JPH10292294A - Production of thread-containing paper for preventing counterfeit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing an excellent paper for preventing counterfeit, without causing a flaw on an adhesive layer of the surface of thread in a drying process after paper making and without staining a dryer drum with an adhesive of the thread in the production of a paper for preventing counterfeit of a type, in which a thread supplied with an adhesive layer is repeatedly exposed and embedded. SOLUTION: In this method for producing a paper for preventing counterfeit by adding a thread obtained by providing both the sides of a filamentous or taped substrate with a thermoplastic and/or a water remoistening adhesive into a paper layer so as to alternately expose and embed the thread at one side of a paper, a releasing agent is applied to the surface of a cylindrical type dyer to be brought into contact with the thread in a drying process. Otherwise, the paper for preventing counterfeit is produced while spraying the releasing agent to the surface of the cylindrical type dryer to be firstly brought into contact with the thread in the drying process. A polyolefin wax or one selected from a higher fatty acid or a higher fatty acid salt having a melting point lower than the surface temperature of a dryer having the highest temperature is used as the releasing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a thread-prevention forgery-prevention sheet. More specifically, the present invention relates to a method of manufacturing a forgery prevention paper of a type in which a thread is repeatedly exposed and buried alternately.

[0002]

2. Description of the Related Art In recent years, advances in copier technology have facilitated the forgery of securities and have become a major social problem. Banknotes, gift certificates, checks, stock certificates, passports, identification cards, cards, etc. Various forgery prevention measures have been taken to prevent unauthorized alteration and forgery.

As a countermeasure for preventing forgery, JP-A-48-75
No. 808, JP-B-52-48660, JP-A-51-1
For example, there is a forgery prevention paper referred to as a so-called threaded paper in which a thread (referred to as a thread) is formed between paper layers described in Japanese Patent No. 30308 or the like.

[0004] The form of the thread to be formed between the paper layers is generally about 10 to 100 µm in thickness and 0.2 to 30 mm.
It is in the form of a thread or tape having a width of about one. For example, gold thread, silver thread, plastic film, metal-deposited film and the like are used. In recent years, holograms, pixelgrams, grating images, etc., which are extremely difficult to duplicate, are affixed to credit cards, banknotes, etc. to prevent counterfeiting by advanced copier technology, but these are also used as threads . The anti-counterfeit paper incorporating these threads cannot be forged in the metallic luster portion of the threads even when copied with a copying machine, and is difficult to falsify.

However, if the paper layer and the thread are not firmly bonded to each other in the anti-counterfeit paper into which the thread is formed, pulling the thread causes the thread to slip out of the paper layer, thereby impairing the value of the anti-counterfeit paper or falling off. This may cause the thread to be used for forgery or alteration.

As means for solving such a problem, for example, a water-soluble adhesive is used for a size press solution in a paper making process, or a thermoplastic resin is used for a thread as described in JP-A-7-56377. A method of applying a resin or a water-soluble adhesive to improve the adhesive strength to a paper layer, and the like can be given. However, sufficient adhesive strength cannot be obtained with a size press liquid, and it is difficult to apply a thermoplastic resin or a water-soluble adhesive to a thread and to form a paper between paper layers with existing equipment.

In the method of using a thread provided with an adhesive layer in advance, when the adhesive layer provided on the exposed portion of the thread comes into contact with the cylindrical dryer in the drying step, the adhesive layer on the thread surface is damaged. This may cause the appearance of the forgery prevention paper to be impaired, or the transfer of adhesive may contaminate the dryer surface.

On the other hand, as a means for solving such a problem, as described in Japanese Utility Model Registration No. 3034283, a layer which is not melted or softened by heat is provided on the side of the thread in contact with the dryer drum. There is a method, but in this case, the paper layer of the thread covering portion rises from the surface of the thread, which is not preferable because the appearance of the anti-counterfeit paper is inferior.

[0009]

An object of the present invention is to provide a type of anti-counterfeit paper in which a thread provided with an adhesive layer is repeatedly exposed and buried alternately. The present invention relates to an excellent method for producing an anti-counterfeit paper in which no scratches are generated and the dryer drum is not contaminated by the adhesive of the thread.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on a method for producing anti-counterfeit paper with thread, in particular, on a drying process after papermaking. As a result, a release agent was used on the surface of a cylindrical dryer in contact with the thread. By improving the slipperiness and releasability of the thread plasticized with heat and moisture from the adhesive surface, it is possible to reduce the occurrence of scratches on the thread adhesive surface and the transfer of the adhesive to the dryer surface. As a result, the present invention has been completed.

That is, according to the present invention, a thread in which a thermoplastic and / or water-rewetting adhesive layer is provided on both surfaces of a thread-like or tape-like substrate is alternately exposed and buried on one side of paper. A method for producing anti-counterfeit paper with a thread as described above, wherein a release agent is applied to the surface of a cylindrical dryer in contact with the thread in the drying step. .

[0012] The present invention also relates to the above-mentioned method for producing anti-counterfeit paper with thread, characterized in that the anti-counterfeit paper is produced by spraying a release agent onto the surface of the cylindrical dryer which first comes into contact with the thread in the drying step. This is a method for manufacturing forgery prevention paper.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The anti-counterfeit paper of the present invention is obtained by inserting a thread in which an adhesive has been applied to a base material in advance and drying the thread between paper layers in a laminating step of a paper machine and drying.

That is, in the anti-counterfeit paper with thread of the present invention, the thread is inserted between the paper layers at least before performing the final lamination with a multi-layer paper machine, and the moisture and drying during the lamination are performed. The heat of the process plasticizes the adhesive layer provided on the thread in advance and adheres it to the paper layer.

According to the present invention, by applying a release agent to the surface of the dryer, it is possible to suppress the occurrence of scratches and the transfer of the adhesive to the surface of the dryer when the adhesive surface of the thread exposed portion comes into contact with the dryer. .

The release agent used in the present invention includes, for example, higher fatty acids such as stearic acid, oleic acid and palmitic acid and salts thereof such as calcium, zinc, sodium and ammonium, stearic acid amide, ethylenebisstearic acid Amides such as amide and methylenebisstearic acid amide; higher alcohols such as cetyl alcohol and stearyl alcohol; fats and oils such as funnel oil and lecithin; hydrocarbons such as microcrystalline wax, paraffin wax and polyolefin wax; Examples include various surfactants such as a surfactant, fluorine-based polymers such as ethylene tetrafluoride polymer and ethylene-tetrafluoroethylene polymer, and other surfactants having a releasing effect.

Among the above release agents, higher fatty acids, higher fatty acid salts, polyolefin waxes and the like are particularly preferable because of their excellent releasing effect. However, when higher fatty acids or higher fatty acid salts are used, they are higher than the surface temperature of all dryers. If the melting point of the release agent is high, the release agent may remain on the surface of the anti-counterfeit paper and deteriorate printability, which is not preferred. Conversely, if the melting point of the release agent is lower than the surface temperature of the dryer with the highest temperature, the excess release agent is melted by the heat of the dryer and penetrates into the forgery prevention paper without deteriorating printability, preferable. On the other hand, polyolefin wax is particularly preferable because it does not deteriorate printability irrespective of the melting point, softening point and the like.

These release agents may be rubbed directly against the surface of the dryer as they are in a solid or liquid state, or may be formed into an aqueous dispersion to an appropriate concentration and sprayed onto the surface of the dryer. When spraying, it is particularly preferable to use an aqueous dispersion of a polyolefin wax or a higher fatty acid or an ammonium salt thereof having a melting point lower than the surface temperature of the dryer having the highest temperature. Among them, an emulsion of polyethylene wax and an aqueous solution of ammonium oleate are most preferable.

If the release agent is applied beforehand on the surface of all cylindrical dryers in contact with the thread before the manufacture of the thread-containing anti-counterfeit paper, the release agent can be used for a relatively short time. The desired effect of the present invention can be obtained without peeling off from the dryer.

In order to cope with long-term production,
It is preferable to spray the release agent while producing thread-containing forgery prevention paper. In this case, the release agent may be sprayed on all the cylindrical dryer surfaces in contact with the thread,
If the release agent is sprayed only on the surface of the cylindrical dryer that comes into contact with the thread first, the release agent gradually transfers to the surface of the dryer that comes into contact with the thread thereafter, so that a sufficient effect can be obtained. In this case, in order to appropriately adjust the amount of the release agent on the surface of the dryer, the concentration and the spray amount of the release agent may be adjusted, or the spray time of the release agent may be controlled.

The release agent applied to the surface of the dryer in this way can suppress the occurrence of scratches by improving the slipperiness with the thread surface provided with the adhesive layer, and can prevent the adhesive layer from being damaged. Transfer of the adhesive to the surface of the dryer can be suppressed by making it easy to peel off from the surface of the dryer.

The type of thread adhesive used in the present invention is not particularly limited, and may be an acrylic resin, a styrene-butadiene resin, a styrene-isoprene resin, a polyester resin, an ethylene-vinyl acetate resin, a vinyl acetate resin.
Known and publicly used resin compositions which can be generally used as a heat seal adhesive or a water rewetting adhesive, such as a vinyl alcohol-based resin, are used.

These resins may be used as an adhesive as they are, or a plurality of resins may be mixed and used.
If necessary, various known dyes and pigments, release agents, surfactants such as defoamers and wetting agents, and auxiliary agents such as antiblocking agents, lubricants and thickeners may be added.

[0024] The method of applying the adhesive is performed by various coating apparatuses such as brush coating, spray coating, a roll coater, a Meyer bar coater, a gravure roll coater, a blade coater, and an air knife coater. Done in a conventional manner. In addition,
The amount of coating is preferably about 1 to 15 g / m ² in terms of dry weight.

The thread base material used in the present invention is not particularly limited, but has a thickness of 10 to 100 μm which is thin and excellent in strength.
In general, PET films of about m are often used. PE
The T film is subjected to metal deposition, printing of characters and patterns, optical special processing such as holograms, pixelgrams, grating images, etc., for the purpose of preventing forgery and decorative purposes. It can also be provided. The thread base material is coated with an adhesive, dried, slit into a predetermined width, and used as a thread.

The thread thus obtained is inserted between paper layers in a laminating step of a known multi-layer paper machine combining various wire parts, and if necessary, various surface sizing agents and the like are sized during the paper making. It is coated with a press or the like and dried with a drier to obtain the desired thread-containing forgery prevention paper. Further, the obtained anti-counterfeit paper with thread may be subjected to a machine calendar or a super calender treatment, or a pigment coating layer, a heat-sensitive recording layer, a thermal transfer image receiving layer, etc. may be provided on the surface by various coating apparatuses.

The anti-counterfeit paper obtained by the present invention is usually further subjected to desired printing and cutting, etc., and is provided with banknotes, gift certificates, magnetic recording layers, and used for tickets, prepaid cards and the like.

[0028]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which, of course, are not intended to limit the present invention.

[Preparation of thread A]
2 μm aluminum evaporated PET film (trade name “G130
2E-12 "PE made by Diafoil Hoechst Co., Ltd.)
A glass transition temperature of about 30 ° C. and a gel content of about 85
% SBR emulsion type adhesive (trade name "P-66")
31 "manufactured by Sumika Eibiesu latex 3 g / m ² and Co., Ltd.) by dry weight, polyester glass transition temperature of about 28 ℃ the aluminum deposited side solution type adhesive (trade name" PE
S-370S30 (manufactured by Toagosei Chemical Industry Co., Ltd.) was applied by a gravure roll coater and dried so as to have a dry weight of 3 g / m ² . Then, after slitting it to a width of 1 mm with a micro slitter, winding it around a bobbin,
I got

[Preparation of thread B]
2 μm aluminum evaporated PET film (trade name “G130
2E-12 "PE made by Diafoil Hoechst Co., Ltd.)
A glass transition temperature of about 25 ° C. and a gel content of about 80
% Acrylic emulsion type adhesive (trade name "Nip
ol LX814 (manufactured by Zeon Corporation) in a dry weight of 3 g / m ² and a glass transition temperature of about 32
A polyester-based solution-type adhesive (trade name “Plus Coat RZ-648” manufactured by Taiyo Kagaku Kogyo Co., Ltd.) was applied and dried with a gravure roll coater to a dry weight of 3 g / m ² . Then 1m with micro slitter
After slitting to a width of m, it was wound around a bobbin to obtain a thread B.

[Preparation of thread C]
2 μm aluminum evaporated PET film (trade name “G130
2E-12 "PE made by Diafoil Hoechst Co., Ltd.)
A glass transition temperature of about 35 ° C. and a gel content of about 55
% SBR emulsion type adhesive (trade name “P-65
22 "Sumika ABS Latex Co., Ltd.) is a polyester-based solution-type adhesive (trade name" PE ") having a dry weight of 3 g / m ² and a glass transition temperature of about 28 ° C.
S-370S30 (manufactured by Toagosei Chemical Industry Co., Ltd.) was applied by a gravure roll coater and dried so as to have a dry weight of 3 g / m ² . Then, after slitting it to a width of 1 mm with a micro slitter, winding it around a bobbin,
I got

Example 1 [Manufacture of anti-counterfeit paper] A tape of 1 cm × 1 cm was previously placed on the same circumferential surface of the mesh cylinder of the first tank of a mesh paper machine having two tank bats. 1cm
The mesh was closed at intervals to form a first paper layer (Kazama rice tsubo 35 g / m ² ) with a 1 cm × 1 cm hole in every 1 cm. No work was applied to the cylinder cylinder of the second tank, and a plain second paper layer (Kazama rice tsubo 70 g / m ² ) was formed. Further, the thread unwinding device is installed between the cylinders of the first tank and the second tank, and the thread is inserted in a position where the thread overlaps the hole of the first paper layer so that the second paper layer and the aluminum deposition surface side are in contact with each other. I made it. In addition, the wet paper (water content of about 50
%) Is 12 cylinder dryers (surface temperature about 6
After drying at 0 ° C to 120 ° C), it is subjected to machine calendering.

Ammonium oleate (trade name "DEF-115" manufactured by Nissin Chemical Laboratory Co., Ltd.) was previously applied as a mold release agent to six surfaces of the twelve cylinder dryers in contact with the threads. Further, during the papermaking, first, the same release agent is continuously sprayed on the surface of the dryer in contact with the thread. Using the threading machine A prepared above, anti-counterfeit paper of the type in which the thread was repeatedly exposed and buried on one side was obtained using the thread A produced.

Example 2 Instead of ammonium oleate as a mold release agent, polyethylene wax (trade name “Maycatex HP-50”) was used.
Example 1 except that Meisei Chemical Co., Ltd.) was used.
In the same manner as described above, forgery prevention paper was obtained.

Example 3 An anti-counterfeit paper was prepared in the same manner as in Example 1, except that zinc stearate (trade name “Hydrin Z-7” manufactured by Chukyo Yushi Co., Ltd.) was used instead of ammonium oleate as a release agent. Obtained.

Example 4 An anti-counterfeit paper was obtained in the same manner as in Example 1, except that soybean lecithin (trade name “Separ 380” manufactured by Chukyo Yushi Co., Ltd.) was used instead of ammonium oleate as a release agent.

Example 5 Ammonium oleate (trade name "DEF-115" manufactured by Nissin Chemical Laboratory Co., Ltd.) as a releasing agent previously applied to the surface of the dryer, and soy lecithin (trade name) as a releasing agent sprayed on the surface of the dryer Forgery prevention paper was obtained in the same manner as in Example 1 except that the name “Separ 380” manufactured by Chukyo Yushi Co., Ltd.) was used.

Example 6 Ammonium oleate (trade name “DEF-115” manufactured by Nissin Chemical Laboratory Co., Ltd.) was used as a release agent to be applied to the surface of the dryer in advance, and the release agent was sprayed on the surface of the dryer. Except for the absence, a forgery prevention paper was obtained in the same manner as in Example 1.

Example 7 Forgery prevention paper was obtained in the same manner as in Example 1 except that thread B was used instead of thread A.

Example 8 Thread B was used instead of thread A, and polyethylene wax (trade name “Maycatex HP-50” manufactured by Meisei Chemical Industry Co., Ltd.) was used as a release agent to be applied to the surface of the dryer in advance. An anti-counterfeit paper was obtained in the same manner as in Example 1 except that soybean lecithin (trade name “Separ 380” manufactured by Chukyo Yushi Co., Ltd.) was used as a release agent to be sprayed.

Example 9 Forgery prevention paper was obtained in the same manner as in Example 2 except that thread C was used instead of thread A.

Comparative Example 1 Sodium dodecylbenzenesulfonate (trade name "Nurex R" manufactured by NOF CORPORATION), which is a detergent and has no releasing effect, was used in place of ammonium oleate as a releasing agent. Except for the above, forgery prevention paper was obtained in the same manner as in Example 1.

Comparative Example 2 An anti-counterfeit paper was obtained in the same manner as in Example 1 except that no release agent was used.

Comparative Example 3 Forgery prevention paper was obtained in the same manner as in Example 1, except that thread B was used instead of thread A, and no release agent was used.

Comparative Example 4 Forgery prevention paper was obtained in the same manner as in Example 1 except that thread C was used instead of thread A, and no release agent was used.

[Evaluation] The frequency of occurrence of scratches on the thread and the state of contamination on the dryer surface during the production of the anti-counterfeit paper containing each thread were evaluated by the following methods. The results are shown in Table 1.

[Thread damage] Immediately after the start of production and about 2
Regarding the anti-counterfeit paper with thread after manufacturing 0000 m, the occurrence of scratches on the thread surface was determined according to the following criteria. ：: The thread is not scratched at all and is extremely excellent in appearance. ：: Some scratches are seen on the thread, but there is no practical problem. Δ: Thread scratches are slightly noticeable and inferior in appearance, but at the limit of use. ×: The thread is severely damaged and cannot be used.

[Doller Contamination] After about 20000 m of anti-counterfeit paper with thread was manufactured, the state of contamination of the dryer surface by the adhesive was determined according to the following criteria. ：: No contamination of the dryer surface by the adhesive was observed. ：: Slight contamination is observed on the dryer surface, but there is no problem in production. Δ: The dryer surface is contaminated by the adhesive, and there is a slight problem in production. X: The contamination of the dryer surface is severe, which may hinder production.

[0049]

[Table 1]

[0050]

As is clear from the results shown in Table 1, the present invention can produce a thread-proof anti-counterfeit paper without damaging the thread surface or contaminating the dryer surface due to the transfer of the adhesive. In addition, other than Example 3, forgery prevention paper excellent in printability could be manufactured.
In Example 3, since zinc stearate having a high melting point (melting point: about 140 ° C.) was used as a release agent, the printing suitability as a forgery prevention paper was slightly inferior even if it was preferable in production.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tadashi Moriya 1 at Yanagicho, Shizuoka City, Shizuoka Prefecture

Claims (3)

[Claims] A thread having a thermoplastic and / or water-rewetting adhesive layer provided on both sides of a thread-like or tape-like substrate is formed on a paper layer such that the thread alternately repeats exposure and burial on one side of the paper. A method for producing anti-counterfeit paper with thread, wherein a release agent is applied to the surface of a cylindrical dryer in contact with a thread in a drying step. 2. A method for producing anti-counterfeit paper with thread, characterized in that the anti-counterfeit paper with thread is produced by spraying a release agent on the surface of the cylindrical dryer that first comes into contact with the thread in the drying step. 3. The method according to claim 1, wherein the release agent is selected from a polyolefin wax or a higher fatty acid or a higher fatty acid salt having a melting point lower than the surface temperature of the dryer having the highest temperature. Claim 1 or Claim 2
A method for producing the anti-counterfeit paper with thread as described above.