JP2004001258A - Magnetic recording paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic recording paper which shows superb magnetic recording properties, improved applicability for removing tailings generated by the punching of a score part by a rotary die cutter and folding process, improved running properties and is almost free from surface irregularities. <P>SOLUTION: This magnetic recording paper is obtained by punching a magnetic recording paper with a magnetic recording layer composed mainly of a magnetic material compound and a binder formed in a stripe fashion on at least one of the sides of a paper support using 50 wt% or higher of broadleaf tree pulp with the use of the rotary die cutter. The paper is characterized in that the following conditions (l) to (3) are satisfied. (l) The interlaminar strength of the paper support falls within the range of 50 to l20 N/m. (2) The density of the paper support falls within the range of 0.75 to 0.95 g/cm<SP>3</SP>. (3) The basis weight of the paper support falls within the range of 70 to 250 g/m<SP>2</SP>. (4) The ash of the paper support falls within the range of 0.3 to 7%. <P>COPYRIGHT: (C)2004,JPO

Description

【００５７】
（ボコツキの評価）
上記サンプルを、塗工後２０分以内に下記の測定を行った。塗工紙の流れ方向を長辺として２００ｍｍ×８０ｍｍの大きさにサンプルを調整し、水平な台上にサンプルを静置する。静置したサンプルの四辺の外観を４段階で評価し、さらにボコツキによって最も台から浮かび上がった箇所の高さを物差しで測定した。ボコツキによって紙が浮かび上がることなく、数値が小さい方が良好である。
（評価基準）
◎　：　ボコツキがほとんどない。
○　：　ボコツキが僅かに見られる。
△　：　ボコツキが見られる。
×　：　ボコツキが激しく見られる。
【００５８】
（打抜き不良の評価）
上記サンプルを幅１０８ｍｍ×流れ２０００ｍ作成し、ロータリーダイカッターでスピード１２０ｍ／分で図３に示したようにスコアー部（溝部１１，１２）の打抜き粕取りを実施し、打抜き不良個数を測定した。数値が小さい方が、ロータリーダイカッターの打抜き適性が良好である。
【００５９】
（走行性の評価）
上記サンプルを幅１０８ｍｍ×流れ２０００ｍ作成し、ロータリーダイカッターでスピード１２０ｍ／分で図３に示したようにスコアー部（溝部１１，１２）の打抜き粕取りを実施し、その時の走行性を４段階で評価した。
（評価基準）
◎　：　紙のバタツキがなく、走行性が非常に良い。
○　：　紙のバタツキが僅かに見られ、走行性が良い。
△　：　紙のバタツキが見られ、走行性があまり良くない。
×　：　紙のバタツキが激しく見られ、走行性が非常に悪い。
【００６０】
（折り加工性の評価）
上記サンプルを幅１０８ｍｍ×流れ２０００ｍ作成し、ロータリーダイカッターでスピード１２０ｍ／分で図３に示したようにスコアー部（溝部１１，１２）の打抜き粕取りを実施し、流れ方向３枚ずつ折り返し、その時の折り加工性を２段階で評価した。
（評価基準）
○　：　折り加工に支障がない。
×　：　折り加工に支障がある。
【００６１】
（磁気部と非磁気部の厚さの差）
上記サンプルの磁気部と非磁気部の厚さについて、ＪＩＳＰ８１１８に準拠して測定した。
【００６２】
（磁気記録特性）
磁気記録特性（保磁力、残留磁束密度、角型比）については、振動試料型磁力計（ＶＳＭ）で測定した。
【００６３】
（出力波形）
出力波形については、日置メモリハイコーダで測定した。
○　：　出力波形に歪がなく、読取に支障がない。
×　：　出力波形に歪があり、読取に支障がある。
【００６４】
【発明の効果】
本発明は、磁気記録性に優れ、ボコツキの少なく、かつロータリーダイカッターでのスコアー部の打抜き粕取り適性、走行性、折り加工適性を改良した磁気記録紙を提供するものである。
【図面の簡単な説明】
【図１】原紙に磁気記録層をストライプ塗工した例の一部の平面図。
【図２】磁気駐車券をダイカットするロータリーダイカッタ装置の構成図。
【図３】（１）ロータリーダイカッター装置により溝１１が打ち抜かれた状態の用紙を示す図、（２）同装置により更に溝１２が打ち抜かれた状態の用紙を示す図。
【符号の説明】
１、２　　　ロータリーダイカッター[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a magnetic recording paper using a magnetic action of a magnetic compound.
[0002]
[Prior art]
The magnetic recording paper is particularly used for magnetic tickets generally used for tickets, coupons, commuter passes, parking tickets, and the like. The magnetic ticket is provided with a magnetic recording layer on one side of a support and a recording layer of a thermosensitive recording type, an electrophotographic type, an electrostatic recording type, a diazo recording type, a chelating type or the like provided on the other side as appropriate.
[0003]
Examples of a method for providing a magnetic recording layer include a coating method, a transfer method, a vacuum deposition method, a sputtering method, and a gas phase reaction method. When a magnetic recording layer is provided for use in tickets and the like, a coating method is generally used from the viewpoint of not performing high-performance recording and economy.
[0004]
When the coating liquid used in the coating method is classified by solvent, it is generally aqueous and solvent based, such as toluene, xylene, and methyl ethyl ketone, and cured by ionizing radiation such as ultraviolet rays and electron beams without using a solvent. It is roughly classified into three types such as a solvent-free type using a resin that can be used.
[0005]
In this field, it is common to apply a magnetic recording layer to the entire surface of a support, but a magnetic recording layer is provided only in a portion requiring magnetic recording, and a recording layer of another recording method is provided in a blank portion. A recording medium is often used. As a general example, as disclosed in JP-A-48-25503 and JP-A-51-65606, a magnetic recording layer is partially printed or coated in a stripe shape or the like. Provision is being made.
[0006]
If the magnetic recording layer is formed by applying and drying the coating liquid for magnetic recording on the paper support entirely or partially with a printing machine or a coating machine, there is a problem that the magnetic recording paper is uneven. In particular, when the magnetic recording layer is partially formed, the paper support portion under the magnetic recording layer shrinks from the uncoated portion, and there is a problem that the paper support is strongly generated.
[0007]
Further, in a paper sheet provided with a magnetic layer in a stripe shape, since the magnetic layer is partially raised, when the paper sheet before recording is mounted in a recording machine in a stacked manner, it is also called a stacking property. The piled up bills cause the tilt running property to be poor. In other words, even if the swelling of the magnetic recording portion (the step between the base paper surface and the recording layer surface) is 20 microns per sheet (usually the thickness of the magnetic recording layer is 10-30 microns), 20 mm when 1000 sheets are stacked. This can cause tilting.
[0008]
In order to eliminate this step, a method of providing a magnetic layer after carrying out a strong super calendering process on only the stripe portion or partially removing the paper in advance has been implemented, but it increases the cost or accurately applies it to the concave portion Is difficult. In addition, it is preferable from the viewpoint of productivity cost that a strong super calender is performed after the magnetic layer is provided on the paper. Affect.
[0009]
In addition, since the user applies the paper on which the magnetism is applied in a stripe shape according to the individual purpose, it is necessary to cut the paper into a predetermined size in advance. As a method, there are automatic punching and rotary die cutter punching. Since automatic punching is performed by temporarily stopping during the operation and punching out, speed is not high and productivity is poor. Further, in a paper sheet provided with a magnetic layer in the form of a stripe, the magnetic layer partially rises and undulates, so that there is a disadvantage that cutting defects due to dimensional deviation are likely to occur.
[0010]
[Problems to be solved by the invention]
The present invention is to provide a magnetic recording paper which is excellent in magnetic recording properties, has less unevenness, and has improved suitability for removing punched residue at a score portion by a rotary die cutter, running properties, and folding workability.
[0011]
[Means for Solving the Problems]
In the magnetic recording paper according to the present invention, a magnetic recording layer containing a magnetic compound and a binder as main components is provided in a stripe form on at least one surface of a paper support using 50% by weight or more of hardwood pulp. Magnetic recording paper obtained by punching the magnetic recording paper by a rotary die cutter, wherein the magnetic recording paper satisfies the following conditions (1) to (4).
(1) The interlayer strength (based on JISP8139: 1998) of the paper support is in the range of 50 to 120 N / m.
(2) The density of the paper support (based on JISP8118: 1998) is 0.75 to 0.95 g / cm. ³ Range.
(3) The paper support has a rice tsubo (based on JISP8124: 1998) of 70 to 250 g / m. ² Range.
(4) The ash content of the paper support (based on JISP8128: 1998) is in the range of 0.3 to 7%.
The magnetic recording paper according to the present invention further has a magnetic coating amount of the stripe portion of 20 to 50 g / m2 as a magnetic material. ² It is characterized by being within the range.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
As the pulp of the paper support of the present invention, hardwood pulp (hereinafter referred to as L material) is preferable. As for the suitability for removing punched residue at the score portion by a rotary die cutter, if softwood pulp (hereinafter referred to as N material), which is a long fiber, is included, fiber entanglement becomes stronger and punching becomes worse. It is preferable that the N material is not contained as much as possible, and the range of the N material blending is 50% by weight or less. Preferably, the range is 30% by weight or less.
[0013]
The interlayer strength (according to JISP8139) of the paper support is preferably 50 to 120 N / m. If it is less than 50 N / m, sufficient paper strength cannot be obtained. If it is larger than 120 N / m, the suitability for punching with a rotary die cutter will be poor. Examples of a method for controlling the interlayer strength include appropriately selecting the type of pulp of the paper support and internal additives such as a sizing agent, a paper strength agent, and a waterproofing agent. Above all, a paper-strength enhancer such as dialdehyde starch, epoxidized polyamidoamine, melamine-formaldehyde resin, methylolated polyacrylamide, polyacrylamide, etc. is internally added in an amount of about 0.1 to 10% by weight based on the total solid content of the paper support. Is preferably used.
[0014]
The density of the paper support is 0.75 to 0.95 g / cm ³ In order to perform the control, a conventionally known method is used. For example, a method of controlling the freeness of the pulp at the time of papermaking, controlling a super calender condition, and the like are employed. As a means for controlling the fiber orientation of the paper, a method of controlling a jet wire ratio at the time of papermaking, a method of controlling pressing conditions, and the like are employed. In particular, it is preferable that the jet wire ratio at the time of papermaking be about 0.90 to 1.05.
[0015]
The fiber orientation of the paper support is about 1.1 to 1.7 in the ratio of length to width determined by the method described in TAPPIT481. Among them, 1.2 to 1.6 is preferable. Here, the vertical direction indicates the flow direction of the paper machine, and the horizontal direction indicates the direction perpendicular to the flow direction of the paper machine.
[0016]
Further, the density of the paper support is 0.75 to 0.95 g / cm. ³ By using a base paper, the magnetic recording layer is partially provided and then gross calendering is applied, so that the cushioning properties are good, the flatness is achieved, and the thickness of the magnetic portion and the non-magnetic portion is almost uniform. The running property and the punching suitability with a rotary die cutter are improved by reducing the stiffness of the material. 0.75g / cm ³ If it is smaller, the bonding between the fibers is not sufficient, and the strength as paper cannot be obtained. 0.95g / cm ³ If it is larger, expansion and contraction in a wet state becomes a problem.
[0017]
The greater the freeness of the pulp used in the present invention, the better. Preferably, it is about 350 to 450. If it is smaller than 350, expansion and contraction in a wet state becomes large. On the other hand, if it is larger than 450, there is a problem that the bonding between the fibers is not sufficient and the strength as paper cannot be obtained.
[0018]
Further, as a method for suppressing the expansion and contraction of the paper, there are methods such as increasing the fiber length of the pulp and adding a sizing agent, a paper strength enhancer, and synthetic pulp in terms of composition. In addition, a conventionally known method can be used.
Specifically, for example, a method in which a hydroxyl group, which is a main component of pulp, is crosslinked with a curing agent to lower the affinity for water, a method in which synthetic fibers and pulp are mixed, and the like are exemplified.
[0019]
The basis weight of the base paper used in the present invention is 70 g / m ² The above is necessary. 70 g / m ² If it is less than this, the rigidity is low and the portability as a card is inferior, which is not preferable. In addition, the folding process after punching with a rotary die cutter becomes worse. More preferably, 100 to 250 g / m ² Is good.
[0020]
The ash content (according to JISP8128) of the paper support is preferably 0.3 to 7%. If it is less than 0.3%, the printability will be poor and the magnetic properties will be poor. On the other hand, if it is larger than 7%, the cutter blade of the rotary die cutter will be severely deteriorated, the service life will be shortened, the cross section of the cut will be poor, and the powder will drop off. Become. Talc is the most popular ash filler in acid paper, and calcium carbonate is mainly used in neutral paper. Other examples include clay, titanium dioxide, and barium sulfate. Fillers increase the paper's tenacity, ie, reduce its bulk, with its addition. The addition amount is kept to the minimum necessary, and it is preferably used that 0.3 to 7% of the total solid content of the paper support is internally added. More preferably, 1 to 5% is good.
[0021]
The magnetic recording paint and the coating method used in the present invention will be described.
The magnetic recording layer contains magnetic powder and a binder as main components. As the magnetic powder, γ-iron oxide, cobalt-modified γ-iron oxide, barium ferrite, chromium oxide, strontium ferrite and the like can be used. Among them, Oersted barium ferrite and strontium ferrite having an Oersted of 1500 to 5000 are preferable so that the magnetic recording information is not erased by ordinary magnetism.
[0022]
Further, any conventionally known binder may be used. Among them, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, methyl acrylate-butadiene copolymer, vinyl chloride, emulsion binders such as polyurethane, water resistance, abrasion resistance, flexibility and the like. preferable.
[0023]
In addition, as binders, starches, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, polyvinyl alcohol, modified polyvinyl alcohol, styrene-maleic anhydride copolymer, ethylene-maleic anhydride copolymer, etc. Can be used.
[0024]
In addition, when preparing the magnetic paint, if necessary, dispersants such as polyacrylates, polycarboxylates, styrene maleate, additives such as polyethylene oxide, waxes, carbon graphite, ammonium zirconium carbonate, epichlorohydrin, glyoxal, etc. Is used as appropriate
[0025]
As a method of applying the magnetic recording layer of the present invention, using a reverse coater, a bar coater, a blade coater, a gravure coater, a lip coater, a die coater, etc., modified so as to partially apply the magnetic recording layer paint. And the coated amount after drying is 20 to 50 g / m ² It is formed by coating or printing on a base paper so that Among them, preferably 25 to 40 g / m ² However, high magnetic recording properties can be obtained.
[0026]
In the case of stripe coating, the coating width can be set in a range of 3 mm to 50 mm. If it is thinner than 3 mm, there is a problem in suitability for magnetic recording, and if it is wider than 50 mm, there is a practical problem. FIG. 1 shows a partial plan view of an example of the stripe coating.
[0027]
By using the above-mentioned specific paper support, by applying the aqueous magnetic recording layer coating solution to the paper support in the form of a stripe when strongly coated, the stripe magnetic recording layer is applied, By performing the super calendering, an effect having excellent recording characteristics and anti-bumpiness can be obtained.
[0028]
In the magnetic recording medium of the present invention, a conventionally known recording layer may be provided. For example, a magnetic recording layer is partially provided on one surface of a support, and an arbitrary recording layer including a heat-sensitive recording layer, an ink jet recording layer, and a thermal transfer layer is formed on the magnetic recording layer or on the opposite surface. Layers can be provided. However, it is not limited to the recording layer described here.
[0029]
The cutting method of the magnetic parking ticket of the present invention is punching of a rotary die cutter. Conventionally, automatic cutting of parking tickets has generally been performed by automatic punching. However, since the operation is performed by temporarily stopping and punching during operation, speed is not obtained and productivity is poor. Further, in a paper sheet provided with a magnetic layer in the form of a stripe, the magnetic layer partially rises and undulates, so that there is a disadvantage that cutting defects due to dimensional deviation are likely to occur.
[0030]
Meanwhile, a method for cutting a magnetic parking ticket according to the present invention will be described with reference to FIG. FIG. 2 is a configuration diagram of a rotary die cutter device for die-cutting a magnetic parking ticket. The magnetic stripe coated paper 5 wound from the paper roll 3 is conveyed to the rotary die cutter 1 through the paper roll 4 in the direction indicated by the arrow A, and a plurality of grooves 11 are punched out first. FIG. 3A shows the sheet in which the plurality of grooves 11 have been punched. The direction indicated by the arrow B in the figure is the paper transport direction. Subsequently, a plurality of grooves 12 are punched by the rotary die cutter 2 so as to partially overlap the grooves 11. FIG. 3B shows a sheet in which the groove 12 is punched after the groove 11. Next, slit processing is performed along a line shown by a dotted line in FIG. In such a state, a part of the groove is punched out, and processing such as printing is performed as needed, and the groove is then delivered to the user as a magnetic ticket.
[0031]
In these rotary die cutters, male and female circular dies are attached to respective cylinders, and are rotated like a rotary printing machine to punch out sheets. The rotary die cutter has a very high processing speed and good productivity. Also, with regard to the waving of the paper sheet, the roll presser is effective at the time of cutting, and the dimensional deviation is small and the cutting defect is small compared to the automatic punching.
Further, rotary die cutters include a hard cut type and a soft cut type depending on the surface hardness of the mating cylinder of the cylinder to which the die is attached. The cutting of the magnetic parking ticket of the present invention is preferably of a hard cut type.
[0032]
【Example】
Hereinafter, the present invention will be described in more detail with reference to Examples, but of course, the scope of the present invention is not limited thereto. In the examples, “parts” and “%” indicate “parts by weight” and “% by weight”, respectively, unless otherwise specified.
[0033]
<Example 1>
・ Preparation of magnetic substance dispersion
100 parts of barium ferrite (MC127, manufactured by Toda Kogyo Co., Ltd.), 2 parts of sodium polyacrylate (Aron T-40, 40% aqueous solution manufactured by Toagosei Co., Ltd.), 5 parts of styrene-maleic acid copolymer (polymalon 385, manufactured by Arakawa Chemical Industry Co., Ltd., 25% aqueous solution) and water so as to have a solid content of 50% to prepare a pre-dispersion, and then disperse the pre-dispersion with a sand grinder. Then, a magnetic substance dispersion liquid was prepared.
[0034]
・ Preparation of coating solution for magnetic recording layer
To the above dispersion was added 30 parts of a soft urethane emulsion (Izelux S-3020N, manufactured by Hodogaya Chemical Co., Ltd., 37% aqueous solution) in terms of solids to prepare a magnetic recording layer coating liquid having a solids concentration of 46.4%. did.
[0035]
・ Preparation of paper support
A raw material of NBKP 0% and LBKP 100% was beaten to 450 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa Chemical Industry Co., Ltd.) was added at 5.3% by weight of dry paper, and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) was added as an internal filler at 4.0% by dry paper weight. The pulp slurry was subjected to papermaking by a fourdrinier paper machine and subjected to a super calendering and 2-nip linear pressure of 100 kg / cm, and the basis weight was 160.0 g / m2. ² , Density 0.83g / cm ³ Was obtained.
[0036]
・ Preparation of magnetic recording paper
One surface of the paper support was coated with a magnetic recording layer coating solution with a width of 6.5 mm in the flow direction (longitudinal direction) of the paper support by a lip coater. 30g / m in solid content ² It was coated and dried at 110 ° C. to obtain the magnetic recording paper of Example 1.
[0037]
<Example 2>
A magnetic recording paper was obtained in the same manner as in Example 1, except that the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1.
[0038]
・ Preparation of paper support
A raw material containing 20% of NBKP and 80% of LBKP was beaten to 400 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa Chemical Industry Co., Ltd.) was added at 5.3% by weight of dry paper, and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) was added as an internal filler at 4.0% by dry paper weight. The pulp slurry was subjected to papermaking by a fourdrinier paper machine and subjected to a super calendering and 2-nip linear pressure of 100 kg / cm, and the basis weight was 160.0 g / m2. ² , Density 0.83g / cm ³ Was obtained.
[0039]
<Example 3>
A magnetic recording paper was obtained in the same manner as in Example 1, except that the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1.
[0040]
・ Preparation of paper support
A raw material of 20% NBKP and 80% LBKP was beaten to 350 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa) was used as an internal paper strength enhancer. Pulp added with 5.3% by weight of dry paper (Chemical Industry Co., Ltd.) and 4.0% by weight of talc (THF90, manufactured by Fukuoka Talc Kogyosho) as an internal filler. The slurry is subjected to paper making by a fourdrinier type paper machine and subjected to a super calendering 2 nip linear pressure of 150 kg / cm and a basis weight of 160.0 g / m. ² , Density 0.90g / cm ³ Was obtained.
[0041]
<Example 4>
A magnetic recording paper was obtained in the same manner as in Example 1, except that the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1.
[0042]
・ Preparation of paper support
A raw material of 20% NBKP and 80% LBKP was beaten to 350 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa) was used as an internal paper strength enhancer. Pulp added with 8.3% by weight of dry paper (Chemical Industry Co., Ltd.) and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) as an internal filler at 4.0% by dry paper weight. The slurry was subjected to paper making by a fourdrinier type paper machine and subjected to a treatment with a super calender and a 2-nip linear pressure of 100 kg / cm, and a basis weight of 160.0 g / m. ² , Density 0.83g / cm ³ Was obtained.
[0043]
<Example 5>
A magnetic recording paper was obtained in the same manner as in Example 2, except that the following magnetic recording layer coating liquid was used instead of the magnetic recording layer coating liquid used in the production of the magnetic recording paper of Example 2.
[0044]
・ Preparation of coating solution for magnetic recording layer
100 parts of barium ferrite (MC127, manufactured by Toda Kogyo), 10 parts of vinyl chloride resin containing metal sulfonic acid salt (MR-110, manufactured by Nippon Zeon), 20 parts of polyurethane resin (Nipporan N-2304, manufactured by Nippon Polyurethane Industry), carbon 3 parts of black, 60 parts of cyclohexanone, 60 parts of methyl ethyl ketone and 60 parts of toluene were added, kneaded and dispersed using a kneader and a sand mill, and 5 parts of polyisocyanate (Coronate L, manufactured by Nippon Polyurethane Industry) was added to the obtained paint. A magnetic recording layer coating liquid was prepared.
[0045]
<Comparative Example 1>
A magnetic recording paper was prepared in the same manner as in Example 1 except that the paper support obtained in the production of the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1. Obtained.
[0046]
・ Preparation of paper support
A raw material of NBKP 80% and LBKP 20% was beaten to 500 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa Chemical Industry Co., Ltd.) was added at 5.3% by weight of dry paper, and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) was added as an internal filler at 4.0% by dry paper weight. The pulp slurry was subjected to papermaking by a fourdrinier paper machine and subjected to a super calendering and 2-nip linear pressure of 100 kg / cm, and the basis weight was 160.0 g / m2. ² , Density 0.83g / cm ³ Was obtained.
[0047]
<Comparative Example 2>
A magnetic recording paper was prepared in the same manner as in Example 1 except that the paper support obtained in the production of the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1. Obtained.
[0048]
・ Preparation of paper support
A raw material of 0% NBKP and 100% LBKP was beaten to 300 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa Chemical Industry Co., Ltd.) was added at 5.3% by weight of dry paper, and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) was added as an internal filler at 4.0% by dry paper weight. The pulp slurry was subjected to papermaking by a fourdrinier paper machine and subjected to a super calendering and 2-nip linear pressure of 100 kg / cm, and the basis weight was 160.0 g / m2. ² , Density 0.83g / cm ³ Was obtained.
[0049]
<Comparative Example 3>
A magnetic recording paper was prepared in the same manner as in Example 1 except that the paper support obtained in the production of the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1. Obtained.
[0050]
・ Preparation of paper support
A raw material of 20% NBKP and 80% LBKP was beaten to 300 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa Chemical Industry Co., Ltd.) was added at 5.3% by weight of dry paper, and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) was added as an internal filler at 4.0% by dry paper weight. The pulp slurry is subjected to papermaking by a fourdrinier paper machine and subjected to a super calendering process with a 3-nip linear pressure of 200 kg / cm, and the basis weight is 160.0 g / m. ² , Density 1.05g / cm ³ Was obtained.
<Comparative Example 4>
A magnetic recording paper was prepared in the same manner as in Example 1 except that the paper support obtained in the production of the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1. Obtained.
[0051]
・ Preparation of paper support
A raw material of 20% NBKP and 80% LBKP was beaten to 300 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa Chemical Industry Co., Ltd.) and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) as an internal filler were added so as to be 4.0% by dry paper weight. The pulp slurry was subjected to papermaking by a fourdrinier paper machine and subjected to a super calendering and 2-nip linear pressure of 100 kg / cm, and the basis weight was 160.0 g / m2. ² , Density 0.83g / cm ³ Was obtained.
[0052]
<Comparative Example 5>
A magnetic recording paper was prepared in the same manner as in Example 1 except that the paper support obtained in the production of the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1. Obtained.
[0053]
・ Preparation of paper support
A raw material of NBKP 20% and LBKP 80% was beaten to 500 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa Chemical Industry Co., Ltd.) was added at 5.3% by weight of dry paper, and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) was added at 4.0% by weight of dry paper as an internal filler. The pulp slurry was subjected to paper making and a super calendering process with a 2-nip linear pressure of 100 kg / cm by a fourdrinier paper machine, and the basis weight was 60.0 g / m. ² , Density 0.83g / cm ³ Was obtained.
[0054]
<Comparative Example 6>
A magnetic recording paper was prepared in the same manner as in Example 1 except that the paper support obtained in the production of the following paper support was used instead of the paper support used in the production of the magnetic recording paper of Example 1. Obtained.
[0055]
・ Preparation of paper support
A raw material of NBKP 20% and LBKP 80% was beaten to 500 ml of freeness (JTAPPI T227). Next, rosin size (size pine NT-76, manufactured by Arakawa Chemical Industries, Ltd.) was used as an internal sizing agent at 0.7% per dry paper weight, and polyacrylamide (Polystron 851, Arakawa Chemical Industry Co., Ltd.) was added in an amount of 5.3% per dry paper weight, and talc (THF90, manufactured by Fukuoka Talc Co., Ltd.) was added as an internal filler so as to be 8.0% per dry paper weight. The pulp slurry was subjected to papermaking by a fourdrinier paper machine and subjected to a super calendering and 2-nip linear pressure of 100 kg / cm, and the basis weight was 160.0 g / m2. ² , Density 0.83g / cm ³ Was obtained.
The magnetic recording paper thus obtained was evaluated by the following methods, and the results are shown in Table 1.
[0056]
[Table 1]

[0057]
(Evaluation of Bokotsuki)
The following measurement was performed on the sample within 20 minutes after coating. The sample is adjusted to a size of 200 mm × 80 mm with the flow direction of the coated paper as a long side, and the sample is allowed to stand on a horizontal table. The appearance of the four sides of the sample that had been allowed to stand was evaluated on a four-point scale, and the height of the portion most protruding from the table due to the bump was measured with a ruler. The smaller the numerical value is, the better the paper is not raised due to bumps.
(Evaluation criteria)
◎: There is almost no unevenness.
: Slight bumps are observed.
Δ: Unevenness is observed.
×: Vignetting is intense.
[0058]
(Evaluation of punching failure)
The above sample was prepared with a width of 108 mm and a flow of 2,000 m, and punched residue was removed from the score portions (grooves 11, 12) with a rotary die cutter at a speed of 120 m / min as shown in FIG. 3, and the number of defective punches was measured. The smaller the value, the better the punching suitability of the rotary die cutter.
[0059]
(Evaluation of runnability)
The above sample was created with a width of 108 mm and a flow of 2,000 m, and punching of the score portions (grooves 11 and 12) was performed by a rotary die cutter at a speed of 120 m / min as shown in FIG. evaluated.
(Evaluation criteria)
◎: There is no paper flapping, and the running property is very good.
: Slight flapping of the paper was observed, and the running property was good.
Δ: Paper flapping was observed, and the running property was not very good.
×: Paper flapping was observed intensely, and the running property was very poor.
[0060]
(Evaluation of folding workability)
The above sample was made into a width of 108 mm and a flow of 2,000 m, and punching of the score portion (grooves 11 and 12) was performed by a rotary die cutter at a speed of 120 m / min as shown in FIG. Was evaluated in two stages.
(Evaluation criteria)
：: No problem in folding.
×: There is a problem in folding.
[0061]
(Difference in thickness between magnetic and non-magnetic parts)
The thickness of the magnetic part and the non-magnetic part of the sample was measured according to JISP8118.
[0062]
(Magnetic recording characteristics)
Magnetic recording characteristics (coercive force, residual magnetic flux density, squareness ratio) were measured with a vibrating sample magnetometer (VSM).
[0063]
(Output waveform)
The output waveform was measured with a Hioki Memory HiCorder.
: There is no distortion in the output waveform and there is no problem in reading.
×: The output waveform is distorted and reading is hindered.
[0064]
【The invention's effect】
The present invention is to provide a magnetic recording paper which is excellent in magnetic recording properties, has less unevenness, and has improved suitability for removing punched residue at a score portion by a rotary die cutter, running properties, and folding workability.
[Brief description of the drawings]
FIG. 1 is a partial plan view of an example in which a magnetic recording layer is stripe-coated on a base paper.
FIG. 2 is a configuration diagram of a rotary die cutter device for die-cutting a magnetic parking ticket.
FIG. 3A is a diagram illustrating a sheet in which a groove is punched out by a rotary die cutter device, and FIG. 3B is a diagram illustrating a sheet in which a groove is further punched out by the device.
[Explanation of symbols]
1,2 rotary die cutter

Claims (2)

A magnetic recording paper, in which a magnetic recording layer mainly composed of a magnetic compound and a binder is provided on at least one surface of a paper support using hardwood pulp in an amount of 50% by weight or more, is formed by a rotary die cutter. A magnetic recording paper obtained by punching, wherein the magnetic recording paper satisfies the following conditions (1) to (4).
(1) The interlayer strength (based on JISP8139: 1998) of the paper support is in the range of 50 to 120 N / m.
(2) the density of the paper support (JISP8118: Based on 1998) is in the range of 0.75~0.95g / cm ^3.
(3) the basis weight of the paper support (JISP8124: Based on 1998) is in the range of 70~250g / ^{m 2.}
(4) The ash content of the paper support (based on JISP8128: 1998) is in the range of 0.3 to 7%. ^2. The magnetic recording paper according to claim 1, wherein the magnetic coating amount of the stripe portion is in the range of ^{20 to} 50 g / m < ² > as a magnetic material.

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