JP6541031B2 - In-mold label container and method of manufacturing the same - Google Patents

Description

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

  The in-mold label container is obtained by setting a label having a heat seal layer in advance in a mold at the time of injection molding and fusing the heat seal layer of the label to the surface of the injection resin by the heat of the resin at the time of molding. .

  An in-mold label container having a body and a bottom is known as an in-mold label container using a gas barrier label. In such an in-mold label container, a label having high rigidity and high gas barrier properties is fixed as an insert material to the body and the bottom. Thus, it is possible to provide an in-mold label container having a barrier property in which the mechanical strength of the entire container is enhanced by the stiffness of the label. Here, as the label, a label in which a main body layer made of high stiffness paper or synthetic paper and a barrier layer made of a gas barrier synthetic resin material are used.

  However, in the conventional in-mold label container, particularly the label is fixed to the barrel, a gap is formed between the edges of the label of the barrel. 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 has also been developed in which a sheet molding having high gas barrier properties is inserted into a mold in addition to the label. Such an in-mold label container is obtained by injecting an injection resin between the label and the sheet molded body from the gate hole of the label disposed in the mold.

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

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

  The present invention relates to an in-mold label container comprising a body and a bottom, which includes a body sheet and a bottom sheet, has a container shape and has a gas barrier property, and at least a bottom label and a body. 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 in the label, the label of the sheet molded body It is an in-mold label container characterized by providing a label holding part which has a plurality of radial ribs in a portion corresponding to a gate hole of the label among fields on the side.

  In the present invention, the label holding 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 the injection resin is provided at the center of the plurality of radial ribs in the surface on the label side of the sheet molded body.

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

  The present invention relates to a method for producing an in-mold label container, which comprises a body sheet and a bottom sheet, and has a sheet shape having a container shape and gas barrier properties, at least a bottom label and a body label, The process of preparing the label in which the hole is formed, the process of mounting the sheet compact and the label in the mold, and the injection of the injection resin between the sheet compact and the label from the gate hole of the label in the mold An in-mold label including a label holding 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 holding 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 a method of manufacturing an in-mold label container, wherein a gate receiving portion for receiving an injection resin is provided at the center of the plurality of radial ribs in the surface on the label side of the sheet molded body.

  A method of manufacturing an in-mold label container according to the present invention, wherein 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 properties of the in-mold label container can be improved even when a gap is formed between the edges of the label of the body. In addition, molding defects of the 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 the 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 compact and a label placed in a mold. FIG. 5 is a side sectional view showing a laminated structure of the sheet molded body. FIG. 6 is a developed view of a label having a torso label and a bottom 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 view showing a method of manufacturing an in-mold label container according to the present invention. FIG. 9B is a view showing the method of manufacturing the in-mold label container according to the present invention. FIG. 9C is a view showing the method of manufacturing the in-mold label container according to the present invention.

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

  1A to 9C show an embodiment of the present invention.

  As shown in FIG. 1A and FIG. 1B, the in-mold label container 10 is provided with a rectangular cylindrical barrel 11 having a flange portion 14 and a bottom 12 connected to the lower side of the barrel 11.

  Further, the in-mold label container 10 has the sheet molded body 3 having the gas barrier property, the label 4 having the gas barrier property, and the 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 the body portion sheet 3 a corresponding to the body portion 11, the bottom portion sheet 3 b corresponding to the bottom portion 12, and the flange portion sheet 3 c corresponding to the flange portion 14 It has a container shape that includes the gas barrier property as a whole (see FIGS. 2 to 5). Further, a gate receiving portion 33 to be described later is formed at the central portion of the bottom sheet 3 b 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 gas barrier properties as a whole. Further, at the center of the bottom label 7, a gate hole 7a for injecting the injection resin 8 is formed (see FIGS. 6 to 8). The gas barrier property referred to herein has at least oxygen barrier property, but may have a water vapor barrier.

  Further, 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 5a, 5b, 5c, 5d extending outward from the peripheral edge of the bottom label 7.

  Furthermore, no trunk label 5 is present between the portions 5a, 5b, 5c and 5d of the trunk 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 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 labels 5 do not overlap with each other in the portions 5a, 5b, 5c, 5d, and a gap is formed between the portions 5a, 5b, 5c, 5d of the body labels 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. The flange portion 14 has a flange portion sheet 3 c provided at the upper end of the body portion sheet 3 a of the sheet molded body 3 and an injection resin 8 injected onto the flange portion sheet 3 c.

  The contents are filled in the in-mold label container 10 having such a configuration. 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. 2 to 5.

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

  Among these, the inner end 31 a of eight radial ribs 31 is positioned inward from the peripheral edge 7 A of the gate hole 7 a of the bottom label 7, and a circumferential 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 arranged in the mold 20 including the core 21 and the cavity 22 described later, and the injection molding of the sheet molded body 3 and the label 4 is performed. Is pressed to the cavity 22 side. This prevents the radial rib 31 and the circumferential rib 32 from 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 coming around the outside of the label 4 from the gate hole 7a. Play a role.

  That is, the radial rib 31 and the circumferential rib 32 of the sheet molded body 3 constitute label pressing portions 31 and 32 for pressing the label 4 to the cavity 22 side.

  By the way, when the radial ribs 31 and the circumferential ribs 32 are not provided, the bottom label 7 of the labels 4 may be particularly warped in the mold 20, and the posture may be 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 a molding defect. Conceivable.

  On the other hand, according to the present invention, among the labels 4 disposed in the mold 20, the bottom label 7 is in particular the cavity 22 of the mold 20 by the radial ribs 31 of the sheet molding 3 and the circumferential ribs 32. The posture of the bottom label 7 can be stabilized by pressing it 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 to the outside of the bottom label, so that molding defects can be prevented in advance.

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

  The sheet molded body 3 includes the body sheet 3a having the flange sheet 3c and the bottom 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 laminate 23 constituting the sheet molded body 3 is a polypropylene layer (PP) 23a as a synthetic resin layer sequentially disposed from the outside, and ethylene vinyl alcohol as a gas barrier layer having gas barrier properties. A copolymer layer (EVOH) 23b and a polypropylene layer (PP) 23c as an adhesive layer are included.

  Then, by subjecting the sheet-like laminate 23 configured in this manner to vacuum forming, a sheet compact 3 having a container shape can be obtained.

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

  The label 4 having the body label 5 and the bottom label 7 comprises a laminate 24 having a layer configuration as shown in FIG.

  That is, as shown in FIG. 8, the label 4 having the body label 5 and the bottom label 7 is (i) an adhesive layer 24a with an injection resin, (ii) a synthetic resin layer 24b, and (iii) a gas barrier layer 24c. And (iv) A printed substrate layer 24d (here, the layer of (i) and the layer of (ii) can be used together). Each of these layers 24a, 24b, 24c, 24d is independently formed into a film and bonded (dry lamination) through an adhesive or melt extrusion (EC, coextrusion) of a part or all of the layers. It can also be formed by Also, the printing substrate layer can be omitted depending on the application and purpose.

  The adhesive layer 23a is not particularly limited as long as it adheres to the injection resin, but usually, the adhesion of a plastic made of the same material as the injection resin, polyethylene such as EVA (ethylene-vinyl acetate copolymer), etc. The resin which it has, or the plastic film etc. which co-extrusion process or coating process of those resin can be used suitably.

  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.

  As the gas barrier layer 24c, for example, (a) aluminum foil (7 to 25 μm), (b) metal or metal oxide laminated on plastic film by vapor deposition etc., for example, silicon oxide vapor deposited plastic film, aluminum oxide vapor deposited Plastic films, aluminum-deposited plastic films, (c) others, polyacrylonitrile resins, EVOH (ethylene vinyl alcohol copolymer), PVDC (polyvinylidene chloride) films, PVDC coated biaxially stretched plastic films, etc. may be mentioned. It may be selected appropriately depending on the performance. When the sheet molded body 3 has sufficient gas barrier properties, the label 4 does not necessarily have to have the gas barrier layer 24 c.

  In addition, polypropylene (PP) can be used as the synthetic resin layer 24 b.

  The above layers are formed by a dry lamination method, an extrusion lamination method, an extrusion coating method or other coating method according to a conventional method.

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

(1) Heat seal oriented polypropylene layer (HSOPP) 30μ / aluminum foil 7μ / oriented polypropylene layer (OPP) 30μ
(2) Heat seal oriented polypropylene layer (HSOPP) 30μ / VM-PET 12 / oriented polypropylene layer (OPP) 30μ
(3) Heat sealing agent coating / oriented polypropylene layer (OPP) 30μ / aluminum foil 7μ / oriented polypropylene layer (OPP) 30μ
Moreover, as the injection resin 8 used for the in-mold label container 10 of this invention, the injection moldable thermoplastic resin, for example, a polypropylene, polyethylene, a polystyrene, etc. may be used.

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

  First, the sheet-like laminated body 23 is subjected to vacuum forming to obtain a sheet molded body 3 having a container shape. Also, 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 compact 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 clamped (see FIG. 4).

  In this state, the injection resin 8 is injected from the injection resin gate (injection port) 22a provided in the cavity 22 into the space between the cavity 22 and the core 21 (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 penetrates the gate hole 7a of the bottom label 7 and is inserted into the mold 20. It protrudes. Further, the injection resin 8 injected from the injection port 22 a penetrates between the sheet molded body 3 and the label 4 from the gate hole 7 a provided in the label 4, and the sheet molded body 3 and the label 4 are made by the injection resin 8. Are adhered, and in this way, the in-mold label container 10 is obtained.

  During this time, of the labels 4 adsorbed to the cavity 22 side in the mold as described above, the bottom label 7 is particularly pressed to the cavity 22 side by the radial ribs 31 and the circumferential ribs 32 of the sheet molded body. ing. Therefore, when the injection resin 8 is injected into the mold 20 from the injection port 22a, the bottom label 7 does not warp in the mold 20 or its posture does not become unstable.

  For this reason, the injection resin 8 which has entered between the sheet molded body 3 and the label 4 from the gate hole 7a leaks outward from the gate hole 7a to the outside and goes around the outside of the label 4, causing a molding defect. There is nothing to do.

  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 which has entered between the sheet molded body 3 and the label 4 from the gate hole 7a is in a high temperature state, the radial rib 31 and the circumferential rib 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 does not have any problem.

  Further, in the sheet molded body 3, since the gate receiving portion 33 having a tapered shape for receiving the injection resin 8 is provided at the center of the radial rib 31, the gate receiving portion is injected with the injection resin 8 injected from the spout 22a. 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 thus obtained is taken out of the mold 20 outward.

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

  Moreover, while the label 4 is arrange | positioned on the outer side of the injection | emission resin 8, since the printing base material layer 24b is included, the designability of the in-mold label container 10 can be improved.

  Further, among the labels 4 disposed in the mold 20, the bottom label 7 is particularly pressed to the cavity 22 side of the mold 20 by the radial ribs 31 and the circumferential ribs 32 of the sheet molded body 3 to form the bottom label 7 The attitude 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 to the outside of the bottom label, so that molding defects can be prevented in advance.

  In the above embodiment, an example is shown 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, but the invention is not limited to this. The label 4 may be disposed on the outside of 8 and the label 4 may be disposed on the inside of the injection resin 8.

Reference Signs List 3 sheet molded body 3a body portion sheet 3b bottom portion sheet 3c flange portion sheet 4 label 5 body portion label 5a, ..., 5h portion 7 bottom portion label 8 injection resin 10 in-mold label container 11 body portion 12 bottom portion 14 flange portion 20 gold Mold 21 core 22 cavity 22a injection port 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 base material layer 30 lid 30a aluminum layer 30b heat seal layer 31 Radial rib 32 Circumferential rib 33 Gate receiving part

Claims (8)

In an in-mold label container comprising a body and a bottom,
A sheet molded body including a body sheet and a bottom sheet, having a container shape and having gas barrier properties;
A label comprising at least a bottom label and a torso label;
An injection resin interposed between the sheet molded body and the label, and a gate hole for injecting the injection resin is formed in the label;
A label holding 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 holding portion further has a circumferential rib formed by connecting the 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 for receiving the injection resin is provided at the center of the plurality of radial ribs in the surface on the label side 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 manufacturing method of the in-mold label container,
Preparing a label including a body sheet and a bottom sheet, having a container shape and having a gas barrier property, and a sheet having at least a bottom label and a body label and having a gate hole formed therein;
Mounting the sheet compact and the label in the mold;
Injecting the injection resin between the sheet compact and the label from the gate hole of the label in the mold;
A method for manufacturing an in-mold label container, comprising a label holding 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.   The in-mold according to claim 5, wherein the label holding portion further includes a circumferential rib formed by connecting the outer ends of the radial ribs, and the circumferential rib surrounds the gate hole. Method of manufacturing a label container.   The method for manufacturing an in-mold label container according to claim 5 or 6, further comprising a gate receiving portion for receiving the injection resin at the center of the plurality of radial ribs in 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. Method of manufacturing a mold label container.

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