JP2022175465A - Composite preform and its manufacturing method - Google Patents

Abstract

To provide a composite container having a function of preventing release of carbon dioxide gas in a content liquid or a function of further enhancing heat insulation.SOLUTION: A composite container 10A includes a container body 10, and a plastic member 40 provided outside the container body 10. A space 60 is formed by filling air 60a between the container body 10 and the plastic member 40.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to composite preforms and methods of making same.

2. Description of the Related Art In recent years, plastic bottles have become popular as bottles for containing liquids such as food and drink, and liquids are contained in such plastic bottles.

A plastic bottle containing such a content liquid is manufactured by inserting a preform into a mold and biaxially stretching and blow-molding it.

By the way, in the conventional biaxial stretch blow molding method, for example, a preform containing a single-layer material such as PET or PP, a multi-layer material, or a blend material is used to form a container shape. However, in conventional biaxial stretch blow molding processes, it is common to simply mold the preform into a container shape. Therefore, when various functions and properties (barrier properties, heat retention, etc.) are to be imparted to the container, the means for doing so are limited, for example, by changing the material constituting the preform. In particular, it is difficult to give different functions and characteristics to different parts of the container (for example, the body and the bottom). For this reason, a technique has been developed in which a plastic member having various functions is provided outside the preform and the preform and the plastic member are integrally blow-molded to manufacture a composite container.

JP 2015-128858 A

In the composite container having such a structure, when the content liquid contains carbon dioxide gas, a function to prevent the carbon dioxide gas in the content liquid from being released to the outside, or a function to further improve heat insulation is required.

The present disclosure has been made in consideration of such points, and provides a composite preform having a function of preventing the release of carbon dioxide gas in the content liquid or a function of increasing heat insulation, and a method for manufacturing the same. With the goal.

The present disclosure provides a composite container comprising a container body made of a plastic material and a plastic member provided in close contact so as to surround the outside of the container body, wherein the container body and the plastic member are blow The composite container is integrally expanded by molding, a space is formed between the container body and the plastic member, and the space is filled with a fluid.

In the present disclosure, the container body has a mouth portion, a neck portion, a shoulder portion, a trunk portion, and a bottom portion, and the plastic member comprises at least the shoulder portion, the trunk portion, and the bottom portion of the container body. The composite container is provided so as to cover the container body, and the space is formed between at least the body portion of the container body and the plastic member.

The present disclosure is a composite container, wherein the space extends from the bottom periphery of the container body to a boundary between the body and the shoulder.

The present disclosure is a composite container, wherein the space extends from the bottom periphery of the container body to the neck.

The present disclosure is a composite container in which a portion of the plastic member corresponding to the bottom portion is provided with a fluid filling opening.

The present disclosure is a composite container, wherein the fluid is gas.

The present disclosure is a composite container, wherein the fluid is air.

The present disclosure is a composite container in which the container body is filled with a content liquid containing carbon dioxide gas, and the fluid is carbon dioxide gas.

The present disclosure provides a method of manufacturing a composite container, in which a preform made of a plastic material is prepared, and a plastic member is provided so as to surround the outside of the preform. and a plastic member provided in close contact with the preform of the composite preform by blow-molding the composite preform in a blow-molding mold. , and expanding the plastic member as one to form a container body and a plastic member provided in close contact so as to surround the container body; and between the container body and the plastic member. and filling the container with a fluid.

According to the present invention, the composite container can have the function of preventing the release of carbon dioxide gas in the content liquid or the function of enhancing heat insulation.

1 is a partial vertical sectional view showing a composite container after being filled with air according to an embodiment of the present disclosure; FIG. FIG. 2 is a horizontal cross-sectional view (cross-sectional view taken along the line II-II in FIG. 1) showing the composite container according to the embodiment of the present disclosure; FIG. 3 is a partial vertical cross-sectional view showing a composite container before air filling according to an embodiment of the present disclosure; 4 is a horizontal cross-sectional view (cross-sectional view along line IV-IV in FIG. 3) showing the composite container according to the embodiment of the present disclosure; FIG. 5 is a vertical sectional view showing a composite preform; FIG. 6 is a perspective view showing a plastic member; FIG. 7A is a diagram showing a blow molding method; FIG. 7B is a diagram showing a blow molding method; FIG. 7C is a diagram showing a blow molding method; FIG. 7D is a diagram showing a blow molding method; FIG. 7E is a diagram showing a blow molding method; FIG. 7F is a diagram showing a blow molding method; FIG. 8 is a perspective view showing the composite container after being filled with air according to the embodiment of the present disclosure; FIG. 9 is a perspective view showing a composite container before being filled with air according to an embodiment of the present disclosure; FIG. 10 is a diagram showing a space between a container body and a plastic member; FIG. 11 is a side view of a composite container prior to being filled with air according to a variation of the present disclosure; FIG. 12 is a perspective view showing the bottom of a composite container prior to filling with air according to a variation of the present disclosure; FIG. 13 is a side view showing a composite container after being filled with air according to a modification of the present disclosure; FIG. 14 shows a composite container according to a further variation of the present disclosure;

<Embodiment>
A first embodiment of the present disclosure will be described below with reference to the drawings. 1 to 10 are diagrams showing the first embodiment of the present disclosure.

First, the outline of the composite container according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 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).

The composite container 10A shown in FIGS. 1 and 2 is biaxially stretched against a composite preform 70 (see FIG. 5) including the preform 10a and the plastic member 40a using a blow molding die 50, as will be described later. It is obtained by expanding the preform 10a of the composite preform 70 and the plastic member 40a integrally by blow molding.

Such a composite container 10A comprises an inner container body 10 made of a plastic material and a plastic member 40 provided in close contact with the outside of the container body 10 . Further, a space 60 is formed between the container body 10 and the plastic member 40, and the space 60 is filled with a fluid such as gas such as air.

The container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a body portion 20 provided below the shoulder portion 12, and a body portion 20. and a bottom portion 30 provided below.

In addition, the plastic member 40 is closely attached to the outer surface of the container body 10 in a thinly extended state, and is so closely attached to the container body 10 that it does not move or rotate easily.

At least a portion of the plastic member 40 may be translucent or transparent. In this case, the container body 10 can be viewed from the outside through the translucent or transparent portion. The plastic member 40 may be entirely translucent or transparent, or may have an opaque portion and a translucent or transparent portion (for example, window). In this embodiment, an example in which the entire plastic member 40 is transparent will be described.

Next, the container main body 10 will be described in detail. The container body 10 has the mouth portion 11, the neck portion 13, the shoulder portion 12, the body portion 20, and the bottom portion 30 as described above.

Of these, the mouth portion 11 has a threaded portion 14 to be screwed onto a cap (not shown) and a flange portion 17 provided below the threaded portion 14 . In addition, the shape of the mouth portion 11 may be a conventionally known shape.

The neck portion 13 is located between the flange portion 17 and the shoulder portion 12 and has a substantially cylindrical shape with a substantially uniform diameter. The shoulder portion 12 is positioned between the neck portion 13 and the body portion 20 and has a shape whose diameter gradually increases from the neck portion 13 side toward the body portion 20 side.

Furthermore, the trunk portion 20 has a cylindrical shape with a substantially uniform diameter as a whole. However, the shape is not limited to this, and the trunk portion 20 may have a polygonal tubular shape such as a quadrangular tubular shape or an octagonal tubular shape. Alternatively, the body 20 may have a cylindrical shape with a non-uniform horizontal cross-section from top to bottom. Moreover, in the present embodiment, the trunk portion 20 has no irregularities and has a substantially flat surface, but the surface is not limited to this. For example, the body portion 20 may be formed with unevenness such as panels or grooves.

On the other hand, the bottom portion 30 has a recess 31 located in the center and a grounding portion 32 provided around the recess 31 . The shape of the bottom portion 30 is also not particularly limited, and may have a conventionally known bottom portion shape (for example, a petaloid bottom shape, a round bottom shape, or the like). Further, the bottom portion 30 is provided outside the ground portion 32 and has a bottom peripheral edge 33 forming a boundary with the trunk portion 20 .

The thickness of the container body 10 at the trunk portion 20 is not limited to this, but can be made as thin as about 50 μm to 250 μm, for example. Furthermore, the weight of the container body 10 is not limited to this, but can be 10 g to 20 g. By reducing the wall thickness of the container body 10 in this way, the weight of the container body 10 can be reduced.

Such a container body 10 can be produced by biaxially stretching blow molding a preform 10a (described later) produced by injection molding a synthetic resin material. As the material of the preform 10a, that is, the container body 10, it is preferable to use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), and PEN (polyethylene naphthalate).

Further, the container body 10 can also be formed as a multi-layer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer is made of MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), PEN (polyethylene naphthalate), etc., with gas barrier properties and light shielding properties. A multilayer bottle having gas barrier properties and light shielding properties may be formed by extruding a preform 10a having three or more layers as a resin (intermediate layer), followed by blow molding.

In addition, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foamed preform having a foamed cell diameter of 0.5 to 100 μm is formed, and this foamed preform is blow-molded. Thus, the container body 10 may be produced. Since such a container body 10 incorporates foam cells, the light shielding property of the entire container body 10 can be enhanced.

Such a container body 10 may be made of a bottle with a full filling capacity of 150 ml to 1500 ml, for example.

Next, the plastic member 40 will be described. The plastic member 40 (40a) is provided so as to surround the outside of the container body 10, as will be described later, and is integrally formed with the preform 10a by biaxial stretch blow molding.

The plastic member 40 is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is thinly stretched on the outer surface of the container body 10 to cover the container body 10 . As shown in FIG. 2, the plastic member 40 is provided over the entire circumference of the container body 10 so as to surround it, and has a substantially circular horizontal cross section.

In this case, the plastic member 40 is provided so as to cover the shoulder portion 12 , body portion 20 and bottom portion 30 of the container body 10 excluding the mouth portion 11 and neck portion 13 . Thereby, desired functions and characteristics can be imparted to the shoulder portion 12, the body portion 20 and the bottom portion 30 of the container body 10. FIG. In the present embodiment, an opening 45 is formed in a portion of the plastic member 40 corresponding to the concave portion 31 of the bottom portion 30, and this opening 45 is used when filling air 60a into the space 60 as described later. be done.

Such a plastic member 40 may be one that does not have a contracting action with respect to the preform 10a, or one that has a contracting action. In the latter case, the plastic member 40 itself may be contractible or elastic and capable of contracting without external action. Alternatively, the plastic member 40 may shrink (for example, heat shrink) with respect to the preform 10a when an external action (for example, heat) is applied.

The thickness of the plastic member 40 is not limited to this, but can be, for example, about 50 μm to 500 μm when attached to the container body 10 .

Next, referring to FIG. 5, the configuration of the composite preform according to this embodiment will be described.

As shown in FIG. 5, the composite preform 70 includes a plastic material preform 10a and a bottomed cylindrical plastic member 40a provided in close contact with the outside of the preform 10a.

Among them, the preform 10a includes a mouth portion 11a, a trunk portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the trunk portion 20a. Of these, the mouth portion 11 a corresponds to the mouth portion 11 of the container body 10 described above, and has substantially the same shape as the mouth portion 11 . The trunk portion 20a corresponds to the neck portion 13, the shoulder portion 12 and the trunk portion 20 of the container body 10 described above, and has a substantially cylindrical shape. The bottom portion 30a corresponds to the bottom portion 30 of the container body 10 described above, and has a substantially hemispherical shape.

On the other hand, the plastic member 40a is attached to the outer surface of the preform 10a without being adhered, and is in close contact with the preform 10a so as not to move or rotate. The plastic member 40a surrounds the preform 10a over its entire circumferential direction and has a substantially circular horizontal cross section.

In this case, the plastic member 40a is provided so as to cover the entire area of the trunk portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10, and the bottom portion 30a. An opening 45 is formed in a portion of the plastic member 40a corresponding to the concave portion 31 of the bottom portion 30. As shown in FIG.

Such a plastic member 40a may be one that does not contract with respect to the preform 10a, or one that contracts.

Examples of the plastic member 40a include polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, Polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluorine resin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, Ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6, nylon 6,6, nylon MXD6, aromatic polyamide, polycarbonate, ethylene polyethylene terephthalate, butylene terephthalate, ethylene polynaphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyether sulfone, silicone resin, polyurethane, phenolic resin, urea resin, polyethylene oxide , polybrovylene oxide, polyacetal, epoxy resin, and the like. Of these, it is preferable to use thermoplastic non-elastic resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). A blend material, a multilayer structure, or a partially multilayer structure may also be used. In addition, by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, a foamed member having a foamed cell diameter of 0.5 to 100 μm is used, and this foamed preform is molded. , the light-shielding property can be enhanced.

Also, the plastic member 40a may be made of the same material as the container body 10 (preform 10a). In this case, it is possible to selectively increase the strength of the portion of the composite container 10A, for example, by placing the plastic member 40 intensively in the portion where the strength is desired to be increased. For example, a plastic member 40 may be provided around the shoulder portion 12 and around the bottom portion 30 of the container body 10 to increase the strength of these portions. Examples of such materials include thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), and PEN (polyethylene naphthalate).

Further, the plastic member 40a may be made of a material having gas barrier properties such as oxygen barrier properties or water vapor barrier properties. In this case, the gas barrier properties of the composite container 10A can be improved without using a multi-layered preform or a preform containing a blend material as the preform 10a, and deterioration of the liquid content due to oxygen or water vapor can be prevented. For example, the shoulder portion 12, the neck portion 13, the body portion 20 and the bottom portion 30 of the container body 10 may be provided with plastic members 40 to enhance the gas barrier properties of these portions. Such materials may be PE (polyethylene), PP (polypropylene), MXD-6 (nylon), or these materials mixed with an oxygen absorber such as a fatty acid salt.

Further, the plastic member 40a may be made of a material having light barrier properties such as ultraviolet rays. In this case, the light barrier property of the composite container 10A can be improved without using a multi-layered preform or a preform containing a blend material as the preform 10a, and deterioration of the content liquid due to ultraviolet rays or the like can be prevented. For example, the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container body 10 may be provided with plastic members 40 to enhance the UV barrier properties of these portions. Such a material may be a blend material or a material obtained by adding a light-shielding resin to PET, PE, or PP. Also, a foamed member having a foamed cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, may be used.

Further, the plastic member 40a may be made of a material (a material with a low thermal conductivity) that has higher heat retention or cold insulation than the plastic material that constitutes the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. This enhances the heat retention or cold retention of the composite container 10A. For example, the container main body 10 may be provided with a plastic member 40 to enhance the thermal insulation or cold insulation of the body 20 . Moreover, when the user grips the composite container 10A, it is possible to prevent the composite container 10A from being difficult to hold due to being too hot or too cold. Such materials include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. Also, a foamed member having a foamed cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, may be used.

Further, the plastic member 40a may be made of a material that is less slippery than the plastic material that constitutes the container body 10 (preform 10a). In this case, the composite container 10A can be easily gripped by the user without changing the material of the container body 10 . For example, the body 20 of the container body 10 may be entirely or partially provided with a plastic member 40 to make the body 20 easier to hold.

Further, the plastic member 40a may be pre-designed or printed. For example, character information such as the name of the content liquid, the manufacturer, the name of raw materials, etc. may be described in addition to the design, product name, and the like.

Next, the shape of the plastic member 40a will be described.

As shown in FIGS. 5 and 6, the plastic member 40a has a bottomed cylindrical shape as a whole, and may have a cylindrical trunk portion 41 and a bottom portion 42 connected to the trunk portion 41. . In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, various functions and characteristics can be imparted to the bottom portion 30 in addition to the body portion 20 of the composite container 10A. 5 and 6, an opening 45 is formed in the center of the bottom portion 42 of the plastic member 40a.

Next, a method for manufacturing a composite preform will be described.

First, a preform 10a made of plastic material is prepared (see FIG. 7A). In this case, for example, the preform 10a may be produced by an injection molding method using an injection molding machine (not shown).

Next, a plastic member 40a is provided outside the preform 10a. Thus, a composite preform 70 having the preform 10a and the plastic member 40a adhered to the outside of the preform 10a is produced (see FIG. 7B). In this case, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical trunk portion 41 and a bottom portion 42 connected to the trunk portion 41. The bottom portion 42 has an opening 45 formed therein. . The plastic member 40a is attached so as to cover the entire area of the body portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a excluding the opening 45. As shown in FIG. At least a part of the plastic member 40a may be translucent or transparent.

At this time, a plastic member 40a having an inner diameter equal to or slightly smaller than the outer diameter of the preform 10a may be pushed into the preform 10a so as to be brought into close contact with the outer surface of the preform 10a. Alternatively, a heat-shrinkable plastic member 40a may be provided on the outer surface of the preform 10a, and the plastic member 40a may be heat-shrunk by heating to 50° C. to 100° C. to adhere to the outer surface of the preform 10a. good.

In this way, the plastic member 40a is brought into close contact with the outside of the preform 10a in advance to produce the composite preform 70, thereby producing a series of steps (FIGS. 7A to 7B) for producing the composite preform 70; A series of steps (FIGS. 7C to 7F) for manufacturing the composite container 10A by blow molding can be performed at a separate location (factory, etc.).

The composite preform 70 is then heated by the heating device 51 (see FIG. 7C). At this time, the composite preform 70 is evenly heated in the circumferential direction by the heating device 51 while rotating with the opening 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90.degree. C. to 130.degree.

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow mold 50 (see FIG. 7D).

The composite container 10A is molded using this blow molding die 50. As shown in FIG. In this case, the blow-molding mold 50 is composed of a pair of split body molds 50a and 50b and a bottom mold 50c (see FIG. 7D). In FIG. 7D, the pair of body molds 50a and 50b are open from each other, and the bottom mold 50c is raised upward. In this state, the composite preform 70 is inserted between the pair of body molds 50a and 50b.

Next, as shown in FIG. 7E, after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the blow sealed by the pair of body molds 50a and 50b and the bottom mold 50c is closed. A molding die 50 is constructed. Next, air is forced into the preform 10a and the composite preform 70 is subjected to biaxial stretch blow molding.

As a result, the container body 10 is obtained from the preform 10a in the blow molding die 50. As shown in FIG. During this time, the body molds 50a, 50b are heated to 30°C to 80°C, and the bottom mold 50c is cooled to 5°C to 25°C. At this time, in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded together. As a result, the preform 10 a and the plastic member 40 a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50 .

Thus, a composite container 10A comprising the container body 10 and the plastic member 40 provided on the outer surface of the container body 10 is obtained.

Next, as shown in FIG. 7F, the pair of body molds 50a and 50b and the bottom mold 50c are separated from each other, and the composite container 10A is removed from the blow molding mold 50 (FIGS. 3, 4 and 9). ).

In this manner, air 60a is jetted from the air nozzle 75 between the container body 10 and the plastic member 40 to the composite container 10A.

Specifically, air 60a is jetted from the air nozzle 75 through the opening 45 provided in the bottom portion 42 of the plastic member 40 to the composite container 10A shown in FIGS. The air 60a injected from the air nozzle 75 enters the bottom portion 42 of the plastic member 40, and then the air 60a flows from the bottom peripheral edge 33 between the bottom portion 30 and the body portion 20 of the container body 10 to the body portion 20 of the container body 10. sent outside. The air 60a sent to the outside of the barrel portion 20 of the container body 10 in this way stretches the plastic member 40, and the air 60a sent to the outside of the barrel portion 20 creates a space 60 between the barrel portion 20 and the plastic member 40. is formed, and the space 60 is filled with air 60a.

Thus, a space 60 is formed between the body portion 20 of the container body 10 and the plastic member 40, and the composite container 10A is obtained in which the space 60 is filled with air (FIGS. 1, 2 and 3). See Figure 8).

Here, FIG. 8 is a perspective view showing the composite container 10A in which the space 60 between the body 20 of the container body 10 and the plastic member 40 is filled with air, and FIG. 20 is a perspective view showing the composite container 10A before the space between the plastic member 40 and the plastic member 40 is filled with air. FIG.

FIG. 10 shows a composite container 10A in which air is filled in a space 60 between the body 20 of the container body 10 and the plastic member 40, and the space between the container body 10 and the plastic member 40. 60 is a diagram showing 60. FIG.

In the present embodiment, the air 60a injected into the plastic member 40 through the opening 45 of the plastic member 40 flows from the bottom peripheral edge 33 between the bottom 30 and the body 20 of the container body 10 to the container body 10. is sent to the outside of the body portion 20 of the Next, the air 60a sent to the outside of the body 20 rises outside the body 20 and reaches the shoulder peripheral edge 12a forming the boundary between the shoulder 12 and the body 20. Stop.

During this time, the air 60a injected into the plastic member 40 through the opening 45 can effectively separate the plastic member 40 from the bottom peripheral edge 33 and enter the outside of the barrel 20. As shown in FIG. After the air 60a enters the outer side of the barrel 20 from the bottom rim 33, the plastic member 40 is tightly adhered to the bottom rim 33 again to seal the space between the bottom rim 33 and the plastic member 40. As shown in FIG.

In this embodiment, the radius of curvature of the bottom peripheral edge 33 of the container body 10 is 5 mm to 12 mm. In this case, if the radius of curvature of the bottom peripheral edge 33 is 12 mm or more, the sealing performance between the bottom peripheral edge 33 and the plastic member 40 is degraded.

On the other hand, if the radius of curvature of the bottom peripheral edge 33 is less than 5 mm, the air 60a cannot enter between the body 20 of the container body 10 and the plastic member 40, and the space between the body 20 and the plastic member 40 will remain. 60 cannot be formed.

Above the barrel 20, the space between the shoulder peripheral edge 12a and the plastic member 40 is sealed, so that a space 60 formed between the container body 10 and the plastic member 40 is formed above the shoulder. It is sealed between the peripheral edge 12a and the plastic member 40 and below between the bottom peripheral edge 33 and the plastic member 40 .

As described above, according to this embodiment, the space 60 is formed between the body portion 20 of the container body 10 and the plastic member 40, and the space 60 is filled with the air 60a. In this case, since the air 60a filled between the body 20 and the plastic member 40 has excellent heat insulating properties, even when the container main body 10 of the composite container 10A is filled with the high-temperature content liquid, , the composite container 10A can be gripped via the plastic member 40 without problems.

The space 60 between the body 20 of the container body 10 and the plastic member 40 is sealed between the shoulder peripheral edge 12a and the plastic member 40 and between the bottom peripheral edge 33 and the plastic member 40. Therefore, the air 60a in the space 60 does not leak outward, and the space 60 can be maintained by the air 60a for a long time.

In the above-described embodiment, the space 60 between the body 20 of the container body 10 and the plastic member 40 is filled with air 60a. of gas such as argon may be filled in the space 60 . Argon is a stable inert gas and has a lower thermal conductivity than air. Therefore, the heat insulating effect of the space 60 can be increased. Alternatively, the space 60 may be filled with liquid (for example, carbonated liquid) instead of gas. By filling the space 60 with the carbonated liquid in this way, when the container main body 10 of the composite container 10A is filled with the carbon dioxide-containing content liquid as described later, the carbon dioxide-containing internal solution in the container main body 10 It is possible to suppress the decrease in the carbon dioxide gas concentration of the

<Modification>
Next, modifications according to the present disclosure will be described with reference to FIGS. 11 to 13. FIG.

11 to 13, the plastic member 40 provided on the outside of the container body 10 covers the neck 13, shoulder 12, body 20 and bottom 30 of the container body 10. The configuration is substantially the same as the embodiment shown in FIGS. 11 to 13, the same parts as those in the embodiment shown in FIGS. 1 to 10 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 11 and 12, a container body 10 and a plastic member 40 covering the neck portion 13, shoulder portion 12, body portion 20 and bottom portion 30 of the container body 10 are provided by blow molding. A composite container 10A is obtained. In this case, the container body 10 of the composite container 10A has a bottom portion 30 having a concave portion 31, a grounding portion 32, and a bottom peripheral edge 33, and a portion of the plastic member 40 corresponding to the center of the bottom portion 30 of the container body 10 is An opening 45 is formed.

Air is injected into the plastic member 40 from the air nozzle 75 through the opening 45 to the composite container 10A having such a structure (see FIG. 12).

Specifically, as shown in FIG. 13, air 60a is jetted from an air nozzle 75 (see FIG. 3) through an opening 45 provided in the bottom portion 42 of the plastic member 40 to the composite container 10A. Air 60a injected from the air nozzle 75 enters the bottom portion 42 of the plastic member 40, and then the air 60a is sent to the outside of the container body 10 from the bottom peripheral edge 33 between the bottom portion 30 and the body portion 20 of the container body 10. The air 60a sent to the outside of the container body 10 in this manner stretches the plastic member 40, and the air 60a sent to the outside of the container body 10 forms a space 60 between the container body 10 and the plastic member 40. At the same time, the space 60 is filled with air 60a.

Thus, a space 60 is formed between the container body 10 and the plastic member 40, and the composite container 10A in which the space 60 is filled with air is obtained (see FIG. 13).

Here, FIG. 13 shows a composite container 10A in which the space 60 between the body 20 of the container body 10 and the plastic member 40 is filled with air, while FIGS. 11 and 12 show the container body. 4 is a perspective view showing the composite container 10A before the space between 10 and the plastic member 40 is filled with air. FIG.

In this modification, the air 60a injected into the plastic member 40 through the opening 45 of the plastic member 40 flows from the bottom peripheral edge 33 between the bottom 30 and the body 20 of the container body 10 to the outside of the container body 10. Sent. Next, the air 60a sent to the outside of the container body 10 rises on the outside of the body 20, passes through the shoulder peripheral edge 12a forming the boundary between the shoulder 12 and the body 20, reaches the neck 13, and reaches the neck 13. stops at this neck 13 .

During this time, the air 60a injected into the plastic member 40 through the opening 45 can effectively separate the plastic member 40 from the bottom peripheral edge 33 and enter the outside of the barrel 20. As shown in FIG. After the air 60a enters the outer side of the barrel 20 from the bottom rim 33, the plastic member 40 is tightly adhered to the bottom rim 33 again to seal the space between the bottom rim 33 and the plastic member 40. As shown in FIG.

In this embodiment, the radius of curvature of the bottom peripheral edge 33 of the container body 10 is 5 mm to 12 mm. In this case, if the radius of curvature of the bottom peripheral edge 33 is 12 mm or more, the sealing performance between the bottom peripheral edge 33 and the plastic member 40 is degraded.

On the other hand, if the radius of curvature of the bottom peripheral edge 33 is less than 5 mm, the air 60a cannot enter between the body 20 of the container body 10 and the plastic member 40, and the space between the body 20 and the plastic member 40 will remain. 60 cannot be formed.

At the neck portion 13 above the body portion 20, the space between the neck portion 13 and the plastic member 40 is sealed. 13 and the plastic member 40 and below between the bottom rim 33 and the plastic member 40 .

As described above, according to this embodiment, the space 60 is formed between the container body 10 and the plastic member 40, and the space 60 is filled with the air 60a. In this case, since the air 60a filled between the body 20 and the plastic member 40 has excellent heat insulating properties, even when the container main body 10 of the composite container 10A is filled with the high-temperature content liquid, , the composite container 10A can be gripped via the plastic member 40 without problems.

Also, since the space 60 between the container body 10 and the plastic member 40 is sealed between the neck 13 and the plastic member 40 and between the bottom rim 33 and the plastic member 40, This space 60 can be maintained for a long time by the air 60a.

In the above embodiment, the space 60 between the container body 10 and the plastic member 40 is filled with the air 60a. Argon may be filled in space 60 . Argon is a stable inert gas and has a lower thermal conductivity than air. Therefore, the heat insulating effect of the space 60 can be increased. Alternatively, the space 60 may be filled with liquid (for example, carbonated liquid) instead of gas. By filling the space 60 with the carbonated liquid in this way, when the container main body 10 of the composite container 10A is filled with the carbon dioxide-containing content liquid as described later, the carbon dioxide-containing internal solution in the container main body 10 It is possible to suppress the decrease in the carbon dioxide gas concentration of the

Next, a further modified example according to the present disclosure will be described with reference to FIG.

In the modification shown in FIG. 14, a plastic member 40 provided outside the container body 10 covers the neck 13, shoulder 12, body 20 and bottom 30 of the container body 10. Filled with carbon dioxide. Other configurations are substantially the same as those of the embodiment shown in FIGS. In the modification shown in FIG. 14, the same parts as those of the embodiment shown in FIGS. 1 to 10 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 14, a composite container 10A comprising a container body 10 and a plastic member 40 provided by blow molding to cover a neck portion 13, a shoulder portion 12, a body portion 20 and a bottom portion 30 of the container body 10. is obtained. In this case, the container body 10 of the composite container 10A has a bottom portion 30 having a concave portion 31, a grounding portion 32, and a bottom peripheral edge 33, and a portion of the plastic member 40 corresponding to the center of the bottom portion 30 of the container body 10 is An opening 45 is formed (see FIG. 1).

Carbon dioxide gas is injected into the plastic member 40 through the opening 45 from the carbon dioxide nozzle 75A to the composite container 10A having such a structure.

Specifically, as shown in FIG. 14, the carbon dioxide gas 60b is jetted from the carbon dioxide nozzle 75A through the opening 45 provided in the bottom portion 42 of the plastic member 40 to the composite container 10A. The carbon dioxide gas 60b jetted from the carbon dioxide nozzle 75A enters the bottom portion 42 of the plastic member 40, and then the carbon dioxide gas 60b enters the container body 10 from the bottom peripheral edge 33 between the bottom portion 30 and the body portion 20 of the container body 10. sent outside. The carbon dioxide gas 60b sent to the outside of the container body 10 in this way stretches the plastic member 40, and the carbon dioxide gas 10b sent to the outside of the container body 10 forms a space 60 between the container body 10 and the plastic member 40. At the same time, the space 60 is filled with carbon dioxide gas 60b.

Thus, a space 60 is formed between the body 20 of the container body 10 and the plastic member 40, and the composite container 10A is obtained in which the space 60 is filled with carbon dioxide (see FIG. 14).

Here, FIG. 14 shows a composite container 10A in which the space 60 between the container body 10 and the plastic member 40 is filled with carbon dioxide gas 60b.

In this modified example, the carbon dioxide gas 60b jetted into the plastic member 40 through the opening 45 of the plastic member 40 flows from the bottom peripheral edge 33 between the bottom 30 and the body 20 of the container body 10 to the outside of the container body 10. sent to Next, the carbon dioxide gas 60b sent to the outside of the container body 10 rises on the outside of the body portion 20, passes through the shoulder peripheral edge 12a forming the boundary between the shoulder portion 12 and the body portion 20, reaches the neck portion 13, and reaches the neck portion 13. Gas 60b stops at this neck 13 .

During this time, the carbon dioxide gas 60b injected into the plastic member 40 through the opening 45 can effectively separate the plastic member 40 from the bottom peripheral edge 33 and enter the outside of the barrel 20. As shown in FIG. After the carbon dioxide gas 60b has entered the outside of the barrel 20 from the bottom peripheral edge 33, the plastic member 40 is brought into close contact with the bottom peripheral edge 33 again to seal the space between the bottom peripheral edge 33 and the plastic member 40. As shown in FIG.

In this embodiment, the radius of curvature of the bottom peripheral edge 33 of the container body 10 is 5 mm to 12 mm. In this case, if the radius of curvature of the bottom peripheral edge 33 is 12 mm or more, the sealing performance between the bottom peripheral edge 33 and the plastic member 40 is degraded.

On the other hand, if the radius of curvature of the bottom peripheral edge 33 is less than 5 mm, the air 60a cannot enter between the body 20 of the container body 10 and the plastic member 40, and the space between the body 20 and the plastic member 40 will remain. 60 cannot be formed.

At the neck portion 13 above the body portion 20, the space between the neck portion 13 and the plastic member 40 is sealed. 13 and the plastic member 40 and below between the bottom rim 33 and the plastic member 40 .

As described above, according to this modification, the space 60 is formed between the container body 10 and the plastic member 40, and the space 60 is filled with the carbon dioxide gas 60b. On the other hand, the container main body 10 is filled with the content liquid containing carbon dioxide. In this case, the carbon dioxide gas concentration filled in the space 60 is made higher than the carbon dioxide gas concentration of the solution inside the container body 10 . As a result, it is possible to prevent the carbon dioxide gas in the liquid content in the container body 10 from leaking to the outside, so that the carbon dioxide concentration of the liquid content in the container body 10 can be maintained.

Furthermore, since the carbon dioxide gas in the liquid content in the container body 10 tends to be in equilibrium with the carbon dioxide gas 60b in the space 60, the concentration of carbon dioxide gas in the liquid content in the container body 10 can be increased.

In addition, since the space 60 between the body 20 of the container body 10 and the plastic member 40 is sealed between the neck 13 and the plastic member 40 and between the bottom rim 33 and the plastic member 40, The carbon dioxide gas 60b in the space 60 does not leak outward, and the space 60 can be maintained by the carbon dioxide gas 60b for a long time.

10 container body 10A composite container 10a preform 11 mouth 11a mouth 12 shoulder 13 neck 20 body 20a body 30 bottom 30a bottom 31 recess 32 grounding part 33 bottom rim 40 plastic member 40a plastic member 45 opening 50 blow Mold 60 Space 60a Air 60b Carbon dioxide 70 Composite preform 75 Air nozzle

Claims (9)

In a composite container,
a container body made of plastic material;
A plastic member provided in close contact so as to surround the outside of the container body,
A composite container, wherein the container body and the plastic member are integrally expanded by blow molding, a space is formed between the container body and the plastic member, and the space is filled with a fluid. The container body has a mouth portion, a neck portion, a shoulder portion, a body portion and a bottom portion, and the plastic member is provided so as to cover at least the shoulder portion, the body portion and the bottom portion of the container body. 2. The composite container according to claim 1, wherein said space is formed between at least said body portion of said container body and said plastic member. 3. The composite container of claim 2, wherein said space extends from the bottom periphery of said container body to the boundary between said body and said shoulder. 3. The composite container of claim 2, wherein said space extends from the bottom periphery of said container body to said neck. 3. The composite container according to claim 2, wherein a portion of said plastic member corresponding to said bottom portion is provided with a fluid filling opening. 6. The composite container according to any one of claims 1 to 5, wherein said fluid is gas. 7. The composite container of claim 6, wherein said fluid is air. 7. The composite container according to claim 6, wherein said container body is filled with a content liquid containing carbon dioxide gas, and said fluid is carbon dioxide gas. In the method for manufacturing a composite container,
providing a preform made of plastic material;
providing a plastic member so as to surround the outside of the preform to produce a composite preform having the preform and a plastic member provided in close contact with the outside of the preform;
By subjecting the composite preform to blow molding in a blow molding mold, the preform of the composite preform and the plastic member are expanded together to surround the container body and the container body. molding a composite container having a plastic member in close contact with the
and filling a space between the container body and the plastic member with a fluid.

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