JP5002924B2 - Container sealing structure and lid used therefor - Google Patents

Description

  The present invention seals a container mouth with a sealing member, and further attaches a lid, thereby ensuring high sealing performance and easily opening and peeling the sealing member, and a sealing structure for the container. It relates to the lid.

  For example, in Patent Document 1, an opening of a container body is bonded and sealed with an adhesive strength that can be peeled off by an inner lid made of a plastic sheet, and an outer lid is placed on the inner lid and screwed to the container body. A retort plastic container is disclosed. According to the plastic container for retort disclosed in Patent Document 1, the inner lid that seals the container is not peeled off during the retort sterilization treatment, and the inner lid is easily peeled off when opened. I can do it.

  Patent Document 2 discloses a pouch in which a seal member is thermally welded to the top surface of a dispensing cylinder, and a cap provided with a contact ring that contacts the top surface of the dispensing cylinder is screwed to the dispensing cylinder. A spout for use is disclosed. According to the spout for a pouch disclosed in Patent Document 2, the seal member is pressed by the contact ring and can improve the sealing performance of the seal member. Therefore, it is not necessary to increase the adhesive force of the seal member more than necessary. , At the time of pouring, the seal member can be easily opened and peeled off.

  In Patent Document 3, the outer peripheral edge of the sealing material is welded to the outer surface of the opening end of the mouth portion, and the sealing material for sealing the opening end of the mouth portion is pressed by a dome-shaped protrusion provided on the back surface of the cap. A packaging bag with a mouth portion which is made to be disclosed is disclosed. According to the packaging bag with a mouth portion disclosed in Patent Document 3, the dome-shaped protrusions are in close contact with the sealing material without damaging the sealing material, and water is applied to the upper surface of the sealing material that seals the mouth portion during the heat treatment. It can be prevented from entering.

JP-A-6-219464 JP 2002-104453 A JP 2004-224355 A

  However, in the container of Patent Document 1, although the inner lid made of a plastic sheet is pressed against the upper surface of the container opening by the packing made of silicon rubber provided on the inner surface of the outer lid, When the pressure inside the container rises during a drop impact or the like and the inner lid is lifted toward the inner surface of the outer lid against the elastic force of the packing, There is a problem that the inner lid peels off. Thus, if peeling occurs even in a part of the inner peripheral side of the inner lid, the contents may enter the part, which may cause discomfort to the purchaser at the time of opening. Therefore, it is not preferable.

  Especially in the case of containers made of flexible materials such as pouches with spouts and squeeze bottles, the containers will be greatly deformed when they are subjected to impacts due to falling during the distribution process or when the handler holds the container strongly. However, the degree of increase in internal pressure at this time also increases. Along with this, the impact applied to the inner lid when the internal pressure rises also increases, so that the above problem tends to become prominent. Such a problem is similarly pointed out even in the pouch spout of Patent Document 2. Yes.

Moreover, according to the packaging bag with a mouth part of patent document 3, since the dome-shaped protrusion provided in the back surface of the cap is contact | abutting to the inner peripheral edge side of an opening end, there is little possibility that said problem will arise.
However, in the configuration disclosed in Patent Document 3, it is necessary to weld the outer peripheral edge of the sealing material to the outer surface of the opening end in order to prevent the peeling of the sealing material when the dome-shaped protrusion presses the sealing material. For this reason, even if the tab portion for peeling is left, there is a problem that it becomes difficult to cleanly remove the sealing material from the mouth portion when the sealing material is opened and peeled. Furthermore, since the sealing material is in close contact with the dome-shaped protrusion, there is no escape space when the pressure in the container becomes high during high temperature sterilization or drop impact, etc., and it is also impossible to absorb the increase in internal pressure. is there.

  The present invention has been made in view of the above circumstances, and by sealing the container mouth portion with a sealing material and attaching a lid, the sealing material is peeled off at the time of opening while ensuring high sealing performance. In a container sealing structure that facilitates (opening and peeling), a container that can prevent peeling of the sealing material at the inner peripheral edge of the container mouth even if it receives an impact when dropped or the pressure in the container rises An object of the present invention is to provide a sealing structure and a lid used therefor.

The container sealing structure according to the present invention is a container sealing structure that seals the inside of the container by heat-sealing a sealing member on the upper end surface of the container mouth, and by attaching a lid to the mouth. The lid body is re-sealably attached to the mouth portion, and when the lid body is attached to the mouth portion, the inner edge of the mouth portion does not come into contact with the inner edge of the mouth portion. Also, it is configured to have an inner peripheral projection that protrudes from the inner surface of the top surface of the lid body and is in contact with the seal member so as to be positioned near the inner side.

  With such a configuration, the sealing member can be easily peeled and peeled while ensuring high sealing performance. Further, the sealing material at the inner peripheral edge of the container mouth due to impact during dropping or pressure increase in the container Can be effectively prevented from entering between the upper end surface of the mouth and the seal member.

Moreover, the sealing structure of the container which concerns on this invention can be set as the structure which has the cyclic | annular protrusion which contact | abuts to the said mouth part upper end surface through the said sealing member in the inner surface of the top plate of the said cover body.
With such a configuration, peeling of the sealing member due to an increase in pressure in the container is more reliably prevented, and sterilizing water used during high-temperature sterilization is prevented from entering between the lid and the sealing member. can do.

In addition, the container sealing structure according to the present invention may be configured such that the lid is attached to the mouth so that a gap is formed between the lid and the seal member.
With such a configuration, when the pressure in the container rises, the seal member can be curved upward in the lid to absorb the increase in internal pressure.

In addition, the container sealing structure according to the present invention is configured such that the lid body is attached to the mouth portion so as to be resealable, so that the container can be resealed even after the container is opened. It is to become.

The lid according to the present invention is a lid that is used in the container sealing structure as described above, and is re- sealably attached to a container mouth sealed with a sealing member, and covers the mouth. The top surface of the lid body is provided with a top plate and is positioned closer to the inner side than the inner peripheral edge of the mouth portion without contacting the inner peripheral edge of the mouth portion when mounted on the mouth portion. It can also be set as the structure which has an internal peripheral protrusion which protrudes from the inner surface of this and the front end side contact | abuts to the said sealing member.

  According to the present invention, the container mouth is sealed with a sealing member, and the lid is further attached, thereby facilitating unsealing of the sealing member while ensuring high sealing performance. The inner peripheral protrusion formed on the inner surface prevents peeling of the sealing material at the inner peripheral edge of the container mouth, and effectively prevents the contents from entering between the upper end surface of the mouth and the film material. be able to.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
Here, FIG. 1 is a partially cutaway sectional view of the spout showing an embodiment in which the container sealing structure according to the present invention is applied to a pouch spout. FIG. 2 is an enlarged cross-sectional view of a main part of a portion surrounded by a chain line in FIG.

  A spout 1 shown in FIG. 1 has a spout body 10 having a boat-shaped portion 11 and a cylindrical pouring tube 12 extending upward from the boat-shaped portion 11, and an upper end surface of the opening of the pouring tube 12. The seal member 13 is heat sealed. Further, a thread 14 for screwing the cap 15 is formed on the outer peripheral surface of the dispensing cylinder 12, and the thread 14 is provided with a plurality of draining slits 14a in the circumferential direction. Yes.

  The opening of the dispensing cylinder 12 is sealed with a seal member 13 as shown in the drawing, and a cap 15 is screwed onto the dispensing cylinder 12 so as to cover the sealing member 13. If the cap 15 is attached to the dispensing cylinder 12 by screwing in this way, it is preferable that the cap 15 can be resealed even after opening, but the means for attaching the cap 15 It is not limited.

  Moreover, in the example shown in figure, the boat-shaped part 11 with which the spout main body 10 is provided has the cylindrical part 11a which continues to the extraction | pouring pipe | tube 12, From this cylindrical part 11a, it is triangular shape so that it may become substantially bilaterally symmetrical in the figure. Three welding substrates 11b projecting horizontally and a flange portion 11c positioned at the boundary between the extraction tube 12 and the cylindrical portion 11a are provided.

  The welding substrates 11b are arranged at predetermined intervals along the central axis direction of the cylindrical portion 11a, and are respectively connected up and down by a column portion 11d located on the distal end side. Further, as will be described later, the entire circumference of the side surface of the welding substrate 11b is heat sealed to the spout seal portion 35 of the pouch body 3, and at this time, the flange portion 11c contacts the side of the spout seal portion 35, The pouch body 3 is positioned with respect to the soft wrapping material (see FIG. 4).

  In the present embodiment, the spout body 10 and the cap 15 can be manufactured by a molding means such as injection molding using a thermoplastic resin typified by a polyolefin resin such as polypropylene and polyethylene.

Here, in the present embodiment, the spout 1 is taken as an example, but the present invention can also be applied to various containers such as a bottle-type container.
When the present invention is applied to a bottle-shaped container, the mouth of the bottle-shaped container corresponding to the spout body 10 in the above embodiment can be formed integrally with the container body, and in addition to the above-mentioned polyolefin resin, polyethylene terephthalate In addition, various thermoplastic resins including polyester resins such as polyethylene naphthalate can be used. Bottle type containers can be manufactured by direct blow molding, stretch blow molding, etc., but in the case of stretch blow molding, the container mouth can be shaped during the molding of a preform by injection molding prior to blow molding. .
In any of the embodiments, the cap and the container opening are manufactured by making friends with the above-described resins or other thermoplastic resins, or having a multilayer structure with a functional resin such as an oxygen barrier resin. It can be appropriately manufactured with a known configuration.

Further, as shown in FIG. 3, the sealing member 13 heat-sealed to the upper end surface of the opening of the dispensing tube 12 is made of a substantially circular film material. 13a is protrudingly formed. The projecting piece 13a is provided as a knob piece for facilitating peeling when the seal member 13 is opened and peeled off. When the cap 15 is attached to the dispensing cylinder 12, the inner shape of the cap 15 is followed. When the cap 15 is removed from the dispensing tube 12 by bending, it is preferable that it rises due to its elasticity.
FIG. 3 is a top view showing a state in which the sealing member 13 is heat sealed to the upper end surface of the opening of the dispensing cylinder 12.

  Examples of the film material used for the seal member 13 include a film material having a multilayer structure in which a base material layer, an intermediate layer (barrier layer), and a sealant layer are sequentially laminated via an adhesive layer. However, the specific configuration is required for high-temperature heat sterilization such as hot water sterilization and retort sterilization, as well as required tensile strength, drop impact resistance, pinhole resistance, content resistance, gas barrier properties, etc. Can be appropriately selected in consideration of heat resistance.

  When a film material having the above-mentioned multilayer structure is used as the film material used for the sealing member 13, a base film having excellent mechanical properties such as tensile strength, impact strength, and pinhole resistance is used for the base material layer. Is preferred. Specifically, a biaxially stretched film made of a polyester resin such as polyethylene terephthalate, a polyamide resin such as nylon, a polyolefin resin such as polypropylene, or the like can be used alone or in a laminate.

  For example, a metal such as aluminum, an inorganic oxide such as alumina (aluminum oxide) or silica (silicon oxide) is deposited on such a base film, or a barrier organic material such as polyvinylidene chloride or polyacrylic acid. By coating the material, or by blending an oxygen absorbent composed of an oxygen-absorbing resin containing a oxidizable polymer, a reducing metal compound, etc. in the base film, etc. Barrier properties may be imparted to the base film itself.

Moreover, the synthetic resin film provided with the barrier property with respect to various gas and water vapor | steam can be used for an intermediate | middle layer.
Examples of such a synthetic resin film include an ethylene-vinyl alcohol copolymer film; a vinylidene chloride copolymer film; a crystalline polyamide film (nylon) obtained from a polycondensation reaction between metaxylenediamine (MXDA) and adipic acid. MXD6); Acrylonitrile copolymer film; Polyglycolic acid and its copolymer film; Polyglycolic acid film; Clay-based nanocomposite synthetic resin film; Inorganic film deposition film; Barrier organic such as polyvinylidene chloride and polyacrylic acid Material coating film: Clay-based nanocomposite material coating film based on thermosetting resin such as phenol resin, epoxy resin, and polyimide resin. In these films, an oxygen absorbent containing an oxidizing polymer or the like, an oxygen absorbent made of a reducing metal compound, or the like may be appropriately blended. In the case where transparency is not required, as other materials for imparting barrier properties, metal foils (including alloy foils) such as aluminum foil and steel foil can also be used.

In addition, the sealant layer has heat sealability (which means that it can be melted, diffused and re-solidified at a temperature lower than the melting point of the material constituting the base material layer), heat seal strength, heat resistance (heat at high temperature) Seal strength), content resistance, hygiene, etc. are required.
As a synthetic resin material having heat sealability applicable to such a sealant layer, when the spout 1 is composed of a polyolefin resin, for example, low density polyethylene, linear low density polyethylene (Ziegler type (multisite Catalyst), metallocene (single site catalyst)), ethylene-α olefin copolymer, olefin copolymer graft-modified with ethylenically unsaturated carboxylic acid or its anhydride, medium density polyethylene, high density polyethylene, polypropylene, Some of propylene-ethylene copolymer, polybutene-1, polymethylpentene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid copolymer, etc. Ion-crosslinked olefin copolymer with a metal ion group introduced into ), Polyolefin resins such as ethylene-tetracyclododecene copolymer (cyclic olefin copolymer); aromatic vinyl copolymers such as polystyrene and styrene-butadiene copolymer; polyvinyl chloride, polyvinylidene chloride, etc. Vinyl halide resins; Acrylonitrile copolymers such as acrylonitrile-styrene copolymers and acrylonitrile-butadiene-styrene copolymers; Polylactic acid resins (including polymesolactide blended systems); Polyesters having a relatively low melting point such as polybutylene terephthalate Resin etc. are mentioned. These resins may be used alone, or may be used by blending several kinds as necessary.

  When the spout 1 is composed of a polyester-based resin, the synthetic resin material used for the sealant layer is polyethylene terephthalate or polybutylene terephthalate, a polyvalent carboxylic acid component such as isophthalic acid or adipic acid, and 1,4- It is preferable to use a copolyester modified with a polyhydric alcohol component such as butanediol or 1,4-cyclohexanedimethanol. And easy peelability can be provided to a sealant layer by blending incompatible synthetic resin materials, such as polyethylene and a polypropylene, with such a copolyester.

  In addition, as a material for forming an adhesive layer that bonds these layers, polyurethane resins such as polyether polyurethane resins and polyester polyurethane resins, polyester resins, epoxy resins, acrylic resins, and polar groups are introduced. Olefin-based resin and the like.

  When using a film material having such a multilayer structure as the sealing member 13, the synthetic resin film forming each layer can be obtained by an ordinary method such as a casting method, a T-die method, a calendar method, or an inflation method. Such a film material having a multilayer structure can be obtained by a conventional method such as a dry lamination method of a pre-formed film, a sandwich lamination method using a molten resin, a laminate coating method, a melt coextrusion method, or the like. At this time, in order to improve the adhesion of each layer of the base material layer, the intermediate layer, and the sealant layer, the surface in contact with the adhesive layer of each layer is subjected to corona discharge treatment, flame treatment (flame treatment), ultraviolet treatment, Surface modification treatment using ozone treatment, primer coating treatment (coating alkyl titanate, polyethyleneimine, silane coupling agent, isocyanate compound, polyurethane compound, etc.) can be performed.

  Further, in the illustrated example, the cap 15 includes a top plate 15a that covers the opening of the pour tube 12, and the pour tube is disposed on the inner peripheral surface of the cylindrical wall 15c that hangs down from the periphery of the top plate 15a. Screw grooves 15b corresponding to the twelve screw threads 14 are formed. Furthermore, an annular protrusion 15 d that abuts on the upper end surface of the opening of the dispensing cylinder 12 through the seal member 13 is formed on the inner surface of the top plate 15 a. The annular protrusion 15d is formed along the upper end surface of the opening of the dispensing cylinder 12, and the seal member 13 is pressed against the upper end surface of the opening of the dispensing cylinder 12 by the annular protrusion 15d.

  In this way, even when the seal member 13 is lifted upward due to an increase in internal pressure during high temperature sterilization or a drop impact, the seal member 13 peels from the upper end surface of the opening of the dispensing tube 12. Can be effectively avoided, and the sealing performance of the container (pouch) can be maintained.

Therefore, in the present embodiment in which the seal member 13 is prevented from being peeled off by the cap 15 attached to the dispensing tube 12, the seal strength of the seal member 13 is high-temperature sterilization after filling and sealing the contents. Or, it is not necessary to consider peeling in the distribution process, etc., and priority can be given to easy peelability, for example, within a range of 5 to 25 N / 15 mm, especially by setting it to 15 N / 15 mm or less, Easy peelability of the sealing member 13 can be realized.
When retort sterilization is performed as high-temperature sterilization, the seal strength is set to 23 N / 15 mm or more according to related laws and regulations, but the seal strength of the seal member 13 can be selected within this range.

  Further, when the sterilizing water used at the time of high temperature sterilization enters between the cap 15 and the seal member 13 and the product is placed in the distribution process with this remaining, it is misunderstood as if the contents leaked out. Although there is a possibility, according to the present embodiment, the annular protrusion 15 d is in contact with the upper end surface of the opening of the dispensing cylinder 12 through the seal member 13, so that the sterilizing water can reach the upper surface of the seal member 13. It can also prevent intrusion.

Further, in the illustrated example, on the inner surface of the top plate 15a of the cap 15, an annular inner peripheral protrusion 15e located on the inner peripheral side of the annular protrusion 15d is concentrically formed with the annular protrusion 15d. Is formed. When the cap 15 is mounted on the dispensing cylinder 12, the inner circumferential protrusion 15 e is in the state where the cap 15 is mounted on the dispensing cylinder 12 so that the distal end side of the inner circumferential protrusion 15 e contacts the seal member 13. It is formed with a protruding length such that the tip is at a position below the horizontal plane formed by the upper end surface of the opening of the dispensing cylinder 12 (see FIG. 2).
In the example shown in the figure, the tip of the inner peripheral projection 15e is positioned below the horizontal plane including the upper end surface of the opening of the extraction cylinder 12, but the tip of the inner peripheral projection 15e is at least poured out. It suffices to be positioned on a horizontal plane including the upper end surface of the opening of the cylinder 12 and to be in contact with the seal member 13.

According to the present embodiment, by forming such an inner peripheral protrusion 15e, when a force is generated to lift the seal member 13 upward with an increase in internal pressure, the inner peripheral protrusion is resisted. 15e presses the seal member 13 located in the vicinity of the inner peripheral edge of the opening of the dispensing cylinder 12, and prevents the sealing member 13 from peeling off from the upper end surface of the opening at the inner peripheral edge of the opening of the extracting cylinder 12. Can do.
That is, in the present embodiment, the annular protrusion 15d described above prevents the entire peeling from the upper end face of the opening of the seal member 13, whereas the inner peripheral protrusion 15e is formed at the inner periphery of the opening. The main purpose is to prevent partial peeling of the seal member 13.

  Here, if the formation position of the inner peripheral protrusion 15e is too far from the inner peripheral edge of the opening, it is possible to prevent the seal member 13 positioned in the vicinity of the inner peripheral edge of the dispensing cylinder 12 from being lifted upward when the internal pressure is increased. Thus, the function of preventing the peeling of the sealing member 13 at the inner peripheral edge of the opening of the dispensing cylinder 12 is impaired. For this reason, the formation position of the inner peripheral protrusion 15e is a position between the inner peripheral edge of the opening and about half of the opening radius of the extraction cylinder 12, and the extraction cylinder 12 is not separated from the inner periphery of the opening. It is necessary to form it at a position closer to the inner side than the inner peripheral edge of the opening.

  If the sealing member 13 is peeled even at a part of the inner peripheral edge of the opening of the dispensing cylinder 12 or if there is an unsealed portion with the sealing member 13, the contents enter the portion, and the sealing member However, according to the present embodiment, the inner surface of the top plate 15a with which the cap 15 is provided with the inner peripheral projection 15e that comes into contact with the seal member 13 may be provided. By forming the seal member 13 on the outer peripheral side of the inner peripheral projection 15e, the seal member 13 is prevented from being lifted beyond the upper end surface of the opening portion of the extraction tube 12, and the seal member 13 is thereby prevented from being discharged. 12 can be maintained in close contact with the upper end surface of the opening 12, so that it is possible to effectively avoid the entry of the contents between the upper end surface of the opening 12 of the dispensing cylinder 12 and the seal member 13. Rukoto can.

  In the present embodiment, the inner peripheral protrusion 15e is not limited to an annular shape, and may be formed by arranging a plurality of small protrusions in an annular shape as long as the above-described function is obtained. The specific configuration can be appropriately changed within a range in which the above functions are not impaired.

  In the illustrated example, when the cap 15 is mounted on the dispensing cylinder 12, a predetermined gap 2 is formed between the cap 15 and the seal member 13. As a result, as shown by a two-dot broken line in FIG. 2, when the internal pressure rises, the seal member 13 bends upward in the cap 15 to absorb the increase in internal pressure during high temperature sterilization or drop impact. As a result, the impact applied to the seal member 13 when the internal pressure is increased is mitigated.

The spout 1 as described above is used, for example, by being attached to a pouch body 3 as shown in FIG. 4 as a spout for contents.
In the illustrated example, the pouch body 3 is composed of a body portion 31 and a bottom portion 32 formed of a soft packaging material such as a resin film. A side seal 33 is applied to the side periphery of the body 31 with the bottom 32 folded at a fold line 32 a, and a bottom seal 34 is applied between the body 31 and the bottom 32. Yes. In addition, an inclined portion 4 that is obliquely cut is provided at the upper left corner in the figure. In the spout seal portion 35 of the inclined portion 4, the entire circumference of the side surface of the welding substrate 11b of the spout 1 is pouched. It is heat-sealed to the soft packaging material that forms the main body 3.

  Such a pouch with a spout is usually conveyed to the filling step of the contents with the top portion being an unsealed portion, and after the contents are filled, the top seal 36 is applied to the top portion. At this time, the spout 1 attached as the spout has the opening of the spout cylinder 12 sealed with the seal member 13 and the cap 15 is mounted on the spout cylinder 12 so as to cover the seal member 13. Yes. For this reason, even if the sealing strength of the sealing member 13 is easily peelable, the contents can be filled and sealed with high sealing performance. When the contents are poured out, the seal member 13 is opened and peeled after the cap 15 is removed, but the seal member 13 can be heat-sealed with easy peel strength, and the seal member 13 can be easily removed. It can be made to peel open.

  Although the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

  For example, in the above-described embodiment, the inner peripheral projection 15e is formed on the inner peripheral side of the cap 15 with the annular projection 15d that contacts the upper end surface of the opening of the extraction tube 12 via the seal member 13 on the inner surface of the top plate 15a. However, if only the inner peripheral projection 15e can prevent peeling from the upper end surface of the opening of the seal member 13 and sufficiently secure the sealing performance, the annular projection 15d is omitted as necessary. May be.

  Moreover, although the example which applied this invention to the spout for pouch was given in embodiment mentioned above, the container which can apply this invention is not restricted to a pouch as mentioned above. For example, the present invention can be applied to squeeze bottles containing mayonnaise and the like, and wide-mouth containers containing jam and the like, but the present invention can be applied by dropping in the distribution process such as pouches and squeeze bottles. The container is particularly suitable for a container made of a flexible material which is greatly deformed when an impact is applied or when a handler strongly holds the container and the degree of increase in internal pressure is large.

  As described above, according to the present invention, the container mouth is sealed with a sealing member, and the sealing of the container facilitates opening and peeling of the sealing member while ensuring high sealing performance by attaching a lid. As a structure, it can be used for various containers.

It is a partially cutaway sectional view showing the outline of the embodiment which applied the sealing structure of the container concerning the present invention to the spout for pouches. It is a principal part expanded sectional view of embodiment shown in FIG. It is a top view which shows the state which heat-sealed the sealing member to the opening part upper end surface of the extraction pipe | tube. It is a front view which shows an example of a pouch with a spout.

Explanation of symbols

1 Spout 10 Spout body 12 Pouring pipe (container opening)
13 Seal member 15 Cap (lid)
15a Top plate 15d Annular projection 15e Inner circumferential projection 2 Gap

Claims (5)

The container sealing structure seals the inside of the container by heat-sealing a sealing member on the upper end surface of the container mouth and attaching a lid to the mouth,
The lid is attached to the mouth portion so as to be resealable,
When the lid is attached to the mouth, the top surface of the lid is positioned so as to be closer to the inner side than the inner periphery of the mouth without contacting the inner periphery of the mouth. A container sealing structure, characterized in that it has an inner peripheral protrusion that protrudes from the inner surface and a front end of which abuts against the seal member.   2. The container sealing structure according to claim 1, further comprising: an annular protrusion that is in contact with the upper end surface of the mouth portion through the seal member on an inner surface of the top plate of the lid body.   The container sealing structure according to claim 1, wherein the lid is attached to the mouth so that a gap is formed between the lid and the seal member. A lid body removably attached to a container mouth sealed with a sealing member,
A top plate covering the mouth,
When attached to the mouth, it protrudes from the inner surface of the top surface of the lid so that it is positioned closer to the inner side than the inner edge of the mouth without contacting the inner edge of the mouth. The lid body has an inner peripheral projection that abuts against the seal member. The lid according to claim 4 , further comprising: an annular protrusion on an inner surface of the top plate that contacts an upper end surface of the mouth portion via the seal member.

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