Laminate, laminate set, sheet for forming packaging bag, and packaging bag

Abstract

To provide a laminated body having high designability.SOLUTION: A laminated body set, which includes a first transparent sealant layer, a first printing film having a first transparent substrate and a first printing layer, and a second printing film having a second transparent substrate and a second printing layer, arranged in this order, with the first printing layer and the second printing layer positioned so that they overlap in plan view, a first laminated body where at least one of the aforementioned first printing layer and the second printing layer is a non-plate printing layer, a second transparent sealant layer, a third printing film having a third transparent substrate and a third printing film, and a fourth printing film with a fourth transparent substrate and a fourth printing layer are positioned so as to overlap in plan view, in this order, with the third printing layer and the fourth printing layer positioned so that they overlap in plan view, the second laminated body where at least one of the third printing layer and the fourth printing layer is a non-plate printing layer; and the first transparent sealant layer and the second transparent sealant layer being laminated to face each other.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a laminate, a laminate set, a sheet for forming a packaging bag, and a packaging bag.

Background Art

[0002] Conventionally, in packaging materials in many product fields such as foods, beverages, pharmaceuticals, and chemicals, generally, a printing layer for providing a product name, a pattern, a manufacturer name, a logo mark, a product description, etc. is formed. The printing layer is often formed by a plate printing method such as a gravure printing method or a flexographic printing method. In recent years, methods of forming a printing layer using a printing machine such as an electrophotographic method using toner or an inkjet method have also been proposed. The electrophotographic method and the inkjet method are plate-free printing methods that do not require a plate and can print a variety of patterns at once.

[0003] Patent Document 1 discloses a pouch container having, as wall portions, at least a first wall portion and a second wall portion disposed opposite to the first wall portion, and having a seal portion where the back surfaces of the respective wall portions are joined. The first and second wall portions have a base film and a sealant layer provided on the back surface side of the base film. At least one of the first and second wall portions has a plate-free printing layer formed between the base film and the sealant layer, and an edge portion of the plate-free printing layer is provided at a position away from the end face of the container.

[0004] Patent Document 2 discloses a method for manufacturing a three-side seal bag in which a master roll of a front film and a back film each printed with a pattern by digital printing is prepared, and a three-side seal is performed by combining both the front film and the back film fed out from these two master rolls to form a bag.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] In recent years, there has been a growing demand for packaging materials with high aesthetic appeal, and in particular, a wide variety of designs are required for packaging materials. The primary objective of this disclosure is to provide a laminate with high aesthetic appeal. [Means for solving the problem]

[0007] One embodiment of the present disclosure provides a laminate comprising, in this order, a transparent sealant layer, a transparent first transparent substrate, and a first printing film having a first printing layer disposed on at least one main surface side of the first transparent substrate, and a second printing film having a transparent second transparent substrate and a second printing layer disposed on at least one main surface side of the second transparent substrate, wherein the first printing layer and the second printing layer are arranged to overlap in a plan view, and at least one of the first printing layer and the second printing layer is a plateless printing layer.

[0008] Other embodiments of the present disclosure provide a laminate comprising, in this order, a transparent sealant layer, a first printing layer, a second printing layer, and a transparent substrate, wherein the first printing layer and the second printing layer are arranged to overlap in a plan view, and at least one of the first printing layer and the second printing layer is a plateless printing layer.

[0009] Other embodiments of the present disclosure include a first laminate having, in this order: a transparent first transparent sealant layer; a transparent first transparent substrate; a first printing film having a first printing layer disposed on at least one main surface side of the first transparent substrate; a transparent second transparent substrate; and a second printing film having a second printing layer disposed on at least one main surface side of the second transparent substrate, wherein the first printing layer and the second printing layer are arranged to overlap in a plan view, and at least one of the first printing layer and the second printing layer is a plateless printing layer; a transparent second transparent sealant layer; a transparent third transparent substrate; and the above A laminate set is provided, comprising: a third printing film having a third printing layer disposed on at least one main surface side of a third transparent substrate; a transparent fourth transparent substrate; and a fourth printing film having a fourth printing layer disposed on at least one main surface side of the fourth transparent substrate, in this order, wherein the third printing layer and the fourth printing layer are arranged to overlap in a plan view, and at least one of the third printing layer and the fourth printing layer is a plateless printing layer, wherein the first laminate and the second laminate are used by laminating them so that the first transparent sealant layer and the second transparent sealant layer face each other.

[0010] Other embodiments of the present disclosure provide a laminate set comprising: a third laminate having, in this order, a transparent first transparent sealant layer, a first printed layer, a second printed layer, and a transparent first transparent substrate, wherein the first printed layer and the second printed layer are arranged to overlap in a plan view, and at least one of the first and second printed layers is a plateless printed layer; and a fourth laminate having, in this order, a transparent second transparent sealant layer, a third printed layer, a fourth printed layer, and a transparent second transparent substrate, wherein the third and fourth printed layers are arranged to overlap in a plan view, and at least one of the third and fourth printed layers is a plateless printed layer, wherein the third and fourth laminates are used by being laminated so that the first transparent sealant layer and the second transparent sealant layer face each other.

[0011] Furthermore, other embodiments of the present disclosure provide a sheet for forming a packaging bag using the laminate set described above, wherein the first transparent sealant layer and the second transparent sealant layer are the same common sealant layer, the first transparent substrate and the third transparent substrate are the same transparent substrate, the second transparent substrate and the fourth transparent substrate are the same transparent substrate, the first printed layer and the third printed layer are arranged adjacently on the first common transparent substrate, the second printed layer and the fourth printed layer are arranged adjacently on the second common transparent substrate, and the common sealant layer, the first common transparent substrate, and the second common transparent substrate are laminated in this order such that the first printed layer and the second printed layer, and the third printed layer and the fourth printed layer overlap in a plan view.

[0012] Other embodiments of the present disclosure provide a sheet for forming a packaging bag using the laminate set described above, wherein the first transparent sealant layer and the second transparent sealant layer are the same common sealant layer, the first transparent substrate and the second transparent substrate are the same transparent substrate, the first printed layer and the third printed layer, and the second printed layer and the fourth printed layer are arranged adjacent to each other on the common transparent substrate, and the common sealant layer and the common transparent substrate are laminated such that the first printed layer and the second printed layer, and the third printed layer and the fourth printed layer overlap in a plan view.

[0013] Other embodiments of the present disclosure provide a packaging bag using the laminate set described above, wherein the first laminate and the second laminate are arranged such that the first transparent sealant layer and the second transparent sealant layer face each other, and the first printed layer, the second printed layer, the third printed layer, and the fourth printed layer overlap in a plan view, and the first transparent sealant layer and the second transparent sealant layer are heat-sealed in a portion of the periphery of the first laminate and the second laminate.

[0014] Other embodiments of the present disclosure provide a packaging bag using the laminate set described above, wherein the third laminate and the fourth laminate are arranged such that the first transparent sealant layer and the second transparent sealant layer face each other, and the first printed layer, the second printed layer, the third printed layer, and the fourth printed layer overlap in a plan view, and the first transparent sealant layer and the second transparent sealant layer are heat-sealed in a portion of the periphery of the third laminate and the fourth laminate. [Effects of the Invention]

[0015] This disclosure has the effect of providing a laminate that can produce packaging bags and the like that have depth and whose design can be changed depending on whether or not they contain contents. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic cross-sectional view showing an example of a laminate according to the first embodiment of the present disclosure. [Figure 2] This is a schematic cross-sectional view showing an example of a laminate according to the first embodiment of the present disclosure. [Figure 3] This is a schematic cross-sectional view showing an example of a laminate according to a second embodiment of the present disclosure. [Figure 4] This figure illustrates an example of a method for manufacturing a packaging bag forming sheet according to the first embodiment of the present disclosure. [Figure 5] This figure illustrates an example of a method for manufacturing a packaging bag forming sheet according to a second embodiment of the present disclosure. [Figure 6] This is a schematic diagram showing an example of a packaging bag forming sheet and a packaging bag using the same according to the present disclosure. [Figure 7] This figure illustrates an example of a sheet for forming a packaging bag according to the first embodiment of the present disclosure. [Modes for carrying out the invention]

[0017] Embodiments of the present disclosure will be described below with reference to the drawings and the like. However, the present disclosure can be implemented in many different modes and is not to be construed as limited to the description of the embodiments exemplified below. Also, for the purpose of making the description clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual form, but this is merely an example and does not limit the interpretation of the present disclosure. Further, in this specification and each drawing, the same reference numerals may be assigned to the same elements as those described above with respect to the previously presented drawings, and detailed descriptions may be omitted as appropriate.

[0018] In this specification, when expressing the manner of disposing one member on another member, if simply expressed as "on" or "under", unless otherwise specified, it includes both the case where another member is disposed directly above or directly below so as to contact the one member, and the case where another member is disposed above or below the one member via yet another member. Also, in this specification, when expressing the manner of disposing one member on the surface of another member, if simply expressed as "on the surface side" or "on the surface", unless otherwise specified, it includes both the case where another member is disposed directly above or directly below so as to contact the one member, and the case where another member is disposed above or below the one member via yet another member.

[0019] The inventors of the present invention studied a laminate capable of imparting high design quality to a bag or the like containing contents. As a result, when the laminate constituting the back side is visually recognized from the laminate constituting the front side in a state where two laminates are stacked, by making the design of the back-side laminate visible through the front-side laminate, it becomes possible to have a design with depth when visually recognized from the front side, and further, it was found that the change in the design can be enjoyed depending on the presence or absence of the contents. In addition, in the plate printing method, since the types of patterns that can be manufactured at one time are limited by the gravure plate and the size of the packaging material, etc., it is difficult to obtain a wide variety of patterns at one time. Therefore, there was a limit to improving the designability. On the other hand, according to the present disclosure, by making the plate-free printing layer into a laminate combined with another printing layer, the plate-free printing layer can easily change not only the pattern itself but also the size of the printed pattern. Therefore, the accuracy of alignment with the already printed film can be improved, and furthermore, compared with the plate printing method, a wide variety of patterns can be obtained. According to the present disclosure, a laminate capable of forming a bag body or the like having high designability is provided by configuring the laminate constituting the back side to be visible from the laminate constituting the front side, and in addition, using a plate-free printing layer. Hereinafter, the laminate, laminate set, sheet for forming a packaging bag, and packaging bag of the present disclosure will be described in detail.

[0020] A. Laminate (First Embodiment) The laminate of the present embodiment has a transparent sealant layer that is transparent, a first transparent base material that is transparent, and a first printing film having a first printing layer disposed on at least one main surface side of the first transparent base material, a second transparent base material that is transparent, and a second printing film having a second printing layer disposed on at least one main surface side of the second transparent base material, in this order. The first printing layer and the second printing layer are arranged so as to overlap in plan view, and at least one of the first printing layer and the second printing layer is a plate-free printing layer. The laminate of the present embodiment has high designability by being combined with other laminates using a plate-free printing layer for the reasons described above.

[0021] Figure 1 is a schematic cross-sectional view showing an example of a laminate according to this embodiment. As shown in Figures 1(a) and (b), the laminate 10 of this embodiment has a sealant layer 3, a first printing film F1, and a second printing film F2 in that order. The first printing film F1 has a first transparent substrate 1 and a first printing layer 11 disposed on at least one main surface side of the first transparent substrate 1. The second printing film F2 has a second transparent substrate 2 and a second printing layer 12 disposed on at least one main surface side of the second transparent substrate 2. In this disclosure, at least one of the first printing layer 11 and the second printing layer 12 is a plateless printing layer (indicated by the symbol D in the figure). Printing layers other than plateless printing layers include plated printing layers (indicated by the symbol G in the figure). In the laminate shown in Figure 1(a), both the first printing layer 11 and the second printing layer 12 are plateless printing layers (D). The laminate shown in Figure 1(b) has a first printing layer 11 which is a plateless printing layer (D) and a second printing layer 12 which is a plated printing layer (G).

[0022] 1. First printing film and second printing film The first printed film in this embodiment comprises a first transparent substrate and a first printed layer disposed on at least one main surface side of the first transparent substrate. The first printed layer may be disposed on the transparent sealant layer side of the first transparent substrate, or on the second printed film side of the first transparent substrate. The second printed film comprises a second transparent substrate and a second printed layer disposed on at least one main surface side of the second transparent substrate. The second printed layer may be disposed on the side of the second transparent substrate that faces the first printed film, or on the side opposite to the first printed film side, but the former is preferred from the viewpoint of scratch resistance and impact resistance.

[0023] (1) First printing layer and second printing layer In this embodiment, at least one of the first and second printing layers is a plateless printing layer. In the laminate shown in Figure 1(a), both the first printing layer 11 and the second printing layer 12 are plateless printing layers (D). In the laminate shown in Figure 1(b), the first printing layer 11 is a plateless printing layer (D), and the second printing layer 12 is a plated printing layer (G). In this embodiment, it is preferable that at least the first printing layer is a plateless printing layer. This is because, in many cases when manufacturing the laminate, the first printing layer is formed after the second printing layer, and by making the first printing layer a plateless printing layer, it is easier to obtain an effect of improving alignment accuracy.

[0024] a) Plateless printing layer and plated printing layer The plateless printing layer is formed by plateless printing methods that do not require plates, such as electrophotography and inkjet printing. The plateless printing layer contains, for example, toner containing colorants. The color (hue, lightness, saturation) of the plateless printing layer can be arbitrarily set according to the design of text, images, etc. Examples of chromatic colors include red, yellow-red, yellow, yellow-green, green, blue-green, blue, blue-violet, purple, and red-violet. The color of the plateless printing layer may also be achromatic, such as white, black, or gray. The colorants contained in the toner are not particularly limited, but may include, for example, cyan pigment, magenta pigment, yellow pigment, and black pigment. In plateless printing layers formed by electrophotography using toner, dots caused by the toner particles constituting the printing layer can be observed under a microscope. The plateless printing layer forms characters, images, etc., for example, by a single printing layer containing one type of toner, or by combining two or more printing layers containing different toners. When printing using an inkjet method, liquid inks used in inkjet printers (water-based inks or UV inks) can be used as printing ink instead of toner. In plateless printing layers formed by an inkjet method, dots caused by ink droplets can be observed. These dots are generally smaller than the dots caused by the unevenness of the printing plate in plated printing layers.

[0025] The plated printing layer is formed by conventionally known plated printing methods such as gravure printing, flexographic printing, letterpress rotary printing, and screen printing. Plated printing is a printing method that uses a plate made according to the formation pattern of the printing layer. The printing method applied to the formation of the plated printing layer is preferably gravure printing or flexographic printing, and particularly preferably gravure printing. The plated printing layer retains traces of, for example, the raised and recessed patterns of the plate.

[0026] The plated printing layer may contain, for example, a colorant and a binder resin, and may also contain various additives. The plated printing layer can be formed using conventionally known oil-based inks (solvent-based inks) or water-based inks. These inks contain, for example, a colorant, a binder resin, an optional additive, and a solvent or dispersion medium (hereinafter referred to as "solvent, etc."), in which the binder resin and colorant are dissolved or dispersed in the solvent, etc. The solvent, etc. is not particularly limited as long as it can dissolve or disperse the binder resin, etc.

[0027] The color (hue, lightness, saturation) of the plated printing layer can be arbitrarily set according to the design of the text or image, and examples include red, yellow-red, yellow, yellow-green, green, blue-green, blue, blue-violet, purple, red-violet, metallic colors (silver, gold, etc.), and pearl colors. The color of the plated printing layer may also be white, black, or gray (achromatic). The plated printing layer forms the text or image, for example, by a single printing layer containing one type of colorant, or by combining two or more printing layers containing different colorants. In plated printing, by using various spot inks, it is possible to achieve color reproduction and stability that is not possible with plateless printing. In addition, by using transparent ink, unevenness in the amount of ink applied within the printed surface can be suppressed.

[0028] b) Regarding the design In this disclosure, the first and second printing layers are printing layers for displaying images, product names, manufacturer names, logos, product descriptions, etc., and are formed in any pattern according to the images and text.

[0029] The first and second printed layers described above will have different configurations depending on whether they constitute the front or back side of a laminate, for example, when two laminates are stacked to form a bag. For example, the first and second printed layers in the laminate that constitutes the front surface are designed so that their aesthetic appeal is achieved by laminating these printed layers.

[0030] Specifically, the first printed layer in the laminate that makes up the front side may include characters (people, animals, plants, vehicles, machines, etc.), and the second printed layer in the laminate that makes up the front side may include text, product names, product or company logos, illustrations, etc.

[0031] In the case of a laminate constituting the front side, even when the first and second printed layers are laminated, it is necessary that the first printed layer constituting the back side be visible from the front side through the transparent sealant layer of the laminate constituting the back side. For example, this can be seen when the first and second printed layers are semi-transparent, or when there are areas where the first and second printed layers are not formed, and the laminate constituting the back side can be seen from these areas.

[0032] On the other hand, it is preferable that the first printed layer in the laminate constituting the back side is a design that, when combined with the design shown by the laminate constituting the front side, further enhances the aesthetic appeal. Specifically, examples include the design that forms the background of the design shown by the laminate that constitutes the front side, such as a background landscape image, or a hidden message / code (which becomes visible after opening and removing the contents).

[0033] On the other hand, the second printed layer in the laminate that constitutes the reverse side will be a design that can be accurately identified when viewed from the reverse side. Examples include barcodes, product descriptions, ingredient lists, warnings, website URLs, and QR codes (registered trademarks).

[0034] Preferably, the second printed layer in the laminate constituting the back surface is not visible when viewed from the front surface. Specifically, it is preferable to provide a concealing layer as described later, or to conceal it with the first and second printed layers of the laminate constituting the front surface, as well as the first printed layer constituting the back surface.

[0035] (2) First transparent substrate and second transparent substrate In this disclosure, the first transparent substrate and the second transparent substrate can be exemplified by single-layer films or multi-layer films of two or more layers, each composed of resins such as polyester (polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polycarbonate (PC), etc.), polyolefin (polyethylene (PE), polypropylene (PP), etc.), polyamide (nylon-6, nylon-66, etc.), polyacrylonitrile (PAN), polyimide (PI), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polymethyl methacrylate (PMMA), polyethersulfone (PES), ethylene-vinyl alcohol copolymer (EVOH), and polystyrene (PS). Alternatively, a single-layer film or multi-layer film of two or more layers composed of a composite material containing the above resins and CaCO3 (calcium carbonate) can be exemplified. An example of such a composite material is LIMEX® (manufactured by TBM Co., Ltd.), which contains calcium carbonate and polypropylene. The first transparent substrate and the second transparent substrate may each be a stretched film or an unstretched film.

[0036] The thickness of the transparent substrate is, for example, 9 μm or more, preferably 12 μm or more, when the transparent substrate is a single-layer film. On the other hand, it is, for example, 300 μm or less, preferably 200 μm or less. When the transparent substrate is a multi-layer film of two or more layers, the thickness is the result of stacking multiple single-layer films of the above thicknesses.

[0037] In this disclosure, "transparent" means transparent in the visible light range, and for example, the total light transmittance is preferably 70% or more, more preferably 80% or more, and even more preferably 90% or more. Here, the total light transmittance can be measured in accordance with JIS K7361-1, and can be measured, for example, with a haze meter HM150 manufactured by Murakami Color Technology Laboratory.

[0038] 2. Transparent sealant layer The transparent sealant layer in this disclosure is arranged so that when one laminate is folded or two laminates are stacked, the edges near the opposing edges can be heat-sealed to bond them together. Here, the sealant layer in this disclosure is transparent. This is because, as described above, when two laminates are stacked to form, for example, a bag, it is necessary to be able to see the laminate on the back side from the laminate on the front side. Furthermore, the transparent sealant layer is positioned on the side closest to the contents when the laminate is made into a bag and then packaged.

[0039] Examples of materials that can constitute the transparent sealant layer include polyolefin resins such as low-density PE (LDPE), linear low-density PE (LLDPE), medium-density PE (MDPE), high-density PE (HDPE), ethylene-vinyl acetate copolymer, propylene homopolymer, ethylene-propylene block copolymer, and ethylene-propylene random copolymer. One or more of these resins can be used. The transparent sealant layer may consist of a single layer or a multilayer structure of two or more layers. To suppress shrinkage during heat sealing, the transparent sealant layer is preferably an unoriented film made of the aforementioned resins. For example, the transparent sealant layer is preferably an unoriented propylene film (CPP).

[0040] The thickness of the transparent sealant layer is not particularly limited, but is usually preferably around 10 to 200 μm.

[0041] 3. Concealing layer In the case of the laminate of this embodiment, where the laminate constitutes the back side as described above, it is preferable that a concealing layer be placed between the first printed layer and the second printed layer.

[0042] Figure 2 is a schematic cross-sectional view showing an example of a laminate of this embodiment that includes a concealed region due to a concealing layer. The laminate shown in Figure 2(a) has a concealed region in which a concealing layer 4 is placed between the first printing layer 11, which is a plateless printing layer (D), and the second printing layer 12, which is a plated printing layer (G). The laminate shown in Figure 2(b) has a concealed region in which a concealing layer 4 is placed between the first printing layer 11, which is a plateless printing layer (D), and the second printing layer 12, which is a plateless printing layer (D).

[0043] The concealing layer 4 forms an opaque concealing region, which allows the first printing layer 11 to be concealed when the laminate is viewed from the second printing film F2 side, and when the laminate is viewed from the transparent sealant layer 3 side, specifically when the two laminates are laminated to form a bag or the like and viewed from the front side, the second printing layer 12 can be concealed. Furthermore, when the laminate is made into a bag to form a packaging bag, the second printing layer is located on the back side of the first printing layer, so it is preferable that the second printing layer plays a role in displaying the background color of the second printing layer when viewed from the back side of the bag.

[0044] By placing an opaque layer between the first and second printing layers in this way, for example, when observing the laminate from the second printing film side, the second printing layer can be viewed while suppressing show-through from the first printing layer, thereby further improving the visibility of the second printing layer. Therefore, this method is effective when high readability is required for the second printing layer (for example, text or codes related to product information).

[0045] The concealing layer is not particularly limited as long as it is a concealable layer, and examples include a layer formed using a known ink capable of concealing coloring, or a metal layer. In this disclosure, a layer formed using a known ink capable of concealing coloring is preferred. Such an opacity layer is usually a solid layer, i.e., formed over the entire surface, but it may also be formed partially, as long as it can conceal the first or second printing layer. Examples of the ink include a colored ink obtained by dissolving (or dispersing) a known colorant (dye or pigment) together with a binder resin in a solvent (or dispersion medium).

[0046] In particular, gravure printing allows for increased opacity while improving the color development of the black, red, cyan, and yellow inks in the second printing layer by layering a white ink layer and a silver ink layer. Alternatively, a white ink layer, a silver ink layer, and another white ink layer may be layered. Furthermore, by leaving a portion of the white ink layer untouched, the silver color can be made visible, creating a glossy effect only where needed. Alternatively, the white ink layer may be formed by digital printing.

[0047] 4. Others In addition to the transparent sealant layer, the first printed film, and the second printed film, the laminate of this embodiment may include layers described later at any position.

[0048] (1)Adhesive layer The laminate of this embodiment may have adhesive layers between the transparent sealant layer and the first printed film, and between the first printed film and the second printed film. The adhesive layers can be formed with conventionally known adhesives. The adhesive may be a one-component curing type, a two-component curing type, or a non-curing type. Using an adhesive with gas barrier properties can further enhance the gas barrier properties (oxygen barrier properties, water vapor barrier properties) of the packaging material. Examples of adhesives with gas barrier properties include adhesive compositions containing a polyester polyol, an isocyanate compound, and a plate-like inorganic compound.

[0049] (2) Transparent film The laminate of this embodiment may have a transparent film to give it thickness. The transparent film can be the same as the one described above in "1. First printed film and second printed film (2) First transparent substrate and second transparent substrate". Having a transparent film can improve impact resistance. It is preferable that the transparent film be placed between the transparent sealant layer and the first printed film.

[0050] (3) Gas barrier layer The laminate of this embodiment may have a gas barrier layer. The gas barrier layer, when used as a packaging bag, blocks the transmission of oxygen, water vapor, etc., between the storage area of ​​the packaging material and the external environment. The gas barrier layer may also provide light-shielding properties that block the transmission of visible light, ultraviolet rays, etc. The gas barrier layer may consist of one layer or a multilayer structure of two or more layers.

[0051] The gas barrier layer can be made of known materials. Preferably, the gas barrier layer is placed between the transparent sealant layer and the first printed film. For example, a vapor-deposited film or a coating film with gas barrier properties can be formed on the surface of the transparent sealant layer.

[0052] (4) Other printing layers The laminate of this embodiment may have other printing layers besides the first and second printing layers described above. The other printing layers may be plate-printed layers or plateless printing layers.

[0053] 5.Applications The laminate of this embodiment can be used as a sheet for forming packaging bags. The use of the sheet for forming packaging bags will be described in detail later in "D. Sheet for forming packaging bags," so a detailed explanation is omitted here. In addition to packaging bags, it can also be used as a manufacturing sheet for clear files, roll labels, shrink labels, tack labels, sticker labels, etc.

[0054] B. Laminate (Second Embodiment) A second embodiment of the laminate of the present disclosure comprises, in this order, a transparent sealant layer, a first printing layer, a second printing layer, and a transparent substrate, wherein the first printing layer and the second printing layer are arranged to overlap in a plan view, and at least one of the first printing layer and the second printing layer is a plateless printing layer.

[0055] Figure 3 is a schematic cross-sectional view showing an example of a laminate according to this embodiment. As shown in Figure 3, the laminate 20 of this embodiment has a transparent sealant layer 3, a first printing layer 11, a second printing layer 12, and a transparent substrate 5 in this order. In this embodiment, at least one of the first printing layer 11 and the second printing layer 12 is a plateless printing layer, and there may be a concealed region between the first printing layer 11 and the second printing layer 12 in which a concealing layer 4 is arranged. In the laminate shown in Figure 3(a), the first printing layer 11 is a plateless printing layer (D), and the second printing layer 12 is a plated printing layer (G). In the laminate shown in Figure 3(b), both the first printed layer 11 and the second printed layer 12 are plateless printed layers (D).

[0056] The laminate of this embodiment, by combining a plateless printing layer with another printing layer, achieves high design quality for the reasons described above. Furthermore, since the laminate of this embodiment only requires one transparent substrate, manufacturing becomes easier. In addition, material costs and environmental impact can be reduced.

[0057] Furthermore, in this embodiment, an opaque layer may be provided. The opaque layer is provided between the first printing layer and the second printing layer, forming an opaque opaque region that can conceal the first printing layer 11 when the laminate is viewed from the transparent substrate 5 side, and can conceal the second printing layer 12 when the laminate is viewed from the transparent sealant layer 3 side.

[0058] For example, when observing a laminate from the transparent substrate side, the second printed layer can be viewed while suppressing show-through from the first printed layer, thereby improving the visibility of the second printed layer. Therefore, it is effective when high readability is required for the second printed layer (for example, text or codes related to product information).

[0059] The transparent sealant layer can be the same as described in "A. Laminate (First Embodiment) 2. Transparent sealant layer" above. The first printing layer and the second printing layer can be the same as described in "A. Laminate (First Embodiment) 1. First printing film and second printing film (1) First printing layer and second printing layer" above. The transparent substrate can be the same as described in "A. Laminate (First Embodiment) 1. First printing film and second printing film (2) First transparent substrate and second transparent substrate" above. The concealing layer can be the same as the concealing layer described in "A. Laminate (First Embodiment) 3. Concealing layer" above.

[0060] Furthermore, in addition to the transparent sealant layer, the first and second printing layers, the transparent substrate, and the opacity layer, the laminate of this embodiment may include the layers described in "A. Laminate (First Embodiment) 4. Others" at any position.

[0061] The applications of the laminate of this embodiment are the same as those described in "A. Laminate (First Embodiment) 5. Applications" above.

[0062] C. Laminated Set 1. First Embodiment A first embodiment of the laminate set in this disclosure comprises, in this order: a first transparent sealant layer, a first transparent substrate, and a first printing film having a first printing layer disposed on at least one main surface side of the first transparent substrate; a second transparent substrate, and a second printing film having a second printing layer disposed on at least one main surface side of the second transparent substrate, wherein the first printing layer and the second printing layer are arranged to overlap in a plan view, and at least one of the first printing layer and the second printing layer is a plateless printing layer; a first laminate, a second transparent sealant layer, and a third transparent substrate A second laminate comprising a material and a third printed film having a third printed layer disposed on at least one main surface side of the third transparent substrate, a transparent fourth transparent substrate and a fourth printed film having a fourth printed layer disposed on at least one main surface side of the fourth transparent substrate, wherein the third printed layer and the fourth printed layer are arranged to overlap in a plan view, and at least one of the third printed layer and the fourth printed layer is a plateless printed layer, and the first laminate and the second laminate are used by laminating them so that the first transparent sealant layer and the second transparent sealant layer face each other.

[0063] The laminate set in this embodiment is a set of laminates in which two of the laminates described in "A. Laminate (First Embodiment)" are stacked and used as the front laminate and the back laminate, respectively. That is, the first laminate can be the laminate that constitutes the front side of the laminate described in "A. Laminate (First Embodiment)," and the second laminate can be the laminate that constitutes the back side of the laminate described in "A. Laminate (First Embodiment)."

[0064] Furthermore, the first transparent sealant layer of the first laminate is the same as the transparent sealant layer in the laminate described in "A. Laminate (First Embodiment)" above. Also, the second transparent sealant layer, third transparent substrate, third printing layer, fourth transparent substrate, and fourth printing layer of the second laminate are the same as the transparent sealant layer, first transparent substrate, first printing layer, second transparent substrate, and second printing layer in the laminate described in "A. Laminate (First Embodiment)" above.

[0065] Since these configurations are the same as those described in "A. Laminate (First Embodiment)" above, their explanation is omitted here.

[0066] Such a laminated set can be used, for example, for packaging bags. This can be achieved by preparing the first and second laminates, arranging the first and second transparent sealant layers of each to face each other, and then heat-sealing the perimeter to form a bag.

[0067] 2. Second Embodiment A second embodiment of the laminate set in this disclosure comprises a third laminate having a transparent first transparent sealant layer, a first printed layer, a second printed layer, and a transparent first transparent substrate in this order, wherein the first printed layer and the second printed layer are arranged to overlap in a plan view, and at least one of the first printed layer and the second printed layer is a plateless printed layer; and a fourth laminate having a transparent second transparent sealant layer, a third printed layer, a fourth printed layer, and a transparent second transparent substrate in this order, wherein the third printed layer and the fourth printed layer are arranged to overlap in a plan view, and at least one of the third printed layer and the fourth printed layer is a plateless printed layer, characterized in that the third laminate and the fourth laminate are used by being laminated such that the first transparent sealant layer and the second transparent sealant layer face each other.

[0068] The laminate set in this embodiment is a set of laminates in which two of the laminates described in "B. Laminate (Second Embodiment)" are stacked and used as the front laminate and back laminate, respectively. That is, the third laminate can be the laminate that constitutes the front side of the laminate described in "B. Laminate (Second Embodiment)," and the fourth laminate can be the laminate that constitutes the back side of the laminate described in "B. Laminate (Second Embodiment)."

[0069] Furthermore, the first transparent sealant layer and the first transparent substrate of the third laminate described above are the same as the transparent sealant layer and transparent substrate in the laminate described in "B. Laminate (Second Embodiment)" above. Also, the second transparent sealant layer, third printed layer, fourth printed layer and second transparent substrate of the fourth laminate described above are the same as the transparent sealant layer, first printed layer, second printed layer and transparent substrate in the laminate described in "B. Laminate (Second Embodiment)" above.

[0070] Since these configurations are the same as those described in "A. Laminate (First Embodiment)" above, their explanation is omitted here.

[0071] Such a laminated set can be used, for example, for packaging bags. This can be achieved by preparing the third and fourth laminates, arranging the first and second transparent sealant layers of each laminate facing each other, and then heat-sealing the perimeter to form a bag.

[0072] D. Sheet for forming packaging bags 1. First Embodiment The packaging bag forming sheet in this embodiment is a packaging bag forming sheet using the first embodiment of the laminate set described above, characterized in that the first transparent sealant layer and the second transparent sealant layer are the same common sealant layer, the first transparent substrate and the third transparent substrate are the same transparent substrate, forming a first common transparent substrate, the second transparent substrate and the fourth transparent substrate are the same transparent substrate, the first printed layer and the third printed layer are arranged adjacently on the first common transparent substrate, the second printed layer and the fourth printed layer are arranged adjacently on the second common transparent substrate, and the common sealant layer, the first common transparent substrate, and the second common transparent substrate are laminated in this order such that the first printed layer and the second printed layer, and the third printed layer and the fourth printed layer overlap in a plan view.

[0073] Figure 7 shows an example of the first embodiment of the packaging bag forming sheet described above. In this example of the first embodiment of the packaging bag forming sheet, a common sealant layer 3, a first common transparent substrate 1 in which a first printed layer (pattern C) and a third printed layer (pattern D) are arranged adjacently, and a second common transparent substrate 2 in which a second printed layer (pattern A) and a fourth printed layer (pattern B) are arranged adjacently are laminated in this order, with the first printed layer (pattern C) and the second printed layer (pattern A), and the third printed layer (pattern D) and the fourth printed layer (pattern B) being arranged to overlap in a plan view.

[0074] Figure 6 is a schematic diagram showing an example of a packaging bag forming sheet and a packaging bag using the same in this embodiment. The packaging bag forming sheet 50 shown in Figure 6(a) has a front-side laminate 51 and a back-side laminate 52 sandwiching a planned folding portion S. According to this embodiment, the front-side laminate 51 is the first laminate in "C. Laminate Set" having a first printed layer (pattern C) and a second printed layer (pattern A), and the back-side laminate 52 is the second laminate in "C. Laminate Set" having a third printed layer (pattern D) and a fourth printed layer (pattern B).

[0075] The above-mentioned packaging bag forming sheet 50 is folded at the planned folding section S, overlapped, and its peripheral edges are heat-sealed to form a sealed section 103, thereby obtaining a packaging bag 100 having a front surface 101 and a back surface 102 (Figure 6(b)).

[0076] The method for manufacturing the packaging bag forming sheet in this embodiment is not particularly limited, but for example, it can be manufactured as follows. Figure 4(a) is a diagram illustrating an example of the method for manufacturing the packaging bag forming sheet in this embodiment.

[0077] First, a second printing layer (pattern A) and a fourth printing layer (pattern B) are formed on the second common transparent substrate 2 by plateless printing (Step 1). At this time, it is preferable to apply alignment marks. Plateless printing allows for printing multiple patterns in a continuously changing manner. At this time, an opaque layer is formed in any area as needed. Next, adhesive is applied to the second printing layer (pattern A) 12 side and the first common transparent substrate 1 is bonded to it (Step 2). On the side of the first common transparent substrate 1 opposite to the second printing layer (pattern A) 12 side, a first printing layer (pattern C) and a third printing layer (pattern D) are formed by plateless printing (Step 3). At this time, alignment marks are used to align with the second and fourth printing layers. Plateless printing allows for accurate alignment and printing of multiple patterns in a continuously changing manner. Next, adhesive is applied to the first printing layer (pattern C) 11 side and the common sealant layer 3 is bonded to it (Step 4). This yields a sheet for forming packaging bags.

[0078] Figure 4(b) illustrates another example of the method for manufacturing a packaging bag forming sheet in this embodiment. First, a second printed layer (pattern A) and a fourth printed layer (pattern B) are formed on the second common transparent substrate 2 by plate printing (Step 1). At this time, it is preferable to apply alignment marks. At this time, if necessary, an opaque layer may be formed in the area of ​​the fourth printed layer (pattern B) which will become the laminate on the back side. Next, adhesive is applied to the second printed layer (pattern A) 12 side and the first common transparent substrate 1 is bonded to it (Step 2). On the side of the first common transparent substrate 1 opposite to the second printed layer (pattern A) 12 side, a first printed layer (pattern C) and a third printed layer (pattern D) are formed by plateless printing (Step 3). At this time, alignment marks are used to align with the second printed layer (pattern A) and the fourth printed layer (pattern B). Plateless printing allows for accurate alignment and enables printing of multiple patterns while continuously changing them. Next, adhesive is applied to the first printed layer (pattern C) 11 side, and the common sealant layer 3 is bonded to it (step 4). This yields a sheet for forming a packaging bag.

[0079] 2. Second Embodiment The packaging bag forming sheet in this embodiment is a packaging bag forming sheet using the second embodiment of the laminate set described above, wherein the first transparent sealant layer and the second transparent sealant layer are the same common sealant layer, the first transparent substrate and the second transparent substrate are the same transparent substrate, the first printed layer and the third printed layer, and the second printed layer and the fourth printed layer are arranged adjacent to each other on the common transparent substrate, and the common sealant layer and the common transparent substrate are laminated such that the first printed layer and the second printed layer, and the third printed layer and the fourth printed layer overlap in a plan view.

[0080] Figure 5 illustrates an example of a method for manufacturing a packaging bag forming sheet according to this embodiment. First, a second printed layer (pattern A) and a fourth printed layer (pattern B) are formed on the common transparent substrate 5 by plate printing (or plateless printing) (Step 1). At this time, it is preferable to apply marks for alignment. In addition, a concealing layer may be formed in the area of ​​the fourth printed layer (pattern B), which will be the laminate on the back side. Next, a first printed layer (pattern C) and a third printed layer (pattern D) are formed on the second printed layer (pattern A) 12 side by plateless printing (Step 2). At this time, alignment marks are used to align with the second printed layer (pattern A) and the fourth printed layer (pattern B). Plateless printing allows for highly accurate alignment and enables printing of multiple patterns with continuous variation. Next, an adhesive is applied to the first printed layer (pattern C) 11 side and the common sealant layer 3 is bonded to it (Step 3). This yields a sheet for forming a packaging bag.

[0081] The packaging bag forming sheet of this embodiment can be formed by one example of the manufacturing method described above, and consists of a common sealant layer 3 and a common transparent substrate 5 on which a second printed layer (pattern A) and a fourth printed layer (pattern B) are arranged adjacent to each other, and a first printed layer (pattern C) and a third printed layer (pattern D) are further arranged laminated on each of these printed layers, and the first printed layer (pattern C) and the second printed layer (pattern A), as well as the third printed layer (pattern D) and the fourth printed layer (pattern B), are arranged to overlap in a plan view.

[0082] Other aspects of this embodiment are the same as those of the first embodiment described above, so their explanation is omitted here.

[0083] E. Packaging bag 1. First Embodiment The packaging bag of this embodiment is a packaging bag using the first embodiment of the laminate set described above, characterized in that the first laminate and the second laminate are arranged such that the first transparent sealant layer and the second transparent sealant layer face each other, and the first printed layer, the second printed layer, the third printed layer, and the fourth printed layer overlap in a plan view, and the first transparent sealant layer and the second transparent sealant layer are heat-sealed in a portion of the periphery of the first laminate and the second laminate.

[0084] Figure 6(b) is a schematic diagram showing an example of a packaging bag according to this embodiment. The packaging bag 100 of this embodiment has a surface 101 and a back surface 102 formed by folding the first laminate and the second laminate described above so that the sealant layer is on the inside, a storage portion O capable of accommodating contents, and a sealing portion 103 formed around the storage portion, in which opposing sealant layers are sealed together. The shape of the packaging bag in this disclosure is not limited to the three-side seal bag shown in Figure 6(b), but includes, for example, pillow bags, gusset bags, stand-up pouches, etc.

[0085] In this embodiment, when the packaging bag is observed from the front side of the bag, the pattern formed by the overlapping patterns of the first and second printed layers contained on the bag surface is visible. Furthermore, the contents can be observed through the bag surface. When the contents are removed, the third printed layer on the back of the bag also becomes visible. By simultaneously viewing the third printed layer in addition to the first and second printed layers, the design can be made more intricate, and new design effects, such as using the third printed layer as a background, can be added.

[0086] Furthermore, if the back surface of the packaging bag has the aforementioned concealing layer, the fourth printed layer on the back of the bag can be reliably seen when viewed from the back side of the bag, thereby further improving the visibility of important information such as barcodes.

[0087] With the packaging bag of this embodiment, a wide variety of designs can be provided by changing the types of designs on the front and back surfaces and how they are combined. For example, the design can be such that the hidden inner design is revealed when the package is opened and the contents are removed. In this case, it is possible to provide the enjoyment of not knowing what kind of design (character, landscape, illustration, person, etc.) is hidden until purchase and opening. It can also be used for printing proof of purchase, such as serial codes, which are preferably kept hidden until opened. Furthermore, when viewed from the front side, it is possible to obtain a design with a sense of depth and three-dimensionality by overlapping the first and second printing layers on the front and the third printing layer on the back. In addition, it is possible to create a design that combines the designs of the inner printing layers on the front and back with the contents.

[0088] 2. Second Embodiment The packaging bag of this embodiment is a packaging bag using the second embodiment of the laminate set described above, characterized in that the third laminate and the fourth laminate are arranged such that the first transparent sealant layer and the second transparent sealant layer face each other, and the first printed layer, the second printed layer, the third printed layer, and the fourth printed layer overlap in a plan view, and the first transparent sealant layer and the second transparent sealant layer are heat-sealed in a portion of the periphery of the third laminate and the fourth laminate.

[0089] The packaging bag of this embodiment will be described in the same way as the packaging bag of the first embodiment described above, so its description will be omitted here.

[0090] This disclosure is not limited to the embodiments described above. The embodiments described above are illustrative, and any configuration that is substantially identical to the technical idea described in the claims of this disclosure and achieves similar effects is included within the technical scope of this disclosure. [Examples]

[0091] The present disclosure will be further described in detail by the following examples. (Example 1) As shown in Figure 4(a), a polyester (PET) film was prepared as the second common transparent substrate 2. A second printed layer (pattern A) and a fourth printed layer (pattern B) were formed adjacent to each other on one side of the polyester (PET) film by digital printing. During this process, multiple patterns were printed in a continuously changing manner. Alignment marks were also added. The polyester (PET) film becomes the outermost layer of the flexible packaging material. Adhesive was applied to the printed layer side of the polyester (PET) film on which the second printed layer (pattern A) and the fourth printed layer (pattern B) were formed, and another PET film (first common transparent substrate) was laminated to it. On the side of the first common transparent substrate opposite to the second and fourth printed layers, a first printed layer (pattern C) and a third printed layer (pattern D) were formed by digital printing. During this process, multiple patterns were printed in a continuously changing manner. Alignment marks were also used to align the patterns of the second printed layer (pattern A) and the fourth printed layer (pattern B).

[0092] An adhesive was applied to the side of a polyester (PET) film with the first printed layer (pattern C) and the third printed layer (pattern D) formed on it, and a polyethylene film (common sealant layer 3) was laminated to it. The polyethylene film becomes the innermost layer of the flexible packaging material. This resulted in a laminated sheet for forming a packaging bag.

[0093] The above-mentioned packaging bag forming sheet was processed using a three-side seal bag-making machine to form a bag. The contents were filled into the bag using a filling machine, and one open end was sealed to close it and obtain a package.

[0094] (Example 2) As shown in Figure 4(b), a polyester (PET) film was prepared as the second common transparent substrate 2. A second printed layer (pattern A) and a fourth printed layer (pattern B) were formed on one side of the polyester (PET) film by gravure printing. Alignment marks were also added. The polyester (PET) film becomes the outermost layer of the flexible packaging material. Adhesive was applied to the printed layer side of the polyester (PET) film on which the second printed layer (pattern A) and fourth printed layer (pattern B) were formed, and another PET film (first common transparent substrate 1) was laminated to it. On the side of the first common transparent substrate opposite the adhesive layer, a first printed layer (pattern C) and a third printed layer (pattern D) were formed by digital printing. During this process, multiple patterns were printed while continuously changing them. Alignment marks were also used to align the patterns of the second printed layer (pattern A) and the fourth printed layer (pattern B).

[0095] Adhesive was applied to the printed layer side of a polyester (PET) film on which a first printed layer (pattern C) and a third printed layer (pattern D) were formed, and a polyethylene film (common sealant layer 3) was laminated to it. The polyethylene film becomes the innermost layer of the flexible packaging material. This resulted in a laminated sheet for forming a packaging bag.

[0096] The above-mentioned packaging bag forming sheet was processed using a three-side seal bag-making machine to form a bag. The contents were filled into the bag using a filling machine, and one open end was sealed to close it and obtain a package.

[0097] (Example 3) As shown in Figure 5, a polyester (PET) film was prepared as the common transparent substrate 5. A second printed layer (pattern A) and a fourth printed layer (pattern B) were formed on one side of the polyester (PET) film by gravure printing. Alignment marks were also added. The polyester (PET) film becomes the outermost layer of the flexible packaging material. On the printed layer side of the polyester (PET) film with the second printed layer (pattern A) and fourth printed layer (pattern B) formed on it, a first printed layer (pattern C) and a third printed layer (pattern D) were formed by digital printing. During this process, multiple patterns were printed in a continuously changing manner. Alignment marks were also used to align the patterns of the second printed layer (pattern A) and the fourth printed layer (pattern B).

[0098] Adhesive was applied to the surfaces of the first printed layer (pattern C) and the third printed layer (pattern D), and an unoriented polypropylene (CPP) film (common sealant layer 3) was laminated to them. The unoriented polypropylene (CPP) film becomes the innermost layer of the flexible packaging material. This resulted in a laminated sheet for forming a packaging bag.

[0099] The above-mentioned packaging bag forming sheet was processed using a three-side seal bag-making machine to form a bag. The contents were filled into the bag using a filling machine, and one open end was sealed to close it and obtain a package. [Explanation of Symbols]

[0100] 1 … 1st common transparent base material 2…Second common transparent base material 3. Common sealant layer 4. Concealing layer 5 … Transparent base material 11... 1st printing layer 12... 2nd printing layer 10… Laminate (First Embodiment) 20… Laminate (Second Embodiment) 50… Sheet for forming packaging bags 100… Packaging bag

Claims

1. A transparent first transparent sealant layer, A first printing film having a transparent first transparent substrate and a first printing layer disposed on at least one main surface side of the first transparent substrate, The invention comprises, in this order, a second transparent substrate and a second printing film having a second printing layer disposed on at least one main surface side of the second transparent substrate, The first printed layer and the second printed layer are arranged so as to overlap in a plan view. When the second printing film is viewed from the first printing film side, the design shown on the second printing film is configured to be visible through the first printing film. When the first printed film is viewed from the second printed film side, the design shown on the first printed film is configured to be visible through the second printed film. A first laminate comprising at least one of the first and second printing layers being a plateless printing layer, A transparent second transparent sealant layer, A third printing film having a transparent third transparent substrate and a third printing layer disposed on at least one main surface side of the third transparent substrate, The device comprises, in this order, a fourth transparent substrate, and a fourth printing film having a fourth printing layer disposed on at least one main surface side of the fourth transparent substrate, The third and fourth printing layers are arranged to overlap in a plan view. When the fourth printing film is viewed from the third printing film side, the design shown on the fourth printing film is configured to be visible through the third printing film. When the third printing film is viewed from the fourth printing film side, the design shown on the third printing film is configured to be visible through the fourth printing film. A second laminate comprising at least one of the third and fourth printing layers being a plateless printing layer, It has, The first laminate and the second laminate are used by being laminated such that the first transparent sealant layer and the second transparent sealant layer face each other. A laminate set in which, when the first laminate and the second laminate are laminated such that the first transparent sealant layer and the second transparent sealant layer face each other, the design shown on the third printed layer is visible when viewed from the first laminate side.

2. The laminate set according to claim 1, wherein a concealing layer is provided between the third printed layer and the fourth printed layer, and the shielding region on which the shielding layer is provided is arranged such that, when viewed from the third printed layer side in a plan view, a part of the fourth printed layer is shielded, and when viewed from the fourth printed layer side in a plan view, a part of the third printed layer is shielded.

3. It comprises, in this order, a first transparent sealant layer, a first printing layer, a second printing layer, and a first transparent substrate that is transparent. The first printed layer and the second printed layer are arranged so as to overlap in a plan view. The design shown on the second printed layer is visible when the second printed layer is viewed from the first printed layer side. The design shown on the first printed layer is visible when the first printed layer is viewed from the second printed layer side. A third laminate comprising at least one of the first and second printing layers being a plateless printing layer, It comprises, in this order, a transparent second transparent sealant layer, a third printing layer, a fourth printing layer, and a transparent second transparent substrate. The third and fourth printing layers are arranged to overlap in a plan view. The design shown on the fourth printed layer is visible when the fourth printed layer is viewed from the third printed layer side. The design shown on the third printing layer is visible when the third printing layer is viewed from the fourth printing layer side. A fourth laminate comprising at least one of the third and fourth printing layers being a plateless printing layer, It has, The third laminate and the fourth laminate are used by laminating them so that the first transparent sealant layer and the second transparent sealant layer face each other. A laminate set in which, when the third laminate and the fourth laminate are laminated such that the first transparent sealant layer and the second transparent sealant layer face each other, the design shown on the third printed layer is visible when viewed from the third laminate side.

4. The laminate set according to claim 3, wherein a concealing layer is provided between the third printed layer and the fourth printed layer, and the shielding region on which the shielding layer is provided is arranged such that, when viewed from the third printed layer side in a plan view, a part of the fourth printed layer is shielded, and when viewed from the fourth printed layer side in a plan view, a part of the third printed layer is shielded.

5. A sheet for forming a packaging bag, using the laminate set described in claim 1, The first transparent sealant layer and the second transparent sealant layer are the same common sealant layer. The first transparent substrate and the third transparent substrate are the same transparent substrate, and this is the first common transparent substrate. The second transparent substrate and the fourth transparent substrate are the same transparent substrate, and this is the second common transparent substrate. The first printing layer and the third printing layer are arranged adjacent to each other on the first common transparent substrate. The second printing layer and the fourth printing layer are arranged adjacent to each other on the second common transparent substrate. A sheet for forming a packaging bag, wherein the common sealant layer, the first common transparent substrate, and the second common transparent substrate are laminated in this order such that the first and second printed layers, and the third and fourth printed layers, overlap in a plan view.

6. The packaging bag forming sheet according to claim 5, wherein a concealing layer is provided between the third printing layer and the fourth printing layer, and the shielding region on which the shielding layer is provided is arranged such that, when viewed from the third printing layer side in a plan view, a part of the fourth printing layer is shielded, and when viewed from the fourth printing layer side in a plan view, a part of the third printing layer is shielded.

7. A sheet for forming a packaging bag, using the laminate set described in claim 3, The first transparent sealant layer and the second transparent sealant layer are the same common sealant layer. The first transparent substrate and the second transparent substrate are the same transparent substrate, and are a common transparent substrate. The first printing layer and the third printing layer, and the second printing layer and the fourth printing layer are arranged adjacent to each other on the common transparent substrate. A sheet for forming a packaging bag, wherein the common sealant layer and the common transparent substrate are laminated such that the first and second printed layers, and the third and fourth printed layers, overlap in a plan view.

8. The sheet for forming a packaging bag according to claim 7, wherein a concealing layer is provided between the third printing layer and the fourth printing layer, and the shielding region on which the shielding layer is provided is arranged such that, when viewed from the third printing layer side in a plan view, a part of the fourth printing layer is shielded, and when viewed from the fourth printing layer side in a plan view, a part of the third printing layer is shielded.

9. A packaging bag using the laminate set described in claim 1, The first laminate and the second laminate are arranged such that the first transparent sealant layer and the second transparent sealant layer face each other, and the first printed layer, the second printed layer, the third printed layer, and the fourth printed layer overlap in a plan view. A packaging bag in which the first transparent sealant layer and the second transparent sealant layer are heat-sealed in a portion of the periphery of the first laminate and the second laminate.

10. The packaging bag according to claim 9, wherein a concealing layer is provided between the third printing layer and the fourth printing layer, and the shielding region on which the shielding layer is provided is arranged such that, when viewed from the third printing layer side in a plan view, a portion of the fourth printing layer is shielded, and when viewed from the fourth printing layer side in a plan view, a portion of the third printing layer is shielded.

11. A packaging bag using the laminate set described in claim 3, The third laminate and the fourth laminate are arranged such that the first transparent sealant layer and the second transparent sealant layer face each other, and the first printed layer, the second printed layer, the third printed layer, and the fourth printed layer overlap in a plan view. A packaging bag in which the first transparent sealant layer and the second transparent sealant layer are heat-sealed in a portion of the periphery of the third laminate and the fourth laminate.

12. The packaging bag according to claim 11, wherein a concealing layer is provided between the third printing layer and the fourth printing layer, and the shielding region on which the shielding layer is provided is arranged such that, when viewed from the third printing layer side in a plan view, a part of the fourth printing layer is shielded, and when viewed from the fourth printing layer side in a plan view, a part of the third printing layer is shielded.

Images