JP2019209695A - Composite container, production method thereof, composite preform, and plastic member - Google Patents

Abstract

To provide a composite container, a production method thereof, capable of applying various functions and properties to a container, and having high adhesion between a container body and a plastic member, and provide a composite perform, and a plastic member.SOLUTION: First, a preform 10a made of a plastic material is prepared, then, providing a plastic member 40a so as to surround an outside of the preform 10a. Then a composite preform 70 is heated and inserted into a blow molding mold 50, then blow molding is performed to the composite preform 70 in the blow molding mold 50, thereby the preform 10a and the plastic member 40a of the composite preform 70 are integrated and expanded to obtain a composite container 10A. The plastic member 40a is a shrinkable tube formed of multi layers.SELECTED DRAWING: Figure 5

Description

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

  Recently, plastic bottles for storing content liquids such as foods and drinks have become common, and such plastic bottles store content liquids.

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

  By the way, in the conventional biaxial stretch blow molding method, for example, a preform including a single layer material such as PET or PP, a multilayer material, a blend material, or the like is used to form a container shape. However, in the conventional biaxial stretch blow molding method, the preform is generally simply formed into a container shape. For this reason, when various functions and characteristics (barrier property, heat retaining property, etc.) are given to the container, the means is limited, for example, by changing the material constituting the preform. In particular, it is difficult to have different functions and characteristics depending on the part of the container (for example, the trunk and the bottom).

JP 2009-241526 A

The present invention has been made in consideration of such points, and includes a composite container and a method for manufacturing the composite container, a composite preform, and a plastic member that can impart various functions and characteristics to the container. The purpose is to provide.

The present invention relates to a method for producing a composite container,
Preparing a preform made of plastic material;
Providing a plastic member on the outside of the preform;
Heating the preform and the plastic member and inserting it into a blow mold; and
A step of blow-molding the preform and the plastic member in the blow-molding mold to inflate the preform and the plastic member together,
The plastic container is a shrinkable tube composed of multiple layers.

  The present invention is the method for manufacturing a composite container, wherein the plastic member includes a gas barrier layer.

  The present invention is the method of manufacturing a composite container, wherein the plastic member includes a light barrier layer.

  The present invention is the method for producing a composite container, wherein the plastic member includes a low thermal conductivity layer.

The present invention relates to a composite preform,
A preform made of plastic material,
A plastic member provided to surround the outside of the preform,
The plastic member is in close contact with the outside of the preform;
The plastic preform is a composite preform characterized in that it is a shrinkable tube composed of multiple layers.

  The present invention is the composite preform, wherein the plastic member includes a gas barrier layer.

  The present invention is the composite preform, wherein the plastic member includes a light barrier layer.

  The present invention is the composite preform, wherein the plastic member includes a low thermal conductivity layer.

The present invention relates to a composite container,
A container body made of plastic material;
A plastic member provided in close contact with the outside of the container body,
The container body and the plastic member are expanded integrally by blow molding,
The composite container is a composite container, wherein the plastic member is a shrinkable tube composed of multiple layers.

  The present invention is the composite container, wherein the plastic member includes a gas barrier layer.

  The present invention is the composite container, wherein the plastic member includes a light barrier layer.

  The present invention is the composite container, wherein the plastic member includes a low thermal conductivity layer.

The present invention provides a composite container that is mounted so as to surround the outer side of the preform and is heated together with the preform, and includes the preform and a plastic member that is in close contact with the outer side of the preform. A plastic member for manufacturing,
It has a cylindrical body that covers at least the body of the preform,
It is a plastic member characterized by being a shrinkable tube composed of multiple layers.

  The present invention is a plastic member comprising a gas barrier layer.

  The present invention is a plastic member comprising a light barrier layer.

  The present invention is a plastic member comprising a low thermal conductivity layer.

  According to the present invention, the preform of the composite preform and the plastic member are expanded integrally by performing blow molding on the composite preform in the blow mold. For this reason, the preform (container body) and the plastic member can be formed of different 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. In addition, since the plastic member is a shrinkable tube, less air enters between the container body and the plastic member after blow molding, and the adhesion between them can be improved. Furthermore, since the plastic member is composed of multiple layers, various functions and characteristics can be imparted to the composite container by changing the material constituting each layer.

FIG. 1 is a partial vertical sectional view showing a composite container according to a first embodiment of the present invention. FIG. 2 is a horizontal sectional view showing the composite container according to the first embodiment of the present invention (sectional view taken along the line II-II in FIG. 1). FIG. 3 is a vertical sectional view showing the composite preform according to the first embodiment of the present invention. FIG. 4 is a perspective view showing a plastic member. FIG. 5 is a schematic view showing an embodiment of a method for producing a shrinkable tube composed of multiple layers. FIGS. 6A to 6F are schematic views showing a blow molding method according to the first embodiment of the present invention. FIGS. 7A to 7F are schematic views showing a blow molding method according to a modification of the first embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 9 is a horizontal sectional view (sectional view taken along line IX-IX in FIG. 7) showing the composite container according to the second embodiment of the present invention. FIG. 10 is a vertical sectional view showing a composite preform according to the second embodiment of the present invention. FIG. 11 is a perspective view showing an inner label member and a plastic member. FIGS. 12A to 12F are schematic views showing a blow molding method according to the second embodiment of the present invention. FIGS. 13A to 13G are schematic views showing a blow molding method according to a modification of the second embodiment of the present invention.

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

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

  A composite container 10A shown in FIGS. 1 and 2 includes, as will be described later, a composite preform 70 including a preform 10a using a blow mold 50 and a plastic member 40a which is a multi-layer shrinkable tube (see FIG. 3). ), The preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded.

  Such a composite container 10 </ b> A 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.

  Among 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 trunk portion 20 provided below the shoulder portion 12, The bottom part 30 provided below the trunk | drum 20 is provided.

  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 so as not to move or rotate easily, or does not fall by its own weight. It is closely attached to the extent.

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

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

  The neck portion 13 is located between the flange portion 17 and the shoulder portion 12 and has a substantially cylindrical shape having a substantially uniform diameter. The shoulder 12 is located between the neck 13 and the trunk 20 and has a shape whose diameter gradually increases from the neck 13 toward the trunk 20.

  Furthermore, the trunk | drum 20 has a cylindrical shape with 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 cylindrical shape such as a rectangular cylindrical shape or an octagonal cylindrical shape. Or the trunk | drum 20 may have a cylinder shape with a horizontal cross section which is not uniform toward upper direction from the downward direction. Moreover, in this Embodiment, although the unevenness | corrugation is not formed in the trunk | drum 20, and has a substantially flat surface, it is not restricted to this. For example, unevenness such as a panel or a groove may be formed on the body portion 20.

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

  Moreover, although the thickness of the container main body 10 in the trunk | drum 20 is not limited to this, For example, it can be made thin to about 50 micrometers-250 micrometers. Further, the weight of the container body 10 is not limited to this, but can be 10 g to 20 g. Thus, by reducing the thickness of the container main body 10, the weight of the container main body 10 can be reduced.

  Such a container main 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), or PC (polycarbonate) may be used. preferable. Moreover, you may blend and use the various resin mentioned above. The container body 10 may be colored in colors such as red, blue, yellow, green, brown, black, and white, but is preferably colorless and transparent in consideration of ease of recycling. Further, a vapor deposition film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the container body 10 in order to enhance the barrier property of the container.

  The container body 10 can also be formed as a multilayer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer has 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). You may form as a multilayer bottle which has gas barrier property and light-shielding property by extrusion-molding preform 10a which consists of three or more layers as resin which it has (intermediate layer), and carrying out blow molding. As the intermediate layer, a resin obtained by blending the above-described various resins may be used.

  Further, by mixing an inert gas (nitrogen gas, argon gas) with the thermoplastic resin melt, a foam preform having a foam cell diameter of 0.5 to 100 μm is formed, and this foam preform is blow-molded. Thus, the container body 10 may be manufactured. Since such a container main body 10 contains the foam cell, the light shielding property of the container main body 10 whole can be improved.

  The full capacity of such a container body 10 is not particularly limited, but may be composed of, for example, 100 ml to 2000 ml bottles. Alternatively, the container main body 10 may be a large bottle having a full capacity of, for example, 10L to 60L.

Next, the plastic member 40 will be described. As will be described later, the plastic member 40 (40a) is provided so as to surround the outside of the preform 10a. After being in close contact with the outside of the preform 10a, the plastic member 40 (40a) is obtained by biaxial stretching blow molding together with the preform 10a. It is done. Further, the plastic member 40a has a function of contracting with respect to the preform 10a (contracting tube). Since the plastic member 40a is a shrinkable tube, there is no deviation from the preform 10a, which is preferable.
Moreover, since followability is high with respect to blow molding, it is preferable.

  The plastic member (shrinkable tube) 40a is a multi-layered shrinkable tube, and is provided outside the preform 10a. The plastic member (shrinkable tube) 40a is heated integrally with the preform 10a and biaxially stretched and blow-molded. The member 40 is obtained. Note that the plastic member (shrinkable tube) 40a itself may be shrinkable or elastic and can be shrunk without applying an external action, and has an external action (for example, heat). When applied, the preform 10a may contract (for example, heat shrink), but from the viewpoint of high followability, when an external action (for example, heat) is applied, the preform 10a is contracted. Those that shrink (for example, heat shrink) with respect to the reform 10a are preferable.

  The plastic member 40 is attached to the outer surface of the container main body 10 without being bonded, and is in close contact with the container main body 10 so that it does not move or rotate, or in close contact with the container main body 10 so that it does not fall by its own weight. The plastic member 40 is thinly extended on the outer surface of the container body 10 to cover the container body 10. 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. Since the plastic member 40a is a shrinkable tube having a function of contracting with respect to the preform 10a, there is little air entering between the container main body and the plastic member 40 after blow molding, and their adhesion is high.

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

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

  Moreover, the thickness of the plastic member 40 is not limited to this, but can be set to, for example, about 5 μm to 50 μm in a state of being 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 bottomless cylindrical plastic member (shrinkable tube) 40a provided outside the preform 10a.

  Among 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. Among these, the mouth part 11 a corresponds to the mouth part 11 of the container body 10 described above, and has substantially the same shape as the mouth part 11. Moreover, the trunk | drum 20a respond | corresponds to the neck part 13, the shoulder part 12, and the trunk | drum 20 of the container main body 10 mentioned above, and has a substantially cylindrical shape. The bottom 30a corresponds to the bottom 30 of the container body 10 described above, and has a substantially hemispherical shape.

  The plastic member (shrinkable tube) 40a is attached to the outer surface of the preform 10a without being bonded, and is in close contact with the preform 10a so that it does not move or rotate, or does not fall by its own weight. It is in close contact. The plastic member (shrinkable tube) 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

  In this case, the plastic member 40a is provided so as to cover the entire region of the trunk portion 20a excluding the portion 13a corresponding to the neck portion 13 of the container body 10.

  The plastic member (shrinkable tube) 40a may be provided in the entire region or a partial region other than the mouth portion 11a. For example, the plastic member (shrinkable tube) 40 a may be provided so as to cover the entire body portion 20 a including the neck portion 13. Alternatively, the plastic member (shrinkable tube) 40a may cover the entire region of the trunk portion 20a and a partial region of the bottom portion 30a. Furthermore, the number of plastic members (shrinkable tubes) 40a is not limited to one, and a plurality of members may be provided. For example, two plastic members (shrinkable tubes) 40a may be provided at two locations on the outer side of the body portion 20a.

  Each layer of the plastic member (shrinkable tube) 40a is manufactured using a resin material including a polyester resin, a polyolefin resin, a polystyrene resin, a polycarbonate resin, and / or a polyamide resin. Among these, from the viewpoint of improving gas barrier properties such as oxygen barrier property or water vapor barrier property of the container body and light barrier properties such as ultraviolet rays, the resin material preferably contains a polyester resin, and is easy to recycle. From this point of view, the resin composition preferably comprises a polyolefin resin. Examples of polyester resins include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene isophthalate, and polyethylene naphthalate (PEN). Among these, the above-described barrier properties and further mechanical strength are improved. PET and PEN are preferable, and PEN is more preferable. Examples of the polyolefin-based resin include polyethylene (PE), polypropylene (PP), polybutene (PB), polymethylpentene, ethylene-vinyl alcohol copolymer, etc. Among them, the reason for easy moldability Therefore, PE and PP are preferable.

  In addition to the above resins, the resin materials are polylactic acid, polyvinyl chloride, poly-4-methylpentene-1, polystyrene, AS resin, ABS spirit, 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, Fluoro rubber, Nylon 6, Nylon 6, 6, Nylon MXD6, Aromatic polyamide, Polycarbonate, Poly terephthalate, Poly terephthalate Polyethylene, polynaphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyethersulfone, silicone resin, polyurethane, phenol Resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin and the like may be included.

  The resin material may include a copolymer obtained by polymerizing two or more monomer units constituting the above-described resin. Further, the resin material may be a blend resin material containing two or more of the above-described resins. Furthermore, the resin material may contain various additives in addition to the main component resin as long as the characteristics are not impaired. Examples of additives include plasticizers, UV stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, yarn friction reducing agents, slip agents, mold release agents, Examples include oxidants, ion exchangers, and color pigments.

  Further, the resin material forming each layer of the plastic member (shrinkable tube) 40 (40a) may include the same material as the container body 10 (preform 10a). For example, the plastic member 40 (40a) may include a layer made of the same material as the container body 10 (preform 10a). In this case, in the composite container 10A, for example, the plastic member 40 can be arranged mainly on the portion where the strength is to be increased, and the strength of the portion can be selectively increased. For example, a plastic member 40 may be provided around the shoulder 12 of the container body 10 to increase the strength of this portion. Examples of such a material include polyolefin resins such as PE and PP, polyester resins such as PET and PEN, and polycarbonate resins.

  Further, the resin material forming each layer of the plastic member (shrinkable tube) 40 (40a) may include a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. For example, the plastic member 40 (40a) may include a layer (gas barrier layer) made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, without using a multi-layer preform or a preform containing a blend material as the preform 10a, the gas barrier property of the composite container 10A is improved, oxygen is prevented from entering the container, and the content liquid is prevented from deteriorating. In addition, it is possible to prevent the evaporation of water vapor from the inside of the container to the outside and to prevent the internal volume from decreasing. For example, the plastic body 40 may be provided in the entire region of the shoulder portion 12, the neck portion 13, the body portion 20, and a part of the bottom portion 30 in the container body 10, and the gas barrier property of this portion may be enhanced. Such materials include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), PEN (polyethylene naphthalate), or these It is also possible to mix an oxygen absorbing material such as a fatty acid salt with the material.

  The resin material forming each layer of the plastic member (shrinkable tube) 40 (40a) may include a material having light barrier properties such as ultraviolet rays. For example, the plastic member 40 (40a) may include a layer (light barrier layer) made of a material having light barrier properties such as ultraviolet rays. In this case, the light barrier property of the composite container 10A can be improved and the content liquid can be prevented 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, a plastic member 40a may be provided in the entire region of the shoulder portion 12, the neck portion 13, and the body portion 20 and a part of the bottom portion of the container body 10 to enhance the ultraviolet barrier property of this portion. As such a material, a resin material containing two or more kinds of the above-described resins, or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered. Moreover, you may use the foaming member with the foam cell diameter of 0.5-100 micrometers produced by mixing inert gas (nitrogen gas, argon gas) with the melt of a thermoplastic resin.

  In addition, the resin material forming each layer of the plastic member (shrinkable tube) 40 (40a) is a material (thermally conductive material) having higher heat retention or cold retention than the plastic material constituting the container body 10 (preform 10a). Low material). For example, the plastic member 40 (40a) is a layer (low thermal conductivity layer) made of a material (material having low thermal conductivity) having a higher thermal insulation property or a higher thermal insulation property than a plastic material constituting the container body 10 (preform 10a). ) May be provided. In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. Thereby, the heat retaining property or cold retaining property of the composite container 10A is enhanced. For example, the plastic member 40 may be provided on the whole or a part of the body 20 in the container body 10 to enhance the heat retaining property or the cold retaining property 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. Examples of such materials include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. It is preferable to mix hollow particles with the resin material. The average particle diameter of the hollow particles is preferably 1 to 200 μm, and 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. 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. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include styrene resins such as cross-linked styrene-acrylic resins, (meth) acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluorine resins, polyamide resins, and polyimides. Resin, polycarbonate resin, polyether resin and the like. In addition, Ropeke HP-1055, Ropeke HP-91, Ropeke OP-84J, Ropeke Ultra, Ropeke SE, Ropeke ST (made by Rohm and Haas Co.), Nipol MH-5055 (made 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 to 50 parts by mass and more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the resin material contained in each layer of the plastic member 40a. preferable.

  The resin material forming each layer of the plastic member (shrinkable tube) 40 (40a) may include a material that is less slippery than the plastic material constituting the container body 10 (preform 10a). For example, the plastic member 40 (40a) may include a layer made of a material that is less slippery than the plastic material as the outermost layer. In this case, the user can easily hold the composite container 10 </ b> A without changing the material of the container body 10. For example, a plastic member 40 may be provided on all or part of the body 20 of the container body 10 so that the body 20 can be easily held.

  Each layer of the plastic member (shrinkable tube) 40 (40a) can include at least a colorant in addition to the resin material described above. As the colorant, a colorant such as brown, black, green, white, blue, or red can be used. The colorant may be a pigment or a dye, but is preferably a pigment from the viewpoint of light resistance. Among the colorants described above, light reflecting pigments such as titanium white, aluminum powder, mica powder, zinc sulfide, zinc white, calcium carbonate, kaolin, talc and other white pigments, light absorbing pigments, carbon black, Colored pigments such as ceramic black and bone black are preferred. By including such pigments in the colored layer, it is possible to reduce the visible light transmittance of the plastic member 40 after blow molding, and to prevent a change in the quality of the content liquid filled in the composite container 10A. can do. The plastic member 40a may be transparent or opaque.

  Furthermore, the plastic member (shrinkable tube) 40 (40a) may be designed or printed. In this case, it is possible to display images and characters on the composite container 10A without separately providing a label or the like to the container body 10 after blow molding. For example, the plastic member 40 may be provided on all or part of the trunk 20 in the container body 10, and images or characters may be displayed on the trunk 20. In this case, the material of the plastic member 40 may be the same as that of the container body 10 or may be different from that of the container body 10. 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, a flexographic printing method, or the like. For example, when the inkjet method is used, a printing layer can be formed by applying UV curable ink to the plastic member 40a, irradiating it with UV, and curing it. This printing may be performed on the plastic member (shrinkable tube) 40a before being attached to the preform 10a, or may be performed in a state where the plastic member 40a is provided outside the preform 10a. Furthermore, the plastic member 40 of the composite container 10A after blow molding may be printed.

  The plastic member 40 (40a) is composed of multiple layers as described above. For example, the main components constituting the innermost and outermost layers may be the same or different. Specific examples of the layer structure include, from the innermost surface, low density PE / adhesive layer / EVOH / adhesive layer / low density PE, and PP / adhesive layer / EVOH / adhesive layer / PP. Examples of the adhesive constituting the adhesive layer include a polyvinyl acetate adhesive, a polyacrylate adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, Examples thereof include polyamide adhesives, polyimide adhesives, amino resin adhesives, phenol resin adhesives, epoxy adhesives, polyurethane adhesives, rubber adhesives, and silicone adhesives.

  Next, the shape of the plastic member (shrinkable tube) 40a will be described.

  As shown in FIGS. 3 and 4, the plastic member (shrinkable tube) 40a preferably has a bottomless cylindrical shape as a whole. By providing such a plastic member 40, various functions and characteristics can be imparted to the body portion 20 of the composite container 10A.

In the composite container 10 </ b> A shown in FIG. 1, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to the lower portion of the trunk portion 20. Further, in the composite preform 70 shown in FIG. 3, the plastic member (shrinkable tube) 40a is in close contact so as to cover only the trunk portion 20a of the preform 10a, and more specifically, the container body of the trunk portion 20a. 10 covers a region excluding a portion 13a corresponding to ten neck portions 13 and a portion corresponding to the lower portion of the trunk portion 20a. The present invention is not limited to this, and the plastic member 40 may cover a part or the whole of the bottom of the container body 10. Similarly, the plastic member (shrinkable tube) 40 a A part of the bottom 30a of the preform 10a may be covered.
The same applies to the following embodiments.

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

  The plastic member 40a is manufactured by a method including an extrusion process. More specifically, first, two or more kinds of resin materials are heated and melted in an extruder, respectively, and the melted resin materials are continuously coextruded from a ring die. Note that a colorant or the like may be mixed in the resin material to be co-extruded. Next, the coextruded resin material is cooled to form an unstretched multilayer extruded tube 1 (see FIG. 5A). One end of the unstretched multilayer extruded tube 1 is welded or bonded to close one end of the multilayer extruded tube 1. Next, the multilayer extruded tube 1 whose one end is closed is placed in a tubular mold 2 (see FIG. 5B). The inner diameter of the mold 2 is larger than the outer diameter of the multilayer extruded tube 1. Next, the blow device 3 is disposed (mounted) on the other end of the multilayer extruded tube 1 (see FIG. 5C). At this time, it is preferable that the blow device 3 is in close contact with the multilayer extruded tube 1 so that air does not leak between them. Subsequently, the multilayer extruded tube 1, the mold 2 and the blow device 3 are sent to the heating furnace 4 in this arrangement, and heated to 70 to 150 ° C. inside the heating furnace 4 (see FIG. 5D). As the heating furnace 4, a hot-air circulating heating furnace may be used in order to make the inside uniform. Or you may heat these by making the multilayer extrusion tube 1, the metal mold | die 2, and the blow apparatus 3 pass in the heated liquid. Next, the multilayer extruded tube 1, the mold 2 and the blow device 3 are taken out from the heating furnace 4, and air is blown into the multilayer extruded tube 1 from the blow device 3, whereby the inner surface of the multilayer extruded tube 1 is pressurized and stretched. To do. Thereby, the multilayer extrusion tube 1 expand | swells and is expanded in diameter along the inner surface shape of the metal mold | die 2 (refer FIG.5 (e)). Thereafter, the multilayer extruded tube 1 is cooled in cold water while air is blown out from the blower 3, and the multilayer extruded tube is taken out from the mold 2 (see FIG. 5 (f)). By cutting this into a desired size, a plastic member 40a is obtained (see FIG. 5G).

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

  First, a preform 10a made of a plastic material is prepared (see FIG. 6A). In this case, for example, the preform 10a may be manufactured by an injection molding method using an unillustrated injection molding machine.

  Next, a plastic member (shrinkable tube) 40a is loosely inserted on the outside of the preform 10a (see FIG. 6B). In this case, the plastic member (shrinkable tube) 40a has a bottomless cylindrical shape as a whole and has a cylindrical body 41. This plastic member (shrinkable tube) 40a covers the entire area excluding the portion corresponding to the neck 13 of the container body 10 in the body 20a.

  Next, the preform 10a and the plastic member (shrinkable tube) 40a are heated by the heating device 51 (see FIG. 6C). Thereby, the composite preform 70 having the preform 10a and the plastic member (shrinkable tube) 40a in close contact with the outside of the preform 10a can be manufactured. At this time, the preform 10a and the plastic member (shrinkable tube) 40a are evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member (shrinkable tube) 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  In this way, the plastic member (shrinkable tube) 40a is heated, so that the plastic member (shrinkable tube) 40a is thermally contracted and is in close contact with the outside of the preform 10a (see FIG. 6C). In the case where the plastic member (shrinkable tube) 40a itself has shrinkability, the plastic member (shrinkable) when the plastic member (shrinkable tube) 40a is provided outside the preform 10a (see FIG. 6B). Tube) 40a may be in close contact with the outside of the preform 10a.

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 6D).

  The composite container 10 </ b> A is molded using this blow molding die 50. In this case, the blow mold 50 includes a pair of body molds 50a and 50b and a bottom mold 50c which are divided from each other (see FIG. 6D). In FIG. 6 (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.

  Next, as shown in FIG. 6 (e), after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the pair of body molds 50a and 50b and the bottom mold 50c are used. A sealed blow molding die 50 is configured. Next, air is press-fitted into the preform 10 a and biaxial stretch blow molding is performed on the composite preform 70.

  As a result, the container body 10 is obtained from the preform 10 a 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 mold 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded as a unit. Thereby, the preform 10a and the plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow mold 50.

  In this manner, a 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. 6 (f), the pair of body molds 50 a and 50 b and the bottom mold 50 c are separated from each other, and the composite container 10 </ b> A is taken out from the blow molding mold 50.

Modification of manufacturing method of composite container 10A

  Next, with reference to FIGS. 7A to 7G, another modification of the method (blow molding method) for manufacturing the composite container 10A according to the present embodiment will be described. The modification shown in FIGS. 7A to 7G is for heating the preform 10a and the plastic member (shrinkable tube) 40a in two stages, and other configurations are shown in FIGS. 6A to 6F. ). 7A to 7G, the same parts as those in FIGS. 6A to 6F are denoted by the same reference numerals, and detailed description thereof is omitted.

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

  Next, a plastic member (shrinkable tube) 40a is relaxed and inserted on the outside of the preform 10a (see FIG. 7B). In this case, the plastic member (shrinkable tube) 40a has a bottomless cylindrical shape as a whole and has a cylindrical body 41. The plastic member (shrinkable tube) 40 is mounted so as to cover the entire region of the body portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10.

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

  When the plastic member (shrinkable tube) 40a is heated, the plastic member (shrinkable tube) 40a is thermally shrunk and adheres to the outside of the preform 10a. Thereby, the composite preform 70 having the preform 10a and the plastic member (shrinkable tube) 40a in close contact with the outside of the preform 10a is obtained (see FIG. 7C).

  In this way, by using the first heating device 55 to preliminarily heat and adhere the plastic member (shrinkable tube) 40a to the outside of the preform 10a to produce the composite preform 70, the composite preform 70 can be A series of steps (FIGS. 7 (a) to (c)) to be produced and a series of steps (FIGS. 7 (d) to (g)) to produce the composite container 10A by blow molding are separated at different places (factories, etc.). Can be implemented.

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 7D). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member (shrinkable tube) 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 7E). In this case, heating for shrinking the plastic member (shrinkable tube) 40a and heating for blow-molding the preform 10a can be performed in the same process.

  The composite preform 70 is molded using the blow mold 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 above-described FIGS. A composite container 10A provided with the contracted tube (shrinkable tube) 40 is obtained (see FIGS. 7E to 7G).

  As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding die 50, the preform 10a and the plastic member 40a of the composite preform 70 are formed. The composite container 10 </ b> A including the container body 10 and the plastic member 40 is manufactured by inflating as a unit. Thereby, preform 10a (container main part 10) and plastic member 40a (plastic member 40) can be constituted from another member. 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 is necessary to prepare a new molding equipment for manufacturing the composite container 10A. Absent. Moreover, since the plastic member 40a is provided outside the preform 10a, it is not necessary to prepare a new molding facility for molding the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 8 to 13 are views showing a second embodiment of the present invention. 8 to 13, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is 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.

  A composite container 10A shown in FIGS. 8 and 9 is formed into a composite preform 70 (see FIG. 10) including a preform 10a, an inner label member 60a, and a plastic member 40a using a blow molding die 50, as will be described later. On the other hand, by performing biaxial stretch blow molding, the preform 10a, the inner label member 60a, and the plastic member 40a of the composite preform 70 are integrally expanded.

  Such a composite container 10 </ b> A is provided in close contact with the outer side of the inner label member 60 and the inner label member 60 provided in close contact with the outer side of the container main body 10. The plastic member 40 is provided.

  Among 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 trunk portion 20 provided below the shoulder portion 12, The bottom part 30 provided below the trunk | drum 20 is provided.

  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.

  The plastic member 40 is a shrinkable tube composed of multiple layers, and is in close contact with the outer surface of the container main body 10 and the outer surface of the inner label member 60 in a thinly extended state, and easily moves relative to the container main body 10. Alternatively, they are in close contact with each other so that they do not rotate, or are in close contact with each other so as not to fall by their own weight.

  It is conceivable that at least a part of the plastic member 40 is translucent or transparent. 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 entirely translucent or transparent, or may have an opaque portion and a translucent or transparent portion (for example, a window portion). In the present 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. As will be described later, the inner label member 60 (60a) is provided so as to surround the outer side of the preform 10a, and is obtained by performing biaxial stretch blow molding integrally with the preform 10a and the plastic member 40a. Is.

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

  In this case, the inner label member 60 is provided so as to cover the shoulder portion 12 and the trunk portion 20 except for the mouth portion 11, the neck portion 13, and the bottom portion 30 in the container main body 10. Thereby, desired characters, images, and the like can be imparted to the shoulder portion 12 and the trunk portion 20 of the container main 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 region or a partial region other than the mouth portion 11 of the container main body 10. For example, the inner label member 60 may be provided so as to cover a part of the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30 except for the mouth portion 11 in the container body 10. Alternatively, the inner label member 60 may be provided so as to cover the entire region of the neck portion 13, the entire region of the shoulder portion 12, the entire region of the trunk portion 20, and a part of the bottom portion 30. Furthermore, the inner label member 60 is not limited to one, and a plurality of inner label members 60 may be provided. The inner label member 60 may be provided in the same region as the plastic member 40, or may be provided in a region narrower than the plastic member 40. In the latter case, the inner label member 60 is preferably completely covered by the plastic member 40.

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

  Next, the plastic member 40 will be described. As will be described later, the plastic member 40 (40a) is provided so as to surround the outer side of the inner label member 60a, and is obtained by performing biaxial stretch blow molding integrally with the preform 10a and the inner label member 60a. Is.

  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 that it does not move or rotate, or is in close contact with the container body 10 so that it does not fall by its own weight. Yes. The plastic member 40 is thinly stretched on the outer surface of the inner label member 60 to cover the inner label member 60. As shown in FIG. 8, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

  In addition, since the configurations of the container body 10 and the plastic member 40 are substantially the same as those in the first embodiment described above, detailed description thereof is 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. 10, the composite preform 70 includes a plastic material preform 10a, a bottomless cylindrical inner label member 60a provided in close contact with the outer side of the preform 10a, and an inner label member 60a. And a bottomless cylindrical plastic member 40a provided in close contact with the outside.

  The inner label member 60a is in close contact with the outer surface of the preform 10a, and is in close contact with the preform 10a without being moved or rotated easily, or in close contact with the preform 10a so as not to fall by its own weight. 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 previously designed or printed. For example, in addition to the design and product name, 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 images and characters on the composite container 10A without separately providing 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 trunk portion 20a of the preform 10a, and images and characters may be displayed on the trunk portion 20 of the container body 10 after molding. This eliminates the need for a labeling process using a labeler after the container is tightly sealed, so that the manufacturing cost can be suppressed and the yield can be prevented from decreasing.

  As such an inner label member 60a, a film made of a polyester resin, a polyamide resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, a fluorine resin, a blended material thereof, or the like is used. Can do. The inner label member 60a may be made of the same material as the container body 10 (preform 10a) and / or the plastic member 40a, or may be made of a different material.

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

  For example, the inner label member 60a may be made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, without using a multi-layer preform or a preform containing a blend material as the preform 10a, the gas barrier property of the composite container 10A is improved, oxygen is prevented from entering the container, and the content liquid is prevented from deteriorating. In addition, it is possible to prevent the evaporation of water vapor from the inside of the container to the outside and to prevent the internal volume from decreasing. Such materials include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), EVOH (ethylene vinyl alcohol copolymer), PEN (polyethylene naphthalate) or oxygen such as fatty acid salts in these materials. It is also possible to mix an absorbent material.

  Further, the inner label member 60a may be made of a material having light barrier properties such as ultraviolet rays. In this case, the light barrier property of the composite container 10A can be improved and the content liquid can be prevented 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. 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.

  Moreover, the inner label member 60a may be made of a material (a material having a low thermal conductivity) having a higher heat retaining property or a lower heat retaining property than a 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. Thereby, the heat retaining property or cold retaining property of the composite container 10A is enhanced. Examples of such a material include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. It is preferable that the inner label member 60a further includes hollow particles. The average particle diameter of the hollow particles is preferably 1 to 200 μm, and more preferably 5 to 80 μm. The hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include the same ones as described above. Moreover, the said commercially available hollow particle can also be used. As content of a hollow particle, it is preferable that it is 0.01-50 mass parts with respect to 100 mass parts of resin contained in the inner side label member 60a, and it is more preferable that it is 1-20 mass parts.

  On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without being bonded, and is in close contact with the preform 10a so that it does not move or rotate, or close enough not to fall by its own weight. Has been. 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 region excluding the portion 13a corresponding to the neck portion 13 of the container body 10 in the trunk portion 20a.

  The inner label member 60a and the plastic member 40a may be provided in the entire region or a partial region other than the mouth portion 11a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body portion 20a including the neck portion 13. Furthermore, the inner label member 60a and the plastic member 40a are not limited to one, and a plurality of inner label members 60a and plastic members 40a may be provided. For example, the two inner label members 60a and the plastic member 40a may be provided at two locations on the outer side of the body portion 20a.

  The plastic member 40a has a function of contracting with respect to the preform 10a (contracting tube), and the plastic member (contracting tube) 40a has a function of contracting with respect to the preform 10a. If there is no particular limitation. The plastic member (shrinkable tube) 40a is preferably a member that contracts (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 in the first embodiment described above, detailed description thereof is omitted here.

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

As shown in FIG. 11, the plastic member 40a (inner label member 60a) preferably has a bottomless cylindrical shape as a whole and has a cylindrical body 41 (body 61).
In this case, various functions and characteristics can be imparted to the composite container 10A.

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

  First, a preform 10a made of a plastic material is prepared (see FIG. 12A).

  Next, an inner label member 60a is provided outside the preform 10a, and a plastic member (shrinkable tube) 40a is provided outside the inner label member 60a (see FIG. 12B). The inner label member 60a and the plastic member (shrinkable tube) 40a are mounted so as to cover the entire region excluding the portion corresponding to the neck portion 13 of the container body 10 in the trunk portion 20a. This plastic member (shrinkable tube) 40a may be at least partially translucent or transparent.

  In this case, a plastic member (shrinkable tube) 40a is provided around the inner label member 60a in advance, and the inner label member 60a and the plastic member (shrinkable tube) 40a are integrally attached to the outside of the preform 10a. Also good. Alternatively, the inner label member 60a may be provided outside the preform 10a, and then the plastic member (shrinkable tube) 40a may be provided outside the inner label member 60a.

  Next, the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a are heated by the heating device 51 (see FIG. 12C). At this time, the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a are 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, the inner label member 60a, and the plastic member (shrinkable tube) 40a in this heating step may be 90 ° C. to 130 ° C., for example.

  In this way, the plastic member (shrinkable tube) 40a is heated, so that the plastic member (shrinkable tube) 40a is thermally contracted and closely contacts the outer side of the preform 10a (see FIG. 12C). When the plastic member (shrinkable tube) 40a itself has shrinkability, the plastic member (see FIG. 12 (b)) when the plastic member (shrinkable tube) 40a is provided outside the inner label member 60a (see FIG. 12B). (Shrinkable tube) 40a may be in close contact with the outer side of the inner label member 60a.

  Subsequently, the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 12D).

  The preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a are molded using this blow molding die 50, and in substantially the same manner as in FIGS. 12 (a) to (f) described above, A composite container 10A including the container body 10, an inner label member 60a provided on the outer surface of the container body 10, and a plastic member (shrinkable tube) 40 provided outside the inner label member 60a is obtained (FIG. 12 (d) to (f)).

  Next, with reference to FIGS. 13A to 13G, another modification of the method (blow molding method) for manufacturing the composite container 10A according to the present embodiment will be described. The modification shown in FIGS. 13A to 13G heats the preform 10a and the plastic member (shrinkable tube) 40a in two stages, and other configurations are shown in FIGS. 12A to 12F. ). 13A to 13G, the same parts as those in FIGS. 12A to 12F are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, a preform 10a made of a plastic material is prepared (see FIG. 13A).

  Next, an inner label member 60a is provided outside the preform 10a, and a plastic member (shrinkable tube) 40a is provided outside the inner label member 60a (see FIG. 13B). The plastic member (shrinkable tube) 40a is mounted so as to cover the entire area of the body portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10. At least a part of the plastic member (shrinkable tube) 40a may be translucent or transparent.

  In this case, a plastic member (shrinkable tube) 40a is provided around the inner label member 60a in advance, and the inner label member 60a and the plastic member (shrinkable tube) 40a are integrally attached to the outside of the preform 10a. Also good. Alternatively, the inner label member 60a may be provided outside the preform 10a, and then the plastic member (shrinkable tube) 40a may be provided outside the inner label member 60a.

  Next, the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a are heated by the first heating device 55 (see FIG. 13C). At this time, the heating temperature of the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a may be 50 ° C. to 100 ° C., for example.

  When the plastic member (shrinkable tube) 40a is heated, the plastic member (shrinkable tube) 40a is thermally shrunk and adheres to the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a, the inner label member 60a in close contact with the outer side of the preform 10a, and the plastic member (shrinkable tube) 40a in close contact with the outer side of the inner label member 60a is obtained. (See FIG. 13C).

  Thus, by using the first heating device 55, the plastic member (shrinkable tube) 40a is heated and adhered to the outside of the preform 10a and the inner label member 60a in advance, and the composite preform 70 is produced. A series of steps for producing the composite preform 70 (FIGS. 13A to 13C) and a series of steps for producing the composite container 10A by blow molding (FIGS. 13D to 13G) are separated. It becomes possible to carry out at the place (factory etc.).

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 13D). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 13E).

  The composite preform 70 is molded using the blow mold 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 above-described FIGS. 12 (a) to 12 (f). The composite container 10A including the inner label member 60 and the plastic member (shrinkable tube) 40 provided outside the inner label member 60 is obtained (see FIGS. 13E to 13G).

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

  Moreover, according to this Embodiment, the preform 10a (container main body 10) and the plastic member 40a (plastic member 40) can be comprised from another member. 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 is necessary to prepare a new molding equipment for manufacturing the composite container 10A. Absent.

Claims (1)

In the manufacturing method of the composite container,
Preparing a preform made of plastic material;
Providing a plastic member on the outside of the preform;
Heating the preform and the plastic member and inserting it into a blow mold; and
A step of blow-molding the preform and the plastic member in the blow-molding mold to inflate the preform and the plastic member together,
The method for producing a composite container, wherein the plastic member is a shrinkable tube composed of multiple layers.

Images