JPS6312427A - Extruded multilayer vessel made of plastic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an extruded multilayer plastic container, and more particularly, to a multilayer container made of extruded plastic, which has an excellent combination of appearance characteristics, prevention of sagging, and extrusion characteristics during use. This invention relates to an extruded plastic multilayer container.

(Prior Art) Plastic containers, due to their roughness and impact resistance,
It has come to be widely used as a container for food and other contents. Containers whose side walls are made of a resin material that can be press-deformed are so-called squeeze-a-pull containers or collapsizol containers, which are filled with mayonnaise, ketchup, various creams, pasty seasonings, and other foods, and the contents are squeezed out through the mouth. It is widely used as

(Problems to be Solved by the Invention) In the extruded container described above, as the content volume decreases as the content is used, the side wall of the container body becomes unsightly crushed, resulting in a poor appearance and When the cap is removed, air is sucked into the container, causing the PiJr Koma suckback phenomenon, and since air and contents coexist in the frozen container, the amount of deformation of the side wall of the container and the extrusion of the contents occur. There is a drawback that there is no correspondence between the amount and the extrusion characteristics.

Therefore, it is an object of the present invention to provide an extruded multilayer plastic container that eliminates the above-mentioned drawbacks of conventional extruded containers and has an excellent combination of appearance characteristics, anti-packing properties, and extrusion characteristics during use.

(Means for Solving the Problems) According to the present invention, an extruded multilayer container having a cylindrical body made of an inner resin layer having a gas barrier resin layer and an outer resin layer and having seamless side surfaces. (1) The outer layer and the inner layer are made to have pressure deformability, and the outer layer has a greater restoring force than the inner layer, and (II) the outer layer is momentarily non-breathable but long-term. (iii) the outer layer and the inner layer are in a non-adhesive state in the container or in a weakly adhesive state so that they can be peeled off;

(Function) In the extruded multilayer container of the present invention, it is essential to make the outer layer and the inner layer a resin material having pressure deformability from the viewpoint of extrudability of the contents. C,
By making the outer layer have a larger restoring force than the inner layer, an effect can be obtained in which the outer layer returns to its original state from the pressed state, but the inner layer is maintained in the suppressed state.

In addition, through (iii) above, the outer layer and the inner layer can be brought into a non-adhesive state or a weakly adhesive state that can be peeled off in the container, so that the outer layer can be returned to its original state (state before compression). The effect is such that the outer layer and the inner layer can be separated so that the inner layer can be maintained in a suppressed state.

Furthermore, by constructing the outer layer with a resin material that is momentarily impermeable but gas permeable in the long term, the boundary between the outer periphery and the inner layer can be penetrated through the outer layer in (11). Air flows in, returning the outer layer to its original state and pressing the inner layer,
That is, the inner layer is kept filled with the contents without any gaps.

In this way, the effects of (1), (11) and (tit) above are combined to ensure that the appearance of the extruded container is always maintained in an unsightly and forceful non-collapsed state, and that it is prevented from being sucked back when the cap is removed. The object of achieving this is that there is no deterioration of the content due to oxygen, and that the amount of content to be extruded can always be controlled in accordance with the degree of pressure applied to the container.

(Preferred Embodiment of the Invention) Container Structure In FIG. 1 showing an example of an extruded multilayer plastic container of the present invention, this container 1 has a body 2 having pressure deformability.
, a content extrusion opening 4 connected to one end of the body via a shoulder 3, and a closed bottom 5 at the other end of the body. A lid fastening screw 6 is provided on the outer periphery of the mouth portion 4, and a sealing lid 7 is hermetically fastened via this screw. In this embodiment, the top surface 8 of the lid 7 is a flat surface extending slightly outward from the fastening portion 9, so that the container can be supported on a table, shelf, etc. in an inverted state. ing. The body part 2 is a cylindrical body with seamless sides, and a closed bottom part 5 at one end is left open before filling with the contents, and after the lid is attached to the container, the contents are removed from this part. After it is filled with material and the air in the head space is pushed out by heart motion, it is sealed using heat sealing or other means. Further, the body portion 2, the shoulder portion 3, and the mouth portion 4 may be integrally formed by blow molding or the like, or
Alternatively, the body portion 2 may be extrusion molded in the shape of a chive, and the shoulder portion 3 and mouth portion 4 may be injection molded, and both may be joined and integrated.

In the present invention, at least the body 2 of the tube container is composed of an inner resin layer having a gas barrier resin layer and an outer resin layer. In the enlarged sectional view of FIG. 2 showing an example of this layer structure, the container body 2 has a resin outer layer 10 and a resin inner layer 1.
1, both of which have deformability under pressure, but the material and layer thickness are selected so that the outer resin layer 1° has a greater restoring force than the inner resin layer 11. Furthermore, although the resin outer layer 10 is momentarily non-breathable,
In the long term, it is constructed from a resin material that is gas permeable. This characteristic will be explained in detail later.

Furthermore, it is also important that the outer resin layer 10 and the inner resin layer 11 be in a non-adhesive state or in a weakly adhesive state that can be peeled off within the container body 2.

In the specific example shown in FIG. 2, the resin inner layer 11 includes a resin inner material layer 12 having excellent moisture resistance, food flavor retention, and hygienic properties on the innermost surface of the container, and a gas barrier resin layer 13 on the outer surface. It is also possible to provide an adhesive resin layer 14 between both layers of the sheet 1 for adhering these two layers.

In Figures 3-A to 3-D for explaining the usage state of the extruded tube container of the present invention, first, the container 1 is filled with the contents 20, and the lid 7 is engaged with the opening 4 and sealed. (Figure 3-A). Next, the lid 7 is removed, the body 2 is compressed and deformed, and a part of the contents 20 is pushed out from the mouth 4, and then the lid 7 is engaged with the mouth 4 and resealed. In this case, the trunk is in a deformed state 2b (Fig. 3-B). In FIG. 3-C showing the state during storage, the resin outer periphery 10 then tries to return to its original state from the state deformed by the original force, and on the other hand, the resin inner layer 11 also tries to return to its original state. Because the inside of the container is under negative pressure, it is kept in a deformed state. Thus, a peeling force acts between the resin outer layer 10 and the resin inner layer 11, and since both layers are in a non-adhesive state or a weakly adhesive state, peeling between the two layers begins. At the same time, since the resin outer layer 10 has gas permeability, air outside the container flows into the gap 21 between the resin outer layer 10 and the resin inner layer 11 through the resin outer layer 10.

Air flowing into the gap 21 is blocked from the contents 20 by a gas barrier resin layer (16 in FIG. 2) in the inner resin layer. In FIG. 3-D showing the steady state, the outer resin layer has completely returned to its original state 10a, while the inner resin layer is maintained in a deformed state 11b, and the gap 21 between both resin layers is is filled with air at approximately atmospheric pressure.

When the lid 7 of the container opening 4 is removed and the body 2 is pressed in the state shown in Fig. 3-D, the pressing force applied to the resin outside 7tlo& is
The air pressure existing in the gap 21 is transmitted to the resin inner layer 11b, and the resin inner layer 11b is suppressed and deformed, causing the extrusion of the contents 20 commensurate with the degree of the pressing force applied to the body 1.

It is clear from the explanation that the outer layer resin used in the present invention is momentarily impermeable but gas permeable in the long term. outer layer 10
The pressing force applied to B is effectively transmitted to the resin inner layer 11b through the air in the gap 21, but in the state shown in Figures 3-B and 3-c, air flows into the gap 21 through the outer layer 10. This means that the process becomes easier over time.

Laminated structure In the present invention, the oxygen barrier resin has an oxygen permeability coefficient (po2) of 5.5 x 10 cc-Crn/d-crnHg (37
℃, 0% RH) or less, particularly 4.5×10 CC-min/- mHg or less, a single thermoplastic resin or a blend of resins can be used.

The most preferred example of such a resin is an ethylene-vinyl alcohol copolymer, especially one having a content of 40 to 85 mol, especially 50 to 80 mol of Nihinyl units. Such ethylene-vinyl alcohol copolymers are made by combining ethylene or a large portion of ethylene with a small amount of other olefins such as propylene, and vinyl esters of lower fatty acids such as vinyl formate, vinyl acetate, and vinyl propionate. The degree of saponification of copolymer, especially ethylene-vinyl acetate copolymer, is 96%.
Above all, by saponifying it so that it becomes 99 chi or more! Ill get it.

Other examples of oxygen barrier resins include nylon resin,
Nylon 6, nylon 8, nylon 11, nylon 12, nylon 6.6, nylon 6.10, nylon 1 in the core
Examples include 0,6, or nylon 6-6.6 copolymers, and polyamides containing para- and/or meta-xylylene diamine components as diamine components.

Since the ethylene-vinyl alcohol combination and the above-mentioned yN ryamide can be blended, and it has a combination of excellent processability and gas barrier properties, it is also possible to use this blend as a gas barrier cloth. It is.

Further, gas barrier resins other than those mentioned above include vinylidene chloride copolymers containing vinylidene chloride units in an amount of 70 to 97% by weight, such as vinylidene chloride-vinyl chloride copolymers, vinylidene chloride-acrylic copolymers, It is also possible to use a high nitrile resin containing acrylonitrile units in an amount of 50 to 97% by weight, such as an acrylonitrile-butadiene copolymer.

As the resin inner layer, the above-mentioned gas barrier resin alone can be used, but in general, the gas barrier resin is sensitive to the presence of moisture, and direct contact between the gas barrier resin and the contents must be avoided. Since it is desirable that
It is desirable to combine the gas barrier resin layer with a layer of thermoplastic resin, especially olefin resin, on the inner surface of the container, which is moisture resistant and has excellent hygienic properties and flavor retention. As the olefin thread polymer, olefin resins such as low-medium density polyethylene or high-density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer, etc. are preferably used.

If there is no interlayer adhesion between the oxygen barrier resin layer and the inner layer such as olefin resin, an adhesive layer is interposed between the two phase resin layers.

As the adhesive resin (C), any resin that exhibits adhesiveness to both the oxygen barrier thermoplastic resin (A) and the moisture-resistant thermoplastic resin described above may be used. Such an adhesive resin (Q generally includes a carbonyl group (-C- ) groups or blends of these polymers with other thermoplastic polymers are used. Although the carbonyl group concentration can vary, it is generally 10 to 1400 mmol/carbonyl group.
100 g polymer, especially 30 to 1200 mmol/1
It is desirable that the adhesive contains a concentration of 0 (1 polymer). Suitable adhesives are those modified with at least one ethylenically unsaturated monomer selected from unsaturated caldic acids, acid anhydrides, esters, amides, etc. Polyolefins, especially maleic acid, acrylic acid, methacrylic acid, crotonic acid, fumaric acid, itaconic acid, maleic anhydride, itaconic anhydride, citraconic anhydride, ethyl acrylate, methyl methacrylate, ethyl maleate, 2-ethylhexyl acrylate ,
Polypropylene modified with acrylic acid amide, methacrylic acid amide, coconut oil fatty acid amide, maleimide, etc., high-density polyethylene, low-density q polyethylene, ethylene-vinyl acetate/L copolymer, etc., and ethylene-acrylate. Copolymers, ionomers (Surlyn A manufactured by DuPont), polyalkylene oxide/polyester block copolymers, carboxymethylcellulose conductors, or blends of these with polyolefins, etc.

As for the resin inner layer, it is preferable that the thickness ratio of the olefin resin inner material and the gas barrier resin is generally in the range of 2=1 to 30:1 and 5:1 to 20:1, and When an adhesive layer is used, the ratio of the thickness of the olefin resin inner material to the adhesive layer is generally in the range of 2:1 to 100:1, particularly 5:1 to 50:1. Also, the thickness of the entire inner layer is 0.0
5 to 0.40 mm, especially 0.08 to 0.30 m
It is better to be in the range of rrt.

As the resin outer layer, one that satisfies the various requirements described above is used. As the resin constituting the outer layer, for example, low-2
medium- or high-density polyethylene, polyzolopylene, ethylene-propylene copolymer, propylene-butene-1 copolymer, propylene-ethylene-butene-1 copolymer,
Among olefin resins such as ethylene-vinyl acetate copolymers, ethylene-acrylate copolymers, ionomers, and polyester resins, those satisfying the above-mentioned requirements are selected and used. The selection criteria will be explained below.

First, in order to select a resin outer layer whose restoring force after compression is larger than that of the inner layer, a resin whose compressive elastic modulus and rigidity are larger than that of the resin inner material of the inner layer is selected. For example, even though they are the same olefin resins, polypropylene and propylene-ethylene copolymers have lower compressive elastic modulus and stiffness than polyethylene. Moreover, even if they are the same polyethylene, high-density polyethylene and medium-density polyethylene are larger than low-density polyethylene and ethylene-vinyl acetate copolymer. Furthermore, when an inorganic filler is blended into the resin, the compressive elastic modulus and rigidity become larger than those without the blend. Furthermore, as the blending ratio increases, these values also increase. Thus, it is also an effective means to incorporate a filler into the outer layer resin. Furthermore, when comparing the same resin, increasing the thickness of the outer resin layer compared to the inner resin layer also helps to increase the recovery force of the outer resin layer after pressure deformation. By employing one or more of the above means, the restoring force of the outer layer can be made stronger than that of the inner layer.

Next, various means are employed to maintain the outer layer and the inner layer in a non-adhesive state within the container. For example, gas barrier resins such as ethylene-vinyl alcohol copolymers and most olefin resins are non-adhesive, so it is better to provide these two phase resin layers adjacent to each other in the container. can be maintained in a non-adhesive state. In addition, when the gas barrier resin layer and the resin outer layer adhere well,
Even when an adhesive layer is interposed between these two phase resin layers, lubricants such as various waxes and fatty acid derivatives may be added to the outer layer resin.
By incorporating various surfactants and transferring these to the adhesive interface, a weakly adhesive state that can be peeled off can be achieved.

The interlayer adhesion between the resin outer layer and the resin inner layer is generally 2017
It is desirable to have a width of 5 g/cm or less, particularly 5 g/cm or less.

Various means are used to make the outer layer momentarily non-breathable but gas permeable in the long term. For example, by using a resin material that itself has high gas permeability, the outer layer having the gas permeability properties described above can be formed. For example, the oxygen permeability coefficient of low density polyethylene is 10
5X10"cc ・cm/cA ・see ・mHg
(37°C, O% RH), which is about 3000 times larger than that of the ethylene-vinyl alcohol copolymer. Thus, a material with high gas permeability, especially an oxygen permeability coefficient (PO2) of 100×1O−11, is used as the outer material.
cc=crn/cfI-cartilage cmHg If a resin material of the above is used, it will be obvious that this material will perform the above-mentioned function as an outer layer. However, in the present invention, it is particularly desirable to use a resin porous body or a foamed body having microscopic pores as the resin outer layer. Such a resin porous body or foam can be obtained by adding a chemical blowing agent or a physical blowing agent to a multilayer resin and then extruding the mixture. However, in the present invention, it is desirable that the outer layer is a low-magnification microfoamed material or porous material described below.

That is, in the most preferred embodiment of the present invention, the resin constituting the outer layer contains an inorganic filler containing separable water of crystallization or adsorbed water. When such an inorganic filler is blended into a resin and melt-molded, at least a portion of crystallized water or adsorbed water is generated as water vapor during the melt-molding process, creating micropores, that is, minute pores in the resin. to come into being. These micropores come to play the role of micro passages for allowing air to pass through the gap between the outer layer and the inner layer after suppressed deformation. It goes without saying that the micropores may be of a communicating type, but they may also be of a non-communicating type (closed cell type). This is because the amount of air permeation through the thinned cells and internal pores is incomparably greater than that of an unfoamed material.

Examples of the non-glossy agent containing crystal water or adsorbed water include inorganic salts containing crystal water, silicate minerals, inorganic oxides and hydroxides containing crystal water or adsorbed water,
Suitable examples thereof include, for example, alkali metal salts such as sodium carbonate, light bread, and sodium sulfate; alkaline earth metal salts such as gypsum, magnesium sulfate, and magnesium carbonate; aluminum salts such as aluminum sulfate; magnesium silicate;
Silicates such as calcium silicate, synthetic aluminum magnesium silicate, zeolite, talc, various clays, diatomaceous earth, etc.; oxides such as magnesium hydroxide, alumina dal, aluminum hydroxide, hydrous amorphous silicic acid, silica-aluminaglue, etc. Hydroxide, etc. These inorganic fillers are
Preferably, the releasable water of crystallization or adsorbed water is contained in the filler a in an amount of 11.5 to 20% by weight, in particular 5 to 11% by weight. Further, the inorganic filler desirably has a particle size of 0.01 to 20 μm, particularly 0.1 to 5 μm, so that it can be easily dispersed in the resin. The amount of crystal water or adsorbed water-containing filler added to the resin can be varied over a wide range depending on the required properties.

Generally, the content of the crystal water or adsorbed water-containing filler in the outer layer resin composition is preferably in the range of 5 to 30 gfi%, particularly 7 to 20 gfi%.

Incorporation of this water of crystallization or adsorbed water-containing filler into the outer layer resin brings about many advantages. One of them is that the pores formed are extremely fine and uniform, and this is because the degree of pores obtained is small and the pores are generated at the interface between the filler solid particles and the resin. The second is that with ordinary foaming agents, the compressive modulus and rigidity decrease significantly as the foaming process occurs, but with this foam, the filling effect of the inorganic filler suppresses the dramatic decrease in these properties. It is to be done. The third reason is that the addition of the filler imparts cine transparency, improves the appearance characteristics, and prevents the contents from being altered by light.

In the present invention, it is desirable to use the above-mentioned inorganic filler containing water of crystallization or adsorbed water in combination with a chemical blowing agent and further with a blowing agent. By using a chemical foaming agent in combination with an inorganic filler, uniform and fine foaming using the inorganic filler as a core is possible, and an outer layer with an excellent combination of 49 properties and gas permeability can be formed. becomes possible.

Examples of chemical blowing agents include azo- and Diazo compounds; benzenesulfonylhydrazide, p-)luenesulfonylhydrazide, diphenylsulfone s, s'disulfonylhydrazide, 4,4'-oxybisbenzenesulfonylhydrazide, etc. sulfonic acid hydrazide compounds; dinitrosopentamethylenetetramine, N
, N'-dimethyl-N, N'-dinitrosoterephthalamide, and other nitroso compounds are used.

The amount of the chemical blowing agent used is not particularly limited, but is suitably in the range of 0.5 to 30% by weight, particularly 1 to 15% by weight, based on the total weight.

The thickness of the resin outer layer varies widely depending on its type, etc.
- Although it cannot be generally specified, generally 100 to 800 μm,
In particular, a range of 200 to 600 μm is preferred, and the thickness ratio of inner layer to outer layer can generally be varied within a range of 1:1 to 1:20, particularly 1:2 to 1:10.

An example of a suitable layer configuration is to indicate the innermost side of the container as the left side, and the peelable interface as double sludge, (1),
Low (high) density polyethylene is LDPE () (DPE),
Ethylene-vinyl acetate copolymer is EVA, polypropylene is PP, propylene-ethylene copolymer is PEC1 filler-containing INF-, ethylene-vinyl alcohol copolymer is EVOH, ion is NY, adhesive The layers, expressed as AD, are as follows, but the invention is of course not limited to these combinations.

LDPE/AD/EVOH/PP.

LDPE/AD/EVOH/PEC.

LDPE/AD/EVOH/HDPE.

EVA/AD/EVOH/LDPE.

LDPE/AD/EVOH/AD/PEC.

LDP E/AD/EVOH/NY/P P.

LDPE/AD/EVOH/INF-LDPE.

LI) PE/AD/EVOH/INF-EVA.

LDPE/AD/EVOH/INF-PEC.

PP/AD/EVOH/INF-PP.

LDPE+AD/EVO)(/IFF-LDPE+AD
0 Container Manufacturing Method The extruded multilayer container of the present invention uses a number of extruders corresponding to the types of constituent resin layers, melts and kneads the corresponding resin in each extruder, and then mixes the various resins into the above-mentioned &layers. It is manufactured by combining the layers in a multi-layer die and extruding them to obtain the following structure. A tube container in which the body, shoulders, and mouth are integrated is produced by blow-molding a parison extruded from a die in a split mold, and cutting the bottom of the formed precursor mold. After the cut end is filled with the contents, it is closed by heat sealing to form the bottom.

In addition, a bottle-shaped extruded multilayer container can be obtained directly by blow molding in a split mold.

The mouth of the container is rigid, and delamination between the outer layer and the inner layer is unlikely to occur, but if necessary, the outer layer resin and the innermost inner layer resin may be heat-sealed to completely prevent delamination. At the same time, the gas barrier resin layer may be prevented from being exposed.

Alternatively, a continuous multi-layer tube is created by extruding or inflating the tube through a multi-layer die, and after cutting this tube to a predetermined size, a mouth part and a mouth part separately manufactured by an injection molding method are attached to one end of the tube. The shoulders can also be fused to form a tube container.

(Operations and Effects of the Invention) According to the present invention, when the outside of the side wall of the container body is stored during use, it is maintained in a good appearance state similar to the swollen state before use, rather than in a crushed state. At the same time, air suction due to suckback is prevented when the cap is removed, and the preservation and aroma retention of the contents are significantly improved.In addition, the content can be quantified according to the amount of deformation of the side wall of the container. The advantage achieved is that consistent extrusion is always possible.

(Example) For the outer layer, melt index (ASTMD-12
38) is 0.5g/10m, density (ASTMD-150
5) Merck (contains 5.3% water of crystallization, average particle size 3.0μ) to polypropylene homopolymer with 0.91.9/CC
, 10wt%, azodical? Amide (specific gravity 1.65
) A 5vt% mixed resin was put into the first extruder (built-in screw with a diameter of 40mm and an effective length of 80mm), and an ethylene-vinyl alcohol copolymer with an ethylene content of 30 mol and a ft of 70% vinyl alcohol was used as the intermediate layer material. The mixture is passed through a second extruder (with a built-in screw of diameter 35 izw and effective length 700 groups), and the melt index is 0.8 as the inner layer material.
11/lQ+m, low density polyethylene with a density of 0.920.9/cc was passed through the fourth extruder (diameter: 40mm, effective length: 800mm).
(with built-in fighting screw) and maleic anhydride-modified polyethylene (modification degree O) as adhesive layer material between the intermediate layer and the inner layer
12%) was extruded through a third extruder (inside a screw with a diameter of 35 m and an effective length of 700 mm) through a die having a multilayer structure to form a molten multilayer (4 types, 4 layers) matrix. This parison was sandwiched between molds cooled to 10° C. and blow-molded at a blow pressure of 6 kg/cd to obtain a multilayer tube container with an inner capacity of 150 cc and a cut-off end at the bottom. The average thickness of the body of the container is 0.4
and the layer composition ratio is outer layer: intermediate layer: adhesive layer: inner layer = 5:
The ratio was 1:0.2:4. Although there was some adhesion between the outer layer and the intermediate layer, the adhesive force was very weak at 3.11//crn width.

The cut bottom of the tube container, shoe cream-1
Fill the bottom with 50g, temperature 220℃, pressure 3.0kl
? /i It was sealed under sealing conditions of 1 hour and 260 seconds.

When the contents of 511 were extruded from this filled tube, deformation was observed in appearance. When observed after 3 hours had passed, there was no air pack, and the condition had been restored to the state before the contents were extruded. 5 more visits or similar
When extrusion was continued at a time of II, each time the extrusion was completed without deformation and without airbags.

(Comparative example) 1. Layer composition ratio: outer layer: intermediate layer: adhesive layer: inner layer = 3:1
:O82:150 in the same manner as in the example except that it was set to 6.
A multilayer chuzo containing 0C was obtained. When shoe cream was filled and sealed in the same manner as in the example, and the contents of 5y were extruded, air bubbles appeared immediately, and when extruded 5I each, air was drawn in and the contents could be extruded smoothly. There wasn't.

2. Melt index 0.819 as outer layer material
A multilayer tube containing 150 pieces was obtained in the same manner as in the example except that low density polyethylene with a density of 0.920Ii/CC and a density of 0.920Ii/CC was used. When shoe cream was filled in the same manner as in the example, the shoe was sealed, and 5 g of the contents were extruded, there was no air bag, but the appearance remained deformed even after one month had passed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a multilayer container according to the present invention, and FIG.
Enlarged sectional views of the body of the multilayer container shown in Figures 3-A to 13
-D is an explanatory view showing the state of use of the multilayer container according to the present invention. DESCRIPTION OF SYMBOLS 1... Multilayer container, 2... Body part, 4... Mouth part, 5...
...Bottom, 7...Lid, 10...Outer layer, 11...Inner layer, 20...Contents. 21... Gap. Figure 1 Figure 3-A Figure 3-8 Figure 3-C Figure 3-D

Claims (1)

[Claims] (1) In an extruded multilayer container having a cylindrical body with seamless side surfaces and consisting of an inner resin layer with a gas barrier resin layer and an outer resin layer, the outer layer and the inner layer have pressure deformability, and the outer layer has a greater restoring force than the inner layer, the outer layer is made of a resin material that is momentarily impermeable but gas permeable in the long term, and the outer layer and inner layer are non-adherent in the container. 1. An extruded multilayer container characterized in that it is in a state or in a peelably weakly adhesive state.