CN203093237U - Flexible package - Google Patents

Abstract

The utility model provides a flexible package and in particular discloses a flexible package with excellent gas barrier property, incense retaining property, oil resistance, organic solvent resistance and transparency. At least one part of the flexible package is provided with a multi-layer structure body; and an intermediate layer of the multi-layer structure body is an ethylene-vinyl alcohol copolymer and polyamide mixing layer (3). The flexible package is excellent in gas barrier property, incense retaining property, oil resistance, organic solvent resistance and transparency and is most suitable for packaging of foods.

Description

Flexible package

Technical field

The utility model relates to a kind of flexible package, relates in particular to a kind of gas barrier property barrier of gas such as oxygen, carbon dioxide gas and odour component (promptly for), fragrance protectiveness, oil resistivity, organic solvent resistance, flexible package that the transparency is excellent.

Background technology

For the packaging material that are used for packaged food and various article, require gas barrier property more, particularly hinder oxygen.This is to cause deterioration packing content things such as oxidation in order to prevent because of a large amount of infiltrations of oxygen.For this reason, in packaging material in the past, be provided for preventing that the gas barrier layer that sees through of oxygen from stoping, delaying seeing through of oxygen.

Thermoplastic resin as packaging material, for example polyolefin (as polyethylene and polypropylene), polyester (as PET) and fatty polyamide (as nylon 6), because have higher transparency and excellent mechanical performance and the characteristic of processing processing easily, thereby being processed to comprise the bag film, containers such as sheet material and bottle are at interior various goods.Yet, because these thermoplastic resins are very poor to the barrier of all gases material such as oxygen, so packing material wherein is easy to owing to oxidation is gone bad.Ethylene-vinyl alcohol copolymer (EVOH) is the macromolecular material that has performances such as excellent gas barrier property, fragrance protectiveness, oil resistivity, non-charging property, mechanical strength.Under the environment of low relative humidity, has good gas-barrier properties as packaging material with it, if very high water activity packing material is stored under high humidity environment or object will pass through high temperature sterilization after packing if but if the storage thing has, gas barrier properties etc. will reduce greatly, cause the stored condition variation.

The utility model content

The utility model proposes in order to address the above problem, and its purpose is to provide the flexible package of a kind of gas barrier property, oil resistivity, organic solvent resistance, transparency excellence.

For realizing this purpose, flexible package of the present utility model, at least a portion is a multilayer structure making, the intermediate layer of described multilayer structure making is ethylene-vinyl alcohol copolymer and polyamide mixed layer (EVOH+PA layer) 3.

Here preferably, this multilayer structure making is five layers, comprises one deck polyolefin layer (PO layer) 1, two-layer aramid layer (PA layer) 2, one deck adhering resin layer 4 and one deck EVOH+PA layer 3.

Further, this multilayer structure making is seven layers, comprises one deck PO layer 1, three layers of PA layer 2, two-layer bonded resin bed 4 and one deck EVOH+PA layer 3.

Further, this multilayer structure making is seven layers, comprises two-layer PO layer 1, two-layer PA layer 2, two-layer bonded resin bed 4 and one deck EVOH+PA layer 3.

Further, this multilayer structure making is nine layers, comprises two-layer PO layer 1, three layers of PA layer 2, three layers of adhering resin layer 4 and one deck EVOH+PA layer 3.

Further, the inboard PA layer 2a of described two-layer PA layer 2 for being positioned at the outermost outermost layer PA layer 2b of described multilayer structure making and being positioned at described EVOH+PA layer 3 inboard, described one deck PO layer 1 is the innermost layer PO layer 1a that is positioned at the innermost layer of described multilayer structure making, disposes described one deck adhering resin layer 4 between described inboard PA layer 2a and the described innermost layer PO layer 1a.

Further, described three layers of PA layer 2 are for being positioned at the outside P A layer 2c in the outermost outermost layer PA layer 2b of described multilayer structure making, the inboard PA layer 2a that is positioned at described EVOH+PA layer 3 inboard and described EVOH+PA layer 3 outside, described one deck PO layer 1 is the innermost layer PO layer 1a that is positioned at the innermost layer of described multilayer structure making, dispose one deck adhering resin layer 4b between described outermost layer PA layer 2b and the described outside P A layer 2c, dispose another layer adhering resin layer 4a between described inboard PA layer 2a and the described innermost layer PO layer 1a.

Further, described two-layer PA layer 2 is for being positioned at the inboard PA layer 2a of described EVOH+PA layer 3 inboard and the outside P A layer 2c in described EVOH+PA layer 3 outside, and described two-layer PO layer 1 is the innermost layer PO layer 1a of the innermost layer that is positioned at described multilayer structure making and the outermost outermost layer PO layer 1b that is positioned at described multilayer structure making.Dispose one deck adhering resin layer 4b between described outermost layer PO layer 1b and the described outside P A layer 2c, dispose another layer adhering resin layer 4a between described inboard PA layer 2a and the described innermost layer PO layer 1a.

Further, described three layers of PA layer 2 are for being positioned at the outermost outermost layer PA layer 2b of described multilayer structure making, be positioned at the inboard PA layer 2a of described EVOH+PA layer 3 inboard and the outside P A layer 2c in described EVOH+PA layer 3 outside, described two-layer PO layer 1 is the innermost layer PO layer 1a of the innermost layer that is positioned at described multilayer structure making and the outside P O layer 1c that is positioned at the described outside P A layer 2c outside, dispose one deck adhering resin layer 4a between described inboard PA layer 2a and the described innermost layer PO layer 1a, dispose another layer adhering resin layer 4b between described outermost layer PA layer 2b and the described outside P O layer 1c, dispose another layer adhering resin layer 4c between described outside P A layer 2c and the described outside P O layer 1c.

Wherein, the thickness of described EVOH+PA layer 3 is 1-30 μ m, and the thickness of described adhering resin layer 4 is 1-20 μ m, and the thickness of described PA layer 2 is 1-30 μ m, and the thickness of described innermost layer PO layer 1a is 10-150 μ m.

Wherein, the thickness of described EVOH+PA layer 3 is 1-30 μ m, and the thickness of described adhering resin layer 4 is 1-20 μ m, and the thickness of described PA layer 2 is 1-30 μ m, and the thickness of described innermost layer PO layer 1a is 10-150 μ m, and the thickness of described outermost layer PO layer 1b is 5-50 μ m.

Wherein, the thickness of described EVOH+PA layer 3 is 1-30 μ m, and the thickness of described adhering resin layer 4 is 1-20 μ m, and the thickness of described PA layer 2 is 1-30 μ m, and the thickness of described innermost layer PO layer 1a is 10-150 μ m, and the thickness of described outside P O layer 1c is 5-50 μ m.

Flexible package gas barrier property of the present utility model, fragrance protectiveness, oil resistivity, organic solvent resistance excellence, optimum is used for splendid attire food.

Description of drawings

Fig. 1 is the example of the utility model during as sack.

Fig. 2 is the cross-sectional view of the flexible package of Fig. 1 along A-A.

Fig. 3 is the cross-sectional view of the flexible package of an example of the utility model.

Fig. 4 is the cross-sectional view of the flexible package of another example of the utility model.

Fig. 5 is the cross-sectional view of the flexible package of another example of the utility model.Among the figure, 3 is the EVOH+PA layer, and 1 is the PO layer, 2 is the PA layer, and 4 is the adhering resin layer, and 1a is an innermost layer PO layer, 1b is an outermost layer PO layer, 1c outside P O layer, 2a are inboard PA layer, and 2c is an outside P A layer, 2b is an outermost layer PA layer, 4a is one deck adhering resin layer, and 4b is another layer adhering resin layer, and 4c is another layer adhering resin layer.The specific embodiment

Followingly will describe flexible package of the present utility model in detail.

As the polyolefin that uses in the utility model (PO), can enumerate high density polyethylene (HDPE) (HDPE), low density polyethylene (LDPE) (LDPE), polypropylene (PP), polystyrene (PS) etc.The air penetrability height of PO can not play the effect that intercepts gas, but PO has that relative density is little, chemical proofing and characteristics such as water-tolerant, excellent mechanical intensity and electrical insulating property.

As the ethylene-vinyl alcohol copolymer that uses in the utility model (EVOH), it is good to have good gas-barrier properties, oil resistivity, organic solvent resistance and the transparency.

As the polyamide (PA) that uses in the utility model, can enumerate polycaprolactam (nylon 6), nylon 11 (nylon 11), poly-lauramide (nylon 12), polyhexamethylene adipamide (polyamide 66) etc.Characteristics such as that polyamide has is tough and tensile, flexibility, adhesion are strong, wear-resisting, oil resistant, water-fast, antienzyme bacterium.

EVOH and PA can mix as required, can obtain EVOH and PA mixture by method as known in the art, as EVOH and PA are mixed the back coextrusion.

So long as can get final product by the resin that each interlayer is bonding, particular restriction does not preferably adopt carboxyl acid modified vistanex etc. as the adhering resin that uses in the utility model.Carboxyl acid modified vistanex is to contain unsaturated carboxylic acid or its acid anhydride (maleic anhydride etc.) olefin polymer or the copolymer as copolymer composition; Or make the graft copolymer of unsaturated carboxylic acid or its acid anhydride grafting gained on olefin polymer or copolymer.Adhering resin described in the present specification comprises the mixture of above-mentioned simple adhering resin and it and other materials.

Flexible package of the present utility model, at least a portion are multilayer structure making, and the intermediate layer of this multilayer structure making is the EVOH+PA layer.Here, so-called intermediate layer is meant except that the outermost layer of sandwich construction and the layer the innermost layer.The EVOH+PA layer has better mechanical property and barrier property.

Further, this multilayer structure making is five layers, comprises one deck PO layer, two-layer PA layer, one deck adhering resin layer and one deck EVOH+PA layer.

Further, this multilayer structure making is seven layers, comprises one deck PO layer, three layers of PA layer, two-layer bonded resin bed and one deck EVOH+PA layer.

Further, this multilayer structure making is seven layers, comprises two-layer PO layer, two-layer PA layer, two-layer bonded resin bed and one deck EVOH+PA layer.

Further, this multilayer structure making is nine layers, comprises two-layer PO layer, three layers of PA layer, three layers of adhering resin layer and one deck EVOH+PA layer.

Further, described two-layer PA layer is the inboard PA layer that is positioned at the outermost outermost layer PA layer of described multilayer structure making and is positioned at described EVOH+PA layer inboard, described one deck PO layer is the innermost layer PO layer that is positioned at the innermost layer of described multilayer structure making, disposes described one deck adhering resin layer between described inboard PA layer and the described innermost layer PO layer.

Further, described three layers of PA layer are the outside P A layer in the outermost outermost layer PA layer that is positioned at described multilayer structure making, the inboard PA layer that is positioned at described EVOH+PA layer inboard and the described EVOH+PA layer outside, described one deck PO layer is the innermost layer PO layer that is positioned at the innermost layer of described multilayer structure making, dispose one deck adhering resin layer between described outermost layer PA layer and the described outside P A layer, dispose another layer adhering resin layer between described inboard PA layer and the described innermost layer PO layer.

Further, described two-layer PA layer is the outside P A layer that is positioned at the inboard PA layer of described EVOH+PA layer inboard and the described EVOH+PA layer outside, and described two-layer PO layer is to be positioned at the innermost layer PO layer of innermost layer of described multilayer structure making and the outermost outermost layer PO layer that is positioned at described multilayer structure making.Dispose one deck adhering resin layer between described outermost layer PO layer and the described outside P A layer, dispose another layer adhering resin layer between described inboard PA layer and the described innermost layer PO layer.

Further, described three layers of PA layer are the outermost outermost layer PA layer that is positioned at described multilayer structure making, be positioned at the inboard PA layer of described EVOH+PA layer inboard and the outside P A layer in the described EVOH+PA layer outside, described two-layer PO layer is to be positioned at the innermost layer PO layer of innermost layer of described multilayer structure making and the outside P O layer that is positioned at the described outside P A layer outside, dispose one deck adhering resin layer between described inboard PA layer and the described innermost layer PO layer, dispose another layer adhering resin layer between described outermost layer PA layer and the described outside P O layer, dispose another layer adhering resin layer between described outside P A layer and the described outside P O layer.

In the utility model, the PO layer can be the layer (resin bed of the same race melt extrudes back multilayer adjacent one another are as one deck) of extrusion by melting acquisition.The PO layer is preferably the layer that PO or PO and ethylene-vinyl acetate copolymer (EVA) mixture form.More preferably, innermost layer PO layer is the layer that PO and ethylene-vinyl acetate copolymer (EVA) mixture form.

Wherein, the thickness of described EVOH+PA layer is 1-30 μ m, and the thickness of described adhering resin layer is 1-20 μ m, and the thickness of described PA layer is 1-30 μ m, and the thickness of described innermost layer PO layer is 10-150 μ m.Preferably, the thickness of described EVOH+PA layer is 1-15 μ m, and the thickness of described adhering resin layer is 1-15 μ m, and the thickness of described PA layer is 1-15 μ m, and the thickness of described innermost layer PO layer is 10-20 μ m.

Wherein, the thickness of described EVOH+PA layer is 1-30 μ m, and the thickness of described adhering resin layer is 1-20 μ m, and the thickness of described PA layer is 1-30 μ m, and the thickness of described innermost layer PO layer is 10-150 μ m, and the thickness of described outermost layer PO layer is 5-50 μ m.Preferably, the thickness of described EVOH+PA layer is 1-15 μ m, and the thickness of described adhering resin layer is 1-15 μ m, and the thickness of described PA layer is 1-15 μ m, and the thickness of described innermost layer PO layer is 30-70 μ m, and the thickness of described outermost layer PO layer is 10-20 μ m.

Wherein, the thickness of described EVOH+PA layer is 1-30 μ m, and the thickness of described adhering resin layer is 1-20 μ m, and the thickness of described PA layer is 1-30 μ m, and the thickness of described innermost layer PO layer is 10-150 μ m, and the thickness of described outside P O layer is 5-50 μ m.Preferably, the thickness of described EVOH+PA layer is 1-15 μ m, and the thickness of described adhering resin layer is 1-15 μ m, and the thickness of described PA layer is 1-15 μ m, and the thickness of described innermost layer PO layer is 30-70 μ m, and the thickness of described outside P O layer is 10-20 μ m.

The shape of flexible package of the present utility model does not have special restriction, can comprise square, circular, oval flexible package.

As the method that obtains flexible package, comprise dry type composite algorithm, wet type composite algorithm, extrude composite algorithm, and method for processing forming such as coextrusion (coextrusion is also referred to as co-extrusion) composite algorithm.Concrete grammar does not have special restriction.As the coextrusion composite algorithm, comprise coextrusion rubbing method, coextrusion The tape casting, coextrusion blown film method etc.

Flexible package can be used for packaged food etc.For such purposes, requirement must prevent the rotten of content article.And, under the situation of the content article of easy oxidation deterioration, wish that flexible package has the extremely barrier properties for gases of height owing to the oxygen effect for packing, requirement is very difficult and satisfy like this.

Flexible package of the present utility model has the performance of excellent maintenance content quality, so optimum is used for packaged food.

The novel flexible package of this experiment is passed through EVOH is used in the intermediate layer of other materials, can keep the performances such as high barrier of EVOH.

Flexible package of the present utility model can be the main part of packing material, for example as the film of packaging bag, also can be the wherein part of packing material, for example as the epiphragma of plastic bottle cup etc.

Flexible package of the present utility model can also be used for cereal airtight package and herbage airtight package.When being used for the cereal airtight package, evoh layer in the flexible package can effectively intercept extraneous oxygen and enter, the carbon dioxide gas that breathing produced of the inner microorganism of barrier package is outwards released diffusing simultaneously, thereby form hypoxemia high carbon dioxide atmosphere at package interior, compare with common cereal packing, can effectively suppress growth and the breeding of inner mould and insect.

When flexible package of the present utility model was used for feed airtight packages such as herbage, the evoh layer in the flexible package can effectively intercept extraneous oxygen and enter, and can effectively suppress growth and the breeding of inner mould, keeps feeding quality for a long time.Simultaneously, can also effectively intercept odour components such as the butyric acid that produces in the feed, acetate and discharge, can suppress mouse etc. and nibble the loss that feed causes.

In addition, flexible package of the present utility model can also be used for soil-fumigating covering film.Compare with common stifling cover film; evoh layer in this flexible package can effectively intercept fumigant gases such as chloropicrin, Celfume and be penetrated into extraneous space; in the protection environment, can improve the effective rate of utilization of fumigant, and then can reduce consumption and reduce stifling cost.

Example when specifying flexible package of the present utility model as packaging bag below in conjunction with accompanying drawing.

Fig. 1-5 illustrates the preferred embodiment of flexible package of the present utility model.

Fig. 1 illustrates the example of the flexible package of one of the utility model.

Fig. 2 illustrates the cross-sectional view of Fig. 1 flexible package along A-A.Among Fig. 2, the part of flexible package of the present utility model is a multilayer structure making, for multilayer structure making constitutes by five layers, comprises one deck PO layer 1, two-layer PA layer 2, one deck adhering resin layer 4 and one deck EVOH+PA layer 3.Outermost layer to innermost layer by multilayer structure making is followed successively by outermost layer PA layer 2b, EVOH+PA layer 3, inboard PA layer 2a, adhering resin layer 4 and innermost layer PO layer 1a.Wherein, the thickness of EVOH+PA layer 3 is 1-30 μ m, and the thickness of adhering resin layer 4 is 1-20 μ m, and the thickness of PA layer 2 is 1-30 μ m, and the thickness of innermost layer PO layer 1a is 10-150 μ m.

Among Fig. 3, two parts of flexible package of the present utility model are multilayer structure making, and this multilayer structure making constitutes by seven layers, comprise one deck PO layer 1, three layers of PA layer 2, two-layer bonded resin bed 4 and one deck EVOH+PA layer 3.Outermost layer to innermost layer by multilayer structure making is followed successively by outermost layer PA layer 2b, one deck adhering resin layer 4b, outside P A layer 2c, EVOH+PA layer 3, inboard PA layer 2a, another layer adhering resin layer 4a and innermost layer PO layer 1a.Wherein, the thickness of EVOH+PA layer 3 is 1-30 μ m, and the thickness of adhering resin layer 4 is 1-20 μ m, and the thickness of PA layer 2 is 1-30 μ m, and the thickness of innermost layer PO layer 1a is 10-150 μ m.

Among Fig. 4, the part of flexible package of the present utility model is a multilayer structure making, and this multilayer structure making constitutes by seven layers, comprises two-layer PO layer 1, two-layer PA layer 2, two-layer bonded resin bed 4 and one deck EVOH+PA layer 3.Outermost layer to innermost layer by multilayer structure making is followed successively by outermost layer PO layer 1b, one deck adhering resin layer 4b, outside P A layer 2c, EVOH+PA layer 3, inboard PA layer 2a, another layer adhering resin layer 4a and innermost layer PO layer 1a.Wherein, the thickness of described EVOH+PA layer is 1-30 μ m, and the thickness of described adhering resin layer is 1-20 μ m, and the thickness of described PA layer is 1-30 μ m, and the thickness of described innermost layer PO layer is 10-150 μ m, and the thickness of described outermost layer PO layer is 5-50 μ m.

Among Fig. 5, the part of flexible package of the present utility model is a multilayer structure making, and this multilayer structure making is nine layers, comprises two-layer PO layer 1, three layers of PA layer 2, three layers of adhering resin layer 4 and one deck EVOH+PA layer 3.Outermost layer to innermost layer by multilayer structure making is followed successively by outermost layer aramid layer 2b, another layer adhering resin layer 4b, outside P O layer 1c, another layer adhering resin layer 4c, outside P A layer 2c, EVOH+PA layer 3, inboard PA layer 2a, one deck adhering resin layer 4a and innermost layer PO layer 1a.Wherein, the thickness of EVOH+PA layer 3 is 1-30 μ m, and the thickness of adhering resin layer 4 is 1-20 μ m, and the thickness of PA layer 2 is 1-30 μ m, and the thickness of innermost layer PO layer 1a is 10-150 μ m, and the thickness of outside P O layer 1c is 5-50 μ m.

More than explanation is just illustrative for the utility model; and it is nonrestrictive; those of ordinary skills understand; under the situation of the spirit and scope that do not break away from claims and limited; can make corresponding modification, variation or equivalent process, but all will fall in the protection domain of the present utility model.

Claims (12)

1. a flexible package is characterized in that, at least a portion is a multilayer structure making, and the intermediate layer of described multilayer structure making is ethylene-vinyl alcohol copolymer and polyamide mixed layer (3).

2. flexible package according to claim 1, it is characterized in that, this multilayer structure making is five layers, comprises one deck polyolefin layer (1), two-layer aramid layer (2), one deck adhering resin layer (4) and one deck ethylene-vinyl alcohol copolymer and polyamide mixed layer (3).

3. flexible package according to claim 1, it is characterized in that, this multilayer structure making is seven layers, comprises one deck polyolefin layer (1), three strata amide layer (2), two-layer bonded resin bed (4) and one deck ethylene-vinyl alcohol copolymer and polyamide mixed layer (3).

4. flexible package according to claim 1, it is characterized in that, this multilayer structure making is seven layers, comprises two-layer polyolefin layer (1), two-layer aramid layer (2), two-layer bonded resin bed (4) and one deck ethylene-vinyl alcohol copolymer and polyamide mixed layer (3).

5. flexible package according to claim 1, it is characterized in that, this multilayer structure making is nine layers, comprises two-layer polyolefin layer (1), three strata amide layer (2), three layers of adhering resin layer (4) and one deck ethylene-vinyl alcohol copolymer and polyamide mixed layer (3).

6. flexible package according to claim 2, it is characterized in that, described two-layer aramid layer (2) is for being positioned at the outermost outermost layer aramid layer (2b) of described multilayer structure making and being positioned at described ethylene-vinyl alcohol copolymer and the inboard aramid layer (2a) of polyamide mixed layer (3) inboard, described one deck polyolefin layer (1) is the innermost layer polyolefin layer (1a) that is positioned at the innermost layer of described multilayer structure making, disposes described one deck adhering resin layer (4) between described inboard aramid layer (2a) and the described innermost layer polyolefin layer (1a).

7. flexible package according to claim 3, it is characterized in that, described three strata amide layer (2) are for being positioned at the outermost outermost layer aramid layer (2b) of described multilayer structure making, be positioned at the outside aramid layer (2c) in inboard inboard aramid layer (2a) of described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) and described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) outside, described one deck polyolefin layer (1) is the innermost layer polyolefin layer (1a) that is positioned at the innermost layer of described multilayer structure making, dispose one deck adhering resin layer (4b) between described outermost layer aramid layer (2b) and the described outside aramid layer (2c), dispose another layer adhering resin layer (4a) between described inboard aramid layer (2a) and the described innermost layer polyolefin layer (1a).

8. flexible package according to claim 4, it is characterized in that, described two-layer aramid layer (2) is for being positioned at the outside aramid layer (2c) in inboard inboard aramid layer (2a) of described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) and described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) outside, described two-layer polyolefin layer (1) is innermost layer polyolefin layer (1a) of innermost layer that is positioned at described multilayer structure making and the outermost outermost layer polyolefin layer (1b) that is positioned at described multilayer structure making, dispose one deck adhering resin layer (4b) between described outermost layer polyolefin layer (1b) and the described outside aramid layer (2c), dispose another layer adhering resin layer (4a) between described inboard aramid layer (2a) and the described innermost layer polyolefin layer (1a).

9. flexible package according to claim 5, it is characterized in that, described three strata amide layer (2) are for being positioned at the outermost outermost layer aramid layer (2b) of described multilayer structure making, be positioned at the outside aramid layer (2c) in inboard inboard aramid layer (2a) of described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) and described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) outside, described two-layer polyolefin layer (1) is the innermost layer polyolefin layer (1a) of the innermost layer that is positioned at described multilayer structure making and the outside polyolefin layer (1c) that is positioned at described outside aramid layer (2c) outside, dispose one deck adhering resin layer (4a) between described inboard aramid layer (2a) and the described innermost layer polyolefin layer (1a), dispose another layer adhering resin layer (4b) between described outermost layer aramid layer (2b) and the described outside polyolefin layer (1c), dispose another layer adhering resin layer (4c) between described outside aramid layer (2c) and the described outside polyolefin layer (1c).

10. according to claim 6 or 7 described flexible packages, it is characterized in that, the thickness of described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) is 1-30 μ m, the thickness of described adhering resin layer (4) is 1-20 μ m, the thickness of described aramid layer (2) is 1-30 μ m, and the thickness of described innermost layer polyolefin layer (1a) is 10-150 μ m.

11. flexible package according to claim 8, it is characterized in that, the thickness of described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) is 1-30 μ m, the thickness of described adhering resin layer (4) is 1-20 μ m, the thickness of described aramid layer (2) is 1-30 μ m, the thickness of described innermost layer polyolefin layer (1a) is 10-150 μ m, and the thickness of described outermost layer polyolefin layer (1b) is 5-50 μ m.

12. flexible package according to claim 9, it is characterized in that, the thickness of described ethylene-vinyl alcohol copolymer and polyamide mixed layer (3) is 1-30 μ m, the thickness of described adhering resin layer (4) is 1-20 μ m, the thickness of described aramid layer (2) is 1-30 μ m, the thickness of described innermost layer polyolefin layer (1a) is 10-150 μ m, and the thickness of described outside polyolefin layer (1c) is 5-50 μ m.

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