JPH0538000U - Magnetic threaded threaded paper - Google Patents

Abstract

(57) [Summary] [Purpose] A threaded paper containing a magnetic thread, which is extremely easy to recover broke and waste paper and can be suitably used for applications such as anti-counterfeit paper and magnetic recording media. [Structure] On a polyvinyl alcohol film having a hot water dissolution temperature of 80 ° C., a magnetic recording layer was formed using a vinyl acetate / maleic acid resin as a binder as a resin soluble in alkaline hot water at the above temperature to form a magnetic recording layer of 5 mm. The thread slit in the width was made into a paper layer to obtain a paper with yarn having a basis weight of 150 g / m ² . Recovery of papermaking fibers from broke and waste paper is performed by keeping the temperature in a recovery device and using alkali in combination.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thread-containing paper containing a magnetic thread, which can be suitably used for applications such as anti-counterfeit paper and magnetic recording media. More specifically, a magnetic thread is fed to a predetermined position between the paper layers with a paper machine, and the thread-containing paper is made into a thread-containing paper that is extremely easy to recover the papermaking fibers from the damaged paper and waste paper. It is related.

[0002]

[Prior Art]

 Banknotes, checks, stock certificates, passports, cards, etc. have various security measures in place to prevent unauthorized alteration or forgery. One example is a paper layer in which a filamentous material is incorporated (called paper with thread). Making threaded paper requires a high level of technology, and if it is used for paper such as banknotes and checks, safety alone will be dramatically improved. Conventionally, this kind of thread-containing paper is produced by a method of producing with a Fourdrinier paper machine, as described in, for example, Japanese Patent Publication No. 52-48660, JP-A No. 51-130308, and JP-A No. 51-130309. As described in JP-A-48-75808, a method of manufacturing with a cylinder paper machine has been proposed.

On the other hand, as filaments to be drawn into the paper layer, weaving threads, metal foil slit into narrow widths, metal vapor deposition on a synthetic resin film, and the surface of which is coated with transparent or colored resin Japanese Patent Application Laid-Open No. 56-151598, Japanese Patent Application Laid-Open No. 56-151598, those obtained by slitting a magnetic coating film (hereinafter referred to as a magnetic thread), and giving a filamentous material with special physical and chemical characteristics. Various proposals have been made in JP-A-58-54099, JP-A-63-182497, British Patent 417488, British Patent 1127043, US Pat. No. 2143406, US Pat.

Conventionally, these thread-containing papers have been unsatisfactory from the viewpoint of recycling broke and waste paper. It is inevitable that waste paper will be generated during papermaking. Also, when used paper (waste paper) is collected and papermaking fibers are recovered and reused from these, the above filaments can be efficiently used from waste or waste paper. Needs to be removed. Normally, spoiled paper and waste paper are put into a beater or pulper together with water, and the mixture is stirred by stirring to make a slurry and then the filaments are removed by a screen or a cleaner, but the filaments are complicatedly entangled during the circulation, so the removal is remarkable. It was difficult. Therefore, the current situation is that broke and waste paper are incinerated.

[0005]

[Problems to be solved by the device]

Among the above-mentioned thread-containing papers, the present inventors focused on the thread-containing paper containing the magnetic thread, and examined an efficient method for treating damaged paper and waste paper. To obtain a magnetic thread, a synthetic resin film may be coated with magnetic paint and slit into a narrow width. Currently, magnetic tapes have magnetic properties such as γ-Fe ₂ O ₃ , Fe ₃ O ₄ , CrO ₂ , Co-adhered γFe ₂ O ₃ , metal powder (acicular iron powder), and barium ferrite (BaO.6Fe ₂ O ₃ ). The powder is mixed with a binder such as polyurethane, polyvinyl chloride-vinyl acetate copolymer, polyacrylic acid ester alone or a mixture, and as a cross-linking agent, polyisocyanate, amine and the like, and if necessary, a dispersant, Reverse coating, gravure coater, roll coater, bar coater, etc. for magnetic paints that use surfactants, coupling agents, antistatic agents such as carbon black, friction resistance improvers such as alumina fine powder, lubricants such as silicone, etc. It is manufactured by applying it to the surface of the polyester film using a well-known coater or the like.

The present inventors first obtained a magnetic tape raw material after applying a magnetic coating, slitting this to a width of 3 mm, producing a thread-containing paper containing magnetic threads with a Fourdrinier paper machine, and collecting pulp. The test was carried out, but only completely unsatisfactory results were obtained. That is, the magnetic threads were complicatedly entangled with each other in the pulper or beater or the waste paper collecting device, or a part of the magnetic threads was broken into pieces, and it was extremely difficult to remove them. As described above, the polyester film is used for the base film of the magnetic tape because it has excellent strength even if it is thin, and also has excellent weather resistance, chemical resistance, and water resistance. This is because the magnetic paint also has excellent water resistance.

The present inventors have made various studies based on the idea that the above problems can be solved by using a film having a hot water-soluble property as the base film. That is, various studies were carried out based on the idea that it is possible to recover papermaking fibers from spoiled paper and waste paper very easily if the water used for heating is heated by a method such as steam blowing to dissolve the film forming the threads. .. In this case, the hot water-soluble film has the following properties: the film does not dissolve or become excessively swelled by water during web formation (wet part) on a paper machine, and the wet paper drying zone ( It is necessary that the film does not cause any practically problematic deformation with a multi-cylinder cylinder dryer or Yankee dryer, and that the film is dissolved with hot water during recovery.

As a result of the study, it was found that a hot water-soluble film having a hot water dissolution temperature of 60 to 80 ° C. can be used to make paper without any problems, and a base film can be easily dissolved with a beater or a pulper. I found it. Based on this finding, the present inventors have used a PVA film having a hot water dissolution temperature of 75 ° C. as a hot water-soluble film, and applying a magnetic paint for magnetic tape to this to process it into a thread, Paper was manufactured and a pulp recovery test was conducted. However, according to this method, although the PVA film was dissolved, fragments of the magnetic coating layer applied on the surface remained, and another problem that the removal was extremely difficult occurred. The reason for this is that the resin used in the magnetic paint has excellent strength and water resistance as described above, and does not easily dissolve in hot water. The present invention has been made in view of such a background, and an object of the present invention is to develop a thread-containing paper containing a magnetic thread capable of recovering papermaking fibers from spoiled paper and waste paper.

[Means for Solving the Problems]

The present inventors cannot completely solve the above-mentioned problems by using an alkali-soluble resin as the resin used for the magnetic paint and by using an alkaline substance together when treating broke or waste paper. Further consideration was given to the idea that there might be. As a result, this method found a remarkable effect that the intended purpose could be completely achieved, and completed the present invention. The gist of the present invention will be described with reference to the drawings. A magnetic recording layer 2 is formed on a film 1 having a hot water melting temperature of 60 to 80 ° C. using a resin soluble in alkaline hot water at the above temperature as a binder. The reason is that a thread slit into a narrow width is made into the paper layer 3 to obtain a thread-containing paper containing a magnetic thread.

It is known to use alkaline substances such as sodium hydroxide, sodium carbonate and slaked lime together when recovering broke and waste paper. These are added for the purpose of saponifying the ink vehicle and the resin sizing agent and facilitating their removal, but they have never been used for the purpose of the present invention.

There are various water-soluble films, for example, starch-based, methyl cellulose-based, carboxylated methyl cellulose-based, hydroxyethyl cellulose-based, polyvinyl alcohol-based, polyvinyl pyrrolidone-based, vinyl ethyl ether-maleic anhydride copolymer-based, polyacrylic. Examples thereof include acid-based films and polyethylene oxide-based films. The film used in the present invention needs to be dissolved in hot water at 60 to 80 ° C., and the above water-soluble polymers included in this range, functional groups introduced therein, and water-proofing agents may be added. Those having a higher melting temperature can be used in combination. In the present invention, it is preferable to use polyvinyl alcohol because it is relatively inexpensive, easily available, and has appropriate physical strength. The solubility of polyvinyl alcohol in water is largely governed by the degree of polymerization and the degree of saponification, especially the degree of saponification. For example, water having a saponification degree of 88% or less can be completely dissolved even in water at 20 ° C., but hot water at about 50 ° C. can be dissolved at a saponification degree of 97%, and it can be completely dissolved at about 80 ° C. for complete saponification. When a film that melts at less than 60 ° C is threaded and made into paper, the thread dissolves or swells excessively in the drying zone of the paper machine, and it becomes impossible to maintain the thread-like shape. However, it is extremely difficult and dangerous to bring the slurry to a temperature of 80 ° C. or higher during recovery, so the melting temperature must be within the above range. The thickness of the hot water-soluble film is usually 10 to 100 μm.

In the present invention, the hot water-soluble film is coated with a magnetic paint mainly composed of a binder soluble in hot alkali and magnetic powder. As the resin soluble in the hot alkaline aqueous solution, vinyl acetate-maleic acid copolymer resin, polyester resin, maleic anhydride-acrylic acid ester copolymer resin, styrene-acrylic resin modified with carboxyl group, maleic acid having high acidity Resin, phthalic acid resin, ionomer resin, polycarbonate resin, polyacetal resin, ionomer resin, nitrocellulose resin, acetylcellulose resin, phenol resin, melamine resin, urea resin, casein resin, shellac Among the black resins, those which do not dissolve in hot water in the temperature range of 60 to 80 ° C. but do not dissolve in hot alkaline water for the first time are selected and used. When an alkali agent is added to recover papermaking fibers from broke or waste paper, the concentration of alkali is usually in the range of 0.01 to 0.5% by weight. Therefore, the resin soluble in the hot alkaline aqueous solution used in the present invention is preferably one that dissolves in this concentration range.

The magnetic powder is the above-mentioned γ-Fe.₂O₃, Fe₃O_Four, CrO₂, Co-deposited γFe₂O ₃ , Metal powder (acicular iron powder), barium ferrite (BaO ・ 6Fe)₂O₃) Etc. can be used. The mixing ratio of the magnetic powder and the binder is 1: 1 to 10: 1 by dry weight, preferably 2: 1 to 7: 1, and the coating thickness is usually in the range of 10 to 20 μm. The magnetic paint is manufactured by dispersing magnetic powder using an appropriate dispersing machine and mixing a binder with the magnetic powder. At this time, a cross-linking agent, a dispersant, a surfactant, a coupling agent, an antistatic agent such as carbon black can be used together with the coating material. It is preferable to prepare the coating material in a solvent system in order to prevent deformation of the hot water-soluble film during coating.

The coating material thus prepared is applied to the hot water-soluble film using a known reverse coater, gravure coater, roll coater, bar coater or the like. At this time, when the coating material has fluidity immediately after being applied, it may be appropriately passed through permanent magnets to orient the magnetic powder. This can improve the magnetic characteristics. The magnetic paint may be provided on the entire surface of the base film or partially. When it is partially provided, for example, it is manufactured by engraving a large number of grooves having different widths on a gravure cylinder by bar code engraving and applying (printing) a paint.

Since the magnetic powder generally has a hue close to black, a colored layer can be further provided on the magnetic layer when a magnetic thread of another hue is required. The colored layer is formed by applying an opaque coating material in which a white pigment such as titanium oxide or a coloring pigment is mixed with the above-mentioned alkali-soluble binder. The colored layer can be formed on the back surface of the base film, or can be formed in different colors on the front and back sides.

In the present invention, the processed film is then slit using a micro slitter to produce a thread. Although the slit width varies depending on the required performance, it is usually 0.5 to 10 mm width. Then, the thread is made into a paper by using a known thread-containing paper manufacturing method. One of the purposes of incorporating the magnetic thread is to enable the magnetic head to read and write information. Ideally, the magnetic head and the magnetic coating layer should be in contact with each other, because the reading and writing accuracy of information is improved. In the present invention, since the magnetic thread is made in the paper layer, the magnetic coating layer and the magnetic head do not come into direct contact with each other. For the purpose of providing anti-counterfeiting ability by reading magnetic information, the present inventors have a problem in reading and writing information even if there is a paper layer of up to about 200 μm on the magnetic recording layer, depending on the recording density. I confirmed that I could do without it.

In the present invention, the paper with thread thus produced may be further provided with a clay coating layer or a resin coating layer, and the surface may be treated with a super calender to improve the surface smoothness. It is done appropriately.

The magnetic thread-containing paper of the present invention is manufactured by the method described above, and the papermaking fibers are recovered from the spoiled paper and the waste paper by using a pulper or a beater or a known wastepaper recovery device. It can be carried out. The method is to disintegrate broke or waste paper into water or hot water with a pulper, beater or waste paper recovery device. Then, a predetermined alkaline agent is added, and the mixture is stirred and flowed at a predetermined temperature. During this time, the hot water-soluble film dissolves, and the binder in the magnetic recording layer also dissolves. Although the magnetic powder remains undissolved, it has a fine shape and a large specific gravity, so it is necessary to separate it with a screen, separate it by sedimentation, centrifuge it, separate it with a magnet, or It can be easily removed by combination.

[0019]

【Example】

Next, the present invention will be specifically described with reference to examples, but the present invention is not limited to these. Example. 1 100 parts by weight of barium ferrite magnetic powder having a coercive force of 3000 oersted (dry weight part, the same applies hereinafter) to a biaxially oriented polyvinyl alcohol film having a thickness of 25 μm and a hot water dissolution temperature of 80 ° C. as a binder, vinyl acetate / maleic acid A coating containing 30 parts by weight of a resin (commercial name Nikka Coat HS-M, manufactured by Nippon Kako Paint Co., Ltd.) was used, and was coated with a gravure roll coater to a thickness of 15 μm (dry thickness). Then, using a micro slitter, it was slit into a width of 5 mm to obtain a magnetic thread. Next, 30 parts by weight of NBKP and 70 parts by weight of LBKP were added to 350 ml of C.I. S. F. Then, add a sizing agent (trade name: Size Pine E, manufactured by Arakawa Hayashi Chemical Co., Ltd.) to pulp solids content of 1% and starch (trade name: Amicol 602, Nippon Starch Manufacturing Co., Ltd.) to 1% of solids content, The pH was adjusted to 4.5 with aluminum sulfate. In the process of making a 1 m width paper with a Fourdrinier paper machine at a dry weight of 150 g / m ² , the above-mentioned sleds are evenly spaced between 10 paper layers, and the thread is placed in the middle of the paper thickness direction. It is. The method was based on the method of Japanese Patent Application No. 50-56580 previously filed by the applicant of this utility model, that is, the method of supplying the thread between the paper layers through the cylindrical guide nozzle at the early stage of the wet part. Drying was performed with a multi-cylinder cylinder dryer. The high-concentration pulper was charged with 5 parts by weight of the thread-containing paper thus produced, 95 parts by weight of water (that is, a pulp concentration of 5%), and 0.1 parts by weight of caustic soda, and the mixture was rotated while blowing live steam at a temperature of 70%. When the temperature was raised to ℃, the base film forming the thread and the binder of the magnetic coating layer were completely dissolved. The magnetic powder remaining without being dissolved could be removed by diluting the slurry and separating it by sedimentation.

Example. 40 parts by weight of NBKP and 60 parts by weight of LBKP were mixed with 400 ml of C.I. S. F. Then, add a sizing agent (trade name: Size Pine E, manufactured by Arakawa Hayashi Chemical Co., Ltd.) to 1% solids of pulp and starch (trade name: Amicol 602, manufactured by Nippon Starch Co., Ltd.) to 1% solids of pulp, and add aluminum sulfate. PH was adjusted to 4.5. At the time of two-layer paper making with a cylinder paper machine (40 g / m ^{2 in} the first tank, 1 m width paper in the second tank 80 g / m ² ), the same magnetic threads as in Example 1 were equally spaced. 10 papers were included. Drying was performed with a multi-cylinder cylinder dryer. A high-concentration pulper was charged with 5 parts by weight of the paper thus prepared, 95 parts by weight of water (pulp concentration 5%), 0.15 parts by weight of caustic soda, and the mixture was rotated while blowing live steam to a temperature of 70 ° C. When raised, the base film forming the thread and the binder of the magnetic coating layer were completely dissolved. The magnetic powder remaining without being dissolved could be removed by centrifuging the slurry with a Centric cleaner.

[0021]

[Effect of the device]

 The present invention is configured as described above and has the following excellent features. The magnetic thread-containing threaded paper of the present invention requires extremely high technology for its production and has excellent anti-counterfeiting ability. In addition, the anti-counterfeiting ability can be further improved by using it together with other anti-counterfeiting means such as “watermark”. Therefore, it can be suitably used for the purpose of preventing forgery of banknotes, checks, stock certificates, passports, admission tickets, magnetic cards, magnetic tickets and the like. It can read and write magnetic information. Recovery of papermaking fibers from broke and wastepaper is extremely easy. Compared to polyester film based magnetic threads, the inventive threads swell slightly in the presence of water and can be flattened in the press part of a paper machine. Therefore, when the rolled paper is manufactured by winding, distortion is locally concentrated (thread insertion part) even if the winding diameter is large, and wrinkles do not reduce workability. When a perforation is inserted at a right angle to the thread insertion direction and used, for example, as a railroad ticket or an admission ticket, and the stubs are torn along the perforation, the thread does not slip out of the cut.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a thread-containing paper with a magnetic thread according to the present invention, in which a thread portion is enlarged and displayed.

[Explanation of symbols]

 1 Hot water soluble film 2 Magnetic recording layer 3 Paper layer

Claims (1)

[Scope of utility model registration request] 1. A thread having slits formed in a narrow width is formed on a film 1 having a hot water dissolution temperature of 60 to 80 ° C. by forming a magnetic recording layer 2 using a resin soluble in alkaline hot water at the above temperature as a binder. A thread-containing paper containing a magnetic thread, characterized in that it is made into paper layer 3.