WO2014185686A1

WO2014185686A1 - Recording medium for security

Info

Publication number: WO2014185686A1
Application number: PCT/KR2014/004266
Authority: WO
Inventors: 김경훈; 이활종; 김재환
Original assignee: 주식회사 티엔에프; 주식회사 소재의맥
Priority date: 2013-05-16
Filing date: 2014-05-13
Publication date: 2014-11-20
Also published as: KR101341164B1

Abstract

Disclosed is a recording medium for security, comprising: a detection base layer containing a material for detection and having a printable base integrated with the material for detection; and a shielding layer formed on both sides of the detection base layer so as to shield the material for detection. Here, the material for detection can be a soft magnetic material having a residual magnetic flux density of 0.1T or more, a coercive force of 1 to 50A/m and a magnetic permeability of 500 to 100,000H/m, when the frequency is 10kHz.

Description

Security record carrier

The present invention relates to a security recording medium, and more particularly to a security recording medium containing a detection material for preventing the leakage of the recording medium such as paper or film to the outside.

As the importance of information is recently emphasized, the necessity and interest in the security of such information is increasing day by day. As security technology for controlling the export of various storage media has been developed day by day, and the need to control the export of printed documents increases, there is an attempt to prevent the export by attaching a detection tag to the secure document.

That is, by installing a detection gate at the entrance and exit, it detects when the document with the detection tag passes through the detection gate to provide an alarm signal to prevent the carrying out. Such technology is currently used to prevent the unauthorized release of various books and documents in a library or a company.

The detection method of the detection tag is an electromagnetic method that detects a change in a magnetic field when a detection tag, which is typically made of a soft magnetic material, passes through an alternating magnetic field generated by a detection means such as a detection gate. There is a metal detector that detects electromagnetic and general metal materials.

Electromagnetic method refers to a method using an electromagnetic field. When a soft magnetic material is placed in an alternating magnetic field at a frequency of several Hz to several KHz, a change in the alternating magnetic field is generated and the harmonics are read and detected. In order for the soft magnetic material to function as a sensor, the more saturation is possible in the weak external magnetic field, the larger the area of the magnetic hysteresis loop, and the greater the saturation magnetic flux density.

Metal-detection detectors are tools designed to sense invisible metal materials using electromagnetic induction and eddy currents. When a magnetic field is generated by a coil through which an alternating current flows, eddy currents are generated in the metal. Metal detectors use the magnetic field generated by these eddy currents to detect metal. In more detail, the metal detector consists of a pair of coils and an electronic circuit for control. Applying alternating current to the coil generates a periodically changing magnetic field in the coil.If there is a metal material under the coil, a eddy current is induced by the changing magnetic field, which causes the metal material to generate a magnetic field, Senses the change in the magnetic field and senses the metallic material.

However, in order to utilize the detection system, a procedure or a process of attaching a detection tag or a detection label to each sheet of a security document is required, and a lot of labor and expensive costs are generated in the process.

In addition, there is a problem that causes a malfunction of the device and shorten the life of the device when used as a paper in the printer, fax, etc. with the detection tag attached to the outside of the document, attached to the detection tag on the outside of the document If you do not print or copy without a problem there is a problem that can be missed by mistake or intentional detection tag.

In addition, since the detection tag is exposed to the outside, the user can recognize the existence of the detection tag and intentionally damage the tag to leak the document.

In order to solve this problem, a security printing paper in which a tag for detection is attached to one paper and the other paper is laminated (Korean Patent Publication No. 2008-0107977) has been proposed. However, in the case of such security printing paper, a process of attaching a detection tag to one sheet of paper and laminating the other paper is required.As the adhesive is used for lamination, harmful substances are released when the printer outputs the document, There is a problem that the paper is peeled off to cause jams during printing. In addition, in the prior art, when the carbon black is added to the lamination process to shield the tag, the whiteness of the paper is lowered and the image quality is lowered. When the sheet containing the tag for detection is overlapped and passed through the gate, There is a problem that detection is not easy.

In addition, according to the related art, since a tag or a detection label for detection is easily recognized, there is a problem in that the document is easily leaked by removing or damaging it.

The present invention is to solve the above conventional problems, an object of the present invention is to provide a security recording medium that can be easily detected at the detection gate using a detection material with excellent detection power.

In addition, the present invention by shielding the detector material using a material having excellent shielding power, it is possible to prevent the detector material from being exposed to the outer surface of the paper, security recording medium that can prevent damage or removal of the detector material The purpose is to provide.

In addition, the present invention can prevent the detection of the detector material from the printing paper by mixing the detection material in the form of a wire or a tag or the like at the time of papermaking or extrusion to form integrally with the printing paper, and a separate adhesive It is an object of the present invention to provide a security recording medium that does not need to be used.

The security recording medium of the present invention for solving the above problems comprises a detector material layer containing a detection material and integrally formed with the detection material and a printable substrate, and formed on both sides of the detector material layer to detect the detection material. And a shielding layer for shielding the solvent substance. At this time, the detection material is a soft magnetic material having a residual magnetic flux density of 0.1T or more, a coercive force of 1 to 50 A / m, and a magnetic permeability of 500 to 100,000 H / m at a frequency of 10 Hz.

The printable substrate of the security record carrier may be paper or film, and in the case of a film, may further include an undercoat layer formed between the detector material layer and the shielding layer.

In this case, the undercoat layer contains at least one of polyol resin, acrylic resin, polyurethane resin or vinyl resin, the thickness of the undercoat layer is preferably 0.1 ~ 5㎛.

The soft magnetic material may be at least one selected from the group consisting of Permalloy, Ferrite, Amorphous alloys, and Sendust, and the material for detecting soft magnetics has a thickness of 5 to 30 μm and a length thereof. It may be incorporated in the form of a tag having a width of 1 to 10 cm, a width of 0.5 to 2 mm, or a wire having a thickness of 1 to 15 μm, a length of 5 to 10 cm, and a width of 0.1 to 0.5 mm.

It is preferable that the thickness of a detector material layer is 50-150 micrometers, and it is preferable that the thickness of the said shielding layer is 5-30 micrometers.

The shielding layer may contain an inorganic material and a resin, wherein the inorganic material is at least one selected from the group consisting of clay, calcium carbonate, titanium dioxide, silica, alumina and talc, and the resin is latex, cellulose, polyvinyl alcohol and polyvinyl. It may be at least one selected from the group consisting of pyrrolidone.

According to the present invention, by using a detection material having excellent detection power in the detector material layer, a document or the like can be easily detected at the detection gate, thereby preventing the important document or the like from leaking out.

Further, according to the present invention, it is difficult to recognize the detector material from the outside by mixing the main material for printing and the detection material at the time of papermaking or extrusion in the form of a wire or a tag and integrally formed with the printing substrate. Therefore, it is possible to prevent the intentional damage to the detector material, and because it is not necessary to use a separate adhesive or attach the detector material separately, it is possible to minimize the emission of harmful substances, to simplify the manufacturing process, the detection material Peeling from this printing paper can be prevented. In addition, since the detector material is formed integrally with a printing paper or the like, it is possible to maintain excellent running performance and image quality during printing.

In addition, according to the present invention, by shielding the detector material using a material having excellent shielding power, the detector material can be prevented from being exposed to the outer surface of the paper, thereby preventing damage or removal of the detector material.

1 is a cross-sectional view of a security recording medium according to an embodiment of the present invention.

2 is a cross-sectional view of a security recording medium according to another embodiment of the present invention.

3 is a flowchart illustrating a method of manufacturing a security recording medium according to the present invention.

[Description of the code]

10: detector material 20: shielding layer

30: undercoating layer

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, the term "recording medium" as used herein refers to a printable recording medium, such as paper or film.

According to FIG. 1, the security recording medium of the present invention includes a detector material layer 10 and a shielding layer 20. Here, the security recording medium is formed of a printable substrate, it may be such as paper or film.

The detector material layer 10 contains a detection material sensitive to the detection system. Therefore, when the printable recording medium according to the present invention is taken out, the detection system can detect the detection material contained in the detector material layer 10, thereby preventing the leakage of the recording medium such as printing paper. do.

The detector material layer 10 is made of a general paper component together with a detection material. That is, the detector material layer contains conifers and hardwood pearls, calcium carbonate, and alkyneketene dimers, antifoaming agents, wet strength enhancers, polyaluminum chlorides as a fixing agent, and cationic polyacrylamides.

The detection material contained in the detector material layer 10 may be a soft magnetic material. In this case, the soft magnetic material may be a soft ferrite, amorphous alloy, permalloy (Fe + Ni), sendest (Sendust, Fe + Al + silicon), a composite material thereof, or the like. Here, the amorphous alloy is a mixture of metals such as Fe, Ni, Cr, and can be produced by varying the ratio of each metal during manufacture.

Such a soft magnetic material is mixed in the form of a wire or a tag in the papermaking step when the detector material layer 10 is formed.

When the soft magnetic material is in the form of a tag, it is important to adjust the thickness, length and width of the tag. Too thin a tag may cause a problem in detection power, and too thick may be difficult to incorporate during papermaking or extrusion. In addition, irregularities are formed on the surface of the paper, which may cause problems with the printability and image quality.

In addition, if the length of the tag is too short may cause a problem in the detection force, too long may not only be difficult to mix during papermaking or extrusion, but also damage the blade when cutting the paper. In addition, if the width of the tag is too narrow as well as the length, a problem occurs in the detection force. If the width is too large, it is difficult to mix during papermaking or extrusion, and the blade may be damaged when cutting the paper.

Even when the soft magnetic material is in the form of a wire, it should have an appropriate dimension for the same reason as the tag.

Therefore, when the soft magnetic material is in the form of a tag, the thickness is preferably 5 to 30 μm, the length is 1 to 10 cm, and the width is 0.5 to 2 mm, and in the case of the wire form, the thickness is 1 to 15 μm. It is preferable that length is 5-10 cm and width is 0.1-0.5 mm. In the case of the wire form, the smaller the thickness, the length, the width, and the like as the mesh characteristics, the more preferable.

On the other hand, not all soft magnetic materials are detected by a detection system such as an electromagnetic method. That is, in order to be detectable by the detection system, the soft magnetic material must have desirable characteristics in residual magnetic flux density, coercive force, permeability, and the like.

The soft magnetic material according to the present invention has a residual magnetic flux density of 0.1T (Tesla) or higher at a frequency of 10 Hz, a coercive force of 1 to 50 A / m, and a magnetic permeability of 500 to 100,000 H / m. Easily detected in both systems and metal detection systems. The smaller the coercive force, the smaller the value. However, if the value is less than 1, the brittleness of the material becomes large, and when the soft magnetic material is manufactured in the form of a tag or wire, the coercive force does not show its original function.

The soft magnetic material according to the present invention has high magnetic flux density, low coercive force and small residual magnetization, and has a high permeability. Therefore, the soft magnetic material is magnetized only when an external magnetic field is applied, and the magnetic properties are almost eliminated when the external magnetic field is removed. Therefore, paper containing such a soft magnetic material can be easily detected at an electromagnetic detection gate.

On the other hand, the thickness of the detector material layer 10 is also important. If the thickness of the detector material layer is too thick, it is advantageous for shielding soft magnetic wires or tags, and there is no curl problem when producing paper, but the unit cost increases, and printer runability and fixing Problems with sex On the other hand, if the thickness of the detector material layer is too thin, the fixing property in the printer is increased, and the unit cost is advantageous, but it is disadvantageous to shield the soft magnetic material, and the curling problem of the paper occurs. Therefore, the thickness of the detector material layer 10 is preferably 30 ~ 400㎛ in consideration of the process conditions, shielding properties, printer aptitude. More preferably, the thickness of the detector material layer 10 may be 50 ~ 150㎛.

Next, the shielding layer 20 is demonstrated.

The shielding layer 20 may be formed on both sides of the detector material layer 10. The shielding layer 20 is introduced to shield the soft magnetic material and to fix the toner or the ink. That is, the shielding layer 20 adheres toner or ink to paper when printing the printer so that excellent image quality can be maintained. In addition, the shielding layer 20 may be used for the purpose of improving the whiteness of the paper by sharpening the image quality of the paper.

Various inorganic materials and resins may be used as the material of the shielding layer 20. In order to improve the shielding ability, inorganic materials such as clay, calcium carbonate, titanium dioxide, silica, alumina, and talc may be used as the shielding layer 20 material, and may include latex, carboxymethyl cellulose, hydroxymethyl cellulose, and hydroxypropyl methyl cellulose. Resin, such as a cellulose resin, polyvinyl alcohol, polyvinylpyrrolidone, etc. may be used together. In this case, the inorganic material may typically be a white pigment or an off-white pigment.

On the other hand, it is preferable that the ratio of the inorganic and resin to parts by weight is 5:90 to 50:50. If the content of the resin is too high, the toner is too strongly adhered to the paper in the laser printer, so that the warp-warp- jam) may occur, and ink absorption or drying speed may decrease in the inkjet printer.

In addition, the thickness of the shielding layer 20 is preferably 5 ~ 30㎛ in consideration of the shielding force of the soft magnetic material, the fixability of the toner or ink. If the thickness of the shielding layer 20 is too thick, it is excellent in shielding power, but the toner fixing property is poor, and if too thin, the shielding power is inferior.

The shielding layer 20 may be formed on both sides of the detector material layer 10, or may be formed by coating two or more times on one surface of the detector material.

Next, another embodiment of the present invention will be described with reference to FIG. 2 is a cross-sectional view of a security recording medium according to another embodiment of the present invention.

Referring to FIG. 2, the security recording medium of the present invention includes a detector material layer 10, a shielding layer 20, and an undercoat layer 30. Such a security recording medium may be in the form of a film.

The detector material layer 10 contains a conventional film component and a detection material. Typical film components include polyethylene terephthalate, polycarbonate, cellulose acetate, polyolefin, polyester and the like.

The detection material contained in the detector material layer 10 has the same properties as described with reference to FIG. 1 and is mixed in the form of a wire or a tag during film extrusion.

In addition, since the shielding layer 20 is the same as that described above with reference to FIG. 1, a description thereof will be omitted.

On the other hand, in the case of a film, in order to improve the binding force of the detector material layer 10 and the shielding layer 20, it is preferable to introduce a separate undercoat layer 30 therebetween. That is, the undercoating layer 30 is not largely necessary for the paper detector material, but is particularly necessary when a film is used as the detector material. This is because when the adhesive force between the detector material layer 10 and the shielding layer 20 falls, the toner or ink may not be properly adhered to the paper during printer printing, and even the shielding layer 20 may be peeled off.

The undercoat layer 30 may be formed of a resin, and may be formed of a resin such as a polyol resin, an acrylic resin, a polyurethane resin, a vinyl resin, and a curing agent such as isocyanate. Moreover, various kinds of inorganic substance can be added as needed.

It is preferable that the thickness of the undercoat layer 30 is 0.1 to 5 μm. If the thickness is too thick, there is a problem in the toner fixability or ink absorbency, and if the thickness is too thin, it is difficult to apply a proper thickness because it has a problem in adhesion. .

Hereinafter, a manufacturing process of the security recording medium according to the present invention will be described with reference to FIG. 3 is a flowchart for explaining a security recording medium manufacturing process of the present invention.

First, the detector material layer is formed to a thickness of 30 ~ 400㎛.

If the recording medium for security is paper, conifer and hardwood pulp 80 ~ 85%, calcium carbonate 10 ~ 15%, size alkyneketene dimer and antifoaming agent 0.8%, wetting strength enhancer 1.5%, fixing agent 2.5% polyaluminum chloride, cation 0.05% of polyacrylamide is mixed to produce a base paper (S100), and a mixed slurry is prepared by adding a soft magnetic wire or a tag (S110) while papermaking using a long and short paper machine (S120). The method of adding a wire or a tag can be used as long as it is a general method such as lumen loading in the conventional multilayer papermaking method or impact method in high speed airflow.

At this time, in order to increase the shielding power of the soft magnetic material may be added a coloring dye at papermaking. If silver or gray soft magnetic materials are included in paper or film, they can be easily visually recognized. Therefore, it is preferable to use colored dyes similar to soft magnetic materials in papermaking or extrusion so that the color of the paper or film is similar to the soft magnetic material. However, if the color of the coloring dye is too dark, it may be reduced whiteness (whiteness), so the image sharpness may be reduced in consideration of this it is necessary to adjust the color appropriately.

After forming the sheet of paper, an oxide starch, a starch curing agent, or the like is applied on the surface of the sheet pressed in the size press by about 2 µm to complete the final sheet (detection base layer). If necessary, a super calendering process may be performed.

When the recording medium for security is a film, a dye is added to a resin such as polyethylene terephthalate, polycarbonate, cellulose acetate, polyolefin, polyester, etc. to prepare a film (S200).

Thereafter, when the film is extruded, a soft magnetic wire or a tag is mixed (S110) to form a detector material layer.

Next, in the case of a film on both sides of the detector material layer to form an undercoat layer (S210). Examples of the undercoat resin include polyol resins, acrylic resins, polyurethane resins, and vinyl resins. This undercoat layer is preferably coated with a thickness of about 0.1 ~ 5㎛.

Finally, in the case of paper, the shielding layer is formed on both sides of the detector material layer and in the case of the film on the undercoat layer (S130). As the coating solvent of the shielding layer, it is preferable to use an aqueous system in consideration of environmental problems and workability. Although water is mainly used, alcohol, glycol ether, ketone, etc. may be used together with water in consideration of dissolution of the resin and drying after coating.

Various coating methods may be used for applying the shielding layer, but a braid, gravure, comma, reverse, bar method, and the like are more suitable, but any general method used for coating may be used.

Hereinafter, examples and comparative examples of the recording medium for security according to the present invention will be described in more detail, but the scope of the present invention is not limited thereto.

[실시예 1] 내지 [실시예 10][Example 1] to [Example 10]

1. 검출기재층 형성(백상지 제조)1. Detector layer formation (white paper production)

A soft magnetic material having a composition of FeCoBNbCr (JMC Co., JR02-AC) was made into a tag form to exhibit the characteristics as shown in Table 1, and then put into a papermaking process to make a white paper having a thickness of 90 μm. At this time, REMCOMP C-100 manufactured by Magnet-Physik Co., Ltd. was used as a magnetic characteristic analyzer.

Table 1

	Thickness (㎛)	Length (cm)	Width (mm)	Residual flux density (T)	Coercive force (A / m)	Permeability (H / m)
Example 1	15	5.0	1.5	0.47	15	77,000
Example 2	15	3.0	1.5	0.40	20	55,000
Example 3	15	2.0	1.5	0.32	30	30,000
Example 4	15	5.0	1.0	0.42	17	60,000
Example 5	15	5.0	0.5	0.27	40	18,000
Example 6	15	3.0	1.0	0.35	30	40,000
Example 7	15	3.0	0.5	0.20	45	6,000
Example 8	15	2.0	0.5	0.17	50	3,000
Example 9	15	10.0	2.0	0.50	10	95,000
Example 10	15	1.0	0.5	0.10	50	500

2. 차폐층 형성2. Shielding layer formation

The shielding layer is formed by forming and applying a shielding layer coating solution on both sides of the white paper produced as shown in Table 1, as shown in Table 2 below. The shielding layer was dried to obtain a paper having a thickness of 110 m.

TABLE 2

Composition	Creation costs
Latex (LG Chem, Lutex 704)	3.0 parts by weight
Calcium Carbonate (manufactured by Omiya, Covercarb75-KU)	13.5 parts by weight
Titanium Dioxide (manufactured by Dupont, Ts-6200)	13.5 parts by weight
water	70.0 parts by weight

[실시예 11] 및 [실시예 12][Example 11] and [Example 12]

The soft magnetic material having the composition of Permalloy (JMC Co., Ltd., JR01) was made into a tag form to exhibit the characteristics as shown in Table 3, and then put into a papermaking process to make a white paper having a thickness of 90 μm. Subsequently, after forming and applying a shielding layer coating solution to the composition shown in Table 2, and then dried to obtain a paper having a thickness of 110 ㎛.

TABLE 3

	Thickness (㎛)	Length (cm)	Width (mm)	Residual flux density (T)	Coercive force (A / m)	Permeability (H / m)
Example 11 Fe 20% Ni 80%	15	5.0	1.0.	0.35	25	55,000
Example 12 Fe 55% Ni 45%	15	5.0	1.0	0.32	20	45,000

[실시예 13 ]Example 13

1. 검출기재층 형성1. Detector layer formation

A soft magnetic material having a composition of FeCoBNbCr (JMC Co., JR02-AC) was made into a tag form to exhibit the characteristics as shown in Table 4, and then put in a polyethylene terephthalate extrusion process to make a 98 μm thick film (detection base layer).

Table 4

	Thickness (㎛)	Length (cm)	Width (mm)	Residual flux density (T)	Coercive force (A / m)	Permeability (H / m)
Example 13	15	5.0	1.0	0.40	17	58,000

2. 언더코팅층 형성2. Undercoat layer formation

On the both sides of the polyethylene terephthalate film produced as shown in Table 4 was made and applied to the undercoat coating solution with a composition as shown in Table 5 and then dried to obtain a film having a thickness of 100㎛.

Table 5

Composition	Creation costs
Polyol (manufactured by Shinsung Chemical Co., Ltd., DL-505SA-1)	90 parts by weight
Polyisocyanate (made by Shinsung Chemical Co., Ltd.)	10 parts by weight

3. 차폐층 형성3. Shielding layer formation

The polyethylene terephthalate film produced as described above was applied to make a shielding layer coating liquid with a composition as shown in Table 2, and then dried to obtain a film having a thickness of 120㎛.

[비교예 1]Comparative Example 1

A security printing paper made by Corate, disclosed in Korean Laid-Open Patent No. 2008-0107977.

[비교예 2] 내지 [비교예 6] [Comparative Example 2] to [Comparative Example 6]

After making a soft magnetic material having a composition of FeCoBNbCr (JMC Co., JR02-AC) in the form of a tag so as to exhibit the characteristics shown in Table 6, and then put into a papermaking process to make a 90㎛ white paper, the surface of the white paper A shielding layer coating solution was prepared and applied with the same composition, and then dried to obtain a paper having a thickness of 110 μm.

Table 6

	Thickness (㎛)	Length (cm)	Width (mm)	Residual flux density (T)	Coercive force (A / m)	Permeability (H / m)
Comparative Example 2	15	0.5	1.0	0.04	75	100
Comparative Example 3	15	5.0	0.3	0.08	60	250
Comparative Example 4	15	10.0	0.3	0.09	55	450
Comparative Example 5	15	0.5	2.0	0.05	65	200
Comparative Example 6	35	10.0	1.0	0.45	10	85,000
Comparative Example 7	15	20.0	1.5	0.55	10	100,500

[비교예 8]Comparative Example 8

The paper was prepared in the same manner as in Example 4, but the shielding layer coating liquid was not applied. That is, the paper in which the shielding layer was not formed was produced.

[비교예 9]Comparative Example 9

Paper was prepared in the same manner as in Example 4, but the thickness of the entire paper was formed to be 98 μm. That is, the paper was prepared so as to apply a shielding layer coating liquid and then to a thickness of 98㎛ after drying.

[비교예 10]Comparative Example 10

Paper was prepared in the same manner as in Example 4, but the thickness of the entire paper was formed to be 150 μm. That is, the paper was prepared so as to apply a shielding layer coating liquid and then to a thickness of 150㎛ after drying.

[실험 결과] 평가자료[Experimental Results] Evaluation Data

Evaluation of the Examples 1 to 13, and Comparative Examples 1 to 10 by various items to obtain the results shown in Table 7.

TABLE 7

	Sensitivity (%)	Shielding force	EM Sensitivity	Metal Sensitivity	OD		Ink absorbance (s)	Toner Fixability (%)	TVOC emissions (ppm)
	Sensitivity (%)	Shielding force	EM Sensitivity	Metal Sensitivity	Inkjet	laser	Ink absorbance (s)	Toner Fixability (%)	TVOC emissions (ppm)
Example 1	130	○	5	○	1.5	1.5	15	95	10
Example 2	130	◎	4	○	1.5	1.5	15	95	5
Example 3	130	◎	3	○	1.5	1.5	15	95	5
Example 4	130	◎	4	○	1.5	1.5	15	95	5
Example 5	130	◎	2	○	1.5	1.5	15	95	10
Example 6	130	◎	3	○	1.5	1.5	15	95	10
Example 7	130	◎	2	○	1.5	1.5	15	95	5
Example 8	130	◎	2	○	1.5	1.5	15	95	5
Example 9	130	△	5	○	1.5	1.5	15	95	5
Example 10	130	◎	One	○	1.5	1.5	15	95	10
Example 11	130	◎	3	○	1.5	1.5	15	95	5
Example 12	130	◎	4	○	1.5	1.5	15	95	10
Example 13	135	◎	4	○	1.4	1.5	20	95	5
Comparative Example 1	100	◎	4	○	1.2	1.3	25	95	150
Comparative Example 2	130	◎	X	×	1.5	1.5	15	95	5
Comparative Example 3	130	◎	X	×	1.5	1.5	15	95	5
Comparative Example 4	130	○	X	○	1.5	1.5	15	95	10
Comparative Example 5	130	◎	X	×	1.5	1.5	15	95	10
Comparative Example 6	130	×	5	○	1.5	1.5	15	80	10
Comparative Example 7	130	○	X	○	1.5	1.5	15	85	10
Comparative Example 8	115	×	4	○	1.4	1.5	20	95	5
Comparative Example 9	120	×	4	○	1.4	1.5	25	95	5
Comparative Example 10	140	◎	4	○	1.5	1.5	5	80	10

* Sensitivity: A portion of the paper is shown to the human eye as the number of measurements using McBeth's SpectroEye meter is larger.

* Shielding power: In a general office environment, the paper is placed on plain copy paper and visually determined to identify soft magnetic material or detection tag in the paper. (◎: excellent shielding power, ○: excellent shielding power, Δ: shielding power normal, x: poor shielding power)

* EM Sensitivity Sensitivity: Sensitivity is measured by passing the paper through an electromagnetic gate (manufactured by Korea CNC International, trade name: EM Visual Pro). The larger the value, the higher the sensitivity. X is not recognized at the gate.

* Metal Sensing Sensitivity: Checked using a metal detector (AD-2600S, manufactured by Doxcomm, USA)

* OD: Optical Density is measured with a McBeth SpectroEye meter in the USA, which printed black block images on an inkjet printer (EPSON stylus 915) and laser printer (Samsung Electronics CLP325) on paper. The larger the number, the sharper

* Ink Absorption: Rub the time after rubbing 3 times with 100g weight on black paper printed with EPSON stylus 915 printer. The smaller the number, the better the ink absorption

* Toner Fixability: 3M Magic Tape printed black block image on Samsung paper CLP325 printer, rub it 3 times with # 500g weight, and measure OD before and after OD / OD before evaluation * 100. The larger the value, the better the fixing

* TVOC emission amount: 50mg of paper was cut and concentrated using GC / MS at 200 ℃ for 5 minutes. The higher the value, the higher the emission of harmful substances.

As can be seen from the results of Table 7, the soft magnetic material satisfying the characteristic requirements of the residual magnetic flux density of 0.1T (Tesla) or more, the coercive force of 1 to 50 A / m, and the magnetic permeability of 500 to 100,000 H / m was used for the detector material layer. It can be seen that the paper of Examples 1 to 13 is easily detected in a detection system of an electromagnetic method and a metal detector. However, it can be seen that the papers of Comparative Examples 2 to 5, which did not satisfy the above characteristic requirements, cannot be used as papers for preventing document leakage due to low detection force.

The type of soft magnetic material used is also important in order to satisfy the above characteristic requirements, but characteristics such as thickness, length, and width are also very important. In the case of using a soft magnetic tag that is too thick to increase the detection power as in Comparative Example 6, irregularities are formed on the surface of the paper to reduce the shielding force and toner fixability. In addition, when the magnetic permeability is very high, as in Comparative Example 7, the ferromagnetic characteristics are exhibited, thereby reducing the reaction force in the electromagnetic detection system.

Conventional Comparative Example 1 (paper disclosed in Korean Laid-Open Patent Publication No. 2008-0107977) has an excellent detection ability of an electromagnetic method by inserting a tag for detection between sheets, but the image quality is not clear due to lack of white sensitivity, There is a problem that the amount of release of harmful substances relatively high, such as adhesive used when.

The shielding layer according to the present invention is also used to shield the soft magnetic material, but is also used for the purpose of improving printing aptitude in inkjet or laser printers. As can be seen from Comparative Example 8 and Comparative Example 9, there is a difference in the whiteness difference and the ink absorption of the paper depending on the presence or absence of the shielding layer. However, if an excessively large amount is applied on the detection substrate as in Comparative Example 10, it may be good for shielding the soft magnetic material, but the cost increases and the problem of inferior toner fixability occurs.

The present invention has been described above by way of example, and those skilled in the art will appreciate that various modifications may be made without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the spirit and scope of the present invention are not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all the technologies within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority under No. 119 (a) (35 USC § 119 (a)) of the US Patent Act No. 10-2013-0055433, filed with Korea on May 16, 2013. All content is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims

A detector material layer containing a detection material and integrally formed with the detection material and a printable substrate; And

A shielding layer formed on both sides of the detector material layer and shielding the detection material;

The detection material is a security recording medium, characterized in that the soft magnetic material having a residual magnetic flux density of 0.1T or more, coercive force of 1 ~ 50A / m, magnetic permeability of 500 ~ 100,000 H / m at a frequency of 10 Hz.
The method of claim 1,

And the printable substrate is paper or film.
The method of claim 1,

The recording medium for security further comprising an undercoat layer formed between the detector material layer and the shielding layer.
The method of claim 3, wherein

The undercoat layer contains at least one of a polyol resin, an acrylic resin, a polyurethane resin, or a vinyl resin, and the thickness of the undercoat layer is 0.1 to 5㎛ security recording medium.
The method of claim 1,

The soft magnetic material is at least one selected from the group consisting of Permalloy, Ferrite, Amorphous alloy, and Sendust.
The method of claim 1,

The detecting material is a tag having a thickness of 5 to 30 µm, a length of 1 to 10 cm, and a width of 0.5 to 2 mm, or a wire having a thickness of 1 to 15 µm, a length of 50 to 100 mm, and a width of 0.1 to 0.5 mm. Security record carrier.
The method of claim 1,

The thickness of the detector material layer is 50 ~ 150㎛, the recording medium for security, characterized in that the thickness of 5 ~ 30㎛.
The method of claim 1,

The shielding layer contains an inorganic material and a resin,

The inorganic material is at least one selected from the group consisting of clay, calcium carbonate, titanium dioxide, silica, alumina and talc, wherein the resin is at least one selected from the group consisting of latex, cellulose, polyvinyl alcohol and polyvinylpyrrolidone. Characterized by the recording medium for security.