JP2017109452A - Production method of composite preform, and production method of composite container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a highly sanitary composite preform and a composite container.SOLUTION: A production method of a composite preform includes steps for: preparing a preform made of a plastic material; mounting a plastic member containing an active ray crosslinkable resin on the preform so as to enclose the outside of the preform; and crosslinking the active ray crosslinkable resin by irradiating an active ray to the plastic member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a composite preform and a method for manufacturing a composite container.

  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).

  In the previous application (Japanese Patent Application Laid-Open No. 2015-128858), the present applicant has proposed a composite container capable of imparting various functions and characteristics to the container.

JP2015-128858A

Since the said composite container accommodates food-drinks etc., high hygiene is requested | required.
However, the composite container disclosed in Cited Document 1 is manufactured by fitting a plastic member into a preform and blow-molding the plastic member. The composite container is stored during fitting or storage until blow-molding. It has been found that there is a possibility that bacteria and the like may be generated between the reform and the plastic member, and there is room for improvement in the hygiene.

  This invention is made | formed based on the knowledge which concerns, The objective is to provide the method which can manufacture a composite preform and composite container with higher hygiene.

The method for producing the composite preform of the present invention comprises:
Preparing a preform made of plastic material;
Attaching a plastic member containing an actinic ray crosslinkable resin to the preform so as to surround the outside of the preform;
Irradiating a plastic member with actinic rays to crosslink the actinic ray crosslinkable resin.

  In the embodiment of the present invention, the actinic ray is preferably γ-ray.

  In the embodiment of the present invention, the dose of γ rays is preferably 5 to 100 kGy.

  In the embodiment of the present invention, the plastic member preferably contains a crosslinking agent and / or a crosslinking aid.

The method for producing the composite container of the present invention comprises:
Heating the composite preform obtained by the above method and inserting it into a blow mold; and
And a step of expanding the preform and the plastic member together by performing blow molding on the composite preform after heating.

According to the present invention, a composite preform and a composite container with higher hygiene can be produced.
Furthermore, since the plastic preform provided in the composite preform and composite container produced according to the present invention comprises a resin material cross-linked by actinic rays, the plastic member is transparent and the composite container is scratch resistant and heat resistant. Can be improved. Moreover, since the slip agent used at the time of conveyance of a production line is an alkaline chemical | medical agent, a normal PET bottle etc. will be decomposed | disassembled and there exists a possibility of a color change or damage. Since the plastic member provided in the composite container and composite preform according to the present invention has high chemical resistance, such a problem can be solved.

FIG. 1 is a vertical cross-sectional view showing a composite preform according to an embodiment. FIG. 2 is a vertical cross-sectional view illustrating a composite preform according to one embodiment. FIG. 3 is a vertical cross-sectional view showing a composite preform according to an embodiment. FIG. 4 is a vertical cross-sectional view illustrating a composite preform according to one embodiment. FIG. 5 is a partial vertical sectional view showing a composite container according to an embodiment. FIG. 6 is a partial vertical sectional view showing a composite container according to an embodiment. FIG. 7 is a partial vertical sectional view showing a composite container according to an embodiment. FIG. 8 is a partial vertical sectional view showing a composite container according to an embodiment. 9 is a horizontal sectional view of the composite container shown in FIG. 5 taken along the line IX-IX. FIG. 10 is a horizontal sectional view of the composite container shown in FIG. FIG. 11 is a perspective view showing a plastic member. FIG. 12 is a perspective view showing a plastic member and an inner label member. FIG. 13 is a schematic diagram illustrating a method for manufacturing a composite container according to an embodiment. FIG. 14 is a schematic view illustrating a method for manufacturing a composite container according to an embodiment. FIG. 15 is a schematic view illustrating a method for manufacturing a composite container according to an embodiment. FIG. 16 is a schematic view illustrating a method for manufacturing a composite container according to an embodiment.

Manufacturing method of composite preform The manufacturing method of the composite preform according to the present invention includes:
Preparing a preform made of plastic material;
Attaching a plastic member containing an actinic ray crosslinkable resin to the preform so as to surround the outside of the preform;
Irradiating a plastic member with an actinic ray and crosslinking the actinic ray crosslinkable resin.
Moreover, the process of providing an inner label member between preform and a plastic member may be included if desired.

Composite Preform As shown in FIG. 1, in one embodiment, a composite preform 70 includes a plastic material preform 10a and a bottomed cylindrical plastic member 40a provided outside the preform 10a. I have. In one embodiment, as shown in FIG. 2, the plastic member 40a may be a bottomless cylindrical member.
3 and 4, an inner label member 60a may be provided between the preform 10a and the plastic member 40a.

  The composite preform 70 is subjected to biaxial stretch blow molding, and the preform 10a of the composite preform 70 and the plastic member 40a (inner label member 60a if desired) are inflated as a unit, so that FIGS. The composite container 10A shown can be obtained.

Composite Container As shown in FIGS. 5 and 6, the composite container 10 </ b> A includes a container body 10 made of a plastic material positioned inside and a plastic member 40 provided in close contact with the outside of the container body 10. Yes. As shown in FIGS. 7 and 8, the composite container 10 </ b> A may include an inner label member 60 between the container body 10 and the plastic member 40.

  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. 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. 5 and the like), respectively.

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

  The neck portion 13 is located between the flange portion 17 and the shoulder portion 12 and has a substantially cylindrical shape having a substantially uniform diameter. 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.

  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. Furthermore, the weight of the container body 10 is not limited to this, but for example, when the container body 10 has an internal volume of 500 mL, it 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.

  The container main body 10 can be manufactured by biaxially stretch blow molding a preform 10a manufactured by injection molding of a resin material.

  In order to enhance the barrier property of the container, 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.

  The 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.

  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 without being easily moved or rotated. As shown in FIGS. 9 and 10, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has, for example, a substantially circular horizontal cross section.

  The plastic member 40 can be obtained by mounting the plastic member 40a on the preform 10a so as to surround the outside, and then biaxially stretching blow-molding together with the preform 10a.

As shown in FIGS. 5 and 7, in one embodiment, the plastic member 40 covers 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. Can be provided. With such a configuration, 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.
As shown in FIGS. 6 and 8, in one embodiment, the plastic member 40 covers the shoulder portion 12 and the trunk portion 20 of the container body 10 except for the mouth portion 11, the neck portion 13, and the bottom portion 30. Can be provided.

  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.

  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.

Further, since the plastic member 40 is not welded or bonded to the container body 10, it can be separated (separated) from the container body 10 and removed.
As a method of separating (peeling) the plastic member 40 from the container body 10, for example, the plastic member 40 is cut using a blade or the like, or a cutting line is provided in advance in the plastic member 40, and the cutting line is followed. Thus, the plastic member 40 can be peeled off.
When the plastic member 40 has heat shrinkability, the composite container 10A including the plastic member 40 and the container body 10 is replaced with a plurality of flakes including a small container body and a small plastic member. Each flake can be separated into a small piece container body and a small piece plastic member by pulverizing the flakes and immersing the plurality of flakes in hot water. Separation of the small container body and the small plastic member occurs due to the heat shrinkage of the plastic member 40 and the difference in specific gravity between them. Further, the separated small container body and the small plastic member are separately collected.
Since the plastic member 40 can be separated and removed from the container body 10 by the method as described above, the colorless and transparent container body 10 can be recycled as in the conventional case.

  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. 10, 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.

As shown in FIG. 7, in one embodiment, the inner label member 60 is provided so as to cover the shoulder portion 12, the trunk portion 20, and the bottom portion 30 except for the mouth portion 11 and the neck portion 13 in the container body 10. it can.
As shown in FIG. 8, in one embodiment, 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 body 10. be able to.

  The inner label member 60 may be provided in the same area as the plastic member 40 or may be provided in a narrower area than the plastic member 40. In the latter case, the inner label member 60 is preferably completely covered by the plastic member 40.

  The inner label member 60 can be obtained by providing the inner label member 60a so as to surround the outer side of the preform 10a, and biaxially stretch blow molding integrally with the preform 10a and the plastic member 40a.

  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.

Process for Preparing Preform As shown in FIGS. 1 to 4, 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. ing. 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 preform 10a can be manufactured by injection-molding a resin material using a conventionally known apparatus.
As the resin material, it is preferable to use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PC (polycarbonate). Moreover, you may blend and use the various resin mentioned above.
In addition, the preform 10a may contain colorants such as red, blue, yellow, green, brown, black, and white. However, in consideration of ease of recycling, the preform 10a does not contain these colorants and is colorless. It is preferably transparent.

Moreover, the container main body 10 can be made into the multilayer molding bottle of 2 layers or more by producing the multilayer preform 10a of 2 layers or more by injection molding.
For example, the intermediate layer includes a resin (intermediate layer) having 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) A multilayer molded bottle having gas barrier properties, light-shielding properties, and the like can be obtained by molding a preform 10a composed of three or more layers as a layer made of As the intermediate layer, a resin blended with the various resins described above 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.

Step of Mounting Plastic Member The method of the present invention includes a step of mounting a plastic member 40a comprising an actinic ray crosslinkable resin on the preform 10a so as to surround the outside of the preform 10a.

As a method for mounting the plastic member 40a, for example, when the plastic member 40a has heat shrinkability, there is a method in which the plastic member 40a is loosely inserted outside the preform 10a and heated by a heating device. The heating temperature at this time can be set to 50 ° C. or higher and 100 ° C. or lower.
When the plastic member 40a does not have heat shrinkability, the plastic member 40a can be mounted by fitting a plastic member 40a having an inner diameter that is the same as or slightly larger than the outer diameter of the preform 10a.

  The plastic member 40a is attached to the outer surface of the preform 10a without being bonded. 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.

  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 entire body 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.

The plastic member 40a may be a single layer or a multilayer.
In the case where the plastic member 40a is composed of multiple layers, for example, the materials constituting the layers of the innermost surface and the outermost surface may be the same or different.

As shown in FIGS. 11A and 12A, the plastic member 40a may have a bottomed cylindrical shape. In this case, the plastic member 40 a has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41.
Moreover, as shown in FIG.11 (b) and FIG.12 (b), the plastic members 40a may consist of bottomless cylindrical shapes.
Further, as shown in FIGS. 11 (c) and 11 (d) and FIGS. 12 (c) and 12 (d), the plastic member 40a is produced by forming a film into a cylindrical shape and bonding the ends thereof. The bottomless cylindrical shape may also be used. Moreover, the bottomed cylindrical shape produced by bonding this bottom part 42 may be used.

  The plastic member 40a includes a resin material (active light crosslinkable resin) that is cross-linked by irradiation with active light. Examples of the actinic ray crosslinkable resin include PE, PP, polystyrene, polyvinylidene fluoride, polymethyl acrylate, polyvinyl chloride, polybutadiene, natural rubber, vinyl alcohol, and polyamide resin. Among these, PE and PP are preferable. The content of the actinic ray crosslinkable resin in the plastic member 40a is preferably 95 to 100% by mass, and more preferably 98 to 100% by mass.

  Further, the plastic member 40a is a resin that is not crosslinked by irradiation with actinic rays, for example, polylactic acid, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, polychlorinated resin, as long as the characteristics are not impaired. Vinylidene, polyvinyl acetate, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluororesin, polymethyl methacrylate, polyacrylic acid, polyacrylonitrile, polyacrylamide, polybutene-1, nylon 6, nylon 6,6, nylon MXD6 , Aromatic polyamide, polycarbonate, ethylene polyterephthalate, polybutylene terephthalate, ethylene polynaphthalene, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, Saturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyether sulfone, silicone resin, polyurethane, phenol resins, urea resins, polyethylene oxide, polypropylene oxide, polyacetal, may contain an epoxy resin or the like.

  The plastic member 40a may include a copolymer obtained by polymerizing two or more monomer units constituting the above-described resin. Furthermore, the resin material may comprise two or more of the above-described resins. Moreover, those blend materials, multilayer structures, and partial multilayer structures may be used.

  The plastic member 40a preferably contains a crosslinking agent, and examples of the crosslinking agent include hexamethylenediamine carbamate, diortolyl guanidine, dicumyl peroxide, 1,3-phenylenebisoxazoline, and the like. .

  The content of the crosslinking agent is preferably 0.1 to 5 parts by mass, more preferably 0.1 to 2 parts by mass when the total amount of the actinic ray crosslinkable resin is 100 parts by mass. .

  The plastic member 40a preferably contains a crosslinking aid. Examples of the crosslinking agent include triallyl isocyanurate, triallyl cyanurate, diallyl fumarate, trimethylolpropane trimethacrylate, and trimethylolpropane triacrylate. Examples include acrylate and ethylene glycol dimethacrylate.

  The content of the crosslinking aid is preferably 0.1 to 5 parts by mass, more preferably 0.1 to 2 parts by mass when the total amount of the actinic ray crosslinkable resin is 100 parts by mass. preferable.

  Furthermore, the plastic member 40a 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.

  Moreover, the plastic member 40a may contain the same material as that contained in the preform 10a. In this case, in the composite container 10A, for example, the plastic member 40a can be disposed mainly on the portion where the strength is desired 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 materials include polyolefin resins such as PE and PP, polystyrene resins such as PS, and the like.

  The plastic member 40a may include 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. As such a material, PE, PP, MXD-6, PGA, EVOH, PEN, or an oxygen absorbing material such as a fatty acid salt may be mixed with these materials.

  The plastic member 40a may include 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 plastic member 40a may include a material having a higher heat retaining property or a higher heat retaining property (a material having a lower thermal conductivity) 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. 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 a material include foamed polyurethane, polystyrene, PE, PP, 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 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 crosslinked styrene-acrylic resins, (meth) acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluororesins, 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, when the plastic member 40a consists of a single layer, it is preferable that it is 0.01-50 mass parts with respect to 100 mass parts of resin materials contained in the plastic member 40a. More preferably, it is -20 mass parts. Moreover, when the plastic member 40a consists of a multilayer, it is preferable that it is 0.01-50 mass parts with respect to 100 mass parts of resin materials contained in the layer of the plastic member 40a in which a hollow particle is contained. More preferably, it is -20 mass parts.

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

Further, the plastic member 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. Printing can be performed by a printing method such as an inkjet method, a gravure printing method, an offset printing method, or a flexographic printing method. For example, when the inkjet method is used, a 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 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 40a may not have a contracting action on the preform 10a, or may have a contracting action.
The plastic member 40a having an action of contracting with respect to the preform 10a may be, for example, one that itself has contractibility or elasticity and can contract without applying an external action, or When the external action (for example, heat) is applied, the preform 10a may contract (for example, heat shrink).

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

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

  In one embodiment, the plastic member 40a can be manufactured by molding a resin sheet containing a resin material. Examples of the molding method include deep-drawing molding, or a method of molding a resin sheet into a tube shape and fusing or bonding the end portions thereof. Moreover, the plastic member 40a composed of multiple layers can be obtained by molding a laminated resin sheet obtained by laminating two or more resin sheets via the above-described adhesive.

  A commercial item may be used for the said resin sheet, and it can manufacture it by a conventionally well-known method. In this invention, it is preferable to manufacture by extrusion molding, and it is preferable that extrusion molding is performed by the T-die method or the inflation method.

  In one embodiment, the plastic member 40a can also be manufactured by extruding a heat-melted resin material into a tube shape. The multilayer plastic member 40a can be obtained by co-extrusion of two or more kinds of resin materials. Also, the plastic member 40a can be obtained by extruding the mixture in a mold and further blow-molding the mixture so as to expand the diameter along the inner surface of the mold.

  Further, the tube obtained by extruding the resin material is subjected to a diameter expansion process, whereby a plastic member 40a having contractility can be obtained. Specifically, one end of the tube is closed by adhesion, welding, or the like. The tube closed at one end is placed in a tube-shaped mold having an inner diameter larger than the outer diameter of the tube, and a blow device is placed at the other end of the tube. At this time, it is preferable that the blow device is in close contact with the tube so that air does not leak from between them. Next, the tube, the mold and the blow device are fed into the heating furnace in this arrangement and heated to 70 to 150 ° C. inside the heating furnace. As the heating furnace, a hot-air circulating heating furnace may be used in order to make the inside uniform. Or you may heat these by making a tube, a metal mold | die, and a blowing apparatus pass in the heated liquid. Next, the tube, the mold and the blow device are taken out of the heating furnace, and air is blown into the tube from the blow device, whereby the inner surface of the tube is pressurized and stretched. Thereby, a tube expand | swells and diameter-expands along the inner surface shape of a metal mold | die. Thereafter, the tube is cooled in cold water while air is blown from the blow device, and the tube is taken out of the mold. By cutting this into a desired size, a plastic member 40a having contractility is obtained.

  In one embodiment, the plastic member 40a can also be obtained by an injection molding method. Specifically, first, the resin material is heated and melted. Next, the heat-melted resin material is injected into the mold. The plastic member 40a can also be obtained by cooling it and taking it out of the mold.

Actinic ray irradiation step The method for producing a composite preform according to the present invention includes a step of irradiating an actinic ray to the plastic member 40a to crosslink the actinic ray crosslinkable resin contained in the plastic member 40a. By this actinic ray irradiation treatment, bacteria and the like generated between the preform 10a and the plastic member 40a can be sterilized, and the hygiene of the composite preform 70 and the composite container 10A can be improved.
In this specification, an actinic ray means a radiation that chemically acts on a resin material to promote a crosslinking reaction, specifically, visible light, ultraviolet ray, X-ray, electron beam, α ray, It means β ray, γ ray and the like. Among these, γ rays are preferable because of their high penetrating power.
Here, from the viewpoint of bactericidal properties, the dose of γ rays is preferably 1 to 500 kGy, more preferably 5 to 100 kGy.

(Other)
The method for producing a composite preform according to the present invention may include a step of providing an inner label member 60a between the preform 10a and the plastic member 40a as desired.

In one embodiment, the inner label member 60a can be provided by fitting into the preform 10a.
Moreover, in one Embodiment, it can also provide by attaching the plastic member 40a to the inner label member 60a, and putting it in the preform 10a.

  The inner label member 60a is attached to the outer surface of the preform 10a. 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 the 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 can be used. The inner label member 60a may be made of the same material as the preform 10a and / or the plastic member 40a, or may be made of a different material.

  Further, the inner label member 60a may include 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. As such a material, PE, PP, MXD-6, EVOH, PEN, or an oxygen absorbing material such as a fatty acid salt may be mixed with these materials.

  The inner label member 60a may include 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. 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.

  Further, the inner label member 60a may include a material (a material having low thermal conductivity) having a higher heat retaining property or a lower heat retaining property than a plastic material constituting the 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, PP, 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 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.

As shown in FIG. 12A, the inner label member 60a may have a bottomed cylindrical shape. In this case, the inner label member 60 a has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41.
Moreover, as shown in FIG.12 (b), the inner side label member 60a may consist of bottomless cylindrical shape.
Further, as shown in FIGS. 12 (c) and 12 (d), the inner label member 60a has a bottomless cylindrical shape formed by forming a film in a cylindrical shape and bonding the end portions thereof. May be. Moreover, it may consist of a bottomed cylinder shape produced by bonding the bottom part 42 together.
In FIG. 12, only the case where the inner label member 60a has the same shape as the plastic member 40a is illustrated, but the present invention is not limited to this.

  The inner label member 60a may be colored in colors such as red, blue, yellow, green, brown, black, and white, and may be transparent or opaque.

Manufacturing method of composite container 10A The manufacturing method of the composite container according to the present invention includes:
Heating the composite preform 70 produced as described above and inserting it into a blow mold;
A step of blow-molding the composite preform 70 after heating to expand the preform 10a and the plastic member 40a integrally.

  The manufacturing method of the composite container 10A of the present invention will be described in more detail with reference to FIGS.

First, the composite preform 70 is heated by the heating device 51 (see (a) in FIGS. 13 to 16).
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 (optionally the inner label member 60a) in this heating step can be set to 90 ° C. to 130 ° C., for example.
When the plastic member 40a has heat shrinkability, the production efficiency of the composite container 10A can be improved by manufacturing the composite preform 70 simultaneously with the heating step.

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see (b) in FIGS. 13 to 16).

  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 (b) in FIGS. 13 to 16). 13B, 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. 13 to FIG. 16C, 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 section are closed. A blow molding die 50 sealed by the die 50c is configured. Next, air is press-fitted into the preform 10 a and biaxial stretch blow molding is performed on the composite preform 70.

  Thereby, the container main 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. 13 to FIG. 16D, 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 mold 50.

Claims (5)

Preparing a preform made of plastic material;
Attaching a plastic member containing an actinic ray crosslinkable resin to the preform so as to surround the outside of the preform;
Irradiating the plastic member with an actinic ray to crosslink the actinic ray crosslinkable resin, and a method for producing a composite preform.   The method according to claim 1, wherein the actinic ray is γ-ray.   The method according to claim 2, wherein a dose of the γ-ray is 5 to 100 kGy.   The method according to any one of claims 1 to 3, wherein the plastic member comprises a crosslinking agent and / or a crosslinking aid. Heating the composite preform obtained by the method according to any one of claims 1 to 4 and inserting it into a blow mold; and
A method for producing a composite container, comprising: performing a blow molding on the composite preform after heating, and expanding the preform and the plastic member integrally.