JPH11226997A - In-mold labeling molded container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-shielding property and a barrier property against oxygen, water vapor and the like, and furthermore, to fill and package milk and dairy products in a molded container, and to comply with a ministerial ordinance on milk and dairy product component specifications. An object of the present invention is to provide an in-mold labeling molded container that conforms to sanitary standards (abbreviation, ministerial ordinance for milk, etc.). SOLUTION: This is an injection molded container made of thermoplastic resin formed by in-mold molding, wherein an innermost layer and an outermost layer are formed of the same layer on an outer wall surface of a body portion of the container. And a resin film layer having
The side label on which the conductive base material layer is laminated is tightly adhered, and the innermost layer and the outermost layer are made of the same layer on the bottom inner wall surface of the container. The present invention relates to an in-mold labeling-molded container characterized in that a bottom label on which a resin film layer and a barrier base material layer are laminated is closely adhered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-mold labeling container, and more particularly, to a container having excellent barrier properties against oxygen, water vapor and the like, further having a light-shielding property, and mainly for milk and dairy products. The present invention relates to an in-mold labeling molded container suitable for filling and packaging.

[0002]

2. Description of the Related Art Conventionally, various types of in-mold labeling containers have been developed and proposed. This in-mold labeling container is
A packaging container formed by a molding method in which a plastic is molded and a label is simultaneously attached to the surface of a molded product in a mold. Examples of such containers include injection molding, blow molding, and thermoforming molding. It can be manufactured by a molding method.

[0003]

DISCLOSURE OF THE INVENTION The present inventor has made various studies on an in-mold labeling container, and has previously proposed an in-mold label container and a method for producing the same. (See JP-A-8-134277). As a result of various studies on the above-mentioned in-mold label container and its manufacturing method, the inventor of the present invention has used an additive-free polyethylene resin as an in-mold molding resin, and injection-molded the polyethylene resin to form an injection-molded container. Along with manufacturing, the innermost layer and the outermost layer are made of the same layer on the entire surface of the body outer wall surface and the bottom inner wall surface of the molded container, and further, at least between the layers, a resin film layer having strength, and A side label and a bottom label on which a barrier-type base material layer is laminated are closely adhered to produce an in-mold labeling molded container, and the molded container is filled with milk and dairy products. It has excellent barrier properties against oxygen and water vapor, etc., has the preservation suitability of contents, and furthermore, hygiene standards of a ministerial ordinance on milk and dairy product component standards (abbreviation, ministerial order for milk etc.)
The present invention has been completed by finding that a packaging container conforming to the above can be manufactured.

That is, the present invention relates to an injection molded container made of thermoplastic resin, which is formed by in-mold molding, wherein the innermost layer and the outermost layer are formed of the same layer on the outer wall surface of the trunk portion of the container. At least, the side label on which the resin film layer having strength and the barrier-substrate layer are laminated is tightly adhered, and the innermost layer and the outermost layer are of the same quality on the bottom inner wall surface of the container. Inmold labeling molding, comprising a bottom layer and a bottom label on which at least a resin film layer having strength and a barrier-substrate layer are laminated between the layers. It concerns a container.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. First, a method for forming an in-mold labeling molded container according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory view illustrating an example of a method for forming an in-mold labeling molded container according to the present invention. FIGS. 2 and 3 are schematic illustrations for explaining a method of forming the bottom portion in the method of forming the in-mold labeling container according to the present invention shown in FIG.

As shown in FIG. 1, a method for forming an in-mold labeling container according to the present invention comprises a core mold 1, a cavity mold 2, a runner 3, a gate port 4, and the above-described core mold. An injection molding die A including a vacuum suction device 5a attached to the mold 1 and vacuum suction devices 5b, 5b attached to the cavity-die 2 is used. First, the innermost layer and the outermost layer have the same quality. consists, furthermore, between the layers, at least, a resin film layer having a strength, and barrier - a side label R ₁ in which the substrate layer are laminated, corresponds to the entire surface of the body portion outside wall face of the molded container position A vacuum suction device 5 is provided on the inner wall surface of the cavity-mold 2 so that the vacuum suction device 5
b, 5b or the like, and attached while fixing by vacuum suction. Similarly, the innermost layer and the outermost layer are made of the same layer, and further, between the layers, at least a resin film layer having strength, and barrier - resistance and the substrate layer a bottom label R ₂ which is laminated on the surface of the portion corresponding to the bottom of the core mold 1, fitted with fixed by vacuum suction using a vacuum suction device 5a Then, the core mold 1 is fixed to the cavity mold 2, and thereafter, the cavity mold 2 is fixed.
Into the space formed by the core mold 1 and the core mold 1, a polyethylene resin 6 without additives added by a heating cylinder (not shown) is injected from the gate port 4 through the runner 3, and The container 7 conforming to the shape of the space is formed, and the side surface label R ₁ and the bottom surface label R ₂ are melted and integrated on the entire surface of the outer wall surface of the trunk and the entire surface of the bottom inner wall surface of the container. Then, the molded article is taken out by tightly adhering, then cooled and solidified, and the in-mold labeling molded container according to the present invention can be manufactured.

In the above molding method, the molding method of the portion corresponding to the bottom of the in-mold labeling molding container according to the present invention will be described in more detail. First, as shown in FIG. 2, as shown in FIG. Thus, the additive-free polyethylene resin 6 melted by the heating cylinder (not shown) is passed through the runner 3 into the space 10 formed by the core mold 1 and the cavity mold 2. -Exit 4
When emitted from a polyethylene-based resin 6 of additives without addition melted issued the injection is an arrow Y, as shown in Y, and collide with the surface of the underside label R _2, and Thus, the bottom label R ₂
The melted additive-free polyethylene resin 6 colliding with the surface of the core mold 1 is further extruded left and right, and the bottom label R ₂ is pressed against the surface of the core mold ₁ as shown by an arrow Y _1. A heating cylinder (not shown)
When the melted additive-free polyethylene resin 6 is continuously injected from the gate port 4 through the runner 3, as shown in FIG. As shown in Y ₂ and Y ₂ , the bottom label R
Is injected onto the _second surface, it washed away the bottom surface label R ₂ in the left and right with pressed against the surface of the core mold 1, in the end, the entire surface on the bottom label of the bottom inner wall surface of the bottom portion constituting the container 7 the R ₂ in intimate wear melted integrated take out the molded article and thereafter cooled and solidified, Inmo according to the present invention - is capable of producing a field labeling molded container. In the drawing, 5a represents a vacuum suction device, and as described above, a heating cylinder (not shown)
When the additive-free polyethylene resin 6 is injected from the gate port 4 through the runner 3, the vacuum suction mechanism is released.

Next, in the present invention, the configuration of the in-mold labeling molded container according to the present invention formed by the above-mentioned molding method will be described. FIG. 4 shows the in-mold labeling molded container according to the present invention. FIG. 5 is a schematic sectional view showing a part of a bottom label formed in another form at the bottom of the in-mold labeling molded container shown in FIG. 4, and FIG. , FIG.
It is a schematic sectional drawing which shows the state of the junction part of the label of the side label in the trunk | drum outer wall surface of the in-mold labeling molded container shown in FIG.

As shown in FIG. 4, an in-mold labeling-molded container 20 according to the present invention is an injection-molded polyethylene-made resin-made container 2 made of an additive-free polyethylene resin.
1, the innermost layer and the outermost layer are formed of the same layer on the entire surface of the outer wall of the trunk of the container 21, and further, between the layers,
At least, the resin film layer having a strength, and barrier - substrate and brought into close contact wear side label R ₁ which are stacked, also on the entire surface of the bottom inner wall surface of the container 21, and the innermost layer and the outermost layer It consists of homogeneous layers, and between layers,
At least, the resin film layer having a strength, and barrier - and the base material is made of configurations obtained by intimately dressed underside label R ₂ are stacked. Further, according to the present invention Inmo - field Labeling molded container 20, as shown in FIG. 5, the portion of the bottom portion, the bottom label R ₂ is closely worn on the bottom inner wall surface of the container 21, from the bottom of the container 21 It is also possible to take a form in which the portion of the inner wall surface that rises and forms the body of the container 21 is folded inward. Further, the in-mold labeling molded container 20 according to the present invention has a side surface label R on an outer wall surface thereof.
₁ of the joint portion, as shown in FIG. 6, the end faces 22 and 22 of the side label R ₁ is one it is preferable that the bonding in the form of mutual surface contact, and further, although not shown, the The end faces 22, 22 may be joined to each other in a slightly overlapping form. Incidentally, according Inmo the present invention - the bottom label R ₂ is closely worn on the inside wall surface of the bottom portion of the shield labeling molded container has, at its central portion, the runner - through the gate - molten molding resin is injected from the preparative port No holes are punched out.

The above-mentioned exemplification shows an example of the in-mold labeling-molded container according to the present invention and an example of a method of molding the same. The present invention is not limited to this, and is not shown. The shape of the container may be any shape such as a round shape, a square shape, and others. Thus, the in-mold labeling molded container according to the present invention is filled with milk or dairy product from the opening thereof, and then the opening is sealed with a lid material. A milk packaged product comprising a labeling molded container can be manufactured.

In the above, it is preferable that the inner surface layer of the lid material is a material that conforms to the hygiene standards (abbreviation, ministerial order for milk, etc.) of the ministerial ordinance concerning the above-mentioned component standards of milk and dairy products. That is, the inner surface layer is formed of a film or sheet of various polyethylene resins such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear (linear) low-density polyethylene, and the like, as described later. It is preferred to be composed of Further, it is preferable that the above-mentioned lid member also be made of a material having a property of blocking light such as sunlight or a property of not transmitting water vapor, water, gas and the like, as described later. The base material may be used, or a composite base material obtained by combining two or more kinds of base materials may be used. Specifically, for example,
Aluminum foil having a light-shielding property and a barrier property, a resin film having a vapor-deposited film thereof, a resin film having a barrier property, a vapor-deposited film of an inorganic oxide such as silicon oxide and aluminum oxide, a barrier against water vapor, water, etc. Low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, a film or sheet of a resin such as an ethylene-propylene copolymer, a polyester resin having a gas barrier property, Polycarbonate resin, nylon resin (polyamide resin), acrylonitrile resin, polyvinyl alcohol, saponified ethylene-vinyl acetate copolymer, etc. A colorant such as a pigment is kneaded with other desired additives to form a film. Film or sheet of various colored resins having a light-shielding property - can be used bets like. The thickness of the above-mentioned film or sheet is arbitrary, but is usually about 5 μm to 300 μm, and more preferably about 10 μm.
m to 100 μm is desirable. Further, in the above, an aluminum foil having a thickness of about 5 μm to 30 μm, and an aluminum or inorganic oxide deposited film having a thickness of about 100 to 2000 mm can be used. Further, in the above-mentioned lid material, as a substrate film having a basic function as a lid material, for example, polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate A tough resin film or sheet such as a resin, a polyacetal resin, a fluorine resin, or the like, or various paper substrates can be used. As the resin film or sheet, any of an unstretched film and a stretched film stretched in a uniaxial or biaxial direction can be used. In the present invention, the lid material can be manufactured by using the above-mentioned materials and utilizing a laminating method described later.

Next, in the present invention, the above-described in-mold labeling-formed container according to the present invention and the materials used in the molding method thereof will be described.
First, in the present invention, as the in-mold molding resin constituting the in-mold labeling molding container according to the present invention, for example, high-density polyethylene, medium-density polyethylene, low-density polyethylene, various types of polyethylene for molding such as Resins can be used. Therefore, in the present invention, the above-mentioned molding is performed in order to fill milk and dairy products for filling and packaging, and to comply with the hygiene standards (abbreviation, ministerial order for milk etc.) of ministerial ordinances concerning milk and dairy product component standards. It is desirable that no additives be added to the polyethylene resin for use. However, as an exception, 2.5 g of calcium stearate approved by the above ministerial ordinance for milk etc.
/ Kg or less, or 0.3 kg of glycerin fatty ester
It is possible to use less than / Kg. Further, in the present invention, in order to satisfy the function as a packaging container, strength and the like, among the above-mentioned polyethylene resins for molding, particularly, a high-density polyethylene resin without additives is used. Is most preferred.

Next, in the present invention, the innermost layer and the outermost layer are made of the same layer, and at least
A resin film layer having strength, and a side label on which a barrier-based substrate layer is laminated, first, as a material constituting the innermost layer and the outermost layer, for example, high-density polyethylene, medium-density polyethylene Films or sheets of various resins such as low-density polyethylene, linear (linear) low-density polyethylene, and other various polyethylene resins, polypropylene resins, polyester resins, polyamide resins, and others; Alternatively, various co-extruded films or sheets obtained by using the various resins described above and co-extruding them can be used. As the film or sheet as described above, an unstretched or stretched film or sheet stretched in a uniaxial or biaxial direction can be used, and the thickness thereof is about 6 to 100 μm, preferably It is desirable to use a material having a thickness in the range of about 12 to 50 μm. Thus, in the present invention, by forming the innermost layer and the outermost layer using the same material as described above, it is possible to prevent the curling of the label when the label is manufactured. It is the purpose. Furthermore, in the above, as the material constituting the innermost layer, when the polyethylene resin for molding constituting the above container is injected and extruded and comes into contact with the label, it has heat sealability and the like,
It is desirable to use materials that have the property of melting and tightly adhering to each other. Further, in the above, the material constituting the outermost layer is to maintain the stiffness, strength, and the like as a label. Specifically, for example, the Young's modulus is 5000 kg / c.
It is desirable to use a material that can provide a stiffness of at least m ² .

In the present invention, the resin film layer having the strength constituting the label may be, for example, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, a polyamide resin, a polyaramid. A film or sheet of a tough resin such as a resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, and the like can be used. Thus, the resin film or sheet as described above has a function of further reinforcing the function of the material constituting the outermost layer, and has, for example, rigidity, mechanical and physical properties. It is desirable to use one having excellent properties in terms of chemical, chemical, etc. As the resin film or sheet, it is desirable to use a stretched film stretched in a biaxial direction. Also,
In the present invention, the thickness of the resin film or sheet may be a thickness that can be held to the minimum necessary for strength, rigidity, and the like. On the contrary, if it is too thin, the strength, rigidity, etc. decrease, which is not preferable. In the present invention, for the reasons described above, about 10 μm to 50 μm
Most preferably, the position is about m, preferably about 12 μm to 30 μm.

Next, in the present invention, as the barrier base material layer constituting the label, a material having a property of blocking light such as sunlight or a property of not transmitting water vapor, water, gas or the like is used. It can be used, and it may be a single substrate or a composite substrate obtained by combining two or more types of substrates. Specifically, for example,
Aluminum foil having a light-shielding property and a barrier property, a resin film having a vapor-deposited film thereof, a resin film having a barrier property, a vapor-deposited film of an inorganic oxide such as silicon oxide and aluminum oxide, a barrier against water vapor, water, etc. Low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, a film or sheet of a resin such as an ethylene-propylene copolymer, a polyester resin having a gas barrier property, Polycarbonate resin, nylon resin (polyamide resin), acrylonitrile resin, polyvinyl alcohol, saponified ethylene-vinyl acetate copolymer, etc. A colorant such as a pigment is kneaded with other desired additives to form a film. Film or sheet of various colored resins having a light-shielding property - can be used bets like. These materials can be used alone or in combination of two or more. The thickness of the above-mentioned film or sheet is arbitrary, but is usually 6 μm to 100 μm.
And more preferably about 7 μm to 30 μm. Further, in the above, the aluminum foil has a thickness of about 5 μm to 30 μm, and the aluminum or inorganic oxide deposited film has a thickness of 300 to 1 μm.
Those of about 000Å can be used. In addition, as the resin film supporting the above-mentioned vapor deposition film, for example,
Polyester films, polyamide films, polyolefin films, polycarbonate films, polyvinyl alcohol films, saponified ethylene-vinyl acetate copolymer films, and the like can be used.

By the way, labels are usually subjected to severe physical and chemical conditions. Therefore, strict conditions are required for the laminated material constituting the labels, and deformation prevention strength, drop impact strength, Pinhole resistance, heat resistance, sealability,
Various conditions such as quality maintainability, workability, hygiene, etc. are required. Therefore, in the present invention, in addition to the above-mentioned materials, other materials satisfying the above-mentioned various conditions are used. Can be used arbitrarily, specifically, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer , Ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid or methacrylic acid copolymer, methylpentene polymer, polybutene resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinylidene chloride Resin, vinyl chloride-vinylidene chloride copolymer, poly (meth) acrylic resin, polyacrylonitrile resin Polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyester resin, polyamide resin, polycarbonate resin, polyvinyl alcohol Resin, saponified ethylene-vinyl acetate copolymer, fluororesin,
It can be arbitrarily selected from known resin films or sheets such as diene resins, polyacetal resins, polyurethane resins, nitrocellulose and others. In addition, for example, a film such as cellophane, synthetic paper, or the like can be used. In the present invention, the above-mentioned film or sheet can be used in any of unstretched and uniaxially or biaxially stretched. The thickness is arbitrary, but is from several μm to 3 μm.
It can be used by selecting from a range of about 00 μm.
Further, in the present invention, the film or sheet may be any film such as an extruded film, an inflation film, or a coating film.

Next, in the present invention, the innermost layer and the outermost layer are composed of the same layer, and at least
A bottom surface label in which a resin film layer having strength and a barrier-substrate layer are laminated will be described. As such a bottom label, the innermost layer, the outermost layer, and the resin film having strength constituting the above-mentioned side label are described. It is possible to use materials such as a layer, a barrier base material layer, and the like. By the way, in the present invention, as described above, since the bottom label is tightly adhered to the bottom inner wall surface of the in-mold labeling molded container according to the present invention, the innermost surface of the bottom label is milk or Because it comes into contact with the contents of dairy products, it is necessary to comply with the hygiene standards of ministerial ordinances for milk and dairy product component standards (abbreviated name, ministerial ordinance of milk etc.). For the innermost layer, it is desirable to use, for example, films or sheets of various polyethylene resins such as high-density polyethylene, medium-density polyethylene, low-density polyethylene and others. In the present invention, a polyethylene resin film as described above is suitable for filling and packaging milk and dairy products and conforming to the hygiene standards of ministerial ordinances concerning milk and dairy product component standards (abbreviation, ministerial ordinance of milk etc.). It is desirable that no additives be added to the sheet. However, as an exception, it is possible to use not more than 2.5 g / Kg of calcium stearate or not more than 0.3 Kg / Kg of glycerin fatty ester, which is approved by the above-mentioned ministerial ordinance of milk. Further, in the present invention, in order to satisfy the function, strength, and the like as a packaging container, it is particularly preferable to use a high-density polyethylene resin for molding without additives. In the present invention, the other layer of the bottom label, that is, the layer on the side in contact with the molding resin (the surface of the outermost layer) is, similarly to the above-mentioned side label, a polyethylene resin for molding which constitutes the above-mentioned container. Has a heat-sealing property when it is ejected, extruded and comes into contact with the label,
It is desirable to use materials that have the property of melting and tightly bonding to each other, and it is desirable to use a material that can maintain the stiffness, strength, and the like as a label as the material forming the outermost layer Things.

Next, in the present invention, a method for producing a laminated material for producing a side label or a bottom label by laminating the above-mentioned materials will be described. Lamine used
For example, an extrusion lamination method, a co-extrusion lamination method, a dry lamination method, a solventless dry lamination method, and the like. Thus,
In the present invention, when performing the above lamination, if necessary, a pretreatment such as a corona treatment, an ozone treatment, and a frame treatment can be performed on the film. -Based (urethane-based), polyethyleneimine-based, polybutadiene-based, organic titanium-based anchors, etc.
Coating agents, or known anchor coating agents such as polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, and other laminating adhesives, etc. Agents and the like can be used.

Incidentally, in the present invention, in the method for producing a laminated material constituting a label as described above, the adhesive extruded resin constituting the adhesive layer upon extrusion lamination may be, for example, polyethylene, ethylene- α-olefin copolymer, copolymer of ethylene and unsaturated carboxylic acid such as polypropylene, polybutene, polyisobutene, polyisobutylene, polybutadiene, polyisoprene, ethylene-methacrylic acid copolymer, or ethylene-acrylic acid copolymer Or modified acid-modified polyolefin resins, ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ionomer resin, ethylene-vinyl acetate copolymer, etc. . In the present invention,
Specific examples of the adhesive constituting the adhesive layer at the time of dry laminating include two-part curable urethane-based adhesives, polyester urethane-based adhesives, and polyether urethane-based adhesives used in dry laminates and the like. An adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, a polyvinyl acetate adhesive, an epoxy adhesive, a rubber adhesive, and the like can be used.

Next, in the present invention, using the laminated material for forming the side label or the bottom label produced by laminating the above-mentioned materials, the entire outer wall surface of the trunk portion of the in-mold labeling molded container, Further, a side label or a bottom label to be closely adhered to the entire surface of the bottom outer wall surface is manufactured. That is, using the laminated material as described above, the side surface for the body outer wall surface which is closely adhered to the entire surface of the body outer wall surface of the inmold labeling container in accordance with the size of the mold labeling container. It is manufactured by stamping out a label and a bottom label for a bottom inner wall surface to be closely adhered to the entire surface of the bottom inner wall surface. In the present invention, the imprint is attached to the bottom label.
At the time of molding, there is no round hole or the like through which the molten resin injected from the gate opening through the runner passes. Thus, in the present invention, the above-described side label for the body outer wall surface and the bottom label for the bottom inner wall surface are mounted in an injection mold using a vacuum suction device or the like, and thereafter, The injection molded resin can be injected to produce the in-mold labeling molded container according to the present invention. The above-mentioned in-mold labeling molded container according to the present invention has a side label and a bottom label tightly adhered to the entire body outer wall surface and bottom inner wall surface of the container, respectively.
Since an opening such as a round hole is not provided at the center of the container, the entire surface of the container is covered with the label including the barrier-type base material layer. Furthermore, it is also excellent in light-shielding properties of sunlight and the like.

[0021]

Next, the present invention will be described in more detail with reference to examples. Example 1 (1). A predetermined printing pattern is printed on one surface of a biaxially oriented polypropylene film having a thickness of 30 μm to form a printing layer, and then a polyurethane-based adhesive having a thickness of 3 g / m ² is formed on the printing layer. (Dried state) to form an adhesive layer, and on the surface of the adhesive layer, a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm was dry-laminated. Next, a polyurethane adhesive is coated on the biaxially stretched polyethylene terephthalate film surface to a thickness of 5 g / m ² (dry state) in the same manner as described above to form an adhesive layer. Then, an aluminum foil having a thickness of 7 μm was dry-laminated on the surface of the adhesive layer. Thereafter, a polyurethane adhesive is coated on the aluminum foil surface to a thickness of 3 g / m ² (dry state) in the same manner as described above to form an adhesive layer. A 30-μm-thick coextruded film of polyethylene and polypropylene on the surface of the layer,
A biaxially stretched co-extruded film having dry properties was dry-laminated to produce a laminated material for forming a side label. Using the above-described laminated material for forming a side label, a side label to be tightly adhered to the entire outer wall surface of the body of the molded container having a predetermined size was punched out. (2). Next, a polyurethane adhesive was applied to the surface of the high-density polyethylene film having a thickness of 100 μm at a thickness of 3 g / m ^2.
(Dried state) to form an adhesive layer, and on the surface of the adhesive layer, a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm was dry-laminated. Next, a polyurethane adhesive is coated on the biaxially stretched polyethylene terephthalate film surface to a thickness of 3 g / m ² (dry state) in the same manner as described above to form an adhesive layer. Then, an aluminum foil having a thickness of 7 μm was dry-laminated on the surface of the adhesive layer. Thereafter, a polyurethane adhesive is coated on the aluminum foil surface to a thickness of 3 g / m ² (dry state) in the same manner as described above to form an adhesive layer. On the layer side,
A high-density polyethylene film having a thickness of 100 μm without additives was dry-laminated to produce a laminate for bottom label formation. Using the laminated material for forming a bottom label described above, a bottom label to be adhered tightly to the bottom inner wall surface of a molded container having a predetermined size was punched out. The bottom label was not provided with a circular hole at the center thereof for injecting resin. (3). Next, the side label manufactured as described above is
The biaxially stretched polypropylene film having sealing properties is mounted on the inner wall surface of the cavity mold while vacuum-suctioning using a vacuum suction device or the like so that the surface of the biaxially stretched polypropylene film is in contact with the molding resin. Label, so that the high-density polyethylene film surface is in contact with the molding resin and the additive-free high-density polyethylene film surface is the innermost surface of the container,
It was mounted on the surface of a portion corresponding to the bottom of the core mold while vacuum suction was applied using a vacuum suction device or the like and fixed. Next, a core mold is fixed to the cavity mold, and thereafter, an additive-free high-density polyethylene melted by a heating cylinder in a space formed by the cavity mold and the core mold. The resin is injected from the gate opening through the runner to form a container in the shape of the space of the above-mentioned mold, and the label is melted and integrated on the outer wall surface of the body and the inner wall surface of the bottom portion constituting the container. The molded article was taken out by tightly adhering and then cooled and solidified to produce an in-mold labeling molded container according to the present invention (see FIG. 1). Milk or dairy product is filled from the opening into the in-mold labeling molded container manufactured as described above, and then the additive-free low-density polyethylene having a heat-sealable inner surface in the opening. A resin film layer, on which an aluminum foil (thickness difference: 7 μm) is laminated as a barrier substrate, and a biaxially oriented polyethylene terephthalate film having a thickness of 12 μm is further formed as a substrate film. A milk packaged product was manufactured by sealing with a lid material laminated. The packaging container constituting the above milk packaged product was excellent in light-shielding properties, and was also excellent in oxygen permeability, moisture permeability, and the like.

Embodiment 2 (1). A predetermined printing pattern is printed on one surface of a high-density polyethylene film having a thickness of 40 μm to form a printing layer, and then a polyurethane-based adhesive having a thickness of 3 g / m ² ( (Dry state) to form an adhesive layer, and on the surface of the adhesive layer, a biaxially oriented polyethylene terephthalate film having a thickness of 12 μm was dry-laminated. Next, a polyurethane adhesive is coated on the biaxially stretched polyethylene terephthalate film surface to a thickness of 3 g / m ² (dry state) in the same manner as described above to form an adhesive layer. Then, an aluminum foil having a thickness of 7 μm was dry-laminated on the surface of the adhesive layer. Thereafter, a polyurethane adhesive is coated on the aluminum foil surface to a thickness of 3 g / m ² (dry state) in the same manner as described above to form an adhesive layer. On the surface of the layer, a high-density polyethylene film having a thickness of 40 μm and having heat sealability was dry-laminated to produce a laminated material for forming a side label. Using the above-described laminated material for forming a side label, a side label to be closely adhered to the outer wall surface of the body of a molded container having a predetermined size was punched out. (2). A polyurethane-based adhesive is coated to a thickness of 3 g / m ² (dry state) on the surface of the high-density polyethylene film having a thickness of 40 μm to form an adhesive layer. A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm was dry-laminated. next,
On the biaxially stretched polyethylene terephthalate film surface, a polyurethane-based adhesive having a thickness of 3 g /
m ² (dry state) to form an adhesive layer, and a 12 μm-thick biaxially stretched polyethylene terephthalate having a silicon oxide deposited film on the surface of the adhesive layer.
The dry film was dry-laminated with its silicon oxide vapor-deposited film faces each other. Thereafter, a polyurethane adhesive is coated on the biaxially stretched polyethylene terephthalate film surface to a thickness of 3 g / m ² (dry state) in the same manner as above to form an adhesive layer. Further, a high-density polyethylene film having a thickness of 40 μm and having no heat-sealing property was dry-laminated on the surface of the adhesive layer to produce a laminate for forming a bottom label.
Using the above-mentioned bottom label forming laminate, a bottom label to be tightly adhered to the bottom inner wall surface of a molding container having a predetermined size was punched out. The bottom label was not provided with a round hole at the center for injecting and injecting resin. (3). Next, using the above-mentioned side label and bottom face label, in the same manner as in Example 1 described above, the molded label was molded to produce the molded label of the present invention. Fill the in-mold labeling molded container produced above with milk or dairy products from the opening,
Thereafter, an inner surface of the opening is formed of a heat-sealing resin film layer, and an aluminum foil (thickness difference: 7 μm) is laminated thereon as a barrier-type base material. As a film, a 12-μm-thick biaxially stretched polyethylene terephthalate film was hermetically sealed with a lid material to produce a milk packaged product. The packaging container constituting the above milk packaged product was excellent in light-shielding properties, and was also excellent in oxygen permeability, moisture permeability, and the like.

[0023]

As is apparent from the above description, according to the present invention, a polyethylene resin without additives is used as an in-mold molding resin, and this is injection-molded to produce an injection-molded container. The innermost layer and the outermost layer are made of the same layer on the body outer wall surface and the bottom inner wall surface of the molded container, and further, at least between the layers, a resin film layer having strength, and a barrier-based substrate. The side label and the bottom label on which are laminated are tightly adhered to each other to produce an in-mold labeling molded container, and the molded container is filled with milk and dairy products to provide light-shielding properties and oxygen, water vapor, etc. It is possible to produce a packaging container which has excellent barrier properties and has a storage suitability for contents, and which further conforms to the hygiene standards (abbreviation, ministerial ordinance for milk, etc.) of ministerial ordinances on milk and dairy product component standards. Is that that.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view illustrating an example of a method for forming an in-mold labeling container according to the present invention.

FIG. 2 is a schematic explanatory view illustrating a method of forming a bottom portion in the method of forming the in-mold labeling-formed container according to the present invention shown in FIG.

FIG. 3 is a schematic explanatory view for explaining a method of forming a bottom portion in the method of forming the in-mold labeling container according to the present invention shown in FIG.

FIG. 4 is a schematic sectional view showing a configuration of an in-mold labeling molded container according to the present invention.

FIG. 5 is a schematic cross-sectional view showing a part of a bottom label having another form at the bottom of the in-mold labeling molded container shown in FIG. 4;

6 is a schematic cross-sectional view showing a part of a state of a joining portion of a side label on a body outer wall surface of the in-mold labeling molded container shown in FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Core mold 2 Cavity mold 3 Runner 4 Gate port 5a Vacuum suction device 5b Vacuum suction device 6 Melted additive-free polyethylene resin 7 Container 10 Space portion 20 In-mold labeling molding container 21 Addition things polyethylene resin injection molded container 22 end surface a injection mold R ₁ side label R ₂ bottom label of the label without additives Y arrow Y ₁ arrow Y ₂ arrows

Claims (7)

[Claims] 1. An injection molded container made of thermoplastic resin which is formed by in-mold molding, wherein an innermost layer and an outermost layer are formed of the same layer on an outer wall surface of a body portion of the container. Resin film layer having strength and barrier
The side label on which the conductive base material layer is laminated is tightly adhered, and the innermost layer and the outermost layer are made of the same layer on the bottom inner wall surface of the container. An in-mold labeling-molded container, characterized in that a bottom label on which a resin film layer and a barrier substrate layer are laminated is tightly adhered. 2. An in-mold labeling-molded container according to claim 1, wherein the thermoplastic resin-made injection-molded container is made of an additive-free polyethylene molded resin. 3. The in-mold labeling according to claim 1, wherein the innermost layer and the outermost layer constituting the side label are formed of a biaxially stretched polypropylene resin film layer or a polyethylene resin film layer. Molded container. 4. The in-mold labeling according to claim 1, wherein the innermost layer and the outermost layer constituting the bottom label are made of a polyethylene resin film layer containing no additives. Molded container. 5. A resin film layer having strength constituting side and bottom labels, comprising a biaxially stretched polyethylene terephthalate film layer, a biaxially stretched polyamide film layer, or a biaxially stretched polypropylene film layer. The above-mentioned claim 1, 2, 3 or 4 characterized by the above-mentioned.
4. An in-mold labeling molded container as described in the above item. 6. The in-mold labeling according to claim 1, wherein the barrier base layer constituting the side label and the bottom label is made of aluminum foil. Molded container. 7. The immobilizer according to claim 1, wherein the label is closely adhered to the entire outer wall surface and the inner wall surface of the bottom of the container. -Redo labeling molded containers.