JP2017065693A - In-mold label container and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-mold label container excellent in gas barrier properties.SOLUTION: An in-mold label container 10 comprises a trunk part 11 and a bottom part. The in-mold label container 10 comprises: a sheet molded body 3 formed into a container-shape and has gas barrier properties; a label 4 which has gas barrier properties; and an injection resin 8 interposed between the sheet molded body 3 and the label 4. The sheet molded body 3 has a label pressing part for pressing the label 4 to the inner face of a metal mold.SELECTED DRAWING: Figure 1A

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.

JP-A-8-325317

  In order to solve such a problem, an in-mold label container in which a sheet molded body having a high gas barrier property is inserted into a mold in addition to the label has been developed. Such an in-mold label container can be obtained by injecting an injection resin between a label and a sheet molded body from a gate hole of a label arranged in a mold.

  However, if the label is warped in the mold, during the molding of the in-mold label container, the injection resin injected between the label and the sheet molded body from the label gate hole flows out of the gate hole again and is labeled. It may wrap around outside and cause molding defects.

  The present invention has been made in consideration of such points, and even if a gap is formed between the edges of the label of the body part, a reliable gas barrier property can be obtained, and molding defects can be suppressed. An object is to provide an in-mold label container and a method for manufacturing the same.

  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. A label including a label, and an injection resin interposed between the sheet molded body and the label, forming a gate hole for injecting the injection resin into the label, and the label of the sheet molded body In the in-mold label container, a label pressing portion having a plurality of radial ribs is provided in a portion of the side surface corresponding to the gate hole of the label.

  In the present invention, the label pressing portion further includes a circumferential rib formed by connecting outer ends of the radial ribs, and the circumferential rib surrounds the gate hole. It is a container.

  The present invention is the in-mold label container characterized in that a gate receiving portion for receiving an injection resin is provided at the center of the plurality of radial ribs on the label side surface of the sheet molded body.

  The present invention is the in-mold label container, wherein an inner end of each radial rib is located inside the gate hole of the label, and an outer end of each radial rib is located outside the gate hole of the label.

  The present invention provides a method for manufacturing an in-mold label container, including a body sheet and a bottom sheet, a sheet molded body having a container shape and gas barrier properties, at least a bottom label and a body label, and a gate. A step of preparing a label in which holes are formed, a step of mounting a sheet molded body and a label in the mold, and an injection resin are injected into the mold between the sheet molded body and the label from the gate hole of the label. An in-mold label comprising a label pressing portion having a plurality of radial ribs in a portion corresponding to the gate hole of the label in the label-side surface of the sheet molded body. It is a manufacturing method of a container.

  In the present invention, the label pressing portion further includes a circumferential rib formed by connecting outer ends of the radial ribs, and the circumferential rib surrounds the gate hole. It is a manufacturing method of a container.

  The present invention is the method for manufacturing an in-mold label container, characterized in that a gate receiving portion for receiving an injection resin is provided at the center of the plurality of radial ribs on the label side surface of the sheet molded body.

  According to the present invention, the inner end of each radial rib is located inside the gate hole of the label, and the outer end of each radial rib is located outside the gate hole of the label. It is.

  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 end edges of the label of the body portion. Moreover, the molding defect of an in-mold label container can be suppressed as much as possible.

FIG. 1A is a side sectional view showing an in-mold label container according to an embodiment of the present invention. FIG. 1B is a plan view showing an in-mold label container according to the embodiment of the present invention. FIG. 2 is a plan view showing a sheet molded body of the in-mold label container. FIG. 3 is a side sectional view showing a sheet molded body of the in-mold label container. FIG. 4 is an enlarged view showing a sheet molded body and a label disposed in the mold. FIG. 5 is a side sectional view showing a laminated structure of a sheet molded body. FIG. 6 is a development view showing a label having a body part label and a bottom part label. FIG. 7 is an assembly view showing a label having a body label and a bottom label. FIG. 8 is a side sectional view showing a laminated structure of labels. FIG. 9A is a diagram showing a method for manufacturing an in-mold label container according to the present invention. FIG. 9B is a diagram showing a method for manufacturing an in-mold label container according to the present invention. FIG. 9C is a diagram showing a method for manufacturing an in-mold label container according to the present invention.

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

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

  As shown in FIG. 1A and FIG. 1B, the in-mold label container 10 includes a roughly rectangular tube-shaped body portion 11 having a flange portion 14, and a bottom portion 12 connected below 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 inside the injection resin 8, and includes a body sheet 3 a corresponding to the body part 11, a bottom sheet 3 b corresponding to the bottom part 12, and a flange part sheet 3 c corresponding to the flange part 14. It has a container shape including it and has a gas barrier property as a whole (see FIGS. 2 to 5). Further, a gate receiving portion 33 described later is formed at the center of the bottom sheet 3b of the sheet molded body 3.

  The label 4 is located outside the injection resin 8 and includes a body label 5 corresponding to the body 11 and a bottom label 7 corresponding to the bottom 12, and has a gas barrier property as a whole. A gate hole 7a for injecting the injection resin 8 is formed in the center of the bottom label 7 (see FIGS. 6 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. 6 and 7, 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 5 a, 5 b, 5 c, and 5 d that extend outward from the periphery of the bottom label 7.

  Further, the body label 5 does not exist between the portions 5a, 5b, 5c, and 5d of the body label 5, and a gap is formed.

  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 portions 5a, 5b, 5c, and 5d of the body portion label 5 do not overlap each other, and a gap is formed between the portions 5a, 5b, 5c, and 5d of the body portion label 5.

  By the way, as shown to FIG. 1A and FIG. 1B, 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.

  The in-mold label container 10 having such a configuration is filled with contents. 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 further described with reference to FIGS.

  As shown in FIGS. 2 to 5, a plurality of, for example, eight radial ribs 31 are provided on the bottom label 7 side of the bottom sheet 3 b of the sheet molded body 3 on the portion corresponding to the gate hole 7 a of the bottom label 7. Is provided. Further, a circumferential rib 32 is provided on the surface of the bottom sheet 3b on the bottom label 7 side, connecting the outer ends of the radial ribs 31.

  Of these, the inner ends 31 a of the eight radial ribs 31 are located inward from the peripheral edge 7 A of the gate hole 7 a of the bottom label 7, and the circumference formed by connecting the outer ends of the eight radial ribs 31. The rib 32 is located outward from the peripheral edge 7A of the gate hole 7a.

  The radial ribs 31 and the circumferential ribs 32 are provided in the label 4 in the mold 20 when the sheet molded body 3 and the label 4 are arranged in the mold 20 including the core 21 and the cavity 22 which will be described later. Is pressed to the cavity 22 side. As a result, the radial rib 31 and the circumferential rib 32 prevent the injection resin 8 injected between the label 4 and the sheet molded body 3 from the gate hole 7a of the label 4 from going around the label 4 from the gate hole 7a. To play a role.

  That is, the label pressing portions 31 and 32 that press the label 4 toward the cavity 22 are constituted by the radial ribs 31 and the circumferential ribs 32 of the sheet molded body 3.

  By the way, when the radial rib 31 and the circumferential rib 32 are not provided, the bottom label 7 among the labels 4 in the mold 20 may be warped and the posture may become unstable. In this case, the injection resin 8 that has entered the bottom label 7 from the gate hole 7a of the bottom label 7 leaks outward from the gate hole 7a, and wraps around the outside of the bottom label 7 to cause molding defects. Conceivable.

  On the other hand, according to the present invention, among the labels 4 arranged in the mold 20, the bottom label 7 is formed by the radial ribs 31 and the circumferential ribs 32 of the sheet molded body 3 and the cavity 22 of the mold 20. It is possible to stabilize the posture of the bottom label 7 by pressing to the side. As a result, the injection resin 8 injected from the gate hole 7a of the bottom label 7 does not leak outward from the gate hole 7a and wrap around the outside of the bottom label, thereby preventing molding defects.

  In addition, a gate receiving portion 33 for receiving a gate 22a described later and receiving an injection resin 8 from the gate 22a is provided at the center of the radial rib 31 on the surface of the sheet molded body 3 on the label 4 side. The gate receiving portion 33 is formed in a concave shape having a taper shape so as to be drawn into the core 21 side of the mold 20 described later. On the other hand, a recess 21a is formed on the core 21 side corresponding to the gate receiving portion 33 having a tapered shape.

  Then, by fitting the gate receiving portion 33 of the sheet molded body 3 into the recess 21a on the core 21 side, the sheet molded body 3 can be reliably mounted on the core 21 side.

  By the way, 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. 5, the laminated body 23 constituting the sheet molded body 3 is composed of a polypropylene layer (PP) 23a as a synthetic resin layer sequentially arranged from the outside and ethylene vinyl alcohol as a gas barrier layer having gas barrier properties. It includes a copolymer layer (EVOH) 23b 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 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 synthetic resin layer 24b, and (iii) a gas barrier layer 24c. And (iv) the printing base material 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 23a is not particularly limited as long as it adheres to the injection resin. Usually, the adhesive layer 23a has an adhesive property such as a plastic made of the same material as the injection resin and 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 24d 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. When the sheet molded body 3 has a sufficient gas barrier property, the label 4 does not necessarily have to have the gas barrier layer 24c.

  As the synthetic resin layer 24b, polypropylene (PP) 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, 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, 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 attracted 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 clamped (see FIG. 4).

  In this state, the injection resin 8 is injected into the space between the cavity 22 and the core 21 from the injection resin gate (injection port) 22a provided in the cavity 22 (FIG. 9C). In this case, the spout 22a is formed in the protrusion 22b formed in the cavity 22, and the spout 22a formed in the protrusion 22b passes through the gate hole 7a of the bottom label 7 and enters the mold 20. It protrudes. The injection resin 8 injected from the spout 22a enters between the sheet molded body 3 and the label 4 through the gate hole 7a provided in the label 4, and the injection molded resin 8 causes the sheet molded body 3 and the label 4 to enter. Are bonded, and thus the in-mold label container 10 is obtained.

  During this time, among the labels 4 adsorbed on the cavity 22 side in the mold as described above, especially the bottom label 7 is pressed against the cavity 22 side by the radial ribs 31 and the circumferential ribs 32 of the sheet molding. ing. For this reason, when the injection resin 8 is injected into the mold 20 from the spout 22a, the bottom label 7 is not warped in the mold 20 and its posture is not unstable.

  For this reason, the injection resin 8 that has entered between the sheet molded body 3 and the label 4 from the gate hole 7a leaks outward from the gate hole 7a and wraps around the outside of the label 4 to cause defective molding. I will not let you.

  The injection resin 8 that has entered between the sheet molded body 3 and the label 4 from the gate hole 7 a spreads radially along the radial ribs 31. At this time, since the injection resin 8 that has entered between the sheet molded body 3 and the label 4 through the gate hole 7a is in a high temperature state, the radial ribs 31 and the circumferential ribs 32 are partially melted and deformed. It spreads between the molded body 3 and the label 4.

  For this reason, even if the radial ribs 31 and the circumferential ribs 32 are provided on the sheet molded body 3, the injection action by the injection resin 8 is not hindered.

  Moreover, since the gate receiving part 33 with the taper shape which receives the injection resin 8 is provided in the center of the radial rib 31 among the sheet molded objects 3, the injection resin 8 injected from the spout 22a is made into this gate receiving part. After being received by 33, the injection resin 8 can be smoothly guided in the horizontal direction between the sheet molded body 3 and the label 4 by the gate receiving portion 33 having a tapered shape.

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

  As described above, according to the present embodiment, the in-mold label container 10 has a gas-barrier sheet-shaped article 3 having a container shape, a gas-barrier label 4, and the sheet-molded article 3 and the label 4. Therefore, even if a gap is generated at the edge of 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.

  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.

  Further, among the labels 4 arranged in the mold 20, the bottom label 7 is pressed against the cavity 22 side of the mold 20 by the radial ribs 31 and the circumferential ribs 32 of the sheet molded body 3. The posture can be stabilized. As a result, the injection resin 8 injected from the gate hole 7a of the bottom label 7 does not leak outward from the gate hole 7a and wrap around the outside of the bottom label, thereby preventing molding defects.

  In the above-described embodiment, an example in which the sheet molded body 3 is located inside the injection resin 8 and the label 4 is located outside the injection resin 8 is shown. The label 4 may be disposed inside the injection resin 8.

3 Sheet molded body 3a Body sheet 3b Bottom sheet 3c Flange sheet 4 Label 5 Body label 5a,..., 5h Portion 7 Bottom label 8 Injection resin 10 In-mold label container 11 Body 12 Bottom 14 Flange 20 Gold Mold 21 Core 22 Cavity 22a Inlet 23 Laminate 23a Synthetic resin layer 23b Gas barrier layer 23c Adhesive layer 24 Laminate 24a Adhesive layer 24b Synthetic resin layer 24c Gas barrier layer 24d Printing substrate layer 30 Lid 30a Aluminum layer 30b Heat seal layer 31 Radial rib 32 Circumferential rib 33 Gate receiving portion

Claims (8)

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;
An injection resin interposed between the sheet molded body and the label, forming a gate hole for injecting the injection resin on the label;
An in-mold label container, wherein a label pressing portion having a plurality of radial ribs is provided in a portion corresponding to the gate hole of the label in the surface on the label side of the sheet molded body.   The in-mold according to claim 1, wherein the label pressing portion further includes a circumferential rib formed by connecting outer ends of the radial ribs, and the circumferential rib surrounds the gate hole. Label container.   The in-mold label container according to claim 2, wherein a gate receiving portion that receives an injection resin is provided at the center of the plurality of radial ribs on the label-side surface of the sheet molded body.   The inner end of each radial rib is located inside the gate hole of the label, and the outer end of each radial rib is located outside the gate hole of the label. Mold label container. In the method of manufacturing an in-mold label container,
Including a body sheet and a bottom sheet, having a container shape and having a gas barrier property, at least a bottom label and a body label, and preparing a label in which a gate hole is formed;
Attaching the sheet compact and label in the mold;
A step of injecting an injection resin between the sheet molded body and the label into the mold from the gate hole of the label,
A method for producing an in-mold label container, comprising: a label pressing portion having a plurality of radial ribs in a portion corresponding to the gate hole of the label in the surface on the label side of the sheet molded body.   6. The in-mold according to claim 5, wherein the label pressing portion further includes a circumferential rib formed by connecting outer ends of the radial ribs, and the circumferential rib surrounds the gate hole. Label container manufacturing method.   The method for producing an in-mold label container according to claim 5 or 6, wherein a gate receiving portion for receiving an injection resin is provided at the center of the plurality of radial ribs on the label side surface of the sheet molded body. .   The inner end of each radial rib is located inside the gate hole of the label, and the outer end of each radial rib is located outside the gate hole of the label. Manufacturing method of mold label container.

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