JP6921479B2 - Composite containers, composite preforms and plastic components - Google Patents

Description

The present invention relates to composite containers, composite preforms and plastic members.

Recently, plastic bottles have become common as bottles for containing the contents of foods and drinks, and such plastic bottles contain the contents.

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

By the way, in the conventional biaxial stretching blow molding method, a container shape is formed by using a preform containing, for example, a single layer material such as PET or PP, a multilayer material or a blend material. However, in the conventional biaxial stretching blow molding method, it is general that the preform is simply molded into a container shape. Therefore, when the container is to have various functions and properties (barrier property, heat retention property, etc.), the means thereof is limited, for example, changing the material constituting the preform. In particular, it is difficult to give different functions and characteristics depending on the part of the container (for example, the body and the bottom).

In the previous application (Japanese Unexamined Patent Publication No. 2015-128858), the applicant proposes a composite container provided with a container body and a plastic member capable of imparting various functions and characteristics to the container. doing.

Japanese Unexamined Patent Publication No. 2015-128858

The plastic member included in the composite container is required to have high transparency depending on the intended use. There is room for improvement in the transparency of the plastic member included in the composite container disclosed in Patent Document 1.
The present inventors have recently found that the transparency of a plastic member can be remarkably enhanced by using a plastic member provided with a layer containing a polypropylene resin as a main constituent component. The present invention is based on such findings.

Therefore, an object of the present invention is to provide a highly transparent plastic member, and a composite preform and a composite container provided with the same.

The composite container of the present invention
The container body made of plastic material and
A plastic member provided on the outer surface of the container body is provided.
The container body and the plastic member are integrally expanded by blow molding.
The plastic member is characterized by including a layer containing a polypropylene resin as a main constituent component.

In the above aspect, it is preferable that the plastic member is composed of multiple layers.

In the above aspect, it is preferable that the plastic member includes an inner surface layer, an intermediate layer, and an outer surface layer.

In the above aspect, it is preferable that the inner surface layer and the outer surface layer are layers containing polypropylene resin as a main constituent component.

In the above aspect, it is preferable that the intermediate layer contains, as a main component, a resin having a melting point of 20 ° C. or lower in absolute value of the difference from the melting point of the polypropylene resin.

In the above aspect, it is preferable that the intermediate layer contains an ethylene-vinyl alcohol copolymer resin as a main component.

In the above aspect, the polypropylene resin is preferably a random polypropylene resin.

The composite preform of the present invention
Preform made of plastic material and
A plastic member provided so as to surround the outside of the preform.
The plastic member is in close contact with the outside of the preform.
The plastic member is characterized by including a layer containing a polypropylene resin as a main constituent component.

In the above aspect, it is preferable that the plastic member is composed of multiple layers.

In the above aspect, it is preferable that the plastic member includes an inner surface layer, an intermediate layer, and an outer surface layer.

In the above aspect, it is preferable that the inner surface layer and the outer surface layer are layers containing polypropylene resin as a main constituent component.

In the above aspect, it is preferable that the intermediate layer contains, as a main component, a resin having a melting point of 20 ° C. or less, which is an absolute value of the difference from the melting point of the polypropylene resin.

In the above aspect, it is preferable that the intermediate layer contains an ethylene-vinyl alcohol copolymer resin as a main component.

In the above aspect, the polypropylene resin is preferably a random polypropylene resin.

The plastic member of the present invention
For producing a composite container having the preform and a plastic member in close contact with the outside of the preform by being mounted so as to surround the outside of the preform and being heated integrally with the preform. It is a plastic member
It has at least a tubular body that covers the body of the preform.
It is characterized by being provided with a layer containing a polypropylene resin as a main constituent component.

In the above aspect, it is preferable that the plastic member is composed of multiple layers.

In the above aspect, it is preferable that the plastic member includes an inner surface layer, an intermediate layer, and an outer surface layer.

In the above aspect, it is preferable that the inner surface layer and the outer surface layer are layers containing polypropylene resin as a main constituent component.

In the above aspect, it is preferable that the intermediate layer contains, as a main component, a resin having a melting point of 20 ° C. or less, which is an absolute value of the difference from the melting point of the polypropylene resin.

In the above aspect, it is preferable that the intermediate layer contains an ethylene-vinyl alcohol copolymer resin as a main component.

In the above aspect, the polypropylene resin is preferably a random polypropylene resin.

According to the present invention, it is possible to provide a highly transparent plastic member, and a composite preform and a composite container provided with the same.

FIG. 1 is a partial vertical sectional view showing a composite container according to the first embodiment of the present invention. FIG. 2 is a horizontal sectional view (FIG. II-II sectional view of FIG. 1) showing a composite container according to the first embodiment of the present invention. FIG. 3 is a vertical cross-sectional view showing a composite preform according to the first embodiment of the present invention. 4 (a) to 4 (d) are perspective views showing various plastic members. 5 (a) to 5 (f) are schematic views showing a blow molding method according to the first embodiment of the present invention. 6 (a) to 6 (f) are schematic views showing a blow molding method according to a modified example of the first embodiment of the present invention. 7 (a) to 7 (g) are schematic views showing a blow molding method according to a modified example of the first embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a modified example of the composite container according to the first embodiment of the present invention. FIG. 9 is a vertical cross-sectional view showing a modified example of the composite preform according to the first embodiment of the present invention. 10 (a) to 10 (f) are schematic views showing a modified example of the blow molding method according to the first embodiment of the present invention. FIG. 11 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 12 is a horizontal sectional view (XII-XII line sectional view of FIG. 11) showing a composite container according to a second embodiment of the present invention. FIG. 13 is a vertical cross-sectional view showing a composite preform according to a second embodiment of the present invention. 14 (a) to 14 (d) are perspective views showing various inner label members and various plastic members. 15 (a) to 15 (f) are schematic views showing a blow molding method according to a second embodiment of the present invention. 16 (a) to 16 (f) are schematic views showing a blow molding method according to a modified example of the second embodiment of the present invention. 17 (a) to 17 (g) are schematic views showing a blow molding method according to a modified example of the second embodiment of the present invention. FIG. 18 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention. FIG. 19 is a vertical cross-sectional view showing a modified example of the composite preform according to the second embodiment of the present invention. 20 (a) to 20 (f) are schematic views showing a modified example of the blow molding method according to the second embodiment of the present invention.

First Embodiment Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. 1 to 10 are diagrams showing the first embodiment of the present invention.

(Composite container 10A)
First, the outline of the composite container produced by the blow molding method according to the present embodiment will be described with reference to FIGS. 1 and 2. In addition, in this specification, "upper" and "lower" mean the upper part and the lower part in the state (FIG. 1) in which the composite container 10A is upright, respectively.

As will be described later, the composite container 10A shown in FIGS. 1 and 2 is biaxially stretched with respect to the composite preform 70 (see FIG. 3) including the preform 10a and the plastic member 40a using a blow molding die 50. It is obtained by integrally expanding the preform 10a of the composite preform 70 and the plastic member 40a by performing blow molding.

Such a composite container 10A includes a container body 10 made of a plastic material located inside and a plastic member 40 provided in close contact with the outside of the container body 10.

Of these, 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. It is provided with a bottom portion 30 provided below the portion 20.

On the other hand, the plastic member 40 is in close contact with the outer surface of the container body 10 in a thinly extended state, and is attached to the container body 10 in a state where it does not easily move or rotate.

(Container body 10)
Next, the container body 10 will be described in detail. As described above, the container body 10 has a mouth portion 11, a neck portion 13, a shoulder portion 12, a body portion 20, and a bottom portion 30.

Of these, the mouth portion 11 has a screw portion 14 screwed to a cap (not shown) and a flange portion 17 provided below the screw portion 14. 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 having a substantially uniform diameter. Further, the shoulder portion 12 is located between the neck portion 13 and the body portion 20, and has a shape in which the diameter gradually increases from the neck portion 13 side to the body portion 20 side.

Further, the body portion 20 has a cylindrical shape having a substantially uniform diameter as a whole. However, the present invention is not limited to this, and the body portion 20 may have a polygonal tubular shape such as a quadrangular tubular shape or an octagonal tubular shape. Alternatively, the body portion 20 may have a tubular shape having a non-uniform horizontal cross section from the upper side to the lower side. Further, in the present embodiment, the body portion 20 is not formed with irregularities and has a substantially flat surface, but the present invention is not limited to this. For example, the body portion 20 may have irregularities such as panels or grooves.

On the other hand, the bottom portion 30 has a recess 31 located at the center and a ground contact portion 32 provided around the recess 31. The shape of the bottom portion 30 is not particularly limited, and may have a conventionally known bottom shape (for example, a petaloid bottom shape, a round bottom shape, or the like).

The thickness of the container body 10 in the body portion 20 is not limited to this, but can be reduced to, for example, about 50 μm to 250 μm. Further, the weight of the container body 10 is not limited to this, but can be, for example, 10 g to 20 g when the volume is 500 mL. 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 manufactured by biaxially stretching blow molding a preform 10a (described later) manufactured by injection molding a synthetic resin material. As the material of the preform 10a, that is, the container body 10, a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PC (polyethylene) or ionomer resin is used. It is preferable to do so. Further, the above-mentioned various resins may be blended and used. The container body 10 may be colored in colors such as red, blue, yellow, green, brown, black, and white, but is preferably colorless and transparent in consideration of ease of recycling. Further, a thin-film film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the container body 10 in order to enhance the barrier property of the container.

Further, the container body 10 can 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 has gas barrier properties and light-shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), ethylene vinyl alcohol copolymer resin (EVOH) or PEN (polyethylene naphthalate). A preform 10a composed of three or more layers as a resin (intermediate layer) having As the intermediate layer, a resin blended with the above-mentioned various resins may be used.

Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foam preform having a foam cell diameter of 0.5 to 100 μm is formed, and this foam preform is blow molded. By doing so, the container body 10 may be manufactured. Since such a container body 10 has a foam cell built-in, it is possible to improve the light-shielding property of the entire container body 10.

Such a container body 10 may consist of, for example, a bottle having a full filling capacity of 100 mL to 2000 mL. Alternatively, the container body 10 may be a large bottle having a full filling capacity of, for example, 10 L to 60 L.

(Plastic member 40)
Next, the plastic member 40 will be described.

The plastic member 40 can be obtained by blow molding the plastic member 40a. More specifically, it is obtained by providing a plastic member 40a so as to surround the outside of the preform 10a as described later, bringing it into close contact with the outside of the preform 10a, and then biaxially stretching blow molding together with the preform 10a. be able to.

The plastic member 40 is attached to the outer surface of the container body 10 without being adhered, and 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. Further, as shown in FIG. 2, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, 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, the body portion 20, and the bottom portion 30 of the container body 10, excluding the mouth portion 11 and the neck portion 13. As a result, 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.

The plastic member 40 may be provided in the entire area or a part of the container body 10 other than the mouth portion 11. For example, the plastic member 40 may be provided so as to cover the entire neck portion 13, shoulder portion 12, body portion 20, and bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of the plastic member 40 is not limited to one, and a plurality of plastic members 40 may be provided. For example, two plastic members 40 may be provided on the outer surface of the shoulder portion 12 and the outer surface of the bottom portion 30, respectively.

In the present invention, the plastic member 40 includes a layer containing a polypropylene resin as a main constituent component. As will be described later, the plastic member 40 may be composed of the layer (single layer) or may be composed of multiple layers including the layer.

The content of polypropylene in the layer is preferably 60 parts by mass or more, and more preferably 80 parts by mass or more with respect to 100 parts by mass of the resin component contained in the layer.
By setting the content of the polypropylene resin in the layer within the above numerical range, the transparency of the layer can be enhanced.

Polypropylene resin includes random polypropylene resin, block polypropylene resin, and homopolypropylene resin, but from the viewpoint of transparency, the layer preferably contains random polypropylene resin.
In the present specification, the random polypropylene resin is obtained by randomly copolymerizing propylene and a monomer other than propylene.
Examples of the monomer other than propylene include ethylene, 1-butene, 1-pentene, 1-hexene and the like, and among these, ethylene is preferable from the viewpoint of low cost.

The layer containing the polypropylene resin may contain a resin other than the polypropylene resin (other resin) as long as its characteristics are not impaired. For example, PE, PET, PEN, EVOH, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, phthal. Dialyl acid acid resin, fluororesin, polymethyl methacrylate, polyacrylic acid, methyl polyacrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylenepropylene rubber, butyl rubber, nitrile rubber, acrylic Rubber, silicone rubber, fluororubber, nylon 6, nylon 6,6, nylon MXD6, aromatic polyamide, polycarbonate, ethylene polyterephthalate, butylene polyterephthalate, ethylene polynaphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, Polyetherketone, polyetheretherketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyethersulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin, ionomer Examples include those containing resin and the like. Further, the layer may contain a copolymer in which two or more monomer units constituting the above-mentioned resin are polymerized. Further, the layer may contain two or more of the above-mentioned resins.
Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foam member having a foam cell diameter of 0.5 to 100 μm is used, and this foam preform is molded. , The light blocking effect can be enhanced.

The layer containing the polypropylene resin can further contain a colorant. The colorant is not particularly limited, but for example, a brown, black, green, blue or red colorant can be used. The colorant may be a pigment or a dye, but is preferably a pigment from the viewpoint of light resistance.

Further, the layer containing the polypropylene resin may contain various additives as long as its properties are not impaired. Additives include, for example, plasticizers, UV stabilizers, colorants, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, thread friction reducing agents, slip agents, mold release agents, anti-oxidants. Excipients, ion exchangers, color pigments and the like can be added. Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foam member having a foam cell diameter of 0.5 to 100 μm is used, and this foam preform is molded. , The light blocking effect can be enhanced.

The layer containing the polypropylene resin may contain the same material as the material constituting the container body 10. In this case, the plastic member 40 can be arranged mainly in the portion of the composite container 10A where the strength is desired to be increased, and the strength of the portion can be selectively increased. For example, the plastic member 40 may be provided around the shoulder portion 12 and the bottom portion 30 of the container body 10 to increase the strength of this portion. Examples of such a material include thermoplastic resins, particularly PEPET, PEN, and PC.

The layer containing the polypropylene resin may contain a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, without using a multi-layer preform or a preform containing a blended material as the preform 10a, the gas barrier property of the composite container 10A is enhanced, oxygen intrusion into the container is prevented, and the content liquid is prevented from deteriorating. In addition, it is possible to prevent the evaporation of water vapor from the inside of the container to the outside and prevent the content from being reduced. For example, the plastic member 40 may be provided in the entire area of the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container main body 10 to enhance the gas barrier property of this portion. As such a material, PE, MXD-6, EVOH, or an oxygen absorber such as a fatty acid salt may be mixed with these materials.

The layer containing the polypropylene resin may contain a material having a light barrier property such as ultraviolet rays. In this case, it is possible to enhance the light barrier property of the composite container 10A and prevent the content liquid from being deteriorated by ultraviolet rays or the like without using a multilayer preform or a preform containing a blend material as the preform 10a. For example, the plastic member 40 may be provided over the entire area of the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container main body 10 to enhance the ultraviolet barrier property of this portion. As such a material, a blended material or a material obtained by adding a light-shielding resin to PET or PE can be considered. Further, a foaming member having a foam cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, may be used.

The layer containing the polypropylene resin may contain a material having higher heat retention or cold retention (material having low thermal conductivity) than the plastic material constituting the container body 10. When the plastic member 40 is composed of multiple layers, the plastic member 40 includes a layer made of a material having higher heat retention or cold retention (material having low thermal conductivity) than the plastic material constituting the container body 10. You may. 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. As a result, the heat retention or cold retention of the composite container 10A is enhanced. For example, the plastic member 40 may be provided on all or part of the body 20 of the container body 10 to improve the heat retention or cold retention of the body 20. Further, when the user grips the composite container 10A, it is prevented that the composite container 10A becomes difficult to hold due to being too hot or too cold. As such a material, foamed polyurethane, polystyrene, PE, phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. Further, a foaming member having a foam cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, may be used. It is preferable to mix hollow particles with the resin material containing these resins. The average particle size of the hollow particles is preferably 1 to 200 μm, more preferably 5 to 80 μm. The "average particle size" means the volume average particle size, and is measured by a known method using a particle size distribution / particle size distribution measuring device (for example, Nanotrack particle size distribution measuring device, manufactured by Nikkiso Co., Ltd.). can do. Further, the hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like, but are organic because of their excellent dispersibility. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include a styrene resin such as a crosslinked styrene-acrylic resin, a (meth) acrylic resin such as acrylonitrile-acrylic resin, a phenol resin, a fluorine resin, a polyamide resin, and a polyimide. Examples thereof include based resins, polycarbonate resins, and polyether resins. In addition, Low Pay HP-1055, Low Pay HP-91, Low Pay OP-84J, Low Pay Ultra, Low Pay SE, Low Pay ST (manufactured by Roam and Hearth Co., Ltd.), Nipole MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782 , SX866 (manufactured by JSR Corporation) and other commercially available hollow particles can also be used. When the plastic member 40a is composed of a single layer, the content of the hollow particles is preferably 0.01 to 50 parts by mass with respect to 100 parts by mass of the resin material contained in the plastic member 40a. More preferably, it is ~ 20 parts by mass. When the plastic member 40a is composed of multiple layers, the amount is preferably 0.01 to 50 parts by mass and 1 to 20 parts by mass with respect to 100 parts by mass of the resin material contained in the layer containing hollow particles. More preferred.

Further, the layer containing the polypropylene resin may contain a material that is less slippery than the plastic material constituting the container body 10. In this case, the user can easily grip the composite container 10A without changing the material of the container body 10. For example, the plastic member 40 may be provided on all or part of the body 20 of the container body 10 to make the body 20 easier to hold.

As described above, the plastic member 40 may be composed of a single layer or a multilayer. For example, the plastic member 40 has a three-layer structure of an outer surface layer, an intermediate layer, and an inner surface layer, and at least one of these has a polypropylene resin as a main constituent component. In addition, these layers may be those which are adhered through an adhesive layer.

In one embodiment, the plastic member 40 comprises a three-layer configuration of an outer surface layer, an intermediate layer and an inner surface layer, and the outer surface layer and the inner surface layer contain polypropylene resin as a main constituent component.
An adhesive layer may be provided between the outer layer, the intermediate layer, and the inner layer.
In this case, the intermediate layer preferably contains, as a main component, a resin having a melting point of 20 ° C. or less in absolute value of the difference from the melting point of the polypropylene resin.
When the plastic member 40a is blow-molded to form the plastic member 40, vertical streaks may occur on the surface. Such a problem can be solved by the intermediate layer containing the resin as described above.
Examples of such a resin include EVOH, PVC, PVDF (polyvinylidene fluoride), and PC.

As the main constituent component, the layer other than the layer containing the polypropylene resin may contain other resins as described above, additives and the like.

Specific configurations of the plastic member 40 include a configuration in which the outer surface layer and the inner surface layer contain polypropylene resin as a main constituent component, and the intermediate layer contains EVOH as a main constituent component (PP). / Adhesive layer / EVOH / Adhesive layer / PP)
Examples of the adhesive constituting the adhesive layer include a polyvinyl acetate adhesive, a polyacrylic acid ester adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, and a polyester adhesive. Examples thereof include polyamide-based adhesives, polyimide-based adhesives, amino-resin-based adhesives, phenol-resin-based adhesives, epoxy-based adhesives, polyurethane-based adhesives, rubber-based adhesives, and silicone-based adhesives.

The plastic member 40 may be designed or printed. In this case, it is possible to display an image or characters on the composite container 10A without separately attaching a label or the like to the container body 10 after blow molding.
For example, a plastic member 40 may be provided on all or a part of the body 20 of the container body 10, and an image or characters may be displayed on the body 20.
Printing can be performed by designing or printing on the plastic member 40a by, for example, a printing method such as an inkjet method, a gravure printing method, an offset printing method, or a flexographic printing method.
This printing may be performed on the plastic member 40a, or may be performed on the plastic member 40 after blow molding.
For example, when the inkjet method is used, a UV curable ink is applied to the plastic member 40a, UV irradiation is performed on the plastic member 40a, and the ink is cured to form a print layer. Further, this printing may be applied to the plastic member (shrink tube) 40a before being attached to the preform 10a, or may be applied with the plastic member 40a provided on the outside of the preform 10a. good.

Since the plastic member 40 is not welded or adhered to the container body 10, it can be peeled off from the container body 10 and removed. Specifically, for example, the plastic member 40 is cut with a knife or the like, crushed with a crusher, or a cutting line (not shown) is provided in advance on the plastic member 40, and the plastic member 40 is made of plastic along the cutting line. The member 40 can be peeled off. As a result, the printed plastic member 40 can be separated and removed from the container body 10, so that the colorless and transparent container body 10 can be recycled as in the conventional case.

Further, a label may be attached to the plastic member 40. Examples of this label include shrink labels, stretch labels, roll labels, tack labels, and the like. It is preferable that such a label is provided with a printed area on which printing is performed, and items displayed in the printed area include, in addition to the design and product name, the name of the content liquid, the manufacturer, and the raw material. Character information such as a first name can be mentioned. In order to make such a display clearer, it is necessary to print the label in white to form a base before printing the character information. In the present invention, the plastic member 40 is a white pigment. It is not necessary to form a base for the label again because it contains the above and serves as a base.

The thickness of the plastic member 40 is not limited to this, but can be, for example, about 5 μm to 50 μm when attached to the container body 10.

(Composite preform 70)
Next, the configuration of the composite preform 70 according to the present embodiment will be described with reference to FIG.

As shown in FIG. 3, the composite preform 70 includes a preform 10a made of a plastic material and a bottomed cylindrical plastic member 40a provided on the outside of the preform 10a.

(Preform 10a)
Of these, the preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. Of these, the mouth portion 11a corresponds to the mouth portion 11 of the container body 10 described above, and has substantially the same shape as the mouth portion 11. Further, the body portion 20a corresponds to the neck portion 13, the shoulder portion 12 and the body 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.

(Plastic member 40a)
The plastic member 40a is attached to the outer surface of the preform 10a without being adhered to the preform 10a so that it does not move or rotate, or is in close contact with the preform 10a so as not to fall under its own weight. .. The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

In this case, the plastic member 40a is provided so as to cover the entire body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

The plastic member 40a may be provided in the entire area or a part of the area other than the mouth portion 11a. For example, the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a. Further, the number of the plastic members 40a is not limited to one, and a plurality of plastic members 40a may be provided. For example, two plastic members 40a may be provided at two locations on the outer side of the body portion 20a, respectively.

Such a plastic member 40a may not have an action of contracting with respect to the preform 10a, or may have an action of contracting. After blow molding, the plastic member 40a has an action of shrinking with respect to the preform 10a from the viewpoint that the amount of air entering between the container body 10 and the plastic member 40 is small, that is, the adhesion is high. It is preferable to have something (shrink tube).

In the former case, the plastic member 40a includes, for example, a blow tube manufactured by blow molding, a sheet molding tube manufactured by sheet molding, an extrusion tube manufactured by extrusion molding, an inflation molding tube manufactured by inflation molding, and the like. However, the present invention is not limited to this, and a molding method other than the above may be used.

On the other hand, when the plastic member 40a has an action of contracting, the plastic member 40a contracts (for example, heat shrinks) with respect to the preform 10a, for example, when an external action (for example, heat) is applied. May be used. Alternatively, the plastic member 40 may itself have shrinkage or elasticity and can shrink without applying an external action.

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

As shown in FIG. 4A, the plastic member 40a has a bottomed cylindrical shape as a whole, and may have a cylindrical body portion 41 and a bottom portion 42 connected to the body 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. Examples of such a plastic member 40a include the blow tube and the sheet forming tube described above.

Further, as shown in FIG. 4B, the plastic member 40a may have a circular tube shape (bottomless cylindrical shape) as a whole, and may have a cylindrical body portion 41. In this case, as the plastic member 40a, for example, the blow tube, extrusion tube, inflation molding tube, and sheet molding tube described above can be used.

Further, as shown in FIGS. 4 (c) and 4 (d), the plastic member 40a may be manufactured by forming a film into a tubular shape and laminating its ends. In this case, as shown in FIG. 4 (c), the plastic member 40a may be formed in a pipe shape (bottomless cylindrical shape) having a body portion 41, and as shown in FIG. 4 (d). It may be formed in a bottomed cylinder shape by sticking the bottom portions 42 together. In this case, as the plastic member 40a, for example, a blow tube, an extrusion tube, an inflation molding tube, or a sheet molding tube can be used.

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

In one embodiment, the plastic member 40a can be manufactured by molding a resin sheet containing polypropylene resin or the like.
Examples of the molding method include deep drawing molding, or a method of molding a resin sheet into a tube shape and fusing or adhering its ends.
Further, the multi-layered plastic member 40a can be obtained by molding a laminated resin sheet in which two or more resin sheets are laminated via the above-mentioned adhesive.
The resin sheet may be a commercially available product, or may be produced by a conventionally known method. In the present invention, it is preferably produced by extrusion molding, and the extrusion molding is preferably carried out by a T-die method or an inflation method.

In one embodiment, the plastic member 40a can also be produced by extruding a mixture containing a heat-melted polypropylene resin or the like into a tube shape.
In this case, the multi-layered plastic member 40a can be obtained by co-extruding a mixture of two or more kinds. Further, the plastic member 40a can also be obtained by extruding the mixture in a mold and then blow molding the mixture in the mold so as to expand the diameter along the inner surface of the mold (direct). Blow molding).

Further, the shrinkable plastic member 40a can be obtained as follows.
First, one end of the tube obtained by extruding the mixture is closed by adhesion, welding or the like. A tube with one end closed is placed in a tubular mold having an inner diameter larger than the outer diameter of the tube, and a blow device is placed at the other end of the tube. At this time, it is preferable that the blow device is in close contact with the tube so that air does not leak between them.
The tube, mold and blower are then fed into the heating furnace in this arrangement and heated to 70-150 ° C. inside the heating furnace. As the heating furnace, a hot air circulation type heating furnace may be used in order to keep the inside thereof at a uniform temperature. Alternatively, the tubes, molds and blowers may be heated by passing them through the heated liquid. Next, the tube, the mold and the blow device are taken out from the heating furnace, and air is blown into the tube from the blow device to pressurize and stretch the inner surface of the tube. As a result, the tube expands and the diameter is expanded along the inner surface shape of the mold. Then, the tube is cooled in cold water while the air is blown from the blow device, and the tube is taken out from the mold. By cutting this into a desired size, a shrinkable plastic member 40a can be obtained.

Further, in one embodiment, the plastic member 40a can also be obtained by an injection molding method. Specifically, first, a mixture containing a polypropylene resin or the like is heated and melted. Then, the heated and melted mixture is injected into the mold. The plastic member 40a can also be obtained by cooling this and taking it out of the mold.

Manufacturing Method of Composite Container 10A Next, a manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 5 (a) to 5 (f).

First, a preform 10a made of a plastic material is prepared (see FIG. 5A). In this case, the preform 10a may be produced by an injection molding method using, for example, an injection molding machine (not shown). Further, as the preform 10a, a preform generally used in the past may be used.

Next, by providing the plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is produced (FIG. 5 (FIG. 5). b) See). In this case, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member 40a is attached so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

In this case, 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, as will be described later, a heat-shrinkable plastic member 40a is provided on the outer surface of the preform 10a, and the plastic member 40a is heat-shrinked by heating to 50 ° C. to 100 ° C. to shrink the outer surface of the preform 10a. It may be in close contact with.

In this way, a series of steps for producing the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a in advance to prepare the composite preform 70 (FIGS. 5A to 5B). )) And a series of steps (FIGS. 5 (c) to (f)) for producing the composite container 10A by blow molding can be carried out at different places (factory or the like).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 5C). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90 ° C to 130 ° C.

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 5D).

The composite container 10A is molded using the blow molding die 50. In this case, the blow molding die 50 includes a pair of body molds 50a and 50b that are separated from each other and a bottom mold 50c (see FIG. 5D). In FIG. 5D, the pair of body molds 50a and 50b are open to 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. 5 (e), after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the pair of body molds 50a and 50b and the bottom mold 50c are sealed. The blow-molded mold 50 is constructed. Next, air is press-fitted into the preform 10a, and biaxial stretch blow molding is performed on the composite preform 70.

As a result, the container body 10 can be obtained from the preform 10a in the blow molding die 50. During this time, the body molds 50a and 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 integrally expanded. As a result, the preform 10a and the plastic member 40a are integrally shaped into a shape corresponding to the inner surface of the blow molding die 50.

In this way, the composite container 10A including 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. 5 (f), the pair of body molds 50a and 50b and the bottom mold 50c are separated from each other, and the composite container 10A is taken out from the blow molding mold 50.

Modification Example of Manufacturing Method of Composite Container 10A Next, a modification of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 6A to 6F. The modified examples shown in FIGS. 6 (a) to 6 (f) are those in which the plastic member 40a has an action of contracting with respect to the preform 10a (shrink tube), and other configurations are shown in FIGS. 5 (a) to 5 (a). It is substantially the same as the form shown in (f). In FIGS. 6A to 6F, the same parts as those in FIGS. 5A to 5F are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 6A).

Next, a plastic member 40a is provided on the outside of the preform 10a (see FIG. 6B). In this case, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member 40 is mounted so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

Next, the preform 10a and the plastic member 40a are heated by the heating device 51 (see FIG. 6C). At this time, the preform 10a and the plastic member 40a are uniformly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90 ° C to 130 ° C.

When the plastic member 40a is heated in this way, the plastic member 40a is thermally shrunk and comes into close contact with the outside of the preform 10a (see FIG. 6C). When the plastic member 40a itself has shrinkage, the plastic member 40a comes into close contact with the outside of the preform 10a when the plastic member 40a is provided on the outside of the preform 10a (see FIG. 6B). You may be.

Subsequently, the preform 10a and the plastic member 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 6D).

The preform 10a and the plastic member 40a are molded using the blow molding die 50, and the container body 10 and the container body 10 are formed in substantially the same manner as in the cases of FIGS. 5A to 5F described above. A composite container 10A provided with a plastic member 40 provided on the outer surface can be obtained (see FIGS. 6 (d) to 6 (f)).

Other Modifications of the Method for Manufacturing the Composite Container 10A Next, another modification of the method for manufacturing the composite container 10A (blow molding method) according to the present embodiment will be described with reference to FIGS. 7 (a) to 7 (g). In the modified examples shown in FIGS. 7 (a) to 7 (g), the plastic member 40a has an action of contracting with respect to the preform 10a (shrink tube), and the preform 10a and the plastic member 40a are heated in two steps. The other configurations are substantially the same as those shown in FIGS. 5 (a) to 5 (f). In FIGS. 7 (a) to 7 (g), the same parts as those in FIGS. 5 (a) to 5 (f) are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 7A).

Next, a plastic member 40a is provided on the outside of the preform 10a (see FIG. 7B). In this case, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member 40 is mounted so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

Next, the preform 10a and the plastic member 40a are heated by the first heating device 55 (see FIG. 7C). At this time, the heating temperature of the preform 10a and the plastic member 40a may be, for example, 50 ° C. to 100 ° C.

When the plastic member 40a is heated, the plastic member 40a heat-shrinks and comes into close contact with the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a can be obtained (see FIG. 7C).

In this way, a series of production of the composite preform 70 by heat-adhering the plastic member 40a to the outside of the preform 10a in advance using the first heating device 55 to prepare the composite preform 70. The steps (FIGS. 7 (a) to (c)) and the series of steps (FIGS. 7 (d) to (g)) for producing the composite container 10A by blow molding are carried out at different places (factories, etc.). Becomes possible.

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

Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 7E).

The composite preform 70 is molded using the blow molding die 50, and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the cases of FIGS. 5 (a) to 5 (f) described above. A composite container 10A provided with a shrinkable tube 40 is obtained (see FIGS. 7 (e) to 7 (g)).

As described above, according to the present embodiment, the preform 10a of the composite preform 70 and the plastic member 40a are integrally formed by performing blow molding on the composite preform 70 in the blow molding mold 50. To prepare a composite container 10A having a container body 10 and a plastic member 40. As a result, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be made of separate members. Therefore, various functions and characteristics can be freely imparted to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

Further, according to the present embodiment, when the composite container 10A is manufactured, a general blow molding apparatus can be used as it is, so that it becomes necessary to prepare a new molding facility for manufacturing the composite container 10A. No.

Modifications of the First Embodiment Next, a modification of the composite container 10A of the present invention will be described with reference to FIGS. 8, 9 and 10 (a) to 10 (f).

The modified examples shown in FIGS. 8, 9 and 10 (a) to 10 (f) do not have a body and a bottom as the plastic member 40a, but use a cylindrical plastic member 40a. ..

In the composite container 10A shown in FIG. 8, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20, but does not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 9, the plastic member 40a is in close contact so as to cover only the body portion 20a of the preform 10a, and more specifically, the neck portion 13 of the container body 10 of the body portion 20a. It covers the area excluding the portion 13a corresponding to the portion 13a and the portion corresponding to the lower portion of the body portion 20a.

The other configurations in FIGS. 8, 9 and 10 (a) to 10 (f) are substantially the same as the embodiments shown in FIGS. 1 to 5. In the modified examples shown in FIGS. 8, 9 and 10 (a) to 10 (f), the same parts as those of the embodiments shown in FIGS. 1 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiments shown in FIGS. 1 to 5, so detailed description thereof will be omitted. Further, in FIGS. 8, 9 and 10 (a) to 10 (f), the plastic member 40 having an action of contracting with respect to the preform 10a may be used.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 11 to 20 are views showing a second embodiment of the present invention. In FIGS. 11 to 20, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

First, the outline of the composite container produced by the blow molding method according to the present embodiment will be described with reference to FIGS. 11 and 12.

(Composite container 10A)
As will be described later, the composite container 10A shown in FIGS. 11 and 12 is formed into a composite preform 70 (see FIG. 13) including a preform 10a, an inner label member 60a, and a plastic member 40a by using a blow molding die 50. On the other hand, it is obtained by integrally expanding the preform 10a, the inner label member 60a, and the plastic member 40a of the composite preform 70 by performing biaxial stretch blow molding.

Such a composite container 10A is provided in close contact with the container body 10 made of a plastic material located inside, the inner label member 60 provided in close contact with the outside of the container body 10, and the outer side of the inner label member 60. The plastic member 40 is provided.

Of these, 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. It is provided with a bottom portion 30 provided below the portion 20.

On the other hand, the inner label member 60 is in close contact with the outer surface of the container body 10 in a thinly extended state, and is in close contact with the container body 10 so as not to easily move or rotate.

Further, the plastic member 40 is in close contact with the outer surface of the container body 10 and the outer surface of the inner label member 60 in a thinly extended state, and is in close contact with the container body 10 so as not to easily move or rotate. There is. Further, the plastic member 40 includes a resin material and a white pigment.

It is considered that at least a part of the plastic member 40 is translucent or transparent, and in this case, the inner label member 60 can be visually recognized from the outside through the translucent or transparent portion.

(Inner label member 60)
Next, the inner label member 60 will be described. The inner label member 60 (60a) is provided so as to surround the outside of the preform 10a as described later, and is obtained by biaxially stretching blow molding integrally with the preform 10a and the plastic member 40a. It is a thing.

The inner label member 60 is attached to the outer surface of the container body 10 without being adhered, and is in close contact with the container body 10 so as not to move or rotate. The inner label member 60 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. As shown in FIG. 12, the inner label member 60 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

In this case, the inner label member 60 is provided so as to cover the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, excluding the mouth portion 11 and the neck portion 13. As a result, desired characters, images, and the like can be added to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, and the composite container 10A can be decorated and information can be displayed.

The inner label member 60 may be provided in the entire area or a part of the container body 10 other than the mouth portion 11. For example, the inner label member 60 may be provided so as to cover the entire neck portion 13, shoulder portion 12, body portion 20, and bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of inner label members 60 is not limited to one, and a plurality of inner label members 60 may be provided. The inner label member 60 may be provided in the same area as the plastic member 40, or may be provided in a narrower area than the plastic member 40. In the latter case, the inner label member 60 is preferably completely covered by the plastic member 40.

The thickness of the inner label member 60 is not limited to this, but can be, for example, about 5 μm to 50 μm when attached to the container body 10.

(Plastic member 40)
Next, the plastic member 40 will be described. The plastic member 40 is obtained by providing a plastic member 40a so as to surround the outer side of the inner label member 60a, and integrally stretching the preform 10a, the inner label member 60a, and the plastic member 40a by biaxial stretching blow molding. It was made.

The plastic member 40 is attached to the outer surface of the inner label member 60 without being adhered, and 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 inner label member 60 to cover the inner label member 60. As shown in FIG. 12, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

In addition, since the configurations of the container body 10 and the plastic member 40 are substantially the same as those of the first embodiment described above, detailed description thereof will be omitted here.

(Composite preform 70)
Next, the configuration of the composite preform 70 according to the present embodiment will be described with reference to FIG.

As shown in FIG. 13, the composite preform 70 includes a preform 10a made of a plastic material, a bottomed cylindrical inner label member 60a provided in close contact with the outer side of the preform 10a, and an inner label member 60a. It is provided with a bottomed cylindrical plastic member 40a provided in close contact with the outside.

(Inner label member 60a)
The inner label member 60a is in close contact with the outer surface of the preform 10a, and is in close contact with the preform 10a in a state where it does not easily move or rotate. The inner label member 60a is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

The inner label member 60a may be pre-designed or printed. For example, in addition to the design, product name, and the like, character information such as the name of the content liquid, the manufacturer, and the name of the raw material may be described. In this case, it is possible to display an image or characters on the composite container 10A without separately attaching a label or the like to the container body 10 after blow molding. For example, the inner label member 60a may be provided on all or part of the body portion 20a of the preform 10a so that an image or characters can be displayed on the body portion 20 of the container body 10 after molding. This eliminates the need for a step of attaching a label using a labeler after sealing the container, so that the manufacturing cost can be suppressed and the yield can be prevented from being lowered.

As such an inner label member 60a, a film such as a polyester resin, a polyamide resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, a fluorine resin, or an ionomer resin can be used. The inner label member 60a may be made of the same material as the container body 10 (preform 10a) and / or the plastic member 40a, or may be made of a different material.

Further, as the inner label member 60a, various materials described below can also be used.

For example, the inner label member 60a may be made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, it is possible to enhance the gas barrier property of the composite container 10A and prevent the content liquid from being deteriorated by oxygen or water vapor without using a multilayer preform or a preform containing a blend material as the preform 10a. As such a material, PE, PP, MXD-6, EVOH or an oxygen absorber such as a fatty acid salt may be mixed with these materials.

Further, the inner label member 60a may be made of a material having a light barrier property such as ultraviolet rays. In this case, without using a multi-layer preform or a preform containing a blended material as the preform 10a, the light barrier property of the composite container 10A is enhanced, oxygen is prevented from entering the container, and the content liquid is deteriorated. It is possible to prevent the evaporation of water vapor from the inside of the container to the outside and prevent the content from being reduced. As such a material, a blended material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered.

Further, the inner label member 60a may be made of a material (material having low thermal conductivity) having higher heat retention or cold retention than the plastic material constituting 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. As a result, the heat retention or cold retention of the composite container 10A is enhanced. As such a material, foamed polyurethane, polystyrene, PE, PP, phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. Further, it preferably contains hollow particles. The average particle size of the hollow particles is preferably 1 to 200 μm, more preferably 5 to 80 μm. Further, the hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like, but are organic because of their excellent dispersibility. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include the same resins as those described above. Moreover, the above-mentioned commercially available hollow particles can also be used. The content of the hollow particles is preferably 0.01 to 50 parts by mass, and more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the resin contained in the inner label member 60a.

(Plastic member 40a)
On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without being adhered to the preform 10a so as not to move or rotate. The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

In this case, the inner label member 60a and the plastic member 40a are provided so as to cover the entire body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

The inner label member 60a and the plastic member 40a may be provided in the entire area or a part of the area other than the mouth portion 11a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a. Further, the inner label member 60a and the plastic member 40a are not limited to one each, and a plurality of inner label members 60a may be provided. For example, two inner label members 60a and a plastic member 40a may be provided at two locations on the outer side of the body portion 20a, respectively.

The plastic member 40a may be one that does not have a contracting action on the preform 10a, or may have a contracting action (shrinking tube).

In the latter case, the plastic member 40a may have an action of contracting with respect to the preform 10a. As the plastic member 40a, it is preferable to use a member that shrinks (for example, heat shrinks) with respect to the preform 10a when an external action (for example, heat) is applied.

In addition, since the configurations of the preform 10a and the plastic member 40a are substantially the same as those of the first embodiment described above, detailed description thereof will be omitted here.

Next, the shapes of the plastic member 40a and / or the inner label member 60a will be described.

As shown in FIGS. 13 and 14 (a), the plastic member 40a (inner label member 60a) has a bottomed cylindrical shape as a whole, and has a cylindrical body 41 (body 61) and a body 41. It may have a bottom portion 42 (bottom portion 62) connected to (body portion 61). In this case, since the bottom 42 (bottom 62) of the plastic member 40a (inner label member 60a) covers the bottom 30a of the preform 10a, various functions are also provided for the bottom 30 in addition to the body 20 of the composite container 10A. And characteristics can be given.

Further, as shown in FIG. 14B, the plastic member 40a (inner label member 60a) has a circular tube shape (bottomless cylindrical shape) as a whole, and has a cylindrical body portion 41 (body portion 61). You may have. In this case, as the plastic member 40a (inner label member 60a), for example, an extrusion tube can be used.

Further, as shown in FIGS. 14 (c) and 14 (d), the plastic member 40a (inner label member 60a) may be manufactured by forming a film into a tubular shape and laminating its ends. good. In this case, as shown in FIG. 14 (c), the plastic member 40a may be formed in a pipe shape (bottomless cylindrical shape) having a body portion 41 (body portion 61), and is formed in FIG. 14 (d). As shown in the above, the bottom portion 42 (bottom portion 62) may be bonded to form a bottomed cylinder shape.

Manufacturing Method of Composite Container 10A Next, a manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 15 (a) to 15 (f).

First, a preform 10a made of a plastic material is prepared (see FIG. 15A).

Next, the inner label member 60a is provided on the outer side of the preform 10a, and the plastic member 40a is provided on the outer side of the inner label member 60a. As a result, a composite preform 70 having the preform 10a, the inner label member 60a adhered to the outer side of the preform 10a, and the plastic member 40a adhered to the outer side of the inner label member 60a is produced (FIG. 15). See (b)). In this case, the inner label member 60a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 61 and a bottom portion 62 connected to the body portion 61.

At this time, even if the inner label member 60a and the plastic member 40a having the same or slightly smaller inner diameter as the outer diameter of the preform 10a are pushed against the preform 10a, they are brought into close contact with the outer surface of the preform 10a. good. Alternatively, a heat-shrinkable inner label member 60a and a plastic member 40a are provided on the outer surface of the preform 10a, and the inner label member 60a and the plastic member 40a are heat-shrinked by heating to 50 ° C. to 100 ° C. It may be brought into close contact with the outer surface of the preform 10a.

Further, a plastic member 40a may be provided in advance around the inner label member 60a, and the inner label member 60a and the plastic member 40a may be integrally mounted on the outside of the preform 10a. Alternatively, the inner label member 60a may be provided on the outer side of the preform 10a, and then the plastic member 40a may be provided on the outer side of the inner label member 60a.

In this way, a series of steps for producing the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a and the inner label member 60a in advance to prepare the composite preform 70 (FIG. 15 (FIG. 15). It becomes possible to carry out a series of steps (FIGS. 15 (d) to (f)) for producing the composite container 10A by blow molding at different places (factory or the like).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 15C).

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50. The composite container 10A is molded using the blow molding die 50, and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the case of the first embodiment described above. A composite container 10A including the 60 and a plastic member 40 provided on the outside of the inner label member 60 is obtained (see FIGS. 15 (d)-(f)).

In addition, the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment is substantially the same as that of the first embodiment described above, and thus detailed description thereof will be omitted here.

Modification Example of Manufacturing Method of Composite Container 10A Next, a modification of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 16A to 16F. The modified examples shown in FIGS. 16 (a) to 16 (f) are those in which the plastic member 40a has an action of contracting with respect to the preform 10a (shrink tube), and other configurations are shown in FIGS. 15 (a) to 15 (a). It is substantially the same as the form shown in (f). In FIGS. 16A to 16F, the same parts as those in FIGS. 15A to 15F are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 16A).

Next, the inner label member 60 is provided on the outer side of the preform 10a, and the plastic member 40a is provided on the outer side of the inner label member 60 (see FIG. 16B). The inner label member 60 and the plastic member 40a are mounted so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a. At least a part of the plastic member 40a may be translucent or transparent.

In this case, a plastic member 40a may be provided around the inner label member 60 in advance, and the inner label member 60 and the plastic member 40a may be integrally mounted on the outside of the preform 10a. Alternatively, the inner label member 60 may be provided on the outer side of the preform 10a, and then the plastic member 40a may be provided on the outer side of the inner label member 60.

Next, the preform 10a, the inner label member 60, and the plastic member 40a are heated by the heating device 51 (see FIG. 16C). At this time, the preform 10a, the inner label member 60, and the plastic member 40a are uniformly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a, the inner label member 60, and the plastic member 40a in this heating step may be, for example, 90 ° C to 130 ° C.

When the plastic member 40a is heated in this way, the plastic member 40a is thermally shrunk and comes into close contact with the outside of the preform 10a (see FIG. 16C). When the plastic member 40a itself has shrinkage, the plastic member 40a is outside the inner label member 60 when the plastic member 40a is provided on the outside of the inner label member 60 (see FIG. 16B). It may be in close contact.

Subsequently, the preform 10a, the inner label member 60, and the plastic member 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 16D).

The preform 10a, the inner label member 60, and the plastic member 40a are molded using the blow molding mold 50, and together with the container body 10 in substantially the same manner as in the cases of FIGS. 15A to 15F described above. , A composite container 10A including an inner label member 60 provided on the outer surface of the container body 10 and a plastic member 40 provided on the outer side of the inner label member 60 can be obtained (FIGS. 16 (d) to 16 (f)). reference).

Other Modifications of the Method for Manufacturing the Composite Container 10A Next, another modification of the method for manufacturing the composite container 10A (blow molding method) according to the present embodiment will be described with reference to FIGS. 17 (a) to 17 (g). In the modified examples shown in FIGS. 17 (a) to 17 (g), the plastic member 40a has an action of contracting with respect to the preform 10a (shrink tube), and the preform 10a and the plastic member 40a are heated in two steps. The other configurations are substantially the same as those shown in FIGS. 15 (a) to 15 (f). In FIGS. 17 (a) to 17 (g), the same parts as those in FIGS. 15 (a) to 15 (f) are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 17A).

Next, the inner label member 60 is provided on the outer side of the preform 10a, and the plastic member 40a is provided on the outer side of the inner label member 60 (see FIG. 17B). The plastic member 40a is attached so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a. At least a part of the plastic member 40a may be translucent or transparent.

In this case, a plastic member 40a may be provided around the inner label member 60 in advance, and the inner label member 60 and the plastic member 40a may be integrally mounted on the outside of the preform 10a. Alternatively, the inner label member 60 may be provided on the outer side of the preform 10a, and then the plastic member 40a may be provided on the outer side of the inner label member 60.

Next, the preform 10a, the inner label member 60, and the plastic member 40a are heated by the first heating device 55 (see FIG. 17C). At this time, the heating temperature of the preform 10a, the inner label member 60, and the plastic member 40a may be, for example, 50 ° C to 100 ° C.

When the plastic member 40a is heated, the plastic member 40a heat-shrinks and comes into close contact with the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a, the inner label member 60 adhered to the outer side of the preform 10a, and the plastic member 40a adhered to the outer side of the inner label member 60 can be obtained (FIG. 17). (C).

In this way, the composite preform 70 is produced by heat-adhering the plastic member 40a to the outside of the preform 10a and the inner label member 60 in advance using the first heating device 55 to prepare the composite preform 70. A series of steps (FIGS. 17 (a) to (c)) for producing the composite container 10A and a series of steps (FIGS. 17 (d) to (g)) for producing the composite container 10A by blow molding are performed at different locations (factory, etc.). ) Will be possible.

Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 17 (d)). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a, the inner label member 60, and the plastic member 40a in this heating step may be, for example, 90 ° C to 130 ° C.

Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 17E).

The composite preform 70 is molded using the blow molding die 50, and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the cases of FIGS. 15 (a) to 15 (f) described above. A composite container 10A including the inner label member 60 and the plastic member 40a provided on the outer side of the inner label member 60 can be obtained (see FIGS. 17 (e) to 17 (g)).

As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding mold 50, the preform 10a of the composite preform 70, the inner label member 60a, and the plastic The manufacturing member 40a is integrally expanded to manufacture a composite container 10A including the container body 10, the inner label member 60, and the plastic member 40. Therefore, the inner label member 60 can be provided in advance on the composite container 10A at the stage of manufacturing the composite container 10A using the preform 10a. Therefore, it is not necessary to provide a step of filling the composite container 10A with the content liquid, sealing the container, and then labeling with a labeler. As a result, the manufacturing cost for manufacturing the final product can be suppressed.
In addition, it is possible to prevent the yield from being lowered when the final product is manufactured due to a defect of the labeler or the like.

Further, according to the present embodiment, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be composed of separate members. Therefore, various functions and characteristics can be freely imparted to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

Further, according to the present embodiment, when the composite container 10A is manufactured, a general blow molding apparatus can be used as it is, so that it becomes necessary to prepare a new molding facility for manufacturing the composite container 10A. No.

Modifications of the Second Embodiment Next, modifications of the present invention will be described with reference to FIGS. 18, 19 and 20 (a) to 20 (f).

The modified examples shown in FIGS. 18, 19 and 20 (a) to 20 (f) do not have a body and a bottom as the inner label member 60a and the plastic member 40a, but have a cylindrical inner label member 60a and a cylindrical inner label member 60a. The plastic member 40a is used.

In the composite container 10A shown in FIG. 18, the inner label member 60 and the plastic member 40 extend from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20, but do not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 19, the inner label member 60a and the plastic member 40a are in close contact with each other so as to cover only the body portion 20a of the preform 10a. It covers an area excluding a portion 13a corresponding to the neck portion 13 of the main body 10 and a portion corresponding to the lower portion of the body portion 20a.

The other configurations in FIGS. 18, 19 and 20 (a) to 20 (f) are substantially the same as the embodiments shown in FIGS. 11 to 15. In the modified examples shown in FIGS. 18, 19 and 20 (a) to 20 (f), the same parts as those of the embodiments shown in FIGS. 11 to 15 are designated by the same reference numerals, and detailed description thereof will be omitted.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiments shown in FIGS. 11 to 15, so detailed description thereof will be omitted. Further, in FIGS. 18, 19 and 20 (a) to 20 (f), the plastic member 40 having an action of contracting with respect to the preform 10a may be used.

<Example 1>
(Preparation of preform 10a)
Using an injection molding machine, a PET preform 10a shown in FIG. 3 was produced. The weight of this preform 10a was 23.8 g.

(Manufacturing of plastic member 40a)
The plastic member 40a shown in FIG. 3 , which has a shape suitable for the preform 10a produced as described above and has a layer structure of PP / adhesive layer / EVOH / adhesive layer / PP, was produced by direct blow molding.

(Preparation of composite preform 70)
A plastic member 40a was fitted into the preform 10a and integrated to prepare a composite preform 70.

(Preparation of composite container 10A)
The composite preform 70 prepared as described above was used in a biaxial stretching blow molding machine to prepare a composite container 10A having a capacity of 300 mL and a weight of 25 g.

<Comparative example 1>
In the plastic member 40a of Example 1, a composite container 10A was produced in the same manner as in Example 1 except that the polypropylene resin was changed to polyethylene resin (having a layer structure of PE / adhesive layer / EVOH / adhesive layer / PE). Plastic member 40a).

<< Transparency test >>
A 30 mm × 30 mm section was cut out from the side wall of the composite container 10A, and the transparency of the composite container was measured using a haze meter (manufactured by Murakami Color Technology Laboratory, trade name: HM-150). The measurement results are shown in Table 1. As can be seen from the results in Table 1, the haze of the section of Example 1 is much lower and more transparent than that of Comparative Example 1.

Claims (2)

In a composite container
The container body made of plastic material and
A plastic member provided on the outer surface of the container body is provided.
The plastic member comprises an inner layer, an intermediate layer and an outer layer.
The inner surface layer and the outer surface layer contain polypropylene resin as a main constituent component.
The intermediate layer contains, as a main component, a resin having a melting point of 20 ° C. or less in absolute value of the difference from the melting point of the polypropylene resin.
Wherein the polypropylene resin is Ri random polypropylene resin der,
The plastic member is not welded or adhered to the container body.
A composite container characterized in that a cutting line is provided on the plastic member, and the plastic member can be peeled off from the container body and removed along the cutting line. The composite container according to claim 1, wherein the intermediate layer contains an ethylene-vinyl alcohol copolymer resin as a main component.

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