JP6850443B2 - Composite containers and their manufacturing methods, composite preforms, and plastic components - Google Patents

Description

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

Recently, plastic bottles have become common as bottles for containing the contents of foods and drinks, and such plastic bottles contain the contents.

A plastic bottle containing such a content liquid is manufactured by inserting a preform into a mold and biaxially stretching blow molding.

By the way, in the conventional biaxial stretching blow molding method, a container shape is formed by using a preform containing, for example, a single layer material such as PET or PP, a multilayer material or a blend material. However, in the conventional biaxial stretching blow molding method, it is general that the preform is simply molded into a container shape. Therefore, when the container is to have various functions and properties (barrier property, heat retention property, etc.), the means thereof is limited, for example, changing the material constituting the preform. In particular, it is difficult to give different functions and characteristics depending on the part of the container (for example, the body and the bottom).

Japanese Unexamined Patent Publication No. 2009-241526

The present invention has been made in consideration of such a point, and a composite container and a manufacturing method thereof, a composite preform, and a plastic member capable of imparting various functions and characteristics to the container can be provided. The purpose is to provide.

In the present invention, in the method for manufacturing a composite container, a step of preparing a preform made of a plastic material, a step of providing a plastic member on the outside of the preform, and heating the preform and the plastic member by near infrared rays. By performing blow molding on the preform and the plastic member in the blow molding mold and the step of inserting the preform and the plastic member into the blow molding mold, the preform and the plastic member are integrally expanded. It is a method for manufacturing a composite container, which comprises a step of making the plastic member to have a near-infrared transmittance of 50% or more.

The present invention relates to a method for manufacturing a composite container.
The process of preparing a preform made of plastic material and
By providing an inner label member so as to surround the outer side of the preform and providing a plastic member on the outside of the inner label member, the preform and the inner label member adhered to the outer side of the preform are brought into close contact with each other. And a step of producing a composite preform having the plastic member provided in close contact with the outside of the inner label member.
A step of heating the composite preform with near infrared rays and inserting it into a blow molding die, and
A step of integrally expanding the preform, the inner label member, and the plastic member of the composite preform by performing blow molding on the composite preform in the blow molding mold is provided.
This is a method for manufacturing a composite container, characterized in that the near-infrared transmittance of the plastic member is 50% or more.

The present invention is a composite container characterized by being obtained by the above method.

The present invention is used in composite preforms.
Preform made of plastic material and
It is provided with a plastic member provided so as to surround the outside of the preform.
The plastic member is in close contact with the outside of the preform.
It is a composite preform characterized by having a near-infrared transmittance of 50% or more of the plastic member.

The present invention has the preform and a plastic member that is in close contact with the outside of the preform by being mounted so as to surround the outside of the preform and being integrally heated by the near infrared rays together with the preform. A plastic member for making a composite container,
It is a plastic member having a tubular body portion that covers at least the body portion of the preform and having a near-infrared transmittance of 50% or more.

The present invention is mounted so as to surround the outside of the preform and is mounted inside the plastic member, and is heated by near infrared rays together with the preform and the plastic member to obtain the preform and the preform. An inner label member for producing a composite preform having an inner label member adhered to the outside of the preform and the plastic member adhered to the outside of the inner label member.
It is an inner label member having a tubular body portion that covers the body portion of the preform and having a near-infrared transmittance of 50% or more.

According to the present invention, the composite preform and the plastic member are integrally expanded by performing blow molding on the composite preform in the blow molding mold. Therefore, the preform (container body) and the plastic member can be composed of separate members, and various functions and characteristics can be imparted to the composite container by appropriately selecting the type and shape of the plastic member. it can. Further, the near-infrared transmittance of the plastic member included in the composite preform and the internal label member provided if desired is 50% or more. Therefore, when the composite preform is heated by near-infrared rays before blow molding, most of the near-infrared rays pass through the plastic member and reach the preform. As a result, the preform can be heated efficiently.

FIG. 1 is a partial vertical sectional view showing a composite container according to the first embodiment of the present invention. FIG. 2 is a horizontal sectional view (FIG. II-II sectional view of FIG. 1) showing a composite container according to the first embodiment of the present invention. FIG. 3 is a vertical sectional view showing a composite preform according to the first embodiment of the present invention. 4 (a) to 4 (d) are perspective views showing various plastic members. 5 (a) to 5 (f) are schematic views showing a blow molding method according to the first embodiment of the present invention. 6 (a) to 6 (f) are schematic views showing a blow molding method according to a modified example of the first embodiment of the present invention. 7 (a) to 7 (g) are schematic views showing a blow molding method according to a modified example of the first embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a modified example of the composite container according to the first embodiment of the present invention. FIG. 9 is a vertical sectional view showing a modified example of the composite preform according to the first embodiment of the present invention. 10 (a) to 10 (f) are schematic views showing a modified example of the blow molding method according to the first embodiment of the present invention. FIG. 11 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 12 is a horizontal sectional view (XII-XII line sectional view of FIG. 11) showing a composite container according to a second embodiment of the present invention. FIG. 13 is a vertical sectional view showing a composite preform according to the second embodiment of the present invention. 14 (a) to 14 (d) are perspective views showing various inner label members and various plastic members. 15 (a) to 15 (f) are schematic views showing a blow molding method according to a second embodiment of the present invention. 16 (a) to 16 (f) are schematic views showing a blow molding method according to a modified example of the second embodiment of the present invention. 17 (a) to 17 (g) are schematic views showing a blow molding method according to a modified example of the second embodiment of the present invention. FIG. 18 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention. FIG. 19 is a vertical sectional view showing a modified example of the composite preform according to the second embodiment of the present invention. 20 (a) to 20 (f) are schematic views showing a modified example of the blow molding method according to the second embodiment of the present invention.

First Embodiment Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. 1 to 10 are diagrams showing the first embodiment of the present invention.

First, the outline of the composite container produced by the blow molding method according to the present embodiment will be described with reference to FIGS. 1 and 2. In addition, in this specification, "upper" and "lower" mean the upper part and the lower part in the state (FIG. 1) in which the composite container 10A is upright, respectively.

As will be described later, the composite container 10A shown in FIGS. 1 and 2 is biaxially stretched with respect to the composite preform 70 (see FIG. 3) including the preform 10a and the plastic member 40a using a blow molding die 50. It is obtained by integrally expanding the preform 10a of the composite preform 70 and the plastic member 40a by performing blow molding.

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

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

On the other hand, the plastic member 40 is in close contact with the outer surface of the container body 10 in a thinly extended state, and is attached to the container body 10 in a state where it does not easily move or rotate.

Next, the container body 10 will be described in detail. As described above, the container body 10 has a mouth portion 11, a neck portion 13, a shoulder portion 12, a body portion 20, and a bottom portion 30.

Of these, the mouth portion 11 has a screw portion 14 screwed to a cap (not shown) and a flange portion 17 provided below the screw portion 14. The shape of the mouth portion 11 may be a conventionally known shape.

The neck portion 13 is located between the flange portion 17 and the shoulder portion 12, and has a substantially cylindrical shape having a substantially uniform diameter. Further, the shoulder portion 12 is located between the neck portion 13 and the body portion 20, and has a shape in which the diameter gradually increases from the neck portion 13 side to the body portion 20 side.

Further, the body portion 20 has a cylindrical shape having a substantially uniform diameter as a whole. However, the present invention is not limited to this, and the body portion 20 may have a polygonal tubular shape such as a quadrangular tubular shape or an octagonal tubular shape. Alternatively, the body portion 20 may have a tubular shape having a non-uniform horizontal cross section from the upper side to the lower side. Further, in the present embodiment, the body portion 20 is not formed with irregularities and has a substantially flat surface, but the present invention is not limited to this. For example, the body portion 20 may have irregularities such as a panel or a groove.

On the other hand, the bottom portion 30 has a recess 31 located at the center and a ground contact portion 32 provided around the recess 31. The shape of the bottom portion 30 is not particularly limited, and may have a conventionally known bottom shape (for example, a petaloid bottom shape, a round bottom shape, or the like).

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

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

Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foamed preform having a foamed cell diameter of 0.5 to 100 μm is 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 foam cell built-in, it is possible to improve the light-shielding property of the entire container body 10.

Such a container body 10 may consist of, for example, a bottle having a full filling capacity of 100 ml to 2000 ml. Alternatively, the container body 10 may be a large bottle having a full filling capacity of, for example, 10 L to 60 L.

Next, the plastic member 40 will be described. The plastic member 40 (40a) is provided so as to surround the outside of the preform 10a as described later, and is obtained by being brought into close contact with the outside of the preform 10a and then biaxially stretched and blow-molded together with the preform 10a. It is a thing.

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

In this case, the plastic member 40 is provided so as to cover the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, excluding the mouth portion 11 and the neck portion 13. As a result, desired functions and characteristics can be imparted to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10.

The plastic member 40 may be provided in the entire area or a part of the container body 10 other than the mouth portion 11. For example, the plastic member 40 may be provided so as to cover the entire neck portion 13, shoulder portion 12, body portion 20, and bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of the plastic member 40 is not limited to one, and a plurality of plastic members 40 may be provided. For example, two plastic members 40 may be provided on the outer surface of the shoulder portion 12 and the outer surface of the bottom portion 30, respectively.

On the other hand, since the plastic member 40 is not welded or adhered to the container body 10, it can be peeled off from the container body 10 and removed. Specifically, for example, the plastic member 40 may be cut off using a knife or the like, or the plastic member 40 may be provided with a cutting line (not shown in advance) and the plastic member 40 may be peeled off along the cutting line. it can. As a result, the printed plastic member 40 can be separated and removed from the container body 10, so that the colorless and transparent container body 10 can be recycled as in the conventional case.

The plastic member 40a has a near-infrared transmittance of 50% or more, preferably 65% or more, and more preferably 80% or more. Since the near-infrared transmittance of the plastic member 40a is 50% or more, most of the near-infrared rays pass through the plastic member 40a in the near-infrared irradiation of the composite preform before blow molding, so that the preform 10a Can be heated efficiently. In the present specification, the near infrared ray means a light ray having a wavelength of 800 nm to 2500 nm. Further, the near-infrared transmittance of 50% or more means that, for example, when the absorbance of a plastic member 40a is measured using a known spectrophotometer, it is in the near-infrared wavelength region (800 nm to 2500 nm). It means that the transmittance is 50% or more in the entire area. Such a plastic member 40a may not have an action of contracting with respect to the preform 10a, or may have an action of contracting.

When the plastic member 40a has an action of contracting with respect to the preform 10a, the plastic member (outer contraction member) 40a is provided on the outside of the preform 10a and is heated integrally with the preform 10a. It was obtained by biaxial stretching blow molding. The plastic member (outer contraction member) 40a may be any one having an action of contracting with respect to the preform 10a. The plastic member (outer contractile member) 40a itself may have contractility or elasticity and may be contractible without applying an external action. Alternatively, the plastic member (outer shrinking member) 40a may shrink (for example, heat shrinking) with respect to the preform 10a when an external action (for example, heat) is applied.

The thickness of the plastic member 40a is not limited to this, but can be, for example, about 5 μm to 50 μm when attached to the container body 10.

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

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

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

The plastic member 40a is attached to the outer surface of the preform 10a without being adhered to the preform 10a so that it does not move or rotate, or is in close contact with the preform 10a so that it does not fall under 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 area of the body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a.

The plastic member 40a may be provided in the entire area or a part of the area other than the mouth portion 11a. For example, the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a. Further, the number of the plastic members 40a is not limited to one, and a plurality of plastic members 40a may be provided. For example, two plastic members 40a may be provided at two locations on the outer side of the body portion 20a, respectively.

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

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

On the other hand, when the plastic member (outer shrinking member) 40a has an action of contracting, the plastic member (outer shrinking member) 40a is attached to the preform 10a, for example, when an external action (for example, heat) is applied. On the other hand, those that shrink (for example, heat shrink) may be used. Alternatively, the plastic member (outer shrinking member) 40 may itself have shrinkage or elasticity and can shrink without applying an external action.

The plastic member 40a is not particularly limited as long as the near-infrared transmittance of the plastic member 40a can be achieved to be 50% or more, but includes polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, and the like. Examples thereof include resin materials made of, and among these, it is preferable that polyethylene or polypropylene is contained. In addition, a blend of these materials may be included. Further, as long as the characteristics of the plastic member 40a are not impaired, the resin materials include polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, and polychloride. Vinyl, polyvinylidene chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluororesin, methyl polymethacrylate, polyacrylic acid, methyl polyacrylate, polyacrylonitrile, polyacrylamide, polybutadiene, Polybutene-1, polyisoprene, polychloroprene, ethylenepropylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6, nylon 6,6, nylon MXD6, aromatic polyamide, polycarbonate, ethylene polyterephthalate, Butylene polyterephthalate, ethylene polynaphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyetherketone, polyetheretherketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyethersulfone, silicone resin, Polyetherethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin and the like may be added to the above materials. Further, a copolymer in which two or more monomer units constituting the above-mentioned resin are polymerized may be added, or two or more kinds of the above-mentioned resins may be added. Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the resin, a foaming member having a foam cell diameter of 0.5 to 100 μm is used, and by molding this foam preform, light is shielded. You can improve your sex.

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

Further, the plastic member 40a may contain a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, without using a multi-layer preform or a preform containing a blended material as the preform 10a, the gas barrier property of the composite container 10A is enhanced, oxygen intrusion into the container is prevented, and the content liquid is prevented from deteriorating. In addition, it is possible to prevent the evaporation of water vapor from the inside of the container to the outside and prevent the content from being reduced. For example, the plastic member 40 may be provided over the entire area of the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container main body 10 to enhance the gas barrier property of this portion. As such a material, PE (polyethylene), PP (polypropylene), MXD-6 (nylon), EVOH (ethylene vinyl alcohol copolymer) or an oxygen absorber such as a fatty acid salt may be mixed with these materials. Be done.

Further, the plastic member 40a may contain a material having a light barrier property such as ultraviolet rays. In this case, it is possible to enhance the light barrier property of the composite container 10A and prevent the content liquid from being deteriorated by ultraviolet rays or the like without using a multilayer preform or a preform containing a blend material as the preform 10a. For example, the plastic member 40a may be provided over the entire area of the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container main body 10 to enhance the ultraviolet barrier property of this portion. 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 foaming member having a foam cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, may be used.

Further, the plastic member 40a may contain a material (material having low thermal conductivity) having higher heat retention or cold retention 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. As a result, the heat retention or cold retention of the composite container 10A is enhanced. For example, the plastic member 40 may be provided on all or part of the body 20 of the container body 10 to improve the heat retention or cold retention of the body 20. Further, when the user grips the composite container 10A, it is prevented that the composite container 10A becomes difficult to hold due to being too hot or too cold. As such a material, foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. Further, a foaming member having a foam cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, may be used. It is preferable to mix hollow particles with the resin material containing these resins. The average particle size of the hollow particles is preferably 1 to 200 μm, more preferably 5 to 80 μm. The "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. Further, the hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like, but are organic because of their excellent dispersibility. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include a styrene resin such as a crosslinked styrene-acrylic resin, a (meth) acrylic resin such as acrylonitrile-acrylic resin, a phenol resin, a fluorine resin, a polyamide resin, and a polyimide. Examples thereof include based resins, polycarbonate resins, and polyether resins. In addition, Low Pay HP-1055, Low Pay HP-91, Low Pay OP-84J, Low Pay Ultra, Low Pay SE, Low Pay ST (manufactured by Roam and Hearth Co., Ltd.), Nipole MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782 , SX866 (manufactured by JSR Corporation) and other commercially available hollow particles can also be used. The content of the hollow particles is preferably 0.01 to 50 parts by mass, and more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the resin contained in the plastic member 40a.

Further, the plastic member 40a may contain 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. For example, the plastic member 40 may be provided on all or part of the body 20 of the container body 10 to make the body 20 easier to hold.

Further, the plastic member 40a may be designed or printed. In this case, it is possible to display an image or characters on the composite container 10A without separately attaching a label or the like to the container body 10 after blow molding. For example, a plastic member 40 may be provided on all or a part of the body 20 of the container body 10, and an image or characters may be displayed on the body 20. The printing may be formed by designing or printing the plain plastic member 40a by a printing method such as an inkjet method, a gravure printing method, an offset printing method, or a flexographic printing method. For example, when the inkjet method is used, a UV curable ink is applied to the plastic member 40a, UV irradiation is performed on the plastic member 40a, and the ink is cured to form a print layer. This printing may be applied to the plastic member (shrink tube) 40a before being attached to the preform 10a, or may be applied with the plastic member 40a provided on the outside of the preform 10a. Further, printing may be applied to the plastic member 40 of the composite container 10A after blow molding. As the material of the plastic member 40, the same material as that of the container body 10 may be used, or a material different from that of the container body 10 may be used. Further, the plastic member 40a may be colored in a color such as red, blue, yellow, green, brown, black, or white, and may be transparent or opaque.

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

As shown in FIGS. 3 and 4A, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. You may. 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 can be imparted to the bottom portion 30 in addition to the body portion 20 of the composite container 10A. Examples of such a plastic member 40a include the blow tube and the sheet forming tube described above.

Further, as shown in FIGS. 9 (described later) and 4 (b), the plastic member 40a has a circular tube shape (bottomless cylindrical shape) as a whole, and even if it has a cylindrical body portion 41. good. In this case, as the plastic member 40a, for example, the blow tube, extrusion tube, inflation molding tube, and sheet molding tube described above can be used.

Further, as shown in FIGS. 4 (c) and 4 (d), the plastic member 40a may be manufactured by forming a film into a tubular shape and laminating its ends. In this case, as shown in FIG. 4 (c), the plastic member 40a may be formed in a pipe shape (bottomless cylindrical shape) having a body portion 41, and as shown in FIG. 4 (d). It may be formed in a bottomed cylinder shape by sticking the bottom portions 42 together. In this case, as the plastic member 40a, for example, a blow tube, an extrusion tube, an inflation molding tube, or a sheet molding tube can be used.

Next, the blow molding method (manufacturing method of the composite container 10A) according to the present embodiment will be described with reference to FIGS. 5A to 5F.

First, a preform 10a made of a plastic material is prepared (see FIG. 5A). In this case, the preform 10a may be produced by an injection molding method using, for example, an injection molding machine (not shown). Further, as the preform 10a, a preform generally used in the past may be used.

Next, by providing the plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is produced (FIG. 5 (FIG. 5). b) See). In this case, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member 40a is attached so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

In this case, a plastic member 40a having an inner diameter equal to or slightly smaller than the outer diameter of the preform 10a may be pushed 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 heat-shrinked by heating to 50 ° C. to 100 ° C. to shrink the outer surface of the preform 10a. It may be in close contact with.

In this way, a series of steps for producing the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a in advance to prepare the composite preform 70 (FIGS. 5A to 5B). )) And a series of steps (FIGS. 5 (c) to (f)) for producing the composite container 10A by blow molding can be carried out at different places (factory or the like).

Next, the composite preform 70 is heated by the near-infrared heating device 51 (see FIG. 5C). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the near-infrared heating device 51 while rotating with the mouth portion 11a facing downward. The heating time is preferably 8 to 60 seconds, more preferably 10 to 30 seconds. The heating temperature of the preform 10a and the plastic member 40a may be, for example, 90 ° C to 130 ° C.

As described above, since the near-infrared ray transmittance of the plastic member 40a is 50% or more, most of the near-infrared rays emitted from the near-infrared ray heating device 51 pass through the plastic member 40a and preform. Reach 10a. Therefore, the near infrared rays from the near infrared rays heating device 51 are suppressed from being blocked by the plastic member 40a, and the preform 10a can be efficiently heated. Further, since the near-infrared transmittance of the plastic member 40a is 50% or more, the heating condition of the composite preform 70 can be brought close to the heating condition of the normal preform 10a in which the plastic member 40a is not provided. It becomes.

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

The composite container 10A is molded using the blow molding die 50. In this case, the blow molding die 50 includes a pair of body molds 50a and 50b that are separated from each other and a bottom mold 50c (see FIG. 5D). In FIG. 5D, 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.

Next, as shown in FIG. 5 (e), after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the pair of body molds 50a and 50b and the bottom mold 50c are sealed. The blow-molded mold 50 is configured. Next, air is press-fitted into the preform 10a, and biaxial stretch blow molding is performed on the composite preform 70.

As a result, the container body 10 can be 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 shaped into a shape corresponding to the inner surface of the blow molding die 50.

In this way, the composite container 10A including the container body 10 and the plastic member 40 provided on the outer surface of the container body 10 is obtained.

Next, as shown in FIG. 5 (f), the pair of body molds 50a and 50b and the bottom mold 50c are separated from each other, and the composite container 10A is taken out from the blow molding mold 50.

Modification Example of Blow Molding Method Next, a modification of the blow molding method (manufacturing method of the composite container 10A) according to the present embodiment will be described with reference to FIGS. 6A to 6F. In the modified examples shown in FIGS. 6 (a) to 6 (f), the plastic member (outer contracting member) 40a has an action of contracting with respect to the preform 10a, and the other configurations are shown in FIG. 5 (a). It is substantially the same as the form shown in (f). In FIGS. 6A to 6F, the same parts as those in FIGS. 5A to 5F are designated by the same reference numerals, and detailed description thereof will be omitted.

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

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

Next, the preform 10a and the plastic member (outer contraction member) 40a are heated by the near-infrared heating device 51 (see FIG. 6C). At this time, the preform 10a and the plastic member (outer contraction member) 40a are uniformly heated in the circumferential direction by the near-infrared heating device 51 while rotating with the mouth portion 11a facing downward. The heating time is preferably 8 to 60 seconds, more preferably 10 to 30 seconds. The heating temperature of the preform 10a and the plastic member (outer shrinking member) 40a may be, for example, 90 ° C to 130 ° C.

When the plastic member (outer shrinking member) 40a is heated in this way, the plastic member (outer shrinking member) 40a is thermally shrunk and comes into close contact with the outside of the preform 10a (see FIG. 6C). .. When the plastic member (outer shrinking member) 40a itself has shrinkage, the plastic member is provided at the time when the plastic member (outer shrinking member) 40a is provided on the outside of the preform 10a (see FIG. 6B). The (outer shrinking member) 40a may be in close contact with the outside of the preform 10a.

Subsequently, the preform 10a and the plastic member (outer shrinking member) 40a heated by the near-infrared heating device 51 are sent to the blow molding die 50 (see FIG. 6D).

The preform 10a and the plastic member (outer shrinking member) 40a are molded using the blow molding die 50, and together with the container body 10 in substantially the same manner as in the cases of FIGS. 5A to 5F described above. , A composite container 10A provided with a plastic member (outer contraction member) 40 provided on the outer surface of the container body 10 can be obtained (see FIGS. 6 (d) to 6 (f)).

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

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

Next, a plastic member (outer contraction member) 40a is provided on the outside of the preform 10a (see FIG. 7B). In this case, the plastic member (outer contracting member) 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member (outer contracting member) 40 is mounted so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

Next, the preform 10a and the plastic member (outer contraction member) 40a are heated by the heating device 55, which is the first heating device (see FIG. 7C). The heating device 55 may be a device that irradiates near infrared rays or a device that does not irradiate, as long as it can be thermally shrunk by heating at least the plastic member 40a. At this time, the heating temperature of the preform 10a and the plastic member (outer contraction member) 40a may be, for example, 50 ° C to 100 ° C.

When the plastic member (outer shrinking member) 40a is heated, the plastic member (outer shrinking member) 40a is heat-shrinked and comes into close contact with the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and a plastic member (outer shrinking member) 40a in close contact with the outside of the preform 10a can be obtained (see FIG. 7C).

In this way, the composite preform 70 is produced by heat-adhering the plastic member (outer contraction member) 40a to the outside of the preform 10a in advance using the first heating device 55 to prepare the composite preform 70. A series of steps (FIGS. 7 (a) to (c)) for producing the composite container 10A and a series of steps (FIGS. 7 (d) to (g)) for producing the composite container 10A by blow molding are performed at different locations (factory, etc.). ) Will be possible.

Next, the composite preform 70 is heated by the near-infrared heating device 51, which is a second heating device (see FIG. 7D). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the second near-infrared heating device 51 while rotating with the mouth portion 11a facing downward. The heating time is preferably 8 to 60 seconds, more preferably 10 to 30 seconds. The heating temperature of the preform 10a and the plastic member 40a may be, for example, 90 ° C to 130 ° C.

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

The composite preform 70 is molded using the blow molding die 50, and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the cases of FIGS. 5 (a) to 5 (f) described above. A composite container 10A provided with the outer shrinking member (outer shrinking member) 40 is obtained (see FIGS. 7 (e) to 7 (g)).

As described above, according to the present embodiment, the preform 10a of the composite preform 70 and the plastic member 40a are integrally formed by performing blow molding on the composite preform 70 in the blow molding mold 50. To prepare a composite container 10A having a container body 10 and a plastic member 40. As a result, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be made of separate members. Therefore, various functions and characteristics can be freely imparted to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

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

Modifications Next, modifications of the first embodiment of the present invention will be described with reference to FIGS. 8, 9 and 10 (a) to 10 (f).

The modified examples shown in FIGS. 8, 9 and 10 (a) to 10 (f) do not have a body and a bottom as the plastic member 40a, but use a cylindrical plastic member 40a. ..

In the composite container 10A shown in FIG. 8, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20, but does not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 9, the plastic member 40a is in close contact so as to cover only the body portion 20a of the preform 10a, and more specifically, the neck portion 13 of the container body 10 of the body portion 20a. It covers the area excluding the portion 13a corresponding to the portion 13a and the portion corresponding to the lower portion of the body portion 20a.

The other configurations in FIGS. 8, 9 and 10 (a) to 10 (f) are substantially the same as the embodiments shown in FIGS. 1 to 5. In the modified examples shown in FIGS. 8, 9 and 10 (a) to 10 (f), the same parts as those of the embodiments shown in FIGS. 1 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiments shown in FIGS. 1 to 5, so detailed description thereof will be omitted. Further, in FIGS. 8, 9 and 10 (a) to 10 (f), the plastic member 40 having an action of contracting with respect to the preform 10a may be used.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 11 to 20 are views showing a second embodiment of the present invention. In FIGS. 11 to 20, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

First, the outline of the composite container produced by the blow molding method according to the present embodiment will be described with reference to FIGS. 11 and 12.

As will be described later, the composite container 10A shown in FIGS. 11 and 12 is formed into a composite preform 70 (see FIG. 13) including a preform 10a, an inner label member 60a, and a plastic member 40a by using a blow molding die 50. On the other hand, it is obtained by integrally expanding the preform 10a, the inner label member 60a, and the plastic member 40a of the composite preform 70 by performing biaxial stretch blow molding.

Such a composite container 10A is provided in close contact with the container body 10 made of a plastic material located inside, the inner label member 60 provided in close contact with the outside of the container body 10, and the outer side of the inner label member 60. The plastic member 40 is provided.

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

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

Further, the plastic member 40 is in close contact with the outer surface of the container body 10 and the outer surface of the inner label member 60 in a thinly extended state, and is in close contact with the container body 10 so as not to easily move or rotate. There is.

It is considered that at least a part of the plastic member 40 is translucent or transparent, and in this case, the inner label member 60 can be visually recognized from the outside through the translucent or transparent portion. The plastic member 40 may be translucent or transparent as a whole, or may have an opaque portion and a translucent or transparent portion (for example, a window portion). In this embodiment, a case where the entire plastic member 40 is transparent will be described as an example.

Next, the inner label member 60 will be described. The inner label member 60 (60a) is provided so as to surround the outside of the preform 10a as described later, and is obtained by biaxially stretching blow molding integrally with the preform 10a and the plastic member 40a. It is a thing. The inner label member 60a has a near-infrared transmittance of 50% or more, preferably 65% or more, more preferably 80% or more, and the inner label member 60 has a near-infrared transmittance of 50% or more. In the near-infrared irradiation of the composite preform before blow molding, the plastic member 40a, the inner label member 60, and the preform 10a are uniformly heated.

The inner label member 60 is attached to the outer surface of the container body 10 without being adhered, and is in close contact with the container body 10 so as not to move or rotate. The inner label member 60 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. As shown in FIG. 12, the inner label member 60 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 inner label member 60 is provided so as to cover the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, excluding the mouth portion 11 and the neck portion 13. As a result, desired characters, images, and the like can be added to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, and the composite container 10A can be decorated and information can be displayed.

The inner label member 60 may be provided in the entire area or a part of the container body 10 other than the mouth portion 11. For example, the inner label member 60 may be provided so as to cover the entire neck portion 13, shoulder portion 12, body portion 20, and bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of inner label members 60 is not limited to one, and a plurality of inner label members 60 may be provided. The inner label member 60 may be provided in the same area as the plastic member 40, or may be provided in a narrower area than the plastic member 40. In the latter case, the inner label member 60 is preferably completely covered by the plastic member 40.

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

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

The plastic member 40 is attached to the outer surface of the inner label member 60 without being adhered, and is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is thinly stretched on the outer surface of the inner label member 60 to cover the inner label member 60. As shown in FIG. 12, 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 addition, since the configurations of the container body 10 and the plastic member 40 are substantially the same as those of the first embodiment described above, detailed description thereof will be omitted here.

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

As shown in FIG. 13, the composite preform 70 includes a preform 10a made of a plastic material, a bottomed cylindrical inner label member 60a provided in close contact with the outer side of the preform 10a, and an inner label member 60a. It is provided with a bottomed cylindrical plastic member 40a provided in close contact with the outside.

The inner label member 60a is in close contact with the outer surface of the preform 10a, and is in close contact with the preform 10a in a state where it does not easily move or rotate. The inner label member 60a is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

The inner label member 60a may be pre-designed or printed. For example, in addition to the design, product name, and the like, character information such as the name of the content liquid, the manufacturer, and the name of the raw material may be described. In this case, it is possible to display an image or characters on the composite container 10A without separately attaching a label or the like to the container body 10 after blow molding. For example, the inner label member 60a may be provided on all or part of the body portion 20a of the preform 10a so that an image or characters can be displayed on the body portion 20 of the container body 10 after molding. This eliminates the need for a step of attaching a label using a labeler after sealing the container, so that the manufacturing cost can be suppressed and the yield can be prevented from being lowered.

The material used for such an inner label member 60a is not particularly limited as long as the near-infrared transmittance of the inner label member 60a can be achieved to be 50% or more, but is not particularly limited, but polyethylene, polypropylene, polyethylene. Examples thereof include terephthalate and polyethylene naphthalate, and among these, polyethylene or polypropylene is preferable. Moreover, you may use the thing which blended these materials. The inner label member 60a may be made of the same material as the container body 10 (preform 10a) and / or the plastic member 40a, or may be made of a different material.

Further, the inner label member 60a may contain various materials described below as long as the near-infrared transmittance characteristics are not impaired.

For example, the inner label member 60a may contain a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, it is possible to enhance the gas barrier property of the composite container 10A and prevent the content liquid from being deteriorated by oxygen or water vapor without using a multilayer preform or a preform containing a blend material as the preform 10a. As such a material, PE (polyethylene), PP (polypropylene), MXD-6 (nylon), EVOH (ethylene vinyl alcohol copolymer) or an oxygen absorber such as a fatty acid salt may be mixed with these materials. Be done.

Further, the inner label member 60a may contain a material having a light barrier property such as ultraviolet rays. In this case, without using a multi-layer preform or a preform containing a blended material as the preform 10a, the light barrier property of the composite container 10A is enhanced, oxygen is prevented from entering the container, and the content liquid is deteriorated. It is possible to prevent the evaporation of water vapor from the inside of the container to the outside and prevent the content from being reduced. 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, the inner label member 60a may contain a material (material having low thermal conductivity) having higher heat retention or cold retention 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. As a result, the heat retention or cold retention of the composite container 10A is enhanced. As such a material, foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. Further, it preferably contains hollow particles. The average particle size of the hollow particles is preferably 1 to 200 μm, more preferably 5 to 80 μm. Further, the hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like, but are organic because of their excellent dispersibility. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include the same resins as those described above. Moreover, the above-mentioned commercially available hollow particles can also be used. The content of the hollow particles is preferably 0.01 to 50 parts by mass, and more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the resin contained in the inner label member 60a.

On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without being adhered to the preform 10a so as not to move or rotate. The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

In this case, the inner label member 60a and the plastic member 40a are provided so as to cover the entire body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

The inner label member 60a and the plastic member 40a may be provided in the entire area or a part of the area other than the mouth portion 11a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a. Further, the inner label member 60a and the plastic member 40a are not limited to one each, and a plurality of inner label members 60a may be provided. For example, two inner label members 60a and a plastic member 40a may be provided at two locations on the outer side of the body portion 20a, respectively.

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

In the latter case, the plastic member (outer contraction member) 40a may have an action of contracting with respect to the preform 10a. As the plastic member (outer shrinking member) 40a, it is preferable to use a member that shrinks (for example, heat shrinks) with respect to the preform 10a when an external action (for example, heat) is applied.

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

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

As shown in FIGS. 13 and 14 (a), the plastic member 40a (inner label member 60a) has a bottomed cylindrical shape as a whole, and has a cylindrical body 41 (body 61) and a body 41. It may have a bottom portion 42 (bottom portion 62) connected to (body portion 61). In this case, since the bottom 42 (bottom 62) of the plastic member 40a (inner label member 60a) covers the bottom 30a of the preform 10a, various functions are also provided for the bottom 30 in addition to the body 20 of the composite container 10A. And characteristics can be given.

Further, as shown in FIGS. 19 (described later) and 14 (b), the plastic member 40a (inner label member 60a) has a circular tube shape (bottomless cylindrical shape) as a whole, and has a cylindrical body 41. (Body portion 61) may be provided. In this case, as the plastic member 40a (inner label member 60a), for example, an extrusion tube can be used.

Further, as shown in FIGS. 14 (c) and 14 (d), the plastic member 40a (inner label member 60a) may be manufactured by forming a film into a tubular shape and laminating its ends. good. In this case, as shown in FIG. 14 (c), the plastic member 40a may be formed in a pipe shape (bottomless cylindrical shape) having a body portion 41 (body portion 61), and is formed in FIG. 14 (d). As shown in the above, the bottom portion 42 (bottom portion 62) may be bonded to form a bottomed cylinder shape.

Next, the blow molding method (manufacturing method of the composite container 10A) according to the present embodiment will be described with reference to FIGS. 15 (a) to 15 (f).

First, a preform 10a made of a plastic material is prepared (see FIG. 15A).

Next, the inner label member 60a is provided on the outer side of the preform 10a, and the plastic member 40a is provided on the outer side of the inner label member 60a. As a result, a composite preform 70 having the preform 10a, the inner label member 60a adhered to the outer side of the preform 10a, and the plastic member 40a adhered to the outer side of the inner label member 60a is produced (FIG. 15). See (b)). In this case, the inner label member 60a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 61 and a bottom portion 62 connected to the body portion 61.

At this time, even if the inner label member 60a and the plastic member 40a having the same or slightly smaller inner diameter as the outer diameter of the preform 10a are pushed against the preform 10a, they are brought into close contact with the outer surface of the preform 10a. good. Alternatively, a heat-shrinkable inner label member 60a and a plastic member 40a are provided on the outer surface of the preform 10a, and the inner label member 60a and the plastic member 40a are heat-shrinked by heating to 50 ° C. to 100 ° C. It may be brought into close contact with the outer surface of the preform 10a.

Further, a plastic member 40a may be provided in advance around the inner label member 60a, and the inner label member 60a and the plastic member 40a may be integrally attached to the outside of the preform 10a. Alternatively, the inner label member 60a may be provided on the outer side of the preform 10a, and then the plastic member 40a may be provided on the outer side of the inner label member 60a.

In this way, a series of steps for producing the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a and the inner label member 60a in advance to prepare the composite preform 70 (FIG. 15 (FIG. 15). It becomes possible to carry out a series of steps (FIGS. 15 (d) to (f)) for producing the composite container 10A by blow molding at different places (factory or the like).

Next, the composite preform 70 is heated by the near-infrared heating device 51 (see FIG. 15C).

Subsequently, the composite preform 70 heated by the near-infrared heating device 51 is sent to the blow molding die 50. The composite container 10A is molded using the blow molding die 50, and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the case of the first embodiment described above. A composite container 10A including the 60 and a plastic member 40 provided on the outside of the inner label member 60 is obtained (see FIGS. 15 (d)-(f)).

In addition, the blow molding method (method for manufacturing the composite container 10A) according to the present embodiment is substantially the same as that of the first embodiment described above, and thus detailed description thereof will be omitted here.

Modification Example of Blow Molding Method Next, a modification of the blow molding method (manufacturing method of the composite container 10A) according to the present embodiment will be described with reference to FIGS. 16A to 16F. In the modified examples shown in FIGS. 16A to 16F, the plastic member (outer contracting member) 40a has an action of contracting with respect to the preform 10a, and the other configurations are shown in FIG. 15A. It is substantially the same as the form shown in (f). In FIGS. 16A to 16F, the same parts as those in FIGS. 15A to 15F are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 16A).

Next, the inner label member 60a is provided on the outer side of the preform 10a, and the plastic member (outer shrinkage member) 40a is provided on the outer side of the inner label member 60 (see FIG. 16B). The inner label member 60a and the plastic member (outer shrinking member) 40a are mounted so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a. At least a part of the plastic member (outer shrinking member) 40a may be translucent or transparent.

In this case, a plastic member (outer shrinking member) 40a is provided around the inner label member 60a in advance, and the inner label member 60a and the plastic member (outer shrinking member) 40a are integrally mounted on the outside of the preform 10a. You may. Alternatively, the inner label member 60 may be provided on the outer side of the preform 10a, and then the plastic member (outer shrinkage member) 40a may be provided on the outer side of the inner label member 60.

Next, the preform 10a, the inner label member 60a, and the plastic member (outer shrinking member) 40a are heated by the near-infrared heating device 51 (see FIG. 16C). At this time, the preform 10a, the inner label member 60, and the plastic member (outer contraction member) 40a are uniformly heated in the circumferential direction by the near-infrared heating device 51 while rotating with the mouth portion 11a facing downward. Ru. The heating time is preferably 8 to 60 seconds, more preferably 10 to 30 seconds. The heating temperature of the preform 10a, the inner label member 60a, and the plastic member (outer shrinking member) 40a may be, for example, 90 ° C to 130 ° C.

When the plastic member (outer shrinking member) 40a is heated in this way, the plastic member (outer shrinking member) 40a is thermally shrunk and comes into close contact with the outside of the preform 10a (see FIG. 16C). .. When the plastic member (outer shrinking member) 40a itself has shrinkage, it is made of plastic at the time when the plastic member (outer shrinking member) 40a is provided on the outside of the inner label member 60 (see FIG. 16B). The member (outer contraction member) 40a may be in close contact with the outer side of the inner label member 60.

Subsequently, the preform 10a, the inner label member 60, and the plastic member (outer shrinking member) 40a heated by the near-infrared heating device 51 are sent to the blow molding die 50 (see FIG. 16D).

The preform 10a, the inner label member 60, and the plastic member (outer shrinking member) 40a are molded using the blow molding die 50, and are substantially the same as in the cases of FIGS. 15 (a) to 15 (f) described above. , A composite container 10A including a container body 10, an inner label member 60 provided on the outer surface of the container body 10, and a plastic member (outer shrink member) 40 provided on the outside of the inner label member 60 can be obtained. (See FIGS. 16 (d) to 16 (f)).

Next, other modifications of the blow molding method (method for manufacturing the composite container 10A) according to the present embodiment will be described with reference to FIGS. 17 (a) to 17 (g). In the modified examples shown in FIGS. 17 (a) to 17 (g), the plastic member (outer contraction member) 40a has an action of contracting with respect to the preform 10a, and the preform 10a and the plastic member (outer contraction member) 40a Is heated in two stages, and other configurations are substantially the same as the forms shown in FIGS. 15 (a) to 15 (f). In FIGS. 17 (a) to 17 (g), the same parts as those in FIGS. 15 (a) to 15 (f) are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 17A).

Next, the inner label member 60 is provided on the outer side of the preform 10a, and the plastic member (outer shrinkage member) 40a is provided on the outer side of the inner label member 60 (see FIG. 17B). The plastic member (outer contracting member) 40a is mounted so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a. At least a part of the plastic member (outer shrinking member) 40a may be translucent or transparent.

In this case, a plastic member (outer shrinking member) 40a is provided around the inner label member 60 in advance, and the inner label member 60 and the plastic member (outer shrinking member) 40a are integrally mounted on the outside of the preform 10a. You may. Alternatively, the inner label member 60 may be provided on the outer side of the preform 10a, and then the plastic member (outer shrinkage member) 40a may be provided on the outer side of the inner label member 60.

Next, the preform 10a, the inner label member 60, and the plastic member (outer shrinking member) 40a are heated by the heating device 55, which is the first heating device (see FIG. 17C). The heating device 55 may be a device that irradiates near infrared rays or a device that does not irradiate, as long as it can be thermally shrunk by heating at least the plastic member 40a. At this time, the heating temperature of the preform 10a, the inner label member 60, and the plastic member (outer shrinking member) 40a may be, for example, 50 ° C to 100 ° C.

When the plastic member (outer shrinking member) 40a is heated, the plastic member (outer shrinking member) 40a is heat-shrinked and comes into close contact with the outside of the preform 10a. As a result, the composite preform 70 having the preform 10a, the inner label member 60 adhered to the outside of the preform 10a, and the plastic member (outer shrinking member) 40a adhered to the outside of the inner label member 60 is formed. Obtained (see FIG. 17 (c)).

In this way, the composite preform 70 is produced by heat-adhering the plastic member (outer shrinkage member) 40a to the outside of the preform 10a and the inner label member 60 in advance using the first heating device 55. , A series of steps for producing the composite preform 70 (FIGS. 17 (a) to (c)) and a series of steps for producing the composite container 10A by blow molding (FIGS. 17 (d) to (g)) are separated. It will be possible to carry out at the place (factory etc.).

Next, the composite preform 70 is heated by the near-infrared heating device 51, which is a second heating device (see FIG. 17 (d)). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the second near-infrared heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a, the inner label member 60, and the plastic member (outer shrinking member) 40a in this heating step may be, for example, 90 ° C to 130 ° C.

Subsequently, the composite preform 70 heated by the near-infrared heating device 51, which is the second heating device, is sent to the blow molding die 50 (see FIG. 17E).

The composite preform 70 is molded using the blow molding die 50, and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the cases of FIGS. 15 (a) to 15 (f) described above. A composite container 10A including the inner label member 60 and the plastic member (outer contraction member) 40a provided on the outer side of the inner label member 60 can be obtained (see FIGS. 17 (e) to 17 (g)).

As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding mold 50, the preform 10a of the composite preform 70, the inner label member 60a, and the plastic The manufacturing member 40a is integrally expanded to manufacture a composite container 10A including the container body 10, the inner label member 60, and the plastic member 40. Therefore, the inner label member 60 can be provided in advance on the composite container 10A at the stage of manufacturing the composite container 10A using the preform 10a. Therefore, it is not necessary to provide a step of filling the composite container 10A with the content liquid, sealing the container, and then labeling with a labeler. As a result, the manufacturing cost for manufacturing the final product can be suppressed.
In addition, it is possible to prevent the yield from being lowered when the final product is manufactured due to a defect of the labeler or the like.

Further, according to the present embodiment, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be composed of separate members. Therefore, various functions and characteristics can be freely imparted to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

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

Modifications Next, modifications of the present invention will be described with reference to FIGS. 18, 19 and 20 (a) to 20 (f).

The modified examples shown in FIGS. 18, 19 and 20 (a) to 20 (f) do not have a body and a bottom as the inner label member 60a and the plastic member 40a, but have a cylindrical inner label member 60a and a cylindrical inner label member 60a. The plastic member 40a is used.

In the composite container 10A shown in FIG. 18, the inner label member 60 and the plastic member 40 extend from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20, but do not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 19, the inner label member 60a and the plastic member 40a are in close contact with each other so as to cover only the body portion 20a of the preform 10a. It covers an area excluding a portion 13a corresponding to the neck portion 13 of the main body 10 and a portion corresponding to the lower portion of the body portion 20a.

The other configurations in FIGS. 18, 19 and 20 (a) to 20 (f) are substantially the same as the embodiments shown in FIGS. 11 to 15. In the modified examples shown in FIGS. 18, 19 and 20 (a) to 20 (f), the same parts as those of the embodiments shown in FIGS. 11 to 15 are designated by the same reference numerals, and detailed description thereof will be omitted.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiments shown in FIGS. 11 to 15, so detailed description thereof will be omitted. Further, in FIGS. 18, 19 and 20 (a) to 20 (f), the plastic member 40 having an action of contracting with respect to the preform 10a may be used.

Claims (1)

In the method of manufacturing a composite container
The process of preparing a preform made of plastic material and
The process of providing a plastic member on the outside of the preform and
A step of heating the preform and the plastic member by near infrared rays and inserting them into a blow molding die.
A step of integrally expanding the preform and the plastic member by performing blow molding on the preform and the plastic member in the blow molding die is provided.
The step of providing the plastic member is a step of pushing the plastic member having the same or smaller inner diameter as the outer diameter of the preform against the preform to bring the plastic member into close contact with the outer surface of the preform, or heat. Including a step of providing the shrinkable plastic member on the outer surface of the preform and heat-shrinking the plastic member to bring it into close contact with the outer surface of the preform.
A method for manufacturing a composite container, wherein the near-infrared transmittance of the plastic member is 50% or more in the entire near-infrared wavelength region.

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