JPH01167074A - Hermetically-sealed and easily-openable container - Google Patents

Abstract

PURPOSE:To supply a strong sealing force withstanding pressure of an unsealing force from a container inside but to easily open the container from one end of a cap by fingers, by heat-sealing the cap, provided with a laminated member having a heat-sealing performance on the inside of a rigid crust at the opening of the container. CONSTITUTION:A cap (c) has a rigid crust 8, and a laminated member 7 attached to the inner face of a top plate 9 of the crust 8 is provided with not only an inner face member 16 for heat-sealing and a blend weakening layer 15 but also a basic resin film member 14, a basic metal foil 13 and an adhesive resin layer 12. The thickness of respective layers is specified as the basic resin film member 14 >= the blend layer 15 > the heat-sealing layer 16. A coating layer 6 on an opening 5 and the laminated member 7 are heat-sealed through the heat-sealing layer 16 along the all fitting area. In such a way, a large sealing force can be obtained against an unsealing force from the inside of the container. On the other hand, when the cap is pulled up with fingers applied to the flange 11, the cap can be easily, removed from the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an easily openable sealed container, and more specifically, the present invention relates to an easily openable sealed container, and more specifically, the container has a significantly high pressure-resistant sealing force against opening from the inside of the container. At the same time, when opening the cap from one end, it is easy to open with finger force, and resealing is difficult. The present invention relates to a sealed container having:

(Prior Art) Conventionally, it is known that a peelable lid (easy-open M) is heat-sealed to the mouth of the container, which is called an easy-open container. This container has a protective resin coating on the outer surface of metal foil such as aluminum foil, and a heat-sealable resin inner material on the inner surface, and the seal strength between the container opening and the lid is determined by a method called peelable adhesion. It is adjusted to a width of 0.05 to 2 kg/mm.

(Problems to be Solved by the Invention) However, the above-mentioned peelable lid is functionally flexible, and the mechanical strength of the lid material itself is insufficient, and it is difficult to protect it from external destructive forces. Then, there is the trouble of having to put on the outer lid separately.

In addition, the seal strength between the container opening and the lid changes depending on the heat sealing temperature, and when heat sterilizing the contents, the seal strength also changes due to the heat sterilization. There is a problem in that it is difficult to obtain something like the power of the bottle.

Among special heat-sealed packages, those whose contents have been retort sterilized are required to have a sealing strength (peel strength) of 2.3 kg and a width of 715 mm or more from the inside. Lids of the type that are opened by breaking the heat-sealed portion have not yet been put to practical use.

Therefore, a cap that has a rigid outer shell, can be sealed tightly by heat sealing, and can be easily opened with a finger is highly desired in the art.

Therefore, it is an object of the present invention to prevent opening from the inside of the container when opening a sealed container whose mouth is heat-sealed with a cap having a heat-sealable laminate on the inner surface of a rigid outer shell. In addition to having a significantly high pressure-resistant sealing force, the cap can be easily opened using finger force from one end of the cap, and since it is difficult to reseal, a heat-seal cap is used that also has the function of guaranteeing the quality of the contents. It is on offer.

(Means for Solving the Problems) According to the present invention, the top plate part integrally formed of a rigid material, the peripheral part, and an opening flange or tab provided on at least a part of the peripheral part are provided. an outer shell; a heat-sealable resin inner surface material located on the container side joined to the inner surface side of the top plate of the outer shell; a base material located on the shell side; and the heat-sealable resin and others located between the two. an inner laminate having a weakened layer made of a blend of resin with a resin; Provided is an easily openable sealed container characterized by being sealed by heat sealing.

(Function) In FIG. 1 showing an example of the easily openable sealed container of the present invention, container B has a cylindrical body 1, a bottom 2 at the lower end, a shoulder 3 at the upper end, and a neck 4. . The upper open end of the neck 4 forms a sealing mouth 5, and heat sealing is performed between the coating layer 6 coated on the mouth 5 and the laminate 7 of the cap C covered thereon. The container is then sealed.

In FIGS. 2 and 3, which show enlarged cross-sectional structures of the heat-sealing portion of this container, the laminate 7 of the cap C and the coating layer 6 are bonded together over the entire surface of their engagement, with a heat-sealing layer 16 interposed therebetween. The sheet is sealed.

The cap C has a rigid shell 8, which includes a top plate 9, a peripheral part 1o, and an opening flange or tab 11 provided on at least a part of the peripheral part.
(Figure 1 is an example of a flange). Shell body 8
A laminate 7 is bonded to the inner surface of the top plate portion 9 .

The laminate 7 has a heat-sealable resin inner material 16 on the container side,
and a weakened layer 15 made of a blend of the heat-sealable resin and another resin, which is a lower layer of the heat-sealable resin inner material. In the specific example shown in FIG. 2, the inner side laminate 6 includes a base resin film layer 1 in addition to the above-mentioned inner surface material 16 for heat sealing and blend weakening layer 15.
4. It also includes a base metal foil 13 and an adhesive resin layer 12. The inner side laminate 7 is attached to the outer shell 8 via the adhesive resin layer 12.
The top plate is joined to the inner surface.

The thickness of each layer is preferably in the following order: base resin film layer 14≧blend layer 15>heat seal layer 16.

The reason why the blend layer 15 is provided is that this portion has a structure weakened by the blend, so that cohesive failure selectively occurs in this portion.

The reason why the heat seal layer 16 is provided on the blend layer 15 is to obtain a large heat seal strength at the heat seal interface with the mouth of the container. Moreover, since the thickness of the heat seal layer 16 is made thinner than that of the blend layer 15, the heat seal layer 16 is easily broken in response to a peeling force (moment) from one end of the cap.

The laminate 7 is attached to the cap C (
7) It is joined to the inner surface side of the top plate part 9 of the shell body 8, and is joined to the mouth part 5 of the container B via the heat seal layer 16.

By providing a coating layer 6 on the container opening 5 that has heat-sealing properties for the heat-sealing resin inner material 16 provided on the cap, it is possible to apply the coating layer 6 to the container made of a rigid material such as metal or glass. can also be heat sealed. From the viewpoint of easy opening, the coating layer 6 is preferably provided on the outer circumferential side of the mouth of the container.

When opening the sealed container of the present invention, an extremely large opening force of 10 kg or more is required to pull the cap uniformly over the entire circumference and open the cap. In this way, an extremely high pressure-resistant sealing force can be obtained against opening from the inside of the container.

On the other hand, as shown in FIGS. 4 and 5 (enlarged views), when you place your finger on the opening flange 11 of the cap and push the cap upward, the heat seal layer 16 on the opening side first The fracture occurs from the container side to the shell side, then cohesive failure of the blend layer 15 occurs, and finally, the heat seal layer 16 fractures again from the shell side to the container side, causing the cap and the mouth of the container to break. A separation occurs. Since the shell 8 of the cap is made of a rigid material, the heat-sealed portion is destroyed all at once over the entire circumference of the mouth portion 5. Further, since the heat-sealed portion is destroyed in the above-described order, an advantage is achieved in that the cap can be opened easily with fingers.

Furthermore, the inner diameter of the peripheral portion 10 of the shell 8 of the cap C is manufactured to be larger than the outer diameter of the container opening.
Because it is not possible to seal the bottle after opening, the fact that the bottle has been opened becomes obvious, so a function to guarantee whether the contents have been touched or not is provided.

(Preferred Embodiment of the Invention) In the present invention, the outer shell 8 of the cap can be made of any material such as synthetic resin, ceramic, metal, etc. as long as it is made of a rigid material. Here, the rigidity of the cap refers to a property that allows the cap to be lifted suddenly without bending when opened.

In terms of heat-sealability, the cap shell is made of olefin resins such as tactical polypropylene, high-density polyethylene, propylene-ethylene copolymer, poly-4-methylpentene-1; styrene-butadiene copolymer; Styrenic resins such as ABS resin and polystyrene;
It is preferably made of nylon resin; saturated polyester resin; polyarylate resin; polycarbonate resin; hard vinyl chloride resin, etc. Furthermore, it is even more effective to mix an appropriate amount of inorganic filler (charcoal, talc, various ceramics, mica, etc.). The cap outer shell can be manufactured by injection molding or press molding. The thickness of the top plate is generally 0.
The diameter is preferably in the range of 5 to 3.0 mm, and the diameter is 10 mm.
A range of 200 mm to 200 mm is desirable from the viewpoint of ease of opening. Further, the height of the peripheral part of the cap outer shell varies depending on the diameter of the top plate, but is 0.1 to 0.3 of the diameter of the top plate.
It is desirable to have double the height.

Of course, it should be understood that there is no problem in forming the cap outer shell from aluminum, tinplate, electrolytic chromic acid treated steel plate, or the like.

Heat-sealable resin The heat-sealable resin inner material 16 of the inner-face material laminate 7 is made of a heat-sealable material known in Kochi, for example, low-1 medium- or high-density polyethylene, polypropylene, propylene-ethylene copolymer, acid Modified olefin resin, EVA
olefin resin heat sealants such as; polyester or copolyester heat sealants; polyamide or copolyamide heat sealants; and polyvinyl acetal resins.

When the container opening to be heat-sealed is made of resin, it is preferable to use the same kind of heat-sealing resin as the inner material 7 for the heat-sealing inner material. However, acid-modified olefin resin or polyamide-based Heat sealants can form a strong heat seal with metal, and polyvinyl acetal resin can form a strong heat seal with glass. In order for the heat-sealed inner material to be opened by the above-mentioned mechanism, it should have a thickness as thin as possible, and preferably has a thickness of generally 2 to 3 μm, particularly 5 to 10 μm.

A resin film, a metal foil, or a combination thereof is used as the base material of the E-M laminate. - Generally, the base material consists of a resin film intermediate layer 14, a metal foil 13 and an adhesive resin layer 12, as shown in FIG. The resin film intermediate layer adheres the weakened layer made of the blend and facilitates the tearing of the inner material layer from the shell side to the container side when the package is opened, and the weakened layer does not adhere well to the base material. Then, after opening the container, the inner surface material layer remains in the form of a film at the mouth of the container. As the resin film intermediate layer, those exemplified above as heat-sealable resins can be used.

Its thickness is generally 20 to 80 μm, especially 30 to 60 μm.
It is desirable to be in the μm range.

The metal foil acts as a heating element when high-frequency induction is heated during heat sealing, and also provides the cap with barrier properties against gases, scents, and the like. As metal foil,
Aluminum foil, steel plate, iron foil, tin foil, etc. are used, and the thickness is preferably in the range of 5 to 50 μm, particularly 10 to 30 μm.

The adhesive resin to the shell is used to bond the laminate to the shell. In the case of thermal bonding, the heat-sealable resins listed above can be used, as well as urethane adhesives. , epoxy adhesive, etc. can also be used.

Note that, of course, when heat sealing is performed by ultrasonic heat sealing or spin welding, the metal foil can be removed from the base material. In this case, it is possible that the use of adhesive resin for the shell can be omitted.

The weakening layer 15 used in the present invention is provided as an intervening layer between the heat-sealable inner material layer and the base material, and is a layer between the heat-sealable resin of the inner material layer and another resin. Consists of a blend. By using such a blend, the resin layer itself is weakened compared to when using a single resin,
Cohesive failure easily occurs during peeling.

Resin (
B) is preferably a resin constituting the intermediate layer of the resin film, and the blend ratio of both A:B is preferably 20:80 to 60:40, particularly 30:70 to 45:55. Also, resin (^) and resin (B) are
It is preferable that the resins are of the same type but different; therefore, combinations of propylene-ethylene copolymer and polypropylene; combinations of low-density polyethylene and high-density polyethylene; combinations of acid-modified polyethylene and unmodified polyethylene; etc.

The thickness of the blend physics is generally 5 to 40 μm.

In particular, it is preferably within the range of 10 to 20 μm.

In addition, base film (C+): blend weakened layer (C
2) The thickness ratio of the heat seal inner layer Ccs) is approximately (
A ratio of 2-10):(3-1):1 gives the most desirable results. Also, the seal strength (P) of each layer
is the formula % formula % (1) In the formula, P C1-C2 represents the sealing strength between the C1 and C2 layers, and the same applies below, and P C3-6 is the sealing strength between Cs/if and the container mouth (B). It is desirable that the strength (T) of each layer satisfies the following formula (4).

To seal the container with a cap, use the laminated body as a disk.
This is done by punching out a shape, fitting it into the outer shell of the cap, placing this assembly over the mouth of the container, and applying high-frequency induction heating while pressing it against the mouth of the container with a constant pressing force. Generally, the appropriate pressing force is in the range of 0.5 to 2 g, and the heat sealing is performed at a temperature higher than the melting point or softening point of the resin.

still. In FIG. 2, small protrusions 17 provided on the inner periphery of the cap shell prevent the laminate from coming off.

Twenty two! The coating layer used in the present invention exhibits adhesion to a glass or metal container, and also exhibits heat sealability to the heat sealable resin inner material of the laminate on the inner surface of the cap.

The specific chemical composition of the coating layer varies depending on the type of the inner surface material, but for example, when the inner surface material is an olefin resin, an acid-modified olefin resin, an epoxy-modified olefin resin, or an oxidized polyethylene resin is used. These modified olefin resins exhibit excellent adhesion to glass containers or metal containers due to the presence of the above-mentioned functional groups, and since they are mainly composed of olefin resin, they also exhibit excellent adhesion to olefin resin inner materials. It exhibits excellent heat sealability.

Examples of acid-modified olefin resins include low-medium density polyethylene or high-density polyethylene, crystalline polypropylene, crystalline polybutene-1, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, etc. The skeleton is an olefin resin of acid,
Those grafted with ethylenically unsaturated carboxylic anhydrides such as citraconic anhydride, 5-norbornene-2,3-dicarboxylic anhydride, and tetrahydrophthalic anhydride are used. The acid or acid anhydride is preferably present in an amount of 1 to 500 mmol, especially 10 to 300 mmol per 100 g of resin. The olefin units in the acid-modified olefin resin are desirably the same as the olefin units in the olefin resin inner material. For example, when the inner material is polypropylene, it is preferable to use acid-modified polypropylene.

The epoxy-modified olefin resin used is one in which an ethylenically unsaturated epoxy compound is grafted onto the above-mentioned olefin resin, and the concentration of epoxy groups is 10
1 to 500 mmol, especially 10 to 300 mmol per 0 g
Monomers used to introduce the epoxy group, which may be in the millimolar range, include glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, butadiene monoxide, vinylcyclohexene monoxide, and the like.

Examples of oxidized polyethylene include those obtained by oxidizing polyethylene in the form of a molten phase or a dispersed phase, and the oxygen content in the resin is 1 to 20% by weight, particularly 5 to 10% by weight.
are used.

These modified olefin resins are applied to the mouth of a container either alone or diluted with an unmodified olefin resin, and in the form of a powder, suspension, film, melt, or the like. To coat the container, a roller coating method, a spray coating method, a thermal spraying method, a fluidized dipping method, an electrostatic coating method, etc. are employed. The thickness of the coating layer is suitably in the range of generally 1 to 20 .mu.m, particularly 5 to 15 .mu.m.

Further, the above-mentioned modified olefin resin can also be dispersed in a coating film-forming resin and applied in this state to glass containers and metal containers to form a heat-sealable coating. Examples of resins for forming coating films include phenol/formaldehyde resin, urea/formaldehyde resin, melamine/formaldehyde resin, xylene/polmaldehyde resin, epoxy resin, alkyd resin, polyester resin, thermosetting acrylic resin, and urethane resin alone. Or a thermosetting resin consisting of a combination of two or more types: or acrylic resin, vinyl resin such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate maleic acid copolymer, vinyl butyral resin, styrene-butadiene - Thermoplastic resins such as acrylic ester copolymers and polyamide resins can be mentioned.

In addition, when the heat-sealable inner material is vinyl chloride resin, acrylic resin can be used as it can be heat-sealed with vinyl chloride resin and has excellent adhesion to glass or metal. . As the acrylic resin, at least one (meth)acrylic ester
A resin containing a seed as a main component and a small amount of an ethylenically unsaturated carboxylic acid or its anhydride as a comonomer is preferably used,
For example, those having an acid value in the range of 1 to 20, particularly 5 to 15 are suitable.

Of course, the coating layer is not limited to those mentioned above, but in the case of a copolyamide-based or copolyester-based heat seal inner surface material, a copolyamide-based or copolyester-based coating agent may be used.

Of course, the thickness of the coating layer and the coating method may be the same as those described above.

When a glass container is used as the container used in the present invention, it has the advantage of being excellent in corrosion resistance and transparency, but on the other hand, it has poor heat-sealability and is particularly heat resistant. It has the disadvantage that it is difficult to form a water-based heat seal seal.

The exact reason for this is unknown, but according to the research of the present inventors, the glass surface is highly hydrophilic and has inherently poor thermal adhesion with resins, and that Even if thermal bonding is performed, when water acts on this bonding interface, the glass surface adsorbs water and adhesive failure progresses, which is thought to be the cause.

Therefore, in the present invention, by performing heat sealing with a glass brimer layer interposed on the glass surface side, not only can the heat sealing operation be performed extremely easily and reliably, but also the lid body and the glass A strong heat seal with a heat seal strength of 2.3 and a width of more than 5 am can be introduced between the end of the container, and this heat seal part can withstand not only ordinary water but also heat. It was discovered that almost no adhesive deterioration occurs even when exposed to water or hot steam.

The glass brimer used in the present invention is useful for forming bonding points on the glass surface during heat sealing, and also prevents the formation of a water adsorption layer when water acts on the adhesive interface. It has the effect of preventing.

As the glass brimer, any one can be used as long as it has the above-mentioned effect, but silane coupling agents, particularly aminosilane coupling agents, are particularly suitable for the purpose of the present invention. be able to. Suitable examples thereof include, but are not limited to:

Silane coupling agent γ-aminopropyltriethoxysilane, N-β(aminoethyl)γ-aminopropyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-β(aminoethyl)γ-amino Amino-based silanes such as propylmethyldimethoxysilane.

γ-methacryloxypropyltrimethoxysilane, Methacryloxy silanes such as.

Vinyl silanes such as vinyltris(β-methoxyethoxy)silane, vinyltriethoxysilane, vinyltriethoxysilane, vinyltrichlorosilane, etc.

Epoxy-based silanes such as β-(3,4 epoxycyclohexyl)ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyljethoxysilane, and the like.

Mercapto-based silanes such as γ-mercaptopropyltrimethoxysilane.

Chloropropyl silane such as γ-chloropropyltrimethoxysilane.

Furthermore, in addition to the silane coupling agent, chromium-based, titanate-based, inorganic-based, etc., can also be used as the glass brimer, and suitable examples thereof are as follows.

Titanate coupling agents Isopropyl triisostearoyl titanate, Isopropyl tridodecylbenzenesulfonyl titanate, Isopropyl tris (dioctyl pyrophosphate)
Titanate, Tetraoctylbis(ditridecylphosphite) titanate, Tetra(2,2-diallyloxymethyl-1-butyl)
, bis(di-tridecyl) phosphite titanate, bis(dioctyl pyrophosphate) oxyacetate titanate, bis(dioctyl pyrophosphate) ethylene titanate, isobrobyl trioctaynor titanate, isopropyl dimethacrylic isostearoyl titanate, isopropyl isostearoyl diacryl titanate , Isopropyl tri(dioctyl phosphate) titanate, Isopropyl tricumylphenyl titanate, Isopropyl tri(N-aminoethyl-aminoethyl) titanate, Dicumylphenyloxyacetitanate-diisostearoylethylene titanate, Polydiisopropyl titanate, Tetra-n-butyl titanate , polydi-n-butyl titanate, inorganic brimer tin oxide, titanium oxide, indium oxide/tin oxide, chromium oxide/cobalt oxide, etc.

The coating layer is provided on the opening to be heat-sealed to the cap, either directly or via the brimer layer. The thickness of the coating layer is not particularly limited, but it is generally in the range of 0.5 to 500 μm, particularly 1 to 50 μm. The coating width is generally in the range of 0.5 to 5 mm, particularly 1 to 3 mm, and from the viewpoint of easy opening, the outer diameter of the heat-sealed portion between the cap and the container is in the range of 5 to 50 mm.
Ilφ, particularly preferably in the range of 10 to 20 mmφ. Heat sealing is preferably performed by high frequency induction heating.

(Effects of the Invention) The container according to the present invention has a rigid outer shell and a cap that has a heat sealing function that is tightly attached to the inside of the outer shell, and has a heat sealing property at the mouth of the container against the heat sealing surface of the cap. The container is heat-sealed with a coating layer having a coating layer that has a significantly high pressure-resistant sealing force against opening from the inside of the container, and can be easily opened with finger force from one end of the cap. Moreover, since it is difficult to reseal, it also has the advantage of having a quality assurance function for the contents.

This container is a soft drink container, an alcoholic beverage container,
It is useful as a simple, easy-to-open sealed container for milk beverage containers, fruit-filled containers, infusion containers, etc.

(Example) 922ヱΩl] Inner diameter 27mmφ injection molded by injection molding method
, homopolypropylene (d = 0.90%
M I-6) 20 μm thick film on 35 μm thick film
Homopolypropylene (d = 0.90. M I =
4) 20 μm thick, weakened layer with a thickness of 10 μm made by blending homopolypropylene and copolypropylene at a ratio of 60:40 as an intermediate layer, and heat sealing with a thickness of 5 μm of copolypropylene (d-0,90% MI-2,5) as an inner layer. A laminated film obtained by laminating three coextruded films was punched out to a diameter of 27 mm and mounted.

Bottle height 140mm, mouth outer diameter 25mmφ, internal volume 120m1
A 2% solution of γ-aminopropyltriethoxysilane in water, water, and ethanol was applied to the lip of a glass bottle and dried.

Next, maleic anhydride-modified polypropylene (
Average carbonyl group concentration: 12o mmol/100g resin, melting point: 157°C, MI: 120g/10+s
fn ) suspension (toluene) was applied and dried to provide a circumferential coating layer approximately 3 μm thick and approximately 211III+ wide.

Heat-sealing The cap was placed over the mouth of the coated bottle, and a transistor inverter (high-frequency induction heating machine) manufactured by Shimada Rika Kogyo was used to heat the bottle at a current value of 4 A, heating time of 1.1 seconds, and cooling time of 1.
The cap and the laminated film were fused together and the bottle opening and the laminated film were heat-sealed at the same time under conditions of 0 seconds and a pressure of 1.0 kg.

In order to check the opening force of the heat-sealed cap, the tensile strength (opening force) was measured using a Tensilon tensile tester.

(a) When a tensile force was applied uniformly to the entire circumference of the cap, the cap could be opened at 20.3 g.

(b) When only the tab was pulled up, the opening force was approximately 1.5
It was g.

[Brief explanation of the drawing]

FIG. 1 shows an example of the easy-to-open sealed container of the present invention, FIG. 2 shows an enlarged sectional view of the heat-sealed portion of the easy-to-open sealed container of the present invention, and FIG. FIG. 4 is an enlarged sectional view of the heat-sealed part with the cap opened, and FIG. 5 is an enlarged view of the main part of FIG. 4. 5... Container opening, 6... Coating layer, 7...
Laminated body, 8... Shell body, 12... Adhesive resin layer, 13
...Base metal foil, 14...Base resin film layer, 1
5... Blend weakening layer, 16... Inner surface material for heat sealing. Figure 1 Figure 2: Figure $3

Claims (6)

[Claims] (1) An outer shell integrally formed of a rigid material, including a top plate portion, a peripheral portion, and an opening flange or tab provided on at least a portion of the peripheral portion; joined to the inner surface of the top plate portion of the outer shell; a heat-sealable resin inner material located on the side of the container, a base material located on the shell side, and a weakened layer made of a blend of the heat-sealable resin and another resin located between the two. Inner side laminate;
and a container whose heat-sealing surface is provided with a coating layer that has heat-sealing properties for the heat-sealable resin inner material, and the container is sealed by heat-sealing. container. (2) The inner side laminate consists of a laminate of an olefin resin inner material, a blended resin weakening layer, an olefin resin intermediate layer, a metal foil, and an olefin resin layer, and the coating layer is an acid-modified olefin resin, an epoxy-modified olefin resin, or an oxidized The container according to claim 1, which is a coating layer containing polyethylene. (3) The container according to claim 2, comprising a laminate in which the thickness of each layer is in the order of intermediate layer≧blend layer≧heat seal layer. (4) The inner side laminate consists of a laminate of a vinyl chloride resin inner material, a blended resin weakening layer, a vinyl chloride resin intermediate layer, a metal foil, and a vinyl chloride resin layer, and the coating layer contains an acrylic resin. 2. The container according to claim 1, wherein the container is a coating layer of: (5) Heat-sealable resin inner material breaks easily 2 to 3
The container according to claim 1, having a thickness of 0 μm. (6) The container according to claim 1, wherein the outer diameter of the heat-sealed portion between the cap and the container is 5 to 50 mmφ, particularly 10 to 20 mmφ.