Laminates and packaging bags

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

Technical Field

[0001] The present invention relates to a laminate and a packaging bag.

Background Art

[0002] Patent Document 1 describes a method for manufacturing a printed packaging material, in which a film is printed with ink on one side to apply characters or patterns, a solid printing layer is formed with ink on the printed surface, and a sealant layer is provided via an adhesive layer on the solid printing layer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=3****]]In recent years, regarding the recycling of plastic container packaging after use, there is a problem that a packaging bag containing two or more types of resins is difficult to recycle as plastic container packaging. In order to facilitate recycling, a monomaterial container packaging using a single resin such as a polyethylene-based resin has been proposed.

[0005] If a printed layer is included in plastic container packaging, ink may be mixed into the recycled resin. In this case, the available uses of the recycled resin may be restricted or the physical properties of the recycled resin may deteriorate.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a laminate and a packaging bag capable of suppressing the mixing of ink even when the resin is recycled.

Means for Solving the Problems

[0007] The present invention includes the following aspects. The first embodiment is a laminate characterized in that a water-soluble ink is partially coated between multiple water-insoluble resin layers. A second embodiment is characterized in that, in the first embodiment, the plurality of resin layers are one or more selected from resin films, adhesives, extruded resins, and coating layers.

[0008] A third embodiment is characterized in that, in the first or second embodiment, it comprises a plurality of resin films laminated via an adhesive layer, and a water-soluble printing layer between the layers of the plurality of resin films, on which the water-soluble ink is pattern-printed on at least one of the plurality of resin films.

[0009] A fourth aspect is characterized in that, in the third aspect, there is an edge bonding region between the water-soluble printing layer and the edge of the laminate in which the plurality of resin films are bonded together by the adhesive layer without the water-soluble printing layer interposing between them. A fifth aspect is characterized in that, in the fourth aspect, the water-soluble printing layer is solid printed on the inside of the end bonding region.

[0010] The sixth embodiment is characterized in that, in any one of the first to fifth embodiments, the resin film has a water-soluble printing layer on which the water-soluble ink is pattern-printed on the outer surface of the resin film, and a coating layer covering the water-soluble printing layer, wherein the coating layer has an edge coating region that covers the resin film around the water-soluble printing layer.

[0011] The seventh embodiment is characterized in that, in any one of the first to sixth embodiments, the resin film contained in the plurality of resin layers consists only of polypropylene resin or polyethylene resin. The eighth embodiment is a packaging bag in which at least one component is formed from a laminate of any one of the first to seven embodiments. [Effects of the Invention]

[0012] According to the present invention, since the water-soluble ink is part-coated, by pulverizing the laminate and then washing it with water, the water-soluble ink can be eluted, and even when the resin is recycled, it is possible to suppress the mixing of the ink.

Brief Description of the Drawings

[0013] [Figure 1] It is a cross-sectional view illustrating the laminate of the first embodiment. [Figure 2] It is a cross-sectional view illustrating the pulverized state of the laminate of the first embodiment. [Figure 3] It is a cross-sectional view illustrating the state of the laminate of the first embodiment after being pulverized and then washed with water. [Figure 4] It is a plan view illustrating a water-soluble printing layer patterned along the edge of the laminate. [Figure 5] It is a plan view illustrating a water-soluble printing layer patterned along the shape of the member. [Figure 6] It is a cross-sectional view illustrating the pulverized state of the laminate having an internal adhesion region. [Figure 7] It is a cross-sectional view illustrating the laminate of the second embodiment. [Figure 8] It is a front view showing an example of a packaging bag.

Modes for Carrying Out the Invention

[0014] Hereinafter, the present invention will be described based on preferred embodiments.

[0015] The laminate of the embodiment is a laminate characterized in that a water-soluble ink is part-coated between a plurality of non-water-soluble resin layers. Part-coating means that it is not coated on the entire surface of the laminate, but is coated on a part of the laminate. Therefore, the laminate has a region where the water-soluble ink is not coated in at least a part of the region.

[0016] Since the water-soluble ink is part-coated between the plurality of resin layers, all or most of the periphery of the water-soluble ink is covered with the resin layer, suppressing the elution of the water-soluble ink. Also, since the water-soluble ink is laminated between the resin layers, when the laminate is pulverized, the water-soluble ink can be easily eluted as compared with the case of dispersing and kneading the water-soluble component in the water-insoluble resin.

[0017] The plurality of resin layers are not particularly limited, and examples include one or more selected from resin films, adhesives, extruded resins, and coat layers. These resin layers contain resins that are insoluble or hardly soluble in water. The water-insoluble resin layer may contain a water-soluble component in part.

[0018] Regarding the interlayer where the water-soluble ink is disposed, it is preferable that at least one of the resin layers is made of a resin film and the water-soluble ink is printed on the resin film as a printing substrate. It is also possible to print the water-soluble ink on a printing substrate having an adhesive, a coat layer, etc. on its surface. It is also possible to form a film of the water-soluble ink by inkjet, coating, etc. in a non-contact manner on the molten extruded resin. It is also possible to laminate a resin film having an adhesive, a coat layer, etc. on the printed water-soluble ink.

[0019] The water-soluble ink is not particularly limited, and examples include compositions containing a water-soluble resin, a colorant, etc. dissolved or dispersed in an aqueous solvent. The aqueous solvent is not particularly limited, and may be a solvent mainly composed of water, and organic solvents, acids, alkalis, etc. other than water may be added. Also, various additives may be added to the water-soluble ink as necessary.

[0020] The water-soluble resin used for the water-soluble ink is not particularly limited, and examples include polysaccharide derivatives such as polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide, polyol compounds, polyacrylic acid, acrylic acid-acrylic acid ester copolymer, hydroxyethyl cellulose, and carboxymethyl cellulose.

[0021] The colorants used in water-soluble inks are not particularly limited, but include organic pigments, inorganic pigments, carbon pigments, dyes, etc. Water-soluble inks may contain two or more colorants. From the viewpoint of durability, pigments such as phthalocyanine pigments, quinacridone pigments, metal lake pigments, rhodamine pigments, azo pigments, carbon black, and titanium dioxide are preferred.

[0022] The laminate of the embodiment is preferably mainly composed of polyolefin resins such as polyethylene resins and polypropylene resins. This makes it possible to realize monomaterial container packaging using the laminate of the embodiment. In this case, the resin film or extruded resin is preferably formed from polyolefin resins such as polyethylene resins and polypropylene resins.

[0023] Figure 1 illustrates a laminate 10 of the first embodiment. This laminate 10 comprises a plurality of resin films 11, 12 laminated via an adhesive layer 13, and a water-soluble printing layer 14 in which water-soluble ink is pattern-printed between the layers of the plurality of resin films 11, 12. The water-soluble printing layer 14 is printed on at least one of the plurality of resin films 11, 12.

[0024] In the illustrated example, the water-soluble printing layer 14 is printed on the resin film 12 as the printing substrate, but it may also be printed on the resin film 11, or on both the resin films 11 and 12. The pattern printing of the water-soluble printing layer 14 does not cover the entire surface of the resin films 11 and 12, but includes areas on the resin films 11 and 12 that serve as the printing substrate where the water-soluble printing layer 14 is printed that are not printed. The printing method for the water-soluble printing layer 14 is not particularly limited, but examples include gravure printing, letterpress printing, offset printing, screen printing, and inkjet printing.

[0025] The adhesive layer 13 may be formed from one or more of the following: an adhesive, an anchor coating agent, an extruded resin, etc. An adhesive layer 13 made of an adhesive is used, for example, in dry lamination. An adhesive layer 13 made of an extruded resin is used, for example, in extruded lamination. Two or more layers of the adhesive layer 13 may be laminated. For example, an adhesive may be laminated on resin films 11 and 12, and then an extruded resin may be laminated on top of that.

[0026] The adhesive or anchor coating agent is not particularly limited, but examples include urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, and organotitanium compounds such as titanium alkoxide. The thickness of the adhesive layer 13 using the adhesive or anchor coating agent can be, for example, about 0.1 to 10 μm, about 1 to 6 μm, or about 3 to 4 μm.

[0027] When the adhesive layer 13 is formed from an extruded resin, the extruded resin is not particularly limited, but examples include polyethylene resins, polyolefin resins such as polypropylene resins, and adhesive resins. The thickness of the adhesive layer using the extruded resin can be approximately 3 to 30 μm, 5 to 25 μm, or 7 to 20 μm. Surface treatments such as corona treatment, plasma treatment, or ozone treatment may be applied to the resin film or the molten extruded resin.

[0028] Between the water-soluble printing layer 14 and the end 10a of the laminate 10, there is an end adhesive region 13a where multiple resin films 11, 12 are bonded together by an adhesive layer 13 without the water-soluble printing layer 14 interposing between them. As a result, the water-soluble printing layer 14 is not exposed to the end 10a of the laminate 10 and is sealed inside the laminate 10. Therefore, when using the laminate 10, even if the laminate 10 gets wet with water, the water-soluble printing layer 14 will not come into contact with the water and dissolve. The end adhesive region 13a can be formed around the entire circumference or a part of the perimeter of the laminate 10.

[0029] If the resin of the laminate 10 is recycled after using the laminate 10 or its products, the water-soluble printing layer 14 is subjected to a treatment that allows it to come into contact with water. For example, as shown in Figure 2, by crushing the laminate 10, the water-soluble printing layer 14 is exposed from the cut portion 15 of the crushed laminate 10.

[0030] When the crushed laminate 10 is washed with water, the water-soluble printing layer 14 dissolves from the cut portion 15, and as shown in Figure 3, an elution portion 16 is formed between the resin films 11, 12 and the adhesive layer 13. This makes it easy to dissolve the water-soluble ink from the laminate 10, and makes it possible to suppress ink contamination even when recycling the resin.

[0031] When fragments 17 and 18 are washed, fragment 18 containing the end-bonding region 13a remains bonded between the multiple resin films 11 and 12, while fragment 18 without the end-bonding region 13a may have its multiple resin films 11 and 12 physically separated. If the resin films 11 and 12 are monomaterial, they can be recycled equally whether they are mixed or separated.

[0032] In the laminate 10 shown in the illustration, a water-soluble printing layer 14 is solid-printed inside the end-adhesive region 13a. In this case, after washing the fragments 17 and 18, the multiple resin films 11 and 12 can be 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 differences in physical properties such as specific gravity, it becomes possible to separate fragments of one resin film 11 from the other resin film 12.

[0033] The resin films 11 and 12 contained in the laminate 10 are not limited to two layers, but may be three or more layers. If there are three or more resin layers, there will be two or more gaps between the resin layers, but it is sufficient that the water-soluble printing layer 14 is laminated between at least one of these gaps. In the illustrated example, water-soluble ink is partially coated between the resin film 12 and the adhesive layer 13.

[0034] 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 adhesive region 13a, is not particularly limited, but for example, it could be 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 shape such as a circle, ellipse, or polygon, and it can also be made into a desired shape used for various products such as packaging bags.

[0035] As shown in Figure 5, when the laminate 10 is manufactured into a product, if a member 21 having a predetermined shape is formed from the laminate 10 which becomes the raw material 20, the water-soluble printed layer 14 may be patterned along the shape of the member 21. Although not specifically shown, multiple patterns of water-soluble printed layers 14 corresponding to multiple members 21 may be arranged on the same laminate 10.

[0036] 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 similar to the laminate 10 with a water-soluble printed layer 14 patterned along the end 10a can be obtained, as shown in Figure 4.

[0037] The laminate 10 shown in Figure 1 has a structure in which, except for the end bonding region 13a, a water-soluble printing layer 14 is solidly printed between the layers of multiple resin films 11 and 12, and the adhesive layer 13 does not directly bond the multiple resin films 11 and 12 to each other. The laminate 10 of the first embodiment is not limited to the structure described above, and may have an internal bonding region 13b in which the adhesive layer 13 does not come into contact with the end 10a of the laminate 10, for example, as shown in Figure 6.

[0038] In the internal bonding region 13b, the multiple resin films 11 and 12 are bonded together by the adhesive layer 13 without the intervening water-soluble printing layer 14. In this case as well, when the crushed laminate 10 is washed with water, the water-soluble printing layer 14 can be leached out from the cut portion 15. By providing the internal bonding region 13b, the bonding between the layers of the resin films 11 and 12 is made easier to improve. The width of the internal bonding region 13b is not particularly limited, but examples include approximately 0.1 mm to 10 mm or approximately 1 mm to 5 mm.

[0039] Furthermore, while the laminate 10 of the first embodiment has a water-soluble printing layer 14 printed between the layers of resin films 11 and 12, the water-soluble printing layer 14 may be printed on the outer surface of either the resin films 11 or 12, as shown in the laminate 22 of the second embodiment in Figure 7.

[0040] In the illustrated example, a water-soluble ink is pattern-printed onto the outer surface 12a of the resin film 12 to form a water-soluble printed layer 14, which is then covered with a non-water-soluble coating layer 23. In other words, the water-soluble ink is partially coated between the resin film 12 and the coating layer 23.

[0041] The coating layer 23 has an edge coating region 23a that covers the resin film 12 around the water-soluble printing layer 14. As a result, the water-soluble printing layer 14 is not exposed at the edges 22a of the laminate 22, but is sealed inside the laminate 22. Therefore, when using the laminate 22, even if the laminate 22 gets wet with water, the water-soluble printing layer 14 will not come into contact with the water and dissolve. Furthermore, the water-soluble printing layer 14 can be dissolved by washing the crushed laminate 22 with water.

[0042] 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 performing other treatments as necessary to form a film. The coating agent may be a solvent-type containing a solvent, or a solvent-free type that does not require drying.

[0043] The resin used in the coating agent is not particularly limited, but examples include one or more of the following: urethane resin, acrylic resin, vinyl chloride-vinyl acetate copolymer resin, epoxy resin, polymethylpentene resin, cyclic olefin resin, unsaturated polyester resin, alkyd resin, polyimide resin, polyamide-imide resin, polyamide resin, nitrocellulose (nitrate cotton) resin, etc.

[0044] The type of coating agent is not particularly limited, but examples include a one-component type in which the composition is supplied in a pre-mixed state, and a two-component reaction type in which the main component and additives are supplied separately and mixed at the time of use. The coating agent may be supplied in a concentrated state, or it may be diluted at the time of use to obtain an appropriate concentration or viscosity. The solvent of the coating agent can be appropriately selected considering the performance when applied. The coating agent may contain a curing agent, crosslinking agent, etc., for curing the resin.

[0045] The coating 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 in two or more overlapping applications.

[0046] The edge coating region 23a can be formed around the entire circumference or a portion of the periphery of the laminate 22. The laminate may also have an internal coating region 23b where the coating layer 23 does not contact the edge 22a of the laminate 22. In the edge coating region 23a and the internal coating region 23b, the coating layer 23 is laminated on the resin film 12 without an intervening water-soluble printing layer 14. The widths of the edge coating region 23a and the internal coating region 23b can be set appropriately, similar to the widths of the edge bonding region 13a and the internal bonding region 13b.

[0047] The same laminate may have, in addition to the water-soluble printing layer 14 protected by the coating layer 23 on the outer surface of the resin film 12, similar to laminate 22, a water-soluble printing layer 14 disposed between the layers of resin films 11 and 12, similar to laminate 10.

[0048] In the laminates 10 and 22 of the embodiment, the resin films 11 and 12 included in the plurality of resin layers may consist only of polypropylene resin or polyethylene resin. Furthermore, if the adhesive layer 13 includes an extruded resin, the extruded resin may consist only of polypropylene resin or polyethylene resin.

[0049] The total weight of the polyethylene resin layer in the laminates 10 and 22, or the proportion of polyethylene resin in the total resin components, 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 other than the resin components.

[0050] The total weight of the polypropylene resin layer in the laminates 10 and 22, or the proportion of polypropylene resin in the total resin components, 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 other than the resin components.

[0051] Polyethylene resins may be homopolymers of ethylene or copolymers mainly composed of ethylene. Examples of monomers other than ethylene (comonomers) include one or more 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 polyethylene resins are copolymerized with monomers having ester groups such as vinyl acetate, some of the ester groups may be saponified, resulting in a copolymer containing vinyl alcohol.

[0052] The proportion of ethylene in the constituent monomers of the polyethylene 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 fossil resources such as petroleum, or a compound derived from biomass such as plants. The resin contained in the polyethylene resin layer may consist solely of polyethylene resin. At least a portion of the polyethylene resin may also contain recycled polyethylene resin.

[0053] The polypropylene resin mentioned above may be a homopolymer of propylene (homoPP), or a random copolymer (randomPP) or block copolymer (blockPP) of propylene-ethylene copolymer, etc. Examples of monomers other than propylene (comonomers) include one or more 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 comonomers are used in the polypropylene resin, there may be one or more comonomers.

[0054] The proportion of propylene in the constituent monomers of the polypropylene resin is preferably 50% by weight or more, and may be, for example, 80 to 100% by weight. The propylene or comonomer may be a compound derived from fossil resources such as petroleum, or a compound derived from biomass such as plants. The resin contained in the polypropylene resin layer may consist only of polypropylene resin. At least a portion of the polypropylene resin may also contain recycled polypropylene resin.

[0055] The resin layers contained in the laminates 10 and 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, and crosslinking agents. The additives may be components compatible with the resin or components incompatible with the resin.

[0056] If 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 resins. The thickness of the sealant resin layer is not particularly limited, but for example, it can be about 60 to 180 μm. The sealant resin layer may be a single layer or may have a multilayer laminated structure formed by co-extrusion or the like.

[0057] 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), and polypropylene resins. The thickness of the base film is not particularly limited, but examples include about 10 to 50 μm.

[0058] The material used to form the resin films 11 and 12 may be a single polyolefin resin or a blend of two or more polyolefin resins. The resin films 11 and 12 may be made of unstretched resin or stretched resin.

[0059] For monomaterial containers and packaging made of a specific resin, it is preferable that the total weight of the specific resin is 80% or more by weight of the total weight of the laminates 10,22, and the total weight of materials other than the specific resin is 20% or less by weight, and more preferably that the total weight of the specific resin is 90% or more by weight and the total weight of materials other than the specific resin is 10% or less by weight. This makes it possible to realize a monomaterial material of the specific resin. In this case, the specific resin may be a polyethylene resin, a polypropylene resin, or a polyolefin resin.

[0060] The laminates 10 and 22 of this embodiment can be used to manufacture packaging such as packaging bags. It is sufficient that at least one component of the packaging is formed from the laminates 10 and 22, and the other components may be films that do not have, for example, a water-soluble printing layer 14.

[0061] The use of the packaging is not particularly limited, including disposable, refillable, storage, and for storing goods, but it is suitable for sealing liquids and is especially suitable for refilling the main container with contents once or multiple times. In this case, the main container can be made durable for long-term use, and the packaging of the refill container can be simplified. In addition, recycling becomes easier when disposing of the refill container after the contents have been used up.

[0062] Examples of packaging materials include pouches, bags, tubes, containers, sleeve packaging, strip packaging, and lids. Specific examples of packaging bags are not limited to three-side sealed bags, four-side sealed bags, pillow bags, flat bags, gusset bags, and standing pouches. When the laminate is a flexible laminated film, a flexible packaging material can be formed.

[0063] Figure 8 shows an example of a packaging bag 30 that forms a standing pouch. This packaging bag 30 is made up of a pair of body members 31 and a bottom member 32 that is folded in half along a fold line 33. One body member 31 is placed at the front and one at the back. The planar shapes of the front and rear body members 31 may be the same. The bottom member 32 is folded along the fold line 33 so that its outer surfaces face each other. Above the fold line 33, body seal portions 34 are formed on the left and right sides, and the inner surfaces of the front and rear body members 31 are joined together.

[0064] The bottom member 32 is sandwiched between the front and rear body members 31 with the fold line 33 facing upwards. 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 area of ​​the bottom member 32 demarcated by the fold line 33 to the body member 31 on the same side in the front-to-back direction. By spreading the bottom member 32 relative to the fold line 33, the packaging bag 30 can stand on its own.

[0065] If the packaging bag 30 has a body member 31 and a bottom member 32, the laminates 10 and 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 and 22 having a water-soluble printing layer 14 for the body member 31 or the bottom member 32, an image including a design, text, 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 without a water-soluble printing layer 14 may be used.

[0066] The packaging bag 30 may have a filling opening, a spout, etc. For example, the spout 36 may be formed by molding the body member 31 so that it protrudes thinly from the top or corner of the packaging bag 30. The packaging bag 30 may also be a spout type made of a member molded separately from the laminates 10 and 22.

[0067] The packaging bag 30 may be formed solely from the laminates 10 and 22, or it may be combined with auxiliary components such as a spout, tube, label, tag, straw, and outer box. From a recycling standpoint, it is preferable that the auxiliary components can be separated from the packaging bag 30. Alternatively, the auxiliary components can be formed from the same type of resin as the laminates 10 and 22, making the entire structure a monomaterial.

[0068] An opening 37 is formed at the top of the packaging bag 30 between the front and rear body members 31, which can be used for filling or dispensing the contents. After filling the contents, the opening 37 may be joined to seal the packaging bag 30.

[0069] The dimensions of the packaging are not particularly limited, but for example, for refillable containers, the height is approximately 100-500 mm, the width is approximately 70-300 mm, and the filling volume is approximately 100 cm³. 3 ~5000cm 3 The degree can be mentioned. The state of the contents can be fluids such as liquids, powders, or granules, or solids such as articles. The type of contents is not particularly limited, but can be detergents, chemicals, cosmetics, pharmaceuticals, beverages, seasonings, inks, paints, fuels, etc.

[0070] Although the present invention has been described above based on preferred embodiments, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. Modifications include the addition, substitution, omission, and other changes to the components.

[0071] The laminates 10 and 22 of the embodiment are laminated films mainly composed of polyolefin resin, and are not limited to packaging laminates such as packaging bags and packaging films, but can be used for various applications such as labels, tags, and printed films. [Explanation of Symbols]

[0072] 10,22...Laminate, 10a,22a...End of laminate, 11,12...Resin film, 12a...Outer surface of resin film, 13...Adhesive layer, 13a...End adhesive area, 13b...Internal adhesive area, 14...Water-soluble printing layer, 15...Cut section, 16...Dissolving section, 17,18...Fragments, 20...Raw material, 21...Component, 23...Coating layer, 23a...End coating area, 23b...Internal coating area, 30...Packaging bag, 31...Body component, 32...Bottom component, 33...Fold line, 34...Body seal section, 35...Bottom seal section, 36...Pouring spout, 37...Opening.

Claims

1. A laminate in which a water-soluble ink is partially coated between multiple water-insoluble resin layers, The aforementioned plurality of resin layers are one or more selected from resin films, adhesives, extruded resins, and coating layers. The laminate comprises a plurality of resin films laminated via an adhesive layer, and a water-soluble printing layer between the layers of the plurality of resin films, on which the water-soluble ink is pattern-printed on at least one of the plurality of resin films. Between the water-soluble printing layer and the end of the laminate, there is an end bonding region where the plurality of resin films are bonded together by the adhesive layer without the water-soluble printing layer interposed between them. The laminate is characterized in that the water-soluble printing layer is solid-printed inside the end-bonding region.

2. A water-soluble printed layer on the outer surface of a resin film, in which the water-soluble ink is pattern-printed, The water-soluble printing layer has a coating layer covering it, The laminate according to claim 1, characterized in that the coating layer has an edge coating region that covers the resin film around the water-soluble printing layer.

3. The laminate according to claim 1, characterized in that the resin film contained in the plurality of resin layers consists only of polypropylene resin or polyethylene resin.

4. A packaging bag in which at least one component is formed from a laminate according to any one of claims 1 to 3.

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