KR20200062208A - No pigment, paint and printing - Google Patents

Abstract

The present invention provides a pigment capable of forming a surface layer capable of satisfactorily performing gradation printing on a printing substrate that performs gravure printing. The pigment of the present invention has an inorganic fine particle and a coating layer formed on the surface of the inorganic fine particle and containing a metal oxide, and after the start of measurement by the glow discharge luminescence analysis method (GD-OES analysis method), the depth after sputtering for 1 second. It is characterized in that the luminescence intensity of Zn in the range is 0.005 to 0.015, and the luminescence intensity of Zn in the depth after sputtering for 5 seconds after the start of the measurement is 0.003 to 0.013, and the average particle diameter is 50 to 300 nm.

Description

No pigment, paint and printing

The present invention relates to pigments, paints and printing elements.

Currently, medical medicines that require a doctor's prescription are prescribed in accordance with a pharmacist's prescription in a hospital or pharmaceutical pharmacy. When a pharmacist identifies a drug, it is often based on printing on the drug package. Therefore, in order to distinguish it from other medicines, the printing performed on the medical medicine packaging is devised such that various fonts, colors and patterns are used.

However, the types of medicines are on the rise, and there are cases where the design of the medicine package is similar. Since the similarity of the package design may lead to a prescription miss, there is a desire to use gradient printing for printing of the package in order to diversify the design of the pharmaceutical package.

On the other hand, it is obligatory for the PTP package to put a barcode on the surface of the lid material to prevent a prescription miss. For this reason, white printing is performed on the surface of the cover material of most PTP packages using white paint.

When gradation printing is performed on the white civil printing, there is no problem in the deep-colored portion, but in the light-colored portion (light portion), and particularly in the portion slightly stained with ink (high-light portion), the ink is hardly transferred and printing There is a problem that a state that has not been performed (missing printing) occurs.

Therefore, Patent Document 1 proposes a gravure printing ink for surface printing containing an inert particulate filler, a pigment, a binder resin, and a solvent having an average particle diameter of 0.5 to 2.5 µm.

Japanese Patent Publication No. 2009-114256

However, even if the gravure printing ink for surface printing is used, there is a problem that printing omission occurs in the light portion and the highlight portion.

Therefore, as a result of various studies, the inventors have found that the properties of the printing surface of the printing substrate on which gravure printing is performed affects the gradation printing similarly to the gravure printing ink.

The present invention provides a pigment capable of forming a surface layer capable of satisfactorily performing gradation printing on a printing substrate that performs gravure printing, a paint using the same, and a printing member using the paint.

The pigment of the present invention has an inorganic fine particle and a coating layer formed on the surface of the inorganic fine particle and containing a metal oxide, and at a depth after sputtering for 1 second after starting measurement by the glow discharge emission analysis method (GD-OES analysis method). It is characterized in that the luminescence intensity of Zn in the range is 0.005 to 0.015, and the luminescence intensity of Zn in the depth after sputtering for 5 seconds after the start of the measurement is 0.003 to 0.013, and the average particle diameter is 50 to 300 nm.

The paint containing the pigment of the present invention can form a surface layer suitable for gradation printing on the surface of a printing substrate on which gravure printing is performed.

The surface layer formed using the paint of the present invention can reliably transfer the ink contained in the cell of the gravure printing roll to the surface layer of the printing member by making the surface of the printing member contact the surface of the gravure printing roll. have.

Therefore, when gravure printing is performed using gravure printing on the surface layer of the printing member formed using the paint containing the pigment of the present invention, beautiful printing is also performed in both the deep-colored and light-colored portions, particularly the light portion and the highlight portion. It can be carried out and beautiful gradation printing can be obtained.

1 is a cross-sectional view showing a printed substrate on which a surface layer is laminated and integrated.
2 is a schematic diagram showing a method of performing gravure printing on a surface layer on a printing substrate.
3 is a cross-sectional view showing an example of a PTP package.

The pigment of the present invention has an inorganic fine particle and a coating layer formed on the surface of the inorganic fine particle and containing a metal oxide, and after the start of measurement by the glow discharge luminescence analysis method (GD-OES analysis method), the depth after sputtering for 1 second. It is characterized in that the luminescence intensity of Zn in the range is 0.005 to 0.015, and the luminescence intensity of Zn in the depth after sputtering for 5 seconds after the start of measurement is 0.003 to 0.013, and the average particle diameter is 50 to 300 nm.

As the inorganic fine particles, a surface layer formed of a paint containing a pigment should just be able to form a printing surface for gravure printing. As the inorganic fine particles, it is preferable that the surface layer formed of the paint is white.

Examples of the inorganic fine particles include silica fine particles, zinc oxide fine particles, titanium oxide fine particles, zirconium oxide fine particles, aluminum oxide fine particles, tin oxide fine particles, indium oxide fine particles, zirconium oxide fine particles, antimony oxide fine particles, magnesium oxide fine particles, or main components thereof. Complex oxide fine particles, calcium carbonate fine particles, talc, clay, calcined kaolin fine particles, calcined calcium silicate fine particles, aluminum silicate fine particles, magnesium silicate fine particles, calcium phosphate fine particles, etc., and titanium oxide fine particles are preferable. In addition, the inorganic fine particles may be used alone or in combination of two or more.

On the surface of the inorganic fine particles, a coating layer containing a metal oxide is integrally provided. The coating layer may be formed on a part of the surface of the inorganic fine particles, but is preferably formed on the entire surface of the inorganic fine particles.

The metal oxide constituting the coating layer is not particularly limited as long as zinc oxide is included. Examples of metal oxides other than zinc oxide include aluminum oxide (alumina), silica, zirconium oxide (zirconia), tin oxide, antimony oxide, and zirconium oxide and silica are preferred. Further, the metal oxides may be used alone or in combination of two or more.

In the present invention, various studies have been conducted on the metal oxide contained in the coating layer of the pigment, and the distribution of the content of the metal oxide in the thickness direction of the coating layer affects the transferability of the ink contained in the cell of the gravure printing roll. I figured it out.

In the coating layer of the pigment, if the luminous intensity of Zn at a predetermined depth from the surface of the pigment, that is, the content of Zn (content of zinc oxide) is within a predetermined range, the coating film of the paint containing the pigment is not clearly explained. It has excellent surface smoothness, and the transferability of the ink in the cells of the gravure printing roll is improved. As a result, even if the opening area of the cell of the gravure printing roll is small, the ink in the cell of the gravure printing roll can be satisfactorily transferred to the surface layer of the printing member, and a clear gradation with little printing omission in the light portion and the highlight portion You can get printing.

Specifically, when the pigment was analyzed by a glow discharge emission analysis method (GD-OES analysis method), the emission intensity of Zn at a depth after sputtering for 1 second after the start of the measurement was 0.005 to 0.015, and preferably 0.008 to 0.010. . When the luminescence intensity of Zn is 0.005 or more, the surface smoothness of the coating film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll Even in the case where the opening area of the cell is small, the ink in the cell of the gravure printing roll can be satisfactorily transferred to the surface layer of the printing member, and a clear gradation printing with almost no printing omission in the light portion and the highlight portion can be obtained. When the luminescence intensity of Zn is 0.015 or less, the whiteness of the coating film (surface layer of the printing member) containing the pigment becomes appropriate, and excellent gradation printing can be performed.

Further, when the pigment was analyzed by a glow discharge luminescence analysis method (GD-OES analysis method), the luminescence intensity of Zn at a depth after sputtering for 5 seconds after the start of the measurement was 0.003 to 0.013, and preferably 0.006 to 0.010. When the luminescence intensity of Zn is 0.003 or more, the surface smoothness of the coating film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll Even in the case where the opening area of the cell is small, the ink in the cell of the gravure printing roll can be satisfactorily transferred to the surface layer of the printing member, and a clear gradation printing with almost no printing omission in the light portion and the highlight portion can be obtained. When the luminescence intensity of Zn is 0.013 or less, the whiteness of the coating film (surface layer of the printing member) containing the pigment becomes appropriate, and excellent gradation printing can be performed.

When the pigment was analyzed by a glow discharge luminescence analysis method (GD-OES analysis method), the luminescence intensity of Zn at a depth after sputtering for 1 second after the start of the measurement has a better surface smoothness of the coating film of the paint containing the pigment, Zn in the depth after sputtering for 5 seconds after the start of the measurement, since the transferability of the ink in the cell of the gravure printing roll is further improved, the surface layer of the printing member can be better transferred, and a clearer gradation printing can be obtained. It is preferable that it is larger than the light emission intensity of.

In addition, when zirconium oxide is contained in the coating layer, when the pigment is analyzed by a glow discharge emission analysis method (GD-OES analysis method), the emission intensity of Zr at a depth after sputtering for 1 second after the start of measurement is 0.065 to 0.090 This is preferable, and 0.067 to 0.089 are more preferable. When the luminescence intensity of Zr is 0.065 or more, the surface smoothness of the coating film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll Even in the case where the opening area of the cell is small, the ink in the cell of the gravure printing roll can be satisfactorily transferred to the surface layer of the printing member, and a clear gradation printing with little printing omission in the light portion and the highlight portion can be obtained. When the luminescence intensity of Zr is 0.090 or less, the whiteness of the coating film (surface layer of the printing member) containing the pigment becomes appropriate, and excellent gradation printing can be performed.

When the coating layer contains zirconium oxide, when the pigment is analyzed by a glow discharge luminescence analysis method (GD-OES analysis method), the luminescence intensity of Zr at a depth after sputtering for 5 seconds after the start of measurement is preferably 0.050 to 0.075 And 0.051 to 0.075 are more preferable. When the luminescence intensity of Zr is 0.050 or more, the surface smoothness of the coating film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll Even in the case where the opening area of the cell is small, the ink in the cell of the gravure printing roll can be satisfactorily transferred to the surface layer of the printing member, and a clear gradation printing with little printing omission in the light portion and the highlight portion can be obtained. When the luminescence intensity of Zr is 0.075 or less, a printing member having a surface layer comprising a coating film formed of a paint containing a pigment is preferable because blocking of the front and back surfaces of the opposing printing member is prevented satisfactorily even when it is in a wound state. .

When the pigment was analyzed by a glow discharge luminescence analysis method (GD-OES analysis method), the luminescence intensity of Zr at a depth after sputtering for 1 second after the start of the measurement has a better surface smoothness of the coating film of the paint containing the pigment, Zr in the depth after sputtering for 5 seconds after the start of the measurement since the transferability of the ink in the cell of the gravure printing roll is further improved, the transfer to the surface layer of the printing member is better, and a clearer gradation printing can be obtained. It is preferable that it is larger than the light emission intensity of.

When the coating layer contains silica, when the pigment is analyzed by a glow discharge emission analysis method (GD-OES analysis method), the light emission intensity of Si at a depth after sputtering for 1 second after the start of measurement is preferably 0.040 to 0.080 , 0.042 to 0.076 are more preferable. When the luminescence intensity of Si is 0.040 or more, the surface smoothness of the coating film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll Even in the case where the opening area of the cell is small, the ink in the cell of the gravure printing roll can be satisfactorily transferred to the surface layer of the printing member, and a clear gradation printing with almost no printing omission in the light portion and the highlight portion can be obtained. When the luminescence intensity of Si is 0.080 or less, a printing member having a surface layer comprising a coating film formed of a paint containing a pigment is preferable because blocking between the front and back surfaces of the opposing printing member is prevented satisfactorily even when in a wound state. .

When the coating layer contains silica, when the pigment is analyzed by a glow discharge emission analysis method (GD-OES analysis method), the light emission intensity of Si at a depth after sputtering for 5 seconds after the start of measurement is preferably 0.020 to 0.080 , 0.021 to 0.077 are more preferable, and 0.022 to 0.065 are particularly preferable. When the luminescence intensity of Si is 0.020 or more, the surface smoothness of the coating film (surface layer of the printing member) containing the pigment is excellent, the transferability of the ink in the cells of the gravure printing roll is improved, and as a result, the gravure printing roll Even in the case where the opening area of the cell is small, the ink in the cell of the gravure printing roll can be satisfactorily transferred to the surface layer of the printing member, and a clear gradation printing with almost no printing omission in the light portion and the highlight portion can be obtained. When the luminescence intensity of Si is 0.080 or less, a printing member having a surface layer comprising a coating film formed of a paint containing a pigment is preferably prevented from blocking between the front and rear surfaces of the opposing printing member even when in a wound state. .

When the pigment was analyzed by the glow discharge luminescence analysis method (GD-OES analysis method), the luminescence intensity of Si at a depth after sputtering for 1 second after the start of the measurement, the coating film of the paint containing the pigment has better surface smoothness, Since the transferability of the ink in the cell of the gravure printing roll is further improved, and can be transferred to the surface layer of the printing member better, and a clearer gradation printing can be obtained, Si at the depth after sputtering for 5 seconds after the start of measurement It is preferable that it is larger than the light emission intensity of.

The glow discharge emission analysis method (GD-OES analysis method) is an analysis method as described below. Argon ions generated by discharge in an argon atmosphere enter the sample surface serving as the cathode surface, and a phenomenon called sputtering occurs, and atoms, electrons, and charged particles based on constituent elements are released from the sample surface. Atoms emitted from the sample surface are excited by inelastic collisions with electrons during glow discharge and emit element-specific light. The light is divided for each wavelength by a spectrometer, and its intensity is measured to analyze the elements. By performing sputtering sequentially, the distribution of elements in the depth direction from the sample surface can be measured.

The glow discharge emission analysis method (GD-OES analysis method) is measured under the following measurement conditions, for example.

Apparatus: Product name "JY-5000RF type GD-OES" made by HORIBA

Gas for sputtering: Argon (Ar)

It is carried out in a pulsed manner under the following conditions.

Frequency: 100Hz, duty cycle: 0.5, pressure: 500Pa, output: 30W

Module: 6.5V, Phase: 3.5V, Gas displacement time: 10 seconds

Preliminary sputtering time: 10 seconds, target sample area: φ4mm

Background: 10 seconds, measurement time: 0 to 180 seconds

The average particle diameter of the pigment is 50 to 300 nm, preferably 100 to 300 nm, and more preferably 200 to 300 nm. When the average particle diameter of the pigment is 50 nm or more, the pigment is difficult to aggregate and is preferable. When the average particle diameter of the pigment is 300 nm or less, the concealability of the coating film of the paint containing the pigment is improved, which is preferable.

The average particle diameter of the pigment is measured using a laser diffraction/scattering type particle size distribution meter. For example, using a laser diffraction/scattering particle size distribution system commercially available from Horiba Seisakusho under the trade name "LA-920", dispersion solvent: ethanol, circulation rate: 4, ultrasonic dispersion: volume average of 1 minute The particle diameter is measured, and the volume average particle diameter is taken as the average particle diameter of the pigment.

A skin layer containing an organic compound may be integrally formed on the coating layer of the pigment. The skin layer may be partially formed on the surface of the inorganic fine particles, but is preferably formed on 90% or more of the surface area of the inorganic fine particles, and is formed on the entire surface of the inorganic fine particles (100% of the surface area of the inorganic fine particles). desirable. The pigment is excellent in affinity with the binder contained in the paint, as long as the skin layer containing the organic compound is formed on the surface, and is finely dispersed without agglomeration in the paint, and the pigment aggregates even in the surface layer formed of the paint. It is not dispersed. Therefore, the surface layer formed of the paint has excellent surface smoothness, and the ink in the cell of the gravure printing roll can be better transferred to the surface layer of the printing member, so that a clear gradation printing can be obtained.

The binder contained in the paint is not particularly limited, and examples thereof include vinyl chloride resin, acrylic resin, alkyd resin, polyester resin, polyurethane resin, chlorinated polyolefin resin, and amorphous polyolefin resin.

It is preferable that it contains a fatty acid or polyol as an organic compound. As fatty acids, octanoic acid, nonanoic acid and decanoic acid are preferred. In addition, the fatty acids may be used alone or in combination of two or more.

The polyol is not particularly limited as long as it has a plurality of hydroxyl groups (-OH) in one molecule, but is selected from the group consisting of trimethylolpropane, trimethylolethane, ditrimethylolpropane, pentaerythritol and trimethylolpropaneethoxylate. At least one alcohol is preferable, and at least one alcohol selected from the group consisting of trimethylolpropane, ditrimethylolpropane and pentaerythritol is more preferable. Moreover, polyol may be used independently and 2 or more types may be used together.

The paint contains the pigment and the binder. In order to adjust the viscosity of the paint, a solvent may be contained as necessary. As a solvent, methyl ethyl ketone, toluene, ethyl acetate, etc. are mentioned, for example.

The content of the pigment in the coating material is preferably 50 to 400 parts by mass, more preferably 100 to 300 parts by mass, and particularly preferably 100 to 150 parts by mass relative to 100 parts by mass of the binder. When the content of the pigment in the coating is within the above range, the coating film formed of the coating has excellent surface smoothness and can smoothly transfer ink in the cells of the gravure printing roll. Therefore, by gravure printing, it is possible to obtain a sophisticated gradation printing having sophisticated light portions and highlight portions without printing omission.

In the coating, within the range not impairing its physical properties, ultraviolet absorbers, light stabilizers, antioxidants, thermal polymerization inhibitors, leveling agents, antifoaming agents, thickeners, anti-settling agents, infrared absorbers, fluorescent brighteners, dispersants, conductive fine particles, antistatic agents Additives, such as an anti-fogging agent and a coupling agent, may be contained.

The coating is applied to one surface of the printing substrate to form a surface layer, and a coating film of the coating is formed on the coating surface of the coating in the printing substrate, and this coating film forms a surface layer (not to be printed) which becomes the printing surface.

The coating material is applied to the surface of the printing substrate 1 on which gravure printing is performed, followed by drying as necessary to form a coating film, which constitutes the surface layer 2. The surface layer 2 formed on the printing substrate 1 serves as a printing surface for performing gravure printing (see Fig. 1).

The printing base material 1 is not particularly limited as long as it is a conventionally known base material on which gravure printing is performed, and examples thereof include metal foils such as aluminum foil, synthetic resin films, and paper.

The printing substrate 1 on which the surface layer 2 is formed facilitates the separation of the ink contained in the cells of the gravure printing roll. Therefore, in the gravure printing roll, the cells of the gravure printing roll, which correspond to the light portion and especially the highlight portion, although the opening area is small, the separation of the ink from these cells is also easily performed, so that the light portion and especially the highlight It is possible to form a beautiful gradation print without omission of printing even in the part.

Specifically, in the case of performing gravure printing on the printing substrate 1, the printing substrate 1 is formed between the gravure printing roll 3 and the backup roll 4 facing the gravure printing roll 3 as a surface layer ( 2) The gravure printing roll 3 is supplied in an opposite state, the surface layer 2 on the printing substrate 1 is pressed against the surface of the gravure printing roll 3 by the backup roll 4, and the gravure printing roll By transferring the ink C stored in the cell 31 of (3) to the surface layer 2 on the printing substrate 1, the printing substrate 1 is released from the surface of the gravure printing roll 3, thereby transferring the printing substrate Gravure printing is performed on the surface of (1).

When the surface layer 2 on the printing substrate 1 is pressed against the surface of the gravure printing roll 3, since the surface layer 2 has excellent surface smoothness, the ink C in the cell 31 is the surface layer 2 It is transferred to the side with high precision, and on the surface layer 2, printing corresponding to the shape of the cell 31 of the gravure printing roll 3 is performed.

As described above, the shape of the cell 31 of the gravure printing roll 3 in that the ink C in the cell 31 of the gravure printing roll 3 is easily and easily transferred onto the surface layer 2 with high precision. Even if the (opening of the cell 31) is fine, the ink C in the cell 31 is accurately transferred onto the surface layer 2. Therefore, the printing base material 1 on which the surface layer 2 is formed can be suitably used for gradation printing by gravure printing.

The printing member including the printing substrate 1 and the surface layer 2 integrally laminated on the surface of the printing substrate 1 can be suitably used as a sealing sheet of a PTP package. Specifically, the PTP package 5 has a storage sheet 51 and a storage sheet 51 having a plurality of tablet storage portions 51a for housing the tablets B, as shown in FIG. 3. It has a sealing sheet 52 for closing the opening of the tablet storage portion 51a. The tablet (B) includes a drug having a certain shape, and a capsule or the like. By pressing the tablet storage portion 51a of the storage sheet 51 against the sealing sheet 52 side, the sealing sheet 52 is split, and the tablet B stored in the tablet storage portion 51a can be taken out. .

The storage sheet 51 is usually formed in a planar rectangular shape, and a plurality of tablet storage portions 51a are formed by partially expanding a known synthetic resin sheet using a general-purpose thermoforming method. Moreover, as a synthetic resin which comprises a synthetic resin sheet, polyester resin, such as a polyethylene terephthalate sheet, polyvinyl chloride resin, such as polyvinyl chloride, polystyrene resin, etc. are mentioned, for example. As a thermoforming method, a vacuum forming method, a pressure-forming method, etc. are mentioned, for example.

And, as shown in Fig. 3, a sealing sheet for closing the opening of the tablet storage portion 51a on the surface 51b where the opening of the tablet storage portion 51a in the storage sheet 51 is formed 52 is integrally laminated.

The sealing sheet 52 has a printing member A and a gravure printing layer 53 integrally formed on the surface layer 2 of the printing member A. The printing member A has a printing substrate 1 and a surface layer 2 formed on the printing substrate 1. The surface layer 2 contains the coating film of the said coating material. The gravure printing layer 53 is formed by printing on the surface layer 2 by gravure printing, and includes gradation printing. In addition, although the PTP package in the state where the gravure printing layer 53 is exposed outward is shown in FIG. 3, the gravure printing layer 53 may be made inside (storing sheet 51 side).

Gradient printing printed on the surface layer 2 of the printing member A is a beautiful and sophisticated print with no printing omission even in the light portion and the highlight portion, and various designs can be given to the PTP package 5. have.

<Example>

Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited by these examples.

(Examples 1 to 6 and Comparative Examples 1 and 2)

On the surface of the titanium oxide fine particles, a coating layer comprising zinc oxide, zirconium oxide and silica is formed integrally, and a skin layer comprising the organic compound shown in Table 1 is integrally formed on the coating layer. Pigments were prepared. Table 1 shows the average particle diameter of the pigment.

For the pigment, the luminescence intensities of Zn, Zr and Si in the depth after sputtering for 1 second after the start of measurement by the glow discharge emission analysis method (GD-OES analysis method) are shown in the "After 1 second" column of Table 1.

For the pigment, the luminescence intensities of Zn, Zr, and Si in the depth after sputtering for 5 seconds after the start of measurement by the glow discharge emission analysis method (GD-OES analysis method) are shown in the "After 5 seconds" column of Table 1.

As a binder, a vinyl chloride-vinyl acetate-fumaric acid copolymer (vinyl chloride component: 84 mass%, vinyl acetate component: 15 mass%, fumaric acid component: 1 mass%) is 15 mass%, the pigment is 20 mass%, and as a solvent A coating material was prepared by uniformly mixing methyl ethyl ketone so as to be 65 mass%.

As a printing substrate, an aluminum foil having a thickness of 20 µm was prepared, a coating was applied to one side of the aluminum foil, dried, and a surface layer was formed on one side of the aluminum foil to produce a printing member.

As the ink, red ink (trade name ``MBA Gold A'' manufactured by Fuji Ink Kogyo Co., Ltd.), navy blue ink (trade name ``MBA primary color man A'' manufactured by Fuji Ink Kogyo Co., Ltd.), full color ink (trade name ``MBANo.1 Full A'' made by Fuji Ink Kogyo Co., Ltd.) , Brown ink (trade name "MBANo.3 Gal A" manufactured by Fuji Ink Kogyo Co., Ltd.) and pink ink (trade name "MBA pink A" manufactured by Fuji Ink Kogyo Co., Ltd.) were prepared.

A gravure printing roll, the area of the aperture with a 25㎛ ^2, 15㎛ ^2, 5.0㎛ ² or 2.5㎛ ² the cells were prepared. Further, a cell having an opening area of 5.0 µm ² corresponds to a cell forming a light portion for gradation printing. A cell having an opening area of 2.5 µm ² corresponds to a cell forming a highlight portion of gradation printing.

A gravure printing layer was formed on the surface layer 2 of the printing member by gravure printing using the ink and the gravure printing roll.

About the obtained gravure printing, transferability was measured by the following method, and the results are shown in Tables 2 and 3.

(Warrior)

The gravure printing layer formed on the surface layer of the printing member was photographed under a microscope at a magnification of 200. In the micrograph, the measurement section of a flat square shape with one side of 1 mm (actual dimension) was arbitrarily determined, and the number of printed dots (number of prints) in the measurement section was measured. In addition, the number of cells of the gravure printing roll contacting the measurement section was measured. The transfer rate was calculated based on the following formula. It evaluated based on the following criteria from the transfer rate. In addition, the number of prints and the number of cells of the gravure printing roll were targeted only when they completely entered the measurement section.

Transfer rate (%) = 100 × number of prints/number of cells

A… The transfer rate was 95% or more.

B… The transfer rate was 90% or more and less than 95%.

C… The transfer rate was 70% or more and less than 90%.

D… The transfer rate was less than 70%.

According to the printing substrate having a surface layer formed using the coating material containing the pigment of the present invention, it is possible to perform sophisticated gradation printing on the surface layer by gravure printing. The coating material and printing member of the present invention can be suitably used for the use of a pharmaceutical package such as a PTP package.

Printing with various designs can be performed on the surface layer of the printing member constituting the sealing sheet of the PTP package, and various designs can be given to the PTP package. Therefore, the pharmacist can easily identify the PTP package, and can effectively prevent a prescription miss.

(Cross reference of related applications)

This application claims priority based on Japanese Patent Application No. 2017-194687 filed on October 4, 2017, and the disclosure of this application is incorporated herein by reference in its entirety.

1: printing equipment
2: Surface layer
3: gravure printing roll
4: Backup roll
5: PTP package
51: storage sheet
51a: Tablet storage
52: sealing sheet
53: gravure printing layer
A: Printing absence
B: tablet

Claims (5)

The luminescence intensity of Zn at the depth after sputtering for 1 second after the start of measurement by the glow discharge luminescence analysis method (GD-OES analysis method), having a coating layer formed on the surface of the inorganic fine particles and the inorganic fine particles and containing a metal oxide Is 0.005 to 0.015, further characterized in that the luminescence intensity of Zn at the depth after sputtering for 5 seconds after the start of the measurement is 0.003 to 0.013, and the average particle diameter is 50 to 300 nm. According to claim 1,
The emission intensity of Zr at the depth after sputtering for 1 second after the start of measurement by the glow discharge emission analysis method (GD-OES analysis method) is 0.065 to 0.090, and the emission of Zr at the depth after sputtering for 5 seconds after the start of measurement Pigment characterized in that the strength is 0.050 to 0.075. The method according to claim 1 or 2,
The light emission intensity of Si at the depth after sputtering for 1 second after the start of measurement by the glow discharge emission analysis method (GD-OES analysis method) is 0.040 to 0.080, and the light emission of Si at the depth after sputtering for 5 seconds after the start of measurement Pigment characterized in that the strength is 0.020 to 0.080. A coating material for forming a surface layer serving as a printing surface on a printing substrate for gravure printing, wherein the coating material contains the pigment according to claim 1. A printing member for printing gravure, comprising a printing substrate and a surface layer integrally laminated on the surface of the printing substrate and comprising a coating film of the paint according to claim 4.

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