JP3109721B2 - Anti-counterfeit paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to anti-counterfeit paper and a method for producing the same. Specifically, the forgery prevention paper is characterized in that the thread is exposed at a window opening provided on the surface of the paper.

[0002]

2. Description of the Related Art Forgery prevention paper called thread-containing paper in which a thread is inserted in a paper layer is well known. For example, there is a thread formed by forming a thin layer of metallic aluminum on a polyester film surface by a vacuum evaporation method, coating a resin on the surface, and slitting the thin film with a micro slitter. At this time, if the resin is colored yellow, a gold thread can be obtained. As described later, there are various types of the above-mentioned thread-like materials, and the paper into which these are made has a great effect in preventing forgery because it requires extremely advanced technology for production, and is widely used for banknotes of various countries. I have.

[0003] In order to produce this thread-containing paper, a nozzle is inserted into the flow of the stock in the slice portion of the fourdrinier paper machine, and the yarn is fed out while flowing water through the nozzle, and the yarn is fed into the paper web formed on the papermaking net. A method of making a filamentous material (Japanese Patent Publication No. 52-48660)
No.), a method of installing a thread into the slurry flowing out of the flow box of the fourdrinier paper machine, and making the thread in a non-contact state with the thread by air flow (Japanese Patent Publication No. 4-78760). Using a mesh paper machine having two or more tanks, sending out the thread-like material between the paper layers by using a feeding pipe provided with irregularities on the inner wall by laminating two or more layers,
A method of making a thread between paper layers (Japanese Patent Publication No. 5-40080)
No.) etc. are known.

In the case of anti-counterfeit paper in which a thread is completely formed in a paper layer, the paper must be held over an electric lamp or the like to determine the presence or absence of the thread when judging the authenticity of the sheet. Doing this work in front of the customer can cause discomfort to the customer. For this reason, threaded paper called "window opening" in which a part of the thread is exposed on the surface of the paper is manufactured.

[0005] In order to manufacture this windowed threaded paper, a belt mechanism having a groove through which a thread is passed at the tip of the projection is buried in the stock suspension on the wire, and the threaded paper having a window is removed. A method of manufacturing (Japanese Patent Publication No. 5-85680), or using a mesh processed into an irregular shape as the upper net of a round paper machine, inserting a thread while making contact with the uneven portion on the surface of the mesh, and forming a thread at the piercing portion. (US Pat. No. 4,462,866), or a method in which a compressed air nozzle is incorporated in a rotating drum on a wire of a fourdrinier paper mesh, and a slurry on a thread inserted into a web is intermittently compressed with compressed air. A method for producing paper with a window-opening thread (Japanese Patent Laid-Open No. 6-272200) has been proposed.

[0006]

Problems to be Solved by the Invention Japanese Patent Publication No. Hei 5-8
With the window-opened threaded paper proposed in No. 5680, the outline of the window-opening portion becomes unclear due to only a slight change in the state of the drainage of the stock on the papermaking net, and the thread-like material cannot be clearly seen, or during operation. However, since the belt swells outward due to centrifugal force, it is extremely difficult to keep the belt horizontal with respect to the papermaking net, and there is a problem that the thread cannot be stably inserted.

[0007] Further, in the window-opening thread-containing paper proposed in US Pat. No. 4,462,866, the mesh is processed into an uneven shape to form the window opening, so that the outline of the window opening becomes unclear and the thread is clearly visible. There was a problem that could not be done.

[0008] Further, in the threaded paper with a window opening proposed in JP-A-6-272200, the compressed air blows off the slurry more than necessary, so that the formation at that location is impaired. To prevent this, the air pressure of the compressed air is reduced. Then, there are many places where the filamentous material is not exposed on the surface of the milling portion, and there is also a problem that the filamentous material cannot be clearly recognized.

[0009] Further, as is common to these papers, there is a problem that the paper cannot be wound into a roll in a long length. Since the thread has a thickness of several tens of μm and is continuously laid at a specific position on the paper, when it is wound into a roll, the thickness of the paper at the point where the thread is laid is gradually increased. In time, wrinkles will be formed at that location. According to the study by the present inventors, it has been confirmed that when a thread having a thickness of about 15 μm is continuously formed on paper of 100 g / m 2, when the thread is wound up into a roll of about 1000 m, wrinkles are generated at the thread insertion portion. Was. When wrinkles occur, the take-up of the paper further causes the paper after the occurrence of wrinkles to be defective. Whether or not the paper is finished in a roll shape greatly affects productivity when printing is performed on the paper later. This is because if the paper cannot be roll-finished, it must be plain-finished.

An object of the present invention is to solve these problems. Specifically, it has a window opening with a sharp outline,
An object of the present invention is to provide a forgery-preventing paper sheet in which a thread is inserted at that location so that the thread can be clearly recognized, and which can be wound up as required, and a method of manufacturing the same.

[0011]

The wrinkling of the paper is caused by the local increase in the thickness of the paper as described above. In order to solve this problem, the present inventors can reduce wrinkles by partially reducing the thickness of the paper so as to offset a local increase in the thickness of the paper, and by providing a specific window opening. Various investigations were made based on the idea that the thread inserted therein could be clearly recognized. As a result, it has been found that the above problem can be solved by providing a window opening of a specific size on the surface of the paper and applying a thread to the portion.

The present invention will be described with reference to the drawings. FIG. 1 is a top view of an example of the anti-counterfeit paper obtained by the present invention, and shows a part thereof. FIG. 2 is a partially enlarged view of FIG. Thread-like material 3 indicates a penetrated portion for characters and images.

The gist of the present invention is that one or more windows 1 are provided continuously in the longitudinal direction of the paper, and the length of each window opening in the paper flow direction is 2 to 2. 2
0 mm, and 20 to 100 window openings per row are provided per meter. In the forgery prevention paper in which the thread material 2 is exposed, the window opening 1 and the next window are provided. The forgery prevention paper is characterized in that at least one or more characters and image insertion portions 3 are continuously provided between the opening portions.

Next, an example of the method for producing a forgery prevention paper of the present invention will be described in detail. Preparation of paper stock Softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulphite pulp (NBSP), thermomechanical pulp (TMP), etc. , A wet paper strength enhancer, a sizing agent, a fixing agent, a retention improver, a drainage improver, an antifoaming agent, a dye, a coloring pigment, a fluorescent agent and the like are appropriately used in combination. S. F. To be prepared.

Forming of paper Metal, metal, is placed on the upper net of the net cylinder used in the net paper machine.
A mold corresponding to the window opening made of resin, paper, or the like is attached with a thin metal wire, soldered, or attached with an adhesive. The shape corresponding to the window opening portion may be any shape, for example, a square, a rectangle, a circle, an ellipse, or the like. This mold needs to be mounted such that the length of each window opening is 2 to 20 mm in the paper flow direction, and that 20 to 100 window openings are provided per meter of paper. This is because if not within this range, the thread is not exposed to the window opening and the thread cannot be clearly seen.

In this case, at least one or more characters or images can be continuously provided between the window opening and the next window opening, and the forgery prevention effect can be further enhanced. The method of forming the piercing portion is a conventionally used method, that is, a piercing mold made of metal, resin, paper, etc. is attached with a thin metal wire, soldered,
It is performed by a method of attaching with an adhesive or the like.

[0017] A mesh provided with the above-mentioned mold is attached to the upper net of the net cylinder forming the outermost layer of the multi-tub type net web machine, and the upper net without any work is attached to the cylinder of the other tank. Paper is made according to the method. In order to form a thread between the outermost paper layer and another paper layer, a thread tube provided with irregularities on the inner wall is used as proposed by the present applicant in Japanese Patent Application No. 1-205332. It is done by the method of sending in things.

In the present invention, it is also possible to apply starch, polyvinyl alcohol, various surface sizes and the like to the paper surface during the paper making process using a size press device or the like. Further, if necessary, a machine calendering treatment or a super calendering treatment is performed to appropriately improve the surface smoothness.

According to the present invention, if the thread is formed so as to be periodically shifted from one end to the other end of the window opening, the local thickness of the winding caused by the thread is reduced. The increase is spread so that longer lengths of paper can be wound. This is performed by periodically swinging the thread insertion device proposed by the present applicant in Japanese Patent Application No. 1-205332 in the lateral direction of the paper.

The thread used in the present invention is not limited to a thread such as a twisted thread, but may be any type of thread proposed for preventing forgery, such as a thread for gold and silver threads, a hologram thread, a magnetic thread, and a fluorescent coloring thread.

[0021]

【Example】

Example 1 350 ml 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. 3mm short side, 15m long side on the net (width 1300mm) on the cylinder of the round paper machine
An m-shaped rectangular resin mold having a thickness of 0.5 mm was continuously attached at intervals of 30 mm so that the short side was positioned in the longitudinal direction of the paper. Six rows were mounted at equal intervals. A net without any work was attached to the cylinder of the first tank of the two-tank type circular net paper machine, and the net with the work was attached to the second tank.
When producing a two-layer laminated paper at a papermaking speed of 80 m / min using the above stock, the first layer (50 g / m2 in terms of dry weight) is produced.
A thread for gold and silver thread having a thickness of 15 μm and a width of 1.0 mm is provided between the second layer and the second layer (50 g / m 2).
Using a device proposed in No. 32, the paper was inserted into a position corresponding to the center of each mold, and then dried with a cylinder dryer to produce anti-counterfeit paper.

Example 2 A sled insertion device was mounted in the width direction of the paper with an amplitude width of 15 mm.
An anti-counterfeit paper was manufactured under the same conditions as in Example 1 except that the paper was periodically reciprocated at reciprocation / minute. It was observed that the anti-counterfeit paper was much less wrinkled at the thread insertion portion than the paper of Example 1 when wound up.

[0023]

As described above, the anti-counterfeit paper of the present invention is constituted and has the following remarkable effects. 1) Compared with the conventional thread-filled paper in which a thread is inserted in a clearance portion of a character or image, in the present invention, the inserted thread is clearly visible because a window opening having a large opening is formed. 2) If necessary, manufacture the anti-counterfeit paper rolled up in a long length in a roll by periodically shifting the position of the thread from one end to the other end in the width direction of the paper. You can do it.

[Brief description of the drawings]

FIG. 1 is a partial view of an example of a forgery prevention sheet of the present invention as viewed from above.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

 1 Window opening part 2 Thread material 3 Text and image insertion part

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-69698 (JP, A) JP-A-6-272200 (JP, A) JP-A-48-75808 (JP, A) 62320 (JP, B2) Table 6 6-503128 (JP, A) US Patent 4,186,943 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D21H 27/40-27/48

Claims (2)

(57) [Claims] 1. A window opening portion 1 is continuously provided in a longitudinal direction of a sheet.
The number of rows of windows is 2 to 20 mm in the direction of paper flow, and the number of rows of windows is 20 to 100 per meter. In the forgery prevention paper 1 in which the thread 2 is exposed, at least one or more characters or image insertion portions 3 are continuously provided between the window opening 1 and the next window opening. Anti-counterfeit paper characterized by the following. 2. The thread is periodically displaced from one end to the other in the width direction of the sheet in the window opening portion 1, and the sheet is wound in a roll. 2. The forgery prevention paper according to claim 1, wherein: