JP7037772B2 - Composite containers and their manufacturing methods, composite preforms, and plastic components - Google Patents

Description

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

Recently, plastic bottles have become common as bottles for containing the contents of foods and drinks, and such plastic bottles contain the contents.

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

By the way, in the conventional biaxial stretch blow molding method, a container shape is formed by using a preform containing, for example, a single layer material such as PET or PP, a multilayer material or a blend material. However, in the conventional biaxial stretch blow molding method, it is general that the preform is simply molded into a container shape. Therefore, when the container is to have various functions and properties (barrier property, heat retention property, etc.), the means thereof is limited, for example, changing the material constituting the preform. In particular, it is difficult to give different functions and characteristics depending on the part of the container (for example, the body and the bottom).

Japanese Unexamined Patent Publication No. 2009-241526

The present invention has been made in consideration of such points, and a composite container and a manufacturing method thereof, a composite preform, and a plastic member capable of imparting various functions and characteristics to the container can be provided. The purpose is to provide.

The present invention relates to a method for manufacturing a composite container.
The process of preparing a preform made of plastic material,
A step of providing a plastic member entirely colored in a predetermined color on the outside of the preform, and
The step of heating the preform and the plastic member and inserting them into the blow molding die, and
A step of integrally expanding the preform and the plastic member by performing blow molding on the preform and the plastic member in the blow molding die is provided.
A method for manufacturing a composite container, wherein the plastic member contains a resin material and a colorant.

The present invention is a method for manufacturing a composite container, characterized in that the predetermined color is brown, black, green, white, blue or red.

The present invention is a method for producing a composite container, wherein the colorant is a light-reflecting colorant and / or a light-absorbing colorant.

The present invention is characterized in that the light-reflecting colorant is a light-reflecting pigment selected from the group consisting of titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin and talc. This is a method for manufacturing a composite container.

The present invention is a method for producing a composite container, wherein the light-absorbing colorant is a light-absorbing pigment selected from the group consisting of carbon black, ceramic black and bone black.

The present invention is a composite preform.
Preform made of plastic material and
It is provided with a plastic member provided so as to surround the outside of the preform and the whole thereof is colored in a predetermined color.
The plastic member is a composite preform characterized in that it is in close contact with the outside of the preform and contains a resin material and a colorant.

The present invention is a composite preform characterized in that the predetermined color is brown, black, green, white, blue or red.

The present invention is a composite preform characterized in that the colorant is a light-reflecting colorant and / or a light-absorbing colorant.

The present invention is characterized in that the light-reflecting colorant is a light-reflecting pigment selected from the group consisting of titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin and talc. It is a compound preform to be used.

The present invention is a composite preform in which the light-absorbing colorant is a light-absorbing pigment selected from the group consisting of carbon black, ceramic black and bone black.

The present invention relates to a composite container.
The container body made of plastic material and
It is provided in close contact with the outside of the container body, and is provided with a plastic member whose entire body is colored in a predetermined color.
The container body and the plastic member are integrally expanded by blow molding and are expanded.
The plastic member is a composite container characterized by containing a resin material and a colorant.

The present invention is a composite container characterized in that the predetermined color is brown, black, green, white, blue or red.

The present invention is a composite container characterized in that the colorant is a light-reflecting colorant and / or a light-absorbing colorant.

The present invention is characterized in that the light-reflecting colorant is a light-reflecting pigment selected from the group consisting of titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin and talc. It is a composite container.

The present invention is a composite container characterized in that the light-absorbing colorant is a light-absorbing pigment selected from the group consisting of carbon black, ceramic black and bone black.

The present invention provides a composite container having the preform and a plastic member in close contact with the outside of the preform by being mounted so as to surround the outside of the preform and being heated integrally with the preform. It is a plastic member for manufacturing,
It has at least a tubular body covering the body of the preform and has a tubular body.
The whole is colored in a predetermined color,
It is a plastic member characterized by containing a resin material and a colorant.

The present invention is a plastic member characterized in that the predetermined color is brown, black, green, white, blue or red.

The present invention is a plastic member, characterized in that the colorant is a light-reflecting colorant and / or a light-absorbing colorant.

The present invention is characterized in that the light-reflecting colorant is a light-reflecting pigment selected from the group consisting of titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin and talc. It is a plastic member.

The present invention is a plastic member characterized in that the light-absorbing colorant is a light-absorbing pigment selected from the group consisting of carbon black, ceramic black and bone black.

According to the present invention, the composite preform and the plastic member are integrally expanded by performing blow molding on the composite preform in the blow molding mold. Therefore, the preform (container body) and the plastic member can be composed 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. can. Further, since the entire plastic member is colored in a predetermined color, visible light in a desired wavelength range can be cut (absorbed or reflected), and the content is filled in the composite container by visible light. It is possible to prevent the problem that the object is denatured.

FIG. 1 is a partial vertical sectional view showing a composite container according to the first embodiment of the present invention. FIG. 2 is a horizontal sectional view (a sectional view taken along line II-II of FIG. 1) showing a composite container according to the first embodiment of the present invention. FIG. 3 is a vertical sectional view showing a composite preform according to the first embodiment of the present invention. 4 (a) to 4 (d) are perspective views showing various plastic members. 5 (a) to 5 (f) are schematic views showing a blow molding method according to the first embodiment of the present invention. 6 (a) to 6 (f) are schematic views showing a blow molding method according to a modified example of the first embodiment of the present invention. 7 (a) to 7 (g) are schematic views showing a blow molding method according to a modification of the first embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a modified example of the composite container according to the first embodiment of the present invention. FIG. 9 is a vertical sectional view showing a modified example of the composite preform according to the first embodiment of the present invention. 10 (a) to 10 (f) are schematic views showing a modified example of the blow molding method according to the first embodiment of the present invention. FIG. 11 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 12 is a horizontal sectional view (XII-XII line sectional view of FIG. 11) showing a composite container according to a second embodiment of the present invention. FIG. 13 is a vertical sectional view showing a composite preform according to the second embodiment of the present invention. 14 (a) to 14 (d) are perspective views showing various inner label members and various plastic members. 15 (a) to 15 (f) are schematic views showing a blow molding method according to a second embodiment of the present invention. 16 (a) to 16 (f) are schematic views showing a blow molding method according to a modified example of the second embodiment of the present invention. 17 (a) to 17 (g) are schematic views showing a blow molding method according to a modification of the second embodiment of the present invention. FIG. 18 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention. FIG. 19 is a vertical sectional view showing a modified example of the composite preform according to the second embodiment of the present invention. 20 (a) to 20 (f) are schematic views showing a modified example of the blow molding method according to the second embodiment of the present invention.

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

First, with reference to FIGS. 1 and 2, the outline of the composite container produced by the blow molding method according to the present embodiment will be described. In the present specification, "upper" and "lower" mean upper and lower parts of the composite container 10A in an upright state (FIG. 1), respectively.

As will be described later, the composite container 10A shown in FIGS. 1 and 2 is biaxially stretched with respect to the composite preform 70 (see FIG. 3) including the preform 10a and the plastic member 40a using a blow molding die 50. It is obtained by integrally expanding the preform 10a and the plastic member 40a of the composite preform 70 by performing blow molding.

Such a composite container 10A includes a container body 10 made of a plastic material located inside and a plastic member 40 provided in close contact with the outside of the container body 10.

Of 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 body portion 20 provided below the shoulder portion 12, and a body. It is provided with a bottom portion 30 provided below the portion 20.

On the other hand, the plastic member 40 is entirely colored in a predetermined color, is in close contact with the outer surface of the container body 10 in a thinly stretched state, and does not easily move or rotate with respect to the container body 10. It is installed in a state.

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

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

The neck portion 13 is located between the flange portion 17 and the shoulder portion 12, and has a substantially cylindrical shape having a substantially uniform diameter. Further, the shoulder portion 12 is located between the neck portion 13 and the body portion 20, and has a shape in which the diameter gradually increases from the neck portion 13 side to the body portion 20 side.

Further, the body portion 20 has a cylindrical shape having 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 tubular shape such as a quadrangular tubular shape or an octagonal tubular shape. Alternatively, the body portion 20 may have a tubular shape having a non-uniform horizontal cross section from the upper side to the lower side. Further, in the present embodiment, the body portion 20 is not formed with irregularities and has a substantially flat surface, but the present invention is not limited 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 recess 31 located in the center and a grounding portion 32 provided around the recess 31. The shape of the bottom portion 30 is not particularly limited, and may have a conventionally known bottom shape (for example, a petaloid bottom shape, a round bottom shape, or the like).

The thickness of the container body 10 in the body portion 20 is not limited to this, but can be reduced to, for example, about 50 μm to 250 μm. Further, the weight of the container body 10 is not limited to this, but can be 10 g to 20 g. By reducing the wall thickness of the container body 10 in this way, the weight of the container body 10 can be reduced.

Such a container body 10 can be manufactured by biaxially stretch-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), and PC (polycarbonate) can be used. preferable. Further, the above-mentioned various resins may be blended and used. 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 thin-film 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.

Further, the container body 10 can also be formed as a multi-layer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer is provided with gas barrier properties and light-shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). As the resin (intermediate layer) to have, a preform 10a composed of three or more layers may be extruded and then blow-molded to form a multi-layer bottle having gas barrier properties and light-shielding properties. As the intermediate layer, a resin blended with the above-mentioned various resins may be used.

Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foamed preform having a foamed cell diameter of 0.5 to 100 μm is formed, and this foamed preform is blow molded. Thereby, the container main body 10 may be manufactured. Since such a container body 10 has a built-in foam cell, it is possible to enhance the light-shielding property of the entire container body 10.

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

Next, the plastic member 40 will be described. The plastic member 40 (40a) is provided so as to surround the outside of the preform 10a as described later, and is obtained by being brought into close contact with the outside of the preform 10a and then biaxially stretched and blow molded together with the preform 10a. It was done.

The plastic member 40 (40a) contains a resin material and a colorant, and the whole thereof is colored in a predetermined color. Predetermined colors include brown, black, green, white, blue and red. In the present specification, for example, the plastic member 40 (40a) colored "brown" includes a brown and transparent plastic member 40 (40a) and an opaque plastic member 40 (40a). ) And the translucent plastic member 40 (40a). Since the entire plastic member is colored in a predetermined color, visible light in a desired wavelength range can be cut (absorbed or reflected), and the content liquid filled in the composite container 10A by visible light. It is possible to prevent the problem that the light is denatured. For example, when beer is filled as a content, it is required to cut visible light having a wavelength of 400 to 500 nm. In this case, by coloring the entire plastic member 40 (40a) in brown, visible light having a wavelength of 400 to 500 nm can be cut off, and degeneration of beer as a content can be prevented. In the present specification, the visible light means a light having a wavelength of 380 nm to 800 nm. Further, the transmittance of visible light can be measured by a method according to JIS A5759. For example, using a spectrophotometer (UV3100, manufactured by Shimadzu Corporation), the light transmittance of the visible light wavelength can be obtained by measuring at intervals of 0.5 nm in the wavelength range of 220 to 800 nm.

The plastic member 40 is attached to the outer surface of the container body 10 without being adhered, and is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. Further, as shown in FIG. 2, the plastic member 40 is provided over the entire circumferential direction so as to surround the container main body 10, and has a substantially circular horizontal cross section.

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

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

On the other hand, since the plastic member 40 is not welded or adhered to the container body 10, it can be peeled off from the container body 10 and removed. Specifically, for example, the plastic member 40 may be cut off using a knife or the like, or the plastic member 40 may be provided with a cutting line (not shown in advance) and the plastic member 40 may be peeled off along the cutting line. can. As a result, the printed plastic member 40 can be separated and removed from the container body 10, so that the colorless and transparent container body 10 can be recycled as in the conventional case.

Such a plastic member 40a may have no shrinking action on the preform 10a, or may have a shrinking action. After blow molding, the plastic member 40a has an action of shrinking with respect to the preform 10a from the viewpoint that the amount of air entering between the container body 10 and the plastic member 40 is small, that is, the adhesion is high. It is preferably a shrinkable tube.

When the plastic member 40a has an action of contracting with respect to the preform 10a, the plastic member (shrink tube) 40a is provided on the outside of the preform 10a and is heated integrally with the preform 10a. It was obtained by axial stretching blow molding. The plastic member (shrinkable tube) 40a may be any as long as it has an action of shrinking with respect to the preform 10a. The plastic member (shrinkable tube) 40a itself may have shrinkage or elasticity and may be shrinkable without applying an external action. Alternatively, the plastic member (shrinkable tube) 40a may be one that shrinks (for example, heat shrinks) with respect to the preform 10a when an external action (for example, heat) is applied.

The thickness of the plastic member 40 is not limited to this, but can be, for example, about 5 μm to 50 μm when attached to the container body 10.

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

As shown in FIG. 3, the composite preform 70 includes a preform 10a made of a plastic material and a bottomed cylindrical plastic member 40a provided on the outside of the preform 10a.

Of 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 11a corresponds to the mouth portion 11 of the container body 10 described above, and has substantially the same shape as the mouth portion 11. Further, the body portion 20a corresponds to the neck portion 13, the shoulder portion 12 and the body portion 20 of the container body 10 described above, and has a substantially cylindrical shape. The bottom portion 30a corresponds to the bottom portion 30 of the container body 10 described above, and has a substantially hemispherical shape.

The plastic member 40a is entirely colored in a predetermined color, is attached to the outer surface of the preform 10a without being adhered, and is in close contact with the preform 10a so as not to move or rotate. It is in close contact to the extent that it does not fall due to its own weight. The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

In this case, the plastic member 40a is provided so as to cover the entire area of the body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a.

The plastic member 40a may be provided in the entire area or a part of the area other than the mouth portion 11a. For example, the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a. Further, the number of the plastic members 40a is not limited to one, and a plurality of plastic members 40a may be provided. For example, two plastic members 40a may be provided at two locations on the outer side of the body portion 20a, respectively.

Such a plastic member 40a may have no shrinking action on the preform 10a, or may have a shrinking action.

In the former case, the plastic member 40a includes, for example, a blow tube manufactured by blow molding, a sheet molding tube manufactured by sheet molding (for example, deep drawing molding), an extrusion tube manufactured by extrusion molding, and inflation molding. The manufactured inflation molding tube, injection molding tube and the like can be used, but the present invention is not limited to this, and a molding method other than the above may be used.

On the other hand, when the plastic member (shrink tube) 40a has an action of contracting, the plastic member (shrink tube) 40a has an action against the preform 10a, for example, when an external action (for example, heat) is applied. Those that shrink (for example, heat shrink) may be used. Alternatively, the plastic member (shrinkable tube) 40a itself may have shrinkage or elasticity and may be shrinkable without applying an external action.

The plastic member 40 (40a) includes a resin material and a colorant. Further, the plastic member 40 (40a) may be made of a single layer or may be made of multiple layers. When the plastic member 40 (40a) is composed of multiple layers, the resin material that is the main constituent of each layer may be the same or different between the innermost surface layer and the outermost surface layer. Specific layer configurations include, for example, low-density PE + colorant / adhesive layer / EVOH / adhesive layer / low-density PE + colorant, PP + colorant / adhesive layer / EVOH / adhesive layer / PP + coloring from the innermost surface. Examples include those of agents. When the plastic member 40 (40a) is composed of multiple layers, the colorant can be contained in any layer of the plastic member 40 (40a). For example, it can be included in the adhesive layer as long as the adhesiveness is not impaired. Examples of the adhesive constituting the adhesive layer include a polyvinyl acetate adhesive, a polyacrylic acid ester adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, and a polyester adhesive. Examples thereof include agents, polyamide adhesives, polyimide adhesives, amino resin adhesives, phenol resin adhesives, epoxy adhesives, polyurethane adhesives, rubber adhesives, silicone adhesives and the like.

As the colorant, a colorant such as brown, black, green, white, blue or red can be used, and it may be used alone or in combination of two or more. The colorant may be a pigment or a dye, but is preferably a pigment from the viewpoint of light resistance. Further, among the pigments, light-reflecting pigments and light-absorbing pigments are preferable. Examples of the light-reflecting pigment include titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin, and talc, and examples of the light-absorbing pigment include carbon black, ceramic black, and bone black. And so on. Since the plastic member 40 (40a) contains a light-reflecting colorant and / or a light-absorbing colorant, visible light in a wider wavelength range can be cut, and the content to be filled in the composite container 10A. It is possible to prevent degeneration of objects. Among the above-mentioned colorants, light-absorbing pigments such as black and brown are more preferable because the visible light transmittance of the plastic member 40 can be significantly reduced. When the plastic member 40 (40a) is composed of multiple layers, the number of layers containing the colorant may be two or more.

When the plastic member 40 (40a) has a single layer, the content of the colorant is 0.01 to 10 parts by mass with respect to 100 parts by mass of the resin material contained in the plastic member 40 (40a). It is preferably 0.1 to 3.0 parts by mass, more preferably 0.5 to 2.0 parts by mass. When the plastic member 40 (40a) has multiple layers, it is preferably 0.01 to 10 parts by mass, preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the resin material contained in the layer containing the colorant. It is more preferably 3.0 parts by mass, and even more preferably 0.5 to 2.0 parts by mass.

Further, the plastic member 40 (40a), for example, polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, polyvinyl chloride, polyvinylidene chloride, poly. Vinyl acetate, polyvinyl alcohol (eg, ethylene-vinyl alcohol copolymer (EVOH)), polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluororesin, methyl polymethacrylate, polyacrylic acid, methyl polyacrylate, poly Acrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylenepropylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6, nylon 6,6, polymethoxylylen adipamide ( MXD-6), aromatic polyamide, polycarbonate, ethylene polyterephthalate, butylene polyterephthalate, ethylene polynaphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyetherketone, polyetheretherketone, unsaturated polyester, alkyd It contains a resin material including a resin, a polyimide, a polysulfone, a polyphenylene sulfide, a polyethersulfone, a silicone resin, a polyurethane, a phenol resin, a urea resin, a polyethylene oxide, a polypropylene oxide, a polyacetal, an epoxy resin and the like. Of these, it is preferable to include a thermoplastic inelastic resin such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Further, the resin material may contain a copolymer obtained by polymerizing two or more monomer units constituting the above-mentioned resin. Further, the resin material may contain two or more of the above-mentioned resins. Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foaming member having a foam cell diameter of 0.5 to 100 μm is used, and this foam preform is formed. , The light blocking effect can be enhanced.

Further, the plastic member 40 (40a) may contain the same material as the container body 10 (preform 10a). When the plastic member 40 (40a) is composed of multiple layers, the plastic member 40 (40a) may be provided with a layer made of the same material as the container body 10 (preform 10a). In this case, the plastic member 40 can be placed mainly on the portion of the composite container 10A where the strength is desired to be increased, and the strength of the portion can be selectively increased. For example, a plastic member 40 may be provided around the shoulder portion 12 and the bottom portion 30 of the container body 10 to increase the strength of this portion. Examples of such a material include thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate).

Further, the plastic member 40 (40a) may contain a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. When the plastic member 40 (40a) is composed of multiple layers, the plastic member 40 (40a) may be provided with a layer made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, without using a multi-layer preform or a preform containing a blended material as the preform 10a, the gas barrier property of the composite container 10A is enhanced, oxygen intrusion into the container is prevented, 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 prevent the content from being reduced. For example, the plastic member 40 may be provided in the entire area of the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container main body 10 to enhance the gas barrier property of this portion. As such a material, PE (polyethylene), PP (polypropylene), MXD-6, EVOH (ethylene vinyl alcohol copolymer) or an oxygen absorber such as a fatty acid salt may be mixed with these materials.

Further, the plastic member 40 (40a) may contain a material that blocks light rays such as ultraviolet rays. Further, when the plastic member 40 (40a) is composed of multiple layers, the plastic member 40 (40a) may be provided with a layer made of a material that blocks light rays such as ultraviolet rays. In this case, it is possible to prevent the content liquid from being deteriorated by ultraviolet rays or the like without using a multilayer preform, a preform containing a blend material, or the like as the preform 10a. For example, the plastic member 40a may be provided in the entire area of the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container main body 10 to improve the ultraviolet ray blocking performance of this portion. As such a material, a blended material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered. Further, a foaming member having a foam cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, may be used.

Further, the plastic member 40 (40a) may contain a material having higher heat retention or cold retention (material having lower thermal conductivity) than the plastic material constituting the container body 10 (preform 10a). When the plastic member 40 (40a) is composed of multiple layers, the plastic member 40 (40a) is a material (heat conduction) having higher heat retention or cold retention than the plastic material constituting the container body 10 (preform 10a). It may be provided with a layer made of (low-quality material). 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. As a result, the heat-retaining property or the cold-retaining property of the composite container 10A is enhanced. For example, a plastic member 40 may be provided on all or part of the body 20 of the container body 10 to improve the heat retention or cold retention of the body 20. Further, when the user grips the composite container 10A, it is prevented from becoming difficult to hold the composite container 10A due to being too hot or too cold. As such a material, foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. Further, a foaming member having a foam cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, may be used. It is preferable to mix hollow particles with the resin material containing these resins. The average particle size of the hollow particles is preferably 1 to 200 μm, 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. Further, the hollow particles may be organic hollow particles made of resin or the like, or inorganic hollow particles made of glass or the like, but they are organic because of their excellent dispersibility. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include a styrene resin such as crosslinked styrene-acrylic resin, a (meth) acrylic resin such as acrylonitrile-acrylic resin, a phenol resin, a fluorine resin, a polyamide resin, and a polyimide. Examples thereof include based resins, polycarbonate resins, and polyether resins. In addition, Low Pay HP-1055, Low Pay HP-91, Low Pay OP-84J, Low Pay Ultra, Low Pay SE, Low Pay ST (manufactured by Roam and Hearth Co., Ltd.), Nipole MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782. , SX866 (manufactured by JSR Co., Ltd.) and other commercially available hollow particles can also be used. When the plastic member 40a is composed of a single layer, the content of the hollow particles is preferably 0.01 to 50 parts by mass with respect to 100 parts by mass of the resin material contained in the plastic member 40a. It is more preferably 1 to 20 parts by mass. When the plastic member 40a is composed of multiple layers, the amount is preferably 0.01 to 50 parts by mass and 1 to 20 parts by mass with respect to 100 parts by mass of the resin material contained in the layer containing hollow particles. Is more preferable.

Further, the plastic member 40 (40a) may contain a material that is less slippery than the plastic material constituting the container body 10 (preform 10a). When the plastic member 40 (40a) is composed of multiple layers, the plastic member 40 (40a) is provided with a layer made of a material that is less slippery than the plastic material constituting the container body 10 (preform 10a) as the outermost layer. You may have. In this case, the user can easily grip the composite container 10A without changing the material of the container body 10. For example, the plastic member 40 may be provided on all or part of the body 20 of the container body 10 to make it easier to hold the body 20.

Further, in the plastic member 40 (40a), various additives may be added in addition to the above-mentioned resin as the main component as long as the characteristics are not impaired. Additives include, for example, plasticizers, UV stabilizers, anticoloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, thread friction reducing agents, slip agents, mold release agents, anti-inflammatory agents. Excipients, ion exchangers, coloring pigments and the like can be added. Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foaming member having a foam cell diameter of 0.5 to 100 μm is used, and this foam preform is formed. , The light blocking effect can be enhanced.

Further, the plastic member 40 (40a) may be designed or printed. In this case, it is possible to display images and characters on the composite container 10A without separately attaching a label or the like to the container body 10 after blow molding. For example, a plastic member 40 may be provided on all or part of the body 20 of the container body 10, and an image or characters may be displayed on the body 20. The printing may be formed by designing or printing on the plain plastic member 40a by a printing method such as an inkjet method, a gravure printing method, an offset printing method, or a flexographic printing method. For example, when the inkjet method is used, a UV curable ink is applied to the plastic member 40a, UV irradiation is performed on the plastic member 40a, and the ink is cured to form a print layer. This printing may be applied to the plastic member (shrink tube) 40a before being attached to the preform 10a, or may be applied in a state where the plastic member 40a is provided on the outside of the preform 10a. Further, printing may be applied to the plastic member 40 of the composite container 10A after blow molding. As the material of the 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.

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

As shown in FIGS. 3 and 4A, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. May be. In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, various functions and characteristics can be imparted to the bottom portion 30 in addition to the body portion 20 of the composite container 10A. Examples of such a plastic member 40a include the blow tube and the sheet forming tube described above.

Further, as shown in FIGS. 9 (described later) and 4 (b), the plastic member 40a has a circular tube shape (bottomless cylindrical shape) as a whole, even if it has a cylindrical body portion 41. good. In this case, as the plastic member 40a, for example, the blow tube, the extrusion tube, the inflation molding tube, and the sheet molding tube described above can be used.

Further, as shown in FIGS. 4 (c) and 4 (d), the plastic member 40a may be manufactured by forming a film into a cylindrical shape and laminating its ends. In this case, as shown in FIG. 4 (c), the plastic member 40a may be configured in a tube shape (bottomless cylindrical shape) having a body portion 41, and as shown in FIG. 4 (d). It may be configured into a bottomed cylinder shape by sticking the bottom portions 42 together. In this case, as the plastic member 40a, for example, a blow tube, an extrusion tube, an inflation molding tube, or a sheet molding tube can be used.

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

In one embodiment, the plastic member 40a can be manufactured by molding a resin sheet containing a resin material and a colorant. Examples of the molding method include deep drawing molding, or a method of molding a resin sheet into a tube shape and fusing or adhering its ends. Further, the multi-layered plastic member 40a is formed by molding a laminated resin sheet in which a resin sheet and another resin sheet containing a resin material and, if desired, a colorant are laminated via the above-mentioned adhesive. Obtainable.

The resin sheet may be a commercially available product, or may be produced by a conventionally known method. In the present invention, it is preferably produced by extrusion molding, and it is preferable that the extrusion molding is performed by a T-die method or an inflation method.

For example, the resin sheet can be molded by extrusion molding by the following method. After the above-mentioned resin material is dried, it is supplied to a melt extruder heated to a temperature (Tm) to Tm + 70 ° C. above the melting point of the thermoplastic resin to heat and melt the resin material, for example, T-die or the like. A resin sheet can be formed by extruding a sheet-like material from a die and quenching and solidifying the extruded sheet-like material with a rotating cooling drum or the like. As the melt extruder, a single-screw extruder, a twin-screw extruder, a vent extruder, a tandem extruder and the like can be used depending on the purpose.

The heating temperature is preferably 170 to 230 ° C., more preferably 180 to 220 ° C. in the inflation method, preferably 180 to 300 ° C., and more preferably 210 to 270 ° C. in the T-die method.
The above resin material is, for example, 0.3 to 30 g / 10 minutes, preferably 0.3 to 8 g / 10 minutes by the inflation method, 0.3 to 6 g / 10 minutes, and preferably 0.3 to 0.3 by the T-die method. It has a melt flow rate (MFR) of 20 g / 10 min, more preferably 4-15 g / 10 min. The melt flow rate is a value measured by the method A under the conditions of a temperature of 190 ° C. and a load of 21.18 N in the method specified in JIS K7210-1995. When the MFR of the resin material is 0.3 g / 10 minutes or more, the extrusion load during the molding process can be reduced. Further, when the MFR of the resin material is 30 g / 10 minutes or less, the mechanical strength of the resin sheet made of the resin material can be increased.

In one embodiment, the plastic member 40a can also be manufactured by extruding a mixture of a heat-melted resin material and a colorant into a tube shape. The multi-layered plastic member 40a can be obtained by co-extruding this mixture with another resin material. Further, the plastic member 40a can also be obtained by extruding the mixture in a mold and then blow molding the mixture in the mold so as to expand the diameter along the inner surface of the mold.

Further, one end of the tube obtained by extruding the above mixture is closed by adhesion, welding or the like. A tube with one end closed is placed in a tubular mold having an inner diameter larger than the outer diameter of the tube, and a blow device is placed at the other end of the tube. At this time, it is preferable that the blow device is in close contact with the tube so that air does not leak between them. Next, the tube, the mold, and the blow device are sent into the heating furnace in this arrangement, and heated to 70 to 150 ° C. inside the heating furnace. As the heating furnace, a hot air circulation type heating furnace may be used in order to keep the inside thereof at a uniform temperature. Alternatively, the tubes, molds and blowers may be passed through the heated liquid to heat them. Next, the tube, the mold and the blow device are taken out from the heating furnace, and the inner surface of the tube is pressure-stretched by ejecting air from the blow device into the tube. As a result, the tube expands and the diameter is expanded along the inner surface shape of the mold. After that, the tube is cooled in cold water while the air is blown out from the blow device, and the tube is taken out from the mold. By cutting this into a desired size, a shrinkable plastic member 40a can be obtained.

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

Next, the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 5A to 5F.

First, a preform 10a made of a plastic material is prepared (see FIG. 5A). In this case, the preform 10a may be produced by an injection molding method using, for example, an injection molding machine (not shown). Further, as the preform 10a, a preform generally used in the past may be used.

Next, by providing the plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is produced (FIG. 5 (FIG. 5). b) See). In this case, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member 40a is attached so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

In this case, the plastic member 40a having the same or slightly smaller inner diameter as the outer diameter of the preform 10a may be pushed into the preform 10a so as to be brought into close contact with the outer surface of the preform 10a. Alternatively, as will be described later, a heat-shrinkable plastic member 40a is provided on the outer surface of the preform 10a, and the plastic member 40a is heat-shrinked by heating to 50 ° C. to 100 ° C. to cause the outer surface of the preform 10a. It may be in close contact with.

In this way, a series of steps for producing the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a in advance to prepare the composite preform 70 (FIGS. 5A to 5B). )) And a series of steps (FIGS. 5 (c) to (f)) for producing the composite container 10A by blow molding can be carried out at different places (factory or the like).

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

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

The composite container 10A is molded using the blow molding die 50. In this case, the blow molding die 50 includes a pair of body molds 50a and 50b separately divided from each other, and a bottom mold 50c (see FIG. 5D). In FIG. 5D, 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. 5 (e), after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the pair of body molds 50a and 50b and the bottom mold 50c are sealed. The blow-molded mold 50 is configured. Next, air is press-fitted into the preform 10a, and biaxial stretch blow molding is performed on the composite preform 70.

As a result, the container body 10 can be obtained from the preform 10a 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 molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded. As a result, the preform 10a and the plastic member 40a are integrally shaped into a shape corresponding to the inner surface of the blow molding die 50.

In this way, a composite container 10A including the container body 10 and the plastic member 40 provided on the outer surface of the container body 10 can be obtained.

Next, as shown in FIG. 5 (f), the pair of body molds 50a and 50b and the bottom mold 50c are separated from each other, and the composite container 10A is taken out from the blow molding mold 50.

Modification Example of Manufacturing Method of Composite Container 10A Next, a modification of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 6A to 6F. The modified examples shown in FIGS. 6 (a) to 6 (f) have the action of shrinking the plastic member (shrink tube) 40a with respect to the preform 10a, and the other configurations are shown in FIGS. 5 (a) to 5 (a). It is substantially the same as the form shown in (f). In FIGS. 6A to 6F, the same parts as those in FIGS. 5A to 5F are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 6A).

Next, a plastic member (shrink tube) 40a is provided on the outside of the preform 10a (see FIG. 6 (b)). In this case, the plastic member (shrink tube) 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member (shrinkable tube) 40 is attached so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

Next, the preform 10a and the plastic member (shrink tube) 40a are heated by the heating device 51 (see FIG. 6 (c)). At this time, the preform 10a and the plastic member (shrinkable tube) 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 plastic member (shrink tube) 40a in this heating step may be, for example, 90 ° C to 130 ° C.

When the plastic member (shrink tube) 40a is heated in this way, the plastic member (shrink tube) 40a is thermally shrunk and comes into close contact with the outside of the preform 10a (see FIG. 6 (c)). When the plastic member (shrinkable tube) 40a itself has shrinkage, the plastic member (shrinkage) is formed at the time when the plastic member (shrinkage tube) 40a is provided on the outside of the preform 10a (see FIG. 6B). The tube) 40a may be in close contact with the outside of the preform 10a.

Subsequently, the preform 10a and the plastic member (shrink tube) 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 6D).

The preform 10a and the plastic member (shrinkable tube) 40a are molded by using the blow molding die 50, and the container body 10 and the container body 10 and the plastic member (shrink tube) 40a are formed in substantially the same manner as in the cases of FIGS. 5 (a) to 5 (f) described above. A composite container 10A provided with a plastic member (shrink tube) 40 provided on the outer surface of the container body 10 can be obtained (see FIGS. 6 (d) to 6 (f)).

Next, other modifications of the blow molding method (method for manufacturing the composite container 10A) according to the present embodiment will be described with reference to FIGS. 7 (a) to 7 (g). In the modification shown in FIGS. 7 (a) to 7 (g), the plastic member (shrink tube) 40a has an action of shrinking with respect to the preform 10a, and the preform 10a and the plastic member (shrink tube) 40a are 2 It is heated in stages, and other configurations are substantially the same as those shown in FIGS. 5 (a) to 5 (f). In FIGS. 7A to 7G, the same parts as those in FIGS. 5A to 5F are designated by the same reference numerals, and detailed description thereof will be omitted.

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

Next, a plastic member (shrink tube) 40a is provided on the outside of the preform 10a (see FIG. 7B). In this case, the plastic member (shrink tube) 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member (shrinkable tube) 40 is attached so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

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

When the plastic member (shrink tube) 40a is heated, the plastic member (shrink tube) 40a is thermally shrunk and comes into close contact with the outside of the preform 10a. As a result, a composite preform 70 having a preform 10a and a plastic member (shrink tube) 40a in close contact with the outside of the preform 10a is obtained (see FIG. 7 (c)).

In this way, the composite preform 70 is produced by heating and closely contacting the plastic member (shrink tube) 40a on the outside of the preform 10a in advance using the first heating device 55 to prepare the composite preform 70. A series of steps for manufacturing (FIGS. 7 (a) to (c)) and a series of steps for manufacturing the composite container 10A by blow molding (FIGS. 7 (d) to (g)) are performed at different locations (factory, etc.). It will be possible to carry out at.

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

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

The composite preform 70 is molded using the blow molding die 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 cases of FIGS. 5A to 5F described above. A composite container 10A provided with a shrink tube (shrink tube) 40 is obtained (see FIGS. 7 (e) to 7 (g)).

As described above, according to the present embodiment, the preform 10a of the composite preform 70 and the plastic member 40a are integrally formed by performing blow molding on the composite preform 70 in the blow molding mold 50. To prepare a composite container 10A having a container body 10 and a plastic member 40. As a result, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be made of separate members. Therefore, various functions and characteristics can be freely imparted to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

Further, according to the present embodiment, when the composite container 10A is manufactured, a general blow molding apparatus can be used as it is, so that it becomes necessary to prepare a new molding facility for manufacturing the composite container 10A. do not have.

Further, according to the present embodiment, since the plastic member 40 includes at least a layer containing a resin material and a light-reflecting colorant and / or a light-absorbing colorant, the plastic member 40 is visible. It is possible to reduce the light transmittance and prevent the problem that the content liquid filled in the composite container 10A is denatured by visible light.

Modifications Next, modifications of the first embodiment of the present invention will be described with reference to FIGS. 8, 9 and 10 (a) to 10 (f).

The modified examples shown in FIGS. 8, 9 and 10 (a) to 10 (f) do not have a body and a bottom as the plastic member 40a, but use a cylindrical plastic member 40a. ..

In the composite container 10A shown in FIG. 8, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20, but does not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 9, the plastic member 40a is in close contact so as to cover only the body portion 20a of the preform 10a, and more specifically, the neck portion 13 of the container body 10 in the body portion 20a. It covers the area excluding the portion corresponding to the portion 13a and the portion corresponding to the lower portion of the body portion 20a.

The other configurations in FIGS. 8, 9 and 10 (a) to 10 (f) are substantially the same as the embodiments shown in FIGS. 1 to 5. In the modified examples shown in FIGS. 8, 9 and 10 (a) to 10 (f), the same parts as those of the embodiments shown in FIGS. 1 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

In addition, since the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiments shown in FIGS. 1 to 5, detailed description thereof will be omitted. Further, in FIGS. 8, 9 and 10 (a) to 10 (f), those having an action of shrinking the plastic member 40 with respect to the preform 10a may be used.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 11 to 20 are views showing a second embodiment of the present invention. In FIGS. 11 to 20, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

First, with reference to FIGS. 11 and 12, the outline of the composite container produced by the blow molding method according to the present embodiment will be described.

As will be described later, the composite container 10A shown in FIGS. 11 and 12 is formed into a composite preform 70 (see FIG. 13) including a preform 10a, an inner label member 60a, and a plastic member 40a by using a blow molding die 50. On the other hand, it is obtained by integrally expanding the preform 10a, the inner label member 60a, and the plastic member 40a of the composite preform 70 by performing biaxial stretch blow molding.

Such a composite container 10A is provided in close contact with a container body 10 made of a plastic material located inside, an inner label member 60 provided in close contact with the outside of the container body 10, and an inner label member 60 provided in close contact with the outside of the inner label member 60. It is provided with a plastic member 40.

Of 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 body portion 20 provided below the shoulder portion 12, and a body. It is provided with 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.

Further, the plastic member 40 includes at least a layer containing a resin material and a light-reflecting colorant and / or a light-absorbing colorant, and is thinly extended on the outer surface of the container body 10 and the outer surface of the inner label member 60. It is in close contact with the container body 10 so as not to easily move or rotate.

It is considered that at least a part of the plastic member 40 is translucent or transparent, and 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. The inner label member 60 (60a) is provided so as to surround the outside of the preform 10a as described later, and is obtained by biaxially stretch blow molding integrally with the preform 10a and the 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 adhered, 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. 12, 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 body portion 20, and the bottom portion 30 of the container body 10, excluding the mouth portion 11 and the neck portion 13. As a result, desired characters, images, and the like can be added to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, and the composite container 10A can be decorated or displayed with information.

The inner label member 60 may be provided in the entire area or a part of the container body 10 other than the mouth portion 11. For example, the inner label member 60 may be provided so as to cover the entire neck portion 13, shoulder portion 12, body portion 20, and bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of inner label members 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 area as the plastic member 40, or may be provided in a narrower area than the plastic member 40. In the latter case, it is preferred that the inner label member 60 is completely covered by the plastic member 40.

The thickness of the inner label member 60 is not limited to this, but can be, for example, about 5 μm to 50 μm when attached to the container body 10.

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

The plastic member 40 is attached to the outer surface of the inner label member 60 without being adhered, and is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is thinly stretched on the outer surface of the inner label member 60 to cover the inner label member 60. As shown in FIG. 12, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

In addition, since the configurations of the container body 10 and the plastic member 40 are substantially the same as those of the first embodiment described above, detailed description thereof will be omitted here.

Next, with reference to FIG. 13, the configuration of the composite preform according to the present embodiment will be described.

As shown in FIG. 13, the composite preform 70 includes a preform 10a made of a plastic material, a bottomed cylindrical inner label member 60a provided in close contact with the outer side of the preform 10a, and an inner label member 60a. It is provided with a bottomed cylindrical plastic member 40a provided in close contact with the outside.

The inner label member 60a is in close contact with the outer surface of the preform 10a, and is in close contact with the preform 10a in a state where it does not easily move or rotate. 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 pre-designed or printed. For example, in addition to the design, product name, and the like, 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 attaching a label or the like to the container body 10 after blow molding. For example, an inner label member 60a may be provided on all or a part of the body portion 20a of the preform 10a so that an image or characters can be displayed on the body portion 20 of the container body 10 after molding. This eliminates the need for a step of attaching a label using a labeler after sealing the container, so that the manufacturing cost can be suppressed and the yield can be prevented from being lowered.

As such an inner label member 60a, a film such as a polyester resin, a polyamide resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, or a 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, as the inner label member 60a, various materials described below can also be used.

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, it is possible to improve the gas barrier property of the composite container 10A and prevent the content liquid from being deteriorated by oxygen or water vapor without using a multilayer preform, a preform containing a blend material, or the like as the preform 10a. As such a material, PE (polyethylene), PP (polypropylene), MXD-6, EVOH (ethylene vinyl alcohol copolymer) or an oxygen absorber such as a fatty acid salt may be mixed with these materials.

Further, the inner label member 60a may be made of a material having a light ray barrier property such as ultraviolet rays. In this case, without using a multi-layer preform or a preform containing a blended material as the preform 10a, the light barrier property of the composite container 10A is enhanced, oxygen is prevented from entering the container, and the content liquid is deteriorated. It is possible to prevent the evaporation of water vapor from the inside of the container to the outside and prevent the content from being reduced. As such a material, a blended 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 (material having low thermal conductivity) having higher heat retention or cold retention than the plastic material constituting the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. As a result, the heat-retaining property or the cold-retaining property of the composite container 10A is enhanced. As such a material, foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. Further, it preferably contains hollow particles. The average particle size of the hollow particles is preferably 1 to 200 μm, more preferably 5 to 80 μm. Further, the hollow particles may be organic hollow particles made of resin or the like, or inorganic hollow particles made of glass or the like, but they are organic because of their excellent dispersibility. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include those similar to those described above. Further, the above-mentioned commercially available hollow particles can also be used. The content of the hollow particles is preferably 0.01 to 50 parts by mass, more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the resin contained in the inner label member 60a.

On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without being adhered to the preform 10a so as not to move or rotate. The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

In this case, the inner label member 60a and the plastic member 40a are provided so as to cover the entire area of the body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a.

The inner label member 60a and the plastic member 40a may be provided in the entire area or a part of the area other than the mouth portion 11a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a. Further, the inner label member 60a and the plastic member 40a are not limited to one each, and a plurality of them may be provided. For example, two inner label members 60a and a plastic member 40a may be provided at two locations on the outer side of the body portion 20a, respectively.

Such a plastic member 40a may have no shrinking action on the preform 10a, or may have a shrinking action.

In the latter case, the plastic member (shrinkable tube) 40a may be any as long as it has an action of shrinking with respect to the preform 10a. As the plastic member (shrink tube) 40a, it is preferable to use one that shrinks (for example, heat shrinks) with respect to the preform 10a when an external action (for example, heat) is applied.

In addition, since the configurations of the preform 10a and the plastic member 40a are substantially the same as those of the first embodiment described above, detailed description thereof will be omitted here.

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

As shown in FIGS. 13 and 14 (a), the plastic member 40a (inner label member 60a) has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 (body portion 61) and a body portion 41. It may have a bottom portion 42 (bottom portion 62) connected to (body portion 61). In this case, since the bottom portion 42 (bottom portion 62) of the plastic member 40a (inner label member 60a) covers the bottom portion 30a of the preform 10a, various functions are provided for the bottom portion 30 in addition to the body portion 20 of the composite container 10A. And characteristics can be given.

Further, as shown in FIGS. 19 (described later) and 14 (b), the plastic member 40a (inner label member 60a) has a circular tube shape (bottomless cylindrical shape) as a whole, and has a cylindrical body portion 41. (Body portion 61) may be provided. In this case, as the plastic member 40a (inner label member 60a), for example, an extrusion tube can be used.

Further, as shown in FIGS. 14 (c) and 14 (d), the plastic member 40a (inner label member 60a) may be manufactured by forming a film into a cylindrical shape and pasting the ends thereof. good. In this case, as shown in FIG. 14 (c), the plastic member 40a may be configured in a tube shape (bottomless cylindrical shape) having a body portion 41 (body portion 61), and is formed in FIG. 14 (d). As shown in the above, the bottom portion 42 (bottom portion 62) may be bonded to form a bottomed cylinder shape.

Next, the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 15 (a) to 15 (f).

First, a preform 10a made of a plastic material is prepared (see FIG. 15A).

Next, the inner label member 60a is provided on the outer side of the preform 10a, and the plastic member 40a is provided on the outer side of the inner label member 60a. As a result, a composite preform 70 having a preform 10a, an inner label member 60a adhered to the outside of the preform 10a, and a plastic member 40a adhered to the outside of the inner label member 60a is produced (FIG. 15). (B)). In this case, the inner label member 60a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 61 and a bottom portion 62 connected to the body portion 61.

At this time, even if the inner label member 60a and the plastic member 40a having the same or slightly smaller inner diameter as the outer diameter of the preform 10a are pushed against the preform 10a, they are brought into close contact with the outer surface of the preform 10a. good. Alternatively, a heat-shrinkable inner label member 60a and a plastic member 40a are provided on the outer surface of the preform 10a, and the inner label member 60a and the plastic member 40a are heat-shrinked by heating to 50 ° C to 100 ° C. It may be in close contact with the outer surface of the preform 10a.

Further, a plastic member 40a may be provided around the inner label member 60a in advance, and the inner label member 60a and the plastic member 40a may be integrally mounted on the outside of the preform 10a. Alternatively, the inner label member 60a may be provided on the outer side of the preform 10a, and then the plastic member 40a may be provided on the outer side of the inner label member 60a.

In this way, a series of steps for producing the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a and the inner label member 60a in advance to prepare the composite preform 70 (FIG. 15 (FIG. 15). It becomes possible to carry out a series of steps (FIGS. 15 (d) to (f)) for producing the composite container 10A by blow molding at different places (factory or the like).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 15 (c)).

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50. The composite container 10A is molded by using the blow molding die 50, and is provided on the container main body 10 and the inner label member on the outer surface of the container main body 10 in substantially the same manner as in the case of the first embodiment described above. A composite container 10A including the 60 and a plastic member 40 provided on the outside of the inner label member 60 is obtained (see FIGS. 15 (d)-(f)).

In addition, since the method for manufacturing the composite container 10A (blow molding method) according to the present embodiment is substantially the same as that for the first embodiment described above, detailed description thereof will be omitted here.

Modification Example of Manufacturing Method of Composite Container 10A Next, a modification of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 16A to 16F. The modified examples shown in FIGS. 16 (a) to 16 (f) have a function of contracting the plastic member (shrink tube) 40a with respect to the preform 10a, and other configurations are shown in FIGS. 15 (a) to 15 (a). It is substantially the same as the form shown in (f). In FIGS. 16A to 16F, the same parts as those in FIGS. 15A to 15F are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 16A).

Next, the inner label member 60a is provided on the outer side of the preform 10a, and the plastic member (shrink tube) 40a is provided on the outer side of the inner label member 60a (see FIG. 16B). The inner label member 60a and the plastic member (shrinkable tube) 40a are mounted so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a. At least a part of the plastic member (shrink tube) 40a may be translucent or transparent.

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

Next, the preform 10a, the inner label member 60a, and the plastic member (shrink tube) 40a are heated by the heating device 51 (see FIG. 16C). At this time, the preform 10a, the inner label member 60a, and the plastic member (shrink tube) 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 plastic member (shrink tube) 40a in this heating step may be, for example, 90 ° C to 130 ° C.

When the plastic member (shrink tube) 40a is heated in this way, the plastic member (shrink tube) 40a is thermally shrunk and comes into close contact with the outside of the preform 10a (see FIG. 16C). When the plastic member (shrink tube) 40a itself has shrinkage, the plastic member (see FIG. 16B) at the time when the plastic member (shrink tube) 40a is provided on the outside of the inner label member 60a. The shrinkable tube) 40a may be in close contact with the outside of the inner label member 60a.

Subsequently, the preform 10a, the inner label member 60a, and the plastic member (shrink tube) 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 16D).

The preform 10a, the inner label member 60a, and the plastic member (shrinkable tube) 40a are molded by using the blow molding mold 50, and in substantially the same manner as in the cases of FIGS. 15 (a) to 15 (f) described above. A composite container 10A including a container main body 10, an inner label member 60 provided on the outer surface of the container main body 10, and a plastic member (shrink tube) 40 provided on the outer side of the inner label member 60 can be obtained (FIG. 16 (d) to (f)).

Next, other modifications of the method for manufacturing the composite container 10A (blow molding method) according to the present embodiment will be described with reference to FIGS. 17 (a) to 17 (g). In the modification shown in FIGS. 17 (a) to 17 (g), the plastic member (shrink tube) 40a has an action of shrinking with respect to the preform 10a, and the preform 10a and the plastic member (shrink tube) 40a are 2 It is heated in stages, and other configurations are substantially the same as those shown in FIGS. 15 (a) to 15 (f). In FIGS. 17 (a) to 17 (g), the same parts as those in FIGS. 15 (a) to 15 (f) are designated by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of a plastic material is prepared (see FIG. 17A).

Next, the inner label member 60a is provided on the outer side of the preform 10a, and the plastic member (shrink tube) 40a is provided on the outer side of the inner label member 60a (see FIG. 17B). The plastic member (shrinkable tube) 40a is attached so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a. At least a part of the plastic member (shrink tube) 40a may be translucent or transparent.

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

Next, the preform 10a, the inner label member 60a, and the plastic member (shrink tube) 40a are heated by the first heating device 55 (see FIG. 17C). At this time, the heating temperature of the preform 10a, the inner label member 60a, and the plastic member (shrink tube) 40a may be, for example, 50 ° C to 100 ° C.

When the plastic member (shrink tube) 40a is heated, the plastic member (shrink tube) 40a is thermally shrunk and comes into close contact with the outside of the preform 10a. As a result, a composite preform 70 having a preform 10a, an inner label member 60 in close contact with the outside of the preform 10a, and a plastic member (shrink tube) 40a in close contact with the outside of the inner label member 60a is obtained. (See FIG. 17 (c)).

In this way, the composite preform 70 is produced by heating and closely contacting the plastic member (shrink tube) 40a on the outside of the preform 10a and the inner label member 60a in advance using the first heating device 55. A series of steps for producing the composite preform 70 (FIGS. 17 (a) to (c)) and a series of steps for producing the composite container 10A by blow molding (FIGS. 17 (d) to (g)) are separated. It will be possible to carry out at a place (factory, etc.).

Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 17 (d)). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a, the inner label member 60a, and the plastic member (shrink tube) 40a in this heating step may be, for example, 90 ° C to 130 ° C.

Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 17 (e)).

The composite preform 70 is molded using the blow molding die 50, and is provided on the container main body 10 and the outer surface of the container main body 10 in substantially the same manner as in the cases of FIGS. 15 (a) to 15 (f) described above. A composite container 10A including the inner label member 60 and the plastic member (shrink tube) 40 provided on the outer side of the inner label member 60 can be obtained (see FIGS. 17 (e) to 17 (g)).

As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding mold 50, the preform 10a of the composite preform 70, the inner label member 60a, and the plastic The manufacturing member 40a is integrally expanded to manufacture a composite container 10A including the container body 10, the inner label member 60, and the plastic member 40. Therefore, the inner label member 60 can be provided in advance on 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 step of filling the composite container 10A with the content liquid, sealing the container, and then attaching a label by a labeler. As a result, the manufacturing cost for manufacturing the final product can be suppressed.
In addition, it is possible to prevent the yield from being lowered when the final product is manufactured due to a defect of the labeler or the like.

Further, according to the present embodiment, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be made of separate members. Therefore, various functions and characteristics can be freely imparted to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

Further, according to the present embodiment, when the composite container 10A is manufactured, a general blow molding apparatus can be used as it is, so that it becomes necessary to prepare a new molding facility for manufacturing the composite container 10A. do not have.

Modifications Next, modifications of the present invention will be described with reference to FIGS. 18, 19 and 20 (a) to 20 (f).

The modifications shown in FIGS. 18, 19 and 20 (a) to 20 (f) do not have a body and a bottom as the inner label member 60a and the plastic member 40a, but have a cylindrical inner label member 60a and a cylindrical inner label member 60a. The plastic member 40a is used.

In the composite container 10A shown in FIG. 18, the inner label member 60 and the plastic member 40 extend from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20, but do not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 19, the inner label member 60a and the plastic member 40a are in close contact with each other so as to cover only the body portion 20a of the preform 10a. It covers the area excluding the portion 13a corresponding to the neck portion 13 of the main body 10 and the portion corresponding to the lower portion of the body portion 20a.

The other configurations in FIGS. 18, 19 and 20 (a) to 20 (f) are substantially the same as the embodiments shown in FIGS. 11 to 15. In the modified examples shown in FIGS. 18, 19 and 20 (a) to 20 (f), the same parts as those of the embodiments shown in FIGS. 11 to 15 are designated by the same reference numerals, and detailed description thereof will be omitted.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiments shown in FIGS. 11 to 15, so detailed description thereof will be omitted. Further, in FIGS. 18, 19 and 20 (a) to 20 (f), those having an action of shrinking the plastic member 40 with respect to the preform 10a may be used.

Claims (16)

In the method of manufacturing a composite container
The process of preparing a preform made of plastic material,
A step of providing a plastic member entirely colored in a predetermined color on the outside of the preform, and
The step of heating the preform and the plastic member and inserting them into the blow molding die, and
A step of integrally expanding the preform and the plastic member by performing blow molding on the preform and the plastic member in the blow molding die is provided.
The plastic member comprises a resin material and a colorant.
The plastic member is composed of multiple layers.
The plastic member has a layer structure from the innermost surface, which is a low-density polyethylene containing the colorant / adhesive layer / ethylene vinyl alcohol copolymer / adhesive layer / low-density polyethylene containing the colorant, or the innermost surface. Contains a layer structure of polypropylene containing the colorant / adhesive layer / ethylene vinyl alcohol copolymer / adhesive layer / polypropylene containing the colorant .
A method for producing a composite container , wherein the plastic member contains a light-reflecting colorant and a light-absorbing colorant as the colorant . The method for manufacturing a composite container according to claim 1, wherein the predetermined color is brown, black, green, white, blue or red. The light-reflecting colorant is a light-reflecting pigment selected from the group consisting of titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin and talc. Alternatively, the method for producing a composite container according to 2 . The composite container according to any one of claims 1 to 3, wherein the light-absorbing colorant is a light-absorbing pigment selected from the group consisting of carbon black, ceramic black and bone black. Production method. In compound preform,
Preform made of plastic material and
It is provided with a plastic member provided so as to surround the outside of the preform and the whole thereof is colored in a predetermined color.
The plastic member is in close contact with the outside of the preform and comprises a resin material and a colorant.
The plastic member is composed of multiple layers.
The plastic member has a layer structure from the innermost surface, which is a low-density polyethylene containing the colorant / adhesive layer / ethylene vinyl alcohol copolymer / adhesive layer / low-density polyethylene containing the colorant, or the innermost surface. Contains a layer structure of polypropylene containing the colorant / adhesive layer / ethylene vinyl alcohol copolymer / adhesive layer / polypropylene containing the colorant .
The plastic member is a composite preform characterized by containing a light-reflecting colorant and a light-absorbing colorant as the colorant . The composite preform according to claim 5 , wherein the predetermined color is brown, black, green, white, blue or red. 5. The light-reflecting colorant is a light-reflecting pigment selected from the group consisting of titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin and talc. Or the composite preform according to 6 . The composite preform according to any one of claims 5 to 7, wherein the light-absorbing colorant is a light-absorbing pigment selected from the group consisting of carbon black, ceramic black and bone black. .. In a composite container
The container body made of plastic material and
It is provided in close contact with the outside of the container body, and is provided with a plastic member whose entire body is colored in a predetermined color.
The container body and the plastic member are integrally blow molded products.
The plastic member comprises a resin material and a colorant.
The plastic member is composed of multiple layers.
The plastic member has a layer structure from the innermost surface, which is a low-density polyethylene containing the colorant / adhesive layer / ethylene vinyl alcohol copolymer / adhesive layer / low-density polyethylene containing the colorant, or the innermost surface. Contains a layer structure of polypropylene containing the colorant / adhesive layer / ethylene vinyl alcohol copolymer / adhesive layer / polypropylene containing the colorant .
The plastic member is a composite container characterized by containing a light-reflecting colorant and a light-absorbing colorant as the colorant . The composite container according to claim 9 , wherein the predetermined color is brown, black, green, white, blue or red. 9. The light-reflecting colorant is a light-reflecting pigment selected from the group consisting of titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin and talc. Or the composite container according to 10 . The composite container according to any one of claims 9 to 11, wherein the light-absorbing colorant is a light-absorbing pigment selected from the group consisting of carbon black, ceramic black and bone black. For making a composite container having the preform and a plastic member in close contact with the outside of the preform by being mounted so as to surround the outside of the preform and being heated integrally with the preform. It ’s a plastic member,
It has at least a tubular body covering the body of the preform and has a tubular body.
The whole is colored in a predetermined color,
It contains a resin material and a colorant,
It consists of multiple layers
From the innermost surface, a layer structure of low-density polyethylene containing the colorant / adhesive layer / ethylene vinyl alcohol copolymer / adhesive layer / low-density polyethylene containing the colorant, or from the innermost surface, the colorant. It contains a layer structure of polypropylene / adhesive layer / ethylene vinyl alcohol copolymer / adhesive layer / polypropylene containing the colorant .
The plastic member is characterized by containing a light-reflecting colorant and a light-absorbing colorant as the colorant . The plastic member according to claim 13 , wherein the predetermined color is brown, black, green, white, blue or red. 13. The light-reflecting colorant is a light-reflecting pigment selected from the group consisting of titanium white, aluminum powder, mica powder, zinc sulfide, zinc oxide, calcium carbonate, kaolin and talc. Or the plastic member according to 14 . The plastic member according to any one of claims 13 to 15, wherein the light-absorbing colorant is a light-absorbing pigment selected from the group consisting of carbon black, ceramic black and bone black. ..

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