JP2020073306A - Composite container, production method thereof, composite preform, and plastic member - Google Patents

Abstract

To provide a composite container, a production method thereof, capable of applying various functions and properties to a container, and having high adhesion between a container body and a plastic member, and provide a composite perform, and a plastic member.SOLUTION: First, a preform 10a made of a plastic material is prepared, then, providing a plastic member 40a so as to surround an outside of the preform 10a. Then a composite preform 70 is heated and inserted into a blow molding mold 50, then blow molding is performed to the composite preform 70 in the blow molding mold 50, thereby the preform 10a and the plastic member 40a of the composite preform 70 are integrated and expanded to obtain a composite container 10A. The plastic member 40a is a shrinkable tube formed of multi layers.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a composite container and a method for manufacturing the same, a composite preform, and a plastic member.

  In recent years, plastic bottles have become common as a bottle for storing a liquid content such as food and drink, and the liquid content is stored in such a plastic bottle.

  A plastic bottle containing such a content liquid is manufactured by inserting a preform into a mold and performing biaxial stretch blow molding.

  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, a blend material or the like is used to form a container shape. However, in the conventional biaxial stretch blow molding method, generally, the preform is simply molded into a container shape. Therefore, when the container has various functions and characteristics (barrier property, heat retaining property, etc.), its means is limited, for example, by changing the material forming the preform. In particular, it is difficult to have different functions and characteristics depending on the part of the container (for example, the body or the bottom).

JP, 2009-241526, A

The present invention has been made in consideration of such points, and it is possible to provide various functions and characteristics to a container, a composite container and a manufacturing method thereof, a composite preform, and a plastic member. The purpose is to provide.

The present invention is a method for manufacturing a composite container,
A step of preparing a preform made of a plastic material,
Providing a plastic member on the outside of the preform,
Heating the preform and the plastic member and inserting them into a blow molding die;
By subjecting the preform and the plastic member to blow molding in the blow molding die, inflating the preform and the plastic member as a unit,
The method for producing a composite container is characterized in that the plastic member is a multi-layer shrink tube.

  The present invention is the method for manufacturing a composite container, wherein the plastic member comprises a gas barrier layer.

  The present invention is the method for producing a composite container, wherein the plastic member comprises a light barrier layer.

  The present invention is the method for manufacturing a composite container, wherein the plastic member comprises a low thermal conductivity layer.

The present invention is a composite preform,
A preform made of plastic material,
A plastic member provided so as to surround the outside of the preform,
The plastic member is adhered to the outside of the preform,
In the composite preform, the plastic member is a multi-layer shrink tube.

  The present invention is the composite preform, wherein the plastic member comprises a gas barrier layer.

  The present invention is the composite preform, wherein the plastic member is provided with a light barrier layer.

  The present invention is the composite preform, wherein the plastic member includes a low thermal conductivity layer.

The present invention is a composite container,
A container body made of plastic material,
A plastic member provided in close contact with the outside of the container body,
The container body and the plastic member are integrally expanded by blow molding,
The composite container is characterized in that the plastic member is a shrinkable tube having multiple layers.

  The present invention is the composite container, wherein the plastic member comprises a gas barrier layer.

  The present invention is the composite container, wherein the plastic member comprises a light barrier layer.

  The present invention is the composite container, wherein the plastic member comprises a low thermal conductivity layer.

The present invention provides a composite container which is mounted so as to surround the outside of a preform and is heated integrally with the preform, thereby having the preform and a plastic member adhered to the outside of the preform. A plastic member for making,
At least having a tubular body that covers the body of the preform,
It is a plastic member characterized by being a shrink tube made of multiple layers.

  The present invention is a plastic member having a gas barrier layer.

  The present invention is a plastic member comprising a light ray barrier layer.

  The present invention is a plastic member having a low thermal conductivity layer.

  According to the present invention, the preform of the composite preform and the plastic member are integrally expanded by performing blow molding on the composite preform in the blow molding die. For this reason, the preform (container body) and the plastic member can be composed of different members, and various functions and characteristics can be given to the composite container by appropriately selecting the type and shape of the plastic member. it can. Further, since the plastic member is a shrinkable tube, after blow molding, less air enters between the container body and the plastic member, and the adhesion between them can be improved. Further, since the plastic member is composed of multiple layers, various functions and characteristics can be imparted to the composite container by changing the material forming each layer.

FIG. 1 is a partial vertical sectional view showing a composite container according to a first embodiment of the present invention. FIG. 2 is a horizontal cross-sectional view (cross-sectional view taken along the line II-II of FIG. 1) showing the composite container according to the first embodiment of the present invention. FIG. 3 is a vertical sectional view showing a composite preform according to the first embodiment of the present invention. FIG. 4 is a perspective view showing a plastic member. FIG. 5 is a schematic view showing an embodiment of a method for manufacturing a shrinkable tube composed of multiple layers. 6A to 6F are schematic views showing the blow molding method according to the first embodiment of the present invention. 7A to 7F are schematic views showing a blow molding method according to a modification of the first embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a composite container according to the second embodiment of the present invention. FIG. 9 is a horizontal cross-sectional view (cross-sectional view taken along line IX-IX in FIG. 7) showing the composite container according to the second embodiment of the present invention. FIG. 10 is a vertical cross-sectional view showing a composite preform according to the second embodiment of the present invention. FIG. 11 is a perspective view showing the inner label member and the plastic member. 12A to 12F are schematic views showing a blow molding method according to the second embodiment of the present invention. 13A to 13G are schematic views showing a blow molding method according to a modified example of the second embodiment of the present invention.

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

  First, an outline of a composite container manufactured by the blow molding method according to the present embodiment will be described with reference to FIGS. 1 and 2. In the present specification, "upper" and "lower" mean the upper side and the lower side, respectively, in a state where the composite container 10A is upright (Fig. 1).

  As will be described later, the composite container 10A shown in FIGS. 1 and 2 includes a composite preform 70 including a preform 10a using a blow molding die 50 and a plastic member 40a which is a shrink tube made of multiple layers (see FIG. 3). ) Is subjected to biaxial stretch blow molding to expand the preform 10a of the composite preform 70 and the plastic member 40a as one body.

  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, and a body portion 20 provided below the shoulder portion 12, And a bottom portion 30 provided below the body portion 20.

  On the other hand, the plastic member 40 is closely attached to 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, or does not fall by its own weight. It is closely attached to the degree.

  Next, the container body 10 will be described in detail. The container body 10 includes 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 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. 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 toward 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 horizontal cross section that is not uniform from the upper side to the lower side. Further, in the present embodiment, the body portion 20 has no unevenness and has a substantially flat surface, but the present invention is not limited to this. For example, the body portion 20 may be formed with unevenness such as a panel or a groove.

  On the other hand, the bottom portion 30 has a concave portion 31 located at the center and a ground portion 32 provided around the concave portion 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 or a round bottom shape).

  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 may be 10 g to 20 g. By reducing the thickness of the container body 10 in this manner, the weight of the container body 10 can be reduced.

  Such a container body 10 can be manufactured by subjecting a preform 10a (described later) manufactured by injection molding of a synthetic resin material to biaxial stretch blow molding. 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), or PC (polycarbonate) may be used. preferable. Moreover, you may blend and use the above-mentioned various resins. The container body 10 may be colored in colors such as red, blue, yellow, green, brown, black, and white, but it is preferably colorless and transparent in consideration of ease of recycling. Further, a vapor deposition 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 improve the barrier property of the container.

  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 provided with a gas barrier property and a light shielding property such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). The preform 10a having three or more layers as the resin (intermediate layer) may be extrusion-molded and then blow-molded to form a multi-layer bottle having a gas barrier property and a light-shielding property. A resin obtained by blending the above-mentioned various resins may be used as the intermediate layer.

  Further, 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 molded, and this foamed preform is blow molded. By doing so, the container body 10 may be manufactured. Since such a container body 10 has foam cells built therein, it is possible to enhance the light-shielding property of the entire container body 10.

  The full-filled volume of the container body 10 is not particularly limited, but may be, for example, a bottle of 100 ml to 2000 ml. Alternatively, the container body 10 may be a large bottle having a full volume of 10 L to 60 L, 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 preform 10a as described later, and is adhered to the outside of the preform 10a, and then obtained by being biaxially stretch blow-molded together with the preform 10a. Be done. The plastic member 40a has a function of contracting the preform 10a (contraction tube). It is preferable that the plastic member 40a is a shrinkable tube because it does not shift with respect to the preform 10a.
Further, it is preferable because it has high followability to blow molding.

  The plastic member (shrinkable tube) 40a is a multilayered shrinkable tube, is provided outside the preform 10a, is heated integrally with the preform 10a, and is biaxially stretch blow-molded to be made of plastic. The member 40 is obtained. The plastic member (shrinkable tube) 40a may itself be shrinkable or elastic, and can be shrunk without applying an external action, and an external action (for example, heat) may occur. The preform 10a may be shrunk (for example, heat shrunk) when applied, but from the viewpoint of high followability, when an external action (for example, heat) is applied, A material that contracts (for example, heat contracts) with respect to the reform 10a is preferable.

  The plastic member 40 is attached to the outer surface of the container body 10 without being adhered thereto, and is in close contact with the container body 10 so as not to move or rotate, or in such a degree that it does not drop by its own weight. 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 area in the circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section. Since the plastic member 40a is a contraction tube having a function of contracting with respect to the preform 10a, after blow molding, little air enters between the container body and the plastic member 40, and the adhesion between them is low. high.

  In this case, the plastic member 40 is provided so as to cover the shoulder portion 12 and the body portion 20 of the container body 10 except the mouth portion 11, the neck portion 13 and the bottom portion 30. As a result, desired functions and characteristics can be given to the shoulder 12 and the body 20 of the container body 10.

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

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

  Next, the configuration of the composite preform 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 bottomless cylindrical plastic member (shrinkable tube) 40a provided outside the preform 10a.

  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. 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.

  The plastic member (shrinkable tube) 40a is attached to the outer surface of the preform 10a without being adhered, and is adhered so as not to move or rotate with respect to the preform 10a or to the extent that it does not drop by its own weight. It is closely attached. The plastic member (shrinkable tube) 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 the portion 13a corresponding to the neck portion 13 of the container body 10.

  The plastic member (shrinkable tube) 40a may be provided in the whole area or a partial area other than the mouth portion 11a. For example, the plastic member (shrinkable tube) 40a may be provided so as to cover the entire body portion 20a including the neck portion 13. Alternatively, the plastic member (shrink tube) 40a may cover the entire region of the body portion 20a and a partial region of the bottom portion 30a. Further, the number of the plastic member (shrink tube) 40a is not limited to one, and a plurality of members may be provided. For example, two plastic members (contractile tubes) 40a may be provided at two locations outside the body portion 20a.

  Each layer of the plastic member (shrinkable tube) 40a is made of a resin material containing a polyester resin, a polyolefin resin, a polystyrene resin, a polycarbonate resin and / or a polyamide resin. Among them, the resin material preferably contains a polyester resin from the viewpoint of improving gas barrier properties such as oxygen barrier properties or water vapor barrier properties of the container body, and light barrier properties such as ultraviolet rays, and the ease of recycling. From this viewpoint, the resin composition preferably contains a polyolefin resin. Examples of the polyester-based resin include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene isophthalate and polyethylene naphthalate (PEN). Among these, the barrier properties and further mechanical strength are improved. Therefore, PET and PEN are preferable, and PEN is more preferable. Examples of the polyolefin-based resin include polyethylene (PE), polypropylene (PP), polybutene (PB), polymethylpentene, and ethylene-vinyl alcohol copolymer. Among them, the reason for easy moldability is mentioned. Therefore, PE and PP are preferable.

  In addition to the above-mentioned resins, resin materials include polylactic acid, polyvinyl chloride, poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl alcohol. , Polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluororesin, polymethylmethacrylate, polyacrylic acid, polymethylacrylate, 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 polyterephthalate, polyterephthalate Ren, ethylene ethylene polynaphthalene, 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, phenol Resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin and the like may be included.

  Further, the resin material may include a copolymer obtained by polymerizing two or more monomer units constituting the above resin. Further, the resin material may be a blended resin material containing two or more of the above resins. Further, the resin material may contain various additives in addition to the resin as the main component, as long as the characteristics are not impaired. Examples of the additive include a plasticizer, an ultraviolet stabilizer, a coloring preventing agent, a matting agent, a deodorant, a flame retardant, a weatherproofing agent, an antistatic agent, a thread friction reducing agent, a slip agent, a release agent, and an antistatic agent. Examples thereof include an oxidizing agent, an ion exchange agent, and a coloring pigment.

  Further, the resin material forming each layer of the plastic member (shrink tube) 40 (40a) may include the same material as the container body 10 (preform 10a). For example, the plastic member 40 (40a) may include a layer made of the same material as the container body 10 (preform 10a). In this case, in the composite container 10A, for example, the plastic member 40 can be placed in a concentrated manner in a portion where the strength is desired to be increased, and the strength in that portion can be selectively increased. For example, a plastic member 40 may be provided around the shoulder 12 of the container body 10 to increase the strength of this portion. Examples of such materials include polyolefin resins such as PE and PP, polyester resins such as PET and PEN, and polycarbonate resins.

  Further, the resin material forming each layer of the plastic member (shrinkable tube) 40 (40a) may include a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. For example, the plastic member 40 (40a) may include a layer (gas barrier layer) made of 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 blend material as the preform 10a, the gas barrier property of the composite container 10A is enhanced, oxygen is prevented from entering the container, 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 decrease of the internal volume. For example, a plastic member 40 may be provided on the entire area of the shoulder 12, the neck 13, the body 20, and a part of the bottom portion 30 of the container body 10 to enhance the gas barrier property of this portion. Examples of such a material include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), PEN (polyethylene naphthalate), or these. It is also possible to mix an oxygen absorbing material such as a fatty acid salt with the material.

  Further, the resin material forming each layer of the plastic member (shrinkable tube) 40 (40a) may include a material having a light ray barrier property against ultraviolet rays and the like. For example, the plastic member 40 (40a) may include a layer (light barrier layer) made of a material having a light barrier property against ultraviolet rays and the like. In this case, without using a multi-layer preform or a preform containing a blend material as the preform 10a, 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. For example, the container body 10 may be provided with a plastic member 40a over the entire area of the shoulder portion 12, the neck portion 13, the body portion 20 and a part of the bottom portion to enhance the ultraviolet barrier property of this portion. As such a material, a resin material containing two or more kinds of the above-mentioned resins, or a material obtained by adding a light-shielding resin to PET, PE or PP is considered. Further, 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 resin material forming each layer of the plastic member (shrink tube) 40 (40a) has a higher heat retention property or a higher heat retention property (heat conductivity) than the plastic material forming the container body 10 (preform 10a). (Low material) may be included. For example, the plastic member 40 (40a) is a layer (low thermal conductivity layer) made of a material having a higher heat retention property or a lower heat retention property (a material having lower heat conductivity) than the plastic material forming the container body 10 (preform 10a). ) May be provided. 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. Thereby, the heat retaining property or the cold retaining property of the composite container 10A is enhanced. For example, a plastic member 40 may be provided on all or part of the body portion 20 of the container body 10 to enhance the heat retaining property or the cold retaining property of the body portion 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. Examples of such a material include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like. Hollow particles are preferably mixed with the resin material. The average particle diameter 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, Nanotrac particle size distribution measuring device, manufactured by Nikkiso Co., Ltd.). can do. The hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of a glass or the like. Hollow particles are preferred. Examples of the resin forming the organic hollow particles include styrene-based resins such as cross-linked styrene-acrylic resins, (meth) acrylic resins such as acrylonitrile-acrylic resins, phenol-based resins, fluorine-based resins, polyamide-based resins, polyimides. Examples of the resin include a resin, a polycarbonate resin, and a polyether resin. In addition, low pake HP-1055, low pake HP-91, low pake OP-84J, low pake ultra, low pake SE, low pake ST (manufactured by Rohm and Haas Co., Ltd.), nipol MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782. Alternatively, commercially available hollow particles such as SX866 (manufactured by JSR Corporation) can 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 material contained in each layer of the plastic member 40a. preferable.

  The resin material forming each layer of the plastic member (shrinkable tube) 40 (40a) may include a material that is less slippery than the plastic material forming the container body 10 (preform 10a). For example, the plastic member 40 (40a) may include a layer made of a material that is less slippery than a plastic material as the outermost layer. In this case, the user can easily hold the composite container 10A without changing the material of the container body 10. For example, a plastic member 40 may be provided on all or part of the body 20 of the container body 10 to facilitate holding the body 20.

  Each layer of the plastic member (shrinkable tube) 40 (40a) can include at least a colorant in addition to the above resin material. As the colorant, a colorant such as brown, black, green, white, blue or red can be used. The colorant may be a pigment or a dye, but is preferably a pigment from the viewpoint of light resistance. Among the above-mentioned coloring agents, which are light-reflecting pigments, white pigments such as titanium white, aluminum powder, mica powder, zinc sulfide, zinc white, calcium carbonate, kaolin, and talc, which are light-absorbing pigments, carbon black, Colored pigments such as ceramic black and bone black are preferred. When the colored layer contains such a pigment, the visible light transmittance of the plastic member 40 after blow molding can be reduced, and the quality change of the content liquid filled in the composite container 10A can be prevented. can do. Further, the plastic member 40a may be transparent or opaque.

  Furthermore, the plastic member (shrink tube) 40 (40a) may be designed or printed. In this case, it is possible to display an image or a character on the composite container 10A without separately adding 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 part of the body 20 of the container body 10 to display images and characters on the body 20. In this case, the material of the plastic member 40 may be the same as that of the container body 10 or may be different from that of the container body 10. The printing may be performed by designing or printing on the plain plastic member 40a by a printing method such as an inkjet method, a gravure printing method, an offset printing method, or a flexographic printing method. For example, in the case of using the inkjet method, the printing layer can be formed by applying the UV curable ink to the plastic member 40a, irradiating it with UV, and curing it. This printing may be performed on the plastic member (shrinkable tube) 40a before being attached to the preform 10a, or may be performed with the plastic member 40a provided on the outside of the preform 10a. Furthermore, the plastic member 40 of the composite container 10A after blow molding may be printed.

  The plastic member 40 (40a) is composed of multiple layers as described above, and for example, the main components forming the layers of the innermost surface and the outermost surface may be the same or different. Specific layer configurations include, from the innermost surface, low density PE / adhesive layer / EVOH / adhesive layer / low density PE, and PP / adhesive layer / EVOH / adhesive layer / PP. As the adhesive constituting the adhesive layer, for example, polyvinyl acetate adhesive, polyacrylic ester adhesive, cyanoacrylate adhesive, ethylene copolymer adhesive, cellulose adhesive, polyester adhesive, Examples thereof include polyamide adhesives, polyimide adhesives, amino resin adhesives, phenol resin adhesives, epoxy adhesives, polyurethane adhesives, rubber adhesives and silicone adhesives.

  Next, the shape of the plastic member (shrinkable tube) 40a will be described.

  As shown in FIGS. 3 and 4, the plastic member (shrinkable tube) 40a preferably has a bottomless cylindrical shape as a whole. By providing such a plastic member 40, various functions and characteristics can be given to the body portion 20 of the composite container 10A.

In the composite container 10A shown in FIG. 1, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to a lower portion of the body portion 20. Further, in the composite preform 70 shown in FIG. 3, the plastic member (shrink tube) 40a is adhered so as to cover only the body portion 20a of the preform 10a, and more specifically, the container body of the body portion 20a. 10 covers a region except a portion 13a corresponding to the neck portion 13 and a portion corresponding to a lower portion of the body portion 20a. The present invention is not limited to this, and the plastic member 40 may cover a part or the whole area of the bottom of the container body 10. Similarly, the plastic member (shrinkable tube) 40a is It may cover a part of the bottom portion 30a of the preform 10a.
The same applies to the following aspects.

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

  The plastic member 40a is manufactured by a method including an extrusion molding step. More specifically, first, two or more kinds of resin materials are heated and melted in an extruder, and the melted resin materials are continuously co-extruded from a ring die. Note that a colorant or the like may be mixed with the resin material that is co-extruded. Next, the co-extruded resin material is cooled to be molded into the unstretched multilayer extruded tube 1 (see FIG. 5A). By welding or adhering one end of the unstretched multilayer extruded tube 1, one end of the multilayer extruded tube 1 is closed. Next, the multilayer extruded tube 1 whose one end is closed is placed in a tubular mold 2 (see FIG. 5 (b)). The inner diameter of the mold 2 is larger than the outer diameter of the multilayer extrusion tube 1. Next, the blow device 3 is arranged (mounted) at the other end of the multilayer extrusion tube 1 (see FIG. 5C). At this time, it is preferable that the blowing device 3 is closely attached to the multilayer extrusion tube 1 so that air does not leak between them. Then, the multilayer extrusion tube 1, the mold 2, and the blowing device 3 are sent to the heating furnace 4 in this arrangement and heated to 70 to 150 ° C. inside the heating furnace 4 (see FIG. 5D). As the heating furnace 4, a hot air circulation type heating furnace may be used in order to make the inside thereof have a uniform temperature. Alternatively, the multilayer extruded tube 1, the mold 2, and the blowing device 3 may be heated by passing them through a heated liquid. Next, the multi-layer extruded tube 1, the mold 2 and the blowing device 3 are taken out from the heating furnace 4, and air is blown into the multi-layer extruded tube 1 from the blow device 3 to press and stretch the inner surface of the multi-layer extruded tube 1. To do. As a result, the multilayer extruded tube 1 is expanded and expanded in diameter along the shape of the inner surface of the mold 2 (see FIG. 5 (e)). After that, the multilayer extrusion tube 1 is cooled in cold water while the air is ejected from the blower 3, and the multilayer extrusion tube is taken out from the mold 2 (see FIG. 5 (f)). A plastic member 40a is obtained by cutting this into a desired size (see FIG. 5 (g)).

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

  First, a preform 10a made of a plastic material is prepared (see FIG. 6 (a)). In this case, the preform 10a may be manufactured by an injection molding method using, for example, an injection molding machine (not shown).

  Next, the plastic member (shrinkable tube) 40a is loosely inserted on the outside of the preform 10a (see FIG. 6B). In this case, the plastic member (shrinkable tube) 40a has a bottomless cylindrical shape as a whole and has a cylindrical body portion 41. The plastic member (shrinkable tube) 40a covers the entire body portion 20a except the portion corresponding to the neck portion 13 of the container body 10.

  Next, the preform 10a and the plastic member (shrinkable tube) 40a are heated by the heating device 51 (see FIG. 6C). As a result, the composite preform 70 having the preform 10a and the plastic member (shrinkable tube) 40a adhered to the outside of the preform 10a can be manufactured. At this time, the preform 10a and the plastic member (shrinkable tube) 40a are evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth 11a facing downward. The heating temperature of the preform 10a and the plastic member (shrinkable tube) 40a in this heating step may be, for example, 90 ° C to 130 ° C.

  By heating the plastic member (shrinkable tube) 40a in this manner, the plastic member (shrinkable tube) 40a is thermally shrunk and adheres to the outside of the preform 10a (see FIG. 6C). If the plastic member (shrinkable tube) 40a itself has a shrinkability, the plastic member (shrinkable tube) shrinks at the time when the plastic member (shrinkable tube) 40a is provided outside the preform 10a (see FIG. 6B). The tube 40a may be in close contact with the outside of the preform 10a.

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 6D).

  The composite container 10A is molded using this blow molding die 50. In this case, the blow molding die 50 is composed of a pair of body portion dies 50a and 50b and a bottom portion die 50c which are divided from each other (see FIG. 6D). In FIG. 6D, the pair of body dies 50a and 50b are open from each other, and the bottom die 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. 6 (e), after the bottom mold 50c is lowered, the pair of body molds 50a, 50b are closed, and the pair of body molds 50a, 50b and the bottom mold 50c are used. A closed blow molding die 50 is constructed. Next, air is pressed into the preform 10a, and the composite preform 70 is biaxially stretch blow molded.

  As a result, the container body 10 is obtained from the preform 10a in the blow molding die 50. During this time, the body dies 50a and 50b are heated to 30 ° C to 80 ° C, and the bottom die 50c is cooled to 5 ° C to 25 ° C. At this time, in the blow mold 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 formed 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. 6F, the pair of barrel dies 50a and 50b and the bottom die 50c are separated from each other, and the composite container 10A is taken out from the blow molding die 50.

Modification of manufacturing method of composite container 10A

  Next, another modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. The modified example shown in FIGS. 7A to 7G is to heat the preform 10a and the plastic member (shrinkable tube) 40a in two stages, and other configurations are shown in FIGS. ) Is substantially the same as the form shown in FIG. 7A to 7G, the same parts as those in FIGS. 6A to 6F 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 (shrinkable tube) 40a is loosely inserted on the outside of the preform 10a (see FIG. 7B). In this case, the plastic member (shrinkable tube) 40a has a bottomless cylindrical shape as a whole and has a cylindrical body portion 41. The plastic member (shrinkable tube) 40 is attached so as to cover the entire body portion 20a except the portion corresponding to the neck portion 13 of the container body 10.

  Next, the preform 10a and the plastic member (shrinkable tube) 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 (shrinkable tube) 40a may be, for example, 50 ° C to 100 ° C.

  By heating the plastic member (shrinkable tube) 40a, the plastic member (shrinkable tube) 40a is thermally shrunk and adheres to the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and the plastic member (shrinkable tube) 40a adhered to the outside of the preform 10a is obtained (see FIG. 7C).

  As described above, the composite preform 70 is prepared by preliminarily heating and closely adhering the plastic member (shrinkable tube) 40a to the outside of the preform 10a using the first heating device 55. A series of steps for manufacturing (FIGS. 7 (a) to 7 (c)) and a series of steps for manufacturing the composite container 10A by blow molding (FIGS. 7 (d) to 7 (g)) are provided at different places (factory or the like). Can be implemented in.

  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 (shrinkable tube) 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). In this case, the heating for shrinking the plastic member (shrink tube) 40a and the heating for blow molding the preform 10a can be performed in the same step.

  The composite preform 70 is molded using this 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 FIGS. 6A to 6F described above. The composite container 10A including the contracted tube (contracted tube) 40 is obtained (see FIGS. 7E to 7G).

  As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are formed. It is inflated as a unit to produce a composite container 10A including the container body 10 and the plastic member 40. Accordingly, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be configured as separate members. Therefore, various functions and characteristics can be freely added 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 device can be used as it is, so that it is necessary to prepare new molding equipment for manufacturing the composite container 10A. Absent. Further, since the plastic member 40a is provided on the outside of the preform 10a, it is not necessary to prepare new molding equipment for molding the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 8 to 13 are views showing a second embodiment of the present invention. 8 to 13, the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

  First, an outline of a composite container manufactured by the blow molding method according to the present embodiment will be described with reference to FIGS. 8 and 9.

  The composite container 10A shown in FIGS. 8 and 9 is a composite preform 70 (see FIG. 10) including a preform 10a, an inner label member 60a and a plastic member 40a using a blow molding die 50, as described later. By biaxially stretch blow molding, the preform 10a of the composite preform 70, the inner label member 60a, and the plastic member 40a are integrally expanded and obtained.

  Such a composite container 10A is provided inside a container body 10 made of a plastic material, an inside label member 60 closely attached to the outside of the container body 10, and an outside label of the inside label member 60. And a plastic member 40 that has been formed.

  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, and a body portion 20 provided below the shoulder portion 12, And a bottom portion 30 provided below the body 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 a multi-layer shrink tube, and is adhered to the outer surface of the container body 10 and the outer surface of the inner label member 60 in a thinly extended state, and easily moves with respect to the container body 10. Or, they are so closely attached that they do not rotate, or so closely that they do not fall under their own weight.

  It is conceivable that at least a part of the plastic member 40 is translucent or transparent, and in this case, the inner label member 60 is visible from the outside through the translucent or transparent part. The entire plastic member 40 may be semitransparent or transparent, or may have an opaque portion and a semitransparent or transparent portion (for example, a window portion). In the present embodiment, the case where the entire plastic member 40 is transparent will be described as an example.

  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 integrally biaxially stretch-blow molding 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, or in such a degree that it does not drop by its own weight. .. 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. 7, the inner label member 60 is provided over the entire area in the 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 and the body portion 20 of the container body 10 excluding the mouth portion 11, the neck portion 13 and the bottom portion 30. As a result, desired characters, images, etc. can be given to the shoulder portion 12 and the body portion 20 of the container body 10 so that the composite container 10A can be decorated and information can be displayed.

  The inner label member 60 may be provided in the whole 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 a part of the neck portion 13, the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10 excluding the mouth portion 11. Alternatively, the inner label member 60 may be provided so as to cover the entire area of the neck portion 13, the entire area of the shoulder portion 12, the entire area of the body portion 20, and a part of the bottom portion 30. Further, the inner label member 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 region as the plastic member 40, or may be provided in a region narrower than the plastic member 40. In the latter case, the inner label member 60 is preferably completely covered by the plastic member 40.

  Further, the thickness of the inner label member 60 is not limited to this, but may be, for example, about 5 μm to 50 μm in a state of being attached to the container body 10.

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

  The plastic member 40 is attached to the outer surface of the inner label member 60 without being adhered, and is adhered so as not to move or rotate with respect to the container body 10, or so closely that it does not drop by its own weight. There is. 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. 8, the plastic member 40 is provided over the entire region in the circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

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

  Next, the structure of the composite preform according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 10, the composite preform 70 includes a preform 10a made of a plastic material, a bottomless cylindrical inner label member 60a provided in close contact with the outside of the preform 10a, and an inner label member 60a. And a bottomless cylindrical plastic member 40a provided in close contact with the outside.

  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, or is in close contact with the preform 10a to the extent that it does not drop by its own weight. The inner label member 60a is provided over the entire area in the circumferential direction so as to surround the preform 10a and has a substantially circular horizontal cross section.

  The inner label member 60a may be designed or printed in advance. For example, in addition to the design, product name, etc., character information such as the name of the content liquid, manufacturer, raw material name, etc. may be described. In this case, it is possible to display an image or a character on the composite container 10A without separately adding 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 images and characters are displayed on the body portion 20 of the container body 10 after molding. This eliminates the need for a step of applying a label using a labeler after the container is tightly capped, so that the manufacturing cost can be suppressed and the yield can be prevented from decreasing.

  As such an inner label member 60a, a film made of a polyester resin, a polyamide resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, a fluorine resin, a blended material thereof, or the like is used. You can 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, various materials described below can be used as the inner label member 60a.

  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, without using a multi-layer preform or a preform containing a blend material as the preform 10a, the gas barrier property of the composite container 10A is enhanced, oxygen is prevented from entering the container, 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 decrease of the internal volume. Examples of such a material include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), EVOH (ethylene vinyl alcohol copolymer), PEN (polyethylene naphthalate), or oxygen such as fatty acid salt in these materials. It is also possible to mix an absorbent material.

  Further, the inner label member 60a may be made of a material having a ray barrier property against ultraviolet rays and the like. In this case, without using a multi-layer preform or a preform containing a blend material as the preform 10a, 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. As such a material, a blend material or a material in which a light-shielding resin is added to PET, PE, or PP can be considered.

  The inner label member 60a may be made of a material having a higher heat retention property or a lower heat retention property (a material having a lower heat conductivity) than the plastic material forming 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 transferred to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. Thereby, the heat retaining property or the cold retaining property of the composite container 10A is enhanced. Examples of such a material include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like. The inner label member 60a preferably further contains hollow particles. The average particle diameter of the hollow particles is preferably 1 to 200 μm, more preferably 5 to 80 μm. The hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of a glass or the like, but the organic particles are excellent because of excellent dispersibility. Hollow particles are preferred. As the resin constituting the organic hollow particles, the same resins as those mentioned above can be mentioned. Further, the 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.

  On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without being adhered, and is adhered to the preform 10a so as not to move or rotate, or to such an extent that it does not drop by its own weight. Has been done. The plastic member 40a is provided over the entire area in the 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 the portion 13a corresponding to the neck portion 13 of the container body 10.

  The inner label member 60a and the plastic member 40a may be provided in the whole area or a partial 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 including the neck portion 13. Further, each of the inner label member 60a and the plastic member 40a is not limited to one, but a plurality of members may be provided. For example, the two inner label members 60a and the plastic member 40a may be provided at two positions outside the body portion 20a.

  The plastic member 40a has a function of contracting with respect to the preform 10a (contraction tube), and the plastic member (contraction tube) 40a has a function of contracting with respect to the preform 10a. If there is no particular limitation. As the plastic member (shrink tube) 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, the configurations of the preform 10a and the plastic member 40a are substantially the same as those in the above-described first embodiment, and therefore 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 FIG. 11, it is preferable that the plastic member 40a (inner label member 60a) has a cylindrical body portion 41 (body portion 61) that has a bottomless cylindrical shape as a whole.
In this case, various functions and characteristics can be given to the 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.

  First, a preform 10a made of a plastic material is prepared (see FIG. 12 (a)).

  Next, the inner label member 60a is provided on the outer side of the preform 10a, and the plastic member (shrinkable tube) 40a is provided on the outer side of the inner label member 60a (see FIG. 12B). The inner label member 60a and the plastic member (shrinkable tube) 40a are attached so as to cover the entire body portion 20a except the portion corresponding to the neck portion 13 of the container body 10. At least a part of the plastic member (shrinkable tube) 40a may be translucent or transparent.

  In this case, a plastic member (shrinkable tube) 40a is provided around the inner label member 60a in advance, and the inner label member 60a and the plastic member (shrinkable tube) 40a are integrally attached to the outside of the preform 10a. Is also good. Alternatively, the inner label member 60a may be provided on the outer side of the preform 10a, and then the plastic member (shrink tube) 40a may be provided on the outer side of the inner label member 60a.

  Next, the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a are heated by the heating device 51 (see FIG. 12C). At this time, the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 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 60a, and the plastic member (shrinkable tube) 40a in this heating step may be, for example, 90 ° C to 130 ° C.

  By heating the plastic member (shrinkable tube) 40a in this manner, the plastic member (shrinkable tube) 40a is thermally shrunk and adheres to the outside of the preform 10a (see FIG. 12C). When the plastic member (shrinkable tube) 40a itself has shrinkability, the plastic member (shrinkable tube) 40a is provided outside the inner label member 60a (see FIG. 12B) at the time when the plastic member (shrinkable tube) 40a is provided. The contraction tube) 40a may be in close contact with the outside of the inner label member 60a.

  Then, the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 12D).

  The preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a are molded using this blow molding die 50, and in substantially the same manner as in the case of FIGS. 12 (a) to (f) described above, A composite container 10A including the container body 10, the inner label member 60a provided on the outer surface of the container body 10, and the plastic member (shrinkable tube) 40 provided on the outer side of the inner label member 60a is obtained (FIG. 12 (d) to (f)).

  Next, another modified example of the method (blow molding method) for manufacturing the composite container 10A according to the present embodiment will be described with reference to FIGS. The modified example shown in FIGS. 13 (a) to 13 (g) heats the preform 10a and the plastic member (shrinkable tube) 40a in two stages. Other configurations are shown in FIGS. 12 (a) to 12 (f). ) Is substantially the same as the form shown in FIG. 13A to 13G, the same parts as those in FIGS. 12A to 12F are denoted 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. 13 (a)).

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

  In this case, a plastic member (shrinkable tube) 40a is provided around the inner label member 60a in advance, and the inner label member 60a and the plastic member (shrinkable tube) 40a are integrally attached to the outside of the preform 10a. Is also good. Alternatively, the inner label member 60a may be provided on the outer side of the preform 10a, and then the plastic member (shrink tube) 40a may be provided on the outer side of the inner label member 60a.

  Next, the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a are heated by the first heating device 55 (see FIG. 13C). At this time, the heating temperature of the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a may be, for example, 50 ° C to 100 ° C.

  By heating the plastic member (shrinkable tube) 40a, the plastic member (shrinkable tube) 40a is thermally shrunk and adheres to the outside of the preform 10a. Thereby, the 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 (shrink tube) 40a adhered to the outer side of the inner label member 60a is obtained. (See FIG. 13C).

  In this manner, by using the first heating device 55 to heat and closely adhere the plastic member (shrinkable tube) 40a to the outside of the preform 10a and the inner label member 60a in advance, the composite preform 70 is produced. A series of steps for manufacturing the composite preform 70 (FIGS. 13A to 13C) and a series of steps for manufacturing the composite container 10A by blow molding (FIGS. 13D to 13G) are separately performed. It becomes possible to carry out at a place (factory etc.).

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 13D). 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 60a, and the plastic member (shrinkable tube) 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. 13 (e)).

  The composite preform 70 is molded using this 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 FIGS. 12 (a) to 12 (f) described above. The composite container 10A including the inner label member 60 and the plastic member (shrinkable tube) 40 provided outside the inner label member 60 is obtained (see FIGS. 13E to 13G).

As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding die 50, the preform 10a of the composite preform 70, the inner label member 60a, and The plastic member 40a is integrally expanded to produce a composite container 10A including the container body 10, the inner label member 60, and the plastic member 40. Therefore, at the stage of manufacturing the composite container 10A using the preform 10a, the inner label member 60 can be provided in advance in the composite container 10A. Therefore, it is not necessary to provide a step of applying a label by the labeler after the composite container 10A is filled with the content liquid and hermetically sealed. Thereby, the manufacturing cost for manufacturing the final product can be suppressed.
Further, it is possible to prevent the yield from being reduced when the final product is manufactured due to a malfunction 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 configured as separate members. Therefore, various functions and characteristics can be freely added 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 device can be used as it is, so that it is necessary to prepare new molding equipment for manufacturing the composite container 10A. Absent.

Claims (1)

In the method of manufacturing a composite container,
A step of preparing a preform made of a plastic material,
Providing a plastic member on the outside of the preform,
Heating the preform and the plastic member and inserting them into a blow molding die;
By subjecting the preform and the plastic member to blow molding in the blow molding die, inflating the preform and the plastic member as a unit,
The method for producing a composite container, wherein the plastic member is a shrinkable tube having multiple layers.

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