Container, method for manufacturing container, and method for detecting overlapping portion of stacked sheet

Abstract

To provide a container, a method for manufacturing a container, and a method for detecting an overlapping portion of a stacked sheet, which enable easy detection of an overlapping portion of a body portion.SOLUTION: A tube container 100 according to the present disclosure is a container in which a body portion 1a forming a storage space S for contents is formed of a stacked sheet 31 made of sheets of multiple materials, in which the stacked sheet 31 has a light-colored layer (first light-colored layer 11) that forms an innermost layer of the body portion 1a, and a dark-colored layer 13 that is provided radially outward of the light-colored layer and has a lower lightness than the light-colored layer, and the body portion 1a has an overlapping portion 32 formed by overlapping circumferential side end portions 31a, 31b of the stacked sheet 31 in a circumferential direction, and at least the dark-colored layer 13 protrudes circumferentially outward from the circumferential side end portion 31b of the stacked sheet 31 that is radially inner in the overlapping portion 32.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] FIELD The present disclosure relates to a container, a method for manufacturing a container, and a method for detecting overlapping portions of laminated sheets. [Background technology]

[0002] A tube container that can be filled with cosmetics, toothpaste, medicine, seasoning, or the like and from which the contents can be dispensed by pressing the body of the container is disclosed, which is formed into a cylindrical shape by rolling a laminated sheet so that its circumferential ends overlap in the circumferential direction and welding the overlapping portions by means of heat sealing or the like.

[0003] For example, Patent Document 1 discloses a tube container provided with a barrier layer having oxygen barrier properties and water vapor barrier properties, and a highly reflective layer. [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, in the tube container described in Patent Document 1, as described above, the body is formed by bonding the circumferential ends of the laminated sheets together, so it is difficult to form the overlapping portion completely seamlessly. Therefore, for example, if the overlapping portion is located in the center of the printed surface, it may result in a loss of appearance of the container, so there is a need to easily detect the circumferential position of the overlapping portion and to position it in a location that is as inconspicuous as possible.

[0006] The present disclosure aims to solve these problems, and its purpose is to propose a container, a method for manufacturing a container, and a method for detecting overlapping portions of a laminated sheet that can easily detect overlapping portions of the body. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the container of the present disclosure comprises: [1] A container in which a body portion forming a storage space for contents is formed of a laminated sheet made of sheets of multiple materials, The laminate sheet is a light-colored layer forming the innermost layer of the body; a dark layer that is provided radially outside the light layer and has a lower brightness than the light layer; and The body portion has an overlap portion formed by overlapping the circumferential side ends of the laminated sheets in the circumferential direction, and is characterized in that at least the dark layer protrudes circumferentially outward from the circumferential side end of the laminated sheet that is radially inner in the overlap portion.

[0008] The container of the present disclosure also includes: [2] In the configuration described in [1] above, it is preferable that at least the light color layer and the dark color layer protrude circumferentially outward from the circumferential side end of the laminated sheet on the radially inner side of the overlap portion.

[0009] The container of the present disclosure also includes: [3] In the configuration described in [1] or [2] above, the laminated sheet preferably has a further light-colored layer radially outward of the dark-colored layer, the lighter layer having a higher lightness than the dark-colored layer.

[0010] The container of the present disclosure also includes: [4] In the configuration described in any one of the above [1] to [3], it is preferable that the light color layer is a white resin layer and the dark color layer is a black resin layer.

[0011] The container of the present disclosure also includes: [5] In the configuration described in any one of [1] to [4] above, it is preferable that the tube container has a cylindrical tube body formed by the laminated 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.

[0012] In order to solve the above-mentioned problems, the method for manufacturing a container according to the present disclosure includes: [6] A method for manufacturing a container in which a body portion forming a storage space for contents is formed from a laminated sheet of sheets of multiple materials, The laminate sheet is a light-colored layer forming the innermost layer of the body; a dark layer that is provided radially outside the light layer and has a lower brightness than the light layer; and The circumferential side end portions of the laminated sheets are overlapped in the circumferential direction to form overlapping portions, and at least the dark color layer is caused to protrude outward in the circumferential direction from the circumferential side end portion of the radially inner laminated sheet by pressure bonding of the overlapping portions. The present invention is characterized by comprising:

[0013] The method for manufacturing a container according to the present disclosure further comprises: [7] In the configuration described in [6] above, it is preferable to heat the overlap portion from the radially inner side, thereby causing at least the dark layer to protrude circumferentially outward from the circumferential side end of only the radially inner laminated sheet.

[0014] The method for manufacturing a container according to the present disclosure further comprises: [8] In the configuration described in [6] or [7] above, the container is a tube container having a cylindrical tube body formed by the laminated 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, and it is preferable that the method includes recognizing the dark layer protruding from the circumferential side end of the laminated sheet on the radially inner side of the overlap portion, specifying the circumferential position of the overlap portion, and circumferentially aligning the head and fixing it to the body based on the specified circumferential position of the overlap portion.

[0015] The method for manufacturing a container according to the present disclosure further comprises: [9] In the configuration described in any one of [6] to [8] above, the container is a tube container having a cylindrical tube body formed by the laminated 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, and the dark color layer protruding from the circumferential side end of the laminated sheet on the radially inner side of the overlap portion is recognized to identify the circumferential position of the overlap portion; It is preferable that the method further includes printing on the outer peripheral surface of the body portion based on the identified circumferential position of the overlap portion.

[0016] The method for manufacturing a container according to the present disclosure further comprises:

[10] In the configuration described in any one of [6] to [9] above, the container is a tube container having a cylindrical tube body formed by the laminated 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, and it is preferable that the method includes recognizing the dark layer protruding from the circumferential side end of the laminated sheet on the radially inner side of the overlap portion, specifying the circumferential position of the overlap portion, and crimping the other end of the tube body to form the bottom portion based on the specified circumferential position of the overlap portion.

[0017] In order to solve the above-mentioned problems, the method for detecting an overlap portion of a laminated sheet according to the present disclosure includes:

[11] 1. A method for detecting an overlap portion of a laminated sheet forming a body portion of a container, comprising: The laminate sheet is a light-colored layer forming the innermost layer of the body; a dark layer that is provided radially outside the light layer and has a lower brightness than the light layer; and the trunk portion has an overlap portion formed by overlapping circumferentially the circumferential side ends of the laminated sheets, and at least the dark color layer protrudes circumferentially outward from the circumferential side end of the laminated sheet that is radially inner in the overlap portion, The dark color layer protruding from the circumferential side end of the radially inner laminated sheet in the overlap portion is recognized, and the circumferential position of the overlap portion is identified. The present invention is characterized by comprising: [Effects of the Invention]

[0018] According to the present disclosure, it is possible to propose a container, a method for manufacturing a container, and a method for detecting overlapping portions of a laminated sheet, which make it possible to easily detect overlapping portions of the body. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a front view of a 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 container according to an embodiment of the present disclosure. [Figure 3] 1 is a diagram showing the layer structure of a body portion (laminated sheet) of a container according to an embodiment of the present disclosure. [Figure 4] FIG. 10 is a perspective view showing a state in which circumferential side end portions of laminated sheets are bonded together to form an overlap portion. [Figure 5] FIG. 5 is a cross-sectional view of the overlap portion in FIG. 4. [Figure 6]5 is a view of the overlap portion in FIG. 4 as seen from the radially inner side. [Figure 7] 1 is a flowchart illustrating a procedure for manufacturing a container according to an embodiment of the present disclosure. [Figure 8] FIG. 2 is a block diagram showing the configuration of a control system used in a container manufacturing method and a method for detecting overlapping portions of laminated sheets according to an embodiment of the present disclosure. [Figure 9] 10 is a diagram illustrating an example of an image of the inner surface of a tube body captured by an imaging unit. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present disclosure will be described in more detail below with reference to the drawings.

[0021] FIG. 1 is a front view showing the configuration of a tube container 100 (container) 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 the 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 describing the layer structure of the container body 1, the storage space S side is referred to as the inner side, and the outer peripheral surface side of the container body 1 is referred to as the outer side. The radially outer side refers to the direction away from the axis O along a straight line that passes through the axis O of the tube container 100 in FIGS. 1 and 2 and is perpendicular to the axis O, and the radially inner side refers to the direction toward the axis O along that straight line. The circumferential direction refers to the direction of rotation around the axis O.

[0022] The accompanying drawings of the present disclosure are drawn to equal scales in the up-down direction, the front-rear direction (directions perpendicular to the plane of the paper in FIG. 1), and the left-right direction (left-right direction in FIG. 1), and the aspect ratio of the tube container 100 in the drawings represents the aspect ratio of the tube container 100 of the present disclosure (except for FIGS. 3 to 5). However, the configuration, shape, dimensional ratio, etc. of the tube container 100 in the accompanying drawings are merely one embodiment of the present disclosure. The present disclosure should be interpreted based on the wording of the claims and is not limited to the configuration, shape, dimensional ratio, etc. shown in the drawings.

[0023] 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.

[0024] The tube body 30 can be formed into a substantially cylindrical shape (see FIG. 4 ) by, for example, rolling a laminated sheet 31 having a band-shaped laminated structure so that both side end portions 31 a, 31 b slightly overlap in the circumferential direction at an overlap portion 32, and then compressing and compressing (thermocompression bonding) the sheet in the radial direction while heating the overlap portion 32 with a heating means such as high-frequency heating. The tube body 30 is then cut to a predetermined length to form the tube body 30. In this embodiment, the tube body 30 is substantially cylindrical, but it may also be formed into any other substantially cylindrical shape, for example, a substantially elliptical cylindrical shape.

[0025] In this embodiment, by applying heat to the overlap portion 32 and pressing it, the first light layer 11, the dark layer 13, and the second light layer 15 near the inner surface soften and partially protrude outward in the circumferential direction from the circumferential side edge 31b of the radially inner laminate sheet 31, as shown in Fig. 5. With this configuration, when the overlap portion 32 is viewed from the radially inner side, as shown in Fig. 6, the gray dark layer 13 can be seen through the first light layer 11 in the protruding region P where the first light layer 11, the dark layer 13, and the second light layer 15 protrude outward from the circumferential side edge 31b. This is because the first light layer 11 and the dark layer 13 protruding outward from the side edge 31b are thinner than the first light layer 11 and the dark layer 13 before protruding, and therefore a black color with a lower density than the original dark layer 13 can be seen through the first light layer 11.

[0026] The resin layer that protrudes into the protruding region P is not limited to the above-mentioned embodiment. For example, the resin layer may be configured so that only the first light color layer 11 and the dark color layer 13 that are close to the inner surface are softened by thermocompression bonding and protrude into the protruding region P, or the thickness of the dark color layer 13 may be made thicker than the first light color layer 11 and the second light color layer 15 so that only the dark color layer 13 is softened and protrudes into the protruding region P.

[0027] In this embodiment, the head 40 has a shoulder 41 formed in a truncated cone shape. The head 40 can be integrally connected to 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 around the entire circumference. In this case, the head 40 can be fixed to the tube body 30 after being circumferentially adjusted so that the hinge portion connecting the attached pouring cap 2 and the lid body 3 is located rearward (in the depth direction perpendicular to the paper surface in FIGS. 1 and 2 ). With this configuration, the tube body 30 can be positioned so that the overlap portion 32 formed on the tube body 30 is located circumferentially rearward, as shown in FIG. 2 , and the head 40 can be fixed to the tube body 30 so that the hinge portion connecting the pouring cap 2 and the lid body 3 is oriented rearward. Therefore, the appearance of the tube container 100 can be improved when viewed from the front, as shown in FIGS. 1 and 2 . The head 40 can also be formed integrally with the tube body 30 by placing the tube body 30 together with the material of the head 40 in a mold and performing compression molding.

[0028] 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.

[0029] 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.

[0030] When forming the bottom portion 1b at the lower part of the tube body 30, the tube body 30 can be positioned so that the overlap portion 32 formed on the tube body 30 is located circumferentially rearward, as shown in Fig. 2, and then the lower part of the tube body 30 can be crushed in the front-to-rear direction to form the bottom portion 1b extending in the left-to-right direction. With this configuration, when the tube container 100 is placed upside down, the crushed direction is oriented on the placement surface so that the vertical direction is the direction in which it is crushed, so the user can place the tube container 100 on the placement surface with the overlap portion 32 facing downward and difficult to see.

[0031] In this embodiment, the laminate sheet 31 constituting the barrel portion 1a of the container body 1 has a layer structure shown in Fig. 3. That is, the barrel portion 1a of the container body 1 includes, from the inside, which is the storage space S side, a white first light layer 11, a black dark layer 13, a white second light layer 15, a dry laminate (DL) adhesive layer 25, a highly reflective 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 polyethylene (PE) / ethylene-vinyl alcohol copolymer (EVOH) / PE, and an outer extruded coating layer 23. Note that portions of the container body 1 other than the barrel portion 1a (such as the head 40) may have the same layer structure as the barrel portion 1a, or may have some layers omitted or some layers added, for example, a single layer made of polyethylene (PE) resin or the like.

[0032] In this embodiment, first light color layer 11 is made of a white polyethylene (PE) resin that is flexible, resistant to contents, and has sealability. Note that first light color layer 11 does not have to be completely white. First light color layer 11 has a higher lightness than outer dark color layer 13, to the extent that the difference in lightness between first light color layer 11 and outer dark color layer 13 can be recognized with the naked eye or by image recognition.

[0033] Furthermore, a black dark layer 13 is provided on the outer surface of the first light layer 11. The dark layer 13 is made of black polyethylene (PE) resin. The dark layer 13 does not have to be completely black. The dark layer 13 has a lower brightness than the first light layer 11, to the extent that the difference in brightness between the dark layer 13 and the first light layer 11 can be recognized with the naked eye or by image recognition.

[0034] A white second light color layer 15 is provided on the outer surface of the dark color layer 13. The second light color layer 15 is made of a white polyethylene (PE) resin. The second light color layer 15 does not have to be completely white. The second light color layer 15 has a higher lightness than the dark color layer 13, to the extent that the difference in lightness between the second light color layer 15 and the inner dark color layer 13 can be recognized with the naked eye or by image recognition.

[0035] In this embodiment, the first light layer 11, the dark layer 13, and the second light layer 15 function as a light-shielding layer 10 that blocks light from outside. In this embodiment, the total thickness of the three light layers 10 is approximately 40 μm. The light-shielding layer 10 reflects mainly visible light incident from outside using the second light layer 15, which is an outer white polyethylene-based resin layer. Furthermore, light that passes through the outer second light layer 15 is absorbed by the dark layer 13, which is a black polyethylene-based resin layer located in the middle. In this way, the light-shielding layer 10 can prevent the contents in the storage space S from being exposed to light incident from outside.

[0036] The total thickness of the light-shielding layer 10 may be changed depending on the level of light-shielding required for the contents, and the proportion of the black dark layer 13 may be appropriately changed. Furthermore, the thickness ratio between the first light layer 11 and the dark layer 13 may be appropriately adjusted to accurately recognize the circumferential position of the overlap portion 32 of the laminated sheet 31 described below.

[0037] The highly reflective layer 17 is formed by forming an aluminum vapor-deposited film on one side (in this embodiment, the 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 side of the base material, which has a small surface roughness, and therefore the surface roughness is also 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 18 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 glossiness). 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.

[0038] In this embodiment, OPP resin is used as the base material of the high-reflection layer 17. Although OPP resin is a different material from the polyethylene-based resin that constitutes the first light color 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.

[0039] 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.

[0040] 3, in this embodiment, the highly reflective layer 17 is adhered to the outer surface of the light-shielding layer 10 (second light color 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.

[0041] 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.

[0042] 3, the barrier layer 21 has a three-layer structure of a polyethylene (PE) resin layer 21a / ethylene-vinyl alcohol copolymer (EVOH) resin layer 21b / PE resin layer 21c. For example, the thicknesses of the PE resin layers 21a and 21c can be set to approximately 27 μm, and the thickness of the EVOH resin layer 21b can be set to approximately 6 μm.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The outer extruded covering layer 23 is made of extruded polyethylene (PE) resin, which has flexibility, transparency, and the ability to be decorated by printing or the like. In this embodiment, the thickness of the outer extruded covering layer 23 can be approximately 60 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 the inner first light-color layer 11 to the outer barrier layer 21 in FIG. 3 are laminated, forming a cylindrical body as shown in FIG. 4, and then extruding the outer extruded covering layer 23 over the entire outer peripheral surface of the cylindrical body. Alternatively, instead of the outer extruded covering layer 23, an extruded polyethylene resin layer may be used as an adhesive layer to bond the outer polyethylene resin layer to the outside of the barrier layer 21. The outer surface of the outer extruded covering layer 23 may be subjected to, for example, decorative silkscreen printing, offset printing, or coating.

[0047] The outer extruded covering layer 23 and the first light color layer 11 can be formed of, for example, a low-density polyethylene (LDPE) resin to impart high squeezability to the barrel portion 1a of the container body 1, but are not limited to this embodiment. For example, the outer extruded covering layer 23 and the first light color layer 11 may be formed of a high-density polyethylene resin (HDPE) or the like. Furthermore, the configuration of the outer extruded covering layer 23 and the first light color layer 11 is not limited to the above embodiment, and a polypropylene resin, which is a polyolefin resin other than a polyethylene resin, may be used. Furthermore, various resins other than polyolefin resin may be used.

[0048] The layer structure of the laminate sheet 31 is not limited to the embodiment shown in FIG. 3 . For example, a transparent polyethylene resin layer may be further provided inside the first light color layer 11. This is because providing a transparent resin layer on the inside does not affect the visibility of the dark color layer 13 that protrudes circumferentially outward. Furthermore, since the transparent polyethylene resin layer functions as a sealant, there is an advantage in that the first light color layer 11 is not required to have high resistance to contents and sealability. When providing a transparent polyethylene resin layer inside the first light color layer 11, for example, an extruded polyethylene resin layer can be used as an adhesive layer to provide the transparent polyethylene resin layer inside the first light color layer 11 by bonding. The thickness of the transparent polyethylene resin layer can be, for example, approximately 80 μm.

[0049] Next, the pouring cap 2 will be described. The pouring cap 2 has a pouring hole for pouring 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 42 of the container body 1 by undercut engagement. In addition, a lid 3 that covers the pouring hole is provided above the pouring cap 2. The lid 3 is formed integrally with the pouring cap 2 by a hinge (not shown), and the pouring hole can be opened or closed by rotating the lid 3 about the hinge. In this embodiment, the hinge is formed integrally with the pouring cap 2 and the rear side of the lid 3 (the depth direction side perpendicular to the plane of FIG. 1). Note that the attachment of the pouring cap 2 to the container body 1 is not limited to the undercut engagement described above, and the pouring cap 2 may be attached by threaded engagement with a male thread formed in the mouth 42 of the container body 1, for example.

[0050] 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 (laminated sheet 31) shown in FIG. 3, 90% by weight or more is made of polyethylene-based resin. The head 40 is also made of polyethylene-based resin. Therefore, when recycling the container body 1, it 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 of the cap, but if they are made of polyethylene resin, recyclability can be further improved.

[0051] In addition, the resin layers made of polyethylene-based resin in Figure 3 are, from the inside, a first light-colored layer 11, a dark-colored layer 13, a second light-colored layer 15, an extruded polyethylene (PE) resin layer 19, a polyethylene (PE) resin layer 21a, a PE resin layer 21c, and an outer extruded coating layer 23.

[0052] 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.

[0053] 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.

[0054] Next, a method for manufacturing the tube container 100 (container) according to this embodiment will be described with reference to FIG.

[0055] 3 is formed (step S101 in FIG. 7). The laminate sheet 31 can be formed, for example, by (1) preparing a light-shielding layer 10 including a first light-color layer 11, a dark-color layer 13, and a second light-color layer 15, (2) bonding a high-reflection layer 17, which is formed by vapor-depositing aluminum on the outer surface of an oriented polypropylene (OPP) film, to the outer surface of the second light-color layer 15 of the light-shielding layer 10 using a dry laminate (DL) adhesive layer 25, (3) applying an anchor coat (AC) layer 17a to the outer surface of the high-reflection layer 17 to increase adhesive strength, and bonding a barrier layer 21 (polyethylene resin layer 21a / ethylene-vinyl alcohol copolymer resin layer 21b / polyethylene resin layer 21c) using an extruded polyethylene resin layer 19 as an adhesive layer, and (4) extruding an outer extruded coating layer 23, which is a polyethylene-based resin layer, on the outer side of the barrier layer 21.

[0056] Next, as shown in FIG. 4, the circumferential side ends 31a, 31b of the laminated sheet 31 are overlapped in the circumferential direction to form the overlap portion 32 (step S102 in FIG. 7).

[0057] Further, the tube body 30 is formed by thermocompression bonding the overlapping portion 32, and as shown in FIG. 5, the first light color layer 11, the dark color layer 13, and the second light color layer 15 are protruded from the circumferential side end portion 31b of the radially inner laminated sheet 31 (step S103 in FIG. 7).

[0058] In this embodiment, by selectively heating and compressing only the radially inner side of the overlap portion 32 using high-frequency heating, the first light layer 11, the dark layer 13, and the second light layer 15 near the inner surface of the radially inner laminate sheet 31 are softened, and portions of them protrude circumferentially outward from the side end 31b. Heating only the radially inner side is achieved by applying high-frequency waves with an iron plate placed only on the radially inner side of the overlap portion 32. With this configuration, when the overlap portion 32 is viewed from the radially inner side, as shown in FIG. 6 , the gray dark layer 13 can be seen through the first light layer 11 in the protruding region P where the first light layer 11, the dark layer 13, and the second light layer 15 protrude from the circumferential side end 31b.

[0059] In this embodiment, laminated sheets 31 (approximately 200 μm) having the layer structure shown in Fig. 3 are overlapped at overlapping portions 32 and then compressed to a thickness of approximately 300 μm. The thicknesses of the first light color layer 11, the dark color layer 13, and the second light color layer 15 that protrude from the side end portions 31b are each, for example, approximately 5 μm.

[0060] The resin layer that protrudes into the protruding region P is not limited to the above-mentioned embodiment. For example, the first light color layer 11 and the dark color layer 13 that are close to the inner surface may be softened by thermocompression bonding and protrude into the protruding region P. Alternatively, the dark color layer 13 may be formed thicker than the first light color layer 11 and the second light color layer 15 so that only the dark color layer 13 softens and protrudes into the protruding region P. The heating means for the overlapping portion 32 is not limited to high-frequency heating, and other means such as resistance heating may be used.

[0061] Next, in the control system 200 used in the manufacturing method of the tube container 100 (container) according to an embodiment of the present disclosure shown in Fig. 8, the imaging unit 102 (see Figs. 4 and 8) photographs the tube body 30 from the radially inner side in response to instructions from the control unit 101, recognizes the dark layer 13 protruding from the circumferential end, and identifies the circumferential position of the overlapping portion 32 (step S103 in Fig. 7). More specifically, as shown in Fig. 4, the imaging unit 102 photographs the inner surface of the tube body 30 while rotating around the axis inside the tube body 30, detects the protruding region P whose brightness is lower than the surrounding region by a predetermined threshold or more, and identifies the circumferential position of the overlapping portion 32 from the circumferential position of the imaging unit 102 when the right end of the protruding region P coincides with the horizontal center position E of the imaging region (see Fig. 9). The circumferential position of the overlapping portion 32 is identified and stored in the storage unit 103. The brightness here may conform to the definition of brightness specified in, for example, JIS Z 8781-6:2017.

[0062] Alternatively, instead of the above configuration, the imaging unit 102 may be fixed inside the tube body 30, and the imaging unit 102 may detect the protruding area P while rotating the tube body 30 around its axis using the drive unit 104, and the circumferential position of the overlapping portion 32 may be determined from the rotational position of the tube body 30 when the right end of the protruding area P coincides with the horizontal center position E of the imaging area.

[0063] Next, the control unit 101 drives the drive unit 104 to rotate the tube body 30 about its axis so that the overlapping portion 32 identified in step S104 is located at a circumferential position opposite the print head 40. Then, printing is performed on the outer peripheral surface of the body portion 1a (tube body 30) at a circumferential position opposite the overlapping portion 32 (step S105 in FIG. 7). By adjusting the position of the tube body 30 in the circumferential direction so that the overlapping portion 32 and the printing surface are located at roughly opposite circumferential positions, and then printing on the outer peripheral surface of the tube body 30, it is possible to prevent the overlapping portion 32 and the printing surface from overlapping or being positioned close to each other, thereby improving the appearance of the tube container 100.

[0064] Next, the control unit 101 rotates the tube body 30 around its axis using the drive unit 104 so that the overlapping portion 32 identified in step S104 is located at a predetermined circumferential position relative to the head 40, and attaches the head 40 to one axial end of the tube body 30 (step S106 in FIG. 7). The head 40 can also be fixed to the tube body 30 after, for example, adjusting its position circumferentially so that a hinge portion that integrally connects the pouring cap 2 and the lid body 3 attached to the head 40 is located at approximately the same circumferential position as the overlapping portion 32. Therefore, by gathering both the hinge portion and the overlapping portion 32 in inconspicuous circumferential positions, the appearance of the tube container 100 can be improved.

[0065] Next, the control unit 101 causes the drive unit 104 to rotate the tube body 30 about its axis so that the overlapping portion 32 identified in step S104 is positioned at a predetermined circumferential position, and then seals the other end of the tube body 30 by crimping or the like while crushing the circumferential position where the overlapping portion 32 is located, thereby forming the bottom portion 1b (step S107 in FIG. 7). By forming the bottom portion 1b in this manner, when the tube container 100 is placed on a support surface, the crushed direction is oriented on the support surface so that the vertical direction is the upside-down direction. Therefore, a user can make the overlapping portion 32 less visible by placing the overlapping portion 32 facing downward on the support surface.

[0066] Each process in the control unit 101 can be realized as software processing by, for example, causing a predetermined program stored in the storage unit 103 or the like to be executed by a CPU (Central Processing Unit) or DSP (Digital Signal Processor) included in the control unit 101. However, without being limited to this aspect, each process may be configured to be realized as hardware processing by, for example, an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), or the like.

[0067] The storage unit 103 that stores the predetermined program includes a readable storage medium, and the storage medium includes a rewritable and programmable ROM such as an EPROM, an EEPROM, or a flash memory, or other tangible storage medium such as a magnetic disk storage medium that can store information, or any combination thereof. The storage unit 103 may be provided within the control unit 101, or may be a storage medium in an external storage device that can be connected to the control unit 101.

[0068] As described above, the tube container 100 according to this embodiment has a body 1a that defines a storage space S for contents and is formed from a laminated sheet 31 made of sheets of multiple materials. The laminated sheet 31 has a light-colored layer (first light-colored layer 11) that forms the innermost layer of the body 1a and a dark-colored layer 13 that is provided radially outward of the light-colored layer and has a lower lightness than the light-colored layer. The body 1a has an overlapping portion 32 formed by overlapping circumferential side ends 31a, 31b of the laminated sheet 31 in the circumferential direction, and at least the dark-colored layer 13 protrudes circumferentially outward from the circumferential side end 31b of the laminated sheet 31 that is radially inner in the overlapping portion 32. This configuration allows the dark layer 13 that protrudes outward from the overlapping portion 32 to be visually recognized directly or through the first light-colored layer 11 from the radially inner side of the tube body 30 formed by rolling the laminated sheet 31 into a cylindrical shape. Therefore, the overlapping portion 32 of the tube body 30 can be easily recognized, and the head 40 can be appropriately attached.

[0069] In this embodiment, at least the light color layer and the dark color layer 13 are configured to protrude circumferentially outward from the circumferential side end 31b of the laminated sheet 31 on the radially inner side of the overlap portion 32. By adopting such a configuration, the dark color layer 13 protruding from the overlap portion 32 can be seen through the light color layer, making it possible to prevent the overlap portion 32 from impairing its aesthetic appearance when viewed from the inside.

[0070] Furthermore, in this embodiment, the laminate sheet 31 is configured to have an additional light-colored layer (second light-colored layer 15) that is lighter than the dark-colored layer 13, radially outward of the dark-colored layer 13. By employing such a configuration, the outer second light-colored layer 15 mainly reflects visible light incident from the outside, and the dark-colored layer 13 absorbs light that has passed through the second light-colored layer 15. Therefore, the light-shielding layer 10 including the second light-colored layer 15 and the dark-colored layer 13 can prevent the contents in the storage space S from being exposed to light incident from the outside.

[0071] In this embodiment, the light layer is a white resin layer, and the dark layer 13 is a black resin layer. By adopting such a configuration, the color contrast between the light layer and the dark layer 13 can be maximized, making it easier to visually recognize the protruding region P from the inside and to identify the overlapping portion 32. Furthermore, the black dark layer 13 efficiently absorbs light incident from the outside in the radial direction, effectively preventing the contents in the storage space S from being exposed to light incident from the outside.

[0072] In this embodiment, the tube container is configured to include a cylindrical tube body 30 formed from a laminated sheet 31, a resin head 40 provided at one end of the tube body 30 and having a shoulder and a mouth protruding from the shoulder, and a bottom 1b provided at the other end of the tube body 30. By adopting this configuration, the laminated sheet 31 can be rolled into a cylindrical shape and used as the body 1a without waste. Furthermore, the recyclability of the container body 1 can be improved.

[0073] This embodiment also relates to a method for manufacturing a container 100 having a body 1a, which defines a storage space S for contents, formed of a laminated sheet 31 made of sheets of multiple materials. The laminated sheet 31 includes a light-colored layer (first light-colored layer 11) constituting the innermost layer of the body 1a and a dark-colored layer 13 radially outward of the light-colored layer and having a lower lightness than the light-colored layer. The circumferential ends 31a, 31b of the laminated sheet 31 are overlapped circumferentially to form an overlapping portion 32. The overlapping portion 32 is crimped to at least cause the dark layer 13 to protrude circumferentially outward from the radially inner end 31b of the laminated sheet 31. This configuration allows the dark layer 13 to be visually recognized from the radially inner side of the tube body 30, which is formed by rolling the laminated sheet 31 into a cylindrical shape, either directly or through the first light-colored layer 11. This allows the overlapping portion 32 of the tube body 30 to be easily recognized, allowing for appropriate installation of the head 40, etc.

[0074] In addition, in this embodiment, by selectively heating only the radially inner side of the overlap portion 32, at least the dark color layer 13 is caused to protrude circumferentially outward from the circumferential side end 31b of the radially inner laminate sheet 31. By adopting such a configuration, it is possible to make it difficult for the dark color layer 13 of the radially outer laminate sheet 31 to protrude outward from the circumferential side end 31a, which makes it easier to improve the appearance of the tube container 100 when viewed from the outside.

[0075] In this embodiment, the container includes a cylindrical tube body 30 formed from a laminated sheet 31, a resin head 40 having a shoulder at one end of the tube body 30 and a mouth protruding from the shoulder, and a bottom 1b at the other end of the tube body 30. The process includes identifying the dark layer 13 extending from the circumferential end 31b of the laminated sheet 31 on the radially inner side of the overlap portion 32, identifying the circumferential position of the overlap portion 32, and circumferentially aligning the head 40 and fixing it to the body 1a based on the identified circumferential position of the overlap portion 32. By adopting this configuration, the tube body 30 can be assembled so that the overlap portion 32 formed on the tube body 30 is positioned circumferentially rearward, as shown in FIG. 2, and the hinge connecting the pouring cap 2 and the lid 3 can be oriented rearward. This improves the appearance of the tube container 100 when viewed from the front, as shown in FIGS. 1 and 2.

[0076] In this embodiment, the container is a tube container having a cylindrical tube body 30 formed from a laminate sheet 31, a resin head 40 provided at one end of the tube body 30 and having a shoulder portion and a mouth portion protruding from the shoulder portion, and a bottom portion 1b provided at the other end of the tube body 30. The method includes recognizing the dark layer 13 extending from the circumferential end portion 31b of the laminate sheet 31 on the radially inner side of the overlap portion 32, identifying the circumferential position of the overlap portion 32, and printing on the outer peripheral surface of the body portion 1a based on the identified circumferential position of the overlap portion 32. This configuration allows the tube body 30 to be circumferentially adjusted so that the overlap portion 32 and the printing surface are positioned approximately on opposite sides of the circumference, and then printing on the outer peripheral surface of the tube body 30. This prevents the overlap portion 32 and the printing surface from overlapping or being positioned close to each other, improving the appearance of the tube container 100.

[0077] In this embodiment, the container is a tube container having a cylindrical tube body 30 formed from a laminated sheet 31, a resin head 40 provided at one end of the tube body 30 and having a shoulder and a mouth protruding from the shoulder, and a bottom 1b provided at the other end of the tube body 30, and the method includes recognizing the dark layer 13 protruding from the circumferential side end 31b of the laminated sheet 31 on the radially inner side of the overlap portion 32, identifying the circumferential position of the overlap portion 32, and crimping the other end of the tube body 30 to form the bottom 1b based on the identified circumferential position of the overlap portion 32. By adopting this configuration, the tube body 30 can be positioned so that the overlap portion 32 formed on the tube body 30 is located circumferentially rearward, and then the lower part of the tube body 30 can be crushed in the front-to-rear direction to form the bottom 1b extending in the left-to-right direction. As a result, when the tube container 100 is placed on its side on the placement surface, it is oriented on the placement surface so that the crushed direction is the up-down direction, and the user can place it on the placement surface with the overlap part 32 facing downwards so that it is difficult to see.

[0078] Furthermore, this embodiment is a method for detecting an overlap portion 32 of a laminated sheet 31 forming the body portion 1a of a container, in which the laminated sheet 31 has a light-colored layer (first light-colored layer 11) that forms the innermost layer of the body portion 1a, and a dark-colored layer 13 that is located radially outside the light-colored layer and is darker than the light-colored layer, and the body portion 1a has an overlap portion 32 formed by overlapping circumferential side end portions 31a, 31b of the laminated sheet 31 in the circumferential direction, and at least the dark layer 13 protrudes circumferentially outward from the circumferential side end portion 31b of the laminated sheet 31 that is radially inner in the overlap portion 32, and is configured to include recognizing the dark layer 13 protruding from the circumferential side end portion 31b of the laminated sheet 31 that is radially inner in the overlap portion 32, and identifying the circumferential position of the overlap portion 32. By adopting such a configuration, the dark color layer 13 protruding from the overlap portion 32 to the outside can be seen from the radially inside of the tube body 30, which is formed by rolling the laminated sheet 31 into a cylindrical shape, either directly or through the first light color layer 11. Therefore, the overlap portion 32 in the tube body 30 can be easily recognized, and the head 40 can be appropriately attached.

[0079] 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.

[0080] For example, in this embodiment, the outer extruded coating layer 23 (outermost layer) of the laminated structure is configured to use an extruded PE resin layer, but in this case, the outer surface of the outer extruded coating layer 23 may be decorated by offset printing, coating, hot stamping, etc.

[0081] 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. [Industrial Applicability]

[0082] According to the present disclosure, it is possible to propose a container, a method for manufacturing a container, and a method for detecting overlapping portion 32 of laminated sheet 31, which enable easy detection of overlapping portion 32 of body portion 1a. [Explanation of symbols]

[0083] 1 Container body 1a Torso 1b bottom 2 Dispensing cap 3 Lid 10 Light blocking layer 11 First light layer (light layer) (innermost layer) 13 Dark layer 15 Second light layer (further light layer) 17 High reflective layer 17a Anchor coat layer 19 Extruded polyethylene resin layer 21 Barrier Layer 21a Polyethylene resin layer 21b Ethylene-vinyl alcohol copolymer resin layer 21c Polyethylene resin layer 23 Outer extrusion coating layer (outermost layer) 25 Dry lamination adhesive layer 30 Tube body 31 Laminated Sheet 31a, 31b side end 32 Overlap section 40 heads 41 Shoulder 42 Mouth 42a aperture 42b Annular protrusion 100 tube containers (containers) 101 Control section 102 Imaging unit 103 Storage section 104 Drive unit 200 Control System E Horizontal center position of the imaging area O axis P Protrusion area S Storage space

Claims

1. A container in which a body portion forming a storage space for contents is formed of a laminated sheet made of sheets of multiple materials, The laminate sheet is a light-colored layer forming the innermost layer of the body; a dark layer that is provided radially outside the light layer and has a lower brightness than the light layer; and The body portion has an overlap portion formed by overlapping the circumferential side ends of the laminated sheet in the circumferential direction, and at least the dark color layer protrudes circumferentially outward from the circumferential side end of the laminated sheet that is radially inner in the overlap portion.

2. The container according to claim 1 , wherein at least the light color layer and the dark color layer protrude circumferentially outward from a circumferential side end of the radially inner laminated sheet in the overlap portion.

3. 3. The container according to claim 1, wherein the laminated sheet has a further light-colored layer radially outward of the dark-colored layer, the lighter layer having a higher lightness than the dark-colored layer.

4. 3. The container according to claim 1, wherein the light color layer is a white resin layer and the dark color layer is a black resin layer.

5. 3. The container according to claim 1, wherein the container is a tube container having a cylindrical tube body formed from the laminated 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.

6. A method for manufacturing a container in which a body portion forming a storage space for contents is formed from a laminated sheet of sheets of multiple materials, The laminate sheet is a light-colored layer forming the innermost layer of the body; a dark layer that is provided radially outside the light layer and has a lower brightness than the light layer; and The circumferential side end portions of the laminated sheets are overlapped in the circumferential direction to form overlapping portions, and at least the dark color layer is caused to protrude outward in the circumferential direction from the circumferential side end portion of the radially inner laminated sheet by pressure bonding of the overlapping portions. A method for manufacturing a container, comprising:

7. The method for manufacturing a container according to claim 6, wherein at least the dark layer is caused to protrude circumferentially outward from the circumferential side end of the radially inner laminated sheet by selectively heating only the radially inner side of the overlapping portion.

8. the container is a tube container having a cylindrical tube body formed by the laminated 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, identifying the dark color layer protruding from the circumferential side end of the radially inner laminated sheet in the overlap portion, and identifying the circumferential position of the overlap portion; circumferentially aligning the head based on the identified circumferential position of the overlap portion and fixing the head to the body portion; A method for manufacturing the container according to claim 6 or 7, comprising:

9. the container is a tube container having a cylindrical tube body formed by the laminated 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, identifying the dark color layer protruding from the circumferential side end of the radially inner laminated sheet in the overlap portion, and identifying the circumferential position of the overlap portion; printing on the outer peripheral surface of the body portion based on the identified circumferential position of the overlap portion; A method for manufacturing the container according to claim 6 or 7, comprising:

10. the container is a tube container having a cylindrical tube body formed by the laminated 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, identifying the dark color layer protruding from the circumferential side end of the radially inner laminated sheet in the overlap portion, and identifying the circumferential position of the overlap portion; crimping the other end of the tube body to form the bottom portion based on the identified circumferential position of the overlap portion; A method for manufacturing the container according to claim 6 or 7, comprising:

11. 1. A method for detecting an overlap portion of a laminated sheet forming a body portion of a container, comprising: The laminate sheet is a light-colored layer forming the innermost layer of the body; a dark layer that is provided radially outside the light layer and has a lower brightness than the light layer; and the trunk portion has an overlap portion formed by overlapping circumferentially the circumferential side ends of the laminated sheets, and at least the dark color layer protrudes circumferentially outward from the circumferential side end of the laminated sheet that is radially inner in the overlap portion, The dark color layer protruding from the circumferential side end of the radially inner laminated sheet in the overlap portion is recognized, and the circumferential position of the overlap portion is identified. A detection method comprising:

Images