KR102179800B1 - In-mold label container - Google Patents

Abstract

An object of the present invention is to provide an in-mold label container excellent in gas barrier properties and oxygen absorption properties. The in-mold label container 10 includes a body part 11 and a bottom part 1. The in-mold label container 10 has a shape of a container and has a gas barrier property and a sheet molded body 3 positioned inside, a label 4 having a gas barrier property and is positioned outside, and a sheet molded body ( It has an injection resin (8) interposed between 3) and the label (4). The laminate 23 of the sheet molded body 3 has a gas barrier/oxygen absorbing resin layer 23b. Thereby, even if a gap is formed at the edge of the label 4, reliable gas barrier properties can be obtained, and oxygen mixed therein can be absorbed.

Description

In-mold label container {IN-MOLD LABEL CONTAINER}

The present invention relates to an in-mold label container capable of obtaining reliable gas barrier properties.

The in-mold label container is obtained by preliminarily setting a label having a heat seal layer on a mold during injection molding, and fusing the heat seal layer of the label on the surface of the injection resin with 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 portion and a bottom portion is known. In such an in-mold label container, a label having strong elasticity and high gas barrier properties is fixed to the body portion and the bottom portion as an insert material. Thereby, it is possible to provide an in-mold label container having a barrier property in which the mechanical strength of the entire container is increased by the elastic strength of the label. Here, as the label, a laminate of a body layer made of high elastic paper or synthetic paper and a barrier layer made of a gas barrier synthetic resin material is used.

However, in the conventional in-mold label container, in particular, the label is fixed to the body portion, but a gap is formed between the label end edges of the body portion. For this reason, there is a problem in that the gas barrier property is deteriorated due to the gap between the edge of the label.

In order to solve this problem, it is considered to install a sheet molded body having a container shape having gas barrier properties inside the in-mold label container. In this case, if the sheet-formed body can have oxygen absorption, it is convenient because the sheet-formed body can absorb oxygen mixed in the in-mold label container and prevent deterioration of the contents.

Japanese Patent Laid-Open No. Hei 8-132477

The present invention has been made in consideration of these points, and provides an in-mold label container capable of obtaining reliable gas barrier properties even when a gap is formed between the end edges of the label of the body part, and absorbing oxygen mixed therein. It is aimed at.

The present invention is an in-mold label container having a body portion and a bottom portion, including a body portion sheet and a bottom portion sheet, a sheet molded body having a container shape and having gas barrier properties, and a label having gas barrier properties And, an injection resin interposed between the sheet molding body and the label, the sheet molding body is located inside the injection resin, the label is located outside the injection resin, and the sheet molding body has gas barrier properties and oxygen absorption properties. An in-mold label container comprising a gas barrier/oxygen absorbing resin layer having.

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

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 absorbing agent.

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, wherein the oxygen absorbing agent has an organic compound having oxygen absorbing property.

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

As described above, according to the present invention, even when a gap is formed between the end rims of the label of the body part, the gas barrier property of the in-mold label container can be improved, and the contents of the contents are deteriorated by adequately absorbing the oxygen mixed therein. Can be prevented.

1 is a side cross-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.
3 is a perspective view showing an in-mold label container.
4 is a perspective view showing a sheet molded body.
5 is a plan view showing a sheet molded body.
6 is a side cross-sectional view showing a laminated structure of a sheet molded body.
Fig. 7A is an exploded view showing a label having a body part label and a bottom label, and Fig. 7B is an assembly view showing a body part label and a bottom label.
Fig. 8 is a side cross-sectional view showing a laminated structure of labels.
9A, 9B, and 9C are diagrams showing a method of manufacturing an in-mold label container.
10 is a side cross-sectional view showing a modified example of a laminated structure of a sheet molded body.

<Embodiment>

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

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

1 to 3, the in-mold label container 10 has 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 It is equipped with.

In addition, the in-mold label container 10 includes a sheet molded body 3 having gas barrier properties, a label 4 having gas barrier properties, and injection molding interposed between the sheet molded body 3 and the label 4. It has resin (8).

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

In addition, 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 corresponds to the body label 5 and the bottom 12 corresponding to the body 11 It has gas barrier properties as a whole, including the bottom label 7 to be described. Further, a gate hole 7a for ejecting 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 oxygen barrier property, but may have a water vapor barrier.

In addition, as shown in Fig. 7A and Fig. 7B, the moving body label 5 and the bottom label 7 constituting the label 4 are integrally formed. And the body part label 5 has a plurality of parts 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h extending outward from the periphery of the bottom label 7.

In addition, between each part (5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h) of the body part label 5, each part (5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h) Are overlapped with each other to form the overlapping portion 5A.

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

In this case, in the body part label 5, the parts 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h are overlapped with each other to form the overlapped part 5A. For this reason, there is no gap formed between the parts 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h of the body part label 5, whereby the in-mold label container 10 as a whole, Gas barrier properties can be improved.

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

A liquid content 35 is filled in the in-mold label container 10 including this configuration. Next, a cover member 30 including an aluminum layer 30a and a heat seal layer 30b is adhered to the flange portion 14 of the in-mold label container 10, so that the in-mold label container 10 is sealed. do.

Next, the sheet molded body 3 will be described with reference to FIGS. 4 to 6.

As described above, the sheet molded body 3 includes a body part sheet 3a having a flange part sheet 3c and a bottom part sheet 3b, and has a container shape. In this case, the sheet molded body 3 is constituted by a sheet-like laminate 23 having a layered structure as shown in FIG. 6.

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

Then, the sheet-shaped body 3 having a container shape can be obtained by performing vacuum molding on the sheet-like laminate 23 thus constituted.

Next, the sheet molded body 3 will be further described. Among the laminates 23 constituting the sheet molded body 3, the gas barrier/oxygen absorbing resin layer 23b contains a single-layer EVOH layer (gas barrier resin layer) containing an oxygen absorbing agent contained therein, and has gas barrier properties. And oxygen absorption.

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

Examples of compounds having a carbon-carbon double bond are polybutadiene, polyisoprene, polychloroprene, poly(2-ethylbutadiene), poly(2-butylbutadiene) and any other polydiene, mainly in the 1,4-position What is obtained by polymerization of the monomer molecule in each (1,4-polybutadiene, etc.); Ring-opening metathesis polymers of any cycloolefin (polyoctenylene, polypentenylene, polynorbornene, etc.); And block copolymers having respective polydiene blocks such as styrene-isoprene-styrene triblock copolymers. Among these examples, polybutadiene and polyoctenylene are preferred.

When the oxygen absorbing agent is particularly an organic compound, it becomes possible to improve the oxygen absorbing performance of the oxygen absorbing resin layer by incorporating one or more types of transition metal salts into the layer.

Examples of the transition metal salt include iron salt, nickel salt, copper salt, manganese salt, cobalt salt, rhodium salt, titanium salt, chromium salt, vanadium salt, and ruthenium salt. However, metal salts are not limited to them. Among these salts, iron salts, nickel salts, copper salts, manganese salts and cobalt salts are preferable, manganese salts and cobalt salts are more preferable, and cobalt salts are even more preferable.

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 part label 5 and the bottom part label 7 includes a layered product 24 having a layered structure as shown in FIG. 8.

That is, as shown in Fig. 8, the label 4 having the body label 5 and the bottom label 7 includes (i) an adhesive layer 24a with an injection resin, and (ii) a synthetic resin layer 24d. ), (iii) a gas barrier layer 24c, and (iv) a 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 can be formed by independently forming a film and bonding (dry lamination) via an adhesive, or by melt extrusion (EC, coextrusion) of a part or all of the layers. . In addition, the printing substrate layer may be omitted depending on the use and purpose.

The adhesive layer 24a is not particularly limited as long as it adheres to the injection resin, but is usually a plastic made of the same material as the injection resin, or a resin having adhesive properties such as polyethylene containing EVA (ethylene/vinyl acetate copolymer), or these A plastic film in which the resin is coextruded or coated can be suitably 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 suitably used.

As the gas barrier layer 24c, for example, (a) an aluminum foil (7 to 25 µm), (b) a metal or metal oxide laminated on a plastic film or the like by vapor deposition, for example, a silicon oxide deposited plastic film, Aluminum oxide deposited plastic film, aluminum deposited plastic film, (c) others, polyacrylonitrile resin, EVOH (ethylene vinyl alcohol copolymer), PVDC (polyvinylidene chloride) film, PVDC coated biaxially stretched plastic film, etc. And may be appropriately selected according to desired performance.

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

In addition, each of the layers is formed by a dry lamination method, an extrusion lamination method, an extrusion coating method, or other coating methods according to a conventional method.

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

(1) Heat seal stretched polypropylene layer (HSOPP) 30 μ / Aluminum foil 7 μ / Stretch polypropylene layer (OPP) 30 μ

(2) Heat seal stretched polypropylene layer (HSOPP) 30μ/VM-PET12/stretched polypropylene layer (OPP) 30μ

(3) Heat seal coating/stretched polypropylene layer (OPP) 30μ/ aluminum foil 7μ/stretched polypropylene layer (OPP) 30μ

Further, as the injection resin 8 used in the in-mold label container 10 of the present invention, a thermoplastic resin capable of injection molding, for example, polypropylene, polyethylene, polystyrene, or the like can be used.

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

First, the sheet-formed body 3 having a container shape is obtained by performing vacuum molding on the sheet-shaped laminate 23. In addition, 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 to 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 mold-fastened.

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

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

Next, the liquid content 35 is filled in the in-mold label container 10 in a nitrogen atmosphere, and thereafter, the cover member 30 is adhered to the flange portion 14 of the in-mold label container 10, The in-mold label container 10 is sealed (see Fig. 1).

In this case, at the time of filling the contents 35, air containing oxygen may be mixed in the in-mold label container 10. In addition, there are cases in which air containing oxygen is mixed in the contents 35 itself.

According to this 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 a gas barrier/oxygen absorbing resin layer 23b. . Since this gas barrier/oxygen absorbing resin layer 23b has gas barrier properties and oxygen absorbing properties, it can effectively absorb oxygen present in the in-mold label container 10. For this reason, deterioration 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 a sheet molded body 3 having a gas barrier property and a container shape, a label 4 having gas barrier properties, and a sheet molded body 3. Since the injection resin interposed between the labels 4 is provided, even if a gap is generated in the edge of the label 4, the gas barrier property as a whole of the in-mold label container 10 can be maintained by the sheet molded body.

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

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

<modification example>

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

Among them, the gas barrier/oxygen absorbing resin layer 23b is an EVOH layer (gas barrier resin layer) 23b1 that does not contain an oxygen absorbing agent, and an EVOH layer (oxygen absorbing resin layer) that does not contain oxygen absorbing agent (23b2). And, it has a three-layer structure including an EVOH layer (gas barrier resin layer) 23b3 that does not contain an oxygen absorber. Of these, all of the EVOH layers 23b1 and 23b3 have gas barrier properties, but only the EVOH layer 23b2 containing an oxygen absorbing agent has gas barrier properties and oxygen absorbing properties.

3 sheet molding
3a fuselage seat
3b bottom sheet
3c flange seat
4 labels
5 Fuselage label
5A overlap
5a, ..., 5h part
7 bottom label
8 injection resin
10 in-mold label container
11 fuselage
12 bottom
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 laminated body
24a adhesive layer
24b printing substrate layer
24c gas barrier layer
24d synthetic resin layer
30 cover member
30a aluminum layer
30b heat seal layer
35 contents

Claims (6)

In the in-mold label container having a body portion and a bottom portion,
A sheet molded body having a container shape and having a gas barrier property, including a body part sheet and a flat octagonal bottom sheet,
A label having gas barrier properties,
Equipped with 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 includes a gas barrier and an oxygen absorbing resin layer having gas barrier properties and oxygen absorbing properties,
The label includes a bottom label and a plurality of portions separated from each other while extending outward from the periphery of the bottom label, and has a body label integrally formed with the bottom label, and the bottom label has a flat octagonal shape, and Each portion of the label is an in-mold label container, characterized in that extending radially outward from each side of the bottom label. The in-mold label container according to claim 1, wherein the gas barrier and the oxygen absorbing resin layer have a gas barrier resin layer containing an oxygen absorbing agent. The in-mold label container according to claim 1, wherein the gas barrier and the oxygen absorbing resin layer have a gas barrier resin layer and an oxygen absorbing resin layer containing an oxygen absorbing agent. The in-mold label container according to claim 2 or 3, wherein the gas barrier resin layer has an EVOH layer. The in-mold label container according to claim 2 or 3, wherein the oxygen absorbing agent has an organic compound having oxygen absorbing property. The in-mold label container according to claim 2 or 3, wherein the oxygen absorbing agent has a powder of a reducible metal.

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