JPH06312595A - Magnetic ticket sheet - Google Patents

Abstract

PURPOSE:To provide a magnetic ticket sheet in which an irregularity in a read output of written magnetic recording information is small. CONSTITUTION:A wter absorbing capacity of a support formed of wood pulp as a main material is set to 10g/m<2> of a Cobb size determined by JIS P 8140. The Cobb size of 10g/m<2> or less is easily obtained by paper making with water repellant, and a magnetic recording layer is provided on one surface of this support to obtain a magnetic ticket sheet. Thus, an irregularity in a magnetic output is small, and an erroneous operation of an apparatus as seen from a final user is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various types of magnetic ticket sheets such as boarding tickets, coupon tickets, commuter tickets, highway pass tickets, parking tickets, admission tickets and the like.

[0002]

2. Description of the Related Art Conventionally, there are various types of magnetic ticket sheets, and a magnetic recording layer is provided on one surface of a support. This magnetic recording layer is required to have better magnetic characteristics as the density of magnetic recording increases. The most important quality characteristic required for the magnetic recording layer is the variation in the magnetic output of the magnetic recording information when reading the written information. If the variation is too large, it will appear as erroneous information at the time of reading, and this will have a harmful effect on the normal operation of the devices. In particular, it is said that the variation in the magnetic output of a magnetic ticket sheet using paper made mainly of wood pulp as a support is inferior to that when a plastic film is used as the support.

[0003]

DISCLOSURE OF THE INVENTION According to the present invention, when paper having wood pulp as a main raw material is used as a support and a magnetic layer is provided on the paper, the variation in magnetic output is very small, and excellent magnetic characteristics are obtained. It is intended to provide a magnetic ticket sheet having

[0004]

As a result of intensive studies to solve this problem, the present inventor has determined that the Cobb size degree of the paper specified in JIS-P8140 is 10 g / m ² or less, and the ferromagnetic powder is further added. It has been found that by providing a magnetic recording layer containing an aqueous binder as a main component, a good magnetic ticket sheet with a small variation in magnetic output can be obtained. A smaller Cobb size is preferable, but a preferable value can be arbitrarily selected in consideration of the manufacturing process, cost, and the like. The Cobb size degree of paper defined in JIS-P8140 is a test method of water absorption when one side of paper or paperboard is in contact with water for a certain period of time, and a test piece after mass measurement (about 130 m
(m × 130 mm) is fixed between the base and the metal ring (area 100 cm ² ), about 50 ml of water at 20 ° C. is poured and allowed to contact for a predetermined time, then the surface water is removed with absorbent paper, and the mass is measured. To do. The water absorption amount per 1 m ² (g / m ² ) is determined and expressed as water absorption. In the present specification, the predetermined time of contact with water is 30 seconds unless otherwise specified.

The support used in the present invention is mainly made of wood pulp, and in addition, plant fiber, synthetic pulp made of synthetic resin, cellulosic chemical fiber, synthetic fiber, glass fiber and other inorganic fibers are required. It can be used together depending on the situation. As raw materials for wood pulp, red pine, black pine,
Abies sachalinensis, spruce pine, fir, hemlock, cedar, cypress, larch, syllab, spruce, hiba, mercus pine, radia
Conifers such as tapain, black pine, pine, cedar, spruce, whitefar, birch, beech, alder tree,
Broad-leaved trees such as oak, tub, shii, birch, cottonwood, poplar, taro, dorayana, eucalyptus, mangrove, and rawan are mentioned. In addition, fillers such as talc and calcium carbonate, sizing agents such as synthetic resin, rosin and starch, and if necessary, wet strength improver, softener, curing agent, retention improver, defoaming agent, gums, water repellent Etc. can be used, and a magnetic recording layer containing a ferromagnetic powder and an aqueous binder as main components is provided on this support. The basis weight of the support is 60
Preferably those to 300 g / m ^2, more preferred range is 100 to 200 g / m ^2.

A support having a Cobb size degree of 10 g / m ² or less can be easily prepared by using a water repellent. A method of papermaking a sizing agent and a water repellent together with wood pulp has been performed in the art for a long time, and gloss is imparted or printability is improved depending on its purpose. There is no document which describes that the magnetic characteristics are improved by providing a magnetic recording layer on a support containing a water repellent and having a reduced water absorption.

The amount of the water repellent used for obtaining a good magnetic ticket sheet should be about 5% to 20% of the weight of wood pulp by weight, but it should be considerably higher than the amount usually used in the art. Is new. If the degree of Cobb size is 10 g / m ² or less, a sufficient effect can be obtained, and use of an unnecessarily large amount of water repellent will only be economically disadvantageous. In order to make the Cobb size degree 10 g / m ² or less, the type and amount of the water repellent agent are freely adjusted and determined according to the end user's demand for quality characteristics.

For the production of paper as a support, a paper machine such as a Fourdrinier, a round net, and a twin wire can be used, and if necessary, a method such as a size press or a coating can be added. The characteristics of the present invention can be imparted. The variation in magnetic output is also affected by the surface properties of the sheet. It is quite natural that the flatness provides better adhesion to the magnetic head, and thus the variation in magnetic output becomes smaller. Therefore, a flattening device such as a machine calender, a gloss calender, a super calender, or a brushing can be used after the paper making process or the magnetic layer coating process.

The water repellent of the present invention can be selected from a wide range as long as it has an effect of lowering the water absorption of the support mainly composed of wood pulp. For example, animal and vegetable waxes such as carnauba wax, rice wax, beeswax, and seraca wax, petroleum waxes such as paraffin wax and petrolatum, synthetic waxes such as polyethylene wax or higher fatty acids and their metal salts, amides and esters, styrene- Acrylic resins, acrylic resins, urea formalin resins, urethane resins, etc., alkyl ketene dimers, silicone oils, metal soaps, etc. can be used alone or in combination.

The magnetic recording layer contains a ferromagnetic powder and an aqueous binder as main components, and if necessary, a defoaming agent, a thickener, a curing agent, a penetrant, an antiblocking agent, a water repellent and a water resistant agent. Etc. can be used. As the magnetic powder, γ ferrite, barium ferrite, strontium ferrite, etc. are used, but barium ferrite and strontium ferrite having a coercive force of 1500 to 5000 oersted are often used because magnetic recording information cannot be erased by a normal magnet. . A polyacrylic acid salt or the like can be used to disperse the magnetic powder.

Examples of the aqueous binder include oxidized starch and ether
Starches such as tellurized starch, hydroxyethyl cellulose, methyl cellulose, polyvinyl alcohol,
Water-soluble binders such as polyacrylamide, carboxymethyl cellulose, gum arabic, casein, gelatin, and polyethylene oxide, and various latexes such as polyurethane, vinyl chloride, polyacrylic, and styrene butadiene can be used.

As an apparatus used for coating the magnetic recording layer of the present invention, an air knife coater, a gravure coater, a roll coater, a rod coater, a curtain coater, a die coater, a lip coater, a blade coater or the like is used. Also, printing methods such as offset and silk screen can be used.

[0013]

In the present invention, a magnetic ticket sheet having a small variation in magnetic output can be obtained by applying a magnetic recording layer coating liquid to a support having a low water absorption. The reason for this seems to be related to the behavior of the coating liquid from the contact of the coating liquid with the support to the drying of the coating liquid when the magnetic recording layer coating liquid is applied. That is, since the change in liquid composition due to migration appears as a variation in magnetic output, it is considered that this characteristic is improved by lowering the water absorption of the support.

[0014]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
In addition, "part" in an Example shows a weight part.

Example 1 Papermaking Example The compounding ratio of the support is as follows. Wood pulp (LBKP) (solid) 100 parts Rosin (solid) 1 part Sulfuric acid band (solid) 2 parts Polyacrylamide (solid) 0.5 part Water repellent (solid) 5.5 parts (fluorine-based polymer emulsion, Asahi Glass) Manufactured by Asahi Guard AG550) beaten with a beater to a freeness of 40 degrees and a shopper ligler,
Sodium salt of rosin was added, and further a sulfuric acid band, cation-modified polyacrylamide and finally a water repellent were added to make the solid content of the aqueous slurry about 0.3%. A support for a magnetic ticket sheet having a basis weight of 150 g / m ² was obtained from the above paper materials using a Fourdrinier paper machine. Preparation of Magnetic Recording Layer Coating Liquid The following formulation was dispersed in a ball mill for one day to prepare a magnetic recording layer coating liquid. Barium ferrite (manufactured by Toda Kogyo Co., Ltd. MC127, coercive force 2700 oersted) (solid) 100 parts Urethane-acrylic resin (Mitsui Toatsu Co., Ltd. Barrier Star-UD2017-1) (solid) 30 parts Polyethylene oxide (Sumitomo Seika PEO) -1 Weight average molecular weight 200,000) (Solid) 5 parts The magnetic recording layer coating liquid is applied to one side of a support having a basis weight of 150 g / m ² obtained by the above-mentioned formulation, and a solid content of 30 g / It is coated so that it becomes m ^2, and it is 1 after the magnetic field orientation.
It was dried at 10 ° C to obtain a magnetic ticket sheet of the present invention.

Example 2 A magnetic ticket sheet was obtained in the same manner as in Example 1 except that 10 parts of the solid water repellent was used to prepare the support.

Example 3 In the same manner as in Example 1, except that the same amount of paraffin wax emulsion (Platex NS-70D, manufactured by Misawa Ceramics Co., Ltd.) was used as a water repellent in the preparation of the support, the magnetic property was changed. I got a ticket sheet.

Example 4 Of Example 1, styrene was used as a water repellent agent for preparing the support.
A magnetic ticket sheet was obtained in the same manner as in Example 1 except that the acrylic resin (Epicnox GR100 manufactured by Dick Hercules Co., Ltd.) was replaced in the same amount.

Example 5 A magnetic ticket sheet was prepared in the same manner as in Example 1 except that zinc stearate (manufactured by Chukyo Yushi Co., Ltd., Himicron F930) was replaced as a water repellent in the preparation of the support. -I got it.

Example 6 In the same manner as in Example 1, except that the same amount of urea formalin resin system (Tamacoat 138, manufactured by Arakawa Chemical Co., Ltd.) was used as a water repellent agent in the preparation of the support, the magnetic property was changed. I got a ticket sheet.

Comparative Example 1 A magnetic ticket sheet was obtained in the same manner as in Example 1 except that a support containing no water repellent was prepared.

COMPARATIVE EXAMPLE 2 A magnetic ticket sheet was obtained in the same manner as in Example 1 except that a support containing 3 parts of the water repellent was prepared.

The magnetic ticket sheets obtained in the above Examples and Comparative Examples were evaluated by the following methods. The results are shown in Table 1. (Water absorption) According to the Cobb size method defined in JIS-P8140, the contact time between the sample and water was 30 seconds in the present specification. (Dispersion of Magnetic Output) A magnetic characteristic analyzer for a prepaid card (210 BPI writing FM system) was used to measure the variation from the average output. The unit is indicated by%, and the smaller the number, the better.

[0024]

[Table 1]

[0025]

The magnetic ticket sheet of the present invention has little variation in magnetic output and has good magnetic characteristics.

Claims (2)

[Claims] 1. A magnetic ticket sheet comprising a support and a magnetic recording layer containing a ferromagnetic powder and an aqueous binder as main components on one surface of the support, wherein wood pulp is mainly used as a support.
Cobb size degree of paper specified in IS-P8140 is 10g
A magnetic ticket sheet characterized by using a sheet of less than / m ² . 2. The magnetic ticket sheet according to claim 1, wherein the support contains 5% by weight or more of a water repellent.