JP6850444B2 - Manufacturing method of plastic parts and manufacturing method of composite container - Google Patents

Description

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

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 biaxially stretching blow molding.

By the way, in the conventional biaxial stretching 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 stretching 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 a point, and provides a method for manufacturing a plastic member and a method for manufacturing a composite container, which can impart various functions and characteristics to a container. With the goal.

The method for manufacturing a plastic member of the present invention is
A plastic member for making a composite container having a 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 manufacturing method of
(1) A step of heating and melting a resin material containing a crosslinkable resin, and
(2) A process of extruding a heat-melted resin material to obtain an extruded product, and
(3) The process of expanding the diameter of the extruded product and
(4) The step of irradiating the extruded product with the expanded diameter with active light to crosslink the crosslinkable resin is included.
The plastic member is a heat-shrinkable tube.

In aspects of the present invention, the resin material preferably comprises a cross-linking agent and / or a cross-linking aid.

In the aspect of the present invention, it is preferable that the active light beam is an electron beam.

In the embodiment of the present invention, the dose of the electron beam is preferably 1 to 1000 kGy.

The method for producing a composite container of the present invention is
The process of preparing a preform made of plastic material and
A step of providing a plastic member obtained by the above method on the outside of the preform, and
A step of heating the preform and the plastic member and inserting them into a blow molding die.
It is characterized by comprising 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.

According to the present invention, by appropriately selecting the type and shape of the plastic member, it is possible to obtain a plastic member capable of imparting various functions and characteristics to the composite container.
Further, since the plastic member obtained by the method of the present invention is a heat-shrinkable tube, less air enters between the container body and the plastic member after blow molding, and the adhesion can be improved.
Furthermore, since the plastic member obtained by the method of the present invention contains a crosslinkable resin crosslinked by active light rays, scratch resistance and heat resistance of the composite container can be improved.
Further, since the slip agent used during transportation on the production line is an alkaline agent, ordinary PET bottles and the like may be decomposed, resulting in a change in color or damage. Since the plastic member included in the composite container obtained by the method according to the present invention has high chemical resistance, such a problem can be solved.

FIG. 1 is a partial vertical sectional view showing a composite container according to the first embodiment of the present invention. FIG. 2 is a horizontal sectional view (FIG. II-II sectional view 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. FIG. 4 is a perspective view showing a plastic member. 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. FIG. 7 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 8 is a horizontal sectional view (XIII-XIII line sectional view of FIG. 7) showing a composite container according to a second embodiment of the present invention. FIG. 9 is a vertical sectional view showing a composite preform according to a second embodiment of the present invention. FIG. 10 is a perspective view showing an inner label member and a plastic member. 11 (a) to 11 (f) are schematic views showing a blow molding method according to a second embodiment of the present invention. 12 (a) to 12 (g) are schematic views showing a blow molding method according to a modified example of 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 6 are diagrams showing the first embodiment of the present invention.

First, the outline of the composite container produced by the blow molding method according to the present embodiment will be described with reference to FIGS. 1 and 2. In addition, in this specification, "upper" and "lower" mean the upper part and the lower part in the state (FIG. 1) in which the composite container 10A is upright, 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 of the composite preform 70 and the plastic member 40a 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, and a body portion 20 provided below the shoulder portion 12. It is provided with a bottom portion 30 provided below the body portion 20.

On the other hand, the plastic member 40 is in close contact with the outer surface of the container body 10 in a thinly extended state, and is attached to the container body 10 in a state where it does not easily move or rotate, or does not fall by its own weight. It is in close contact with the degree.

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, the body portion 20 may have irregularities such as a panel or a groove.

On the other hand, the bottom portion 30 has a recess 31 located at the center and a ground contact 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, for example, 10 g to 20 g when the content of the container body 10 is 500 ml. 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 stretching blow molding a preform 10a (described later) manufactured by injection molding a synthetic resin material. As the material of the preform 10a, that is, the container body 10, a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), 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 a color such as red, blue, yellow, green, brown, black, or 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 be formed as a multi-layer molded bottle having two or more layers. That is, by injection molding, for example, the intermediate layer has gas barrier properties such as MXD-6 (nylon), MXD-6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). In addition, a preform 10a composed of three or more layers as a resin (intermediate layer) having a light-shielding property may be injection-molded and then blow-molded to form a multi-layer bottle having a gas barrier property and a light-shielding property. 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. By doing so, the container body 10 may be manufactured. Since such a container body 10 has a foam cell built-in, it is possible to improve the light-shielding property of the entire container body 10.

Such a container body 10 may consist of, for example, a bottle having a full filling capacity 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, is brought into close contact with the outside of the preform 10a, and then biaxially stretched and blow-molded together with the preform 10a. Be done. The plastic member 40a is a heat-shrinkable tube containing a crosslinkable resin crosslinked by an active light beam and having an action of shrinking with respect to the preform 10a, which is produced by undergoing a step of imparting heat shrinkage. Is. Since the plastic member 40a is a heat-shrinkable tube, it is possible to prevent the preform 10a from being displaced. In addition, it is possible to improve the followability to blow molding. Further, since the plastic member 40a contains the crosslinkable resin crosslinked by the active light beam, the transparency of the plastic member and the scratch resistance and heat resistance of the composite container can be improved. The plastic member 40a itself may have shrinkage or elasticity and may be shrinkable without applying an external action.

The plastic member 40a is provided on the outside of the preform 10a, is heated integrally with the preform 10a, and is biaxially stretched and blow-molded. As a result, the plastic member 40 is obtained.

The plastic member 40 is attached to the outer surface of the container body 10 without being adhered to the container body 10 so as not to move or rotate, or to the extent that it does not fall due to 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. 2, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

In this case, the plastic member 40 is provided so as to cover the shoulder portion 12 and the body portion 20 of the container body 10, excluding the mouth portion 11 and the neck portion 13. As a result, desired functions and characteristics can be imparted to the shoulder portion 12 and the body portion 20 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, and body portion 20 of the container body 10 except for the mouth portion 11 and the bottom portion 30. Alternatively, the plastic member 40 may be provided so as to cover a part of the bottom portion 30 in addition to the plastic member 40. 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 neck portion 13 and the outer surface of the body portion 20, respectively.

Further, since the plastic member 40 is not welded or adhered to the container body 10, it can be separated (peeled) from the container body 10 and removed.

Examples of the method for separating (peeling) the plastic member 40 from the container body 10 include hot water separation. Specifically, since the plastic member 40 (40a) has heat shrinkage, the composite container 10A including the plastic member 40 and the container body 10 is made of a small container body and a small plastic. By crushing into a plurality of flakes including the member and immersing the plurality of flakes in hot water, each flake can be separated into a small container body and a small plastic member. The separation of the small piece-shaped container body and the small piece-shaped plastic member occurs due to the heat shrinkage of the plastic member 40 and the difference in their specific gravities. Further, the separated small piece-shaped container body and the small piece-shaped plastic member are collected separately.

As another example of the separation method, for example, the plastic member 40 is cut with a knife or the like, or the plastic member 40 is provided with a cutting line in advance and the plastic member 40 is peeled off along the cutting line. be able to. Since the plastic member 40 can be separated and removed from the container body 10 by the method as described above, the colorless and transparent container body 10 can be recycled as in the conventional case.

In one embodiment, labels such as shrink labels and stretch labels can be adhered to the plastic member 40 via an adhesive (not shown). Since the label is adhered to the plastic member in this way, the plastic member can be separated (peeled) from the container body at the same time as the label is removed. The adhesive used in this case is not particularly limited as long as the plastic member is attached to the label and can be separated from the container body, but is not particularly limited, but is limited to cyanoacrylate adhesive, silicone adhesive, and epoxy. Examples include system adhesives.

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 bottomless 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 attached to the outer surface of the preform 10a without being adhered to the preform 10a so that it does not move or rotate, or is in close contact with the preform 10a so that it does not fall under 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 body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10.

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 including the neck portion 13. Alternatively, the plastic member 40a may cover the entire body portion 20a and a part region of the bottom portion 30a. 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.

The plastic member 40a (40) is a resin material containing a crosslinkable resin that is crosslinked by irradiating with active light rays. Examples of the crosslinkable resin include resins such as PE, PP, polystyrene, polyvinylidene fluoride, polymethylacrylate, polyvinyl chloride, polybutadiene, natural rubber, vinyl alcohol, polyamide resin, and ethylene vinyl acetate copolymer (EVA). Can include. Among these, PE, PP and the like are preferable.
The content of the crosslinkable resin in the plastic member 40a is preferably 95 to 100% by mass, more preferably 98 to 100% by mass.

In addition to crosslinkable resins, resin materials include, for example, polylactic acid, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, polyvinylidene chloride, and poly, as long as their properties are not impaired. Vinyl acetate, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluororesin, polymethylmethacrylate, polyacrylic acid, polyacrylonitrile, polyacrylamide, polybutene-1, nylon 6, nylon 6,6, nylon MXD6, aromatic Polyamide, polycarbonate, ethylene polyterephthalate, butylene polyterephthalate, ethylene polynaphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyetherketone, polyetheretherketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene It may contain sulfide, polyethersulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin and the like.
Further, the resin material may contain a copolymer in which two or more monomer units constituting the above resin are polymerized. Further, the resin material may contain two or more of the above-mentioned resins. Further, they may be a blended material, a multi-layer structure, or a partial multi-layer structure.

The resin material preferably contains a cross-linking agent, and examples of the cross-linking agent include hexamethylenediamine carbamate, dioltotrilguanidine, dicumyl peroxide, and 1,3-phenylene bisoxazoline.

The content of the cross-linking agent is preferably 0.1 to 5 parts by mass, more preferably 0.1 to 2 parts by mass, when the total amount of the resin material is 100 parts by mass.

The resin material preferably contains a cross-linking aid, and examples of the cross-linking agent include triallyl isocyanurate, triallyl cyanurate, diallyl fumarate, trimethylolpropane trimethacrylate, and trimethylolpropane triacrylate. Examples thereof include ethylene glycol dimethacrylate.

The content of the cross-linking aid is preferably 0.1 to 5 parts by mass, more preferably 0.1 to 2 parts by mass, when the total amount of the resin material is 100 parts by mass.

Further, the resin material may contain various additives in addition to the resin material as the main component, as long as the object of the present invention is not impaired. Additives include, for example, plasticizers, UV stabilizers, color inhibitors, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, thread friction reducing agents, slip agents, mold release agents, anti-flammable agents. Examples thereof include an oxidizing agent, an ion exchanger, and a coloring pigment.

Further, the plastic member 40a (40) may be made of a resin material containing the same material as the preform 10a (container body 10). In this case, for example, the plastic member 40a (40) can be arranged mainly on the portion of the composite container 10A whose 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 of the container body 10 to increase the strength of this portion. Examples of such a material include polyolefin-based resins such as PE and PP, and polystyrene-based resins such as PS.

Further, the plastic member 40a may be made of a resin material containing 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, in the container main body 10, a plastic member 40 may be provided in the entire area of the shoulder portion 12, the neck portion 13 and the body portion 20 and a part of the bottom portion 30 to enhance the gas barrier property of this portion. As such a material, PE, PP, MXD-6, PGA, EVOH, PEN, or an oxygen absorber such as a fatty acid salt may be mixed with these materials.

Further, the plastic member 40a may be made of a resin material containing a material having a light ray barrier property such as ultraviolet rays. In this case, it is possible to enhance the light barrier property of the composite container 10A and prevent the content liquid from being deteriorated by ultraviolet rays or the like without using a multilayer preform or a preform containing a blend material as the preform 10a. For example, in the container main body 10, a plastic member 40a may be provided on the entire area of the shoulder portion 12, the neck portion 13, the body portion 20, and a part of the bottom portion to enhance the ultraviolet barrier property of this portion. As such a material, a resin material containing two or more kinds of the above-mentioned resins, 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, even if the plastic member 40a is made of a resin material containing a material having higher heat retention or cold retention (material having low thermal conductivity) than the plastic material constituting the container body 10 (preform 10a). good. 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 retention or cold retention of the composite container 10A is enhanced. For example, the 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 that the composite container 10A becomes difficult to hold due to being too hot or too cold. As such a material, foamed polyurethane, polystyrene, PE, PP, phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. 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 composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like, but 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 a 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 Corporation), SX878 , SX866 (manufactured by JSR Corporation) 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. More preferably, it is ~ 20 parts by mass. When the plastic member 40a is composed of multiple layers, it is preferably 0.01 to 50 parts by mass with respect to 100 parts by mass of the resin material contained in the layer of the plastic member 40a containing hollow particles. More preferably, it is ~ 20 parts by mass.

Further, the plastic member 40a may be made of a material that is less slippery than the plastic material constituting the container body 10 (preform 10a). 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 the body 20 easier to hold.

Further, the plastic member 40a may be designed or printed. In this case, it is possible to display an image or 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 a part of the body 20 of the container body 10, and an image or characters may be displayed on the body 20. Printing can be performed by, for example, 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 (40), UV irradiation is performed on the plastic member 40a (40), and the ink is cured to form a print layer. This printing may be applied to the plastic member 40a before being attached to the preform 10a, or may be applied with the plastic member 40a 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.

The plastic member 40a (40) may be colored in a color such as red, blue, yellow, green, brown, black, or white, and may be transparent or opaque.

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

As shown in FIGS. 3 and 4, the plastic member 40a preferably has a bottomless cylindrical shape as a whole. By providing such a plastic member 40, various functions and characteristics can be imparted to the body portion 20 of the composite container 10A.

In the composite container 10A shown in FIG. 1, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20. Further, in the composite preform 70 shown in FIG. 3, 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 of the body portion 20a. It covers the area excluding the portion 13a corresponding to the portion 13a and the portion corresponding to the lower portion of the body portion 20a. The present invention is not limited to this, and the plastic member 40 may cover a part of the bottom portion of the container body 10. Similarly, the plastic member 40a is the bottom portion 30a of the preform 10a. It may cover a part of. The same applies to the following aspects.

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

The plastic member 40a is
(1) A step of heating and melting a resin material containing a crosslinkable resin, and
(2) A step of extruding the heat-melted resin material to obtain an extruded product, and
(3) The step of expanding the diameter of the extruded product and
(4) The extruded product having an enlarged diameter can be produced by a method including a step of irradiating the extruded product with active light rays to crosslink the crosslinkable resin.
Hereinafter, each step will be described in detail.

(1): Heating and melting step In the heating and melting step, it is preferable to heat the resin material to a temperature of the melting point (Tm) to Tm + 70 ° C., and more preferably to a temperature of Tm to Tm + 40 ° C.

(2): Extrusion molding step An extrusion molded product can be obtained by extruding a heat-melted resin material into, for example, a tube shape. The multi-layered plastic member 40a can be obtained by co-extruding two or more kinds of resin materials.

(3): Diameter expansion step The diameter of the extruded product can be expanded by a conventionally known method. For example
First, one end of the tubular extruded product is closed by welding or gluing.
Next, the extruded product having one end closed is placed in a mold whose inner diameter is larger than the outer diameter of the extruded product.
Next, a blow device is arranged (mounted) on the other end of the extruded product. At this time, it is preferable that the blow device is in close contact with the extruded product so that air does not leak between them.
Subsequently, the extruded product, the mold, and the blow device are sent into the heating furnace in this arrangement and heated inside the heating furnace. The heating temperature at this time is preferably 70 to 150 ° C, more preferably 80 to 125 ° C. Further, as the heating furnace, a hot air circulation type heating furnace can be used in order to make the inside thereof have a uniform temperature. Further, the extruded product, the mold and the blow device may be heated by passing through the heated liquid.
Next, the extruded product, the mold, and the blow device are taken out from the heating furnace, and air is blown into the extruded product from the blow device to pressure-stretch the inner surface of the extruded product. As a result, the extruded product expands and the diameter is expanded along the inner surface shape of the mold. The diameter of the extruded product may be increased while heating in the heating furnace. In one embodiment, after the diameter is expanded, the extruded product may be cooled by impregnating it in cold water with air blown from the blower.

(4): Crosslinking Step In the present invention, the crosslinkable resin contained in the resin material can be crosslinked by irradiating the extruded product having an enlarged diameter with active light.
In the present specification, the active ray means a radiation that chemically acts on a resin material to promote a cross-linking reaction, and specifically, a visible ray, an ultraviolet ray, an X-ray, an electron beam, an α ray, and the like. It means β rays, γ rays, etc. Among these, electron beams are preferable because they are easy to control, and γ rays are preferable because they have excellent penetrating power.
Here, the doses of the electron beam and the gamma ray are preferably 1 to 1000 kGy, and more preferably 20 to 300 kGy. The acceleration voltage of the electron beam is preferably 50 to 1000 kV, more preferably 70 to 400 kV.

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).

Next, the plastic member 40a is loosely inserted to the outside of the preform 10a (see FIG. 5B). In this case, the plastic member 40a has a bottomless cylindrical shape as a whole, and has a cylindrical body portion 41. The plastic member 40a covers the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10.

Next, the preform 10a and the plastic member 40a are heated by the heating device 51 (see FIG. 5C). Thereby, the composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a can be produced. At this time, the preform 10a and the plastic member 40a are uniformly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90 ° C to 130 ° C.

When the plastic member 40a is heated in this way, the plastic member 40a is thermally shrunk and comes into close contact with the outside of the preform 10a (see FIG. 5C).

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 that are separated 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 used. A sealed blow molding die 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, the composite container 10A including the container body 10 and the plastic member 40 provided on the outer surface of the container body 10 is obtained.

Next, as shown in FIG. 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 the manufacturing method of the composite container 10A

Next, other modified examples of the blow molding method (method for manufacturing the composite container 10A) according to the present embodiment will be described with reference to FIGS. 6A to 6G. The modified example shown in FIGS. 6 (a) to 6 (g) heats the preform 10a and the plastic member 40a in two stages, and the other configurations are the forms shown in FIGS. 5 (a) to 5 (f). Is almost the same as. In FIGS. 6A to 6G, 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, the plastic member 40a is loosely inserted to the outside of the preform 10a (see FIG. 6B). In this case, the plastic member 40a has a bottomless cylindrical shape as a whole, and has a cylindrical body portion 41. The plastic member 40 is 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.

Next, the preform 10a and the plastic member 40a are heated by the first heating device 55 (see FIG. 6C). At this time, the heating temperature of the preform 10a and the plastic member 40a may be, for example, 50 ° C to 100 ° C.

When the plastic member 40a is heated, the plastic member 40a heat-shrinks and comes into close contact with the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a can be obtained (see FIG. 6C).

In this way, a series of production of the composite preform 70 by heat-adhering the plastic member 40a to the outside of the preform 10a in advance using the first heating device 55 to prepare the composite preform 70. The steps (FIGS. 6 (a) to 6 (c)) and the series of steps (FIGS. 6 (d) to (g)) for producing the composite container 10A by blow molding are carried out at different places (factories, etc.). Becomes possible.

Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 6D). 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 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. 6E). In this case, heating for heat-shrinking the plastic member 40a and heating for blow-molding the preform 10a can be performed in the same process.

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. 5 (a) to 5 (f) described above. A composite container 10A provided with the shrinkable tube 40 is obtained (see FIGS. 6 (e) to 6 (g)).

As described above, according to the present embodiment, the composite preform 70a and the plastic member 40a of the composite preform 70 are formed by performing blow molding on the composite preform 70 in the blow molding mold 50. It is expanded as a unit to produce 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. Absent. Further, since the plastic member 40a is provided on the outside of the preform 10a, it is not necessary to prepare a new molding facility for molding the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 7 to 12 are views showing a second embodiment of the present invention. In FIGS. 7 to 12, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

First, the outline of the composite container produced by the blow molding method according to the present embodiment will be described with reference to FIGS. 7 and 8.

As will be described later, the composite container 10A shown in FIGS. 7 and 8 is formed into a composite preform 70 (see FIG. 9) 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 the container body 10 made of a plastic material located inside, the inner label member 60 provided in close contact with the outside of the container body 10, and the outer side of the inner label member 60. The plastic member 40 is provided.

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, and a body portion 20 provided below the shoulder portion 12. It is provided with a bottom portion 30 provided below the body 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 is a heat-shrinkable tube, which is in close contact with the outer surface of the container body 10 and the outer surface of the inner label member 60 in a thinly extended state, and can be easily moved or rotated with respect to the container body 10. It is so close that it does not fall, or it is so close that it does not fall under its own weight.

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. The plastic member 40 may be translucent or transparent as a whole, or may have an opaque portion and a translucent or transparent portion (for example, a window portion). In this embodiment, a case where the entire plastic member 40 is transparent will be described as an example.

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 stretching 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, or to such an extent that it does not fall due to its own weight. .. The inner label member 60 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. As shown in FIG. 7, 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 and the body portion 20 of the container body 10, excluding the mouth portion 11, the neck portion 13, and the bottom portion 30. As a result, desired characters, images, and the like can be added to the shoulder portion 12 and the body portion 20 of the container body 10, and the composite container 10A can be decorated or display 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 a part of the neck portion 13, the shoulder portion 12, the body portion 20 and the bottom portion 30 of the container body 10 except for the mouth portion 11. Alternatively, the inner label member 60 may be provided so as to cover the entire area of the neck portion 13, the entire shoulder portion 12, the entire body portion 20, and a part of the bottom portion 30. 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, the inner label member 60 is preferably 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 stretching 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 to the container body 10 so as not to move or rotate, or to be adhered to the container body 10 so as not to drop by its own weight. There is. 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. 8, 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, the configuration of the composite preform according to the present embodiment will be described with reference to FIG.

As shown in FIG. 9, the composite preform 70 includes a preform 10a made of a plastic material, a bottomless cylindrical inner label member 60a provided in close contact with the outer side of the preform 10a, and an inner label member 60a. It is provided with a bottomless cylindrical plastic member 40a provided in close contact with the outside.

The inner label member 60a is in close contact with the outer surface of the preform 10a so that it does not easily move or rotate with respect to the preform 10a, or is in close contact with the preform 10a to the extent that it does not fall due to its own weight. 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 an image or characters on the composite container 10A without separately attaching a label or the like to the container body 10 after blow molding. For example, the inner label member 60a may be provided on all or part of the 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 made of a polyester resin, a polyamide resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, a fluorine resin, a material blended thereto, or the like is used. Can be done. 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, 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. As such a material, PE, PP, MXD-6, EVOH, PEN, 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 barrier property such as ultraviolet rays. In this case, it is possible to enhance the light barrier property of the composite container 10A and prevent the content liquid from being deteriorated by ultraviolet rays or the like without using a multilayer preform or a preform containing a blend material as the preform 10a. As such a material, a 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 retention or cold retention of the composite container 10A is enhanced. As such a material, foamed polyurethane, polystyrene, PE, PP, phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin and the like can be considered. The inner label member 60a preferably further 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 composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like, but are organic because of their excellent dispersibility. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include the same resins as those described above.
Moreover, 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, and 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, or to the extent that it does not fall due to its own weight. Has been done. 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 body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10.

The inner label member 60a and the 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 including the neck portion 13. Further, the inner label member 60a and the plastic member 40a are not limited to one each, and a plurality of inner label members 60a 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.

The plastic member 40a has an action of contracting with respect to the preform 10a, and contracts (for example, heat shrinks) with respect to the preform 10a when 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 FIG. 10, it is preferable that the plastic member 40a (inner label member 60a) has a bottomless cylindrical shape as a whole and has a cylindrical body portion 41 (body portion 61).
In this case, various functions and characteristics can be imparted to the composite container 10A.

Next, the blow molding method (manufacturing method of the composite container 10A) according to the present embodiment will be described with reference to FIGS. 11A to 11F.

First, a preform 10a made of a plastic material is prepared (see FIG. 11A).

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 (see FIG. 11B). The inner label member 60a and the plastic member 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. At least a part of the plastic member 40a may be translucent or transparent.

In this case, 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.

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

When the plastic member 40a is heated in this way, the plastic member 40a is thermally shrunk and comes into close contact with the outside of the preform 10a (see FIG. 11C).

Subsequently, the preform 10a, the inner label member 60a, and the plastic member 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 11D).

The preform 10a, the inner label member 60a, and the plastic member 40a are molded by using the blow molding die 50, and together with the container body 10 in substantially the same manner as in the cases of FIGS. 11A to 11F described above. , A composite container 10A including an inner label member 60a provided on the outer surface of the container body 10 and a plastic member 40 provided on the outer side of the inner label member 60a can be obtained (FIGS. 11 (d) to 11 (f)). reference).

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. 12 (a) to 12 (g). The modified example shown in FIGS. 12 (a) to 12 (g) is for heating the preform 10a and the plastic member 40a in two stages, and the other configurations are the forms shown in FIGS. 11 (a) to 11 (f). Is almost the same as. In FIGS. 12 (a) to 12 (g), the same parts as those in FIGS. 11 (a) to 11 (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. 12A).

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 (see FIG. 12B). 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. At least a part of the plastic member 40a may be translucent or transparent.

In this case, 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.

Next, the preform 10a, the inner label member 60a, and the plastic member 40a are heated by the first heating device 55 (see FIG. 12C). At this time, the heating temperature of the preform 10a, the inner label member 60a, and the plastic member 40a may be, for example, 50 ° C to 100 ° C.

When the plastic member 40a is heated, the plastic member 40a heat-shrinks and comes into close contact with the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a, the inner label member 60a adhered to the outer side of the preform 10a, and the plastic member 40a adhered to the outer side of the inner label member 60a can be obtained (FIG. 12). (C).

In this way, the composite preform 70 is produced by heat-adhering the plastic member 40a to the outside of the preform 10a and the inner label member 60a in advance using the first heating device 55 to prepare the composite preform 70. A series of steps (FIGS. 12 (a) to (c)) for producing the composite container 10A and a series of steps (FIGS. 12 (d) to (g)) for producing the composite container 10A by blow molding are performed at different locations (factory, etc.). ) Will be possible.

Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 12 (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 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. 12E).

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. 11A to 11F described above. A composite container 10A including the inner label member 60 and the plastic member 40 provided on the outer side of the inner label member 60 can be obtained (see FIGS. 12 (e) to 12 (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, the inner label member 60a, and the composite preform 70 of the composite preform 70 are formed. The plastic member 40a is integrally expanded to produce 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 labeling with 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 composed 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. Absent.

Claims (4)

For producing 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 method of manufacturing plastic parts.
(1) A step of heating and melting a resin material containing a crosslinkable resin, and
(2) A step of extruding the heat-melted resin material to obtain an extruded product, and
(3) The step of expanding the diameter of the extruded product and
(4) The step of irradiating the extruded product with the expanded diameter with active light to crosslink the crosslinkable resin is included.
The plastic member is a heat shrink tubing, which is printed and
The resin material comprises a cross-linking agent and a cross-linking aid.
The content of the cross-linking agent is 0.1 to 5 parts by mass when the total amount of the resin material is 100 parts by mass.
The content of the crosslinking aid, the total amount of the resin material is taken as 100 parts by weight, and wherein 0.1 to 5 parts by mass der Rukoto method. The method according to claim 1, wherein the active light beam is an electron beam. The method according to claim 2 , wherein the dose of the electron beam is 1 to 1000 kGy. In the method of manufacturing a composite container
The process of preparing a preform made of plastic material and
A step of providing a plastic member obtained by the method of any one of claims 1 to 3 on the outside of the preform, and a step of providing the plastic member.
A step of heating the preform and the plastic member and inserting them into a blow molding die.
A method comprising 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.

Images