JP2020045170A - Composite container, manufacturing method of composite container and manufacturing device for composite container - Google Patents

Abstract

To provide a composite container, a manufacturing method of the composite container and a manufacturing device for the composite container which can increase the separability of a plastic member provided on the outer side of a container body.SOLUTION: A manufacturing method of a composite container 10A includes: a process of preparing a preform 10a; a process of providing a plastic member 40a on the outer side of the preform 10a; a process of manufacturing a container body 10 and a plastic member 40 provided so as to be in close contact with the outer side of the container body 10 by performing the blow molding to the preform 10a and the plastic member 40a; and a process of forming a cut part 45 penetrating the plastic member 40 with respect to the plastic member 40 after the blow molding. The cut part 45 is formed by rotating a cutting member 87 or the container body 10 while pressing the cutting member 87 against the plastic member 40.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a composite container manufacturing method, a composite container manufacturing apparatus, and a composite container.

  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).

  On the other hand, the present applicant has proposed a composite container capable of imparting various functions and characteristics to the container in Patent Document 1.

JP-A-2005-128858

  Since the plastic member provided in the composite container is not welded or bonded to the container body, it can be separated (peeled) and removed from the container body, and the container body can be recycled. However, the plastic member is provided in close contact with the container body, and there is room for improvement in the separability from the container body.

  The present disclosure has been made in view of such a point, and can enhance the separability of a plastic member provided outside a container body, a method for manufacturing a composite container, a manufacturing apparatus for a composite container, and It is intended to provide a composite container.

  A method for manufacturing a composite container according to one embodiment includes a step of preparing a preform, a step of providing a plastic member outside the preform, and a blow molding die for the preform and the plastic member. By performing blow molding using, the preform and the plastic member are expanded integrally, a container body corresponding to the preform, and a plastic member provided in close contact with the outside of the container body. And the step of forming a cut portion penetrating the plastic member, for the plastic member after blow molding, in the step of forming the cut portion, the cut portion, The cutting member or the container body is pressed while pressing the cutting member against the plastic member. It is formed by rotating.

  In the method for manufacturing a composite container according to one embodiment, in the step of forming the cut portion, the cut portion is located at a position corresponding to at least one of a neck portion and a bottom portion of the container body among the plastic members. It may be formed.

  In the method for manufacturing a composite container according to one embodiment, in the step of forming the cut portions, a plurality of the cut portions may be formed.

  In the method for manufacturing a composite container according to one embodiment, in the step of forming the cut portions, the plurality of cut portions may be formed by a plurality of the cutting members.

  The method for manufacturing a composite container according to one embodiment may further include a step of heating the plastic member around the cutout to shrink the plastic member around the cutout.

  In the method for manufacturing a composite container according to one embodiment, the cut portion may have an arc shape.

  In the method for manufacturing a composite container according to one embodiment, in the step of producing a container body corresponding to the preform and a plastic member provided in close contact with the outside of the container body, the bottom of the container body An annular first protrusion may be formed, and in the step of forming the notch, the notch may be formed at a position adjacent to the first protrusion.

  In the method for manufacturing a composite container according to one embodiment, in the step of producing a container body corresponding to the preform and a plastic member provided in close contact with the outside of the container body, A second protrusion protruding radially outward may be formed, and in the step of forming the notch, the notch may be formed at a position adjacent to the second protrusion.

  A composite container manufacturing apparatus according to one embodiment is a composite container manufacturing apparatus for manufacturing a composite container including a container body and a plastic member provided in close contact with the outside of the container body. , A base part, a driving part arranged on the base part, and a processing part attached to the driving part and forming a cut part penetrating the plastic member with respect to the plastic member. The processing portion is provided so as to be movable in a predetermined direction, and is provided rotatably with respect to a first rotation axis extending along the predetermined direction.

  In the apparatus for manufacturing a composite container according to one embodiment, the processing section may include a cutting member.

  In the apparatus for manufacturing a composite container according to one embodiment, the cutting member has a circular shape, and is provided rotatably with respect to a second rotation axis orthogonal to the first rotation axis. When forming the cutting member, the cutting member itself may rotate with respect to the second rotation axis.

  The apparatus for manufacturing a composite container according to one embodiment may further include a support portion that supports the container main body.

  The apparatus for manufacturing a composite container according to one embodiment may further include a rotation restricting unit that restricts rotation of the container main body.

  The composite container according to one embodiment includes a container main body having a mouth, a neck, a body, and a bottom, and a plastic member provided in close contact with the outside of the container main body. A cut portion penetrating the plastic member is formed at a position corresponding to at least one of the neck and the bottom of the container body.

  In the composite container according to one embodiment, a plurality of the cut portions may be formed.

  In one embodiment of the present invention, the cut portion may have an arc shape.

  In the composite container according to one embodiment, an annular first protrusion may be formed on the bottom portion, and the cut portion may be formed at a position adjacent to the first protrusion.

  In the composite container according to one embodiment, a second protrusion protruding radially outward may be formed on the neck, and the cutout may be formed at a position adjacent to the second protrusion.

  ADVANTAGE OF THE INVENTION According to this indication, the separability of the plastic member provided outside the container main body can be improved.

FIG. 1 is a partial vertical sectional view showing a composite container according to an embodiment. FIG. 2 is a horizontal cross-sectional view (a cross-sectional view taken along the line II-II in FIG. 1) illustrating the composite container according to the embodiment. FIG. 3 is a bottom view showing the composite container according to one embodiment. FIG. 4 is a partial vertical sectional view showing a composite preform for producing a composite container according to one embodiment. FIG. 5 is a horizontal cross-sectional view (a cross-sectional view taken along line VV in FIG. 4) showing a composite preform for manufacturing a composite container according to one embodiment. FIGS. 6A to 6D are perspective views showing various plastic members. FIG. 7 is a perspective view showing a composite container manufacturing apparatus for manufacturing a composite container according to one embodiment. FIG. 8 is an enlarged view (an enlarged view corresponding to a portion VIII in FIG. 7) showing a composite container manufacturing apparatus for manufacturing a composite container according to one embodiment. FIG. 9 is a side view showing a composite container manufacturing apparatus for manufacturing a composite container according to one embodiment. 10A to 10F are schematic diagrams illustrating a method for manufacturing a composite container according to one embodiment. 11A to 11C are schematic diagrams illustrating a method for manufacturing a composite container according to one embodiment. 12A to 12C are schematic diagrams illustrating a method for manufacturing a composite container according to one embodiment. FIG. 13 is a bottom view showing a modified example of the composite container according to one embodiment. FIG. 14 is a cross-sectional view (a cross-sectional view taken along line XIV-XIV in FIG. 13) illustrating a modified example of the composite container according to one embodiment. FIGS. 15A and 15B are cross-sectional views illustrating a method of removing a plastic member in a modified example of the composite container according to the embodiment. FIG. 16 is a bottom view showing a modification of the composite container according to one embodiment. FIG. 17 is a partial vertical sectional view showing a modified example of the composite container according to the embodiment, and is an enlarged view of a neck portion of the composite container. FIG. 18 is a front view showing a bottom of a modification of the composite container according to the embodiment. FIG. 19 is a bottom view showing a modified example of the composite container according to one embodiment. FIG. 20 is a vertical cross-sectional view (a cross-sectional view taken along line XX-XX in FIG. 19) showing a modified example of the composite container according to one embodiment.

  Hereinafter, an embodiment will be described with reference to the drawings. 1 to 12 are views showing an embodiment. Each figure shown below is schematically shown. Therefore, the size and shape of each part are exaggerated as appropriate to facilitate understanding. Further, the present invention can be appropriately changed and implemented without departing from the technical idea. In the following drawings, the same portions are denoted by the same reference numerals, and a detailed description thereof may be partially omitted. Further, the numerical values such as the dimensions of each member and the material names described in this specification are merely examples of the embodiment, and are not limited thereto, and can be appropriately selected and used. In this specification, terms specifying shapes and geometric conditions, such as terms such as parallel, orthogonal, and vertical, include not only strictly meaning but also substantially the same state.

Structure of the composite container First, referring to FIG. 1 to FIG. 3, the outline of the composite container according to the present embodiment.
In this specification, “upper” and “lower” refer to upper and lower sides in a state where the composite container 10A is erected (FIG. 1), respectively.

  The composite container 10A shown in FIGS. 1 to 3 uses a blow molding die 50 for a composite preform 70 (see FIGS. 4 and 5) including a preform 10a and a plastic member 40a, as described later. This is obtained by expanding the preform 10a of the composite preform 70 and the plastic member 40a integrally by performing biaxial stretch blow molding.

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

  The container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a body portion 20 provided below the neck portion 13, and a bottom portion 30 provided below the body portion 20. I have.

  On the other hand, the plastic member 40 is closely attached to the outer surface of the container main body 10 in a state of being thinly extended, and is attached to the container main body 10 without being easily moved or rotated.

  Next, the container body 10 will be described in detail. The container body 10 has the mouth 11, the neck 13, the trunk 20, and the bottom 30 as described above.

  The opening 11 has a screw portion 14 screwed to a cap (not shown) and a flange portion 17 provided below the screw portion 14. Note that the shape of the mouth portion 11 may be a conventionally known shape. The container body 10 is filled with a content such as a content liquid, and a cap (not shown) is screwed into the mouth portion 11 to produce a content-containing composite container 10A.

  The neck portion 13 is located between the flange portion 17 and the body portion 20 and has a substantially cylindrical shape having a substantially uniform diameter.

  The body 20 has a first portion 21 having a shape whose diameter gradually increases from the neck portion 13 side toward the bottom portion 30 side (a shape whose area gradually increases in a horizontal cross section), and is provided below the first portion 21. And a second portion 22 having a substantially uniform diameter as a whole. The second portion 22 has a cylindrical shape. However, the present invention is not limited to this, and the second portion 22 of the body 20 may have a polygonal cylindrical shape such as a rectangular cylindrical shape or an octagonal cylindrical shape. Alternatively, the second portion 22 of the body 20 may have a cylindrical shape having a non-uniform horizontal cross section from above to below. On the outer surface of the body portion 20, for example, unevenness such as a reduced-pressure absorption panel or a groove may be formed.

  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 20 is not limited to this, but can be reduced to, for example, about 50 μm or more and 250 μm or less. The thickness of the container body 10 at the bottom 30 is not limited to this, but can be, for example, about 0.15 mm or more and 2.0 mm or less. Further, the weight of the container body 10 is not limited to this, but can be 10 g or more and 20 g or less. 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. It is preferable to use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PC (polycarbonate) as a material of the container body 10. 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, the various resins described above may be blended and used. 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 injection molding, for example, a resin having a gas barrier property such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), or PEN (polyethylene naphthalate) (intermediate layer). After injection molding of a preform 10a having three or more layers, a multi-layer bottle having gas barrier properties may be formed by blow molding. As the intermediate layer, a resin obtained by blending the above various resins may be used.

  In addition, by mixing an inert gas (nitrogen gas, argon gas) with a melt of the thermoplastic resin, a foamed preform having a foamed cell diameter of 0.5 μm or more and 100 μm or less is formed, 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 filling capacity of 100 ml or more and 2000 ml or less. Alternatively, the container body 10 may be a large bottle having a full filling capacity of, for example, 10 L or more and 60 L or less.

  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 adhered 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 main body 10 without being adhered thereto, and is in close contact with the container main 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 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 neck portion 13, the body portion 20, and the bottom portion 30 of the container main body 10 excluding the mouth portion 11. Thereby, desired functions and characteristics can be provided to the neck portion 13, the body portion 20, and the bottom portion 30 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 entire body 20 and the bottom 30 of the container body 10 except for the mouth 11 and the neck 13. Alternatively, the plastic member 40 may be provided so as to cover the body 20 and the bottom 30 of the container main body 10 except for the mouth 11, the neck 13, and the center of the bottom 30.

  Such a plastic member 40 may have no function of contracting the preform 10a or may have a function of contracting.

  When the plastic member 40 has a function of shrinking with respect to the preform 10a, the plastic member 40 is provided outside the preform 10a, is heated integrally with the preform 10a, and is subjected to biaxial stretch blow molding. It is obtained by doing.

  Since the plastic member 40 is not welded or adhered to the container main body 10, it can be removed from the container main body 10 by being peeled off. In the present embodiment, as shown in FIGS. 1 and 3, a cutout portion 45 penetrating through the plastic member 40 is formed in the plastic member 40 at a position corresponding to the bottom 30 of the container body 10. ing. Thereby, the plastic member 40 can be separated from the cutout 45. Therefore, the plastic member 40 can be easily separated and removed from the surface of the container body 10. As a result, in the composite container 10A, the plastic member 40 can be more easily separated, and the container body 10 can be easily recycled. In addition, since the cut portion 45 is formed at a position corresponding to the bottom portion 30 of the container body 10 in the plastic member 40, it is possible to suppress the appearance of the composite container 10A from being impaired. Further, the thickness of the bottom portion 30 is generally thicker than the thickness of the body portion 20. For this reason, since the cut portion 45 is formed at a position corresponding to the bottom portion 30 of the container body 10, as described later, the cut portion 87 (see FIG. 7 and the like) is pressed against the plastic member 40 while being cut. In forming the 45, even if the cutting member 87 contacts the container body 10, it is possible to suppress a problem that a hole is opened in the container body 10. As a result, it is possible to effectively suppress the problem that the contents leak from the composite container 10A.

  As shown in FIG. 3, in the present embodiment, cut portion 45 is formed in bottom portion 30 at a position corresponding to concave portion 31. Further, a plurality of cut portions 45 are formed. Thus, the user can easily separate and remove the plastic member 40 from the container body 10 with the notch 45 as a starting point. In the present embodiment, the cutout portion 45 is formed in an arc shape, and two cutout portions 45 extending linearly along the circumferential direction of the container body 10 are formed. Further, the two cut portions 45 are formed so as to be evenly distributed by about 180 ° when viewed from the bottom direction. Further, in the circular arc shape formed by each of the cuts 45, the central angle θ is about 45 °, and two cuts 45 and the cuts 45 are formed on the circumference where the cuts 45 are formed. The portions not formed are formed so as to be evenly distributed by about 45 °. The central angle θ can be appropriately changed according to the number of cut portions 45 to be formed, and the like, and the central angle θ may be less than 45 °, for example, 30 °. The number of cuts 45 formed in the bottom 30 may be one. In this case, it is preferable that the center angle θ be equal to or less than 180 ° in the arc shape formed by the cuts 45. Thereby, it is possible to prevent the plastic member 40 from being turned up from the bottom 30 of the container body 10 starting from the cut portion 45 during transportation of the composite container 10A or the like. The number of cuts 45 formed in the bottom 30 may be three or more.

  Examples of the plastic member 40 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, fluorine resin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, Ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluoro rubber, nylon 6, nylon 6,6, aromatic polyamide, polycarbonate , Poly (ethylene terephthalate), poly (butylene terephthalate), poly (ethylene naphthalene), U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, poly Examples thereof include ether sulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, and epoxy resin. Among them, it is preferable to use a thermoplastic inelastic resin such as polyethylene (PE) such as low density polyethylene (LDPE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Further, a blend material, a multilayer structure, or a partial multilayer structure thereof may be used. Furthermore, various additives other than the main component resin may be added to the material of the plastic member 40 as long as the properties are not impaired. Examples of additives include a plasticizer, an ultraviolet stabilizer, a coloring inhibitor, a matting agent, a deodorant, a flame retardant, a weathering agent, an antistatic agent, a yarn friction reducing agent, a slip agent, a release agent, An oxidizing agent, an ion exchange agent, a coloring pigment, and the like can be added. Further, by mixing an inert gas (nitrogen gas, argon gas) with a melt of the thermoplastic resin, a foamed member having a foamed cell diameter of 0.5 μm or more and 100 μm or less is used, and the foamed preform is molded. Thereby, the light shielding property can be improved.

  The plastic member 40 may be made of a material having a light-barrier property for blocking invisible light such as ultraviolet light. 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. Further, a foamed member having a foam cell diameter of 0.5 μm or more and 100 μm or less produced by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin may be used.

  The plastic member 40 may be made of a material (a material with low thermal conductivity) having a higher heat insulating property or heat insulating property 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 coolness or heat retention of the composite container 10A is enhanced. 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. Examples of such a material include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, and melamine resin. It is preferable to mix hollow particles with a resin material containing these resins. The average particle diameter of the hollow particles is preferably from 1 μm to 200 μm, more preferably from 5 μm 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, Ropeike HP-1055, Ropeke HP-91, Ropeke OP-84J, Ropeke Ultra, Ropeke SE, Ropeke ST (manufactured by Rohm and Haas Co., Ltd.), Nipol MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782 And SX866 (manufactured by JSR Corporation) 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, based on 100 parts by mass of the resin material contained in the plastic member 40. More preferably, there is.

  Further, the plastic member 40 may be made of a material that is less slippery than the plastic material constituting 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.

  The plastic member 40 may be colored red, blue, yellow, green, brown, black, white, or the like, and may be transparent or opaque.

  The thickness of the plastic member 40 is not limited to this, but may be, for example, about 5 μm or more and 500 μm or less when attached to the container body 10.

Configuration of Composite Preform Next, the configuration of the composite preform will be described with reference to FIGS.

  As shown in FIGS. 4 and 5, 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 11a, a trunk 20a connected to the mouth 11a, and a bottom 30a connected to the trunk 20a. The mouth 11 a corresponds to the mouth 11 of the container body 10 described above, and has substantially the same shape as the mouth 11. The body 20a corresponds to the neck 13 and the body 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 region of the trunk portion 20a and the entire region of the bottom portion 30a of the preform 10a.

  The plastic member 40a may be provided in the whole area or a part of the area other than the mouth 11a. Alternatively, the plastic member 40a may be provided so as to cover the trunk 20a except for the bottom 30.

  Such a plastic member 40a may not have a function of contracting to the preform 10a, or may have a function of contracting.

  When the plastic member 40a has an action of contracting, the plastic member 40a is, for example, one that contracts (for example, heat shrinks) to the preform 10a when an external action (for example, heat) is applied. You may be. Alternatively, the plastic member 40a may have shrinkage or elasticity itself, and may be shrunk without applying an external action.

  When the plastic member 40a has a heat shrinking action, the lower end of the plastic member 40a (the end opposite to the mouth 11a) is inserted after the cylindrical plastic member 40a is fitted into the preform 10a. May be thermocompression-bonded.

  As the plastic member 40a, for example, a direct blow tube produced by direct blow molding, a sheet molded tube produced by sheet molding, an extruded tube produced by extrusion molding, an injection molded tube produced by injection molding, inflation molding Can be used, but the present invention is not limited to this, and a molding method other than the above may be used.

  The plastic member 40a may be colored red, blue, yellow, green, brown, black, white, or the like, and may be transparent or opaque.

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

  As shown in FIG. 6A, the plastic member 40 a has a bottomed cylindrical shape as a whole, and may have a cylindrical body 41 and a bottom 42 connected to the body 41. . In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, various functions and characteristics such as barrier properties are imparted to the bottom portion 30 in addition to the body portion 20 of the composite container 10A. Can be. Examples of such a plastic member 40a include the above-described direct blow tube, sheet molding tube, and injection molding tube.

  In addition, as shown in FIG. 6B, the plastic member 40a may have a cylindrical body 41 as a whole in a tubular shape (bottomless cylindrical shape). In this case, as the plastic member 40a, for example, the blow tube, the extrusion tube, the inflation molded tube, and the sheet molded tube described above can be used.

  Further, as shown in FIGS. 6C and 6D, the plastic member 40a may be manufactured by forming a film into a cylindrical shape and bonding the ends thereof. In this case, as shown in FIG. 6C, the plastic member 40a may be formed in a tube shape (bottomless cylindrical shape) having a body portion 41, and as shown in FIG. The bottom portion 42 may be bonded to form a bottomed cylindrical shape.

Configuration of Manufacturing Apparatus for Composite Container Next, the configuration of the manufacturing apparatus 80 for a composite container according to the present embodiment will be described with reference to FIGS. This composite container manufacturing apparatus 80 is for forming a cutout 45 penetrating the plastic member 40 in the plastic member 40 provided in close contact with the outside of the container body 10.

  The composite container manufacturing apparatus 80 includes a base portion 81, a driving portion 82 disposed on the base portion 81, and a notch portion attached to the driving portion 82 and penetrating the plastic member 40 with respect to the plastic member 40. And a processing part 83 for forming the second part 45.

  The base section 81 supports the driving section 82. In the present embodiment, the base portion 81 is supported by a frame combination 90 described later. However, the present invention is not limited to this, and the base portion 81 may be arranged so as to be in direct contact with the floor of the work space.

  The driving section 82 has a main body 84 disposed on the base 81, and a rod 85 that can advance and retreat in a predetermined direction (the left-right direction in FIG. 9) with respect to the main body 84. Further, a processing portion 83 is attached to the rod 85. The rod 85 is freely protruding and retractable with respect to the main body 84, and has a traveling position (see FIG. 11B) protruding from the main body 84 in a predetermined direction (leftward in FIG. 9). A part is configured to be able to advance and retreat to and from a retracted position (see FIGS. 7 to 9) retracted into the main body 84. In this case, the rod 85 is guided by the guide member 85a.

  The drive unit 82 further includes a lever 86 that switches between the advancing position and the retracted position of the rod 85, and is configured such that the rotating operation of the lever 86 switches between the advancing position and the retracted position of the rod 85. Have been. In addition, as the drive unit 82, for example, an air cylinder can be used. In this case, for example, when the lever 86 is rotated from the initial position (see FIGS. 7 and 9), air is supplied into a cylinder (not shown) of the air cylinder, and the rod 85 takes the advanced position. On the other hand, when the lever 86 is returned to the initial position, air can be discharged from the inside of the air cylinder (not shown), and the rod 85 can be set to the retracted position. In this case, when the rod 85 assumes the advancing position, the amount of protrusion of the rod 85 from the main body 84 is determined by the distance between the processing unit 83 and the container body 10 when the rod 85 assumes the retracted position. It can be set appropriately based on the settings. That is, the projecting amount of the rod 85 is such that when the rod 85 assumes the advancing position, a cutting member 87 described later of the processing unit 83 penetrates the plastic member 40 and does not damage the container body 10. Projecting amount.

  The processing part 83 forms the cut part 45 in the plastic member 40. The processing portion 83 is provided so as to be movable in a predetermined direction (horizontal direction), and is also provided so as to be rotatable about a rotation axis X (first rotation axis) extending along the predetermined direction. I have. Further, the processing unit 83 includes a main body 83a and a cutting member 87 attached to the main body 83a. In the present embodiment, the processing portion 83 includes two cutting members 87, and each of the cutting members 87 is attached to the upper portion and the lower portion of the main body portion 83a, respectively. Further, in the present embodiment, the cutting member 87 has a circular shape and is provided rotatably about a rotation axis Y (second rotation axis) orthogonal to the rotation axis X. In this case, as an example, the cutting member 87 may be a round blade cutter.

  The processing unit 83 is configured to form the cutout 45 in the plastic member 40 by rotating the cutting member 87 while pressing the cutting member 87 against the plastic member 40. I have. That is, when the processing unit 83 rotates about the rotation axis X, the cutting member 87 attached to the main body 83a rotates about the rotation axis X. Thus, the cutting member 87 is configured to form the cutout 45 in the plastic member 40. Further, as described above, the cutting member 87 is provided rotatably with respect to the rotation axis Y. For this reason, when the cutting member 87 is rotated with respect to the rotation axis X while being pressed against the plastic member 40 when the notch 45 is formed, the cutting member 87 itself is aligned with the rotation axis Y. Rotate (rotate). Thereby, when forming the cutout portion 45, it is possible to suppress the occurrence of burrs and the like in the cutout portion 45 and to suppress the wear of the cutting member 87.

  The processing portion 83 comes into contact with the plastic member 40 when the rod 85 takes the advancing position, and the processing portion 83 does not come into contact with the plastic member 40 when the rod 85 takes the retracted position. It is supposed to be. In this case, the amount by which the cutting member 87 of the processing portion 83 is pressed against the plastic member 40 is adjusted by the protrusion amount of the rod 85 described above. By adjusting the amount of pressing of the cutting member 87 against the plastic member 40 as described above, the container body 10 is not damaged when the cut portion 45 is formed on the plastic member 40 by the processing portion 83. Can be suppressed.

  The processing unit 83 further includes a lever 83b for rotating the processing unit 83, and the processing unit 83 is configured to rotate with respect to the rotation axis X by the rotation of the lever 83b. I have. In this case, by turning the lever 83b from the initial position (see FIGS. 7 to 9) in a state where the rod 85 is in the advancing position, the cutting member 87 is turned, and the cutting member 87 is made of plastic. An arc-shaped cut portion 45 is formed in the member 40.

  Further, the composite container manufacturing apparatus 80 further includes a support portion 88 that supports the container body 10. The support portion 88 is attached to a frame combination 90 described later. In the present embodiment, the support portion 88 supports the container main body 10 in a state where the container main body 10 is turned sideways so that the bottom portion 30 of the container main body 10 faces the processing portion 83. The support portion 88 has a first support portion 88a that supports the mouth portion 11 of the container body 10 and a second support portion 88b that supports the body portion 20 of the container body 10. As shown in FIG. 7, a concave portion 88c having a shape corresponding to the shape of the mouth portion 11 of the container body 10 is formed in the first support portion 88a, and the mouth portion 11 of the container body 10 is formed in the recess portion 88c. It is to be accommodated. An opening 88d having an inner diameter larger than the outer diameter of the second portion 22 of the body 20 of the container body 10 is formed in the second support portion 88b, and the opening of the container body 10 is formed in the opening 88d. The trunk 20 is accommodated.

  As shown in FIGS. 7 to 9, the composite container manufacturing apparatus 80 further includes a rotation restricting portion 89 that restricts the rotation of the container main body 10. The rotation restricting portion 89 is fixed to the distal end of the rod 85 of the driving portion 82 and has a shape corresponding to the bottom 30 of the container body 10. When the rod 85 assumes the advancing position, the rotation restricting portion 89 is fitted into the concave portion 31 of the bottom portion 30 of the container body 10 and presses the container body 10 in a predetermined direction (leftward in FIG. 9). . Thereby, the flange portion 17 of the container body 10 is pressed against the first support portion 88a of the support portion 88, and the rotation of the container body 10 is restricted. Further, the rotation restricting portion 89 is configured not to rotate with respect to the rotation axis X even when the processing portion 83 rotates. Therefore, the rotation of the rotation restricting portion 89 fitted into the concave portion 31 of the bottom portion 30 of the container main body 10 can prevent the container main body 10 from rotating together with the rotation restricting portion 89. .

  Next, an example of the frame combination 90 supporting the base 81 will be described.

  The frame combination 90 has a support member 91 and a height adjustment member 92 arranged on the support member 91.

  The support member 91 is disposed on the floor of the work space. The support member 91 is composed of a pair of quadrangular prism-shaped members, and each member is disposed so as to extend along the rotation axis X.

  The height adjusting member 92 is formed of a quadrangular prism-shaped member, and is arranged so as to extend along the width direction of the support member 91 (the direction orthogonal to the rotation axis X). The height adjusting member 92 plays a role in adjusting the height of the base portion 81, the guide member 85a, and the support portion 88. Thereby, the cut portion 45 can be formed at the position corresponding to the bottom portion 30 of the container body 10 among the plastic members 40 provided in close contact with the outside of the container body 10 by the processing portion 83. Has become.

  In the frame combination 90, the above-described members may be fixed to each other by bolts or the like.

Manufacturing Method of Composite Container Next, referring to FIGS. 10 (a) to (f), FIGS. 11 (a) to (c), and FIGS. 12 (a) to (c), a manufacturing method of the composite container 10A according to the present embodiment. Will be described.

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

  Next, by providing a plastic member 40a outside the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a closely adhered to the outside of the preform 10a is manufactured (FIG. 10 ( b)). In this case, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body 41 and a bottom 42 connected to the body 41.

  At this time, 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 to be in close contact with the outer surface of the preform 10a. Alternatively, as described below, a heat-shrinkable plastic member 40a is provided on the outer surface of the preform 10a, and the plastic member 40a is heated to 50 ° C. to 100 ° C. so as to be thermally shrunk to form an outer surface of the preform 10a. May be adhered to.

  As described above, the plastic member 40a is brought into close contact with the outside of the preform 10a in advance, and the composite preform 70 is produced, whereby a series of steps for producing the composite preform 70 (FIGS. 10A to 10B). )) And a series of steps for performing blow molding (FIGS. 10 (c) to 10 (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. 10C). At this time, the composite preform 70 is 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 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Further, a blow mold 50 is prepared. Then, the composite preform 70 heated by the heating device 51 is sent to a blow molding die 50 for producing the composite container 10A (see FIG. 10D).

  The container body 10 and the plastic member 40 provided in close contact with the outside of the container body 10 are manufactured using the blow molding die 50. In this case, the blow mold 50 includes a mold body 52 that is a metal mold or a resin mold. The mold body 52 includes a pair of body molds 50a and 50b that are divided from each other, and a bottom mold 50c. (See FIG. 10D). The inner surface of the mold main body 52 has a shape corresponding to the neck portion 13, the trunk portion 20, and the bottom portion 30 of the composite container 10A. In FIG. 10D, the pair of body molds 50a and 50b are open to each other, and the bottom mold 50c is raised upward. In this state, the composite preform 70 is inserted between the pair of body molds 50a and 50b of the mold body 52.

  Next, as shown in FIG. 10E, after the bottom mold 50c is lowered, the pair of body dies 50a and 50b are closed, and the pair of body dies 50a and 50b of the mold body 52 and the bottom are closed. A closed blow molding mold 50 is constituted by the mold 50c. Next, air is press-fitted into the preform 10a, and biaxial stretch blow molding is performed on the composite preform 70.

  Thereby, the composite preform 70 is formed into a shape corresponding to the inner surface of the blow molding die 50, and the container body 10 is obtained from the preform 10a in the blow molding die 50. During this time, the body molds 50a and 50b are heated to 30 ° C to 80 ° C, and the bottom mold 50c is cooled to 5 ° C to 25 ° C. At this time, in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded. As a result, the preform 10a and the plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50.

  Thus, the container body 10 and the plastic member 40 provided in close contact with the outside of the container body 10 are obtained.

  Thereafter, as shown in FIG. 10 (f), the pair of body dies 50 a and 50 b and the bottom die 50 c of the mold body 52 are separated from each other, and the container body 10 and the container body 10 are separated from the blow molding mold 50. The plastic member 40 provided in close contact with the outside is taken out.

  Next, a cutout portion 45 penetrating the plastic member 40 is formed in the plastic member 40 after blow molding. In this case, the cutting member 87 is rotated while pressing the cutting member 87 against the plastic member 40 to form the cut portion 45. At this time, first, the composite container manufacturing apparatus 80 is prepared. Next, as shown in FIG. 11A, the container body 10 is attached to the support portion 88 of the composite container manufacturing apparatus 80. At this time, the mouth 11 of the container body 10 is accommodated in the recess 88c of the first support portion 88a, and the second portion 22 of the body 20 of the container body 10 is accommodated in the opening 88d of the second support portion 88b. Is done. In this case, the lever 86 of the drive unit 82 is at the initial position, and the rod 85 of the drive unit 82 is in the retracted position.

  Next, the user rotates the lever 86 from the initial position. As a result, as shown in FIG. 11B, the rod 85 projects from the main body 84 of the drive unit 82 in a predetermined direction (to the left in FIG. 9), and the rod 85 assumes the advancing position. As a result, the rotation restricting portion 89 (see FIG. 8) attached to the tip of the rod 85 fits into the concave portion 31 (see FIGS. 1 and 3) of the bottom portion 30 of the container body 10, and the container body 10 is brought into the predetermined position. (Left side in FIG. 9). Thereby, the flange portion 17 of the container body 10 is pressed against the first support portion 88a of the support portion 88. At this time, the cutting member 87 is pressed to a position corresponding to the bottom 30 of the container body 10 in the plastic member 40.

  Next, the user rotates the lever 83b of the processing unit 83. This causes the cutting member 87 to rotate with respect to the rotation axis X, as shown in FIG. At this time, the flange portion 17 of the container body 10 is pressed against the first support portion 88a of the support portion 88 by the rotation restricting portion 89 (see FIG. 8) as described above. Further, the rotation restricting section 89 is fixed to the rod 85, and is configured not to rotate even when the processing section 83 rotates. Thereby, the rotation of the container body 10 is regulated. Therefore, an arc-shaped notch 45 (see FIG. 3) is formed in the plastic member 40 at a position corresponding to the bottom 30 of the container body 10 with the rotation of the cutting member 87. By forming the cutout 45 at a position corresponding to the bottom 30 of the container body 10 in this manner, it is possible to suppress the appearance of the composite container 10A from being impaired. Further, the processing portion 83 includes two cutting members 87. Thereby, two cuts 45 (see FIGS. 1 and 3) are formed in the plastic member 40. For this reason, in the composite container 10A, the plastic member 40 can be easily separated.

  Further, when forming the cutout 45, the cutting member 87 rotates (rotates) with respect to the rotation axis Y (see FIGS. 7 to 9). That is, when the cutting member 87 is rotated while pressing the cutting member 87 against the plastic member 40, the cutout 45 is formed in the plastic member 40 while the cutting member 87 itself rotates. As a result, burrs and the like are less likely to be generated in the cut portion 45, and wear of the cutting member 87 is also suppressed.

  Next, the user rotates the lever 83b to return the lever 83b to the initial position (see FIG. 12A).

  Next, the user rotates the lever 86 to return the lever 86 to the initial position. Thereby, as shown in FIG. 12B, a part of the rod 85 is pulled into the main body 84 of the driving unit 82.

  Then, the user removes the composite container 10A from the support portion 88 of the composite container manufacturing apparatus 80. In this way, a composite container 10A is obtained as shown in FIG.

  Thereafter, the contents are filled into the composite container 10A through the mouth 11 of the composite container 10A.

  By the way, when recycling the container body 10, it is necessary to separate and remove the plastic member 40 of the composite container 10A from the container body 10. In this case, the plastic member 40 can be easily separated and removed from the container body 10 with the notch 45 as a starting point. Therefore, in the composite container 10A, the plastic member 40 can be easily separated.

  As described above, according to the present embodiment, the cutout 45 penetrating the plastic member 40 is formed in the plastic member 40 after the blow molding. Thereby, the cut portion 45 can be easily formed at a desired position of the composite container 10A. For this reason, the plastic member 40 can be easily separated from the container body 10 and removed. Further, by forming the cutout 45 penetrating through the plastic member 40 in the plastic member 40 after blow molding, for example, the amount of pushing of the plastic member 40a into the preform 10a and the heat of the plastic member 40a are reduced. The cut portion 45 having a desired shape can be formed without considering the amount of shrinkage and the like. For this reason, the cut portion 45 can be easily formed, and the productivity of the composite container 10A can be improved. At this time, the cutout 45 is formed by rotating the cutting member 87 while pressing the cutting member 87 against the plastic member 40. Thereby, the cutting member 87 can surely cut the plastic member 40, and the step of forming the cut portion 45 can be facilitated.

  Further, according to the present embodiment, since the plastic member 40 can be separated and removed from the container main body 10, the colorless and transparent container main body 10 can be recycled as in the related art.

  Further, according to the present embodiment, cutout portion 45 is formed at a position in plastic member 40 corresponding to bottom 30 of container body 10. Thereby, it can suppress that the external appearance of 10 A of composite containers is impaired. For this reason, it can suppress that the design property of 10 A of composite containers falls. Further, the thickness of the bottom portion 30 is generally thicker than the thickness of the body portion 20. Therefore, by forming the cut portion 45 at a position corresponding to the bottom portion 30 of the container main body 10, even if the cutting member 87 contacts the container main body 10, a hole is opened in the container main body 10. It is possible to suppress such a trouble. As a result, it is possible to effectively prevent the contents from leaking out of the container body 10.

  Further, according to the present embodiment, a plurality of cut portions 45 are formed. Thereby, in composite container 10A, separation of plastic member 40 can be made easier.

  Further, according to the present embodiment, the plurality of cut portions 45 are formed by the plurality of cutting members 87. Thus, the step of forming the cutout 45 can be facilitated.

  Further, according to the present embodiment, the composite container manufacturing apparatus 80 includes the base 81, the driving unit 82 disposed on the base 81, and the driving unit 82, And a processing portion 83 that forms a cut portion 45 that penetrates the plastic member 40. Further, the processing portion 83 is provided so as to be movable in a predetermined direction, and is also provided so as to be rotatable about a rotation axis X extending along the predetermined direction. Thus, the notch 45 can be easily formed in the plastic member 40 by driving the processing part 83 by the driving part 82 and rotating the processing part 83.

  Further, according to the present embodiment, the processing portion 83 includes the cutting member 87. The cutting member 87 has a circular shape and is provided rotatably about a rotation axis Y orthogonal to the rotation axis X. Thus, when the cutting member 87 is rotated with respect to the rotation axis X while being pressed against the plastic member 40, the cutting member 87 itself is rotated with respect to the rotation axis Y. Thereby, when forming the cutout portion 45, it is possible to suppress the occurrence of burrs and the like in the cutout portion 45 and to suppress the wear of the cutting member 87.

  Further, according to the present embodiment, the composite container manufacturing apparatus 80 further includes the support portion 88 that supports the container body 10. Thereby, the cut portion 45 can be stably formed at a desired position of the composite container 10A. For this reason, the cut portion 45 can be easily formed, and the productivity of the composite container 10A can be improved.

  Further, according to the present embodiment, the composite container manufacturing apparatus 80 further includes the rotation restricting portion 89 that restricts the rotation of the container main body 10. Accordingly, the rotation of the container body 10 can be restricted, and by rotating the cutting member 87, the cutout 45 can be easily formed at a position corresponding to the bottom 30 of the container body 10 in the plastic member 40. Can be formed.

  In the above embodiment, the plastic member 40 around the cut portion 45 may be contracted by heating the plastic member 40 around the cut portion 45 after forming the linear cut portion 45. At this time, the plastic member 40 around the cut portion 45 may be heated using hot air such as a heat gun. As a heating method, steam, a heated jig, or a laser may be used in addition to hot air such as a heat gun or a dryer. In the case of steam, it is conceivable to use a shrink tunnel when attaching a shrink label. Further, when heating the plastic member 40 around the cut portion 45, the periphery thereof may be heated to the extent that the container is not deformed. In this case, the portion between the plurality of cuts 45 can be raised with respect to the container body 10 by the contraction of the plastic member 40 around the cuts 45. This makes it easier for the user to grip the portion between the plurality of cuts 45, and the plastic member 40 can be easily separated from the container body 10 and removed. When the plastic member 40 around the cut portion 45 is contracted by heating the plastic member 40 around the cut portion 45, a plastic member having a contracting action is used as the plastic member 40.

  In the above-described embodiment, an example has been described in which the cutout portion 45 is formed at a position corresponding to the bottom portion 30 of the container body 10 in the plastic member 40. However, the present invention is not limited to this, and the cutout portion 45 may be formed, for example, at a position corresponding to the neck portion 13 or the trunk portion 20 of the container body 10 in the plastic member 40. Also in this case, the plastic member 40 can be easily separated from the container body 10 and removed.

  Further, in the above-described embodiment, an example in which the notch 45 is formed by rotating the cutting member 87 has been described. However, the present invention is not limited to this, and the container body 10 may be rotated in the step of forming the notch 45. In this case, in the composite container manufacturing apparatus 80, the container main body 10 can be rotated about the rotation axis X by removing the rotation restricting section 89 from the rod 85 of the driving section 82. Also in this case, the notch 45 can be formed in the plastic member 40.

  In the above-described embodiment, an example has been described in which the processing unit 83 includes two cutting members 87. However, the present invention is not limited thereto, and the processing unit 83 may include only one cutting member 87, and the processing unit 83 may include three or more cutting members 87.

  As shown in FIGS. 13 and 14, an annular projection (first projection) 33 is formed in the recess 31 of the bottom 30, and a cutout 45 is formed at a position adjacent to the projection 33. May be. As shown in FIG. 13, the protrusion 33 is formed over the entire circumference of the recess 31 of the bottom 30. In addition, the protrusion 33 may be formed only on a part of the recess 31 of the bottom 30 in the circumferential direction.

  As shown in FIG. 14, the protrusion 33 includes a base end 33a and a front end 33b. Further, the height H1 of the protrusion 33 (the maximum protrusion amount of the protrusion 33) can be about 0.3 mm or more and 0.5 mm or less. In FIG. 14, the outer surface of the concave portion 31 of the bottom portion 30 when the protrusion 33 is not formed is indicated by a two-dot chain line (virtual line).

  The width W1 (length along a direction perpendicular to the height direction of the projection 33 in the vertical cross section) of the projection 33 at the center position in the height direction of the projection 33 is 0.3 mm or more and 2.5 mm or less. Degree. Such a protrusion 33 is formed at the time of blow molding by providing a concave portion on the inner surface of the bottom mold 50 c of the blow mold 50. In this case, a depression 34 corresponding to the projection 33 is formed on the inner surface of the bottom 30 of the container body 10.

  In the present modified example, the cutout portion 45 is formed radially outward from the distal end portion 33 b of the projection 33. The notch 45 extends in an arc along the outer edge of the protrusion 33. In this case, it is preferable that the cut portion 45 be formed so as to reach the base end portion 33 a of the protrusion 33. Accordingly, as described later, a portion of the plastic member 40 that has been separated from the bottom 30 of the container body 10 extends along the protrusion 33, and a separated piece P (see FIG. 15B) is formed. For this reason, the plastic member 40 can be easily separated from the container body 10 and removed.

  When such a cut portion 45 is formed, first, as described with reference to FIG. 10, biaxial stretch blow molding is performed on the composite preform 70. At this time, a projection (first projection) 33 is formed on the bottom 30 of the container body 10. Next, as described with reference to FIGS. 11 and 12, the cut portion 45 is formed by the composite container manufacturing apparatus 80. At this time, the cut 45 is formed at a position adjacent to the protrusion 33. In addition, the cutout 45 is formed radially outward from the tip 33 b of the protrusion 33. Further, the notch 45 is formed so as to reach the base end 33 a of the projection 33. Thus, the composite container 10A shown in FIGS. 13 and 14 is obtained.

  By the way, as described above, the cut portion 45 is formed at a position adjacent to the protrusion 33. In this case, as shown in FIG. 15A, the user can easily break the plastic member 40 by hooking the user's toe on the protrusion 33, using the notch 45 as a trigger. For this reason, the plastic member 40 is easily peeled off from the bottom 30 of the container body 10. The cutout 45 is formed so as to reach the base end 33 a of the protrusion 33. For this reason, as shown in FIG. 15B, a portion of the plastic member 40 that has been separated from the bottom 30 of the container body 10 extends along the protrusion 33, and a separated piece P is formed. In addition, a gap G is formed between the separation piece P and the bottom 30. For this reason, it becomes easy for a user to pinch the strip P. As a result, the plastic member 40 can be easily separated from the container body 10 and removed.

  As described above, according to this modification, the annular projection 33 is formed in the recess 31 of the bottom 30, and the cutout 45 is formed at a position adjacent to the projection 33. For this reason, the user can easily break the plastic member 40 by hooking the user's toe on the protrusion 33, triggered by the notch 45. As a result, the plastic member 40 is easily peeled off from the bottom 30 of the container body 10, and the plastic member 40 can be easily separated from the container body 10 and removed.

  Note that, as shown in FIG. 16, the notch 45 may be formed radially inward of the tip 33 b of the protrusion 33. That is, the cut portion 45 may extend in an arc shape along the inner edge of the protrusion 33. Also in this case, the user can hook the toe of the user on the protrusion 33 to easily break the plastic member 40 with the cutout 45 as a trigger, and the plastic member 40 can be connected to the container body 10. And can be easily separated and removed.

  As shown in FIG. 17, a protrusion (second protrusion) 331 protruding radially outward is formed on the neck 13, and the cutout 45 is formed at a position adjacent to the protrusion 331. Is also good. The protrusion 331 may be formed over the entire circumference of the neck 13 or may be formed on only a part of the neck 13 in the circumferential direction.

  The protrusion 331 includes a base end 331a and a front end 331b. Further, the height H2 (the maximum amount of protrusion in the radial direction) of the protrusion 331 can be set to about 0.3 mm or more and 0.5 mm or less. In FIG. 17, the outer surface of the neck portion 13 when the projection 331 is not formed is indicated by a two-dot chain line (virtual line).

  Further, the width W2 (length along the vertical direction) of the projection 331 at the center position in the height direction of the projection 331 can be about 0.3 mm or more and 2.5 mm or less. Such projections 331 are formed at the time of blow molding by providing recesses on the inner surfaces of the pair of body molds 50a and 50b of the blow molding mold 50. In this case, a depression 332 corresponding to the projection 331 is formed on the inner surface of the neck 13 of the container body 10.

  In the present modified example, the notch 45 is formed above the tip 331 b of the projection 331. The notch 45 is formed all around the neck 13. The notch 45 may be formed so as to reach the base end 331a of the protrusion 331. Although not shown, also in this case, a portion of the plastic member 40 that has been separated from the neck portion 13 of the container body 10 extends along the protrusion 331, and a separated piece is formed. Further, since a gap is formed between the peeling piece and the neck portion 13, it becomes easier for the user to grip the peeling piece. As a result, the plastic member 40 can be easily separated from the container body 10 and removed. The cut 45 may be formed only in a part of the neck 13 in the circumferential direction.

  When such a cut portion 45 is formed, first, as described with reference to FIG. 10, biaxial stretch blow molding is performed on the composite preform 70. At this time, a projection (second projection) 331 is formed on the neck 13 of the container body 10. Next, the notch 45 is formed by the composite container manufacturing apparatus 80. At this time, for example, first, the support portion 88 and the rotation restricting portion 89 are removed from the composite container manufacturing apparatus 80. Next, the cutting member 87 is brought into contact with the plastic member 40 at a position corresponding to the neck 13 of the container body 10. Then, by rotating (rotating) the composite container 10A about its central axis, a cutout portion 45 extending along the circumferential direction can be formed at a position corresponding to the neck portion 13 of the container main body 10. At this time, the cut portion 45 is formed at a position adjacent to the protrusion 331. The notch 45 is formed above the protrusion 331. Further, the notch 45 is formed so as to reach the base end 331 a of the protrusion 331. Thus, the composite container 10A shown in FIG. 17 is obtained.

  As described above, according to the present modified example, the projection 331 protruding radially outward is formed on the neck portion 13, and the cutout 45 is formed at a position adjacent to the projection 331. Therefore, the user can easily break the plastic member 40 by hooking the user's toe on the protrusion 331, triggered by the notch 45. As a result, the plastic member 40 is easily peeled off from the neck portion 13 of the container body 10, and the plastic member 40 can be easily separated from the container body 10 and removed.

  By the way, in the composite container 10A, the diameter of the neck portion 13 of the container body 10 is smaller than the diameter of the body portion 20 of the container body. That is, when the preform 10a and the plastic member 40a are integrally expanded by blow molding, the neck portion 13 of the container body 10 is a portion where the stretching ratio in the circumferential direction is smaller than that of the body portion 20 of the container body. . Thus, the portion of the plastic member 40 corresponding to the neck 13 of the container body 10 is thicker than the portion corresponding to the trunk 20 of the container body 10. For this reason, by forming the cut portion 45 at a position corresponding to the neck portion 13 of the container body 10 in the plastic member 40, the thick plastic member 40 can be easily broken using the cut portion 45 as a trigger. As a result, the plastic member 40 can be easily separated from the container body 10 and removed.

  Although not shown, the notch 45 may be formed below the tip 331 b of the protrusion 331. Also in this case, the user can easily hook a finger on the cutout 45, and the plastic member 40 can be easily separated from the container body 10 and removed.

  Furthermore, in the above-described embodiment, an example has been described in which the bottom portion 30 has the concave portion 31 located at the center and the ground portion 32 provided around the concave portion 31. However, the present invention is not limited to this, and the bottom portion 30 may have a petaloid shape as shown in FIGS. In this case, the bottom portion 30 has a central portion 131 located at the center, and a plurality (five in this case) of petaloid legs 132 radially extending from the central portion 131 toward the peripheral portion 30b of the bottom portion 30. .

  As shown in FIG. 19, the five petaloid legs 132 are arranged at equal intervals in the circumferential direction along the peripheral edge 30b of the bottom 30. It is preferable that five or more petaloid legs 132 are provided in order to stably erect the composite container 10A, but from the viewpoint of moldability and the like, the upper limit is preferably about nine. In order to effectively prevent buckling, the number of the petaloid legs 132 is preferably an odd number, and particularly preferably five.

  As shown in FIGS. 19 and 20, each of the petaloid legs 132 includes a ground contact portion 132a extending circumferentially, an inner inclined surface 132b extending upward from the ground contact portion 132a toward the central portion 131, and a ground contact portion. An outer inclined surface 132c extending upward from 132a toward the peripheral portion 30b side.

  On the other hand, a valley 133 is formed between the adjacent petaloid legs 132. Each valley 133 has a curved surface extending upward from the central portion 131 toward the peripheral edge 30b. Each valley 133 forms a part of a spherical surface that curves downward in a cross section from the center 131 to the peripheral edge 30b (see FIG. 20). In this case, each valley 133 may consist of a part of a dome-shaped curved surface.

  In this case, as shown in FIG. 19 and FIG. 20, the cutout portion 45 can be formed at a position corresponding to the central portion 131.

  Further, in the above embodiment, the container body 10 has the mouth portion 11, the neck portion 13 provided below the mouth portion 11, the body portion 20 provided below the neck portion 13, and the bottom portion provided below the body portion 20. 30 has been described. However, the present invention is not limited to this, and although not shown, the container body 10 is located between the neck 13 and the body 20 and has a shape whose diameter gradually increases from the neck 13 toward the body 20. A shoulder 12 may be provided.

  Further, in the above-described embodiment, the body portion 20 is provided below the first portion 21 and the first portion 21 having a shape whose diameter gradually increases from the neck portion 13 side toward the bottom portion 30 side. And the second portion 22 having a substantially uniform diameter. However, the present invention is not limited thereto, and the body 20 may have a cylindrical shape having a substantially uniform diameter as a whole.

  Further, in the above-described embodiment, an example in which the notch 45 is formed by the composite container manufacturing apparatus 80 has been described. However, the present invention is not limited to this, and the notch 45 may be formed manually by the user.

  A plurality of constituent elements disclosed in the above-described embodiments and modified examples can be appropriately combined as needed. Alternatively, some components may be deleted from all the components shown in the above-described embodiment and the modification.

DESCRIPTION OF SYMBOLS 10 Container main body 10A Composite container 10a Preform 11 Mouth part 20 Body part 30 Bottom part 40, 40a Plastic member 45 Notch part 50 Blow molding die 80 Composite container manufacturing apparatus 81 Base part 82 Drive part 83 Processing part 87 Cutting member 87 88 Supporting part 89 Rotation regulating part

Claims (18)

In the method for manufacturing a composite container,
Preparing a preform;
A step of providing a plastic member outside the preform,
By performing blow molding on the preform and the plastic member using a blow molding mold, the preform and the plastic member are integrally expanded, and a container body corresponding to the preform, A step of producing a plastic member provided in close contact with the outside of the container body,
Forming a cut portion penetrating the plastic member for the plastic member after blow molding,
In the step of forming the cut portion, the cut portion is formed by rotating the cutting member or the container body while pressing the cutting member against the plastic member.   2. The composite container according to claim 1, wherein in the step of forming the cut portion, the cut portion is formed at a position corresponding to at least one of a neck portion and a bottom portion of the container body in the plastic member. Manufacturing method.   The method for manufacturing a composite container according to claim 1, wherein a plurality of the cut portions are formed in the step of forming the cut portions.   The method for manufacturing a composite container according to claim 3, wherein in the step of forming the cut portions, the plurality of cut portions are formed by a plurality of the cutting members.   The method for manufacturing a composite container according to any one of claims 1 to 4, further comprising a step of heating the plastic member around the cut portion to shrink the plastic member around the cut portion.   The method for manufacturing a composite container according to claim 1, wherein the notch has an arc shape.   In the step of producing a container body corresponding to the preform and a plastic member provided in close contact with the outside of the container body, an annular first protrusion is formed on a bottom of the container body, The method of manufacturing a composite container according to claim 1, wherein in the step of forming the cut portion, the cut portion is formed at a position adjacent to the first protrusion.   In the step of producing a container body corresponding to the preform and a plastic member provided in close contact with the outside of the container body, a second protrusion protruding radially outward on a neck of the container body. 8. The method of manufacturing a composite container according to claim 1, wherein, in the step of forming the notch, the notch is formed at a position adjacent to the second protrusion. 9. . Container container, and a plastic member provided in close contact with the outside of the container body, a composite container manufacturing apparatus for manufacturing a composite container comprising,
A base part,
A drive unit disposed on the base unit;
A processing unit attached to the drive unit and forming a cutout penetrating the plastic member with respect to the plastic member,
The manufacturing apparatus for a composite container, wherein the processing unit is provided movably in a predetermined direction and is rotatably provided with respect to a first rotation axis extending along the predetermined direction.   The composite container manufacturing apparatus according to claim 9, wherein the processing unit includes a cutting member.   The cutting member has a circular shape, and is provided rotatably with respect to a second rotation axis orthogonal to the first rotation axis. When the cutting portion is formed, the cutting member itself is used. The apparatus for manufacturing a composite container according to claim 10, wherein the apparatus rotates about the second rotation axis.   The apparatus for manufacturing a composite container according to any one of claims 9 to 11, further comprising a support portion that supports the container body.   The composite container manufacturing apparatus according to any one of claims 9 to 12, further comprising a rotation restricting unit that restricts rotation of the container body. In a composite container,
A container body having a mouth, a neck, a body, and a bottom,
A plastic member provided in close contact with the outside of the container body,
A composite container, wherein a cut portion penetrating the plastic member is formed at a position of the plastic member corresponding to at least one of the neck and the bottom of the container body.   The composite container according to claim 14, wherein a plurality of the cut portions are formed.   The composite container according to claim 14, wherein the cut portion has an arc shape.   The composite container according to any one of claims 14 to 16, wherein an annular first protrusion is formed on the bottom portion, and the cut portion is formed at a position adjacent to the first protrusion.   The second protrusion according to any one of claims 14 to 17, wherein a second protrusion protruding radially outward is formed on the neck, and the cutout is formed at a position adjacent to the second protrusion. The composite container according to any one of the preceding claims.