JP2899897B2 - Passbook cloth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cover material for a bankbook, which has good printing suitability, that is, a printing ink, for automatic printing by a computer terminal represented by a wire dot matrix printer. Adsorption and transfer stains immediately thereafter. The present invention also relates to a passbook cloth having a good gloss of the ink for offset printing.

[Conventional technology]

The cover material of bankbooks used in the Ministry of Posts and Telecommunications, banks, shinkin banks, etc. requires extremely diverse performances, and is typically used for offset printing, stamping and writing, antifouling performance, water and moisture resistance. Performance such as performance, endurance, and foil stamping suitability has been necessary, but magnetic media such as magnetic tape, magnetic foil, and magnetic printing are provided on the passbook cover by computerization. It has been called an important part of high-performance computer precision parts.

In order to provide these properties, synthetic resin, synthetic rubber,
A printing ink absorbent / print adsorbent represented by an inorganic filler such as calcium carbonate, magnesium carbonate, barium sulfate, clay, silica, etc. is blended with a binder (main agent) represented by a paste, etc., as required. A colorant, an antifouling agent, a coating material added with a lubricant, etc. is applied to the surface of a web serving as a base material of a cotton fabric or paper, and after forming a film, surface smoothness is imparted by a calendering treatment or the like so that a passbook cloth or , Has been offered as a magnetic passbook cross.

However, as another service and accuracy improvement measures by computerization, the name of the savings depositor, store name, store number, account number, etc. are written on the surface of the passbook cover material with a handwriting such as a ballpoint pen, fountain pen, felt-tip pen, or stamp printed. Has been adopted by a computer terminal printer for automatic printing.

In particular, in the printer, the passbook cover is transported inside the printer by a roller built in the printer, and the automatically printed cover comes into contact with the roller immediately after printing, and when the ink absorbing performance of the cover material is insufficient, the cover on the roller cover is used. The ink on the roller is transferred and adhered to the roller, and the ink on the roller is transferred again as a print mark (shadow) to another part other than the printed part of the passbook cover as the roller rotates, causing unsightly stains. I have. In addition, passbook cover materials with few print marks have good absorption of the ink for offset printing, and the gloss of the printing ink is lost, which causes poor print appearance.

[Problems to be solved by the invention]

The present invention has been made in view of the above circumstances, and provides a cover material for a bankbook with good gloss of ink after offset printing, which maintains the sharpness of printing even during automatic printing and does not cause a problem of print shadow transfer stain. It is intended for.

[Means for solving the problem]

The present invention provides a passbook cloth characterized in that a surface coating layer made of a thermoplastic resin containing heavy calcium carbonate is formed on an upper surface of a cover material.

As described above, conventionally, ordinary passbook cloths include binders (main components) represented by synthetic resins and synthetic rubber pastes and inorganic fillers such as calcium carbonate, magnesium carbonate, barium sulfate, clay, and silica. The printing ink absorber and printing adsorbent to be blended and, if necessary, a paint to which a coloring agent, an antifouling agent, a lubricant, etc. is added, is applied to the surface of a web as a base material of cotton fabric and paper, and a film is formed. After being formed, it has been provided as a passbook cloth or magnetic passbook required cloth by imparting surface smoothness by calender treatment or the like.

However, the most important performance as a passbook cloth is left to the surface performance of the surface coating film. The quality performance is determined by the type and amount of the inorganic filler as the agent.

In particular, the printing ink is not a hardening type like a printing ink, and the speed of penetration of the ink from the outermost surface layer to the inside determines adhesion to the feed roller of the printer only by absorption and adsorption.

However, the following facts were proved by the inventors' research, and the requirements were successfully satisfied.

The drawing is a cross-sectional view showing an example of the configuration of the passbook cloth of the present invention, in which coating layers 2A and 2B are formed on the front and back surfaces of a base material 1, and 3 is a coating layer 2B on the back surface of the base material. The thin paper is attached, and the paper on the entry side of the passbook is attached to the three thin papers. This is the cover material 6. The passbook cloth of the present invention is a cover material 6
A passbook cloth 5 provided with a surface film 4 made of a mixture of a thermoplastic resin and heavy calcium carbonate on 2A of the surface
It is.

A feature of the present invention is a surface film formed from a thermoplastic resin containing amorphous heavy calcium carbonate, and has an amorphous structure having an average particle size of 0.5 to 5.0 μ with respect to 100 parts by weight of the thermoplastic resin. using a mixed paint containing heavy calcium 100-400 parts by weight carbonate, by weight solids deposition is applied such that 5 to 25 g / m ^2, solving the problems by forming the surface film It was done.

[Action]

The thermoplastic resin is a thermoplastic saturated copolyester resin having a molecular weight of 8,000 to 30,000; a glass transition temperature of −10 ° C. to 75 ° C., and having a hydroxyl group and a carboxyl group at a molecular chain terminal. When the glass transition temperature is lower than -10 ° C, the coating film becomes sticky and the cover material becomes sticky.

On the other hand, when the glass transition point temperature is 75 ° C. or higher, adhesion to heavy calcium carbonate is deteriorated, and picking is deteriorated.

Heavy calcium carbonate has an amorphous structure, and its average particle size is
It is in the range of 0.5 to 5μ. When the average particle size of the heavy calcium carbonate is less than 0.5 μm, the gloss of the printing ink is good, but the dispersibility of the paint is reduced and the suitability for the dot printer is reduced.
On the other hand, when it is 5 μm or more, the gloss of the printing ink is reduced.

Also, light calcium carbonate such as a spun type has calcium carbonate particles coming out on the film due to its shape, and its luster is reduced.

The heavy calcium carbonate may be mixed with other inorganic fillers as long as the luster, which is the object of the present invention, is not reduced.

For example, silica (average particle size 0.5
~ 15μ) is mixed with 50% by weight or less of heavy calcium carbonate.

The mixing ratio of the above thermoplastic resin and heavy calcium carbonate is 100 to 400 parts by weight of heavy calcium carbonate with respect to 100 parts by weight of thermoplastic resin, and 100 parts by weight of heavy calcium carbonate is used.
If the amount is less than the weight part, the resin film wraps the heavy calcium carbonate, and the printability by the dot printer is reduced,
On the other hand, if the amount is more than 400 parts by weight, the amount of the resin is reduced, the adhesion between the heavy calcium carbonate is poor, and the picking strength is reduced, which is not practical.

In order to form a surface coating film comprising a mixture of the above-mentioned thermoplastic resin and heavy calcium carbonate on the surface of the cover material, the mixture is dispersed or dispersed in water with an organic solvent or the organic solvent is dissolved or decomposed. After coating on the surface of the cover material, it is dried.

As a method of applying the above paint, knife coating,
A commonly used method such as roll coating, spray coating, gravure coating, reverse roll coating and the like can be applied.

Note that a colorant such as a pigment may be added to the paint.

The coating amount of the above-mentioned paint is 5 to 25 g / m ² of solid content. If the solid content is less than 5 g / m ² , the suitability for a dot printer is reduced, and if it exceeds 25 g / m ² , the suitability for offset printing is reduced, which is not practical.

As the base material constituting the cover material in the present invention, a woven fabric, paper, or the like is used. Particularly, by using a T / C blended fabric, a cover material having excellent tear strength and stretchability can be provided.

That is, the cover material referred to in the present invention is a synthetic resin such as polyvinyl alcohol, polyacrylate, polyvinyl acetate, on one or both sides of a base material, preferably a blended fabric (T / C) of polyester and cotton, A coating layer consisting of a mixture of natural resins such as starch and casein, inorganic fillers such as calcium carbonate, titanium oxide and clay, and pigments, activators, oil agents, and water-resistant agents. The coating weight is usually 50 to 150 g / m ² .

〔Example〕

Example 1. Blended plain fabric of polyester and cotton (65% polyester
65% yarn of 35% cotton; driving length 90 × width 88 / inch)
Starch, polyacrylate, polyvinyl-
A cover material having a mixture of alcohol, calcium carbonate, and titanium oxide at a solid content of 80 g / m ² , calendering was performed, and thin paper having a basis weight of 18 g / m ² was adhered to the back surface was used.

A surface paint (solid content: 45% by weight) in which a mixture of 100 parts by weight of a polyester resin and 300 parts by weight of heavy calcium carbonate (average particle diameter: 1.3 μm) is dispersed in a mixed solvent of toluene and methyl ethyl ketone on the surface of the cover material. %) With a gravure roll and dried to obtain a passbook cloth having a solid content of 12 g / m ² of the surface film.

Example 2 A mixture of 100 parts by weight of a polyester resin and 330 parts by weight of heavy calcium carbonate (average particle size: 2.0 μm) was dispersed on the surface of the cover material of Example 1 with a mixed solvent of methyl isobutyl ketone and cyclohexanone. A surface paint (solid content: 40% by weight) was applied in the same manner as in Example 1 to obtain a passbook cloth having a solid content of 15 g / m ² on the surface film.

The following table shows the performance of Examples 1 and 2 and Comparative Examples that do not satisfy the requirements of the present invention.

The evaluation in the above table is as follows.

Evaluation was not made for those having a suitability for offset printing. In addition, the tear strength and the elongation ratio of Example 2 and Comparative Examples 1 to 7 were not evaluated.

(1) Suitability of dot printer Immediately after printing on the sample surface with a printer, roll a urethane rubber roller on the printing surface, and visually check the density of the print shadow from the rubber roller to other parts of the passbook cloth surface.
The mark with a light print shadow was indicated by ○, and the mark with a dark print shadow was indicated by X.

(2) For samples suitable for offset printing (surface picking)
Printing was performed with an RI tester, and those without surface picking (peeling) were indicated by ○ and those with surface picking were indicated by x.

(3) Gloss of the ink After printing on the sample with an RI tester and leaving it at room temperature and humidity for 24 hours, visually check the gloss of the ink. Indicated by x.

(4) Adhesive strength of magnetic tape According to the adhesive strength test method for electric insulation of JIB-C-2167, using a magnetic tape manufactured by Hitachi Maxell Co., Ltd.
Tested at 0 mm / min. Those with a width of 700 g / cm or less are not practical.

(5) Tear strength conforms to the test method of JIS-P-8116.

(6) Expansion and contraction The length of expansion and contraction after immersing the sample in water at 25 ± 2 ° C. for 10 minutes is compared with the original length.

As can be seen from the above table, Examples 1 and 2 satisfy each performance as a passbook cloth, but Comparative Example 1 in which no surface coating is provided, Comparative Example 2 in which the average particle size of heavy calcium carbonate is too small,
Comparative Example 4 in which the solid content of the surface film was too small was not suitable for a dot printer.

Further, Comparative Example 5 in which the solid content of the surface coating was excessive and Comparative Example 7 in which heavy calcium carbonate was excessive were all inadequate for offset printing.

Comparative Example 6, in which silica was mixed instead of heavy calcium carbonate, had poor ink luster. Comparative Example 8 using a 60th count cotton flat woven fabric (prepared 90 × width 88 / inch) as the base material
Is inferior to Example 1 in tear strength and stretch ratio.

〔effect〕

The passbook cloth of the present invention is excellent in offset printing suitability, stamp printing suitability, writing suitability, dot printer suitability, and also excellent in antifouling performance, water and moisture resistance, foil stamping performance and the like. In particular, it is excellent in the ink absorbency of dot printers in office work by computers of recent passbook computers or the ink absorbability in offset printing, and the printing surface is good, and it is extremely excellent as a cover material for bankbooks. Things.

[Brief description of the drawings]

The drawings are sectional views showing an example of the present invention. DESCRIPTION OF SYMBOLS 1 ... Base material, 2-A ... Coating layer, 2-B ... Coating layer, 3 ... Thin paper, 4 ... Surface coating, 5 ... Passbook cloth, 6 ... Cover material.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI // D02G 3/04 D21H 1/22 B

Claims (3)

(57) [Claims] 1. A coating layer in which an inorganic filler such as calcium carbonate or magnesium carbonate or the like is mixed with a synthetic resin or a natural resin on one or both surfaces of a substrate, and on one surface of the coating layer, 100 to 4 parts by weight of thermoplastic resin having an average particle size of 0.5 to 5.0 μm
Solid adhering amount of coating mix comprising 00 parts by weight 5g / m ² ~25g / m ²
A passbook cloth characterized by a surface coating of. 2. The thermoplastic resin of the surface film has a molecular weight of 8,000.
The passbook cloth according to claim 1, which is a saturated copolymerized polyester resin having a hydroxyl group and a carboxyl group at a molecular chain terminal having a glass transition temperature of -10 ° C to 75 ° C. . 3. The passbook cloth according to claim 1, wherein the base material of the passbook cloth is a blended fabric of polyester and cotton.