JP7365592B2 - Composite container manufacturing method, composite container manufacturing device, and composite container - Google Patents

Description

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

BACKGROUND ART In recent years, bottles made of plastic have become commonplace for storing the liquid contents of foods and drinks, and the liquid contents are housed in such plastic bottles.

A plastic bottle containing such a liquid content 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, a preform containing a single layer material such as PET or PP, a multilayer material, or a blend material is used to form a container shape. However, in conventional biaxial stretch blow molding methods, it is common to simply mold a preform into a container shape. For this reason, when it comes to imparting various functions and properties (barrier properties, heat retention properties, etc.) to the container, the means for doing so, such as changing the material constituting the preform, are limited. In particular, it is difficult to provide different functions and characteristics to different parts of the container (for example, the body and the bottom).

In response, the present applicant has proposed a composite container that can provide various functions and characteristics to the container in Patent Document 1.

Japanese Patent Application Publication No. 2015-128858

Since the plastic members included in the above-described composite container are not welded or bonded to the container body, they 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 its separability from the container body.

The present disclosure has been made in consideration of these points, and provides a method for manufacturing a composite container, a manufacturing device for a composite container, and a manufacturing device for a composite container that can improve the separability of a plastic member provided on the outside of a container body. The purpose is to provide a composite container.

A method for manufacturing a composite container according to one embodiment includes the steps of preparing a preform, providing a plastic member on the outside of the preform, and molding the preform and the plastic member with a blow molding die. By performing blow molding using a mold, the preform and the plastic member are expanded as one, and a container body corresponding to the preform and a plastic member provided in close contact with the outside of the container body are formed. and a step of forming, in the plastic member after blow molding, a cut portion that penetrates the plastic member.

In the method for manufacturing a composite container according to one embodiment, in the step of forming the notch, the notch is located in the plastic member at a position corresponding to at least one of the neck and body of the container body. may be formed.

In the method for manufacturing a composite container according to one embodiment, in the step of forming the notch, the notch may be formed by a cutting member.

In the method for manufacturing a composite container according to one embodiment, in the step of forming the cut portion, the cut portion may be formed by pressing the cutting member against the plastic member.

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

In the method for manufacturing a composite container according to one embodiment, in the step of forming the cut portion, 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 the step of shrinking the plastic member around the cut by heating the plastic member around the cut.

In the method for manufacturing a composite container according to one embodiment, the cut portion may extend linearly, and the height of the cut portion may be 7.0 mm or more and 30.0 mm or less.

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

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, the cut portion may have a V-shape, a U-shape, an L-shape, a T-shape, an X-shape, or a cross-shape.

In the method for manufacturing a composite container according to one embodiment, a protrusion projecting radially outward is formed on the neck of the container body, and in the step of forming the notch, the notch is formed in the neck of the container body. It may be formed at a position adjacent to the protrusion in the circumferential direction.

In the method for manufacturing a composite container according to one embodiment, in the step of forming the notch, the notch may be formed on both sides of the protrusion in the circumferential direction of the container body.

In the method for manufacturing a composite container according to one embodiment, the cut portion may include a plurality of through holes extending in the vertical direction.

In the method for manufacturing a composite container according to one embodiment, the height of the region where the plurality of through holes are present may be 7.0 mm or more and 30.0 mm or less.

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 disposed on the base part, and a processing part attached to the driving part and forming a cut part penetrating the plastic member in the plastic member. .

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

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

A composite container according to one embodiment includes a container 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 body, A cut portion passing through the plastic member is formed at a position corresponding to at least one of the neck portion and the body portion of the container body.

In the composite container according to one embodiment, the plastic member around the cut portion may be heated and contracted.

In the composite container according to one embodiment, the cut portion may extend linearly, and the height of the cut portion may be 7.0 mm or more and 30.0 mm or less.

In the composite container according to one embodiment, the cut portion may have a linear shape.

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

In the composite container according to one embodiment, the cut portion may have a V-shape, a U-shape, an L-shape, a T-shape, an X-shape, or a cross-shape.

In the composite container according to one embodiment, a protrusion projecting radially outward is formed on the neck of the container body, and the notch is formed at a position adjacent to the protrusion in the circumferential direction of the container body. It's okay if it's done.

In the composite container according to one embodiment, the cut portion may be formed on both sides of the protrusion in the circumferential direction of the container body.

In the composite container according to one embodiment, the cut portion may include a plurality of through holes extending in the vertical direction.

In the composite container according to one embodiment, the height of the region where the plurality of through holes are present may be 7.0 mm or more and 30.0 mm or less.

According to the present disclosure, it is possible to improve the separability of the plastic member provided on the outside of the container body.

FIG. 1 is a partial vertical cross-sectional view of a composite container according to one embodiment. FIG. 2 is a horizontal cross-sectional view (cross-sectional view taken along line II-II in FIG. 1) showing a composite container according to one embodiment. FIG. 3 is a partial vertical cross-sectional view of a composite preform for manufacturing a composite container according to one embodiment. FIG. 4 is a horizontal cross-sectional view (cross-sectional view taken along line IV-IV in FIG. 3) showing a composite preform for manufacturing a composite container according to one embodiment. FIGS. 5(a) to 5(d) are perspective views showing various plastic members. FIG. 6 is a front view showing a composite container manufacturing apparatus for manufacturing a composite container according to an embodiment. FIG. 7 is a plan view showing a composite container manufacturing apparatus for manufacturing a composite container according to an embodiment. FIGS. 8(a) to 8(f) are schematic diagrams illustrating a method for manufacturing a composite container according to one embodiment. FIGS. 9(a) to 9(d) are schematic diagrams illustrating a method for manufacturing a composite container according to one embodiment. FIG. 10 is a front view showing a modification (first modification) of the composite container according to an embodiment. FIG. 11 is a front view showing a modification (second modification) of the composite container according to one embodiment. FIG. 12 is a front view showing a modification (third modification) of the composite container according to one embodiment. FIG. 13 is a front view showing another modification (third modification) of the composite container according to the embodiment. FIG. 14 is a front view showing a modification (fourth modification) of the composite container according to one embodiment. FIG. 15 is a front view showing another modification (fourth modification) of the composite container according to the embodiment. FIG. 16 is a front view showing another modification (fourth modification) of the composite container according to the embodiment. FIG. 17 is a front view showing a modification (fifth modification) of the composite container according to one embodiment. FIG. 18 is a front view showing another modification (fifth modification) of the composite container according to the embodiment. FIG. 19 is a front view showing another modification (fifth modification) of the composite container according to the embodiment. FIG. 20 is a front view showing a modification (sixth modification) of the composite container according to one embodiment. FIG. 21 is a front view showing another modification (sixth modification) of the composite container according to the embodiment. FIG. 22 is a front view showing another modification (sixth modification) of the composite container according to the embodiment. FIG. 23 is a front view showing a modification (seventh modification) of the composite container according to an embodiment. FIG. 24 is a sectional view (cross-sectional view taken along the line XXIV-XXIV in FIG. 23) showing a modification (seventh modification) of the composite container according to one embodiment. FIG. 25A is a sectional view (a sectional view corresponding to FIG. 24) showing another example of a modification (seventh modification) of the composite container according to an embodiment. FIG. 25B is a cross-sectional view for explaining a method for removing a plastic member in another modification (seventh modification) of the composite container according to the embodiment. FIG. 26 is a front view showing a modification (eighth modification) of the composite container according to one embodiment. FIG. 27 is a front view showing another modification (eighth modification) of the composite container according to the embodiment.

Hereinafter, one embodiment will be described with reference to the drawings. 1 to 9 are diagrams showing one embodiment. Each figure shown below is shown schematically. Therefore, the size and shape of each part are appropriately exaggerated to facilitate understanding. Further, it is possible to implement the invention with appropriate changes within the scope of the technical concept. In each figure shown below, the same parts are given the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values such as dimensions and material names of each member described in this specification are examples of embodiments, and are not limited to these, and can be appropriately selected and used. In this specification, terms specifying shapes and geometrical conditions, such as terms such as parallel, perpendicular, and perpendicular, are not only meant strictly, but also include substantially the same state.

Configuration of Composite Container First, the outline of the composite container according to this embodiment will be explained with reference to FIGS. 1 and 2. In this specification, "upper" and "lower" respectively refer to the upper and lower parts of the composite container 10A when it is erected (FIG. 1).

The composite container 10A shown in FIGS. 1 and 2 is manufactured by molding a composite preform 70 (see FIGS. 3 and 4) including a preform 10a and a 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 body by performing biaxial stretch blow molding.

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

Among these, the container body 10 includes a mouth 11, a neck 13 provided below the mouth 11, a body 20 provided below the neck 13, and a bottom 30 provided below the body 20. There is.

On the other hand, the plastic member 40 is thinly stretched and tightly attached to the outer surface of the container body 10, and is attached to the container body 10 in such a manner that it does not easily move or rotate.

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

Among these, the mouth portion 11 has a threaded portion 14 that is screwed onto a cap (not shown), and a flange portion 17 provided below the threaded portion 14. Note that the shape of the mouth portion 11 may be a conventionally known shape. The container body 10 is filled with contents such as a liquid content, and a cap (not shown) is screwed onto the opening 11, thereby producing a composite container 10A containing contents.

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

The body portion 20 includes a first portion 21 having a shape in which the diameter gradually increases from the neck portion 13 side toward the bottom portion 30 side (a shape in which the area gradually increases in horizontal cross section), and a first portion 21 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 quadrangular cylindrical shape or an octagonal cylindrical shape. Alternatively, the second portion 22 of the body 20 may have a cylindrical shape with a horizontal cross section that is not uniform from the top to the bottom. The outer surface of the body 20 may be provided with irregularities such as a vacuum absorption panel or grooves.

On the other hand, the bottom portion 30 has a recess 31 located at the center and a grounding portion 32 provided around the recess 31. Note that 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, a round bottom shape, etc.).

Further, the thickness of the container body 10 in the body portion 20 is not limited to this, but can be made as thin as, for example, about 50 μm or more and 250 μm or less. Furthermore, the weight of the container body 10 is also not limited to this, but can be set to 10 g or more and 20 g or less. By reducing the wall 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 produced by biaxial stretch blow molding a preform 10a (described later) produced by injection molding a synthetic resin material. The material for the container body 10 is preferably a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PC (polycarbonate). The container body 10 may be colored red, blue, yellow, green, brown, black, white, etc., but in consideration of ease of recycling, it is preferably colorless and transparent. Further, the various resins mentioned above may be blended and used. Furthermore, a deposited film such as a diamond-like carbon film or a thin silicon oxide film may be formed on the inner surface of the container body 10 in order to improve the barrier properties of the container.

Further, the container body 10 can also be formed as a multilayer molded bottle having two or more layers. That is, by injection molding, for example, the intermediate layer is made of a resin (intermediate layer) having gas barrier properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), or PEN (polyethylene naphthalate). Alternatively, a multilayer bottle having gas barrier properties may be formed by injection molding a preform 10a consisting of three or more layers and then blow molding. Note that, as the intermediate layer, a resin obtained by blending the various resins mentioned above may be used.

In addition, by mixing an inert gas (nitrogen gas, argon gas) with the melted thermoplastic resin, a foamed preform with a foam cell diameter of 0.5 μm or more and 100 μm or less 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-in, the light-shielding property of the entire container body 10 can be improved.

Such a container body 10 may be, for example, a bottle with a full filling capacity of 100 ml or more and 2000 ml or less. Alternatively, the container body 10 may be a large bottle with a full filling capacity of, for example, 10 L or more and 60 L or less.

Next, the plastic member 40 will be explained. The plastic member 40 (40a) is provided so as to surround the outside of the preform 10a as will be 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 something that

The plastic member 40 is attached to the outer surface of the container body 10 without being adhesively bonded, and is in close contact with the container body 10 so as not to move or rotate. This plastic member 40 is thinly stretched on the outer surface of the container body 10 and covers the container body 10. Further, as shown in FIG. 2, the plastic member 40 is provided over the entire circumferential area of the container body 10 so as to surround it, and has a substantially circular horizontal cross section.

In this case, the plastic member 40 is provided to cover the neck 13, body 20, and bottom 30 of the container body 10, excluding the mouth 11. Thereby, desired functions and characteristics can be imparted to the neck portion 13, body portion 20, and bottom portion 30 of the container body 10.

Note that the plastic member 40 may be provided in the entire area or a partial area of the container body 10 other than the mouth part 11. For example, the plastic member 40 may be provided to cover the entire body 20 and bottom 30 of the container body 10 except for the mouth 11 and neck 13. Alternatively, the plastic member 40 may be provided to cover the body 20 and the bottom 30 of the container body 10, except for the mouth 11, the neck 13, and the center of the bottom 30.

Such a plastic member 40 may be one that does not have the effect of shrinking the preform 10a, or may be one that has the effect of shrinking the preform 10a.

When the plastic member 40 has the effect of contracting with respect to the preform 10a, the plastic member 40 is provided outside the preform 10a, is heated together with the preform 10a, and is biaxially stretched blow molded. obtained by being

Since the plastic member 40 is not welded or bonded to the container body 10, it can be peeled off and removed from the container body 10. By the way, in the present embodiment, as shown in FIG. 1, a notch 45 penetrating the plastic member 40 is formed at a position corresponding to the body 20 of the container body 10 in the plastic member 40. . Thereby, the plastic member 40 can be separated from the cut portion 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 separated even more easily, and the container body 10 can be recycled more easily. In addition, since the notch 45 is formed in the plastic member 40 at a position corresponding to the body 20 of the container body 10, the notch 45 can be made conspicuous, and the user can easily see the notch 45. can be easily recognized.

As shown in FIG. 1, in this embodiment, the notch portion 45 is formed in the first portion 21 of the body portion 20 near the neck portion 13. Moreover, the cut portion 45 is formed in a linear shape. In this case, the cut portion 45 is constituted by a single cut extending linearly along the longitudinal direction of the container body 10. Further, the notch portion 45 is provided apart from the upper end (end portion on the mouth portion 11 side) of the plastic member 40, and terminates midway at a position corresponding to the body portion 20 of the container body 10.

It is preferable that the height H1 (length along the vertical direction) of this notch portion 45 is 7.0 mm or more and 30.0 mm or less. By setting the height H1 of the notch 45 to 7.0 mm or more, the notch 45 can be made to stand out, and the user can easily recognize the notch 45. Further, since the height H1 of the notch 45 is 7.0 mm or more, the user can easily separate and remove the plastic member 40 from the surface of the container body 10 using the notch 45 as a trigger. Furthermore, by setting the height H1 of the notch 45 to 30.0 mm or less, it is possible to prevent the notch 45 from becoming too conspicuous. Therefore, it is possible to prevent the design of the composite container 10A from deteriorating.

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, fluororesin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, Ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6, nylon 6,6, aromatic polyamide, polycarbonate, ethylene polyterephthalate, butylene polyterephthalate, ethylene polynaphthalate, 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, phenolic resin, urea resin, polyethylene oxide, polypropylene oxide , polyacetal, epoxy resin and the like. Among these, it is preferable to use thermoplastic inelastic resins such as polyethylene (PE) such as low density polyethylene (LDPE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). It may also be a blend material, a multilayer structure, or a partially multilayer structure. Furthermore, in addition to the main component resin, various additives may be added to the material of the plastic member 40 as long as its properties are not impaired. Examples of additives include plasticizers, ultraviolet stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, yarn friction reducers, slip agents, mold release agents, and antislip agents. Oxidizing agents, ion exchange agents, color pigments, etc. can be added. In addition, by mixing an inert gas (nitrogen gas, argon gas) with the melted thermoplastic resin, a foamed member having a foam cell diameter of 0.5 μm or more and 100 μm or less can be used to mold this foamed preform. Accordingly, the light-shielding property can be improved.

The plastic member 40 may be made of a material that has a light barrier property that blocks invisible light rays such as ultraviolet rays. In this case, without using a multilayer preform or a preform containing a blend material as the preform 10a, it is possible to enhance the light barrier properties of the composite container 10A and prevent the content liquid from deteriorating due to ultraviolet rays or the like. As such a material, a blend material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered. Alternatively, a foamed member having a foam cell diameter of 0.5 μm or more and 100 μm or less, which is produced by mixing an inert gas (nitrogen gas, argon gas) with a thermoplastic resin melt, may be used.

The plastic member 40 may be made of a material with higher cold retention or heat retention (a material with lower thermal conductivity) than the plastic material constituting 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. This improves the cold retention or heat retention of the composite container 10A. Furthermore, when the user holds the composite container 10A, it is prevented from becoming difficult to hold the composite container 10A due to the grip being too cold or too hot. Possible materials 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 into a resin material containing these resins. The average particle diameter of the hollow particles is preferably 1 μm or more and 200 μm or less, more preferably 5 μm or more and 80 μm or less. In addition, "average particle size" means the volume average particle size, and is measured by a known method using a particle size distribution/particle size distribution measuring device (for example, Nanotrack particle size distribution measuring device, manufactured by Nikkiso Co., Ltd.) can do. The hollow particles may be organic hollow particles made of resin or the like, or inorganic hollow particles made of glass or the like. Hollow particles are preferred. Examples of resins constituting the organic hollow particles include styrene resins such as crosslinked styrene-acrylic resins, (meth)acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluorine resins, polyamide resins, and polyimides. Examples include polycarbonate-based resins, polycarbonate-based resins, and polyether-based resins. In addition, Low Peik HP-1055, Low Peik HP-91, Low Peik OP-84J, Low Peik Ultra, Low Peik SE, Low Peik ST (manufactured by Rohm and Haas Co., Ltd.), Nipole MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782 Commercially available hollow particles such as SX866 (manufactured by JSR Corporation) can also be used. The content of the hollow particles is preferably 0.01 parts by mass or more and 50 parts by mass or less, and 1 part by mass or more and 20 parts by mass or less, based on 100 parts by mass of the resin material contained in the plastic member 40. It is more preferable that there be.

Furthermore, the plastic member 40 may be made of a material that is less slippery than the plastic material that constitutes the container body 10 (preform 10a). In this case, the composite container 10A can be easily held by the user without changing the material of the container body 10.

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

Further, 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 explained with reference to FIGS. 3 and 4.

As shown in FIGS. 3 and 4, 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. Among 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. Further, the body portion 20a corresponds to the neck portion 13 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 glued, and is in close contact with the preform 10a so that it does not move or rotate, or is in close contact with the preform 10a to the extent that it does not fall under its own weight. . The plastic member 40a is provided over the entire circumferential area of the preform 10a 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 area of the body 20a and the entire area of the bottom 30a of the preform 10a.

Note that the plastic member 40a may be provided in the entire area or a part of the area other than the mouth portion 11a. Alternatively, the plastic member 40a may be provided to cover the body portion 20a except for the bottom portion 30.

Such a plastic member 40a may be one that does not have the effect of shrinking the preform 10a, or may be one that has the effect of shrinking the preform 10a.

When the plastic member 40a has the function of shrinking, the plastic member 40a is, for example, one that shrinks (e.g., heat shrinks) with respect to the preform 10a when an external action (e.g., heat) is applied. It's okay to be beaten. Alternatively, the plastic member 40a itself may have shrinkage or elasticity and may be able to contract without applying any external action.

In addition, when the plastic member 40a has a heat-shrinking effect, after fitting the cylindrical plastic member 40a into the preform 10a, the lower end of the plastic member 40a (the end opposite to the opening 11a) The margin portion formed in the above may be thermocompression bonded.

Examples of the plastic member 40a include a direct blow tube manufactured by direct blow molding, a sheet molded tube manufactured by sheet molding, an extruded tube manufactured by extrusion molding, an injection molded tube manufactured by injection molding, and an inflation molded tube. Although an inflation molded tube produced by the above method can be used, the present invention is not limited to this, and molding methods other than those described above may also be used.

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

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

As shown in FIG. 5(a), the plastic member 40a has a cylindrical shape with a bottom as a whole, and may include a cylindrical body 41 and a bottom 42 connected to the body 41. . In this case, since the bottom 42 of the plastic member 40a covers the bottom 30a of the preform 10a, various functions and properties such as barrier properties can be imparted to the bottom 30 in addition to the body 20 of the composite container 10A. Can be done. Examples of such a plastic member 40a include the above-mentioned direct blow tube, sheet molded tube, and injection molded tube.

Further, as shown in FIG. 5(b), the plastic member 40a has a cylindrical shape as a whole (bottomless cylindrical shape), and may have a cylindrical body portion 41. In this case, as the plastic member 40a, for example, the above-mentioned blow tube, extruded tube, inflation molded tube, or sheet molded tube can be used.

Alternatively, as shown in FIGS. 5(c) and 5(d), the plastic member 40a may be manufactured by forming a film into a cylindrical shape and bonding the ends together. In this case, as shown in FIG. 5(c), the plastic member 40a may be configured in a tube shape (bottomless cylindrical shape) having a body portion 41, and as shown in FIG. 5(d), The bottom portion 42 may be bonded together to form a cylindrical shape with a bottom.

Configuration of Composite Container Manufacturing Apparatus Next, the configuration of the composite container manufacturing apparatus 80 according to the present embodiment will be described with reference to FIGS. 6 and 7. This composite container manufacturing apparatus 80 is for forming a cut portion 45 that penetrates the plastic member 40 in a plastic member 40 that is provided in close contact with the outside of the container body 10 .

The composite container manufacturing apparatus 80 includes a base part 81 , a driving part 82 disposed on the base part 81 , and a notch part attached to the driving part 82 and penetrating the plastic member 40 . 45.

Among these, the base portion 81 supports the drive portion 82. In this embodiment, the base portion 81 is supported by a frame assembly 90, which will be described later. Note that the present invention is not limited to this, and the base portion 81 may be placed so as to be in direct contact with the floor surface of the work space. Further, in the illustrated example, the base portion 81 is formed in a substantially rectangular parallelepiped shape. Note that the present invention is not limited to this, and the base portion 81 may be configured by combining flat plate-like members.

The drive unit 82 includes a main body 84 disposed on the base 81, a rod 85 that can move forward and backward with respect to the main body 84 in a predetermined direction (horizontal direction, horizontal direction in FIGS. 6 and 7). have. Further, a processed portion 83 is attached to the tip of the rod 85. The rod 85 is movable in and out of the main body 84, and has an advanced position (see FIGS. 6 and 7) in which it protrudes from the main body 84 in a predetermined direction (to the left in FIG. 6), and a forward position (see FIGS. It is possible to move forward and backward between the retracted position (see FIG. 9(a)).

The drive unit 82 further includes a lever 86 that switches the rod 85 between an advanced position and a retracted position, and is configured so that the rod 85 can be switched between the advanced position and the retracted position by rotating the lever 86. has been done. Note that 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 FIG. 9(a)), air is supplied into the air cylinder (not shown), and the rod 85 assumes the advanced position. On the other hand, when the lever 86 is returned to the initial position, air is discharged from the air cylinder (not shown), and the rod 85 can be configured to take the retracted position. In this case, the amount of protrusion of the rod 85 from the main body 84 when the rod 85 takes the advanced position is equal to the distance between the processed part 83 and the container main body 10 when the rod 85 takes the retracted position. It can be set as appropriate based on the following. In other words, the amount of protrusion of the rod 85 is such that when the rod 85 takes the advanced position, the cutting member 87 of the processed portion 83, which will be described later, penetrates the plastic member 40 and does not damage the container body 10. The protrusion amount can be set to .

The processing section 83 forms a cut section 45 in the plastic member 40. This processing section 83 includes a cutting member 87. This cutting member 87 is a Thomson blade or a Bik blade used for a cutter or a cutting die, a pinnacle blade made by corrosion (etching) processing, a blade sharpened thereto, or another blade made by cutting (engraving blade). It may be. The processing section 83 is configured to form the cut section 45 in the plastic member 40 by pressing the cutting member 87 against the plastic member 40 . In this embodiment, the processing section 83 is configured to form the cut section 45 in the plastic member 40 by pressing the cutting member 87 against the plastic member 40 along the horizontal direction. . This processed portion 83 is in a state in which it is in contact with the plastic member 40 when the rod 85 is in the forward position, and in a state in which the processed portion 83 is not in contact with the plastic member 40 when the rod 85 is in the retracted position. It is designed to be. In this case, the amount of pressing of the cutting member 87 of the processing section 83 against the plastic member 40 is adjusted by the amount of protrusion of the rod 85 mentioned above. In this way, by adjusting the amount of pressure of the cutting member 87 against the plastic member 40, it is possible to prevent the container body 10 from being damaged when the processing section 83 forms the cut portion 45 on the plastic member 40. can be suppressed.

Further, the composite container manufacturing apparatus 80 further includes a support section 88 that supports the container body 10. This support portion 88 is attached to a frame assembly 90, which will be described later. The support portion 88 has an upper support portion 88a that supports the vicinity of the neck portion 13 of the container body 10, and a lower support portion 88b that supports the body portion 20 of the container body 10. As shown in FIG. 7, a recess 88c having a shape corresponding to the shape of the neck 13 of the container main body 10 is formed in the upper support portion 88a, and the neck 13 of the container main body 10 is accommodated in this recess 88c. It looks like this. Further, 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 lower support portion 88b, and the body of the container body 10 is formed within this opening 88d. 20 is housed therein.

Next, an example of the frame assembly 90 that supports the base portion 81 described above will be described.

The frame assembly 90 includes a first support member 91, a height adjustment member 92 disposed on the first support member 91, a holding member 93 disposed on the first support member 91, and a height adjustment member 92. It has a second support member 94 disposed above and a mounting member 95 disposed on the second support member 94.

Among these, the first support member 91 is arranged on the floor surface of the work space. The planar shape of the first support member 91 is not particularly limited, and may be rectangular, U-shaped, or the like. Further, the first support member 91 may be configured from a single member, or may be configured by connecting a plurality of members. Furthermore, a mounting member 96 on which the container body 10 is mounted is attached to the first support member 91. This mounting member 96 is composed of a flat plate-like member. Note that the container body 10 may be placed directly on the floor of the work space.

The height adjusting member 92 is composed of a pair of quadrangular prism-shaped members, and plays the role of adjusting the height of the processing section 83 by adjusting the height of the base section 81. This allows the processing section 83 to form the cut section 45 at any location on the plastic member 40 provided in close contact with the outside of the container body 10.

The holding member 93 is composed of a pair of quadrangular prism-shaped members, and serves to hold the second support member 94 disposed on the height adjustment member 92 and the support portion 88 . In the illustrated example, a second support member 94 is connected to the holding member 93, and a support portion 88 is attached.

The second support member 94 is composed of a pair of quadrangular prism-shaped members, one end of each of which is disposed on the height adjustment member 92, and the other end of each of which is connected to the holding member 93.

The mounting member 95 is composed of a pair of quadrangular prism-shaped members, and is arranged on the second support member 94 so as to extend along the width direction of the second support member 94. The base portion 81 is mounted on this mounting member 95. In this way, the base portion 81 is supported by the frame assembly 90.

In addition, in the frame assembly 90, each of the above-mentioned members may be fixed to each other with bolts or the like.

Method for manufacturing composite container Next, a method for manufacturing composite container 10A according to the present embodiment will be described with reference to FIGS. 8(a) to (f) and FIGS. 9(a) to (d).

First, a preform 10a made of plastic material is prepared (see FIG. 8(a)). In this case, the preform 10a may be manufactured by an injection molding method using, for example, an injection molding machine (not shown). Furthermore, a commonly used preform may be used as the preform 10a.

Next, by providing a plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a tightly attached to the outside of the preform 10a is produced (see FIG. 8). b)). In this case, the plastic member 40a has a cylindrical shape with a bottom 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 so as to be brought into close contact with the outer surface of the preform 10a. Alternatively, as will be described later, 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. to cause the heat-shrinkable plastic member 40a to be heat-shrinkable, so that the outer surface of the preform 10a is It may be placed in close contact with.

In this way, by making the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a in advance, a series of steps for manufacturing the composite preform 70 (FIGS. 8(a) to (b) )) and a series of blow molding steps (FIGS. 8(c) to 8(f)) can be performed at separate locations (factories, etc.).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 8(c)). At this time, the composite preform 70 is heated uniformly 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.

Also, a blow molding die 50 is prepared. Then, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 for producing the composite container 10A (see FIG. 8(d)).

The container body 10 and the plastic member 40 provided in close contact with the outside of the container body 10 are molded using this blow molding mold 50. In this case, the blow molding mold 50 includes a mold body 52 that is a metal mold or a resin mold, and 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 Figure 8(d)). The inner surface of the mold body 52 has a shape corresponding to the neck 13, body 20, and bottom 30 of the composite container 10A. In FIG. 8(d), 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. 8(e), after the bottom mold 50c is lowered, the pair of body molds 50a, 50b are closed, and the pair of body molds 50a, 50b and the bottom of the mold body 52 are closed. The mold 50c constitutes a sealed blow molding mold 50. Next, air is forced into the preform 10a, and the composite preform 70 is subjected to biaxial stretch blow molding.

Thereby, the composite preform 70 is shaped 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 within 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, within the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded as one. Thereby, the preform 10a and the plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50.

In this way, the 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. 8(f), the pair of body molds 50a, 50b and bottom mold 50c of the mold body 52 are separated from each other, and the container body 10 and the container body 10 are separated from each other from within the blow molding mold 50. The plastic member 40 provided in close contact with the outside is taken out.

Next, a cut portion 45 that penetrates the plastic member 40 is formed in the plastic member 40 after blow molding. At this time, first, the composite container manufacturing apparatus 80 is prepared. Next, as shown in FIG. 9(a), the container body 10 is attached to the support part 88 of the composite container manufacturing apparatus 80. At this time, the neck portion 13 of the container body 10 is accommodated in the recess 88c (see FIG. 7) of the upper support portion 88a, and the second portion 22 of the body portion 20 of the container body 10 is accommodated in the opening 88d (see FIG. 7) of the lower support portion 88b. (see Figure 7). Note that in this case, the lever 86 of the drive section 82 is at the initial position, and the rod 85 of the drive section 82 is retracted into the main body section 84.

Next, the user rotates the lever 86 from the initial position. As a result, as shown in FIG. 9(b), the rod 85 protrudes from the main body 84 of the drive portion 82 in a predetermined direction (to the left in FIG. 9(b)), and the rod 85 assumes the advancing position. As a result, the cutting member 87 of the processing section 83 is pressed against the plastic member 40 at a position corresponding to the body 20 of the container body 10. In this way, the cutting member 87 forms the notch 45 in the plastic member 40 at a position corresponding to the body 20 of the container body 10. In this way, by forming the notch 45 in the plastic member 40 at a position corresponding to the body 20 of the container body 10, the notch 45 can be made conspicuous, and the user can easily see the notch 45. can be easily recognized.

Next, the user rotates the lever 86 to return the lever 86 to its initial position. As a result, the rod 85 is drawn into the main body part 84 of the drive part 82, as shown in FIG. 9(c).

Then, the user removes the composite container 10A from the support section 88 of the composite container manufacturing apparatus 80. In this way, a composite container 10A is obtained as shown in FIG. 9(d).

Thereafter, the contents are filled into the container body 10 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 using the notch 45 as a starting point. Therefore, in the composite container 10A, the plastic member 40 can be easily separated.

As explained above, according to the present embodiment, the cut portion 45 that penetrates the plastic member 40 is formed in the plastic member 40 after blow molding. Thereby, the cut portion 45 can be easily formed at a desired position of the composite container 10A. Therefore, the plastic member 40 can be easily separated and removed from the container body 10. In addition, by forming a notch 45 penetrating the plastic member 40 after blow molding, it is possible to control the amount of push of the plastic member 40a into the preform 10a and the heat of the plastic member 40a. The cut portion 45 can be formed in a desired shape without considering the amount of shrinkage or the like. Therefore, the notches 45 can be easily formed, and the productivity of the composite container 10A can be improved.

Furthermore, according to the present embodiment, the plastic member 40 can be separated and removed from the container body 10, so the colorless and transparent container body 10 can be recycled as in the past.

Further, according to the present embodiment, the cut portion 45 is formed in the plastic member 40 at a position corresponding to the body portion 20 of the container body 10. Thereby, the notch 45 can be made conspicuous, and the user can easily recognize the notch 45.

Further, according to this embodiment, the cut portion 45 is formed by the cutting member 87. Thereby, the cut portion 45 having a desired shape can be easily formed.

Further, according to the present embodiment, the cut portion 45 is formed by pressing the cutting member 87 against the plastic member 40. In this case, by adjusting the amount of pressing of the cutting member 87 against the plastic member 40, the cut portion 45 that penetrates only the plastic member 40 can be easily made without damaging the container body 10. can be formed.

Further, according to the present embodiment, the composite container manufacturing apparatus 80 includes a base portion 81 , a drive portion 82 disposed on the base portion 81 , and a drive portion 82 that is attached to the drive portion 82 and is attached to the plastic member 40 . , and a processed portion 83 that forms a cut portion 45 that penetrates the plastic member 40. Thereby, by driving the processing section 83 by the driving section 82, the cut section 45 can be easily formed in the plastic member 40.

Further, according to the present embodiment, the composite container manufacturing apparatus 80 further includes a support section 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. Therefore, the notches 45 can be easily formed, and the productivity of the composite container 10A can be improved.

Modifications Next, each modification of the composite container according to this embodiment will be described with reference to FIGS. 10 to 27. The modified examples shown in FIGS. 10 to 27 are different in the position where the notch 45 is formed, the shape of the notch, etc., and the other configurations are approximately the same as the embodiment shown in FIGS. 1 to 9. It is. In FIGS. 10 to 27, the same parts as in FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description thereof will be omitted.

(First modification)
In the embodiment described above, an example has been described in which the notch portion 45 is formed in the vicinity of the neck portion 13 in the first portion 21 of the body portion 20. However, it is not limited to this. The cut portion 45 may be formed at any location; for example, as shown in FIG. 10, the cut portion 45 may be formed in the second portion 22 of the body portion 20 near the bottom portion 30. Further, although not shown, a notch 45 may be formed in the plastic member 40 at a position corresponding to the neck 13 of the container body 10.

(Second modification)
In the embodiment described above, after forming the linear cut portion 45, the plastic member 40 around the cut portion 45 may be contracted by heating the plastic member 40 around the cut portion 45. In this case, the plastic member 40 around the notch 45 may be heated using hot air from a heat gun or the like. As for the heating method, in addition to hot air from a heat gun or hair dryer, steam, a heated jig, or a laser may be used. In the case of steam, it is also possible to use a shrink tunnel when attaching a shrink label. Further, when heating the plastic member 40 around the notch 45, the area around the notch 45 may be heated to such an extent that the container is not deformed. Furthermore, by heating the plastic member 40 around the notch 45, the plastic member 40 around the notch 45 contracts, as shown in FIG. is formed. In the example shown in FIG. 11, the outline of the cut portion 45 has an arcuate shape that is concave in a direction that separates from each other when viewed from the front. Thereby, when the plastic member 40 is separated from the container body 10, tears can easily occur at the upper and lower ends of the notch 45. Therefore, a tear is created at the upper end or the lower end of the notch 45, and the plastic member 40 can be easily separated and removed from the container body 10 using this tear as a tear line. Note that when the plastic member 40 around the notch 45 is contracted by heating the plastic member 40 around the notch 45, the plastic member 40 used has a shrinking function. Also in this case, the notch portion 45 may be formed in the second portion 22 of the body portion 20 near the bottom portion 30.

(Third modification)
In the embodiment described above, an example in which the cut portion 45 has a linear shape has been described. However, the present invention is not limited to this, and the cut portion 45 may have an arc shape, as shown in FIGS. 12 and 13. In this case, for example, as shown in FIG. 12, the notch 45 may be formed in the first portion 21 of the trunk 20 near the neck 13, and as shown in FIG. , may be formed near the bottom portion 30 of the second portion 22 of the body portion 20. Further, for example, as shown in FIGS. 12 and 13, a plurality of notches 45 may be formed. In the example shown in FIGS. 12 and 13, two notches 45 are formed, and these notches 45 have an arcuate shape recessed in directions facing each other. At this time, by using the cutting member 87 including an arc-shaped blade, it is possible to form the cut portion 45 having an arc shape. Further, the plurality of notches 45 may be formed by a plurality of cutting members 87. Thereby, the process of forming the cut portion 45 can be facilitated. Note that a plurality of cut portions 45 may be formed by pressing a single cutting member 87 against the plastic member 40 multiple times.

Also in this case, as described above, after the cut portion 45 is formed, the plastic member 40 around the cut portion 45 may be contracted by heating the cut portion 45. In this case, by contracting the plastic member 40 around the notches 45, the portions between the plurality of notches 45 can be raised relative to the container body 10. This makes it easier for the user to pinch the portion between the plurality of notches 45, allowing the plastic member 40 to be easily separated and removed from the container body 10.

(Fourth modification)
Moreover, as shown in FIG. 14, the cut portion 45 may have a V-shape. The notch 45 according to this modification is formed such that the tip (apex) of the V-shape faces downward. In the illustrated example, the notch 45 is formed in the plastic member 40 at a position corresponding to the neck 13 of the container body 10. By the way, in the composite container 10A, the diameter of the neck portion 13 of the container body 10 is smaller than that of the body portion 20 of the container body. That is, the neck portion 13 of the container body 10 becomes a portion where the stretching ratio in the circumferential direction is smaller than that of the body portion 20 of the container body when the preform 10a and the plastic member 40a are expanded as a unit by blow molding. . As a result, the portion of the plastic member 40 corresponding to the neck portion 13 of the container body 10 is thicker than the portion corresponding to the body portion 20 of the container body 10. Therefore, by forming a V-shaped notch 45 in the plastic member 40 at a position corresponding to the neck 13 of the container body 10, the thick plastic member 40 can be easily cut using the notch 45 as a trigger. The plastic member 40 can be easily separated and removed from the container body 10. Note that the cut portion 45 may be formed in the plastic member 40 at a position corresponding to the body portion 20 of the container body 10.

Further, although not shown, the cut portion 45 may have a shape obtained by rotating the cut portion 45 shown in FIG. 14 by an arbitrary angle with respect to the central axis of the composite container 10A around a predetermined point. For example, the notch portion 45 may be formed such that the tip (apex) of the V-shape faces upward. Furthermore, as shown in FIG. 15, the cut portion 45 may have a U-shape. When the notch 45 has a V-shape or a U-shape, the height H1 of the notch 45 can be approximately 5 mm or more and 20 mm or less, and the width W1 (length along the circumferential direction) of the notch 45 can be about 3 mm or more and 20 mm or less.

Also in this case, as described above, after the cut portion 45 is formed, the plastic member 40 around the cut portion 45 may be contracted by heating the cut portion 45. In this case, as shown in FIG. 16, the plastic member 40 around the notch 45 contracts, forming an opening 46 through which the neck 13 of the container body 10 is exposed. Further, as shown in FIG. 16, a peeling tab X is formed in which the plastic member 40 between the notches 45 is curled. This peeling tab X is formed in a substantially triangular shape and is curled upward and toward the outside of the container body 10. By pulling the peeling tab X while holding it, the plastic member 40 can be easily separated and removed from the container body 10. Thereby, in the composite container 10A, the plastic member 40 can be separated even more easily, and the container body 10 can be recycled more easily.

(Fifth modification)
Moreover, as shown in FIG. 17, the cut portion 45 may have an L-shape. The cut portion 45 according to this modification has a shape that is an L-shape inverted vertically. Further, it is preferable that the cut portion 45 is formed at a position corresponding to a portion of the plastic member 40 other than the portion where the container body 10 has the largest diameter (for example, the second portion 22 of the body portion 20). . As a result, even if, for example, the composite container 10A comes into contact with another composite container 10A, packaging material, etc. when shipping the composite container 10A, the notch 45 will not touch the other composite container 10A, packaging material, etc. Contact can be suppressed. Therefore, peeling of the plastic member 40 from the notch 45 can be suppressed. In the illustrated example, the notch 45 is formed in the plastic member 40 at a position corresponding to the first portion 21 of the body 20 of the container body 10. Note that the notch portion 45 may be formed in the plastic member 40 at a position corresponding to the neck portion 13 of the container body 10, or in the second portion of the body portion 20 of the container body 10 in the plastic member 40. It may be formed at a position corresponding to 22.

Further, although not shown, the cut portion 45 may have a shape obtained by rotating the cut portion 45 shown in FIG. 17 by an arbitrary angle about a predetermined point with respect to the central axis of the composite container 10A. Furthermore, as shown in FIG. 18, the cut portion 45 may have a T-shape. When the notch 45 has an L-shape or a T-shape, the height H1 of the notch 45 can be approximately 4 mm or more and 15 mm or less, and the width W1 of the notch 45 can be approximately 4 mm or more and 15 mm or less. be able to.

Also in this case, as described above, after the cut portion 45 is formed, the plastic member 40 around the cut portion 45 may be contracted by heating the cut portion 45. In this case, as shown in FIG. 19, the plastic member 40 around the notch 45 contracts, forming an opening 46 through which the first portion 21 of the body 20 of the container body 10 is exposed. Also in this case, as shown in FIG. 19, a peeling tab X is formed in which the plastic member 40 between the notches 45 is curled. This peeling tab X is formed in a substantially triangular shape and is curled downward and toward the outside of the container body 10. By pulling the peeling tab X while holding it, the plastic member 40 can be easily separated and removed from the container body 10.

(Sixth modification)
Moreover, as shown in FIG. 20, the cut portion 45 may have an X-shape. In the illustrated example, the notch 45 is formed in the plastic member 40 at a position corresponding to the neck 13 of the container body 10. Thereby, the thick plastic member 40 can be easily broken using the cut portion 45, and the plastic member 40 can be easily separated and removed from the container body 10. Note that the cut portion 45 may be formed in the plastic member 40 at a position corresponding to the body portion 20 of the container body 10.

Although not shown, the cut portion 45 may have a shape obtained by rotating the cut portion 45 shown in FIG. 21 by an arbitrary angle with respect to the central axis of the composite container 10A around a predetermined point. Furthermore, as shown in FIG. 21, the cut portion 45 may have a cross shape. When the notch 45 has an X-shape or a cross shape, the height H1 of the notch 45 can be approximately 4 mm or more and 15 mm or less, and the width W1 of the notch 45 can be approximately 4 mm or more and 15 mm or less. Can be done.

Also in this case, as described above, after the cut portion 45 is formed, the plastic member 40 around the cut portion 45 may be contracted by heating the cut portion 45. In this case, as shown in FIG. 22, the plastic member 40 around the notch 45 contracts, forming an opening 46 through which the neck 13 of the container body 10 is exposed. Also in this case, as shown in FIG. 22, a peeling tab X is formed in which the plastic member 40 between the notches 45 is curled. In this modification, four peeling tabs X are formed. Each peeling tab X is formed in a substantially triangular shape, and is curled toward the outside of the container body 10. By pulling the peeling tab X while holding it, the plastic member 40 can be easily separated and removed from the container body 10.

(Seventh modification)
Further, as shown in FIGS. 23 and 24, a protrusion 131 that protrudes radially outward is formed on the neck 13 of the container body 10, and a notch 45 is formed on the protrusion 131 in the circumferential direction of the container body 10. They may be formed at adjacent positions. In this case, the protrusion 131 extends in the vertical direction and includes a base end 131a and a tip end 131b. Further, the height H2 (the maximum amount of protrusion in the radial direction) of the protrusion 131 can be approximately 0.5 mm or more and 2.5 mm or less. In addition, in FIG. 24, the outer surface of the neck portion 13 in the case where the protrusion portion 131 is not formed is shown by a two-dot chain line (imaginary line).

Further, the width W2 (length along the circumferential direction) of the protrusion 131 at the central position in the height direction of the protrusion 131 can be approximately 0.3 mm or more and 2.5 mm or less. Such protrusions 131 are formed during 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 recess 132 corresponding to the protrusion 131 is formed on the inner surface of the neck 13 of the container body 10. Note that the protrusion 131 may be formed along the parting line of the pair of body molds 50a and 50b of the blow molding mold 50.

In this modification, one notch 45 is formed on each side of the protrusion 131 in the circumferential direction of the container body 10. The two notches 45 are formed apart from the protrusion 131, respectively.

When forming such a cut portion 45, first, as explained using FIG. 8, biaxial stretch blow molding is performed on the composite preform 70. At this time, a protrusion 131 is formed on the neck 13 of the container body 10. Next, as explained using FIG. 9, the cut portion 45 is formed by the composite container manufacturing apparatus 80. At this time, the notch 45 is formed at a position adjacent to the protrusion 131 in the circumferential direction of the container body 10. Further, the notches 45 are formed on both sides of the protrusion 131 in the circumferential direction of the container body 10. In this way, a composite container 10A shown in FIG. 23 is obtained.

As described above, according to this modification, the protrusion 131 that protrudes radially outward is formed on the neck 13 of the container body 10, and the notch 45 is formed in the neck 13 of the container body 10 in the circumferential direction of the protrusion 131. It is formed in a position adjacent to. Therefore, by hooking the tip of the user's toe on the protrusion 131, the plastic member 40 can be easily broken using the notch 45 as a trigger. As a result, the plastic member 40 is easily peeled off from the neck 13 of the container body 10. Therefore, the plastic member 40 can be easily separated and removed from the container body 10.

Further, according to this modification, the cut portions 45 are formed on both sides of the projection portion 131 in the circumferential direction of the container body 10. Thereby, the plastic member 40 between the notches 45 can be easily pinched. That is, when the user hooks the tip of the user's toe on the projection 131, the plastic member 40 between the notches 45 is easily peeled off from the container body 10. This allows the user to easily pinch the plastic member 40 between the notches 45 that has been torn off from the container body 10, and to easily separate and remove the plastic member 40 from the container body 10. Can be done.

Note that, as shown in FIG. 25A, the notch 45 may be formed only on one side of the protrusion 131 in the circumferential direction of the container body 10. In this case, it is preferable that the cut portion 45 extends to reach the base end portion 131a of the projection portion 131. In this case, as shown in FIG. 25B, the part of the plastic member 40 that has been peeled off from the neck 13 of the container body 10 extends along the protrusion 131 to form a peeling piece P. Further, a gap G is formed between the peelable piece P and the neck portion 13. Therefore, the user can easily pick up the peelable piece P. As a result, the plastic member 40 can be easily separated and removed from the container body 10.

(Eighth modification)
Further, as shown in FIGS. 26 and 27, the cut portion 45 may include a plurality of through holes 47 extending in the vertical direction. In this case, for example, as shown in FIG. 26, the notch 45 may be formed in the first portion 21 of the trunk 20 near the neck 13, and as shown in FIG. , may be formed near the bottom portion 30 of the second portion 22 of the body portion 20. Such a notch 45 can be formed, for example, by using a cutting member in the shape of a sword pin including a large number of blades. Further, in this case, the height H3 (length along the vertical direction) of the region where the plurality of through holes 47 are present may be 7.0 mm or more and 30.0 mm or less. By setting the height H2 of the area where the plurality of through-holes 47 is 7.0 mm or more, the plurality of through-holes 47 can be made to stand out, and the user can easily recognize the notch 45. . Furthermore, since the height H3 of the region where the plurality of through holes 47 exists is 7.0 mm or more, the user can easily separate the plastic member 40 from the surface of the container body 10 using the notch 45 as a trigger. Can be removed. Further, by setting the height H3 of the region where the plurality of through holes 47 is 30.0 mm or less, it is possible to suppress the plurality of through holes 47 from becoming too conspicuous. Therefore, it is possible to prevent the design of the composite container 10A from deteriorating.

Further, in the above embodiment, an example in which the cut portion 45 is formed by pressing the cutting member 87 against the plastic member 40 has been described. That is, an example has been described in which the cut portion 45 is formed by pressing the cutting member 87 against the plastic member 40 along the horizontal direction. However, the present invention is not limited to this, and the cut portion 45 may be formed by moving the cutting member 87 in the vertical direction with respect to the plastic member 40.

Further, in the embodiment described above, the container main body 10 includes 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. An example including 30 has been described. However, the present invention is not limited to this, and although not shown, the container body 10 has a shape that is located between the neck 13 and the body 20 and whose diameter gradually increases from the neck 13 side to the body 20 side. A shoulder portion 12 may be provided.

Further, in the embodiment described above, 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 body portion 20 is provided as a whole. An example in which the second portion 22 has a substantially uniform diameter has been described. However, the present invention is not limited to this, and the body portion 20 may have a cylindrical shape having a substantially uniform diameter as a whole.

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

It is also possible to appropriately combine the plurality of components disclosed in the above embodiments and modifications as necessary. Alternatively, some components may be deleted from all the components shown in the above embodiments and modifications.

10 Container body 10A Composite container 10a Preform 11 Mouth part 20 Body part 30 Bottom part 40, 40a Plastic member 45 Notch part 47 Through hole 50 Blow molding mold 80 Manufacturing device for composite container 81 Base part 82 Drive part 83 Processing part 87 Cutting member 88 Support part

Claims (3)

A composite container manufacturing apparatus for manufacturing a composite container comprising a container body and a plastic member provided in close contact with the outside of the container body,
The base part and
a driving section disposed on the base section;
a processing section that is attached to the drive section and forms a cut section that penetrates the plastic member in the plastic member ;
The container body includes a mouth and a neck provided below the mouth,
A protrusion that protrudes radially outward is formed on the neck of the container body,
The manufacturing device for a composite container, wherein the processing section forms the cut section so as to reach a base end of the protrusion . The composite container manufacturing apparatus according to claim 1, wherein the processing section includes a cutting member. The composite container manufacturing device according to claim 1 or 2, further comprising a support portion that supports the container body.