JP2000256994A - Windowed thread paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce windowed thread paper having nonconventional counterfeit- preventing effect. SOLUTION: In the windowed thread paper inserted in which the thread 1 is intermittently exposed in the surface of a form, the breadth of the thread is set to have 1.8-5 mm and the surface of the thread on the side exposed in outlook windows 2 is made not to substantially adhere to paper layers constituting tunnels 3. Since the paper layer is easily cut and removed by rubbing the tunnels with a nail or the like and the thread is exposed, it is possible to easily distinguish the true of the form from the false.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window-threaded paper. For details, forgery prevention is based on whether the paper layer peels off by physically rubbing the part (tunnel part) where the thread intermittently sneaks into the paper in the anti-counterfeit printed matter manufactured using the paper with window-thread. The present invention relates to a window-threaded paper having the characteristic that the authenticity of a prevention printed matter can be determined.

[0002]

2. Description of the Related Art Forgery prevention paper called "threaded paper" in which threads are inserted in a paper layer is well known.
As a typical example of the thread, a film which has been subjected to various processes as described later in detail is slit into a narrow width. Since the paper into which these are made requires extremely advanced technology for production, it is very effective in preventing forgery, and is widely used for banknotes and the like in various countries.

There are roughly two types of threaded paper. One is a type in which the thread is inserted inside the paper and is not exposed on the surface of the paper, and the other is `` window-opening threaded paper '' in which a part of the thread is exposed in a window provided on the surface of the paper. It is called.

[0004] As a method of manufacturing the latter "paper with a window thread", a belt mechanism having a groove formed by threading a thread at the tip of a convex portion of a guide having an uneven portion is embedded in a stock suspension on a wire. Manufacturing method (Japanese Patent Publication 5-8568)
No. 0) or a method in which a thread processed into an uneven shape is used as an upper net of a circular paper machine, and a thread is inserted into a window opening portion by inserting a thread while making contact with the uneven portion of the net surface (US Patent No. No. 4462866) or a pressurized air nozzle is built in a rotary drum on a wire of a fourdrinier paper machine, and the slurry on a thread inserted in advance into a web is intermittently blown off with compressed air to expose the thread to the paper surface. Method (Japanese Unexamined Patent Publication
272200) and the like.

The inventors of the present invention have also disclosed Japanese Patent Application No. Hei 8-13524.
No. 4 proposed a method of manufacturing a forgery prevention paper made of a combined paper in which a thread is exposed at a window opening provided on the surface of the paper and characters or images are provided in the window opening. Specifically, when producing a combined paper comprising at least two layers of the outermost paper layer and the other paper layer using a multi-tank type circular-mesh paper machine, the first tank is used to manufacture the paper other than the outermost layer. A paper layer is formed, and an outermost paper layer having a window opening intermittently in a flow direction of the paper layer in the second tank and having a cut-in made of characters or images in the window opening is provided. Immediately before superimposing the outermost paper layer formed in the second tank on the paper layer formed in the first tank, the thread is interposed between the paper layers so as to be located at the window opening of the outermost paper layer. How to insert.

On the other hand, anti-counterfeit paper in which a metal deposition layer, a hologram layer, a rainbow layer and the like are partially transferred to the surface of a paper using a transfer foil, and forgery in which these layers are partially transferred to the surface of a printed material Prevention prints are also widely known. As an example of the transfer foil, for example, in the case of a metal vapor-deposited transfer foil, a resin layer that also serves as a protective layer and a release layer is formed on a polyester film, and a metal vapor-deposited layer of aluminum or the like is formed on this resin layer, and further thereon. A heat-sensitive adhesive layer is formed on the substrate. When this is transferred to paper, the heat-sensitive adhesive layer is brought into contact with the paper, and then the hot plate on which the pattern is formed is pressed. Then, the heat-sensitive adhesive layer partially melts and adheres to the paper according to the design. When the foil is peeled off, only the portion corresponding to the pattern is peeled off from the film, and the pattern having metallic luster is transferred to the paper.

In the case of a hologram transfer foil, a hologram emboss is applied to the resin layer. In the case of a rainbow transfer foil, an interference layer is formed instead of the resin layer. These transfer foils are widely used in anti-counterfeit papers and anti-counterfeit prints.For example, hologram transfer foil is used for Australian banknotes, rainbow transfer foil is used for Canadian banknotes, and French banknotes are used for banknotes. Parallelogram shape (length 10mm, width 3mm, angle of short side to long side 45
Forgery prevention means in which the transfer of the metal-deposited foil in step (d) is repeated at intervals of 10 mm is employed.

When a small rectangular pattern is continuously transferred to the paper surface using a transfer foil, for example, with a width of 1.2 mm, a length of 10 mm, and an interval of 5 mm, the appearance is similar to that of a paper with a window-open thread. It becomes a very similar anti-counterfeit paper. However, when the paper is held up over light, it can be clearly distinguished between the paper with the window thread and the foil transfer paper. That is, in the case of paper with a window thread, since the thread also exists in the tunnel portion in a buried form, when the paper is held over light, this portion is darker than the portion where no thread exists, so It can be confirmed that the paper has a window-opening thread. On the other hand, in the case of the foil transfer paper, light is transmitted between the rectangles (corresponding to the tunnel portion of the paper with the window opening thread), so that the foil transfer paper can be immediately confirmed.

As can be seen from the above description, in the case of foil transfer paper, if a "transfer foil" and a "foil stamping machine" are available, counterfeiting can be performed relatively easily, so that the production is extremely advanced. It is said that the anti-counterfeiting ability is considerably inferior to that of window-threaded paper that requires technology. Therefore, in the case of the foil transfer paper, the width is about 10 mm, which is much wider than that of the thread, and a special shape (example of the above-mentioned French banknote) is adopted. Forgery prevention is being carried out.

[0010]

As described above, as forgery prevention papers used for forgery prevention printed materials, there is a demand for papers that always employ advanced and new forgery prevention technology. In view of such a background, an object of the present invention is to develop a window threaded paper that employs advanced and new forgery prevention technology.

[0011]

Generally, an adhesive is applied to a thread used for a paper containing a window-thread. In addition, it is necessary that the adhesive layer is always provided on the surface opposite to the surface exposed to the window opening (the surface in contact with the paper layer without any modification). If the adhesive is not applied, the thread exposed on the window opening will not be bonded in the paper layer, and the thread exposed on the window opening can be easily pulled out by pinching and preventing forgery The effect is a fatal drawback, and the quality is significantly degraded.

It has been said that it is preferable that the window-threaded paper is coated with an adhesive on the side exposed on the window opening. In particular, when the width of the thread becomes wider,
This is because the paper layer forming the tunnel portion and the thread surface do not adhere firmly, and it is expected that the fibers will fall off during offset printing, leading to a problem of contaminating the blanket. The inventors of the present invention have studied variously changing the width of the thread, and as a result, have found that if the width of the thread exceeds 5 mm, this trouble increases during printing and becomes a practical problem.

On the other hand, the present inventors, in the course of the above examination, when the width of the thread exceeds 1.8 mm, a phenomenon occurs in which the paper layer at the portion where the thread comes into contact is easily peeled off by physically rubbing the tunnel portion. I found something.

The present inventors have thought that, by skillfully utilizing these phenomena, it is possible to manufacture paper with a window thread having an unprecedented unique effect, and have completed the present invention. That is, the gist of the present invention will be described with reference to the drawings.
Is exposed, the width of the thread is 1.8 to 5 mm, and the surface of the thread exposed on the window opening portion 2 and the paper layer forming the tunnel portion 3 are substantially formed. A window-opening threaded paper characterized in that it is not adhesively bonded.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In producing the paper with a window thread according to the present invention, a stock is first prepared. The preparation of the stock is appropriately performed using wood pulp such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulphite pulp (NBSP), and non-wood pulp made from hemp, cotton, or straw. Mix and beat, then add the filler,
Dry paper strength agent, wet paper strength agent, sizing agent, fixing agent,
Retention improvers, drainage improvers, defoamers, dyes, coloring pigments, fluorescent agents, etc. are appropriately added, and usually a freeness of 400 to
250 ml C.I. S. F. Adjust to

Although any method may be used for producing the "windowed threaded paper", a few examples include a guide having irregularities in the stock suspension on the wire as described above. Manufacturing method by burying a belt mechanism having a groove through a thread at the tip of a convex portion (Japanese Patent Publication No. 5-85)
No. 680), and a method in which a thread processed into an uneven shape is used as an upper net of a round paper machine, and a thread is inserted into a window opening portion by inserting a thread while making contact with the uneven portion of the net surface (US Patent No. No. 4,462,866) or a method in which a compressed air nozzle is built in a rotary drum on a wire of a fourdrinier paper machine, and a slurry on a thread inserted in advance into a paper web is intermittently blown off with compressed air to expose the thread. Kaihei 6-272
No. 200).

Further, the present inventors have disclosed in Japanese Patent Application No. Hei 8-13524.
In the method as proposed in No. 4, that is, when a laminated paper consisting of at least two layers of the outermost paper layer and the other paper layer is manufactured using a multi-tank type circular paper machine, the first method is used. Forming a paper layer other than the outermost layer in a tank, forming an outermost paper layer having a window intermittently in the flow direction of the paper layer in a second tank, and forming a paper layer in the first tank; Immediately before superposing the outermost paper layer formed in the second tank, a method may be employed in which a thread is inserted between the paper layers so as to be located at the window opening of the outermost paper layer.

Hereinafter, this manufacturing example will be described with reference to FIGS. FIG. 3 is an explanatory view showing an example of a round paper machine that can be used for producing the window-threaded paper of the present invention, and FIG. It is a partial explanatory view showing a state where a mold for forming a part is attached. Upper net 12 of the cylinder 12a
In FIG. 4B, a mold 13 corresponding to a window opening made of metal, resin, paper or the like as shown in FIG. 4 is attached with a thin metal wire, soldered, or attached with an adhesive. The shape of the mold 13 corresponding to the window opening may be any shape other than a rectangle, such as a square, a rhombus, a circle, an ellipse, and the like.

When attaching the mold 13 to the upper net of the net cylinder of the tank 12 for forming the outermost paper layer, the arrow W
The length X corresponding to the window opening 2 in the flow direction of the paper layer (the longitudinal direction of the paper), and the tunnel portion (non-window opening) 3 located between the window openings. It is desirable to mount the mold intermittently at an interval such that the ratio to the length of the mold becomes 3: 1 to 1: 2. By setting the ratio of the window opening portion to this range, the effect of preventing wrinkles from occurring when the paper is continuously wound into a roll is reliably achieved.

The upper net 11a without any work is attached to the cylinders of the case 11 other than the case 12 forming the outermost layer. The paper layer made by the mesh cylinder equipped with the upper net 11a without any work is transferred to the blanket 14, transported onto the mesh cylinder equipped with the mold 13, and the outermost layer made by this mesh cylinder is formed. A layer of paper is stacked on top of it,
A paper in which two paper layers are combined is produced. The insertion of the thread 1 is performed at a position indicated by an arrow V immediately before the paper layers overlap each other. As a method for extracting threads,
A method in which a thread is fed by using a feed pipe having an uneven inner wall as proposed by the same applicant as the present invention in the above-mentioned Japanese Patent Publication No. Hei 5-40080, or the aforementioned US Pat.
The method proposed in Japanese Patent No. 462866 can be adopted.

According to the method of the present invention described above, forgery prevention paper having the structure shown in FIGS. 1 and 2 can be manufactured. FIG. 1 is a top view of a window-threaded paper obtained by the present invention,
FIG. 2 is a partially enlarged perspective view of this. In the outermost paper layer 4 formed by the circular cylinder cylinder with the mold 13 attached, a window opening 2 in which the stock is not placed is formed in a portion corresponding to the mold. By inserting the thread 1 between the paper layers so as to enter into the window part 2, the thread is exposed in the window part 2, and the thread is provided between the paper layers in the tunnel part 3 (non-window part). Is buried.

In the method for producing anti-counterfeit paper of the present invention, it is also possible to apply starch, polyvinyl alcohol, various surface sizes, etc. to the paper surface during the paper making process using a size press or the like. Further, if necessary, a machine calendering treatment or a super calendering treatment is performed to appropriately improve the surface smoothness.

As the thread used in the present invention, any type of thread conventionally proposed for preventing forgery, such as a thread for gold and silver thread, a hologram thread, a magnetic thread, and a fluorescent thread, can be used. For example, a thread for gold / silver yarn is manufactured by vacuum-depositing metal aluminum on a polyester film, coating a resin for protection on the deposition surface, and slitting with a microslitter. A gold thread can be manufactured by coloring the resin to be applied yellow. A heat-sensitive adhesive is applied to the back surface of the thread (the surface opposite to the surface exposed at the window opening). As a result, the heat-sensitive adhesive functions by the heat of the drying zone of the paper machine, and the thread and the paper are more securely bonded to each other.

Usually, no adhesive is applied to the surface of the thread exposed on the window opening, or even if the adhesive is applied, the surface of the thread exposed on the window opening and paper forming the tunnel portion are formed. It is necessary to use a very small amount of coating that does not substantially adhere to the layer. This is because, as described later, the paper layer on the thread constituting the tunnel portion is easily peeled off by rubbing with a nail or the like, and the forgery prevention effect is enhanced.

If the width of the thread is too large, when the paper layer on which the window is formed and the other paper layer (paper layer on which no work is performed) are combined and dewatered with a press roll or the like, the tunnel section is formed. Collapse is likely to occur. According to the results of studies by the present inventors, it has been found that a practical problem arises when the thread width exceeds 5 mm.

In the present invention, the size of the mold used by being attached to the mesh cylinder is such that the length of the paper layer in the flow direction is 5 to 3 mm.
0 mm, the length in the horizontal direction perpendicular to the paper layer flow direction is 10
It is preferable to set it to 50 mm. The size of the mold corresponds to the size of the window opening of the sheet shown in FIG. Regardless of whether the window portion is smaller or larger than this range, the exposed length of the thread is too short or too long, resulting in poor balance in terms of design.

The window-threaded paper obtained in the present invention is usually produced at a basis weight of 70 to 150 g / m ² . Further, the ratio of the outermost paper layer (the paper layer forming the window opening) to the other paper layers is preferably 20:80 to 80:20. For example, in the case of manufacturing a two-layer paper having a basis weight of 100 g / m ² , the application ratio is 20: 8.
0 is 20 g / m ² for the outermost paper layer and 8 for the other paper layers.
0 g / m ² . If the ratio of the outermost paper layer is less than 20, the sharpness of the window opening tends to be lost, and if it exceeds 80, the window opening tends to collapse.

In the above-described embodiment, a paper layer having no window opening is formed in the first tank, and an outermost layer having a window opening is formed in the second tank (final tank). I have. However, in the present invention, an embodiment in which the outermost paper layer having a window opening is formed in the first tank and the paper layer without any work is formed in the second tank (final tank). Can also. In this case, the mold for providing the window opening is attached by the same means as described above over the entire circumference of the upper net of the first cylinder net cylinder.

[0029]

EXAMPLES Example 1 Preparation of Paper Stock 350 parts by weight of 20 parts by weight of NBKP and 80 parts by weight of LBKP
C. S. F. 10 parts by weight of clay, 0.3 parts by weight of a paper strength agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), a sizing agent (trade name "Size Pine E", Arakawa 1.0 part by weight (manufactured by Chemical Industry Co., Ltd.) and an appropriate amount of a sulfuric acid band were added to prepare a stock.

Production of Paper Netting Many resin plates having a short side of 10 mm, a long side of 15 mm, and a thickness of 0.3 mm were prepared. Then, a resin plate is placed on the upper screen (width 1300 mm) of the screen cylinder of the screen paper machine using an adhesive so that the short side is positioned with respect to the flow direction of the paper by 10 m.
They were continuously attached at m intervals. Six rows were attached at equal intervals in the width direction of the upper net.

Production of thread A heat-sensitive adhesive is applied to a thickness of 7 μm on the aluminum-deposited surface of a hologram film having a thickness of 16 μm, slit into a predetermined width using a microslitter, and wound around a bobbin. I took it.

Paper making The upper cylinder to which the above-mentioned mold (resin plate) is attached is attached to the first cylinder of the two-tank type circular net paper machine, and the upper net without any work is applied to the second cylinder of the round net cylinder. Was attached. The second paper layer formed in the second tank is overlapped on the first paper layer formed in the first tank, and two layers are laminated at a paper making speed of 30 m / min using the above-mentioned stock. Paper was manufactured. At this time, the first
The hologram thread having a width of 1.8 mm is interposed between the layer (33 g / m ² in terms of dry weight) and the second layer (67 g / m ² ) using the method proposed in Japanese Patent Publication No. 5-40080. Inserted at a position corresponding to the center of the mold. Further, the thread was coated with an adhesive-coated surface so as to be in contact with a wet paper formed by a cylinder provided with an upper net without any work. Next, the wet paper was dewatered according to a conventional method, and then dried with a cylinder dryer to produce a window-threaded paper made of two-layer laminated paper.

Example 2 A window-threaded paper was manufactured in the same manner as in Example 1 except that the thread width was changed to 5.0 mm.

Example 3 Windowed thread-containing paper was manufactured in the same manner as in Example 1 except that the thread width was changed to 2.5 mm.

COMPARATIVE EXAMPLE 1 Windowed thread-containing paper was manufactured in the same manner as in Example 1 except that the thread width was changed to 1.2 mm.

COMPARATIVE EXAMPLE 2 Windowed thread-containing paper was manufactured in the same manner as in Example 1 except that the thread width was changed to 7.0 mm.

When the window-threaded paper obtained in each of the examples and the comparative examples was viewed over light, the collapse of the tunnel portion was visually observed and evaluated by a five-point method. The level at which there is no problem is 5 points, the level at which collapse occurs and a problem is 1 point, and 3 points or more means a level which is practically no problem.
Table 1 shows the evaluation results.

Printing evaluation was performed using an offset rotary printing press (four-color press) using the window-threaded paper obtained in each of the examples and comparative examples. The degree to which the fiber was taken on the blanket was observed and observed, and the evaluation was made according to a 5-point method in which the level at which no fiber was taken and there was no problem was 5 points, and the level at which the fiber was taken and a problem was 1 point was evaluated. Three or more points mean a practically acceptable level. Table 1 shows the evaluation results.

The tunnel portion of the window-threaded paper obtained in each of the examples and comparative examples was rubbed with a nail to evaluate the degree of peeling of the paper layer. The evaluation was made according to a five-point method in which the level at which the film was easily peeled was 5 points and the level at which the film was not easily peeled was 1 point. Table 1 shows the evaluation results.

[0040]

[Table 1]

From Table 1, it can be seen that in the embodiment of the present invention in which the thread width is 1.8 to 5 mm, the collapse of the tunnel portion, the difficulty in removing the fiber onto the blanket at the time of offset printing, and the occurrence of nails as compared with the comparative example. It can be seen that the ease of peeling of the tunnel portion has attained a practically satisfactory level.

[0042]

As described above, the paper with a window thread obtained by the present invention has a feature that the paper itself has a high anti-counterfeiting effect as compared with the foil transfer paper, and The thread buried in the tunnel can be exposed by rubbing the tunnel with a nail or the like. This feature has a remarkable effect that the authenticity of the paper can be immediately determined, unlike the forgery-prevention printed matter in which the transfer foil is transferred to a window-threaded paper.

The anti-counterfeit paper obtained according to the present invention by utilizing the above characteristics can be suitably used for bills, checks, stock certificates, bonds, gift certificates, cards, confidential documents, passports, identification cards and the like.

[Brief description of the drawings]

FIG. 1 is a top view of an example of a window-threaded paper obtained according to the present invention.

FIG. 2 is a partially enlarged perspective view of an example of a window-threaded paper obtained according to the present invention.

FIG. 3 is an explanatory view showing an example of a mesh paper machine that can be used for producing the window-threaded paper of the present invention.

FIG. 4 is a partial explanatory view showing a state in which a mold for forming a window opening is attached to the upper net of the net cylinder used in the net paper machine of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 thread 2 window opening 3 tunnel 4 outermost paper layer 13 type V thread insertion point

Claims (1)

[Claims] 1. In a window-threaded paper having a thread (1) intermittently exposed on the surface of the paper, the width of the thread is 1.8 to 5 mm and the thread is exposed to a window opening (2). A window-threaded paper, characterized in that the surface of the side thread and the paper layer forming the tunnel portion (3) are not substantially bonded.