JP6955690B2 - In-mold label container, its manufacturing method, and container with lid - Google Patents

Description

The present invention relates to an in-mold label container, a method for producing the same, and a container with a lid.

Conventionally, as a container for sealing and packaging various beverages, confectionery, snack foods, etc., an in-mold container made by injection molding of plastic is often used.

The container has a body portion, a flange portion provided at the upper end of the body portion, and a bottom portion provided at the lower end portion of the body portion. In addition, the flange part is sealed with a lid material from the top to seal the contents, and in the case of beverages, a straw is inserted into the lid material for drinking, and in the case of confectionery and snacks, the lid material of Easy Peel is opened. It is common to eat it. In addition, the overcap may be fitted to the upper part of the flange as a dust shield from the outside.

On the other hand, when the contents are left behind, for example, when moving by car or train, or when carrying a container in a bag, in the case of beverages, the contents may leak from the straw insertion slot, or confectionery / snacks. In this case, usability and storability are problems such as the lid coming off and the contents being scattered.

Japanese Unexamined Patent Publication No. 2014-091563 Japanese Unexamined Patent Publication No. 2014-0947776

The present invention has been made in consideration of such points, and an object of the present invention is to provide an in-mold label container that can be reclosed, a method for producing the same, and a container with a lid.

In the present invention, a lid having a top surface portion, a side surface portion provided on the peripheral edge of the lower end of the top surface portion, and an inner fitting portion provided on the inner peripheral surface of the side surface portion is attached, and a label surface is attached. In a cylindrical in-mold label container obtained by injecting an injection resin into a container, a body portion, a flange portion provided at the upper end of the body portion, and a bottom portion provided at the lower end portion of the body portion are provided. The body portion has an injection resin portion forming an inner peripheral surface and a label forming an outer peripheral surface, and a tubular portion mounted on the inside of the side surface portion is provided upward from the flange portion. This is an in-mold label container provided with an outer fitting portion that fits into the inner fitting portion of the lid on the outer peripheral surface of the cylinder portion.

The present invention is an in-mold label container having a screw structure or a plug structure in which the outer fitting portion of the cylinder portion is fitted with the inner fitting portion of the lid body.

The present invention is an in-mold label container in which a circumferential groove is formed at an end portion on the flange portion side of the outer peripheral surface of the tubular portion.

The present invention is an in-mold label container in which a plurality of reinforcing ribs extending in the vertical direction are provided in a circumferential groove formed on the outer peripheral surface of the tubular portion.

In the present invention, a cylindrical in-mold label container obtained by injecting an injection resin onto the label surface, a top surface portion, a side surface portion provided on the lower peripheral edge of the top surface portion, and an inner peripheral surface of the side surface portion. The in-mold label container is provided with an inner fitting portion provided on the in-mold label container and a lid body to be attached to the in-mold label container. And a bottom portion provided at the lower end of the body portion, the body portion has an injection resin portion forming an inner peripheral surface and a label forming an outer peripheral surface, and upward from the flange portion. , A container with a lid provided with a tubular portion mounted inside the side surface portion and an outer fitting portion fitted to the inner fitting portion of the lid on the outer peripheral surface of the tubular portion. ..

The present invention includes a body portion, a flange portion provided at the upper end of the body portion, and a bottom portion provided at the lower end of the body portion, and the body portion includes an injection resin portion forming an inner peripheral surface. A cylinder portion having a label forming an outer peripheral surface and being mounted on the inside of the side surface portion is provided upward from the flange portion, and an outer fitting portion is provided on the outer peripheral surface of the cylinder portion. In a method for manufacturing an in-mold label container in which a cylindrical in-mold label container is manufactured using a mold including a cavity and a core, a step of inserting a label on the inner peripheral surface of the cavity and a core inside the cavity are provided. The label is placed on the inner peripheral surface of the cavity in the step of mounting the slide mold that can be slid laterally on the upper part of the cavity and in the space between the cavity, the core, and the slide mold. A step of injecting an injection resin so as to be pressed against the core is provided, the body portion is formed between the cavity and the core, the flange portion is formed between the cavity and the slide mold, and the core and the core are formed. This is a method for manufacturing an in-mold label container, which forms the tubular portion with the slide mold.

As described above, according to the present invention, it is possible to provide an in-mold label container that can be reclosed, a method for producing the same, and a container with a lid.

FIG. 1 is a side view showing a container with a lid according to the first embodiment of the present invention. FIG. 2 is a side sectional view showing an in-mold label container. FIG. 3 is a top view showing the in-mold label container shown in FIG. FIG. 4 is an enlarged view showing an injection molding die around the flange portion of the in-mold label container. FIG. 5 is a side sectional view showing the lid body. FIG. 6 is a flowchart showing a manufacturing method of an in-mold label container. FIG. 7 is a developed view showing the outer shape of the in-mold label. FIG. 8A is a diagram showing a method for manufacturing an in-mold label container. FIG. 8B is a diagram showing a method for manufacturing an in-mold label container. FIG. 8C is a diagram showing a method of manufacturing an in-mold label container. FIG. 8D is a diagram showing a manufacturing method of an in-mold label container. FIG. 9 is an enlarged side sectional view showing a container with a lid according to a modified example of the present invention.

Embodiment of the invention

<First Embodiment of the Invention>
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a side view showing a container with a lid, and FIG. 2 is a side sectional view showing an in-mold label container. Further, FIG. 3 is a top view of the in-mold label container shown in FIG.

Further, FIG. 4 is an enlarged view showing an injection molding die around a flange portion of the in-mold label container, FIG. 5 is a side sectional view showing a lid, and FIG. 6 is a flowchart showing a manufacturing method of the in-mold label container. FIG. 7 is a developed view showing the outer shape of the in-mold label.

First, the container with a lid 10A according to the present invention will be described with reference to FIG.

The container with a lid 10A according to the present invention includes a cylindrical in-mold label container 10 obtained by injecting an injection resin onto the label surface, and a lid 20 attached to the in-mold label container 10.

Of these, the lid 20 has a top surface portion 21, a side surface portion 22 provided on the lower peripheral edge of the top surface portion 21, and an internal screw (inner fitting portion) 25 provided on the inner peripheral surface of the side surface portion. (See FIGS. 1 and 5).

In the present embodiment, "upper", "upper end", "lower", and "lower end" mean that the container with lid 10A is placed with the bottom 4 of the container with lid 10A facing downward as shown in FIG. In the case, it means "upper", "upper end", "lower", and "lower end".

As shown in FIGS. 1 to 4, the in-mold label container 10 of the container with a lid 10A is made of a cylindrical container obtained by injecting an injection resin onto the surface of the in-mold label 6. That is, the in-mold label container 10 has a body portion 1, a flange portion 2 provided at the upper end of the body portion 1, a bottom portion 4 provided at the lower end of the body portion 1, and a leg provided on the peripheral edge of the bottom portion 4 and projecting downward. It has a part 3.

Of these, the body portion 1 has an injection resin 5 (on the inner peripheral surface side) forming the inner peripheral surface of the body portion 1 and an in-mold label (simply on the outer peripheral surface side) forming the outer peripheral surface of the body portion 1. It also has a label) 6.

Further, eight stack ribs 8 are provided below the injection resin 5 of the body portion 1.

Further, from the inner end of the flange portion 2 upward, the tubular portion 11 is provided inside the side surface portion 22 of the lid body 20, and the internal screw (inner fitting portion) of the lid body 20 is provided on the outer peripheral surface of the tubular portion 11. ) 25 is provided with an external screw (outer fitting portion) 15.

Further, the flange portion 2, the bottom portion 4, the leg portion 3, and the tubular portion 11 are an injection molding die (simply) including a cavity 31 described later, a core 32 composed of a lower core 32a and an upper core 32b, and a slide mold 33. It has an injection resin 5 obtained by injecting an injection resin into a mold) 30. Further, a stripper plate 34 that can move in the vertical direction with respect to the upper core 32b is attached to the upper core 32b of the core 32.

By the way, the external screw 15 of the tubular portion 11 has a double-threaded screw structure, and correspondingly, the internal screw 25 of the lid 20 also has a double-threaded screw structure. Therefore, by fitting the side surface portion 22 of the lid body 20 into the tubular portion 11 of the in-mold label container 10 and tightening the lid body 20, the internal screw 25 and the external screw 15 are engaged with each other, and the in-mold label container 10 is engaged. Can be sealed by the lid 20.

Further, in the outer peripheral surface of the tubular portion 11, a circumferential groove 13 is formed at the end portion on the flange portion 2 side. The circumferential groove 13 of the tubular portion 11 is formed by an inner protrusion 35 provided in a circumferential shape on the inner peripheral surface of the slide mold 33, which will be described later.

By providing the inner protrusion 35 on the slide mold 33 in this way, the in-mold label 6 provided in advance on the inner peripheral surface of the cavity 31 attaches the flange portion 2 during injection molding using the injection molding mold 30. It does not move upwards through it (see Figure 4).

That is, at the time of injection molding, the injection resin is injected from the bottom 4 side of the in-mold label container 10 into the injection molding mold 30 into which the in-mold label 6 is inserted. At this time, the injection resin rises in the space inside the injection molding die 30 and pushes up the in-mold label 6 so as to shift it upward. However, since the slide mold 33 is provided with the inner protrusion 35, the in-mold label 6 comes into contact with the inner protrusion 35, and the upward movement is restricted. Therefore, the body 1 of the in-mold label container 10 can be reliably covered with the in-mold label 6 from the bottom 4 to the flange 2, and the gas barrier characteristics of the in-mold label container 10 can be reliably maintained. Further, in the in-mold label container 10, the arrangement position of the in-mold label 6 can always be stabilized.

As described above, the circumferential groove 13 is formed on the flange 2 side end of the outer peripheral surface of the cylinder 11, so that the flange 2 side end of the cylinder 11 is thin (for example, 1.5 mm thick). ), And the buckling strength in the vertical direction decreases. Therefore, a plurality of, for example, 12 reinforcing ribs 14 (thickness 1.0 mm) are provided in the circumferential groove 13 in order to increase the buckling strength in the vertical direction.

Next, the injection resin 5 and the in-mold label 6 will be described.

As the material of the injection resin forming the injection resin 5, a synthetic resin such as polyethylene, polyethylene terephthalate, polystyrene, or polypropylene can be used.

Next, the in-mold label 6 will be described with reference to FIG. As shown in FIG. 7, the in-mold label 6 has a fan shape, and the lower corners of both ends 6a and 6b of the in-mold label 6 are notched.

As shown in FIGS. 2 and 4, the length of the label 6 in the height direction preferably slightly protrudes into the flange portion 2 above the body portion 1 and reaches about the middle portion of the leg portion 3 below. Further, as shown in FIG. 7, the length of the in-mold label 6 in the circumferential direction is such that a gap 6A having a width of about 0.6 to 1.5 mm is formed between the abutting both ends 6a and 6b. It is preferably as long as it occurs. By forming such an in-mold label 6, the in-mold label 6 is inserted into a predetermined position of the cavity 31 of the injection molding die 30 and fixed by vacuum suction, and the cavity 31, the core 32 and the slide mold 33 are molded. When the injection resin is injected from the gate at the center of the bottom of the cavity 31 after closing, the injection resin 5 is smoothly injected into the in-mold label 6 without causing defects such as overlapping parts, turning, and wrinkles. The in-mold label 6 and the injection resin 5 can be integrally molded.

Such an in-mold label 6 can be formed of a transparent laminated sheet, an aluminum foil, or an aluminum-deposited PET, but it is more desirable to have a gas barrier property. Further, in order to enhance the design, a printing layer such as a pattern or a character can be partially provided. As a typical configuration example of the laminated sheet used for the in-mold label 6, the following configuration can be mentioned.

(1) (Outside) Stretched polypropylene film (thickness 30 μm) / adhesive / stretched polyethylene terephthalate film (thickness 12 μm) / printing layer / adhesive / stretched polyethylene terephthalate film (thickness 12 μm) / inorganic oxide vapor deposition layer / adhesive / Stretched polypropylene film with heat sealability (thickness 30 μm)
(2) (Outside) Stretched polypropylene film (thickness 30 μm) ・ Printing layer / adhesive / stretched polyethylene terephthalate film (thickness 12 μm) ・ Inorganic oxide vapor deposition layer / adhesive / stretched polypropylene film with heat sealability (thickness 30 μm) )
(3) (Outside) Unstretched polypropylene film (thickness 30 μm) / adhesive / stretched polyethylene terephthalate film (thickness 12 μm) / printing layer / adhesive / stretched polyethylene terephthalate film (thickness 12 μm) / inorganic oxide vapor deposition layer / adhesion Agent / Unstretched polypropylene film (thickness 30 μm)
In addition to the above, various configurations can be adopted. It is preferable that the in-mold label 6 has as little curl as possible from the viewpoint of improving the yield during container molding. For that purpose, a film having a heat shrinkage ratio similar to that of the intermediate layer (a film of the same material) is laminated on both sides of the intermediate layer. However, it is preferable to have a layer structure in which both sides are symmetrical with the intermediate layer as the center. Further, the thickness of each film is shown as an example, and can be appropriately set depending on the dimensions of the container and the like.

In the laminated structure of (1) to (3) constituting the in-mold label 6, since the inner film is a film adhered to the injection resin 5, it is preferably made of the same material as the injection resin 5. The gas barrier layer is a thin-film vapor deposition layer of an inorganic oxide, and is formed by using a stretched polyethylene terephthalate film (thickness 12 μm) as a thin-film deposition base material and forming a transparent thin-film vapor deposition layer of the inorganic oxide on the surface thereof. As the inorganic oxide, as described above, alumina, silica, zinc oxide, magnesium oxide, ITO and the like can be used, and these can be made to a thickness of about 200 to 1000 Å by means such as thin film deposition, sputtering and ion plating. It can be deposited so as to be a vapor-deposited layer of inorganic oxide.

Such a vapor-deposited layer of an inorganic oxide may be formed by a single layer, but by forming it by a plurality of layers, more excellent gas barrier properties can be obtained. Further, in order to improve the adhesiveness of these vapor-deposited layers of inorganic oxides or prevent damage such as cracks and effectively exert excellent gas barrier properties, adhesiveness improving layers are provided on the upper and lower surfaces thereof. Reactive acrylic resin, polyurethane resin, acrylic resin containing silane coupling agent, water-soluble polymer containing metal alkoxide, ethylene-vinyl alcohol for the purpose of protective layer, gas barrier property improving layer, etc. A resin layer such as a copolymer can be provided to form a gas barrier layer as a composite layer.

In the configuration of the laminated sheet constituting the in-mold label 6, the adhesive between the films needs to have heat resistance because heat is applied together with the injection pressure of the polypropylene resin when the in-mold label 6 is in-molded. From this point of view, it is preferable to use a one-component or two-component reaction type polyurethane-based or acrylic-based adhesive and bond them by a dry laminating method.

For example, a two-component reaction type polyurethane adhesive contains a polyol component having a hydroxyl group at the polymer terminal and a polyisocyanate component having an isocyanate group as main components, and forms a urethane bond by the reaction of the hydroxyl group and the isocyanate group to cure. It is a thing.

As the polyol component of such a two-component reaction type polyurethane-based adhesive, a polyester polyol, a polyester polyurethane polyol, a polyether polyurethane polyol, or the like can be used. The polyisocyanate component includes isocyanate monomers such as tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tris (isocyanate phenyl), and methane-tris (isocyanate phenyl) thiophosphate, and tolylene diisocyanate and hexamethylene diisocyanate. Such as a urethane prepolymer in which an isocyanate monomer is added to trimethylolpropane, an isocyanate modified product such as hexamethylene diisocyanate burette, hexamethylene diisocyanate and isophorone diisocyanate trimmer can be used.

Examples of the one-component reaction type polyurethane adhesive include a prepolymer polyurethane adhesive having an isocyanate group at the end, for example, a polyether polyurethane polyisocyanate obtained by reacting a polyether polyol with a diisocyanate, or a reaction between a polyester polyol and a diisocyanate. Polyurethane polyisocyanate obtained by the above can be used.

Next, a method for manufacturing the in-mold label container 10 will be described with reference to FIGS. 6 and 8A to 8D.

First, as shown in FIG. 6, the in-mold label 6 is inserted into the inner peripheral surface of the cavity 31 of the injection molding die 30, and the in-mold label 6 is fixed on the inner peripheral surface of the cavity 31 by vacuum suction.

Next, as shown in FIG. 8A, the lower core 32a of the core 32 is mounted inside the cavity 31, and the slide mold 33 is mounted on the upper part of the cavity 31, and the core 32, the slide mold 33, and the stripper are mounted on the cavity 31. Mold the plate 34. Next, the injection resin is injected into the space between the cavity 31, the core 32, the slide mold 33, and the stripper plate 34 from the gate provided at the center of the bottom of the cavity 31. The injection resin moves from the bottom to the top in the space between the cavity 31, the core 32, the slide mold 33, and the stripper plate 34 (see FIG. 4). At this time, the in-mold label 6 is also pushed upward by the injection resin, but the in-mold label 6 comes into contact with the inner protrusion 35 of the slide mold 33 and does not move further upward.

Therefore, in the in-mold label container 10, the arrangement position of the in-mold label 6 can be stabilized, the arrangement position of the in-mold label container 10 is stabilized, and the in-mold label 6 makes the body of the in-mold label container 10 stable. 1 can be reliably covered from the bottom portion 4 to the flange portion 2, and the gas barrier characteristics of the in-mold label container 10 can be reliably maintained.

Next, in the injection molding die 30, the upper end portion of the in-mold label 6 is bent so as to expand outward, and the portion of the in-mold label 6 that is bent outward is formed into a flange portion 2 together with the injection resin.

During this time, the body 1 can be molded by the in-mold label 6 and the injection resin, and the bottom 4 can be molded by the injection resin.

Further, in the injection molding die 30, the injection resin moves further upward through the inner protrusion 35 of the slide mold 33 to mold the tubular portion 11.

In this way, the in-mold label container 10 can be molded by the injection molding die 30.

Next, as shown in FIG. 8B, the core 32, the slide mold 33, and the stripper plate 34 are pulled upward from the cavity 31 together with the in-mold label container 10. At this time, the in-mold label container 10 is held on the outer periphery of the lower core 32a of the core 32.

Next, as shown in FIG. 8C, the slide mold 33 of the injection molding mold 30 slides laterally with respect to the core 32 and the stripper plate 34, and the slide mold 33 separates from the core 32 and the stripper plate 34.

Then, as shown in FIG. 8D, the stripper plate 34 moves downward from the upper core 32b of the core 32 toward the in-mold label container 10. At this time, the in-mold label container 10 held on the outer periphery of the lower core of the core 32 can be pushed downward and taken out to the outside.

As described above, according to the present embodiment, the in-mold label container 10 can be easily and easily molded by injection molding.

When using the in-mold label container 10, the contents are taken out from the in-mold label container 10 and used. When not all the contents are taken out, the contents are left in the in-mold label container 10 and the side surface portion 22 of the lid 20 is fitted into the cylinder portion 11.

After that, by tightening the lid 20 to the in-mold label container 10, the external screw 15 and the internal screw 25 are engaged to easily and easily reseal (reclose) the in-mold label container 10. can.

<Modified example of the present invention>
Next, a modified example of the present invention will be described with reference to FIG.

In the above embodiment, an example is shown in which the cylinder portion 11 of the in-mold label container 10 is provided with an external screw 15 as an outer fitting portion, and the side surface portion 22 of the lid 20 is provided with an internal screw 25 as an inner fitting portion. However, the present invention is not limited to this, the tubular portion 11 is provided with an outer circumferential protrusion 17 as an outer fitting portion, the side surface portion 22 is provided with an inner circumferential protrusion 27 as an inner fitting portion, and the tubular portion 11 of the in-mold label container 10 is provided. The in-mold label container 10 may be sealed by the lid 20 by a plugging method in which the side surface 22 of the lid 20 is pressed and fitted from above.

In this case, the stopper structure is formed by the outer circumferential protrusion 17 of the tubular portion 11 and the inner circumferential protrusion 27 of the side surface portion 22.

Next, specific examples of the present invention will be described.

In the first embodiment shown in FIGS. 1 to 8A to 8D, water is put into the in-mold label container 10, and then the in-mold label container 10 is sealed by the lid 20 and the container with a lid 10A. Got Next, the container with a lid 10A was laid down sideways.

This was repeated 3 times, but in each case there was no water leakage.

Further, instead of putting water in the in-mold label container 10, sweets were put in, and the container 10A with a lid was laid down sideways in the same manner as when water was put in.

This was repeated 3 times, but in each case there was no leakage of sweets.

1 Body 2 Flange 3 Leg 4 Bottom 5 Injection resin 6 In-mold label 6a, 6b Both ends 8 Stack rib 10 In-mold label container 11 Cylinder 13 Circumferential groove 14 Reinforcing rib 15 External screw 17 Outer circumferential protrusion 20 Lid 21 Top surface 22 Side surface 25 Internal thread 27 Inner circumferential protrusion 30 Injection molding mold 31 Cavity 32 Core 32a Lower core 32b Upper core 33 Slide mold 34 Stripper plate 35 Inner protrusion

Claims (5)

A lid having a top surface portion, a side surface portion provided on the lower peripheral edge of the top surface portion, and an inner fitting portion provided on the inner peripheral surface of the side surface portion is attached, and an injection resin is applied to the label surface. In a cylindrical in-mold label container obtained by injection,
With the torso
A flange portion provided at the upper end of the body portion and
It is provided with a bottom portion provided at the lower end of the body portion.
The body portion has an injection resin portion forming an inner peripheral surface and a label forming an outer peripheral surface.
A tubular portion to be mounted inside the side surface portion is provided upward from the flange portion, and an outer fitting portion for fitting to the inner fitting portion of the lid body is provided on the outer peripheral surface of the tubular portion. ,
An in-mold label container in which a circumferential groove is formed at an end portion on the flange portion side of the outer peripheral surface of the tubular portion. The in-mold label container according to claim 1, wherein the outer fitting portion of the cylinder portion has a screw structure or a plug structure for fitting with the inner fitting portion of the lid body. The in-mold label container according to claim 1, wherein a plurality of reinforcing ribs extending in the vertical direction are provided in a circumferential groove formed on the outer peripheral surface of the tubular portion. A cylindrical in-mold label container obtained by injecting injection resin onto the label surface,
With the top surface
The side surface portion provided on the lower edge of the top surface portion and the side surface portion
It has an inner fitting portion provided on the inner peripheral surface of the side surface portion, and includes a lid body to be attached to the in-mold label container.
The in-mold label container has a body and
A flange portion provided at the upper end of the body portion and
It is provided with a bottom portion provided at the lower end of the body portion.
The body portion has an injection resin portion forming an inner peripheral surface and a label forming an outer peripheral surface.
A tubular portion to be mounted inside the side surface portion is provided upward from the flange portion, and an outer fitting portion for fitting to the inner fitting portion of the lid body is provided on the outer peripheral surface of the tubular portion. ,
A container with a lid having a circumferential groove formed on the flange side end of the outer peripheral surface of the cylinder. With the torso
A flange portion provided at the upper end of the body portion and
It is provided with a bottom portion provided at the lower end of the body portion.
The body portion has an injection resin portion forming an inner peripheral surface and a label forming an outer peripheral surface.
A cylindrical in-mold label container having a tubular portion provided upward from the flange portion and an outer fitting portion provided on the outer peripheral surface of the tubular portion using a mold containing a cavity and a core. In the manufacturing method of the in-mold label container to be manufactured,
The process of inserting the label on the inner peripheral surface of the cavity and
The process of mounting the core inside the cavity and mounting the slide mold that can slide in the lateral direction on the upper part of the cavity.
A step of injecting an injection resin so as to press the label against the inner peripheral surface of the cavity is provided in the space between the cavity, the core, and the slide mold.
The body is formed between the cavity and the core,
The flange portion is formed between the cavity and the slide mold, and the flange portion is formed.
The cylinder portion is formed between the core and the slide mold, and the cylinder portion is formed .
A method for manufacturing an in-mold label container, wherein the slide mold is provided with an inner protrusion forming a circumferential groove on the flange portion side end portion of the outer peripheral surface of the cylinder portion.

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