WO2015141789A1

WO2015141789A1 - In-mold label container

Info

Publication number: WO2015141789A1
Application number: PCT/JP2015/058284
Authority: WO
Inventors: 亀田　克巳; 満武士田; 加戸　卓; 恒相澤
Original assignee: 大日本印刷株式会社
Priority date: 2014-03-19
Filing date: 2015-03-19
Publication date: 2015-09-24
Also published as: AU2015232363B2; CN106132841A; AU2015232363A1; JP6358495B2; KR20160135268A; CN106132841B; KR102179800B1; JP2015178378A

Abstract

　The present invention addresses the problem of providing an in-mold label container having excellent gas barrier and oxygen absorption properties. The in-mold label container (10) is provided with a barrel section (11) and a bottom section (1). The in-mold label container (10) has a sheet-formed body (3), a label (4), and an injection resin (8) interposed between the sheet-formed body (3) and the label (4). The sheet-formed body (3) has the shape of the container while exhibiting gas barrier properties, and is positioned on the inner side. The label (4) exhibits gas barrier properties and is positioned on the outer side. A laminate (23) of the sheet formed body (3) has a gas barrier/oxygen-absorbing resin layer (23b). This makes it possible to obtain reliable gas barrier properties, even if a gap is formed at the end edge of the label (4), and to absorb oxygen that has infiltrated into the interior.

Description

In-mold label container

The present invention relates to an in-mold label container that can obtain a reliable gas barrier property.

An in-mold label container is obtained by setting a label having a heat seal layer on a mold in advance during injection molding and fusing the heat seal layer of the label to the injection resin surface with the heat of the resin during molding. .

As an in-mold label container using a gas barrier label, an in-mold label container having a body part and a bottom part is known. In such an in-mold label container, a label having a strong waist and a high gas barrier property is fixed to the trunk portion and the bottom portion as an insert material. Thereby, the in-mold label container which has the barrier property which raised the mechanical strength of the whole container with the strength of the waist of a label can be provided. Here, a label in which a main body layer made of strong paper or synthetic paper and a barrier layer made of a synthetic resin material having a gas barrier property are used as the label.

However, in the conventional in-mold label container, the label is particularly fixed to the body part, but a gap is formed between the edge of the label of the body part. For this reason, there is a problem that the gas barrier property is lowered by the gap between the edges of the label.

In order to solve such a problem, it is considered to provide a sheet molded body having a container shape having a gas barrier property inside the in-mold label container. In this case, if the sheet molded body can absorb oxygen, the sheet molded body can absorb oxygen mixed in the in-mold label container, and the contents can be prevented from being altered. .

JP-A-8-132477

The present invention has been made in consideration of such points, and even if a gap is formed between the edges of the body label, a reliable gas barrier property can be obtained, and oxygen mixed in the inside can be absorbed. It is an object of the present invention to provide an in-mold label container that can be used.

The present invention relates to an in-mold label container having a body part and a bottom part, and includes a body sheet and a bottom sheet, and has a container shape, a sheet molded body having a gas barrier property, and a label having a gas barrier property. An injection resin interposed between the sheet molded body and the label, the sheet molded body is positioned inside the injection resin, the label is positioned outside the injection resin, and the sheet molded body is gas barrier property and oxygen An in-mold label container comprising an absorbent gas barrier / oxygen-absorbing resin layer.

The present invention is the in-mold label container, wherein the gas barrier / oxygen absorbing resin layer has a gas barrier resin layer containing an oxygen absorbent.

The present invention is an in-mold label container, wherein the gas barrier / oxygen absorbing resin layer has a gas barrier resin layer and an oxygen absorbing resin layer containing an oxygen absorbent.

The present invention is an in-mold label container wherein the gas barrier resin layer has an EVOH layer.

The present invention is an in-mold label container characterized in that the oxygen absorbent has an organic compound having oxygen absorbability.

The present invention is an in-mold label container characterized in that the oxygen absorbent has a reducible metal powder.

As described above, according to the present invention, the gas barrier property of the in-mold label container can be improved even when a gap is formed between the edges of the body part label, and the oxygen mixed in the inside can be appropriately used. Absorption can prevent the contents from being altered.

FIG. 1 is a side sectional view showing an in-mold label container according to an embodiment of the present invention. FIG. 2 is a plan view showing an in-mold label container. FIG. 3 is a perspective view showing an in-mold label container. FIG. 4 is a perspective view showing a sheet molded body. FIG. 5 is a plan view showing a sheet molded body. FIG. 6 is a side sectional view showing a laminated structure of a sheet molded body. FIG. 7A is an exploded view showing a label having a body label and a bottom label, and FIG. 7B is an assembly view showing the body label and the bottom label. FIG. 8 is a side sectional view showing a laminated structure of labels. 9A, 9B, and 9C are views showing a method for manufacturing an in-mold label container. FIG. 10 is a side sectional view showing a modified example of the laminated structure of the sheet molded body.

<Embodiment>
Embodiments of the present invention will be described below with reference to the drawings.

1 to 9 are diagrams showing an embodiment of the present invention.

As shown in FIGS. 1 to 3, the in-mold label container 10 includes a substantially hexagonal cylindrical body portion 11 having a flange portion 14, and a bottom portion 12 connected to the lower portion of the body portion 11.

The in-mold label container 10 includes a sheet molded body 3 having a gas barrier property, a label 4 having a gas barrier property, and an injection resin 8 interposed between the sheet molded body 3 and the label 4. .

Among them, the sheet molded body 3 is located on the inner side of the injection resin 8, that is, on the inner surface side of the in-mold label container 10, and the body sheet 3a corresponding to the body part 11, the bottom sheet 3b corresponding to the bottom part 12, and the flange part. 14 has a container shape including a flange portion sheet 3c corresponding to 14, and has a gas barrier property as a whole (see FIGS. 4 to 6).

The label 4 is located outside the injection resin 8, that is, on the outer surface side of the in-mold label container 10, and includes a body label 5 corresponding to the body 11 and a bottom label 7 corresponding to the bottom 12. It has sex. A gate hole 7a for injecting the injection resin 8 is formed in the center of the bottom label 7 (see FIGS. 7 to 8). The gas barrier property here has at least an oxygen barrier property, but may have a water vapor barrier.

As shown in FIGS. 7A and 7B, the body label 5 and the bottom label 7 constituting the label 4 are integrally formed. The body label 5 has a plurality of

portions

5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h that extend outward from the periphery of the bottom label 7.

Further, between the

respective portions

5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h of the body label 5, the

respective portions

5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h are overlapped with each other so as to overlap each other. Is forming.

As described above, since the body label 5 and the bottom label 7 both include a layer having gas barrier properties, the label 4 having the body label 5 and the bottom label 7 has high gas barrier properties.

In this case, the body portion label 5 forms the overlapping portion 5A by overlapping the

portions

5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h. For this reason, no gap is formed between the

portions

5a, 5b, 5c, 5d, 5e, 5f, 5g, and 5h of the body label 5, thereby improving the gas barrier property of the in-mold label container 10 as a whole. Can be made.

By the way, as shown in FIGS. 1 to 3, the body portion 11 of the in-mold label container 10 has a flange portion 14. And this flange part 14 has the flange part sheet | seat 3c provided in the trunk | drum sheet | seat 3a upper end of the sheet molded object 3, and the injection resin 8 inject | poured on this flange part sheet | seat 3c.

In the in-mold label container 10 having such a configuration, the liquid content 35 is filled. Next, the lid member 30 composed of the aluminum layer 30a and the heat seal layer 30b is adhered to the flange portion 14 of the in-mold label container 10, and the in-mold label container 10 is sealed.

Next, the sheet molded body 3 will be described with reference to FIGS.

The sheet molded body 3 includes the trunk portion sheet 3a having the flange portion sheet 3c and the bottom portion sheet 3b as described above, and has a container shape. In this case, the sheet molded body 3 is composed of a sheet-like laminate 23 having a layer configuration as shown in FIG.

That is, as shown in FIG. 6, the laminate 23 constituting the sheet molded body 3 is composed of a polypropylene layer (PP) 23 a as a synthetic resin layer sequentially disposed from the outside, and ethylene vinyl alcohol having gas barrier properties and oxygen absorbing properties. It has a gas barrier / oxygen-absorbing resin layer 23b including a copolymer layer (EVOH) and a polypropylene layer (PP) 23c as an adhesive layer.

And the sheet molded body 3 having a container shape can be obtained by subjecting the sheet-shaped laminated body 23 thus configured to vacuum forming.

Next, the sheet molded body 3 will be further described. Of the laminate 23 constituting the sheet molded body 3, the gas barrier / oxygen absorbing resin layer 23 b is composed of a single EVOH layer (gas barrier resin layer) containing the contained oxygen absorbent, and has gas barrier properties and oxygen absorbing properties. Have.

Among these, the oxygen absorbent contained in the EVOH layer is not particularly limited as long as the material can absorb oxygen. Examples of the oxygen absorber include a compound having a carbon-carbon double bond, a polymer having a secondary or tertiary carbon atom, or an organic compound such as a polyamide resin; or reducible iron or reducible zinc A reducible metal powder may be used.

Examples of compounds having a carbon-carbon double bond are polybutadiene, polyisoprene, polychloroprene, poly (2-ethylbutadiene), poly (2-butylbutadiene) and any other polydiene, mainly 1,4 Respectively obtained by polymerization of monomer molecules in the -position (such as 1,4-polybutadiene); ring-opening metathesis polymers of any cycloolefin (such as polyoctenylene, polypentenylene, and polynorbornene); and styrene-isoprene-styrene tri The block copolymer which has each polydiene block, such as a block copolymer, is mentioned. Of these examples, polybutadiene and polyoctenylene are preferred.

When the oxygen absorbent is an organic compound in particular, it is possible to improve the oxygen absorption performance of the oxygen-absorbing resin layer by incorporating one or more transition metal salts into the layer.

Examples of transition metal salts include iron salts, nickel salts, copper salts, manganese salts, cobalt salts, rhodium salts, titanium salts, chromium salts, vanadium salts, and ruthenium salts. However, the metal salt is not limited thereto. Of these salts, iron salts, nickel salts, copper salts, manganese salts, and cobalt salts are preferred, manganese salts and cobalt salts are more preferred, and cobalt salts are even more preferred.

Next, the label 4 including the body part label 5 and the bottom part label 7 will be described below.

The label 4 having the body label 5 and the bottom label 7 is composed of a laminate 24 having a layer structure as shown in FIG.

That is, as shown in FIG. 8, the label 4 having the body part label 5 and the bottom part label 7 includes (i) an adhesive layer 24a for injection resin, (ii) a soot synthetic resin layer 24d, and (iii) a gas barrier layer 24c. And (iv) the printing substrate layer 24b (here, the layer (i) and the layer (ii) can be used together). Each of these

layers

24a, 24b, 24c, and 24d is independently formed into a film and bonded (dry lamination) via an adhesive, or a part or all of the layers are melt-extruded (EC, co-extruded). It can also be formed. Moreover, a printing base material layer can also be abbreviate | omitted according to a use and the objective.

The adhesive layer 24a is not particularly limited as long as it adheres to the injection resin. Usually, the adhesive layer 24a has an adhesive property such as a plastic made of the same material as the injection resin or polyethylene containing EVA (ethylene / vinyl acetate copolymer). A resin film or a plastic film on which these resins are coextruded or coated can be preferably used.

The film as the printing substrate layer 24b is not particularly limited as long as it is generally printable, and for example, a polyester film, a polypropylene film, a nylon film, or the like can be used as appropriate.

Examples of the gas barrier layer 24c include (a) aluminum foil (7 to 25 μm), (b) a metal or metal oxide laminated on a plastic film by vapor deposition, for example, silicon oxide vapor deposition plastic film, aluminum oxide vapor deposition Plastic film, aluminum vapor-deposited plastic film, (c) other, polyacrylonitrile resin, EVOH (ethylene vinyl alcohol copolymer), PVDC (polyvinylidene chloride) film, PVDC coated biaxially stretched plastic film, etc. It can be appropriately selected according to the performance.

Also, polypropylene (PP) can be used as the synthetic resin layer 24d.

In addition, each said layer is formed in accordance with a conventional method by the dry lamination method, the extrusion lamination method, the extrusion coating method, and other coating methods.

Specifically, as the label 4 having the body part label 5 and the bottom part label 7, for example, a label having the following layer configuration can be used.

(1) Heat seal stretched polypropylene layer (HSOPP) 30μ / aluminum foil 7μ / stretched polypropylene layer (OPP) 30μ
(2) Heat-sealed stretched polypropylene layer (HSOPP) 30μ / VM-PET12 / stretched polypropylene layer (OPP) 30μ
(3) Heat sealant coating / stretched polypropylene layer (OPP) 30 μ / aluminum foil 7 μ / stretched polypropylene layer (OPP) 30 μ
Moreover, as the injection resin 8 used for the in-mold label container 10 of the present invention, an injection-moldable thermoplastic resin such as polypropylene, polyethylene, polystyrene, or the like can be used.

Next, a method for manufacturing an in-mold label container will be described with reference to FIGS. 9A, 9B, and 9C.

First, vacuum forming is performed on the sheet-like laminate 23 to obtain a sheet formed body 3 having a container shape. Further, a label 4 having a body label 5 and a bottom label 7 is prepared.

Next, as shown in FIG. 9A, a mold 20 having a cavity 22 and a core 21 is prepared, and the sheet molded body 3 is adsorbed to the core 21 of the mold 20.

Next, as shown in FIG. 9B, the label 4 is adsorbed in the cavity 22 of the mold 20.

Next, the core 21 is brought close to the cavity 22, the core 21 is inserted into the cavity 22, and the cavity 22 and the core 21 are clamped.

In this state, the injection resin 8 is injected into the space between the cavity 22 and the core 21 from the injection resin injection port 22a provided in the cavity 22 (FIG. 9C). In this case, the injection resin 8 injected from the spout 22 a enters between the sheet molded body 3 and the label 4 through the gate hole 7 a provided in the label 4, and the sheet molded body 3 and the label are injected by the injection resin 8. 4 is bonded, and the in-mold label container 10 is thus obtained.

The in-mold label container 10 obtained in this way is taken out from the mold 20 to the outside.

Next, the in-mold label container 10 is filled with the liquid content 35 in a nitrogen atmosphere, and then the lid member 30 is bonded to the flange portion 14 of the in-mold label container 10 so that the in-mold label container 10 is sealed. (See FIG. 1).

In this case, oxygen-containing air may be mixed into the in-mold label container 10 when the contents 35 are filled. In addition, air containing oxygen may be mixed in the content 35 itself.

According to the present embodiment, the sheet molded body 3 of the in-mold label container 10 is located on the inner surface side of the in-mold label container 10 and includes the gas barrier / oxygen absorbing resin layer 23b. Since the gas barrier / oxygen absorbing resin layer 23b has a gas barrier property and an oxygen absorbing property, it can effectively absorb oxygen present in the in-mold label container 10. For this reason, alteration of the contents 35 in the in-mold label container 10 can be effectively prevented.

As described above, according to the present embodiment, the in-mold label container 10 includes the sheet molded body 3 having a gas barrier property and a container shape, the label 4 having a gas barrier property, the sheet molded body 3 and the label 4. Since it has the injection resin interposed therebetween, even if a gap is generated at the edge of the label 4, the gas barrier property of the entire in-mold label container 10 can be maintained by the sheet molded body.

Furthermore, since the sheet molded body 3 is located on the inner surface side of the in-mold label container 10 and includes the gas barrier / oxygen absorbing resin layer 23b having gas barrier properties and oxygen absorbing properties, the gas barrier / oxygen absorbing resin layer 23b Oxygen present in the in-mold label container 10 can be effectively absorbed. For this reason, alteration of the contents 35 in the in-mold label container 10 can be effectively prevented.

Moreover, since the label 4 is disposed outside the injection resin 8 and includes the printing base material layer 24b, the design of the in-mold label container 10 can be improved.

<Modification>
Next, a modified example of the laminated body 23 constituting the sheet molded body 3 will be described with reference to FIG. As shown in FIG. 10, the laminate 23 constituting the sheet molded body 3 includes a polypropylene layer (PP) 23 a as a synthetic resin layer sequentially disposed from the outside, and a gas barrier / oxygen absorbing resin having gas barrier properties and oxygen absorbing properties. It has a layer 23b and a polypropylene layer (PP) 23c as an adhesive layer.

Among them, the gas barrier / oxygen absorbing resin layer 23b is composed of an EVOH layer (gas barrier resin layer) 23b1 that does not contain an oxygen absorbent, an EVOH layer (oxygen absorbing resin layer) 23b2 that contains the contained oxygen absorbent, and an oxygen absorbent. It has a three-layer structure including an EVOH layer (gas barrier resin layer) 23b3 not included. Among these, each of the EVOH layers 23b1 and 23b3 has gas barrier properties, but only the EVOH layer 23b2 containing an oxygen absorbent has gas barrier properties and oxygen absorbing properties.

3 Sheet molded body 3a Body sheet 3b Bottom sheet 3c Flange sheet 4 Label 5 Body label 5A Overlapping part 5a,..., 5h Part 7 Bottom label 8 Injection resin 10 In-mold label container 11 Body 12 Bottom part 14 Flange Part 20 Mold 21 Core 22 Cavity 22a Inlet 23 Laminate 23a Synthetic resin layer 23b Gas barrier / oxygen absorbing resin layer 23c Adhesive layer 24 Laminate 24a Adhesive layer 24b Printing substrate layer 24c Gas barrier layer 24d Synthetic resin layer 30 Lid 30a Aluminum layer 30b Heat seal layer 35 Contents

Claims

In the in-mold label container provided with the trunk and the bottom,
A sheet molded body including a trunk sheet and a bottom sheet, having a container shape, and having gas barrier properties,
A label having gas barrier properties;
An injection resin interposed between the sheet molded body and the label,
An in-mold characterized in that the sheet molded body is positioned inside the injection resin, the label is positioned outside the injection resin, and the sheet molded body includes a gas barrier / oxygen absorbing resin layer having gas barrier properties and oxygen absorbing properties. Label container.
The in-mold label container according to claim 1, wherein the gas barrier / oxygen absorbing resin layer has a gas barrier resin layer containing an oxygen absorbent.
3. The in-mold label container according to claim 1, wherein the gas barrier / oxygen absorbing resin layer includes a gas barrier resin layer and an oxygen absorbing resin layer containing an oxygen absorbent.
4. The in-mold label container according to any one of claims 1 to 3, wherein the gas barrier resin layer has an EVOH layer.
5. The in-mold label container according to any one of claims 1 to 4, wherein the oxygen absorbent has an organic compound having oxygen absorbability.
The in-mold label container according to any one of claims 1 to 4, wherein the oxygen absorbent has a reducible metal powder.