JP2005325482A - Counterfeit-preventing form and method for discriminating genuineness or spuriousness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a counterfeit-preventing form to which one or more threads subjected to a cholesteric liquid crystal printing (CLC printing) treatment are added and whose genuineness or spuriousness can easily and surely be discriminated, and to provide a method for discriminating genuineness or spuriousness with the form. <P>SOLUTION: The counterfeit-preventing form 1 to whose base paper 2 threads 3a, 3b are added and disposed in parallel to each other is characterized by applying a color-changing CLC printing treatment to at least one of the threads, applying a conventional coloring printing treatment to another thread, or applying a left-handed circularly-polarized light CLC printing treatment to one of the two threads and right-handed circularly-polarized light CLC printing treatment to another, and then adding the two threads in parallel to the form so that the two threads pass intermittent exposed portions 6 disposed in the base paper and closed portions 7 between the exposed portions. The method for discriminating the genuineness or spuriousness comprises observing the thread 3 portions of the counterfeit-preventing form through a left or right-handed circularly-polarized light-selecting film for discrimination. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an anti-counterfeit paper provided by embedding a plurality of threads on a base paper and an authenticity determination method using the same.
The anti-counterfeit paper of the present invention relates to a technique for printing a woven thread using a cholesteric liquid crystal ink, and at least one of the threads is subjected to color variable printing having circular polarization selectivity using the liquid crystal ink. Include at least one other thread that is printed with a normal cholesteric liquid crystal ink with left circular polarization selectivity and right circular polarization selectivity. There is a case to do.

According to the authenticity determination method of the present invention, when the two thread surfaces of the anti-counterfeit paper are covered with a left circularly polarized light film or a right circularly polarized circularly selective film, a difference occurs in how they are seen. The present invention relates to a method for authenticating authentication.
Such threaded anti-counterfeit paper is used for authenticating genuine products such as printer consumables, electronic devices, computer products, pharmaceuticals, etc., and for guaranteeing luxury brand products such as watches, clothing, bags, jewelry, sports equipment, cosmetics, etc. It can be used for gift certificates, gift certificates, prepaid cards and other gold vouchers for IDs such as passports, driver's licenses and insurance cards.

As a measure for preventing counterfeiting of various security media, there is a method of embedding various threads on paper. Such anti-counterfeiting means using threads is provided at the stage of paper manufacture, so it is difficult to forge by methods such as color copying, scanner capture, and plate-making printing.
However, anti-counterfeiting paper that appears as if it has been threaded or imprinted with paper has also appeared, and using simple glitter threads or hologram threads has caused a problem that authentication cannot be performed at first glance. Yes.
Therefore, authenticity identifiers using anti-counterfeit paper that has a high degree of forgery difficulty and is easy to visually identify are also required for authentication media and voucher applications.

In order to solve this problem, in the present application, a cholesteric liquid crystal thread is drawn on a sheet, and related prior arts include the following.
Patent Document 1 relates to “anti-counterfeit paper and anti-counterfeit paper thread”, in which a plurality of threads are embedded in the base paper, but the characters or pattern patterns by normal colored printing are applied to the threads. . Although this technology is highly technically difficult due to the threading of the thread onto the base paper, in the field where it is actually used, an improperly forged product that simply attaches a forged thread that resembles a genuine thread is also genuine. There is a risk of being distributed as.

Patent Document 2 proposes a forgery-preventing paper in which a thread provided with cholesteric liquid crystal printing is incorporated with respect to “forgery-preventing thread and anti-counterfeit paper”. A tint block pattern is formed on the cholesteric liquid crystal layer by ordinary coloring printing. There may be a plurality of threads.
This technology is technical difficulty by embedding threads on the base paper, acquisition of materials using cholesteric liquid crystal, manufacturing difficulty, but liquid crystal printing disappeared when covered with a circularly polarized light selective film, It is difficult to know whether it is dark or invisible, and it is difficult to identify authenticity unless you get used to it. Even if the hologram is embossed, there is a color variable ink such as OVI (Optically Variable Ink) printing only by visual discrimination, and it is difficult to discriminate it from that.

JP 2000-290896 A JP 2004-53870 A

  Therefore, in the present invention, a thread printed with a cholesteric liquid crystal ink is used, and a thread formed by only ordinary colored printing is combined with the cholesteric liquid crystal printing thread in parallel, or left circular polarization and right circular polarization The present inventors have completed the present invention by studying that both threads of the sexual cholesteric liquid crystal printing thread are engraved in parallel to facilitate and ensure authenticity discrimination.

  The first of the gist of the present invention for solving the above problem is a forgery prevention paper provided by embedding a plurality of threads in parallel on a base paper, and at least one of the plurality of threads is included in the forgery prevention paper. Cholesteric liquid crystal printing that causes a color change is applied, at least one of the other threads is subjected to only normal colored printing, and the thread that is subjected to the cholesteric liquid crystal printing and the thread that is subjected only to normal colored printing The anti-counterfeit paper is characterized in that the two threads formed of are engraved in parallel so as to pass through the intermittent exposed portion provided on the base paper and the covering portion between the exposed portions. ,It is in.

  A second aspect of the present invention that solves the above-described problem is a forgery-preventing paper in which a plurality of threads are formed in parallel on a base paper, and at least one of the plurality of threads is included in the forgery prevention paper. Cholesteric liquid crystal printing having left circular polarization selectivity that causes a color change is performed, and at least one of the other threads is subjected to cholesteric liquid crystal printing having a right circular polarization selectivity that causes a color change. And two threads consisting of a thread subjected to right-circular polarization selective cholesteric liquid crystal printing are parallel so as to pass through an intermittent exposed portion provided on the base paper and a covering portion between the exposed portions And anti-counterfeit paper, which is characterized by being engraved.

  A third aspect of the gist of the present invention for solving the above-mentioned problem is a method for determining authenticity using a forgery-preventing paper according to claim 1, wherein the two thread portions are left-rounded at the exposed portion of the forgery-preventing paper. Observe with polarized or right circularly polarized circularly polarizing film, and in the case of cholesteric liquid crystal printing thread, part of characters or patterns appear to disappear due to either circular selective film, only normal colored printing The authenticity determining method is characterized in that the authenticity of the paper is determined based on the fact that the thread is invariant.

  A fourth aspect of the gist of the present invention for solving the above-mentioned problems is a method for determining authenticity using a forgery-preventing paper according to claim 2, wherein the two thread portions are placed on the left circle at the exposed portion of the forgery-preventing paper. By observing with polarized or right circularly polarized circularly selective film, and some of the letters or patterns of either left circularly polarized or right circularly polarized selective cholesteric liquid crystal printing threads appear to disappear An authenticity determining method characterized by determining authenticity of a sheet.

(1) In the anti-counterfeit paper according to claim 1, a cholesteric liquid crystal printing (hereinafter, also referred to as “CLC printing”) thread that changes in color depending on the viewing angle and a thread only for ordinary colored printing are covered with the exposed portion. Since the paper has been engraved in parallel, it is difficult to manufacture the paper itself, and the CLC printing thread changes in color even when the thread is visually observed. Easily distinguishable from prevention paper.
Further, it is possible to provide a forgery-preventing paper having higher security than that in which a normal colored printing thread is engraved.
(2) In the anti-counterfeit paper according to the second aspect, both threads are subjected to CLC printing in which a color change occurs depending on the viewing angle. However, the anti-counterfeit paper is composed of threads having left circular polarization selectivity and right circular polarization selectivity. In addition to difficulty in manufacturing itself, even when the thread is visually observed, different color changes occur between the left circularly polarized light selective and right circularly polarized light selective CLC printing threads. Easily distinguishable from paper.

(3) In the anti-counterfeit paper according to the third aspect, since characters or patterns are printed on the threads, it is possible to make it more difficult to imitate the anti-counterfeit paper.
(4) In the anti-counterfeit paper according to claim 4, the letters or patterns of the thread are engraved so as to be visible through the paper layer even in the covering portion, thereby improving the design of the anti-counterfeit paper, Moreover, imitation can be made more difficult.
(5) In the anti-counterfeit paper according to claim 5, since the CLC printing thread is black-printed on the background of the character or pattern, the transmitted light is absorbed to prevent reflection, so that the color change of cholesteric liquid crystal printing Can be easily recognized, and the accuracy of authenticity can be improved.
(6) In the anti-counterfeit paper according to the sixth aspect, the hologram pattern or the diffraction grating pattern is applied to both or one of the threads, so that it is more difficult to imitate the anti-counterfeit paper and the security can be improved.
(7) In the anti-counterfeit paper according to the seventh aspect, since the watermark pattern is provided between the threads or in the peripheral paper layer, it is more difficult to forge the anti-counterfeit paper and the anti-counterfeit property can be improved.

(8) In the authenticity discrimination method according to claim 8, when the CLC printing thread is used when either of the threads is covered using a circularly polarized light selective film of left circularly polarized light or right circularly polarized light, Since it is possible to observe a change in appearance in which a part of the character or pattern colored by the circularly polarized light selective film disappears, it is possible to easily and surely distinguish from a normal colored printing thread that does not cause such a change. it can.
(9) In the authentication method according to the ninth aspect, in the case of the right circularly polarized CLC printing thread, the left circularly polarized light or the right circularly polarized circularly polarized light selective film is used to cover both threads. A part of the character or pattern colored with the circularly polarized light selective film disappears, and in the case of the left circularly polarized CLC printing thread, an appearance change in which a part of the character or pattern colored with the right circularly polarized light selective film disappears can be observed. Therefore, it is possible to easily and surely determine the authenticity from only a normal colored printing thread in which such a change does not occur.

The anti-counterfeit paper of the present invention combines a thread that has been subjected to CLC printing and a thread only for ordinary colored printing, or a combination of both left and right circularly polarizing CLC printing threads. It is characterized in that a plurality of threads including them are drawn in parallel on the paper.
A cholesteric liquid crystal is a liquid crystal that has selective reflectivity of light and circular polarization selectivity depending on the viewing angle, and causes a color change. For printing, cholesteric liquid crystal pieces are finely pulverized using a pigmented ink. Alternatively, the liquid crystal resin itself may be applied to a medium and oriented and cured to form a liquid crystal coating film.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the anti-counterfeit paper according to the present invention, FIG. 2 is a plan view showing an example of combination of two threads of the first embodiment, and FIG. 3 is two diagrams of the second embodiment. FIG. 4 and FIG. 5 are diagrams showing the cross-sectional configuration of the thread, FIGS. 6 and 7 are diagrams for explaining the authenticity determination method of the present invention, and FIG. It is a figure which shows the state which engraves a paper.

1A and 1B are diagrams showing an embodiment of the anti-counterfeit paper of the present invention. FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view taken along line AA in FIG.
As shown in FIG. 1 (A), the anti-counterfeit paper 1 of the present invention is provided with the exposed portion 6 and the covering portion 7 alternately on the base paper 2, and the thread 3a passes through the exposing portion 6 and the covering portion 7. 3b are drawn in parallel. In the case of FIG. 1, only two threads 3 a and 3 b are illustrated, but two or more threads may be used.
As shown in FIG. 1B, the thread 3 a and the thread 3 b are exposed from the paper layer at the exposed portion 6, but the thread 3 is covered with the paper layer at the covering portion 7. Will not peel off. In the case of FIG. 1, the two threads 3 a and 3 b are engraved in the adjacent exposed portions 6 and the covering portions 7, but the two threads are exposed in a common exposed portion 6. You may do it.

The anti-counterfeit paper 1 of the present invention can be made into two types of embodiments.
In the first embodiment, it is assumed that, among the two adjacent threads 3a and 3b, for example, the thread 3a is subjected to CLC printing, and the thread 3b is subjected to only normal coloring printing. The cholesteric liquid crystal ink includes a left circularly polarized light and a right circularly polarized ink. In the first embodiment, any circularly polarized ink may be used.
The thread 3a needs to be CLC-printed for at least one color, but may be of mixed printing including normal colored printing.

  Two or more threads can be engraved, but even in that case, it is necessary that at least one thread has been subjected to CLC printing, and at least one other thread has undergone only normal color printing. As will be described later, characters or patterns are printed on each thread. Either or both of the CLC-printed thread or the colored-printed thread or both can be black printed. In that case, since the reflected light is absorbed and reflection is prevented, the color change can be confirmed more clearly.

  In the second embodiment, of the two adjacent threads 3a and 3b, for example, the thread 3a is subjected to left circular polarization selective CLC printing, and the thread 3b is subjected to right circular polarization selective CLC printing. Shall be. Each of the threads 3a and 3b needs to be CLC-printed for at least one color, but may be of mixed printing including normal colored printing. As in the case of the first embodiment, characters or patterns are printed on each thread and the background can be printed in black.

  Further, either or both of the threads may be provided with a hologram pattern or a diffraction grating pattern. This is because the brightness of the thread can be improved, and the thread itself and the forgery prevention paper can be more difficult to imitate.

In the covering portion 7, the threads 3a and 3b are in the paper layer, but are not completely buried and cannot be seen, but the paper on which the printing of characters or patterns applied to the thread through the paper layer is visible. It is preferable that the amount is covered with the material. This is because the appearance of characters or patterns applied to the threads 3a and 3b in the thin paper layer can also be a target for authenticity determination.
Moreover, it is preferable that the watermark character or the pattern 5 is provided in the paper layer between the threads or around the threads. In the case of FIG. 1, the watermark character “ABC” is inserted between threads, but it may be a large pattern across the threads. By providing the watermark character or pattern 5 on the anti-counterfeit paper as described above, it cannot be imitated by a method in which a forged thread resembling a thread is simply pasted, and it takes time to form a watermark pattern. This has the effect of reducing the willingness to counterfeit and tamper.

In FIG. 1, the exposed portion 6 and the covering portion 7 are characterized by appearing in the same state at the same position from the end of the sheet at the thread end with respect to the two threads 3a and 3b.
That is, both the thread 3a and the thread 3b are at the start end of the exposed portion 6 at the position x from the paper end, and are the start end of the covering portion 7 at the position y from the paper end. ing. Although not limited to such an embodiment, when the pitches at which the exposed portions 6 appear are the same and the positions are also adjacent to each other, it is possible to easily compare the threads and determine the authenticity. Convenient to.

FIG. 2 is a plan view showing a combination example of two threads according to the first embodiment, and shows a pattern example provided on two adjacent threads 3a and 3b.
The thread 3a in FIG. 2 (A) includes CLC printing, and the base is black-printed N1 with normal ink, and the character “DNP” is CLC-printed C1 with cholesteric liquid crystal ink on it. . The character looks green, for example, when viewed from the front.
On the other hand, the thread 3b shown in FIG. 2A has a black base print N1 printed with normal colored ink, and a red letter “DNP” printed thereon with a normal colored ink N2. The thread 3b is provided with a star-shaped hologram pattern H1. The black base printing N1 can prevent reflection and has an effect of making the hologram easy to see.
The base black print N1 may be provided immediately below the character pattern or the like, but the base black print is usually provided on the opposite side of the character pattern or the like through the base film.

The thread 3a in FIG. 2 (B) similarly includes CLC printing, and the base is black-printed N1 with normal ink, and when viewed from the front, for example, “DNP” that looks green The characters are CLC printed C1 with cholesteric liquid crystal ink. Furthermore, a star-shaped hologram pattern H1 is attached.
On the other hand, the thread 3b in FIG. 2B has a black base printing N1 with normal ink, and a red character print N2 of “DNP” with normal coloring ink thereon. Furthermore, a circular hologram pattern H2 is attached.

The thread 3a in FIG. 2 (C) similarly includes CLC printing. When the base is viewed from the front, for example, CLC printing C2 that looks green is formed on the entire surface, and a normal colored ink is used thereon. A red character print N2 of “DNP” is performed. In addition, although it does not appear in a top view, the black printing N1 by normal ink is made on the other side of the base film.
On the other hand, the thread 3b in FIG. 2C has yellow base printing N3 on the entire surface with normal ink, and colored black printing N1 with normal ink is performed on the opposite side of the base film. A black letter print N4 of “DNP” using normal colored ink is applied on the yellow base print N3, and a circular hologram pattern H2 is added.

The thread 3a in FIG. 2 (D) also includes CLC printing, and when the base is viewed from the front, for example, CLC printing C3 that looks red is formed on the entire surface, and on the opposite side of the base film The entire surface is black-printed with normal coloring ink N1. On the CLC print C3, a blue “DNP” character print N5 is made with a normal colored ink. Further, a star-shaped diffraction grating pattern K1 is attached.
On the other hand, the thread 3b shown in FIG. 2D has a green base print N6 formed on the entire surface with a normal color ink, and a black print N1 with a normal color ink on the opposite side of the base film. On the green base print N6, a red character print N2 of “DNP” is printed with a normal colored ink, and a circular diffraction grating pattern K2 is added.

  In CLC printing, a liquid crystal having a characteristic of selectively reflecting right polarized light or left polarized light having a specific wavelength is used as a cholesteric liquid crystal layer. Since the interference wavelength changes depending on the viewing angle, the color is not fixed but changes in color. Therefore, the expression of green and red for the CLC printing means the color when observed under certain conditions.

FIG. 3 is a plan view showing a combination example of two threads of the second embodiment, and similarly shows a pattern example provided on two adjacent threads 3a and 3b.
The thread 3a in FIG. 3A includes left-circular polarization CLC printing, and the background is colored black print N1 with normal ink, and the letters “DNP” and “L” are on the left circle. Polarized CLC printing CL1 is performed. The character looks green, for example, when viewed from the front.
On the other hand, the thread 3b in FIG. 3 (A) includes right circular polarization CLC printing, and the background is colored black printing N1 with normal ink, and “DNP” and “R” red letters on it. Is right circularly polarized CLC printing CR1. The thread 3b is provided with a star-shaped hologram pattern H1.
The printing method of the colored black printing N1 for the base may be the same as that in the first embodiment.

The thread 3a in FIG. 3B includes both left-circularly polarized light and right-circularly polarized CLC printing, and is colored black printed N1 with normal ink on the base, when viewed from the front. For example, the letter “DNP” that appears green is right-circularly polarized CLC print CR2, and the letter “L” that appears green is also left-circularly polarized CLC print CL1. Furthermore, a star-shaped hologram pattern H1 is attached.
On the other hand, the thread 3b in FIG. 3 (B) also includes both left circularly polarized light and right circularly polarized CLC printing, and is colored black printed N1 with normal ink on the base, and on the front thereof. When viewed, for example, the letter “DNP” that appears green is left-circularly polarized CLC print CL1, and the letter “R” that appears green is also right-circularly polarized CLC print CR2. Furthermore, a circular hologram pattern H2 is attached.

4 and 5 are views showing a cross-sectional configuration of the thread, and show only the first embodiment. FIG. 4 (Aa) is a cross-sectional view of the thread 3a of FIG. 2 (A). The thread 3a has a colored black print N1 with a normal colored ink on the entire back side of the base film 31 and a character print C1 by CLC printing on the front side.
4A is a cross-sectional view of the thread 3b of FIG. The thread 3b is provided with a hologram forming layer H1 on the back side of the base film 31, and colored black printing N1 with a normal colored ink is applied to the entire surface through a transparent vapor deposition layer T1 on the lower surface thereof. On the surface side of the base film 31, a red character coloring printing N <b> 2 is usually performed with ink.

FIG. 4 (Ba) is a cross-sectional view of the thread 3a of FIG. 2 (B). The thread 3a is printed on the entire back surface of the base film 31 with a colored black print N1 using a normal coloring ink via the hologram forming layer H1 and the transparent vapor-deposited layer T1. Green character printing C1 is performed by printing.
Note that the cross section of the thread 3b in FIG. 2B appears in the same manner as in FIG. 4A.

FIG. 5 (Ca) is a cross-sectional view of the thread 3a of FIG. 2 (C). The thread 3a is printed on the entire back surface of the base film 31 with a colored black print N1 with a normal colored ink, and on the front side with a green entire colored layer C2 with a CLC print, and a red color with a normal colored ink print. Character printing N2 is performed.
FIG. 5Cb is a cross-sectional view of the thread 3b in FIG. The thread 3b is printed on the back side of the base film 31 with the black color printing N1 using normal ink on the entire surface through the hologram forming layer H2 and the transparent vapor-deposited layer T1. Through this, black character printing N4 is performed with normal colored ink.

FIG. 5 (Da) is a cross-sectional view of the thread 3a of FIG. 2 (D). The thread 3a is printed on the back side of the base film 31 with a colored black print N1 using a normal colored ink through the diffraction grating forming layer K1 and the transparent vapor-deposited layer T1, and on the surface side a red colored layer C3 by CLC printing. Through this, blue character printing N5 is performed with a normal colored ink.
Note that a cross section of the thread 3b in FIG. 2D appears in the same manner as in FIG. However, the hologram forming layer H2 is replaced with the diffraction grating forming layer K2. Although both the hologram forming layer and the diffraction grating forming layer are thin resin layers, the hologram forming layer is an interference fringe plane of light from two directions, whereas the diffraction grating forming layer is formed of parallel or waved diffraction grating surfaces.

  Although the cross-sectional view of the thread according to the second embodiment is not shown, it is easy to analogize that the same is true because it is only a difference in circular polarization.

Next, the authentication method of the present invention will be described. FIG. 6 is a diagram for explaining the authenticity discrimination method, and shows a state in which the anti-counterfeit paper 1 of FIG.
FIG. 6A shows the anti-counterfeit paper 1 of the first embodiment of FIG. 1, but the discrimination film 4 is used for the threads 3 a and 3 b of the exposed portion 6. The discrimination film 4 is placed so as to be in contact with the surfaces of the threads 3a and 3b or held at a slight distance, and the threads 3a and 3b are observed so as to gradually rotate in parallel. The discriminating film 4 is a film having a circularly polarized light selectivity and having a right circularly polarized light or a left circularly polarized light. Although it is semi-transparent in appearance, there is a characteristic that reflected light from the liquid crystal layer (CLC printing layer) is blocked or transmitted by the circular polarizing film depending on the direction of the circularly polarized light of the cholesteric liquid crystal layer.

For example, if the CLC print pattern that is a cholesteric liquid crystal layer is discriminated by right-handed circularly polarized light (circularly polarized light) and the film 4 is also right-handed circularly polarized light, the reflected light is discriminated through the film 4 (circularly polarized light) and the CLC printed pattern is The presenting color can be observed. On the contrary, if the discriminating (circularly polarized light) film 4 is left circularly polarized light, the reflected light that is right circularly polarized light is blocked by the discriminating (circularly polarized light) film 4, and the color of the CLC print pattern disappears at a certain angular position. .
Therefore, in the case of the first embodiment, when it is specified whether the CLC print layer is left circularly polarized light or right circularly polarized light, the reflected light of the CLC printed portion is obtained by using a discriminating film having a characteristic opposite to that of the circularly polarized light. If both discriminating films 4 are used in sequence, the characters or patterns of CLC printing disappear on either discriminating film. Case and true / false can be distinguished.

FIG. 6B shows patterns provided in the threads 3a and 3b, and the same pattern as the threads 3a and 3b shown in FIG. 2B is shown.
FIG. 6C shows the state of the thread 3a and the thread 3b viewed with the discrimination film 4 placed thereon. In the case of the thread 3a, the green character print C1 of “DNP” by CLC printing disappears. It is buried in a black base and cannot be observed. This is because the discrimination film 4 blocks the reflected light of green letters. In this case, since the base is black, the whole is black, but only the brightness of the hologram pattern H1 can be observed.
On the other hand, since the character N2 of the thread 3b is composed of only ordinary colored ink, the reflected light is somewhat weakened, but no substantial change in the pattern shape occurs.

The thread 3a in FIG. 2A also appears in the same manner as in FIG. 2B, but there is a difference that there is no hologram pattern H1. The thread 3a in FIG. 2C has the red character print N2 with normal ink in the green CLC full surface print C2, so that the normal print red character N2 is in black with the green reflected light blocked. Will appear. In the thread 3a in FIG. 2D, the blue character N5 appears in the black color from which the red CLC solid printing is blocked because the blue character N5 by the normal colored ink is present in the red CLC print C3. become. All of the threads 3b can be seen with almost no change.
In the anti-counterfeit paper of the present invention, since the character or pattern of the thread can be seen through the paper layer also in the covering portion 7, it is possible to determine the authenticity in the same manner using the determination film 4, A similar situation is observed although the sharpness is somewhat different.

FIG. 7 is also a diagram for explaining the authenticity determination method, and shows a case where the forgery prevention sheet is the second embodiment. FIG. 7 shows a pattern example of the threads 3a and 3b in FIG.
FIG. 7A shows the state of the thread 3a and the thread 3b in FIG. 3B when the right circular polarization discriminating film 4R is placed and seen through. In the case of the thread 3a, the green character print CR2 of “DNP” by right circular polarization CLC printing can be observed through the discrimination film 4R, but the green character print CL1 of left circular polarization “L” disappears and becomes a black background. It is buried and can no longer be observed. This is because the discriminating film 4R has the right circular polarization selectivity, so that the left circular polarization green “L” character print CL1 is blocked. In this case, since the base is black, only the brightness of the green letter print CR2 of “DNP” and the hologram pattern H1 can be observed. In the case of the thread 3b, the green character print CL1 of “DNP” by left circular polarization CLC printing disappears, but the green character print CR2 of right circular polarization “R” is in an observable state.

FIG. 7B shows the state of the thread 3a and the thread 3b in FIG. 3B when the left circular polarization discriminating film 4L is placed and seen through. In the case of the thread 3a, the green character print CR2 of “DNP” by the right circular polarization CLC print disappears, but the green character print CL1 of the left circular polarization CLC print “L” is in an observable state. This is because the discriminating film 4L has left-circular polarization selectivity, and thus cuts off the right circularly-polarized green “DNP” character print CR2.
In the case of the thread 3b, the green character print CL1 of “DNP” by the left circular polarization CLC printing can be seen, but the green character print CR2 of “R” has disappeared.

The thread 3a and thread 3b in FIG. 3A are not shown, but the thread 3a is green with left circular polarization and has the character print CL1 of “DNP” and “L”. In the film 4L, the character prints CL1 of “DNP” and “L” can be observed, and it is obvious that the entire film disappears in the right circular polarization discriminating film 4R. In the thread 3b, the opposite result is obtained.
In this way, the right circular polarization discriminating film 4R can be seen as “R”, and the left circular polarization discriminating film 4L can be seen as “L” so that the authenticity can be easily determined. .

As the discriminating film 4, a polymer film having a transparent cholesteric liquid crystal alignment fixed and showing left or right circularly polarized light selectivity is used. Examples of such a polymer film include a cholesteric alignment of a specific low-molecular liquid crystal, followed by cross-linking by photoreaction or thermal reaction, and a thermotropic polymer liquid crystal in a liquid crystal state. Then, the polymer film prepared by cooling to a temperature below the liquid crystal transition point and fixing the alignment state can be given. In either case, a material exhibiting a specific circular polarization selectivity is used.
A thin film having a uniform thickness is preferable. For film formation, a dip coating method, a cast film forming method, a spin coating method, a die coating method, or the like is employed.

Since the authenticity determination method of the present invention uses the above characteristics of the anti-counterfeit paper 1, it is possible to easily determine authenticity from a thread composed only of ordinary colored printing.
Cholesteric liquid crystal ink is difficult to obtain as a material, and in general, it is difficult to produce a CLC printing thread. In addition, it is difficult and costly to imitate both threads with normal colored ink. Further, since the discrimination film 4 itself is difficult to obtain, there is an advantage that it is not generally known how to discriminate.

Next, the manufacturing method of the forgery prevention paper of this invention is demonstrated.
The anti-counterfeit paper having the structure of the present invention is provided with a small convex portion having the same width as or wider than the thread on one paper net of the multi-cylinder paper machine, and the thread is placed on the convex portion. It can be manufactured by supplying the stock liquid in a state. That is, in this way, the covering portion is formed because the thread is sandwiched by the stock liquid at the position where there is no convex portion, and the exposed portion is exposed from the lower surface side of the stock liquid at the convex portion position. It is formed.
Alternatively, by using a multi-tank type round net paper machine, the exposed portion can be provided in a portion where the stock does not adhere by partially closing the mesh of the round net with tape. However, the following is an explanation of the former method.

FIG. 8 is a diagram showing a state in which the threaded forgery prevention paper is drawn. 8A is a cross section parallel to the thread, FIG. 8B is a cross section taken along the line CC in FIG. 8A and perpendicular to the thread, and FIG. 8C is a cross section taken along the line DD. Is shown.
As shown in the figure, this threaded anti-counterfeit paper is provided with projections 9a having a width equal to or wider than that of the threads 3 on the meshing portion 9 of the paper machine at appropriate intervals. It can be manufactured by supplying the stock liquid 2a with the thread 3 placed on the top.
That is, in this way, the thread 3 is sandwiched between the paper material liquid 2a at the position between the convex part 9a and the convex part 9a of the perforated net part, so that the covering part 7 is formed, and at the position of the convex part 9a, the thread 3 Is the lowermost surface, and when the paper is peeled off from the plow net of the paper machine, the thread 3 appears on the surface and the exposed portion 6 is formed.

  When the convex portion 9a of the perforated net portion is made the same width as the thread 3 as shown in FIG. 8D, the watermark portion does not enter on both sides of the thread 3. In addition, when the width is set so as to straddle the thread, a watermark portion is inserted to enhance the decorative effect, and the blurring of the thread can be absorbed as described above. Further, when the watermark character or pattern 5 is provided between or around a plurality of threads, a character or pattern-like convex portion may be formed on the perforated net portion in the same manner as the convex portion 9a.

The thread 3 has a feature in which the character or pattern is embedded in the base paper in the covering portion 7 with a thin paper material that can be seen through the paper layer.
Usually, the anti-falsification paper, 104 g / m ² about the paper is used, a thin if the stock side 35 g / m ² approximately, it is possible to determine or to fully observe the pattern on the thread. Even if the thick paper side is about 70 g / m ² , the letters or patterns on the thread can be observed or discriminated although the clarity is inferior.

Next, a method for producing the thread used in the present invention will be outlined.
<Print thread>
Both those based on CLC printing and those based on normal colored ink printing belong to the category of printing threads. The print thread 3 is a thread that is cut into a narrow width after printing on the front or back surface of a plastic film or a glittering film with base printing, printing of characters or patterns.
For printing, gravure, offset, silk screen printing, and the like are performed. In the case where printing is performed on a continuous wound film in a continuous process, rotogravure, offset rotation, and rot silkscreen printing are preferably performed. The printing ink to be used is not particularly limited as long as it has water resistance in the paper making process and anti-counterfeiting paper for a variety of purposes, and has some heat resistance. Either a dye system or a dye system may be used. Cholesteric liquid crystal inks also satisfy these required characteristics.

<Hologram printing thread>
A thread formed by printing on a film having a hologram is characterized by a combined anti-counterfeiting effect due to hologram and printing. There are various embodiments of the printing holo thread. As shown in FIGS. 4 and 5, after coloring printing C1, N2 or the like is printed on one surface of the base film 31, the hologram forming layer H1 is printed on the other surface. And a transparent vapor deposition layer T1 is further provided on the hologram layer. The hologram forming layer H1 may be provided before the front side CLC printing or the normal colored printing C1, N2. In the case of this embodiment, since the transparent vapor deposition layer T1 is provided on the entire surface, the glitter of the thread becomes high.

The hologram thread refers to a thread having a hologram (or light diffraction grating) pattern on the front surface or the back surface of the thread. The hologram forming layer (or may be an optical diffraction grating forming layer) provided on the base film is applied in another step after a hologram forming layer such as an ultraviolet curable resin composition is applied on the base film. Hologram exposure is performed on the resist resin, and the hologram mold plate patterned by etching is nickel-plated, and the hologram mold plate produced by copying the hologram microemboss on the plating surface is pressed to duplicate the hologram. In the case of an ultraviolet curable resin, the coating resin taken as a hologram is irradiated with ultraviolet rays to be cured. The same process is performed for the diffraction grating pattern.
In Ab and Ba of FIG. 4 and Cb and Da of FIG. 5, the waveforms in the hologram forming layer and the diffraction grating forming layer mean hologram interference fringes and the like taken from the template. In a continuous process, the hologram type plate is formed in a roll shape.

  In addition, as an ultraviolet curable resin composition, the composition etc. which added the sensitizer to what mixed the unsaturated ethylene monomer and the unsaturated ethylene oligomer suitably are used. Hologram layer formation can also be performed in steps other than photocuring. In this case, thermoplastic resins such as acrylic resin, polystyrene resin, and polycarbonate, and thermosetting resins such as melamine resin, epoxy resin, and urethane resin are also used. . The hologram forming layer itself is usually formed to a thickness of 5 μm or less. Such a thread having a hologram pattern or a light diffraction grating pattern is difficult to replicate, and thus can be said to have a higher anti-counterfeit effect.

As a material of the transparent vapor deposition layer, a transparent material having a refractive index different from that of the hologram forming resin layer, a metal thin film layer, or the like is used. Examples of the transparent continuous thin film having a refractive index larger than that of the resin layer include Sb ₂ S ₃ , ZnS, and TiO ₂ . A thin film forming method such as a vacuum evaporation method or a sputtering method is used to form these reflective layers.

  As the base film, for example, a polyester film including a polyethylene terephthalate film, a polystyrene film, a polypropylene film, a polysulfone film, a polyphenylene sulfide film, a polycarbonate film, a cellulose resin film, and metal deposition was performed on these various resin films. In addition to films, capacitor paper, aluminum foil films, or laminated films with aluminum foil can be used. The thickness of the base film is 4 to 200 μm, and a thin base is preferable in order to prevent unevenness in the engraved portion, and a thickness of 8 to 50 μm can be recommended.

  The threads 3a and 3b in FIG. 2B described above process the hologram forming layer H1 on the base film 31, and then form the transparent vapor deposition layer T1 on the hologram layer, and further, the transparent vapor deposition layer T1. This is a form in which the colored printing N1 is provided on the back. In the case of this embodiment, since the transparent vapor deposition layer T1 is provided, the hologram forming layer H1 produces diffracted light of light, and also has an effect of allowing the transparent print layer to pass through and observing the lower print layer.

  In addition, when making each said thread | thread, what equips the back surface with the contact bonding layer which consists of a water-soluble binder etc. of heat melting temperature 60-80 degreeC can be used. With this configuration, the thread 3 adheres to the base paper 2 in a state in which the anti-counterfeit paper is completed, so that the adhesion between the base paper 2 and the thread 3 is improved.

First, the threads 3a and 3b shown in FIG.
<Preparation of printing holo thread (thread 3b)>
As a base film 31 of the thread, a pattern made of a combination of lower case letters “DNP” by gravure printing on a transparent polyethylene terephthalate film (“Lumirror S-28” manufactured by Toray Industries, Inc.) having a thickness of 16 μm is printed with red gravure ink (Z -It printed by surface printing using the ink tech Co., Ltd. product (a vinyl chloride resin type | system | group).

  Next, a hologram forming material was applied to the surface of the base film 31 opposite to the red printing, and heat embossing was performed to form a concavo-convex pattern (hologram forming layer H1) of the hologram. Then, the transparent vapor deposition layer T1 of titanium oxide was formed on it, and also the black printing N1 of the whole surface was performed with normal black gravure ink on it. Then, using a slitter machine, it was shredded to a width of 2 mm to obtain a thread 3b.

<Preparation of CLC printing holo thread (thread 3a)>
As a thread base film 31, a transparent polyethylene terephthalate film with a thickness of 16 μm (“Lumirror S-28” manufactured by Toray Industries, Inc.) is subjected to gravure printing with a pattern consisting of a combination of lowercase letters “DNP” and a letter “L”. CLC print C1 was printed using a green cholesteric liquid crystal ink. As the ink, an ink in which a cholesteric liquid crystal pigment (left circular polarization) was dispersed was used. Next, a hologram forming material was applied to the surface of the base film 31 opposite to the CLC printing, and hot embossing was performed to form a concavo-convex pattern (hologram forming layer H1) of the hologram. Then, the transparent vapor deposition layer T1 of titanium oxide was formed on it, and also the black printing N1 of the whole surface was performed with normal black gravure ink on it. Then, using a slitter machine, it was shredded to a width of 2 mm to obtain a thread 3a.

Each hologram pattern was formed by applying an ultraviolet curable acrylic resin (“Iupimer LZ065S” manufactured by Mitsubishi Chemical Corporation) to 1.5 g / m ² on the base film 31 by the gravure reverse coating method. After processing, the hologram pattern mold was heat embossed to copy the pattern, and then irradiated with ultraviolet rays so that the concavo-convex pattern of the hologram could be completely retained. Thereafter, a transparent vapor deposition layer T1 was formed to a thickness of 450 mm on the hologram forming layer H1 using titanium oxide (TiO ₂ ).

<Making of anti-counterfeit paper>
As shown in FIG. 1, the exposed portion 6 is repeated with a pitch of 10 mm × width of 15 mm, and the covering portion 7 is repeated with a pitch of 10 mm, so that two of each of the thread 3a and the thread 3b manufactured as described above appear on the anti-counterfeit paper as shown in FIG. The paper was machined on high-quality paper of 90 kg / sixty-six with a paper machine with a net pattern. Incidentally, the upper part of the stock of the cover portion 7 is 35 g / m ^2, the lower part of the stock of the covering portion has adjusting the height of the convex portion of the network part paper making such that the 69 g / m ^2. The anti-counterfeit paper thus completed was able to identify the lowercase letters “DNP” even in the covering portion, and the print holo thread was shining in the exposed portion.
Further, when the threads 3a and 3b of the anti-counterfeit paper were observed using the right circular polarization discriminating film 4R, the characters of the threads 3a disappeared and the change state could be clearly confirmed.

It is a figure which shows embodiment of the forgery prevention paper of this invention. It is a top view which shows the example of a combination of two thread | sleds of 1st Embodiment. It is a top view which shows the example of a combination of two thread | sleds of 2nd Embodiment. It is a figure which shows the cross-sectional structure of a thread | sled. It is a figure which shows the cross-sectional structure of a thread | sled. It is a figure explaining the authenticity discrimination method of this invention. It is a figure explaining the authenticity discrimination method of this invention. It is a figure which shows the state which engraves the forgery prevention paper containing a thread.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Counterfeit prevention paper 2 Base paper 2a Paper liquid 3,3a, 3b Thread 4 Discriminating film 4L Left circularly polarized light discriminating film 4R Right circularly polarized light discriminating film 5 Water mark character or pattern 6 Expressing part 7 Covering part 8 Water mark part 9 Peeling net Part 9a convex part 31 of perforated net part base film C1, C2, C3 CLC printing N1, N2, N3, N4, N5, N6 Normal colored printing H1, H2 hologram pattern, hologram forming layer K1, K2 diffraction grating pattern, Diffraction grating formation layer T1 Transparent vapor deposition layer

Claims (9)

A forgery-preventing paper provided by embedding a plurality of threads in parallel on a base paper, at least one of the plurality of threads being subjected to cholesteric liquid crystal printing that causes a color change, and other threads At least one of these is subjected only to normal coloring printing, and two threads comprising a thread subjected to the cholesteric liquid crystal printing and a thread subjected only to the normal coloring printing are provided on the base paper. An anti-counterfeit paper characterized in that the paper is drawn in parallel so as to pass through an intermittent exposed portion and a covering portion between the exposed portions. A forgery-preventing paper in which a plurality of threads are formed in parallel on a base paper, and at least one of the plurality of threads has cholesteric liquid crystal printing having a left circular polarization selectivity that causes a color change. And at least one of the other threads is subjected to cholesteric liquid crystal printing having right circular polarization selectivity that causes a color change, and subjected to cholesteric liquid crystal printing of the left circular polarization selectivity and right circular polarization selectivity. Forgery characterized in that the two threads, each of which is made up of a single thread, are engraved in parallel so as to pass through the intermittent exposed portion provided on the base paper and the covering portion between the exposed portions Prevention paper. The forgery prevention paper according to claim 1 or 2, wherein characters or patterns are printed on the two threads. The forgery-preventing paper according to claim 3, wherein the characters or patterns of the two threads are formed on the base paper with a paper material that can be seen through the paper layer even in the covering portion. The anti-counterfeit paper according to any one of claims 1 to 3, wherein the thread subjected to the cholesteric liquid crystal printing is black-printed on a base of the cholesteric liquid crystal printing. The anti-counterfeit paper according to any one of claims 1 to 3, wherein the thread is provided with a hologram pattern or a diffraction grating pattern. 3. The forgery prevention paper according to claim 1, wherein a watermark character or a pattern is provided on a paper layer between or around the plurality of threads. The authenticity determination method using the anti-counterfeit paper according to claim 1, wherein the two thread portions are formed using a left circularly polarized light or a right circularly polarized circularly-polarized selective film at the exposed portion of the anti-counterfeit paper. Observe that in the case of a cholesteric liquid crystal printing thread, some of the circle-selective film appears to lose part of the character or pattern, and in the case of a thread with only colored printing, it remains unchanged. A method for determining authenticity, characterized by determining sex. 3. A method for determining authenticity using an anti-counterfeit paper according to claim 2, wherein the two thread portions are formed using a left circularly polarized light or a right circularly polarized circularly polarized light selective film at the exposed portion of the anti-counterfeit paper. Observe and identify authenticity of paper by discriminating the authenticity of the paper by observing and disappearing part of the letters or patterns of either left circularly polarized light or right circularly polarized light selective cholesteric liquid crystal printing thread Method.

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