JP2012254555A - Printing ink laminated body, packaging materials with the same, and lid material for ptp package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing ink laminated body by which a printed characters can be apparently shown by irradiating infrared laser, a package using the same, and a lid material for a PTP package.SOLUTION: The printing ink laminated body 12 is constituted of a primer printing ink layer 16 formed on a base material 11, a clear layer 17 formed on the same, and a top coat printing ink layer 18 formed of on the same. By irradiating the printing matter 10 with infrared laser, the top coat printing ink layer 18 of the irradiating parts is melted, decomposed, or sublimated. Here, because the printing ink laminated body has the clear layer 17, a pattern can be apparently formed without influencing the primer printing ink layer 16.

Description

  The present invention relates to a printing ink laminate, a packaging material including the same, and a lid for a PTP packaging.

2. Description of the Related Art Conventionally, various information such as a filling and packaging process, a manufacturing date, a shelf life, and the like are printed on the inner and outer surfaces of a package by packaging such as pudding and yogurt.
As a printing method on such a package, hot printing, ink jet, engraving or the like is used.
Among them, as shown in Patent Document 1, a base layer provided on a base material, a concealing layer provided thereon and having a brightness difference that can be easily distinguished from the base layer, and an overcoat provided thereon A method of displaying various information by exposing a base layer by sublimating a printing layer such as an OP layer and a concealing layer by irradiating a CO2 laser, which is a laminate comprising a print layer (OP layer) It has been known.

JP-A-9-123606

However, in the method of sublimating the printing layer by the heat generated by laser light irradiation, the laser beam is irradiated to the laminate with different colors of the undercoat printing ink layer and the overprinting ink layer, and only the desired overprinting ink layer is applied. There was a technical difficulty that had to be sublimated accurately. In particular, for example, a white undercoat printing ink layer and a black topcoat printing ink layer are sequentially stacked on an aluminum foil base material, and only the black topcoat printing ink layer is accurately sublimated with laser light to generate a barcode. When displaying, it was difficult to finely adjust the laser light output.
Moreover, the method of sublimating the topcoat printing ink layer with a laser beam using the topcoat printing ink layer and undercoat printing ink layer from which heat resistance differs can be considered. For example, an aluminum foil base material is provided with a white heat-resistant undercoat printing ink layer, and a black heat-resistant black topcoat ink layer is formed on the undercoat printing ink layer. There is a printing method in which a black topcoat printing ink layer is sublimated by irradiating a laser beam to leave an undercoat printing ink layer. However, in this case, there is a problem that the undercoat printing ink layer is discolored by the amount of heat during sublimation of the overprinting ink layer.
An object of this invention is to provide the printing ink laminated body which can express printing clearly by irradiating an infrared laser, and the lid | cover material for a package or PTP package using the same.

  The printing ink laminate of the present invention is provided by applying or printing an undercoat printing ink layer provided by applying or printing the first colored ink on the surface of the substrate, and applying or printing a transparent ink on the undercoat printing ink layer. A clear layer, and a top printing ink layer provided by applying or printing a second colored ink of a color different from the first colored ink on the clear layer, and by irradiating an infrared laser from above The overprinting ink layer of the irradiated part can be removed to expose the undercoat printing ink layer.

In such a printing ink laminate, even if the undercoat printing ink layer is exposed through a clear layer by irradiating the infrared laser, by irradiating the infrared laser, The undercoat printing ink layer may be directly exposed.
The printing ink laminate of the present invention, further comprising an overcoat on the topcoat printing ink layer, and by irradiating an infrared laser from above the overcoat, the topcoat printing ink layer and Examples include those capable of removing the overcoat and exposing the undercoat printing ink layer.

In the present invention, there may be mentioned those in which the topcoat printing ink layer and the undercoat printing ink layer exhibit a barcode when the topcoat printing ink layer is removed by irradiation with the infrared laser.
In addition, it is preferable that the undercoat printing ink layer is white.
Furthermore, the transparent ink is preferably made of a vinyl chloride / vinyl acetate resin or a vinyl chloride / amino resin.

  The packaging material of the present invention comprises a base material and the printing ink laminate of the present invention provided on the surface of the base material.

  The lid material for the PTP package of the present invention includes a base material made of a metal foil, any one of the printing ink laminates provided on the surface of the base material, and a heat seal provided on the back surface of the base material. And an adhesive layer.

  The printing ink laminate of the present invention is provided by applying or printing an undercoat printing ink layer provided by applying or printing the first colored ink on the surface of the substrate, and applying or printing a transparent ink on the undercoat printing ink layer. A clear layer, and a top printing ink layer provided by applying or printing a second colored ink of a color different from the first colored ink on the clear layer, and by irradiating an infrared laser from above Since the undercoat printing ink layer can be removed by exposing the irradiated area, the undercoat printing ink layer can be exposed, so the clear printing ink layer can be protected by the clear layer, and the undercoat printing ink layer can be discolored or removed. A pattern such as a bar code or a character can be clearly displayed without causing it to occur.

In the printing ink laminate according to the present invention, when the undercoat printing ink layer is exposed through the clear layer by irradiating the infrared laser, the clear printing layer is removed even if the overcoating printing ink layer is removed. The undercoat printing ink layer can be protected. This is preferable when the removal conditions of the topcoat printing ink layer and the clear layer are greatly different (for example, when the heat resistant temperature is greatly different). Moreover, when the said undercoat printing ink layer is directly exposed by irradiating the said infrared laser, the energy of an infrared laser can be absorbed in a clear layer, and an undercoat printing ink layer can be protected. This is preferable when the removal conditions for the topcoat printing ink layer and the clear layer are close (particularly when the heat resistant temperature is close).
Whether the undercoat printing ink layer is exposed through the clear layer or directly exposed can be appropriately determined in consideration of the heat resistance of the first colored ink, the second colored ink, and the transparent ink to be used.
On the other hand, an overcoat is further provided on the topcoat printing ink layer, and by irradiating an infrared laser from above the overcoat, the topcoat printing ink layer and the overcoat are removed from the portion, and an undercoat printing ink layer When the film can be exposed, the overcoat can protect parts other than the irradiated part from external force or the like. Furthermore, when used as a heat-sealing lid, it can be protected from a heat-sealed sealing plate.

In the printing ink laminate according to the present invention, when the topcoat printing ink layer and the undercoat printing ink layer exhibit a barcode when the topcoat printing ink layer is removed by irradiation with the infrared laser, a barcode verification machine With this, the barcode can be surely recognized.
Moreover, when the said undercoat printing ink layer is white, the brightness difference with an overcoat printing ink layer can be clarified.
Further, when the transparent ink is made of vinyl chloride / vinyl acetate resin or vinyl chloride / amino resin, the transparent ink hardly sublimes even when irradiated with laser light, and the undercoat printing ink layer (first colored ink) ) To prevent sublimation. In this case, it is easy to expose the undercoat printing ink layer through the clear layer.

  Since the packaging material of this invention is equipped with the base material and the printing ink laminated body of this invention provided in the surface of the base material, it can display an arbitrary pattern clearly on the surface of a packaging body. .

  The lid material for the PTP packaging body of the present invention includes a base material made of a metal foil, the printing ink laminate of the present invention provided on the surface of the base material, and a heat sealing property provided on the back surface of the base material. Since an adhesive layer is provided, an arbitrary pattern can be clearly displayed on the surface of the lid.

FIG. 1a is a side sectional view showing an embodiment of the printing ink laminate of the present invention, FIG. 1b is a state diagram showing when the printing ink laminate is irradiated with an infrared laser, and FIG. It is side surface sectional drawing which shows other embodiment of a printing ink laminated body. FIG. 2a is a side sectional view showing an embodiment of the printing ink laminate of the present invention, FIG. 2b is a state diagram showing when the printing ink laminate is irradiated with an infrared laser, and FIG. It is side surface sectional drawing which shows other embodiment of a printing ink laminated body.

  The printed matter 10 in FIG. 1a is composed of a base material 11 and a printing ink laminate 12 provided on the surface thereof. By irradiating an infrared laser from above the printing ink laminate, characters are applied to the printing ink laminate 12. Etc. for forming a pattern. FIG. 1 b shows a pattern formed by irradiating the printed material 10 with an infrared laser L and removing the top printing ink layer 18 of the printing ink laminate.

As the base material 11, a metal plate, a metal foil, a synthetic resin plate, a synthetic resin thin film, or the like that can constitute a packaging container or a lid material is selected. In particular, since a metal plate or metal foil has a weak adhesion even when a pattern is directly printed, and the printed pattern is difficult to read due to reflection of the substrate, the printing ink laminate of the present invention is preferably used. Among these, an aluminum plate or an aluminum foil is particularly preferable.
Examples of the base material 11 include containers for packaging foods and pharmaceuticals, lids thereof, and packaging bags. However, its use is not particularly limited. When used as a lid, a heat-sealing adhesive layer 15 made of a thermoplastic resin is provided as shown by the imaginary line in FIG. 1a. Such a thermoplastic resin is selected depending on the material of the container to be adhered to the back surface of the substrate 11, and for example, acid-modified polypropylene or a resin composition mainly composed of acid-modified polypropylene, vinyl chloride resin, polyolefin resin. Polyester resins, ethylene / vinyl acetate resins, vinyl chloride / vinyl acetate resins, or acid-modified resins thereof.

  The printing ink laminate 12 includes an undercoat printing ink layer 16 formed on the substrate 11, a clear layer 17 formed thereon, and an overprinting ink layer 18 formed thereon. . Here, the heat resistance of the undercoat printing ink layer 16 and the clear layer 17 is equal to or slightly higher than the heat resistance of the clear layer.

The undercoat printing ink layer 16 is formed by applying or printing a first colored ink on a substrate. The first colored ink has a binder having high adhesion to the substrate and a pigment dispersed in the binder.
A well-known thing can be used as a binder of 1st coloring ink. For example, modified olefin resins, petroleum hydrocarbon resins, nitrocellulose (nitrified cotton) resins, and butyral resins are preferred. Particularly when an aluminum foil is used as a base material, modified polyolefin resins, vinyl chloride / vinyl acetate resins, epoxy resins, amino resins, nitrified cotton resins, urethane resins, and butyral resins are preferable. The heat resistance is preferably 150 degrees or more, particularly preferably 200 degrees or more.
The pigment of the first colored ink may be different from the pigment of the second colored ink, but it is preferably white because it looks as the base of the print pattern.

The clear layer 17 is formed by applying or printing a transparent ink on the undercoat printing ink layer 16. The transparent ink is made of a transparent binder whose heat resistance is equal to or lower than that of the first colored ink. In the transparent ink, a transparent pigment may be dispersed in order to diffuse the reflected light of the undercoat printing ink layer 16.
Known binders can be used as the binder for the transparent ink. Examples thereof include vinyl chloride / vinyl acetate resins, vinyl chloride / amino resins, and amino resins, and vinyl chloride / vinyl acetate resins or vinyl chloride / amino resins are particularly preferably used.
Examples of the transparent pigment of the transparent ink include transparent resin beads and glass beads.

The topcoat printing ink layer 18 is formed by printing the second colored ink on the clear layer 17. The second colored ink is composed of a binder having a heat resistance of 50 degrees or more, particularly 100 degrees or more smaller than that of the transparent ink binder, and a pigment having a color different from that of the first colored ink dispersed in the binder. Then, the pigment of the second colored ink is removed together with the melting, decomposition or sublimation of the binder.
As the binder of the second colored ink, vinyl chloride / vinyl acetate resin, nitrified cotton resin, epoxy resin, amino resin are used, and vinyl chloride / vinyl acetate resin and amino resin are particularly preferably used. It is done.
The pigment of the second colored ink may be different from the pigment of the first colored ink, but is preferably black when using white as the pigment of the first colored ink or displaying a barcode.
Thus, the top-coat printing ink layer constituted by the second colored ink can be removed by melting, decomposing or sublimating depending on the heat-resistant temperature of the binder. However, you may use the 2nd coloring ink removed depending on the heat-resistant temperature of a pigment.

Since it is constituted in this way, when this printed matter 10 is irradiated with an infrared laser, the top-coat printing ink layer 18 of the irradiated portion is melted, decomposed or sublimated. At this time, the heat also reaches the clear layer 17, but since the clear layer 17 has higher heat resistance than the topcoat printing ink layer 18, the clear layer 17 remains and does not affect the undercoat printing ink layer 16. Therefore, the pattern can be clearly formed.
Further, an overcoat layer 19 may be provided on the overprinting ink layer 18 as in the printed matter 10a of FIG. The overcoat layer 19 is configured such that its heat resistance is lower than that of the clear layer 17, and is preferably configured to be 30 degrees or more, particularly preferably 40 degrees or more. Therefore, the overcoat layer 19 is melted, decomposed or sublimated together with the overprinting ink layer 18 by irradiation with an infrared laser. Examples of such an overcoat layer 19 include epoxy resins and nitrified cotton resins.

  The printed matter 20 in FIG. 2a is composed of a base material 11 and a printing ink laminate 22 provided on the surface thereof. By irradiating an infrared laser from above the printing ink laminate, characters are applied to the printing ink laminate 22. Etc. for forming a pattern. FIG. 2 b shows a pattern formed by irradiating the printed material 20 with an infrared laser to remove the top printing ink layer 28 and the clear layer 27 of the printing ink laminate. The base material 11 is substantially the same as the base material 11 of FIG.

  The printing ink laminate 22 includes an undercoat printing ink layer 26 formed on the substrate 11, a clear layer 27 formed thereon, and an overprinting ink layer 28 formed thereon. . Here, the heat resistance of the undercoat printing ink layer 26 is configured to be higher than that of the clear layer 27 and the overcoat printing ink layer 28, and preferably 50 degrees or more, particularly preferably 100 degrees or more higher than the undercoat printing ink layer 26. It is comprised so that it may become. The clear layer 27 and the overprinting ink layer 28 may be either higher as long as they are equivalent or both are removed (sublimated) by irradiation with an infrared laser. However, it is preferable that the clear layer 27 has lower heat resistance than the overcoat printing ink layer 28 because the influence on the undercoat printing ink layer 26 is small when the clear layer 27 is removed by sublimation or the like.

  The undercoat printing ink layer 26 is formed by printing the first colored ink on the substrate 11 and is substantially the same as the undercoat printing ink layer 16 of FIG.

The clear layer 27 is formed by printing a transparent ink on the undercoat printing ink layer 26. Transparent ink consists of a binder whose melting temperature, decomposition temperature, or sublimation temperature is 50 degrees or more, especially 100 degrees or more lower than the binder of the first colored ink. The pigment of the transparent ink is removed together with the melting, decomposition or sublimation of the binder. Known binders can be used as the binder for the transparent ink. For example, vinyl chloride / vinyl acetate resin, vinyl chloride / amino resin, or amino resin is preferably used. Particularly preferably, a vinyl chloride / vinyl acetate resin or a vinyl chloride / amino resin is used. Further, in the transparent ink, a transparent pigment may be dispersed in order to diffuse the reflected light of the undercoat printing ink layer 26 as in the clear layer 17 of FIG.
Thus, the clear layer constituted by the transparent ink can be removed by melting, decomposing or sublimating depending on the heat-resistant temperature of the binder. However, when a pigment is added to the transparent ink, it may be removed depending on the heat resistant temperature of the pigment.

The topcoat printing ink layer 28 is formed by printing the second colored ink on the clear layer 27. The second colored ink has a melting temperature, a decomposition temperature or a sublimation temperature that is 50 degrees or more lower than that of the first colored ink, particularly 100 degrees or more, and a color different from the first colored ink dispersed in the binder. And pigments. The pigment of the second colored ink is removed with the melting, decomposition or sublimation of the binder. The binder of the second colored ink is preferably higher in heat resistance than the binder of the transparent ink.
A well-known thing can be used as a binder of 2nd coloring ink. In particular, nitrified cotton-based resin, vinyl chloride / vinyl acetate-based resin, amino-based resin, and epoxy-based resin are preferably used.
The pigment of the second colored ink may be different from the pigment of the first colored ink, and is preferably black like the top-printing ink layer 18 in FIG.
Thus, the top-coat printing ink layer constituted by the second colored ink can be removed by melting, decomposing or sublimating depending on the heat-resistant temperature of the binder. However, you may use the 2nd coloring ink removed depending on the heat-resistant temperature of a pigment.

Since it is configured in this manner, when the printed matter 20 is irradiated with an infrared laser, the clear layer 27 and the overprinting ink layer 28 at the irradiated portion are melted, decomposed or sublimated. At this time, the undercoat printing ink layer 26 has high heat resistance and does not affect the undercoat printing ink layer 26. Therefore, the undercoat printing ink layer 26 can be clearly exposed. When the heat resistance of the clear layer 27 is smaller than that of the overcoat printing ink layer 28, the boundary between the undercoat printing ink layer 26 and the clear layer 27 is governed by the melting, decomposition, or sublimation temperature of the clear layer 27. The influence on the ink layer 26 is small.
In addition, an overcoat layer 29 may be provided on the topcoat printing ink layer 28 as shown in FIG. 2c in order to protect it from external force. The overcoat layer 29 is configured such that its heat resistance is lower than that of the undercoat printing ink layer 26, and is preferably configured to be 30 degrees or more, particularly preferably 50 degrees or more. Therefore, the overcoat layer 29 is melted, decomposed, or sublimated together with the clear layer 27 and the topcoat printing ink layer 28 by irradiation with an infrared laser. Examples of such an overcoat layer 29 include a cellulose resin, a nitrocellulose resin, an acrylic resin, a polyamide resin, a urethane resin, and a melamine resin.

[Example 1]
Apply the first colored ink (white ink: ink with epoxy / amino resin as a binder (Opicoat ESH210 Conk White), manufactured by Osaka Printing Ink Manufacturing Co., Ltd.) to the glossy surface of 20 μm aluminum foil (base material 11). An undercoat printing ink layer 16 was formed. A transparent ink (transparent ink: an ink using an epoxy-amino resin as a binder (PTOP varnish (clear) manufactured by T & K TOKA)) is applied thereon to form a clear layer 17, and a second coloring is applied thereon. Ink (black ink: vinyl chloride / amino-based resin binder (Opicoat VEM ink, manufactured by Osaka Printing Ink Manufacturing Co., Ltd.) was applied to form a top-printing ink layer 18. Finally, an overcoat was applied from above. An overcoat layer 19 was formed by applying an agent (“LD450 silver” of nitrified cotton / acrylic resin, manufactured by Leader Co., Ltd.) to produce a printed material 10a of FIG. 1c.
The heat resistance of the ink is transparent ink> first colored ink> second colored ink.
Thereafter, the CO2 laser was irradiated to remove the topcoat printing ink layer 18 and the overcoat layer 19 to expose the undercoat printing ink layer 16 to form a barcode pattern. This was the printed matter of Example 1.

[Example 2]
The first colored ink (white ink: ink “PT” using epoxy / amino resin as a binder, manufactured by T & K TOKA Co., Ltd.) is applied to the glossy surface of 20 μm aluminum foil (base material 11), and the undercoat printing ink layer 26 Formed. Transparent ink (ink opicoat VEM clear, made by Osaka Printing Ink Mfg. Co., Ltd., made by Osaka Printing Ink Manufacturing Co., Ltd.) is applied on top of that to form clear layer 27, and second colored ink is applied on top of that. (Black ink: Nitrified cotton butyral type “TF-842 black”, manufactured by DIC Graphics Co., Ltd.) was applied to form a top printing ink layer 28. Finally, an overcoat agent (nitrified cotton / acrylic type “LD450 silver”, manufactured by Leader Co., Ltd.) was applied thereon to form an overcoat layer 29, and the printed material 20a of FIG. 2c was manufactured.
The heat resistance of the ink is first colored ink> second colored ink> transparent ink.
Thereafter, the CO2 laser was irradiated to remove the clear layer 27, the overprinting ink layer 28 and the overcoat layer 29, and the undercoat printing ink layer 26 was exposed to form a barcode pattern. This was designated as the printed material of Example 2.

[Comparative example]
Apply the first colored ink (white ink: Ink “PT” using epoxy / amino resin as a binder, manufactured by T & K TOKA Corporation) to the glossy surface of 20 μm aluminum foil (base material 11), and apply the undercoat printing ink layer. Then, apply a second colored ink (black ink: nitrified cotton butyral type “TF-842 Black”, manufactured by DIC Graphics Co., Ltd.) to form an overprint printing ink layer, and overcoat from the top. An overcoat layer was formed by applying an agent (nitrated cotton / acrylic type “LD450 Silver”, manufactured by Leader Co., Ltd.) to produce a printed matter of a comparative example.
The heat resistance of the ink is first colored ink> second colored ink.
Thereafter, irradiation with a CO2 laser was performed to remove the overprinting ink layer and the overcoat layer, and the undercoat printing ink layer was exposed to form a barcode pattern. This was used as a printed matter of a comparative example.

  The barcodes of the printed materials of Examples 1 and 2 and the comparative example were verified with a verification machine to determine the overall grade. The determination is based on whether the undercoat printing ink layer sublimates, the surface of the aluminum foil (base material) appears, or discoloration is seen in the undercoat printing ink layer, the lightness of the symbol contrast (SC) of the exposed portion of the undercoat printing ink layer Judged from.

使用機器：ＣＯ２レーザーマーカー ＳＵＮＸ製「ＬＰ−４３０」
バーコード検証機 ｗｅｂｓｃａｎ製 「Ｔｒｕｃｈｅｃｋ４０１」

Equipment used: CO2 laser marker SUNX "LP-430"
Barcode verifier "Scancheck 401" manufactured by webscan

In the printed materials of Examples 1 and 2, the barcode verifier clearly recognized the barcode printing. Further, no sublimation or discoloration of the undercoat printing ink layer was observed.
On the other hand, in the printed matter of the comparative example, when the laser power was 15%, the overprint printing ink layer remained, 30% showed the black ink residue and the AL foil, and 40% showed the AL foil.
As is clear from Table 1, by providing a clear layer between the undercoat printing ink layer and the overcoat printing ink layer, the overcoat printing ink layer can be removed cleanly without affecting the undercoat printing ink layer by the CO2 laser. did it.

DESCRIPTION OF SYMBOLS 10, 10a Printed material 11 Base material 12 Printing ink laminated body 15 Heat seal adhesive layer 16 Undercoat printing ink layer 17 Clear layer 18 Topcoat printing ink layer 19 Overcoat layer 20, 20a Printed material 22 Printing ink laminated body 26 Undercoat printing ink layer 27 Clear layer 28 Topcoat ink layer 29 Overcoat layer

Claims (9)

An undercoat printing ink layer provided by applying or printing the first colored ink on the surface of the substrate;
A clear layer provided by applying or printing a transparent ink on the undercoat printing ink layer; and
An overprinting ink layer provided on the clear layer by applying or printing a second colored ink having a different color from the first colored ink;
By irradiating the infrared laser from above, it is possible to remove the overprinting ink layer from the irradiated part and expose the undercoat printing ink layer,
Printing ink laminate. The printing ink laminate according to claim 1, wherein the undercoat printing ink layer is exposed through the clear layer by irradiating the infrared laser. The printing ink laminate according to claim 1, wherein the undercoat printing ink layer is directly exposed by irradiating the infrared laser. Further comprising an overcoat on the topcoat printing ink layer;
By irradiating an infrared laser from above the overcoat, the overcoat printing ink layer and the overcoat can be removed from the irradiated portion, and the undercoat printing ink layer can be exposed.
The printing ink laminated body in any one of Claim 1 to 3. The printing ink laminate according to claim 1, wherein the top coating ink layer and the undercoating printing ink layer exhibit a barcode when the top coating printing ink layer is removed by irradiation with the infrared laser. The undercoat printing ink layer is white,
2. The printing ink laminate according to claim 1. The printing ink laminate according to claim 1, wherein the transparent ink comprises a vinyl chloride / vinyl acetate resin or a vinyl chloride / amino resin. The packaging material provided with the base material and the printing ink laminated body in any one of Claim 1 to 7 provided in the surface of the base material. A substrate comprising a metal foil, a printing ink laminate according to any one of claims 1 to 7 provided on the surface of the substrate, and a heat-sealing adhesive layer provided on the back surface of the substrate. Lid for PTP packaging.

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