Container and manufacturing method of container

Abstract

To propose a container capable of printing and small production while reducing disposal of laminate raw fabric, and to propose a manufacturing method of the container.SOLUTION: Provided is a container 100 according to the present disclosure in which a trunk part 1a for forming a storage space S of a content has a laminated structure of sheets of a plurality of materials. The laminated structure has a structure in which an outer side layer 20a as a single layer subjected to printing on an inner side face and forming an outermost layer of the trunk part 1a, and an inner side multilayer 20b constituted of a plurality of different layers and provided with a heat seal layer (inner side seal layer 11) on the inner side face are bonded to each other.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a container capable of dispensing contents by pressing a body portion, and a method for manufacturing the container. [Background technology]

[0002] For example, in the case of containers that are filled with cosmetics or the like and from which the contents can be poured out by pressing the body of the container, there is a demand for the body to be printed to enhance its aesthetic appearance or to convey information.

[0003] For example, Patent Document 1 discloses a tube container in which the outside of the PET resin layer constituting the body is decorated by gravure printing and the inside is provided with a metal vapor deposition film to improve aesthetic appeal. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-19493 A Summary of the Invention [Problem to be solved by the invention]

[0005] By the way, although the gravure printing used in manufacturing the above-mentioned tube containers is suitable for mass production, it is not suitable for small-scale production to meet the diversification of tastes. Therefore, flexographic printing or the like has been used instead of gravure printing to meet the small-scale production of containers. However, when producing containers in small quantities, the frequency of adjustments to the number of production, such as alignment of the laminated sheet with the printing machine and color matching of the printing, increases, so that a large amount of almost completed laminate raw material is sometimes discarded, and there is still room for improvement in this respect.

[0006] The present disclosure aims to solve these problems, and its objective is to propose a container that allows printing and small-scale production while reducing waste of laminated raw material, and a method for manufacturing the container. [Means for solving the problem]

[0007] The container of the present disclosure comprises: [1] A container having a body portion forming a storage space for contents and having a laminated structure made of sheets of multiple materials, The laminate structure is a single-layer outer layer forming the outermost layer of the body and having a printing applied to an inner surface thereof; It is made up of several different layers and has an inner multi-layer with a heat seal layer on the inner surface. The present invention is characterized in that it has a structure in which the above-mentioned are bonded together.

[0008] The container of the present disclosure further comprises: [2] In the configuration described in [1] above, it is preferable to have a reinforcing tape portion provided along a butted portion where circumferential ends of the laminated sheets forming the body portion are butted against each other.

[0009] The container of the present disclosure further comprises: [3] In the configuration described in [1] or [2] above, it is preferable that the inner multi-layer has a layer having a higher reflectance for visible light than the other layers.

[0010] The container of the present disclosure further comprises: [4] In any of the configurations described in [1] to [3] above, it is preferable that the tube container has a cylindrical tube body formed from a sheet, a resin head provided at one end of the tube body and having a shoulder portion and a mouth portion protruding from the shoulder portion, and a bottom portion provided at the other end of the tube body.

[0011] The method for manufacturing a container according to the present disclosure further comprises the steps of: [5] A method for manufacturing a container having a body portion that forms a storage space for contents and has a laminated structure made of sheets of multiple materials, comprising the steps of: forming a single-layer outer layer having a printed surface; forming an inner multi-layer made of a plurality of different types of resins and having a heat seal layer on an inner surface; laminating the outer layer and the inner multi-layer together such that the outer layer is an outermost layer and the heat seal layer of the inner multi-layer is an innermost layer to form a laminate sheet; joining circumferential ends of the cut laminated sheet together; The present invention is characterized by comprising: Effect of the Invention

[0012] According to the present disclosure, it is possible to propose a container that allows printing and small-scale production while reducing waste of laminated raw material, and a method for manufacturing the container. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a front view of a container after content filling and bottom sealing according to one embodiment of the present disclosure. [Diagram 2] FIG. 2 is a front cross-sectional view of a container body constituting a container according to one embodiment of the present disclosure. [Diagram 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] FIG. 2 is a diagram showing a layer structure of a body portion of a container according to an embodiment of the present disclosure. [Diagram 5] 1 is a flowchart showing a procedure for carrying out a container manufacturing method according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is a diagram showing the layer structure of the body in the container examples and comparative examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present disclosure will now be described more specifically with reference to the drawings.

[0015] FIG. 1 is a front view showing the configuration of a container 100 after filling with contents, which is an embodiment of the present disclosure. The container 100 includes a container body 1 that forms a storage space S (see FIG. 2) for the contents, a pouring cap 2 that is attached to a mouth portion 42 (see FIG. 2) of the container body 1, and a lid body 3 that closes a pouring hole of the pouring cap 2. In this specification, claims, abstract, and drawings, the side where the lid body 3 is located is referred to as the upper side (upper side in FIG. 1), and the side where the container body 1 is located is referred to as the lower side (lower side in FIG. 1). In addition, in the description of the layer structure of the container body 1, the storage space S side is referred to as the inside, and the outer peripheral surface side of the container body 1 is referred to as the outside. In addition, the rotation direction around the central axis (not shown) of the container 100 is referred to as the circumferential direction.

[0016] In the present embodiment, the term "single layer" refers to a layer having only one layer, excluding adhesive layers such as dry laminate layers used for adhesion to other layers, vapor deposition films, and printed layers. The single layer may be made of a single material such as a polyester resin or an olefin resin, or may be made of a blend material as long as it has only one layer.

[0017] In the present embodiment, the term "different layers" refers to two or more layers made of different materials.

[0018] First, the container body 1 will be described. As shown in Figures 1 and 2, the container body 1 has a body 1a that forms a storage space S for the contents and is pressed to pour out the contents, a mouth 42 that opens upward and to which a pouring cap 2 is attached, and a bottom 1b that closes the lower end of the body 1a. The container body 1 can be manufactured, for example, by combining a tube body 30 and a head 40 as shown in Figure 2.

[0019] The tube body 30 can be formed into a substantially cylindrical shape by, for example, rolling a laminated sheet 31 having a laminated structure cut into a strip shape so that both circumferential side ends 31a, 31b are butted together at a butt joint 32, attaching a reinforcing tape portion 35 to the inner surface along the butt joint 32 (see FIG. 3), and fusing both cross sections of both side ends 31a, 31b by means of high frequency sealing, heat sealing, or the like so as not to expose them. In this embodiment, the tube body 30 is substantially cylindrical, but it may be of any shape as long as it is cylindrical, and may be of a substantially elliptical cylindrical shape, for example.

[0020] In this embodiment, the head 40 has a shoulder portion 41 formed in a truncated cone shape. The head 40 can be provided integrally with the tube body 30, for example, by welding the outer peripheral edge of the shoulder portion 41 to the upper end of the tube body 30 over the entire circumference. The head 40 can also be formed integrally with the tube body 30 by loading the above-mentioned tube body 30 together with the material of the head 40 into a mold and performing compression molding.

[0021] A cylindrical mouth 42 is provided to protrude upward from the center of the shoulder 41. The tip of the mouth 42 is an opening 42a that leads to the storage space S for the contents. An annular protrusion 42b for attaching the spouting cap 2 to the mouth 42 is provided on the outer circumferential surface of the mouth 42.

[0022] The contents are filled into the storage space S through the open end at the bottom of the tube body 30 having such an approximately cylindrical shape, and then the open end is flattened and closed by means of heat sealing or the like to form the bottom 1b, thereby forming a container body 1 filled with the contents.

[0023] In this embodiment, the body 1a of the container body 1 has a layer structure shown in Fig. 4. That is, the body 1a of the container body 1 includes, in order from the inside on the storage space S side, an inner seal layer 11, an extruded polyethylene (PE) layer 14, a polyolefin resin layer 15 made of a polyethylene (PE) film, an extruded polyethylene (PE) layer 16, a high reflection layer 19 obtained by depositing aluminum on the inside of a PET film, a dry laminate adhesive layer 27, a low density polyethylene layer 21, a UV laminate adhesive layer 29, and a printed layer 23 obtained by flexographic printing on the inside of a PET film. Note that the portions of the container body 1 other than the body 1a may have the same layer structure as the body 1a, or may have a structure in which some layers are omitted or some layers are added.

[0024] The highly reflective layer 19 is formed by forming an aluminum vapor deposition film on one side (inner surface) of a base material made of a polyethylene terephthalate (PET) film, and is configured to have a higher reflectance for visible light than other layers constituting the laminated sheet 31. In this embodiment, the aluminum vapor deposition film is formed on one side of the base material having a small surface roughness, so that the surface roughness is similarly small and the scattering of incident light is small, and therefore a high light reflectance can be obtained despite the thin wall. In this embodiment, the thickness of the base material is about 12 μm, and the thickness of the aluminum vapor deposition film is about 100 nm. The thickness of the aluminum vapor deposition film is preferably 50 nm or more in order to obtain a high reflectance. Note that instead of the aluminum vapor deposition film, a configuration may be made in which a vapor deposition film of another metal such as gold, silver, platinum, zinc, or nickel is formed. In addition, in this embodiment, the barrier property and light blocking property can also be improved by providing the highly reflective layer 19 on the trunk portion 1a.

[0025] In this embodiment, an aluminum vapor deposition film is applied to the inner surface of the base material to ensure high light reflectance and brilliance of the container body 1. Note that various resin films other than polyethylene terephthalate (PET) film may be used for the base material as long as it is transparent and the surface roughness of the metal vapor deposition film can be kept small.

[0026] In this embodiment, as shown in Fig. 4, the highly reflective layer 19 is adhered to the inner surface of the low-density polyethylene layer 21 by a dry laminate (DL) adhesive layer 27. The dry laminate adhesive layer 27 is an adhesive layer for applying an adhesive to one of the films before lamination, drying the film, and then bonding the film to the other film by pressure bonding.

[0027] In this embodiment, the low density polyethylene layer 21 has a thickness of about 60 μm. The low density polyethylene layer 21 is adhered to the outer surface of the highly reflective layer 19 by a dry lamination adhesive layer 27.

[0028] The inner seal layer 11 is made of linear low density polyethylene (LLDPE) having flexibility, transparency, resistance to contents, and sealing properties. In this embodiment, the thickness of the inner seal layer 11 is about 80 μm. The inner seal layer 11 is bonded to the polyolefin resin layer 15 with the extruded polyethylene layer 14 as an adhesive layer. In this embodiment, the thickness of the extruded polyethylene layer 14 is about 30 μm.

[0029] The laminate of the above-mentioned high reflection layer 19 and low density polyethylene layer 21 has an anchor coat (AC) layer 25 applied to the inner surface thereof to increase adhesive strength, and is bonded to the polyolefin resin layer 15 using the extruded polyethylene layer 16 as an adhesive layer. In this embodiment, the thickness of the extruded polyethylene layer 16 is about 30 μm.

[0030] In this embodiment, the polyolefin resin layer 15 is a film member formed of polyethylene (PE). For example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or high density polyethylene resin (HDPE) can be used as the polyethylene used for the polyolefin resin layer 15. In particular, when LLDPE is used, high squeezability can be imparted to the body 1a of the container body 1. The thickness of the polyolefin resin layer 15 is preferably in the range of 60 μm to 200 μm from the viewpoint of ensuring the flexibility and restorability of the body 1a of the container body 1. In this embodiment, the thickness of the polyolefin resin layer 15 is about 150 μm. In this way, by forming the thickness of the polyolefin resin layer 15 to be larger than the thickness of the highly reflective layer 19, the restorability of the body 1a can be ensured. The configuration of the polyolefin resin layer 15 is not limited to the above embodiment, and polypropylene, which is a polyolefin resin other than polyethylene, may be used. In addition, various resins other than polyolefin resin may be used.

[0031] As described above, in this embodiment, the layers from the low-density polyethylene layer 21 to the inner seal layer 11 in FIG. 4 are formed first and prepared as a roll of the inner multi-layer 20b.

[0032] On the other hand, the outer layer 20a has a printing layer 23 formed by flexographic printing on one surface (inner surface) of a base material (thickness 12 μm) made of polyethylene terephthalate (PET). The printing layer 23 forms the outermost layer of the laminated sheet 31 and is configured as a single layer formed of a single material (PET in this embodiment). The base material used for the printing layer 23 is not limited to PET, and may be other synthetic resins such as oriented polypropylene (OPP) (thickness 20 μm). The thickness of the base material is also not limited to the above and can be arbitrarily selected from the viewpoints of the flexibility and recovery required for the laminated sheet 31, the manufacturing conditions, the manufacturing equipment, and the like.

[0033] A UV lamination adhesive layer 29 is provided on the inner side of the printed layer 23 in the outer layer 20a before bonding with the inner multi-layer 20b. The UV lamination adhesive layer 29 is provided to bond the outer layer 20a made of the printed layer 23 to the outside of the inner multi-layer 20b. Instead of the UV lamination adhesive layer 29, a dry laminate (DL) adhesive layer may be provided.

[0034] In this embodiment, the outer layer 20a, which has a UV laminate adhesive layer 29 provided on the inside of the printed layer 23 in advance, is bonded to the inner seal layer 11, the extruded polyethylene (PE) layer 14, the polyolefin resin layer 15, the extruded polyethylene (PE) layer 16, the high reflection layer 19, the dry laminate adhesive layer 27, and the inner multi-layer 20b, which has the low density polyethylene layer 21, to obtain a roll-shaped laminated sheet 31. With this configuration, even if the frequency of adjustments such as alignment and color matching of the outer layer 20a with the printer increases due to small-scale production, only the printed layer 23 used for adjustments needs to be discarded, and there is no need to discard the inner multi-layer 20b side. Therefore, the ratio of the amount of material wasted to the number of productions due to small-scale production can be reduced.

[0035] Next, the pouring cap 2 will be described. The pouring cap 2 has a pouring hole for pouring out the contents in the storage space S of the container body 1 to the outside, and is attached to the annular protrusion 42b of the mouth part 42 of the container body 1 by undercut engagement. In addition, a lid body 3 that covers the pouring hole is provided above the pouring cap 2. The lid body 3 is integrally formed with the pouring cap 2 by a hinge (not shown), and the pouring hole can be opened or closed by rotating the lid body 3 around the hinge. The attachment of the pouring cap 2 to the container body 1 is not limited to the above-mentioned undercut engagement, and may be configured to be attached by threading the pouring cap 2 into a male screw part formed in the mouth part 42 of the container body 1.

[0036] When pouring the contents from the container 100 configured as described above, the cover 3 is rotated around the hinge to open the pouring hole, and then the container 100 is changed in position so that the pouring hole faces the application area, and the body 1a is pressed (squeezed). This increases the pressure in the storage space S of the container body 1, and the contents are poured out from the pouring hole to the outside.

[0037] After the required amount of contents is poured out, the pressure on the body 1a is released. This causes the pressure in the storage space S to return to the outside air pressure, and the body 1a of the container body 1 returns to its original shape due to its own restoring force. The body 1a of the container body 1 has a polyolefin resin layer 15 that is thicker than the highly reflective layer 19 for improving high light reflectance, glitter, barrier properties, and light blocking properties. Therefore, when the pressure on the body 1a is released, the body 1a returns to its original shape before pressing due to its excellent restoring ability against deformation caused by the material properties.

[0038] In the present embodiment, the container 100 is described assuming a tube container as its configuration, but is not limited to this. The container 100 may be, for example, a pouch container.

[0039] Next, a method for manufacturing the container 100 according to this embodiment will be described with reference to FIG.

[0040] When manufacturing the container 100, first, flexographic printing is performed on the inner surface of a PET base material to form the printed layer 23 of the outer layer 20a. When bonding the outer layer 20a to the inner multi-layer 20b, a UV laminate adhesive layer 29 is provided on one surface (inner surface) of the printed layer 23. This forms the outer layer 20a (step S101 in FIG. 5).

[0041] On the other hand, a roll-shaped inner multi-layer 20b having an inner seal layer 11, an extruded polyethylene (PE) layer 14, a polyolefin resin layer 15, an extruded polyethylene (PE) layer 16, a high reflection layer 19, a dry laminate adhesive layer 27, and a low density polyethylene layer 21 is formed in this order from the inside (step S102 in FIG. 5). The inner multi-layer 20b can be formed, for example, by (1) adhering the inner seal layer 11 to the polyolefin resin layer 15 using the extruded polyethylene layer 14 as an adhesive layer, (2) adhering the high reflection layer 19 to the inner surface of the low density polyethylene layer 21 using the dry laminate (DL) adhesive layer 27, and (3) applying an anchor coat (AC) layer 25 to the inner surface of the laminate of the high reflection layer 19 and the low density polyethylene layer 21 to increase adhesive strength, and adhering the extruded polyethylene layer 16 to the polyolefin resin layer 15 as an adhesive layer.

[0042] Next, the inner multi-layer 20b is attached to the inside of the outer layer 20a to form the laminated sheet 31 (step S103 in FIG. 5). The outer layer 20a and the inner multi-layer 20b can be bonded to each other via a UV laminate adhesive layer 29 applied to the inner surface of the printing layer 23 immediately before bonding.

[0043] Next, the laminated sheet 31 is cut to a size corresponding to the container 100, and ends in the circumferential direction, which is the direction around the central axis of the container 100, are butted together (step S104 in FIG. 5). Then, a reinforcing tape portion 35 is attached from the inside so as to straddle the butted portion 32 in the circumferential direction (see FIGS. 2 and 3) and along the butted portion 32 in the central axis direction, thereby welding the butted portion 32. This forms a substantially cylindrical tube main body 30 (step S105 in FIG. 5).

[0044] Next, the head 40 is attached to one end (the upper end in FIG. 2) of the tube body 30 (step S106 in FIG. 5). The head 40 can be attached to the tube body 30, for example, by welding the outer peripheral edge of the shoulder portion 41 of the head 40 to the upper end of the tube body 30 around the entire circumference.

[0045] After the contents are filled from below into the storage space S inside the tube body 30, the storage space S is sealed by forming a bottom 1b at the lower end of the tube body 30. The bottom 1b can be formed, for example, by flattening the lower end of the tube body 30 and welding the inner surfaces of the inner seal layer 11, which is the innermost layer of the laminated sheet 31, together.

[0046] As described above, the container 100 according to this embodiment is a container 100 in which the body 1a forming the storage space S for the contents has a laminated structure made of sheets of multiple materials, and the laminated structure is configured to have a structure in which the outer layer 20a, which forms the outermost layer of the body 1a and is printed on the inner surface, and the inner multi-layer 20b, which is composed of multiple different layers and has a heat seal layer (inner seal layer 11) on the inner surface, are bonded together. By adopting such a configuration, even if the frequency of adjustments such as alignment and color matching of the outer layer 20a with the printer increases due to small-scale production, only the printed layer 23 used for adjustments needs to be discarded, and there is no need to discard each layer on the inner multi-layer 20b side. Therefore, the ratio of the amount of material discarded to the number of productions due to small-scale production can be reduced. In addition, since the inner surface of the printed layer 23 of the outer layer 20a is printed, the printed surface is less likely to be affected even if the outer surface of the container 100 is scratched or stained. Therefore, it is easy to maintain the aesthetic appearance of the container 100.

[0047] In this embodiment, the laminated sheet 31 forming the body 1a is configured to have a reinforcing tape portion 35 provided along the butt joint portion 32 where the circumferential ends of the laminated sheet 31 are butted together. By adopting such a configuration, the circumferential ends of the laminated sheet 31 can be bonded in a butted state by welding the heat seal layer (inner seal layer 11) which is the innermost layer of the laminated sheet 31 to the reinforcing tape portion 35. Therefore, it is not necessary to bond the circumferential ends of the laminated sheet 31 in a circumferentially overlapping manner. Therefore, the container 100 can be stably formed regardless of the adhesiveness of the outer surface of the outer layer 20a.

[0048] In this embodiment, the inner multi-layer 20b is configured to have a layer (highly reflective layer 19) that has a higher reflectance to visible light than the other layers. By adopting such a configuration, in addition to the decoration by the printed layer 23, high light reflectance can be provided, so that the aesthetic appearance of the container 100 can be further improved.

[0049] In this embodiment, the tube container is configured to have a cylindrical tube body 30 formed from a sheet, a resin head 40 provided at one end of the tube body 30 and having a shoulder portion 41 and a mouth portion 42 protruding from the shoulder portion 41, and a bottom portion 1b provided at the other end of the tube body 30. By adopting such a configuration, it is possible to provide tube containers suitable for small-scale production in response to a variety of tastes.

[0050] In addition, the present embodiment is a method for manufacturing a container 100 in which the body 1a forming the storage space S for the contents has a laminated structure made of sheets of multiple materials, and includes forming a single-layer outer layer 20a printed on one side, forming an inner multi-layer 20b made of multiple different types of resin and provided with a heat seal layer (inner seal layer 11) on the inner side, bonding the outer layer 20a and the inner multi-layer 20b together to form a laminated sheet 31 so that the outer layer 20a is the outermost layer and the heat seal layer of the inner multi-layer 20b is the innermost layer, and joining the circumferential ends of the cut laminated sheet 31 together. By adopting such a configuration, even if the frequency of adjustments such as alignment and color matching of the outer layer 20a with respect to the printing machine increases due to small-scale production, only the printed layer 23 used for the adjustments needs to be discarded, and there is no need to discard each layer on the inner multi-layer 20b side. Therefore, the ratio of the amount of material wasted to the number of productions due to small-scale production can be reduced. In addition, since printing is performed on the inner surface of the printed layer 23 of the outer layer 20a, the printed surface is less likely to be affected even if the outer surface of the container 100 is scratched or stained. Therefore, the aesthetic appearance of the container 100 can be easily maintained.

[0051] Although the present disclosure has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these modifications and corrections are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to cause logical inconsistency, and multiple components can be combined into one or divided. It should be understood that these are also included in the scope of the present invention.

[0052] For example, in the present embodiment, flexographic printing is performed on the inner surface of the printing layer 23, but the present invention is not limited to this embodiment. Printing methods other than flexographic printing may also be used. EXAMPLES

[0053] Next, three different layer configurations were prepared for the body 1a of the container 100 shown in Fig. 1, as shown in Fig. 6, and each layer configuration was evaluated for small-lot production adaptability, productivity, and print peeling (see Table 1). Of the three layer configurations, Fig. 6 shows an example of the container 100 of the present disclosure at the top, and comparative examples 1 and 2 from the second row onwards.

[0054] The example has the same layer structure as the embodiment of the present disclosure shown in Figure 4, and includes, from the inside on the storage space side, an inner sealing layer (LLDPE: 80 μm), an extruded polyethylene (PE) layer: 30 μm, a polyolefin resin layer made of polyethylene (PE) film: 150 μm, an extruded polyethylene (PE) layer: 30 μm, a highly reflective layer formed by vapor-depositing aluminum on the inner surface of a 12 μm PET film, a dry laminate adhesive layer (DL), a low-density polyethylene layer (LDPE: 60 μm), a UV laminate adhesive layer, and a printed layer formed by flexographic printing on the inner surface of a 12 μm PET film.

[0055] In comparison with the above-mentioned examples, Comparative Example 1 is a laminated sheet in which an outer sealing layer (LDPE: 60 μm) is the outermost layer, and a PET resin layer with gravure printing applied to the inner surface of a PET film: 12 μm is arranged instead of a printed layer.

[0056] In comparison with the examples, in Comparative Example 2, a PET film: 12 μm is placed instead of a low-density polyethylene layer (LDPE: 60 μm), and a layer (LDPE: 60 μm) with flexographic printing applied to the outer surface is placed on the outer surface of the PET film: 12 μm instead of a printed layer.

[0057] In the examples, flexographic printing is applied to the inner surface of the printed layer, and then it is bonded to the inner outer sealing layer (LDPE: 60 μm), whereas in the comparative example 2, flexographic printing is applied to the outermost surface after all layers are formed.

[0058] Table 1 shows the results of evaluation of the Example and Comparative Examples 1 and 2 with respect to adaptability to small-lot production, productivity, and print peeling.

[0059] [Table 1]

[0060] The evaluation results are shown in Table 1. With regard to suitability for small-lot production, the Example and Comparative Example 2, which used flexographic printing, were rated "good" and "fair," respectively, whereas Comparative Example 1, which used gravure printing, was rated "not good." This is because flexographic printing uses plates made of rubber or resin, and thus has low initial costs, whereas gravure printing uses wide metal plates and requires time and effort for adjustment, resulting in high initial costs and making it unsuitable for small-lot production.

[0061] Next, in terms of productivity, the examples and comparative example 1 are rated as "good", whereas the comparative example 2 is rated as "not good". This is because in the examples, only the printed layer is formed separately from the other layers and is finally bonded to the other layers, so that even if the frequency of adjustments such as alignment and color matching of the printed layer with respect to the printer increases, only the printed layer used for the adjustments needs to be discarded, and there is no need to discard the other layers. Therefore, the amount of material waste can be reduced. In comparative example 1, too, only the PET resin layer with gravure printing applied to the inner surface and the outer seal layer (LDPE) are formed separately from the other layers and are finally bonded to the other layers, so that even if the frequency of adjustments such as alignment and color matching with respect to the printer increases, there is no need to discard the layers other than the PET resin layer and the outer seal layer. Therefore, it can be said that the examples and comparative example 1 have excellent productivity.

[0062] In contrast, in Comparative Example 2, after all layers are formed, flexographic printing is performed on the outer surface of the outermost layer. Therefore, if the frequency of adjustments such as alignment and color matching for the printing machine increases, the laminate raw roll of almost all layers that was used for adjustment may have to be discarded. In this respect, Comparative Example 2 cannot be said to be excellent in productivity.

[0063] Next, regarding print peeling, in the example and comparative example 1, the print is printed on the inside surface and the printed surface is not exposed on the outside, so there is no print peeling and it is rated as "good." In contrast, in comparative example 2, the print is printed on the outer surface of the outermost layer, so there is a concern about print peeling, and it is rated as "fair."

[0064] As described above, in this embodiment, the printing layer for the inner surface printing by flexographic printing is formed separately from the other layers, and is then bonded to the other layers after printing, which allows for small-lot production while minimizing waste of materials, resulting in excellent productivity. In addition, there is no risk of the print peeling off due to the inner surface printing. [Industrial Applicability]

[0065] According to the present disclosure, it is possible to propose a container 100 that allows printing and small-scale production while reducing waste of laminate material, and a method for manufacturing the container 100. [Explanation of symbols]

[0066] 1 Container body 1a Torso 1b bottom 2. Dispensing cap 3 Lid 11 Inner seal layer (heat seal layer) 14 Extruded Polyethylene (PE) Layer 15 Polyolefin resin layer 16 Extruded Polyethylene (PE) Layer 19 High reflective layer 20a outer layer 20b Inner multi-layer 21 Low density polyethylene layer 23 Printing layer 25 Anchor coat (AC) layer 27 Dry Laminate Adhesive Layer 29 UV lamination adhesive layer 30 Tube body 31 Laminated Sheet 31a,31b side edge 32 Butt joint 35 Reinforcement tape section 40 Head 41 Shoulder 42 Mouth 42a aperture 42b Annular protrusion 100 containers S Storage space

Claims

1. A container having a body portion forming a storage space for contents and having a laminated structure made of sheets of multiple materials, The laminate structure is a single-layer outer layer forming the outermost layer of the body and having a printing applied to an inner surface thereof; It is made up of several different layers and has an inner multi-layer with a heat seal layer on the inner surface. A container having a structure in which the above are bonded together.

2. 2. The container according to claim 1, further comprising a reinforcing tape portion provided along a butted portion where circumferential ends of the laminated sheets forming the body portion are butted against each other.

3. 3. The container of claim 1 or 2, wherein the inner multi-layer has a layer that is more reflective to visible light than the other layers.

4. 3. The container according to claim 1 or 2, which is a tube container having a cylindrical tube body formed from a sheet, a resin head provided at one end of the tube body and having a shoulder portion and a mouth portion protruding from the shoulder portion, and a bottom portion provided at the other end of the tube body.

5. A method for manufacturing a container having a body portion that forms a storage space for contents and has a laminated structure made of sheets of multiple materials, comprising the steps of: forming a single-layer outer layer having a printed surface; forming an inner multi-layer made of a plurality of different types of resins and having a heat seal layer on an inner surface; laminating the outer layer and the inner multi-layer together such that the outer layer is an outermost layer and the heat seal layer of the inner multi-layer is an innermost layer to form a laminate sheet; joining circumferential ends of the cut laminated sheet together; A method for manufacturing a container comprising:

Images