container

Abstract

To maintain a quality of contents with the same configuration as much as possible before and after opening while giving a user a feeling of opening a package.SOLUTION: A container comprises a container body 1 and a lid 2. The lid includes stoppers 23 and 25 that are fitted to a mouth 12 of the container body so as to close an opening. The stopper includes a tubular metal layer 41 arranged concentrically with respect to the mouth. The mouth includes a mouth-facing layer 12a having a surface diametrically opposed to the stopper. The mouth-facing layer, which is made of resin having a lower melting point than a surface layer 42 including a surface of the stopper, has a welding mark 14 separably welded to the surface of the stopper when unopened, and indicating a welding state when unopened after opening. Welding is broken when opening, a feeling of opening is given to a user, and when the lid is closed after opening, the welding mark 14 and the surface layer 42 of the stopper face each other, so that a quality of contents can be maintained in substantially the same state before and after opening.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a container comprising a container body and a lid that is detachable from the container body. [Background technology]

[0002] An example of a conventional container is one in which a film-like sealing material such as an aluminum seal is attached to the mouth of the container body when the lid is opened (Patent Document 1). This sealing material closes (seals) the mouth of the container body, and maintains the quality of the contents when unopened. Incidentally, it is known that metal foils, such as aluminum seals, are less permeable to gas than resins. In addition, the sealing material is peeled off from the mouth of the container body when it is opened, and gives the user a peeling force, in other words, a feeling of opening. Note that the sealing material is usually discarded after opening. In addition, in order to maintain the quality of the contents after opening, this container adopts a configuration in which the outer peripheral surface of the mouth of the container body and the inner peripheral surface of the lid are in contact with each other when the lid is closed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-11127 A Summary of the Invention [Problem to be solved by the invention]

[0004] In other words, in the case of the container disclosed in Patent Document 1, the structure (sealing material) that maintains the quality of the contents when unopened is adopted as a structure that gives the user the feeling that the container has been opened when opened, but since the container is discarded after opening, it is not adopted as a structure that maintains the quality of the contents when the lid is closed after opening.

[0005] The present invention was created in consideration of the above-mentioned circumstances, and its purpose is to provide a container that gives the user the feeling of having been opened when opened, while maintaining the quality of the contents with a configuration that is as similar as possible when the container is unopened and when the lid is closed after opening, that is, before and after opening. [Means for solving the problem]

[0006] The container of the present invention comprises a container body and a lid that is detachable from the container body. The lid comprises a plug portion that fits into the mouth of the container body in a state where it closes the opening. The plug portion comprises a tubular metal layer that is concentrically arranged with the mouth. The mouth comprises a mouth-facing layer that includes a surface that faces the plug portion in the mouth diameter direction. The mouth-facing layer is made of a resin that has a lower melting point than a surface layer that includes the surface of the plug portion, and is detachably welded to the surface layer of the plug portion when unopened, and after opening, has weld marks that indicate the welded state when unopened, all around the circumference of the mouth.

[0007] As long as the metal layer has a cylindrical portion arranged concentrically about the mouth, it does not matter whether it has any other portions, but in order to prevent gas from entering or leaving the container body from the mouth as much as possible and to maintain the quality of the contents as much as possible, it is desirable to do the following. That is, the metal layer comprises a cylindrical metal layer tube portion that is arranged concentrically with the mouth portion, and a metal layer bottom portion that closes one side of the metal layer tube portion in the penetrating direction.

[0008] The mouth part may or may not have a weld mark over its entire length in the penetrating direction. However, even in the case where the mouth part has a weld mark over a part of its entire length in the penetrating direction and the remaining part, i.e., a part adjacent to the weld mark in the penetrating direction of the mouth part, has a weld mark adjacent surface, it is preferable to improve the degree of contact between the surface layer of the plug fitting part and the mouth part facing layer as much as possible in order to maintain the quality of the contents at least as much as possible when the container is unopened as follows. In other words, the welding mark is recessed in the direction of the diameter of the mouth portion relative to the surface adjacent to the welding mark.

[0009] The surface layer may or may not be the same layer as the metal layer, but in order to make the metal layer less likely to be damaged (to peel off or chip) and to prevent the contents from coming into contact with the metal, and thus to maintain the quality of the contents as much as possible, it is desirable to do the following: That is, the surface layer is made of resin and is integrated with one surface side of the metal layer in the diameter direction. In other words, if the surface layer is made of resin, it is a layer different from the metal layer.

[0010] There are no restrictions on the material that the lid is made from, but in order to make the metal layer less likely to be damaged (to peel off or chip) and to maintain the quality of the contents as much as possible, it is desirable to do the following: That is, the lid comprises a resin lid body and a sheet material welded to a part of the lid body. The sheet material comprises, in addition to a metal layer and a surface layer, a resin adhesive layer that is integral with the other surface side of the metal layer in the diameter direction, and the adhesive layer is made of a resin with a lower melting point than the surface layer and is welded to the lid body to be integrated.

[0011] Regarding the part, the lid may or may not be composed of only the plug portion, but in order to make it easier to separate the plug portion from the mouth portion when opening, it is preferable to do as follows. That is, the container body is provided with a male threaded portion for opening and closing, the lid is provided with a lid outer wall portion having a female threaded portion for opening and closing formed on its inner surface, and the lid outer wall portion and the stopper portion are integrated together.

[0012] There are two types of plugs: the first type is an inner plug that blocks the mouth from the inside, and the second type is an outer plug that blocks the mouth from the outside, and includes a plug plate that covers the end face and opening of the mouth, and a plug wall that extends from the outer periphery of the plug plate to cover the outside of the mouth in the diameter direction. Effect of the Invention

[0013] In the container of the present invention, the mouth-facing layer is detachably welded to the surface layer of the plug when unopened, so that when opened, the user feels a force separating the mouth-facing layer and the surface layer, i.e., a sensation of opening. Furthermore, in the container of the present invention, the structure (the mouth-facing layer and the surface layer of the plug) that maintains the quality of the contents when unopened continues to exist in substantially the same state even after opening, and when the lid is closed after opening, the welded trace of the mouth-facing layer and the surface layer of the plug face each other, so that the quality of the contents can be maintained in substantially the same state before and after opening.

[0014] Furthermore, in the container of the present invention, when the metal layer has a cylindrical metal layer tube portion arranged concentrically with the mouth portion and a metal layer bottom portion blocking one side of the metal layer tube portion in the penetrating direction, it is more difficult for gas to enter or exit the container body from the mouth portion when the lid is closed than when there is no metal layer bottom tube portion, thereby maintaining the quality of the contents.

[0015] Furthermore, in the container of the present invention, when the weld mark is recessed in the direction of the diameter of the mouth portion further than the surface adjacent to the weld mark, the degree of adhesion between the surface layer of the stopper portion and the layer facing the mouth portion is higher, at least when the container is unopened, than when the weld mark is not recessed, and the quality of the contents can be maintained.

[0016] Furthermore, in the container of the present invention, when the surface layer is made of resin and is integrated with one surface side of the metal layer in the diameter direction, the metal layer is less likely to be damaged and the quality of the contents can be maintained.

[0017] Furthermore, when the container of the present invention is configured to have a resin lid main body and sheet material, the adhesive layer of the sheet material is made of a resin having a lower melting point than the surface layer and is welded to the lid main body to form a single unit, making the metal layer less susceptible to damage and allowing the quality of the contents to be maintained.

[0018] Furthermore, when the container of the present invention is configured such that the container body has a male threaded portion and the outer wall portion of the lid has a female threaded portion, the opening operation is clear and the lid can be opened simply by twisting the lid, making it easy to separate the stopper portion from the mouth portion when opening. [Brief description of the drawings]

[0019] [Figure 1] 1A and 1B are cross-sectional views showing the container of the first embodiment of the present invention in an unopened state and after opening. [Diagram 2] 13A and 13B are cross-sectional views showing a container of a second embodiment of the present invention in an unopened state and after opening. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] As shown in Fig. 1, the container of the first embodiment of the present invention comprises a container body 1 for accommodating contents, and a lid 2 that can be attached and detached to the container body 1. The container body 1 is made of resin, more specifically, thermoplastic resin, for example, polyethylene. The lid 2 is an insert-molded product, and comprises a lid body 3 made of resin (more specifically, thermoplastic resin) that forms the outer shape of the lid 2, and a sheet material 4 welded to a part of the lid body 3. The lid body 3 is made of, for example, polyethylene terephthalate (PET). The container body 1 and the lid 2 will be described in detail below in that order.

[0021] The container body 1 includes a storage section 11 for storing the contents, and a mouth section 12 that is continuous with the storage section 11 and allows the contents to pass through. In this embodiment, the container body 1 is an extrusion tube that can crush the storage section 11 in the diameter direction. Therefore, the container body 1 is elastically deformable, and the contents are pushed out from the mouth section 12 by crushing the storage section 11. The container body 1 is formed, for example, by blow molding. A parting line PL is formed on the surface of the container body 1 in a state that it extends along the depth direction of the container body 1, and in this embodiment, it is formed over the entire length of the outer peripheral surface of the mouth section 12 in the penetration direction of the mouth section 12, and is formed in a state that it is continuous from the mouth section 12 to the outer peripheral surface of the storage section 11. The parting line PL is formed at a position symmetrical in the diameter direction with respect to the surface of the container body 1. The parting line PL protrudes on the surface of the container body 1 more than the part adjacent to the parting line PL in the circumferential direction.

[0022] The container 11 is cylindrical, with one end in the penetrating direction of the tube closed and the other end opening in an annular shape. The opening at the other end of the container 11 is continuous with the mouth 12. The mouth 12 is cylindrical.

[0023] In this embodiment, the lid 2 comprises a lid plate portion 21 that covers the end face and opening of the mouth portion 12, a lid outer wall portion 22 that extends from the outer periphery of the lid plate portion 21 in a state of covering the outside in the diameter direction of the mouth portion 12, and a plug portion 23 that protrudes from the lid plate portion 21 and fits into the mouth portion 12 while closing its opening. The lid plate portion 21 is a separate portion from the lid outer wall portion 22 and the plug portion 23, and the lid outer wall portion 22 and the plug portion 23 are indirectly integrated via this separate portion (the lid plate portion 21).

[0024] The cover plate portion 21 is disk-shaped and has a diameter larger than the outer diameter of the end face of the mouth portion 12. The cover outer wall portion 22 is cylindrical and continues around the entire outer periphery of the cover plate portion 21.

[0025] The lid outer wall 22 and the container body 1 are provided with a screw portion for opening and closing. The screw portion is composed of a female screw portion 22a formed on the inner peripheral surface of the lid outer wall 22 and a male screw portion 12a formed on the outer peripheral surface of the mouth portion 12 of the container body 1. In the depth direction of the lid 2, the female screw portion 22a is formed on the inner peripheral surface of the lid outer wall 22 opposite to the lid plate portion 21. In the penetration direction of the mouth portion 12, the male screw portion 12a is formed on the outer peripheral surface of the mouth portion 12 on the side of the container portion 11. In other words, the screw portion is formed on the opposite side to the opening side of the entire length of the mouth portion 12 in the penetration direction when the lid 2 is closed. And, when the lid 2 is closed, a gap G is formed between the outer peripheral surface of the mouth portion 12 and the inner peripheral surface of the lid outer wall 22, which is closer to the lid plate 21 than the screw portion. Also, the stopper portion 23 is fitted inside the mouth portion 12 on the opposite side of the gap G in the diameter direction.

[0026] In this embodiment, the plug portion 23 is a type that blocks the mouth portion 12 of the container body 1 from the inside, that is, an inner plug type. The plug portion 23 has a cylindrical protrusion with an outer circumferential surface, more specifically, a disk shape. The plug portion 23 has a cylindrical outer circumferential surface 23a and a circular bottom surface 23b. The height 23H of the cylindrical outer circumferential surface 23a is shorter than the diameter 23D of the circular bottom surface 23b, more specifically, shorter than the radius of the bottom surface 23b. The plug portion 23 is an integral member of a portion 3a (hereinafter referred to as the "inner plug body") that protrudes from the cover plate portion 21 of the resin lid body portion 3 and a sheet material 4 that covers the surface of the inner plug body portion 3a.

[0027] Since the inner plug main body 3a and the sheet material 4 are integrated, the surface of the inner plug main body 3a cannot be seen. However, the surface of the inner plug main body 3a exists as a concept. The surface of this inner plug main body 3a is formed by a cylindrical outer circumferential surface facing the mouth 12 in the aperture direction, and a circular bottom surface facing the inner side of the storage section 11. The sheet material 4 is arranged so as to continuously cover not only the entire surface of the inner plug main body 3a (the entire outer circumferential surface and bottom surface), but also the portion of the cover plate 21 that protrudes like a brim from the inner plug main body 3a (the portion of the cover plate 21 that surrounds the inner plug main body 3a).

[0028] The sheet material 4 is originally flat and has a laminated structure in which multiple layers are stacked on top of each other. The sheet material 4 includes a metal foil 41, which is a metal layer located at the center in the thickness direction, a resin protective layer 42 located on one side in the thickness direction (the lower side in the figure) and integral with one side of the metal foil 41, and a resin adhesive layer 43 located on the other side in the thickness direction (the upper side in the figure) and integral with the other side of the metal foil 41.

[0029] Both the protective layer 42 and the adhesive layer 43 are made of a thermoplastic resin, and the protective layer 42 has a higher melting point than the adhesive layer 43. The protective layer 42 and the adhesive layer 43 are transparent in color, and when the sheet material 4 is a single body, the metal foil 41 can be seen through the protective layer 42 and the adhesive layer 43. One example of the metal foil 41 is aluminum foil, and is, for example, silver in color.

[0030] Furthermore, before the lid 2 is insert-molded, the sheet material 4 is pressed into a shape corresponding to the surface of the inner plug main body 3a, more specifically, into a hat shape (a hat shape with a brim). The sheet material 4 is pressed so that the adhesive layer 43 faces the concave side of the hat shape. When the lid 2 is formed by insert molding, the adhesive layer 43 is welded to the inner plug main body 3a, and the protective layer 42 becomes the surface layer 42 including the surface of the plug portion 23. The sheet material 4 includes a sheet bottom portion 4a that covers the bottom surface of the inner plug main body 3a, a cylindrical sheet cylinder portion 4b that covers the outer peripheral surface of the inner plug main body 3a, and a sheet flange portion 4c that covers the entire circumference of the plug portion 23 of the lid plate portion 21 in a flange-like shape. In other words, the sheet material 4 has one end of the tubular sheet portion 4b in the tube penetration direction blocked by the sheet bottom portion 4a, and the sheet flange portion 4c protruding from the other end of the tubular sheet portion 4b in the tube penetration direction outward in the mouth direction in a flange-like shape. The tubular sheet portion 4b is cylindrical, and the sheet flange portion 4c is annular. When the lid 2 is closed, the tubular sheet portion 4b is concentrically disposed with the mouth portion 12.

[0031] Similarly to the sheet material 4, the metal foil (metal layer) 41 has a cylindrical metal layer tube portion 41a arranged concentrically with the mouth portion 12, a metal layer bottom portion 41b that closes one side of the metal layer tube portion 41a in the penetration direction, and a metal layer flange portion 41c that protrudes like a flange outward in the diameter direction from the other end side of the metal layer tube portion 41a in the penetration direction.

[0032] The lid 2 is formed by insert molding as described above. More specifically, the lid 2 is formed by placing the sheet material 4 inside a mold and then injecting molten resin into the mold. The resin injected into the mold constitutes the lid main body 3. Therefore, the lid 2 is a product in which the resin lid main body 3 and the sheet material 4 are integrated as described above.

[0033] The sheet material 4 and the mouth portion 12 are in a fitted relationship when the lid 2 is closed. When the lid 2 is closed, the surface layer 42 (protective layer 42) of the sheet tube portion 4b of the sheet material 4 and the mouth portion 12 face each other in the diameter direction, are detachably welded when the lid 2 is unopened, and are in contact after the lid 2 is opened. The layer of the mouth portion 12 including the surface (in the present embodiment, the inner peripheral surface) facing the plug portion 23 in the diameter direction is called the mouth portion facing layer 12c. It does not matter whether the mouth portion 12 is a single layer or a multi-layer in which multiple layers are stacked in the diameter direction of the mouth portion 12. The mouth portion facing layer 12c is detachably welded to the surface layer 42 of the sheet tube portion 4b when the lid 2 is unopened, and a welding mark 14 indicating the welding state when the lid 2 is unopened is formed on the surface of the mouth portion facing layer 12c at the moment of opening. As a result, the welding mark 14 is provided on the surface of the mouth portion facing layer 12c after opening. In this embodiment, the welding traces 14 are formed not only on the mouth-facing layer 12c (the inner peripheral surface of the mouth 12) but also continuously on the end surface of the mouth 12.

[0034] The weld mark 14 is annular and is formed around the entire circumferential direction of the mouth portion 12. When the lid 2 is in the closed state, the weld mark 14 and the outer layer 42 of the plug portion 23 face each other and come into contact with each other.

[0035] Furthermore, the mouth portion 12 has a weld mark adjacent surface 15 that is adjacent to the weld mark 14 in the penetration direction of the mouth portion 12 (the rear side of the container body 1). The weld mark 14 is recessed in the diameter direction of the mouth portion 12 from the weld mark adjacent surface 15. In this embodiment, the weld mark 14 is formed on the inner peripheral surface of the mouth portion 12, so the diameter (diameter) 14D of the weld mark 14 is larger than the diameter (diameter) 15D of the weld mark adjacent surface 15.

[0036] A high-frequency welding machine is used to weld the lid 2 to the container body 1. When a high-frequency welding machine is used on a container with the lid 2 closed, the metal, i.e., the metal foil 41, is more easily heated than the resin in the sheet material 4 by the high frequency, and the heat of the metal foil 41 (particularly the metal layer tubular portion 41a) is transferred from the surface layer 42 to the mouth-facing layer 12c. Since the melting point of the mouth-facing layer 12c is lower than that of the surface layer 42, only the mouth-facing layer 12c melts without melting the surface layer 42, so that the mouth-facing layer 12c is welded to the surface layer 42 in a separable manner. If not only the mouth-facing layer 12c but also the surface layer 42 melts, the mouth-facing layer 12c and the surface layer 42 become one and cannot be separated. It is desirable that the melting points of the surface layer 42 and the mouth-facing layer 12c are as different as possible, and for example, the melting point of the surface layer 42 is higher than the melting point of the mouth-facing layer 12c by 30°C or more, preferably by 50°C or more, and more preferably by 100°C or more. Before using the high frequency welding machine, the mouth portion facing layer 12c and the surface layer 42 are in close contact with each other.

[0037] As shown in Fig. 2, the container of the second embodiment of the present invention differs from the container of the first embodiment in that the plug portion 25 of the lid 2 is a type that closes the mouth portion 12 of the container body 1 from the outside, that is, an external plug type. Note that in the container of the second embodiment, components that are substantially the same as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment in the text and Fig. 2.

[0038] The plug portion 25 comprises a plug plate portion 25a which covers the end face and opening of the mouth portion 12, and a plug wall portion 25b which extends from the outer periphery of the plug plate portion 25a to cover the outside of the mouth portion 12 in the aperture direction. The plug plate portion 25a is also the lid plate portion 21 and is disk-shaped. The plug wall portion 25b is a portion of the lid outer wall portion 22 closer to the lid plate portion 21 than the female screw portion 22a and is cylindrical. In other words, the lid plate portion 21 and the lid outer wall portion 22 have a role as the plug portion 25 that closes the mouth portion 12 in a state of contact from the opening direction in addition to the essential role of the lid 2 that is to close the mouth portion 12. The lid outer wall portion 22 and the plug portion 25 are directly integrated without being interposed between them. Incidentally, the plug wall portion 25b protrudes inward in the opening direction from a portion 25c of the lid outer wall portion 22 adjacent to the opening side of the lid 2 relative to the plug wall portion 25b (hereinafter referred to as the "opening side adjacent portion"). The inner surface (the lower surface in the figure) of the plug plate portion 25a and the end face of the mouth portion 12, as well as the inner peripheral surface of the plug wall portion 25b and the outer peripheral surface of the mouth portion 12 are all detachably welded when unopened, and after opening, they face each other and come into contact when the lid 2 is in the closed state. Meanwhile, with the lid 2 in the closed state, a gap G is formed between the inner peripheral surface of the opening side adjacent portion 25c and the outer peripheral surface of the mouth portion 12 when unopened and when the lid 2 is in the closed state after opening. The plug portion 25 is formed by integrating the part 3b (hereinafter referred to as the "outer plug main body") that forms the outer shape of the plug plate portion 25a and the plug wall portion 25b of the resin lid main body 3, and a sheet material 4 that covers the inner surface of the outer plug main body portion 3b of the lid main body 3.

[0039] The inner surface of the outer plug main body 3b is made up of a cylindrical inner circumferential surface facing the outer side in the diametric direction of the mouth 12 on the cover plate 21 side relative to the female thread portion 22a, a circular bottom surface covering the end face of the mouth 12, and an annular surface protruding in a stepped manner in the diametric direction from the opening side adjacent portion 25c of the cover plate 21. A sheet material 4 is disposed so as to cover the entire inner surface of the outer plug main body 3b.

[0040] The sheet material 4 has the same laminated structure as the first embodiment, and is laminated on the lid main body 3 in the order of adhesive layer 43, metal layer 41 (metal foil), and protective layer 42 (surface layer). Before insert molding the lid 2, the sheet material 4 is formed by pressing into a shape that corresponds to the inner surface of the outer plug main body 3b, more specifically, into a hat shape (a hat shape with a brim). The sheet material 4 is formed by pressing so that the adhesive layer 43 faces the convex side of the hat shape.

[0041] The welding mark 14 is formed on the outer peripheral surface of the mouth portion 12. In other words, the welding mark 14 is formed on the mouth portion facing layer 12c including the outer peripheral surface of the mouth portion 12 around the entire circumference in the circumferential direction, and has a cylindrical surface shape. The welding mark 14 is formed not only on the outer peripheral surface of the mouth portion 12, but also continuously on the end surface of the mouth portion 12. In addition, a parting line PL by insert molding is formed on the surface of the container body 1 in a state where it extends along the inner side of the welding mark 14 of the mouth portion 12 in the depth direction of the container body 1.

[0042] Furthermore, the mouth portion 12 has a weld mark adjacent surface 15 adjacent to the weld mark 14 in the penetration direction of the mouth portion 12 (the rear side of the container body 1). The weld mark 14 is recessed in the diameter direction of the mouth portion 12 from the weld mark adjacent surface 15. In this embodiment, the weld mark 14 is formed on the outer peripheral surface of the mouth portion 12, so the diameter (diameter) 14D of the weld mark 14 is smaller than the diameter (diameter) 15D of the weld mark adjacent surface 15.

[0043] In the containers of the first and second embodiments described above, the mouth-facing layer 12c is welded to the surface layer 42 of the plug portion 25 so as to be separable when the container is unopened, and therefore, when the container is opened, the user feels a force separating the mouth-facing layer 12c and the surface layer 42, that is, a sensation of opening the container. Since the weld marks 14 are formed all around the circumference of the mouth portion 12, it can be confirmed that the inner peripheral surface of the mouth portion 12 and the surfaces of the plug portions 23 and 25 facing the mouth diameter direction, as well as the end surface of the mouth portion 12 and the inner surface of the lid plate portion 21, are sealed by welding when the container is unopened. Furthermore, when the mouth-facing layer 12c and the surface layer 42 are separated from each other when the container is opened, a cracking sound is generated, and the user is also given the sensation of opening the container as a sound. In other words, the mouth-facing layer 12c is welded to the surface layer 42 to such an extent that a breaking sound is generated. Furthermore, the structure of the container (mouth-facing layer 12c and surface layer 42) which maintains the quality of the contents when unopened continues to exist in substantially the same state even after opening, and when the lid 2 is closed after opening, the weld mark 14 of the mouth-facing layer 12c and the surface layer 42 of the stopper portion 25 face each other and come into contact, so that the quality of the contents can be maintained in substantially the same state before and after opening.

[0044] In addition, in the containers of the first and second embodiments, the metal layer 41 has a cylindrical metal layer tube portion 41a arranged concentrically with the mouth portion 12 and a metal layer bottom portion 41b closing one side in the penetration direction of the metal layer tube portion 41a, so that compared to a case in which the metal layer bottom portion 41b is not present, gas is less likely to enter or exit the container body 1 from the mouth portion 12 when the lid 2 is closed, and the quality of the contents can be maintained. Moreover, when looking at the inside of the lid 2 after opening, the metal foil 41 can be seen through the protective layer 42, so the user can confirm that the quality of the contents is maintained by the metal foil 41.

[0045] In addition, in the containers of the first and second embodiments, the weld mark 14 is recessed in the diameter direction of the mouth portion 12 further than the weld mark adjacent surface 15, so that at least when the container is unopened, the degree of adhesion between the surface layer 42 of the plug portion 25 and the mouth-facing layer 12c is higher than in a case where the weld mark is not recessed, and the quality of the contents can be maintained.

[0046] In the containers of the first and second embodiments, the surface layer 42 is made of resin and is integrated with one side of the metal layer 41 in the diameter direction, so that the metal layer 41 is less likely to be damaged and the quality of the contents can be maintained.

[0047] Furthermore, the containers of the first and second embodiments are configured to include a resin lid main body 3 and a sheet material 4, and the adhesive layer 43 of the sheet material 4 is made of a resin having a lower melting point than the surface layer 42 and is welded to the lid main body 3 to form an integrated unit. This makes the metal layer (metal foil) 41 less susceptible to damage, and allows the quality of the contents to be maintained.

[0048] Furthermore, the containers of the first and second embodiments are configured such that the container body 1 is provided with a male thread portion 12a and the lid outer wall portion 22 of the lid 2 is provided with a female thread portion 22a, so that the opening operation is clear and the container can be opened simply by twisting the lid 2, making it easy to separate the plug portion 25 from the mouth portion 12 when opening.

[0049] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention.

[0050] For example, in the first embodiment, the plug portion is an inner plug and is disk-shaped, but in the present invention, it is not limited to this and may be cylindrical. In this case, the thickness of the cylinder (thickness in the aperture direction) need only be a dimension that ensures close contact between the mouth portion 12 and the plug portion.

[0051] In addition, in the second embodiment, the plug portion was an outer plug and was part of the lid outer wall portion 21, but the present invention is not limited to this, and it may be something that protrudes from the lid plate portion 21 while being spaced apart inward in the diameter direction from the lid outer wall portion 22, that is, it may be an object independent of the lid outer wall portion 22.

[0052] In the first and second embodiments, the metal layer 41 is configured to include the metal layer cylindrical portion 41a, the metal layer bottom portion 41b, and the metal layer flange portion 41c, but the present invention is not limited to this, and may include only the metal layer cylindrical portion 41a, in which case the portion corresponding to the metal layer bottom may be made of resin. The resin of the portion corresponding to the metal layer bottom may be made of EVOH (ethylene-vinyl alcohol copolymer) to prevent gas from entering and exiting the container body from the opening as much as possible, and to maintain the quality of the contents as much as possible. [Explanation of symbols]

[0053] 1 Container body 11 Storage section 12 Mouth 12a Male thread 12c Mouth facing layer 14 Welding marks 14D caliber 15 Adjacent surface of welding site 15D caliber 2 lid 21 Lid plate part 22 Lid outer wall 22a Female thread 23 Stopper part 23a Outer surface 23b Bottom 23D diameter 23H Height 25 Plug part 25a Plug plate part 25b Plug wall 25c Adjacent to the opening 3 Lid main body 3a Inner plug body 3b Outer plug main body 4 Sheet material 4a Seat bottom 4b Seat tube 4c Seat flange 41 Metal foil (metal layer) 41a Metal layer cylinder part 41b Bottom of metal layer 41c Metal layer flange 42 Protective layer (surface layer) 43 Adhesive layer G Gap PL parting line

Claims

1. The container has a container body and a lid that is detachable from the container body. The lid has a plug portion that fits into the mouth of the container body so as to close the opening, The plug portion has a cylindrical metal layer arranged concentrically with the mouth portion, the mouth portion has a mouth portion facing layer including a surface facing the plug portion in a diameter direction, The container is characterized in that the mouth-facing layer is made of a resin having a lower melting point than a surface layer including the surface of the stopper, and is detachably welded to the surface layer of the stopper when unopened, and after opening, has weld marks around the entire circumference of the mouth that indicate the welded state when unopened.

2. 2. The container according to claim 1, wherein the metal layer comprises a cylindrical metal layer portion arranged concentrically with the mouth portion, and a metal layer bottom portion closing one side of the metal layer cylindrical portion in the penetrating direction.

3. the mouth portion has a weld trace adjacent surface adjacent to the weld trace in a penetration direction of the mouth portion, 3. The container according to claim 1, wherein the weld mark is recessed in the direction of the mouth diameter from a surface adjacent to the weld mark.

4. 4. The container according to claim 1, wherein the surface layer is made of resin and is integral with one surface side of the metal layer in the diameter direction.

5. The lid includes a resin lid body forming a base of the lid, and a sheet material welded to a part of the lid body. The sheet material includes a metal layer and a surface layer, and a resin adhesive layer that is integral with the other surface side of the metal layer in the diameter direction.

5. A container according to claim 4, wherein the adhesive layer has a melting point lower than that of the surface layer and is integrally welded to the lid body.

6. The container body is equipped with a male screw for opening and closing.

6. The container according to claim 1, wherein the lid has an outer lid wall portion having a female screw portion formed on its inner circumferential surface for opening and closing, and the outer lid wall portion and the plug portion are integral with each other.

7. 7. The container according to claim 1, wherein the plug is an inner plug that closes the mouth from the inside.

8. The container according to any one of claims 1 to 6, wherein the plug portion is an outer plug that closes the mouth portion from the outside, and comprises a plug plate portion that covers the end face and the opening of the mouth portion, and a plug wall portion that extends from the outer periphery of the plug plate portion in a state of covering the outside in the diameter direction of the mouth portion.

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