JP6319652B2 - In-mold label container - Google Patents

Description

  The present invention relates to an in-mold label container capable of obtaining a reliable gas barrier property and a method for producing the same.

  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 fixed to the body part, and a gap is formed between the edges 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 product having a container shape having gas barrier properties inside the in-mold label container. In this case, it is also required to easily change the external structure of the in-mold label container.

JP-A-8-132477

  The present invention has been made in consideration of such points, and even if a gap is formed between the end edges of the label of the body part, a reliable gas barrier property can be obtained, and the external structure can be freely designed. It aims at providing the in-mold label container which can ensure degree.

  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, a sheet molded body having a container shape and having gas barrier properties, and at least a bottom label and a body part. Including a label and having a gas barrier property and an injection resin, wherein the sheet molded body, the label, and the injection resin are arranged in this order from the inner surface side to the outer surface side. It is a mold label container.

  The present invention is the in-mold label container, wherein the sheet molded body includes a gas barrier / oxygen absorbing resin layer having gas barrier properties and oxygen absorbing properties.

  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 the in-mold label container, wherein the gas barrier / oxygen absorbing resin layer includes a gas barrier resin layer and an oxygen absorbing resin layer containing an oxygen absorbent.

  The present invention is the in-mold label container, wherein the label has a gas barrier layer and an adhesive layer disposed on the inner surface of the gas barrier layer.

  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 edge edges of the body part label, and various appearances can be achieved using the injection resin. A structure can be formed.

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 a development view showing a label having a trunk label and a bottom label, and FIG. 7B is an assembly view showing the trunk label and the bottom label. FIG. 8 is a side sectional view showing a laminated structure of labels. FIGS. 9A, 9B and 9C are views showing a method for producing an in-mold label container according to the present invention. FIG. 10 is a view showing a modification of the laminated structure of the sheet molded body. FIGS. 11A and 11B are views showing a modification of the in-mold label container.

<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. The sheet molded body 3, the label 4, and the injection resin 8 are in-mold. They are arranged in this order from the inner surface side to the outer surface side of the mold label container 10.

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

  The label 4 is located between the sheet molded body 3 and the injection resin 8 and includes a body part label 5 corresponding to the body part 11 and a bottom part label 7 corresponding to the bottom part 12, and has a gas barrier property as a whole. (See FIGS. 7 to 8). The gas barrier property here has at least an oxygen barrier property, but may have a water vapor barrier property.

  Further, 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 a gas barrier property, the label 4 having the body label 5 and the bottom label 7 has a high gas barrier property.

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 FIG. 1 thru | or FIG. 3, the trunk | drum 11 of the in-mold label container 10 has the flange part 14. As shown in FIG. 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. Moreover, the trunk | drum 11 of the in-mold label container 10 has the cyclic | annular thread twist part 15 which protrudes below in the lower end periphery. The yarn twisting portion 15 is formed only from the injection resin 8 as will be described later.

  The in-mold label container 10 having such a configuration is filled with the liquid content 35. 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 which has a container shape can be obtained by performing vacuum forming with respect to the sheet-like laminated body 23 comprised in this way.

  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 absorbent 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 is in order from the sheet molded body 3 side to the injection resin 8 side (i) an adhesive layer 24a with the injection resin, ii) It comprises a printing substrate layer 24b, (iii) a gas barrier layer 24c, and (iv) an adhesive layer 24d (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. 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.

  For the adhesive layer 24d, the same material as the adhesive layer 24a can be used.

  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, labels having the following layer configuration can be used in order from the sheet molded body 3 side to the injection resin 8 side.

(1) Heat-sealed stretched polypropylene layer (HSOPP) 30μ / Aluminum foil 7μ / Heat-sealed stretched polypropylene layer (HSOPP) 30μ
(2) Heat-sealed stretched polypropylene layer (HSOPP) 30μ / VM-PET12 / Heat-seal stretched polypropylene layer (HSOPP) 30μ
(3) Heat sealant coating / stretched polypropylene layer (OPP) 30 μ / aluminum foil 7 μ / heat seal stretched polypropylene layer (HSOPP) 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 the in-mold label container will be described with reference to FIGS.

  First, the sheet-shaped laminate 23 is vacuum-formed to obtain a sheet-shaped 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 presses the label 4 against the sheet molded body 3 side while heating the label 4. The label 4 is heated by the injection resin 8, and the adhesive layers 24a and 24d are melted. The label 4 is bonded to the sheet molded body 3 through the adhesive layer 24a and is bonded to the injection resin 8 through the adhesive layer 24b. In this way, the in-mold label container 10 is obtained.

  In this case, the body portion 11 and the bottom portion 12 of the in-mold label container 10 are formed from the sheet molded body 3, the label 4, and the injection resin 8, and the flange portion 14 is formed from the sheet molded body 3 and the injection resin 8. The thread twist portion 15 is formed only from the injection resin 8.

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

  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, air containing oxygen 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 the gas barrier property on the outer surface side of the sheet molded body 3, and the label. 4, the gas barrier property of the in-mold label container 10 as a whole can be maintained by the sheet molded body even if a gap is generated at the edge of the label 4.

  Furthermore, since an annular threading portion 15 is provided on the periphery of the lower end of the body portion 11 of the in-mold label container 10, and this annular threading portion 15 is formed only from the injection resin 8, it is easy and simple. The thread twist portion 15 can be formed. For this reason, the thread twist part 15 can be formed easily and the external structure of the in-mold label container 10 can be easily changed by the injection resin 8.

  Moreover, since the label 4 is arrange | positioned on the outer side of the injection resin 8, and the printing base material layer 24b is included, the design property 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. 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.

  Next, a modified example of the in-mold label container 10 will be described with reference to FIGS.

  As shown in FIGS. 11A and 11B, the in-mold label container 10 includes a cylindrical body portion 11 having a flange portion 14, a bottom portion 12 connected to the lower portion of the body portion 11, and the body portion 11. You may have the cyclic | annular thread thread part 15 which is provided in the lower end periphery and protrudes below.

  In the modification shown in FIGS. 11A and 11B, other configurations are substantially the same as those in the embodiment shown in FIGS. 1 to 9A, 9B, and 9C.

  As shown in FIGS. 11 (a) and 11 (b), the in-mold label container 10 includes the sheet molded body 3, the label 4, and the injection resin 8 that are sequentially arranged from the inner surface side toward the outer surface side. The body label 5 and the bottom label 7 of the label 4 are separated from each other (see FIG. 11B).

  In each of the above-described embodiments, an example is shown in which an annular threading portion 15 that protrudes downward is provided on the periphery of the lower end of the body portion 11, and the threading portion 15 is formed of the injection resin 8. However, the present invention is not limited to this, and a heat insulating rib having heat insulating properties may be provided on the body portion 11, and the heat insulating rib may be formed of the injection resin 8.

  By bringing the injection resin 8 to the outside of the in-mold label container 10 in this way, the thread twist portion 15 or the heat insulating rib can be formed of the injection resin 8, and the appearance structure of the in-mold label container 10 is injected. It can be freely changed by the resin 8.

  Furthermore, in each of the above embodiments, the sheet molded body 3 has gas barrier properties and oxygen absorbing properties and the label 4 has gas barrier properties. However, as long as the sheet molded body 3 and the label 4 have gas barrier properties, Any sheet molded body 3 and label 4 may be used.

  For example, both (1) the sheet molded body 3 and the label 4 may have gas barrier properties and oxygen absorbing properties, and (2) the sheet molded body 3 has gas barrier properties, and the labels 4 have gas barrier properties and oxygen absorbing properties. (3) Both the sheet molded body 3 and the label 4 may have only gas barrier 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 (5)

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 including at least a bottom label and a body label and having gas barrier properties;
Injected resin, sheet molded body, label, and injected resin are arranged in this order from the inner surface to the outer surface , the label corresponds to the bottom label corresponding to the bottom of the in-mold label container, and the body An in-mold label container having a plurality of portions extending radially outward from the periphery of the bottom label.   The in-mold label container according to claim 1, wherein the sheet molded body includes a gas barrier / oxygen-absorbing resin layer having gas barrier properties and oxygen absorbing properties.   The in-mold label container according to claim 2, wherein the gas barrier / oxygen absorbing resin layer has a gas barrier resin layer containing an oxygen absorbent.   The in-mold label container according to claim 2, wherein the gas barrier / oxygen absorbing resin layer includes a gas barrier resin layer and an oxygen absorbing resin layer containing an oxygen absorbent.   The in-mold label container according to any one of claims 1 to 4, wherein the label includes a gas barrier layer and an adhesive layer disposed on an inner surface of the gas barrier layer.

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