JP2024047021A - Laminate and packaging bag - Google Patents

Abstract

To provide a laminate and a packaging bag capable of suppressing the mixing of inks even when resin is recycled.SOLUTION: There is provided a laminate 10 in which a water-soluble ink (for example, a water-soluble printing layer 14) is partially coated between a plurality of water-insoluble resin layers.SELECTED DRAWING: Figure 4

Description

The present invention relates to a laminate and a packaging bag.

Patent Document 1 describes a method for producing a printed packaging material in which characters and patterns are printed on one side of a film with ink, a solid print layer is formed on the printed surface with ink, and a sealant layer is provided on the solid print layer via an adhesive layer.

Japanese Patent Application Laid-Open No. 9-314723

In recent years, there has been an issue with regard to the recovery of plastic containers and packaging after use, in that packaging bags containing two or more types of resin are difficult to recycle as plastic containers and packaging. To facilitate recycling, mono-material containers and packaging that use a single resin, such as polyethylene-based resin, have been proposed.

If plastic containers and packaging contain a printed layer, the ink may become contaminated with the recycled resin. This may limit the uses for which the recycled resin can be used, or may result in a deterioration of the physical properties of the recycled resin.

The present invention was made in consideration of the above circumstances, and aims to provide a laminate and a packaging bag that can prevent ink from being mixed in even when the resin is recycled.

The present invention includes the following aspects.
The first aspect is a laminate characterized in that a water-soluble ink is partially coated between a plurality of water-insoluble resin layers.
A second aspect is the first aspect, wherein the plurality of resin layers are one or more selected from a resin film, an adhesive, an extruded resin, and a coating layer.

The third aspect is characterized in that the first or second aspect has a plurality of resin films laminated via an adhesive layer, and a water-soluble printing layer, in which the water-soluble ink is pattern-printed on at least one of the plurality of resin films between the layers of the plurality of resin films.

The fourth aspect is characterized in that, in the third aspect, there is an end bonding area between the water-soluble printing layer and the end of the laminate, in which the multiple resin films are bonded by the adhesive layer without the water-soluble printing layer therebetween.
A fifth aspect is the fourth aspect, characterized in that the water-soluble printed layer is solid printed on the inside of the end bonding region.

The sixth aspect is any one of the first to fifth aspects, characterized in that it has a water-soluble printed layer on the outer surface of the resin film in which the water-soluble ink is pattern-printed, and a coating layer that covers the water-soluble printed layer, and the coating layer has an edge coating region that covers the resin film around the water-soluble printed layer.

A seventh aspect is any one of the first to sixth aspects, characterized in that the resin film included in the plurality of resin layers is made only of a polypropylene-based resin or a polyethylene-based resin.
An eighth aspect is a packaging bag having at least one member formed from the laminate of any one of the first to seventh aspects.

According to the present invention, since the water-soluble ink is part-coated, the laminate can be crushed and then washed with water to dissolve the water-soluble ink, making it possible to suppress ink contamination even when recycling the resin.

1 is a cross-sectional view illustrating a laminate according to a first embodiment. FIG. 3 is a cross-sectional view illustrating a state in which the laminate of the first embodiment is crushed. FIG. 4 is a cross-sectional view illustrating a state in which the laminate of the first embodiment is washed with water after being crushed. FIG. 13 is a plan view illustrating a water-soluble printed layer patterned along the edge of a laminate. 1 is a plan view illustrating a water-soluble printing layer patterned along the shape of a component. FIG. 2 is a cross-sectional view illustrating a state in which a laminate having an internal bonded region has been crushed. FIG. 6 is a cross-sectional view illustrating a laminate according to a second embodiment. FIG. 2 is a front view showing an example of a packaging bag.

The present invention will be described below based on a preferred embodiment.

The laminate of the embodiment is characterized in that the spaces between multiple water-insoluble resin layers are partly coated with a water-soluble ink. Partly coated means that the entire surface of the laminate is not coated, but only part of the laminate is coated. Therefore, the laminate has at least some areas that are not coated with the water-soluble ink.

Because the water-soluble ink is part-coated between multiple resin layers, all or most of the water-soluble ink is covered with the resin layer, suppressing dissolution of the water-soluble ink. In addition, because the water-soluble ink is laminated between the resin layers, by pulverizing the laminate, the water-soluble ink can be easily dissolved compared to dispersing and kneading a water-soluble component in a water-insoluble resin.

The multiple resin layers are not particularly limited, but may be one or more selected from a resin film, an adhesive, an extruded resin, and a coating layer. These resin layers contain a resin that is insoluble or poorly soluble in water. A water-insoluble resin layer may contain a portion of a water-soluble component.

At least one of the resin layers between the layers where the water-soluble ink is placed is preferably made of a resin film, and the water-soluble ink is printed on the resin film used as the printing substrate. The water-soluble ink can also be printed on a printing substrate having an adhesive, coating layer, etc. on its surface. It is also possible to form a film of the water-soluble ink on molten extruded resin using a non-contact method, such as inkjet printing or coating. It is also possible to laminate a resin film having an adhesive, coating layer, etc. on top of the water-soluble ink.

The water-soluble ink is not particularly limited, but may be a composition containing a water-soluble resin, a colorant, etc. dissolved or dispersed in an aqueous solvent. The aqueous solvent is not particularly limited, but may be a solvent mainly composed of water, and may contain organic solvents other than water, acids, alkalis, etc. In addition, various additives may be added to the water-soluble ink as necessary.

Water-soluble resins used in water-soluble inks are not particularly limited, but include polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, polyol compounds, polyacrylic acid, acrylic acid-acrylic acid ester copolymers, hydroxyethyl cellulose, carboxymethyl cellulose, and other polysaccharide derivatives.

Colorants used in water-soluble inks include, but are not limited to, organic pigments, inorganic pigments, carbon pigments, dyes, etc. The water-soluble ink may contain two or more types of colorants. From the standpoint of durability, etc., pigments such as phthalocyanine pigments, quinacridone pigments, metal lake pigments, rhodamine pigments, azo pigments, carbon black, and titanium oxide are preferred.

The laminate of the embodiment is preferably mainly made of a polyolefin resin such as a polyethylene resin or a polypropylene resin. This allows the laminate of the embodiment to be used to realize mono-material container packaging. In this case, the resin film or extruded resin is preferably formed from a polyolefin resin such as a polyethylene resin or a polypropylene resin.

Figure 1 illustrates an example of a laminate 10 of the first embodiment. This laminate 10 has multiple resin films 11, 12 laminated via an adhesive layer 13, and a water-soluble printed layer 14 on which a water-soluble ink is pattern-printed between the multiple resin films 11, 12. The water-soluble printed layer 14 is printed on at least one of the multiple resin films 11, 12.

In the illustrated example, the water-soluble printed layer 14 is printed on the resin film 12 as the printing substrate, but it may be printed on the resin film 11, or on both the resin films 11 and 12. The pattern printing of the water-soluble printed layer 14 is not printed on the entire surface of the resin films 11 and 12, but includes areas on the resin films 11 and 12 where the water-soluble printed layer 14 serves as the printing substrate that are not printed. The printing method of the water-soluble printed layer 14 is not particularly limited, but examples include gravure printing, letterpress printing, offset printing, screen printing, and inkjet printing.

The adhesive layer 13 may be formed from one or more of adhesives, anchor coating agents, extruded resins, etc. An adhesive adhesive layer 13 is used, for example, in dry lamination. An extruded resin adhesive layer 13 is used, for example, in extrusion lamination. The adhesive layer 13 may be formed by laminating two or more layers. For example, an adhesive may be laminated on the resin films 11 and 12, and then an extruded resin may be laminated on top of the adhesive.

Adhesives or anchor coating agents include, but are not limited to, urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, and organic titanium compounds such as titanium alkoxide. The thickness of the adhesive layer 13 using an adhesive or anchor coating agent may be, for example, about 0.1 to 10 μm, about 1 to 6 μm, or about 3 to 4 μm.

When the adhesive layer 13 is formed from an extruded resin, the extruded resin is not particularly limited, but examples thereof include polyolefin resins such as polyethylene resins and polypropylene resins, adhesive resins, etc. Examples of the thickness of the adhesive layer using the extruded resin are about 3 to 30 μm, about 5 to 25 μm, and about 7 to 20 μm. The resin film or the extruded resin in a molten state may be subjected to a surface treatment such as a corona treatment, a plasma treatment, or an ozone treatment.

Between the water-soluble printed layer 14 and the end 10a of the laminate 10, there is an end adhesive region 13a in which the multiple resin films 11, 12 are adhered by the adhesive layer 13 without the water-soluble printed layer 14 in between. As a result, the water-soluble printed layer 14 is not exposed at the end 10a of the laminate 10, but is enclosed inside the laminate 10. Therefore, even if the laminate 10 gets wet when using the laminate 10, the water-soluble printed layer 14 will not come into contact with water and dissolve. The end adhesive region 13a can be formed around the entire circumference or a part of the circumference of the laminate 10.

When recycling the resin of the laminate 10 after using the laminate 10 or its products, the water-soluble printed layer 14 is subjected to a treatment that allows it to come into contact with water. For example, as shown in FIG. 2, by crushing the laminate 10, the water-soluble printed layer 14 is exposed from the cut portion 15 of the crushed laminate 10.

When the crushed laminate 10 is washed with water, the water-soluble printed layer 14 dissolves from the cut portion 15, forming a dissolved portion 16 between the resin films 11, 12 and the adhesive layer 13, as shown in FIG. 3. This allows the water-soluble ink to be easily dissolved from the laminate 10, making it possible to suppress ink contamination even when recycling the resin.

When the fragments 17 and 18 are washed, the fragment 18 including the end adhesive region 13a will have the multiple resin films 11 and 12 still bonded together, but the fragment 18 not including the end adhesive region 13a may have the multiple resin films 11 and 12 physically separated. If the resin films 11 and 12 are monomaterial, they can be recycled in the same way whether they are mixed together or separated.

In the illustrated laminate 10, the water-soluble printed layer 14 is solid printed on the inside of the end adhesive region 13a. In this case, after washing the fragments 17 and 18, the multiple resin films 11 and 12 are easily separated in the fragment 18 that does not include the end adhesive region 13a. For example, if the resin films 11 and 12 have different physical properties such as specific gravity, it is also possible to separate the fragments of one resin film 11 from the other resin film 12.

The resin films 11, 12 included in the laminate 10 are not limited to two layers, but may be three or more layers. When the resin layers are three or more layers, there will be gaps between the resin layers in two or more places, but it is sufficient that the water-soluble printed layer 14 is laminated between at least one of the gaps. In the illustrated example, the gap between the resin film 12 and the adhesive layer 13 is partially coated with water-soluble ink.

Figure 4 is a plan view illustrating a water-soluble printed layer 14 patterned along the edge 10a of the laminate 10. The distance from the water-soluble printed layer 14 to the edge 10a of the laminate 10, i.e., the width of the edge bonding area 13a, is not particularly limited, but may be, for example, about 0.1 mm to 10 mm or about 1 mm to 5 mm. The planar shape of the laminate 10 is not particularly limited, and may be a simple figure such as a circle, ellipse, or polygon, and may also be a desired shape used for various products such as packaging bags.

As shown in FIG. 5, when manufacturing the laminate 10, if a member 21 having a predetermined shape is formed from the laminate 10 that becomes the original roll 20, the water-soluble printed layer 14 may be patterned along the shape of the member 21. Although not specifically shown, multiple patterns of the water-soluble printed layer 14 may be arranged on the same laminate 10 corresponding to multiple members 21.

The shape of member 21 can be formed, for example, by punching, die-cutting, cutting, trimming, etc. When member 21 is formed into a predetermined shape, a laminate 10 similar to that shown in FIG. 4 is obtained in which water-soluble printed layer 14 is patterned along end 10a.

The laminate 10 shown in FIG. 1 has a structure in which a water-soluble printed layer 14 is solid-printed between the layers of the multiple resin films 11, 12 except for the end adhesive region 13a, and the adhesive layer 13 does not directly bond the multiple resin films 11, 12. The laminate 10 of the first embodiment is not limited to the above structure, and may have an internal adhesive region 13b in which the adhesive layer 13 does not contact the end 10a of the laminate 10, as shown in FIG. 6, for example.

In the internal adhesive region 13b, the multiple resin films 11, 12 are bonded together by the adhesive layer 13 without the interposition of the water-soluble printed layer 14. In this case, too, when the crushed product of the laminate 10 is washed with water, the water-soluble printed layer 14 can be eluted from the cut portion 15. By providing the internal adhesive region 13b, it becomes easier to improve the adhesion between the layers of the resin films 11, 12. The width of the internal adhesive region 13b is not particularly limited, but examples include approximately 0.1 mm to 10 mm, or approximately 1 mm to 5 mm.

In addition, in the laminate 10 of the first embodiment, a water-soluble printed layer 14 is printed between the layers of the resin films 11 and 12, but as in the laminate 22 of the second embodiment shown in Figure 7, the water-soluble printed layer 14 may be printed on the outer surface of either of the resin films 11 and 12.

In the illustrated example, a water-soluble ink is pattern-printed on the outer surface 12a of the resin film 12 to form a water-soluble printed layer 14, which is covered with a water-insoluble coating layer 23. In other words, the water-soluble ink is partially coated between the resin film 12 and the coating layer 23.

The coating layer 23 has an end coating region 23a that covers the resin film 12 around the water-soluble printed layer 14. As a result, the water-soluble printed layer 14 is not exposed to the end 22a of the laminate 22, but is enclosed inside the laminate 22. Therefore, even if the laminate 22 becomes wet when using the laminate 22, the water-soluble printed layer 14 will not come into contact with water and dissolve. In addition, the water-soluble printed layer 14 can be dissolved by washing the crushed product of the laminate 22 with water.

The coating layer 23 can be formed by applying a coating agent containing a water-insoluble resin or the like, and then drying, curing, or other processes as necessary to form a film. The coating agent may be a solvent-based agent that contains a solvent, or a solventless agent that does not require drying.

The resins used in the coating agent are not particularly limited, but examples include one or more of urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin (vinyl chloride-vinyl acetate), epoxy resin, polymethylpentene resin, cyclic olefin resin, unsaturated polyester resin, alkyd resin, polyimide resin, polyamideimide resin, polyamide resin, and nitrocellulose (nitrocellulose) resin.

The type of coating agent is not particularly limited, but examples include a one-liquid type in which the composition is supplied in a premixed state, and a two-liquid reaction type in which the base agent and additives are supplied separately and mixed at the time of use. The coating agent may be supplied in a concentrated state, or may be diluted at the time of use to obtain an appropriate concentration or viscosity. The solvent for the coating agent may be selected appropriately taking into consideration the performance when applied. The coating agent may contain a curing agent, a crosslinking agent, etc. that hardens the resin.

The coating agent application device is not particularly limited, but examples include gravure coaters, knife coaters, reverse coaters, bar coaters, spray coaters, spin coaters, die coaters, slit coaters, roll coaters, and dip coaters. The coating layer 23 may be applied in two or more layers or two or more times.

The end coat region 23a can be formed around the entire periphery or a part of the periphery of the laminate 22. The coat layer 23 may also have an internal coat region 23b in which the coat layer 23 does not contact the end 22a of the laminate 22. In the end coat region 23a and the internal coat region 23b, the coat layer 23 is laminated on the resin film 12 without the interposition of the water-soluble printed layer 14. The widths of the end coat region 23a and the internal coat region 23b can be set appropriately in the same manner as the widths of the end adhesive region 13a and the internal adhesive region 13b.

The same laminate may have a water-soluble printed layer 14 protected by a coating layer 23 on the outer surface of the resin film 12, as in laminate 22, as well as a water-soluble printed layer 14 disposed between the layers of the resin films 11 and 12, as in laminate 10.

In the laminates 10 and 22 of the embodiment, the resin films 11 and 12 contained in the multiple resin layers may be configured to consist only of polypropylene-based resin or polyethylene-based resin. Furthermore, when the adhesive layer 13 contains an extruded resin, the extruded resin may be configured to consist only of polypropylene-based resin or polyethylene-based resin.

The proportion of polyethylene resin in the total weight of the polyethylene resin layer or in the entire resin components contained in the laminates 10 and 22 is preferably 80% by weight or more, more preferably 90% by weight or more, and may be 100% by weight. The polyethylene resin layer may contain additives in addition to the resin components.

The proportion of polypropylene resin in the total weight of the polypropylene resin layer or in the entire resin components contained in the laminates 10 and 22 is preferably 80% by weight or more, more preferably 90% by weight or more, and may be 100% by weight. The polypropylene resin layer may contain additives in addition to the resin components.

The polyethylene resin may be a homopolymer of ethylene or a copolymer mainly composed of ethylene. Examples of monomers (comonomers) other than ethylene include one or more of α-olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When the polyethylene resin is copolymerized with a monomer having an ester group such as vinyl acetate, some of the ester groups may be saponified to form a copolymer containing vinyl alcohol.

The proportion of ethylene in the constituent monomers of the polyethylene-based resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. The ethylene or comonomer may be a compound derived from a fossil resource such as petroleum, or may be a compound derived from biomass such as plants. The resin contained in the polyethylene-based resin layer may be only a polyethylene-based resin. At least a portion of the polyethylene-based resin may contain recycled polyethylene-based resin.

The polypropylene resin may be a homopolymer of propylene (homo PP), or a random copolymer (random PP) or block copolymer (block PP) of a propylene-ethylene copolymer or the like. Examples of monomers (comonomers) other than propylene include one or more of α-olefins such as ethylene, 1-butene, 1-hexene, and 1-octene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When a comonomer is used in the polypropylene resin, the comonomer may be one or more of different types.

The proportion of propylene in the constituent monomers of the polypropylene-based resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. Propylene or the comonomer may be a compound derived from a fossil resource such as petroleum, or may be a compound derived from biomass such as plants. The resin contained in the polypropylene-based resin layer may be only a polypropylene-based resin. At least a portion of the polypropylene-based resin may contain recycled polypropylene-based resin.

The resin layer included in the laminate 10, 22 may contain additives other than resin. The additives are not particularly limited, but examples include antioxidants, lubricants, antiblocking agents, flame retardants, UV absorbers, light stabilizers, antistatic agents, colorants, crosslinking agents, etc. The additives may be components that are compatible with the resin, or components that are not compatible with the resin.

When the resin film 11 is the innermost layer, the innermost layer may be formed from a sealant resin. Examples of sealant resins include linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), and polypropylene-based resins. The thickness of the sealant resin layer is not particularly limited, but may be, for example, about 60 to 180 μm. The sealant resin layer may be a single layer, or may have a multi-layer laminate structure formed by coextrusion or the like.

The resin film 12 may be the base film of the laminates 10, 22. Examples of base films include linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene resins, etc. The thickness of the base film is not particularly limited, but may be, for example, about 10 to 50 μm.

The material forming the resin films 11 and 12 may be one type of polyolefin resin or a blend of two or more types of polyolefin resin. The resin films 11 and 12 may be non-stretched resin or stretched resin.

For mono-material container packaging using specific resins, it is preferable that the total of the specific resins is 80% by weight or more and the total of the materials other than the specific resins is 20% by weight or less, and it is more preferable that the total of the specific resins is 90% by weight or more and the total of the materials other than the specific resins is 10% by weight or less, based on the total weight of the laminates 10, 22. This makes it possible to realize a mono-material material of a specific resin. In this case, the specific resin may be a polyethylene-based resin, a polypropylene-based resin, or a polyolefin-based resin.

The laminates 10 and 22 of the embodiment can be used to produce packaging such as packaging bags. At least one component of the packaging may be formed from the laminates 10 and 22, and other components may be, for example, a film that does not have a water-soluble printed layer 14.

The uses of the packaging body are not particularly limited, and may include disposable, refillable, storage, and storage of goods, etc., but it is suitable for use in sealing liquids, and is particularly suitable for use in refilling the contents one or more times with a main container used when consuming the contents. In this case, the main container can be made durable for long-term use, making it easier to package the refillable container. In addition, it becomes easier to recycle the refillable container when disposing of it after the contents have been used up.

Examples of packaging bodies include packaging bags such as pouches and bags, tubes, containers, sleeve packaging, strip packaging, lids, etc. Specific examples of packaging bags include, but are not limited to, three-sided sealed bags, four-sided sealed bags, pillow bags, flat bags, gusset bags, standing pouches, etc. When the laminate is a flexible laminated film, a flexible packaging body can be formed.

Figure 8 shows an example of a packaging bag 30 that becomes a standing pouch. This packaging bag 30 is formed from a pair of body members 31 and a bottom member 32 folded in half along a fold line 33. One body member 31 is arranged at the front and one at the back. The front and back body members 31 may have the same planar shape. The bottom member 32 is folded along the fold line 33 so that the outer surfaces face each other. Above the fold line 33, body seal portions 34 are formed on the left and right, and the inner surfaces of the front and back body members 31 are joined to each other.

The bottom member 32 is sandwiched between the front and rear body members 31 with the fold line 33 on the upper side. Below the fold line 33, a bottom seal portion 35 is formed where the inner surface of the bottom member 32 is joined to the inner surface of the body member 31. The bottom seal portion 35 joins the areas of the bottom member 32 defined by the fold line 33 to the body member 31 on the same side in the front-to-rear direction. The bottom member 32 can be unfolded along the fold line 33 to allow the packaging bag 30 to stand on its own.

When the packaging bag 30 has a body member 31 and a bottom member 32, the laminates 10, 22 of the embodiment may be used for either the body member 31 or the bottom member 32, or for both. By using the laminates 10, 22 having the water-soluble printing layer 14 for the body member 31 or the bottom member 32, images including patterns, characters, etc. can be displayed on the surface of the packaging bag 30. For members that do not require printing, a resin film or the like that does not have the water-soluble printing layer 14 may be used.

The packaging bag 30 may have a filling port, a pouring outlet, etc. For example, the body member 31 may be molded so that the pouring outlet 36 is formed in a shape that protrudes thinly from the top or corner of the packaging bag 30. The packaging bag 30 may be a spout type made of a member molded separately from the laminates 10 and 22.

The packaging bag 30 may be formed only from the laminates 10, 22, or may be combined with accessory parts such as a spout, tube, label, tag, straw, outer box, etc. From the viewpoint of recycling, it is preferable that the accessory parts can be separated from the packaging bag 30. Alternatively, the accessory parts can be formed from the same type of resin as the laminates 10, 22, making the entire bag mono-material.

An opening 37 is formed between the front and rear body members 31 at the top of the packaging bag 30, and can be used for filling or pouring out the contents. After filling the contents, the opening 37 may be joined to seal the packaging bag 30.

The dimensions of the package are not particularly limited, but for example, when used as a refill container, the vertical height is about 100 to 500 mm, the horizontal width is about 70 to 300 mm, and the filling volume is about 100 cm ³ to 5000 cm ^3. The state of the contents may be fluids such as liquids, powders, and granules, or solids such as articles. The type of contents is not particularly limited, but may be detergents, medicines, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, fuels, etc.

The present invention has been described above based on a preferred embodiment, but the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. Modifications include addition, substitution, omission, and other changes to components.

The laminates 10 and 22 of the embodiment are in the form of a laminate film mainly made of polyolefin-based resin, and can be used for a variety of purposes, including not only packaging laminates such as packaging bags and packaging films, but also labels, tags, printed films, etc.

10, 22...Laminate, 10a, 22a...End of laminate, 11, 12...Resin film, 12a...Outer surface of resin film, 13...Adhesive layer, 13a...End adhesive region, 13b...Internal adhesive region, 14...Water-soluble printed layer, 15...Cut portion, 16...Eluted portion, 17, 18...Fragments, 20...Original roll, 21...Component, 23...Coating layer, 23a...End coating region, 23b...Internal coating region, 30...Packaging bag, 31...Body component, 32...Bottom component, 33...Fold line, 34...Body seal portion, 35...Bottom seal portion, 36...Pouring outlet, 37...Opening.

Claims (8)

A laminate characterized in that a water-soluble ink is partially coated between multiple water-insoluble resin layers. The laminate according to claim 1, characterized in that the multiple resin layers are one or more selected from a resin film, an adhesive, an extruded resin, and a coating layer. A plurality of resin films laminated via adhesive layers;
a water-soluble printed layer formed by printing a pattern of the water-soluble ink on at least one of the plurality of resin films between the plurality of resin film layers;
The laminate according to claim 1 , characterized in that it has The laminate according to claim 3, characterized in that it has an end adhesive region between the water-soluble printed layer and the end of the laminate, in which the multiple resin films are adhered to each other by the adhesive layer without the water-soluble printed layer interposed therebetween. The laminate according to claim 4, characterized in that the water-soluble printed layer is solid printed inside the end adhesive region. a water-soluble printing layer formed by printing a pattern of the water-soluble ink on an outer surface of a resin film;
A coating layer covering the water-soluble printing layer,
2. The laminate according to claim 1, wherein the coating layer has an edge coating region that covers the resin film around the water-soluble printed layer. The laminate according to claim 1, characterized in that the resin film contained in the multiple resin layers is made only of polypropylene-based resin or polyethylene-based resin. A packaging bag in which at least one member is formed from the laminate described in any one of claims 1 to 7.

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