JP6489415B2 - Manufacturing method of composite container, composite preform, composite container, inner label member, and plastic member - Google Patents

Description

  The present invention relates to a method for manufacturing a composite container, a composite preform, a composite container, an inner label member, 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.

JP 2009-241526 A

  The present invention has been made in view of the above points, and a composite container manufacturing method, composite composite, capable of easily manufacturing a composite container having various functions and characteristics such as gas barrier properties. An object is to provide a reform, a composite container, an inner label member, and a plastic member.

  In the method for manufacturing a composite container, the present invention includes a step of preparing a preform made of a plastic material, and a cylindrical body and an opening having a width of more than 0 mm and 3 mm or less are provided outside the preform. A step of providing a plastic member having a bottom portion, and a step of inflating the preform and the plastic member integrally by performing blow molding on the preform and the plastic member, The opening is a method for manufacturing a composite container, which is closed after blow molding.

  The present invention further includes a step of providing an inner label member so as to surround the outer side of the preform, and the plastic member is provided on the outer side of the inner label member. .

  In the method for manufacturing a composite container, the present invention includes a step of preparing a preform made of a plastic material, and a cylindrical body and an opening having a width of more than 0 mm and 3 mm or less are provided outside the preform. A step of providing an inner label member having an open bottom, a step of providing a plastic member outside the inner label member, and blow molding the preform, the inner label member and the plastic member. The preform, the inner label member, and the plastic member are expanded as a unit, and the opening is closed after blow molding.

  In the composite preform, a preform made of a plastic material, a cylindrical body, and an opening having a width of more than 0 mm and 3 mm or less are provided so as to surround the outside of the preform. And a plastic member having a bottom, wherein the plastic member is in close contact with the outside of the preform.

  The present invention further includes an inner label member provided in close contact so as to surround the outer side of the preform, and the plastic member is provided in close contact with the outer side of the inner label member. It is a composite preform.

  The present invention provides a composite preform, in which a preform made of a plastic material and a cylindrical body and an opening having a width of more than 0 mm and not more than 3 mm are provided so as to surround the outside of the preform. An inner label member having a bottom portion provided, and a plastic member provided so as to surround the outer side of the inner label member, the plastic member being in close contact with the outer side of the preform and the inner label member It is a composite preform characterized by being made.

  The present invention is a composite container produced by the method for manufacturing a composite container.

  The present invention is a plastic member that is mounted so as to surround the outside of the preform, the tubular body covering the body of the preform, the bottom of the preform, and a width of 0 mm. And a bottom part provided with an opening that is 3 mm or less.

  The present invention is an inner label member that is mounted so as to surround the outer side of a preform and is mounted on the inner side of a plastic member, and includes a cylindrical body portion that covers the body portion of the preform, and the preform. It is an inner label member characterized by having a bottom portion that covers the bottom portion of the reform and has an opening having a width of more than 0 mm and not more than 3 mm.

  According to the present invention, since the opening having a width exceeding 0 mm and not more than 3 mm is provided at the bottom of the plastic member, the operation of attaching the plastic member to the preform is facilitated. Thereby, the composite container provided with various functions and characteristics, such as gas barrier property, can be manufactured easily.

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 partial vertical sectional view showing the composite preform according to the first embodiment of the present invention. 4A to 4E are schematic views showing a method for producing a plastic member that is a direct blow-molded product. FIGS. 5A to 5F are schematic views showing a method of manufacturing the composite container according to the first embodiment of the present invention. FIG. 6 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 7 is a horizontal sectional view (sectional view taken along line VII-VII in FIG. 6) showing the composite container according to the second embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a composite preform according to the second embodiment of the present invention. FIGS. 9A to 9F are schematic views showing a method for manufacturing a composite container according to 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 5 are views showing a first embodiment of the present invention.

  First, an outline of a composite container produced by the composite container manufacturing method (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 is biaxially stretched with respect to a composite preform 70 (see FIG. 3) including a preform 10a and a plastic member 40a using a blow molding die 50, as will be described later. By performing blow molding, 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, And 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 main body 10 in a thinly extended state, and is attached to the container main body 10 without being easily moved or rotated.

  Next, the container body 10 will be described in detail. 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 includes 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 about 50 micrometers-250 micrometers (50 micrometers or more and 250 micrometers or less. The same applies hereafter). 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. 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. Moreover, you may blend and use the various resin mentioned above. 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 shape | molding the preform 10a which consists of 3 or more layers as resin which 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.

  Such a container main body 10 may consist of a bottle with a full capacity of 100 ml to 2000 ml, for example. 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, and is obtained by being in close contact with the outside of the preform 10a and then being biaxially stretch blow-molded together with the preform 10a. It is a thing. As will be described later, the plastic member 40 is produced by stretching a plastic member 40a together with the preform 10a.

  The plastic member 40 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 as not to move or rotate. 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.

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

  On the other hand, since the plastic member 40 is not welded or bonded 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 using a blade or the like, or a cutting line (not shown) may be provided in advance on the plastic member 40, and the plastic member 40 may be peeled along the cutting line. it can. Thereby, the plastic member 40 can be separated and removed from the container body 10.

  The thickness of the plastic member 40 is not limited to this, but can be set to, for example, about 5 μm to 500 μm in a state of being attached to the container body 10. In order to reliably close the opening 44 of the plastic member 40a described later, the thickness of the plastic member 40 is preferably set to 30 μm to 500 μm.

  In the present embodiment, the plastic member 40 may be colored in a visible light color such as red, blue, yellow, green, brown, black, and white. The plastic member 40 may be (semi) transparent or opaque. In this case, for example, the plastic member 40 may be colored with visible light and the container body 10 may be colorless and transparent. Alternatively, both the container body 10 and the plastic member 40 may be colored in a visible light color. When producing the plastic member 40 colored in visible light color, a visible light color pigment may be added to the molding material in the step of producing the plastic member 40a before blow molding by injection molding or the like. .

  Next, the structure of the composite preform according to this 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 outside the preform 10a.

  The preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. Of these, the mouth portion 11 a corresponds to the mouth portion 11 of the container body 10 described above, and has substantially the same shape as the mouth portion 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 40a is attached to the outer surface of the preform 10a without being bonded, and is in close contact with the preform 10a so as not to move or rotate, or in close contact with the preform 10a so as not to fall by its own weight. . The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

  In this case, the plastic member 40a is provided so as to cover the entire region of the body portion 20a excluding the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a. Moreover, the plastic member 40a may be colored in visible light colors such as red, blue, yellow, green, brown, black, and white.

  The plastic member 40a may be provided in the entire region or a partial region other than the mouth portion 11a. For example, the plastic member 40a may be provided so as to cover the neck portion 13a, the trunk portion 20a, and the bottom portion 30a except for the mouth portion 11a. Furthermore, the number of 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 outside the trunk portion 20a.

  In FIG. 3, the plastic member 40 a has a cylindrical body portion 41 and a hemispherical bottom portion 42, and an opening 44 (air hole) is provided in the bottom portion 42. In this case, the opening 44 may be provided at one center of the bottom portion 42 (see FIG. 3), or may be provided at a plurality of locations including the center of the bottom portion 42 and the periphery thereof. The position and number of the openings 44 are not limited to this.

  In addition, the shape of each opening 44 may be a circular shape, a rectangular shape, an elliptical shape, a rounded rectangular shape, a rhombus shape, a triangular shape, a pentagonal shape, an arrow blade shape, a hexagonal shape, or the like. Further, the width (diameter) of the opening 44 is more than 0 mm and 3 mm or less. In this specification, the width of the opening 44 refers to the length of the longest portion of the opening 44 when viewed from the bottom surface direction (downward in FIG. 3) (the opening of the inner label member 60a described later). The same applies to 64). Specifically, when the shape of the opening 44 is circular, the width of the opening 44 is the diameter of the opening 44, and when the shape of the opening 44 is rectangular, the width of the opening 44 is a diagonal line of the opening 44. Is the length of

  Thus, by providing the opening 44 in the bottom portion 42 of the plastic member 40a, when the bottomed plastic member 40a is fitted into the preform 10a (see FIG. 5B), the opening 44 is an air escape path. Therefore, the plastic member 40a can be smoothly attached to the preform 10a.

  On the other hand, since the width (diameter) of the opening 44 is 3 mm or less, after the plastic member 40a is blow-molded, the opening 44 is closed along with the expansion of the plastic member 40a (at least not visually confirmed). ). For this reason, there is little possibility that functions, such as gas barrier property with respect to the bottom part 30 of the container main body 10, and light barrier property, will be impaired by presence of the opening 44.

  The plastic member 40a may be a direct blow molded product manufactured by a direct blow molding method. Hereinafter, a method for manufacturing the plastic member 40a by the direct blow molding method will be described.

  The plastic member 40a which is a direct blow-molded product includes a step of heating and melting a resin material, a step of extruding the heated and melted resin material to form a tubular parison, and air in the tubular parison in a mold. And a step of blow molding a tube-shaped parison in accordance with the shape of the mold (direct blow molding method).

  Specifically, the plastic member 40a can be manufactured by the method shown in FIGS. Hereinafter, a method for manufacturing the plastic member 40a will be described with reference to FIGS.

  First, as shown in FIG. 4A, the resin material 74 is heated and melted using an extruder 73. Next, this heated and melted resin material 74 is extruded from the die 75 of the extruder 73 into a tube shape, thereby forming a tube-shaped parison 76.

  Next, as shown in FIG. 4B, for example, a two-part mold (direct blow mold) 77 is closed to sandwich the tubular parison 76 extruded from the die 75.

  As shown in FIG. 4B, the mold 77 includes a mold body 77a and a cavity 77b formed inside the mold body 77a and having a shape corresponding to the outer shape of the preform 10a. Yes. A mold opening 77c communicating with the cavity 77b is formed at a position (parting surface) corresponding to the bottom 42 of the preform 10a in the mold body 77a. A substantially spherical buffer space 77d communicates with the mold opening 77c. As will be described later, the buffer space 77d is provided to form the opening 44 by reliably flowing air into the thin mold opening 77c when air is blown into the tubular parison 76 from the blowing nozzle 78. Yes. Depending on the shape and size of the opening 44, the buffer space 77d may not necessarily be provided.

  Next, as shown in FIG. 4C, air is blown into the tubular parison 76 from the blow nozzle 78. Thereby, the tubular parison 76 is shaped according to the shape of the cavity 77 b of the mold 77. Next, the shaped tubular parison 76 is cooled.

  Thereafter, the mold 77 is opened to obtain an intermediate 47 formed by direct blow molding as shown in FIG. The intermediate body 47 is obtained by shaping a tubular parison 76, and has a plastic member 40a and a burr 48 connected to the bottom 42 of the plastic member 40a. Among these, the burr 48 is formed by sandwiching a part of the tube-shaped parison 76 by the mold 77. Inside the burr 48, a communication hole 48a that communicates with the opening 44 and a substantially spherical cavity 48b that extends from the communication hole 48a and communicates with the communication hole 48a are formed. The communication hole 48a and the cavity 48b have shapes corresponding to the mold opening 77c and the buffer space 77d of the mold 77 described above, respectively.

  Thereafter, as shown in FIG. 4E, the burr 48 of the intermediate body 47 is physically removed to obtain a bottomed cylindrical plastic member 40a. In the plastic member 40a, an opening 44 having a width exceeding 0 mm and not more than 3 mm is formed in the bottom portion 42.

  Thus, by providing the mold opening 77 c in the mold 77, the opening 44 is formed at the same time when the plastic member 40 a is manufactured. In this case, there is no need to separately drill the bottom portion 42 of the plastic member 40a. However, the present invention is not limited to this, and the opening 44 may be formed by perforating the bottom portion 42 of the plastic member 40a using, for example, a needle-like protrusion.

  The plastic member 40a is not limited to the direct blow molded product (blow tube) described above, and may be, for example, a sheet molded tube manufactured by sheet molding or an injection molded tube manufactured by injection molding. .

  Examples of the plastic member 40a include polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, Polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluorine resin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, Ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluoro rubber, nylon 6, nylon 6,6, nylon MXD6, aromatic poly Polycarbonate, poly (ethylene terephthalate), poly (ethylene terephthalate), poly (ethylene naphthalate), U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene Examples thereof include sulfide, polyethersulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, and epoxy resin. Among these, it is preferable to use thermoplastic inelastic resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Moreover, those blend materials, multilayer structures, and partial multilayer structures may be used. Furthermore, various additives other than the main component resin may be added to the material of the plastic member 40a 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, An oxidizing agent, an ion exchange agent, a coloring pigment, and the like can be added. Also, by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, a foam member having a foam cell diameter of 0.5 to 100 μm is used, and this foam preform is molded. , The light shielding property can be improved.

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

  The plastic member 40a may be made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, without using a multi-layer preform or a preform containing a blend material as the preform 10a, 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, a plastic member 40 may be provided in the entire region of the shoulder portion 12, the neck portion 13, the trunk portion 20, and the bottom portion 30 of the container body 10, and the gas barrier property of this portion may be improved. Examples of such materials include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), and oxygen such as fatty acid salts in these materials. It is also possible to mix an absorbent material.

  The plastic member 40a may be made of a material having a light barrier property 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, the trunk portion 20, and the bottom portion 30 of the container body 10 to enhance the ultraviolet barrier property of this portion. 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, 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.

  Further, the plastic member 40a may be made of a material having a higher cold insulation property (a material having a low thermal conductivity) than the plastic material constituting the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. Thereby, the cool property of 10 A of composite containers is improved. 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 improve the cold insulation of the body 20. Further, when the user grips the composite container 10A, it is prevented that the composite container 10A becomes difficult to hold due to being too cold. 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 a resin material containing these resins. 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. 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 materials contained in the plastic members 40a, and it is more preferable that it is 1-20 mass parts.

  The plastic member 40a may be made of a material that is less slippery than the plastic material that constitutes the container body 10 (preform 10a). In this case, the 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.

  The plastic member 40a may be preliminarily printed with design or printing. In this case, the printing may be formed by designing or printing the plain plastic member 40a by a printing method such as an inkjet method or a gravure printing method. This printing may be performed on the plastic member 40a before being attached to the preform 10a, or may be performed in a state where the plastic member 40a is provided outside the preform 10a. The plastic member 40a may be colored in colors such as red, blue, yellow, green, brown, black, and white, and may be transparent or opaque.

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

  As shown in FIG. 3, the plastic member 40 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, various functions and characteristics such as gas barrier properties are imparted to the bottom portion 30 in addition to the trunk portion 20 of the composite container 10A. be able to.

  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. 5A). In this case, for example, the preform 10a may be manufactured by an injection molding method using an unillustrated injection molding machine. Moreover, you may use the preform generally used conventionally as the preform 10a.

  Next, the plastic member 40a is prepared. The plastic member 40a may be, for example, a direct blow molded product. In this case, the plastic member 40a may be manufactured by the method shown in FIGS. 4 (a) to 4 (e). The plastic member 40 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41.

  Next, by providing a plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is manufactured (FIG. 5 ( b)).

  In the present embodiment, a plastic member 40a having an inner diameter that is the same as or slightly smaller than the outer diameter of the preform 10a is pressed into the preform 10a to be brought into close contact with the outer surface of the preform 10a. In this case, an opening 44 (air hole) having a width exceeding 0 mm and not more than 3 mm is provided in the bottom portion 42 of the plastic member 40a, so that air existing between the plastic member 40a and the preform 10a can be removed. , Escape from the opening 44 outward. Thereby, the plastic member 40a can be smoothly fitted into the preform 10a.

  In this way, a series of steps for producing the composite preform 70 (FIGS. 5A to 5B) are performed by previously bringing the plastic member 40a into close contact with the outside of the preform 10a and producing the composite preform 70. )) And a series of steps (FIGS. 5 (c) to 5 (f)) for producing the composite container 10A by blow molding can be performed at different places (factories, etc.).

  Next, the composite preform 70 is heated by the heating device 51 (see FIG. 5C). At this time, the composite preform 70 is 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 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

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

  The composite container 10 </ b> A is molded using this blow molding die 50. In this case, the blow mold 50 is composed of a pair of body molds 50a and 50b and a bottom mold 50c which are divided from each other (see FIG. 5D). In FIG. 5 (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. 5E, after the bottom mold 50c is lowered, the pair of body molds 50a, 50b is closed, and sealed by the pair of body molds 50a, 50b and the bottom mold 50c. A blow mold 50 is formed. 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. In this case, since the width of the opening 44 is more than 0 mm and 3 mm or less, the plastic member 40a is stretched and expanded by blow molding, and the opening 44 is closed.

  Next, as shown in FIG. 5 (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.

  Thus, according to the present embodiment, since the opening 44 is provided in the bottom portion 42 of the plastic member 40a before blow molding, it is easy to attach the plastic member 40a to the preform 10a. Become. Thereby, 10 A of composite containers provided with various functions and characteristics, such as gas barrier property, can be manufactured easily.

  Further, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded as a unit, A composite container 10A including the container body 10 and the plastic member 40 is produced. 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.

  Furthermore, according to the present embodiment, when producing the composite container 10A, a general blow molding apparatus can be used as it is, so that it is necessary to prepare a new molding facility for producing 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 FIGS. 6 to 9 are views showing a second embodiment of the present invention. 6 to 9, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, the outline | summary of the composite container by this Embodiment is demonstrated with FIG. 6 and FIG.

  The composite container 10A shown in FIGS. 6 and 7 is formed into a composite preform 70 (see FIG. 8) 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 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 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. Yes.

  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).

  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 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. 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, the trunk portion 20, and the bottom portion 30 of the container body 10 except for the mouth portion 11 and the neck portion 13. Thereby, desired characters, images, and the like can be imparted to the shoulder portion 12, the body portion 20, and the bottom portion 30 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 the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10 except the mouth portion 11. 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.

  Further, the thickness of the inner label member 60 is not limited to this, but can be set to, for example, about 1 μm to 100 μm in a state of being attached to the container body 10.

  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 structure of the composite preform according to this embodiment will be described with reference to FIG.

  As shown in FIG. 8, the composite preform 70 includes a plastic material preform 10a, 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. And 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 so that it does not easily move or rotate, or is in close contact with the preform 10a so that it does not fall off due to 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, an unstretched film such as polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate resin, polyacetal resin, or fluorine resin can be used. 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.

  In FIG. 8, the inner label member 60 a has a cylindrical body portion 61 and a hemispherical bottom portion 62, and the bottom portion 62 is provided with an opening 64 (air hole). The width (diameter) of the opening 64 exceeds 0 mm and is 3 mm or less. Thus, by providing the opening 64 at the bottom of the inner label member 60a, when the bottomed inner label member 60a is fitted into the preform 10a (see FIG. 9B), the opening 64 serves as an air escape path. Therefore, the inner label member 60a can be smoothly attached to the preform 10a.

  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 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 and the bottom portion 30a except for the mouth portion 11a. 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.

  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, 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. 9A).

  Next, an inner label member 60a is provided outside the preform 10a, and a plastic member 40a is provided outside the inner label member 60a. Thus, 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 40a in close contact with the outer side of the inner label member 60a is produced (FIG. 9). (See (b)). In this case, the inner label member 60 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body portion 61 and a bottom portion 62 connected to the body portion 61.

  At this time, the inner label member 60a and the plastic member 40a having an inner diameter that is the same as or slightly smaller than the outer diameter of the preform 10a are pressed into the preform 10a to be brought into close contact with the outer surface of the preform 10a. In this case, since the openings 44 and 64 (air holes) are provided in the bottom portion 42 of the plastic member 40a and the bottom portion 62 of the inner label member 60a, respectively, the plastic member 40a and the inner label member 60a can be smoothly fitted. Can do. The openings 44 and 64 may be provided in only one of the plastic member 40a and the inner label member 60a.

  Alternatively, a plastic member 40a may be provided around the inner label member 60a in advance, 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 outside the preform 10a, and then the plastic member 40a may be provided outside the inner label member 60a.

  In this way, a series of steps for producing the composite preform 70 by previously bringing the plastic member 40a into close contact with the outside of the preform 10a and the inner label member 60a and producing the composite preform 70 (FIG. 9 ( a) to (b)) and a series of steps (FIGS. 9 (c) to (f)) for producing the composite container 10A by blow molding can be performed at different places (factories, etc.).

  Next, the composite preform 70 is heated by the heating device 51 (see FIG. 9C).

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow mold 50. The composite container 10A is molded using this blow molding die 50, and is substantially the same as in the case of the first embodiment described above, and the container body 10 and the inner label member provided on the outer surface of the container body 10. 60 and the composite container 10A provided with the plastic member 40 provided outside the inner label member 60 is obtained (see FIGS. 9D to 9F). In this case, since the widths of the openings 44 and 64 are each greater than 0 mm and 3 mm or less, the openings 44 and 64 are closed by the plastic member 40a being stretched and expanded by blow molding.

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

DESCRIPTION OF SYMBOLS 10 Container main body 10A Composite container 10a Preform 11, 11a Mouth part 12 Shoulder part 13 Neck part 14 Thread part 17 Flange part 20, 20a Body part 30, 30a Bottom part 40, 40a Plastic member 41 Body part 42 Bottom part 44 Opening 50 Blow molding Mold 60, 60a Inner label member 61 Body 62 Bottom 64 Opening 70 Composite preform

Claims (8)

In the manufacturing method of the composite container,
Preparing a preform made of a plastic material having a cylindrical body and a bottom; and
Provided on the outside of the preform is a plastic member having a cylindrical body and a bottom having a width exceeding 0 mm and not more than 3 mm and having a shape conforming to the shape of the bottom of the preform. Process,
A step of blow molding the preform and the plastic member to expand the preform and the plastic member integrally;
The method for manufacturing a composite container, wherein the opening is closed after blow molding. A step of providing an inner label member so as to surround the outside of the preform;
The method for manufacturing a composite container according to claim 1, wherein the plastic member is provided outside the inner label member. In the manufacturing method of the composite container,
Preparing a preform made of plastic material;
Providing an inner label member having a cylindrical body and a bottom provided with an opening having a width of more than 0 mm and not more than 3 mm on the outside of the preform;
Providing a plastic member outside the inner label member;
And inflating the preform, the inner label member and the plastic member together by performing blow molding on the preform, the inner label member and the plastic member,
The method for manufacturing a composite container, wherein the opening is closed after blow molding. In composite preform,
A preform made of a plastic material having a cylindrical body and a bottom ;
Provided so as to surround the outside of the preform, and has a cylindrical body portion, and an opening having a width of more than 0 mm and not more than 3 mm, and a bottom portion having a shape that follows the shape of the bottom portion of the preform. A plastic member,
The composite preform, wherein the plastic member is in close contact with the outside of the preform. An inner label member provided in close contact so as to surround the outside of the preform;
The composite preform according to claim 4, wherein the plastic member is provided in close contact with the outside of the inner label member. In composite preform,
A preform made of plastic material,
An inner label member provided in close contact so as to surround the outer side of the preform, and having a cylindrical body portion and a bottom portion provided with an opening having a width of more than 0 mm and not more than 3 mm;
A plastic member provided so as to surround the outside of the inner label member,
The composite preform, wherein the plastic member is in close contact with the outside of the preform and the inner label member. A plastic member that is mounted so as to surround the outside of the preform,
A cylindrical body covering the body of the preform;
A plastic member characterized by having a bottom portion that covers the bottom portion of the preform, has an opening having a width of more than 0 mm and not more than 3 mm, and has a shape that follows the shape of the bottom portion of the preform . An inner label member that is mounted so as to surround the outside of the preform and that is mounted on the inner side of the plastic member,
A cylindrical body covering the body of the preform;
An inner label member having a bottom portion which covers a bottom portion of the preform and has an opening having a width of more than 0 mm and not more than 3 mm.

Images