JP2018187826A - Composite preform and production method of the same, and composite container and production method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite preform in which the appearance of a surface of a plastic member shows no degradation even when subjected to near-infrared heating prior to blow molding, and a preform can be efficiently heated.SOLUTION: The composite preform of the present invention includes: a preform including a mouth part, a trunk part connected to the mouth part, and a bottom part connected to the trunk part; and a heat-shrinkable plastic member in a single layer structure disposed to surround the outside of the preform and comprising a resin material and a colorant. The preform has a multilayer structure including at least a gas barrier layer; and the heat-shrinkable plastic member has a transmittance for near-infrared rays of 50% or more.SELECTED DRAWING: Figure 1

Description

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

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

  A plastic bottle that contains such contents 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, it shape | molds in a container shape using the preform containing resin materials, such as a polyethylene terephthalate (PET) and a polypropylene (PP), for example. However, in the conventional biaxial stretch blow molding method, the preform is generally simply formed into a container shape. For this reason, when the container has various functions and characteristics (gas barrier properties such as oxygen barrier properties, carbon dioxide barrier properties, water vapor barrier properties, and heat retaining properties), for example, the material constituting the preform is changed. The means are limited. 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

The composite container disclosed in Japanese Patent Application Laid-Open No. 2015-128858 is manufactured by heating the composite preform with near infrared rays and then blow-molding, but depending on the type of colorant contained in the plastic member, etc. Only the outer plastic member was heated and melted, deteriorating its appearance.
Moreover, the preform could not be efficiently heated, and there was room for improvement in productivity.

  The present invention has been made on the basis of such knowledge, and a composite preform capable of efficiently heating a preform without deterioration of the appearance of the surface of a plastic member even by near infrared heating before blow molding. It is an object of the present invention to provide a composite container which is a blow molded product of the composite preform and a method for manufacturing the composite container.

  The composite preform of the present invention is provided so as to surround the outside of the preform, a preform having a mouth, a body connected to the mouth, a bottom connected to the body, and a resin material and coloring A heat-shrinkable plastic member having a single layer structure containing an agent, and the preform has a multilayer structure having at least a gas barrier layer, and the near-infrared transmittance of the heat-shrinkable plastic member is 50% or more. It is characterized by being.

  In the above aspect, the preform may have a multilayer structure comprising a polyester resin layer / gas barrier layer / polyester resin layer or a polyester resin layer / gas barrier layer / polyester resin layer / gas barrier layer / polyester resin layer. preferable.

  In the said aspect, it is preferable that the gas barrier layer with which a composite preform is provided contains an oxidation promoter and / or an oxygen absorber.

  In the said aspect, it is preferable that a colorant is a brown pigment and content in a preform is 0.1 to 30 mass%.

  In the said aspect, it is preferable that the end of the heat-shrinkable plastic member of the bottom part side of a preform is crimped | bonded.

  In the said aspect, it is preferable that the crimped | bonded part of the heat shrinkable plastic member is twisted and forms the twist part.

  In the above aspect, it is preferable that the heat-shrinkable plastic member has one end thereof and at least one cut at one end close to the mouth of the preform.

  The composite container of the present invention is a blow molded product of the composite preform, and includes a mouth, a neck provided below the mouth, a shoulder provided below the neck, and a trunk provided below the shoulder. A container body provided with a portion and a bottom part provided below the body part, and a single-layer heat-shrinkable plastic member provided in close contact with the outside of the container body. It has a multilayer structure including at least a gas barrier layer, and is characterized in that one end of a heat-shrinkable plastic member on the bottom side of the container body is crimped to form a bottom portion.

  In the said aspect, it is preferable that it is a composite container for filling beer as a content whose transmittance | permeability of visible light with a wavelength of 400-500 nm is 20% or less.

  In the said aspect, it is preferable that the bottom part shape of a container main body is a petaloid shape.

  In the said aspect, it is preferable that the label is attached to the container main body and / or the heat shrinkable plastic member.

  In the said aspect, it is preferable that a label is a shrink label, a stretch label, a roll label, a tack label, or a paper label.

  In the said aspect, it is preferable that printing is given to the label.

  The method for producing a composite preform of the present invention includes a step of preparing a preform and a heat-shrinkable plastic member, a step of fitting the preform from one end of the heat-shrinkable plastic member, a preform and a heat-shrinkable plastic Heating the member made and heat shrinking the member made of heat-shrinkable plastic.

  In the said aspect, it is preferable that the heat-shrinkable plastic member further includes a step of having a blank portion at the end opposite to the one end where the fitting is performed, and thermocompression bonding the blank portion.

  In the said aspect, it is preferable to further include the process of twisting the blank part which carried out thermocompression bonding and forming a twist part.

  In the said aspect, it is preferable to further include the process of preheating a preform before a fitting process.

  In the said aspect, it is preferable to further include the process of providing a notch in the heat-shrinkable plastic member.

  In the said aspect, it is preferable to further include the process of sterilizing a preform and / or a heat-shrinkable plastic member before and / or after the fitting process.

  The method for producing a composite container of the present invention includes a step of heating the composite preform and inserting the composite preform into a blow mold, and performing blow molding on the heated composite preform, thereby performing the preform and heat shrinkage. And a step of expanding the plastic member as a unit.

  The product of the present invention is characterized in that the above-mentioned composite container is filled with contents, and a cap is screwed into the mouth of the container body.

  In the said aspect, it is preferable that an opening | mouth part has a flange part and a cap consists of an overcap which covers a flange part.

  In the said aspect, it is preferable to further provide the light shielding film which coat | covers a cap.

  According to the present invention, a composite preform capable of efficiently heating a preform without deterioration of the appearance of the plastic member surface even by near infrared heating before blow molding, and a method for producing the same, and the composite It is possible to provide a composite container that is a blow-molded product of a preform and a method for manufacturing the same.

FIG. 1 is a partial vertical cross-sectional view of a composite preform of the present invention in one embodiment. FIG. 2 is a partial vertical sectional view showing a composite container manufactured using the composite preform of the present invention in one embodiment. FIG. 3 is a horizontal cross-sectional view of the composite container shown in FIG. 2 taken along line III-III. FIG. 4 is a schematic view showing an embodiment of a method for producing a heat-shrinkable plastic member. FIG. 5 is a vertical sectional view showing a state in which the preform is fitted into a heat-shrinkable plastic member. FIG. 6 is a front view of a heat-shrinkable plastic member. FIG. 7 is a front view of the preform. FIG. 8 is a perspective view showing a crimping instrument according to an embodiment. FIG. 9 is a front view of a composite preform having a twisted portion. FIG. 10 is a schematic view showing a method for manufacturing a composite container. FIG. 11 is a schematic diagram illustrating a composite container manufacturing apparatus according to an embodiment. FIG. 12 is a partial vertical sectional view showing a product using a composite container in one embodiment. FIG. 13 is an enlarged partial vertical sectional view showing the periphery of the mouth portion of a product using a composite container in one embodiment.

Composite preform 70
In one embodiment, as shown in FIG. 1, the composite preform 70 includes a multilayer structure preform 10 a including at least a gas barrier layer and a single layer structure heat shrinkage provided so as to surround the outside of the preform 10 a. And a plastic member 40a.

  2 is obtained by subjecting this composite preform 70 to biaxial stretch blow molding and inflating the preform 10a of the composite preform 70 and the heat-shrinkable plastic member 40a together. Can do.

Preform 10a
As shown in FIG. 1, 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 preform 10a has a multilayer structure including at least a gas barrier layer. The preform 10a may include two or more gas barrier layers. In this case, the configuration and thickness of each layer may be the same or different.

  The gas barrier layer comprises a gas barrier resin, and metaxylene adipamide (MXD-6), nylon 6, nylon 6,6, nylon 6-nylon 6,6 copolymer, ethylene-vinyl acetate copolymer ( EVA), ethylene-vinyl alcohol copolymer (EVOH), polyglycolic acid (PGA), polyvinylidene chloride copolymer (PVDC), polyacrylonitrile, polyvinyl alcohol (PVA), polytetrafluoroethylene (PTFE) and styrene- Examples include isobutylene-styrene copolymer. The gas barrier layer may contain two or more kinds of the above gas barrier resins.

  The content of the gas barrier resin in the gas barrier layer is preferably 50% by mass or more, more preferably 80% by mass or more, and further preferably 90% by mass or more. By setting the content of the gas barrier resin in the above numerical range, the gas barrier property of the composite container 10A can be further improved.

  The gas barrier layer may contain a resin material other than the gas barrier resin as long as the characteristics are not impaired. Other resins include polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), polyethylene (LDPE, MDPE, HDPE, LLDPE), polypropylene (PP), and ethylene-propylene. Copolymers, polyolefin resins such as poly-4-methylpentene and poly-1-butene, vinyl chloride homopolymers, vinylidene chloride homopolymers, vinyl chloride-vinyl acetate copolymers, vinyl chloride or vinylidene chloride And vinyl resins such as copolymers with maleic acid derivatives and higher alkyl vinyl ethers, ionomer resins and the like.

  In one embodiment, the gas barrier layer comprises an oxidation promoter. The oxidation accelerator is not particularly limited as long as it promotes the reaction between the oxygen absorbent that can be auto-oxidized by molecular oxygen and molecular oxygen. For example, a radical generator, a photo-oxidation catalyst, a transition A metal salt etc. are mentioned. Among these, a transition metal salt is preferable because a sufficient effect can be exhibited even in a small amount. When the gas barrier layer contains an oxidation accelerator, the oxidation of the oxygen absorbent that can be auto-oxidized by molecular oxygen is promoted, and the oxygen absorption capacity is improved.

  Examples of metal salts include inorganic salts, organic salts, and complex salts. Examples of inorganic salts include halogenated salts, oxy salts, oxy acid salts, and silicates. Examples of the organic acid salt include carboxylate, sulfonate, phosphonate and the like. Examples of the complex salt include complexes with β-diketone or β-keto acid ester.

  The content of the oxidation accelerator in the gas barrier layer is preferably 0.001% by mass or more and 3% by mass or less, more preferably 0.005% by mass or more and 2% by mass or less, and 0.01% by mass. % Or more and 1.5% by mass or less is more preferable.

  The gas barrier layer may contain an oxygen absorbent. Examples of the oxygen absorbent include iron-based oxygen absorbents and non-ferrous oxygen absorbents, and the non-ferrous oxygen absorbent is more preferable because the transparency of the preform 10a can be maintained.

  Examples of the iron-based oxygen absorbent include iron powders such as reduced iron powder, interfacial iron powder, sprayed iron powder, iron grinding powder, electrolytic iron powder, and pulverized iron.

  Examples of non-ferrous oxygen absorbers include ethylenically unsaturated group-containing copolymers. Examples of the ethylenically unsaturated group-containing copolymer include polydienes such as polybutadiene, polychloroprene, poly (2-ethylbutadiene), and poly (2-butylbutadiene), which are mainly polymerized at positions 1 and 4, Ring-opening metathesis polymer of cycloolefin such as polyoctenylene, polypentenylene, polynorbornene, styrene-diene block copolymer such as styrene-isoprene block copolymer, styrene-butadiene copolymer, styrene-isoprene-styrene block copolymer Among them, polybutadiene, polyoctenylene, and styrene-isoprene-styrene block copolymer are preferable.

  The content of the oxygen absorbent in the gas barrier layer is preferably 0.1% by mass or more and 15% by mass or less, more preferably 0.5% by mass or more and 10% by mass or less, and 1% by mass or more. More preferably, it is 7.5 mass% or less.

  The gas barrier layer may contain an additive as long as the characteristics of the present invention 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, dispersants, ultraviolet absorbers, and color pigments.

The preform 10a can include layers other than the gas barrier layer (other layers). The other layers appropriately include the above-described resin materials, additives, and the like according to applications. For example, the other layer may be a polyester resin layer containing a polyester resin such as PET.
Specific examples of the layer structure include a polyester resin layer / gas barrier layer / polyester resin layer and a polyester resin layer / gas barrier layer / polyester resin layer / gas barrier layer / polyester resin layer from the innermost layer. Can be mentioned.
More specific layer configurations include PET / MXD-6 / PET, PET / MXD-6 + oxidation promoter / PET, PEN / MXD-6 / PEN, PEN / MXD-6 + oxidation promoter / PEN. Is mentioned.

  Each layer included in the preform 10a may contain colorants such as red, blue, yellow, green, brown, black, and white. However, in consideration of recyclability, these layers do not contain these colorants and are colorless. It is preferably transparent.

The preform 10a can be manufactured by co-injecting a resin material or the like using a conventionally known injection molding apparatus.
In one embodiment, an inert gas (nitrogen gas, argon gas) is mixed with a melt of resin material to form a foam preform having a foam cell diameter of 0.5 to 100 μm, and this foam preform is blown. The container body 10 may be produced by molding. 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.

Heat-shrinkable plastic member 40a
As shown in FIG. 1, the heat-shrinkable plastic member 40a is provided so as to surround the outside without being bonded to the preform 10a, and is in close contact with the preform 10a so as not to move or rotate. Or it is in close contact so that it does not fall under its own weight.
Since the plastic member 40a has heat shrinkability, it is prevented from being displaced with respect to the preform 10a during blow molding, or air bubbles are generated between the container body 10 and the heat shrinkable plastic member 40. The composite container 10A having a good appearance can be obtained.

The heat-shrinkable plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a.
In addition, as shown by the hatched portion in FIG. 1, one end of the heat-shrinkable plastic member 40a on the bottom 30a side of the preform 10a is thermocompression bonded, thereby forming a bottom portion that covers the bottom 30a of the preform 10a. It is preferable.
Usually, it is difficult to cover the bottom 30a of the preform 10a with the heat-shrinkable plastic member 40a. However, by adopting such a configuration, it becomes possible to cover the bottom of the container body 10 with a heat-shrinkable plastic member 40 after blow molding, and to provide various functions to the bottom such as gas barrier properties. it can.
This thermocompression bonding is particularly preferably performed along the shape of the bottom 30a of the preform 10a. Thereby, the bubble generation between the container main body 10 after blow molding and the heat-shrinkable plastic member 40 can be prevented, and the adhesion of the heat-shrinkable plastic member 40 to the container main body 10 can be improved. it can. Moreover, since there are no bubbles, the appearance of the composite container 10A can be improved.

In one embodiment, the heat-shrinkable plastic member 40a may include a twisted portion 80 in which a thermocompression bonded portion is twisted (see FIG. 9).
Since the heat-shrinkable plastic member 40a includes the twisted portion 80, not only can the bottom be formed, but also air bubbles can be formed between the container body 10 and the heat-shrinkable plastic member 40 included in the composite container 10A after blow molding. It is possible to prevent the occurrence of occurrence, and it is possible to prevent the thermocompression-bonded portion from being peeled off or damaged due to the force applied during blow molding.

In one embodiment, the heat-shrinkable plastic member 40a is one end of the body portion 41a, and when attached to the preform 10a, at least one cut is made at one end of the preform 10a on the side close to the mouth portion 11a. Have.
Since the heat-shrinkable plastic member 40a has such a cut, the plastic member 40 can be easily separated and removed from the composite container 10A after blow molding.

  The shape of the cut is not particularly limited, and may be a cut line, or may be a notch shape such as an arbitrary triangle or square.

When the cut is a cut line, the length is not particularly limited, and may be appropriately changed in accordance with the shape of the container body 10, for example, 0.5 mm or more in the plastic member 40a before blow molding, It can be 5 mm or less.
The heat-shrinkable plastic member 40a having a cut line having such a length is blow-molded together with the preform 10a, so that the heat-shrinkable plastic member 40 after blow molding has a cut of 3 mm or more and 15 mm or less. It will have a line and can be easily separated from the container body 10 based on this score line.
Further, the shape of the cutout is not particularly limited, and may be appropriately changed in consideration of the size, shape, etc. of the container body 10. For example, the shape of the cutout may be a triangular shape, a quadrangular shape, a semicircular shape, or a fan. Various shapes such as a shape combining curves such as shapes can be used.
When the shape of the cutout is a triangle, for example, the vertical length can be 0.5 mm or more and 5 mm or less, and the horizontal length can be 0.1 mm or more and 8 mm or less. Absent.
By blow-molding the heat-shrinkable plastic member 40a having such a notch together with the preform 10a, the heat-shrinkable plastic member 40 after blow molding has a vertical length of 1 mm or more, It has a triangular notch of 15 mm or less and a lateral length of 0.5 mm or more and 10 mm or less, and can be easily separated from the container body 10 based on the notch.

  In one embodiment, the heat-shrinkable plastic member 40a has a knob portion connected to the cut. The material constituting the knob portion is not particularly limited, and may be made of a resin material used for manufacturing the heat-shrinkable plastic member 40a, and may be made of paper or metal. Also good.

The near-infrared transmittance of the heat-shrinkable plastic member 40a is 50% or more, more preferably 60% or more and 100% or less, and further preferably 70% or more and 100% or less.
By setting the near-infrared transmittance of the heat-shrinkable plastic member 40a within the above numerical range, only the heat-shrinkable plastic member 40a surrounding the preform 10a is heated and melted in the near-infrared heating of the blow molding process. Therefore, it is possible to prevent the appearance from deteriorating. Moreover, since the preform 10a can be efficiently heated, production efficiency can be increased.
The near-infrared transmittance of the heat-shrinkable plastic member 40a can be adjusted by changing the type and content of a resin material and a colorant described later.
In the present invention, near infrared rays refer to light rays having a wavelength of 800 nm to 2500 nm.
Further, the near-infrared transmittance being 50% or more means that the absorbance of the heat-shrinkable plastic member 40a is measured using a known spectrophotometer (for example, a spectroscope manufactured by Hamamatsu Photonics Co., Ltd.). In this case, the transmittance is 50% or more at 800 nm to 1500 nm.

The heat-shrinkable plastic member 40a includes a resin material. The resin material contained in the heat-shrinkable plastic member 40a may be one type or two or more types.
In one embodiment, a polyolefin resin can be used as the resin material.
Examples of polyolefin resins include polyethylene (LDPE, MDPE, HDPE, LLDPE), polypropylene, polybutene, polybutadiene, polyisoprene, and copolymers of these monomers (alkenes) with other monomers. For example, a copolymer of ethylene and an α-olefin having 4 or more carbon atoms, an ethylene- (meth) acrylic acid copolymer, an ethylene- (meth) acrylic acid methyl copolymer, an ethylene- (meth) acrylic acid ethyl ester Examples thereof include a copolymer, an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer, and an ionomer resin.
The heat-shrinkable plastic member 40a may contain one or more of the above-described polyolefin resins.

  In one embodiment, as a resin material, PET, PEN, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl Butyral, diallyl phthalate resin, fluororesin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylene propylene rubber, butyl rubber, nitrile Rubber, acrylic rubber, silicone rubber, fluoro rubber, nylon 6, nylon 6,6, MXD-6, aromatic polyamide, polycarbonate, ethylene polyterephthalate, polybutylene terephthalate, poly Ethylene phthalate, 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 resin, urea Resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin, ionomer resin, and the like can be used.

  The content of the resin material in the heat-shrinkable plastic member 40a is preferably 70% by mass or more and 95% by mass or less, and more preferably 80% by mass or more and 90% by mass or less.

The heat-shrinkable plastic member 40a contains a colorant. When the heat-shrinkable plastic member 40a contains a colorant, the infrared transmittance of the heat-shrinkable plastic member 40a can be adjusted, and the visible light transmittance of the composite container 10A after blow molding can be adjusted. Can do.
As the colorant, a pigment or a dye may be used, but it is preferable to use a pigment from the viewpoint of light resistance.
The color of the colorant is not particularly limited, and a colorant such as brown, black, green, white, blue, or red can be used.
When beer is filled in the composite container 10A as the contents, the plastic member 40 after blow molding is required to cut visible light having a wavelength of 400 to 500 nm.
In one embodiment, by adding a brown colorant to the heat-shrinkable plastic member 40a, visible light having a wavelength of 400 to 500 nm can be cut, and the bitter components in the beer are decomposed by sunlight. A problem that 3-methyl-2-butene-1-thiol, which is an odor component, is generated can be prevented.
In the present invention, “beer” is defined in the Japanese liquor tax law, that is, “fermented using malt, hops and water as raw materials. Malt, hops, water and rice and other articles specified by a government ordinance. In addition to “fermented sake” under the liquor tax law. That is, the weight of malt in the raw material is (1) the weight of the raw material other than water is (1) 67/100 or more, (2) the 50/100 or more and less than 67/100, (3) 25/100 More than 50/100, and (4) less than 25/100, so-called “third beer”, “beer-taste beverage”, and “miscellaneous sake” are also included.

The heat-shrinkable plastic member 40a may contain one or more colorants, and the content thereof is preferably 0.1% by mass or more and 30% by mass or less, and 0.5% by mass. % Or more and 10% by mass or less is more preferable.
By setting the content of the colorant in the heat-shrinkable plastic member 40a within the above numerical range, the colorant can be favorably dispersed in the heat-shrinkable plastic member 40a. Moreover, since the moldability can be maintained, the heat-shrinkable plastic member 40a can be easily produced.

  As long as the effects of the present invention are not impaired, the heat-shrinkable plastic member 40a may contain other additives as described above.

In one embodiment, the heat-shrinkable plastic member 40a can be made by a method that includes an extrusion process.
More specifically, first, a mixture containing at least a resin material and a colorant is co-extruded from a ring die provided in an extrusion apparatus and cooled to form an unstretched extruded tube 1 (see FIG. 4A). .
Next, one end of the extruded tube is closed by welding or bonding one end of the unstretched extruded tube.
Further, the extruded tube 1 whose one end is closed is disposed in a mold 2 having an inner diameter larger than the outer diameter of the extruded tube 1 (see FIG. 4B).
Next, the blow device 3 is disposed (attached) to the other end of the extruded tube 1 (see FIG. 4C). At this time, it is preferable that the blower 3 is in close contact with the extruded tube 1 so that air does not leak between them.
Subsequently, the extruded tube 1, the mold 2 and the blow device 3 are sent to the heating furnace 4 in this arrangement, and heated to 70 to 150 ° C. inside the heating furnace 4 (see FIG. 4D). 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 extrusion tube 1, the metal mold | die 2, and the blow apparatus 3 in the heated liquid.
Next, the extruded tube 1, the mold 2 and the blow device 3 are taken out from the heating furnace 4, and air is blown into the extruded tube 1 from the blow device 3, whereby the inner surface of the extruded tube 1 is stretched under pressure. As a result, the extruded tube 1 expands and expands along the inner shape of the mold 2 (see FIG. 4E).
Thereafter, the extruded tube 1 is cooled in cold water while air is blown out from the blower 3, and the extruded tube is taken out from the mold 2 (see FIG. 4 (f)). By cutting this into a desired size, a heat-shrinkable plastic member 40a is obtained (see FIG. 4G).

Furthermore, the heat shrinkable plastic member 40a may be designed or printed on the surface thereof. 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.
The place where the design and printing are applied, not particularly limited, may be the outer surface or the inner surface.
Printing can be performed by a printing method such as an inkjet method, a gravure printing method, an offset printing method, a flexographic printing method, a thermal transfer method, a hot stamp (foil stamping), or the like. For example, when the inkjet method is used, a print layer can be formed by applying UV curable ink to the heat-shrinkable plastic member 40a (40), irradiating it with UV, and curing it.
This printing may be performed on the heat-shrinkable plastic member 40a before being fitted into the preform 10a, or may be performed in a state where the heat-shrinkable plastic member 40a is provided outside the preform 10a. good. Further, the heat-shrinkable plastic member 40 provided in the composite container 10A after blow molding may be printed.

Manufacturing method of composite preform 70 The manufacturing method of the composite preform 70 of the present invention includes:
Preparing the preform 10a and the heat-shrinkable plastic member 40a;
A step of fitting the preform 10a from one end of the heat-shrinkable plastic member 40a;
Heating the preform 10a and the heat-shrinkable plastic member 40a, and heat-shrinking the heat-shrinkable plastic member 40a.
In addition, the method for manufacturing the composite preform 70 of the present invention may further include a step of thermocompression bonding the blank portion of the heat-shrinkable plastic member 40a.
In addition, the method for manufacturing the composite preform 70 of the present invention may further include a step of twisting the blank portion subjected to thermocompression bonding to form the twisted portion 80.
Moreover, the manufacturing method of the composite preform 70 of this invention may include the process of providing the notch 90 in the heat-shrinkable plastic member 40a.
Furthermore, the method for manufacturing the composite preform 70 of the present invention may further include a step of sterilizing the preform 10a and / or the heat-shrinkable plastic member 40a.

Process for Preparing Preform 10a and Heat-Shrinkable Plastic Member 40a As described above, the preform 10a and the heat-shrinkable plastic member 40a may be prepared by a conventionally known method, and are commercially available. May be used.

As shown in FIG. 5, the length X of the heat-shrinkable plastic member 40a is preferably longer than the sum Y of the lengths of the body portion 20a and the bottom portion 30a of the preform 10a and has a blank portion. This facilitates thermocompression bonding of one end of the plastic member 40a (40) before and after blow molding.
The margin is preferably 3 mm or more, and more preferably 5 mm or more and 20 mm or less.
By setting the length of the blank portion within the above numerical range, the thermocompression bonding process can be performed more easily. In addition, it is possible to prevent the margin part from being excessively provided, to reduce the material to be used, and to reduce the cost.
In the present invention, the length of the heat-shrinkable plastic member 40a refers to the length X before heat shrinkage, as shown in FIG. Further, the sum of the lengths of the body portion 20a and the bottom portion 30a of the preform 10a refers to the length Y shown in FIG.

Inserting Step The method for manufacturing the composite preform 70 of the present invention includes a step of inserting the preform 10a from one end of the heat-shrinkable plastic member 40a.

In a preferred embodiment, prior to the fitting step, the preform is preferably preheated using near infrared rays, warm air, or the like.
This reduces the risk of excessively heating the heat-shrinkable plastic member 40a in order to increase the temperature of the preform 10a during blow molding, and the surface of the heat-shrinkable plastic member 40a is melted. It is possible to prevent the appearance from being damaged.
Although the heating temperature of the surface of the preform 10a is not particularly limited, it is preferably heated to 40 ° C. or higher and 90 ° C. or lower, and more preferably 50 ° C. or higher and 70 ° C. or lower. By setting the heating temperature within the above numerical range, the adhesion between the preform 10a and the heat-shrinkable plastic member 40a can be further improved.

Heat Shrinkage Process The method for manufacturing the composite preform 70 of the present invention includes a process of heating the preform 10a and the heat-shrinkable plastic member 40a to heat-shrink the heat-shrinkable plastic member 40a and closely adhere to the preform 10a. Including.

  The heating method of the preform 10a and the heat-shrinkable plastic member 40a is not particularly limited, and can be appropriately performed using near infrared rays, hot air, or the like. The heating temperature is preferably 60 ° C. or higher and 250 ° C. or lower, and more preferably 80 ° C. or higher and 150 ° C. or lower. The heating temperature is the surface temperature of the heat-shrinkable plastic member 40a at the time of heating, and is not an irradiation temperature such as near infrared rays or warm air.

Thermocompression-bonding process The manufacturing method of the composite preform 70 of the present invention includes a process of thermocompression bonding the end (blank part) opposite to one end of the heat-shrinkable plastic member 40a into which the preform 10a has been fitted. Also good.
An instrument used for thermocompression bonding (hereinafter, sometimes referred to as a “crimping instrument”) may be any one that can crimp the end by, for example, sandwiching it after heating the crimping part with infrared rays or warm air. There is no particular limitation, and for example, a metal or heat-resistant resin tool can be used, and these may be combined.
When thermocompression bonding of the heat-shrinkable plastic member 40a is performed along the shape of the bottom portion 30a of the preform 10a, the heat-shrinkable plastic member 40a can be sandwiched between a pair of crimping instruments 90A and B as shown in FIG. The material of this crimping | compression-bonding instrument is not specifically limited, The thing made from a metal or a heat resistant resin can be used.
Further, the surface of the crimping device may be flat or partially or entirely uneven.
Moreover, the crimping | compression-bonding instrument may have a heating mechanism in the surface. Thereby, the crimping strength can be further increased. The heating temperature of the surface of the crimping device is preferably, for example, 100 ° C. or more and 250 ° C. or less.

The pressure during pressure bonding is preferably 50 N / cm ² or more and 1000 N / cm ² or less, more preferably 100 N / cm ² or more and 500 N / cm ² or less.

  The temperature of the heat-shrinkable plastic member 40a during crimping is preferably 80 ° C. or more and 200 ° C. or less, although it depends on the material of the crimping instrument.

Further, one end of the heat-shrinkable plastic member 40a after thermocompression bonding may be cut to an appropriate length as desired. Thereby, the external appearance of the bottom part when it is set as the composite container 10A becomes favorable.
As shown in FIG. 1, the crimping portion may be cut in a straight line or in a shape along the shape of the bottom of the preform 10a (not shown).

Twist part formation process The method of this invention may include the process of twisting the thermocompression-bonded part and forming the twist part 80 shown in FIG.
By including such a step, the method of the present invention can not only form the bottom of the heat-shrinkable plastic member 40 after blow molding, but also the container body 10 and the heat-shrinkable plastic made of the composite container 10A. Air bubbles can be prevented from being generated between the member 40 and the force applied during blow molding can prevent the thermocompressed portion from being peeled off or being damaged. .

The method for forming the twisted portion 80 is not particularly limited, and the twisted portion 80 can be formed by twisting a manually crimped portion using an instrument such as pliers.
Moreover, it can carry out mechanically using the rotation apparatus etc. which hold | maintain the preform 10a and the heat-shrinkable plastic member 40a, and a rotation part.
Alternatively, a combination of these methods may be used. Specifically, the thermocompression-bonded portion is sandwiched with an instrument such as pliers, and the preform 10a and the heat-shrinkable plastic member 40a are rotated by the rotating portion. Thus, the twisted portion 80 can be formed.

In one embodiment, the twisted portion 80 can be formed simultaneously with the thermocompression bonding. Thereby, a work process can be reduced and productivity can be improved more.
Specifically, it can be performed by providing a rotation mechanism in the crimping tool, fixing the preform 10a and the heat-shrinkable plastic member 40a to the holding portion, and rotating the crimping tool. Moreover, it can also carry out by using the crimping instrument as a holding part and rotating the preform 10a and the heat-shrinkable plastic member 40a by the rotating part.

  The degree of twisting of the blank portion is not particularly limited, and may be a degree of rotation of 0.25 to 30 and may be performed until the thread is cut off, but the appearance can be improved. And since it can prevent more effectively that the part which carried out thermocompression bonding is damaged by blow molding, it is preferable to carry out until it cuts off.

The process of providing a notch | incision The method of this invention may include the process of providing an incision in the heat-shrinkable plastic member 40a.
By providing a notch in the heat-shrinkable plastic member 40a, the heat-shrinkable plastic member 40 can be easily separated and removed from the notch from the composite container 10A after blow molding.

  The position at which the cut is provided is not particularly limited, but is one end of the body portion 41a of the heat-shrinkable plastic member 40a and is close to the mouth portion 11a of the preform 10a when attached to the preform 10a. It is preferable to provide at one end of the side from the viewpoint of ease of separation. Further, the number of cuts is not limited, and may have cuts at two or more places.

The method of forming the cut is not particularly limited. For example, before the preform 10a is fitted, the cut of the heat-shrinkable plastic member 40a can be formed by using scissors or a knife. it can. Further, even after the preform 10a is fitted, a cut can be formed by using a laser beam or the like.
The laser light to be used is not particularly limited, and examples thereof include He-Ne laser, Ar laser, carbon dioxide laser, excimer laser, metal vapor laser, fiber laser, YAG lasers including Nd: YAG laser, and the like. And higher harmonic lasers.
Further, the cut may be formed on the composite container 10A obtained by blow-molding the composite preform 70, and can be formed on the heat-shrinkable plastic member 40 using laser light or the like.

The method of the present invention may include a step of providing a knob connected to the notch so that the heat-shrinkable plastic member 40 can be separated more easily.
The knob can be bonded to the heat-shrinkable plastic member 40a with a conventionally known adhesive. For example, polyvinyl acetate adhesive, polyacrylate adhesive, cyanoacrylate adhesive, ethylene copolymer adhesive, cellulose adhesive, polyester adhesive, polyamide adhesive, polyimide adhesive, Adhesives such as amino resin adhesives, phenol resin adhesives, epoxy adhesives, polyurethane adhesives, rubber adhesives, and silicone adhesives can be used.

Sterilization Treatment Step The method of the present invention may include a step of sterilizing the inner and outer surfaces of the preform 10a and / or the inner and outer surfaces of the heat-shrinkable plastic member 40a.
This sterilization treatment may be performed on the preform 10a and the heat-shrinkable plastic member 40a before fitting, or performed on the preform 10a and the heat-shrinkable plastic member 40a after fitting. It may be performed at both time points.
Further, the sterilization treatment may be performed on the container body 10 and the heat-shrinkable plastic member 40 included in the composite container 10A after blow molding.

  Examples of the sterilization treatment method include chemical sterilization treatment, photo sterilization treatment, radiation sterilization treatment, hot water sterilization treatment, hot filling sterilization treatment, and pasteurizing sterilization treatment, and these may be combined.

  Next, each sterilization process will be described below.

<Drug sterilization treatment>
(1) Hydrogen peroxide (H ₂ O ₂ ) sterilization treatment is one example of chemical sterilization treatment. In the hydrogen peroxide sterilization treatment, a mist, gas or a mixture thereof containing a hydrogen peroxide component is generated, and the hydrogen peroxide mist, gas or a mixture thereof is converted into the preform 10a, the heat-shrinkable plastic member 40a, the composite plate. The sterilization process is performed by spraying on the reform 70 or the composite container 10A. The preform 10a, the heat-shrinkable plastic member 40a, and the composite preform 70 may be sterilized by blowing hot air after being immersed in hydrogen peroxide water.
By contacting and adhering hydrogen peroxide, the microorganisms adhering to the surface of the preform 10a are sterilized or damaged. The preform may be preheated by blowing hot air on the preform immediately before spraying the mist, gas or a mixture thereof on the preform, or immediately after blowing hot air on the preform. Hydrogen peroxide adhering to the inner surface and / or outer surface of the composite preform 70 is activated by the heat of hot air, thereby sterilizing the microorganisms of the preform. Further, excess hydrogen peroxide adhering to the preform by blowing hot air is quickly removed from the surface of the preform 1.

(2) Examples of the chemical sterilization treatment include peracetic acid (CH ₃ COOH) sterilization treatment. This peracetic acid sterilization treatment is performed by spraying an aqueous peracetic acid solution in the form of liquid or gas onto the preform 10a, the heat-shrinkable plastic member 40a, the composite preform 70 or the composite container 10A. .

(3) As the chemical sterilization treatment, a chlorine sterilization treatment can be exemplified. In this chlorine sterilization treatment, for example, an acidic cleaning solution made of a chlorite aqueous solution or the like is used, and the preform 10a, the heat-shrinkable plastic member 40a, the composite preform 70 or the composite container 10A is cleaned with such an acidic cleaning solution. A sterilization treatment is performed.

(4) As the chemical sterilization treatment, an alkaline aqueous solution sterilization treatment using an alkaline aqueous solution can be used. The alkaline aqueous solution sterilization treatment is performed by washing the preform 10a, the heat-shrinkable plastic member 40a, the composite preform 70, or the composite container 10A with an alkaline aqueous solution made of, for example, a sodium hydroxide aqueous solution, a potassium hydroxide aqueous solution, or a sodium carbonate aqueous solution. A sterilization treatment is performed.

(5) As the chemical sterilization treatment, an ozone sterilization treatment using ozone (O ₃ ) can be used. The ozone sterilization treatment is performed by injecting ozone into the preform 10a, the heat-shrinkable plastic member 40a, the composite preform 70 or the composite container 10A.

<Photodisinfection treatment>
(1) Examples of the photo sterilization treatment include UV sterilization treatment and light pulse sterilization treatment. In this sterilization process, the preform 10a, the heat-shrinkable plastic member 40a, the composite preform 70 or the composite container 10A is irradiated with light to perform the sterilization process. As such light, for example, ultraviolet light having a wavelength of 150 to 2000 nm or light emitted from a xenon lamp can be used.

(2) A plasma sterilization process can be mentioned as the photo sterilization process. In the plasma sterilization treatment, low temperature plasma is generated in a decompression chamber, and the sterilization treatment is performed by irradiating the preform 10a, the heat-shrinkable plastic member 40a, the composite preform 70 or the composite container 10A.

<Radiation sterilization treatment>
As one of the radiation sterilization treatments, an EB sterilization treatment can be used. In the EB sterilization treatment, the preform 10a, the heat-shrinkable plastic member 40a, the composite preform 70 or the composite container 10A is irradiated with an electron beam (EB) to perform the sterilization treatment.

<Hot water sterilization treatment>
(1) The hot water sterilization treatment is performed by preparing hot water of 70 ° C. to 95 ° C., for example, and spraying the hot water onto the preform 10a, the heat-shrinkable plastic member 40a, the composite preform 70 or the composite container 10A. Is to be applied.

<Hot filling sterilization>
(1) The hot filling sterilization treatment is performed by, for example, preparing a medium temperature content liquid of 60 ° C. to 80 ° C. and filling the composite container 10A with the medium temperature content liquid to sterilize the composite container 10A. It is. This hot filling sterilization treatment can be performed simultaneously with the operation of filling the composite container 10A with the content liquid and the sterilization treatment.

(2) Further, for example, a high-temperature content liquid of 80 ° C. to 95 ° C. is prepared, and the composite container 10A can be subjected to hot filling sterilization treatment by filling and overturning the high-temperature content liquid in the composite container 10A.

(3) Moreover, after making water vapor adhere to the preform 10a, the heat-shrinkable plastic member 40a, and the composite preform 70, the preform can be heated to be sterilized.

<Pastorizing sterilization treatment>
(1) As another sterilization treatment, a pasting sterilization treatment in which the content liquid is filled in the composite container 10A and then the composite liquid 10A containing the content liquid is sterilized is exemplified.

Composite container 10A
The composite container 10A of the present invention is a blow-molded product of the above-described composite preform 70, and as shown in FIG. And a shrinkable plastic member 40.

The heat-shrinkable plastic member 40 preferably has a specific gravity of less than 1, more preferably less than 0.97.
By making the specific gravity of the heat-shrinkable plastic member 40 as described above, the heat-shrinkable plastic member 40 can be easily separated from the container body 10 in water.
At this time, the specific gravity of the container body 10 is preferably more than 1, more preferably more than 1.2.
The specific gravity of the container body 10 refers to the specific gravity of the entire container body 10 having a multilayer structure.

Since the heat-shrinkable plastic member 40 is not welded or bonded to the container body 10, it can be separated (separated) from the container body 10 and recovered.
As a method of separating (peeling) the heat-shrinkable plastic member 40 from the container body 10, for example, the heat-shrinkable plastic member 40 is cut using a blade or the like, or cut into the heat-shrinkable plastic member 40 in advance. A line and the above-mentioned notch are provided, and the heat-shrinkable plastic member 40 can be peeled along these.
In another embodiment, the composite container 10A is pulverized and then immersed in hot water, and the difference in specific gravity between the heat-shrinkable plastic member 40 and the container body 10 is used to separate and recover the heat-shrinkable plastic member 40. can do. Further, since the heat-shrinkable plastic member 40 has heat-shrinkability, it can be easily peeled off from the container body 10 in hot water.
Since the heat-shrinkable 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 oxygen permeability of the composite container 10A is preferably 1.0 cc / m ² · day · 0.21 atm or less, and more preferably 0.7 cc / m ² · day · 0.21 atm or less.
In the present invention, the oxygen permeability is in accordance with JIS K 7126 isobaric method, oxygen permeability measuring device (for example, manufactured by MOCON, trade name: OX-TRAN 2/20) 23 ° C., humidity 90% RH. It is a value measured according to the above condition, and is a value obtained by measuring the entire container of the composite container 10A whose mouth is closed with a jig and dividing by the surface area of the entire container excluding the mouth.

Container body 10
The container body 10 has a multilayer structure including at least a gas barrier layer, and 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, and a shoulder portion 12 below. The body part 20 provided and the bottom part 30 provided below the body part 20 are provided. 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.
Since the multilayer structure of the container body 10 such as the gas barrier layer has been described above, it is omitted here.

  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, or may be a mouthpiece type mouth portion.

  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). When filling the composite container 10A with beer or carbonated beverages such as carbonated water as the contents, the shape of the bottom 30 is preferably a petaloid shape.

The thickness of the gas barrier layer in the container body 10 is preferably 5 μm or more and 300 μm or less, and more preferably 10 μm or more and 100 μm or less. By setting the thickness of the gas barrier layer to the above numerical range, the gas barrier property of the composite container 10A can be improved.
The thickness of the container body 10 is preferably 100 μm or more and 1000 μm or less, and more preferably 200 μm or more and 500 μm or less.

Heat-shrinkable plastic member 40
As will be described later, the heat-shrinkable plastic member 40 is provided so as to surround the outer side of the preform 10a, and the heat-shrinkable plastic member 40a closely adhered to the outer side of the preform 10a is biaxially stretched together with the preform 10a. It was obtained by blow molding.
Further, the heat-shrinkable plastic member 40 has a single-layer structure, is in close contact with the outer surface of the container body 10 in a thinly extended state, and is not easily moved or rotated with respect to the container body 10. Installed. As shown in FIG. 3, the heat-shrinkable 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.
One end of the heat-shrinkable plastic member 40 on the bottom 30 side of the container body 10 is crimped to form a bottom portion that covers the bottom 30 of the container body 10. Therefore, it is possible to give a function such as a gas barrier property to the bottom of the composite container 10A, which is difficult when the conventional heat-shrinkable plastic member 40 is used.

Since one end of the heat-shrinkable plastic member 40 included in the composite container 10A of the present invention is pressure-bonded to form a bottom portion, the shoulder portion 12 and the trunk portion of the container body 10 excluding the mouth portion 11 and the neck portion 13 are included. 20 and the bottom 30 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.
Further, as described above, the crimped portion may be twisted.

  Further, the thickness of the heat-shrinkable plastic member 40 is not limited to this, but can be set to, for example, about 5 μm to 100 μm when attached to the container body 10. In addition, the thickness of the heat-shrinkable plastic member 40 may be uniform as a whole, or may have a thickness that is appropriately different depending on the location covering the container body 10.

As described above, when beer is filled as the contents, the heat-shrinkable plastic member 40 is required to cut visible light having a wavelength of 400 to 500 nm.
The transmittance of visible light having a wavelength of 400 to 500 nm of the composite container 10A including the heat-shrinkable plastic member 40 is preferably 15% or less, more preferably 5% or less, and further preferably 1% or less. preferable.
The visible light transmittance can be adjusted by changing the type and content of the resin material and the colorant.
Further, the transmittance of visible light can be measured at intervals of 0.5 nm using a spectrophotometer (manufactured by Shimadzu Corporation, UV-visible spectrophotometer), and the light transmittance of visible light wavelength can be obtained. .

The heat-shrinkable plastic member 40 may have a cut. This cut may be a cut line, or may be a notch such as an arbitrary triangle or square.
For example, when a cut line is provided in the heat-shrinkable plastic member 40a before blow molding, the cut line has a shape pulled from the left and right by stretching of the heat-shrinkable plastic member 40a by blow molding.
Moreover, the heat-shrinkable plastic member 40 may have a knob portion connected to the cut.
Details of the notch and the picking portion have been described above, and are omitted here.

In the composite container 10A of the present invention, a label may be attached to the container body 10 and / or the heat-shrinkable plastic member 40. This label may be provided so as to cover the entire container main body 10 or may be provided so as to cover a part thereof.
This label is, for example, a shrink label, a stretch label, a roll label, a tack label, a paper label, or a label suspended from the neck 13 of the composite container 10A with a string or the like (hereinafter referred to as “suspended label” in some cases). Etc. Among these, it is preferable to use a shrink label, a stretch label or a roll label because of high productivity.
Further, the light shielding property may be further improved by using a conventionally known shrink label having a light shielding property, a paper label, or the like.

  A shrink label can be wound so that the container main body 10 and / or the heat shrinkable plastic member 40 whole region or a part may be covered. The shrink label can be obtained by attaching to the container body 10 and / or the heat-shrinkable 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, nonwoven fabric formed from resin such as copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer And shrink film laminate film, polyester-polystyrene coextruded film, 6-nylon film, polyamide film such as 6,6-nylon film, chlorinated polyethylene, Modified polyolefin film formed as a film of a resin such as a fluorinated polypropylene, vinyl chloride - is film formation from vinyl acetate copolymer resin film can be produced by using a resin film such as an acrylic resin film.

  The above film is a single layer using one or more kinds of resins constituting it, and using a film forming method such as extrusion method, cast molding method, T-die method, cutting method, inflation method, etc. Film-formed, multi-layered by co-extrusion using two or more types of resin, or formed by mixing two or more types of resin, and uniaxial or tenter or tubular Various resin films that are stretched in a biaxial 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 heat shrinkable plastic member 40 whole region or a 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 having 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.

  Similarly to the shrink label, the roll label and the tack label can be wound so as to cover the entire region or a part of the container body 10 and / or the heat-shrinkable 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 composite container via an adhesive or the like.

  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 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 whole or a part of the container body 10 and / or the heat-shrinkable plastic member 40. Similar to the tack label, the paper label can be obtained by directly attaching a resin film to the composite container via an adhesive or the like.

  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.

  The suspended label can be obtained by hanging a label made of resin film or paper from the neck 13 of the composite container 10A with a string or the like. The size / thickness of the label is not particularly limited, and a label having an arbitrary size / thickness can be used.

  The label may be printed. Printing can be performed by a printing method such as an inkjet method, a gravure printing method, an offset printing method, a flexographic printing method, a thermal transfer method, a hot stamp (foil stamping), or the like. The displayed items may be character information such as the name of the content liquid, the manufacturer, the raw material name, etc. in addition to the design and the product name. The label may be partially or entirely colored in a color 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 10A according to the present invention includes:
Heating the composite preform 70 and inserting it into a blow mold;
A step of inflating the preform 10a and the heat-shrinkable plastic member 40a integrally by performing blow molding on the composite preform 70 after heating;
Comprising.
In addition, as described above, a step of sterilizing the composite container 10A may be included.

  The blow molding method of the composite preform 70 of the present invention will be described in more detail with reference to FIGS.

In one embodiment, the composite preform 70 is heated by the near infrared irradiation device 51 (see FIG. 10A). Note that the present invention is not limited to this, and heating with warm air or microwaves may be used.
At this time, the composite preform 70 is evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the near infrared irradiation device 51 is sent to the blow molding die 50 (see FIG. 10B).

The composite container 10 </ b> A is molded using this blow molding die 50.
In one embodiment, 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. 10B). In FIG. 10B, 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. 10C, after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the pair of body molds 50a and 50b and the bottom mold 50c are used. A sealed blow molding die 50 is configured. Next, a rod for stretching in the longitudinal direction enters from the mouth direction, contacts the bottom of the inner surface of the preform, and stretches as it is, and then air is pressed into the preform 10 a, and 2 to the composite preform 70. Axial stretch blow molding is performed.

  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 heat-shrinkable plastic member 40a are expanded as a unit. Thus, the preform 10a and the heat-shrinkable plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50.

  Next, as shown in FIG. 10D, 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.

It is not limited to the above-described method, and the composite container 10A may be manufactured by two-stage blow molding.
Specifically, first, the composite preform 70 is blow-molded so as to be larger than the composite container 10A having the capacity to be manufactured, and then the composite container 10A is heated to be freely contracted. The composite container 10A having a desired capacity can be obtained by blow molding the contracted composite container 10A. By manufacturing the composite container 10A by such blow molding, the strength and heat resistance of the composite container 10A can be improved.

One embodiment of an apparatus used for blow molding will be described below with reference to FIG.
A composite container manufacturing apparatus 100 shown in FIG. 11 is an apparatus for manufacturing the above-described composite container 10A. The composite container manufacturing apparatus 100 includes a molding unit 101, a plastic member mounting unit 102, a heating unit 103, and a blow molding unit 104.
The molding unit 101, the plastic member mounting unit 102, the heating unit 103, and the blow molding unit 104 are integrated with each other in the manufacturing apparatus 100.
By using this apparatus, the composite preform 70 and the composite container 10A can be manufactured in the same apparatus.

  The composite container manufacturing apparatus 100 further includes a control unit 105 that controls the molding unit 101, the plastic member mounting unit 102, the heating unit 103, and the blow molding unit 104. In the present specification, “integrated” means that a plurality of elements are physically connected and integrated, or are integrally controlled by one control unit (for example, the control unit 105). It means that

  The molding unit 101, the plastic member mounting unit 102, the heating unit 103, and the blow molding unit 104 are arranged in this order from the upstream side to the downstream side in the manufacturing apparatus 100. In FIG. 11, these units are arranged in a straight line, but the present invention is not limited to this, and they may be arranged in an annular shape.

  The molding unit 101 is for molding a preform 10a made of a plastic material. The molding unit 101 is, for example, an injection molding unit that performs injection molding. In this case, the molding unit 101 includes an injection unit 106 that melts and injects resin pellets, and a molding die 107 that molds the preform 10a. doing. The molding unit 101 may be a compression molding unit that produces the preform 10a by compression molding or an injection compression molding unit that produces the preform 10a by injection compression molding.

  The plastic member mounting unit 102 is provided with a plastic member 40 a outside the preform 10 a molded by the molding unit 101. The plastic member mounting unit 102 includes a holding portion 108 that holds the preform 10a, and a mounting portion 109 that holds the plastic member 40a and attaches the plastic member 40a to the preform 10a. . The plastic member mounting unit 102 mounts one plastic member 40a on one preform 10a. However, the plastic member mounting unit 102 is not limited to this, and a plurality of plastic members 40a are stacked on one preform 10a. It may be what you do.

  In addition, after the mounting part 109 loosely inserts the plastic member 40a into the preform 10a, the plastic member 40a may be thermally contracted by a heating mechanism (not shown).

  The heating unit 103 heats the preform 10a and the plastic member 40a to a temperature suitable for blow molding by heating the preform 10a and the plastic member 40a. For example, the heating unit 103 includes a heating device 51 that is an infrared heater. Have.

  The blow molding unit 104 expands the preform 10a and the plastic member 40a integrally by performing blow molding on the preform 10a and the plastic member 40a. 10a and a stretching rod 110 for stretching the plastic member 40a.

  As described above, the control unit 105 controls the molding unit 101, the plastic member mounting unit 102, the heating unit 103, and the blow molding unit 104. In this case, one control unit 105 controls all units, but is not limited to this. A plurality of control units 105 may be provided, each control unit 105 may control one or more units, and each control unit 105 or each unit may exchange signals with each other.

  Although not shown, the composite container manufacturing apparatus 100 includes a cooling unit for cooling the preform 10a (composite preform 70), a temperature adjustment unit for adjusting the temperature of the preform 10a (composite preform 70), and a blow unit. You may have the standby unit etc. which make the preform 10a (composite preform 70) before shaping | molding wait.

  Furthermore, a printing unit (not shown) that performs printing on the plastic member 40 after blow molding may be provided on the downstream side of the blow molding unit 104. In this case, the printing unit may be integrated with the molding unit 101, the plastic member mounting unit 102, the heating unit 103, and the blow molding unit 104.

Product Using Composite Container 10A The product of the present invention is a product in which the above-mentioned composite container 10A is filled with contents,
A cap 18 is screwed to the mouth 11 of the container body 10 (see FIG. 12).

  The cap 18 included in the product of the present invention may be an overcap that covers the flange portion of the mouth portion 11 of the container body. Since the cap 18 included in the product of the present invention is an overcap having light shielding properties, the light shielding properties can be further improved, and the storage stability of the contents can be further improved.

  In one embodiment, the mouth portion 11 includes a screw portion 14 to which the cap 18 is screwed, and a flange portion 17 provided below the screw portion 14. The neck portion 13 described above is provided below the flange portion 17, and the heat-shrinkable plastic member 40 reaches the lower surface of the flange portion 17 (see FIG. 13).

  In one embodiment, the cap 18 has a substantially cylindrical side wall portion 18a and a top surface portion 18b connected to the upper end of the side wall portion 18a and having a substantially circular plane. On the inner surface of the side wall portion 18a, a screw portion 18c that engages with the screw portion 14 of the mouth portion 11 and an annular inner peripheral projection 18d that is positioned below the screw portion 18c are formed. A weakening line 18e is formed at the upper end of the inner peripheral projection 18d, and the weakening line 18e can be broken when the cap 18 is loosened. A support ring 18f and an annular engagement protrusion 18g extending inward from the lower end of the support ring 18f are formed at the lower portion of the side wall 18a. The engaging protrusion 18 g is engaged with the lower surface of the flange portion 17. Thereby, when the cap 18 is loosened and the weakening line 18e is broken, the engaging projection 18g engages with the flange portion 17, so that the support ring 18f remains on the mouth portion 11 side. If the inner peripheral projection 18d is provided, the weakening line 18e can be broken even if the engaging projection 18g is not engaged with the flange portion 17, so that the engaging projection 18g is formed on the flange portion 17. It may be engaged or not engaged (see FIG. 13).

Moreover, in one Embodiment, the cap 18 and / or the flange part 17 are covered with the light shielding film. With such a configuration, the light shielding property of the composite container 10A can be further improved, and the storage stability of the contents can be further improved.
As the light shielding film, an opaque film having a light shielding property is used. Examples of the material for the light shielding film include polyethylene terephthalate (PET), polystyrene (PS), polypropylene (PP), and polyethylene (PE). The light-shielding film is preferably a heat-shrinkable cylindrical film.

  The contents filled in the product of the present invention are not particularly limited, and in addition to the beer described above, alcohol such as sake and wine, soft drinks such as sports drinks, vegetable juice and smoothies are filled. be able to. Moreover, it is not limited to a drink, You may fill a shampoo, rinse, cosmetics, a pharmaceutical, etc.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples.

<Example 1>
(Step of preparing the preform 10a)
Using an injection molding machine, a preform 10a having the shape shown in FIG. 7 and having a multilayer structure made of PET / MXD-6 + oxidation accelerator / PET was produced. The content of the oxidation accelerator was 1% by mass.
The weight of this preform 10a was 30.0 g, and its length Y was 90 mm.

(Process for preparing the heat-shrinkable plastic member 40a)
A mixture containing polyethylene and a brown colorant as a polyolefin-based resin was extruded from a ring-shaped die. Next, the extruded tube inner surface was pressurized, or the tube outer surface was subjected to negative pressure from the inner surface to expand the diameter, thereby producing a heat-shrinkable plastic member 40a.
The content of the brown colorant in the colored layer was 5% by mass.
When the near-infrared transmittance of the heat-shrinkable plastic member 40a was measured using a spectroscope manufactured by Hamamatsu Photonics, it was 70%.
The length X of the produced heat-shrinkable plastic member 40a was 100 mm.

(Fitting process)
Next, the preform 10a was fitted from one end of the heat-shrinkable plastic member 40a by manual work.

(Heat shrinkage and thermocompression process)
After fitting, the preform 10a and the heat-shrinkable plastic member 40a were heated to 100 ° C. using a hot air dryer, and the heat-shrinkable plastic member 40a was heat-shrinked. Next, using a metal plate heated to 100 ° C., the blank portion 80a was sandwiched and thermocompression bonded at a pressure of 300 N / cm ² to obtain a composite preform 70.

(Manufacture of composite containers)
The composite preform 70 obtained as described above was heated to 100 ° C. using a near-infrared heater and conveyed to a blow molding die shown in FIG. 9b. In this blow molding die, the composite preform 70 was blow-molded to obtain a composite container 10A having a full injection capacity of 500 mL.
In the container body 10, the thickness of the gas barrier layer was 30 μm, and the thicknesses of the other layers (polyester resin layer) were both 120 μm.
The thickness of the plastic member 40 was 50 μm.

When the transmittance of visible light having a wavelength of 400 to 500 nm at the body and the bottom of the composite container 10A was measured using a spectrophotometer (manufactured by Shimadzu Corporation, UV-visible spectrophotometer), both were 0.5. %Met.
Further, in accordance with the JIS K 7126 isobaric method, an oxygen gas permeability measuring device (manufactured by MOCON, trade name: OX-TRAN 2/20) is used to measure the composite container 10A under the conditions of 23 ° C. and humidity 90% RH. The oxygen transmission rate was measured and found to be 0.51 cc / m ² · day · 0.21 atm.

<Appearance test>
When the appearance of the composite container 10A after manufacture was visually evaluated, no bubbles were present between the container body 10 and the plastic member 40, and no peeling or breakage of the crimping part was observed. Thus, the bottom 30 of the container body 10 was completely covered.

<Comparative Example 1>
A composite container 10A was produced in the same manner as in Example 1 except that the brown colorant was not used to produce the heat-shrinkable plastic member 40a.
The visible light transmittance at the body and the bottom of the composite container 10A was 88%, and the oxygen transmittance was 0.51 cc / m ² · day · 0.21 atm.
Further, when the appearance was evaluated by visual observation, no bubbles were present between the container body 10 and the plastic member 40, and no peeling or breakage of the crimping portion was observed. The bottom 30 was completely covered.

<Comparative Example 2>
A composite container 10A was produced in the same manner as in Example 1 except that the thermocompression bonding of the blank portion was not performed.
The visible light transmittance at the body portion of the composite container 10A is 0.5%, the visible light transmittance at the bottom not covered with the plastic member is 88%, and the oxygen transmittance is 0.51 cc / m. ² · day · 0.21 atm.
Moreover, when the external appearance was evaluated visually, the bottom part 30 of the container main body 10 was not covered with the plastic member 40.

Claims (23)

A preform comprising a mouth, a body connected to the mouth, and a bottom connected to the body;
A heat-shrinkable plastic member having a single layer structure, which is provided so as to surround the outside of the preform and includes a resin material and a colorant;
The preform has a multilayer structure including at least a gas barrier layer;
A composite preform, wherein the heat-shrinkable plastic member has a near-infrared transmittance of 50% or more.   2. The preform according to claim 1, wherein the preform has a multilayer structure including a polyester resin layer / gas barrier layer / polyester resin layer or a polyester resin layer / gas barrier layer / polyester resin layer / gas barrier layer / polyester resin layer. Composite preform.   The composite preform according to claim 1 or 2, wherein the gas barrier layer included in the composite preform includes an oxidation accelerator and / or an oxygen absorbent.   The composite preform according to any one of claims 1 to 3, wherein the colorant is a brown pigment, and the content of the preform is 0.1% by mass or more and 30% by mass or less.   The composite preform according to any one of claims 1 to 4, wherein one end of the heat-shrinkable plastic member on the bottom side of the preform is crimped.   The composite preform according to claim 5, wherein the crimped portion of the heat-shrinkable plastic member is twisted to form a twisted portion.   The composite preform according to any one of claims 1 to 6, wherein the heat-shrinkable plastic member has at least one notch at one end of the heat-shrinkable plastic member that is close to the mouth of the preform. . A composite container which is a blow molded product of the composite preform according to any one of claims 1 to 7,
A mouth, a neck provided below the mouth, a shoulder provided below the neck, a trunk provided below the shoulder, and a bottom provided below the trunk. A container body comprising,
A heat-shrinkable plastic member having a single layer structure provided in close contact with the outside of the container body;
With
The container body has a multilayer structure including at least a gas barrier layer;
One end of the heat-shrinkable plastic member on the bottom side of the container body is crimped to form a bottom part.   The composite container according to claim 12 for filling beer as the content, wherein the visible light transmittance at a wavelength of 400 to 500 nm is 20% or less.   The composite container according to claim 8 or 9, wherein a bottom shape of the container body is a petaloid shape.   The composite container according to any one of claims 8 to 10, wherein a label is attached to the container body and / or the heat-shrinkable plastic member.   The composite container according to claim 11, wherein the label is a shrink label, a stretch label, a roll label, a tack label, or a paper label.   The composite container according to claim 11 or 12, wherein the label is printed. A method for producing the composite preform according to any one of claims 1 to 7,
Preparing a preform and a heat-shrinkable plastic member;
Fitting the preform from one end of the heat-shrinkable plastic member;
Heating the preform and the heat-shrinkable plastic member to heat-shrink the heat-shrinkable plastic member;
A method for producing a composite preform, comprising: The heat-shrinkable plastic member has a blank portion at the end opposite to the end where the fitting has been performed,
The method according to claim 14, further comprising a step of thermocompression bonding the margin.   The method according to claim 15, further comprising twisting the thermocompression-bonded blank portion to form a twisted portion.   The method according to any one of claims 14 to 16, further comprising a step of preheating the preform before the fitting step.   The method according to any one of claims 15 to 18, further comprising a step of providing a notch in the heat-shrinkable plastic member.   The method according to any one of claims 14 to 18, further comprising a step of sterilizing the preform and / or the plastic member before and / or after the fitting step. It is a manufacturing method of the composite container according to any one of claims 8 to 13,
Heating the composite preform according to any one of claims 1 to 7 and inserting it into a blow mold; and
And a step of expanding the preform and the heat-shrinkable plastic member integrally by performing blow molding on the composite preform after heating. A product obtained by filling the composite container according to any one of claims 8 to 13 with contents,
A product, characterized in that a cap is screwed onto the mouth of the container body. The mouth portion has a flange portion;
The product of claim 21, wherein the cap comprises an overcap covering the flange portion.   The product according to claim 21 or 22, further comprising a light-shielding film covering the cap.