Tube container and tube container production method

Abstract

To provide a tube container which has excellent recyclability and is more inexpensive.SOLUTION: A pouring part 20 of a tube container 1 according to the present invention includes: a pouring port 21 for pouring contents; a shoulder section 22; and an extension section 23. The shoulder section 22 radially extends from the pouring port 21 with the pouring port 21 as the center when viewed from an axial direction DA. The extension section 23 extends in a direction opposite to the side of the pouring port 21 along the axial direction DA from an outer circumferential end 221 of the shoulder section 22. The extension section 23 is joined with an inner circumferential face 131 of one end 13 of a cylindrical barrel section 10 on the outside in a radial direction. The pouring part 20 is made of a resin composition including a polyester resin. The pouring part 20 is an insert molding member joined to the one end 13 of the cylindrical barrel section 10 by being injected with the resin composition. The one end 13 of the cylindrical barrel section 10 is crossed with a virtual extension surface VS formed by extending an inner surface 222 of the shoulder section 22 toward the outside in a radial direction.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present invention relates to a tube container and a method for manufacturing the tube container.

Background Art

[0002] A conventional tube container is disclosed in Japanese Patent No. 6976032 (Patent Document 1). The tube container disclosed in Patent Document 1 is composed of a pouring unit and a body portion. The pouring unit pours out the content. The pouring unit includes a pouring outlet portion through which the content is poured out, and a shoulder portion that protrudes radially outward from the pouring outlet portion. The body portion is for accommodating the content. One side edge surface of one side of the film of the body portion is overlapped with the other side surface of the other side edge, and the overlapped one side edge and the other side edge are welded by heat sealing. The inner surface of one end in the axial direction of the body portion is welded to the outer peripheral surface of the shoulder portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a tube container having a shape as disclosed in Patent Document 1, in order to improve recyclability, a tube container that mainly contains a polyester-based resin as a whole and is thinned is required.

[0005] The extrusion part (extrusion unit) is being considered to be formed of a resin composition containing a polyester-based resin. When the extrusion part is formed by compression molding, it becomes relatively difficult to reduce the thickness of the extrusion part. Further, since the polyester-based resin has a relatively large change in fluidity with temperature change, it is not suitable for compression molding. For this reason, forming the extrusion part by injection molding is being considered. Further, so-called insert molding is being considered in order to simplify the process of joining the extrusion part and the cylindrical body part.

[0006] On the other hand, the cylindrical body part is being considered to include a base material layer containing a polyester-based resin and to form a sheet into a cylindrical shape. And, in order to improve recyclability and squeezability, it is being considered to reduce the thickness of the sheet. However, when a relatively thin sheet including a base material layer containing a polyester-based resin is used as the cylindrical body part, when insert molding is performed, the molten resin composition easily oozes out to the outer peripheral side of the cylindrical body part. As a result, the yield in the forming process of the extrusion part may decrease, and the manufacturing cost of the tube container may increase.

[0007] The present disclosure has been made in view of the above problems, and an object thereof is to provide a tube container having excellent recyclability and being less expensive.

Means for Solving the Problems

[0008] The tube container according to the present invention includes a cylindrical body portion and a pouring portion. The cylindrical body portion has a strip-shaped welded portion formed by bending or curving a single sheet and welding the first side end portion in the plane direction of the sheet and the second side end portion of the sheet located opposite to the first side end portion so as to overlap each other in the thickness direction of the sheet. The pouring portion is joined to one end portion in the axial direction of the cylindrical body portion and can pour out the contents accommodated in the cylindrical body portion. The pouring portion includes a pouring port for pouring out the contents, a shoulder portion, and an extending portion. The shoulder portion expands radially from the pouring port around the pouring port when viewed in the axial direction. The extending portion extends axially from the outer peripheral end of the shoulder portion in a direction opposite to the pouring port side. The extending portion is joined to the inner peripheral surface of one end portion of the cylindrical body portion on the outer side in the radial direction. The sheet includes a base material layer containing a polyester-based resin. The pouring portion is made of a resin composition containing a polyester-based resin. The pouring portion is an insert molding member joined to one end portion of the cylindrical body portion by injection of the resin composition. One end portion of the cylindrical body portion intersects a virtual extension surface formed by extending the inner surface of the shoulder portion radially outward.

[0009] According to the above configuration, when the resin composition containing the polyester-based resin is injection-molded onto the cylindrical body portion, the resin composition can take a flow path that flows in from the shoulder portion in order to the extending portion. At this time, when the resin composition takes a flow path along the virtual extension surface, the resin composition abuts against the inner peripheral surface of one end portion of the cylindrical body portion due to the above configuration. The cylindrical body portion is pushed outward in the radial direction by the resin composition. Therefore, it is possible to suppress the resin composition from surrounding the outer peripheral side of the cylindrical body portion. As a result, the yield when insert-molding the pouring portion so as to join it to the inner peripheral surface of one end portion of the cylindrical body portion is improved. Therefore, according to the above configuration, it is possible to provide a tube container that is excellent in recyclability and less expensive.

Advantages of the Invention

[0010] According to the present invention, it is possible to provide a tube container that is excellent in recyclability and less expensive.

Brief Description of the Drawings

[0011]

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BEST MODE FOR CARRYING OUT THE INVENTION

[0012] Hereinafter, a tube container according to each embodiment of the present invention will be described. In the description of each of the following embodiments, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

[0013] (Embodiment 1) <Tube Container> FIG. 1 is a front view showing a tube container according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing the tube container according to Embodiment 1 of the present invention from one side. FIG. 3 is a perspective view showing a state where the cap portion is removed from the tube container. FIG. 4 is a perspective view showing a state where the cap portion of the tube container according to Embodiment 1 of the present invention is removed from the other side. FIG. 5 is a cross-sectional view of a part of the tube container of FIG. 1 as viewed in the direction of the arrow along line V-V.

[0014] As shown in FIGS. 1 to 5, the tube container 1 according to Embodiment 1 of the present invention includes a cylindrical body portion 10, a pouring portion 20, an end seal portion 30, and a cap portion 40. FIG. 6 is a cross-sectional view of the cylindrical body portion of FIG. 1 as viewed in the direction of the arrow along line VI-VI. In the tube container 1 shown in FIG. 5, the cap portion 40 is not shown. In the figures described later, the cap portion 40 may not be shown. The tube container 1 may not include the cap portion 40.

[0015] As shown in FIGS. 1 to 6, the cylindrical body portion 10 has a sheet base portion 11, a welded portion 12, one end portion 13, the other end portion 14, and a main body portion 15.

[0016] FIG. 7 is an exploded perspective view of the tube container according to Embodiment 1 of the present invention. As shown in FIGS. 6 and 7, the sheet base portion 11 is located between a first side end portion SE1 in the plane direction DP of a single sheet S and a second side end portion SE2 of the sheet S located opposite to the first side end portion SE1. The welded portion 12 is formed by bending or curving the sheet S and welding the first side end portion SE1 and the second side end portion SE2 so as to overlap each other in the thickness direction of the sheet S. The thickness direction is a direction orthogonal to the plane direction DP of the sheet S.

[0017] Thus, in the present embodiment, the cylindrical body portion 10 is made of a single sheet S. First, the details of the sheet S will be described.

[0018] Before welding the first side end portion SE1 and the second side end portion SE2 to each other, the sheet S has a rectangular outer shape when viewed from the thickness direction of the sheet S. However, the shape of the sheet S when viewed from the thickness direction is not limited as long as the cylindrical body portion 10 can be formed by bending or curving the sheet S.

[0019] FIG. 8 is a partial cross-sectional view of a sheet constituting a cylindrical body portion and an end seal portion according to Embodiment 1 of the present invention. As shown in FIG. 8, the sheet S includes at least a first base material layer SL1 and a reinforcing layer RL. The first base material layer SL1 is located on the center side of the cylindrical body portion 10 in the radial direction of the cylindrical body portion 10. That is, the first base material layer SL1 is the innermost layer of the cylindrical body portion 10.

[0020] The first base material layer SL1 contains a polyester-based resin as a main component. From the viewpoint of improving recyclability, it is preferable that the first base material layer SL1 contains a polyester-based resin as a main component. In addition, the content of the polyester-based resin in the first base material layer SL1 is preferably 95% by mass or more, or 99% by mass or more.

[0021] The polyester-based resin contained in the first base material layer SL1 is not particularly limited as long as it can be used as the cylindrical body portion 10 of the tube container 1. Examples of the polyester-based resin include polyethylene terephthalate, polyethylene naphthalate, glycol-modified polyethylene terephthalate (PETG, polyethylene terephthalate in which a part of the glycol component is modified with cyclohexanedimethanol (CHDM) or neopentyl glycol, etc.), and polylactic acid. It is preferable that the first base material layer SL1 contains only a polyester-based resin as a resin component.

[0022] From the perspective of the recyclability of the cylindrical body 10, the polyester resin in the first base material layer SL1 is preferably homopolyethylene terephthalate, or polyethylene terephthalate such as copolyethylene terephthalate obtained by copolymerizing ethylene glycol, terephthalic acid, and a third component, or glycol-modified polyethylene terephthalate, and more preferably homopolyethylene terephthalate. Further, from the perspective of welding the sheets S to each other at the welded portion 12 with relatively low energy and efficiently transmitting ultrasonic vibrations, the polyester resin in the first base material layer SL1 is preferably an amorphous polyester resin (such as amorphous polyethylene terephthalate and glycol-modified polyethylene terephthalate). Therefore, the first base material layer SL1 is most preferably amorphous homopolyethylene terephthalate from the viewpoints of both the recyclability of the cylindrical body 10 and the adhesiveness of the sheet S at the welded portion 12 and the end seal portion 30 described later. From the perspective of reducing environmental impact, it is preferable that the polyester resin in the first base material layer SL1 is made of recycled raw materials or biomass raw materials. However, when the contents are to be accommodated inside the cylindrical body 10, it is also preferable that the polyester resin in the first base material layer SL1 is made of virgin raw materials.

[0023] Also, the first base material layer SL1 may be a single-layer film or may be a part of a laminated film. The film (single-layer film or laminated film) constituting the first base material layer SL1 is preferably an unstretched film or a uniaxially stretched film. Thereby, since the crystallization of the surface of the first base material layer SL1 is suppressed, the weldability with other layers is improved when performing ultrasonic welding described later to form the cylindrical body 10. Further, the adhesiveness between the sheets S in the cylindrical body 10 and the end seal portion 30 described later, and the bonding strength between the cylindrical body 10 and the pouring portion 20 are improved. From the viewpoints of the above-described improvement in adhesiveness and bonding strength, the film constituting the first base material layer SL1 is particularly preferably an unstretched film.

[0024] The reinforcing layer RL is laminated on the first base material layer SL1. The reinforcing layer RL is located on the radially outer side of the cylindrical body portion 10 when viewed from the first base material layer SL1. The sheet S may further include another layer between the first base material layer SL1 and the reinforcing layer RL. By including the reinforcing layer RL in the sheet S constituting the cylindrical body portion 10, the strength of the tube container 1 can be improved, and it is possible to suppress the tube container 1 from being damaged when the tube container 1 falls.

[0025] The reinforcing layer RL contains a resin component as a main component. For example, it contains a polyester-based resin, a polyolefin-based resin, or a polyamide-based resin as a main component. From the viewpoint of improving recyclability, it is preferable that the reinforcing layer RL contains a polyester-based resin as a main component, similarly to the first base material layer SL1. From the viewpoint of further suppressing the tube container 1 from being damaged when the tube container 1 falls, it is also preferable that the reinforcing layer RL contains a polyamide-based resin as a main component.

[0026] As the polyester-based resin of the reinforcing layer RL, it is preferably homopolyethylene terephthalate, or polyethylene terephthalate such as copolymerized polyethylene terephthalate obtained by copolymerizing ethylene glycol, terephthalic acid, and a third component, glycol-modified polyethylene terephthalate, or polybutylene terephthalate (PBT). It is also preferable that the reinforcing layer RL contains only a polyester-based resin or polybutylene terephthalate as the resin component.

[0027] From the perspective of recyclability, the polyester resin of the reinforcing layer RL is preferably homopolyethylene terephthalate, or polyethylene terephthalate such as copolyethylene terephthalate obtained by copolymerizing ethylene glycol, terephthalic acid, and a third component, or glycol-modified polyethylene terephthalate, and more preferably homopolyethylene terephthalate. From the perspective of reducing environmental impact, it is preferable that the polyester resin in the reinforcing layer RL is made of recycled raw materials or biomass raw materials. However, from the perspective of reducing the manufacturing cost of the cylindrical body 10 and the end seal portion 30 described later, it is also preferable that the polyester resin in the reinforcing layer RL is made of virgin raw materials.

[0028] From the perspective of further suppressing the breakage of the tube container 1 when the tube container 1 falls, it is also preferable that the polyester resin of the reinforcing layer RL is polybutylene terephthalate. Polybutylene terephthalate has a lower melting point and glass transition temperature compared to polyethylene terephthalate. However, polybutylene terephthalate has a higher impact strength compared to polyethylene terephthalate. Therefore, by adopting polybutylene terephthalate as the polyester resin of the reinforcing layer RL, it is possible to further suppress the breakage of the tube container 1 when it falls while improving the recyclability of the tube container 1. In addition, a film containing polybutylene terephthalate is superior in refractive resistance compared to a film containing polyethylene terephthalate. Therefore, by including polybutylene terephthalate as the polyester resin of the reinforcing layer RL, it is possible to suppress the formation of pinholes in the tube container 1 when a fold line is formed by squeezing the tube container 1 or the like. Furthermore, a film containing polybutylene terephthalate has a higher rigidity (specifically, tensile elastic modulus, etc.) compared to a film containing polyamide. As a result, since the reinforcing layer RL does not contain a polyamide-based resin but contains polybutylene terephthalate, hot air welding for forming the end seal portion 30 becomes easier.

[0029] Examples of the polyolefin resin of the reinforcing layer RL include polyethylene, polypropylene, cyclic olefin polymer, etc. From the viewpoint of recyclability, the polyolefin resin of the reinforcing layer RL is preferably polypropylene. The polyolefin resin may be polyethylene.

[0030] Examples of the polyamide resin of the reinforcing layer RL include aliphatic polyamides such as polyamide 6 (nylon 6), polyamide 66 (nylon 66), polyamide 610 (nylon 610), polyamide 10 (nylon 10), polyamide 12 (nylon 12), polyamide 6-12 (nylon 6-12) and their copolymers, and semi-aromatic polyamides synthesized from aromatic dicarboxylic acids and aliphatic diamines. The polyamide resin is preferably polyamide 6 (nylon 6) or polyamide 66 (nylon 66) which is relatively easy to handle.

[0031] Films containing polyamide resins such as nylon 6 and nylon 66 have higher drop strength compared to polyester resins such as polyethylene terephthalate. Therefore, by including a polyamide resin in the reinforcing layer RL, it is possible to further suppress the breakage of the tube container 1 when it falls. In addition, films containing polyamide resins such as nylon 6 and nylon 66 are superior in refraction resistance compared to films containing polyester resins such as polyethylene terephthalate. Therefore, by including a polyamide resin in the reinforcing layer RL, it is possible to suppress the formation of pinholes in the tube container 1 when a fold line is formed by squeezing the tube container 1 etc.

[0032] The film constituting the reinforcing layer RL is preferably a biaxially stretched film. Thereby, while keeping the cylindrical body portion 10 tough, the radial thickness can be made thinner. Further, when the sheet S includes the barrier layer BL described later, the fact that the film constituting the reinforcing layer RL is a biaxially stretched film can suppress cracks in the barrier layer BL or the like. The reinforcing layer RL may be a single-layer film or may be a part of a laminated film. When the reinforcing layer RL is a part of a laminated film, the reinforcing layer RL may be configured as one layer of the laminated film together with the first base material layer SL1, or may be directly laminated on the first base material layer SL1 without an adhesive layer or the like in between. In addition, in the present embodiment, further, since the reinforcing layer RL is a biaxially stretched film, the formation of the end seal portion 30 becomes easy.

[0033] The reinforcing layer RL is preferably composed of a biaxially stretched film containing a polyester-based resin as a main component. Thereby, while keeping the cylindrical body portion 10 tough, the radial thickness can be made thinner, and the recyclability of the tube container 1 is improved.

[0034] The reinforcing layer RL may be a biaxially stretched film containing polyethylene terephthalate. Thereby, the recyclability of the tube container 1 is further improved. Furthermore, compared with the case where the reinforcing layer RL is a biaxially stretched film containing nylon 6 or nylon 66, the rigidity (specifically, tensile elastic modulus, etc.) becomes larger, so that the formation of the end seal portion 30 becomes even easier.

[0035] The reinforcing layer RL is preferably a biaxially stretched film containing polybutylene terephthalate. Thereby, compared with the case where the reinforcing layer RL is a biaxially stretched film containing polyethylene terephthalate, the drop strength of the tube container 1 can be improved and pinhole formation can be suppressed. Also, compared with the case where the reinforcing layer RL is a biaxially stretched film containing nylon 6 or nylon 66, the rigidity (specifically, tensile elastic modulus, etc.) becomes larger, so that the formation of the end seal portion 30 becomes easy and the recyclability of the tube container 1 is also improved. From the viewpoint of recyclability, it is more preferable that the reinforcing layer RL contains only polybutylene terephthalate as the resin component.

[0036] That is, since the reinforcing layer RL is a biaxially stretched film containing polybutylene terephthalate, the recyclability, drop strength, suppression of pinhole formation, and ease of formation of the end seal portion 30 of the tube container 1 can be improved in a well-balanced manner. As a result, the thickness of the reinforcing layer RL can be made thinner, and the thickness of the cylindrical body portion 10 (sheet S) can also be made thinner.

[0037] In addition, it is also preferable that the reinforcing layer RL is a biaxially stretched film containing nylon 6 or nylon 66. Thereby, compared with the case where the reinforcing layer RL is a biaxially stretched film containing polyethylene terephthalate, the drop strength of the tube container 1 can be improved and pinhole formation can be suppressed.

[0038] The sheet S may include a plurality of reinforcing layers RL. For example, the sheet S may include two or more, or three or more, reinforcing layers RL. From the perspective of reducing the thickness of the sheet S, it is preferable that the sheet S includes one, two, or three reinforcing layers RL. At least one of the plurality of reinforcing layers RL may be a biaxially stretched film. However, it is preferable that each of all the reinforcing layers RL is a biaxially stretched film. The plurality of reinforcing layers RL all contain the resin components that can be included in the above-described reinforcing layer RL. The resin components included in the plurality of reinforcing layers RL may be the same as each other or different from each other among the plurality of reinforcing layers RL.

[0039] In the present embodiment, the sheet S further includes a barrier layer BL. The barrier layer BL is located on the first base material layer SL1 side when viewed from the reinforcing layer RL, but may be located on the side opposite to the first base material layer SL1 when viewed from the reinforcing layer RL. Note that the sheet S may not include the barrier layer BL.

[0040] The material constituting the barrier layer BL is not particularly limited. Examples of the barrier layer BL include ceramic barrier layers such as silica barrier layers or alumina barrier layers, or metal barrier layers such as aluminum barrier layers. The ceramic barrier layer can be a transparent vapor deposition layer. In the present embodiment, the barrier layer BL is laminated on the reinforcing layer RL (specifically, the film constituting the reinforcing layer RL) by vapor deposition.

[0041] The sheet S may include a plurality of barrier layers BL. In this case, the sheet S may include a plurality of reinforcing layers RL. Each of the plurality of barrier layers BL may be laminated on the plurality of reinforcing layers RL by vapor deposition. The sheet S may simultaneously include one or more reinforcing layers RL on which the barrier layer BL is vapor-deposited and one or more reinforcing layers RL on which the barrier layer BL is not vapor-deposited. For example, the sheet S may include both a ceramic barrier layer and a metal barrier layer as the plurality of barrier layers BL, or may include two ceramic barrier layers.

[0042] In this embodiment, the sheet S further includes a second base material layer SL2. The second base material layer SL2 is laminated on the side opposite to the first base material layer SL1 when viewed from the reinforcing layer RL. The second base material layer SL2 is located on the outer side in the radial direction of the cylindrical body portion 10 when viewed from the first base material layer SL1 and the reinforcing layer RL. The second base material layer SL2 may be located between the first base material layer SL1 and the reinforcing layer RL.

[0043] Note that the sheet S may further include another layer between the first base material layer SL1 and the second base material layer SL2. The sheet S may further include another layer between the reinforcing layer RL and the second base material layer SL2. The sheet S may not include the second base material layer SL2.

[0044] In this embodiment, the second base material layer SL2 contains a resin component as a main component. For example, it may contain a polyolefin-based resin or a polyester-based resin as a main component. The second base material layer SL2 may contain a polyester-based resin as the resin component, similar to the first base material layer SL1, or may contain a polyester-based resin, a polyolefin-based resin, or a polyamide-based resin that can be adopted as the resin component of the reinforcing layer RL. When the second base material layer SL2 is laminated on the side opposite to the first base material layer SL1 when viewed from the reinforcing layer RL, from the viewpoint of the adhesiveness between the sheets S at the welded portion 12, it is preferable that the second base material layer SL2 contains a resin component of the same type as the main component of the first base material layer SL1 as a main component. Thereby, at the welded portion 12, the first base material layer SL1 and the second base material layer SL2 are welded to each other, and the bonding strength between the sheets S at the welded portion 12 can be further improved. From the viewpoint of recyclability, it is also preferable that the second base material layer SL2 contains a polyester-based resin as a main component, similar to the first base material layer SL1.

[0045] The polyester resin that can be adopted as the main component of the second base material layer SL2 is preferably polyethylene terephthalate or glycol-modified polyethylene terephthalate, and more preferably homopolyethylene terephthalate. From the perspective of reducing environmental impact, it is preferable that the polyester resin in the second base material layer SL2 is made of recycled raw materials or biomass raw materials. However, from the perspective of reducing the manufacturing cost of the cylindrical body portion 10, it is also preferable that the polyester resin in the second base material layer SL2 is made of virgin raw materials.

[0046] The second base material layer SL2 may be a single-layer film or a part of a laminated film. The film (single-layer film or laminated film) constituting the second base material layer SL2 may be composed of any of an unstretched film, a uniaxially stretched film, or a biaxially stretched film. From the perspective of the adhesiveness between the sheets S in the cylindrical body portion 10 (that is, the ease of welding between the first base material layer SL1 and the second base material layer SL2 at the welded portion 12), the second base material layer SL2 is preferably composed of an unstretched film or a uniaxially stretched film, and more preferably composed of an unstretched film. If the second base material layer SL2 is composed of an unstretched film, the crystallization of the surface of the second base material layer SL2 is suppressed, so the weldability with other layers is improved when ultrasonic welding is performed. It is particularly preferable that the second base material layer SL2 contains a polyester resin as the main component and is composed of an unstretched film.

[0047] The second base material layer SL2 is preferably the outermost layer of the sheet S, and at least preferably the outermost layer of the sheet S at the welded portion 12 and the end seal portion 30. Therefore, when the sheet S includes one or more reinforcing layers RL and one or more barrier layers BL, the one or more reinforcing layers RL and the one or more barrier layers BL are arranged between the first base material layer SL1 and the second base material layer SL2 in the stacking direction of the sheet S in the sheet S.

[0048] As shown in FIG. 8, in the present embodiment, the sheet S further includes a plurality of adhesive layers AL. The plurality of adhesive layers AL are respectively located between the first base material layer SL1 and the barrier layer BL, and between the second base material layer SL2 and the reinforcing layer RL. More specifically, each adhesive layer AL joins the first base material layer SL1 and the barrier layer BL to each other, and joins the second base material layer SL2 and the reinforcing layer RL to each other. When the barrier layer BL is not located between the first base material layer SL1 and the reinforcing layer RL, the adhesive layer AL joins the first base material layer SL1 and the reinforcing layer RL to each other. The adhesive constituting the adhesive layer AL is not particularly limited, but it is preferable to use an adhesive for dry lamination. As the adhesive for dry lamination, conventionally known ones can be used.

[0049] The sheet S may further include a printing layer for improving the design. The printing layer may be located between any layers as long as it is located radially outside the first base material layer SL1 which is the innermost layer of the cylindrical body portion 10. For example, it may be located on the side opposite to the first base material layer SL1 when viewed from the reinforcing layer RL, may be located between the first base material layer SL1 and the reinforcing layer RL, or may be located on the side opposite to the reinforcing layer RL when viewed from the first base material layer SL1. The printing layer may be located on the side opposite to the reinforcing layer RL when viewed from the second base material layer SL2, or may be located between the second base material layer SL2 and the reinforcing layer RL. It is preferable that the printing layer is located on the side opposite to the reinforcing layer RL when viewed from the second base material layer SL2.

[0050] It is also preferable that the sheet S does not include the printing layer at the welded portion 12. Thereby, it is possible to suppress the printing layer from melting during welding of the welded portion 12 and the beauty of the tube container 1 from deteriorating. It is also preferable that the sheet S does not include the printing layer at the end seal portion 30 described later. Thereby, it is possible to suppress the printing layer from melting during welding related to the end seal portion 30 and the beauty of the tube container 1 from deteriorating.

[0051] The printing layer is made of, for example, ink. Examples of the ink include oil-based ink (including solvent-based ink using an organic solvent as a solvent), water-based ink (including emulsion ink of a water-dispersed system), or UV-curable ink, etc.

[0052] The sheet S may further include an anchor coat layer. The anchor coat layer is located between the printing layer and another layer. The anchor coat layer enhances the adhesiveness between the printing layer and another layer. The anchor coat layer can be formed by a conventionally known anchor coating agent or the like.

[0053] When the sheet S includes a printing layer, a transparent protective layer may be further laminated on the printing layer. The transparent protective layer may be, for example, a resin film such as a polypropylene film, or a layer made of transparent ink.

[0054] The sheet S may further include a heat insulation layer. The heat insulation layer may be disposed between the first base material layer SL1 and the second base material layer SL2. Thereby, it is possible to suppress the heat applied to the first base material layer SL1 for forming the end seal portion 30 from being transmitted to the second base material layer SL2. The heat insulation layer may be disposed between the first base material layer SL1 and the reinforcing layer RL. Thereby, it is possible to suppress the above heat from being transmitted to the reinforcing layer RL. The heat insulation layer preferably has a lower thermal conductivity than that of the first base material layer SL1. Thus, even a relatively thin heat insulation layer in thickness can effectively suppress the above heat from being transmitted to the second base material layer SL2 or the like. The heat insulation layer may be a metal layer such as aluminum, but from the viewpoint of effectively suppressing heat conduction as described above, the heat insulation layer is preferably composed of a foam material made of a resin component such as polyethylene terephthalate.

[0055] The sheet S constituting the cylindrical body portion preferably has a polyester-based resin content of 85% by mass or more, and more preferably 90% by mass or more, as a whole.

[0056] The total thickness of the sheet S is preferably, for example, 12 μm or more and 250 μm or less from the viewpoints of forming the sheet S into a tubular shape and the handleability of the tube container 1. Thereby, when the tubular body 10 is used as a part of the container, squeezability that allows the contents accommodated in the container to be extruded and poured out can be imparted to the tubular body 10. Further, since the sheet S includes the first base material layer SL1 containing a polyester-based resin, when the total thickness of the sheet S is 12 μm or more and 250 μm or less, a score line extending in the axial direction DA can be easily formed in the tubular body 10. Thereby, better squeezability can be imparted by the tubular body 10. From the viewpoint of ensuring a desired drop strength or the like, the total thickness of the sheet S is preferably 100 μm or more, and more preferably 120 μm or more.

[0057] The first base material layer SL1 is the innermost layer of the tubular body 10, and is preferably at least thicker than the reinforcing layer RL from the viewpoint of always adhering to other layers during welding of the welded portion 12. Thereby, the influence of the resin component contained in the reinforcing layer RL on the welding strength between the sheets S can be reduced during welding at the welded portion 12. From the viewpoint of further reducing the influence, the thickness of the first base material layer SL1 is preferably 1.5 times or more, more preferably 3 times or more, and even more preferably 5 times or more the thickness of the reinforcing layer RL. The first base material layer SL1 may be the thickest layer in the sheet S. In this specification, the thickness of the sheet S and the layers constituting the same refers to the thickness of the sheet S and the layers constituting the same before forming the tubular body 10, and corresponds to the radial thickness of the layer constituting the extending portion 113 (details will be described later) in the sheet base portion 11 in the tubular body 10.

[0058] The thickness of the first base material layer SL1 is preferably, for example, 10 μm or more and 250 μm or less, and more preferably 60 μm or more and 80 μm or less. When the sheet S includes the second base material layer SL2, the thickness of the first base material layer SL1 is preferably 10 μm or more and 80 μm or less. The thickness of the first base material layer may be, for example, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm.

[0059] The thickness of the reinforcing layer RL is preferably, for example, 5 μm or more and 200 μm or less, and more preferably 5 μm or more and 100 μm or less. From the viewpoint of reducing the total thickness of the sheet S, the thickness of the reinforcing layer may be, for example, 5 μm or more and 25 μm or less. When the sheet S includes a plurality of reinforcing layers RL, the thickness of each of the plurality of reinforcing layers RL is preferably 5 μm or more and 25 μm or less. When a barrier layer BL is deposited on the reinforcing layer RL, the total thickness of the reinforcing layer RL and the barrier layer BL may be 5 μm or more and 25 μm or less. The total thickness of the reinforcing layer RL and the barrier layer BL may be, for example, 12 μm or 25 μm.

[0060] The thickness of the second base material layer SL2 is preferably, for example, 10 μm or more and 250 μm or less. The thickness of the second base material layer SL2 is also preferably, for example, 5 μm or more and 200 μm or less, more preferably 5 μm or more and 100 μm or less, and even more preferably 60 μm or more and 80 μm or less. The thickness of the second base material layer SL2 may be, for example, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm. The thickness of the second base material layer SL2 may be the same as that of the first base material layer SL1. Thereby, it becomes possible to form the second base material layer SL2 with the same film as the film constituting the first base material layer SL1. Note that the thickness of the second base material layer SL2 may be different from the thickness of the first base material layer SL1. It is also preferable that the thickness of the second base material layer SL2 is greater than the thickness of the first base material layer SL1. When the thickness of the second base material layer SL2 is greater than the thickness of the first base material layer SL1, the sheet S is likely to curl in a concave shape on the side of the first base material layer SL1, and the formation of the sheet S into a cylindrical shape becomes easier. The second base material layer SL2 may be the thickest layer in the sheet S. The second base material layer SL2 is preferably thicker than the reinforcing layer RL.

[0061] As shown in FIG. 8, when the sheet S includes a single reinforcing layer RL and a barrier layer BL, from the viewpoint of recyclability, it is preferable that the first base material layer SL1, the reinforcing layer RL, and the second base material layer SL2 all contain a polyester-based resin. More specifically, it is preferable that the first base material layer SL1 and the second base material layer SL2 contain polyethylene terephthalate, and the reinforcing layer RL contains polyethylene terephthalate or polybutylene terephthalate. When the sheet S includes a single reinforcing layer RL and a barrier layer BL, for example, the thickness of the first base material layer SL1 may be approximately 90 μm, the total thickness of the reinforcing layer RL and the barrier layer BL may be approximately 12 μm, and the thickness of the second base material layer SL2 may be approximately 90 μm.

[0062] FIG. 9 is a partial cross-sectional view of a sheet in a modified example of an embodiment of the present invention. As shown in FIG. 8, the sheet Sa may include a three-layer reinforcing layer RL, namely, a first reinforcing layer RL1, a second reinforcing layer RL2, and a third reinforcing layer RL3. All of these layers are preferably biaxially stretched films.

[0063] The first reinforcing layer RL1, the second reinforcing layer RL2, and the third reinforcing layer RL3 are arranged in this order in the direction from the first base material layer SL1 to the second base material layer SL2. From the viewpoint of recyclability, it is preferable that one of the first reinforcing layer RL1, the second reinforcing layer RL2, and the third reinforcing layer RL3 is a biaxially stretched film containing a polyester-based resin, and it is more preferable that two of these layers are biaxially stretched films containing a polyester-based resin. For example, it is even more preferable that both the first reinforcing layer RL1 and the third reinforcing layer RL3 are biaxially stretched films containing a polyester-based resin, and it is even more preferable that they are biaxially stretched films containing polyethylene terephthalate or polybutylene terephthalate. The second reinforcing layer RL2 is not particularly limited, but it may also be a biaxially stretched film containing a polyamide-based resin such as nylon 6 or nylon 66.

[0064] The first reinforcing layer RL1 is joined to the first base material layer SL1 and the second reinforcing layer RL2 via adhesive layers AL formed on both sides in the laminating direction of the sheet Sa. The second reinforcing layer RL2 is joined to the third reinforcing layer RL3 via the adhesive layer AL. The third reinforcing layer RL3 is joined to the second base material layer SL2 via the adhesive layer AL. For each reinforcing layer RL, when a barrier layer is vapor-deposited on the reinforcing layer RL, the reinforcing layer RL may be joined to other layers via the vapor-deposited barrier layer and the adhesive layer AL formed on the barrier layer.

[0065] As in this modified example, when the sheet S includes three reinforcing layers RL, for example, the thickness of the first base material layer SL1 may be 60 μm, the thickness of the first reinforcing layer RL1 (or the total thickness of the first reinforcing layer RL1 and the barrier layer vapor-deposited thereon) may be 12 μm, the thickness of the second reinforcing layer RL2 may be 15 μm, the thickness of the third reinforcing layer RL3 (or the total thickness of the third reinforcing layer RL3 and the barrier layer vapor-deposited thereon) may be 12 μm, and the thickness of the second base material layer SL2 may be 60 μm.

[0066] FIG. 10 is a partial cross-sectional view of a sheet in another modified example of the embodiment of the present invention. As shown in FIG. 10, the sheet Sb may include a first reinforcing layer RL1 and a second reinforcing layer RL2 as two reinforcing layers RL. In this case, considering the formation of the end seal portion 30 described later, at least one of the first reinforcing layer RL1 and the second reinforcing layer RL2 is preferably a biaxially stretched film containing polybutylene terephthalate. Considering recyclability, the other of the first reinforcing layer RL1 and the second reinforcing layer RL2 is preferably a biaxially stretched film containing polyethylene terephthalate. For example, the first reinforcing layer RL1 may be a biaxially stretched film containing polybutylene terephthalate, and the second reinforcing layer RL2 may be a biaxially stretched film containing polyethylene terephthalate. The thickness of the first base material layer SL1 may be 60 μm, the thickness of the first reinforcing layer RL1 (or the total thickness of the first reinforcing layer RL1 and the barrier layer vapor-deposited thereon) may be 12 μm, the thickness of the second reinforcing layer RL2 may be 15 μm (or the total thickness of the second reinforcing layer RL2 and the barrier layer vapor-deposited thereon) may be 12 μm, and the thickness of the second base material layer SL2 may be 60 μm.

[0067] Next, the details of the sheet base portion 11 and the welded portion 12 will be described. FIG. 11 is a partial cross-sectional view of the cylindrical body portion in FIG. 4 as viewed from the direction of the arrow along line XI-XI. As shown in FIGS. 1 to 4, FIG. 6, and FIG. 11, the sheet base portion 11 has a first base end portion 111, a second base end portion 112, and an extending portion 113.

[0068] The first base end portion 111 is a portion that is continuous with the second side end portion SE2 in the sheet S. The second base end portion 112 is a portion that is continuous with the first side end portion SE1 in the sheet S. The first base end portion 111 and the second base end portion 112 each extend from one end portion 13 to the other end portion 14 of the cylindrical body portion 10 along the welded portion 12 (see FIGS. 4 and 6).

[0069] The average thicknesses of the first base end portion 111 and the second base end portion 112 are different from the thickness of the sheet S in the state before forming the cylindrical body portion 10 (the radial thickness of the extending portion 113).

[0070] The first base end portion 111 and the second base end portion 112 may each have both a portion thicker and a portion thinner in the radial direction than the thickness of the sheet S before forming the cylindrical body portion 10, or may be composed of only the thicker portion or only the thinner portion. For example, in the cross-sectional view shown in FIG. 11, the radial thickness of the first base end portion 111 is thicker than the thickness of the sheet S in the state before forming the cylindrical body portion 10 (the radial thickness of the extending portion 113). Also, the second base end portion 112 has a portion thinner in the radial direction and a portion thicker than the thickness of the sheet S in the state before forming the cylindrical body portion 10 (the radial thickness of the extending portion 113).

[0071] The extending portion 113 is a portion located between the first base end portion 111 and the second base end portion 112 in the plane direction DP of the sheet S (the circumferential direction DC of the cylindrical body portion 10) (see FIG. 6). The extending portion 113 has a substantially C-shaped outer shape when viewed from the axial direction DA of the cylindrical body portion 10. The thickness of the extending portion 113 in the radial direction of the cylindrical body portion 10 is equal to the thickness of the sheet S before forming the cylindrical body portion 10.

[0072] The belt-shaped welded portion 12 is formed by bending or curving the sheet S and welding the first side end portion SE1 and the second side end portion SE2 so as to overlap each other in the thickness direction of the sheet S. In the present embodiment, the outer peripheral surface of the first side end portion SE1 and the inner peripheral surface of the second side end portion SE2 are welded to each other (see FIG. 6). The welded portion 12 extends along the axial direction DA of the cylindrical body portion 10 (see FIG. 4). The welded portion 12 continuously extends from one end portion 13 to the other end portion 14.

[0073] The welded portion 12 has a first tip edge 121, a second tip edge 122, a welded portion outer peripheral surface 123, and a welded portion inner peripheral surface 124.

[0074] As shown in FIG. 11, the first tip edge 121 is the tip edge of the first side end portion SE1 in the circumferential direction DC of the cylindrical body portion 10. The first tip edge 121 is joined to the first base end portion 111. Thereby, the welding area of the welded portion 12 becomes relatively large. Consequently, when a peeling stress is applied to the welded portion 12, the stress is dispersed. Therefore, the welding strength of the welded portion 12 is improved.

[0075] In the present embodiment, at the first tip edge 121, there is a boundary between the first base material layer SL1 of the first side end portion SE1 and the first base material layer SL1 of the first base end portion 111, but this boundary may not exist. That is, the first base material layer SL1 of the first side end portion SE1 and the first base material layer SL1 of the first base end portion 111 may melt with each other and be continuous in the circumferential direction DC.

[0076] Furthermore, the first tip edge 121 is located within the thickness of the first base end portion 111 when viewed from the direction along the circumferential direction DC. Thereby, the chance of the first tip edge 121 coming into contact with an external object can be reduced. In particular, in the present embodiment, the outer peripheral surface of the first side end portion SE1 and the inner peripheral surface of the second side end portion SE2 are welded to each other to form a welded portion 12 (see FIG. 6). Therefore, since the first tip edge 121 is located within the thickness of the first base end portion 111 when viewed from the direction along the circumferential direction DC, the chance of the content of the tube container 1 coming into contact with the first tip edge 121 can be reduced. At this time, at least a part of the first tip edge 121 may be located within the thickness of the first base end portion 111 when viewed from the direction along the circumferential direction DC. However, as shown in FIG. 11, it is most preferable that the entire first tip edge 121 is located within the thickness of the first base end portion 111 when viewed from the direction along the circumferential direction DC.

[0077] Also, the first interlayer portion SB1 between the first base material layer SL1 and the one or more reinforcing layers RL in the first side end portion SE1 is in contact with the first base end portion 111 within the thickness of the first base end portion 111 when viewed from the direction along the circumferential direction DC. Thereby, it becomes difficult for the content of the tube container 1 to come into contact with the first interlayer portion SB1 between the first base material layer SL1 and the one or more reinforcing layers RL in the first side end portion SE1. As a result, the occurrence of delamination between the first base material layer SL1 and the one or more reinforcing layers RL due to the content coming into contact with the first interlayer portion SB1 can be suppressed.

[0078] Referring to FIG. 6, it is schematically shown that an interface surface between the first side end portion SE1 and the second side end portion SE2 is formed. However, in the present embodiment, actually, referring to FIG. 11, the second base material layer SL2 of the first side end portion SE1 and the first base material layer SL1 of the second side end portion SE2 are melted together to form an integral layer ML. Therefore, at least the first side end portion SE1 and the second side end portion SE2 do not clearly form an interface surface along the circumferential direction DC. Details of the integral layer ML will be described later.

[0079] The first tip edge 121 extends from one end 13 to the other end 14 in the axial direction DA of the cylindrical body portion 10 (see FIG. 4).

[0080] As shown in FIG. 11, the second tip edge 122 is the tip edge in the circumferential direction DC of the second side end portion SE2. The second tip edge 122 is joined to the second base end portion 112. As a result, the welding area of the welded portion 12 becomes relatively large. Consequently, when a peeling stress is applied to the welded portion 12, this stress is dispersed.

[0081] In addition, in the present embodiment, at the second tip edge 122, there is a boundary between the second base material layer SL2 of the second side end portion SE2 and the second base material layer SL2 of the second base end portion 112, but this boundary may not be present. That is, the second base material layer SL2 of the second side end portion SE2 and the second base material layer SL2 of the second base end portion 112 may be melted with each other and continuous in the circumferential direction DC.

[0082] Furthermore, the second tip edge 122 is located within the thickness of the second base end portion 112 when viewed from the direction along the circumferential direction DC. Thereby, the chance of the second tip edge 122 coming into contact with an external object can be reduced. At this time, at least a part of the second tip edge 122 may be located within the thickness of the second base end portion 112 when viewed from the direction along the circumferential direction DC. However, as shown in FIG. 11, it is most preferable that the entire second tip edge 122 is located within the thickness of the second base end portion 112 when viewed from the direction along the circumferential direction DC.

[0083] Also, the second layer interface SB2 between one or a plurality of reinforcing layers RL and the second base material layer SL2 at the second side end portion SE2 is in contact with the second base end portion 112 within the thickness of the second base end portion 112 when viewed from the direction along the circumferential direction DC. Thereby, it becomes difficult for other objects located outside the cylindrical body portion 10 to come into contact with the second layer interface SB2. Consequently, the occurrence of delamination between one or a plurality of reinforcing layers RL and the second base material layer SL2 due to the contact of the above-mentioned other objects with the second layer interface SB2 can be suppressed.

[0084] The second tip edge 122 extends from one end 13 to the other end 14 in the axial direction DA of the cylindrical body portion 10 (see FIG. 4).

[0085] Next, the integrated layer ML will be described. As shown in FIG. 11, the integrated layer ML is a layer formed as one layer by the fusion of the second base material layer SL2 at the first side end SE1 and the first base material layer SL1 at the second side end SE2. For this reason, the first side end SE1 and the second side end SE2 are firmly connected to each other.

[0086] The integrated layer ML is welded to the first base material layer SL1 of the first base end portion 111. Specifically, the integrated layer ML does not form a boundary with the first base material layer SL1 of the first base end portion 111 and is continuous with the first base material layer SL1 of the first base end portion 111 in the circumferential direction DC. Thereby, the integrated layer ML is firmly connected to the first base material layer SL1 of the first base end portion 111. Further, the integrated layer ML is welded to the second base material layer SL2 of the second base end portion 112. Specifically, the integrated layer ML does not form a boundary with the second base material layer SL2 of the second base end portion 112 and is continuous with the second base material layer SL2 of the second base end portion 112 in the circumferential direction DC. Thereby, the integrated layer ML and the second base material layer SL2 of the second base end portion 112 are firmly connected to each other.

[0087] As shown in FIG. 11, the outer peripheral surface 123 of the welded portion faces the outside in the radial direction of the cylindrical body portion 10. The outer peripheral surface 123 of the welded portion is constituted by the second side end SE2. Concavities and convexities are formed on the outer peripheral surface 123 of the welded portion. That is, concavities and convexities are formed on the second side end SE2 on the outside in the radial direction. By forming concavities and convexities on the outer peripheral surface 123 of the welded portion, the discriminability by touch can be enhanced, and the cylindrical body portion 10 is less likely to slip off when the cylindrical body portion 10 is gripped.

[0088] In the welding portion 12, unevenness is formed over the entire circumferential direction DC of the outer peripheral surface 123 of the welding portion from one end portion 13 to the other end portion 14 of the cylindrical body portion 10 (see FIGS. 4 and 11). And in the welding portion 12 (the second side end portion SE2), the second interlayer portion SB2 between the one or more reinforcing layers RL and the second base material layer SL2 extends along the uneven shape of the outer peripheral surface 123 of the welding portion (see FIG. 11).

[0089] In the present embodiment, the convex portions 125 in the unevenness formed on the outer peripheral surface 123 of the welding portion are formed in a lattice shape when viewed in the radial direction of the cylindrical body portion 10 (see FIG. 4). However, the shape of the convex portion 125 when viewed in the radial direction of the cylindrical body portion 10 is not particularly limited. Recessed portions may be formed in a lattice shape on the outer peripheral surface 123 of the welding portion. By the convex portions 125 or the recessed portions in the unevenness formed on the outer peripheral surface 123 being formed in a lattice shape, the welding area between the first side end portion SE1 and the second side end portion SE2 can be increased in any direction along the circumferential direction DC and the axial direction DA of the cylindrical body portion 10.

[0090] The convex portions 125 or the recessed portions may be formed in a plurality of dot shapes or in a plurality of linear shapes parallel to each other when viewed in the radial direction of the cylindrical body portion 10. Also, the height dimension of the convex portion 125 in the unevenness formed on the outer peripheral surface 123 of the welding portion is larger than the dimension of the thickness of the sheet S (the thickness of 113) before the formation of the cylindrical body portion 10. And the height dimension of the convex portion 125 in the unevenness formed on the outer peripheral surface 123 of the welding portion is preferably 1.1 times or more, more preferably 1.2 times or more, and still more preferably 1.5 times or more the dimension of the thickness of the sheet S (the thickness of the extending portion 113) before the formation of the cylindrical body portion 10. The larger the height dimension of the convex portion 125, the longer the length in the direction along the circumferential direction DC of the second interlayer portion SB2 extending along the shape of the unevenness, the peeling stress applied to the welding portion 12 is dispersed, and the strength of the welding portion 12 is improved.

[0091] On the other hand, the inner peripheral surface 124 of the welding portion faces the inner side in the radial direction of the cylindrical body portion 10. The inner peripheral surface 124 of the welding portion is smooth along the circumferential direction DC.

[0092] Since it has the outer peripheral surface 123 and the inner peripheral surface 124 of the welded part as described above, the welded part 12 has a portion with a relatively thick radial thickness (the portion where the convex part 125 is located) and a portion with a relatively thin radial thickness. In the welded part 12, the radial thickness dimension of the thickest portion in the radial direction is, for example, more than 1.5 times and not more than 3 times the radial thickness dimension of the extending part 113 of the sheet base 11 (that is, the thickness dimension of the sheet S before the first side end SE1 and the second side end SE2 are welded to each other). In the welded part 12, the radial thickness dimension of the thinnest portion in the radial direction is, for example, not less than 0.3 times and not more than 1.5 times the radial thickness dimension of the extending part 113 of the sheet base 11 (that is, the thickness dimension of the sheet S before the first side end SE1 and the second side end SE2 are welded to each other).

[0093] In addition, in the present embodiment, although the concavo-convex shape is formed on the outer peripheral surface 123 of the welded part, the concavo-convex shape may be formed on the inner peripheral surface 124 of the welded part. When the concavo-convex shape is formed on the inner peripheral surface 124 of the welded part, the convex part of the concavo-convex shape can have the same configuration as the convex part 125 described above. In this case, in the welded part 12 (the first side end SE1), the first interlayer part SB1 between the first base material layer SL1 and the one or more reinforcing layers RL may extend along the concavo-convex shape of the inner peripheral surface 124 of the welded part. Further, in this case, the outer peripheral surface 123 of the welded part may be smooth along the circumferential direction DC.

[0094] As shown in FIGS. 1 to 5, one end portion 13 is joined to the pouring portion 20 in the axial direction DA of the cylindrical body portion 10. By being joined to the pouring portion 20, the one end portion 13 is configured to have no flexibility and to be able to maintain its outer shape. The inner peripheral surface 131 of the one end portion 13 is joined to the pouring portion 20 (see FIG. 5).

[0095] The one end portion 13 has an annular outer shape when viewed in the axial direction DA of the cylindrical body portion 10. The one end portion 13 may have an elliptical annular or polygonal annular outer shape when viewed in the axial direction DA of the cylindrical body portion 10.

[0096] One end portion 13 in the axial direction DA of the cylindrical body portion 10 is composed of one end portion of the sheet base portion 11 and one end portion of the welded portion 12 in the axial direction DA. Also in the one end portion 13, it is preferable that the first tip edge 121 (see FIG. 11) is positioned within the thickness of the first base end portion 111 when viewed from the direction along the circumferential direction DC. Thereby, the inner peripheral surface 131 becomes relatively smooth in the vicinity of the first tip edge 121 of the one end portion 13, and the inner peripheral surface 131 of the one end portion 13 can be easily joined to the casting portion 20.

[0097] Further, in the present embodiment, also in the one end portion 13, the inner peripheral surface 124 of the welded portion (see FIG. 11) is smooth along the circumferential direction DC. Therefore, the joining of the inner peripheral surface 131 of the one end portion 13 and the casting portion 20 becomes easy.

[0098] The length along the axial direction DA of the one end portion 13 joined to the casting portion 20 is preferably 3 mm or more, and more preferably 4 mm or more.

[0099] As shown in FIG. 5, one end portion 13 of the cylindrical body portion 10 in the present embodiment extends along the outer shape of the casting portion 20. Therefore, the other configuration of the one end portion 13 will be described together with the description of the casting portion 20 described later.

[0100] The other end portion 14 is located on the opposite side of the one end portion 13. The other end portion 14 in the axial direction DA of the cylindrical body portion 10 extends along a direction orthogonal to the axial direction DA (specifically, a second direction described later). The other end portion 14 is closed by the end seal portion 30. The other end portion 14 extends along the end seal portion 30.

[0101] The main body portion 15 is a portion located between the one end portion 13 and the other end portion 14 of the cylindrical body portion 10. When the main body portion 15 is deformed into a substantially cylindrical shape, the inner diameter of the main body portion 15 may be, for example, 25 mm or more and 60 mm or less.

[0102] As shown in FIGS. 1 to 5, the pouring part 20 is joined to one end part 13 in the axial direction DA of the cylindrical body part 10. Thereby, the pouring part 20 can pour out the content accommodated in the cylindrical body part 10. In the present embodiment, the pouring part 20 also has a shape capable of accommodating the content, and the tube container 1 can accommodate the content in an accommodation space which is a space formed by the cylindrical body part 10 and the pouring part 20.

[0103] FIG. 12 is a partial cross-sectional view showing the pouring part of the tube container according to Embodiment 1 of the present invention and the vicinity thereof. FIG. 13 is a partial cross-sectional view showing an enlarged view of region XIII in FIG. 12. In FIGS. 12 and 13, the cross-section of the tube container 1 is partially shown in the same cross-sectional view as FIG. 5.

[0104] As shown in FIGS. 12 and 13, the pouring part 20 includes a pouring port 21, a shoulder part 22, an extending part 23, and a thick part 24.

[0105] The pouring port 21 is provided so as to face the side opposite to the cylindrical body part 10 side in the pouring part 20 in order to pour out the content. The pouring port 21 extends along the axial direction DA of the cylindrical body part 10 and has a substantially cylindrical outer shape. The pouring port 21 communicates the inside and the outside of the tube container 1 in a state where the cap part 40 is removed from each other.

[0106] The pouring port 21 has a male screw part 211. The male screw part 211 is provided on the outer surface of the pouring port and is configured to be screwable with the cap part 40.

[0107] The shoulder portion 22 extends radially from the discharge port 21 around the discharge port 21 when viewed in the axial direction DA. The shoulder portion 22 extends from the discharge port 21 so as to be inclined with respect to the axial direction DA. The shoulder portion 22 has a frustum shape, and more specifically, a frustum of a cone shape. For this reason, the outer peripheral end 221 of the shoulder portion 22, which is the end portion of the shoulder portion 22 on the radially outer side, is located farthest from the discharge port 21 in the axial direction DA among the shoulder portions 22. Also, the inner surface 222 of the shoulder portion 22 extends in a substantially frustum shape. Specifically, all of them extend in a substantially frustum of a cone shape. The shoulder portion 22 may have an outer shape in which a plurality of substantially frustums of a cone having different apex angles are connected in the axial direction DA. The outer surface 223 of the shoulder portion 22 extends substantially parallel to the inner surface 222. However, among the outer surfaces 223 of the shoulder portion 22, the outer surface 221S of the outer peripheral end 221 is curved. Note that the shoulder portion 22 may extend from the discharge port 21 so as to be orthogonal to the axial direction DA. The thickness of the shoulder portion 22 is preferably, for example, 0.6 mm or more, and preferably 1 mm or more from the viewpoint of improving the dropping strength.

[0108] Note that one end portion 13 of the cylindrical body portion 10 intersects a virtual extension surface VS formed by extending the inner surface 222 of the shoulder portion 22 toward the radially outer side. According to this, when an injection molding is performed on the cylindrical body portion 10 with a resin composition containing a polyester-based resin for forming the discharge portion 20, the resin composition can take a flow path that flows in from the shoulder portion 22 in the order of the extension portion 23. At this time, when the resin composition takes a flow path along the virtual extension surface VS, the resin composition abuts against the inner peripheral surface 131 of one end portion 13 of the cylindrical body portion 10 due to the above configuration. The cylindrical body portion 10 is extruded radially outward by the resin composition. Therefore, it is possible to suppress the resin composition from surrounding the outer peripheral side of the cylindrical body portion 10. As a result, the yield when insert molding the discharge portion 20 so as to be joined to the inner peripheral surface 131 of one end portion 13 of the cylindrical body portion 10 is improved. Therefore, according to the above configuration, it is possible to provide the tube container 1 having excellent recyclability and being less expensive.

[0109] Further, one end portion 13 of the cylindrical body portion 10 extends so as to curve along the outer surface 221S of the outer peripheral end 221. Thereby, when the tube container 1 drops and receives an impact, it is possible to suppress the separation of the cylindrical body portion 10 from the pouring portion 20.

[0110] The one end portion 13 is joined to the outer surface 221S of the outer peripheral end 221. In the present embodiment, the one end portion 13 is joined to the outer peripheral end 221 over the entire curved portion of the outer surface 221S of the outer peripheral end 221.

[0111] The extending portion 23 extends from the outer peripheral end 221 of the shoulder portion 22 along the axial direction DA in the opposite direction to the pouring port 21 side. The extending portion 23 is joined to the inner peripheral surface 131 of one end portion 13 of the cylindrical body portion 10 on the outer side in the radial direction.

[0112] The extending portion 23 includes a base portion 231, a tip 232, and a stepped portion 233. The base portion 231 is a portion joined to a location 13X where it intersects the virtual extension surface VS at one end portion 13 of the cylindrical body portion 10. The tip 232 is the tip of the extending portion 23 in the axial direction DA and is the portion farthest from the shoulder portion 22 in the axial direction DA.

[0113] From the base portion 231 to the tip 232, the thickness of the extending portion 23 in the radial direction is the thickest at the base portion 231. Thereby, when the tube container 1 drops and receives an impact, it is possible to suppress stress from concentrating on the base portion 231 of the extending portion 23. As a result, the drop strength of the tube container 1 can be improved.

[0114] The inner surface 231S of the base portion 231 is curved. When viewed from the circumferential direction DC of the cylindrical body portion 10 (see FIG. 13), the radius of curvature of the inner surface 231S of the base portion 231 is larger than the radius of curvature of the outer surface 221S of the outer peripheral end 221 of the shoulder portion 22. Thereby, the pouring portion 20 becomes relatively thick from the outer peripheral end 221 of the shoulder portion 22 to the base portion 231 of the extending portion 23, and the drop strength of the pouring portion 20 is improved.

[0115] The stepped portion 233 is located between the shoulder portion 22 and the tip 232. The stepped portion 233 is located between the base portion 231 and the tip 232. The stepped portion 233 is formed such that the inner surface of the extending portion 23 bends radially outward as it moves away from the shoulder portion 22 (or the base portion 231). As a result, when the tube container 1 drops and receives an impact, the portion on the tip 232 side from the stepped portion 233 becomes more flexible than the cylindrical body portion 10. Consequently, stress concentration at the contact portion between the tip 232 of the extending portion 23 and the cylindrical body portion 10 can be suppressed. Therefore, the drop strength of the tube container 1 can be improved.

[0116] The stepped portion 233 is formed to extend obliquely with respect to the axial direction DA. The average thickness in the radial direction of the extending portion 23 on the tip 232 side from the stepped portion 233 is thinner than the average thickness in the radial direction of the extending portion 23 on the shoulder 22 side from the stepped portion 233. The average radial thickness of the portion of the extending portion 23 on the tip 232 side from the stepped portion 233 is about 0.3 mm or more and 0.5 mm or less. By being 0.3 mm or more, the occurrence of short shots at the tip 232 during injection molding of the pouring portion 20 can be suppressed. That is, it is possible to suppress a part of the tip 232 of the extending portion 23 from chipping at a plurality of locations.

[0117] The thick-walled portion 24 covers the connection portion between the spout 21 and the shoulder 22 from the outside. Thereby, when the tube container 1 receives an impact such as when it drops, breakage of the connection portion between the spout 21 and the shoulder 22 can be suppressed.

[0118] The pouring portion 20 is further formed with an abutting portion 29. The abutting portion 29 is in contact with the end face 133 on the one end portion 13 side of the cylindrical body portion 10. Thereby, it is possible to suppress the displacement of the cylindrical body portion 10 with respect to the pouring portion 20. The abutting portion 29 is in contact with a part of the end face 133 on the one end portion 13 side of the cylindrical body portion 10, but may be in contact with the entire end face 133. In the present embodiment, the abutting portion 29 is provided on the shoulder portion 22. More specifically, the abutting portion 29 is located on the inner peripheral side of the curved outer surface 221S of the outer peripheral end 221 when viewed from the axial direction DA. Among the outer surface 223 of the shoulder portion 22, the portion on the inner peripheral side of the abutting portion 29 when viewed from the axial direction DA may be substantially flush with the outer peripheral surface 132 of the one end portion 13 of the cylindrical body portion 10.

[0119] The pouring-out part 20 is made of a resin composition containing a polyester-based resin. As the polyester-based resin in the pouring-out part 20, the same one as the polyester-based resin in the first base material layer SL1 can be used. From the viewpoint of the recyclability of the tube container 1, the polyester-based resin of the pouring-out part 20 is preferably polyethylene terephthalate such as homopolyethylene terephthalate, or copolyethylene terephthalate obtained by copolymerizing ethylene glycol, terephthalic acid, and a third component, or glycol-modified polyethylene terephthalate, and more preferably homopolyethylene terephthalate. Further, from the viewpoint of the moldability of the pouring-out part 20, the polyester-based resin in the pouring-out part 20 is preferably an amorphous polyester-based resin (such as amorphous polyethylene terephthalate and glycol-modified polyethylene terephthalate). Note that the polyester-based resin in the pouring-out part 20 may be a crystalline polyester-based resin (for example, crystalline polyethylene terephthalate). From the viewpoint of the recyclability of the tube container 1, it is preferable that the resin composition constituting the pouring-out part 20 contains only the polyester-based resin as a resin component. The resin composition constituting the pouring-out part 20 may further contain conventionally known additives. Further, from the viewpoint of reducing the environmental load, it is preferable that the polyester-based resin in the resin composition is made of a recycled raw material or a biomass-derived raw material, but from the viewpoint of reducing the manufacturing cost of the pouring-out part 20, it is also preferable that the polyester-based resin in the resin composition is made of a virgin raw material.

[0120] In the present embodiment, the pouring-out part 20 is an injection molding member of the above resin composition. Specifically, the pouring-out part 20 is an insert molding member joined to one end portion 13 of the cylindrical body portion 10 by injecting the above resin composition. Details of the molding method of the pouring-out part 20 will be described later. The value of the intrinsic viscosity (IV) of the polyester-based resin material used for molding the pouring-out part 20 may be, for example, 0.60 or more and 0.90 or less when measured in accordance with the JIS standard (K7390-1:2015). If the IV value is 0.60 or more and 0.90 or less, the molding of the pouring-out part 20 becomes easy.

[0121] Next, the end seal portion 30 will be described. As shown in FIGS. 1 to 5, the end seal portion 30 closes the other end portion 14 of the cylindrical body portion 10 in the axial direction DA. In the present embodiment, the end seal portion 30 extends substantially parallel to the second direction D2. The second direction D2 is a direction orthogonal to both the axial direction DA and the first direction D1. The first direction D1 is a direction orthogonal to the axial direction DA. The end seal portion 30 has a flat outer shape.

[0122] FIG. 14 is a schematic cross-sectional view showing the state of the sheet immediately before the end seal portion is formed. In FIG. 14, a cross-sectional view is illustrated in substantially the same cross-sectional view as FIG. 6.

[0123] As shown in FIGS. 1 to 5 and FIG. 14, the end seal portion 30 is formed by further welding the inner peripheral surface of the sheet S, that is, the cylindrical body CB (particularly FIG. 14), which is formed in a cylindrical shape by overlapping and welding the first side end portion SE1 and the second side end portion in the thickness direction of the sheet S, in the first direction D1.

[0124] As shown in FIGS. 1 and 2, the cap portion 40 is detachably attached to the pouring portion 20.

[0125] In the tube container 1 according to Embodiment 1 of the present invention, the cap portion 40 is made of a resin composition. From the viewpoint of the recyclability of the tube container 1, the cap portion 40 preferably comprises a resin composition containing a polyester-based resin as a main component.

[0126] The polyester resin in the cap portion 40 can be the same as the polyester resin in the first base material layer SL1. From the viewpoint of the recyclability of the tube container 1, the polyester resin of the cap portion 40 is preferably homopolyethylene terephthalate, or polyethylene terephthalate such as copolyethylene terephthalate obtained by copolymerizing ethylene glycol, terephthalic acid, and a third component, or glycol-modified polyethylene terephthalate, and more preferably homopolyethylene terephthalate. Further, from the viewpoint of the moldability of the cap portion 40, the polyester resin in the cap portion 40 is preferably an amorphous polyester resin (such as amorphous polyethylene terephthalate and glycol-modified polyethylene terephthalate).

[0127] <Tube container with contents> The tube container with contents includes the tube container 1 and the contents accommodated in the tube container 1 (the cylindrical body portion 10 and the dispensing portion 20). The contents are not particularly limited, but may be those accommodated in a conventionally known tube container. Examples of the contents include cosmetics, foods, pharmaceuticals, or oral compositions. The contents may contain at least one of an oil-soluble compound, an oily component, a volatile oily component, a fragrance, or a sweetener that can be adsorbed by the polyolefin resin, or a surfactant.

[0128] In the tube container 1 according to the present embodiment, since the resin (the first base material layer SL1) that comes into direct contact with the contents is a polyester resin, it is possible to relatively suppress the adsorption of the above components that can be adsorbed by the polyolefin resin to the tube container 1, or the absorption of these components by the tube container 1 and subsequent swelling. Further, since the welded portion 12 is firmly joined, it is possible to suppress the leakage of the surfactant from the welded portion 12 to the outside.

[0129] Examples of the oil-soluble compound include tocopherols such as DL-α-tocopherol, D-δ-tocopherol, DL-α-tocopherol acetate, DL-α-tocopherol succinate, DL-α-tocopherol nicotinate, and DL-α-tocopherol linoleate; and 3-methyl-4-isopropylphenol (also known as isopropylmethylphenol). The oil-soluble compound is contained in the above-described content, for example, when the above-described content is a pharmaceutical, food, or cosmetic. The above-described tocopherols are so-called vitamin E and its derivatives, and are formulated in the above-described content in anticipation of anti-aging effects, peripheral vasodilating effects, blood circulation promoting effects, and the like. 3-Methyl-4-isopropylphenol is formulated as a bactericide and preservative in cosmetics such as acne cosmetics and pharmaceuticals.

[0130] Examples of the oily component include natural oils and fats such as triacylglycerol; diacylglycerol; rapeseed oil, rape oil, sesame oil, sunflower oil, corn oil, rice oil, grape oil, camellia oil, macadamia nut oil, olive oil, castor oil, safflower oil, soybean oil, tea seed oil, cocoa butter, coconut oil, hydrogenated coconut oil, palm oil, beeswax, hydrogenated castor oil, beeswax, candelilla wax, carnauba wax, lanolin, liquid lanolin, jojoba wax, hard lanolin, polyoxyethylene lanolin alcohol ether, polyoxyethylene cholesterol ether; hydrocarbon-based oils and fats such as liquid paraffin, ozokerite, squalene, paraffin, ceresin, petrolatum, microcrystalline wax; synthetic oily components such as isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, pentaerythritol tetra-2-ethylhexanoate, glycerol tri-2-ethylhexanoate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, methyl ester of castor oil fatty acid; and silicones such as chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, cyclic polysiloxanes such as decamethylpolysiloxane, dodecamethylpolysiloxane, tetramethyltetrahydrogenpolysiloxane, silicone resins capable of forming a three-dimensional network structure, silicone rubbers. These oily components are contained in the above-mentioned contents, for example, when the contents are foods such as mayonnaise or cosmetics.

[0131] Examples of volatile oily components include relatively low molecular weight silicone oils, relatively low molecular weight hydrocarbon oils, ether oils, etc. Examples of silicone oils include linear silicones or cyclic silicones. Specifically, examples of silicone oils include linear dimethylpolysiloxane and cyclic dimethylpolysiloxane. The linear dimethylpolysiloxane may be either linear or branched. Examples of linear ones include dimethylpolysiloxane (1.5 cs) and dimethylpolysiloxane (2 cs). Examples of branched ones include methyltrimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane. Examples of cyclic dimethylpolysiloxane include octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. Examples of hydrocarbons include isododecane, isotridecane, isohexadecane, light isoparaffin, and light liquid isoparaffin. Examples of ether oils include ethyl perfluorobutyl ether. These volatile oily components are mainly contained in the above-mentioned contents when the contents are cosmetics such as sunscreen water-in-oil emulsified cosmetics.

[0132] Examples of fragrances include peppermint oil, spearmint oil, anise oil, eucalyptus oil, wintergreen oil, cassia oil, clove oil, thyme oil, sage oil, lemon oil, orange oil, mint oil, cardamom oil, coriander oil, mandarin oil, lime oil, lavender oil, rosemary oil, laurel oil, chamomile oil, caraway oil, marjoram oil, bay oil, lemongrass oil, origanum oil, pine needle oil, neroli oil, rose oil, jasmine oil, grapefruit oil, sweetie oil, yuzu oil, cinnamon oil, shiso oil, wintergreen oil, clove oil, and pi Natural fragrances such as menthol oil, tea tree oil, tabana oil, star anise oil, fennel oil, diatomaceous oil, basil oil, iris concrete, absolute peppermint, absolute rose, orange flower, nutmeg, etc., or fragrances that have been processed (front distillation, back distillation, fractional distillation, liquid-liquid extraction, essences, powdered fragrances, etc.) from these natural fragrances; camphor, menthol, carvone, benzyl succinate, anethole, cineole, methyl salicylate, cinnamic aldehyde, eugenol, methyl eugenol, 3-l-menthoxy Propane-1,2-diol, thymol, linalool, linalyl acetate, limonene, menthone, menthyl acetate, N-substituted-paramenthan-3-carboxamide, pinene, octyl aldehyde, citral, pulegone, carbyl acetate, anisaldehyde, ethyl acetate, ethyl butyrate, allyl cyclohexane propionate, methyl anthranilate, ethyl methylphenylglycidate, vanillin, undecalactone, hexanal, butanol, isoamyl alcohol, hexenol, dimethyl sulf Examples of flavorings include single flavors such as amide, cyclotene, furfural, trimethylpyrazine, ethyl lactate, ethyl thioacetate, ocimene, n-decyl alcohol, methyl acetate, citronenyl acetate, ethyl linalool, vanillin, and benzaldehyde; and compound flavors such as strawberry flavor, apple flavor, banana flavor, pineapple flavor, grape flavor, mango flavor, butter flavor, milk flavor, fruit mix flavor, and tropical fruit flavor.The flavoring is contained in the content when the content is an oral composition, for example. The flavoring may be a food flavoring component such as wasabi, mustard, or the like.

[0133] Examples of sweeteners include saccharin, saccharin sodium, acesulfame potassium, stevia extract, stevioside, neohesperidyl dihydrochalcone, glycyrrhizin, perillartine, thaumatin, aspartyl phenylalanine methyl ester, methoxycinnamic aldehyde, palatinose, palatinit, erythritol, maltitol, xylitol, lactitol, etc. These sweeteners are contained in the contents when the contents are compositions for oral cavity, for example.

[0134] The surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants.The anionic surfactants include fatty acid soaps, higher alkyl sulfates, alkyl ether sulfates, N-acylsarcosinic acid, higher fatty acid amide sulfonates, phosphates, sulfosuccinates, alkylbenzene sulfonates, higher fatty acid ester sulfates, N-acylglutamate, sulfated oils, POE-alkyl ether carboxylic acids, POE-alkyl allyl ether carboxylates, α-olefin sulfonates, higher fatty acid ester sulfonates, secondary alcohol sulfates, higher fatty acid alkylolamide sulfates, sodium lauroyl monoethanolamide succinate, N-palmitoyl aspartic acid ditriethanolamine, and sodium caseinate. Examples of cationic surfactants include alkyl trimethyl ammonium salts, alkyl pyridinium salts, distearyl dimethyl ammonium chloride, dialkyl dimethyl ammonium salts, poly(N,N'-dimethyl-3,5-methylene piperidinium) chloride, alkyl quaternary ammonium salts, alkyl dimethyl benzyl ammonium salts, alkyl isoquinolinium salts, dialkyl morphonium salts, POE-alkyl amines, alkyl amine salts, polyamine fatty acid derivatives, amyl alcohol fatty acid derivatives, benzalkonium chloride, and benzethonium chloride. Examples of amphoteric surfactants include imidazoline-based amphoteric surfactants and betaine-based surfactants. Examples of nonionic surfactants include polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, sucrose fatty acid esters, alkyl glycosides, polyoxyethylene-polyoxypropylene block copolymers, polyoxyethylene ethers of glycerin esters, fatty acid alkylol amides, and glycerin fatty acid esters.

[0135] <Manufacturing method of tube containers> Next, a method for manufacturing the tube container 1 according to the first embodiment of the present invention will be described. Fig. 15 is a flow diagram showing a method for manufacturing the tube container according to the first embodiment of the present invention. The method for manufacturing the tube container 1 according to this embodiment includes a sheet preparation step S1, a stacking step S2, a cylindrical body forming step S3, a pouring portion joining step S4, a cap portion attachment step S5, and an end seal portion forming step S6.

[0136] In the sheet preparation step S1, a sheet S is prepared by laminating a plurality of layers together. For example, a first base layer SL1 made of a monolayer film and a reinforcing layer RL on which a barrier layer BL is vapor-deposited may be joined by an adhesive layer AL by dry lamination, and the reinforcing layer RL and a second base layer SL2 made of a monolayer film may be joined by an adhesive layer AL by dry lamination to prepare the sheet S. A commercially available laminated film including the first base layer SL1, the reinforcing layer RL, and the second base layer SL2 may be prepared. When the sheet S includes a plurality of reinforcing layers RL, these reinforcing layers may be joined by an adhesive layer AL by dry lamination.

[0137] Fig. 16 is a schematic diagram showing the sheet in the overlapping step and the cylindrical body forming step. In Fig. 16, the sheet S is shown from a direction corresponding to the cross-sectional view direction of Fig. 6. As shown in Fig. 16, in the overlapping step S2, the prepared sheet S is formed into a cylindrical shape, and the first side end portion SE1 and the second side end portion SE2 are overlapped with each other.

[0138] In the cylindrical body forming process S3, the first side end portion SE1 and the second side end portion SE2 are sandwiched between an ultrasonic horn 5 positioned on one of the radial inside and outside of the cylindrically formed sheet S and an anvil 6 positioned on the other of the radial inside and outside, and ultrasonically welded together to form a cylindrical body. In the cylindrical body forming process S3, a welded portion 12 is formed (see Figs. 4 and 6). In the present specification and drawings, the same or corresponding parts of the cylindrical body as those of the cylindrical body portion 10 are denoted by the same reference numerals.

[0139] At this time, as shown in FIG. 16, the first side end portion SE1 and the second side end portion SE2 are vibrated by ultrasonic waves from the ultrasonic horn 5 while being pressed in the thickness direction of the sheet S by the ultrasonic horn 5 and the anvil 6. In the present embodiment, the ultrasonic horn 5 is located on the outer side in the radial direction of the sheet S, and the anvil 6 is located on the inner side in the radial direction of the sheet S. Note that the ultrasonic horn 5 may be located on the inner side in the radial direction of the sheet S, and the anvil 6 may be located on the outer side in the radial direction of the sheet S.

[0140] At least one of the ultrasonic horn 5 and the anvil 6 has an uneven shape 51 for pressing against the sheet S when sandwiching the sheet S. In the present embodiment, only the ultrasonic horn 5 has the uneven shape 51. Note that both the ultrasonic horn 5 and the anvil 6 may have the uneven shape, or only the anvil 6 may have the uneven shape.

[0141] In the present embodiment, the ultrasonic horn 5 having the uneven shape 51 is located on the outer side in the radial direction of the sheet S formed in a cylindrical shape, and the anvil 6 is located on the inner side in the radial direction of the sheet S formed in a cylindrical shape. For this reason, unevenness is formed on the outer peripheral surface 123 of the welded portion along the uneven shape 51 of the ultrasonic horn 5 (see FIG. 11). Note that the ultrasonic horn 5 having the uneven shape 51 may be located on the inner side in the radial direction of the sheet S, and the anvil 6 may be located on the outer side in the radial direction of the sheet S.

[0142] In the present embodiment, due to the convex portions 511 of the uneven shape 51, the second side end portion SE2 is locally pushed into the first side end portion SE1 at a plurality of locations. As a result, in the welded portion 12, the resin components of the first side end portion SE1 and the second side end portion SE2 are more likely to melt and bond to each other (see FIGS. 6 and 11). Consequently, the first side end portion SE1 and the second side end portion SE2 are firmly welded to each other. More specifically, an integral layer ML is easily formed in the welded portion 12.

[0143] As shown in Fig. 16, the uneven shape 51 is positioned so as to overlap the entire first side end portion SE1 and the entire second side end portion SE2 when viewed from the radial direction of the sheet S formed in a cylindrical shape. Thereby, in the present embodiment, unevenness is formed over the entire circumferential direction DC at the welded portion 12.

[0144] Also, when viewed from the radial direction of the sheet S formed in a cylindrical shape, the width dimension of the uneven shape 51 in the circumferential direction of the sheet S formed in a cylindrical shape is preferably larger than the width dimension of the region where the first side end portion SE1 and the second side end portion SE2 overlap each other in the sheet S. Thereby, even when the length of the width dimension of the region where the first side end portion SE1 and the second side end portion SE2 overlap each other changes from the design dimension or when misalignment occurs between the ultrasonic horn 5 and the anvil 6, the first side end portion SE1 and the second side end portion SE2 can be more reliably welded to each other.

[0145] Fig. 17 is a plan view of the ultrasonic horn used in the method for manufacturing a tube container according to Embodiment 1 of the present invention, as viewed from the direction facing the anvil. Fig. 18 is a cross-sectional view of the ultrasonic horn of Fig. 17 as viewed in the direction of the arrow XVIII-XVIII.

[0146] As shown in Figs. 17 and 18, the height dimension DH of the convex portion 511 of the uneven shape 51 is preferably larger than the thickness dimension of the sheet S. The height dimension DH is more preferably 1.1 times or more, even more preferably 1.2 times or more, and most preferably 1.5 times or more the thickness dimension of the sheet S.

[0147] By locally pressing the overlapping portion of the first side end SE1 and the second side end SE2 at the convex portion 511, frictional heat due to ultrasonic waves is likely to be applied to the overlapping surface with the first side end SE1 and the second side end SE2. And if the height dimension DH is larger than the thickness dimension of the sheet S, the resin component of the melted sheet S flows into the space between the convex portions 511, and high stress can be applied to the portion of the sheet S that contacts the convex portion 511. Therefore, the first side end SE1 and the second side end SE2 can be firmly welded to each other. Also, in this embodiment, the integrated layer ML can be easily formed.

[0148] Also, it is preferable that the height dimension DH is 3 times or less the thickness dimension of the sheet S. If the height dimension DH is 3 times or less, penetration of the convex portion 511 through the sheet S can be suppressed. The height dimension DH is, for example, about 300 μm.

[0149] The shape of each of the plurality of convex portions 511 is not particularly limited, but for example, it is preferably substantially quadrangular pyramid-shaped. Also, the plurality of convex portions 511 are positioned so as to be arranged along each of one direction and the direction orthogonal thereto when viewed from the facing direction of the ultrasonic horn 5 and the anvil 6. Thereby, the convex portions 125 of the welded portion 12 are formed in a lattice shape.

[0150] The dimension DW of the distance between the vertices of the plurality of convex portions 511 is preferably 0.4 mm or more and 2.0 mm or less. If the dimension DW of the separation distance is 0.4 mm or more, the resin component of the sheet S flows in more easily. If the dimension DW of the separation distance is 2.0 mm or less, leakage of the resin component of the sheet S that has flowed into the space between the convex portions 511 from the uneven shape 51 can be suppressed. Note that the uneven shape 51 does not have to be formed so as to overlap the entire first side end SE1 and the second side end SE2, but it is preferably formed so as to overlap the entire thereof.

[0151] Note that the concavo-convex shape 51 is not limited to the above-described shape. FIG. 19 is a plan view showing a horn in which the convex portions of the concavo-convex shape are connected to each other in Embodiment 1 of the present invention. As shown in FIG. 19, when viewed from the above-described facing direction, the plurality of convex portions 511 may be connected to the convex portion 511 located closest thereto. That is, the convex portions 511 may be formed in a lattice shape that spreads over the entire concavo-convex shape 51. In this case, it is preferable that the intersections 511C of the lattice formed by the convex portions 511 in the concavo-convex shape 51 are arranged at intervals of 0.4 mm or more and 2.0 mm or less. Thereby, the resin component of the sheet S easily flows into the concave portion of the concavo-convex shape 51.

[0152] In the spout joining step S4, the spout 20 is joined to the cylindrical body CB. In the present embodiment, the spout 20 is joined to the cylindrical body CB by so-called insert molding. As shown in FIG. 15, the spout joining step S4 includes a cylindrical body end portion arranging step S41 and an injection molding step S42.

[0153] FIG. 20 is a schematic cross-sectional view showing a state in which an end portion of a cylindrical body is arranged inside a mold in the spout joining step. First, the mold 7 shown in FIG. 20 will be described. The mold 7 includes a core 71 and a cavity 72. The core 71 mainly has an outer shape corresponding to the inner surface of the spout 20. The core 71 has a first columnar portion 711, a mountain portion 712, and a second columnar portion 713.

[0154] The first columnar portion 711 has an outer shape corresponding to a part of the inner surface of the spout 21. The first columnar portion 711 extends in the vertical direction. The mountain portion 712 has an outer shape corresponding to the inner surface 222 of the shoulder portion 22. The top of the mountain portion 712 is connected to the lower portion of the first columnar portion 711. The mountain portion 712 expands in the horizontal direction as it goes downward. The second columnar portion 713 has an outer shape corresponding to the inner surface of the extending portion 23 and the tip 232. The second columnar portion 713 is connected to the lower portion of the mountain portion 712. A core step portion 713S corresponding to the step portion 233 of the extending portion 23 is formed in the second columnar portion 713.

[0155] The cavity 72 has a central portion 721, a first opposing portion 722, and a second opposing portion 723. The central portion 721 is arranged to be in contact with the upper surface of the first columnar portion 711. The central portion 721 has an outer shape corresponding to another part of the inner surface of the pouring outlet 21. In the present embodiment, a gate 721G is provided in the central portion 721 for injecting the molten resin composition into the mold 7.

[0156] The first opposing portion 722 is arranged to oppose the central portion 721, the first columnar portion 711, and the mountain portion 712 in the horizontal direction. The first opposing portion 722 has an outer shape corresponding to the outer peripheral surface of the pouring outlet 21, the outer surface 223 of the shoulder portion 22, and the outer surface of the thick portion 24. A gate for injecting the resin composition into the mold 7 may be provided in the first opposing portion 722.

[0157] The second opposing portion 723 is arranged to oppose the second columnar portion 713 in the horizontal direction. The second opposing portion 723 extends downward from the lower end of the first opposing portion 722.

[0158] As shown in FIG. 20, in the cylindrical body end portion arranging step S41, one end portion 13 in the axial direction of the cylindrical body CB is arranged inside the mold 7 so as to face upward. Specifically, the cylindrical body CB is arranged so as to be inserted into the mold 7 through the gap between the second columnar portion 713 and the second opposing portion 723. The cylindrical body CB is arranged such that one end portion 13 of the cylindrical body CB contacts the second opposing portion 723. At this time, the cylindrical body CB is arranged so as to intersect a virtual surface VSx corresponding to the virtual extension surface VS described above. The virtual surface VSx is a virtual surface formed by extending the outer surface of the mountain portion 712 to the outer peripheral side.

[0159] The cylindrical body CB is further arranged so as to be pressed against the first opposing portion 722 from below. As a result, one end portion 13 of the cylindrical body CB bends toward the radial center. One end portion 13 of the cylindrical body CB curves toward the inside in the radial direction. One end portion 13 of the cylindrical body CB is arranged so as to be in contact with the first opposing portion 722. Here, since the sheet S constituting the cylindrical body CB includes the reinforcing layer RL, it is more effectively suppressed that one end portion 13 of the cylindrical body CB bends excessively toward the radial center. One end portion 13 of the cylindrical body CB is easily arranged so as to be in contact with the first opposing portion 722.

[0160] In the injection molding step S42, inside the mold 7, the molten resin composition is filled from above the cylindrical body CB. In the present embodiment, the resin composition is filled from the gate 721G. The resin composition portion flows on the core 71 in the order of the first columnar portion 711, the mountain portion 712, and the second columnar portion 713.

[0161] FIG. 21 is a partial cross-sectional view showing an enlarged view of the region XXI in FIG. 20. In FIG. 21, the flow of the molten resin composition is indicated by thick arrows. As shown in FIGS. 20 and 21, the molten resin composition flows into the inner peripheral surface of one end portion 13 of the cylindrical body CB from above the cylindrical body CB. As a result, the resin composition is more likely to take a flow path along the virtual extension surface VS, and more surely hits the inner peripheral surface 131 of one end portion 13 of the cylindrical body CB corresponding to the cylindrical body portion 10. As a result, it is further suppressed that the resin composition wraps around to the outer peripheral side of the cylindrical body portion 10, and the yield of insert molding is further improved.

[0162] More specifically, one end portion 13 of the cylindrical body CB is arranged to intersect the virtual plane VSx. For this reason, when the resin composition flows in from above the mountain portion 712 between the second columnar portion 713 and the second opposing portion 723, the resin composition hits the inner peripheral surface 131 of one end portion 13 of the cylindrical body CB. The cylindrical body CB is pushed radially outward by the resin composition. Therefore, it is possible to suppress the resin composition from surrounding the outer peripheral side of the cylindrical body CB. Further, one end portion 13 of the cylindrical body CB is arranged to be pressed against the first opposing portion 722 from below. Thereby, it is further possible to suppress the resin composition from surrounding the outer peripheral side of the cylindrical body CB.

[0163] In addition, in the present embodiment, the welded portion 12 of the cylindrical body CB (cylindrical body portion 10) and its peripheral portion are likely to be convexly curved toward the inner peripheral side. However, as described above, it is possible to suppress the resin composition from surrounding the outer peripheral side of the cylindrical body CB. For this reason, it is also possible to suppress the resin composition from surrounding the outer peripheral side of the welded portion 12.

[0164] Also, the resin composition that has flowed into the space between the second columnar portion 713 and the second opposing portion 723 flows downward so as to fall. In this space, the resin composition collides with the core step portion 713S, and an excessive increase in the flow velocity is suppressed. Thereby, when the resin composition reaches the contact portion between the second columnar portion 713 and the cylindrical body CB (that is, the lower end of the internal space of the mold 7), it is possible to suppress a large stress from being applied to the cylindrical body CB from the inner peripheral side. By suppressing the above stress, it is possible to suppress one end portion 13 of the cylindrical body CB from bending toward the inner peripheral side. Further, since the core step portion 713S is inclined with respect to the axial direction DA, it is possible to suppress an increase in the injection pressure. As a result, it is possible to suppress the resin composition from entering the contact portion between the second columnar portion 713 and the cylindrical body CB, and to suppress the generation of burrs.

[0165] Finally, a resin composition is filled between the core 71 and the cavity 72, and between the core 71 and the cylindrical body CB. In this way, the pouring portion 20 is injection-molded so as to be joined to the inner peripheral surface of one end portion 13 of the cylindrical body CB. In the present embodiment, the gate mark formed by the solidification of the resin composition in the gate 721G is cut off after the injection molding of the pouring portion 20. However, a part of the gate mark may not be cut off.

[0166] Here, a method for manufacturing a tube container according to a comparative example and the tube container manufactured by the method will be described. FIG. 22 is a schematic cross-sectional view showing an injection molding process of a tube container according to a comparative example. As shown in FIG. 22, in the method for manufacturing a tube container according to the comparative example, one end portion 913 of the cylindrical body 9CB does not intersect the virtual plane 9VS. Therefore, when the resin composition flows from above the mountain portion 9712 between the second columnar portion 9713 and the second opposing portion 9723, the resin composition easily contacts the edge of one end portion 913 of the cylindrical body 9CB. As a result, the resin composition easily enters the outer peripheral side of the cylindrical body 9CB.

[0167] FIG. 23 is a cross-sectional view partially showing a tube container according to a comparative example. As a result of the resin composition entering the outer peripheral side of the cylindrical body 9CB as described above, as shown in FIG. 23, the cylindrical body portion 910 is not properly joined to the outer peripheral side of the extending portion 923 of the pouring portion 920 and enters the inside of the extending portion 923.

[0168] The cap portion attaching step S5 and the end seal portion forming step S6 of the manufacturing method according to the embodiment of the present invention will be described. As shown in FIG. 15, in the cap portion attaching step S5, a preformed cap portion 40 is attached to the pouring portion 20. As the molding method of the cap portion 40, a conventionally known method such as injection molding or compression molding can be adopted. When the tube container 1 does not include the cap portion 40, the manufacturing method of the tube container may not include the cap portion attaching step S5.

[0169] The end seal portion forming step S6 includes a step S61 of melting the inner peripheral surface and a pressing step S62.

[0170] In step S61 of the end seal portion forming step S6, the sheet S formed in a tubular shape, that is, the inner peripheral surface of the tubular body CB (see FIG. 14) is heated with hot air (warm air). More specifically, the inner peripheral surface of the end of the tubular body CB on the side opposite to the pouring portion 20 side is heated with hot air. As a result, at least a part of the inner peripheral surface of the tubular body CB is melted, and the inner peripheral surfaces become in a state where they can be welded to each other.

[0171] In the pressing step S62, the portion of the tubular body CB (see FIG. 14) heated in step S61 is sandwiched from both sides in the first direction D1. As a result, at least a part of the portions of the inner peripheral surface of the sheet S (tubular body) that have become weldable are welded to each other.

[0172] As described above, the tube container 1 according to the present embodiment is manufactured. Note that the manufacturing method of the tube container 1 according to the present embodiment includes the cap portion attaching step S5 and the end seal portion forming step S6 in this order, but this order may be reversed. Further, when manufacturing a tube container containing contents, for example, after the pouring portion joining step S4 or the cap portion attaching step S5 and before the end seal portion forming step S6, the contents may be filled into the tubular body CB from the other end portion 14 side. Further, when manufacturing a tube container containing contents, after the end seal portion forming step S6, the contents may be filled into the tubular body CB from the pouring portion 20.

[0173] Since the sheet S constituting the tubular body portion 10 of the tube container 1 according to the above-described Embodiment 1 may contain a polyester-based resin as a main component, it has excellent recyclability. Further, in the above-described tube container 1, since the tubular body portion 10, the dispensing portion 20, and the end seal portion 30 as a whole contain a polyester-based resin as a main component, the recyclability of the tube container 1 can be further improved. Also, since the tube container 1 as a whole contains a polyester-based resin as a main component, the recyclability of the tube container 1 can be further improved. Therefore, the tube container 1 according to Embodiment 1 of the present invention conforms to the sustainable circular economy required by the SDGs (Sustainable Development Goals) and can greatly contribute to the reduction of plastic waste. In this specification, when a certain member contains a polyester-based resin as a main component, it may mean that the content of the polyester-based resin in the certain member is 85% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more.

[0174] (Embodiment 2) Hereinafter, the tube container according to Embodiment 2 of the present invention will be described. The position of one end portion of the tubular body portion of the tube container according to Embodiment 2 of the present invention is different from that of the tube container 1 according to Embodiment 1 of the present invention. For this reason, in the following description, the description of the same configurations and effects as those of the tube container 1 according to Embodiment 1 may not be repeated.

[0175] FIG. 24 is a partial cross-sectional view showing the tube container according to Embodiment 2 of the present invention. The cross-sectional view of the tube container 1A according to Embodiment 2 shown in FIG. 24 corresponds to FIG. 13 in Embodiment 1. In the tube container 1A according to Embodiment 2, one end portion 13A extends along a part of the curved portion of the outer surface 221S of the outer peripheral end 221 of the shoulder portion 22.

[0176] Also in the present embodiment, one end portion 13 of the cylindrical body portion 10 intersects with a virtual extension surface VS formed by extending the inner surface 222 of the shoulder portion 22 toward the radially outer side. Thereby, also in the present embodiment, when the injection portion 20 is insert-molded, the resin composition is suppressed from overflowing to the outer peripheral side of the cylindrical body portion 10 (cylindrical body). As a result, the yield when insert-molding the injection portion 20 so as to join to the inner peripheral surface 131 of one end portion 13A of the cylindrical body portion 10 is improved.

[0177] In the present embodiment, the contact portion 29A is formed on the curved outer surface 221S of the outer peripheral end 221.

[0178] (Embodiment 3) Hereinafter, a tube container according to Embodiment 3 of the present invention will be described. The tube container according to Embodiment 3 of the present invention is different from the tube container 1 according to Embodiment 1 of the present invention in the position of one end portion of the cylindrical body portion and the shape of the injection portion. Therefore, in the following description, the description of the same configuration and effects as those of the tube container 1 according to Embodiment 3 may not be repeated.

[0179] FIG. 25 is a partial cross-sectional view showing a tube container according to Embodiment 3 of the present invention. FIG. 26 is a partial cross-sectional view showing an enlarged view of region XXVI in FIG. 25. The cross-sectional view of the tube container 1B according to Embodiment 3 shown in FIG. 25 corresponds to FIG. 12 in Embodiment 1.

[0180] As shown in FIGS. 25 and 26, in the tube container 1B according to Embodiment 3, one end portion 13B does not extend along the curved portion of the outer surface 221S of the outer peripheral end 221 of the shoulder portion 22. That is, one end portion 13B of the cylindrical body portion 10 extends substantially parallel to the axial direction DA.

[0181] Also in this embodiment, one end portion 13B of the cylindrical body portion 10 intersects a virtual extension surface VS formed by extending the inner surface 222 of the shoulder portion 22 radially outward. Thereby, also in this embodiment, when insert molding the pouring portion 20B, it is possible to suppress the resin composition from overflowing to the outer peripheral side of the cylindrical body portion 10 (cylindrical body). As a result, the yield when insert molding the pouring portion 20B so as to be joined to the inner peripheral surface 131 of one end portion 13B of the cylindrical body portion 10 is improved.

[0182] Further, in this embodiment, the radial thickness of the base portion 231B of the extending portion 23 is thicker than the thickness of the shoulder portion 22. Thereby, when the resin composition takes a flow path that flows into the extending portion 23 in order from the shoulder portion 22 during insert molding of the pouring portion 20B, the width of the flow path in the extending portion 23 becomes wider than that of the shoulder portion 22. Therefore, it is possible to suppress the resin composition from overflowing to the outer peripheral side of the cylindrical body portion 10 (cylindrical body).

[0183] In addition, in this embodiment, the pouring portion 20B further includes a gate mark 25. The gate mark 25 is located on the inner peripheral surface of the pouring port 21. Further, the contact portion 29B is formed on the extending portion 23. A portion of the outer surface of the extending portion 23 that is not covered by the cylindrical body portion 10 may be substantially flush with the outer peripheral surface 132 of one end portion 13 of the cylindrical body portion 10.

[0184] (Supplementary Note) As described above, the embodiments of the present invention include the following disclosures.

[0185] <Configuration 1> A cylindrical body portion having a belt-shaped welded portion formed by bending or curving a single sheet and welding the first side end portion in the plane direction of the sheet and the second side end portion of the sheet located opposite to the first side end portion so as to overlap each other in the thickness direction of the sheet, A pouring portion joined to one end portion in the axial direction of the cylindrical body portion and capable of pouring out the contents accommodated in the cylindrical body portion. The pouring-out part includes a pouring outlet for pouring out the content, a shoulder part that expands radially from the pouring outlet around the pouring outlet when viewed in the axial direction, and an extension part that extends along the axial direction from the outer peripheral end of the shoulder part in the opposite direction to the pouring outlet side and joins with the inner peripheral surface of the one end part of the cylindrical body part on the outer side in the radial direction. The sheet includes a base material layer containing a polyester-based resin. The pouring-out part is made of a resin composition containing a polyester-based resin. The pouring-out part is an insert molding member joined to the one end part of the cylindrical body part by injection molding of the resin composition. The one end part of the cylindrical body part intersects with a virtual extension surface formed by extending the inner surface of the shoulder part radially outward, a tube container.

[0186] <Configuration 2> The extension part includes a root part which is a part joined to a position intersecting with the virtual extension surface at the one end part of the cylindrical body part. From the root part to the tip of the extension part in the axial direction, the thickness of the extension part in the radial direction is the thickest at the root part, the tube container according to <Configuration 1>.

[0187] <Configuration 3> The extension part is located between the shoulder part and the tip of the extension part in the axial direction, and includes a stepped part where the inner surface of the extension part bends radially outward as it moves away from the shoulder part, the tube container according to <Configuration 1> or <Configuration 2>.

[0188] <Configuration 4> Among the outer surfaces of the shoulder part, the outer surface of the outer peripheral end is curved. The one end part of the cylindrical body part extends along a curve along the outer surface of the outer peripheral end, the tube container according to any one of <Configuration 1> to <Configuration 3>.

[0189] <Configuration 5> A method for manufacturing a tube container according to any one of <Configuration 1> to <Configuration 4>, a step of preparing the sheet, a step of forming the prepared sheet into a cylindrical shape while overlapping the first side end portion and the second side end portion with each other, a step of forming a cylindrical body corresponding to the cylindrical body portion by sandwiching and ultrasonically welding the first side end portion and the second side end portion with an ultrasonic horn positioned on one side of the radially inner side and the radially outer side of the sheet formed into a cylindrical shape and an anvil positioned on the other side of the radially inner side and the radially outer side, and a step of joining the pouring portion to the cylindrical body, the step of joining the pouring portion includes a step of disposing the one end portion of the cylindrical body inside a mold so that one end portion in the axial direction of the cylindrical body faces upward, a step of filling the resin composition so that the molten resin composition flows into the inner peripheral surface of the end portion of the cylindrical body from above the cylindrical body inside the mold, and injection molding the pouring portion so as to join it to the inner peripheral surface of the end portion of the cylindrical body. A method for manufacturing a tube container.

[0190] It should be considered that all the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the scope of claims, and it is intended that all modifications within the meaning and scope equivalent to the scope of claims are included.

Explanation of Signs

[0191] 1, 1A, 1B tube container, 10 cylindrical body, 11 sheet base, 111 first base end, 112 second base end, 113 extending portion, 12 welding portion, 121 first tip edge, 122 second tip edge, 123 outer peripheral surface of the welding portion, 124 inner peripheral surface of the welding portion, 13, 13A, 13B one end, 131 inner peripheral surface, 132 outer peripheral surface, 133 end face, 14 the other end, 15 body portion, 20, 20B pouring portion, 21 pouring outlet, 211 male screw portion, 221 outer peripheral end, 22 shoulder portion, 23 extending portion, 231, 231B root portion, 232 tip, 233 stepped portion, 24 thick portion, 25 gate mark, 29, 29A, 29B abutting portion, 30 end seal portion, 40 cap portion, 5 ultrasonic horn, 51 concavo-convex shape, 511C intersection point, 6 anvil, 7 mold, 71 core, 711 first columnar portion, 712 crest portion, 713 second columnar portion, 713S core stepped portion, 72 cavity, 721 central portion, 721G gate, 722 first opposing portion, 723 second opposing portion, AL adhesive layer, BL barrier layer, CB cylindrical body, ML integral layer, RL reinforcing layer, RL1 first reinforcing layer, RL2 second reinforcing layer, RL3 third reinforcing layer, S, Sa, Sb sheet, SB1 first interlayer portion, SB2 second interlayer portion, SE1 first side end portion, SE2 second side end portion, SL1 first base material layer, SL2 second base material layer.

Claims

1. A tubular body portion having a strip-shaped welded portion formed by bending or curving a single sheet and welding a first side end portion in the plane direction of the sheet and a second side end portion of the sheet located opposite to the first side end portion so as to overlap each other in the thickness direction of the sheet; A spout portion joined to one end portion of the tubular body portion in the axial direction and capable of pouring out the contents accommodated in the tubular body portion; The spout portion includes a spout for pouring out the contents, a shoulder portion that extends radially from the spout around the spout when viewed in the axial direction, and an extension portion that extends from the outer peripheral end of the shoulder portion along the axial direction opposite to the spout side and joins the inner peripheral surface of the one end portion of the tubular body portion on the outer side in the radial direction; The sheet includes a base material layer containing a polyester-based resin; The spout portion is made of a resin composition containing a polyester-based resin; The spout portion is an insert molding member joined to the one end portion of the tubular body portion by injection molding the resin composition; The one end portion of the tubular body portion intersects a virtual extension surface formed by extending the inner surface of the shoulder portion radially outward, a tube container.

2. The extension portion includes a root portion that is a portion joined to a location where the extension portion intersects the virtual extension surface at the one end portion of the tubular body portion; The tube container according to claim 1, wherein the thickness of the extension portion in the radial direction from the root portion to the tip of the extension portion in the axial direction is the thickest at the root portion.

3. The tube container according to claim 1, wherein the extension portion includes a stepped portion located between the shoulder portion and the tip of the extension portion in the axial direction, and the inner surface of the extension portion bends radially outward as it moves away from the shoulder portion.

4. Of the outer surface of the shoulder portion, the outer surface of the outer peripheral end is curved; The tube container according to claim 1, wherein the one end portion of the tubular body portion extends along the outer surface of the outer peripheral end so as to be curved.

5. A method for manufacturing the tube container according to any one of claims 1 to 4, comprising: A step of preparing the sheet; A step of forming the prepared sheet into a tubular shape while overlapping the first side end portion and the second side end portion with each other; An ultrasonic horn positioned on one side of the radially inner and outer sides of the cylindrically formed sheet, and an anvil positioned on the other side of the radially inner and outer sides, sandwich the first side end portion and the second side end portion and ultrasonically weld them to form a cylindrical body corresponding to the cylindrical body portion. A step of joining the pouring portion to the cylindrical body. The step of joining the pouring portion is as follows: A step of disposing the one end portion of the cylindrical body inside the mold so that the one end portion in the axial direction of the cylindrical body faces upward. A method for manufacturing a tube container, including a step of filling the resin composition so that the molten resin composition flows into the inner peripheral surface of the one end portion of the cylindrical body from above the cylindrical body inside the mold, and injecting and molding the pouring portion so as to join it to the inner peripheral surface of the one end portion of the cylindrical body.

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