JP2024041431A - Glitter laminate and packaging bag - Google Patents

Abstract

[Problem] To provide a glittering laminate in which, even though it has a glossy layer using a printing ink containing metal particles and a white ink layer, the white ink layer does not look dull, and a packaging bag using this laminate. [Solution] A laminate having a structure in which at least an outer layer film 12a, a first adhesive layer 12b, a picture print layer 12c, a white print layer 12d, a transparent film 12e, a glossy layer 12f, a second adhesive layer 12g, and a sealant layer 12h are laminated in this order, the glossy layer containing metal particles, the picture print layer 12c and the white print layer 12d are printed on one side of the transparent film 12e, and the glossy layer 12f is disposed on the other side of the transparent film 12e. [Selected Figure] Figure 2

Description

The present invention relates to a laminate with a high-brightness metallic luster and a packaging bag made using the same.

Some products, such as cosmetics, are packaged with packaging materials that create a sense of luxury and luxury and appeal to the appeal of the product, thereby increasing consumers' desire to purchase. May have a high-brightness metallic luster.

Many of these products have been packaged, for example, in bottles using blister packs or skin packs as packaging materials. In such cases, it has been common practice to impart metallic luster to the mounts of blister packs and shrink packs. Blister packs are made by forming a plastic sheet using a method such as vacuum forming to form a recess for storing the product, and then storing the product in the recess and fixing the product by stacking a backing paper on top of the backing paper. A product is placed on the paper, and the product is shrink-wrapped together with a mount using shrink film. The product is placed on a metallic glossy mount and wrapped in a package that allows the product to be seen through. Because it has a metallic luster, it creates a sense of luxury and luxury, which increases the desire to purchase it.

In recent years, in order to address issues such as lowering packaging costs and reducing the volume of waste, there has been a demand for packaging bags to accommodate the bottles, etc., instead of blister packs and shrink packs. Even when a packaging bag is used instead of a blister pack or shrink pack, the packaging bag is required to have a high brightness metallic luster, like the blister pack or shrink pack described above. In addition to the high-intensity metallic luster, there is also a demand for a part of the container to have a transparent window so that the bottles etc. contained therein can be seen through.

In such a packaging bag, the product can be seen through the transparent window, and the inside surface of the packaging bag has a luxurious metallic luster, which spreads around the product that can be seen through. Similar to blister packs and shrink packs, it can create a sense of luxury and luxury and increase the desire to purchase.

By the way, various methods are known for imparting high-intensity metallic luster to packaging bags. For example, there is a method of providing a metal vapor deposition film on a film (packaging film) constituting the packaging bag. According to this method, a high brightness metallic luster can be imparted, but since the metal vapor deposition film is provided on the entire surface of the packaging film, a part of it must be removed in order to provide a transparent window for seeing through the contents. There is a need. By printing a resist film in a pattern on the metal vapor deposited film and removing the metal vapor deposited film by etching with an alkaline etching solution, this removed portion can be used as the transparent window, but according to this method, Since a resist film is printed on a metal vapor-deposited film, its ink adhesion and pattern reproducibility are poor. It is difficult to register the printed pattern and the transparent window. There are various problems such as pre-printed patterns being damaged by the alkaline etching solution.

On the other hand, by using a printing ink containing metal particles and printing on the packaging film with this printing ink, it is possible to give the packaging film a high-brightness metallic luster and provide a transparent window for viewing the contents. It is.

Patent Document 1 proposes a laminate or a packaging bag that uses a printing ink (silver ink) containing metal particles to impart a high-brightness metallic luster and is provided with a transparent window for seeing through the contents. ing. That is, in the packaging bag of Patent Document 1, three types of ink layers are provided. The first type is a silver ink layer formed with silver ink. The second type is a white ink layer that forms the background of the pattern. The third type is a pattern ink layer, which is usually printed in multiple colors. These three types of ink layers include a silver ink layer disposed on the innermost side of the packaging bag, that is, closer to the sealant layer, and a white ink layer covering the silver ink layer on the outer surface side. With this white ink layer as a background, the pattern ink layer is arranged on the outer surface side of the white ink layer. Note that there is a portion where none of the silver ink layer, pattern ink layer, and white ink layer are printed, and the inside of the packaging bag can be seen through this unprinted portion.

However, in Patent Document 1, since the glossy layer printed with silver ink and the white ink layer printed with white ink are stacked adjacent to each other, the silver ink constituting the glossy layer is applied to the white ink layer. When viewed from the outer surface side, that is, from the white ink layer, the white ink layer has a drawback that it appears grayish.

Japanese Patent Application Publication No. 2018-108860

Therefore, the present invention provides a glittering laminate in which the white ink layer does not appear dull even though it has a glossy layer and a white ink layer using printing ink containing metal particles, and a glittering laminate that uses this laminate. The purpose is to provide packaging bags with

That is, in the invention according to claim 1, at least the outer film, the first adhesive layer, the pattern printing layer, the white printing layer, the transparent film, the glossy layer, the second adhesive layer, and the sealant layer are arranged in this order. A laminate having a laminated structure,
the glossy layer contains metal particles,
The glitter laminate is characterized in that the pattern printing layer and the white printing layer are printed on one side of the transparent film, and the glossy layer is arranged on the other side of the transparent film. .

The metal particles are preferably made of metal scales. The glossy layer can be formed by printing a printing ink containing a binder resin in addition to the metal scale powder.

The glossy layer can also be formed by printing a printing ink containing at least two isocyanates containing two or more functional groups. By using, as the printing ink constituting the glossy layer, a printing ink containing at least an isocyanate containing two or more functional groups, it is possible to improve the adhesion of the glossy layer.

This laminate may also be provided with a window portion that can be partially seen through. By providing the window in this way, when a packaging bag is made using this laminate, it becomes possible to see through the contents through the window.

In addition, when a film with a three-layer structure in which a white printed layer and a glossy layer are arranged on both sides of a transparent film is used as a glitter film among the layer configurations of the laminate, diffused light is irradiated from the white printed layer side. , when the color coordinates are calculated from the spectra of reflected light excluding regular reflected light, L
It is preferable that L* in the *a*b* color space is 80 or more. L* in the L*a*b* color space corresponds to lightness. The fact that L* calculated from the spectrum of the reflected light after irradiating the white printed layer with a diffused light beam is 80 or more means that the white printed layer or the glossy layer observed through the white printed layer It means that the brightness is high and it is not dull and gray. For this reason, the brightness of the glossy layer also increases.

The laminate may be used as at least one of the front and back films constituting the packaging bag, and the front and back films may be stacked on top of each other and the periphery may be heat-sealed to form a packaging bag.

According to the present invention, since the white printed layer and the glossy layer containing metal particles are formed on the front and back sides of the transparent film, the white printed layer and the glossy layer are not in direct contact with each other. Therefore, the glossy layer does not get into the unevenness of the white printed layer, and the high-intensity gloss inherent to the glossy layer can be observed not only when observed from the glossy layer side but also when observed from the white printed layer. can.

FIG. 1 is a perspective view of a packaging bag according to an embodiment of the present invention. FIG. 2 is an explanatory cross-sectional view of a glitter laminate that constitutes a packaging bag according to an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a packaging bag according to an embodiment of the present invention, and FIG. 2 is a cross-sectional explanatory view of a laminate forming the packaging bag.

This packaging bag 10 is formed by stacking front and back films 11 and 12 on top of each other and heat-sealing the periphery. In FIG. 1, 1x indicates a seal line around the packaging bag 10. This packaging bag 10 is a four-sided sealed bag in which all four circumferences are heat-sealed, but it may also be a three-sided sealed bag in which one film is folded to form the front and back films 11 and 12 and sealed on three sides excluding the fold line. Alternatively, it may be a pillow bag, a gusset bag, or a so-called standing pouch.

At least one of these front and back films 11 and 12 is made of a glittering laminate. In this embodiment, the back side film 12 is made of a glittering laminate.

The film 12 on the back side, that is, the glitter laminate has a layer structure as shown in FIG. That is, first, a transparent film 12e is used as an intermediate layer, a white printed layer 12d is printed on the outer surface of the packaging bag 10, and a glossy layer 12f is arranged on the inner surface. As described above, since the white printed layer 12d and the glossy layer 12f containing metal particles are formed on the front and back sides of the transparent film 12e, the white printed layer and the glossy layer are not in direct contact with each other. Therefore, the glossy layer does not get into the unevenness of the white printed layer, and the high-intensity gloss inherent to the glossy layer can be observed not only when observed from the glossy layer side but also when observed from the white printed layer. can.

When a film with a three-layer structure in which the white printed layer 12d and the glossy layer 12f are arranged on both sides of the transparent film 12e is used as a glitter film, the outer surface side of the packaging bag of this glitter film, that is, the white printed layer When color coordinates are calculated from the spectra of reflected light excluding specularly reflected light by irradiating diffused light from the side, it is desirable that L* in the L*a*b* color space be 80 or more. When L* in the L*a*b* color space is 80 or more, the white printed layer 12d or the glossy layer 12f observed through the white printed layer 12d is not dull gray and has high brightness. It means to have.

Next, on the outer surface of the packaging bag 10 made of the glitter film, a pattern printing layer 12c is printed on top of the white printing layer 12d. This pattern printing layer 12c is used to explain or appeal to consumers the product contained inside the packaging bag 10, and is a color printed pattern that includes the product name, product type, manufacturer and seller information, etc. It is normal that there is. A first adhesive layer 12b is interposed between the pattern printing layer 12c and the outer film 12a, and the intermediate layer and the outer film 12a are bonded together by the first adhesive layer 12b.

On the other hand, a sealant layer 12h is adhered to the inner surface of the glitter film packaging bag 10 via a second adhesive layer 12g.

A window portion 1y is provided in a part of this back side film 12 made of a glittering laminate. This window portion 1y is an area where none of the pattern printing layer 12c, the white printing layer 12d, and the glossy layer 12f is provided, and the other side can be seen through from one side of the film 12 on the back side. Therefore, in the packaging bag 10 made using this backside film 12, the product inside the packaging bag 10 can be seen through this window.

Next, the outer layer film 12a and the intermediate layer transparent film 12e may be composed of resin films having a single layer structure or a multilayer structure. Examples of single-layer resin films include polyester films and polyamide films. Further, as a resin film having a multilayer structure, a multilayer structure obtained by laminating other resin layers on these polyester films or polyamide films can also be used. Alternatively, the outer layer may be a multilayered film that partially includes a transparent vacuum-deposited layer. An example of the transparent vacuum-deposited layer is a vacuum-deposited layer of an inorganic oxide. For example, a vacuum deposited layer of silicon oxide or aluminum oxide.

The white printed layer 12d can be formed by printing a commonly used white ink on the outer surface of the packaging bag 10 of the transparent film 12e. The printing pattern covers the entire area except for the window portion 1y. The printing method may be a gravure printing method, a screen printing method, or the like.

Moreover, the pattern printing layer 12c can be formed by overlapping printing on this white printing layer 12d. Similar to the white printed layer 12d, the pattern printed layer 12c needs to be printed on areas other than the window portion 1y, but does not need to be printed on the entire area where the white printed layer 12d is formed. As described above, the pattern printing layer 12c is used to explain or appeal to consumers the product stored inside the packaging bag 10, and can be printed in multiple colors.

Next, the glossy layer 12f imparts high-intensity gloss to the front film 12 made of a glittering laminate, creates a sense of luxury and luxury, and emphasizes the appeal of the product. This glossy layer 12f can be formed by blending metal particles with a binder resin to form printing ink, and printing this on the inner surface of the packaging bag 10 of the transparent film 12e. The printing pattern covers the entire area except for the window portion 1y. Since the white printed layer 12d and the glossy layer 12f are both printed on the entire area except the window 1y with the transparent film 12e in between, when viewed from the inside of the packaging bag 10, as well as the outside. Even when viewed from the side, the high-brightness luster inherent to the glossy layer can be observed.

By the way, metal scales can be preferably used as the metal particles. By forming the glossy layer 12f using metal scale powder, it is possible to express gloss with even higher brightness.

Furthermore, by adding a curing agent containing isocyanate or more having two or more functional groups to the printing ink and printing the ink, the adhesion between the formed glossy layer 12f and the transparent film 12e can be improved.

The glossy layer 12f can also be printed using methods such as gravure printing and screen printing.

Next, polyolefin resin can be used as the sealant layer 12h. For example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer These are polyolefin resins such as EAA, ionomer, and polypropylene. These resins may be formed into a film using an extruder and used in the form of a film.

A dry laminating adhesive can be used as the first adhesive layer 12b and the second adhesive layer 12g. Examples include two-component curing urethane adhesive, polyester urethane adhesive, polyether urethane adhesive, acrylic adhesive, polyester adhesive, polyamide adhesive, epoxy adhesive, and the like.

Next, the back film 12 made of this photoluminescent laminate can be manufactured by the following process.

That is, first, a white printing layer 12d and a pattern printing layer 12c are sequentially printed on one side of the transparent film 12e. Next, a glossy layer 12f is formed on the other surface of the transparent film 12e in alignment with the white printed layer 12d. Note that the formation order of these layers is arbitrary as long as it is a reasonable order. For example, after forming the glossy layer 12f on the other side of the transparent film 12e, the white printing layer 12d and the pattern printing layer 12c can be printed on one side. Further, the pattern printing layer 12c can be formed after forming the white printing layer 12d and the glossy layer 12f.

Next, the surface of the pattern printing layer 12c and the outer film 12a are bonded together via the first adhesive layer 12b. Further, the surface of the glossy layer 12f and the sealant layer 12h are bonded together via the second adhesive layer 12g. The order of these adhesion is also arbitrary.

Note that a method of manufacturing a packaging bag using this glittering laminate 12 is also well known.

(Example 1)
In this example, only the back side film 12 constituting the packaging bag 10 is made of a glittering laminate. Note that the front film 11 has the same layer structure as the back film 12, except that it does not have a window.

First, as the outer layer film 12a of the back side film 12 and the intermediate layer transparent film 12e, polyester films with a thickness of 12 μm were used.

Then, a white printed layer 12d was printed on one side of the transparent film 12e. The white printed layer 12d was printed on the entire surface of the layer except for a window 1y.

Further, metal scale powder was blended with a binder resin, and a curing agent consisting of a polysensitized isocyanate compound was further added to prepare a printing ink, which was printed on the other side of the transparent film 12e to form a glossy layer 12f. The glossy layer 12f is aligned with the white printed layer 12d and is printed on the entire surface other than the window 1y, thereby disposing the white printed layer 12d and the glossy layer 12f on both sides of the transparent film 12e, respectively. A glittering film with a three-layer structure was produced.

When a diffused light beam was irradiated from the outer surface side of the packaging bag of this glitter film, that is, from the side of the white printed layer 12d, and the color coordinates were calculated from the spectra of the reflected light excluding specularly reflected light, L*a*b* L* in color space was 80.4. From this result, it was found that this glittering film did not turn gray even when observed from the white printed layer 12d side, and exhibited high brightness and gloss.

Next, a pattern printing layer 12c was printed on the white printing layer 12d. The pattern printing layer 12c was printed in multiple colors, and was partially printed on the white printing layer 12d so as not to cover the window 1y.

Then, the surface on the pattern printing layer 12c side of the transparent film 12e provided with the white printing layer 12d, the pattern printing layer 12c, and the glossy layer 12f faces the outer layer film 12a, and adhesive lamination is performed via the first adhesive layer 12b. At the same time, the surface of the transparent film 12e on the glossy layer 12f side and the sealant layer 12h were faced to each other and adhesive laminated using the second adhesive layer 12g to produce the back side film 12. As the sealant layer 12h, a polyolefin film with a thickness of 70 μm was used.

The layer structure of the back side film 12 thus obtained is expressed as "PET/adhesive layer/pattern/white/PET/glossy layer/adhesive layer/sealant" by expressing "/" between the layers. express. However, this expression does not express the presence or absence of the window portion 1y.

Next, the front side film 11 also has the same layer structure as the back side film 12, except that it does not have a window section. That is, the layer structure of the front film 11 is also "PET/adhesive layer/pattern/white/PET/glossy layer/adhesive layer/sealant".

Then, the front side film 11 and the back side film 12 were stacked and heat-sealed around the four sides to produce a four-sided sealed bag shown in FIG. 1.

(Example 2)
In this example as well, only the back side film 12 constituting the packaging bag 10 is made of a glittering laminate. Note that the front film 11 has the same layer structure as the back film 12, except that it does not have a white printed layer and a glossy layer.

The layer structure of the back side film 12 is the same as the back side film 12 of Example 1: "PET/adhesive layer/pattern/white/PET/glossy layer/adhesive layer/sealant". This back side film 12 is provided with a window portion 1y.

The layer structure of the front film 11 is "PET/adhesive layer/pattern/PET/adhesive layer/sealant".

(Example 3)
In this example as well, only the back side film 12 constituting the packaging bag 10 is made of a glittering laminate.

The back side film 12 is the same as the back side film 12 of Example 1, except that a stretched polyamide film (ONy) is used as the intermediate layer transparent film 12e. The layer structure is "PET/adhesive layer/pattern/white/ONy/glossy layer/adhesive layer/sealant". This back side film 12 is provided with a window portion 1y.

Moreover, the front side film 11 is the same as the front side film 11 of Example 2. The layer structure is "PET/adhesive layer/pattern/PET/adhesive layer/sealant".

(Example 4)
In this example as well, only the back side film 12 constituting the packaging bag 10 is made of a glittering laminate.

The layer structure of the back side film 12 is the same as the back side film 12 of Example 1: "PET/adhesive layer/design/white/PET/glossy layer/adhesive layer/sealant". This back side film 12 is provided with a window portion 1y.

The front film 11 is the same as the front film 11 of Example 2, except that a stretched polyamide film (ONy) is used as the intermediate layer transparent film 11e. The layer structure is "PET/adhesive layer/pattern/ONy/adhesive layer/sealant".

(Example 5)
This example is similar to Example 2, except that no curing agent was added to the glossy layer of backside film 12.

Therefore, the layer structure of the back side film 12 is "PET/adhesive layer/pattern/white/PET/glossy layer/adhesive layer/sealant".

The layer structure of the front film 11 is "PET/adhesive layer/pattern/PET/adhesive layer/sealant".

(Example 6)
This example was implemented with the exception that in addition to not adding a curing agent to the glossy layer of the back side film 12, a polyester film (VMPET) provided with a transparent inorganic vapor-deposited film was used as the intermediate layer transparent film 11e. This is similar to Example 2.

That is, the layer structure of the back side film 12 is "PET/adhesive layer/pattern/white/VMPET/glossy layer/adhesive layer/sealant".

The layer structure of the front film 11 is "PET/adhesive layer/pattern/PET/adhesive layer/sealant".

(Example 7)
This example is the same as Example 2 except that the white printed layer 12d and the glossy layer 12f of the back side film 12 were not provided with the window portion 1y.

That is, the layer structure of the back side film 12 is "PET/adhesive layer/pattern/white/PET/glossy layer/adhesive layer/sealant". However, the window portion 1y is not provided.

The layer structure of the front film 11 is PET/adhesive layer/pattern/PET/adhesive layer/sealant.

(Comparative example 1)
This example is the same as Example 2 except for this point, except that the lamination order of the glitter films is changed.

In this example, a glossy layer was printed on the inner surface of the packaging bag of the transparent film of the intermediate layer, and a white printed layer was printed on the glossy layer to obtain a glitter film. Note that both the glossy layer and the white printed layer were formed on the entire surface except for the window portion. Then, a pattern printing layer was formed on the outer surface of the packaging bag of the transparent film serving as the intermediate layer.

Then, the surface of the transparent film with the picture print layer, gloss layer, and white print layer facing the outer film was adhesively laminated via a first adhesive layer, and the surface of the transparent film with the white print layer facing the sealant layer was adhesively laminated via a second adhesive layer to produce a backside film.

The layer structure of the resulting backside film is "PET/adhesive layer/pattern/PET/glossy layer/white/adhesive layer/sealant."

The layer structure of the front film is the same as that of the front film 11 of Example 2, which is "PET/adhesive layer/design/PET/adhesive layer/sealant".

Then, these front side films and back side films were stacked and heat-sealed on all four sides to produce a four-sided sealed bag.

(Comparative example 2)
This example is also the same as Example 2, except that the lamination order of the glitter films is changed.

In this example, a glossy layer was printed on the outer surface of the packaging bag of the transparent film of the intermediate layer, and a white printed layer was printed on the glossy layer to obtain a glitter film. Note that both the white printed layer and the glossy layer were formed on the entire surface except for the window portion.

When a diffused light beam was irradiated from the outer surface side of the packaging bag of this Glitter 9 film, that is, from the side of the white printed layer 12d, and the color coordinates were calculated from the spectrum of the reflected light excluding specularly reflected light, L*a*b* L* in color space was 37.0. As described above, it can be understood that when the glossy layer and the white printed layer are formed in a stacked manner so that they are in direct contact with each other, the brightness thereof decreases and the brightness of the gloss decreases.

Next, a pattern printing layer was formed on the white printing layer of the intermediate layer.

Then, the surface of the transparent film provided with the pattern printing layer, the glossy layer, and the white printing layer on the pattern printing layer side and the outer layer film are faced to each other, and the transparent film is adhesively laminated via the first adhesive layer. The white printed layer side and the sealant layer were placed facing each other and adhesively laminated with a second adhesive layer to produce a back side film.

The layer structure of the obtained backside film is "PET/adhesive layer/pattern/white/glossy layer/PET/adhesive layer/sealant".

The layer structure of the front film is the same as that of the front film 11 of Example 2, which is "PET/adhesive layer/design/PET/adhesive layer/sealant".

Then, these front side films and back side films were stacked and heat-sealed on all four sides to produce a four-sided sealed bag.

Next, Table 1 shows the visibility and brightness of the packaging bags of Examples 1 to 7 when observed from the back side. Table 1 also shows the adhesion of the glossy layer.

10: Packaging bag 1x: Seal line 1y: Window 11: Front side film 12: Back side film 12a: Outer layer film 12b: First adhesive layer 12c: Design printing layer 12d: White printing layer 12e: Transparent film 12f: Glossy layer 12g: Second adhesive layer 12h: Sealant layer

Claims (6)

A laminate having a structure in which at least an outer film, a first adhesive layer, a pattern printing layer, a white printing layer, a transparent film, a glossy layer, a second adhesive layer, and a sealant layer are laminated in this order. hand,
the glossy layer contains metal particles,
A glitter laminate, characterized in that the pattern printing layer and the white printing layer are printed on one side of the transparent film, and the glossy layer is arranged on the other side of the transparent film. 2. The glitter laminate according to claim 1, wherein the metal particles are made of metal scale powder, and the gloss layer is formed by printing a printing ink containing a binder resin in addition to the metal scale powder. 2. The glitter laminate according to claim 1, wherein the glossy layer is formed by printing with a printing ink containing at least one isocyanate containing two or more functional groups. The glittering laminate according to claim 1, wherein a part of the glittering laminate is provided with a transparent window. Among the layer configurations of the laminate, when a film with a three-layer structure in which a white printed layer and a glossy layer are arranged on both sides of a transparent film is used as a glitter film, a diffused light beam is emitted from the white printed layer side of the glitter film. 2. The method according to claim 1, wherein L* in the L*a*b* color space is 80 or more when the color coordinates are calculated from the spectroscopic spectrum of the reflected light excluding specularly reflected light. Photoluminescent laminate. A packaging bag formed by overlapping front and back films and heat sealing the periphery,
A packaging bag characterized in that at least one of the front and back films is made of the glitter laminate according to any one of claims 1 to 5.

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