JP6681037B2 - Composite preform, composite container and method of manufacturing the same, and plastic member - Google Patents

Description

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

  Recently, plastic bottles for storing content liquids such as food and drink have become popular, and such plastic bottles store the content liquid.

  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 multilayer material, a blend material, or the like is used to mold the container into a container shape. However, in the conventional biaxial stretch blow molding method, it is common to simply mold the preform into a container shape. For this reason, when giving various functions and characteristics (barrier property, heat insulation property, etc.) to the container, the means for changing the material of the preform is limited, for example. In particular, it is difficult to provide different functions and characteristics depending on the parts of the container (for example, the trunk and 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, and a plastic member. The purpose is to provide.

The composite preform of the present invention is
A preform made of plastic material,
A plastic member provided so as to surround the outside of the preform,
The plastic member is a heat-shrinkable tube containing a resin material cross-linked by actinic rays.

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

The composite container of the present invention is
A container body made of plastic material,
A plastic member on the outer surface of the container body,
The container body and the plastic member are integrally expanded by blow molding,
The plastic member is a heat-shrinkable tube containing a resin material cross-linked by actinic rays.

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

The method for manufacturing the composite container of the present invention is
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 a heat-shrinkable tube containing a resin material cross-linked by actinic rays.

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

  In the aspect of the present invention, the plastic member includes a step of extruding the resin material to obtain a molded article, and a step of irradiating the molded article with actinic rays to crosslink the resin material. It is preferably obtained by

The plastic member of the present invention is mounted so as to surround the outside of the preform, and is heated integrally with the preform, thereby forming the preform and the plastic member adhered to the outside of the preform. A plastic member for producing a composite container having:
At least a tubular body portion that covers the body portion of the preform,
The plastic member is a heat-shrinkable tube containing a resin material cross-linked by actinic rays.

  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. In addition, since the plastic member is a heat-shrinkable tube, after blow molding, less air enters between the container body and the plastic member, and the adhesion is high. Furthermore, since the plastic member contains a resin material crosslinked by actinic rays, the transparency of the plastic member and the scratch resistance and heat resistance of the composite container can be improved. In addition, since the slip agent used during transportation on the production line is an alkaline chemical, an ordinary PET bottle or the like may be decomposed, resulting in a change in color and damage. Since the plastic member included in the composite container and the composite preform according to the present invention has high chemical resistance, such a problem can be solved.

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 sectional view showing the composite container according to the first embodiment of the present invention (a sectional view taken along line II-II in FIG. 1). FIG. 3 is a vertical sectional view showing a composite preform according to the first embodiment of the present invention. FIG. 4 is a perspective view showing a plastic member. 5A to 5F are schematic views showing the blow molding method according to the first embodiment of the present invention. FIGS. 6A to 6F are schematic views showing a blow molding method according to a modification of the first embodiment of the present invention. FIG. 7 is a partial vertical sectional view showing a composite container according to the second embodiment of the present invention. FIG. 8 is a horizontal sectional view showing a composite container according to a second embodiment of the present invention (a sectional view taken along line XIII-XIII in FIG. 7). FIG. 9 is a vertical sectional view showing a composite preform according to a second embodiment of the present invention. FIG. 10 is a perspective view showing an inner label member and a plastic member. 11A to 11F are schematic views showing a blow molding method according to the second embodiment of the present invention. 12A to 12G are schematic views showing a blow molding method according to a modification of the second embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 6 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 the 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 the composite preform 70 (see FIG. 3) including the preform 10a and the plastic member 40a by using the 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 a unit by performing blow molding.

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

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

  On the other hand, the plastic member 40 is closely attached to the outer surface of the container body 10 in a thinly extended state, and is attached to the container body 10 in a state 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. As described above, the container body 10 has the mouth portion 11, the neck portion 13, the shoulder portion 12, the body portion 20, and the bottom portion 30.

  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, unevenness such as a panel or a groove may be formed on the body portion 20.

  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 30 is not particularly limited, and may have a conventionally known bottom shape (for example, a petaloid bottom shape or a round bottom shape).

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

  Such a container body 10 can be manufactured by biaxially 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, a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PC (polycarbonate) may be used. preferable. Further, the various resins described above may be blended and used. The container body 10 may be colored in a color such as red, blue, yellow, green, brown, black, or white, but is preferably colorless and transparent in consideration of ease of recycling. Further, a vapor-deposited 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 properties of the container.

  Further, the container body 10 can be formed as a multilayer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, MXD-6 (nylon), MXD-6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate) is used as the intermediate layer. The resin (intermediate layer) having the gas barrier property and the light shielding property may be formed into a multi-layer bottle having the gas barrier property and the light shielding property by extrusion-molding the preform 10a including three or more layers. 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 a built-in foam cell, the light shielding property of the entire container body 10 can be enhanced.

  Such a container body 10 may be composed of, for example, a bottle having a full volume of 100 ml to 2000 ml. 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 (40a) is provided so as to surround the outside of the preform 10a as described later, and is adhered to the outside of the preform 10a, and then obtained by being biaxially stretch blow-molded together with the preform 10a. To be The plastic member 40a is a heat-shrinkable tube which is made of a resin material cross-linked by actinic rays and has a shrinking action with respect to the preform 10a, which is produced by a process of imparting heat shrinkability. is there. Since the plastic member 40a is the heat-shrinkable tube, it is possible to prevent the deviation from the preform 10a. Further, the followability to blow molding can be improved. Furthermore, since the plastic member 40a contains a resin material cross-linked by actinic rays, the transparency of the plastic member and the scratch resistance of the composite container can be improved. The plastic member 40a may itself be contractible or elastic and can be contracted without any external action.

  The plastic member 40a is provided on the outer side of the preform 10a, is integrally heated with the preform 10a, and is biaxially stretch blow molded. As a result, the plastic member 40 is obtained.

  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 and the body portion 20 of the container body 10 except the mouth portion 11 and the neck portion 13. As a result, desired functions and characteristics can be imparted to the shoulder portion 12 and the body portion 20 of the container body 10.

  Note that the plastic member 40 may be provided in the entire or a part of the container body 10 other than the mouth 11. For example, the plastic member 40 may be provided so as to cover the neck portion 13, the shoulder portion 12, and the body portion 20 of the container body 10 except the mouth portion 11 and the bottom portion 30. Alternatively, the plastic member 40 may be provided so as to cover a part of the bottom portion 30 in addition to this. Further, 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 neck portion 13 and the outer surface of the body portion 20, respectively.

  Further, since the plastic member 40 is not welded or adhered to the container body 10, it can be separated (peeled) from the container body 10 and removed.

  Examples of the method for separating (peeling) the plastic member 40 from the container body 10 include hot water separation. Specifically, since the plastic member 40 (40a) has a heat shrinkability, the composite container 10A including the plastic member 40 and the container body 10 is made into a small piece container body and a small piece plastic piece. By crushing into a plurality of flakes including a member and immersing the plurality of flakes in hot water, the flakes can be separated into a small-piece-shaped container body and a small-piece-shaped plastic member, respectively. Separation of the small-piece-shaped container body and the small-piece-shaped plastic member occurs due to the thermal contraction of the plastic member 40 and the difference in their specific gravities. Further, the separated small-piece-shaped container body and the separated small-piece-shaped plastic member are separately collected.

  As another example of the separating method, for example, the plastic member 40 is cut off by using a knife or the like, or the plastic member 40 is provided with a cutting line in advance, and the plastic member 40 is peeled along the cutting line. be able to. Since the plastic member 40 can be separated and removed from the container body 10 by the method described above, the colorless and transparent container body 10 can be recycled as in the conventional case.

  In one embodiment, a label such as a shrink label or a stretch label can be attached to the plastic member 40 via an adhesive (not shown). Since the label is adhered to the plastic member in this manner, the plastic member can be separated (peeled) from the container body at the same time when the label is removed. The adhesive used in this case is not particularly limited as long as the plastic member is attached to the label and can be separated from the container body, but it is not particularly limited, but a cyanoacrylate-based adhesive, a silicone-based adhesive, an epoxy, etc. System adhesives and the like.

  Further, the thickness of the plastic member 40 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 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.

  Of these, the preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. Of these, the mouth portion 11a corresponds to the mouth portion 11 of the container body 10 described above, and has substantially the same shape as the mouth portion 11. 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 30a corresponds to the bottom 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 adhered thereto, and is adhered to the preform 10a so as not to move or rotate, or to such an extent that it does not drop by its own weight. . The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

  In this case, the plastic member 40a is provided so as to cover the entire body portion 20a except 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 part of the area other than the mouth 11a. For example, the plastic member 40a may be provided so as to cover the entire body portion 20a including the neck portion 13. Alternatively, the plastic member 40a may cover the entire region of the body portion 20a and a partial region of the bottom portion 30a. Further, the number of the plastic member 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 resin material crosslinked by irradiating with actinic rays. The resin material may include a resin such as PE, PP, polystyrene, polyvinylidene fluoride, polymethyl acrylate, polyvinyl chloride, polybutadiene, natural rubber, vinyl alcohol, and polyamide resin as a resin that is crosslinked by irradiation with actinic rays. it can. Among these, PE and PP are preferable. The content of such a resin in the plastic member 40a is preferably 95 to 100% by mass, and more preferably 98 to 100% by mass.

  Further, the resin material is a resin which is not cross-linked by irradiation with actinic rays, for example, polylactic acid, poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinylidene chloride, as long as its characteristics are not impaired. , Polyvinyl acetate, 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 Le, alkyd resins, polyimides, polysulfones, polyphenylene sulfide, polyether sulfone, silicone resin, polyurethane, phenol resins, urea resins, polyethylene oxide, polypropylene oxide, polyacetal, may contain an epoxy resin or the like.

  Further, the resin material may include a copolymer obtained by polymerizing two or more monomer units constituting the above resin. Further, the resin material may include two or more of the above resins. Further, a blend material, a multilayer structure, or a partial multilayer structure thereof 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-phenylenebisoxazoline. Is mentioned.

  The content of the cross-linking agent is preferably 0.1 to 5 parts by mass, more preferably 0.1 to 2 parts by mass, when the total amount of the resin material is 100 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, and more preferably 0.1 to 2 parts by mass, when the total amount of the resin material is 100 parts by mass.

  Further, the plastic member 40a (40) may contain various additives in addition to the 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, weathering agents, antistatic agents, thread friction reducing agents, slip agents, release agents, Examples thereof include an oxidizing agent, an ion exchange agent, and a coloring pigment.

  Further, the plastic member 40a (40) may be made of a resin material containing 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) may be arranged in a concentrated manner in a portion where the strength is desired to be increased, and the strength of that portion can be selectively increased. For example, a plastic member 40 may be provided around the shoulder 12 of the container body 10 to increase the strength of this portion. Examples of such materials include polyolefin resins such as PE and PP and polystyrene resins such as PS.

  Further, the plastic member 40a may be made of a resin material containing 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 improved, 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, in the container body 10, the plastic member 40 may be provided on the entire area of the shoulder portion 12, the neck portion 13 and the body portion 20 and a part of the bottom portion 30 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 may be made of a resin material containing a material having a ray barrier property against ultraviolet rays and the like. In this case, without using a multilayer preform or a preform containing a blend material as the preform 10a, the light barrier property of the composite container 10A can be enhanced, and the deterioration of the content liquid due to ultraviolet rays or the like can be prevented. For example, in the container body 10, a plastic member 40a may be provided on 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 foaming member having a foaming 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.

  In addition, the plastic member 40a may be made of a resin material containing 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). good. 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, Nanotrack 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 constituting the organic hollow particles include a styrene resin such as a crosslinked styrene-acryl resin, a (meth) acryl resin such as an acrylonitrile-acryl resin, a phenol resin, a fluorine resin, a polyamide resin, and a polyimide. Resin, polycarbonate resin, polyether resin and the like. In addition, low pake HP-1055, low pake HP-91, low peek 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.

  The plastic member 40a may be made of a material that is less slippery than the plastic material that forms the container body 10 (preform 10a). In this case, the user can easily grip 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.

  Further, the plastic member 40a may be designed or printed. In this case, it is possible to display an image or a character on the composite container 10A without adding a label or the like to the container body 10 after the 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. Further, the plastic member 40 of the composite container 10A after blow molding may be printed.

  The plastic member 40a (40) may be colored in a color such as red, blue, yellow, green, brown, black, and white, and may be transparent or opaque.

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

  As shown in FIGS. 3 and 4, 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.

  In the composite container 10A shown in FIG. 1, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to a lower portion of the body portion 20. Further, in the composite preform 70 shown in FIG. 3, the plastic member 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 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 the bottom portion 30a of the preform 10a. It may cover a part of. The same applies to the following aspects.

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

  The plastic member 40a can be manufactured by a method including a step of extruding a resin material to obtain a molded product, and a step of irradiating the molded product with an actinic ray to crosslink the resin material.

More specifically,
(1) First, a resin material and optionally a crosslinking agent, a mixture of a crosslinking aid and an additive are melted by heating in an extruder, and the molten mixture is continuously extrusion-molded using a ring die or the like. To do.
(2) The extruded molded product can be irradiated with actinic rays to crosslink the resin material contained in the molded product to obtain the plastic member 40a.
(3) Further, if desired, the obtained plastic member 40a may be expanded in diameter or cooled after or while being heated.
(4) Further, the obtained plastic member 40a may be cut into a desired size.

  In the present specification, the actinic ray means a radiation that chemically acts on a resin material to promote a crosslinking reaction, and specifically, visible rays, ultraviolet rays, X-rays, electron rays, α rays, Means β rays, γ rays, and the like. Of these, electron beams are preferable because they are easy to control. Here, the dose of the electron beam is preferably 1 to 1000 kGy, and more preferably 50 to 400 kGy. The acceleration voltage of the electron beam is preferably 50 to 1000 kV, more preferably 75 to 300 kV.

  In one embodiment, the heating and diameter expansion of the plastic member 40a can be performed, for example, by the following method. First, one end of the unstretched plastic member 40a is welded or adhered to close the end. Next, the plastic member 40a whose one end is closed is placed in a mold whose inner diameter is larger than the outer diameter of the plastic member 40a. Next, the blow device is placed (mounted) on the other end of the plastic member 40a. At this time, it is preferable that the blower is closely attached to the plastic member 40a so that air does not leak from between them. Subsequently, the plastic member 40a, the mold, and the blowing device are sent to the heating furnace in this arrangement and heated to 70 to 150 ° C inside the heating furnace. As the heating furnace, a hot air circulation type heating furnace may be used in order to maintain a uniform temperature inside. Alternatively, the plastic member 40a, the mold, and the blowing device may be heated by passing them through a heated liquid. Next, the plastic member 40a, the mold, and the blowing device are taken out of the heating furnace, and air is blown into the plastic member 40a from the blowing device to press and stretch the inner surface of the plastic member 40a. As a result, the plastic member 40a is expanded and expanded in diameter along the inner surface shape of the mold. The diameter of the plastic member 40a may be increased while heating it in a heating furnace.

  In one embodiment, the plastic member 40a can be cooled by expanding the diameter and then impregnating the plastic member 40a in cold water with air blown from the blower.

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

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

  Next, the plastic member 40a is loosely inserted on the outer side of the preform 10a (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 covers the entire body portion 20a except the portion corresponding to the neck portion 13 of the container body 10.

  Next, the preform 10a and the plastic member 40a are heated by the heating device 51 (see FIG. 5C). As a result, the composite preform 70 having the preform 10a and the plastic member 40a adhered to the outside of the preform 10a can be manufactured. At this time, the preform 10a and the plastic member 40a are evenly 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.

  By heating the plastic member 40a in this manner, the plastic member 40a is thermally contracted and adheres to the outside of the preform 10a (see FIG. 5C).

  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 portion 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 constructed. 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 ° C to 80 ° C, and the bottom die 50c is cooled to 5 ° C 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, 50b and the bottom die 50c are separated from each other, and the composite container 10A is taken out from the blow molding die 50.

Modification of manufacturing method of composite container 10A

  Next, another modification of the blow molding method (method for manufacturing the composite container 10A) according to the present embodiment will be described with reference to FIGS. The modified example shown in FIGS. 6A to 6G is to heat the preform 10a and the plastic member 40a in two stages, and the other configurations are those shown in FIGS. 5A to 5F. Is almost the same as. In FIGS. 6A to 6G, the same parts as those in FIGS. 5A to 5F are designated by the same reference numerals and detailed description thereof will be omitted.

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

  Next, the plastic member 40a is loosely inserted on the outer side of the preform 10a (see FIG. 6B). 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 40 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.

  Next, the preform 10a and the plastic member 40a are heated by the first heating device 55 (see FIG. 6C). At this time, the heating temperature of the preform 10a and the plastic member 40a may be, for example, 50 ° C to 100 ° C.

  By heating the plastic member 40a, the plastic member 40a is heat-shrinked and adheres to the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and the plastic member 40a adhered to the outside of the preform 10a is obtained (see FIG. 6C).

  In this way, a series of steps for producing the composite preform 70 by preliminarily heating and closely adhering the plastic member 40a to the outside of the preform 10a using the first heating device 55 to produce the composite preform 70 Performing the steps (FIGS. 6 (a) to 6 (c)) and the series of steps (FIGS. 6 (d) to 6 (g)) for producing the composite container 10A by blow molding at different places (factory or the like). Will be possible.

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 6D). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the mouth 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 6E). In this case, heating for shrinking the plastic member 40a and heating for blow molding the preform 10a can be performed in the same step.

  The composite preform 70 is molded by using the blow molding die 50, and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the case of FIGS. 5A to 5F described above. The composite container 10A including the contracted tube 40 is obtained (see FIGS. 6E to 6G).

  As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are formed. The container is inflated as a unit to produce a composite container 10A including the container body 10 and the plastic member 40. As a result, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be configured as separate members. Therefore, various functions and characteristics can be freely added to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

  Further, according to the present embodiment, when the composite container 10A is manufactured, a general blow molding device can be used as it is, so that it is necessary to prepare a new molding facility for manufacturing the composite container 10A. Absent. Further, since the plastic member 40a is provided on the outer side of the preform 10a, it is not necessary to prepare new molding equipment for molding the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 7 to 12 are views showing a second embodiment of the present invention. 7 to 12, 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. 7 and 8.

  As will be described later, the composite container 10A shown in FIGS. 7 and 8 is a composite preform 70 (see FIG. 9) including a preform 10a, an inner label member 60a, and a plastic member 40a using a blow molding die 50. By subjecting the composite preform 70 to the preform 10a, the inner label member 60a, and the plastic member 40a, they are integrally expanded by biaxial stretching blow molding.

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

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

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

  Further, the plastic member 40 is a heat-shrinkable tube, and is adhered to the outer surface of the container body 10 and the outer surface of the inner label member 60 in a thinly extended state, and is easily moved or rotated with respect to the container body 10. It is so close that it does not fall off, or so close 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 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 outer side of the preform 10a as described later, and is obtained by integrally biaxially stretch-blow molding the preform 10a and the plastic member 40a. It is a thing.

  The inner label member 60 is attached to the outer surface of the container body 10 without being adhered, and is in close contact with the container body 10 so as not to move or rotate, or in such a degree that it does not drop by its own weight. . The inner label member 60 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. As shown in FIG. 7, the inner label member 60 is provided over the entire area in the circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

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

  The inner label member 60 may be provided in the entire container body 10 except for the mouth portion 11 or in a partial area thereof. For example, the inner label member 60 may be provided so as to cover a part of the neck portion 13, the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10 excluding the mouth portion 11. Alternatively, the inner label member 60 may be provided so as to cover the entire area of the neck portion 13, the entire area of the shoulder portion 12, the entire area of the body portion 20, and a part of the bottom portion 30. 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.

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

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

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

  Besides, the configurations of the container body 10 and the plastic member 40 are substantially the same as those in the case of the above-described first embodiment, and therefore detailed description thereof will be 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. 9, 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 being easily moved or rotated, or is in close contact with the preform 10a so that it does not drop by its own weight. The inner label member 60a is provided over the entire area in the circumferential direction so as to surround the preform 10a and has a substantially circular horizontal cross section.

  The inner label member 60a may be designed or printed in advance. For example, in addition to the design, the product name, etc., character information such as the name of the content liquid, the manufacturer, the 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 label or the like to the container body 10 after the 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 the step of applying a label using a labeler after the container is sealed, so that the manufacturing cost can be suppressed and the yield can be prevented from decreasing.

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

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

  For example, the inner label member 60a may be made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, without using a multi-layer preform or a preform containing a blend material as the preform 10a, the gas barrier property of the composite container 10A is improved, 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. As such a material, it is possible to mix PE, PP, MXD-6, EVOH, PEN, 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 multilayer preform or a preform containing a blend material as the preform 10a, the light barrier property of the composite container 10A can be enhanced, and the deterioration of the content liquid due to ultraviolet rays or the like can be prevented. As such a material, a blended material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered.

  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. The inner label member 60a preferably further contains hollow particles. The average particle diameter of the hollow particles is preferably 1 to 200 μm, more preferably 5 to 80 μm. The hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of a glass or the like. Hollow particles are preferred. As the resin constituting the organic hollow particles, the same resins as those mentioned above can be mentioned. Further, the commercially available hollow particles can also be used. The content of the hollow particles is preferably 0.01 to 50 parts by mass, and more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the resin contained in the inner label member 60a.

  On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without being adhered, and is adhered to the preform 10a so as not to move or rotate, or to such an extent that it does not drop by its own weight. Has been done. The plastic member 40a is provided over the entire area in the circumferential direction so as to surround the preform 10a and has a substantially circular horizontal cross section.

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

  The inner label member 60a and the plastic member 40a may be provided in the whole area or a partial area other than the mouth portion 11a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body portion 20a including the neck portion 13. Further, each of the inner label member 60a and the plastic member 40a is not limited to one, but a plurality of members may be provided. For example, the two inner label members 60a and the plastic member 40a may be provided at two outer positions of the body portion 20a.

  The plastic member 40a has a function of contracting with respect to the preform 10a, and contracts (for example, heat contracts) with respect to the preform 10a when heat is applied.

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

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

  As shown in FIG. 10, it is preferable that the plastic member 40a (inner label member 60a) has a cylindrical body portion 41 (body portion 61) that is entirely in the shape of a bottomless cylinder. In this case, various functions and characteristics can be given to the composite container 10A.

  Next, a blow molding method (method for manufacturing 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. 11 (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 (see FIG. 11B). The inner label member 60a and the plastic member 40a are attached so as to cover the entire body portion 20a except the portion corresponding to the neck portion 13 of the container body 10. At least a part of the plastic member 40a may be semitransparent or transparent.

  In this case, a plastic member 40a may be provided around the inner label member 60a in advance, 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.

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

  By heating the plastic member 40a in this manner, the plastic member 40a is thermally shrunk and adheres to the outside of the preform 10a (see FIG. 11C).

  Subsequently, the preform 10a, the inner label member 60a, and the plastic member 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 11D).

  The preform 10a, the inner label member 60a, and the plastic member 40a are molded using the blow molding die 50, and are substantially the same as the container main body 10 in the same manner as in the case of FIGS. A composite container 10A including an inner label member 60a provided on the outer surface of the container body 10 and a plastic member 40 provided on the outer side of the inner label member 60a is obtained (FIGS. 11D to 11F). reference).

  Next, another modified example of the blow molding method (method for manufacturing the composite container 10A) according to the present embodiment will be described with reference to FIGS. The modified example shown in FIGS. 12 (a) to 12 (g) heats the preform 10a and the plastic member 40a in two stages, and other configurations are the forms shown in FIGS. 11 (a) to 11 (f). Is almost the same as. 12A to 12G, the same parts as those in FIGS. 11A to 11F are denoted by the same reference numerals and detailed description thereof will be omitted.

  First, a preform 10a made of a plastic material is prepared (see FIG. 12 (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 (see FIG. 12B). 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. At least a part of the plastic member 40a may be semitransparent or transparent.

  In this case, a plastic member 40a may be provided around the inner label member 60a in advance, 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.

  Next, the preform 10a, the inner label member 60a, and the plastic member 40a are heated by the first heating device 55 (see FIG. 12 (c)). At this time, the heating temperature of the preform 10a, the inner label member 60a, and the plastic member 40a may be, for example, 50 ° C to 100 ° C.

  By heating the plastic member 40a, the plastic member 40a is heat-shrinked and adheres to the outside of the preform 10a. 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 obtained (FIG. 12). (See (c)).

  In this way, the composite preform 70 is produced by heating and closely adhering the plastic member 40a to the outside of the preform 10a and the inner label member 60a using the first heating device 55 in advance. 12 (a)-(c)) and a series of steps (FIGS. 12 (d)-(g)) for manufacturing the composite container 10A by blow molding are provided at different places (factory etc.). ) Can be carried out.

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 12D). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the mouth 11a facing downward. The heating temperature of the preform 10a, the inner label member 60a, and the plastic member 40a in this heating step may be, for example, 90 ° C to 130 ° C.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 12 (e)).

  The composite preform 70 is molded using this blow molding die 50, and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the case of FIGS. 11A to 11F described above. A composite container 10A including the inner label member 60 and the plastic member 40 provided outside the inner label member 60 is obtained (see FIGS. 12E to 12G).

As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding die 50, the preform 10a of the composite preform 70, the inner label member 60a, and The plastic member 40a is integrally expanded to produce a composite container 10A including the container body 10, the inner label member 60, and the plastic member 40. Therefore, the inner label member 60 can be provided in advance in the composite container 10A at the stage of manufacturing the composite container 10A using the preform 10a. Therefore, it is not necessary to provide a step of applying a label by a labeler after the composite container 10A is filled with the content liquid and tightly stoppered. 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 body 10) and the plastic member 40a (plastic member 40) can be configured as separate members. Therefore, various functions and characteristics can be freely added to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

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

Claims (7)

In the 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 a heat-shrinkable tube containing a resin material cross-linked by actinic rays,
A composite preform, wherein the plastic member is provided in close contact with the preform without being welded thereto .   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 on the outer surface of the container body,
The container body and the plastic member are integrally expanded by blow molding,
The plastic member comprises a resin material cross-linked by actinic rays,
A composite container, wherein the plastic member is a heat-shrinkable tube provided in close contact with the container body without being welded .   The composite container according to claim 3, 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 a heat-shrinkable tube containing a resin material cross-linked by actinic rays,
The method, wherein the plastic member is provided in close contact with the preform without being welded .   The method according to claim 5, wherein the plastic member comprises a crosslinking agent or a crosslinking aid.   The plastic member is obtained by a method including a step of extruding the resin material to obtain a tubular molded article, and a step of irradiating the molded article with actinic rays to crosslink the resin material. Method according to claim 5 or 6, characterized in that

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