Packaging containers

Abstract

A first aspect of the present invention provides a method for manufacturing a packaging container, the method comprising: a step for applying an anchor composition containing a first resin component onto a printing base material and curing the anchor composition to form an anchor layer; a step for inkjet-printing an aqueous ink composition on the anchor layer to form an aqueous ink layer; a step for directly or indirectly applying a coat composition, which contains a second resin component and a curing component for curing the first resin component, onto the aqueous ink layer, curing the coat composition to form a coat layer, and thereby forming a print part including the printing base material, the anchor layer, the aqueous ink layer, and the coat layer; and a step for providing the print part on one surface of a packaging support part.

Description

[Technical Field]

[0001] This invention relates to a packaging container. [Background technology]

[0002] It is known that inkjet printing can be performed on packaging containers such as pouches and cans using ink compositions. For example, Patent Document 1 describes an inkjet printing method for beverage cans using an ultraviolet-curable ink composition. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2019-108138

[0004] A method for manufacturing a packaging container may include the steps of: forming an anchor layer on a printing substrate; forming an aqueous ink layer on the anchor layer; forming a coating layer on the aqueous ink layer to form a printed portion including the printing substrate, anchor layer, aqueous ink layer, and coating layer; and providing the printed portion on one surface of a packaging support portion.

[0005] The step of forming an anchor layer on a printing substrate may be a step of applying an anchor composition containing a first resin component to the printing substrate and curing it. The step of forming an aqueous ink layer on the anchor layer may be a step of inkjet printing the aqueous ink composition onto the anchor layer. The step of forming a coating layer on the aqueous ink layer to form a printed portion including the printing substrate, anchor layer, aqueous ink layer, and coating layer may be a step of applying a coating composition containing a second resin component and a curing component that cures the first resin component directly or indirectly to the aqueous ink layer and curing it to form a coating layer.

[0006] In the step of providing the printed portion on one surface of the packaging support portion, the surface of the printed portion opposite to the printing substrate may be adhered to the surface of the packaging support portion.

[0007] The step of forming the printed area may be a step of forming a base ink layer on an aqueous ink layer to form a printed area including a printing substrate, an anchor layer, an aqueous ink layer, a coating layer, and a base ink layer. Alternatively, the step of forming the printed area may be a step of forming a base ink layer on a coating layer to form a printed area including a printing substrate, an anchor layer, an aqueous ink layer, a coating layer, and a base ink layer.

[0008] In the step of providing the printed portion on one surface of the packaging support portion, the printed substrate side of the printed portion may be adhered to the surface of the packaging support portion.

[0009] The process may further include a step of forming a base ink layer on the printing substrate before the step of forming the anchor layer. In this case, the step of forming the anchor layer may be a step of forming the anchor layer on at least one of the printing substrate and the base ink layer. The printed portion may include a printing substrate, a base ink layer, an anchor layer, an aqueous ink layer, and a coating layer.

[0010] The step of forming the printed area may be the step of forming a base ink layer on the anchor layer to form a printed area including a printing substrate, an anchor layer, a base ink layer, an aqueous ink layer, and a coating layer.

[0011] The first resin component may include a polyurethane resin, and the curing component may include an isocyanate resin. The first resin component may include an epoxy resin, and the curing component may include an amino resin or an isocyanate resin. The first resin component may include an acrylic resin, and the curing component may include an acrylic resin having oxazoline or isocyanate. The first resin component may include a polyester resin, and the curing component may include an isocyanate resin.

[0012] A method for manufacturing a packaging container may include the steps of laminating a printing substrate and a packaging support to form a laminate, and forming an aqueous ink layer on the printing substrate of the laminate, thereby forming a printed portion including the printing substrate and the aqueous ink layer.

[0013] The step of forming the aqueous ink layer may be the step of inkjet printing the aqueous ink composition onto the printing substrate of the laminate.

[0014] Prior to the step of forming the laminate, the procedure may further include a step of forming a base ink layer on the side of the printing substrate opposite to the side on which the aqueous ink layer is formed.

[0015] The process may further include a step of forming an anchor layer on the printing substrate of the laminate before the step of forming the aqueous ink layer. In this case, the step of forming the aqueous ink layer may be a step of inkjet printing an aqueous ink composition onto the anchor layer to form the aqueous ink layer. The step of forming the printed area may be a step of applying a coating composition containing a second resin component and a curing component that cures the first resin component directly or indirectly to the aqueous ink layer, curing it to form a coating layer, thereby forming a printed area including the printing substrate, anchor layer, aqueous ink layer and coating layer.

[0016] The first resin component may include a polyurethane resin, and the curing component may include an isocyanate resin. The first resin component may include an epoxy resin, and the curing component may include an amino resin or an isocyanate resin. The first resin component may include an acrylic resin, and the curing component may include an acrylic resin having oxazoline or isocyanate. The first resin component may include a polyester resin, and the curing component may include an isocyanate resin.

[0017] Before the step of forming the anchor layer, a step of forming a base ink layer on the printed substrate of the laminate may be further provided. At this time, the step of forming the anchor layer may be a step of forming the anchor layer on at least one of the printed substrate and the base ink layer. The printing part may include a printed substrate, a base ink layer, an anchor layer, an aqueous ink layer, and a coat layer.

[0018] The step of forming the printing part may be a step of forming a base ink layer on the anchor layer to form a printing part including a printed substrate, an anchor layer, a base ink layer, an aqueous ink layer, and a coat layer.

[0019] Before performing the step of forming the anchor layer on the printed substrate, a step of subjecting the printed substrate to corona treatment may be further included. Also, before performing the step of forming the base ink layer on the printed substrate, a step of subjecting the printed substrate to corona treatment may be further included. Before performing the step of forming the aqueous ink layer on the printed substrate, a step of subjecting the printed substrate to corona treatment may be further included.

[0020] The base ink layer may be a layer containing pigment ink.

[0021] The laminate may be a web for a pouch.

[0022] The packaging support part may be a single-layer film or a laminated film. The packaging container may be a pouch.

[0023] The packaging support part may be a laminated film. The packaging container may be a retort pouch.

[0024] The packaging support part may be a laminated film. At least one of the laminated films may include a metal foil.

[0025] The packaging support part may be a can body. The packaging container may be a can container.

[0026] The surface free energy of the aqueous ink layer calculated by the Kaelble-Uy method is 30 mJ / m at a temperature of 25°C ,

[0033] , , ,

[0031] ,

[0035] , , , , ,

[0032] , , ,

[0034] or more and 70 mJ / m 2 or less.

[0027] The packaging container may include a packaging support portion and a printing portion provided on one surface of the packaging support portion.

[0028] The printing portion may include a printing substrate, an anchor layer provided on the printing substrate, an aqueous ink layer applied to the anchor layer, and a coat layer for protecting the aqueous ink layer. The anchor layer may be formed by curing a first resin component. The coat layer may be formed by curing a second resin component and may contain a curing component for curing at least the first resin component.

[0029] In the packaging container, the surface opposite to the printing substrate side of the printing portion may be provided on one surface of the packaging support portion.

[0030] The printing portion may further include an undercoat ink layer provided on the aqueous ink layer. Also, the printing portion may further include an undercoat ink layer provided on the coat layer.

[0031] In the packaging container, the printing substrate side of the printing portion may be provided on one surface of the packaging support portion.

[0032] The printing portion may further include an undercoat ink layer provided on the printing substrate.

[0033] The printing portion may further include an undercoat ink layer provided on the anchor layer.

[0034] The packaging container may further have an undercoat ink layer on the surface opposite to the surface on which the aqueous ink layer of the printing substrate is provided.

[0035] The first resin component may include a polyurethane resin, and the curing component may include an isocyanate resin. The first resin component may include an epoxy resin, and the curing component may include an amino resin or an isocyanate resin. The first resin component may include an acrylic resin, and the curing component may include an acrylic resin having oxazoline or isocyanate. The first resin component may include a polyester resin, and the curing component may include an isocyanate resin.

[0036] The hardening component may be one that further hardens the water-based ink layer.

[0037] The packaging container may include a packaging support section and a printing section provided on one side of the packaging support section.

[0038] The printing section may include a printing substrate and an aqueous ink layer applied to the printing substrate. The printing section may be provided on one side of the packaging support section, with the printing substrate side facing it. The printing section may further have a base ink layer on the side of the printing substrate opposite to the side where the aqueous ink layer is provided.

[0039] The base ink layer may be a layer containing pigment ink.

[0040] The packaging support may be a single layer of film or a laminate of films. The packaging container may be a pouch.

[0041] The packaging support section may be made of laminated film. The packaging container may be a retort pouch.

[0042] The packaging support portion may be made of laminated films. At least one of the laminated films may contain metal foil.

[0043] The packaging support part may be a can. The packaging container may be a can container.

[0044] The surface free energy of the aqueous ink layer, calculated by the Kaelble-Uy method, is 30 mJ / m² at a temperature of 25°C. 2More than 70mJ / m 2 The following is acceptable:

[0045] It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. Furthermore, subcombinations of these features may also constitute an invention. [Brief explanation of the drawing]

[0046] [Figure 1] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 2] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 3] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 4] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 5] An example of lamination of the base ink layer in this embodiment is shown. [Figure 6] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 7] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 8] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 9] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 10] An example of the overall layer structure of the packaging container in this embodiment is shown. [Figure 11] An example of the manufacturing flow of the packaging container of this embodiment is shown. [Figure 12] This example shows a flow for forming a base ink layer on a printing substrate in this embodiment. [Figure 13] This example shows a flow for forming a base ink layer on the anchor layer in this embodiment. [Figure 14] This example shows a flow for forming a base ink layer on an aqueous ink layer in this embodiment. [Figure 15] This example shows a flow for forming a base ink layer on a coating layer in this embodiment. [Figure 16] An example of the flow for performing corona processing in this embodiment is shown. [Figure 17] This shows an example of the flow for forming an additional coating layer in this embodiment. [Figure 18] An example of the manufacturing flow of the packaging container of this embodiment is shown. [Figure 19] This example shows a flow of forming an anchor layer on a printing substrate and a coating layer on an aqueous ink layer in this embodiment. [Figure 20] This example shows a flow for forming a base ink layer on the side of the printing substrate opposite to the side where the aqueous ink layer is formed. [Figure 21] This example shows a flow for forming a base ink layer on a printing substrate in this embodiment. [Figure 22] This example shows a flow for forming a base ink layer on the anchor layer in this embodiment. [Figure 23] An example of the flow for performing corona processing in this embodiment is shown. [Figure 24] This shows an example of the flow for forming an additional coating layer in this embodiment. [Modes for carrying out the invention]

[0047] The present invention will be described below through embodiments, but these embodiments are not intended to limit the scope of the claimed invention. Furthermore, not all combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0048] Figure 1 shows an example of the overall layer configuration of the packaging container 300 in this embodiment. The packaging container 300 according to the present invention can have a clear printed image using an aqueous ink composition even after heat treatment such as retort processing. The packaging container 300 may include a packaging support section 100 and a printing section 200 provided on one surface of the packaging support section 100.

[0049] The packaging support section 100 is the main body of the packaging container 300 and contains most of the contents. The packaging support section 100 may be a single layer of film. The packaging support section 100 may be made of laminated films. The packaging support section 100 may also be a can.

[0050] If the packaging support part 100 is a single layer of film or a laminate of films, the packaging container may be a pouch, for example. If the packaging support part 100 is a laminate of films, the packaging container 300 may be a retort pouch, for example. The retort pouch may be for food use. The pouch may be for hygiene products such as detergents, liquid soaps, or shampoos, but is not limited to these.

[0051] The film may be unoriented polypropylene film (CPP: Cast Polypropylene Film). The film may also be nylon film. CPP and nylon film have excellent heat resistance and are resistant to retort processing, making them suitable materials for the packaging support part 100.

[0052] If the packaging support section 100 is made of laminated films, at least one of the laminated films may contain a metal foil. The metal foil may be aluminum foil.

[0053] If the packaging support part 100 is a can, the packaging container 300 may be a can container. The material of the can container body may be steel or aluminum, but is not limited to these. The can container may be a can container in which a label printed on film is laminated to the can body, in which case the printed part 200 becomes the label.

[0054] The printed section 200 is located on the outer surface of the packaging container 300 and is an image layer that represents characters, patterns, etc. The printed section 200 may be formed by printing on all or at least a part of the printing substrate 1, which will be described later, using an ink composition. As will be described later, if the printed section 200 is formed from an aqueous ink composition, the burden on the environment and human health can be reduced.

[0055] Figure 2 shows an example of the overall layer structure of the packaging container 300 in this embodiment. The packaging container 300 may include a packaging support portion 100 and a printing portion 200 provided on one surface of the packaging support portion 100. The printing portion 200 may include a printing substrate 1, an anchor layer 2, an aqueous ink layer 3, and a coating layer 4. In the packaging container 300 shown in Figure 2, the side of the printing portion 200 opposite to the printing substrate 1 may be provided on one surface of the packaging support portion 100. The packaging container 300 can be formed by adhering the coating layer 4, which is present on the side opposite to the printing substrate 1, to one surface of the packaging support portion 100.

[0056] The printing substrate 1 is the substrate used for inkjet printing. The printing substrate 1 may be a film. For example, the printing substrate 1 is a polypropylene resin film. For example, the printing substrate 1 is a polyethylene terephthalate (PET) resin film. As an example, the printing substrate 1 is a barrier PET resin film in which a barrier layer is coated on a PET resin film to enhance its barrier properties. The barrier layer may contain aluminum oxide or silicon dioxide, etc. The printing substrate 1 may be subjected to corona treatment to modify its surface. Details of the corona treatment will be described later.

[0057] The anchor layer 2 serves as a base for images such as patterns formed by the water-based ink layer 3. The anchor layer 2 also prevents color mixing when forming the water-based ink layer 3 using a multi-color water-based ink composition. The anchor layer 2 is provided on the printing substrate 1 and may cover all or at least part of the printing substrate 1. If the printing substrate 1 is subjected to corona treatment, the anchor layer 2 may not be provided. In this case, the water-based ink layer 3 is provided to directly cover the printing substrate 1.

[0058] The anchor layer 2 may be formed by curing the first resin component with a curing component. The curing component may further cure the water-based ink layer 3. Details of the curing component and the first resin component will be described later. The thickness of the anchor layer 2 is 0.05 g / m². 2 More than 10.00g / m 2 The following is possible: The thickness of the anchor layer 2 being within the above range allows for firm holding and fixing of the water-based ink layer 3 provided thereon, thereby improving adhesion between the printing substrate 1 and the water-based ink layer 3.

[0059] The anchor layer 2 may be a porous layer. In this case, when forming the aqueous ink layer 3 on the anchor layer 2 using the aqueous ink composition, the aqueous ink composition may penetrate into the anchor layer 2. Therefore, the aqueous ink layer 3 does not necessarily have to be laminated in layers on top of the anchor layer 2, as shown in Figure 2.

[0060] The aqueous ink layer 3 is an image layer on the outer surface of the packaging container 300, in which characters, patterns, etc., are expressed using an aqueous ink composition. The aqueous ink layer 3 may be formed to cover all or at least a portion of the printing substrate 1 or the anchor layer 2.

[0061] The image formed on the aqueous ink layer 3 may be a color image using a multi-color aqueous ink composition. The image formed on the aqueous ink layer 3 may be a monochrome image using a single-color aqueous ink composition.

[0062] For example, the aqueous ink layer 3 may be provided by performing direct inkjet printing on the printing substrate 1 or the anchor layer 2. For example, the aqueous ink layer 3 may be provided by performing offset inkjet printing on the printing substrate 1 or the anchor layer 2. Details of these inkjet printing methods will be described later.

[0063] The thickness of the aqueous ink layer 3 may be 0.1 μm or more and 5 μm or less. Preferably, the thickness of the aqueous ink layer 3 may be 0.5 μm or more and 2 μm or less.

[0064] The surface free energy of the aqueous ink layer 3 calculated by the Kaelble-Uy method is 30 mJ / m at a temperature of 25°C 2 or more and 70 mJ / m 2 or less may be acceptable. Preferably, the surface free energy of the aqueous ink layer 3 calculated by the Kaelble-Uy method is 40 mJ / m at a temperature of 25°C 2 or more and 70 mJ / m 2 or less may be acceptable. When the surface free energy of the aqueous ink layer 3 is within the above range, the packaging container 300 can stably form the coating layer 4 on the aqueous ink layer 3 and can have an image with excellent image quality.

[0065] The coating layer 4 is a layer that protects the anchor layer 2 and the aqueous ink layer 3 from physical impact, high temperature during retort processing, and deterioration caused by oxygen, moisture, etc. The coating layer 4 may be provided so as to cover all or at least a part of the region of the printing substrate 1. Alternatively, the coating layer 4 may be provided so as to cover all or at least a part of the region of the aqueous ink layer 3.

[0066] The coating layer 4 may be formed by curing a second resin component and may contain a curing component for curing at least the first resin component. Details of the second resin component and the curing component will be described later. When the anchor layer 2 and the aqueous ink layer 3 are resistant to retort processing, the coating layer 4 may not be provided.

[0067] The thickness of the coating layer 4 may be between 0.5 μm and 5 μm. By having the thickness of the coating layer 4 within the above range, the printed image of the water-based ink layer 3 is adequately protected from physical impact, high temperatures during retort processing, and degradation due to oxygen and moisture, and the packaging container 300 can have improved durability.

[0068] The printing section 200 may be bonded to the packaging support section 100 with an adhesive or the like. A known adhesive can be used.

[0069] For example, as shown in Figure 2, the packaging container 300 may be formed by adhering the coating layer 4 of the printed portion 200 to one surface of the packaging support portion 100. The packaging container 300 may comprise the packaging support portion 100, the coating layer 4, the water-based ink layer 3, the anchor layer 2, and the printing substrate 1 in this order.

[0070] In the embodiment of the packaging container 300 shown in Figure 2, the coating layer 4 of the printed section 200 is formed by adhering it to one surface of the packaging support section 100, so that the aqueous ink layer 3 is protected by the printing substrate 1. Furthermore, in the embodiment of the packaging container 300 shown in Figure 2, because the coating layer 4 and the packaging support section 100 are in close contact, the coating layer 4 functions as an inner coat, resulting in excellent adhesion between the packaging support section 100 and the printed section 200. Therefore, according to this embodiment, while reducing the impact on the environment and human health by using aqueous ink, the printed image of the aqueous ink layer 3, which is sensitive to heat and moisture, can be appropriately protected even during heating and boiling processes during retort processing.

[0071] Figure 3 shows an example of the overall layer structure of the packaging container 300 in this embodiment. The packaging container 300 may have the printed substrate 1 side of the printed section 200 provided on one surface of the packaging support section 100. The packaging container 300 may consist of the packaging support section 100, the printed substrate 1, the anchor layer 2, the water-based ink layer 3, and the coating layer 4 in this order. Such a packaging container 300 can be formed by bonding the printed substrate 1 of the printed section 200 to one surface of the packaging support section 100. Adhesive may be used to bond the packaging support section 100 and the printed section 200. Unless otherwise specified, the descriptions of each layer may be as previously described.

[0072] In the embodiment shown in Figure 3, the packaging container 300 is formed by adhering the printing substrate 1 of the printing section 200 to one surface of the packaging support section 100, so that the aqueous ink layer 3 is protected by the coating layer 4. Furthermore, in the packaging container 300 of the embodiment shown in Figure 3, the coating layer 4 functions as an overcoat, providing enhanced scratch resistance. Moreover, according to this embodiment, the printed image of the aqueous ink layer 3, which is sensitive to heat and moisture, can be appropriately protected even during heating and boiling processes during retort processing.

[0073] Figure 4 shows an example of the overall layer structure of the packaging container 300 in this embodiment. In the packaging container 300 of the embodiment shown in Figure 2, the printed section 200 may further include a base ink layer 21 provided on the aqueous ink layer 3. The packaging container 300 may comprise the packaging support section 100, the coating layer 4, the base ink layer 21, the aqueous ink layer 3, the anchor layer 2, and the printing substrate 1 in this order.

[0074] The base ink layer 21 serves as a base to enhance the clarity of the printed image on the water-based ink layer 3. All or at least part of the area of ​​the base ink layer 21 may be covered by the water-based ink layer 3. The base ink layer 21 may be a layer formed from oil-based ink containing pigment ink, or from water-based ink. The base ink layer 21 may be a colored ink (e.g., white, black, or transparent ink) or a metallic colored ink (e.g., oil-based gold or silver ink). Using a metallic colored ink can give the packaging container 300 a metallic luster and create a sense of luxury. The base ink layer 21 may be a single layer or multiple layers, as described later. The base ink layer 21 may form a solid pattern or a pattern such as stripes or a checkerboard. The base ink layer 21 may be formed by various coatings such as gravure coating, or various printing methods such as inkjet printing, as described later.

[0075] When an oil-based ink is used as the ink composition for forming the base ink layer 21, the durability of the base image formed on the packaging container 300 can be increased while reducing the cost of ink required for printing, and the drying time of the ink can also be reduced. Furthermore, when an aqueous ink is used as the ink composition for forming the base ink layer 21, the burden on the environment and human health can be reduced together with the aqueous ink layer 3.

[0076] The thickness of the base ink layer 21 may be between 1 μm and 3 μm. Having the base ink layer 21 within this range ensures that the printed image of the water-based ink layer 3 is clear. The coating layer 4 covers all or at least part of the area where the base ink layer 21 is provided.

[0077] In the embodiment shown in Figure 4, the packaging container 300 has the coating layer 4 of the printed section 200 formed in close contact with one surface of the packaging support section 100, so that the aqueous ink layer 3 is protected by the printing substrate 1. Furthermore, according to this embodiment, the presence of the undercoat ink layer 21 makes the printed image of the aqueous ink layer 3 clearer, increasing the decorative properties and freedom of printing. Therefore, according to this embodiment, while using aqueous ink to reduce the impact on the environment and human health, the printed image of the aqueous ink layer 3, which is sensitive to heat and moisture, can be appropriately protected even during heating and boiling processes during retort processing, resulting in a clear printed image.

[0078] Figure 5 shows an example of an embodiment of the base ink layer 21 in the packaging container 300 of the embodiment shown in Figure 4. The base ink layer 21 is not limited to a single layer, but may consist of multiple laminated ink layers. The base ink layer 21 may contain different colors for each layer. In Figure 5, the base ink layer 21 has a laminated structure of three layers: a first base ink layer 211, a second base ink layer 212, and a third base ink layer 213. The description of each layer from the first base ink layer 211 to the third base ink layer 213 can be directly applied to the base ink layer 21 as described above.

[0079] For example, the first base ink layer 211 may be a layer of oil-based ink such as red, the second base ink layer 212 may be a layer of oil-based ink of a metallic color such as silver, and the third base ink layer 213 may be a layer of oil-based ink such as white. The third base ink layer 213 is a solid pattern and may be formed over the entire surface or almost the entire surface of the printing substrate 1.

[0080] For example, the first and second base ink layers 211 and 212 may be simple patterns such as stripes or checkerboards, pictures, or characters, rather than solid patterns, and may be formed on a portion of the printing substrate 1. The third base ink layer 213 may be a layer of water-based ink rather than oil-based ink.

[0081] The first base ink layer 211, the second base ink layer 212, and the third base ink layer 213 may be laminated in this order, or their order may be reversed. One or more of the first base ink layer 211, the second base ink layer 212, and the third base ink layer 213 may be omitted. Also, although Figure 5 shows a case where the base ink layer 21 has a three-layer laminated structure, the laminated structure of the base ink layer 21 is not limited to three layers. The side of the base ink layer 211 with the third base ink layer 213 may be in contact with the coating layer 4, or the side of the first base ink layer 211 may be in contact with the coating layer 4.

[0082] According to this embodiment, the lamination of the base ink layer 21 makes the printed image of the water-based ink layer 3 clearer, further enhancing the decorative properties and printing flexibility.

[0083] Figure 6 shows an example of the overall layer structure of the packaging container 300 in this embodiment. In the packaging container 300 of the embodiment shown in Figure 2, the printed portion 200 may further include a base ink layer 21 provided on the coating layer 4. The packaging container 300 may comprise the packaging support portion 100, the base ink layer 21, the coating layer 4, the water-based ink layer 3, the anchor layer 2, and the printing substrate 1 in this order. In this example, the base ink layer 21 may be a layer formed between the coating layer 4 and the packaging support portion 100, covering all or at least a portion of the coating layer 4.

[0084] In the embodiment shown in Figure 6, the packaging container 300 has a base ink layer 21 of the printed section 200 that is in close contact with one surface of the packaging support section 100, so that the aqueous ink layer 3 is protected by the printing substrate 1. Furthermore, according to this embodiment, the presence of the base ink layer 21 makes the printed image of the aqueous ink layer 3 clearer, and the degree of decorative capability and printing freedom can be increased. Therefore, according to this embodiment, while using aqueous ink to reduce the impact on the environment and human health, the printed image of the aqueous ink layer 3, which is sensitive to heat and moisture, can be appropriately protected even during heating or boiling processes such as retort processing, and a clear printed image can be obtained.

[0085] In addition, in the packaging container 300 of the embodiment shown in Figure 6, the base ink layer 21 may be a laminated structure of a first base ink layer 211, a second base ink layer 212, and a third base ink layer 213, as shown in Figure 5. The descriptions of the first base ink layer 211, the second base ink layer 212, and the third base ink layer 213 can be applied as previously described.

[0086] Figure 7 shows an example of the overall layer structure of the packaging container 300 in this embodiment. In the packaging container 300 of the embodiment shown in Figure 3, the printed portion 200 may further include a base ink layer 21 provided on the printing substrate 1. The packaging container 300 may comprise, in this order, a packaging support portion 100, a printing substrate 1, a base ink layer 21, an anchor layer 2, a water-based ink layer 3, and a coating layer 4. The base ink layer 21 may be a layer formed between the printing substrate 1 and the anchor layer 2 so as to cover all or at least a portion of the printing substrate 1.

[0087] In the embodiment shown in Figure 7, the packaging container 300 is formed by adhering the printing substrate 1 of the printing section 200 to one surface of the packaging support section 100, so that the aqueous ink layer 3 is protected by the coating layer 4. Furthermore, in the embodiment shown in Figure 7, the coating layer 4 functions as an overcoat, resulting in enhanced scratch resistance.

[0088] According to this embodiment, the printed image of the water-based ink layer 3, which is sensitive to heat and moisture, can be appropriately protected even during heating and boiling processes during retort processing. Furthermore, according to this embodiment, the presence of the base ink layer 21 makes the printed image of the water-based ink layer 3 clearer, increasing the decorative properties and freedom of printing. In addition, by providing an anchor layer 2 between the base ink layer 21 and the water-based ink layer 3, the water-based ink layer 3 can be firmly held and fixed on the base ink layer 21, improving the adhesion between the printing substrate 1 and the water-based ink layer 3.

[0089] In addition, in the packaging container 300 of the embodiment shown in Figure 7, the base ink layer 21 may be a laminated structure of a first base ink layer 211, a second base ink layer 212, and a third base ink layer 213, as shown in Figure 5. The descriptions of the first base ink layer 211, the second base ink layer 212, and the third base ink layer 213 can be applied as previously described.

[0090] Figure 8 shows an example of the overall layer structure of the packaging container 300 in this embodiment. In the packaging container 300 of the embodiment shown in Figure 3, the printed portion 200 may further include a base ink layer 21 provided on the anchor layer 2. The packaging container 300 may comprise, in this order, a packaging support portion 100, a printing substrate 1, an anchor layer 2, a base ink layer 21, a water-based ink layer 3, and a coating layer 4. The base ink layer 21 may be a layer formed between the anchor layer 2 and the water-based ink layer 3 so as to cover all or at least a portion of the area of ​​the anchor layer 2.

[0091] In the embodiment shown in Figure 8, the packaging container 300 is formed by adhering the printing substrate 1 of the printing section 200 to one surface of the packaging support section 100, so that the aqueous ink layer 3 is protected by the coating layer 4. Furthermore, in the embodiment shown in Figure 8, the coating layer 4 functions as an overcoat, resulting in enhanced scratch resistance.

[0092] According to this embodiment, the printed image of the water-based ink layer 3, which is susceptible to heat and moisture, can be appropriately protected even during heating and boiling processes during retort processing. Furthermore, according to this embodiment, the presence of the undercoat ink layer 21 makes the printed image of the water-based ink layer 3 clearer, increasing the decorative properties and printing flexibility.

[0093] Furthermore, by providing an anchor layer 2 between the printing substrate 1 and the base ink layer 21, the base ink layer 21 and the water-based ink layer 3 provided on top of it can be firmly held and fixed on the printing substrate 1, thereby improving the adhesion between the printing substrate 1 and the water-based ink layer 3. If the base ink layer 21 contains the same type of resin as the water-based ink layer 3 (for example, acrylic resins), the water-based ink layer 3 and the base ink layer 21 are fixed more firmly, further improving the adhesion between the printing substrate 1 and the water-based ink layer 3.

[0094] In addition, in the packaging container 300 of the embodiment shown in Figure 8, the base ink layer 21 may be a laminated structure of a first base ink layer 211, a second base ink layer 212, and a third base ink layer 213, as shown in Figure 5. The descriptions of the first base ink layer 211, the second base ink layer 212, and the third base ink layer 213 can be applied as previously described.

[0095] Figure 9 shows an example of the overall layer configuration of the packaging container 300 in this embodiment. In the packaging container 300 of the embodiment shown in Figure 7, the printed section 200 may further include an additional coat layer 42 provided on the coat layer 4. The packaging container 300 may consist of the packaging support section 100, the printing substrate 1, the base ink layer 21, the anchor layer 2, the water-based ink layer 3, the coat layer 4, and the additional coat layer 42 in this order.

[0096] The additional coating layer 42 may be formed to cover all or at least a portion of the coating layer 4 after the packaging support portion 100 and the printing portion 200 have been bonded together. Alternatively, the additional coating layer 42 may be provided to cover all or at least a portion of the coating layer 4 before the packaging support portion 100 and the printing portion 200 have been bonded together. The description of the additional coating layer 42 may be directly applied to the description of the coating layer 4.

[0097] According to this embodiment, by providing an additional coating layer 42 to the packaging container 300, the printed image of the water-based ink layer 3, which is susceptible to heat and moisture, can be more effectively protected from high temperatures during retort processing. In this embodiment, the case in which the additional coating layer 42 is provided on a packaging container 300 that has a base ink layer 21 has been described, but the additional coating layer 42 may be provided on a packaging container 300 that does not have a base ink layer 21.

[0098] The additional coating layer 42 may be provided to cover all or at least a portion of the coating layer 4 in Figure 3. Furthermore, in the packaging container 300 of the embodiments shown in Figures 2, 4, and 6, the additional coating layer 42 may be provided to cover all or at least a portion of the surface opposite to the packaging support portion 100 (the outer peripheral surface side of the packaging container 300). In the packaging container 300 of the embodiment shown in Figure 8, the additional coating layer 42 may be provided to cover all or at least a portion of the coating layer 4. The description of the additional coating layer 42 can be applied as previously described.

[0099] Figure 10 shows an example of the overall layer configuration of the packaging container 300 in this embodiment. The packaging container 300 may include a packaging support portion 100 and a printing portion 200 provided on one surface of the packaging support portion 100. The printing portion 200 may include a printing substrate 1 and an aqueous ink layer 3 applied on the printing substrate 1. In the packaging container 300, the printing portion 200 may be provided on one surface of the packaging support portion 100 with the printing substrate 1 side facing the printing substrate 1. Furthermore, the printing portion 200 may have a base ink layer 21 on the surface of the printing substrate 1 opposite to the surface on which the aqueous ink layer 3 is provided.

[0100] The water-based ink layer 3 may be formed to cover all or at least a portion of the printing substrate 1. The base ink layer 21 may be a layer formed to cover all or at least a portion of the printing substrate 1.

[0101] Adhesive may be used to bond the packaging support portion 100 and the printing portion 200. The packaging container 300 may comprise the packaging support portion 100, the base ink layer 21, the printing substrate 1, and the water-based ink layer 3 in this order. Such a packaging container 300 can be formed by bonding the base coat layer 21, which is located on the side of the printing substrate 1 opposite to the side on which the water-based ink layer 3 is provided, to one side of the packaging support portion 100. In the packaging container 300 of the embodiment shown in Figure 10, an anchor layer 2 may be further formed on the printing substrate 1. Also, a coat layer 4 may be formed on the water-based ink layer 3. Furthermore, unless otherwise specified, the descriptions of each layer may be as previously described.

[0102] In the packaging container 300 of the embodiment shown in Figure 10, the presence of the base ink layer 21 makes the printed image of the water-based ink layer 3 clearer, increasing the degree of decorative capability and printing freedom. Therefore, according to this embodiment, it is possible to have a clear printed image while reducing the impact on the environment and human health using water-based ink.

[0103] Furthermore, according to this embodiment, by providing a base ink layer 21 between the packaging support part 100 and the printing substrate 1, the thickness of layers such as the water-based ink layer 3 formed on the outer peripheral surface of the printing substrate 1 can be reduced. As a result, cracking due to the thickness of the layers can be suppressed during heating or boiling during retort processing, and the packaging container 300 can have improved durability.

[0104] Figure 11 shows an example of the manufacturing flow for the packaging container 300 of this embodiment. The packaging container 300 of this embodiment can be manufactured by the steps of forming a printed section 200 including a printing substrate 1, an anchor layer 2, an aqueous ink layer 3, and a coating layer 4, and providing the printed section 200 on one surface of the packaging support section 100.

[0105] The steps for forming the printed portion 200 may include forming an anchor layer 2 on the printing substrate 1, forming an aqueous ink layer 3 on the anchor layer 2, and forming a coating layer 4 on the aqueous ink layer 3, thereby forming a printed portion including the printing substrate 1, the anchor layer 2, the aqueous ink layer 3, and the coating layer 4.

[0106] The packaging container 300 may be manufactured by performing the processes S20 to S70 in Figure 11. For the sake of explanation, the processes S20 to S70 will be described in order, but at least some of these processes may be performed in parallel, or the steps may be rearranged without departing from the spirit of the present invention.

[0107] First, in S20, an anchor layer 2 is formed on the printing substrate 1. The anchor layer 2 may be formed by applying and curing an anchor composition. The anchor composition may be applied to all or at least a portion of the printing substrate 1. The anchor composition comprises a first resin component and a solvent that dissolves the first resin component.

[0108] The first resin component may be cured by a curing component contained in the coating composition that forms the coating layer 4 in S40. The first resin component may contain functional groups for curing. The first resin component may include polyurethane resin, epoxy resin, acrylic resin, or polyester resin.

[0109] The solvent can be water, an organic solvent, or other known solvents. For example, the anchor composition may be made aqueous by using water as the solvent. As the organic solvent, methyl ethyl ketone, ethyl acetate, n-propyl acetate, isopropyl alcohol, n-propyl alcohol, or butyl acetate can be used, but are not limited to these.

[0110] The anchor composition may further contain a curing component for curing the first resin component. The curing component may react with the first resin component to crosslink or extend the polymer chains of the first resin component. If the first resin component contains a polyurethane resin, the curing component may contain an isocyanate resin. If the first resin component contains an epoxy resin, the curing component may contain an amino resin or an isocyanate resin. If the first resin component contains an acrylic resin, the curing component may contain an acrylic resin having oxazoline or an isocyanate resin. If the first resin component contains a polyester resin, the curing component may contain an isocyanate resin.

[0111] The anchor composition may further contain titanium dioxide. By including titanium dioxide in the anchor composition, the excellent whiteness of titanium dioxide makes it possible to omit the formation of the base ink layer 21 described later.

[0112] The anchor composition may be cured by heating, drying, or hot air treatment. After completing S20, proceed to S30.

[0113] Next, in S30, an aqueous ink layer 3 is formed on the anchor layer 2. The aqueous ink layer 3 may be formed by inkjet printing an aqueous ink composition onto the anchor layer 2. The aqueous ink composition may be inkjet printed so as to cover all or at least a portion of the area of ​​the anchor layer 2. For example, the inkjet printing may be performed by the method described in Japanese Patent Publication No. 6314468.

[0114] Inkjet printing may involve directly ejecting an aqueous ink composition from an inkjet head provided in an inkjet printer onto the anchor layer 2. For example, inkjet printing may be a direct-type inkjet printing method in which an aqueous ink composition is directly ejected from an inkjet head provided in an inkjet printer onto the anchor layer 2. For example, inkjet printing may be an offset-type inkjet printing method in which an aqueous ink composition is ejected from an inkjet head provided in an inkjet printer onto a blanket, and the inkjet image formed on the blanket is transferred to the anchor layer 2.

[0115] A water-based ink composition may contain a pigment, a resin component, water, and an organic solvent. The water-based ink composition contains water in the largest amount by weight.

[0116] The pigment may be an organic pigment or an inorganic pigment. The amount of pigment may be 1 part by weight or more and 50 parts by weight or less per 100 parts by weight of the aqueous ink composition.

[0117] The resin component may be, but is not limited to, acrylic resin, polyester resin, or polyurethane resin. The amount of the resin component may be 1 part by weight or more and 20 parts by weight or less per 100 parts by weight of the aqueous ink composition.

[0118] The organic solvent may be, but is not limited to, alcohol compounds or ether compounds. The organic solvent may be 20 parts by weight or more and 99 parts by weight or less per 100 parts by weight of the aqueous ink composition.

[0119] Furthermore, the aqueous ink composition may contain a surfactant. The surfactant may be anionic, nonionic, cationic, or amphoteric. The amount of surfactant may be 0.001 parts by weight or more and 2 parts by weight or less per 100 parts by weight of the aqueous ink composition. By including a surfactant in the aqueous ink composition, the surface free energy of the aqueous ink layer 3 can be adjusted to an appropriate range. In addition to these, the aqueous ink composition may further contain antioxidants, ultraviolet absorbers, chelating agents, preservatives, and the like.

[0120] The water-based ink composition may be cured by heating, drying, hot air treatment, or electron beam irradiation. After completing S30, proceed to S40.

[0121] Next, in S40, a coating layer 4 is formed on the aqueous ink layer 3. The formation of the coating layer 4 creates a printed portion 200 including the printing substrate 1, anchor layer 2, aqueous ink layer 3, and coating layer 4.

[0122] The coating layer 4 may be formed by directly or indirectly applying the coating composition to the aqueous ink layer 3 and curing it. The coating composition may be applied so as to cover all or at least part of the aqueous ink layer 3. The coating composition comprises a second resin component, a curing component, and a solvent. The coating composition may be oil-based (i.e., the main component of the solvent is an organic solvent), but it is preferable that it be aqueous (i.e., the main component of the solvent is water) from the viewpoint of reducing the burden on the human body and the environment.

[0123] The second resin component may be a polymer containing functional groups for curing. For example, the second resin component may be the same as the first resin component. For example, the second resin component may be different from the first resin component. If the second resin component is different from the first resin component, the second resin component may include epoxy resin, urethane resin, polyester resin, or acrylic resin.

[0124] The curing component may react with the first resin component to crosslink or extend the polymer chains of the first resin component. If the first resin component contains a polyurethane resin, the curing component may contain an isocyanate resin. If the first resin component contains an epoxy resin, the curing component may contain an amino resin or an isocyanate resin. If the first resin component contains an acrylic resin, the curing component may contain an acrylic resin having oxazoline or an isocyanate resin. If the first resin component contains a polyester resin, the curing component may contain an isocyanate resin.

[0125] For example, if the first resin component contains an acrylic resin having a carboxyl group, an acrylic resin having an acid anhydride group, or an acrylic resin having a hydroxyl group, the curing component may contain an acrylic resin having a glycidyl group. If the first resin component contains a resin having a hydroxyl group or an epoxy group, the curing component may contain an acrylic resin having an acid anhydride group. If the first resin component contains a resin having a polyisocyanate, the curing component may contain an acrylic resin having an oxazolidine. If the first resin component contains a polyamine or a resin having a carboxyl group, the curing component may contain an acrylic resin having a cyclocarbonate. If the first resin component contains an acrylic resin copolymerized with trialkoxyvinylsilane or the like, the curing component may contain an acrylic resin having an alkoxysilane. If the first resin component contains an isocyanate or an acrylic resin having an acid anhydride group, the curing component may contain an acrylic resin having a siloxy group. If the first resin component contains an amino group, isocyanate, or unsaturated group, the curing component may contain an acrylic resin having an active methylene group. If the first resin component contains an acrylic resin or amino resin having a methoxy group, the curing component may contain an acrylic resin having both a methoxy group and a methyl ester group. If the first resin component contains an aliphatic epoxy resin or a resin having a β-hydroxylalkylamide, the curing component may contain an acrylic resin having a carboxyl group.

[0126] The amount of the curing component may be 5 to 50 parts by weight per 100 parts by weight of the first resin component. The amount of the curing component within this range ensures that the first resin component is properly cured. Furthermore, if the aqueous ink composition contains a resin that can be used as the first resin component, the curing component may, in addition to curing the first resin component, also cure the aqueous ink composition contained in the aqueous ink layer 3.

[0127] The coating composition may further contain titanium dioxide. The inclusion of titanium dioxide in the coating composition allows for the omission of the formation of the undercoat ink layer 21, as described later, due to the excellent whiteness of titanium dioxide. In this case, the coating composition is preferably oil-based in order to disperse the titanium dioxide.

[0128] The coating composition may be cured by heating, drying, hot air treatment, or electron beam irradiation. The coating composition may also be cured by the curing component contained in the coating composition. When the coating composition is cured, the first resin component contained in the anchor layer 2 is also cured, so the anchor layer 2 and the coating layer 4 are firmly crosslinked with the aqueous ink layer 3 sandwiched in between, thereby fixing the aqueous ink layer 3 more firmly. In particular, when the aqueous ink layer 3 is formed by an inkjet method, there are limitations on the amount of resin component that can be contained in the ink, and it has been difficult to ensure the durability of the aqueous ink layer 3, but the aqueous ink layer 3 can be firmly fixed by the above embodiment.

[0129] By following the steps described above, a printing section 200 comprising a printing substrate 1, an anchor layer 2, an aqueous ink layer 3, and a coating layer 4 can be formed. After forming the printing section 200, the process proceeds to S50.

[0130] Next, in S50, the formed printed portion 200 is attached to one surface of the packaging support portion 100 to form the packaging container 300. The printed portion 200 can be formed by adhering the side with the printing substrate 1 to one surface of the packaging support portion 100. In this case, the packaging container 300 will have a front-printed configuration. Alternatively, the printed portion 200 can be formed by adhering the side opposite to the printing substrate 1 to one surface of the packaging support portion 100. In this case, the packaging container 300 will have a back-printed configuration.

[0131] An adhesive may be used to bond the packaging support part 100 and the printing part 200. Any known adhesive can be used. For example, an acrylic resin adhesive may be used. For example, a polyurethane resin adhesive may be used. For example, a polyester resin adhesive may be used. As an example, a polyester resin adhesive is preferably one in which polyester resin is the base resin and one of phenol resin, amino resin, or isocyanate resin is used as the curing agent.

[0132] The packaging support part 100 may be a single layer of film. The packaging support part 100 may be a laminated film. If the packaging support part 100 is a laminated film, at least one of the laminated films may contain metal foil. The metal foil may be aluminum foil. The packaging support part 100 may also be a can. After forming the packaging container 300, proceed to S60.

[0133] Next, in S60, the packaging container 300 is inspected. For example, the inspection may involve checking whether there are any dents or holes on the outer or inner surface of the packaging container 300. For example, the inspection may involve checking whether the printed image of the water-based ink layer 3 is clear. For example, the inspection may involve checking whether there are any blisters in the printed image of the water-based ink layer 3. For example, the inspection may involve checking whether there are any stains or scratches on the outer surface of the packaging container 300.

[0134] Next, in S70, the contents are filled into the inspected packaging container 300. The packaging container 300 filled with contents is then sealed. The filling and sealing may be carried out by known methods. Alternatively, the filled and sealed packaging container 300 may be subjected to retort processing. By following the flow in Figure 11, the packaging container 300 shown in the embodiment of Figure 2 or Figure 3 can be manufactured.

[0135] Next, a modified version of this embodiment is shown. A packaging container may be manufactured by combining at least some of the configurations of the modified versions shown below.

[0136] [First variation] In this embodiment, a case in which no base ink layer 21 is formed has been described, but Figure 12 shows the step of forming the base ink layer 21 on the printing substrate 1 before proceeding to step S20. In S15, printing may be performed using an oil-based ink composition containing pigment ink or an aqueous ink composition so as to cover all or at least part of the printing substrate 1.

[0137] The base ink layer 21 may have patterns such as solid colors or images formed by coating or printing the ink composition. For example, gravure coating may be used as the coating. Inkjet printing or other printing methods may be used as the printing method.

[0138] In printing to form the base ink layer 21, the ink composition may be a single color such as white, metallic, or transparent. In printing to form the base ink layer 21, the ink composition may be a multiple color. The base ink layer 21 may be formed by heating, drying, or treating the ink composition with hot air.

[0139] After forming a base ink layer 21 on the printing substrate 1, the process proceeds to step S20. At this point, step S20 is the step of forming an anchor layer 2 on at least one of the printing substrate 1 and the base ink layer 21. The anchor layer 2 may be provided so as to cover all or at least a portion of the base ink layer 21. By additionally performing step S15, the packaging container 300 shown in the embodiment of Figure 7 can be obtained.

[0140] Furthermore, the base ink layer 21 may be laminated. For example, as shown in Figure 5, the base ink layer 21 may be formed by laminating a first base ink layer 211, a second base ink layer 212, and a third base ink layer 213. For example, the first base ink layer 211 may be formed by printing with an oil-based ink composition or an aqueous ink composition so as to cover all or at least a portion of the printing substrate 1, and then treating it with heat, drying, or hot air. Next, the second base ink layer 212 may be formed by printing with an oil-based ink composition or an aqueous ink composition so as to cover all or at least a portion of the first base ink layer 211, and then treating it with heat, drying, or hot air. Next, the third base ink layer 213 may be formed by printing with an oil-based ink composition or an aqueous ink composition so as to cover all or at least a portion of the area of ​​the third base ink layer 213 by the second base ink layer 212, and then treating it with heat, drying, or hot air.

[0141] For example, the first base ink layer 211 may be a layer printed using a single-color ink composition. For example, the first base ink layer 211 may be a layer printed using a colored oil-based ink composition such as red. For example, the second base ink layer 212 may be a layer printed using a single-color ink composition. For example, the second base ink layer 212 may be a layer printed using a metallic oil-based ink composition such as silver. For example, the third base ink layer 213 may be a layer printed with solid color using a single-color ink composition. For example, the third base ink layer 213 may be a layer printed with solid color using a white water-based or oil-based ink composition.

[0142] The second base ink layer 212 may be formed after the first base ink layer 211 has been completely formed. The second base ink layer 212 may be formed without completely drying the ink composition contained in the first base ink layer 211. The third base ink layer 213 may be formed after the second base ink layer 212 has been completely formed. The third base ink layer 213 may be formed without completely drying the ink composition contained in the second base ink layer 212.

[0143] [Second variation] In this embodiment, the case in which no base ink layer 21 is formed has been described, but Figure 13 shows the step of forming the base ink layer 21 on the anchor layer 2 before proceeding to step S30. In S25, printing may be performed using an oil-based ink composition containing pigment ink or an aqueous ink composition so as to cover all or at least part of the anchor layer 2. The formation of the base ink layer 21 may be carried out by the same procedure as in the first modified example.

[0144] After forming the base ink layer 21, the process proceeds to step S30. The aqueous ink layer 3 may be provided so as to cover all or at least a portion of the base ink layer 21. By additionally performing step S25, the packaging container 300 shown in the embodiment of Figure 8 can be obtained.

[0145] Furthermore, the base ink layer 21 may be laminated. The explanation for the case where the base ink layer 21 is laminated can be applied as is to the explanation given in the first modified example.

[0146] [Third variation] In this embodiment, the case in which no base ink layer 21 is formed is described, but Figure 14 shows the step of forming the base ink layer 21 on the aqueous ink layer 3 before proceeding to step S40. In S35, the base ink layer 21 may be formed so as to cover all or at least part of the aqueous ink layer 3. The base ink layer 21 may be printed using an oil-based ink composition containing pigment ink or an aqueous ink composition. The formation of the base ink layer 21 may be carried out by the same procedure as in the first modified example.

[0147] After forming the base ink layer 21, the process proceeds to step S40. The coating layer 4 may be provided so as to cover all or at least a portion of the base ink layer 21. By additionally performing step S35, the packaging container 300 shown in the embodiment of Figure 4 can be obtained.

[0148] [Fourth variation] In this embodiment, the case in which no base ink layer 21 is formed has been described. However, Figure 15 shows a step in which, instead of step S40, a coating layer 4 is formed on the aqueous ink layer 3, and the base ink layer 21 is formed on the coating layer 4. In S41, the coating layer 4 is formed so as to cover all or at least part of the aqueous ink layer 3. The step of forming the coating layer 4 in S41 may be carried out in the same procedure as in S40.

[0149] Next, in S42, a base ink layer 21 may be formed on all or at least part of the outer surface of the coating layer 4. The base ink layer 21 may be printed using an oil-based ink composition containing pigment ink or an aqueous ink composition. The formation of the base ink layer 21 may be carried out by the same procedure as in the first modified example.

[0150] After forming the base ink layer 21, the process proceeds to step S50. By additionally performing steps S41 and S42, the packaging container 300 shown in the embodiment of Figure 6 can be obtained.

[0151] [Fifth variation] In this embodiment, the case in which corona treatment is not performed on the printing substrate 1 has been described, but Figure 16 shows the step of performing corona treatment on all or at least a part of the printing substrate 1 before proceeding to step S20. Corona treatment may be performed on the printing substrate 1 in S10. Corona treatment is a process that modifies the surface of the printing substrate 1 by introducing hydrophilic functional groups to the surface of the printing substrate 1 through corona discharge irradiation. By performing corona treatment on the printing substrate 1, the printing substrate 1 can be made to have excellent adhesion to the anchor layer 2, and the wettability and adhesion of the ink composition and the like can be improved.

[0152] In the first modified example, if corona treatment is performed on the printing substrate 1, corona treatment may be performed on all or at least a portion of the printing substrate 1 before proceeding to step S15.

[0153] Corona treatment can be performed by known methods. For example, corona treatment may involve irradiating a rolled printing substrate 1 with a corona discharge oscillated from a high-frequency power supply. The corona discharge output may be 10 W / cm or more and 80 W / cm or more. After corona treatment, proceed to step S20.

[0154] Corona treatment of the printing substrate 1 improves the adhesion between the printing substrate 1 and the anchor layer 2 and / or the aqueous ink layer 3. Furthermore, corona treatment of the printing substrate 1 reduces the repulsion of the ink composition of the aqueous ink layer 3, allowing the packaging container 300 to have an image with superior quality. [Sixth variation] In this embodiment, the case in which only one coating layer 4 is formed has been described, but Figure 17 shows the step of forming an additional coating layer 42 before proceeding to step S60. In S55, the additional coating layer 42 may be formed so as to cover all or at least part of the printing substrate 1 or the coating layer 4. The step of forming the additional coating layer 42 in S55 may be carried out in the same manner as in S40.

[0155] The additional coating layer 42 may be formed after the coating layer 4 has been completely formed. The additional coating layer 42 may also be formed without completely curing the resin components contained in the coating layer 4. By additionally performing step S55, the packaging container 300 shown in the embodiment of Figure 9 can be obtained.

[0156] Figure 18 shows an example of the manufacturing flow for the packaging container 300 of this embodiment. The packaging container 300 of this embodiment can be formed by the steps of laminating a printing substrate 1 and a packaging support part 100 to form a laminate 400, and forming a printed part 200 including the printing substrate 1 and an aqueous ink layer 3.

[0157] The printing unit 200 may include the step of inkjet printing an aqueous ink composition onto the printing substrate 1 of the laminate 400 to form an aqueous ink layer 3, thereby forming a printing unit 200 including the printing substrate 1 and the aqueous ink layer 3.

[0158] The packaging container 300 may be manufactured by performing the processes S50', S30', S60', and S70' shown in Figure 18. For the sake of explanation, the processes S50', S30', S60', and S70' will be described in order, but at least some of these processes may be performed in parallel, or the steps may be rearranged without departing from the spirit of the present invention.

[0159] First, in S50', the printing substrate 1 and the packaging support part 100 are laminated to form a laminate 400. The printing substrate 1 may be bonded to one surface of the packaging support part 100 to form the laminate 400. The descriptions of each layer can be applied as already described.

[0160] If the packaging container 300 is a pouch or retort pouch, the packaging support part 100 and the printing substrate 1 may each be long films, and the laminate 400 may be formed by lamination using an adhesive, for example, in a roll-to-roll manner. The description of the adhesive can be applied as already described. The laminate 400 may be wound into a roll and used as a base material for pouches.

[0161] Next, in S30', an aqueous ink layer 3 is formed on the printing substrate 1 of the laminate 400. The aqueous ink layer 3 may be formed by inkjet printing of an aqueous ink composition. The aqueous ink composition may be inkjet printed so as to cover all or at least a portion of the printing substrate 1.

[0162] The aqueous ink composition may be cured by heating, drying, hot air treatment, or electron beam irradiation. This forms a printed portion 200 including a printing substrate 1 and an aqueous ink layer 3. The laminate 400 on which the printed portion 200 is formed is used to form a packaging container 300. After forming the packaging container 300, the process proceeds to S60'. Unless otherwise specified, the descriptions of each layer may be as previously described.

[0163] The laminate 400 on which the printed portion 200 is formed may be used as a component for forming the packaging container 300. For example, it may be used as a lid or sealing material to seal the packaging container 300.

[0164] Next, in S60', the packaging container 300 is inspected. The inspection procedure may be as described above. For example, the inspection may check whether there are any dents or holes on the outer or inner surface of the packaging container 300. For example, the inspection may check whether the printed image of the water-based ink layer 3 is clear. For example, the inspection may check whether there are any blisters in the printed image of the water-based ink layer 3. For example, the inspection may check whether there are any stains or scratches on the outer surface of the packaging container 300.

[0165] Next, in S70', the contents are filled into the inspected packaging container 300. The packaging container 300 filled with contents is then sealed. The filling and sealing may be carried out by known methods. Alternatively, the filled and sealed packaging container 300 may be subjected to retort processing.

[0166] In recent years, the printing design of pouches has become increasingly important, and the demand for small-lot, multi-variety pouches has been growing. In the manufacturing flow of this embodiment, the laminate 400 formed in step S50' can be used as the base material before the formation of the water-based ink layer 3, so a common base material can be formed for multi-variety packaging containers 300 with different text, images, etc.

[0167] In general, during the step of laminating the printing substrate 1 and the packaging support part 100, the production line is adjusted until the film supplied at the start of production reaches a stable quality. As a result, films that do not meet the required quality standards may be removed from the production line and discarded. In particular, in conventional methods for manufacturing packaging containers 300, the production flow is carried out on separate production lines for each product type, resulting in the discarding of a predetermined amount of film for each product type. Therefore, in small-lot, multi-product production flows, the utilization rate of materials such as film decreases.

[0168] On the other hand, the manufacturing flow of this embodiment allows for the formation of a common raw material even when manufacturing multiple types of packaging containers 300. This enables the steps up to S50' in the manufacturing flow of packaging containers 300 to be carried out on a common manufacturing line for multiple types of products.

[0169] For example, let's assume that 300m of film material is discarded for each production line to make adjustments. In this case, if we apply the conventional manufacturing method for packaging containers 300 and produce three types of packaging containers 300, a total of 900m of material will be discarded. On the other hand, by applying the manufacturing flow of this embodiment, even when producing three types of packaging containers 300, the amount of material discarded can be reduced to a total of 300m.

[0170] This prevents the loss of film materials and other components compared to manufacturing different raw materials for each lot or variety. Therefore, by applying the manufacturing flow of this embodiment, the production efficiency of the packaging container 300 can be significantly improved.

[0171] Furthermore, in conventional manufacturing methods for packaging containers 300, where each product type is manufactured on a separate production line, the packaging container 300 is manufactured after receiving an order for the product, followed by plate-making work for forming the printed image, printing, lamination, adhesive curing, and bag making. In particular, the curing of the adhesive requires a long aging period, and an aging period of 3 to 7 days may be applied.

[0172] Therefore, conventional manufacturing methods for packaging containers 300 require a long period of time from order placement to delivery. In addition, managing the manufacturing process of packaging containers 300 requires complex inventory management that takes into account the time required for the manufacturing flow and delivery dates.

[0173] In the manufacturing flow of this embodiment, the laminate 400 can be stored after the printing substrate 1 and the packaging support part 100 are bonded in step S50', until the adhesive hardens or partially hardens before the printing part 200 is formed. Therefore, after receiving an order for the packaging container 300, there is no need to perform the printing process and the bag-making process, and then harden the adhesive. As a result, by applying the manufacturing flow of this embodiment, the time required from order to delivery of the packaging container 300 can be significantly shortened.

[0174] Next, a modified version of this embodiment is shown. A packaging container 300 may be manufactured by combining at least some of the configurations of the modified versions shown below.

[0175] [Seventh variation] In this embodiment, the case in which the anchor layer 2 and the coating layer 4 are not formed on the printing substrate 1 has been described. However, Figure 19 shows the steps of forming the anchor layer 2 on the printing substrate 1 of the laminate 400 and forming the coating layer 4 on the aqueous ink layer 3 formed in step S30', before proceeding to step S30'.

[0176] Before proceeding to step S30', an anchor layer 2 may be formed on the printing substrate 1 of the laminate 400 in S20'. The anchor layer 2 may be formed by applying and curing an anchor composition to all or at least a portion of the printing substrate 1. The anchor composition may contain a first resin component and a solvent that dissolves the first resin component.

[0177] The anchor composition may further contain titanium dioxide. By including titanium dioxide in the anchor composition, the excellent whiteness of titanium dioxide makes it possible to omit the formation of the base ink layer 21 described later.

[0178] After forming the anchor layer 2 on the printing substrate 1, the process proceeds to step S30'. At this point, step S30' is the step of forming the aqueous ink layer 3 on the anchor layer 2. The aqueous ink layer 3 may be formed by inkjet printing the aqueous ink composition onto the anchor layer 2. The aqueous ink composition may be inkjet printed so as to cover all or at least a portion of the area of ​​the anchor layer 2.

[0179] Next, in S40', a coating layer 4 may be formed on the aqueous ink layer 3. The coating layer 4 may be formed by directly or indirectly applying a coating composition to the aqueous ink layer 3 and curing it. The coating composition may be applied so as to cover all or at least part of the aqueous ink layer 3. The coating composition comprises a second resin component, a curing component, and a solvent. The coating composition may be cured by heating, drying, hot air treatment, or electron beam irradiation. This forms a printed portion 200 including the printing substrate 1, anchor layer 2, aqueous ink layer 3, and coating layer 4.

[0180] The packaging container 300 is formed from the laminate 400 on which the printed section 200 is formed. After forming the packaging container 300, the process proceeds to S60'. By performing the steps shown in Figure 19, the packaging container 300 shown in the embodiment of Figure 3 can be obtained. Unless otherwise specified, the descriptions of each layer may be as previously described.

[0181] [Eighth variation] In this embodiment, the case in which no base ink layer 21 is formed is described, but Figure 20 shows the step of forming the base ink layer 21 on the surface of the printing substrate 1 opposite to the surface on which the aqueous ink layer 3 is formed, before proceeding to step S50'. In S15', the base ink layer 21 may be formed to cover all or at least part of the printing substrate 1. The base ink layer 21 may be printed using an oil-based ink composition containing pigment ink or an aqueous ink composition. The formation of the base ink layer 21 may be carried out by the same procedure as in the first modified example.

[0182] After forming the undercoat ink layer 21 on the printing substrate 1, the process proceeds to step S50'. By additionally performing step S15', the packaging container 300 shown in the embodiment of Figure 10 can be obtained.

[0183] [Ninth variation] In this embodiment, a case in which no base ink layer 21 is formed is described, but Figure 21 shows the step of forming the base ink layer 21 on the printing substrate 1 of the laminate 400 before proceeding to step S30'. In S55', printing may be performed using an oil-based ink composition containing pigment ink or an aqueous ink composition so as to cover all or at least part of the printing substrate 1 of the laminate 400. The formation of the base ink layer 21 may be carried out by the same procedure as in the first modified example. After forming the base ink layer 21 on the printing substrate 1, proceed to step S30'.

[0184] In the seventh modification, before proceeding to step S20', a base ink layer 21 may be formed on the printing substrate 1 of the laminate 400. In this case, step S20' becomes a step of forming an anchor layer 2 on at least one of the printing substrate 1 and the base ink layer 21. In the seventh modification, by additionally performing step S55', the packaging container 300 shown in the embodiment of Figure 7 can be obtained.

[0185] [Tenth variation] In the seventh modification, a case in which the base ink layer 21 is not formed is described, but Figure 22 shows the step of forming the base ink layer 21 on the anchor layer 2 before proceeding to step S30' of the seventh modification. In S25', printing may be performed using an oil-based ink composition containing pigment ink or an aqueous ink composition so as to cover all or at least part of the anchor layer 2. The formation of the base ink layer 21 may be carried out by the same procedure as in the first modification.

[0186] After forming the base ink layer 21, the process proceeds to step S30'. The aqueous ink layer 3 may be provided so as to cover all or at least a portion of the base ink layer 21. By additionally performing step S25', the packaging container 300 shown in the embodiment of Figure 8 can be obtained.

[0187] [Eleventh variation] In this embodiment, the case in which corona treatment is not performed on the printing substrate 1 has been described, but Figure 23 shows the step of performing corona treatment on all or at least a part of the printing substrate 1 before proceeding to step S30'. Corona treatment may be performed on the printing substrate 1 in S10'. The explanation of corona treatment can be applied as already described. In the seventh modification, corona treatment may be performed on the printing substrate 1 before proceeding to step S20'.

[0188] Corona treatment of the printing substrate 1 improves the adhesion between the printing substrate 1 and the anchor layer 2 and / or the aqueous ink layer 3. Furthermore, corona treatment of the printing substrate 1 reduces the repulsion of the ink composition of the aqueous ink layer 3, allowing the packaging container 300 to have an image with superior quality.

[0189] [Twelfth variation] In the seventh modified example, the case in which only one coat layer 4 is formed is described, but Figure 24 shows the step of forming an additional coat layer 42 before proceeding to step S60'. In S45', the additional coat layer 42 is formed so as to cover all or at least part of the printing substrate 1 or the coat layer 4. The step of forming the additional coat layer 42 in S45' may be carried out in the same procedure as in S40'.

[0190] The additional coating layer 42 may be formed after the coating layer 4 has been completely formed. The additional coating layer 42 may also be formed without completely curing the resin components contained in the coating layer 4. By additionally performing step S45', the packaging container 300 shown in the embodiment of Figure 9 can be obtained. [Examples]

[0191] The following describes the experimental method and results for specifically examining the relationship between the resin component of the coating layer 4 in the printing section 200 and the print quality of the aqueous ink layer 3 after retort processing. Note that the experimental method described below is just one example, and the experimental method is not limited to the examples provided.

[0192] [Example 1] [Manufacturing of printing unit 200] A PET film (manufactured by Toyobo Co., Ltd., 12 μm thick) that had undergone corona treatment was used as the printing substrate 1. An anchor layer 2, an aqueous ink layer 3, and a coating layer 4 were formed on the printing substrate 1 in this order to manufacture the printed section 200.

[0193] The anchor composition for forming anchor layer 2 used acrylic resin as the first resin component. The amount of acrylic resin was 10 parts by weight per 100 parts by weight of the anchor composition. A mixed solvent of water and alcohol was used as the solvent. After coating the entire surface of the PET film with the anchor composition, it was dried at 130°C for 1 minute. The thickness of the anchor layer 2 obtained after drying was 0.3 μm.

[0194] A commercially available aqueous ink composition was used to form the aqueous ink layer 3. The aqueous ink composition contained inks printed with black, cyan, red, and yellow pigments, and an acrylic resin as the resin component. The aqueous ink composition contained 5 parts by weight of pigment and 5 parts by weight of resin component per 100 parts by weight of aqueous ink composition. The aqueous ink composition did not contain any organic solvents. The aqueous ink composition was applied to the anchor layer 2 by direct inkjet printing to form a solid pattern, and then dried at 130°C for 1 minute. The thickness of the aqueous ink layer 3 obtained after drying was 1 μm.

[0195] The coating composition used to form the coating layer 4 contained polyurethane resin as the second resin component and isocyanate resin as a curing component for curing the first resin component. The amount of polyurethane resin was 30 parts by weight per 100 parts by weight of the coating composition. The amount of isocyanate resin was 3 parts by weight per 100 parts by weight of the coating composition. Methyl ethyl ketone was used as the solvent. After applying the coating composition to the entire surface of the aqueous ink layer 3, it was dried at 130°C for 1 minute. The thickness of the coating layer 4 obtained after drying was 2 μm.

[0196] [Retort processing] The printing section 200 was treated at 121°C for 40 minutes. A retort processing device manufactured by Naigai Facilities Industry Co., Ltd. was used.

[0197] [Criteria for evaluating print image quality] The print quality of the water-based ink layer 3 after retort processing was visually assessed. The results are shown in Table 1. Blistering is a phenomenon in which the water-based ink layer becomes dotted with white spots. ○: The printed image was very clear, and no blister packaging was formed. △: There was some slight blurring in the outlines of the printed image, but the printed image was still clearly recognizable. ×: The printed image is unclear or has a blister pack.

[0198] [Example 2] The printed portion 200 was manufactured in the same manner as in Example 1, except that epoxy resin was used as the second resin component in the coating composition for forming the coating layer 4. The amount of epoxy resin was 40 parts by weight per 100 parts by weight of the coating composition. The thickness of the coating layer 4 obtained after drying was 2 μm.

[0199] [Comparative Example 1] The printed section 200 was manufactured in the same manner as in Example 1, except that the coating layer 4 was not formed.

[0200] [Table 1]

[0201] As shown in the results in Table 1, by forming a coating layer 4 containing a resin component on top of the aqueous ink layer 3, no peeling of the layer was observed even after retort processing, no blisters were formed on the aqueous ink layer 3, and a printed section 200 with excellent image quality was provided.

[0202] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiments. It will be clear from the claims that such modified or improved forms may also be included in the technical scope of the present invention.

[0203] It should be noted that the execution order of operations, procedures, steps, and stages in the packaging containers and methods shown in the claims, specifications, and drawings is not explicitly stated as "before" or "in advance," and that the operations can be performed in any order unless the packaging container from a previous operation is used in a later operation. Even if the operation flow in the claims, specifications, and drawings is described using phrases such as "first," "next," etc. for convenience, it does not mean that it is essential to perform the operations in that order. [Explanation of symbols]

[0204] 1 Printing base material 2 Anchor layer 3. Water-based ink layer 4 Coat Layers 21 Undercoat ink layer 42 Additional Coat Layers 100 Packaging support section 200 Printing Department 211 Undercoat 1st Ink Layer 212 Undercoat, second ink layer 213 Undercoat, 3rd Ink Layer 300 Packaging containers 400-layer structure

Claims

1. The process involves applying an anchor composition containing a first resin component onto a printing substrate and curing it to form an anchor layer, The steps include: forming an aqueous ink layer by inkjet printing an aqueous ink composition onto the anchor layer; A coating composition containing a second resin component and a curing component for curing the first resin component is applied directly or indirectly to the aqueous ink layer, and this is cured to form a coating layer. This involves the step of forming a printed portion including the printing substrate, the anchor layer, the aqueous ink layer, and the coating layer, The steps include providing the printing section on one surface of the packaging support section, Equipped with, (A) The first resin component includes a polyurethane resin, and the curing component includes an isocyanate resin, (B) The first resin component includes an epoxy resin, and the curing component includes an amino resin or an isocyanate resin, (C) The first resin component comprises an acrylic resin, and the curing component comprises an acrylic resin having oxazoline or isocyanate, (D) A method for manufacturing a packaging container, wherein the first resin component comprises a polyester resin and the curing component comprises an isocyanate resin.

2. In the step of providing the printed portion on one surface of the packaging support portion, the surface of the printed portion opposite to the printing substrate is bonded to the surface of the packaging support portion. A method for manufacturing a packaging container according to claim 1.

3. The step of forming the printed section is: The step is to form a base ink layer on the aqueous ink layer or the coating layer to form a printed portion including the printing substrate, the anchor layer, the aqueous ink layer, the coating layer, and the base ink layer. A method for manufacturing a packaging container according to claim 2.

4. The process involves applying an anchor composition containing a first resin component onto a printing substrate and curing it to form an anchor layer, The steps include: forming an aqueous ink layer by inkjet printing an aqueous ink composition onto the anchor layer; A coating composition containing a second resin component and a curing component for curing the first resin component is applied directly or indirectly to the aqueous ink layer, and this is cured to form a coating layer. This involves the step of forming a printed portion including the printing substrate, the anchor layer, the aqueous ink layer, and the coating layer, The steps include providing the printing section on one surface of the packaging support section, Equipped with, In the step of providing the printed portion on one surface of the packaging support portion, the printed portion is bonded to the surface of the packaging support portion, A method for manufacturing packaging containers.

5. Before the step of forming the anchor layer, The process further comprises the step of forming a base ink layer on the printing substrate, The step of forming the anchor layer is to form the anchor layer on at least one of the printing substrate and the base ink layer, The printed portion includes the printing substrate, the undercoat ink layer, the anchor layer, the aqueous ink layer, and the coating layer. A method for manufacturing a packaging container according to claim 4.

6. The step of forming the printed section is: The step is to form a base ink layer on the anchor layer to form a printed portion including the printing substrate, the anchor layer, the base ink layer, the aqueous ink layer, and the coating layer. A method for manufacturing a packaging container according to claim 4.

7. The steps include laminating a printing substrate and a packaging support part to form a laminate, A water-based ink composition is inkjet printed onto the printing substrate of the laminate to form a water-based ink layer. This includes the step of forming a printed portion including the printing substrate and the aqueous ink layer, A method for manufacturing a packaging container, comprising the following features.

8. Before the step of forming the laminate, The method for manufacturing a packaging container according to claim 7, further comprising the step of forming a base ink layer on the surface of the printing substrate opposite to the surface on which the aqueous ink layer is formed.

9. Before the step of forming the aqueous ink layer, The process further comprises the step of applying an anchor composition containing a first resin component onto the printed substrate of the laminate and curing it to form an anchor layer. The step of forming the aqueous ink layer is to form the aqueous ink layer by inkjet printing the aqueous ink composition onto the anchor layer. The step of forming the printed section is: The step involves applying a coating composition containing a second resin component and a curing component for curing the first resin component directly or indirectly to the aqueous ink layer, curing it to form a coating layer, and thereby forming a printed portion including the printing substrate, the anchor layer, the aqueous ink layer, and the coating layer. A method for manufacturing a packaging container according to claim 7 or 8.

10. (A) The first resin component includes a polyurethane resin, and the curing component includes an isocyanate resin, (B) The first resin component includes an epoxy resin, and the curing component includes an amino resin or an isocyanate resin, (C) The first resin component comprises an acrylic resin, and the curing component comprises an acrylic resin having oxazoline or isocyanate, (D) The first resin component comprises a polyester resin, and the curing component comprises an isocyanate resin. A method for manufacturing a packaging container according to claim 9.

11. Before the step of forming the anchor layer, The step of forming a base ink layer on the printing substrate of the laminate is further included. The step of forming the anchor layer is to form the anchor layer on at least one of the printing substrate and the base ink layer, The printed portion includes the printing substrate, the undercoat ink layer, the anchor layer, the aqueous ink layer, and the coating layer. A method for manufacturing a packaging container according to claim 9 or claim 10, which does not directly or indirectly refer to claim 8.

12. The step of forming the printed section is: The step is to form a base ink layer on the anchor layer to form a printed portion including the printing substrate, the anchor layer, the base ink layer, the aqueous ink layer, and the coating layer. A method for manufacturing a packaging container according to claim 9 or claim 10, which does not directly or indirectly refer to claim 8.

13. A method for manufacturing a packaging container according to any one of claims 1 to 12, further comprising the step of applying corona treatment to the printing substrate before performing the steps of forming the anchor layer, forming the base ink layer, or forming the aqueous ink layer on the printing substrate.

14. A method for manufacturing a packaging container according to any one of claims 9 to 11, 13, which directly or indirectly references any of claims 3, 5, 6, 8, 11, and 12, wherein the base ink layer is a layer containing pigment ink.

15. The aforementioned laminate is a raw material for pouches. A method for manufacturing a packaging container according to claim 7 and any one of claims 8 to 14 that directly or indirectly reference claim 7.

16. The aforementioned packaging support portion is made of a single layer of film or a laminate of films. The aforementioned packaging container is a pouch. A method for manufacturing a packaging container according to any one of claims 1 to 15.

17. The aforementioned packaging support section is made of laminated film, The aforementioned packaging container is a retort pouch. A method for manufacturing a packaging container according to any one of claims 1 to 15.

18. The aforementioned packaging support section is made of laminated film, At least one of the laminated films includes a metal foil. A method for manufacturing a packaging container according to any one of claims 1 to 17.

19. The process involves applying an anchor composition containing a first resin component onto a printing substrate and curing it to form an anchor layer, The steps include: forming an aqueous ink layer by inkjet printing an aqueous ink composition onto the anchor layer; A coating composition containing a second resin component and a curing component for curing the first resin component is applied directly or indirectly to the aqueous ink layer, and this is cured to form a coating layer. This involves the step of forming a printed portion including the printing substrate, the anchor layer, the aqueous ink layer, and the coating layer, The steps include providing the printing section on one surface of the packaging support section, Equipped with, The aforementioned packaging support part is a can body, The packaging container is a can. A method for manufacturing packaging containers.

20. The surface free energy of the aqueous ink layer, calculated by the Kaelble-Uy method, is 30 mJ / m³ at a temperature of 25°C. ２ 70mJ / m or more ２ The method for manufacturing a packaging container according to any one of claims 1 to 19, as follows:

21. Packaging support section and A printing section is provided on one side of the packaging support section, A packaging container equipped with, The aforementioned printing unit is Printing substrate and An anchor layer is provided on the printed substrate and formed by curing the first resin component, The aqueous ink layer applied to the anchor layer, A coating layer that protects the aqueous ink layer, It has, The coating layer is formed by curing a second resin component and contains at least a curing component that cures the first resin component. (A) The first resin component includes a polyurethane resin, and the curing component includes an isocyanate resin, (B) The first resin component includes an epoxy resin, and the curing component includes an amino resin or an isocyanate resin, (C) The first resin component comprises an acrylic resin, and the curing component comprises an acrylic resin having an oxazoline or isocyanate resin, or (D) The first resin component comprises a polyester resin, and the curing component comprises an isocyanate resin. packaging container.

22. Of the printing portion, the side opposite to the printing substrate is provided on one side of the packaging support portion. The packaging container according to claim 21.

23. The aforementioned printing unit is The following further includes a base ink layer provided on the aqueous ink layer or the coating layer: The packaging container according to claim 22.

24. Packaging support section and A printing section is provided on one side of the packaging support section, A packaging container equipped with, The aforementioned printing unit is Printing substrate and An anchor layer is provided on the printed substrate and formed by curing the first resin component, The aqueous ink layer applied to the anchor layer, A coating layer that protects the aqueous ink layer, It has, The coating layer is formed by curing a second resin component and contains at least a curing component that cures the first resin component. Of the printing portion, the printing substrate side is provided on one surface of the packaging support portion. packaging container.

25. The aforementioned printing unit is The printing substrate further includes a base ink layer provided on the printing substrate, The packaging container according to claim 24.

26. The aforementioned printing unit is The anchor layer further includes a base ink layer provided on the anchor layer, The packaging container according to claim 24.

27. The printing substrate has a base ink layer on the side opposite to the side on which the aqueous ink layer is provided. The packaging container according to claim 24.

28. The curing component further hardens the aqueous ink layer. A packaging container according to any one of claims 21 to 27.

29. Packaging support section and A printing section is provided on one side of the packaging support section, A packaging container equipped with, The aforementioned printing unit is Printing substrate and A water-based ink layer coated on the aforementioned printing substrate, It has, Of the printing portion, the printing substrate side is provided on one surface of the packaging support portion. The printing portion further has a base ink layer on the side of the printing substrate opposite to the side on which the aqueous ink layer is provided. packaging container.

30. The aforementioned base ink layer is a layer containing pigment ink. A packaging container according to any one of claims 23, 25 to 27 and 29, and claim 28, which directly or indirectly references any one of claims 23, 25 to 27.

31. The aforementioned packaging support portion is made of a single layer of film or a laminate of films. The aforementioned packaging container is a pouch. A packaging container according to any one of claims 21 to 30.

32. The aforementioned packaging support section is made of laminated film, The aforementioned packaging container is a retort pouch. A packaging container according to any one of claims 21 to 30.

33. The aforementioned packaging support section is made of laminated film, At least one of the laminated films includes a metal foil. A packaging container according to any one of claims 21 to 32.

34. Packaging support section and A printing section is provided on one side of the packaging support section, A packaging container equipped with, The aforementioned printing unit is Printing substrate and An anchor layer is provided on the printed substrate and formed by curing the first resin component, The aqueous ink layer applied to the anchor layer, A coating layer that protects the aqueous ink layer, It has, The coating layer is formed by curing a second resin component and contains at least a curing component that cures the first resin component. The aforementioned packaging support part is a can body, The aforementioned packaging container is a can container. packaging container.

35. The surface free energy of the aqueous ink layer, calculated by the Kaelble-Uy method, is 30 mJ / m³ at a temperature of 25°C. ２ 70mJ / m or more ２ The following is: A packaging container according to any one of claims 21 to 34.

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