sent to the next process.

Regarding the method for producing the anti-counterfeit paper (1, 1 ′) in which the functional material (3) is provided in the single paper layer (Q), first, as a moisture content adjusting step (ST1), a long net paper machine The moisture content of the wet paper (10) on the wire (5a) in the wire part (5) of (M) is adjusted.

Fig.8 (a) is a schematic diagram which shows a moisture content adjustment process (ST1). After supplying the stock (W) stored in the stock supply tank (4a) in the preparation section (4) onto the wire (5a) of the long net paper machine (M), the wire (5a) is moistened on the wire (5a). Form paper (10).

The concentration of the paper stock (W) is generally about 1 to 2% before the wire (5a) of the long web paper machine (M).

  Next, the moisture content of the wet paper (10) is adjusted.

In the present invention, although a detailed production method will be described later, a liquid in which a plurality of functional materials (3) are dispersed in the wet paper (10) in the paper making process is sprayed with a wet paper (10 ) After being applied inside, the stock (W) forming the wet paper (10) flows on the functional material (3) after the application, and covers the functional material (3). The functional material (3) is given in ().

When the functional material (3) is applied, if the moisture content of the wet paper (10) is large, the fiber forming the paper layer (Q) and the fluidity of the functional material (3) are high. The functional material (3) after application does not stay inside the wet paper (10), but diffuses throughout the wet paper (10) or passes through the wet paper (10), and on the wire (5a). It will stay. Therefore, it becomes impossible to apply the functional material (3) to a desired position in the paper layer (Q).

On the other hand, when the moisture content of the wet paper (10) is small, the functional material (3) after application is given due to the low fluidity of the fibers forming the paper layer (Q). 3), the stock (W) forming the wet paper (10) does not flow, and the functional material (3) remains exposed on the paper layer (Q). The functional material (3) cannot be applied to. Therefore, it is necessary to adjust the moisture content of the wet paper (10) before applying the functional material (3).

The moisture content of the wet paper (10) depends on the type and size of the functional material (3) to be applied, the type of fiber forming the paper layer (Q), the fiber length, and the like. On the other hand, after the liquid in which the functional material (3) is dispersed is applied to the inside of the wet paper (10) by nozzle injection, the wet paper (10) is formed on the functional material (3) after the application. The paper stock (W) to be flowed is adjusted as appropriate so that it can be covered, but in the present invention, the moisture content of the wet paper (10) is in the range of moisture content of 80 to 97%. It is preferable to do.

When the moisture content of the wet paper (10) is less than 80%, the same problem occurs as when the moisture content of the wet paper (10) is small. Further, when the moisture content exceeds 97%, the same problem as that occurs when the moisture content of the wet paper (10) is large.

The moisture content of the wet paper (10) is adjusted by dehydration. Specifically, the wet paper (10) on the wire (5a) is dehydrated by the vacuum pressure generated by the table roll (5b) under the wire (5a). In addition, dehydration can be performed by using a vacuum apparatus after a vacuum apparatus such as a suction box is provided together with the table roll (5b).

Next, as the nozzle injection flow rate adjustment step (ST2), the injection flow rate of the nozzle (11) for injecting the functional dispersion liquid (J) in which the functional material (3) is dispersed is adjusted.

FIG. 8B is a schematic diagram showing the nozzle injection flow rate adjustment step (ST2). A nozzle (11) is provided on the wire (5a) of the wire part (5) in the long net paper machine (M) after the moisture content adjusting step (ST1).

The nozzle (11) refers to an apparatus for injecting a solution in which the functional material (3) is dispersed, having at least one hole or slit.

In this invention, as shown in FIGS. 1-5, the functional material (3) is provided in the single layer paper layer (Q). As shown in FIG. 8C, this is because the functional dispersion (J) ejected from the nozzle (11) penetrates the surface (F) of the wet paper (10) and then the wet paper (10). This is because the injection flow rate of the nozzle (11) is adjusted so as to remain in the wet paper (10) without reaching the back surface (B).

Moreover, as for the surface (F) of the wet paper (10) immediately after providing a functional dispersion liquid (J), although a trace of a line remains in the provided location, as above-mentioned, in a moisture content adjustment process (ST1). By adjusting the moisture content of the wet paper (10), the paper material (W) that forms the wet paper (10) flows on the traces of the line and covers it. By flattening the surface (F), the functional dispersion (J) can be applied to the paper layer (Q) of the wet paper (10) as shown in FIG. 8 (d).

Therefore, in order to provide the functional material (3) in the single paper layer (Q), it is important to adjust the injection flow rate of the nozzle (11) in addition to the water content adjustment step (ST1) described above. It becomes. When the jet flow rate is large, the functional dispersion liquid (J) penetrates to the back surface (B) of the wet paper web (10). Conversely, when the jet flow rate is small, the functional dispersion liquid (J) 10) on the surface (F).

The optimum condition of the injection flow rate of the nozzle (11) for applying the functional dispersion liquid (J) into the paper layer (Q) of the wet paper (10) is the wet paper after the water content adjusting step (ST1) ( The basis weight of 10) and the moisture content are adjusted as appropriate according to the papermaking speed of the long paper machine (M). For example, the basis weight of the wet paper (10) after the moisture content adjustment step (ST1) is 85 g / m ^2. When the water content is 95% and the papermaking speed of the long paper machine (M) is 27 m / min, the injection flow rate is 500 ml / min.

The jet flow rate of the nozzle (11) was as described above, the basis weight of the wet paper (10) after the water content adjusting step (ST1) was 85 g / m ² , the water content was 95%, and the long net paper machine (M The injection flow rate, which is a value when the paper making speed of 27) is 27 m / min, is appropriately adjusted according to fluctuations in the basis weight, water content, and paper making speed, with a reference value of 500 ml / min.

For example, when the basis weight of the wet paper (10) is larger than 85 g / m ² , the injection flow rate is set larger than the reference value. When the basis weight is large, the amount of fibers in the wet paper (10) increases, so that the functional material (3) does not enter the paper layer (Q) at the reference value. Therefore, it is necessary to increase the injection flow rate and apply it at a high pressure.

Also, when the papermaking speed of the long paper machine (M) is faster than 27 m / min, the injection flow rate is made larger than the reference value. When the paper making speed is fast, the wet paper (10) on the wire (3) moves before entering the paper layer (Q), and the functional material (3) does not enter the paper layer (Q). It rides on the surface (F) of (Q). Therefore, it is necessary to increase the injection flow rate and apply it at a high pressure.

Further, when the moisture content of the wet paper (10) is higher than 95%, the injection flow rate is made smaller than the reference value. When the moisture content is high, the amount of fibers in the wet paper (10) decreases, and therefore, at the reference value, the functional material (3) penetrates the paper layer (Q) to the back surface (B) of the wet paper (10). It will come out. Therefore, it is necessary to reduce the injection flow rate and apply it at a low pressure.

The injection flow rate varies depending on the shape of the injection port of the nozzle (11), the basis weight of the functional material (3), the solid content concentration, and the like, and therefore is adjusted as appropriate.

  Further, the number of nozzles (11) is not limited to one, and a plurality of nozzles (11) may be installed.

Next, as the functional dispersion providing step (ST3), the functional dispersion is performed from the nozzle (11) after the nozzle injection flow rate adjustment step (ST2) to the wet paper (10) after the moisture amount adjustment step (ST1). Apply liquid (J).

FIG.8 (c) is a schematic diagram which shows a functional dispersion liquid provision process (ST3). As shown in FIG.8 (c), a functional dispersion liquid (J) is injected and provided from the nozzle (11) installed on the wire (5a).

The solid content concentration of the functional dispersion (J) is preferably 0.1 to 4%. When the solid content concentration exceeds 3%, depending on the injection flow rate of the nozzle (11) and the shape of the injection port, the functional material (3) is clogged in the nozzle (11), which is not preferable.

In addition, when the solid content concentration is less than 1%, the functional material (3) can be provided in the paper layer (Q), but when the anti-counterfeit paper (1, 1 ′) is obtained, The visibility of the pattern (2) and the machine readability of the functional material (3) are unfavorable.

  The nozzle (11) may be provided with a timer and a control device such as a pump and a solenoid valve. After attaching the timer and the control device, the functional dispersion (J) is automatically applied to the wet paper (10) at a predetermined timing by setting the timing for injecting the functional dispersion (J). It becomes possible.

  In addition, when producing the forgery prevention paper (1 ') shown in FIG. 4 described above, it is necessary to apply the functional dispersion liquid (J) at intervals. Therefore, after attaching the control device to the nozzle (11), using the control device, the functional dispersion liquid (J) is turned on and off at a desired interval by switching on and off the functional dispersion liquid (J). It is possible to apply the wet paper (10) with a gap.

  FIG. 9 is an enlarged view of the region (Z) of the anti-counterfeit paper (1 ′) in FIG. When producing the anti-counterfeit paper (1 ′) having the pattern (2) formed by applying a plurality of functional materials (3) at intervals, as shown in FIG. Measure the paper making speed per second of the paper machine (M). When the papermaking speed of the long net paper machine (M) is 27 m / min, the papermaking speed per second is 450 mm / sec.

  Next, the length (P1) of the location to which the plurality of functional materials (3) are applied is set. For example, in FIG. 9, P1 = 20 mm. Next, the time for applying the functional material (3), that is, the time for turning on the functional dispersion (J) from the nozzle (11) is calculated. The time for turning on can be calculated by dividing the length (P1) of the portion to which the functional material (3) is applied by the papermaking speed per second of the long net paper machine (M). In FIG. 9, the calculation is 0.044 sec.

  Next, the length (P2) of the part which does not provide a plurality of functional materials (3) is set. For example, in FIG. 9, P2 = 20 mm. Next, a time during which the functional material (3) is not applied, that is, a time during which the functional dispersion (J) is turned off from the nozzle (11) is calculated. The time for turning off can be calculated by dividing the length (P2) of the portion where the functional material (3) is not applied by the paper making speed per second of the long net paper machine (M). In FIG. 9, the calculation is 0.044 sec.

  As described above, the pattern (2) having a portion to which the functional material (3) of FIG. 9 is not applied can be formed by turning on / off the functional dispersion (J) every 0.044 sec. Become.

  The wet paper (10) after application of the functional dispersion (J) is converted into the wet paper (10) and the functional dispersion (J) in the process of dehydration on the wire (5a) of the wire part (5). The dispersed functional material (3) bonds the fibers by entanglement between fibers, hydrogen bonding, etc., and the functional material (3) is contained in a single paper layer (Q) as shown in FIG. The anti-counterfeit paper (1) provided with is produced.

Thereafter, the wet paper web (10) is further dehydrated by a plurality of press rolls (6a) arranged in the press section (6), and then the wet paper web (10) is removed by the cylindrical dryer (7a) of the drying section (7). Moisture and residual moisture in the functional dispersion (J) are evaporated to dryness.

Finally, the calender part (8) is passed between the calender rolls (8a), and pressure is applied to smooth the surface of the paper after drying, and after adjusting the paper thickness, the reel part ( In 9), the wet paper (10) that has become the anti-counterfeit paper (S) is taken up and sent to the next process.

  A first embodiment of the present invention will be described with reference to FIGS. Example 1 shows an example in which an anti-counterfeit paper (1) in which a plurality of functional materials (3) are provided in a solid line in a single paper layer (Q) is shown.

  Abaca pulp was used as the fiber forming the paper layer (Q). As the functional material (3), colored rice straw pulp was used as a material having a functional group capable of chemically bonding with wet paper.

The functional dispersion (J) was prepared by dispersing colored rice straw pulp, which is the functional material (3), in water at a solid content concentration of 0.35%.

Next, as a moisture content adjusting step (ST1), a paper supply tank is used on the wire (5a) of the long paper machine (M) using the long paper machine (M) shown in FIGS. After supplying the stock (W) for forming the paper layer (Q) from (4a), the wet paper (10) is formed on the wire (5a).

  Next, the moisture content of the wet paper (10) was dehydrated using a table roll (5b) and a suction box to adjust the water content to 95%.

Next, as the nozzle injection flow rate adjustment step (ST2), the injection flow rate of the nozzle (11) was adjusted to 500 ml / min. The nozzle (11) used was a circular one with a nozzle diameter of 1.5 mm. The injection flow rate was adjusted by connecting the flow pump to the nozzle (11) and then adjusting the inverter of the flow pump.

Next, as the functional dispersion applying step (ST3), the functional dispersion (J) is sent to the wet paper (10) after the water content adjusting step (ST1) using a pump, and the nozzle ( 11) At this time, the distance between the nozzle (11) and the surface of the wet paper (10) was 50 mm.

  Then, the moisture of the wet paper (10) is dehydrated by the water extraction box installed at the lower part of the wire (5a), and the colored rice straw pulp as the functional material (3) and the wet paper (10) are intertwined with each other. Bonded by bonding. Furthermore, after dehydrating with a press roll, drying and calendering make the bond between fibers stronger, and anti-counterfeiting in which the functional material (3) is applied inside the single paper layer (Q). Paper (1) was obtained.

  A second embodiment of the present invention will be described with reference to FIGS. Example 2 shows an example in which an anti-counterfeit paper (1 ') in which a plurality of functional materials (3) are provided in a broken line shape in a single paper layer (Q) is shown.

Wood pulp (LBKP) was used as the fiber forming the paper layer (Q). Moreover, the functional material (3) used the cellulose nanofiber which has a functional group which can be chemically combined with wet paper.

The functional dispersion (J) was prepared by dispersing cellulose nanofibers, which are the functional material (3), in water at a solid content concentration of 1%.

Next, as a moisture content adjusting step (ST1), using the apparatus shown in FIGS. 7 and 8, the paper layer (4a) is fed to the paper layer (4a) on the wire (5a) of the long net paper machine (M). After supplying the stock (W) forming Q), the wet paper (10) is formed on the wire (5a).

  Next, the moisture content of the wet paper (10) was dehydrated using a table roll (5b) and a suction box to adjust the moisture content to 94%.

Next, as the nozzle injection flow rate adjustment step (ST2), the injection flow rate of the nozzle (11) was adjusted to 550 ml / min. The nozzle (11) used was a circular one with a nozzle diameter of 1.5 mm. The injection flow rate was adjusted by connecting the flow pump to the nozzle (11) and then adjusting the inverter of the flow pump.

Next, as the functional dispersion applying step (ST3), the functional dispersion (J) is flowed to the wet paper (10) after the water content adjusting step (ST1) using a pump connected to the control device. Then, it was ejected from the nozzle (11) at a fixed interval.

Next, the timing for injecting the functional dispersion (J) was set. The timing setting will be described with reference to FIG. 9 described above.

First, the paper making speed per second was measured. Since the papermaking speed of the long net paper machine (M) is 30 m / min, the papermaking speed per second was 500 mm / sec.

  Next, the length (P1) of the location to which the functional material (3) is applied was set. In Example 2, P1 = 10 mm. Next, the time for turning on the injection of the functional dispersion liquid (J) from the nozzle (11), which is the time for applying the functional material (3), was calculated. When the time for turning on was calculated, it was 0.02 sec.

  Next, the length (P2) of the part which does not provide a functional material (3) was set. In Example 2, P2 = 20 mm. Next, the time during which the functional dispersion liquid (J) is turned off from the nozzle (11), which is the time during which the functional material (3) is not applied, was calculated. The time for turning off was calculated to be 0.04 sec.

  Based on the above calculation results, the functional dispersion liquid (J) was jetted by turning the nozzle (11) on for 0.02 sec and then turning off for 0.04 sec. At this time, the distance between the nozzle (11) and the surface of the wet paper (10) was 50 mm.

  After that, the water content of the stock (W) is dehydrated by the water extraction box installed at the lower part of the wire (5a), and the wood pulp (LBKP) and the cellulose nanofiber which is the functional material (3) are bound by entanglement or hydrogen bonding. did. By further dehydrating with a press roll, drying, and calendering, the bond between fibers is further strengthened, and the anti-counterfeit paper (3) provided with the functional material (3) inside the single paper layer (Q) ( 1 ').

DESCRIPTION OF SYMBOLS 1 Paper layer 2 Pattern 3 Functional material 4 Preparation part 4a Paper supply tank 5 Wire part 5a Wire 5b Table roll 6 Press part 7 Drying part 7a Cylindrical dryer 8 Calender part 8a Calendar roll 9 Reel part 10 Wet paper 11 Nozzle W Paper J Functional dispersion M Long net paper machine 1, 1 'Anti-counterfeit paper

Claims (3)

A part of the paper layer in a single-layer paper has a pattern formed at the same depth from the surface of the paper,
The pattern may be a strip having a strip length longer than the width of a three-dimensional network having a functional group capable of hydrogen bonding with the paper layer and / or a paper layer formed of fibers, a pigment having a large particle size, or a long length. An anti-counterfeit paper comprising at least one functional material having a fiber having a fiber length . A method of manufacturing a paper provided with a functional material using a paper machine,
The functional material is a material having a functional group capable of chemically bonding with a wet paper and / or a material having a width larger than a three-dimensional network formed by a paper layer formed of fibers.
Adjusting the flow rate of the nozzle for injecting the dispersion liquid in which the functional material is dispersed on the wire portion in the paper machine;
Adjusting the moisture content of the wet paper on the wire portion in order to impart the functional material to the inside of the wet paper in a single layer;
A step of applying the functional dispersion liquid from the nozzle after the jet flow rate adjustment step to the same depth in the paper layer from the surface of the paper with respect to the wet paper after the moisture amount adjustment step. A method for producing anti-counterfeit paper characterized by   The method for producing anti-counterfeit paper according to claim 2, wherein the moisture content adjusting step adjusts the moisture content of the wet paper to 80 to 97%.

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