Tube container

Abstract

To provide a tube container which has a shading property, a gas barrier property and metallic gloss, and is improved in recyclability.SOLUTION: In a tube container 100 in which a barrel 1a forming a storage space S of a content has a laminated structure made of a plurality of materials, the laminated structure comprises a shading layer 15 for suppressing the transmission of light, a high reflection layer 17 which is disposed outside the shading layer 15 and has a metal vapor deposition film formed on at least one surface of a base material, a barrier layer 21 for suppressing the passage of gas, and an outermost layer and an innermost layer made of resin of the same kind as that of the shading layer 15.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a tube container from which the contents can be dispensed by pressing the body. [Background technology]

[0002] Tube containers, which are filled with cosmetics, toothpaste, medicines, seasonings, etc. and from which the contents can be dispensed by pressing the body of the container, are required to have excellent light-blocking properties against external light, as well as gas barrier properties and moisture barrier properties, in order to prevent deterioration of the contents.

[0003] For example, Patent Document 1 discloses a tube container provided with a barrier layer having a metal foil and a highly reflective layer having a metal vapor deposition film. [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] However, the tube container described in Patent Document 1 has a barrier layer having a metal foil as an intermediate layer. Therefore, in the tube container having a polyethylene-based resin in the outermost and innermost layers, the weight ratio of the metal foil, which is a different material from the polyethylene-based resin, is high, so there is still room for improvement in terms of the recyclability of the tube container.

[0006] The present disclosure aims to solve these problems, and its purpose is to propose a tube container that has light-blocking properties, barrier properties, and a metallic luster, as well as improved recyclability. [Means for solving the problem]

[0007] The tube container of the present disclosure comprises: A tube container in which the body of the container body forming the storage space for the contents has a laminated structure made of multiple materials, The laminated structure includes a light-shielding layer that suppresses light transmission, a highly reflective layer that is provided on the outside of the light-shielding layer and has a metal vapor deposition film formed on at least one surface of a base material, and a barrier layer that suppresses gas transmission. Most an outer layer and an innermost layer, the light-shielding layer, the outermost layer, and the innermost layer are formed of a polyethylene resin, The laminated structure is characterized in that the light-shielding layer, the highly reflective layer, and the barrier layer are arranged in this order from the inside.

[0009] In the tube container of the present disclosure having the above-described configuration, the metal vapor deposition film is preferably an aluminum vapor deposition film.

[0011] In addition, in the above-described configuration, the tube container of the present disclosure may further comprise, among the materials constituting the container body, Polyethylene The weight percentage of materials other than resin is preferably less than 6 weight percent.

[0012] In the tube container of the present disclosure having the above-described configuration, the light-shielding layer preferably has white, black, and white polyethylene resins in this order from the outside. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to propose a tube container that has light-blocking properties, barrier properties, and a metallic luster, and also has improved recyclability. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a front view of a tube container according to one embodiment of the present disclosure. [Figure 2] FIG. 2 is a front cross-sectional view of a container body constituting a tube container according to one embodiment of the present disclosure. [Figure 3]FIG. 2 is a diagram showing a layer structure of a body portion of a tube container according to an embodiment of the present disclosure. [Figure 4] FIG. 2 is a diagram showing the layer structure of the body of the tube container in Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present disclosure will be described in more detail below with reference to the drawings.

[0016] FIG. 1 is a front view showing the configuration of a tube container 100 according to one embodiment of the present disclosure. The tube container 100 includes a container body 1 that forms a storage space S (see FIG. 2) for the contents, a dispensing cap 2 that is attached to an opening 42 (see FIG. 2) of the container body 1, and a lid 3 that closes the dispensing hole of the dispensing cap 2. In this specification, claims, abstract, and drawings, the side on which the lid 3 is located is referred to as the upper side (upper side in FIG. 1), and the side on which the bottom 1b of the container body 1 is located is referred to as the lower side (lower side in FIG. 1). In addition, in describing the layer structure of the container body 1, the side on which the storage space S is located is referred to as the inside, and the side on the outer circumferential surface of the container body 1 is referred to as the outside.

[0017] First, we will explain the container body 1. 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 that is pressed to dispense the contents, a mouth 42 that opens upward and to which a dispensing cap 2 is attached, and a bottom 1b that closes the lower end of the body 1a. The container body 1 can be manufactured by, for example, combining a tube body 30 and a head 40 as shown in Figure 2.

[0018] The tube body 30 can be formed into a substantially cylindrical shape by, for example, rolling a laminate sheet 31 having a laminated structure formed in a strip shape so that both side ends 31a, 31b slightly overlap in the circumferential direction at the overlap portion 32, and then welding the both side ends 31a, 31b at the overlap portion 32 while compressing them using means such as high-frequency sealing or heat sealing so that both cross sections of the both side ends 31a, 31b are not exposed. Low-density polyethylene resin is then extruded using an extruder to cover the entire body portion 1a, and the tube body 30 is cut to a predetermined length to form the tube body 30. Note that in FIG. 2, the low-density polyethylene resin layer (the outer extruded coating layer described below) is not depicted in order to illustrate the overlap portion 32. In this embodiment, the tube body 30 is substantially cylindrical, but it may also be formed into a substantially elliptical cylindrical shape, for example.

[0019] In this embodiment, the head 40 has a shoulder 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 41 to the upper end of the tube body 30 along the entire circumference. The head 40 can also be formed integrally with the tube body 30 by placing the above-mentioned tube body 30 together with the material for the head 40 in a mold and performing compression molding.

[0020] A cylindrical mouth 42 is provided to protrude upward from the center of the shoulder 41. The tip of the mouth 42 forms an opening 42a that leads to the storage space S for the contents. An annular protrusion 42b is provided on the outer circumferential surface of the mouth 42 for attaching the pouring cap 2 to the mouth 42.

[0021] 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 container body 1 can be constructed by closing the open end by means of heat sealing or the like to form the bottom 1b.

[0022] In this embodiment, the body 1a of the container body 1 has a layer structure shown in Fig. 3. That is, the body 1a of the container body 1 includes, in order from the inside, which is the side of the storage space S, an inner seal layer 11, an extruded polyethylene (PE) resin layer 13, a light-shielding layer 15, a dry laminate (DL) adhesive layer 25, a high-reflection layer 17 formed by vapor-depositing aluminum on the outside of an oriented polypropylene (OPP) film, an extruded polyethylene (PE) resin layer 19, a barrier layer 21 having a three-layer structure of linear low-density polyethylene (LLDPE) / ethylene-vinyl alcohol copolymer (EVOH) / LLDPE, and an outer extruded coating layer 23. Note that portions of the container body 1 other than the body 1a (such as the head 40) 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, for example, a single layer made of polyethylene (PE) resin or the like.

[0023] The inner sealing layer 11 is made of linear low density polyethylene (LLDPE) which has flexibility, resistance to contents, and sealing properties. In this embodiment, the thickness of the inner sealing layer 11 is about 80 μm.

[0024] A light-shielding layer 15 is adhered to the outer surface of the inner sealing layer 11 using an extruded polyethylene resin layer 13 as an adhesive layer. In this embodiment, the thickness of the light-shielding layer 15 is approximately 30 μm.

[0025] As shown in FIG. 3, the light-shielding layer 15 is a resin layer having white, black, and white polyethylene resin layers from the outside. The light-shielding layer 15 mainly reflects visible light incident from the outside by the outer white polyethylene resin layer. Furthermore, light that passes through the outer white polyethylene resin layer is absorbed by the black polyethylene resin layer provided in the middle. In this way, the light-shielding layer 15 can prevent the contents in the storage space S from being exposed to light incident from the outside.

[0026] The total thickness of the light-shielding layer 15 may be changed depending on the level of light-shielding property required for the contents, and the proportion of the black polyethylene resin layer may be changed as appropriate.

[0027] The highly reflective layer 17 is an aluminum vapor-deposited film formed on one surface (outer surface) of a base material made of OPP film, which has excellent heat resistance. In this embodiment, the aluminum vapor-deposited film is formed on one surface of the base material, which also has a small surface roughness, and therefore the surface roughness is similarly small and there is little scattering of incident light, thereby achieving high light reflectance (glossiness) despite the thin thickness. In this embodiment, the thickness of the base material is approximately 25 μm, and the thickness of the aluminum vapor-deposited film is approximately 50 nm. The thickness of the aluminum vapor-deposited film is preferably 10 nm or more to achieve high reflectance (metal-like gloss). Note that instead of the aluminum vapor-deposited film, a vapor-deposited film of another metal, such as gold, silver, platinum, zinc, or nickel, may be formed.

[0028] In this embodiment, OPP resin is used as the base material of the high-reflection layer 17, and although OPP resin is a different material from the polyethylene-based resin that constitutes the inner sealing layer 11 and the outer extruded coating layer 23, it is the same polyolefin-based resin. Therefore, by using OPP resin as the base material of the high-reflection layer 17, the recyclability of the container body 1 can be further improved.

[0029] In this embodiment, an aluminum vapor deposition film is applied to the outer surface of the base material to ensure the metallic luster of the container body 1 and improve its barrier properties. The aluminum vapor deposition film may be provided on the inner surface of the base material, or may be formed on both surfaces of the base material. Furthermore, various resin films other than OPP film may be used for the base material, as long as they have sufficient performance to allow the formation of a metal vapor deposition film.

[0030] In this embodiment, as shown in Fig. 3, the highly reflective layer 17 is adhered to the outer surface of the light-shielding layer 15 by a dry laminate (DL) adhesive layer 25. The dry laminate adhesive layer 25 is an adhesive layer that is applied to one of the films before lamination, dried, and then bonded to the other film by pressure bonding.

[0031] An anchor coat (AC) layer 17a is applied to the outer surface of the highly reflective layer 17. The highly reflective layer 17 is bonded to the barrier layer 21, which is a laminate, using an extruded polyethylene resin layer 19 as an adhesive layer. In this embodiment, the thickness of the extruded polyethylene resin layer 19 can be, for example, about 15 μm.

[0032] 3, the barrier layer 21 has a three-layer structure of a linear low-density polyethylene (LLDPE) resin layer 21a, an ethylene-vinyl alcohol copolymer (EVOH) resin layer 21b, and an LLDPE resin layer 21c. For example, the thicknesses of the LLDPE resin layers 21a and 21c can be approximately 37 μm, and the thickness of the EVOH resin layer 21b can be approximately 6 μm.

[0033] By providing the barrier layer 21 with the EVOH resin layer 21b, the barrier properties against the permeation of gases such as oxygen can be improved, and oxidation of the contents can be suppressed.

[0034] Here, the EVOH resin layer 21b is preferably formed from EVOH having an ethylene content of 29 to 44 mol%. By forming the EVOH resin layer 21b from EVOH having an ethylene content of 29 to 44 mol%, it is possible to ensure appropriate oxygen barrier performance while preventing cracks and the like from occurring in the EVOH resin layer 21b when the contents are squeezed out. In contrast, if the EVOH resin layer 21b is formed from EVOH having an ethylene content of less than 29 mol%, cracks and the like may occur in the EVOH resin layer 21b when the contents are squeezed out. Furthermore, if the EVOH resin layer 21b is formed from EVOH having an ethylene content of more than 44 mol%, the oxygen barrier performance may be insufficient.

[0035] In addition, instead of the EVOH resin layer 21b, the barrier layer 21 may be made of, for example, a nylon resin layer having gas barrier properties.

[0036] The outer extruded covering layer 23 is made of an extruded low-density polyethylene (LDPE) resin that is flexible, transparent, and capable of being decorated by printing or the like. In this embodiment, the thickness of the outer extruded covering layer 23 can be approximately 200 μm. The outer extruded covering layer 23 can be extruded onto the outside of the barrier layer 21 in a sheet-like laminated structure. Alternatively, for example, the outer extruded covering layer 23 can be formed by overlapping and sealing both circumferential ends of a laminated structure in which layers from the inner seal layer 11 to the outer barrier layer 21 in FIG. 3 are laminated, forming a cylindrical body, and then extruding the outer extruded covering layer 23 over the entire outer peripheral surface of the cylindrical body (in this case, the side end 31 a in FIG. 2 is covered by the outer extruded covering layer 23 and is therefore indicated by a dashed line). The outer surface of the outer extruded covering layer 23 may be subjected to, for example, decorative silkscreen printing, offset printing, or coating.

[0037] As described above, the outer extrusion coating layer 23 and the inner seal layer 11 are formed from an LDPE-based resin to impart high squeezability to the barrel portion 1a of the container body 1, but this is not limited to this embodiment. For example, the outer extrusion coating layer 23 and the inner seal layer 11 may be made of a high-density polyethylene resin (HDPE). Furthermore, the configuration of the outer extrusion coating layer 23 and the inner seal layer 11 is not limited to the above embodiment, and polypropylene-based resins, which are polyolefin resins other than polyethylene-based resins, may also be used. Furthermore, various resins other than polyolefin resins may also be used.

[0038] Next, the dispensing cap 2 will be described. The dispensing cap 2 has a dispensing hole for dispensing the contents in the storage space S of the container body 1 to the outside, and is attached by undercut engagement to the annular protrusion 42b of the mouth 42 of the container body 1. A lid 3 that covers the dispensing hole is provided above the dispensing cap 2. The lid 3 is formed integrally with the dispensing cap 2 by a hinge (not shown), and the dispensing hole can be opened or closed by rotating the lid 3 about the hinge. Note that the attachment of the dispensing cap 2 to the container body 1 is not limited to the undercut engagement described above, and the dispensing cap 2 may also be attached by threaded engagement with a male thread formed in the mouth 42 of the container body 1, for example.

[0039] In this embodiment, the pouring cap 2 and the lid body 3 are made of polypropylene resin, but can be removed from the container body 1 after use. Furthermore, in the layer structure of the body 1a shown in FIG. 3, approximately 93% by weight is made of polyethylene-based resin. The head 40 is also made of polyethylene-based resin. Due to these structures, the proportion of polyethylene-based resin used in the container body 1 exceeds 95% by weight. Therefore, when recycling, the tube body 1 can be recycled as a single material made of polyethylene-based resin. Furthermore, in this embodiment, polypropylene resin is used for the pouring cap 2 and the lid body 3 to ensure the required performance as a cap, but if they are made of polyethylene resin, recyclability can be further improved.

[0040] In addition, the resin layers made of polyethylene-based resin in Figure 3 are, from the inside, an inner sealing layer 11, an extruded polyethylene (PE) resin layer 13, a light-shielding layer 15, an extruded polyethylene (PE) resin layer 19, a linear low-density polyethylene (LLDPE) resin layer 21a, an LLDPE resin layer 21c, and an outer extruded coating layer 23.

[0041] To dispense the contents from the tube container 100 configured as described above, the lid 3 is rotated around the hinge to open the dispensing hole, and then the tube container 100 is changed in position so that the dispensing hole faces the application area, and the body 1a is pressed (squeezed). This increases the pressure within the storage space S of the container body 1, and the contents are dispensed to the outside through the dispensing hole.

[0042] After the required amount of contents has been dispensed, the pressure on the body 1a is released. This causes the pressure inside 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. As shown in Figure 3, 90% or more of the body 1a of the container body 1 is made of polyethylene resin. Therefore, when the pressure on the body 1a is released, the body 1a returns to its original shape before pressing due to the excellent restoring ability against deformation caused by the material properties of polyethylene resin.

[0043] As described above, the tube container 100 according to this embodiment has a body portion 1a that forms the storage space S for the contents and has a laminated structure made of multiple materials. The laminated structure includes a light-shielding layer 15 that suppresses light transmission, a highly reflective layer 17 that is disposed outside the light-shielding layer 15 and has a metal-deposited film formed on at least one surface of a base material, a barrier layer 21 that suppresses gas transmission, and an outermost layer and an innermost layer made of the same resin as the light-shielding layer 15. This configuration enhances the light-shielding properties of the container body 1 with the light-shielding layer 15, enhances the glossiness of the container body 1 with the highly reflective layer 17, and enhances the oxygen and moisture barrier properties of the container body 1 with the barrier layer 21. Furthermore, by forming the light-shielding layer 15 and the outermost and innermost layers from the same resin, the recyclability of the container body 1 can be improved. The light-shielding layer 15 preferably suppresses transmission of ultraviolet light in addition to visible light, thereby suppressing deterioration of the contents and the container.

[0044] In this embodiment, the laminated structure is configured so that the light-shielding layer 15, the highly reflective layer 17, and the barrier layer 21 are arranged in this order from the inside. By adopting such a configuration, the glossiness of the container body 1 can be increased by the light reflected by the highly reflective layer 17 without being affected by the light-shielding layer 15. Furthermore, since the transparent barrier layer 21 is arranged on the outside of the highly reflective layer 17, the metal vapor deposition film can be protected without impairing the glossiness.

[0045] In this embodiment, the metal vapor deposition film is configured to be an aluminum vapor deposition film. By adopting such a configuration, an aluminum vapor deposition film that is highly suitable for mass production can be used for the tube container 100, making it possible to provide an inexpensive tube container 100 that is suitable for mass production. Furthermore, by using oriented polypropylene resin (OPP) as the base material for the aluminum vapor deposition film, problems with recyclability can be reduced because OPP is an olefin-based resin similar to polyethylene-based resins.

[0046] In this embodiment, the outermost and innermost layers of the laminated structure are formed from a polyethylene resin. By adopting such a configuration, when the body portion 1a of the container body 1 is pressed to dispense the contents and then released, the body portion 1a can return to its original shape before pressing due to the excellent restoring ability against deformation caused by the material properties of the polyethylene resin.

[0047] In this embodiment, the weight percentage of materials other than the same type of polyolefin resin among the materials constituting the container body 1 is set to be less than 6 weight percent. By adopting such a configuration, the container body 1 can be handled as being made essentially of a single material, thereby improving the recyclability of the container body 1.

[0048] In this embodiment, the light-shielding layer 15 is configured to have white, black, and white polyethylene-based resin layers in that order from the outside. By adopting such a configuration, incident light from the outside is reflected by the outer white polyethylene-based resin layer, and the light that has passed through the white polyethylene-based resin layer is absorbed by the black polyethylene-based resin layer provided in the middle, thereby preventing the contents in the storage space S from being exposed to light incident from the outside.

[0049] Although the present disclosure has been described based on various drawings and examples, it should be noted that those skilled in the art can easily make various modifications and alterations based on the present disclosure. Therefore, it should be noted that these modifications and alterations 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 inconsistencies, and multiple components can be combined into one or divided. It should be understood that these modifications and alterations are also included in the scope of the present invention.

[0050] For example, in this embodiment, an extruded LDPE resin layer is used for the outer extruded covering layer 23 (outermost layer) of the laminated structure, but in this case, decoration may be applied to the outer surface of the outer extruded covering layer 23 by offset printing, coating, hot stamping, etc. In this case, too, the offset printing, coating, or hot stamping is not considered to be a resin layer, and the outer extruded covering layer 23 becomes the outermost layer.

[0051] The thickness of each resin layer constituting the tube container 100 of this embodiment described above is merely an example, and can be changed as desired within a range in which each resin layer can fulfill its function. [Example]

[0052] Next, four different layer configurations were prepared for the body 1a of the tube container 100 shown in Fig. 1, as shown in Fig. 4, and each layer configuration was evaluated for gloss, oxygen barrier property, moisture barrier property, light blocking property, and weight ratio of different materials (recyclability) (see Table 1). In Fig. 4, of the four layer configurations, an example of the tube container 100 of the present disclosure is shown on the top row, and comparative examples 1 to 3 are shown in the second row and onwards. In each tube container, the maximum diameter of the container body 1 was 19 mm, and the container height (the heightwise distance from the upper end of the lid 3 to the lower end of the bottom 1b of the container body 1 in Fig. 1) was 65 mm.

[0053] The example has the same layer structure as the embodiment of the present disclosure shown in Figure 3, and includes, from the inside on the storage space side, an inner sealing layer (LLDPE: 80 μm), an extruded polyethylene (PE) layer: 15 μm, a light-shielding layer (light-shielding PE resin layer), a dry laminate (DL) adhesive layer, a highly reflective layer (AL vapor deposition + OPP resin layer), an extruded polyethylene (PE) layer: 15 μm, a barrier layer (LLDPE 37 μm / EVOH 6 μm / LLDPE 37 μm), and an outer extruded coating layer (extruded LDPE resin layer: 200 μm).

[0054] In Comparative Example 1, as shown in FIG. 4, an aluminum foil of 12 μm thick is provided instead of the high-reflection layer, barrier layer, and light-shielding layer of the above-mentioned Examples.

[0055] In Comparative Example 2, a 30 μm EVOH resin layer was provided instead of the barrier layer, unlike in the Examples, and no resin layers corresponding to the light-shielding layer and the highly reflective layer in the Examples were provided.

[0056] Comparative Example 3 was composed of only a 400 μm thick LDPE resin layer, and no resin layers corresponding to the light-shielding layer, the highly reflective layer, and the barrier layer in the Examples were provided.

[0057] Table 1 shows the evaluation results of the examples and comparative examples 1 to 3 in terms of gloss, oxygen barrier property [cc / day / pkg], moisture barrier property, light blocking property, and weight ratio of different materials (recyclability).

[0058] The glossiness in Table 1 was evaluated by visual inspection based on the presence or absence of metallic gloss.

[0059] The oxygen barrier properties (oxygen transmission rate) [cc / day / pkg] in Table 1 are the amount of oxygen [cc] that permeates into the container from outside the container per day, measured using a MOCON oxygen transmission rate measuring device (OX-TRAN2 / 20) under the following conditions: atmosphere outside the container: air (O2: 21%), temperature outside the container: 23°C, relative humidity outside the container: 55%, atmosphere inside the container: N2, temperature inside the container: 23°C, relative humidity inside the container: 90%. An oxygen barrier property of less than 0.03 [cc / day / pkg] is the standard for oxygen barrier properties required to prevent deterioration of the contents.

[0060] The moisture barrier properties (moisture permeability) in Table 1 were measured by filling the storage space S with water at a storage temperature of 40° C. and measuring the weight change rate [%] of the water in the storage space S after 4 weeks.

[0061] The light-blocking property (light transmittance) [%] in Table 1 indicates the maximum transmittance in the wavelength range of 200 nm to 700 nm, which is the range from ultraviolet light to visible light. A light-blocking property of less than 0.3% is an indicator of the light-blocking property required to prevent deterioration of the contents.

[0062] [Table 1]

[0063] The evaluation results are shown in Table 1. Regarding gloss, which is a measure of metallic gloss, good results were obtained in the example containing an aluminum vapor-deposited film in the layer structure and in Comparative Example 1 containing aluminum foil. Aluminum has a silvery white color and tends to have a high reflectance as a material. Therefore, it is thought that the gloss is excellent because incident light from a specified incident angle is not scattered much and is reflected at a specified light-receiving angle.

[0064] Regarding oxygen barrier properties, good results of 0.03 [cc / day / pkg] or less were obtained in Example and Comparative Example 2, which included an EVOH resin layer in the layer structure, and Comparative Example 1, which included aluminum foil. From the Examples, it was found that the EVOH resin layer had sufficient gas barrier properties even with a thin thickness of about 6 μm. In Comparative Example 1, it is thought that the aluminum foil contributed to improving oxygen barrier properties in addition to gloss.

[0065] As shown in Table 1, the example obtained a good result of less than 0.3% in light blocking properties, similar to Comparative Example 1 having aluminum foil. This is thought to be because, in the example, the outer white polyethylene resin layer of the light blocking layer reflects mainly visible light incident from the outside, and the light that passes through the outer white polyethylene resin layer is absorbed by the black polyethylene resin layer provided in the middle position.

[0066] The weight ratio of different materials to the container body weight was 7.59% in Comparative Example 1, while it was 4.77% in the Example, achieving less than 6.0%, which is the target for recyclability as a single material. This is thought to be because Comparative Example 1 uses aluminum foil (specific gravity: approximately 2.71): 12 μm, which has a larger specific gravity than the resin layer, and therefore the weight ratio of different materials from the polyethylene-based resin that constitutes the outermost and innermost layers is high, whereas in the Example, the resin layers other than the polyethylene-based resin layer are only an EVOH resin layer: 6 μm and an OPP resin layer: 25 μm with an aluminum vapor deposition film, which allows the weight ratio of different materials to be kept low.

[0067] Based on the above measurement results, the Examples were rated "Good" in all categories: gloss, oxygen barrier property, moisture barrier property, light-shielding property, and the weight of different materials / container body weight ratio (recyclability). Compared to Comparative Example 1, which achieved "Good" results for gloss, oxygen barrier property, moisture barrier property, and light-shielding property, the Examples achieved gloss by using an OPP resin layer with an aluminum vapor-deposited film instead of aluminum foil, oxygen barrier property and moisture barrier property by using an OPP resin layer with an EVOH resin layer and an aluminum vapor-deposited film instead of aluminum foil, and light-shielding property by using a light-shielding PE resin layer with a three-layer structure (white / black / white) instead of aluminum foil. By adopting this configuration, the aluminum foil, which had a higher specific gravity than the resin layer in Comparative Example 1 and was a factor in increasing the weight of different materials / container body weight ratio, was replaced with an OPP resin layer with an aluminum vapor-deposited film, an EVOH resin layer, and a light-shielding PE resin layer, each with a relatively lower specific gravity, thereby reducing the weight of different materials / container body weight ratio and improving the recyclability of the tube container. [Industrial Applicability]

[0068] According to the present disclosure, it is possible to propose a tube container 100 that has light-blocking properties, barrier properties, and a metallic luster, and also has improved recyclability. [Explanation of symbols]

[0069] 1 Container body 1a Torso 1b bottom 2 Dispensing cap 3 Lid 11 Inner sealing layer (innermost layer) 13 Extruded polyethylene resin layer 15 Light blocking layer 17 High reflective layer 17a Anchor coat layer 19 Extruded polyethylene resin layer 21 Barrier Layer 21a Linear low-density polyethylene resin layer 21b Ethylene-vinyl alcohol copolymer resin layer 21c Linear low-density polyethylene resin layer 23 Outer extrusion coating layer (outermost layer) 25 Dry lamination adhesive layer 30 Tube body 31 Laminated Sheet 31a,31b side edge 32 Overlap section 40 heads 41 Shoulder 42 Mouth 42a aperture 42b Annular protrusion 100 tube containers S Storage space

Claims

1. A tube container in which the body of the container body forming the storage space for the contents has a laminated structure made of multiple materials, the laminated structure includes a light-shielding layer that suppresses light transmission, a highly reflective layer that is provided outside the light-shielding layer and has a metal vapor-deposited film formed on at least one surface of a base material, a barrier layer that suppresses gas transmission, an outermost layer, and an innermost layer; the light-shielding layer, the outermost layer, and the innermost layer are formed of a polyethylene resin, The laminated structure includes the light-shielding layer, the highly reflective layer, and the barrier layer arranged in this order from the inside.

2. 2. The tube container according to claim 1, wherein the metal vapor-deposited film is an aluminum vapor-deposited film.

3. 3. The tube container according to claim 1, wherein a weight percentage of materials other than polyethylene-based resin in the materials constituting the container body is less than 6 weight percent.

4. The tube container according to claim 1 , wherein the light-shielding layer comprises white, black, and white polyethylene-based resins in this order from the outside.

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