TWI783053B - Pigments, coatings and printing components - Google Patents

Abstract

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

Description

Pigments, coatings and printing components

The invention relates to a pigment, a paint and a printing component.

Currently, medical products that require a doctor's prescription are prescribed by a pharmacist based on the prescription in a hospital or a dispensing pharmacy. When pharmacists identify pharmaceuticals, they often identify them based on the printing on the packaging of the pharmaceuticals. Therefore, in order to distinguish the packaging of medical pharmaceuticals from other pharmaceuticals, it has been conceived to use various fonts, color tones, patterns, and the like.

However, the types of pharmaceuticals are increasing, and there are cases where the designs of packages of pharmaceuticals are similar. The similarity in package design may lead to prescription errors. Therefore, in order to realize the diversification of the package design of pharmaceuticals, it is desired to use gradation printing in the printing of the package.

On the other hand, in order to prevent prescription errors, it is stipulated that PTP (press-through package) packaging must be attached with a barcode on the surface of the lid. Therefore, the surface of the cover material of almost all PTP packages is pure white printed on the entire surface using white paint.

When gradation printing is carried out on pure white printing, although there will be no problem in the dark part, but in the light part (bright part), and especially the part with only a small amount of ink attached (highlight part), the ink is almost undisturbed. The problem of non-printed state (missing print) due to transfer.

Then, in Patent Document 1, a gravure printing ink for surface printing containing an inert fine particle filler having an average particle diameter of 0.5 to 2.5 μm, a pigment, a binder resin, and a solvent is proposed. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2009-114256

[Problem to be Solved by the Invention]

However, even if the above-mentioned gravure printing ink for surface printing is used, there is a problem that missing printing occurs in the bright color part and the highlight part.

Then, the inventors conducted various studies, and as a result, found that the properties of the printing surface of the printing substrate to be subjected to gravure printing affect gradation printing similarly to gravure printing ink.

The present invention provides a pigment capable of forming a surface layer capable of performing gradation printing well on a printing substrate to be gravure printed, a coating using the same, and a printing member using the coating. [Technical means to solve the problem]

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

The paint containing the pigment of the present invention can form a surface layer suitable for gradient printing on the surface of the printing substrate to be gravure printed.

The surface layer formed using the coating material of the present invention is to make the surface of the gravure printing roll contact with the surface layer of the printing surface of the printing member, so that the ink contained in the cells of the gravure printing roll can be reliably transferred to The surface layer of the printing member.

Therefore, in the case of performing gradation printing using gravure printing on the surface layer of a printing member formed using a paint containing the pigment of the present invention, both the dark portion and the light portion, especially the bright portion and the high Beautiful printing can be performed on bright parts, so that beautiful gradient printing can be obtained.

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

As the inorganic fine particles, it is only necessary that the surface layer formed by the paint containing the pigment can form the printing surface to be gravure printed. As the inorganic fine particles, it is preferable to make the surface layer formed by the paint white.

Examples of inorganic fine particles include silicon dioxide (silica) fine particles, zinc oxide fine particles, titanium oxide fine particles, zirconia fine particles, aluminum oxide fine particles, tin oxide fine particles, indium oxide fine particles, zirconia fine particles, antimony oxide fine particles, magnesium oxide fine particles , or composite oxide particles mainly composed of these; calcium carbonate particles, talc, clay, calcined kaolin particles, calcined calcium silicate particles, aluminum silicate particles, magnesium silicate particles, calcium phosphate particles, etc., preferably Titanium oxide particles. In addition, inorganic fine particles may be used alone or in combination of two or more.

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

The metal oxide constituting the coating layer is not particularly limited as long as it contains zinc oxide. Metal oxides other than zinc oxide include, for example, aluminum oxide (alumina), silicon dioxide, zirconia (zirconia), tin oxide, antimony oxide, and the like, with zirconium oxide and silicon dioxide being preferred. In addition, metal oxides may be used individually or in combination of 2 or more types.

The present inventors conducted various studies on the metal oxide contained in the coating layer of the pigment, and found that the distribution of the content of the metal oxide in the thickness direction of the coating layer affects the transfer of the ink contained in the cells of the gravure printing roll. sex has an impact.

Although it has not been clearly explained, if the luminous intensity of Zn at a predetermined depth from the surface of the pigment in the coating layer of the pigment, that is, the Zn content (zinc oxide content) is within a predetermined range, the coating film of the paint containing the pigment It has excellent surface smoothness, which improves the transferability of the ink in the cells of the gravure printing roller. As a result, even when the opening area of the cells of the gravure printing roll is small, the ink in the cells of the gravure printing roll can be well transferred to the surface layer of the printing member, thereby obtaining the bright color part. And the bright gradient printing with almost no missing printing in the highlight part.

Specifically, when the pigment is analyzed by the glow discharge luminescence analysis method (GD-OES analysis method), the Zn luminescence intensity at the depth after sputtering 1 second after the start of the measurement is 0.005-0.015, preferably 0.008 ~0.010. If the Zn luminous intensity is 0.005 or more, the surface smoothness of the coating film (surface layer of the printing member) of the paint containing the pigment is excellent, and the transferability of the ink in the cells of the gravure printing roller is improved. As a result, even in When the opening area of the cell of the gravure printing roller is small, the ink in the cell of the gravure printing roller can be well transferred to the surface layer of the printing member, so that almost no ink can be obtained in the bright color part and the highlight part. Clear gradient printing of missing printing. If the Zn luminous intensity is 0.015 or less, the whiteness of the coating film (surface layer of the printing member) of the paint containing the pigment becomes suitable, and excellent gradation printing can be performed.

Furthermore, when the pigment is analyzed by the glow discharge luminescence analysis method (GD-OES analysis method), the Zn luminescence intensity at the depth after sputtering 5 seconds after the start of the measurement is 0.003-0.013, preferably 0.006-0.010 . If the Zn luminous intensity is 0.003 or more, the surface smoothness of the coating film (surface layer of the printing member) of the paint containing the pigment is excellent, and the transferability of the ink in the cells of the gravure printing roller is improved. As a result, even in When the opening area of the cell of the gravure printing roller is small, the ink in the cell of the gravure printing roller can be well transferred to the surface layer of the printing member, so that almost no ink can be obtained in the bright color part and the highlight part. Clear gradient printing of missing printing. If the Zn luminous intensity is 0.013 or less, the whiteness of the coating film (surface layer of the printing member) of the paint containing the pigment becomes suitable, and excellent gradation printing can be performed.

When the pigment is analyzed by the glow discharge luminescence analysis method (GD-OES analysis method), the measurement of the Zn luminous intensity at the depth after sputtering 1 second after the start can make the coating film of the paint containing the pigment more excellent. Surface smoothness, the transferability of the ink in the cells of the gravure printing roller is further improved, and the surface layer of the printing member can be transferred better, so that a more vivid gradient printing can be obtained, so it is better to be greater than the beginning of the measurement The Zn luminescence intensity at the depth after sputtering for the last 5 seconds.

In addition, when zirconia is contained in the coating layer, when the pigment is analyzed by the glow discharge optical emission analysis method (GD-OES analysis method), the Zr emission intensity at the depth after sputtering for 1 second after the start is measured. Preferably it is 0.065-0.090, more preferably 0.067-0.089. If the Zr luminous intensity is 0.065 or more, the surface smoothness of the coating film (surface layer of the printing member) of the paint containing the pigment is excellent, and the transferability of the ink in the cells of the gravure printing roller is improved. As a result, even in When the opening area of the cell of the gravure printing roller is small, the ink in the cell of the gravure printing roller can be well transferred to the surface layer of the printing member, so that almost no ink can be obtained in the bright color part and the highlight part. Clear gradient printing of missing printing. If the Zr luminous intensity is 0.090 or less, the whiteness of the coating film (surface layer of the printing member) of the paint containing the pigment becomes suitable, and excellent gradation printing can be performed.

When zirconia is contained in the coating layer, when the pigment is analyzed by the glow discharge emission analysis method (GD-OES analysis method), it is preferable to measure the Zr emission intensity at the depth after sputtering 5 seconds after the start 0.050 to 0.075, more preferably 0.051 to 0.075. If the Zr luminous intensity is 0.050 or more, the surface smoothness of the coating film (surface layer of the printing member) of the paint containing the pigment is excellent, and the transferability of the ink in the cells of the gravure printing roller is improved. As a result, even in When the opening area of the cell of the gravure printing roller is small, the ink in the cell of the gravure printing roller can be well transferred to the surface layer of the printing member, so that almost no ink can be obtained in the bright color part and the highlight part. Clear gradient printing of missing printing. If the Zr luminous intensity is 0.075 or less, a printing member having a surface layer comprising a coating film formed of a paint containing a pigment can well prevent the front and back of the facing printing member even when it is set in a rolled state. The adhesion to each other is better.

When the pigment is analyzed by the glow discharge luminescence analysis method (GD-OES analysis method), the measurement of the Zr luminescence intensity at the depth after sputtering 1 second after the start can make the coating film of the paint containing the pigment more excellent. Surface smoothness, the transferability of the ink in the cells of the gravure printing roller is further improved, and the surface layer of the printing member can be transferred better, so that a more vivid gradient printing can be obtained, so it is better to be greater than the beginning of the measurement The Zr luminescence intensity at the depth after sputtering for the last 5 seconds.

When silicon dioxide is contained in the coating layer, when the pigment is analyzed by the glow discharge optical emission analysis method (GD-OES analysis method), the emission intensity of Si at the depth after sputtering for 1 second after the start of the measurement is higher than that of It is preferably 0.040 to 0.080, more preferably 0.042 to 0.076. If the Si luminous intensity is 0.040 or more, the surface smoothness of the coating film (surface layer of the printing member) of the paint containing the pigment is excellent, and the transferability of the ink in the cells of the gravure printing roller is improved. As a result, even in When the opening area of the cell of the gravure printing roller is small, the ink in the cell of the gravure printing roller can be well transferred to the surface layer of the printing member, so that almost no ink can be obtained in the bright color part and the highlight part. Clear gradient printing of missing printing. If the Si luminous intensity is 0.080 or less, the printing member having a surface layer including a coating film formed by a paint containing a pigment can well prevent the front and back of the facing printing member even when it is set in a wound state. The adhesion to each other is better.

When silicon dioxide is contained in the coating layer, when the pigment is analyzed by the glow discharge optical emission analysis method (GD-OES analysis method), the emission intensity of Si at the depth after sputtering for 5 seconds after the start of the measurement is higher than that of Preferably, it is 0.020-0.080, more preferably, it is 0.021-0.077, and most preferably, it is 0.022-0.065. If the Si luminous intensity is 0.020 or more, the surface smoothness of the coating film (surface layer of the printing member) of the paint containing the pigment is excellent, and the transferability of the ink in the cells of the gravure printing roller is improved. As a result, even in When the opening area of the cell of the gravure printing roller is small, the ink in the cell of the gravure printing roller can be well transferred to the surface layer of the printing member, so that almost no ink can be obtained in the bright color part and the highlight part. Clear gradient printing of missing printing. If the Si luminous intensity is 0.080 or less, the printing member having a surface layer including a coating film formed by a paint containing a pigment can well prevent the front and back of the facing printing member even when it is set in a wound state. The adhesion to each other is better.

When the pigment is analyzed by the glow discharge luminescence analysis method (GD-OES analysis method), the measurement of the Si luminous intensity at the depth after sputtering 1 second after the start can make the coating film of the paint containing the pigment more excellent Surface smoothness, the transferability of the ink in the cells of the gravure printing roller is further improved, and the surface layer of the printing member can be transferred better, so that a more vivid gradient printing can be obtained, so it is better to be greater than the beginning of the measurement Si luminescence intensity at the depth after sputtering for the last 5 seconds.

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 are incident on the surface of the sample as the cathode surface, resulting in a phenomenon called sputtering, based on the release of atoms, electrons, and charged particles of constituent elements from the surface of the sample. The atoms released from the surface of the sample are excited by the inelastic collision with electrons in the glow discharge, and emit the inherent light of the element. The light is divided into wavelengths by a spectrometer and its intensity is measured for elemental analysis. The element distribution in the depth direction from the sample surface can be measured by performing sputtering sequentially.

The glow discharge emission analysis method (GD-OES analysis method) is measured under the following measurement conditions, for example. Device: "JY-5000RF Type GD-OES" manufactured by HORIBA Corporation Gas for sputtering: argon (Ar) It was carried out in pulse mode under the following conditions. Frequency: 100 Hz, duty cycle: 0.5, pressure: 500 Pa, output: 30 W Module: 6.5 V, phase: 3.5 V, gas replacement time: 10 seconds Preliminary sputtering time: 10 seconds, target sample area: f4 mm Background: 10 seconds, measurement time: 0 seconds to 180 seconds

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

The average particle size of the pigment is measured using a laser diffraction/scattering particle size distribution meter. For example, use a laser diffraction/scattering particle size distribution meter commercially available under the trade name "LA-920" from Horiba Manufacturing Co., Ltd. to measure the volume average particle size with dispersion solvent: ethanol, circulation speed: 4, ultrasonic dispersion: 1 minute, This volume average particle diameter is made into the average particle diameter of a pigment.

A skin layer containing an organic compound may also be integrally formed on the coating layer of the pigment. The skin layer can also be partially formed on the surface of the inorganic fine particles, but it is preferably formed on more than 90% of the surface area of the inorganic fine particles, more preferably formed on the entire surface of the inorganic fine particles (100% of the surface area of the inorganic fine particles). If the pigment has a skin layer containing organic compounds formed on its surface, it will have excellent affinity with the binder contained in the paint, and will not aggregate in the paint but will be finely dispersed in it, and the pigment in the surface layer formed by the paint It does not aggregate but is finely dispersed in the surface layer. Therefore, the surface layer formed by the paint has excellent surface smoothness, and the ink in the cells of the gravure printing roller can be better transferred to the surface layer of the printing member, thereby obtaining more vivid gradation printing.

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

As an organic compound, it is preferable to contain a fatty acid or a polyhydric alcohol. As the fatty acid, caprylic acid, nonanoic acid, and capric acid are preferable. In addition, fatty acid may be used individually or in combination of 2 or more types.

The polyol is not particularly limited as long as it has a plurality of hydroxyl groups (-OH) in one molecule, but is preferably selected from trimethylolpropane, trimethylolethane, bis(trimethylolpropane) , neopentylritol, and at least one alcohol in the group consisting of trimethylolpropane ethoxylate, more preferably trimethylolpropane, di(trimethylolpropane), and neopentylritol at least one alcohol of the group. In addition, a polyhydric alcohol may be used individually or in combination of 2 or more types.

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

The content of the pigment in the paint is preferably 50-400 parts by mass, more preferably 100-300 parts by mass, and most preferably 100-150 parts by mass relative to 100 parts by mass of the binder. When the content of the pigment in the paint is within the above range, the surface smoothness of the coating film formed from the paint is excellent, and the ink in the cells of the gravure printing roll can be transferred smoothly. Therefore, fine gradation printing with fine bright parts and highlight parts without missing prints can be obtained by gravure printing.

In coatings, ultraviolet absorbers, light stabilizers, antioxidants, thermal polymerization inhibitors, leveling agents, defoamers, tackifiers, anti-settling agents, and infrared absorbers can also be contained within the range that does not damage their physical properties. , Fluorescent whitening agent, dispersant, conductive particles, antistatic agent, antifogging agent, coupling agent and other additives.

The coating is used to coat one side of the printing substrate to form a surface layer, and a coating film of the coating is formed on the coating surface of the printing substrate, and the coating film forms the surface layer (printing substrate) of the printing surface.

The paint is applied to the surface of the printing substrate 1 to be subjected to gravure printing, and then dried as necessary to form a coating film, and this coating film constitutes the surface layer 2 . The surface layer 2 formed on the printing base material 1 becomes the printing surface for gravure printing (refer FIG. 1).

The printing substrate 1 is not particularly limited as long as it is a conventionally known substrate to be subjected to gravure printing, 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 makes it easy to release the ink contained in the cells of the gravure printing roll. Therefore, in the gravure printing roller, the cells of the gravure printing roller corresponding to the bright color part and especially the highlight part, although its opening area is small, the ink is also easy to detach from these cells, so that the bright color part and especially the highlight part The highlight part can also form beautiful gradient printing without missing printing.

Specifically, when performing gravure printing on the printing substrate 1, the printing substrate is supplied between the gravure printing roller 3 and the back-up roller 4 facing the gravure printing roller 3 with the surface layer 2 facing the gravure printing roller 3 1. The surface layer 2 on the printing substrate 1 is pressed against the surface of the gravure printing roller 3 by the support roller 4, and at the same time, the ink C contained in the cells 31 of the gravure printing roller 3 is transferred to the printing substrate The surface layer 2 on the surface layer 1 will release the printing substrate 1 from the surface of the gravure printing roller 3, thereby performing gravure printing on the surface of the printing substrate 1.

When the surface layer 2 on the printing substrate 1 is pressed against the surface of the gravure printing roller 3, the surface layer 2 has excellent surface smoothness, so the ink C in the cells 31 is transferred to the surface layer 2 with high precision On the surface layer 2, printing corresponding to the shape of the cell 31 of the gravure printing roller 3 is carried out.

As described above, the ink C in the cells 31 of the gravure printing roll 3 is transferred to the surface layer 2 with high precision and easily, so that even the shape of the cells 31 of the gravure printing roll 3 (openings of the cells 31 ) Fine, the ink C in the mesh cells 31 is also accurately transferred to the surface layer 2 . Therefore, the printing substrate 1 formed with the surface layer 2 can be preferably used for gradation printing by gravure printing.

Moreover, the printing member including the printing substrate 1 and the surface layer 2 integrated with the surface layer of the printing substrate 1 can be preferably used as a sealing sheet of a PTP package (press-through package). Specifically, as shown in FIG. 3 , the PTP packaging body 5 includes: a storage sheet 51 having a plurality of tablet storage parts 51 a for storing the tablets B; and a tablet storage part 51 a closing the storage sheet 51 The sealing sheet 52 of the opening. Tablet B includes medicines having a fixed shape, and also includes capsules and the like. By pushing the tablet storage part 51a of the storage sheet 51 toward the sealing sheet 52 side, the sealing sheet 52 can be torn, and the tablet B stored in the tablet storage part 51a can be taken out.

The storage sheet 51 is generally formed in a planar rectangle, and a plurality of tablet storage portions 51a are formed by partially expanding a known synthetic resin sheet using a general-purpose thermoforming method. In addition, examples of the synthetic resin constituting the synthetic resin sheet include polyester-based resins such as polyethylene terephthalate sheets, polyvinyl chloride-based resins such as polyvinyl chloride, and polystyrene-based resins. As a thermoforming method, a vacuum forming method, a pressure forming method, etc. are mentioned, for example.

Next, as shown in FIG. 3 , on the surface 51 b of the storage sheet 51 on which the opening of the tablet storage portion 51 a is formed, it is laminated and integrated with the sealing sheet 52 in order to close the opening of the tablet storage portion 51 a.

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. As shown in FIG. The printing member A has a printing base material 1 and a surface layer 2 formed on the printing base material 1 . The surface layer 2 comprises a coating film of the above-mentioned paint. The gravure printing layer 53 is formed by printing on the surface layer 2 by gravure printing, including gradation printing. In addition, in FIG. 3, the PTP package which showed the state which exposed the gravure printing layer 53 to the outside may make the gravure printing layer 53 inside (accommodating sheet 51 side).

The gradation printing printed on the surface layer 2 of the printing member A becomes beautiful and exquisite printing without missing printing in the bright color part and the highlight part, and various designs can be given to the PTP package 5 . [Example]

Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

(Examples 1 to 6 and Comparative Examples 1 and 2) The following pigments were prepared, in which a coating layer containing zinc oxide, zirconia, and silicon dioxide was integrally formed on the entire surface of titanium oxide fine particles, and a pigment containing an organic compound shown in Table 1 was integrally formed on the entire coating layer. Made of epidermis. The average particle diameter of the pigment is shown in Table 1.

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

For pigments, the Zn, Zr, and Si luminous intensities at the depth after sputtering 5 seconds after the start of the measurement by the glow discharge luminescence analysis method (GD-OES analysis method) are shown in the column of "5 seconds later" in Table 1. middle.

By making vinyl chloride-vinyl acetate-fumaric acid copolymer (vinyl chloride component: 84% by mass, vinyl acetate component: 15% by mass, fumaric acid component: 1% by mass) as a binder 15% by mass, 20% by mass of the above-mentioned pigment, and 65% by mass of methyl ethyl ketone as a solvent were uniformly mixed to prepare a paint.

An aluminum foil with a thickness of 20 μm was prepared as a printing substrate, and a paint was applied on one side of the aluminum foil and dried to form a surface layer on one side of the aluminum foil to produce a printing member.

As inks, red ink (trade name "MBA Kinchi A" manufactured by Fuji Ink Industries), blue ink (trade name "MBA Primary Blue A" manufactured by Fuji Ink Industries), grass green ink (Fuji Ink Industries Brand name "MBA No. 1 Grass A" manufactured by the company), brown ink (trade name "MBA No. 3 Cha A" manufactured by Fuji Ink Industries), and pink ink (trade name "MBApinkA" manufactured by Fuji Ink Industries) ).

A gravure printing roll having cells with an opening area of 25 μm ² , 15 μm ² , 5.0 μm ² or 2.5 μm ² was prepared. Furthermore, a cell with an opening area of 5.0 μm ² corresponds to a cell forming a bright color portion of gradation printing. A cell with an opening area of 2.5 μm ² is equivalent to a cell that forms a highlight in gradation printing.

Using the aforementioned ink and the aforementioned gravure printing roll, a gravure printing layer was formed on the surface layer 2 of the printing member by gravure printing.

About the obtained gravure printing, transferability was measured according to the following points, and the result is shown in Table 2 and Table 3.

(transferability) A microscope photograph was taken at a magnification of 200 times of the gravure printing layer formed on the surface layer of the printing member. In the microscopic photo, arbitrarily specify the measurement interval of a plane square with a side length of 1 mm (actual size), and measure the number of printed dots (number of prints) in the measurement interval. Also, the number of cells of the gravure printing roll in contact with the measurement interval was measured. The transfer rate was calculated based on the following formula. From the transfer rate, it evaluated based on the following reference|standard. Furthermore, the number of prints and the number of cells of the gravure printing roll are only calculated for those completely within the measurement range. Transfer rate (%) = 100 × printing number / mesh number

A...The transfer rate is 95% or more. B...The transfer rate is 90% or more and less than 95%. C...The transfer rate is 70% or more and less than 90%. D... The transfer rate is less than 70%.

[Table 1]

[Table 2]

[產業上之可利用性][table 3]

[Industrial availability]

According to a printing substrate having a surface layer formed using a paint containing the pigment of the present invention, delicate gradation printing can be performed on the surface layer by gravure printing. The coating and printing member of the present invention can be preferably used for pharmaceutical packaging such as PTP packaging.

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, a pharmacist can easily recognize a PTP package, and prescription errors can be effectively prevented.

(Cross-references to related applications) This application claims priority based on Japanese Patent Application No. 2017-194687 filed on October 4, 2017, and the disclosure of the application is hereby incorporated by reference in its entirety.

1‧‧‧Printing substrate 2‧‧‧surface layer 3‧‧‧Gravure printing roller 4‧‧‧Backup Roller 5‧‧‧PTP package 31‧‧‧Mesh hole 51‧‧‧Storage sheet 51a‧‧‧Tablet storage 51b‧‧‧face of the opening 52‧‧‧sealing sheet 53‧‧‧Gravure printing layer A‧‧‧Printing components B‧‧‧Tablets

Fig. 1 is a cross-sectional view showing a printed substrate integrated with a surface laminate layer. Fig. 2 is a schematic diagram showing the main points of gravure printing on the surface layer on the printing substrate. Fig. 3 is a sectional view showing an example of a PTP package.

1‧‧‧Printing substrate

2‧‧‧surface layer

Claims (6)

A pigment having inorganic microparticles and a coating layer containing metal oxide formed on the surface of the inorganic microparticles, and having a depth after sputtering 1 second after start of measurement by glow discharge luminescence analysis method (GD-OES analysis method) The Zn luminescence intensity at the bottom is 0.008~0.010, and the Zn luminescence intensity at the depth after sputtering 5 seconds after the start of the measurement is 0.005~0.008, and the Zn luminescence intensity at the depth 1 second after the start of the measurement is greater than The Zn luminescence intensity at the depth after sputtering 5 seconds after the start of the above measurement, the average particle diameter of the pigment is 50~300nm. The pigment according to claim 1, wherein the Zr luminescence intensity at the depth after sputtering 1 second after the start of the measurement by glow discharge luminescence analysis (GD-OES analysis method) is 0.077~0.081, and after the measurement starts The Zr luminous intensity at the depth after sputtering for 5 seconds is 0.059~0.063. The pigment according to Claim 1 or 2, wherein the Si luminescence intensity at the depth after sputtering 1 second after the start of the measurement by the glow discharge luminescence analysis method (GD-OES analysis method) is 0.052 to 0.059, and the measurement The Si luminous intensity at the depth after sputtering for 5 seconds after the start is 0.022-0.047. A paint for forming a surface layer to be a printing surface on a printing substrate to be subjected to gravure printing, and the paint contains the pigment described in claim 1. A printing member, which is used for gravure printing, includes a printing substrate and a surface layer, the surface layer is integrated with the surface layer of the printing substrate and includes the coating film of the coating material described in Claim 4. A sealing sheet, which has a printing member and a gravure printing layer, the printing member includes a printing substrate and a surface layer, the surface layer is integrated with the surface layer of the printing substrate and includes a coating containing the pigment described in claim 1 The coating film; the above-mentioned gravure printing layer includes gradient printing formed on the above-mentioned surface layer by gravure printing.

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