JP6748939B2 - BLOW MOLDING DIE, COMPOSITE CONTAINER, AND METHOD FOR PRODUCING COMPOSITE CONTAINER - Google Patents

Description

The present invention relates to a blow molding die, a composite container, and a method for manufacturing the composite container.

In recent years, plastic bottles have become common as a bottle for storing a content liquid such as food and drink, and the content liquid 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 stretching blow molding method, for example, a preform containing a single-layer material such as PET or PP, a multi-layer material, a blend material, or the like is used to form the container shape. However, in the conventional biaxial stretch blow molding method, it is general that 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.

International Publication No. 2014/208746

On the other hand, in order to solve the above problems, the present inventors have proposed a composite container having various functions and characteristics such as gas barrier properties, a composite preform used when a composite container is produced, and these. A manufacturing method is proposed (see Patent Document 1). On the other hand, recently, it is required to manufacture such a composite container with higher quality.

The present invention has been made in view of the above points, and is capable of producing a composite container having various functions and characteristics such as gas barrier properties with high quality, a blow molding die, and a composite container. And it aims at providing the manufacturing method of a composite container.

The present invention relates to a blow molding die used for manufacturing a composite container, the first body die having a first mating surface, and the second mating die closely contacting the first mating surface. A second barrel mold having a surface, the first barrel mold having a first neck-corresponding recess corresponding to a part of a neck of the composite container; The body part mold has a second neck part corresponding recess corresponding to another part of the neck part of the composite container, and the first body part mold and the second body part mold are mutually In a state in which they are in close contact with each other, the first neck-corresponding concave portion and the second neck-corresponding concave portion form a neck accommodating region for accommodating the neck portion of the composite container, and a plane perpendicular to the axis of the composite container. In, the outer peripheral shape of the neck accommodating region has a closed curved shape having a major axis and a minor axis shorter than the major axis, and the major axis is parallel to the first and second mating surfaces. It is a blow molding die characterized by being positioned in the direction.

The present invention is the blow molding die, wherein the closed curved shape is a substantially elliptical shape.

In the present invention, the first barrel mold and the second barrel mold are rotatable with respect to each other about a rotation axis, and the center point of the long axis is more than the short axis. The blow molding die is characterized in that it is located on the side of the rotating shaft.

The present invention is the blow molding die, wherein the major axis is 1.0% to 5.0% longer than the minor axis.

The present invention, in the method for manufacturing a composite container, having a mouth, a body, and a bottom, preparing a preform made of a plastic material, and providing a plastic member outside the preform. A step of expanding the preform and the plastic member as one by performing blow molding on the preform and the plastic member using the blow molding die. Is a method of manufacturing a composite container.

The present invention provides, in a composite container, a container body having a mouth portion, a neck portion, a body portion, and a bottom portion, and a plastic member provided in close contact with the outside of the container body. Is a plane that covers at least the periphery of the neck portion and is perpendicular to the axis of the composite container, and the outer peripheral shape of the plastic member in the neck portion has a major axis and a minor axis shorter than the major axis. A composite container having a closed curved shape.

According to the present invention, it is possible to prevent both the problem that the plastic member laterally protrudes in a burr shape around the neck of the composite container and the problem that the plastic member is displaced from the preform during blow molding. As a result, a composite container having various functions and characteristics such as gas barrier properties can be manufactured with high quality.

FIG. 1 is a partial vertical sectional view showing a composite container according to an embodiment of the present invention. FIG. 2 is a horizontal cross-sectional view (cross-sectional view taken along the line II-II in FIG. 1) showing the composite container according to the embodiment of the present invention. FIG. 3 is a partial vertical sectional view showing a composite preform according to an embodiment of the present invention. 4A to 4D are perspective views showing various plastic members. 5A to 5F are schematic views showing a method for manufacturing a composite container according to an embodiment of the present invention. FIGS. 6A to 6F are schematic views showing a method for manufacturing a composite container according to a modified example of the embodiment of the present invention. 7A to 7G are schematic views showing a method for manufacturing a composite container according to a modification of the embodiment of the present invention. 8A and 8B are vertical cross-sectional views showing a blow molding die according to an embodiment of the present invention (a view corresponding to a cross section taken along the line VIIIA-VIIIA and a line VIIIB-VIIIB shown in FIG. 9, respectively). FIG. 9 is a horizontal cross-sectional view showing a blow molding die according to an embodiment of the present invention. FIG. 10 is a horizontal sectional view showing a blow molding die according to a modification of the embodiment of the present invention.

An embodiment of the present invention will be described below with reference to the drawings. 1 to 10 are views showing an embodiment of the present invention.

(Composition of composite container)
First, an outline of a composite container manufactured by the method for manufacturing a composite container (blow molding method) according to the present embodiment will be described with reference to FIGS. 1 and 2. In addition, in the present specification, “upper” and “lower” refer to an upper side and a lower side in a state where the composite container 10A is upright (FIG. 1 ), 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 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.

Of these, the container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a body portion 20 provided below the shoulder portion 12, and a body 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 where it does not easily move or rotate.

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 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 (meaning 50 μm or more and 250 μm or less; the same applies below). Further, the weight of the container body 10 is not limited to this, but can be 10 g to 20 g when the full volume of the container body 10 is 500 ml, for example. By reducing the thickness of the container body 10 in this manner, the weight of the container body 10 can be reduced.

Such a container body 10 can be manufactured by 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. 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. Moreover, you may blend and use the above-mentioned various resins. 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 property of the container.

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

Further, by mixing an inert gas (nitrogen gas, argon gas) into 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, 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 obtained by being closely attached to the outside of the preform 10a and then biaxially stretch blow-molded together with the preform 10a. It is a thing.

The plastic member 40 is attached to the outer surface of the container body 10 without being adhered, and is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. Further, as shown in FIG. 2, the plastic member 40 is provided over the entire 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 entire 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. As a result, desired functions and characteristics can be imparted to the neck portion 13, the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10. Further, the number of the plastic member 40 is not limited to one, and a plurality of members may be provided. For example, two plastic members 40 may be provided on the outer surface of the neck portion 13 and the shoulder portion 12 and the outer surface of the bottom portion 30, respectively.

In the present embodiment, the plastic member 40 covers at least the neck portion 13 of the container body 10. In this case, the plastic member 40 may cover the entire area of the neck portion 13 or may cover only a partial area of the neck portion 13. The thickness of the container body 10 in the neck portion 13 is, for example, 200 μm to 5000 μm. The outer diameter _{D 3} of the plastic member 40 around the neck portion 13 is, for example, 25Mm～29mm. On the plane F perpendicular to the axis C _L of the composite container 10A, the outer peripheral shape of the plastic member 40 in the neck portion 13 has a closed curved shape having a long axis and a short axis. This curved shape has a shape corresponding to the curved shape C _s of the neck accommodating region 52 of the blow molding die 50 described later.

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 may be cut off using a knife or the like, or a cutting line (not shown) may be provided in advance on the plastic member 40, and the plastic member 40 may be peeled along the cutting line. it can. Thereby, the plastic member 40 can be separated and removed from the container body 10.

Such a plastic member 40 may not have a contracting action with respect to the preform 10a, or may have a contracting action.

The thickness of the plastic member 40 is not limited to this, but may be, for example, about 5 μm to 500 μm around the body portion 20 when it is attached to the container body 10. The thickness of the plastic member 40 is, for example, about 5 μm to 1000 μm around the neck portion 13.

(Composition of composite preform)
Next, the configuration of the composite preform used when producing the composite container 10A described above will be described with reference to FIG.

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

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

The plastic member 40a is attached to the outer surface of the preform 10a without being adhered, and is in close contact with the preform 10a so as not to move or rotate, or in such a degree 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 region of the body portion 20a including the portion (neck-corresponding portion) 13a corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a. The neck corresponding portion 13a has a substantially cylindrical shape having a substantially uniform diameter.

The plastic member 40a may be provided in the whole area or a partial area other than the mouth portion 11a. In the present embodiment, the plastic member 40a covers at least the neck-corresponding portion 13a of the preform 10a. In this case, the plastic member 40a may cover the entire area of the neck-corresponding portion 13a or may cover only a part of the neck-corresponding portion 13a. Incidentally, neck outer diameter _{D 2} of the plastic member 40a in the corresponding portion 13a is, e.g., 25Mm～29mm. The thickness of the plastic member 40a in the neck-corresponding portion 13a may be, for example, about 5 μm to 1000 μm. Further, the number of plastic members 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.

Such a plastic member 40a may or may not have a contracting action on the preform 10a.

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

In the latter case, that is, in the case where the plastic member (outer contraction member) 40a has a contracting action, the plastic member (outer contraction member) 40a may be pressed when an external action (for example, heat) is applied. A material that contracts (for example, heat contracts) with respect to the reform 10a may be used. Alternatively, the plastic member (outer contraction member) 40a may itself be contractible or elastic, and capable of contracting without any external action.

Examples of the plastic member 40a include polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, Polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluororesin, polymethylmethacrylate, polyacrylic acid, polymethylacrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, Ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6, nylon 6,6, nylon MXD6, aromatic polyamide, polycarbonate, polyterephthalate ethylene, 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, polyether sulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide , Polypropylene oxide, polyacetal, epoxy resin and the like. Of these, it is preferable to use thermoplastic non-elastic resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Further, a blended material thereof, a multi-layer structure, or a partially multi-layer structure may be used. Further, various additives other than the resin as the main component may be added to the material of the plastic member 40a as long as the characteristics 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, and 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. The light-shielding property can be improved.

The plastic member 40a may be made of the same material as the container body 10 (preform 10a). In this case, in the composite container 10A, for example, the plastic member 40 can be placed in a concentrated manner in a portion where the strength is desired to be increased, and the strength at that portion can be selectively increased. For example, a plastic member 40 may be provided around the shoulder 12 and the bottom 30 of the container body 10 to increase the strength of this portion. Examples of such materials include thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate).

The plastic member 40a 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. For example, in the container body 10, a plastic member 40 may be provided over the entire area of the shoulder 12, neck 13, body 20, and bottom 30 to enhance the gas barrier property of this portion. Examples of such materials include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), or oxygen such as fatty acid salt in these materials. It is also possible to mix an absorbent material.

Further, the plastic member 40a may be made of a material having a barrier property against light rays such as ultraviolet rays. 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 over the entire area of the shoulder 12, neck 13, body 20, and bottom 30 to enhance the ultraviolet barrier properties of this portion. 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. Moreover, you may use the foaming member which has the foaming cell diameter of 0.5-100 micrometers produced by mixing the inert gas (nitrogen gas, argon gas) with the melted material of thermoplastic resin.

In addition, the plastic member 40a may be made of a material having a higher heat insulation property (lower thermal conductivity) than the plastic material forming the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transferred to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. Thereby, the cold insulation property or the heat insulation property of the composite container 10A is enhanced. For example, a plastic member 40 may be provided on all or part of the body 20 of the container body 10 to enhance the cold insulation or heat retention of the body 20. Further, when the user grips the composite container 10A, it is prevented that the composite container 10A becomes difficult to hold due to being too cold or too hot. As such a material, foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. Hollow particles are preferably mixed with a resin material containing these resins. The average particle diameter of the hollow particles is preferably 1 to 200 μm, more preferably 5 to 80 μm. The "average particle size" means a volume average particle size, and is measured by a known method using a particle size distribution/particle size distribution measuring device (for example, Nanotrac particle size distribution measuring device, manufactured by Nikkiso Co., Ltd.). can do. The hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of a glass or the like, but the organic particles are excellent in terms of dispersibility. Hollow particles are preferred. Examples of the resin that constitutes the organic hollow particles include styrene resins such as crosslinked styrene-acrylic resins, (meth)acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluororesins, 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, and more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the resin material contained in the plastic member 40a.

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 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.

The plastic member 40a may be designed or printed in advance. In this case, printing may be performed by designing or printing on the plain plastic member 40a by a printing method such as an inkjet method or a gravure printing method. 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 40a may be colored in colors 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(a), the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. May be. In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, in addition to the body portion 20 of the composite container 10A, various functions and characteristics such as barrier property should be given to the bottom portion 30 as well. You can Examples of such a plastic member 40a include the blow tube and the sheet molding tube described above.

In addition, as shown in FIG. 4B, the plastic member 40a may have a cylindrical shape (cylindrical shape without a bottom) as a whole, and may have a cylindrical body portion 41. In this case, as the plastic member 40a, for example, the blow tube, the extrusion tube, the inflation molding tube, or the sheet molding tube described above can be used.

Further, as shown in FIGS. 4C and 4D, the plastic member 40a may be manufactured by forming a film into a tubular shape and bonding the ends thereof. In this case, as shown in FIG. 4(c), the plastic member 40a may have a tubular shape (bottomless cylindrical shape) having the body portion 41, and as shown in FIG. 4(d), The bottom portion 42 may be bonded to form a bottomed tubular shape.

(Method of manufacturing composite container)
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). Further, as the preform 10a, a preform generally used conventionally may be used.

Next, the plastic member 40a is prepared. In this case, the plastic member 40 a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41.

Next, by providing the plastic member 40a on the outer side of the preform 10a, the composite preform 70 having the preform 10a and the plastic member 40a that is adhered to the outer side of the preform 10a is manufactured (Fig. 5 ( See b)). At this time, the plastic member 40a covers the body portion 20a including the neck corresponding portion 13a and the bottom portion 30a of the preform 10a.

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 may be pressed into the preform 10a so as to be in close contact with the outer surface of the preform 10a.

In this way, the plastic preform 10a is adhered to the outside of the preform 10a in advance, and the composite preform 70 is manufactured in advance. )) and a series of steps for manufacturing the composite container 10A by blow molding (FIGS. 5(c) to 5(f)) can be performed at different places (factory or the like).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 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. The blow molding die 50 includes a pair of body portion dies 50a and 50b (first body portion die 50a, second body portion die 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 die 50c is lowered, the pair of body dies 50a and 50b are closed and sealed by the pair of body dies 50a and 50b and the bottom die 50c. The blow molding die 50 is formed.

Next, air is pressed into the preform 10a, and the composite preform 70 is biaxially stretch blow molded.

As a result, the container body 10 is obtained from the preform 10a in the blow molding die 50. During this time, the body dies 50a and 50b are heated to 30 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.

Next, as shown in FIG. 5F, the pair of body 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.

(Modified Example of Manufacturing Method of Composite Container)
Next, a modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. In the modified example shown in FIGS. 6A to 6G, the plastic member (outer contraction member) 40a has a function of contracting with respect to the preform 10a, and the other configuration is as shown in FIG. It is substantially the same as the form shown in (f) to (f). In FIGS. 6A to 6F, the same parts as those in FIGS. 5A to 5F 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. 6(a)).

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

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

By heating the plastic member (outer contraction member) 40a in this manner, the plastic member (outer contraction member) 40a is thermally contracted and adheres to the outside of the preform 10a (see FIG. 6C). .. At this time, the plastic member 40a covers the body portion 20a including the neck corresponding portion 13a and the bottom portion 30a of the preform 10a. In addition, when the plastic member (outer contraction member) 40a itself has contractibility, the plastic member at the time when the plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 6B). The (outer shrink member) 40a may be in close contact with the outside of the preform 10a.

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

The preform 10a and the plastic member (outer contraction member) 40a are molded by using this blow molding die 50, and the container main body 10 and the container body 10 are formed in substantially the same manner as in the case of FIGS. A composite container 10A including a plastic member (outer contraction member) 40 provided on the outer surface of the container body 10 is obtained (see FIGS. 6D to 6F).

Next, another modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. In the modified example shown in FIGS. 7A to 7G, the plastic member (outer contraction member) 40a has a function of contracting with respect to the preform 10a, and the preform 10a and the plastic member (outer contraction member) 40a. Is heated in two stages, and other configurations are substantially the same as those shown in FIGS. 5(a) to 5(f) and 6(a) to 6(f). 7A to 7G, the same parts as those in FIGS. 5A to 5F and 6A to 6F are designated by the same reference numerals and detailed description thereof will be omitted.

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

Next, a plastic member (outer shrink member) 40a is provided on the outside of the preform 10a (see FIG. 7B).

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

By heating the plastic member (outer contraction member) 40a, the plastic member (outer contraction member) 40a is thermally contracted and adheres to the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and the plastic member (outer contraction member) 40a that is in close contact with the outside of the preform 10a is obtained (see FIG. 7C). At this time, the plastic member 40a covers the body portion 20a including the neck corresponding portion 13a and the bottom portion 30a of the preform 10a.

In this way, the composite preform 70 is prepared by heating and closely adhering the plastic member (outer shrink member) 40a to the outside of the preform 10a using the first heating device 55 in advance. 7 (a) to (c)) and a series of steps (FIGS. 7 (d) to (g)) for making 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. 7D). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member (outer shrink member) 40a in this heating step may be, for example, 90°C to 130°C.

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

The composite preform 70 is molded using 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. 5A to 5F described above. The composite container 10A including the plastic member (outer contracting member) 40 is obtained (see FIGS. 7E to 7G).

(Structure of blow molding die)
Next, referring to FIGS. 8 and 9, the blow molding process described above (see FIGS. 5D to 5F, 6D to 6F, and 7E to 7G). In, the configuration of the blow molding die used when the composite container 10A is manufactured by the blow molding method will be described in detail. 8 and 9 are views showing the blow molding die according to the present embodiment. Of these, FIGS. 8A and 8B are vertical cross-sectional views of the blow molding mold 50 when the pair of body molds 50a and 50b are in close contact with each other, and are planes including the axis C _L of the composite container 10A. FIG. Figure 9 is a pair of barrel die 50a, when 50b are in close contact, a horizontal sectional view of the blow mold 50, a horizontal sectional view taken along a plane perpendicular to the axis C _L direction of the composite container 10A Is.

In the present embodiment, as described above, the blow molding die 50 includes the pair of body portion dies 50a and 50b (the first body portion die 50a and the second body portion die 50b) and the bottom portion die. A mold 50c (see FIGS. 5D to 5F, 6D to 6F, and 7E to 7G) is provided.

Of these, the first body part mold 50a has a first mating surface 50d which is a substantially flat surface, and a first neck-corresponding recess 52a formed in the first mating surface 50d. The first neck-corresponding concave portion 52a corresponds to a part (in this case, a half in the circumferential direction) of the neck 13 of the composite container 10A.

The second body part mold 50b has a second mating surface 50e which is a substantially flat surface, and a second neck-corresponding recess 52b formed in the second mating surface 50e. The second mating surface 50e comes into close contact with the first mating surface 50d when the pair of body molds 50a and 50b and the bottom mold 50c come into close contact with each other. The second neck-corresponding concave portion 52b corresponds to another part (in this case, half in the circumferential direction) of the neck 13 of the composite container 10A.

As shown in FIG. 8A, the neck accommodating region 52 is formed by the first neck-corresponding recess 52a and the second neck-corresponding recess 52b in a state where the pair of body molds 50a and 50b are in close contact with each other. It The neck 13 of the composite container 10A (the neck-corresponding portion 13a of the preform 10a) is housed in the neck housing area 52. A cavity for accommodating the neck 13 (neck corresponding portion 13a) is formed in the neck accommodating region 52 along the axis C _L direction of the composite container 10A (preform 10a).

As shown in FIG. 9, the outer peripheral shape of the neck accommodating region 52 has a closed curved shape C _s having _a major axis L _a and a minor axis L _i shorter than the major axis L _a . The long axis L _a and the short axis L _{i of the} closed curved shape C _s are orthogonal to each other on the axis C _L of the composite container 10A. In this case, the major axis L _a is located in a direction parallel to the first mating surface 50d and the second mating surface 50e. On the other hand, the minor axis L _i is located in the direction orthogonal to the first mating surface 50d and the second mating surface 50e.

In the present embodiment, the closed curved line shape C _s has a substantially elliptical shape. Here, the substantially elliptical shape includes not only a strict elliptical shape, but also a shape in which a plurality of minute arcs are continuously connected to each other to approximate an elliptical shape.

As shown in FIG. 8 (a), when viewed along the longitudinal axis _{L a} direction torso mold 50a, in a state in which 50b is closed, the neck receiving area 52 of the blow mold 50, the preform 10a Does not come into contact with the plastic member 40a. That is, the length D _a of the major axis L _a of the closed curved shape C _s that constitutes the neck accommodating region 52 is longer than the outer diameter D ₂ of the plastic member 40a in the neck corresponding portion 13a of the preform 10a (D _a >D ₂ ). Accordingly, when the body part mold 50a, 50b are closed, the major axis _{L a} direction (first mating surface 50d and a direction parallel to the second mating surface 50e), the neck receiving area 52, the neck corresponds It is arranged at a slight distance from the plastic member 40a around the portion 13a. Therefore, the plastic member 40a is not sandwiched between the first mating surface 50d and the second mating surface 50e at the position of the neck accommodation area 52. This prevents the plastic member 40a from being blow-molded while being sandwiched between the first mating surface 50d and the second mating surface 50e. As a result, it is possible to prevent the plastic member 40 sandwiched by the first mating surface 50d and the second mating surface 50e from protruding laterally in a burr shape after blow molding.

Specifically, the length _{D a} of the major axis _{L a} may be, for example, as 25Mm～29mm. The length _{D a} closed major axis _{L a} is preferably also for example 0.5mm~2mm only longer than plastic member 40a outer diameter _{D 2} of the neck corresponding portion 13a. The length _{D a} of the major axis _{L a} is, the longer 0.5mm or more than a plastic member 40a outer diameter _{D 2} of _(D a -D ₂ ≧ 0.5mm), the first mating surface 50d second It is possible to more reliably prevent the problem that the plastic member 40a is sandwiched by the mating surface 50e. On the other hand, the length _{D a} of the major axis _{L a} is, _(D a -D ₂ ≦ 2mm) by longer by 2mm or less than the outer diameter _{D 2} of the plastic member 40a, failure of neck 13 is too thick after blow molding Can be prevented. After the blow molding, the neck-corresponding portion 13a of the preform 10a and the plastic member 40a around the neck-corresponding portion 13a are shaped along the inner shape of the neck accommodating region 52. Therefore, in the plane perpendicular to the axis C _L , the outer peripheral shape of the plastic member 40 in the neck 13 of the composite container 10A has a closed curved shape having a long axis and a short axis. This curved shape corresponds to the curved shape C _s of the neck accommodation area 52.

On the other hand, as shown in FIG. 8B, when viewed along the direction of the short axis L _i , the neck accommodating region 52 of the blow molding die 50 is closed when the body dies 50a and 50b are closed. It may or may not come into contact with the plastic member 40a of the reform 10a. When the neck accommodating region 52 contacts the plastic member 40a in the direction of the short axis L _i , the plastic member 40a around the neck corresponding portion 13a corresponds to the first neck portion when the body molds 50a and 50b are closed. It is sandwiched and held by the recess 52a and the second neck-corresponding recess 52b. For this reason, it is possible to prevent the plastic member 40a from being displaced from the preform 10a due to the pressure during blow molding. As a result, there is no possibility that the plastic member 40a will be blow-molded while being displaced from the preform 10a, and it is possible to prevent the defect that the plastic member 40 after blow-molding is in an abnormal position. On the other hand, even when the neck housing area 52 does not contact the plastic member 40a in the direction of the short axis L _i , the plastic member 40a hits the neck housing area 52 immediately after the preform 10a starts to expand during blow molding. Therefore, during blow molding, the plastic member 40a around the neck-corresponding portion 13a expands in the radial direction and is held in close contact with the first neck-corresponding recess 52a and the second neck-corresponding recess 52b. Therefore, even when D _i is slightly longer than D _2, it is possible to prevent the plastic member 40a from being displaced from the preform 10a.

Specifically, the length D _i of the short axis L _i of the curved shape C _s may be, for example, 25 mm to 28 mm. The length _{D a} of the major axis _{L a} may be extended by also, for example, 1.0% to 5.0% than the length _{D i} of the short axis _{L i.} And the length D _a length D _i and the major axis L _a of the short axis L _i by setting the above range, the problem of plastic member 40 projects into burr-like around the neck portion 13 of the composite container 10A In addition to the prevention, the effect of the present embodiment that the plastic member 40a is prevented from being displaced from the preform 10a during blow molding can be reliably obtained.

In addition, as an example, the diameter of the preform 10a in the neck corresponding portion 13a is 25.5 mm, the outer diameter D ₂ of the plastic member 40a is 26.1 mm, and the length of the short axis L _i is 26.16 mm. Yes, the length L _a of the major axis is 26.60 mm.

As described above, according to the present embodiment, in the plane perpendicular to the axis C _L direction of the composite container 10A, the outer peripheral shape of the neck accommodation region 52 has the long axis L _a and the short axis L _i . It has a closed curved shape C _s , and the major axis L _a is located in a direction parallel to the first and second mating surfaces 50d, 50e. Therefore, the major axis L _a direction, projecting the first and second mating surfaces 50d, will be sandwiched plastic member 40a by 50e, lateral this part burr shape after blowing during blow molding It is possible to prevent the malfunction. On the other hand, in the direction of the short axis L _i , the plastic member 40a is clamped by the first and second neck corresponding recesses 52a and 52b during blow molding. As a result, it is possible to prevent the problem that the plastic member 40a is blow-molded in a state of being displaced from the preform 10a. As a result, the composite container 10A having various functions and characteristics such as gas barrier properties can be manufactured with high quality.

In particular, according to the present embodiment, since the neck portion 13 is covered with the plastic member 40, the plastic member 40 around the neck portion 13 protrudes in a burr shape while maintaining functions such as gas barrier properties for the neck portion 13. It is possible to prevent the malfunction. Further, it is possible to prevent the problem that the neck portion 13 is exposed due to the displacement of the plastic member 40 and the functions such as the gas barrier property for the neck portion 13 are lost.

Furthermore, 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 new molding equipment for manufacturing the composite container 10A. Absent. Further, since the plastic member 40a is provided on the outside of the preform 10a, it is not necessary to prepare a new molding facility for molding the preform 10a.

(Modification of blow molding die)
Next, a modified example of the blow molding die according to the present embodiment will be described with reference to FIG. In the modification shown in FIG. 10, the closed curved shape C _s forming the neck accommodating region 52 is different from the shape shown in FIG. 9, and the other configurations are substantially the same as those of the above-described embodiment. .. 10, the same parts as those in the embodiment shown in FIGS. 1 to 9 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the blow molding die 50 shown in FIG. 10, the first barrel die 50a and the second barrel die 50b are centered on _a rotation axis R _a parallel to the axis C _L of the composite container 10A. They are rotatable with respect to each other. That is, a first body part mold 50a and the second body part mold 50b, and has a mutually openable and closable manner hinged about an axis of rotation R _a.

In FIG. 10, the closed curve shape C _s has a non-elliptical shape having _a major axis L _a and a minor axis L _i . The long axis L _a has a pair of ends E ₁ and E ₂ , and the short axis L _i has a pair of ends E ₃ and E ₄ . Further, the center point P of the long axis L _a (a point equidistant from the pair of ends E ₁ and E ₂ ) is located closer to the rotation axis R _a than the short axis L _i and the axis C _L.

In this case, (i) a distance D _b between _one end (the side farther from the rotation axis R _a ) of the major axis L _a and the axis C _L, and (ii) one end E of the minor axis L _{i. 3} is the same as the distance D _c between the axis C _L and (iii) the distance D _d between the other end E _{4 of the} short axis L _i and the axis C _L (D _b =D _c =D). _d ). In contrast, the distance _{D e} between the end portion _{E 2} and the axis _{C L} of (iv) long axis _{L a} of the other (side close to the rotation axis _{R a),} the distance _{D b,} D c, from _{D d} Is also long (D _b =D _c =D _d <D _e ). Further, the closed curved shape C _s includes (i) a first arc A ₁ extending between the ends E ₁ and E ₃ , and (ii) a second arc A ₂ extending between the ends E ₁ and E _4. And (iii) a first elliptic arc A ₃ extending between the ends E ₂ and E ₃ , and (iv) a second elliptic arc A ₄ extending between the ends E ₂ and E ₄ .

Not limited to the above, the distance D _b between the end portion E _{1 on one} side of the long axis L _a (the side farther from the rotation axis R _a ) and the axis line C _L is the end of one (or the other side) of the short axis L _i. The distance D _c (or D _d ) between the portion E ₃ (or E ₄ ) and the axis line C _L may be different.

In FIG. 10, the other end E ₂ (the side closer to the rotation axis R _a ) of the major axis L _a is arranged farther from the axis C _L of the composite container 10A than the other ends E ₁ , E ₃ , E _4. doing. In general, in the neck accommodating region 52, the vicinity of the end E ₂ close to the rotation axis Ra is _a portion where the plastic member 40a is easily pinched. In Therefore end E _2, by separating the plastic member 40a and a neck receiving area 52, it is possible to reliably prevent the problem that plastic member 40 projects into the burr shape. On the other hand, the plastic member 40a can be clamped at the end portions E ₁ , E ₃ , and E ₄ in the neck housing region 52 where the plastic member 40a is relatively difficult to be clamped. This can prevent the plastic member 40a from being displaced from the preform 10a.

10 Container Main Body 10A Composite Container 10a Preform 11, 11a Mouth Part 12 Shoulder Part 13 Neck Part 13a Neck Corresponding Part 14 Screw Part 17 Flange Part 20, 20a Body 30, 30a Bottom 40, 40a Plastic Member 41 Body 42 Bottom 50 Blow molding die 50a First body portion die 50b Second body portion die 50c Bottom die 50d First mating surface 50e Second mating surface 52 Neck accommodating area 52a First neck corresponding recess 52b Second Recesses corresponding to the neck 70 Composite preform

Claims (4)

A mouth portion having a flange portion, a neck portion provided below the flange portion of the mouth portion, a shoulder portion provided below the neck portion, and a body portion provided below the shoulder portion, A blow molding die used in manufacturing a composite container having a bottom portion provided below the body portion ,
A first barrel mold having a first mating surface;
A second barrel mold having a second mating surface that is in close contact with the first mating surface,
It said first body part mold has a first neck portion corresponding recess is concave in a cross section perpendicular to the axis of the composite container with corresponding to a portion of the neck of the composite container,
The second body portion mold has a second neck-corresponding concave portion corresponding to another part of the neck portion of the composite container and having a concave shape in a cross section perpendicular to the axis of the composite container. ,
With the first body part mold and the second body part mold in close contact with each other, the neck part of the composite container is fixed by the first neck part corresponding concave part and the second neck part corresponding concave part. A neck accommodating area for accommodating is formed,
In the cross-sectional plane perpendicular to the axis of the composite container, the outer peripheral shape of the neck portion accommodating region has a maximum diameter, said having a closed curve shape and a shorter shortest diameter than the largest diameter, the longest diameter , Located in a direction parallel to the first and second mating surfaces ,
The first body part mold and the second body part mold can be opened and closed in a hinge shape about a rotation axis parallel to the axis of the composite container, and the center of the longest diameter can be used. The point is located closer to the rotary shaft than the shortest diameter is, the blow molding die. The longest diameter claim 1 Symbol placement blow molding mold, characterized in that long by 1.0% to 5.0% than the shortest diameter. In the method of manufacturing a composite container,
A step of preparing a preform made of a plastic material, which has a mouth portion, a body portion, and a bottom portion,
Providing a plastic member on the outside of the preform,
To the preform and the plastic member, by performing blow molding with a blow mold according to claim 1 or 2, further comprising the step of inflating integrally the preform and the plastic member What is claimed is: 1. A method for manufacturing a composite container. In a composite container,
A mouth portion having a flange portion, a neck portion provided below the flange portion of the mouth portion, a shoulder portion provided below the neck portion, and a body portion provided below the shoulder portion , A container body having a bottom portion provided below the body portion ,
A plastic member provided in close contact with the outside of the container body,
The plastic member covers at least the periphery of the neck portion,
In a plane perpendicular to the axis of the composite container, the outer peripheral shape of the plastic member in the neck, Chi also a maximum diameter, a closed curved shape and a shorter shortest diameter than the largest diameter,
The composite container , wherein the center point of the longest diameter is located closer to one end of the longest diameter than the shortest diameter .

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