JP2006001609A - LAMINATE MANUFACTURING METHOD, PACKAGING BAG AND PACKAGING BODY - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package capable of maintaining sufficient bag strength without impairing the shape of a packaging bag even when an alkaline content is filled, and a method for producing a laminate suitable as a material for the packaging body, and Provide packaging bags.
SOLUTION: A packaging body in which an alkaline content containing phenols is stored in a packaging bag comprising a laminated structure in which a resin layer and a metal foil layer are directly laminated, a resin layer containing phenols and a metal foil A packaging body in which alkaline contents are stored in a packaging bag comprising a laminated body including a laminated structure in which layers are directly laminated, and a step of subjecting at least one surface of the extruded laminate resin to melt-extrusion and subjecting it to surface activation treatment, extruded laminate resin A method for producing a laminate comprising a step of laminating a metal foil layer on the surface activation treatment surface of the substrate to form a laminate interface, a step of causing phenols to act on the laminate interface under alkaline conditions, and using the laminate A packaging bag.
[Selection figure] None

Description

  The present invention relates to a package containing alkaline contents, a method for producing a laminate suitable as a material for a packaging bag constituting the package, and a packaging bag using the laminate obtained by the production method.

  Conventionally, a packaging bag in which a laminated body mainly composed of a plastic film is formed into a bag shape is widely used. Various characteristics required for the packaging bag, for example, gas barrier property and light shielding property, physical characteristics as a container (even if dropped) In view of characteristics such as difficulty in breaking bags and difficulty in opening holes, etc., a laminate in which a plurality of material films are combined is used. However, depending on the application, lamination of a metal film and a plastic film may be required. Moreover, in so-called PTP packaging, a configuration in which a container molded with a transparent resin is sealed with a metal film from the viewpoint of achieving both visibility and storage stability of the contents, and in such a case, the metal foil layer and the resin layer are also used. The technology which adhere | attaches these well is requested | required.

  Here, as a method of laminating a metal film and a plastic film, for example, a so-called dry laminating method is generally used in which an adhesive solution is applied to a plastic film, and after the solvent is removed by volatilization, the metal film is stacked and pressure-bonded. The dry laminating method is a laminating method widely used in the packaging industry because various material films can be laminated with sufficient adhesive strength by appropriately selecting the type of adhesive.

  However, it may not be preferable to use the dry lamination method depending on the application. For example, using a laminate in which a metal film and a plastic film are laminated by a dry laminating method, a packaging bag is formed so that the plastic film is on the inner surface side, and acid, alkali, organic solvent, or surfactant is included. When the filled contents are filled, the contents diffuse and permeate the innermost layer of the packaging bag, reach the adhesive layer formed by the dry laminating method, and dissolve or modify the adhesive layer. Interfacial debonding may occur between the film and the plastic film. Such a phenomenon is a phenomenon that may occur regardless of whether or not the laminated body includes a metal film layer. However, particularly when a part of the laminated body is composed of a metal film layer, the metal film is used. Since the layer blocks the diffusion of the contents, the acid, alkali, etc. tend to stay at the interface between the metal film layer and the layer facing the metal film layer, and the interface peeling occurs and the shape of the packaging bag is impaired. More likely.

  On the other hand, as a method of laminating a metal film and a plastic film without using an adhesive, a molten thermoplastic resin is laminated on a metal film as a base material and bonded, or a molten thermoplastic resin is bonded. There is a so-called melt laminating method in which two base metal films are sandwiched and pressed. The melt laminating method is generally inferior to the dry laminating method in terms of versatility and adhesive strength, but there is little possibility that the adhesive interface is affected by the contents and the shape of the packaging bag is damaged. Further, in order to improve the adhesive strength in the melt laminating method, there are special adhesive properties in Cited Documents 1 and 2 (Cited Document 1: Japanese Patent Laid-Open No. 7-205365, Cited Document 2: Japanese Patent Laid-Open No. 9-058700). Lamination methods using resins are cited documents 3 to 5 (cited document 3: JP-A-7-314629, cited document 4: JP-A-9-234845, cited document 5: JP-A 2003-266626) and the like. Describes a method for producing a laminate having a step of corona discharge treatment of a plastic substrate and a step of ozone treatment of an extruded laminate resin.

However, the corona discharge treatment is not suitable for the metal film, and therefore the methods described in the above cited documents 3 to 5 are unsuitable when laminating the metal film and the plastic film. The methods described in the above cited references 1 and 2 are also not easy methods in that a special adhesive resin layer needs to be used. Glass bottles, metal tubes, etc. may be used when acids, alkalis, etc. are filled, but in view of ease of use and disposal after use, the use of these glass bottles, metal tubes, etc. is preferred. There is nothing.
Even when an acid, an alkali, an organic solvent, a surfactant, or the like is filled, there has been a demand for a package that can maintain sufficient bag strength without impairing the shape of the packaging bag.

JP-A-7-205365 JP-A-9-058700 JP 7-314629 A JP-A-9-234845 JP 2003-266626 A

  The present invention has been made in view of the above circumstances, and in the case of filling an alkaline content or the like that was unsuitable for filling as a content when a dry bag method was conventionally used to constitute a packaging bag. Even if it exists, it aims at providing the manufacturing method of the laminated body suitable as a packaging body which can maintain a packaging bag shape, and the material of the packaging bag which comprises this packaging body.

  As a result of intensive studies to achieve the above object, the present inventor has accommodated an alkaline content containing phenols in a packaging bag made of a laminate including a laminated structure in which a resin layer and a metal foil layer are directly laminated. A packaging body or a packaging body containing alkaline contents in a packaging bag comprising a laminated structure in which a phenolic-containing resin layer and a metal foil layer are directly laminated has a long-lasting shape of the packaging bag. It was found that it can be maintained. Moreover, it discovered that the laminated body obtained by the specific manufacturing method was suitable as a material of the said packaging bag, and came to make this invention.

That is, this invention provides the following package bodies, the manufacturing method of a laminated body, and a packaging bag.
Claim 1:
A packaging body characterized in that an alkaline content containing phenols is stored in a packaging bag made of a laminated body including a laminated structure in which a resin layer and a metal foil layer are directly laminated.
Claim 2:
A packaging body characterized in that alkaline contents are housed in a packaging bag made of a laminate including a laminated structure in which a phenolic-containing resin layer and a metal foil layer are directly laminated.
Claim 3:
The package according to claim 1 or 2, wherein the resin layer is an extruded laminate resin layer.
Claim 4:
The surface of the resin layer facing the metal foil layer is subjected to surface activation treatment by any one or combination of ozone treatment, corona treatment, and oxidation treatment by resin temperature. Packaging.
Claim 5:
The package according to any one of claims 1 to 4, wherein the contents further contain a surfactant.
Claim 6:
The package according to any one of claims 1 to 5, wherein the content is a hair dye.
Claim 7:
A method for producing a laminate including a metal foil layer and an extruded laminate resin layer laminated so as to face at least one side of the metal foil layer, and the following steps (1) to (3):
(1) Step: A step of melt-extruding an extruded laminate resin into a film and subjecting at least one surface to a surface activation treatment,
(2) Step: A step of laminating a metal foil layer on the surface activation treatment surface of the extruded laminate resin obtained in the step (1) to form a laminated interface between the metal foil layer and the extruded laminate resin layer,
(3) Step: A step of causing phenols to act on the laminated interface formed in the step (2) under alkaline conditions.
The manufacturing method of the laminated body characterized by including.
Claim 8:
The manufacturing method according to claim 7, wherein the surface activation treatment is any one or a combination of ozone treatment, corona treatment, and oxidation treatment by resin temperature.
Claim 9:
The step (3) is a step in which the lamination interface is subjected to the action of phenols under alkaline conditions by phenols and an alkaline compound that diffuse in the extruded laminate resin layer and reach the lamination interface. Or the manufacturing method of 8.
Claim 10:
In the step (3), the laminate interface is subjected to alkaline conditions by the phenols preliminarily blended in the extruded laminate resin layer and the alkaline compound that diffuses in the extruded laminate resin layer and reaches the laminate interface. The production method according to claim 7 or 8, which is a step of receiving an action of phenols.
Claim 11:
The manufacturing method according to any one of claims 7 to 10, wherein the step (3) is a step performed under a temperature condition of 40 ° C or higher.
Claim 12:
A packaging bag formed of a laminate obtained by the production method according to claim 7.

  Even if the package obtained by the present invention is filled with an alkaline content or the like that was unsuitable for filling as a content when a conventional dry laminating method is used to constitute a packaging bag, It is a package capable of maintaining a sufficient bag strength, and thus a package strength filled with the contents, without impairing the shape of the packaging bag. Moreover, according to the manufacturing method of this invention, the laminated body suitable as a material of the packaging bag which comprises the said package body can be provided.

Hereinafter, the present invention will be described in more detail.
The package of the present invention is characterized in that an alkaline content containing phenols is stored in a packaging bag made of a laminate including a laminated structure in which a resin layer and a metal foil layer are directly laminated, or A packaging body characterized in that alkaline contents are housed in a packaging bag made of a laminate including a laminated structure in which a phenolic resin layer and a metal foil layer are directly laminated.
Moreover, the method for producing a laminate of the present invention is a method for producing a laminate comprising a metal foil layer and an extruded laminate resin layer laminated so as to face at least one side of the metal foil layer. (1)-(3) each process,
(1) Step: A step of melt-extruding an extruded laminate resin into a film and subjecting at least one surface to a surface activation treatment,
(2) Step: A step of laminating a metal foil layer on the surface activation treatment surface of the extruded laminate resin obtained in the step (1) to form a laminated interface between the metal foil layer and the extruded laminate resin layer,
(3) Step: A step of causing phenols to act on the laminated interface formed in the step (2) under alkaline conditions.
It is a manufacturing method of the laminated body characterized by including.

As the material of the metal foil layer, any metal used in the field of packaging materials can be used, and examples thereof include aluminum, steel, castings, and iron. Moreover, the alloy which consists of these multiple types may be sufficient.
In the present invention, from the viewpoint of processing surface and cost, the metal foil layer is preferably an aluminum layer or an aluminum alloy layer.

  Examples of the material for the resin layer include a polyethylene resin, an ethylene copolymer resin, a polypropylene resin, a nylon resin, a polyester resin, a so-called adhesive resin, and the like. These may be used alone or in combination of two or more. Also, from the viewpoint of improving familiarity with the metal foil layer, the resin layer is preferably an extruded laminate resin layer, and the resin layer material can also be melt-extruded into a film during extrusion lamination processing. It is preferable that it is a resin.

  Here, examples of the polyethylene resin include a homopolymer of ethylene and a copolymer of ethylene and α-olefin, and more specifically, for example, a high pressure method low density polyethylene, high density polyethylene, medium A density polyethylene, a linear low density polyethylene, an ultra-low density polyethylene, etc. can be mentioned. Examples of the α-olefin herein include 3 to 18 carbon atoms such as propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-decene and 1-octadecene. An α-olefin can be mentioned, and these can be used alone or in combination of two or more.

  Examples of the ethylene copolymer resin include a resin obtained by copolymerizing a comonomer containing a polar group and ethylene, and more specifically, for example, EMA (ethylene-methacrylic acid copolymer). Ethylene-unsaturated carboxylic acid copolymer resin, ethylene-unsaturated carboxylic acid ester copolymer resin such as EMAA (ethylene-methyl methacrylate copolymer), ethylene-vinyl ester copolymer resin, ethylene-vinyl alcohol copolymer Examples thereof include a polymer resin, an ethylene-epoxy compound copolymer resin, and an ionomer resin. The ethylene-maleic anhydride copolymer resin is an ethylene copolymer resin, but also corresponds to a so-called adhesive resin.

  Examples of the polypropylene resin include a homopolymer of propylene, a copolymer of olefin and propylene other than propylene, and the like. Examples of olefins other than propylene include ethylene, 1-butene, 1-hexene, 1-octene, and the like. These may be used alone or in combination of two or more.

  The resin used in the present invention further includes known additives such as antioxidants, antiblocking agents, weathering agents, neutralizing agents, flame retardants, antistatic agents, antifogging agents, lubricants, dispersants, You may mix | blend organic fillers, such as a pigment, and an inorganic filler suitably. It is also preferable to blend phenols and / or alkaline compounds in the resin.

In the present invention, the surface activation treatment means a treatment for generating a certain activation point or more on the surface to be treated and enabling strong adhesion to the substrate to be bonded. As such surface activation treatment, for example, any of ozone treatment, corona discharge treatment, electron beam irradiation treatment, ultraviolet irradiation treatment, flame plasma treatment, atmospheric pressure plasma treatment, low pressure plasma treatment, or oxidation treatment by resin temperature Alternatively, a combination thereof may be mentioned, but from the viewpoint of interlayer adhesion, any one or a combination of ozone treatment, corona treatment, or oxidation treatment by resin temperature is preferable.
In the laminate constituting the packaging bag used in the packaging body of the present invention, it is preferable that the surface activation treatment is performed on the surface of the resin layer constituting the laminate that faces the metal foil layer.
Moreover, in the (1) process in the manufacturing method of the laminated body of this invention, extrusion lamination resin is melt-extruded in the shape of a film, The said surface activation process is given to the at least one surface.

Examples of the ozone treatment include a method of spraying a gas (for example, air) containing ozone from a nozzle or a slit-shaped outlet.
Here, the ozone treatment amount is usually 10 to 30 mg, preferably 15 to 20 mg, per unit area (m ² ) of the molten film. If the amount of ozone treatment is too large, the working environment and the human body may be affected. On the other hand, if the amount of ozone treatment is too small, the interlayer may not be adhered.

Examples of the corona discharge treatment include a method of passing a surface to be treated under a generated corona atmosphere using a commercially available corona discharge treatment machine.
In this case, the atmosphere of the corona discharge treatment may be in the air, or may be an atmosphere adjusted with an inert gas (for example, nitrogen). The corona discharge treatment condition is usually 0.8 to 1 kW · min / m ² or more, preferably 0.8 to 0.9 kW · min / m ² . If the treatment conditions are too gentle, the surface roughness of the adhesive surface may be reduced. On the other hand, if the treatment conditions are too severe, the amount of adhesive applied may be reduced or the degree of treatment may be reduced.

Examples of the electron beam irradiation treatment include a method of irradiating the surface to be processed with an electron beam generated by an electron beam accelerator using a commercially available electron beam irradiation apparatus.
In this case, the atmosphere of the electron beam irradiation treatment may be in the air, or may be an atmosphere adjusted with an inert gas (for example, nitrogen) or the like. The electron beam irradiation treatment condition is usually 5 to 200 kGy, preferably 15 to 30 kGy. If the processing conditions are too gentle, the film adhesive strength may be insufficient. On the other hand, if the processing conditions are too severe, the entire workpiece may be deteriorated.

Examples of the ultraviolet irradiation treatment include a method of irradiating the surface to be processed with ultraviolet rays having a wavelength of 100 to 300 nm, for example.
In this case, the atmosphere of the ultraviolet irradiation treatment may be in the air, or may be an atmosphere adjusted with an inert gas (for example, nitrogen) or the like.

  The oxidation treatment by the resin temperature is a method of oxidizing the surface of the molten resin by forming the extruded laminate resin by extruding and forming the resin at a higher temperature than the melting point in an environment where oxygen coexists. . The resin temperature of the extruded laminate resin when performing surface oxidation treatment by the resin temperature is appropriately set according to the melting point of the material to be used. Examples of the extruded laminate resin include polyethylene resins, ethylene copolymer resins, and polypropylene. When using a system resin, it is 270-310 degreeC normally, Preferably it is 300-310 degreeC.

The package of the present invention contains phenols as contents, or contains phenols as a compounding agent for the resin layer, and step (3) in the method for producing a laminate of the present invention comprises ( 2) A step of allowing phenols to act on the laminated interface formed in the step.
The phenols used in the present invention are not particularly limited. For example, phenol, orthoaminophenol, metaaminophenol, paraaminoorthocresol, paraaminophenol, resorcin, cetanol, cresol, methylphenol, aminonitrophenol, Orthoaminophenol or derivatives thereof may be mentioned, and these may be used alone or in combination of two or more.

  The package of the present invention contains alkaline contents, and the step (3) in the method for producing a laminate of the present invention includes placing the laminated interface formed in the step (2) in an alkaline environment. It is a placing process. The alkaline compound used to make the contents alkaline or to place the laminated interface in an alkaline environment is not particularly limited, but examples include sodium hydroxide, ammonia, aromatic amine, potassium hydroxide, and the like. These may be mentioned, and these may be used alone or in combination of two or more.

  In addition, as temperature conditions in the said (3) process, it is 40 degreeC or more normally, Preferably it is 50 degreeC or more, More preferably, it is 80-110 degreeC, More preferably, it is 90-100 degreeC. If the temperature is too low, the action of the phenols on the laminate interface may be insufficient, and the object of the present invention may not be achieved. On the other hand, if the temperature is too high, the core part wrinkles, poor dimensions, etc. may occur. There is.

In the step (3) in the method for producing a laminate of the present invention, as a specific method for causing phenols to act on the laminate interface under alkaline conditions, for example,
(I) A method in which a solution containing phenols and an alkaline compound is supplied from the extruded laminate resin layer side to diffuse and permeate the extruded laminate resin layer so that the phenols and the alkaline compound reach the lamination interface,
(II) Phenols are allowed to coexist in the extruded laminate resin layer in advance, and a solution containing an alkaline compound is supplied from the extruded laminate resin layer side so that the extruded laminate resin layer is diffused and permeated. And a method of causing the alkaline compound to reach the laminated interface,
(III) An alkaline compound is allowed to coexist in the extruded laminate resin layer and a solution containing phenols is supplied from the extruded laminate resin layer side so that the extruded laminate resin layer is diffused and permeated. And a method of causing the alkaline compound to reach the laminated interface,
(IV) Phenols and an alkaline compound are allowed to coexist in the extruded laminate resin layer in advance, and a solvent is supplied from the extruded laminate resin layer side to diffuse and permeate the extruded laminate resin layer. A method of causing an alkaline compound to reach the laminated interface;
Can be mentioned.

More specifically, as the method of (I) above, for example, a method of immersing a laminate containing a metal foil layer and an extruded laminate resin layer in a phenol-containing alkaline solution containing the alkaline compound and a solvent, the phenols The method etc. which apply | coat the containing alkaline solution to the surface by the side of the extrusion lamination resin layer of the said laminated body are mentioned. In addition, a laminate including a metal foil layer and an extruded laminate resin layer is used, a packaging bag is formed in advance so that the extruded laminate resin layer is on the inner surface side, and the phenols-containing alkaline solution is filled as the contents. The method (I) can also be executed.
In the case where the phenol-containing alkaline solution is a filler itself, that is, when the target filler (product or the like) contains phenols, an alkali compound, and a solvent, the steps (1) and (2) Since the packaging bag is formed after the process and then the filling is filled, the process (3) in the present invention, the bag making process of the laminated body, and the product filling process can be performed together. Very effective in terms of cost.

  Examples of the solvent used here include water, alcohols, and various organic solvents, such as propylene glycol, isopropyl alcohol, methyl ethyl ketone, ethyl acetate, and toluene. These may be used alone or in combination of two or more. Of these, propylene glycol, isopropyl alcohol, and ethanol are preferably used from the viewpoint of solubility.

  Specific examples of the methods (II) to (IV) can also be performed in the same manner as the method (I). If a laminate containing a phenol-containing extruded laminate resin layer in which phenols are blended (kneaded) in advance as the laminate in the method (I) is used, and an alkaline solution containing an alkaline compound and a solvent is used, the above (II) A laminate including an alkaline compound-containing extruded laminate resin layer in which an alkaline compound is blended in advance as a laminate in the method (I) above, and a phenol solution containing a phenol and a solvent is used. If it is used, it becomes a specific example of the method (III), and a laminate including a phenol / alkali compound-containing extruded laminate resin layer in which phenols and an alkaline compound are blended in advance is used as the laminate in the method (I). If the solvent is filled, a specific example of the method (IV) is obtained.

  Furthermore, in the step (3) in the method for producing a laminate of the present invention, “a solution containing phenols and an alkaline compound” in the method (I) described above, “a solution containing an alkaline compound” in the method (II), The “solution containing phenols” in the method of (III) or the “solvent” in the method of (IV) is further a surfactant from the viewpoint of causing the phenols to act better on the lamination interface under alkaline conditions. Is preferably blended. Moreover, it is suitable that the content which comprises the package of this invention also contains surfactant.

  Examples of the surfactant include lauryl sulfate, cetyl nitrate, sodium alkylbenzene sulfonate, sodium alkyl sulfate ester, sodium alkyl ether sulfate ester, alpha sulfo fatty acid ester sodium, sodium alpha olefin sulfonate, polyoxyethylene alkyl ether and the like. These may be used alone or in combination of two or more.

  The alkaline contents containing phenols constituting the package of the present invention, or the contents filled in the packaging bag formed by the laminate produced by the method for producing a laminate of the present invention, Although it does not specifically limit, For example, a hair dye (hair coloring agent), a permanent agent, a mold remover, alcohols etc. can be mentioned.

  Commercially available products can be used as the hair dye, for example, Wella Japan brand name Wellatone, Hoyu brand name Elegance Cream Tone, Dime Healthcare brand name Cover Gray, Henkel Lion brand name Paon Soft, Hoyu brand product Name Vigen Hair Color, Henkel Lion Product Name Feminine Hair Color, Kanebo Product Name Kate Hair Color Classic Brown, Hoyu Product Name View Teen Hair Color Apricot Brown, Hoyu Product Name View Teen Hair Color Peach Brown, Kanebo Product Name One-component or multiple-component hair dyes such as Cream-in Natural Color Honey Brown and Kanebo's trade name Cream-In Natural Color Natural Beige can be mentioned. In addition, when a hair dye is a multiple liquid type, you may fill each liquid into the container formed with the laminated body of this invention as said hair dye.

  In the laminate as the material of the packaging bag constituting the packaging body of the present invention, or the laminate obtained by the production method of the present invention, the metal foil layer is laminated facing at least one surface side of the metal foil layer. The layer structure other than the resin layer is not particularly limited, but as a container even if the contents contain components such as the acid, alkali, organic solvent, or surfactant. From the viewpoint of not impairing the appearance of the above, at least the layer structure corresponding to the section from the innermost surface of the packaging bag in contact with the contents to the metal foil layer should not use a solvent-type adhesive such as a dry laminate adhesive. Is preferred.

Here, the layer configuration of the section from the innermost surface of the container to the metal foil layer is not particularly limited, but examples thereof include the following layer configurations.
(I) (PE layer) / (PE layer as extrusion laminate resin layer) / (metal foil layer)
(Ii) (PE layer) / (Ny layer) / (PE layer) / (PE layer as extruded laminate resin layer) / (metal foil layer)
(Iii) (PE layer) / (EvOH layer) / (PE layer) / (PE layer as extruded laminate resin layer) / (metal foil layer)
(Iv) (PP layer) / (Ny layer) / (PP layer) / (PE layer as extruded laminate resin layer) / (metal foil layer)
(V) (PP layer) / (EvOH layer) / (PP layer) / (PE layer as extruded laminate resin layer) / (metal foil layer)
(Vi) (PP layer) / (PE layer as extrusion laminate resin layer) / (metal foil layer)
In the present invention, “PE layer” means “polyethylene resin layer or ethylene copolymer resin layer”, “PP layer” means “polypropylene resin layer”, and “Ny layer”. Means “nylon-based resin layer”, and “EvOH layer” means “ethylene-vinyl alcohol copolymer resin layer”.

Moreover, the packaging bag which comprises the packaging body of this invention, or the packaging bag formed with the laminated body obtained by the manufacturing method of the laminated body of this invention is from a viewpoint which takes out a content more easily outside a packaging bag. It is preferable that a spout (port portion) is installed. Here, the port part is usually in close contact with the innermost layer of the packaging bag by heat sealing, but the port part is usually formed in a substantially circular shape in cross section, so that the laminated part that contacts the port part during heat sealing is used. Stress is applied, and in some cases, cracks may occur in some of the layers constituting the laminate. When the configurations (ii) to (v) are adopted as the layer configuration in the section from the innermost surface of the container to the metal foil layer, the intermediate Ny layer or EvOH layer serves as a buffer material, and heat seal This is suitable because stress cracks are less likely to occur. Also, PE and PP single layers play a similar role by increasing the thickness. The thickness is preferably 80 to 130 μm.
In addition, although it does not specifically limit as heat seal conditions of the said port part and a packaging bag innermost layer, Usually, it is the conditions of 170-220 degreeC * 0.3-0.5 MPa * 1-6 seconds.

In addition, (2) process in the manufacturing method of the laminated body of this invention laminates | stacks a metal foil layer on the surface activation treatment surface of the extrusion lamination resin obtained at the said (1) process, and metal foil layer and extrusion lamination resin In the step of forming a laminated interface with the layer, it is preferable that the metal foil layer and the extrusion laminated resin layer are laminated and then further crimped from the viewpoint of further improving the familiarity of the laminated interface. Moreover, it is preferable to provide an aging step for aging at a constant temperature after such pressure bonding. Such an aging temperature is usually 30 to 100 ° C, preferably 60 to 80 ° C. If the aging temperature is too high, film squeezing wrinkles, pitch deviation, etc. may occur. On the other hand, if it is too low, the interlayer strength may decrease.
In addition, in the manufacturing method of this invention, an appropriate process may be added in the range which does not impair the objective of this invention.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

[Examples 1-3, Comparative Examples 1-3]
The PET film was attached to the main feeding device of the extrusion laminator, and this PET film was fed out as one substrate, and the AL film was attached to the same device as the other substrate. Polyethylene (extruded PE) is melt extruded using a 90 mm diameter extruder equipped with a T-die to form a molten film (resin temperature 320 ° C., film take-off speed 100 m / min, film width 700 to 1000 mm, film thickness 15 μm) Then, a laminate having a layer structure of AL / extruded PE / PET was obtained by sandwiching and pressing (sand lamination) between the PET film and the AL film. By laminating the PE film in the same manner as described above on the other surface side of the AL film, a laminate from the first layer (outermost layer) to the fifth layer (innermost layer) having the layer structure shown in Table 1 below is obtained. It was. Note that the pressure-bonding between the molten film constituting the fourth layer and the AL film was performed after a predetermined amount of ozone-containing air was blown onto the molten film from a nozzle provided under the T-die.
Further, a packaging bag was formed by using the obtained laminate, filled with predetermined contents shown in Table 1, and subjected to aging for a predetermined time. After aging, a part of the laminate was cut out as a specimen, and the interlayer adhesion strength between the AL film (third layer) and the extruded laminate resin layer (fourth layer) was measured. The results are shown in Table 1 together with the ozone treatment conditions, contents, and aging conditions.

PET
Polyethylene terephthalate film (trade name “Easily Adhesive PET Espet T4102” manufactured by Toyobo).
Extruded PE
High-pressure low-density polyethylene (trade name “L729 LDPE polyethylene” manufactured by Sumitomo Chemical).
AL
Aluminum film (trade name “General Soft Foil” made by Toyo Aluminum).
PE
Linear low-density polyethylene film (trade name “TUX-FCS” manufactured by Tosero).
Coloring agent (hair dye)
Only one of the product names “Beauteen Hair Color” manufactured by Hoyu Co., Ltd. (Butteen Hair Color (N) CC1 Agent / Butteen Hair Color (N) 2 Agent = 40 g / 80 ml) was used. The said 1 agent contains resorcinol as phenols, and ammonia as an alkaline compound.
Adhesive strength (g / 15mm)
The adhesive strength was evaluated from the peel strength when a 15 mm wide laminated film was peeled 180 degrees at a tensile rate of 300 mm / min using an autograph 100A type tensile tester manufactured by Shimadzu Corporation. N = 5, and the average value was defined as the adhesive strength.

[Examples 4-6, Comparative Examples 4-6]
A predetermined amount of a dry laminate adhesive solution was applied to the PET film, the solvent was removed, and then the AL film was laminated and pressure-bonded to obtain a laminate having a layer configuration of AL / Ad / PET.
The laminate was attached to a main feeding device of an extrusion laminator, and this laminate was fed out as one substrate, and a PE / Ny / PE three-layer laminate film was attached to the same device as another substrate. Polyethylene (extruded PE) is melt extruded using a 90 mm diameter extruder equipped with a T-die to form a molten film (resin temperature 320 ° C., film take-off speed 100 m / min, film width 700 to 1000 mm, film thickness 15 μm) By sandwiching and pressing between the laminate and the three-layer laminate film, a laminate having the layer structure shown in Table 2 below from the first layer (outermost layer) to the seventh layer (innermost layer) is obtained. It was. Note that the pressure-bonding between the molten film constituting the fourth layer and the AL film was performed after a predetermined amount of ozone-containing air was blown onto the molten film from a nozzle provided under the T-die.
Furthermore, a packaging bag having a port portion was formed using the obtained laminate (port portion seal conditions: 170 to 220 ° C. × 0.3 to 0.5 MPa × 1 to 6 seconds), and shown in Table 2. A predetermined content was filled and aged for a predetermined time. After aging, a part of the laminate was cut out as a specimen, and the interlayer adhesion strength between the AL film (third layer) and the extruded laminated resin layer (fourth layer) was measured. The results are shown in Table 2 together with the ozone treatment conditions, contents and aging conditions.
When the microscope was observed about the heat seal part of a port part and a laminated body, damage (stress crack) was not observed by the laminated body side in any case.

PET
Polyethylene terephthalate film (trade name “Easily Adhesive PET Espet T4102” manufactured by Toyobo).
Ad
A dry laminate adhesive solution (trade name “Takelac TR A910 / A12” manufactured by Mitsui Takeda Chemical Co., Ltd., solid content concentration 25%, solvent ethyl acetate) was applied to a PET film with a coating thickness of 3 μm after removal of the solvent. Adhesive layer formed by pressure-bonding with AL film after removal.
AL
Aluminum film (trade name “General Soft Foil” made by Toyo Aluminum).
Extruded PE
High-pressure low-density polyethylene (trade name “L729 LDPE polyethylene” manufactured by Sumitomo Chemical).
PE / Ny / PE three-layer laminate film forming the 5th to 7th layers Trade name “DIAMIRON MF” manufactured by Mitsubishi Plastics
Coloring agent (hair dye)
Only one of the product names “Beauteen Hair Color” manufactured by Hoyu Co., Ltd. (Butteen Hair Color (N) CC1 Agent / Butteen Hair Color (N) 2 Agent = 40 g / 80 ml) was used. The said 1 agent contains resorcinol as phenols, and ammonia as an alkaline compound.
Adhesive strength (g / 15mm)
The adhesive strength was evaluated from the peel strength when a 15 mm wide laminated film was peeled 180 degrees at a tensile rate of 300 mm / min using an autograph 100A type tensile tester manufactured by Shimadzu Corporation. N = 5, and the average value was defined as the adhesive strength.

Claims (12)

  A packaging body characterized in that an alkaline content containing phenols is stored in a packaging bag made of a laminated body including a laminated structure in which a resin layer and a metal foil layer are directly laminated.   A packaging body characterized in that alkaline contents are housed in a packaging bag made of a laminate including a laminated structure in which a phenolic-containing resin layer and a metal foil layer are directly laminated.   The package according to claim 1 or 2, wherein the resin layer is an extruded laminate resin layer.   The surface of the resin layer facing the metal foil layer is subjected to surface activation treatment by any one or combination of ozone treatment, corona treatment, and oxidation treatment by resin temperature. Packaging.   The package according to any one of claims 1 to 4, wherein the contents further contain a surfactant.   The package according to any one of claims 1 to 5, wherein the content is a hair dye. A method for producing a laminate including a metal foil layer and an extruded laminate resin layer laminated so as to face at least one side of the metal foil layer, and the following steps (1) to (3):
(1) Step: A step of melt-extruding an extruded laminate resin into a film and subjecting at least one surface to a surface activation treatment,
(2) Step: A step of laminating a metal foil layer on the surface activation treatment surface of the extruded laminate resin obtained in the step (1) to form a laminated interface between the metal foil layer and the extruded laminate resin layer,
(3) Step: A step of causing phenols to act on the laminated interface formed in the step (2) under alkaline conditions.
The manufacturing method of the laminated body characterized by including.   The manufacturing method according to claim 7, wherein the surface activation treatment is any one or a combination of ozone treatment, corona treatment, and oxidation treatment by resin temperature.   The step (3) is a step in which the laminated interface is subjected to the action of phenols under alkaline conditions by phenols and an alkaline compound that diffuse in the extruded laminated resin layer and reach the laminated interface. Or the manufacturing method of 8.   In the step (3), the laminate interface is subjected to an alkaline condition by the phenols preliminarily blended in the extruded laminate resin layer and the alkaline compound that diffuses in the extruded laminate resin layer and reaches the laminate interface. The production method according to claim 7 or 8, which is a step of receiving an action of phenols.   The manufacturing method according to any one of claims 7 to 10, wherein the step (3) is a step performed under a temperature condition of 40 ° C or higher. A packaging bag formed of a laminate obtained by the production method according to claim 7.