JP2002363472A - Printing ink and printed matter using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent discoloration and a blocking phenomenon on the thermal face of a paper. SOLUTION: The below mentioned printing ink is used for printing a printing layer 3. The printing layer 3 comprises specific items, ruled lines, and the like, formed on the obverse face of a thermal layer 2 on a paper 1 of a printer paper 10 for an H/T use, and timing marks 5 formed along the edges of the reverse face of the paper 1 at a constant interval. The printing ink mainly contains coloring agents consisting of inorganic pigments, organic pigments, and the like, and an acrylic prepolymer. The ink further contains a polymerization initiator, but no monomer which works as a photoreactive diluting agent or a viscosity controlling agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed material printed by using an ultraviolet curable ink, and more particularly, to discoloration and blocking of a thermal surface in a printer paper for a handy terminal such as a meter reading sheet for gas, water, and power. The present invention relates to a printed matter using a printing ink capable of preventing the occurrence of a printed matter.

[0002]

2. Description of the Related Art Conventionally, a handy terminal (hereinafter referred to as H /
T) printers are mainly used for meter reading services such as gas, water, and power meter reading, and the printing method is such that a thermal paper wound in a roll shape is combined with a thermal head of an H / T printer. A thermal printing system in which the paper is conveyed between platen rollers and a thermal surface provided on the surface of the paper is heated by a thermal head as a heating means for printing is mainly used.

[0005] On the back side of the thermal paper used in the H / T printer, a timing mark is usually printed in a predetermined color at regular intervals along the edge thereof.

[0004] The printing ink used for printing the timing marks and the like is generally a heat-resistant UV-curable ink, and commercially available UV-curable inks include:
A coloring agent composed of an inorganic pigment, an organic pigment, and the like, a vehicle containing an acrylic prepolymer as a main component, and a polymerization initiator are contained, and the polymerization reaction of the vehicle is caused by irradiation with ultraviolet rays to be cured and dried. .

[0005] Further, in the vehicle of the above-mentioned ultraviolet curable ink, a viscosity adjusting agent or a solvent for lowering the viscosity of the ink is used.
2-hydroxyethyl methacrylate (HEMA) as a monofunctional monomer, 1,6-hexanediol diacrylate (HDDA) as a bifunctional monomer, and trimethylolpropane triacrylate (T
MPTA).

However, the monomer component that functions as the viscosity modifier or the photoreactive diluent has characteristics such as polarity and permeability that function as a solvent. When a timing mark or the like is printed on the back surface of the thermal paper using a curable ink, the thermal surface of the paper surface that contacts the ultraviolet curable ink printed on the back surface of the paper due to the polarity of the monomer component discolors, Due to the above-mentioned permeability of the monomer component, the monomer component of the ultraviolet curable ink printed on the back surface of the paper penetrates into the resin binder of the thermal layer on the paper surface and melts the thermal layer. In such a case, there is a problem that a blocking phenomenon occurs in which the sheets adhere to each other.

[0007] As described above, in the conventional ultraviolet curable ink, the amount of the ink is reduced by 10 due to the photopolymerization reaction caused by ultraviolet irradiation.
The polymer was not polymerized at 0%, but problems such as discoloration and blocking occurred due to monomer components remaining after the polymerization.

[0008] As for the ease of photopolymerization, there is a tendency that, for example, a color that easily absorbs light such as black color (black) has a poor drying property (polymerizability).

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to prevent discoloration and blocking of the thermal surface of paper. It is to provide a printing ink and a printed material using the same.

[0010]

In order to achieve the above object, a printing ink according to the present invention comprises an inorganic pigment, an organic pigment,
An ultraviolet curable ink containing a colorant composed of, for example, an acrylic prepolymer as a main component, containing a polymerization initiator, causing a polymerization reaction by ultraviolet irradiation, and curing and drying the ink. It does not contain a monomer component that functions as a reactive diluent or a viscosity modifier.

As the coloring agent, pigments for general inks can be used, for example, inorganic pigments such as titanium oxide (white) and carbon black (black), phthalocyanine green (green) and phthalocyanine blue. (Blue) phthalocyanine pigment, disazo yellow (yellow)
Organic pigments, such as an insoluble azo pigment of, and an azo lake pigment of Brilliant Carmine 6B (red).

The hue of the coloring agent is particularly effective when the color is a color having a high light absorption such as black, black or blue, that is, a color having poor polymerizability (drying property).

As the vehicle, for example, a polymer mainly composed of an acrylic prepolymer such as polyester acrylate, epoxy acrylate, urethane acrylate and polyol acrylate can be used.

The photopolymerization initiator includes, for example, 2-hydroxy-2-methylpropiophenone, 2,2
-Dimethoxy-2-phenylacetophenone and the like can be used.

The monomer components acting as a photoreactive diluent include 2-hydroxyethyl methacrylate (HEMA) as a monofunctional monomer and 1,2-hydroxyethyl methacrylate as a bifunctional monomer.
It refers to 6-hexanediol diacrylate (HDDA), trimethylolpropane triacrylate (TMPTA) as a trifunctional monomer, and the like.

The printing ink comprising the above components includes:
If necessary, photopolymerization accelerator, stabilizer (polymerization inhibitor),
Adhesion imparting agent, anti-misting agent, wax (lubricant)
Such an additive (adjuvant) may be added, and the amount of the additive (adjuvant) is about 5 to 10% by weight based on the total weight of the printing ink.

Further, as the above-mentioned ultraviolet curable ink,
It can also be used as a transparent varnish excluding the coloring agent.

Further, the printed matter according to the present invention is provided on a sheet of paper.
A colorant comprising an inorganic pigment, an organic pigment, and the like, and an acrylic prepolymer as main components, and a monomer component that functions as a photoreactive diluent or a viscosity modifier is contained in the ink containing the polymerization initiator. The present invention is characterized in that a printing layer is formed by using a non-printing ink, causing a polymerization reaction of the ink by ultraviolet irradiation, and curing and drying the ink.

Here, it is particularly effective when the hue of the colorant is a color having a high light absorption such as black, black or blue.

The printed matter according to the present invention is characterized in that the printed matter is a sheet having a heat-sensitive recording layer.

[0021]

As described above, according to the present invention, since the monomer component that functions as a viscosity modifier or a photoreactive diluent is not contained in the vehicle of the printing ink, the characteristics of the printing ink are attributed to the monomer component. Characteristics such as polarity and permeability that function as a solvent are lost, and printed matter provided with a printing layer formed by this printing ink may cause discoloration of the thermal surface between the contacting papers and adhesion of overlapping papers to each other This can prevent the occurrence of a blocking phenomenon, and can be used as a printed matter suitable for thermal paper in general, particularly for thermal roll paper used for an H / T printer.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, specific examples of printed matter using a printing ink according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an external plan view showing an example in which a printed material using the printing ink according to the present invention is applied to H / T printer paper, and FIG. 2 is a cross-sectional view showing the structure of the printer paper.

As shown in FIG. 1, H /
The T printer paper 10 is used as a gas charge notice, and has a thermal layer 2 which is a heat-sensitive recording layer formed on the surface of the paper 1, and a printing layer 3 made up of predetermined items and ruled lines formed on the surface of the thermal layer 2. Is formed on the back surface of the paper 1, a printing layer 4 including a charge table, notes, etc. is formed,
Timing marks 5 are printed on the back surface of the sheet 1 at predetermined intervals along the edge thereof in a predetermined printing color.

Then, the thermal paper on which the paper 1 is wound in a roll shape is transported between a thermal head of an H / T printer (not shown) and a platen roller, and a thermal layer 2 provided on the surface of the paper 1 is heated. By heating with a thermal head, various types of information including the date of meter reading, the number of meter readings, the amount of use, the usage fee, and the like are printed and notified to each household.

After the thermal printing by the thermal head, perforations 6 are formed at predetermined intervals along the longitudinal direction of the sheet 1 so as to be issued as a gas charge notice which is a single-piece sheet. .

FIG. 2 shows the structure of the printer paper 10.
More specifically, a thermal layer 2 is formed on the surface of the paper 1, and the thermal layer 2 is a solid at room temperature, and becomes a molten state by heating to react with each other to form an electron donor. The two components of the electron acceptor are dispersed in a resin binder as solid fine particles.

The feature of the present invention is that, in the thermal paper such as the H / T printer paper in the present embodiment, the discoloration of the thermal layer of the paper and the occurrence of a blocking phenomenon that the overlapping papers adhere to each other are generated. It can be prevented.

That is, as described above, on the surface of the thermal layer 2 on the paper 1, the print layer 3 including predetermined items and ruled lines is formed, and on the back of the paper 1, a fee table, precautions, and the like are formed. The print layer 4 and the timing marks 5 are printed at regular intervals along the edge thereof. The print layer 3 is formed on the surface of the thermal layer 2 and the print layer 4 is printed.
And the timing mark 5 are formed on the back surface of the paper 1. Since the back surface of the paper 1 may come into contact with the thermal layer 2 on the front surface of the paper 1 when wound in a roll shape, the print layers 3, 4 and the timing The condition is that the mark 5 is printed with the printing ink.

That is, the printing layers 3 and 4 and the timing marks 5 are formed of an ultraviolet curable ink in which a vehicle component of the printing ink does not contain a monomer component serving as a viscosity modifier or a photoreactive diluent.

In the present embodiment, the ultraviolet-curable ink contains an inorganic pigment composed of carbon black as a coloring agent in an amount of 25% by weight based on the total weight of the printing ink.
70% by weight of a polymer mainly composed of polyester acrylate is contained as a vehicle with respect to the total weight of the printing ink, and 2,2-dimethoxy-2-phenylacetophenone is used as a photopolymerization initiator in an amount of 5% based on the total weight of the printing ink.
The printing ink prepared by stirring and mixing the components containing the content by weight and kneading them with a kneader (not shown) was used.

The H / T printer paper thus constructed is conveyed between the thermal head of the H / T printer and the platen roller, and printing is performed by heating the thermal head. And good printing was possible.

Further, the printer paper for H / T is wound in a roll shape, and a predetermined pressure is applied to the printing paper 4 and the timing mark 5 formed on the back surface of the paper 1 and the thermal layer 2 on the front surface of the paper 1. When the contact surfaces were observed, the sheets did not adhere to each other, and the blocking phenomenon did not occur.

This is because the printing ink layers forming the timing marks 5 and the printing layers 3 and 4 in contact with the thermal layer 2 do not contain a monomer component serving as a viscosity modifier or a photoreactive diluent. The reason is that the discoloration of the thermal layer 2 caused by the polarity and the blocking phenomenon caused by melting the thermal layer 2 by dissolving the monomer component into the resin binder of the thermal layer 2 due to permeability could be eliminated. Conceivable.

Further, the printing ink according to the present invention is particularly effective when the hue of the colorant is a color having a high light absorptivity, such as black, black or blue, as in the above embodiment.

That is, when the hue of the colorant is a color having a high light absorptivity, the ultraviolet rays irradiated to the printing ink for the polymerization are also absorbed by the colorant, and the polymerization reaction (drying) occurs. Due to insufficient ultraviolet light used, drying properties were poor, and there was a problem that more monomer components causing discoloration and blocking remained.However, according to the printing ink according to the present invention, a coloring agent was used. Hue is black, black,
Even for colors with high light absorption, such as blue, the discoloration due to residual monomers is not contained in the vehicle of the printing ink because it does not contain a monomer component that acts as a viscosity modifier or a photoreactive diluent. And the occurrence of blocking and the like can be prevented.

Although not shown, the above-mentioned ultraviolet curable ink may be used as a transparent varnish except for a coloring agent. For example, in the final unit of a multicolor offset printing machine, the printing ink immediately after printing may be used. By overcoating a transparent varnish on the surface, it is possible to impart a gloss effect and abrasion resistance to the printed matter.

In the above embodiment, an example was described in which a printed material using the printing ink according to the present invention was applied to H / T printer paper. The blocking phenomenon can be applied to all printed matter in which the problem occurs, for example, it may be applied to carbonless paper or the like, and the form of the printed matter is not limited to the roll paper as in the above embodiment, but may be a folding type. May be applied to printed matter.

[0039]

As described above in detail, according to the printing ink of the present invention and the printed matter using the same, a monomer component that functions as a viscosity modifier or a photoreactive diluent is contained in the vehicle of the printing ink. As a result, the properties of the printing ink, such as the polarity of a solvent and the properties of permeability, are lost, and the printed material provided with the printing layer formed by the printing ink is not contacted due to the monomer component. This has the effect of preventing discoloration of the thermal surface between the sheets and the occurrence of a blocking phenomenon in which overlapping sheets adhere to each other.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example in which a printed material using a printing ink according to the present invention is applied to H / T printer paper; FIG. 1 (a) shows the surface of the printer paper; It is an external appearance top view which shows a back surface.

FIG. 2 is a cross-sectional view showing the configuration of the H / T printer paper shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper 2 Thermal layer 3 Printing layer (front surface) 4 Printing layer (back surface) 5 Timing mark 6 Perforation 10 Printer paper for H / T

Claims (3)

[Claims] 1. An ultraviolet curable ink comprising a colorant composed of an inorganic pigment, an organic pigment, and the like, and an acrylic prepolymer as main components, containing a polymerization initiator, causing a polymerization reaction by ultraviolet irradiation, and curing and drying. A printing ink, characterized in that the ink does not contain a monomer component that functions as a photoreactive diluent or a viscosity modifier. 2. A paper comprising, as main components, a colorant composed of an inorganic pigment, an organic pigment, and the like, and an acrylic prepolymer on paper.
Printing that uses a printing ink that does not contain a monomer component that acts as a photoreactive diluent or viscosity modifier in the ink that contains the polymerization initiator, and causes the polymerization reaction of the ink to be cured and dried by ultraviolet irradiation. Printed matter characterized in that a layer is formed. 3. The printed matter according to claim 2, wherein the paper is a paper having a heat-sensitive recording layer.