JP2017047554A - Composite container, manufacturing method therefor, composite preform, and plastic member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite container capable of imparting various functions or characteristics to the container, and to provide a manufacturing method therefor, a composite preform, and a plastic member.SOLUTION: In a composite container including a container body made of a plastic material, and a green plastic member on the outer surface of the container body, the container body and the green plastic member are expanded integrally by blow molding, and the green plastic member is a heat-shrinkable tubing comprising a single layer, and contains a resin material crosslinked by an active ray and a coloring agent.SELECTED DRAWING: Figure 1

Description

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

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

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

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

JP 2009-241526 A

  The present invention has been made in consideration of such points, and provides a composite container, a method for manufacturing the composite container, a composite preform, and a plastic member capable of imparting various functions and characteristics to the container. The purpose is to do.

The composite container of the present invention is
A container body made of plastic material;
A green plastic member on the outer surface of the container body,
The container body and the green plastic member are inflated together by blow molding,
The green plastic member is a heat-shrinkable tube made of a single layer, and is characterized by comprising a resin material cross-linked with actinic rays and a colorant.

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

  In the aspect of the present invention, it is preferable that a label is attached to the container body and / or the green plastic member.

The composite preform of the present invention is
A preform made of plastic material,
A green plastic member provided so as to surround the outside of the preform,
The green plastic member is in close contact with the outside of the preform,
The green plastic member is a heat-shrinkable tube made of a single layer, and is characterized by comprising a resin material cross-linked with actinic rays and a colorant.

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

  In the aspect of the present invention, it is preferable that a label is attached to the container body and / or the green plastic member.

The plastic member of the present invention is
Green plastic for producing a composite container having a preform and a green plastic member closely attached to the outside of the preform by being mounted so as to surround the outside of the preform and being heated together with the preform. A member made of
It is a heat-shrinkable tube having a cylindrical body part that covers at least the body part of the preform, and is composed of a resin material and a colorant cross-linked by actinic rays.

The method for producing the composite container of the present invention comprises:
Preparing a preform made of plastic material;
Producing a composite preform having a preform and a green plastic member in close contact with the outside of the preform by providing a green plastic member so as to surround the outside of the preform;
Heating the composite preform and inserting it into a blow mold;
By performing blow molding on the composite preform in the blow mold, the composite preform preform and the green plastic member are inflated as a single unit, so that the container body and the container body are in close contact with each other. Producing a composite container having a green plastic member provided,
The green plastic member is a heat-shrinkable tube made of a single layer, and is characterized by comprising a resin material cross-linked with actinic rays and a colorant.

  According to an aspect of the present invention, the plastic member extrudes a mixture containing a crosslinkable resin material to obtain a tube-shaped molded product, and the molded product is irradiated with actinic rays to form a crosslinkable resin material. It is preferably obtained by a method comprising a step of cross-linking and a step of expanding the diameter of the molded product before or after irradiation with actinic rays.

  According to the present invention, the preform of the composite preform and the plastic member are expanded integrally by performing blow molding on the composite preform in the blow mold. For this reason, the preform (container body) and the plastic member can be formed of different members, and various functions and characteristics can be imparted to the composite container by appropriately selecting the type and shape of the plastic member. it can. Further, since the plastic member is a heat shrinkable tube, there is little air entering between the container body and the plastic member after blow molding, and the adhesiveness is high. Furthermore, since the plastic member contains a resin material cross-linked with actinic rays, the transparency of the plastic member and the scratch resistance and heat resistance of the composite container 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 included 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 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 front view showing the labeled composite container according to the first embodiment of the present invention. FIG. 4 is a vertical sectional view showing the composite preform according to the first embodiment of the present invention. FIG. 5 is a perspective view showing a green plastic member. FIG. 6 is a schematic view showing an embodiment of a method for expanding the diameter of a molded product. 7A to 7F are schematic views showing a blow molding method according to the first embodiment of the present invention. FIGS. 8A to 8G are schematic views showing a blow molding method according to a modification of the first embodiment of the present invention. FIG. 9 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 10 is a horizontal sectional view showing the composite container according to the second embodiment of the present invention (cross sectional view taken along the line XX of FIG. 9). FIG. 11 is a vertical sectional view showing a composite preform according to the second embodiment of the present invention. FIG. 12 is a perspective view showing an inner label member and a green plastic member. FIGS. 13A to 13F are schematic views showing a blow molding method according to a second embodiment of the present invention. 14A to 14G are schematic views showing a blow molding method according to a modification of the second embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 8 are views showing a first embodiment of the present invention.

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

  A composite container 10A shown in FIGS. 1 and 2 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 green plastic member 40 provided in close contact with the outside of the container body 10. If desired, a label 43 can be attached to the composite container 10A. In FIG. 1 and the like, the composite container 10 </ b> A with the label 43 attached is illustrated, but the present invention is not limited to this, and a configuration in which the label 43 is not attached may be employed.

  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 green 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.

  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 to about 50 micrometers-250 micrometers. Further, the weight of the container body 10 is not limited to this, but for example, when the internal volume of the container body 10 is 500 ml, the weight can be 10 g to 20 g. Thus, by reducing the thickness of the container main body 10, the weight of the container main body 10 can be reduced.

  Such a container main body 10 can be manufactured by biaxially stretching blow-molding a preform 10a (described later) manufactured by injection molding a synthetic resin material. As the material of the preform 10a, that is, the container body 10, a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PC (polycarbonate) may be used. preferable. Moreover, you may blend and use the various resin mentioned above. The container body 10 may be colored in colors such as red, blue, yellow, green, brown, black, and white, but is preferably colorless and transparent in consideration of ease of recycling. Further, a vapor deposition film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the container body 10 in order to enhance the barrier property of the container.

  The container body 10 can also be formed as a multilayer molded bottle having two or more layers. That is, by injection molding, for example, the intermediate layer is made of a resin (such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate)) having gas barrier properties and light shielding properties ( An intermediate layer) may be formed as a multilayer bottle having gas barrier properties and light-shielding properties by blow molding after forming a preform 10a comprising three or more layers. As the intermediate layer, a resin obtained by blending the above-described various resins may be used.

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

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

Next, the green plastic member 40 will be described. As will be described later, the green plastic member 40 (40a) is provided so as to surround the outside of the preform 10a. After being in close contact with the outside of the preform 10a, the green plastic member 40 (40a) is obtained by biaxial stretching blow molding together with the preform 10a. It is what was done.
The green plastic member 40a is a heat-shrinkable tube that includes a resin material cross-linked by actinic rays and has a function of contracting the preform 10a. Since the plastic member 40a is a heat-shrinkable tube, it is preferable because there is no deviation with respect to the preform 10a. Moreover, since followability is high with respect to blow molding, it is preferable. Furthermore, since the plastic member 40a includes a resin material cross-linked with actinic rays, the transparency of the plastic member and the scratch resistance of the composite container can be improved. Note that the plastic member 40a itself may be contractible or elastic and can be contracted without applying an external action.

  In this specification, “green” refers to a color tone that satisfies G> R and G> B when converted into an RGB color system (including sRGB, Adobe RGB, RGBA, and the like). The green plastic member 40 (40a) includes green, transparent, opaque, and translucent ones.

  The green plastic member 40a is a single-layer heat-shrinkable tube, 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 green 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 green plastic member 40 is provided so as to cover the shoulder portion 12 and the trunk portion 20 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 and the trunk portion 20 of the container body 10.

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

  The thickness of the green 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 green 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.

  Examples of the method for separating (peeling) the plastic member 40 from the container body 10 include hot water separation. Specifically, since the plastic member 40 (40a) has heat shrinkability, the composite container 10A including the plastic member 40 and the container main body 10 is replaced with a small piece container main body and a small piece plastic. By pulverizing into a plurality of flakes including a member and immersing the plurality of flakes in hot water, each flake can be separated into a small container body and a small plastic member. 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.

  As another example of the separation method, for example, the plastic member 40 is cut using a blade or the like, or a cutting line is provided in advance on the plastic member 40, and the plastic member 40 is peeled along the cutting line. be able to. 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.

  In one embodiment, the label 43 can be adhered to the green plastic member 40 via an adhesive, and the green plastic member 40 is separated (separated) from the container body 10 simultaneously with the removal of the label 43. Can do. The adhesive used in this case is not particularly limited as long as the green plastic member 40 is attached to the label 43 and can be separated from the container body 10. However, the adhesive is a cyanoacrylate adhesive or a silicone-based adhesive. Examples thereof include an adhesive and an epoxy-based adhesive.

  Examples of the label 43 include a shrink label, a stretch label, a roll label, a tack label, and a paper label. Among these, it is preferable to use a shrink label, a stretch label or a roll label because of high productivity.

  The label 43 is preferably provided with a printed region on which printing has been performed. The items displayed in the print area may be character information such as the name of the content liquid, the manufacturer, the name of the raw material, etc. in addition to the design and the product name. The label 43 may be partially or entirely colored in a color such as red, blue, yellow, green, brown, black, white, and may be transparent or opaque. Among these, it is preferable to use a shrink label, a stretch label or a roll label because of high productivity.

  As the composite container 10A to which the label 43 is attached, for example, as shown in FIGS. 1 and 3A, the label 43 is attached so as to cover a part of the composite container 10 and the green plastic member 40. Can be mentioned. Moreover, as shown in FIG.3 (b), what attached the label 43 so that the whole region of the green plastic member 40 may be mentioned can be mentioned. Further, as shown in FIG. 3 (c), a label 43 is provided so as to cover the entire area of the green plastic member 40, and a portion for displaying the characters on the label is transparent. The thing of the colored structure can be mentioned. Further, the present invention is not limited to this, and a different pattern is printed on the green plastic member 40 and the label 43, and the green plastic member 40 and the label 43 are overlapped with each other to form a single picture, A structure with a three-dimensional effect can also be used (not shown).

  Hereinafter, each aspect of the above-described label 43 will be described.

  A shrink label can be wound so that the container main body 10 and / or the green plastic member 40 whole area or one part may be covered. The shrink label can be obtained by attaching to the container body 10 and / or the green plastic member 40 and shrinking at a temperature of 80 to 90 degrees.

  Shrink labels are polylactic acid film, polystyrene film, polyester film, low density polyethylene film, medium density polyethylene film, high density polyethylene film, low density linear polyethylene film, cyclic polyolefin film, polypropylene film, ethylene-propylene Centrifugal polyolefin film, polyester-polystyrene multilayer film, non-woven fabric formed from resin such as copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer Laminate film of polyester and shrink film, polyester-polystyrene coextruded film, polyamide film such as 6-nylon film, 6,6-nylon film, chlorinated polyethylene , Modified polyolefin film formed as a film of a resin such as chlorinated polypropylene, vinyl chloride - can be produced using was film-formed from a resin of vinyl acetate copolymer film, a resin film such as an acrylic resin film.

  The above film is made of a single layer using one or more kinds of resins constituting the film and using a film forming method such as an extrusion method, a cast molding method, a T-die method, a cutting method, and an inflation method. Filmed, multilayered by coextrusion using two or more types of resin, or formed by mixing two or more types of resin, and uniaxially or biaxially by tenter method or tubular method Various resin films formed by stretching in the axial direction can be used, but a stretched film, preferably a uniaxially stretched film in the flow direction. These films may be foamed films.

  In the present invention, a stretched polyester film, a stretched polystyrene film, a stretched polyolefin film, a polylactic acid film, a foamed polyolefin film, a stretched polyester-polystyrene coextruded film or a foamed polystyrene film, because of its high heat insulation properties, A polyester-polystyrene multilayer film or the like can be suitably used, or a laminated film of a nonwoven fabric and the film may be used. The stretched film may be uniaxially stretched or biaxially stretched. In the case of a uniaxially stretched film, it may be longitudinally uniaxially stretched or laterally uniaxially stretched.

  Although the thickness of a shrink label is not limited to this, For example, it can be set as about 10 micrometers-about 80 micrometers in the state attached to 10 A of composite containers.

  Like a shrink label, a stretch label can be wound so that the container main body 10 and / or the green plastic member 40 whole region or one part may be covered. The stretch label can be obtained by being fitted to the composite container 10A while being stretched in the circumferential direction, and then contracted by removing the pulling force, following the composite container 10A, and being wound.

  Stretch labels are thermoplastic resin films with moderate flexibility, such as single-layer or multilayer resin films made of polyolefin resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, low-density linear polyethylene, and polypropylene. Can be used. Among these, it is preferable to produce using a single layer film made of low density linear polyethylene and a multilayer film provided with a layer made of low density linear polyethylene. These films can be produced by the method described above.

  Although the thickness of a stretch label is not limited to this, For example, it can be set as about 5 micrometers-50 micrometers in the state attached to 10 A of composite containers.

  The roll label and the tack label can be wound so as to cover the whole area or a part of the container body 10 and / or the green plastic member 40. The roll label can be obtained by winding a resin film around a composite container and bonding or fusing the end of the resin film. The tack label can be obtained by directly attaching the resin film to the green plastic member 40 via an adhesive or the like. As the adhesive, those described above can be used, and even a shrink label, a stretch label, and a tack label are attached to the green plastic member 40 via the adhesive, Adhesiveness may be improved. By improving the adhesion between the label 43 and the green plastic member 40, the green plastic member 40 can be separated (separated) from the container body 10 simultaneously with the removal of the label 43.

  The roll label and the tack label can be produced by using the above-described resin film. Examples of the adhesive include a polyvinyl acetate adhesive, a polyacrylate adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, a polyamide adhesive, Examples thereof include polyimide adhesives, amino resin adhesives, phenol resin adhesives, epoxy adhesives, polyurethane adhesives, rubber adhesives, and silicone adhesives.

  Although the thickness of a roll label and a tack label is not limited to this, For example, it can be set as about 5 micrometers-about 100 micrometers in the state attached to 10 A of composite containers.

  Similarly to the shrink label, the paper label can be wound so as to cover the container body 10 and / or the whole or part of the green plastic member 40. The paper label can be obtained by sticking the resin film directly to the composite container via an adhesive or the like, like the tack label.

  The paper label is preferably produced using paper having excellent water resistance impregnated with a polyisocyanate compound or the like.

  Although the thickness of a paper label is not limited to this, For example, it can be set as about 50 micrometers-300 micrometers in the state attached to 10 A of composite containers.

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

  As shown in FIG. 4, the composite preform 70 includes a preform 10a made of a plastic material and a bottomless cylindrical green plastic member 40a provided outside the preform 10a.

  Among these, the preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. 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 green 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 is in close contact with the preform 10a so that it does not fall by its own weight. Yes. The green 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 green 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.

  The green plastic member 40a may be provided in the entire region or a partial region other than the mouth portion 11a. For example, the green plastic member 40 a may be provided so as to cover the entire body portion 20 a including the neck portion 13. Alternatively, the green plastic member 40a may cover the entire region of the trunk portion 20a and the entire region or a partial region of the bottom portion 30a. Furthermore, the number of green plastic members 40a is not limited to one, and a plurality of green plastic members 40a may be provided. For example, you may provide the two green plastic members 40a in the outer two parts of the trunk | drum 20a, respectively.

The green plastic member 40a (40) is a shrinkable tube containing a resin material and a colorant that are crosslinked by irradiating with actinic rays.
Examples of resin materials that are crosslinked by irradiation with actinic rays (hereinafter, sometimes referred to as “crosslinkable resin materials”) include PE, PP, polystyrene, polyvinylidene fluoride, polymethyl acrylate, polyvinyl chloride, polybutadiene, natural rubber, vinyl alcohol, Examples thereof include a polyamide resin, and the green plastic member 40a (40) can include one or more kinds of the crosslinkable resin material. Among the crosslinkable resin materials, PE and PP are preferable.
The content of the crosslinked resin material in the plastic member 40a is preferably 95 to 100% by mass, and more preferably 98 to 100% by mass.

  The green plastic member 40a (40) is made of a resin material other than the cross-linked resin material, for example, polylactic acid, poly-4-methylpentene-1, polystyrene, AS resin, as long as the characteristics are not impaired. ABS tree, polyvinylidene chloride, 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, Poly (ethylene terephthalate), Poly (butylene terephthalate), Poly (ethylene naphthalate), U polymer, Liquid crystal polymer, Modified polyphenylene ether, Polyether ketone, Polyether ether Ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyether sulfone, silicone resin, polyurethane, phenol resins, urea resins, polyethylene oxide, polypropylene oxide, polyacetal, may contain an epoxy resin or the like. Further, the green plastic member 40a (40) may include a copolymer in which two or more monomer units constituting the resin material described above are polymerized. Further, the green plastic member 40a (40) may include two or more of the above-described resin materials.

  The green plastic member 40a (40) preferably contains a crosslinking agent. Examples of the crosslinking agent include hexamethylenediamine carbamate, diortolylguanidine, dicumyl peroxide and 1,3-phenylenebisoxazoline. Etc.

  The content of the crosslinking agent is preferably 0.1 to 5 parts by mass when the total amount of the crosslinked resin material contained in the plastic member 40a (40) is 100 parts by mass, More preferably, it is ˜2 parts by mass.

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

  The content of the crosslinking aid is preferably 0.1 to 5 parts by mass when the total amount of the crosslinked resin material contained in the plastic member 40a (40) is 100 parts by mass. It is more preferable that it is 1-2 mass parts.

  The colorant contained in the green plastic member 40a (40) may be a pigment or a dye, but is preferably a pigment from the viewpoint of light resistance. Moreover, a colorant will not be specifically limited if the plastic member 40 (40a) obtained becomes green, Colorants, such as green, white, black, blue, and yellow, can be used individually or in combination.

  The content of the colorant is preferably 0.01 to 10 parts by mass, and 0.05 to 3.0 parts by mass with respect to 100 parts by mass of the total amount of the resin material contained in the green plastic member 40a. Is more preferably 0.1 to 2.0 parts by mass. If content of a coloring agent is in the said numerical range, the change of resin performance can be suppressed as much as possible, and a color tone can be shape | molded stably.

  The green plastic member 40a (40) may contain various additives 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 dispersant, an ultraviolet absorber, a coloring pigment, and the like can be added. In addition, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the resin material, using a foam member having a foam cell diameter of 0.5 to 100 μm, and molding this foam preform, The light shielding property can be improved.

  The green plastic member 40a (40) may contain the same material as the container body 10 (preform 10a). In this case, in the composite container 10A, for example, the green plastic member 40 can be arranged mainly on the portion where the strength is desired to be increased, and the strength of the portion can be selectively increased. For example, green 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 a material include polyolefin resins such as PE and PP, polystyrene resins such as PS, and the like.

  The green plastic member 40a (40) 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, a green 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 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.

  Further, the green plastic member 40a (40) may contain 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 green plastic member 40 a 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 main 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 green plastic member 40a (40) 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 green plastic member 40 may be provided on the whole or a part of the body 20 in the container body 10 to enhance the heat retaining property or the cold retaining property of the body 20. Further, when the user grips the composite container 10A, it is prevented that the composite container 10A becomes difficult to hold due to being too hot or too cold. Examples of such materials include foamed polyurethane, polystyrene, PE, PP, phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. 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. 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. Also, Ropeke HP-1055, Ropeke HP-91, Ropeke OP-84J, Ropeke Ultra, Ropeke SE, Ropeke ST (manufactured by Rohm and Haas), Nipol MH-5055 (manufactured by Nippon Zeon), SX8782 , And 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 green plastic member 40a (40) may include 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.

  Furthermore, the green plastic member 40a (40) may be designed or printed. For example, the green plastic member 40 may be provided on all or part of the body 20 of the container body 10, and images and characters may be displayed on the body 20. The printing may be formed by designing or printing the plain green plastic member 40a by a printing method such as an inkjet method, a gravure printing method, an offset printing method, a flexographic printing method, or the like. For example, when the inkjet method is used, a printing layer can be formed by applying a UV curable ink to the green plastic member 40a, irradiating it with UV, and curing it. This printing may be performed on the green plastic member 40a before being attached to the preform 10a, or may be performed in a state where the green plastic member 40a is provided outside the preform 10a. Furthermore, the green plastic member 40 of the composite container 10A after blow molding may be printed. As a material of the green plastic member 40, the same material as the container body 10 may be used, or a material different from the container body 10 may be used. Further, a part of the green plastic member 40a may be colored red, blue, yellow, green, brown, black, white or the like, and may be transparent or opaque.

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

  As shown in FIGS. 4 and 5, the green plastic member 40a preferably has a bottomless cylindrical shape as a whole. By providing such a green plastic member 40, various functions and characteristics can be imparted to the body portion 20 of the composite container 10A.

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

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

  The green plastic member 40a includes (1) a step of extruding a mixture containing a crosslinkable resin material to obtain a tube-shaped molded product, and (2) irradiating the molded product with actinic rays to provide a resin material. It can be produced by a method comprising a crosslinking step and (3) a step of expanding the diameter of the molded product before or after irradiation with actinic rays. Moreover, the process of cutting to (4) desired magnitude | size may be included if desired.

(1) Extrusion molding process In extrusion molding, a mixture of the above-described crosslinkable resin material and other resin materials to be added as desired, a crosslinking agent, a crosslinking aid or an additive is heated and melted in an extrusion apparatus to melt The obtained mixture can be continuously extruded by using a ring die or the like. The melting temperature of the mixture is preferably heated to a temperature of the melting point (Tm) to Tm + 70 ° C. of the resin material contained in the mixture, and more preferably heated to a temperature of Tm to Tm + 40 ° C.

(2) Actinic ray irradiation process In this specification, an actinic ray means the radiation which can be made to act on a crosslinkable resin material chemically, accelerate | stimulate a crosslinking reaction, and can obtain the crosslinked resin material. Specifically, it means visible light, ultraviolet rays, X-rays, electron beams, α rays, β rays, γ rays and the like. Among these, an electron beam is preferable because of easy control. Here, the dose of the electron beam is preferably 1 to 1000 kGy, and more preferably 50 to 400 kGy. Further, the acceleration voltage of the electron beam is preferably 50 to 1000 kV, and more preferably 75 to 300 kV.

(Diameter expansion process)
The molded product obtained by extrusion molding before or after irradiation with actinic light is expanded in diameter. As the diameter expansion method, for example, one end of the single-layer extruded tube is closed by welding or bonding one end of the obtained tubular molded product (FIG. 6A), and the one end is closed. The product 1 is placed in the mold 2 (see FIG. 6B). The inner diameter of the mold 2 is larger than the outer diameter of the tubular molded product 1. Next, the blow device 3 is disposed (mounted) on the other end of the molded product 1 (see FIG. 6C). At this time, it is preferable that the blow device 3 is in close contact with the molded product 1 so that air does not leak. Subsequently, the molded product 1, the mold 2, and the blow device 3 are sent to the heating furnace 4 in this arrangement and heated to 70 to 150 ° C. inside the heating furnace 4 (see FIG. 6D). As the heating furnace 4, a hot-air circulating heating furnace may be used in order to make the inside uniform. Or you may heat these by passing the molded article 1, the metal mold | die 2, and the blow apparatus 3 in the heated liquid. Next, the molded product 1, the mold 2 and the blow device 3 are taken out from the heating furnace 4, and air is blown into the molded product 1 from the blow device 3, whereby the inner surface of the molded product 1 is stretched under pressure. As a result, the molded product 1 expands and expands along the inner shape of the mold 2 (see FIG. 6E). Thereafter, the molded product 1 is cooled in cold water while air is being blown out from the blower 3 and is taken out from the mold 2 (see FIG. 6 (f)), whereby a molded product having an enlarged diameter can be obtained. .

  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. 7A). 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 green plastic member 40a is loosely inserted on the outer side of the preform 10a (see FIG. 7B). In this case, the green plastic member 40 a has a bottomless cylindrical shape as a whole and has a cylindrical body portion 41. The green plastic member 40a covers the entire area of the body portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10.

  Next, the preform 10a and the green plastic member 40a are heated by the heating device 51 (see FIG. 7C). Thereby, the composite preform 70 having the preform 10a and the green plastic member 40a adhered to the outside of the preform 10a can be manufactured. At this time, the preform 10a and the green plastic member 40a are uniformly 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 green plastic member 40a in this heating process may be 90 ° C. to 130 ° C., for example.

  Thus, when the green plastic member 40a is heated, the green plastic member 40a is thermally contracted and is in close contact with the outside of the preform 10a (see FIG. 7C). When the green plastic member 40a itself has contractibility, the green plastic member 40a is placed outside the preform 10a when the green plastic member 40a is provided outside the preform 10a (see FIG. 7B). It may be in close contact with.

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

  The composite container 10 </ b> A is molded using this blow molding die 50. In this case, the blow mold 50 includes a pair of body molds 50a and 50b and a bottom mold 50c that are divided from each other (see FIG. 7D). In FIG. 7D, 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. 7 (e), 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 green plastic member 40a are expanded as a unit. Thus, the preform 10a and the green plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50.

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

  Next, as shown in FIG. 7 (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.

Modified Example of Manufacturing Method of Composite Container 10A Next, another modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. The modification shown in FIGS. 8A to 8G heats the preform 10a and the green plastic member 40a in two stages, and other configurations are shown in FIGS. 7A to 7F. It is almost the same as the form. 8A to 8G, the same parts as those in FIGS. 7A to 7F are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, a preform 10a made of a plastic material is prepared (see FIG. 8A).

  Next, the green plastic member 40a is relaxed and inserted on the outside of the preform 10a (see FIG. 8B). In this case, the green plastic member 40 a has a bottomless cylindrical shape as a whole and has a cylindrical body portion 41. The green plastic member 40 is mounted so as to cover the entire region of the body portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10.

  Next, the preform 10a and the green plastic member 40a are heated by the first heating device 55 (see FIG. 8C). At this time, the heating temperature of the preform 10a and the green plastic member 40a may be 50 ° C. to 100 ° C., for example.

  When the green plastic member 40a is heated, the green plastic member 40a is thermally contracted and is in close contact with the outside of the preform 10a. Thereby, the composite preform 70 having the preform 10a and the green plastic member 40a in close contact with the outside of the preform 10a is obtained (see FIG. 8C).

  In this way, the green preform member 40a is heat-adhered to the outside of the preform 10a in advance using the first heating device 55, and the composite preform 70 is manufactured, so that the composite preform 70 is manufactured. The steps (FIGS. 8A to 8C) and the series of steps (FIGS. 8D to 8G) for producing the composite container 10A by blow molding are performed at different places (factories, etc.). It becomes possible.

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 8D). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the green plastic member 40a in this heating process may be 90 ° C. to 130 ° C., for example.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 8E). In this case, the heating for heat-shrinking the green plastic member 40a and the heating for blow-molding the preform 10a can be performed in the same process.

  The composite preform 70 is molded using the blow mold 50 and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the above-described FIGS. A composite container 10A provided with the contraction tube 40 is obtained (see FIGS. 8E to 8G).

  As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding die 50, the preform 10a of the composite preform 70 and the green plastic member 40a. As a unit, a composite container 10A including the container body 10 and the green plastic member 40 is manufactured. Thereby, preform 10a (container main part 10) and green plastic member 40a (plastic member 40) can be constituted from another member. Therefore, by appropriately selecting the type and shape of the green plastic member 40, various functions and characteristics can be freely imparted to the composite container 10A.

  Further, according to the present embodiment, when the composite container 10A is manufactured, a general blow molding apparatus can be used as it is, so that it is necessary to prepare a new molding equipment for manufacturing the composite container 10A. Absent. Moreover, since the green plastic member 40a is provided outside the preform 10a, it is not necessary to prepare a new molding facility for molding the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 9 to 14 are views showing a second embodiment of the present invention. 9 to 14, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, an outline of a composite container produced by the blow molding method according to the present embodiment will be described with reference to FIGS. 9 and 10.

  A composite container 10A shown in FIGS. 9 and 10 includes a composite preform 70 including a preform 10a, an inner label member 60a, and a green plastic member 40a using a blow molding die 50, as will be described later (see FIG. 11). By performing biaxial stretch blow molding, the preform 10a of the composite preform 70, the inner label member 60a and the green plastic member 40a 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 green plastic member 40 is provided. Furthermore, a label 43 may be attached to the composite container 10A.

  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 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 green plastic member 40 is a single-layer shrinkable tube, and is in close contact with the outer surface of the container main body 10 and the outer surface of the inner label member 60 in a thinly extended state. It is so close that it does not move or rotate. A part of the green plastic member 40 may be translucent or transparent. In this case, the inner label member 60 can be visually recognized from the outside through the translucent or transparent 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 green plastic member 40a. It is a thing.

  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. 9, 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 in 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 green plastic member 40, or may be provided in a region narrower than the green plastic member 40. In the latter case, the inner label member 60 is preferably completely covered by the green 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 5 μm to 50 μm when attached to the container body 10.

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

  The green plastic member 40 is attached to the outer surface of the inner label member 60 without being bonded, and is in close contact with the container body 10 so as not to move or rotate. The green plastic member 40 is thinly stretched on the outer surface of the inner label member 60 to cover the inner label member 60. As shown in FIG. 10, the green plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

  In addition, since the configurations of the container body 10, the green plastic member 40, and the label 43 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 the present embodiment will be described with reference to FIG.

  As shown in FIG. 11, the composite preform 70 includes a preform 10a made of a plastic material, a bottomless cylindrical inner label member 60a provided in close contact with the outer side of the preform 10a, and an inner label member 60a. And a bottomless cylindrical plastic member 40a provided in close contact with the outside.

  The inner label member 60a is in close contact with the outer surface of the preform 10a, and is in close contact with the preform 10a without moving or rotating. 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, films such as polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate resin, polyacetal resin, and 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.

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

  For example, the inner label member 60a may be made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, the gas barrier property of the composite container 10A can be enhanced without using a multilayer preform or a preform containing a blend material as the preform 10a, and the content liquid can be prevented from being deteriorated by oxygen or water vapor. As such a material, PE, PP, MXD-6, EVOH, or an oxygen absorbing material such as a fatty acid salt may be mixed with these materials.

  The inner label member 60a may be made of a material having light barrier properties such as ultraviolet rays. In this case, without using a multilayer preform or a preform containing a blend material as the preform 10a, the light barrier property of the composite container 10A is improved, the invasion of oxygen into the container is prevented, and the content liquid is deteriorated. In addition, it is possible to prevent evaporation of water vapor from the inside of the container to the outside, and to prevent a decrease in the internal volume. 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 be made of a material having a higher heat retaining property or a higher heat retaining property than a plastic material constituting the container body 10 (preform 10a) (a material having a low thermal conductivity). 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 materials include foamed polyurethane, polystyrene, PE, PP, phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. Furthermore, it is preferable to comprise hollow particles. The average particle diameter of the hollow particles is preferably 1 to 200 μm, and more preferably 5 to 80 μm. The hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include the same ones as described above. Moreover, the said commercially available hollow particle can also be used. As content of a hollow particle, it is preferable that it is 0.01-50 mass parts with respect to 100 mass parts of resin contained in the inner side label member 60a, and it is more preferable that it is 1-20 mass parts.

  On the other hand, the green 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 as not to move or rotate. The green plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

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

  The inner label member 60a and the green 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 60 a and the green plastic member 40 a may be provided so as to cover the entire body portion 20 a including the neck portion 13. Furthermore, the inner label member 60a and the green plastic member 40a are not limited to one, and a plurality of inner label members 60a and green plastic members 40a may be provided. For example, the two inner label members 60a and the green 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 green plastic member 40a are substantially the same as those of the first embodiment described above, detailed description thereof is omitted here.

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

  As shown in FIGS. 11 and 12, the green plastic member 40a (inner label member 60a) preferably has a bottomless cylindrical shape as a whole and has a cylindrical body 41 (body 61). . In this case, various functions and characteristics can be imparted to the composite container 10A.

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

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

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

  In this case, a green plastic member 40a may be provided around the inner label member 60a in advance, and the inner label member 60a and the green 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 green plastic member 40a may be provided outside the inner label member 60a.

  Next, the preform 10a, the inner label member 60a, and the green plastic member 40a are heated by the heating device 51 (see FIG. 13C). At this time, the preform 10a, the inner label member 60a, and the plastic member 40a are uniformly 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, the inner label member 60a, and the green plastic member 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Thus, when the green plastic member 40a is heated, the green plastic member 40a is thermally contracted and is in close contact with the outside of the preform 10a (see FIG. 13C). When the green plastic member 40a itself has contractibility, the green plastic member 40a becomes the inner label member 60a when the green plastic member 40a is provided outside the inner label member 60a (see FIG. 13B). It may be in close contact with the outside.

  Subsequently, the preform 10a, the inner label member 60a, and the green plastic member 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 13D).

  The preform 10a, the inner label member 60a, and the green plastic member 40a are molded using this blow molding die 50, and are substantially the same as in the case of FIGS. 7A to 7F described above. And a composite container 10A including an inner label member 60a provided on the outer surface of the container body 10 and a green plastic member 40 provided on the outer side of the inner label member 60a is obtained (FIGS. 13D to 13D). f)).

  Next, with reference to FIGS. 14A to 14G, another modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described. The modification shown in FIGS. 14A to 14G heats the preform 10a and the green plastic member 40a in two stages, and other configurations are shown in FIGS. 13A to 13F. It is almost the same as the form. 14A to 14G, the same parts as those in FIGS. 13A to 13F are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, a preform 10a made of a plastic material is prepared (see FIG. 14A).

  Next, an inner label member 60a is provided outside the preform 10a, and a green plastic member 40a is provided outside the inner label member 60a (see FIG. 14B). The green plastic member 40a is mounted so as to cover the entire region of the trunk portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10. At least a part of the green plastic member 40a may be translucent or transparent.

  In this case, a green plastic member 40a may be provided around the inner label member 60a in advance, and the inner label member 60a and the green 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 green plastic member 40a may be provided outside the inner label member 60a.

  Next, the preform 10a, the inner label member 60a, and the green plastic member 40a are heated by the first heating device 55 (see FIG. 14C). At this time, the heating temperature of the preform 10a, the inner label member 60a, and the green plastic member 40a may be 50 ° C. to 100 ° C., for example.

  When the green plastic member 40a is heated, the green plastic member 40a is thermally contracted and is in close contact with the outside of the preform 10a. Thereby, the 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 green plastic member 40a in close contact with the outer side of the inner label member 60a is obtained (FIG. 14 (c)).

  Thus, the green preform member 40a is heat-adhered to the outside of the preform 10a and the inner label member 60a in advance using the first heating device 55, and the composite preform 70 is produced. A series of steps (FIGS. 14 (a) to (c)) for producing 70 and a series of steps (FIGS. 14 (d) to (g)) for producing composite container 10A by blow molding are performed at different locations (factories). Etc.).

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 14D). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a, the inner label member 60a, and the green plastic member 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 14E).

  The composite preform 70 is molded using the blow mold 50 and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the above-described FIGS. The composite container 10A including the inner label member 60 and the green plastic member 40 provided outside the inner label member 60 is obtained (see FIGS. 14E to 14G).

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

  Moreover, according to this Embodiment, preform 10a (container main body 10) and green plastic member 40a (green plastic member 40) can be comprised from another member. Therefore, by appropriately selecting the type and shape of the green plastic member 40, various functions and characteristics can be freely imparted to the composite container 10A.

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

Claims (9)

In composite containers,
A container body made of plastic material;
A green plastic member on the outer surface of the container body,
The container body and the green plastic member are expanded as a unit by blow molding,
The green plastic member is a heat-shrinkable tube made of a single layer, and includes a resin material and a colorant cross-linked by actinic rays, and a composite container.   The composite container according to claim 1, wherein the plastic member comprises a crosslinking agent and / or a crosslinking aid.   The composite container according to claim 1 or 2, wherein a label is attached to the container main body and / or the green plastic member. In composite preform,
A preform made of plastic material,
A green plastic member provided so as to surround the outside of the preform,
The green plastic member is in close contact with the outside of the preform;
The green plastic member is a heat-shrinkable tube made of a single layer, and includes a resin material crosslinked with actinic rays and a colorant, and a composite preform.   The composite container according to claim 4, wherein the plastic member comprises a crosslinking agent and / or a crosslinking aid.   The composite container according to claim 4 or 5, wherein a label is attached to the container body and / or the green plastic member. In order to produce a composite container having the preform and a green plastic member in close contact with the outside of the preform, which is mounted so as to surround the outside of the preform and is heated together with the preform. A green plastic member,
A plastic having a cylindrical body portion that covers at least the body portion of the preform, a single-layer heat-shrinkable tube, and comprising a resin material cross-linked by actinic rays and a colorant Made parts. In the manufacturing method of the composite container,
Preparing a preform made of plastic material;
Providing a green plastic member so as to surround the outer side of the preform to produce a composite preform having the preform and the green plastic member closely adhered to the outer side of the preform;
Heating the composite preform and inserting it into a blow mold; and
By subjecting the composite preform to blow molding in the blow molding die, the preform of the composite preform and the green plastic member are expanded as a unit, and thereby a container body and the container body Producing a composite container having a green plastic member provided in close contact with the outside of
The green plastic member is a heat-shrinkable tube made of a single layer, and includes a resin material and a colorant cross-linked by actinic rays, and a method for manufacturing a composite container.   A step in which the plastic member extrudes a mixture containing a crosslinkable resin material to obtain a tube-shaped molded product, and a step of irradiating the molded product with actinic rays to crosslink the crosslinkable resin material; The method according to claim 8, wherein the method comprises a step of expanding the diameter of the molded product before or after irradiation with actinic rays.

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