JP6709527B2 - Composite preform, composite container, plastic member, and method for manufacturing plastic member - Google Patents

Description

The present invention relates to a composite preform, a composite container, a plastic member, and a method for manufacturing 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 is capable of imparting various functions and characteristics to a container, a blow molding method, a composite preform, a composite container, an inner label member, and a plastic. An object is to provide a manufacturing member.

The composite preform of the present invention is
A preform made of plastic material,
A plastic member of an inflation film molded article, which is provided so as to surround the outside of the preform,
The plastic member comprises a crosslinked resin material.

In the above aspect, it is preferable that the crosslinked resin material is a resin material crosslinked by irradiation with actinic rays or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

In the above aspect, the plastic member preferably contains a crosslinking agent and/or a crosslinking aid.

The composite container of the present invention is
A container body made of plastic material,
Provided in close contact with the outside of the container body, comprising an inflation film molded plastic member,
The plastic member is characterized by comprising a cross-linked resin material.

In the above aspect, it is preferable that the crosslinked resin material is a resin material crosslinked by irradiation with actinic rays or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

In the above aspect, the plastic member preferably contains a crosslinking agent and/or a crosslinking aid.

The plastic member of the present invention is
A plastic member for manufacturing a composite container having a preform and a plastic member adhered to the outside of the preform by being mounted so as to surround the outside of the preform and being integrally heated with the preform. And
The plastic member is an inflation film molded product having a tubular body that covers at least the body of the preform,
It is characterized in that it comprises a cross-linked resin material.

In the above aspect, it is preferable that the crosslinked resin material is a resin material crosslinked by irradiation with actinic rays or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

In the above-mentioned aspect, it is preferable to include a crosslinking agent and/or a crosslinking aid.

The method for manufacturing a plastic member of the present invention is
A plastic member for manufacturing a composite container having a preform and a plastic member adhered to the outside of the preform by being mounted so as to surround the outside of the preform and being heated integrally with the preform. In the manufacturing method of
A step of heating and melting a mixture containing a crosslinkable resin material,
A step of extruding the heat-melted mixture by an inflation method,
Cross-linking the cross-linkable resin material in the extruded mixture,
It is characterized by comprising.

In the above aspect, the step of crosslinking the crosslinkable resin material is preferably performed by actinic ray irradiation treatment or water crosslinking treatment on the extrusion molded mixture.

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. Furthermore, since the plastic member contains a crosslinked resin material, the heat resistance, abrasion resistance, solvent resistance and heat shrinkability of the plastic member can be improved.

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. 4A and 4B are perspective views showing various plastic members. FIG. 5 is a schematic view showing an embodiment of a method for producing an inflation film molded product. FIGS. 6A to 6F are schematic views showing the method for manufacturing the composite container according to the first embodiment of the present invention. FIG. 7 is a partial vertical sectional view showing a modified example of the composite container according to the first embodiment of the present invention. FIG. 8 is a vertical sectional view showing a modified example of the composite preform according to the first embodiment of the present invention. 9A to 9F are schematic views showing a modified example of the method for manufacturing the composite container according to the first embodiment of the present invention. FIG. 10 is a partial vertical sectional view showing a composite container according to the second embodiment of the present invention. FIG. 11 is a horizontal cross-sectional view (cross-sectional view taken along the line XI-XI of FIG. 10) showing the composite container according to the second embodiment of the present invention. FIG. 12 is a vertical cross-sectional view showing a composite preform according to the second embodiment of the present invention. 13A and 13B are perspective views showing various inner label members and various plastic members. 14A to 14F are schematic views showing a method for manufacturing a composite container according to the second embodiment of the present invention. FIG. 15 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention. FIG. 16 is a vertical sectional view showing a modified example of the composite preform according to the second embodiment of the present invention. 17A to 17F are schematic views showing a modified example of the method for manufacturing the composite container according to 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 9 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 ).

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

The container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a body portion 20 provided below the shoulder portion 12, and a body portion And a bottom portion 30 provided below the 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 in which it does not easily move or rotate.

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).

Further, 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 when the content volume of the container body 10 is 500 mL, for example. 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 injection molding, for example, the intermediate layer is used as a resin (intermediate layer) having gas barrier properties and light shielding properties, such as MXD6, MXD6+ fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN. The preform 10a having three or more layers may be 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.

Such a container body 10 may be composed of a bottle having a full volume of 100 mL to 2000 mL, for example. 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 an inflation film molded product, is provided so as to surround the outside of the preform 10a as described later, and is attached to the outside of the preform 10a and then biaxially stretched together with the preform 10a. It is obtained by blow molding.

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.

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 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, the body portion 20, and the bottom portion 30 of the container body 10 except the mouth portion 11. 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 shoulder 12 and the outer surface of the bottom 30, respectively.

On the other hand, since the plastic member 40 is not welded or adhered to the container body 10, it can be peeled off and removed from the container body 10. Specifically, for example, the plastic member 40 is cut off using a knife or the like, or a cutting line (not shown) is provided in advance on the plastic member 40, and the plastic member 40 is peeled along the cutting line. You can 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, the plastic member 40 may be composed of a single layer or may be composed of multiple layers.

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, in one embodiment, the composite preform 70 includes a preform 10a made of a plastic material and a bottomed cylindrical plastic member 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 40a is attached to the outer surface of the preform 10a without being bonded. The plastic member 40a is provided over the entire area in the 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 region of the body 20a excluding the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a.

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

The plastic member 40a (40) includes a crosslinked resin material. Since the plastic member 40a (40) contains the crosslinked resin material, the heat resistance, abrasion resistance, and solvent resistance of the plastic member 40a (40) can be improved. In addition, by the blow molding for manufacturing the composite container 10A, the heat shrinkability is exhibited, and the adhesiveness between the container body 10 and the plastic member 40 can be enhanced.

The crosslinked resin material contained in the plastic member 40a (40) is subjected to (1) actinic ray irradiation treatment or (2) water crosslinking treatment to the crosslinkable resin material, as described later. Can be obtained.

Examples of the crosslinkable resin material that crosslinks by being subjected to an actinic ray irradiation treatment include PE, PP, polystyrene, polyvinylidene fluoride, polymethyl acrylate, polyvinyl chloride, polybutadiene, natural rubber, vinyl alcohol, polyamide resin, ethylene acetic acid. Vinyl copolymer (EVA), etc. are mentioned.

Examples of the crosslinkable resin material that is crosslinked by the water crosslinking treatment include a silane crosslinkable polyolefin resin that forms a siloxane bond (Si-O-Si) by the water crosslinking treatment. The silane crosslinkable polyolefin resin can be obtained by copolymerizing ethylene with an ethylene-modified unsaturated silane compound. Examples of the ethylenically unsaturated silane compound include vinyltrimethoxysilane, vinyltriethoxysilane, vinylacetoxysilane, γ-methacryloxypropylmethyldimethoxysilane, and the like.
Further, in one embodiment, the silane-crosslinkable polyolefin resin is a polyolefin resin such as low-density polyethylene, in the presence of an unsaturated silane compound such as vinylmethoxysilane and a free radical generator such as dicumyl peroxide, a free radical. It can be obtained by heating above the decomposition temperature of the generator.
As the silane crosslinkable polyolefin resin, a commercially available one may be used. For example, Mitsubishi Chemical Co., Ltd. of the link Ron XLE815N, XCF710N, XCF730N, XHE740N, XHE650N, HM600A, XVF600N, XPM800HM, XPF860G, SS732N, LBC021-2, cited XCF800N, LBC022-1, PK500N, such as LY5-3 and PM700N is Be done.

The content of the crosslinked resin material in the plastic member 40a (40) is preferably 60% by mass or more and 100% by mass or less, and more preferably 75% by mass or more and 100% by mass or less. By setting the content of the crosslinked resin material within the above numerical range, the heat resistance, abrasion resistance, solvent resistance and heat shrinkability of the plastic member 40a (40) can be more significantly improved.

Further, the plastic member 40a (40) is, for example, polylactic acid, poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinylidene chloride, polyvinyl acetate as long as its characteristics are not impaired. , Polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluorine resin, polymethyl methacrylate, polyacrylic acid, polyacrylonitrile, polyacrylamide, polybutene-1, nylon 6, nylon 6,6, nylon MXD6, aromatic polyamide, Polycarbonate, ethylene polyterephthalate, butylene polyterephthalate, ethylene polynaphthaleneate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, Other resin materials such as polyether sulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal and epoxy resin may be contained.
Further, the plastic member 40a (40) may include a copolymer obtained by polymerizing two or more monomer units constituting the above resin. Further, the plastic member 40a (40) may include two or more kinds of the above resins. Further, a blended material thereof, a multi-layer structure, or a partially multi-layer structure may be used.

The plastic member 40a (40) preferably contains a cross-linking agent, and examples of the cross-linking agent include hexamethylenediamine carbamate, dioltotolyl guanidine, dicumyl peroxide, and 1,3-phenylene bisoxazoline. Is mentioned.

The content of the crosslinking agent is preferably 0.1 to 5 parts by mass, when the total amount of the crosslinked resin material contained in the plastic member 40a (40) is 100 parts by mass, and 0.1 It is more preferable that the amount is ˜2 parts by mass.

Further, the plastic member 40a (40) preferably contains a cross-linking aid, and examples of the cross-linking agent include triallyl isocyanurate, triallyl cyanurate, diallyl fumarate, trimethylolpropane trimethacrylate, and triethyl methacrylate. Methylolpropane triacrylate, ethylene glycol dimethacrylate and the like can be mentioned.

The content of the cross-linking aid is preferably 0.1 to 5 parts by mass, when the total amount of the cross-linked resin material contained in the plastic member 40a (40) is 100 parts by mass, and 0.1. It is more preferably 1 to 2 parts by mass.

When the crosslinkable resin material is a material that is crosslinked by subjecting it to a water crosslinking treatment, the plastic member 40a (40) preferably contains a silanol condensation catalyst. Any silanol condensation catalyst can be used without particular limitation as long as it can promote dehydration condensation between silanols. Examples thereof include metal carboxylates such as tin, zinc, iron and cobalt, organic bases, inorganic acids or organic acids, and more specifically, dibutyltin dilaurate, dibutyltin acetate, dioctyltin dilaurate and the like.

The content of the silanol condensation catalyst in the plastic member 40a (40) is 0.1 parts by mass or more and 10 parts by mass or less based on 100 parts by mass of the total amount of the crosslinked resin material contained in the plastic member 40a (40). Is preferred, and more preferably 1 part by mass or more and 5 parts by mass or less. By setting the content of the silanol condensation catalyst in the above numerical range, the crosslinking reaction can be favorably performed, and the heat resistance, abrasion resistance, solvent resistance and heat shrinkability of the plastic member 40a (40) are improved. be able to.

Further, the plastic member 40 (40a) may be added with various additives other than the above-mentioned resin as the main component as long as the characteristics thereof 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. An oxidizing agent, an ion exchange agent, a coloring pigment, etc. can be added. Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foamed member having a foamed cell diameter of 0.5 to 100 μm is used, and this foamed preform is molded. It is possible to improve the light blocking effect.

Further, the plastic member 40a (40) may include the same material as the preform 10a (container body 10). In this case, in the composite container 10A, for example, the plastic member 40a (40) can be arranged in a concentrated manner in a portion where the strength is desired to be increased, and the strength of the location 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, polystyrene resins such as PS, and the like.

Further, the plastic member 40a (40) may include 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. As such a material, it is possible to mix PE, PP, MXD-6, PGA, EVOH, PEN, or an oxygen absorbent such as a fatty acid salt with these materials.

Further, the plastic member 40a (40) may include a material having a light 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. 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 plastic member 40a (40) may include a material having a higher heat retention property or a lower heat retention property (a material having a lower thermal conductivity) than the plastic material forming the preform 10a (the container body 10). 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. 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. Hollow particles are preferably mixed with a resin material containing these resins. 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. It is also possible to use commercially available hollow particles such as SX866 (manufactured by JSR Corporation). 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. It is more preferably about 20 to 20 parts by mass. When the plastic member 40a is composed of multiple layers, it is preferably 0.01 to 50 parts by mass with respect to 100 parts by mass of the resin material contained in the layer of the plastic member 40a containing hollow particles. It is more preferably about 20 to 20 parts by mass.

Further, the plastic member 40a (40) may include a material that is less slippery than the plastic material forming the preform 10a (container body 10). 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.

Furthermore, the plastic member 40a (40) 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. Printing can be performed by a printing method such as an inkjet method, a gravure printing method, an offset printing method, a flexographic printing method, or the like. For example, when the inkjet method is used, a UV curable ink is applied to the plastic member 40a (40), UV irradiation is performed on the UV curable ink, and the ink is cured to form a print layer. This printing may be performed on the plastic member 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 40a (40) may be composed of multiple layers as described above. For example, the main components forming the innermost surface layer and the outermost surface layer may be the same or different. ..

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

As shown in FIG. 4A, the plastic member 40a can be produced by cutting the inflation film into a desired length. In this case, as shown in FIG. 4( a ), the plastic member 40 a may have a tubular shape (a bottomless cylindrical shape) having a body portion 41, and as shown in FIG. 4( b ), The bottom portion 42 may be formed into a bottomed tubular shape by fusing, welding, or adhering.

Next, a method for manufacturing the plastic member 40a, which is an inflation film molded product, will be described.

The plastic member 40a is
A step of heating and melting a mixture containing the above-mentioned crosslinkable resin material,
A step of extruding the heat-melted mixture by an inflation method,
Cross-linking the cross-linkable resin material in the extruded mixture,
An inflation film molded product obtained by a method comprising:

More specifically, as shown in FIG. 5, first, after the mixture containing the crosslinkable resin material is dried, the mixture is heated to a temperature (Tm) to Tm+70° C. above the melting point of the crosslinkable resin material. The molten resin is supplied to the melt extruder 11, melted by heating, and extruded from the annular die 10 as a cylindrical resin melt.
Next, air is blown into this cylindrical resin melt by a conventional method to form bubbles 12. The bubble 12 is pressurized when passing between the take-up machine pinch rolls 14 through the guide plate 13, so that a cylindrical inflation film 15 is formed. Further, the film is sent to a winder (not shown) via a roller 16 and wound by the winder. Note that, after being extruded from the annular die 10, before passing through the take-up machine pinch roll, the bubble 12 is cooled by the cooling air (not shown) emitted from the air outlet 17.
An inflation film molded article can be obtained by cutting the inflation film thus obtained into a desired length. Further, the bottomed tubular shaped article can be obtained by bonding the bottom portion of the inflation film.

The blown film composed of multiple layers can be obtained by coextruding the mixture.

The blown film may be a commercially available film.

Examples of the crosslinking treatment for the blown film molded article include (1) actinic ray irradiation treatment and (2) water crosslinking treatment.

In the present specification, the actinic ray means radiation that chemically acts on the crosslinkable resin material to promote the crosslinking reaction, and specifically, visible rays, ultraviolet rays, X-rays, electron rays, α It means rays, β rays, γ rays, and the like. Among these, electron beams are preferable because they are easy to control, and γ rays are preferable because they have excellent penetrating power.
Here, the dose of electron beams and γ rays is preferably 1 to 1000 kGy, and more preferably 20 to 300 kGy. The acceleration voltage of the electron beam is preferably 50 to 1000 kV, and more preferably 70 to 400 kV.

Examples of the method of water-crosslinking treatment include a method of immersing the molded product in water, and a method of exposing the molded product to a hot and humid atmosphere. When the molded product is immersed in water, the temperature of water is preferably 20° C. or higher and 90° C. or lower, and more preferably 45° C. or higher and 75° C. or lower. When the molded product is exposed to a hot and humid atmosphere, the temperature is preferably 20°C or higher and 120°C or lower, more preferably 45°C or higher and 100°C or lower, and the relative humidity is 50% or higher. Is preferable and 80% or more is more preferable.

Manufacturing Method of Composite Container 10A Next, a manufacturing 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, for example, an injection molding machine (not shown) may be used to manufacture the preform 10a by an injection molding method. Further, as the preform 10a, a preform generally used conventionally may be used.

Next, by providing the plastic member 40a on the outer side of the preform 10a, the composite preform 70 having the preform 10a and the plastic member 40a mounted on the outer side of the preform 10a is manufactured (FIG. 6( See b)).
In the present embodiment, 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 region of the body portion 20a except the portion corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a.

In this way, by attaching the plastic member 40a to the outside of the preform 10a in advance and producing the composite preform 70, a series of steps for producing the composite preform 70 (FIGS. 6A to 6B). )) and a series of steps for manufacturing the composite container 10A by blow molding (FIGS. 6(c) to 6(f)) can be performed at different places (factory or the like).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 6C). 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. 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 die 50c is lowered, the pair of body dies 50a, 50b are closed, and the pair of body dies 50a, 50b and the bottom die 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.

Modified Example Next, a modified example of the first embodiment of the present invention will be described with reference to FIGS. 7, 8 and 9A to 9F.

The modified examples shown in FIGS. 7, 8 and 9A to 9F do not have a bottom as the plastic member 40a, but use a cylindrical plastic member 40a.

In the composite container 10A shown in FIG. 7, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to a lower portion of the body portion 20, but does not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 8, the plastic member 40a is adhered 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. Covers a region excluding a portion 13a corresponding to the above and a portion corresponding to a lower portion of the body portion 20a.

Other configurations in FIGS. 7, 8 and 9A to 9F are substantially the same as those of the embodiment shown in FIGS. 1 to 6. In the modified examples shown in FIGS. 7, 8 and 9A to 9F, the same parts as those of the embodiment shown in FIGS. 1 to 6 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 embodiment shown in FIGS. 1 to 6, and thus detailed description thereof will be omitted.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 10 to 17 are views showing a second embodiment of the present invention. 10 to 17, 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. 10 and 11.

The composite container 10A shown in FIGS. 10 and 11 is a composite preform 70 (see FIG. 13) including the preform 10a, the inner label member 60a, and the plastic member 40a using the 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.

The container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a body portion 20 provided below the shoulder portion 12, and a body portion And 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, so that the plastic member 40 does not move or rotate easily with respect to the container body 10. There is.

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. 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 region 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, 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 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 the neck portion 13, the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10 except the mouth portion 11. 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 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. 13, 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, the configurations and manufacturing methods of the container body 10 and the plastic member 40 are substantially the same as those in the above-described first embodiment, and therefore 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. 12, the composite preform 70 includes a preform 10a made of a plastic material, a bottomed cylindrical inner label member 60a provided on the outer side of the preform 10a, and an outer side of the inner label member 60a. The bottomed cylindrical plastic member 40a.

The inner label member 60a is attached to the outer surface of the preform 10a. 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 the inner label member 60a, a film of polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate resin, polyacetal resin, fluorine resin, or the like 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, 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, the content liquid is prevented from being deteriorated by oxygen, and the content is evaporated by vaporization. Can be prevented from decreasing. As such a material, it is possible to mix PE, PP, MXD-6, EVOH or an oxygen absorbent such as a fatty acid salt with these materials.

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 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. 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.

On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without adhering to it, and is mounted so as not to move or rotate with respect to the preform 10a. 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 region of the body portion 20a except the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a.

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 and the bottom portion 30a except the mouth portion 11a. 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.

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 FIGS. 13(a) and 13(b), the plastic member 40a can be produced by cutting an inflation film molded product into a desired length. In this case, as shown in FIG. 13(a), the plastic member 40a may have a tubular shape (bottomless cylindrical shape) having the body portion 41, and as shown in FIG. 13(b), The bottom portion 42 may be formed into a bottomed tubular shape by fusing, welding, or adhering.

Manufacturing Method of Composite Container 10A Next, a manufacturing 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. 14(a)).

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. Thus, the composite preform 70 having the preform 10a, the inner label member 60a attached to the outer side of the preform 10a, and the plastic member 40a attached to the outer side of the inner label member 60a is manufactured (FIG. 14). (See (b)). In this case, the inner label member 60 a 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.

In this case, the inner label member 60a and the plastic member 40a having an inner diameter that is the same as or slightly smaller than the outer diameter of the preform 10a can be attached to the outer surface of the preform 10a by pushing them into the preform 10a. it can.

Alternatively, 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 attached to the outside of the preform 10a.

In this way, a series of steps for producing the composite preform 70 by attaching the plastic member 40a to the outer sides of the preform 10a and the inner label member 60a in advance and producing the composite preform 70 (see FIG. It is possible to carry out a) to (b)) and a series of steps (FIGS. 14D to 14F) for producing the composite container 10A by blow molding at different places (factory etc.).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 14C).

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 in substantially the same manner as in the case of the first embodiment described above, the container body 10 and the inner label member provided on the outer surface of the container body 10. A composite container 10A including 60 and the plastic member 40 provided outside the inner label member 60 is obtained (see FIGS. 14D to 14F).

In addition, the method for manufacturing the composite container 10A according to the present embodiment is substantially the same as that in the case of the above-described first embodiment, and thus detailed description thereof is omitted here.

Modified Example Next, a modified example of the present invention will be described with reference to FIGS. 15, 16 and 17A to 17F.

In the modified examples shown in FIGS. 15, 16 and 17(a) to 17(f), the inner label member 60a and the plastic member 40a do not have a bottom portion, but a cylindrical inner label member 60a and a plastic member. The member 40a.

In the composite container 10A shown in FIG. 15, the inner label member 60 and the plastic member 40 extend from the shoulder portion 12 of the container body 10 to a lower portion of the body portion 20, but do not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 16, the inner label member 60a and the plastic member 40a are adhered so as to cover only the body portion 20a of the preform 10a. It covers a region of the main body 10 excluding a portion 13a corresponding to the neck portion 13 and a lower portion of the body portion 20a.

Other configurations in FIGS. 15, 16 and 17A to 17F are substantially the same as those of the embodiment shown in FIGS. In the modified examples shown in FIGS. 15, 16 and 17(a) to 17(f), the same parts as those of the embodiment shown in FIGS. 10 to 14 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 embodiment shown in FIGS. 10 to 14, and thus detailed description thereof will be omitted.

Claims (8)

In the composite preform,
A preform made of plastic material,
Provided so as to surround the outside of the preform, a plastic member of an inflation film molded article,
The plastic member includes a crosslinked resin material,
A composite preform, wherein the plastic member is provided in close contact with the preform without being welded to the preform. The composite preform according to claim 1, wherein the crosslinked resin material is a resin material crosslinked by actinic ray irradiation or a silane-crosslinkable polyolefin resin having a siloxane bond (Si-O-Si). The composite preform according to claim 1 or 2, wherein the plastic member contains a crosslinking agent and/or a crosslinking aid. In a composite container,
A container body made of plastic material,
Provided in close contact with the outside of the container body, comprising a plastic member of an inflation film molded article,
The plastic member includes a crosslinked resin material,
A composite container, wherein the plastic member is provided in close contact with the container body without being welded thereto. The composite container according to claim 4, wherein the crosslinked resin material is a resin material crosslinked by irradiation with actinic rays or a silane crosslinkable polyolefin resin that forms a siloxane bond (Si-O-Si). The composite container according to claim 4 or 5, wherein the plastic member contains a crosslinking agent and/or a crosslinking aid. A step of preparing a preform,
A step of preparing a plastic member,
On the outside of the preform, a step of mounting the plastic member is provided, wherein the plastic member is provided in close contact with the preform without being welded ,
The plastic member is
A step of heating and melting a mixture containing a crosslinkable resin material,
A step of extruding the heat-melted mixture by an inflation method,
Cross-linking the cross-linkable resin material in the extruded mixture,
A method for producing a composite preform, characterized in that it is produced by a method comprising The method according to claim 7, wherein the step of crosslinking the crosslinkable resin material is performed by an actinic ray irradiation treatment or a water crosslinking treatment on the extruded mixture.

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