JP2019189290A - Packaging material with indicator function - Google Patents

Abstract

To provide a packaging material which has enough shading performance, and has an oxide indicator function.SOLUTION: A packaging material is formed by arranging an oxide detection region 3 and a shading region 2 on a base material film 1. The oxide detection region 3 is formed by laminating an ultraviolet screening anchor coat layer 31 and an oxide indicator ink layer 32, and on the other hand, the shading region 2 is formed by printing shading ink. And the oxide detection region 3 and the shading region 2 are arranged as remaining a gap between both regions without coming in contact mutually, and the gap between the oxide detection region and the shading region is buried by a black ink layer 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging material suitable for containing contents that are easily damaged by oxygen gas or light.

  Some foods or pharmaceuticals are rotted or altered in the presence of oxygen gas or when exposed to light.

  For this reason, for example, in the case of containing contents that are easily damaged by light, a light-shielding packaging container or packaging material is generally used. In the case of storing contents that are easily damaged by oxygen gas, an oxygen gas barrier material is used as a packaging container or packaging material, and the inside thereof is maintained in an oxygen-free state.

  As a method for maintaining the inside of the package body in an oxygen-free state, for example, a vacuum method, a replacement package for replacement with an inert gas, or a method of introducing an oxygen absorbent into the package body is known, In any case, it is impossible to completely prevent an accident that oxygen gas enters from the outside of the package.

  For this reason, in the case of these oxygen-free packaging, when oxygen gas enters from the outside, an oxygen indicator function for displaying the fact may be provided. This oxygen indicator function is realized, for example, by printing oxygen indicator ink that changes color in the presence of oxygen gas on a packaging material. When oxygen gas enters the inside of the package, the oxygen indicator ink layer is discolored by the oxygen gas, and the fact can be easily discriminated by the naked eye. Of course, if the oxygen indicator ink layer is not discolored, it can be assumed that oxygen gas has not entered, that is, the inside of the package is maintained in an oxygen-free state.

  By the way, since such an oxygen indicator ink layer reacts with oxygen gas that has entered the inside of the package, it must be arranged on the inner surface side of the packaging material, that is, inside the package. On the other hand, the presence or absence of discoloration of the oxygen indicator ink layer needs to be recognized by observing from the outer surface before opening the package. For this reason, the packaging material having the oxygen indicator ink layer is limited to a transparent material.

  Patent document 1 is disclosing the packaging material which provided the oxygen indicator ink layer through the yellow anchor coat layer in the base film which comprises a packaging material. Since the packaging material is transparent, the presence or absence of discoloration of the oxygen indicator ink layer can be observed from the outside of the package. Further, since the yellow anchor coat layer absorbs and blocks ultraviolet rays, the contents can be protected from the ultraviolet rays.

  However, of course, such a yellow anchor coat layer does not have sufficient light blocking properties. That is, it is insufficient to accommodate contents that are easily damaged by both oxygen gas and light.

Japanese Patent No. 3912126

  Accordingly, an object of the present invention is to provide a packaging material having sufficient light shielding properties and having an oxygen indicator function.

That is, the invention according to claim 1 is a packaging material with an indicator function configured by arranging an oxygen detection region and a light shielding region on a base film,
The oxygen detection area is configured by laminating an ultraviolet blocking anchor coat layer and an oxygen indicator ink layer, while the light shielding area is configured by printing light shielding ink.
The oxygen detection area and the light shielding area are arranged without leaving a gap between them without contacting each other.
A packaging material material with an indicator function, characterized in that a dark partition ink layer is filled in a gap between the oxygen detection region and the light shielding region.

  Next, the invention according to claim 2 is the packaging material with an indicator function according to claim 1, wherein a backing ink layer is laminated on the oxygen detection region.

  Next, the invention according to claim 3 is the packaging material with an indicator function according to claim 1 or 2, wherein the light-shielding ink is made of white ink.

  The packaging material of the present invention has a light shielding region. In this packaging material, there is a region without a light-shielding region, but this region without a light-shielding region is occupied by an oxygen detection region and a dark partition ink layer, and the oxygen detection region has an ultraviolet blocking anchor. Since the coat layer is disposed, ultraviolet rays are blocked in any of these regions. In addition, it is clear that the light-shielding property is high as compared with the case where the ultraviolet-shielding anchor coat layer is disposed on the whole without the light-shielding region.

  In addition to the UV blocking anchor coat layer, an oxygen indicator ink layer is disposed in the oxygen detection area without the light shielding area. When oxygen gas enters the package, the oxygen indicator ink layer changes color. The fact is displayed outside the package.

  As described above, the packaging material of the present invention has a sufficient light-shielding property and also has an oxygen indicator function for detecting and displaying oxygen gas that has entered the inside of the package.

  In general, the oxygen indicator ink layer is inferior in adhesion to the light shielding ink layer. For this reason, when the oxygen indicator ink layer and the light shielding ink layer are overlapped with each other, peeling easily occurs at the interface. In the packaging material of the invention, these oxygen indicator ink layer and the light-shielding ink layer are not in contact with each other and are arranged leaving a gap between them, and the black ink layer fills the gap, No peeling occurs between the oxygen indicator ink layer and the light shielding ink layer.

FIG. 1 is a cross-sectional view for explaining a specific example of the packaging material of the present invention.

  The present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view for explaining a specific example of the packaging material of the present invention.

  As can be seen from FIG. 1, the packaging material 10 according to the present invention is configured by arranging an oxygen detection region 3 and a light shielding region 2 on a base film 1.

  The base film 1 may be an arbitrary film and may have a single layer structure or a multilayer structure, but a film excellent in oxygen gas barrier properties and transparency can be preferably used. Examples of such a film excellent in oxygen gas barrier properties and transparency include a polyamide film and an ethylene-vinyl alcohol copolymer film. In addition, an inorganic vapor-deposited film constituted by vapor-depositing an inorganic compound such as silicon oxide or aluminum oxide on a vapor deposition base material can be used as an oxygen gas barrier property and a transparent film. Of course, a film having a multilayer structure in which another transparent film is laminated on the oxygen gas barrier and transparent film may be used. For example, a film having a multilayer structure in which a polyester film or a polyolefin film is laminated on a polyamide film, an ethylene-vinyl alcohol copolymer film, or an inorganic vapor deposition film.

  The light shielding area 2 functions to block light from outside the package when the packaging material 10 is used to seal the contents. In order to perform such a light shielding function, it is desirable to provide the light shielding region 2 on the entire surface of the packaging material 10. Since it is necessary, it is necessary to provide the light shielding region 2 except for the oxygen detection region 3. For this reason, it is necessary to provide the light shielding region 2 in a pattern rather than the entire surface of the packaging material 10. However, it is desirable to provide the light shielding region 2 as wide as possible. That is, it is desirable to arrange the light shielding region 2 on almost the entire surface excluding the oxygen detection region 3.

  The light shielding region 2 can be formed, for example, by printing oily light shielding ink containing a white pigment. As the white pigment, titanium oxide or zinc oxide can be used. The ink vehicle may be a urethane resin. As a printing method, for example, a gravure printing method can be adopted. Since the white pigment in the ink reflects and scatters not only visible light but also ultraviolet rays, the light-shielding region 2 printed and formed in this way can block light traveling from the outside to the inside of the package.

  Next, the oxygen detection region 3 needs to be composed of at least two layers of an ultraviolet blocking anchor coat layer 31 and an oxygen indicator ink layer 32. In addition, it is possible to have a layer that does not hinder the color display of the oxygen indicator ink layer 32. In this example, the oxygen indicator ink layer 31, the oxygen indicator ink layer 32, and the backing ink layer 33 are laminated in order from the base film 1 side.

  The ultraviolet blocking anchor coat layer 31 improves the adhesion between the base film 1 and the oxygen indicator ink layer 32 and has a function of blocking ultraviolet rays. As will be described later, the colorant contained in the oxygen indicator ink layer 32 may be discolored over time by the irradiation of ultraviolet rays, and this discoloration hinders the ability to detect oxygen gas. By blocking, the deterioration of the oxygen indicator ink layer 32 is prevented. Moreover, since the ultraviolet rays are blocked in this way, it is possible to prevent the ultraviolet rays from being poured into the package body and to prevent the contents from being deteriorated. Thus, the ultraviolet blocking anchor coat layer 31 prevents ultraviolet rays outside the package from reaching both the oxygen indicator ink layer 32 and the contents, and the base film 1 and the oxygen indicator ink layer. Therefore, it must be interposed between the base film 1 and the oxygen indicator ink layer 32.

  The ultraviolet blocking anchor coat layer 31 needs to have transparency enough to recognize the color of the oxygen indicator ink layer 32 from the outside of the package.

  Therefore, such an ultraviolet blocking anchor coat layer 31 can be provided by mixing and printing a known anchor coating agent with an ultraviolet blocking transparent colorant. For example, an ink in which a transparent colorant is mixed with a urethane anchor coating agent. The color of the transparent colorant may be yellow, red, crimson, white, vermilion, orange, etc., but it can effectively determine whether or not the oxygen indicator ink layer 32 is discolored by effectively absorbing and blocking ultraviolet rays. Dyes or pigments are preferred.

  The ultraviolet blocking anchor coat layer 31 can be formed by coating or printing by a conventionally known method. The ultraviolet blocking anchor coat layer 31 is desirably thin, for example, 3 μm or less.

  Next, the oxygen indicator ink layer 32 is discolored by oxygen gas that has entered the inside of the package, and the fact is displayed on the outer surface of the package. Such an oxygen indicator ink layer 32 is well known, and for example, an ink containing a redox dye and a reducing agent can be used. In addition, various additives may be contained.

  Conventionally known materials may be used for the redox dye and the reducing agent. For example, as a redox pigment, methylene blue, new methylene blue, neutral red, indigo carmine, acid red, safranin T, phenosafranine, capri blue, nile blue, diphenylamine, xylene cyanol, nitrodiphenylamine, ferroin, N-phenyl Anthranilic acid or the like can be used. As the reducing agent, ascorbic acid or a salt thereof, erythorbic acid or a salt thereof, D-arabinose, D-erythrose, D-galactose, D-xylose, D-glucose, D-mannose, D-fructose, D- Reducing sugars such as lactose, metal salts such as stannous salts and ferrous salts can be used.

  Then, the oxygen indicator ink layer 32 can be formed by mixing these components with a resin binder and an aqueous solvent and applying or printing them. A polyvinyl butyral resin can be used as the ink vehicle. As a printing method, for example, gravure printing can be adopted.

  Next, the backing ink layer 33 constitutes the background of the oxygen indicator ink layer 32 and makes it easy to see the presence or absence of the color change. The backing ink layer 33 can be formed by printing a printing ink containing a white or light pigment. As the white pigment, titanium oxide or zinc oxide can be used. The ink vehicle may be a urethane resin. As a printing method, for example, a gravure printing method can be adopted.

  Next, as can be seen from FIG. 1, in the packaging material 10, the oxygen detection region 3 and the light shielding region 2 are not in contact with each other, and are disposed so as to leave a gap therebetween. Since the white light-shielding ink constituting the light-shielding region 2 and the ink constituting the oxygen indicator ink layer 32 have poor adhesion, if both ends overlap each other, they may be peeled off from the overlapping ends. is there. In order to prevent this, it is necessary to arrange both through a gap so that the ends do not overlap each other.

  A dark-colored compartment ink layer 4 is provided in the gap, and the compartment ink layer 4 fills the gap between the oxygen detection region 3 and the light shielding region 2. For this reason, although there is a gap between the oxygen detection region 3 and the light shielding region 2, light does not pour into the package from the gap.

The partition ink layer 4 can be formed by printing a printing ink containing a dark pigment such as black, brown, or amber. Carbon black is suitable as the black pigment. The ink vehicle may be a urethane resin. As a printing method, for example, a gravure printing method can be adopted.

  This packaging material 1 can be manufactured through the following steps.

  That is, first, the partition ink layer 4 made of black ink is printed and formed on the base film 1, and then the white light shielding ink is printed to form the light shielding region 2. At this time, the light shielding property may be improved by overprinting the light shielding ink many times. Further, the white light-shielding ink may be printed so that the edge thereof overlaps the edge of the partition ink layer 4, but it should be avoided that a gap remains between the light-shielding region 2 and the partition ink layer 4. is there.

  Next, the ultraviolet ray blocking anchor coat layer 31, the oxygen indicator ink layer 32, and the backing ink layer 33 made of white ink are printed in this order on the oxygen detection region 3, whereby the packaging material 10 can be manufactured. The ultraviolet blocking anchor coat layer 31, the oxygen indicator ink layer 32, and the backing ink layer 33 can be formed by overprinting many times.

  A packaging bag can be obtained by laminating a sealant layer on the inner surface side of the packaging material 10, that is, the backing ink layer 33 side and sealing it appropriately. As the sealant layer, polyolefin resins such as polyethylene and polypropylene can be used.

10: Packaging material 1: Base film 2: Light shielding area 3: Oxygen detection area 31: UV blocking anchor coat layer 32: Oxygen indicator ink layer 33: Backing ink layer 4: Partition ink layer

Claims (3)

A packaging material with an indicator function configured by arranging an oxygen detection region and a light shielding region on a base film,
The oxygen detection area is configured by laminating an ultraviolet blocking anchor coat layer and an oxygen indicator ink layer, while the light shielding area is configured by printing light shielding ink.
The oxygen detection area and the light shielding area are arranged without leaving a gap between them without contacting each other.
A packaging material with an indicator function, wherein a gap between the oxygen detection region and the light shielding region is filled with a dark-colored partition ink layer.   The packaging material with an indicator function according to claim 1, wherein a backing ink layer is laminated on the oxygen detection region.   The packaging material with an indicator function according to claim 1 or 2, wherein the light-shielding ink is composed of white ink.

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