KR20080033255A - Sealing structure for container and cap used for the same - Google Patents

Abstract

A seal member (13) is heat sealed on the upper surface of a container opening (12), and a cap (15) is installed on the container opening (12). The cap (15) has a top plate (15a) covering the container opening (12) and also has, on the inner surface of the top plate (15a), an inner periphery projection (15e) located in the vicinity of a position more on the inner side than the inner peripheral edge of the container opening (12). The construction facilitates separation (separation for opening) of the seal member (13) with high sealing ability maintained, and prevents separation of the seal member (13) at the inner peripheral edge of the container opening (12) caused by a rise in pressure in the container.

Description

Seal structure of container and cap used for this {SEALING STRUCTURE FOR CONTAINER AND CAP USED FOR THE SAME}

The present invention relates to a sealing structure of a container in which a container inlet portion is sealed with a sealing member, and that a cap is attached, thereby ensuring high sealing property and facilitating peeling of the sealing member, and a cap used for the same.

For example, Japanese Unexamined Patent Application Publication No. 6-219464 seals and seals the opening of the container body with an adhesive strength that can be peeled off by an inner cap made of a plastic sheet. Disclosed is a plastic container for a still, which is screwed. According to the plastic container for a distiller disclosed by Unexamined-Japanese-Patent No. 6-219464, when the sterilization process is carried out with a distiller, the inner cap which seals a container can be peeled easily, when opening, without peeling.

In addition, Japanese Patent Laid-Open No. 2002-104453 discloses a cap provided with a contact ring contacting the ceiling surface of a spout cylinder by heat-sealing a sealing member on the ceiling surface of a spout. The spout for pouches which are screwed into the spout is disclosed. According to the spout for pouches disclosed in Japanese Patent Application Laid-Open No. 2002-104453, the sealing member can be pressed by the contact ring to improve the sealing property of the sealing member, so that the adhesive force of the sealing member does not need to be stronger than necessary. In this case, the sealing member can be easily opened and peeled off.

Further, Japanese Patent Laid-Open No. 2004-224355 discloses a sealant which seals the opening end of the inlet by a hemispherical protrusion formed on the back of the cap while welding the outer peripheral edge of the sealant to the outer surface of the inlet. A packaging bag having an inlet portion which is pressed in is disclosed. According to the packaging bag with the inlet part disclosed in Japanese Patent Laid-Open No. 2004-224355, the hemispherical protrusion can be in close contact with the sealing material without damaging the sealing material, and water can be prevented from invading the upper surface of the sealing material which is sealed at the inlet part during heat treatment. It is supposed to be.

Disclosure of the Invention

Problems to be Solved by the Invention

However, in the container of Japanese Unexamined Patent Publication No. 6-219464, the inner cap made of plastic sheet is pressed on the upper surface of the container opening by the packing made of silicone rubber provided on the inner surface of the outer cap. When the pressure in the container rises on the back and the inner cap is raised toward the inner surface of the outer cap against the elastic force of the packing, there is a problem that the inner cap is peeled from the upper surface of the opening on the inner circumferential side of the upper surface of the opening. Thus, when peeling generate | occur | produces even a part of the inner peripheral side of an inner cap, since the contents may enter into the part, it may not be preferable to the buyer at the time of opening.

In particular, in containers made of flexible materials such as spouted pouches or squeeze bottles, the container is greatly deformed when an impact caused by a drop is applied during distribution, or when the handler holds the container hard, and the pressure increase at this time also increases. Accordingly, the above-mentioned problem tends to be remarkable since the impact applied to the inner cap also increases when the pressure resistance increases, and this problem is similarly pointed out in the spout for pouches of Japanese Patent Laid-Open No. 2002-104453.

Moreover, according to the packaging bag with the entrance part of Unexamined-Japanese-Patent No. 2004-224355, since the hemispherical protrusion formed in the back of the cap contacts the inner peripheral edge side of an opening end, there is little possibility that the said problem arises. However, in the configuration disclosed in Japanese Patent Laid-Open No. 2004-224355, it is necessary to weld the outer peripheral edge of the sealing material to the opening end face in order to prevent peeling of the sealing material when the hemispherical protrusion presses the sealing material. Therefore, even if the tab part for peeling is left, there exists a problem that it becomes difficult to remove a sealing material from an entrance part neatly when opening and peeling a sealing material. In addition, since the sealing material is in close contact with the hemispherical protrusion, there is also a problem that there is no escape when the pressure in the container is increased during high temperature sterilization or drop impact, so that the increase in the internal pressure cannot be absorbed.

The present invention has been made in view of the above circumstances, and in the sealing structure of a container which seals the container inlet part with a sealing material and facilitates peeling (opening and tearing) off of the sealing material at the time of opening while securing a high sealing property by attaching a cap. An object of the present invention is to provide a sealing structure of a container capable of preventing peeling of the sealing material at the inner circumferential edge of the container inlet part even when subjected to a dropping impact or an increase in the pressure in the container.

Means to solve the problem

The sealing structure of the container according to the present invention is a sealing structure of the container for sealing the inside of the container by heat-sealing the sealing member on the upper surface of the container inlet and attaching a cap to the inlet. The inner surface of the upper plate of the cap is configured to have an inner circumferential protrusion which is located closer to the inner side than the inner circumferential edge of the inlet portion and contacts the sealing member.

This configuration facilitates peeling of the sealing member while ensuring high sealing properties, and prevents peeling of the sealing material at the inner circumferential edge of the container inlet part due to the impact at the time of dropping or an increase in the internal pressure in the container. The entry of the contents between the top surface and the sealing member can be effectively avoided.

In addition, the sealing structure of the container according to the present invention can be configured to have an annular projection on the inner surface of the upper plate of the cap in contact with the upper end surface of the inlet portion through the sealing member.

Such a construction can more reliably prevent peeling of the sealing member due to the pressure rise in the container, and at the same time, it can prevent the sterilizing water or the like used at high temperature sterilization from entering between the cap and the sealing member.

Moreover, the sealing structure of the container which concerns on this invention can be set as the structure which attached the said cap to the said inlet part so that the space | gap is formed between the said cap and the said sealing member.

With such a configuration, when the pressure in the container rises, the sealing member can be bent upward in the cap to absorb the internal pressure increase.

Moreover, the sealing structure of the container which concerns on this invention can be set as the structure attached to the said inlet part so that the said cap can be resealed.

With such a configuration, it is possible to enable the resealing treatment by the cap even after opening the container.

In addition, the cap according to the present invention is used for the sealing structure of the container as described above, and the cap is mounted on the container inlet part sealed by the sealing member, and includes a top plate covering the inlet part, and when the cap is attached to the inlet part. The inner periphery of the upper plate is located near the inner periphery of the inlet and is in contact with the sealing member, and the cap according to the present invention has the inlet through the sealing member on the inner surface of the upper plate. It can be set as the structure which has the annular protrusion which contact | connects the upper end surface of a part.

Effects of the Invention

According to the present invention, the container inlet portion is sealed with a sealing member, and a cap is attached to the container inlet portion by an inner circumferential protrusion formed on the inner surface of the ceiling of the cap to facilitate opening and closing of the sealing member while ensuring high sealing property. Peeling of the sealing material at the inner circumferential edge can be prevented, and effectively preventing the contents from entering between the upper end face of the inlet and the film material.

Implement the invention  Best form for

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described with reference to drawings.

1 is a partially cutaway sectional view of the spout which shows embodiment which applied the sealing structure of the container which concerns on this invention to the spout for pouches. 2 is an enlarged cross-sectional view of the main portion of the portion enclosed by the broken line in FIG.

The spout 1 shown in FIG. 1 has a spout main body 10 having a mold part 11 and a cylindrical spout cylinder 12 extending upward from the mold part 11. The sealing member 13 is heat-sealed at the upper end surface of the opening part of (12). Further, a screw thread 14 for screwing the cap 15 is formed on the outer circumferential surface of the pouring cylinder 12, and the screw thread 14 is provided with a plurality of drainage slits 14a in the circumferential direction.

And the opening part of the pouring container 12 is sealed by the sealing member 13, as shown, and the cap 15 is screwed so that the sealing member 13 may be covered by the pouring container 12. As shown in FIG. Thus, when the cap 15 is attached to the spout 12 by screwing, the resealing treatment by the cap 15 is possible even after opening, but the mounting means of the cap 15 is limited to this. no.

In addition, in the example shown, the mold part 11 with which the spout main body 10 is equipped has the cylindrical part 11a continuous to the ejection cylinder 12, and it is made to be substantially left-right symmetric in this figure from the cylindrical part 11a. Three welding substrates 11b protruding horizontally in a triangular shape and a flange portion 11c positioned at the boundary between the spout cylinder 12 and the cylindrical portion 11a.

The welding substrates 11b are arranged side by side at predetermined intervals along the direction of the central axis of the cylindrical portion 11a, and are connected up and down by column portions 11d positioned at the tip side. Further, the weld substrate 11d is heat sealed to the spout sealing portion 35 of the pouch body 3 as described later, and the flange portion 11c is near the spout sealing portion 35 at this time. It is made to contact with and set the position with respect to the soft foam material which forms the pouch main body 3 (refer FIG. 4).

In this embodiment, the spout main body 10 and the cap 15 can be manufactured by molding means, such as injection molding, using the thermoplastic resin represented by polyolefin resin, such as polypropylene and polyethylene, for example.

Here, although the spout 1 is taken as an example in this embodiment, this invention is applicable also to various containers, such as a bottle-type container.

When the present invention is applied to a bottle-shaped container, the inlet portion of the bottle-shaped container corresponding to the spout body 10 in the above embodiment can be molded into one with the container body, and in addition to the above polyolefin resin, polyethylene terephthalate or polyethylene Various thermoplastic resins, including polyester resins, such as naphthalate, can be used. The bottle-shaped container can be manufactured by direct blow molding, stretched blow molding, or the like. In the case of stretched blow molding, the container inlet can be shaped during preform molding by injection molding or the like prior to blow molding.

Also in any embodiment, a cap and a container inlet part can be suitably manufactured by well-known structure, such as making it blend with said resin or another thermoplastic resin, or making it into a multilayered structure with functional resin, such as an oxygen barrier resin.

In addition, the sealing member 13 which is heat-sealed at the upper end surface of the opening 12 of the spout 12 is made of a substantially circular film material as shown in Fig. 3, and has two projecting pieces (2) at positions facing in the radial direction. 13a) is protruding. This projecting piece 13a is formed as a handle piece for facilitating peeling when the sealing member 13 is opened and peeled off. When the cap 15 is attached to the spout 12, the inner surface of the cap 15 is opened. It is preferable to bend along the shape and to stand up by the elasticity when the cap 15 is removed from the pouring cylinder 12.

3 is a top view which shows the state which heat-sealed the sealing member 13 in the upper end surface of the opening part of the pouring cylinder 12. As shown in FIG.

As a film material used for such a sealing member 13, although the base material layer, an intermediate | middle layer (barrier layer), and a sealant layer are laminated | stacked the film material of the multilayered structure in order through the adhesive bond layer, for example, the specific structure is Required tensile strength, drop impact resistance, pinhole resistance, product resistance, gas barrier resistance, heat resistance when hot sterilization such as hot water sterilization or distillation sterilization is required In consideration of this, it can select appropriately.

As a film material used for the sealing member 13, when using the film material of the said multilayer structure, it is preferable to use the base material film which is excellent in mechanical characteristics, such as tensile strength, impact resistance, and pinhole resistance, for a base material layer. Specifically, the biaxially stretched film which consists of polyester resins, such as a polyethylene terephthalate, polyamide resins, such as nylon, and polyolefin resins, such as a polypropylene, can be used individually or in multiple layers.

Such a base film is, for example, by depositing a metal such as aluminum, an inorganic oxide such as alumina (aluminum oxide) or silica (silicon oxide), or by coating a barrier organic material such as polyvinylidene chloride or polyacrylic acid. In addition, the barrier film may be imparted to the base film itself as necessary by blending an oxygen absorbent resin containing an oxidizing polymer or the like in the base film, an oxygen absorbent made of a reducing metal compound, or the like.

In addition, a synthetic resin film having barrier property to various gases and water vapor can be used for the intermediate layer.

As such a synthetic resin film, for example, an ethylene-vinyl alcohol copolymer film; a vinylidene chloride copolymer film; a crystalline polyamide film (nylon MXD6) obtained from a polycondensation reaction of metha xylenediamine (MXDA) with adipic acid; Ronitrile copolymer films; polyglycolic acid and copolymer films thereof; polyglycolic acid-based films; clay-based nanocomposite synthetic resin films; inorganic film deposition films; barrier organic material coating films such as polyvinylidene chloride and polyacrylic acid; And clay-based nanocomposite material coating films based on thermosetting resins such as phenol resins, epoxy resins, and polyimide resins. In these films, you may blend suitably the oxygen absorbent which consists of an oxygen absorbent resin containing a oxidative polymer, etc., a reducing metal compound, etc. In addition, when transparency is not needed, metal foil (including alloy foil), such as aluminum foil and steel foil, can also be used as another material for providing barrier property.

Further, the sealant layer has heat sealability (at least at a lower temperature than the melting point of the material constituting the base material layer and can be melted, diffused, and solidified), heat seal strength, and heat resistance (heat seal strength at high temperature). , All goods, hygiene, etc. are required.

As the synthetic resin material having heat sealability applicable to such a sealant layer, when the spout 1 is made of polyolefin resin, for example, low density polyethylene, linear low density polyethylene (Ziegler type (multisite catalyst), metalocene type ( Shinglesite catalyst), ethylene-αolefin copolymer, olefin copolymer graft modified with ethylenically unsaturated carboxylic acid or anhydride thereof, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, polybutene-1, polymethyl Ion-crosslinked olefin copolymers (ionomers) in which metal ion groups are introduced into some of pentene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid copolymer, etc., Polyolefin resins such as ethylene-tetracyclododecene copolymer (cyclic olefin copolymer); Aromatic vinyl copolymers such as restyrene and styrene-butadiene copolymers; halogenated vinyl resins such as polyvinyl chloride and polyvinylidene chloride; acrylonitrile such as acrylonitrile-styrene copolymers and acrylonitrile-butadiene-styrene copolymers Copolymers, polylactic acid-based resins (including polymethoractide blending systems), and relatively low melting polyester resins such as polybutylene terephthalate, etc. These resins may be used alone or as necessary. You may mix and use several types.

In addition, when the spout 1 is comprised from polyester resin, as a synthetic resin material used for a sealant layer, polyethylene terephthalate and a polybutylene terephthalate are used as polyhydric carboxylic acid components, such as isophthalic acid and adipic acid, and 1; It is preferable to use the copolyester modified by polyhydric alcohol components, such as a 4-4-butanediol and a 1, 4- cyclohexane dimethanol. And peelability can be provided to a sealant layer by mixing incompatible synthetic resin materials, such as polyethylene and a polypropylene, with respect to such copolyester.

Moreover, as a material which forms the adhesive bond layer which adhere | attaches each of these layers, polyurethane-type resins, such as a polyether-type polyurethane resin and a polyester-type polyurethane resin, polyester resin, an epoxy resin, an acrylic resin, and a polar group were introduce | transduced. Olefin-type resin etc. are mentioned.

In using the film material of such a multilayer structure as the sealing member 13, the synthetic resin film which forms each layer can be obtained by a conventional method, such as the cast method, the T-die method, the calender method, or the inflation method. And such a multilayer film material can be obtained by the conventional method, such as the dry lamination method of the film previously shape | molded, the sandwich lamination method by molten resin, the lamination | stacking coating method, the melt coextrusion method. At this time, in order to improve the adhesiveness of each layer of the base layer, the intermediate layer, and the sealant layer, the surface in contact with the adhesive layer of each layer is corona discharge treatment, flame treatment (flame treatment), ultraviolet treatment, ozone treatment, primer coating treatment (alkyl Surface modification treatment may be performed using a titanate, polyethyleneimine, silane cupping agent, isocyanate compound, polyurethane compound, or the like).

In addition, in the example shown, the cap 15 is equipped with the upper plate 15a which covers the opening part of the pouring cylinder 12, and is provided in the inner peripheral surface of the cylindrical wall 15c which hangs down from the peripheral edge of this upper plate 15a. The screw groove 15b corresponding to the screw thread 14 of the pouring cylinder 12 is formed. Moreover, the annular protrusion 15d which contacts the upper end surface of the opening part of the ejection cylinder 12 through the sealing member 13 is formed in the inner surface of the upper board 15a. 15 d of annular protrusions are formed along the upper end surface of the opening 12 of the injection cylinder 12, and the sealing member 13 is pressed against the upper end surface of the opening 12 of the injection cylinder 12 by this annular protrusion 15d. have.

This effectively prevents the sealing member 13 from peeling off from the upper end surface of the opening 12 of the spout 12 even if the sealing member 13 is lifted upward with an increase in internal pressure during high temperature sterilization or drop impact. It can avoid and can maintain the sealing property of a container (pouch).

Therefore, in this embodiment in which the peeling of the sealing member 13 is prevented by the cap 15 attached to the spout 12, the sealing strength of the sealing member 13 is high temperature sterilization after filling and sealing the contents. It is not necessary to consider the peeling in the distribution process and the like, and it is possible to set appropriately in the range of 5 to 25 N / 15 mm, for example, to give the ease of peeling easily, and in particular, to be 15 N / 15 mm or less, the peelability of the sealing member 13 Can be realized.

In addition, when sterilizing with a sterilizer by high temperature sterilization, the sealing strength is determined to be 23 N / 15 mm or more according to related laws and the like, but the sealing strength of the sealing member 13 can be selected within this range.

In addition, if the sterilizing water used during high temperature sterilization penetrates between the cap 15 and the sealing member 13 and the product is placed in the distribution process while remaining therein, the product may be misunderstood as a defect such as leaking of contents. According to the embodiment, since the annular projection 15d is in contact with the upper end face of the opening of the ejection cylinder 12 through the sealing member 13, the sterilizing water can be prevented from invading to the upper surface of the sealing member 13.

In the illustrated example, the inner surface of the upper plate 15a of the cap 15, together with the annular protrusion 15d described above, has an annular inner circumferential protrusion 15e positioned on the inner circumferential side of the annular protrusion 15d. It is formed in concentric shape with protrusion 15d. The inner circumferential protrusion 15e attaches the cap 15 to the dispensing cylinder 12 such that the tip side of the inner circumferential protrusion 15e contacts the sealing member 13 when the cap 15 is attached to the dispensing cylinder 12. In one state, the tip is formed in the same protruding length as that at the position below the horizontal plane which consists of the upper end surface of the opening part of the pouring container 12 (refer FIG. 2).

In the illustrated example, the tip of the inner circumferential protrusion 15e is positioned below the horizontal plane including the upper end face of the opening of the spout 12, but the tip of the inner circumferential protrusion 15e is at least the spout cylinder ( It is located on the horizontal plane including the upper end surface of the opening 12, and may be in contact with the sealing member (13).

According to this embodiment, when the force which raises the sealing member 13 upwards with the internal pressure rise by forming such inner peripheral protrusion 15e, the inner peripheral protrusion 15e resists this, and the injection cylinder 12 is carried out. The sealing member 13 located in the vicinity of the inner circumferential edge of the opening can be pressed, and the sealing member 13 can be prevented from being peeled off from the upper end face of the opening in the opening circumferential edge of the spout 12.

That is, in this embodiment, while the said ring-shaped protrusion 15d prevents the whole peeling from the upper end surface of the opening part of the sealing member 13, the inner peripheral protrusion 15e is the sealing member 13 in the opening inner peripheral edge. The main purpose is to prevent partial peeling of the layer.

If the position where the inner circumferential protrusion 15e is formed is too far from the inner circumferential edge of the opening, the sealing member 13 located near the inner circumferential edge of the opening 12 of the spout 12 cannot be lifted upward when the pressure increases. As a result, the function of preventing peeling of the sealing member 13 at the inner circumferential edge of the opening 12 of the pouring cylinder 12 is impaired. Therefore, the position at which the inner circumferential projection 15e is formed is a position between the inner circumferential edge of the opening to about half of the opening radius of the spout 12, and the inner circumferential edge of the opening of the spout 12 so as not to be too far from the inner circumferential edge of the opening. It is necessary to form at a position near the inner side.

If any part of the sealing member 13 is peeled off at the inner circumferential edge of the opening 12 of the spout 12, or if there is an unsealed part with the sealing member 13, the contents enter the part and the sealing member 13 ) May cause discomfort to the purchaser when the film is peeled off, but according to the present embodiment, an inner circumferential protrusion 15e in contact with the sealing member 13 is formed on the inner surface of the upper plate 15a provided with the cap 15. The sealing member 13 located on the outer circumferential side of the inner circumferential protrusion 15e is not lifted beyond the upper end surface of the opening 12 of the pouring cylinder 12, whereby the sealing member 13 is the opening of the pouring cylinder 12. Since the state in close contact with the upper end surface can be maintained, the contents can be effectively avoided from entering between the upper end face of the opening 12 of the spout 12 and the sealing member 13.

In the present embodiment, the inner circumferential protrusion 15e is not limited to being formed in a ring shape, and may be formed by aligning and disposing a plurality of small protrusions in a ring shape if the above function is obtained. It can change suitably in the range which is not damaged.

In addition, in the example shown, the predetermined space | gap 2 is formed between the cap 15 and the sealing member 13 in attaching the cap 15 to the pouring cylinder 12. As shown in FIG. As a result, when the internal pressure rises as shown by the dashed two-dotted line in FIG. 2, the sealing site 13 bends upward in the cap 15 to absorb the internal pressure rise during high temperature sterilization or drop impact. As a result, the shock applied to the sealing member 13 when the internal pressure rises is alleviated.

The spout 1 as described above is mounted to the pouch body 3 as shown in FIG. 4 as an outlet for the contents.

In the example shown in figure, the pouch main body 3 is comprised from the trunk | drum 31 and the bottom part 32 formed from soft foam materials, such as a resin film. At the side peripheral edge of the trunk portion 31, the side seal 33 is processed while the bottom portion 32 is folded in the broken line 32a, and a base is provided between the trunk portion 31 and the bottom portion 32. The base seal 34 is processed. Incidentally, the inclined portion 4 which is cut obliquely is formed in the corner portion in the upper left part of the figure, and the welding substrate 11b of the spout 1 in the spout sealing portion 35 of the inclined portion 4 is formed. The whole periphery of the side surface is heat-sealed by the soft foam material which forms the pouch body 3.

Pouches with such spouts are usually conveyed to the filling step of the contents with their apexes being unsealed and subjected to an upper seal 36 treatment on the apexes after the contents are filled. At this time, the spout 1 mounted as the spout 1 has an opening of the spout 12 sealed by the sealing member 13, and the cap 15 covers the sealing member 13 to the spout 12. It is installed. Therefore, even if the sealing strength of the sealing member 13 is easy to peel, the contents can be sealed-sealed with high sealing property. When the contents are poured, the cap 15 is peeled off, and then the sealing member 13 is opened and peeled off, but the sealing member 13 can be heat-sealed at a strength for peeling, and the sealing member 13 can be easily peeled off. can do.

As mentioned above, although preferred embodiment was shown and described about this invention, it cannot be overemphasized that this invention is not limited only to the above-mentioned embodiment, It can variously implement in the range of this invention.

For example, in the above-described embodiment, the inner circumferential side together with the annular projection 15d that contacts the upper end face of the opening of the spout 12 through the sealing member 13 on the inner surface of the upper plate 15a of the cap 15. Although the inner circumferential protrusion 15e is formed in the inner side, the ring-shaped protrusion 15d is required if the inner circumferential protrusion 15e alone can prevent peeling from the upper end surface of the opening of the sealing member 13 and ensures sufficient sealing property. You may omit accordingly.

In addition, in the above-mentioned embodiment, although the example which applied this invention to the spout for pouches was mentioned, the container which can apply this invention is not limited to the pouch as mentioned above. For example, the present invention can also be applied to a squeeze bottle containing mayonnaise and the like, and a photocontainer container containing jam, etc., but the present invention may be subjected to an impact caused by a drop during distribution such as a pouch or squeeze bottle. It is particularly suitable for a container made of a flexible material, in which the container is greatly deformed and the degree of pressure resistance increase is large when the handle is strongly held by the handler.

BRIEF DESCRIPTION OF THE DRAWINGS It is partial cutaway sectional drawing which shows the outline of embodiment which applied the sealing structure of the container which concerns on this invention to the spout for pouches.

FIG. 2 is an enlarged sectional view of the main portion of the embodiment shown in FIG. 1. FIG.

It is a top view which shows the state which heat-sealed the sealing member in the upper end surface of the opening part of a spout.

4 is a front view showing an example of a pouch with a spout.

Explanation of the sign

1 spout 10 spout body

12 Outlet (container inlet) 13 Sealing member

15 caps 15a tops

15d annular turning 15e inner turning

2 voids

As described above, the present invention can be used for various kinds of containers as a sealing structure of the container which seals the container inlet part with a sealing member and also attaches a cap to ensure high sealing property and facilitates the peeling of the sealing member.

Claims (6)

In the sealing structure of the container which seals the inside of a container by heat-sealing a sealing member to the upper end surface of a container inlet part, and attaching a cap to the said inlet part, And an inner circumferential protrusion on the inner surface of the upper plate of the cap, the inner circumferential protrusion of which is located closer to the inner side than the inner circumferential edge of the inlet portion to contact the sealing member. 2. The sealing structure of a container according to claim 1, wherein an inner surface of the upper plate of the cap has an annular protrusion contacting the upper end surface of the inlet portion through the sealing member. The container sealing structure according to any one of claims 1 to 2, wherein the cap is attached to the inlet so that a gap is formed between the cap and the sealing member. The container sealing structure according to any one of claims 1 to 3, wherein the cap is attached to the inlet portion so as to be resealable. A cap mounted to a container inlet sealed with a sealing member, A top plate covering the inlet portion, And an inner circumferential protrusion on the inner surface of the upper plate, the inner circumferential protrusion of which is located closer to the inner side than the inner circumferential edge of the inlet portion and contacting the sealing member when attached to the inlet. 6. The cap as claimed in claim 5, wherein an inner surface of the upper plate has an annular protrusion contacting the upper end surface of the inlet portion through the sealing member.

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