JP2022182983A - Composite container and manufacturing method thereof - Google Patents

Abstract

To provide a composite container and a manufacturing method of the same capable of improving shatter strength.SOLUTION: A composite container 10A comprises a resin container 10 having a shank 11 and a bottom part 20 provided below the shank 11 and a label member 40 provided outside the resin container 10 and covering at least a part of the shank 11. A lower edge 42 of the label member 40 is covered by the resin container 10, and the bottom part 20 comprises a first bottom part 21 coupled to the shank 11 and a second bottom part 22 provided more inward and downward in a radial direction than the first bottom part 21.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to composite containers and methods of manufacturing composite containers.

2. Description of the Related Art Conventionally, a container using a synthetic resin is known as a container for containing contents such as food (see, for example, Patent Document 1). In Patent Document 1, a cylindrical cardboard label having a large rigidity is adhered by an in-mold method to the body portion of a container body thermoformed from a synthetic resin sheet in the form of forming the leg portion, and then the exterior is assembled. However, a container with an in-mold label is disclosed in which the rigidity of the cardboard label effectively acts as the rigidity of the container.

Japanese Patent No. 4947516

However, in the case of the container disclosed in Patent Document 1, the cardboard label forms the legs, so there is a possibility that the cardboard label may get caught on the conveyer when the container is conveyed. Also, if the cardboard label is caught on the conveyor, the container may overturn on the conveyor. Then, when the containers are transferred on the transfer conveyor, there is a problem that work efficiency deteriorates. Therefore, there is a demand for a container that can improve drop strength with a simple structure.

The present disclosure has been made in consideration of such points, and an object of the present disclosure is to provide a composite container and a method for manufacturing a composite container that can improve drop strength.

A composite container according to one embodiment includes a resin container having a body portion and a bottom portion provided below the body portion, and a resin container provided outside the resin container to cover at least a portion of the body portion. a label member, the lower edge of the label member being covered with the resin container; and a second bottom provided below.

In one embodiment, the resin container may further have a flange provided above the body.

In one embodiment of the composite container, the bottom portion may further include a concave portion provided between the first bottom portion and the second bottom portion and recessed upward.

In the composite container according to one embodiment, the resin container may contain polyethylene terephthalate containing a biomass-derived component, or recycled polyethylene terephthalate.

In one embodiment, the label member may include paper.

In one embodiment of the composite container, the label member may contain polyethylene terephthalate.

In the composite container according to one embodiment, the label member may be provided with a cutting line for peeling and removing the label member from the resin container.

In the composite container according to one embodiment, ruled lines formed continuously or intermittently along the circumferential direction may be provided on the lower portion of the label member.

In the composite container according to one embodiment, the label member may be formed with a plurality of through holes penetrating through the label member in the thickness direction.

In the composite container according to one embodiment, the resin container may be a sheet molding.

A method for manufacturing a composite container according to one embodiment comprises a resin container having a body portion and a bottom portion provided below the body portion; In a method of manufacturing a composite container comprising a label member covering a part, the steps of preparing a cavity mold and a sheet pushing jig, mounting the label member on the inner surface of the cavity mold, and mounting the label member on the inner surface of the cavity mold. forming the resin container from the sheet material by subjecting the sheet material to sheet molding using the cavity mold and the sheet pushing jig, wherein the lower edge of the label member is The composite container is covered with the resin container, and the bottom portion includes a first bottom portion connected to the body portion and a second bottom portion provided radially inward and below the first bottom portion. A method for manufacturing a container.

In the method of manufacturing a composite container according to one embodiment, in the step of attaching the label member to the inner surface of the cavity mold, the label member is formed into a tubular shape, and the lower edge of the label member and the inner surface of the cavity mold The label member may be attached to the inner surface of the cavity mold such that a gap is formed between the.

According to the present disclosure, the drop strength of the composite container can be improved.

FIG. 1 is a perspective view showing a composite container with a lid according to one embodiment. FIG. 2 is a vertical cross-sectional view showing a composite container according to one embodiment. FIG. 3 is a plan view showing a composite container according to one embodiment. FIG. 4 is a perspective view showing a composite container according to one embodiment. FIG. 5 is an enlarged view (an enlarged view corresponding to the portion V in FIG. 2) showing the composite container according to one embodiment. FIG. 6 is an exploded view showing the label member of the composite container according to one embodiment. FIG. 7 is a diagram showing a method of manufacturing a composite container according to one embodiment. FIG. 8 is a diagram showing a method of manufacturing a composite container according to one embodiment. FIG. 9 is a diagram showing a method of manufacturing a composite container according to one embodiment. FIG. 10 is a cross-sectional view explaining the action of the composite container according to one embodiment. FIG. 11 is a partial vertical sectional view showing a modification of the composite container according to one embodiment. FIG. 12 is an enlarged view (an enlarged view corresponding to section XII in FIG. 11) showing a modification of the composite container according to one embodiment. FIG. 13 is a plan view showing another modification of the composite container according to one embodiment. FIG. 14 is an exploded view showing a modification of the label member of the composite container according to one embodiment. FIG. 15 is an exploded view showing another modified example of the label member of the composite container according to one embodiment. FIG. 16 is an exploded view showing another modified example of the label member of the composite container according to one embodiment. FIG. 17 is a perspective view showing a modified example of the composite container according to one embodiment. FIG. 18 is an exploded view showing another modification of the label member of the composite container according to one embodiment. FIG. 19 is a partial vertical sectional view showing a composite container of Comparative Example in Examples.

Hereinafter, this embodiment will be described with reference to the drawings. 1 to 10 are diagrams showing this embodiment. Each figure shown below is shown typically. Therefore, the size and shape of each part are appropriately exaggerated for easy understanding. In addition, it is possible to modify and implement as appropriate without departing from the technical idea. In addition, in each figure shown below, the same code|symbol is attached|subjected to the same part and detailed description may be partially abbreviate|omitted. In addition, numerical values such as dimensions and material names of each member described in this specification are examples as an embodiment, and are not limited to these, and can be appropriately selected and used. In this specification, terms specifying shapes and geometrical conditions, such as parallel, orthogonal, and perpendicular terms, not only have strict meanings but also include substantially the same states. In this specification, the terms "upper" and "lower" respectively refer to the upper and lower sides when the composite container 10A is erected (FIG. 1).

In addition, in this specification and drawings, unless otherwise specified, when a plurality of steps are disclosed for a method such as a manufacturing method, other undisclosed steps may be included between the disclosed steps. may be implemented. Also, the order of the disclosed steps is arbitrary as long as there is no contradiction.

Composite Container with Cover As shown in FIG. 1, the composite container with cover 1 includes a composite container 10A and a cover 50 for sealing the composite container 10A. Here, first, the composite container 10A will be described.

Composite Container As shown in FIGS. 1 to 3, a composite container 10A comprises a cup-shaped resin container 10 and a label member 40 provided outside the resin container 10. As shown in FIG. In the present embodiment, the resin container 10 is a sheet molded body produced by sheet molding. The contents accommodated inside the resin container 10 are not particularly limited, and may be beverages, desserts, and the like.

(resin container)
Next, the resin container will be described in detail with reference to FIGS. 1 to 5. FIG. As shown in FIGS. 1 to 3 , the resin container 10 has a body portion 11 and a bottom portion 20 provided below the body portion 11 . Moreover, the resin container 10 may further have a flange portion 15 provided above the body portion 11 . An opening 12 is formed in such a resin container 10, and the content is filled into the composite container 10A through the opening 12, and the content filled in the composite container 10A is taken out from the opening 12. It is designed to be

The body portion 11 of the resin container 10 has a cylindrical shape whose diameter gradually decreases from the upper side (the flange portion 15 side) toward the lower side (the bottom portion 20 side). However, the shape is not limited to this, and the trunk portion 11 may have a polygonal tubular shape such as a quadrangular tubular shape or an octagonal tubular shape.

As shown in FIG. 3, the bottom portion 20 has a generally circular shape in plan view. The diameter of the bottom portion 20 may be, for example, 30 mm or more and 80 mm or less.

As shown in FIG. 3, the flange portion 15 has a substantially annular shape in plan view. The width (radial distance) of the flange portion 15 may be, for example, 2 mm or more and 5 mm or less. As shown in FIG. 2, the flange portion 15 horizontally protrudes laterally from the upper end of the body portion 11, and the upper surface of the flange portion 15 is flat. Further, the above-described opening 12 is formed inside the flange portion 15 .

The thickness T (see FIG. 2) of the flange portion 15 may be 0.5 mm or more and 2.0 mm or less. When the thickness T of the flange portion 15 is 0.5 mm or more, it is possible to suppress deterioration of the moldability of the resin container 10 and to suppress deterioration of the rigidity of the flange portion 15 . Therefore, when sealing the lid member 50 to the flange portion 15, it is possible to suppress the occurrence of a sealing failure. In addition, by removing the lid member 50 from the flange portion 15 , it is possible to suppress deterioration in the ease of opening the lid-equipped composite container 1 when opening the lid-equipped composite container 1 . In this specification, the thickness T of the flange portion 15 is an average value of thicknesses measured at five points located at the tip of the flange portion 15 and spaced apart from each other along the circumferential direction. Say. Here, the tip portion of the flange portion 15 refers to a region within 1.5 mm from the outer edge of the flange portion 15 in the radial direction in plan view. Also, the thickness T of the flange portion 15 can be measured using a micrometer (eg, BMD-25MX395-271 manufactured by Mitutoyo Corporation).

Here, as shown in FIGS. 4 and 5 , the bottom portion 20 includes a first bottom portion 21 connected to the body portion 11 and a second bottom portion 22 provided radially inward and below the first bottom portion 21 . and

Among these, the first bottom portion 21 plays a role of absorbing the impact when dropped. The first bottom portion 21 has a generally annular shape in plan view. As shown in FIG. 5 , the first bottom portion 21 horizontally protrudes radially inward from the lower end of the body portion 11 . Moreover, the lower surface of the 1st bottom part 21 is a flat surface. A width W1 (radial distance) of the flat surface may be, for example, 1 mm or more and 10 mm or less, and may be 5 mm as an example.

The second bottom portion 22 includes a ground portion 23 and a depression portion 24 provided radially inward of the ground portion 23 . Among these, the grounding portion 23 is a portion that abuts on a reference surface S such as a table. The ground portion 23 is formed over the entire area of the bottom portion 20 in the circumferential direction.

An annular outer wall surface 25 is formed on the outer periphery of the grounding portion 23 . The outer wall surface 25 extends to reach the first bottom portion 21 in a vertical cross section. Further, the outer wall surface 25 is curved so as to protrude downward in a vertical cross section. In this case, the outer wall surface 25 may have an arc shape in vertical section. The curvature radius R of the outer wall surface 25 may be, for example, 0.5 mm or more and 10 mm or less, and may be 5 mm as an example. Also, the height H1 of the outer wall surface 25 (the vertical distance from the reference surface S to the lower surface of the first bottom portion 21) may be, for example, 1 mm or more and 10 mm or less, and may be 5 mm as an example.

The depressed portion 24 includes an inclined surface 24a formed on the inner circumference of the ground contact portion 23 and a top surface 24b connected to the inclined surface 24a. Of these, the inclined surface 24a is inclined upward as it goes radially inward in the vertical cross section. The inclination angle θ1 of the inclined surface 24a with respect to the reference surface S may be, for example, 5° or more and 60° or less, and may be 20° as an example. Also, the height H2 of the inclined surface 24a (the vertical distance from the reference surface S to the top surface 24b) may be, for example, 1 mm or more and 10 mm or less, and may be 2 mm as an example. The top surface 24b extends horizontally in the vertical cross section.

Gate marks are not present on the bottom surface 20a of the bottom portion 20 as described above. That is, the resin container 10 according to the present embodiment is produced by sheet molding as described above. For this reason, the bottom surface 20a of the bottom portion 20 of the resin container 10 is not formed with gate traces that are formed on resin products produced by, for example, injection molding or injection blow molding. As a result, when the resin container 10 is dropped, it is possible to prevent the bottom portion 20 of the resin container 10 from being damaged due to the gate mark, which is a so-called gate crack. Therefore, the drop strength of the bottom portion 20 of the resin container 10 can be improved. Further, since there is no gate mark on the bottom surface 20a of the bottom portion 20, there is no restriction on the printing position when characters or the like are printed on the bottom portion 20. FIG. Furthermore, since there is no gate mark on the bottom surface 20a of the bottom portion 20, it is possible to prevent the resin container 10 from being caught on the conveyer when the composite container 10A is conveyed. In this specification, the term "gate mark" refers to the injection of resin material into the space between the male and female dies when a resin product is produced by injection molding using the male and female dies. It means traces such as unevenness formed on the resin product due to the gate for the purpose.

Thermoplastic resins such as polyethylene terephthalate (PET), polypropylene (PP), and polystyrene (PS) can be used as the sheet material of the resin container 10 . The resin container 10 may be colored in red, blue, yellow, green, brown, black, white, or the like, but is preferably colorless and transparent in consideration of ease of recycling. From the viewpoint of recycling, it is preferable to use colorless and transparent polyethylene terephthalate as the material of the resin container 10 . Further, the resin container 10 may contain polyethylene terephthalate containing a biomass-derived component or recycled polyethylene terephthalate. As a result, the environmental load can be reduced. The sheet thickness may be 0.5 mm or more and 3 mm or less, and may be 1.2 mm as an example.

Such a resin container 10 may be, for example, a container with a full filling capacity of 50 ml or more and 1000 ml or less. Further, the height H of the resin container 10 (vertical distance from the reference surface S to the upper surface of the flange portion 15, see FIG. 2) may be 50 mm or more and 200 mm or less.

(Label material)
Next, the label member 40 will be described with reference to FIGS. 1 to 6. FIG. Here, FIG. 6 is an exploded view showing the label member 40. As shown in FIG. This label member 40 serves to increase the rigidity of the composite container 10</b>A including the resin container 10 by reinforcing the thinned body portion 11 .

As shown in FIGS. 1 to 5, the label member 40 covers the body portion 11 of the resin container 10. As shown in FIGS. Since the label member 40 covers the trunk portion 11, the thinned trunk portion 11 is not crushed when the composite container 10A is gripped. In addition, since the label member 40 covers the body 11, when the user holds the composite container 10A, the heat of the contents inside the composite container 10A is less likely to be transferred to the user's hand. In this embodiment, the label member 40 covers only a portion of the body portion 11 . Note that the label member 40 may cover the entire region of the body portion 11 . Since the label member 40 covers the entire body portion 11 in this manner, the rigidity of the composite container 10A can be more effectively increased.

In the illustrated example, the upper edge 41 and the lower edge 42 of the label member 40 are each covered with the resin container 10 . Since the upper edge 41 and the lower edge 42 of the label member 40 are covered with the resin container 10 in this manner, moisture permeates into the label member 40 from the upper edge 41 and the lower edge 42 of the label member 40. It can be suppressed. Therefore, it is possible to prevent the label member 40 from being wetted by moisture that has permeated inside, or from being swollen. Moreover, when the label member 40 contains paper, it is possible to prevent the paper of the label member 40 from peeling off. As described above, the label member 40 covers only a portion of the body portion 11 of the resin container 10 . Therefore, in the illustrated example, the upper edge 41 and the lower edge 42 of the label member 40 are each covered with the body portion 11 of the resin container 10 .

Further, the label member 40 is provided with a cutting line 45 (see FIG. 1) for peeling and removing the label member 40 from the resin container 10 . As a result, when the label member 40 and the resin container 10 are recycled, the label member 40 and the resin container 10 can be easily separated, and the recyclability can be improved. Moreover, even when the label member 40 and the resin container 10 are discarded, the label member 40 and the resin container 10 can be discarded separately. This cutting line 45 may be formed in the shape of perforations, for example. In other words, the cutting line 45 may be formed so that a penetrating portion penetrating the label member 40 and a non-penetrating portion not penetrating the label member 40 are linearly arranged alternately. For example, a zipper-like shape may be used as long as the label member 40 can be cut.

As shown in FIG. 6, the label member 40 has a sector shape when the label member 40 is unfolded.

Regarding the length of the label member 40 in the circumferential direction, the width between the butted side edges 43 is 0.5 mm or more and 2.0 mm or less when the both side edges 43 are butted and attached to a cavity mold 60 described later. It is preferable that the length is such that a gap of a certain degree is generated. By forming the label member 40 in this manner, the label member 40 can be inserted into the cavity mold 60 without difficulty, and when the sheet material is subjected to sheet molding, the label member 40 is free from overlapping portions, curling, wrinkles, etc. can be suppressed from occurring.

Such label members 40 may include paper. Also, the label member 40 may contain polyethylene terephthalate. When the label member 40 contains paper, the paper includes board paper such as coated board, card paper, ivory paper, base paper for cups, milk carton paper, drawing paper, Kent paper, corrugated cardboard, and so-called synthetic paper and various plastics. Laminated laminated paper/composite paper may be used, and functional paper imparted with functions such as water resistance and oil resistance may be used. Also, special paper using materials other than pulp, such as a mixture of limestone and plastic, may be used. The basis weight of the paper to be used can be appropriately designed. For example, the paper used can have a basis weight of 50 g/m ² or more and 500 g/m ² or less, preferably 55 g/m ² or more and 215 g/m ² or less, As an example, one having a basis weight of 80 g/m ² can be used.

In addition, in order to enhance the design, the label member 40 may be printed with patterns, characters, and the like in advance. In this way, since the label member 40 is previously printed with a pattern or the like, it is possible to omit the printing process after forming the sheet. Thereby, the manufacturing time of the composite container 10A can be shortened. In addition, since the printing process after sheet molding can be omitted, it is not necessary to increase the thickness of the resin container 10 in order to suppress printing defects. Therefore, the thickness of the resin container 10 can be reduced, and the amount of resin used for the resin container 10 can be reduced.

Note that the label member 40 may be a resin laminate film having a desired layer structure, or may be so-called synthetic paper in which plastic and inorganic matter are mixed.

Specifically, as the label member 40, for example, a film having the following layer structure can be used.

(1) (Inside) Heat-sealable stretched polypropylene layer (HSOPP) 25 µm/aluminum foil 7 µm/stretched polypropylene layer (OPP) 25 µm (outside)
(2) (Inside) Heat-sealable stretched polypropylene layer (HSOPP) 25 μm/VM-PET12/stretched polypropylene layer (OPP) 25 μm (outside)
(3) (Inside) Heat sealing agent coating/Oriented polypropylene layer (OPP) 25 μm/Aluminum foil 7 μm/Oriented polypropylene layer (OPP) 25 μm (Outside)

Lid Material Next, the lid material 50 will be described.

The lid member 50 is made of a resin film. As shown in FIG. 1, the lid member 50 has a substantially circular shape in plan view, and is sealed to the flat upper surface of the flange portion 15 of the resin container 10 over the entire circumference. As the lid member 50, for example, a laminate having the following layer structure can be used.

(Outside) Polyethylene terephthalate film (PET) 12 μm/Nylon film (Ny) 15 μm/Polyethylene terephthalate film (PET) 30 μm or more and 60 μm or less (Inside)

As the material of the lid member 50, it is preferable to use a resin material capable of developing a so-called easy peel property. Each of the above layers is formed by a dry lamination method, an extrusion lamination method, an extrusion coating method, or other coating method according to a conventional method.

Method for Manufacturing Composite Container and Method for Manufacturing Composite Container with Lid Next, the operation of the present embodiment having such a configuration will be described. Here, the manufacturing method of the composite container 10A and the manufacturing method of the lid-attached composite container 1 will be described with reference to FIGS. 7 to 9. FIG.

First, the label member 40 is prepared. At this time, first, for example, court ball, card paper, ivory paper, or the like is punched into a predetermined shape. As a result, the label member 40 in the unfolded state is produced (see FIG. 6).

Also, a cavity mold 60 and a sheet pushing jig 61 are prepared.

Next, as shown in FIG. 7, the label member 40 is attached to the inner surface of the cavity mold 60 . At this time, the label member 40 is mounted on the inner surface of the cavity mold 60 so that the label member 40 is cylindrical and a gap g is formed between the lower edge 42 of the label member 40 and the inner surface of the cavity mold 60. do. In this case, first, the label member 40 is formed into a tubular shape so that both side edges 43 of the label member 40 face each other. Next, the tubular label member 40 is mounted on the inner surface of the cavity mold 60 . A suction hole 62 is formed in the cavity mold 60 , and the label member 40 is attached to the cavity mold 60 by sucking air through the suction hole 62 . At this time, a gap g is formed between the lower edge 42 of the label member 40 and the inner surface of the cavity mold 60 . By forming the gap g in this way, the label member 40 can be inserted into the cavity mold 60 without difficulty. It is possible to suppress the occurrence of defects such as

Next, as shown in FIGS. 8 and 9, the sheet material 10a is subjected to sheet molding by means of a cavity mold 60 to which the label member 40 is attached and a sheet pressing jig 61, whereby the resin is removed from the sheet material 10a. A manufacturing container 10 is produced.

At this time, first, the sheet material 10a is sufficiently heated by a sheet forming heater (not shown) until the sheet material 10a becomes flexible enough to be formed into a sheet.

The sheet material 10a is then laminated onto the label member 40. As shown in FIG. At this time, first, the sufficiently heated sheet material 10a is placed above the label member 40, as shown in FIG. The sheet material 10 a is then pushed into the cavity mold 60 by the sheet pushing jig 61 .

Then, the sheet material 10a is pushed into the cavity mold 60 by the sheet pushing jig 61, and the sheet material 10a is pressed against the label member 40 as shown in FIG. In this manner, the sheet material 10a is subjected to sheet molding, and the resin container 10 is obtained from the sheet material 10a. Also, at this time, the resin container 10 obtained from the sheet material 10 a is brought into close contact with the label member 40 . At this time, air may be sucked from the suction holes 62 and the sheet material 10 a may be sucked onto the label member 40 . After that, the composite container 10A is obtained by punching out the flange into a predetermined shape with a Thomson blade or the like.

Moreover, the lid member 50 is prepared in parallel with the production of the composite container 10A. At this time, a predetermined laminate is produced by a dry lamination method or the like. After that, the lid member 50 is manufactured by punching out the laminate into a predetermined shape with a knife or the like.

Next, the composite container 10A is filled with contents, and the composite container 10A is sealed with the lid member 50 . When sealing the composite container 10</b>A with the lid member 50 , first, the lid member 50 is placed on the flange portion 15 of the resin container 10 . Next, the lid member 50 is sealed to the flange portion 15 by a hot sealing plate or the like (not shown). At this time, the air in the resin container 10 may be replaced with, for example, nitrogen gas.

In this manner, the composite container 1 with a lid, which includes the composite container 10A and the lid 50 that seals the composite container 10A, is obtained.

Here, in the composite container 10A according to the present embodiment, the lower edge 42 of the label member 40 is covered with the resin container 10. As shown in FIG. In other words, the resin container 10 covers the lower edge 42 of the label member 40 . For this reason, in the vicinity of the portion covering the lower edge 42 of the label member 40 in the resin container 10, there may be a portion where the resin container 10 is difficult to elastically deform. Therefore, when a large force acts on the vicinity of the portion of the resin container 10 that covers the lower edge 42 of the label member 40, the force cannot be released, and the resin container 10 may be damaged. There is

In contrast, in the present embodiment, the bottom portion 20 of the resin container 10 includes a first bottom portion 21 connected to the body portion 11 and a second bottom portion 21 provided radially inward and below the first bottom portion 21 . a bottom portion 22; This allows the first bottom portion 21 to absorb impact when dropped. For example, when the composite container 10A falls on the ground G as shown in FIG. 10, the second bottom 22 may collide with the ground G. In this way, when the second bottom portion 22 collides with the ground G, the impact is applied from the ground G to the second bottom portion 22 .

Here, when the impact applied to the second bottom portion 22 is transmitted to the first bottom portion 21, the first bottom portion 21 is elastically deformed so as to incline upward as it goes radially inward. As a result, the impact is absorbed by the first bottom portion 21 . Therefore, the vicinity of the portion of the resin container 10 that covers the lower edge 42 of the label member 40 can be prevented from being subjected to impact. That is, even if the second bottom portion 22 is subjected to an impact from the ground G, it is possible to prevent a large force from acting locally in the vicinity of the portion covering the lower edge 42 of the label member 40 . Therefore, it is possible to prevent the resin container 10 from being damaged in the vicinity of the portion covering the lower edge 42 of the label member 40 .

As described above, according to the present embodiment, the composite container 10A includes the resin container 10 having the body portion 11 and the bottom portion 20 provided below the body portion 11, and the resin container 10 provided outside the resin container 10. and a label member 40 covering at least a portion of the body portion 11 . Also, the lower edge 42 of the label member 40 is covered with the resin container 10 . The bottom portion 20 includes a first bottom portion 21 connected to the body portion 11 and a second bottom portion 22 provided radially inward and below the first bottom portion 21 . This allows the first bottom portion 21 to absorb impact when dropped. Therefore, the vicinity of the portion of the resin container 10 that covers the lower edge 42 of the label member 40 can be prevented from being subjected to impact. As a result, it is possible to prevent the resin container 10 from being damaged in the vicinity of the portion covering the lower edge 42 of the label member 40 .

Also, the lower edge 42 of the label member 40 is covered with the resin container 10 . This can prevent moisture from penetrating into the label member 40 from the lower edge 42 of the label member 40 . Therefore, it is possible to prevent the label member 40 from being wetted by moisture that has permeated inside, or from being swollen. Moreover, when the label member 40 contains paper, it is possible to prevent the paper of the label member 40 from peeling off. Therefore, it is possible to prevent the appearance of the composite container 10A from becoming poor.

Furthermore, since the lower edge 42 of the label member 40 is covered with the resin container 10, the label member 40 is not caught on the conveyer when the composite container 10A is conveyed. Therefore, the transportability of the composite container 10A is not deteriorated.

Moreover, according to the present embodiment, the resin container 10 further has the flange portion 15 provided above the body portion 11 . This makes it easier to seal the lid member 50 to the resin container 10 . Therefore, the sealing performance of the composite container 1 with lid can be improved.

Further, according to the present embodiment, the resin container 10 contains polyethylene terephthalate containing biomass-derived components or recycled polyethylene terephthalate. As a result, the environmental load can be reduced.

Further, according to this embodiment, the label member 40 includes paper. As a result, the paper can complement the rigidity of the container, so even when the amount of resin used in the resin container 10 is reduced, it is possible to prevent the rigidity of the composite container 10A from decreasing. Therefore, the amount of resin used for the composite container 10A can be reduced. Therefore, the environmental load can be reduced.

Further, according to the present embodiment, the label member 40 is provided with the cutting line 45 for peeling and removing the label member 40 from the resin container 10 . As a result, when the label member 40 and the resin container 10 are recycled, the label member 40 and the resin container 10 can be easily separated, and the recyclability can be improved. Moreover, even when the label member 40 and the resin container 10 are discarded, the label member 40 and the resin container 10 can be discarded separately.

Furthermore, according to the present embodiment, the resin container 10 is a sheet molding. This makes it possible to easily obtain the composite container 10A that is lightweight and excellent in productivity.

In addition, in this Embodiment mentioned above, although the resin-made container 10 showed the example which is a sheet|seat molding, it is not restricted to this. For example, the resin container 10 may be produced by other molding methods such as injection molding.

Further, in the present embodiment described above, the bottom portion 20 includes the first bottom portion 21 connected to the body portion 11 and the second bottom portion 22 provided radially inward and below the first bottom portion 21. I showed an example. In this case, as shown in FIGS. 11 and 12, the bottom portion 20 may further include a concave portion 26 provided between the first bottom portion 21 and the second bottom portion 22 and recessed upward.

As shown in FIG. 12, the recess 26 has a first inclined surface 26a extending from the first bottom portion 21, a top surface 26b connected to the first inclined surface 26a, and a second inclined surface 26c connected to the top surface 26b. contains. Of these, the first inclined surface 26a is inclined upward toward the radially inward direction in the vertical cross section. The inclination angle θ2 of the first inclined surface 26a with respect to the reference plane S may be, for example, 45° or more and 80° or less, and may be 70° as an example. Also, the height H3 of the first inclined surface 26a (the vertical distance from the lower surface of the first bottom portion 21 to the top surface 26b) may be, for example, 2 mm or more and 8 mm or less, and may be 3 mm as an example.

The top surface 26b extends horizontally in the vertical cross section. The width W2 (radial distance) of the top surface 26b may be, for example, 1 mm or more and 5 mm or less, and may be 2 mm as an example.

The second inclined surface 26c is inclined downward as it goes radially inward in the vertical cross section. The inclination angle θ3 of the second inclined surface 26c with respect to the reference plane S may be, for example, 45° or more and 80° or less, and may be 70° as an example. The second inclined surface 26 c is connected to the outer wall surface 25 provided on the outer periphery of the ground contact portion 23 .

In this modification, the width W1 of the lower surface (flat surface) of the first bottom portion 21 may be, for example, 1 mm or more and 5 mm or less, and may be 2 mm as an example. Moreover, the height H1 of the outer wall surface 25 may be, for example, 1 mm or more and 10 mm or less, and may be 2 mm as an example.

According to this modification, the bottom portion 20 further includes a concave portion 26 provided between the first bottom portion 21 and the second bottom portion 22 and recessed upward. Thereby, the concave portion 26 and the first bottom portion 21 absorb the impact when dropped. That is, the impact when dropped is absorbed by the concave portion 26 and the first bottom portion 21 . For example, although not shown, when the composite container 10A falls on the ground G, the second bottom 22 may collide with the ground G. In this way, when the second bottom portion 22 collides with the ground G, the impact is applied from the ground G to the second bottom portion 22 .

Here, since the concave portion 26 is provided between the first bottom portion 21 and the second bottom portion 22 so as to be concave upward, when the impact applied to the second bottom portion 22 is transmitted to the concave portion 26, the concave portion 26 However, for example, the top surface 26b of the concave portion 26 is elastically deformed so as to incline upward as it goes radially inward. As a result, the impact is absorbed by the concave portion 26 . Moreover, when the recessed part 26 cannot absorb the impact, the impact applied to the recessed part 26 is transmitted to the first bottom part 21, and the first bottom part 21 is elastically deformed as described above. As a result, the impact is absorbed by the first bottom portion 21 .

Therefore, according to this modification, even if the second bottom portion 22 is subjected to an impact from the ground G, a large force locally acts on the vicinity of the portion covering the lower edge 42 of the label member 40. It is possible to more effectively suppress what is done. Therefore, it is possible to more effectively prevent the resin container 10 from being damaged in the vicinity of the portion covering the lower edge 42 of the label member 40 .

Moreover, in this Embodiment mentioned above, the label member 40 showed the example which covered the trunk|drum 11 of the resin-made containers 10. As shown in FIG. In this case, as shown in FIGS. 13 and 14, ruled lines 46 continuously formed along the circumferential direction may be provided in the lower portion of the label member 40 . In the illustrated example, two ruled lines 46 are provided on the bottom of the label member 40 . These ruled lines 46 extend along the circumferential direction and are provided over the entire circumference.

The position where the ruled line 46 is provided is preferably an area within 10 mm upward from the lower edge 42 of the label member 40 . As a result, when the composite container 10A drops to the ground G, the area near the ruled line 46 of the label member 40 can absorb the impact of the drop. Such ruled lines 46 may be formed by, for example, embossing.

According to this modified example, ruled lines 46 are formed continuously along the circumferential direction at the bottom of the label member 40 . As a result, when the composite container 10A falls on the ground G, the area near the ruled line 46 of the label member 40 can be deformed. Therefore, the impact when dropped can be absorbed by the area near the ruled line 46 . Therefore, the vicinity of the portion of the resin container 10 that covers the lower edge 42 of the label member 40 can be prevented from being subjected to impact. As a result, it is possible to prevent the resin container 10 from being damaged in the vicinity of the portion covering the lower edge 42 of the label member 40 . Note that the ruled lines 46 formed continuously (or intermittently) along the circumferential direction are provided in the lower part of the label member 40 in this way, so that the resin container 10 is damaged. The fact that this can be suppressed will be explained with reference to Examples described later.

Although an example in which the ruled lines 46 extend along the circumferential direction has been shown, the present invention is not limited to this. For example, as shown in FIG. 15 , the ruled line 46 may be formed to extend vertically when the label member 40 is provided outside the resin container 10 . In this case, a plurality of ruled lines 46 may be intermittently formed along the circumferential direction. Each ruled line 46 is preferably formed at regular intervals along the circumferential direction. The pitch of the ruled lines 46 may be, for example, 2 mm or more and 10 mm or less. Further, as shown in FIG. 16, the ruled line 46 may be formed so as to extend along a direction inclined with respect to the vertical direction when the label member 40 is provided on the outside of the resin container 10. . In the illustrated example, the ruled lines 46 are formed so as to extend parallel to each other when the label member 40 is provided outside the resin container 10 . Furthermore, each ruled line 46 does not have to extend along the same direction. For example, each ruled line 46 may be formed so that the inclination angle with respect to the vertical direction is different from each other when the label member 40 is provided on the outside of the resin container 10 . Although not shown, when the label member 40 is provided on the outside of the resin container 10, ruled lines extending along the circumferential direction, ruled lines extending along the vertical direction, and ruled lines extending in the vertical direction At least two types of ruled lines among the ruled lines extending along the label member 40 may be formed. Even in these cases, the impact at the time of dropping can be absorbed by the area near the ruled line 46 . Therefore, it is possible to prevent the resin container 10 from being damaged in the vicinity of the portion covering the lower edge 42 of the label member 40 .

Moreover, in this Embodiment mentioned above, the label member 40 showed the example which covered the trunk|drum 11 of the resin-made containers 10. As shown in FIG. In this case, as shown in FIGS. 17 and 18, the label member 40 may be formed with a plurality of through holes 47 penetrating the label member 40 in the thickness direction. Each through-hole 47 serves as an air vent for removing air between the label member 40 and the sheet material 10a when the sheet material 10a is laminated on the label member 40. As shown in FIG. Each through-hole 47 may have a substantially circular shape when viewed from the front, and the diameter of each through-hole 47 may be, for example, 0.1 mm or more and 1 mm or less. The positions where the through-holes 47 are provided are preferably separated from the upper edge 41, the lower edge 42 and the side edges 43 of the label member 40 by 2 mm or more. The pitch of the through-holes 47 may be, for example, 2 mm or more and 10 mm or less in the vertical direction and the circumferential direction.

According to this modification, the label member 40 is formed with a plurality of through holes 47 penetrating the label member 40 in the thickness direction. Thereby, when the sheet material 10a is laminated on the label member 40, the air between the label member 40 and the sheet material 10a can be removed. This allows the sheet material 10 a to be effectively pressed against the label member 40 . Therefore, the adhesion between the resin container 10 obtained from the sheet material 10a and the label member 40 can be improved.

Next, specific examples in the above embodiment will be described.

(Example 1)
First, the composite container 10A shown in FIG. 2 was produced. At this time, the sheet material of the resin container 10 was polyethylene terephthalate, and the sheet thickness was 1.2 mm.

Card paper with a basis weight of 80 g/m ² was used as the label member 40 .

(Drop test)
A drop test was then performed. At this time, first, the resin container 10 of the composite container 10A was filled with water up to a position 10 mm below the flange. After that, the composite container 10A was sealed with a lid member 50 to produce a composite container 1 with a lid member.

Next, the lid-equipped composite container 1 was stored in a constant temperature bath set to a low temperature for 24 hours or more, and then dropped onto a concrete ground while the lid-equipped composite container 1 was erected. At this time, the composite container 1 with lid material was dropped from a height of 50 cm from the ground. Moreover, the dropping was carried out within 5 minutes after taking out the composite container 1 with lid material from the constant temperature bath. Then, the composite container 1 with lid material was repeatedly dropped on the ground until the resin container 10 was damaged.

(Example 2)
A drop test was performed in the same manner as in Example 1, except that a label member 40 formed with ruled lines 46 (hereinafter also referred to as horizontal ruled lines) shown in FIG. 14 was used.

(Example 3)
A drop test was performed in the same manner as in Example 1, except that a label member 40 formed with ruled lines 46 (hereinafter also referred to as vertical ruled lines) shown in FIG. 15 was used.

(Example 4)
A drop test was performed in the same manner as in Example 1, except that a label member 40 formed with ruled lines 46 (hereinafter also referred to as diagonal ruled lines) shown in FIG. 16 was used.

(Comparative example)
A drop test was conducted in the same manner as in Example 1, except that a composite container 10B shown in FIG. 19 was produced. That is, a drop test was performed in the same manner as in Example 1, except that a resin container 10b having a flat bottom portion 20b that did not include the first bottom portion 21 and the second bottom portion 22 was produced. At this time, the sheet material of the resin container 10b was polyethylene terephthalate, and the sheet thickness was 1.2 mm.

Table 1 shows the above results.

As a result, when the lid-attached composite container according to the comparative example was dropped for the first time, the vicinity of the portion mainly covering the lower edge 42 of the label member 40 of the resin container 10b was broken, and the lid-attached composite container was broken. , there was a water leak caused by the destruction.

On the other hand, in the lid-equipped composite containers 1 according to Examples 1 to 4, water leakage from the resin container 10 could not be confirmed in the first drop. That is, even when the composite container 1 with lid material was dropped once, the resin container 10 was not destroyed. In particular, in the composite container 1 with a lid member according to Example 2, even when the composite container 1 with a lid member was dropped twice, the resin container 10 was not destroyed, and the lids according to Examples 3 and 4 did not break. In the material-attached composite container 1, even when the lid-attached composite container 1 was dropped four times, the resin container 10 was not destroyed. As described above, it was found that the composite container 1 with lid according to the present embodiment can improve the drop strength.

The present disclosure is not limited to the above-described embodiment and modifications as they are, and can be embodied by modifying constituent elements without departing from the gist of the present disclosure at the implementation stage. Also, various inventions can be formed by appropriate combinations of the plurality of constituent elements disclosed in the above embodiment and modifications. Some components may be deleted from all the components shown in the embodiment and each modification.

REFERENCE SIGNS LIST 10 resin container 10a sheet material 10A composite container 11 body 15 flange 20 bottom 21 first bottom 22 second bottom 26 recess 40 label member 42 lower edge 45 cutting line 46 ruled line 47 through hole 60 cavity mold 61 sheet pushing jig

Claims (12)

a resin container having a body and a bottom provided below the body;
A label member provided outside the resin container and covering at least a portion of the body,
a lower edge of the label member is covered with the resin container;
The bottom is
a first bottom connected to the body;
and a second bottom located radially inward and below the first bottom. The composite container according to claim 1, wherein said resin container further has a flange portion provided above said body portion. The composite container according to claim 1 or 2, wherein the bottom portion further includes a concave portion provided between the first bottom portion and the second bottom portion and recessed upward. The composite container according to any one of claims 1 to 3, wherein the resin container contains polyethylene terephthalate containing a biomass-derived component or recycled polyethylene terephthalate. 5. A composite container according to any preceding claim, wherein the label member comprises paper. 5. The composite container according to any one of claims 1 to 4, wherein the label member comprises polyethylene terephthalate. The composite container according to any one of claims 1 to 6, wherein the label member is provided with a cutting line for peeling and removing the label member from the resin container. 8. The composite container according to any one of claims 1 to 7, wherein ruled lines formed continuously or intermittently along the circumferential direction are provided on the lower portion of the label member. The composite container according to any one of claims 1 to 8, wherein the label member is formed with a plurality of through-holes extending through the label member in the thickness direction. The composite container according to any one of claims 1 to 9, wherein the resin container is a molded sheet. Manufacture of a composite container comprising a resin container having a body and a bottom provided below the body, and a label member provided outside the resin container and covering at least a portion of the body in the method
preparing a cavity mold and a sheet pushing jig;
attaching the label member to the inner surface of the cavity mold;
a step of forming the resin container from the sheet material by subjecting the sheet material to sheet molding using the cavity mold fitted with the label member and the sheet pushing jig;
a lower edge of the label member is covered with the resin container;
The bottom is
a first bottom connected to the body;
and a second bottom provided radially inward and below the first bottom. In the step of attaching the label member to the inner surface of the cavity mold, the label member is formed into a tubular shape, and the label member is formed so that a gap is formed between the lower edge of the label member and the inner surface of the cavity mold. 12. The method of manufacturing a composite container according to claim 11, wherein the label member is attached to the inner surface of a cavity mold.

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