JP6724331B2 - Composite preform, composite container, plastic member, and method for manufacturing composite container - Google Patents

Description

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

In recent years, plastic bottles have become common as a container 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 biaxially 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 mold into 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, changing the material forming the preform. In particular, it is difficult to give 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 view of the above points, and is capable of imparting various functions and characteristics to a container, a composite preform, a composite container, a plastic member, and a method for manufacturing the composite container. The purpose is to provide.

The composite preform according to the present invention,
A preform made of plastic material,
With a plastic member provided so as to surround the outside of the preform,
The plastic member is an extruded tube containing a crosslinked resin material.

In the aspect of the present invention, the crosslinked resin material is preferably a resin material crosslinked by irradiation with actinic rays or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

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

The composite container according to the present invention,
A container body made of plastic material,
With a plastic member provided in close contact with the outside of the container body,
The plastic member is an extruded tube containing a crosslinked resin material.

In the aspect of the present invention, the crosslinked resin material is preferably a resin material crosslinked by irradiation with actinic rays or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

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

The plastic member according to the present invention,
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. And
An extruded tube having a tubular body portion that covers at least the body portion of the preform and including a cross-linked resin material.

In the aspect of the present invention, the crosslinked resin material is preferably a resin material crosslinked by irradiation with actinic rays or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

In the embodiment of the present invention, it is preferable that the composition comprises a crosslinking agent and/or a crosslinking aid.

The manufacturing method of the composite container according to the present invention,
A step of preparing a preform made of a plastic material,
A step of providing a plastic member on the outside of the preform,
A step of heating the preform and the plastic member and inserting them into the blow molding die,
By performing blow molding on the preform and the plastic member in the blow molding die, the preform and the plastic member are integrally expanded,
The plastic member is an extruded tube containing a crosslinked resin material.

In an aspect of the invention,
Plastic parts
Heating and melting a mixture comprising a crosslinkable resin material,
A step of continuously extruding the heat-melted mixture into a tube to obtain a molded article,
A step of crosslinking the crosslinkable resin material contained in the molded article,
It is preferably obtained by a method comprising

In the aspect of the present invention, it is preferable that the crosslinkable resin material is crosslinked by an actinic ray irradiation treatment or a water crosslinking treatment on the molded article.

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. Therefore, the preform (container main 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 the composite preform according to the first embodiment of the present invention. FIG. 4 is a perspective view showing a plastic member. FIGS. 5A to 5F are schematic views showing the blow molding method according to the first embodiment of the present invention. FIG. 6 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 7 is a horizontal cross-sectional view (cross-sectional view taken along the line VII-VII of FIG. 6) showing the composite container according to the second embodiment of the present invention. FIG. 8 is a vertical sectional view showing a composite preform according to a second embodiment of the present invention. FIG. 9 is a perspective view showing the inner label member and various plastic members. 10A to 10F are schematic views showing a blow molding method 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 7 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 addition, in this specification, "upper" and "lower" mean the upper side and the lower side in a state (FIG. 1) in which the composite container 10A is upright, respectively.

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 by 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.

Among these, the container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a body portion 20 provided below the shoulder portion 12, and a body 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 of not easily moving or rotating, 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 grounding 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 inner volume of the container body 10 is 500 mL, for example. By reducing the thickness of the container body 10 as described above, the weight of the container body 10 can be reduced.

Such a container body 10 can be manufactured by biaxially stretch blow molding a preform 10a (described later) manufactured by injection molding a synthetic resin material. As the material of the preform 10a, that is, the container body 10, use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PC (polycarbonate). Is preferred. 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 enhance 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, a resin having 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) for the intermediate layer ( A preform 10a having three or more layers as an intermediate layer 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-filled volume of, for example, 10 L to 60 L.

Next, the plastic member 40 will be described. The plastic member 40 is made of an extruded tube, 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 is biaxially stretch blow-molded together with the preform 10a. It was obtained by. Since the plastic member 40 is made of an extruded tube, inexpensive and stable production is possible.

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 so close 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 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 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 functions and characteristics can be given to the shoulder portion 12 and the body portion 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 portion 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 plastic members 40 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 body 20, 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 by using a blade 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, when the plastic member 40 has heat shrinkability, the plastic member 40 can be peeled and removed from the container body 10 by hot water separation. Specifically, the composite container 10A including the plastic member 40 and the container body 10 is crushed into a plurality of flakes including a small-piece-shaped container body and a small-piece-shaped plastic member, and the plurality of flakes are collected. By immersing the flakes in hot water, the flakes can be separated into a small-piece container body and a small-piece plastic member. Separation of the small-piece-shaped container body and the small-piece-shaped plastic member occurs due to the heat shrinkage of the plastic member 40 and the difference in their specific gravities. The separated piece-shaped container body and the separated piece-shaped plastic member are separately collected.

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 structure 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 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 made of an extruded tube and is attached to the outer surface of the preform 10a without being bonded. The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a.

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 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 entire body portion 20a including the neck portion. Alternatively, the plastic member 40a may cover the entire region of the body portion 20a and a partial region of the bottom portion 30a. Furthermore, 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. Further, by blow molding for manufacturing the composite container 10A, heat shrinkability can be 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, a free radical in the presence of an unsaturated silane compound such as vinylmethoxysilane and a free radical generator such as dicumyl peroxide. It can be obtained by heating above the decomposition temperature of the generator.
As the silane crosslinkable resin, a commercially available one may be used. For example, LINKON XLE815N, XCF710N, XCF730N, XHE740N, XHE650N, HM600A, XVF600N, XPM800HM, XPF860G, SS732N, LBC021-2, XCF800N, LBC022-1, PK500N, and L50002N, PK3500N, LY3N, and PK500N, LY500N, LY500N, L3500N, L3500N, L3500N, LY3500Y, N3500Y, N3500Y, N3500Y, N3500Y, N3500Y, N3500Y, N3500Y, N3500Y, N3500N, Y3500N, Y3500N, Y3N5, Y3N5N, Y5N7Y5N, L3K5N, L3K5N, Y3K5N, L3K5N, L3K5N, LK022-1, PK500N, L3K5N, L3K5N, L3K5N, L3C5N, and LKC2700N are all available. To be

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, fluororesin, polymethylmethacrylate, 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. Are listed.

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 is 0.1 to 5 parts by mass. 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, etc. may 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 one that is crosslinked by subjecting it to 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 preferable, 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 within the above numerical range, the crosslinking reaction can be favorably carried out, 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 40a (40) 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 additives include plasticizers, ultraviolet stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, thread friction reducing agents, slip agents, release agents, 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 to prevent the internal volume from decreasing. 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 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, in the container body 10, a plastic member 40a may be provided on the entire area of the shoulder portion 12, neck portion 13, and 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 foam member having a foam cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with 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 heat 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 holds 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 diameter” means a volume average particle diameter, 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, but they are organic based because of excellent dispersibility. Hollow particles are preferred. Examples of the resin forming the organic hollow particles include styrene resins such as crosslinked styrene-acrylic resins, (meth)acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluorine resins, polyamide 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). 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 when the plastic member 40a has a single layer. 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 adding a separate 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 ink, and the resin 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 made 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. ..

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

As shown in FIGS. 3 and 4, the plastic member 40a is preferably a bottomless cylindrical tube 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 12 of the container body 10 to the lower portion of the body 20, but does not reach the bottom 30. Further, in the composite preform 70 shown in FIG. 3, 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. The present invention is not limited to this, and the plastic member 40 may cover a part of the bottom portion of the container body 10. Similarly, the plastic member 40a is one of the bottom portions 30a of the preform 10a. It may cover the part. The same applies to the following aspects.

Next, a method for manufacturing the plastic member 40a 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 continuously extruding the heat-melted mixture into a tube to obtain a molded article,
A step of crosslinking the crosslinkable resin material contained in the molded article,
It is obtained by a method comprising

More specifically, first, the above-mentioned crosslinkable resin material and, if desired, a mixture containing other resin materials, a crosslinking agent, additives and the like are heated and melted, and continuously extruded from a ring die provided in a melt extruder.
Then, the extruded tubular molded article is cooled to obtain a molded article composed of an unstretched extruded tube. The extruded molded product may be cut into a desired size before use.
As the melt extruder, a single-screw extruder, a twin-screw extruder, a vent extruder, a tandem extruder or the like can be used according to the purpose. The heating and melting temperature is preferably 120 to 250°C, more preferably 150 to 220°C, although it varies depending on the resin contained in the mixture.

Examples of the crosslinking treatment for the 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 light, ultraviolet rays, X-rays, electron beams, 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.

In one embodiment, the plastic member 40a before or after the crosslinking treatment may be subjected to a stretching treatment such as a biaxial stretching treatment.

As described above, the plastic member 40a may be formed of a single layer extruded tube, but a multilayer extruded tube may be used when the strength of the body portion 20a of the plastic member 40a and the like is to be increased. It may consist of Multi-layered extruded tubes can be obtained by co-extruding a mixture of two or more different compositions.

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. 5(a)). In this case, the preform 10a may be manufactured by an injection molding method using, for example, an injection molding machine (not shown). Further, as the preform 10a, a preform generally used conventionally may be used.

Next, the plastic member 40a is provided on the outside of the preform 10a, so that the composite preform 70 including the preform 10a and the plastic member 40a is manufactured (see FIG. 5B). In this case, the plastic member 40a has a bottomless cylindrical shape as a whole and has a cylindrical body portion 41. The plastic member 40a is mounted so as to cover the entire body portion 20a except the portion corresponding to the neck portion 13 of the container body 10.

In this case, a 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 pressed into the preform 10a to be brought into close contact with the outer surface of the preform 10a.

In this manner, the plastic member 40a is attached to the outside of the preform 10a in advance, and the composite preform 70 is manufactured in advance, whereby a series of steps for manufacturing the composite preform 70 (FIGS. 5A to 5B). )) and a series of steps for manufacturing the composite container 10A by blow molding (FIGS. 5C to 5F) can be performed at different places (factory or the like).

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

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

The composite container 10A is molded using 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 die 50c which are divided from each other (see FIG. 5D). In FIG. 5D, 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. 5(e), after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the pair of body molds 50a and 50b and the bottom mold 50c are used. A closed blow molding die 50 is configured. Next, air is press-fitted 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 to 80°C, and the bottom die 50c is cooled to 5 to 25°C. At this time, the preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded in the blow molding die 50. 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.

Thus, 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. 5F, 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.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 6 to 10 are views showing a second embodiment of the present invention. 6 to 10, 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 the composite container 10A produced by the blow molding method according to the present embodiment will be described with reference to FIG.

As will be described later, the composite container 10A shown in FIG. 6 has a blow molding die 50 for the composite preform 70 (see FIG. 8) including the preform 10a, the inner label member 60a, and the plastic member 40a. The preform 10a of the composite preform 70, the inner label member 60a, and the plastic member 40a are integrally expanded by performing axial stretch blow molding.

Such a composite container 10A is provided inside a container body 10 made of a plastic material, an inside label member 60 provided in close contact with 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.

Among these, the container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a body portion 20 provided below the shoulder portion 12, and a body 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, or does not drop by its own weight. It is closely attached to the degree.

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. It is attached so that it does not fall under its 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 plastic member 40 may be semitransparent or transparent as a whole, 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. 8, 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 except the mouth portion 11, the neck portion 13 and the bottom portion 30. As a result, desired characters, images, and the like can be added 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 11. For example, the inner label member 60 may be provided so as to cover the entire neck portion 13, the shoulder portion 12, and the body portion 20 of the container body 10, excluding the mouth portion 11 and the bottom portion 30. 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. Furthermore, the number of 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 biaxially stretch blow molded integrally 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 covers the inner label member 60 by being thinly stretched on the outer surface of the inner label member 60. As shown in FIG. 6, 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 addition, the configuration of the container body 10, the configuration of the plastic member 40, the manufacturing method thereof, and the like are substantially the same as in the case of the above-described first embodiment, and thus detailed description thereof is omitted here.

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

As shown in FIG. 8, 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 without easily moving or rotating. 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 adding a separate 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 sealing the container tightly, so that it is possible to suppress the manufacturing cost and prevent the yield from decreasing.

As such an 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, it is possible to enhance the gas barrier property of the composite container 10A and prevent the content liquid from being deteriorated by oxygen or water vapor. As such a material, it is also 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 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. 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.

Further, 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. Furthermore, it is preferable to comprise 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 they are organic based 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 thereto. 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 and the bottom portion 30a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body portion 20a except the mouth portion 11a and the bottom portion 30a. 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 case of the first embodiment described above, and thus 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. 9, the plastic member 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.

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. 10(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. As a result, a composite preform 70 having the preform 10a, the inner label member 60a adhered to the outside of the preform 10a, and the plastic member 40a adhered to the outside of the inner label member 60a is manufactured (FIG. 10). (See (b)). In this case, the inner label member 60a has a bottomless cylindrical shape as a whole and has a cylindrical body portion 61.

In this case, even if 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 are pressed against the preform 10a, the inner label member 60a and the plastic member 40a can be brought into close contact with the outer surface of the preform 10a. good.

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. Alternatively, the inner label member 60a may be provided on the outer side of the preform 10a, and then the plastic member 40a may be provided on the outer side of the inner label member 60a.

In this manner, 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 becomes possible to carry out a) to (b)) and a series of steps (FIGS. 10(c) to (f)) 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. 10C).

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 by using this 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. 10D to 10F).

In addition, the blow molding method (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 therefore detailed description thereof is omitted here.

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. The manufacturing 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 on the composite container 10A. Therefore, it is not necessary to provide a step of applying a label by the labeler after filling the content liquid in the composite container 10A and sealing the container. Thereby, the manufacturing cost for manufacturing the final product can be suppressed.
Further, it is possible to prevent the yield from being lowered when the final product is manufactured due to a problem of the labeler or the like.

Further, according to the present embodiment, the preform 10a (container main 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 manufacturing the composite container 10A, a general blow molding device can be used as it is, so that it is necessary to prepare a new molding facility for manufacturing the composite container 10A. Absent.

Claims (9)

In 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 an extruded tube containing a cross-linked resin material,
A composite preform, wherein the plastic member is provided in close contact with the preform without being welded . The composite preform according to claim 1, wherein 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). The composite preform according to claim 1, wherein the plastic member contains a crosslinking agent and/or a crosslinking aid. In 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 plastic member is an extruded tube containing a cross-linked resin material,
A composite container, wherein the plastic member is provided in close contact with the container body without being welded . The composite container according to claim 4, wherein the crosslinked resin material is a resin material crosslinked by actinic ray irradiation 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. 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 mold;
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 plastic member is an extruded tube containing a cross-linked resin material,
The method, wherein the plastic member is provided in intimate contact with the preform without being welded thereto. The plastic member is
Heating and melting a mixture comprising a crosslinkable resin material,
A step of continuously extruding the heat-melted mixture into a tube shape to obtain a molded article;
A step of crosslinking the crosslinkable resin material contained in the molded article,
The method according to claim 7, which is obtained by a method comprising: The method according to claim 8, wherein the cross-linking of the cross-linkable resin material is performed by an actinic ray irradiation treatment or a water cross-linking treatment on the molded article.

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