JP7234097B2 - BLOW MOLDING METHOD, COMPOSITE PREFORM, COMPOSITE CONTAINER, AND PLASTIC PARTS - Google Patents

Description

The present invention relates to blow molding methods, composite preforms, composite containers, and plastic parts.

2. Description of the Related Art In recent years, plastic bottles have become popular as bottles for containing liquids such as food and drink, and liquids are contained in such plastic bottles.

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

By the way, in the conventional biaxial stretch blow molding method, for example, a preform containing a single-layer material such as PET or PP, a multi-layer material, or a blend material is used to form a container shape. However, in conventional biaxial stretch blow molding processes, it is common to simply mold the preform into a container shape. Therefore, when various functions and properties (barrier properties, heat retention, etc.) are to be imparted to the container, the means for doing so are limited, for example, by changing the material constituting the preform. In particular, it is difficult to give different functions and characteristics to different parts of the container (for example, the body and the bottom).

JP 2009-241526 A

The present invention has been made in consideration of such points, and provides a blow molding method, a composite preform, a composite container, and a plastic member that can impart various functions and characteristics to the container. intended to provide

The present invention relates to a blow molding method for molding a composite container,
providing a preform made of plastic material;
A step of providing an injection-molded plastic member on the outside of the preform;
heating the preform and the plastic member and inserting them into a blow mold;
Blow molding the preform and the plastic member in the blow molding mold to expand the preform and the plastic member as one. The method.

In the present invention, the preform has a mouth portion, a body portion, and a bottom portion, and the plastic member is provided so as to cover the body portion and the bottom portion of the preform, Blow molding method.

In the present invention, the preform has a mouth portion, a body portion and a bottom portion, and the plastic member is provided so as to cover a part of the body portion and the bottom portion of the preform. It is characterized by a blow molding method.

The present invention is a blow molding method, wherein the plastic member has gas barrier properties or light barrier properties.

The present invention is a blow molding method, wherein the plastic member has gas barrier properties or light barrier properties.

The present invention is a blow molding method, wherein the plastic member is provided with a design or print.

The present invention is a blow molding method, wherein the plastic member is made of a material having a higher heat insulating property or cold insulating property than the plastic material constituting the preform.

The present invention is a blow molding method, wherein the plastic member is made of a material that is less slippery than the plastic material that constitutes the preform.

The present invention further comprises the step of providing an inner label member so as to surround the outside of the preform,
The blow molding method is characterized in that the plastic member is provided outside the inner label member.

The present invention provides a composite preform,
a preform made of plastic material;
an injection-molded plastic member provided to surround the outside of the preform,
The composite preform is characterized in that the plastic member is closely attached to the outside of the preform.

In the present invention, the preform has a mouth portion, a body portion and a bottom portion, and the plastic member is provided so as to cover the body portion and the bottom portion of the preform. It is a preform.

In the present invention, the preform has a mouth portion, a body portion, and a bottom portion, and the plastic member is provided so as to cover a part of the body portion and the bottom portion of the preform. A composite preform characterized by:

The present invention is a composite preform, wherein the plastic member has gas barrier properties or light barrier properties.

The present invention is a composite preform characterized in that the plastic member is provided with a design or print.

The present invention is a composite preform, wherein the plastic member is made of a material having a higher heat insulating property or cold insulating property than the plastic material constituting the preform.

The present invention is a composite preform, wherein the plastic member is made of a material that is less slippery than the plastic material that constitutes the preform.

The present invention further comprises an inner label member provided in close contact so as to surround the outer side of the preform,
The composite preform is characterized in that the plastic member is provided in close contact with the outer side of the inner label member.

The present invention provides a composite container,
a container body made of plastic material;
and an injection-molded plastic member provided in close contact with the outside of the container body,
The composite container is characterized in that the container body and the plastic member are integrally expanded by blow molding.

In the present invention, the container body has a mouth portion, a neck portion, a shoulder portion, a body portion and a bottom portion, and the plastic member comprises the neck portion, the shoulder portion, the body portion and the bottom portion of the container body. It is a composite container characterized in that it is provided so as to cover the

In the present invention, the container body has a mouth portion, a neck portion, a shoulder portion, a trunk portion, and a bottom portion, and the plastic member comprises the neck portion, the shoulder portion, the trunk portion, and the bottom portion of the container body. The composite container is provided so as to cover a part of the container.

The present invention is a composite container, wherein the plastic member has gas barrier properties or light barrier properties.

The present invention is a composite container, wherein a design or print is applied to the plastic member.

The present invention is a composite container, wherein the plastic member is made of a material having higher heat retention or cold retention than the plastic material constituting the container body.

The present invention is a composite container, wherein the plastic member is made of a material that is less slippery than the plastic material that constitutes the container body.

The present invention further comprises an inner label member provided in close contact so as to surround the outer side of the container body,
The composite container is characterized in that the plastic member is provided in close contact with the outside of the inner label member.

The present invention provides a composite container having the preform and a plastic member adhered to the outside of the preform by being mounted so as to surround the outside of the preform and being integrally heated together with the preform. A plastic member for making,
the plastic member has a cylindrical body covering at least the body of the preform;
The plastic member is characterized in that the plastic member is an injection molded product.

According to the present invention, the preform and the plastic member of the composite preform are expanded together by subjecting the composite preform to blow molding in a blow molding die. Therefore, the preform (container body) and the plastic member can be constructed from separate members, and by appropriately selecting the type and shape of the plastic member, various functions and characteristics can be imparted to the composite container. can. In addition, since the plastic member is an injection-molded product, the design of the plastic member can be finely controlled by changing the mold, and the plastic member can be made to have a higher adhesion to the container body. can.

1 is a partial vertical sectional view showing a composite container according to a first embodiment of the present invention; FIG. FIG. 2 is a horizontal cross-sectional view (cross-sectional view taken along the line II-II in FIG. 1) showing the composite container according to the first embodiment of the present invention; 3 is a vertical sectional view showing a composite preform according to a first embodiment of the invention; FIG. FIG. 4 is a perspective view showing various plastic members; FIG. 5 is a schematic diagram of an injection molding apparatus used to manufacture a plastic member; 6(a) to 6(f) are schematic diagrams showing a blow molding method according to a first embodiment of the present invention; FIG. 7 is a partial vertical sectional view showing a modified example of the composite container according to the first embodiment of the present invention; FIG. FIG. 8 is a vertical sectional view showing a modified example of the composite preform according to the first embodiment of the present invention; 9A to 9F are schematic diagrams showing modifications of the blow molding method according to the first embodiment of the present invention; FIG. FIG. 10 is a partial vertical cross-sectional view showing a composite container according to a second embodiment of the present invention; 11 is a horizontal cross-sectional view (cross-sectional view along line XI-XI in FIG. 10) showing a composite container according to a second embodiment of the present invention; FIG. 12 is a vertical sectional view showing a composite preform according to a second embodiment of the invention; FIG. 13 is a perspective view showing various inner label members and various plastic members; 14(a) to (f) are schematic diagrams showing a blow molding method according to a second embodiment of the present invention; FIG. FIG. 15 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention; FIG. 16 is a vertical sectional view showing a modification of the composite preform according to the second embodiment of the present invention; 17(a) to (f) are schematic diagrams showing modifications of the blow molding method according to the second embodiment of the present invention.

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings. 1 to 9 are diagrams showing a first embodiment of the present invention.

First, with reference to FIGS. 1 and 2, an outline of a composite container manufactured by a blow molding method according to this embodiment will be described. In this specification, the terms "upper" and "lower" respectively refer to the upper and lower sides when the composite container 10A is erected (FIG. 1).

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

Such a composite container 10A comprises an inner container body 10 made of a plastic material 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 portion 20 provided below the shoulder portion 12. and a bottom portion 30 provided below the portion 20 .

On the other hand, the plastic member 40 is closely attached to the outer surface of the container body 10 in a thinly stretched state, and is attached to the container body 10 in a state in which it cannot be easily moved or rotated.

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

Of these, the mouth portion 11 has a threaded portion 14 to be screwed onto a cap (not shown) and a flange portion 17 provided below the threaded portion 14 . In addition, 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 with a substantially uniform diameter. The shoulder portion 12 is positioned between the neck portion 13 and the body portion 20 and has a shape whose diameter gradually increases from the neck portion 13 side toward the body portion 20 side.

Furthermore, the trunk portion 20 has a cylindrical shape with a substantially uniform diameter as a whole. However, the shape is not limited to this, and the trunk portion 20 may have a polygonal tubular shape such as a quadrangular tubular shape or an octagonal tubular shape. Alternatively, the body 20 may have a cylindrical shape with a non-uniform horizontal cross-section from top to bottom. Moreover, in the present embodiment, the trunk portion 20 has no irregularities and has a substantially flat surface, but the surface is not limited to this. For example, the body portion 20 may be formed with unevenness such as panels or grooves.

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 also not particularly limited, and may have a conventionally known bottom portion shape (for example, a petaloid bottom shape, a round bottom shape, or the like).

Also, the thickness of the container body 10 at the trunk portion 20 is not limited to this, but can be made as thin as about 50 μm to 250 μm, for example. Furthermore, 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 produced by biaxially stretching and blow-molding a preform 10a (injection-molded product) produced by injection-molding a synthetic resin material (described later).
As the material of the preform 10a, that is, the container body 10, thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate) can be used. preferable. Moreover, you may blend and use the various resin mentioned above. The container body 10 may be colored in red, blue, yellow, green, brown, black, white, or the like, but is preferably colorless and transparent in consideration of ease of recycling. Further, a deposited 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 improve the barrier properties 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 made of MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), PEN (polyethylene naphthalate), etc., with gas barrier properties and light shielding properties. A multilayer bottle having gas barrier properties and light shielding properties may be formed by extruding a preform 10a composed of three or more layers as a resin (intermediate layer) and then blow-molding it. As the intermediate layer, a resin obtained by blending the various resins described above may be used.

In addition, 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. Thus, the container body 10 may be produced. Since such a container body 10 incorporates foam cells, the light shielding property of the entire container body 10 can be enhanced.

Although the full filling volume of such a container body 10 is not particularly limited, it may consist of a bottle of 100 ml to 2000 ml, for example. Alternatively, the container body 10 may be a large bottle with a full filling volume of, for example, 10L to 60L.

Next, the plastic member 40 will be described. The plastic member 40 (40a) is an injection-molded product, which is provided so as to surround the outside of the preform 10a as described later. It is obtained by molding.

The plastic member 40 is attached to the outer surface of the container body 10 without being adhered, and is so closely attached to the container body 10 that it does not move or rotate, or is so closely attached that it does not fall under its own weight. 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. 3, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

In this case, the plastic member 40 is provided so as to cover the shoulder portion 12 , body portion 20 and bottom portion 30 of the container body 10 excluding the mouth portion 11 and 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. FIG.

In addition, the plastic member 40 may be provided in the entire area or a partial area of the container body 10 other than the mouth portion 11 . For example, the plastic member 40 may be provided so as to entirely cover the neck portion 13 , the shoulder portion 12 , the body portion 20 and the bottom portion 30 of the container body 10 excluding the mouth portion 11 . Furthermore, the number of plastic members 40 is not limited to one, and a plurality of members may be provided. For example, two plastic members 40 may be provided on the outer surface of shoulder 12 and the outer surface of bottom 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 using a knife or the like, or a cutting line (not shown) may be provided on the plastic member 40 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.

Also, 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 this embodiment will be described with reference to FIG.

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

Among them, the preform 10a includes a mouth portion 11a, a trunk portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the trunk portion 20a. Of these, the mouth portion 11 a corresponds to the mouth portion 11 of the container body 10 described above, and has substantially the same shape as the mouth portion 11 .
The trunk portion 20a corresponds to the neck portion 13, the shoulder portion 12 and the trunk 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 attached to the outer surface of the preform 10a without being glued, and is in such close contact with the preform 10a that it does not move or rotate, or in such close contact that it does not fall under its own weight. . The plastic member 40a surrounds the preform 10a over its entire circumferential direction 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.

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

The plastic member 40 (40a) is made of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), ethylene vinyl acetate copolymer (EVA), ethylene vinyl alcohol copolymer, for example. (EVOH), poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluorine Resin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluorine Rubber, Nylon 6, Nylon 6,6, Nylon MXD6, Aromatic polyamide, Polycarbonate, Polyethylene terephthalate, Polybutylene terephthalate, Polynaphthalene ethylene, U polymer, Liquid crystal polymer, Modified polyphenylene ether, Polyether ketone, Polyether Resin materials containing ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyethersulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin, etc. can be made using Among these, it is preferable to include thermoplastic inelastic resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Moreover, the resin material may contain a copolymer obtained by polymerizing two or more monomer units constituting the above-described resin. Furthermore, the resin material may contain two or more of the above resins. In addition, by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, a foamed member having a foamed cell diameter of 0.5 to 100 μm is used, and this foamed preform is molded. , the light-shielding property can be enhanced.

Also, the plastic member 40a may contain a coloring agent. When the plastic member 40a is a single layer, the content of the coloring agent is preferably 0.01 to 10% by mass, more preferably 0.1 to 3.0% by mass, with respect to the total amount of the resin material. is more preferable, and 0.5 to 2.0% by mass is even more preferable. Further, when the plastic member 40a is composed of multiple layers, it is preferably 0.01 to 10% by mass, more preferably 0.1 to 3.0% by mass, based on the total amount of the resin material contained in the layer containing the colorant. is more preferable, and 0.5 to 2.0% by mass is even more preferable. If the content of the colorant is within the above numerical range, the change in resin performance can be suppressed as much as possible, and the color tone can be stably molded.

Colorants such as brown, black, green, white, blue or red colorants can be used. The coloring agent may be a pigment or a dye, but a pigment is preferable from the viewpoint of light resistance. Among the above-described colorants, light-reflecting pigments such as titanium white, aluminum powder, mica powder, zinc sulfide, zinc white, calcium carbonate, kaolin, and talc, and light-absorbing pigments such as carbon black, Colored pigments such as ceramic black and bone black are preferred. By including pigments such as these in the colored layer, it is possible to reduce the transmittance of visible light of the plastic member 40 after blow molding, thereby preventing quality deterioration of the content liquid filled in the composite container 10A. can do.

Further, the plastic member 40 (40a) may contain various additives in addition to the above-described resins as the main component, as long as the characteristics of the plastic member 40 (40a) are not impaired. Additives include, for example, plasticizers, ultraviolet stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, thread friction reducing agents, slip agents, release agents, anti- Oxidizing agents, ion exchange agents, color pigments, and the like can be added. In addition, by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, a foamed member having a foamed cell diameter of 0.5 to 100 μm is used, and this foamed preform is molded. , the light-shielding property can be enhanced.

Further, the plastic member 40 (40a) may contain the same material as the container body 10 (preform 10a). Moreover, when the plastic member 40 (40a) consists of multiple layers, the plastic member 40 (40a) may have a layer made of the same material as the container body 10 (preform 10a). In this case, it is possible to selectively increase the strength of the portion of the composite container 10A, for example, by placing the plastic member 40 intensively in the portion where the strength is desired to be increased. For example, a plastic member 40 may be provided around the shoulder portion 12 and around the bottom portion 30 of the container body 10 to increase the strength of these portions. Examples of such materials include thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate).

Further, the plastic member 40a may contain a material having gas barrier properties such as oxygen barrier properties or water vapor barrier properties. Further, when the plastic member 40 (40a) is composed of multiple layers, the plastic member 40 (40a) may include a layer made of a material having gas barrier properties such as oxygen barrier properties or water vapor barrier properties. In this case, the gas barrier properties of the composite container 10A are improved, oxygen is prevented from entering the container, and deterioration of the liquid content is prevented without using a multi-layered preform or a preform containing a blend material as the preform 10a. In addition, evaporation of water vapor from the inside of the container to the outside can be prevented, and reduction of the content can be prevented. For example, the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container body 10 may be provided with plastic members 40 to enhance the gas barrier properties of these portions. Such materials include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), EVOH (ethylene-vinyl alcohol copolymer), or mixing these materials with oxygen absorbers such as fatty acid salts. be done.

Further, the plastic member 40a may contain a material having light barrier properties such as ultraviolet light. Moreover, when the plastic member 40 (40a) consists of multiple layers, the plastic member 40 (40a) may have a layer made of a material having a light barrier property such as ultraviolet rays. In this case, the light barrier property of the composite container 10A can be improved without using a multi-layered preform or a preform containing a blend material as the preform 10a, and deterioration of the content liquid due to ultraviolet rays or the like can be prevented. For example, the shoulder portion 12, the neck portion 13, the body portion 20, and the bottom portion 30 of the container body 10 may be provided with a plastic member 40a in order to enhance the UV barrier properties of these portions. Such a material may be a blend material or a material obtained by adding a light-shielding resin to PET, PE, or PP. Also, a foamed member having a foamed cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, may be used.

Further, the plastic member 40a may include a material (a material with low thermal conductivity) that has higher heat retention or cold insulation than the plastic material that constitutes the container body 10 (preform 10a). In addition, when the plastic member 40 (40a) is multi-layered, the plastic member 40 (40a) is made of a material (heat conductive material) 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 a material with low resistance). 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. This enhances the heat retention or cold retention of the composite container 10A. For example, the body 20 of the container body 10 may be entirely or partially provided with a plastic member 40 to enhance heat retention or cold insulation of the body 20 . Moreover, when the user grips the composite container 10A, it is possible to prevent the composite container 10A from being difficult to hold due to being too hot or too cold. Such materials include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. Also, a foamed member having a foamed cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with a melt of a 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 1-200 μm, more preferably 5-80 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 analyzer (e.g., Nanotrac particle size distribution analyzer manufactured by Nikkiso Co., Ltd.). can do. The hollow particles may be organic hollow particles made of resin or the like, or inorganic hollow particles made of glass or the like. Hollow particles are preferred. Examples of resins constituting organic hollow particles include styrene resins such as crosslinked styrene-acrylic resins, (meth)acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluorine resins, polyamide resins, and polyimides. resins, polycarbonate resins, polyether resins, and the like. In addition, Low Pake HP-1055, Low Pake HP-91, Low Pake OP-84J, Low Pake Ultra, Low Pake SE, Low Pake ST (manufactured by Rohm and Haas Co., Ltd.), Nipol MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782 , SX866 (manufactured by JSR Corporation) and other commercially available hollow particles can also be used. When the plastic member 40a is 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 20 parts by mass. When the plastic member 40a is composed of multiple layers, it 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 material contained in the layer containing the hollow particles. preferable.

Further, the plastic member 40a may contain a material that is less slippery than the plastic material that constitutes the container body 10 (preform 10a). When the plastic member 40 (40a) is multi-layered, the plastic member 40 (40a) has a layer made of a material that is less slippery than the plastic material forming the container body 10 (preform 10a) as the outermost layer. It's okay to be there. In this case, the composite container 10A can be easily gripped by the user without changing the material of the container body 10 . For example, the body 20 of the container body 10 may be entirely or partially provided with a plastic member 40 to make the body 20 easier to hold.

Further, the plastic member 40a may have a design or print. In this case, images and characters can be displayed on the composite container 10A without attaching a separate 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 trunk portion 20 of the container body 10 to display an image or characters on the trunk portion 20 . Printing may be performed by applying a design or printing to 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 using the inkjet method, a print layer can be formed by applying UV curing ink to the plastic member 40a, performing UV irradiation, and curing the ink. This printing may be applied to the plastic member 40a before being attached to the preform 10a, or may be applied while the plastic member 40a is provided outside the preform 10a. Furthermore, 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 that of the container body 10 may be used, or a material different from that of the container body 10 may be used. Moreover, the plastic member 40a may be colored in red, blue, yellow, green, brown, black, white, or the like, and may be transparent or opaque.

Next, the shape of the plastic member 40a, which is an injection molded product, will be described.

As shown in FIG. 4( a ), the plastic member 40 a may have a bottomed cylindrical shape as a whole, and may have a cylindrical trunk portion 41 and a bottom portion 42 connected to the trunk portion 41 . . In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, various functions and characteristics can be imparted to the bottom portion 30 in addition to the body portion 20 of the composite container 10A. As shown in FIG. 4(b), the plastic member 40a may have a bottomed cylindrical plastic member 40a whose bottom is cut to form a circular tubular shape (bottomless cylindrical shape) as a whole.

Next, a method of manufacturing the plastic member 40a will be described with reference to FIG.

FIG. 5 represents an injection molding apparatus 100 used to manufacture the plastic member 40a. An injection molding apparatus 100 includes an injection device 1 , a mold 2 and a mold clamping device 3 . First, a mixture containing the above resin material, colorant, etc. is heated and melted in the injection device 1 and injected into the clamped mold 2 . At this time, the heating temperature is preferably 150 to 300.degree. C., more preferably 200 to 300.degree. Then keep warm and cool. After cooling, the mold 2 is opened and the finished plastic member 40a is taken out. Also, the plastic member 40a consisting of multiple layers can be obtained by using a multi-layer injection molding machine (not shown).

The plastic member 40a may be multi-layered as described above, and for example, the innermost surface and the outermost surface may have the same or different layer configurations. Specific layer structures include low-density PE/adhesive layer/EVOH/adhesive layer/low-density PE and PP/adhesive layer/EVOH/adhesive layer/PP from the innermost surface. Such a multi-layer plastic member 40a can be produced by extruding multiple layers as described above, but can also be produced by adhering two or more single-layer plastic members 40a. can. Examples of adhesives constituting the adhesive layer include polyvinyl acetate-based adhesives, polyacrylic acid ester-based adhesives, cyanoacrylate-based adhesives, ethylene copolymer adhesives, cellulose-based adhesives, polyester-based adhesives, Examples include polyamide adhesives, polyimide adhesives, amino resin adhesives, phenol resin adhesives, epoxy adhesives, polyurethane adhesives, rubber adhesives, and silicone adhesives.

According to the above-described method, the design of the plastic member 40a can be finely controlled by changing the mold, so that the plastic member 40a having higher adhesion to the preform 40a can be obtained. can.

Next, a blow molding method (manufacturing method of the composite container 10A) according to the present embodiment will be described with reference to FIGS. 6(a) to 6(f).

First, a preform 10a made of plastic material is prepared (see FIG. 6(a)). In this case, for example, the preform 10a may be produced by an injection molding method using an injection molding machine (not shown). Further, as the preform 10a, a preform generally used conventionally may be used.

Next, by providing a plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is manufactured (FIG. 6 ( b) see). In this case, the plastic member 40 a has a bottomed cylindrical shape as a whole, and has a cylindrical trunk portion 41 and a bottom portion 42 connected to the trunk portion 41 . The plastic member 40a is attached so as to cover the entire area of the body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a.

In this case, a plastic member 40a having an inner diameter equal to or slightly smaller than the outer diameter of the preform 10a may be pressed into the preform 10a so as to adhere to the outer surface of the preform 10a.

In this way, by bonding the plastic member 40a to the outside of the preform 10a in advance to fabricate the composite preform 70, a series of steps for fabricating the composite preform 70 (Fig. 6(a) to (b) )) and a series of steps (FIGS. 6(c) to (f)) for manufacturing the composite container 10A by blow molding can be performed at separate locations (factories, etc.).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 6(c)). At this time, the composite preform 70 is evenly heated in the circumferential direction by the heating device 51 while rotating with the opening 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90.degree. C. to 130.degree.

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 6(d)).

The composite container 10A is molded using this blow molding die 50. As shown in FIG. In this case, the blow-molding mold 50 is composed of a pair of divided trunk molds 50a and 50b and a bottom mold 50c (see FIG. 6(d)). In FIG. 6(d), the pair of body molds 50a and 50b are open from 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. 6(e), after the bottom mold 50c is lowered, the pair of trunk molds 50a and 50b are closed, and the pair of trunk molds 50a and 50b and the bottom mold 50c A closed blow mold 50 is constructed. Next, air is forced into the preform 10a and the composite preform 70 is subjected to biaxial stretch blow molding.

As a result, the container body 10 is obtained from the preform 10a in the blow molding die 50. As shown in FIG. During this time, the body molds 50a, 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 expanded together. As a result, the preform 10 a and the plastic member 40 a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50 .

Thus, a composite container 10A comprising the container body 10 and the plastic member 40 provided on the outer surface of the container body 10 is obtained.

Next, as shown in FIG. 6( f ), the pair of body molds 50 a and 50 b and the bottom mold 50 c are separated from each other, and the composite container 10 A is removed from the blow molding mold 50 .

Modification Next, a modification of the first embodiment of the present invention will be described with reference to FIGS. 7 to 9. FIG.

The modification shown in FIGS. 7 to 9 uses a cylindrical plastic member 40a instead of having a trunk and a bottom as the plastic member 40a.

In the composite container 10A shown in FIG. 7, the plastic member 40 extends from the shoulder 12 of the container body 10 to the lower portion of the body 20, but does not reach the bottom 30. As shown in FIG. Further, in the composite preform 70 shown in FIG. 8, the plastic member 40a is closely attached so as to cover only the trunk portion 20a of the preform 10a. It covers the area except for the portion 13a corresponding to and the portion corresponding to the lower portion of the trunk portion 20a.

Other configurations in FIGS. 7 to 9 are substantially the same as those of the embodiment shown in FIGS. In the modification shown in FIGS. 7 to 9, the same parts as those in the embodiment shown in FIGS. 1 to 6 are denoted 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 embodiment shown in FIGS. 1 to 6, so detailed description thereof will be omitted.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 10 to 17 are diagrams showing a second embodiment of the present invention. 10 to 17, the same reference numerals are given to the same parts as in the first embodiment, and detailed description thereof will be omitted.

First, an outline of a composite container manufactured by the blow molding method according to the present embodiment will be described with reference to FIGS. 10 to 12. FIG.

The composite container 10A shown in FIG. 10 is manufactured by using a blow mold 50 to form a composite preform 70 (see FIG. 12) including the preform 10a, the inner label member 60a and the plastic member 40a, as will be described later. The preform 10a, the inner label member 60a and the plastic member 40a of the composite preform 70 are integrally expanded by axial stretching blow molding.

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

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 portion 20 provided below the shoulder portion 12. and a bottom portion 30 provided below the portion 20 .

On the other hand, the inner label member 60 is adhered to the outer surface of the container main body 10 in a thinly extended state, and is adhered to the container main body 10 so as not to be easily moved or rotated.

In addition, the plastic member 40 is adhered to the outer surface of the container body 10 and the outer surface of the inner label member 60 in a thinly extended state, and is adhered to the container body 10 so as not to be easily moved or rotated. there is

At least a portion of the plastic member 40 may be translucent or transparent, in which case the inner label member 60 is visible from the outside through the translucent or transparent portion. The plastic member 40 may be entirely translucent or transparent, or may have an opaque portion and a translucent or transparent portion (for example, window). In this embodiment, an example in which the entire plastic member 40 is transparent will be described.

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

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. 11, the inner label member 60 is provided over the entire circumference of the container body 10 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 , body portion 20 and bottom portion 30 of the container body 10 excluding the mouth portion 11 and neck portion 13 . Thus, desired characters, images, or the like can be applied 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 and information can be displayed.

Note that the inner label member 60 may be provided on the entire area or a partial area 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 excluding the mouth portion 11 . Furthermore, the inner label member 60 is not limited to one, and a plurality of inner label members 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, inner label member 60 is preferably completely covered by plastic member 40 .

In addition, 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 will be described later, and is integrally formed with the preform 10a and the inner label member 60a by biaxial stretch blow molding. It is.

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 stretched thinly on the outer surface of the inner label member 60 to cover the inner label member 60 . As shown in FIG. 11, the plastic member 40 is provided over the entire circumference of the container body 10 so as to surround it, and has a substantially circular horizontal cross section.

In addition, the configuration and manufacturing method of the container body 10 and the plastic member 40 are substantially the same as in the case of the above-described first embodiment, so detailed description thereof will be omitted here.

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

As shown in FIG. 12, 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. A bottomed cylindrical plastic member 40a is provided in close contact with the outside.

The inner label member 60a is in close contact with the outer surface of the preform 10a, and is in close contact with the preform 10a so as not to move or rotate easily. 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 predesigned or printed. For example, character information such as the name of the content liquid, the manufacturer, the name of raw materials, etc. may be described in addition to the design, product name, and the like. In this case, images and characters can be displayed on the composite container 10A without attaching a separate 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 part of the body portion 20a of the preform 10a so that an image or characters are displayed on the body portion 20 of the container body 10 after molding. This eliminates the need for a labeling step using a labeler after the container is sealed, thereby reducing the manufacturing cost and preventing a decrease in yield.

Films such as polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate resin, polyacetal resin, and fluorine resin can be used as the inner label member 60a. 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.

Various materials described below can also be used as the inner label member 60a.

For example, the inner label member 60a may be made of a material having gas barrier properties such as oxygen barrier properties or water vapor barrier properties. In this case, the gas barrier properties of the composite container 10A are improved, oxygen is prevented from entering the container, and deterioration of the liquid content is prevented without using a multi-layered preform or a preform containing a blend material as the preform 10a. In addition, evaporation of water vapor from the inside of the container to the outside can be prevented, and reduction of the content can be prevented. Such materials include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), EVOH (ethylene-vinyl alcohol copolymer), or mixing these materials with oxygen absorbers such as fatty acid salts. be done.

In addition, the inner label member 60a may be made of a material having light barrier properties such as ultraviolet rays. In this case, the light barrier property of the composite container 10A can be improved without using a multi-layered preform or a preform containing a blend material as the preform 10a, and deterioration of the content liquid due to ultraviolet rays or the like can be prevented. Such a material may be a blend material or a material obtained by adding a light-shielding resin to PET, PE, or PP.

Also, the inner label member 60a may be made of a material (a material with low thermal conductivity) that has higher heat retention or cold insulation than the plastic material that constitutes 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. This enhances the heat retention or cold retention of the composite container 10A. Such materials include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like.
The inner label member 60a preferably further comprises hollow particles. The average particle size of the hollow particles is preferably 1-200 μm, more preferably 5-80 μm. The hollow particles may be organic hollow particles made of resin or the like, or inorganic hollow particles made of glass or the like. Hollow particles are preferred. Examples of the resin that constitutes the organic hollow particles include those similar to those described above. In addition, the 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, which is a direct blow molded product, is attached to the outer surface of the inner label member 60a without being glued, and is in close contact with the preform 10a so as not to move or rotate, or It is tightly attached to the extent that it does not fall under its own weight.
The plastic member 40a surrounds the preform 10a over its entire circumferential direction and has a substantially circular horizontal cross section.

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 bottom portion 30a.

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

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

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

As shown in FIG. 13(a), the plastic member 40a may have a bottomed cylindrical shape as a whole, and may have a cylindrical trunk portion 41 and a bottom portion 42 connected to the trunk portion 41. . In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, various functions and characteristics can be imparted to the bottom portion 30 in addition to the body portion 20 of the composite container 10A. As shown in FIG. 13(b), the plastic member 40a may have a bottomed cylindrical plastic member 40a whose bottom is cut to form a circular tubular shape (bottomless cylindrical shape) as a whole.

Next, a blow molding method (manufacturing method of the composite container 10A) according to this embodiment will be described with reference to FIGS. 14(a) to 14(f).

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

Next, an inner label member 60a is provided outside the preform 10a, and a plastic member 40a is provided outside the inner label member 60a. As a result, a composite preform 70 having the preform 10a, the inner label member 60a in close contact with the outer side of the preform 10a, and the plastic member 40a in close contact with the outer side of the inner label member 60a is produced (FIG. 14). (b)). In this case, the inner label member 60 a has a cylindrical shape with a bottom as a whole, and has a cylindrical trunk portion 61 and a bottom portion 62 connected to the trunk portion 61 .

In this case, the inner label member 60a and the plastic member 40a, which have inner diameters that are the same as or slightly smaller than the outer diameter of the preform 10a, may be pressed against the preform 10a to adhere to the outer surface of the preform 10a. good.

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

In this way, the plastic member 40a is brought into close contact with the outer sides of the preform 10a and the inner label member 60a in advance to produce the composite preform 70, thereby producing a series of steps for producing the composite preform 70 (see FIG. 14 ( a) to (b)) and a series of steps for manufacturing the composite container 10A by blow molding (FIGS. 14(d) to (f)) can be performed at separate locations (factories, etc.).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 14(c)).

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow mold 50 . The composite container 10A is molded using this blow molding die 50, and the container body 10 and the inner label member provided on the outer surface of the container body 10 are formed in substantially the same manner as in the first embodiment described above. 60 and the plastic member 40 provided outside the inner label member 60 is obtained (see FIGS. 14(d)-(f)).

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

As described above, according to the present embodiment, the preform 10a of the composite preform 70, the inner label member 60a and the plastic material are molded by blow-molding the composite preform 70 in the blow molding mold 50. The composite container 10A including the container main body 10, the inner label member 60, and the plastic member 40 is produced by expanding the product member 40a as one. 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 applying a label by a labeler after the composite container 10A is filled with the content liquid and sealed. Thereby, the manufacturing cost for manufacturing the final product can be suppressed.
In addition, it is possible to prevent a decrease in yield when manufacturing the final product due to defects in 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 constructed from separate members. Therefore, by appropriately selecting the type and shape of the plastic member 40, various functions and characteristics can be imparted to the composite container 10A.

In addition, according to the present embodiment, when manufacturing the composite container 10A, a general blow molding apparatus can be used as it is, so there is a need to prepare new molding equipment for manufacturing the composite container 10A. do not have.

Modification Next, a modification of the present invention will be described with reference to FIGS. 15 to 17. FIG.

The modification shown in FIGS. 15 to 17 uses a cylindrical inner label member 60a and plastic member 40a instead of having a trunk and a bottom as the inner label member 60a and plastic member 40a. .

In the composite container 10A shown in FIG. 15, the inner label member 60 and the plastic member 40 extend from the shoulder 12 of the container body 10 to the lower portion of the body 20, but do not reach the bottom 30. As shown in FIG. In the composite preform 70 shown in FIG. 16, the inner label member 60a and the plastic member 40a are closely attached 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.

15 to 17 are substantially the same as the embodiment shown in FIGS. 10 to 14. FIG. In the modification shown in FIGS. 15 to 17, the same parts as those in the embodiment shown in FIGS. 10 to 14 are denoted 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 embodiment shown in FIGS. 10 to 14, so detailed description thereof will be omitted.

Claims (8)

In a blow molding method for molding a composite container,
providing a preform made of plastic material;
A step of providing an injection-molded plastic member on the outside of the preform;
heating the preform and the plastic member and inserting them into a blow mold;
By subjecting the preform and the plastic member to blow molding in the blow molding die, the preform and the plastic member are expanded together, and the container body corresponding to the preform and the forming a plastic member provided in close contact with the outside of the container body,
The preform is made of polyethylene terephthalate and is colorless and transparent,
The plastic member after blow molding is not welded to the container body, and is provided so as to be peelable and removable from the container body ,
In the step of providing a plastic member of an injection-molded product outside the preform, the plastic member is pressed into the preform to bring the plastic member into close contact with the outer surface of the preform. A method of blow molding characterized by: 2. The method according to claim 1, wherein said preform has a mouth, a body and a bottom, and said plastic member is provided so as to cover said body and said bottom of said preform. The blow molding method described. The preform has a mouth portion, a body portion, and a bottom portion, and the plastic member is provided so as to cover a part of the body portion and the bottom portion of the preform, The blow molding method according to claim 1. The blow molding method according to any one of claims 1 to 3, wherein the plastic member has gas barrier properties or light barrier properties. The blow molding method according to any one of claims 1 to 4, wherein the plastic member is provided with a design or print. The blow molding method according to any one of claims 1 to 5, wherein the plastic member is made of a material having a higher heat insulating property or cold insulating property than the plastic material forming the preform. The blow molding method according to any one of claims 1 to 6, wherein the plastic member is made of a material that is less slippery than the plastic material forming the preform. further comprising providing an inner label member so as to surround the outside of the preform;
The blow molding method according to any one of claims 1 to 7, wherein the plastic member is provided outside the inner label member.

Images