JP7102091B2 - Composite preforms, composite containers, plastic parts and their manufacturing methods - Google Patents

Description

The present invention relates to composite preforms, composite containers, plastic members and methods for manufacturing the same.

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 composite preform, a composite container, a plastic member, and a method for manufacturing the same, which can impart various functions and characteristics to the container. The purpose is to do.

The composite preform of the present invention
Preform made of plastic material and
It is equipped with a plastic member of a direct blow molded product that is provided so as to surround the outside of the preform.
The plastic member comprises a crosslinked resin material.

According to the aspect of the present invention, it is preferable that the crosslinked resin material is a crosslinked resin material by irradiation with active light or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

According to aspects of the invention, the plastic member preferably comprises a cross-linking agent and / or a cross-linking aid.

The composite container of the present invention
The container body made of plastic material and
It is equipped with a plastic member of a direct blow molded product, which is provided in close contact with the outside of the container body.
The container body and the plastic member are characterized by containing a crosslinked resin material.

According to the aspect of the present invention, it is preferable that the crosslinked resin material is a crosslinked resin material by irradiation with active light or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

According to aspects of the invention, the plastic member preferably comprises a cross-linking agent and / or a cross-linking aid.

The plastic member of the present invention
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. And
The plastic member is a direct blow molded article having a tubular body that covers at least the body of the preform.
The plastic member comprises a crosslinked resin material.

According to the aspect of the present invention, it is preferable that the crosslinked resin material is a crosslinked resin material by irradiation with active light or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si).

According to aspects of the invention, it preferably comprises a cross-linking agent and / or a cross-linking aid.

The method for manufacturing a plastic member of the present invention is
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.
The process of heating and melting the mixture containing the crosslinkable resin material, and
The step of extruding the heated and melted mixture to form a tubular parison, and
In the mold, air is blown into the tubular parison, and the tubular parison is blow-molded according to the shape of the mold to obtain a direct blow-molded product.
A step of cross-linking the cross-linkable resin material contained in the direct blow molded product, and
Characterized by containing

According to the aspect of the present invention, it is preferable that the step of cross-linking the crosslinkable resin material contained in the molded product is performed by an active light irradiation treatment or a water cross-linking treatment on the direct blow molded product.

According to the present invention, the composite preform and the plastic member are integrally expanded by performing blow molding on the composite preform in the blow molding mold. Therefore, the preform (container body) and the plastic member can be composed of separate members, and various functions and characteristics can be imparted to the composite container by appropriately selecting the type and shape of the plastic member. can. Further, since the plastic member is a direct blow molded product, the design of the plastic member can be finely controlled by changing the mold, and the adhesion can be further improved. Further, since the plastic member contains the crosslinked resin material, the heat resistance, wear resistance, solvent resistance and heat shrinkage of the plastic member can be improved.

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 partial vertical sectional view showing a composite container according to the first embodiment of the present invention. FIG. 3 is a horizontal cross-sectional view showing a composite container according to the first embodiment of the present invention (cross-sectional views taken along lines III-III of FIGS. 1 and 2). FIG. 4 is a vertical sectional view showing a composite preform according to the first embodiment of the present invention. FIG. 5 is a vertical cross-sectional view showing a composite preform according to the first embodiment of the present invention. 6 (a) and 6 (b) are perspective views showing various plastic members. 7 (a) to 7 (d) are front views showing the arrangement of various openings of the plastic member. 8 (a) to 8 (d) are front views showing the arrangement of various openings of the plastic member. 9 (a) to 9 (i) are views showing various shapes of various openings. 10 (a) to 10 (d) are schematic views showing an embodiment of a method for manufacturing a plastic member. 11 (a) to 11 (f) are schematic views showing a blow molding method according to the first embodiment of the present invention. FIG. 12 is a partial vertical sectional view showing a modified example of the composite container according to the first embodiment of the present invention. FIG. 13 is a partial vertical sectional view showing a modified example of the composite container according to the first embodiment of the present invention. FIG. 14 is a vertical cross-sectional view showing a modified example of the composite preform according to the first embodiment of the present invention. FIG. 15 is a vertical cross-sectional view showing a modified example of the composite preform according to the first embodiment of the present invention. 16 (a) to 16 (f) are schematic views showing a modified example of the blow molding method according to the first embodiment of the present invention. FIG. 17 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 18 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 19 is a horizontal sectional view (XIX-XIX line sectional view of FIGS. 17 and 18) showing a composite container according to a second embodiment of the present invention. FIG. 20 is a vertical cross-sectional view showing a composite preform according to a second embodiment of the present invention. FIG. 21 is a vertical cross-sectional view showing a composite preform according to a second embodiment of the present invention. 22 (a) and 22 (b) are perspective views showing various inner label members and various plastic members. 23 (a) to 23 (d) are front views showing the arrangement of various openings of the inner label member and the plastic member. 24 (a) to 24 (d) are front views showing the arrangement of various openings of the inner label member and the plastic member. 25 (a) to 25 (f) are schematic views showing a blow molding method according to a second embodiment of the present invention. FIG. 26 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention. FIG. 27 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention. FIG. 28 is a vertical cross-sectional view showing a modified example of the composite preform according to the second embodiment of the present invention. FIG. 29 is a vertical cross-sectional view showing a modified example of the composite preform according to the second embodiment of the present invention. 30 (a) to 30 (f) are schematic views showing a modified example of the blow molding method according to the second embodiment of the present invention.

First Embodiment Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. 1 to 11 are diagrams showing the first embodiment of the present invention.

First, with reference to FIGS. 1 to 3, the outline of the composite container produced by the blow molding method according to the present embodiment will be described. 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.

The composite container 10A shown in FIGS. 1 and 2 uses a blow molding die 50 with respect to the composite preform 70 (see FIGS. 4 and 5) including the preform 10a and the plastic member 40a, as described later. It is obtained by integrally expanding the preform 10a of the composite preform 70 and the plastic member 40a by performing biaxial stretching blow molding.

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

Of these, the container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a body portion 20 provided below the shoulder portion 12, and a body. It is provided with a bottom portion 30 provided below the portion 20.

On the other hand, the plastic member 40 is 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.

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 panels or grooves.

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).

Further, 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.

Further, as shown in FIG. 2, the plastic member 40 may be provided with an opening 44 (peeling opening). A plurality of the openings 44 are provided, and are formed in a perforated shape along the longitudinal direction of the plastic member 40. In this case, the plurality of openings 44 are provided at positions corresponding to the body portion 20 of the container body 10.

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 (polyethylene) can be used. preferable. Further, the above-mentioned various resins may be blended and used. The container body 10 may be colored in colors such as red, blue, yellow, green, brown, black, and white, but is preferably colorless and transparent in consideration of ease of recycling. Further, a thin-film film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the container body 10 in order to enhance the barrier property of the container.

Further, the container body 10 can 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 has gas barrier properties and light-shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). A preform 10a composed of three or more layers may be formed as a resin (intermediate layer) having a gas barrier property and a light-shielding property by blow molding after extrusion molding. 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 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. Is.

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. 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, the body portion 20, and the bottom portion 30 of the container body 10, excluding the mouth portion 11 and the neck portion 13. As a result, desired functions and characteristics can be imparted to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10.

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

On the other hand, since the plastic member 40 is not welded or adhered to the container body 10, it can be peeled off from the container body 10 and removed. As described above, when the plastic member 40 has a plurality of openings 44 and a cutting region 45 that can be easily cut is formed along the openings 44, the cutting regions 45 are formed along the plurality of openings 44 (cutting regions 45). By cutting the plastic member 40 in the longitudinal direction, the plastic member 40 can be separated from the cutting region 45, and the plastic member 40 can be separated from the container body 10. As a result, when the container body 10 is discarded, the plastic member 40 can be easily separated and removed from the container body 10. As a result, the colorless and transparent container body 10 can be recycled as in the conventional case. In addition, in order to make the plastic member 40 easier to peel off, notches may be provided at the upper end and / or the lower end of the plastic member 40. Further, even when the plastic member 40 does not have such a cutting region, it is possible to cut the plastic member 40 using a cutting tool or the like. 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.

Examples of the shape of the opening 44 include, but are limited to, a circular shape, a rectangular shape, an elliptical shape, a rounded rectangular shape, a rhombic shape, a triangular shape, a pentagonal shape, a fletching shape, and a hexagonal shape. is not. Further, the width (diameter) of the opening 44 of the plastic member 40 is preferably 10 mm or less when mounted on the container body 10. The shortest distance between adjacent openings 44 of the plastic member 40 when mounted on the container body 10 is preferably 5 mm or less. As a result, the plurality of openings 44 can be used as guides when the plastic member 40 is peeled off.

The thickness of the plastic member 40a 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 FIGS. 4 and 5.

As shown in FIGS. 4 and 5, the composite preform 70 includes a preform 10a made of a plastic material and a bottomed cylindrical plastic member 40a provided on the outside of the preform 10a.

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

The plastic member 40a is a direct blow molded product obtained by a method including direct blow molding described later, is attached to the outer surface of the preform 10a without being adhered, and does not move or rotate with respect to the preform 10a. It is in close contact so that it does not fall due to its own weight. The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

In this case, the plastic member 40a is provided so as to cover the entire 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.

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

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

As shown in FIGS. 6A and 7, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. You may. 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. Further, as shown in FIGS. 6B and 8, the plastic member 40a may have a circular tube shape (bottomless cylindrical shape) as a whole by cutting the bottom portion of the bottomed cylindrical plastic member 40a.

As shown in FIGS. 7 and 8, the body 41 of the plastic member 40a may be provided with a plurality of openings 44a. Further, a part of the plurality of openings 44a is provided in the bottom portion 42, but the present invention is not limited to this, and the openings 44a may be provided only in the body portion 41. Further, although the plurality of openings 44a are arranged substantially evenly from the upper part to the lower part of the body portion 41, it does not matter whether the openings 44a are regularly arranged or irregularly arranged. By providing the body 41 of the plastic member 40a with the plurality of openings 44a in this way, the plastic member 40 can be cut in the longitudinal direction along the plurality of openings 44a after blow molding. As a result, the plastic member 40 can be peeled off from the container body 10, and the container body 10 can be easily recycled. Further, although not shown, the opening 44a can also be provided in the bottom portion 42 of the plastic member 40a. Since the opening 44b is provided in the bottom portion 42 of the plastic member 40a, the opening 44b serves as an escape route for air when the bottomed plastic member 40a is fitted into the preform 10a. Therefore, the plastic member 40a is used as the preform 10a. Can be installed smoothly.

7 (a) and 8 (a) show an example of an arrangement of openings 44a. In FIGS. 7A and 8A, the plurality of openings 44a are arranged in a row along the longitudinal direction of the plastic member 40a. In this case, after blow molding, the number of parts of the container body 10 that are not covered by the plastic member 40 is reduced, so that the functions such as barrier properties can be less likely to be impaired.

7 (b) and 8 (b) show another arrangement of openings 44a. In FIGS. 7 (b) and 8 (b), the plurality of openings 44a are arranged in a plurality of rows (for example, two rows) along the longitudinal direction of the plastic member 40a. In this case, it is possible to make it easier to peel off the plastic member 40 from the container body 10 after blow molding.

7 (c) and 8 (c) show another arrangement of openings 44a. In FIG. 7C, the plurality of openings 44a are arranged in a zigzag shape along the longitudinal direction of the plastic member 40a.
In this case, after blow molding, the plastic member 40 can be peeled off from the container body 10 without necessarily pulling it straight.

7 (d) and 8 (d) show other arrangements of openings 44a. In FIGS. 7 (d) and 8 (d), the plurality of openings 44a are arranged obliquely with respect to the axial direction of the plastic member 40a. In this case, after blow molding, the plastic member 40 can be pulled diagonally to be peeled from the container body 10.

The shape of the opening 44a is not limited, but is circular (FIG. 9 (a)), rectangular (FIG. 9 (b)), elliptical (FIG. 9 (c)), and rounded rectangular (FIG. 9 (c)). FIG. 9 (d)), rhombus shape (FIG. 9 (e)), triangle shape (FIG. 9 (f)), pentagonal shape (FIG. 9 (g)), arrow blade shape (FIG. 9 (h)), hexagonal shape. (FIG. 9 (i)) and the like may be used. Further, the width (diameter) of the opening 44a is preferably 10 mm or less in a state before the plastic member 40a is attached to the preform 10a and blow-molded. Further, in order to facilitate peeling of the plastic member 40 after blow molding, the shortest distance between adjacent openings 44a of the plastic member 40a while attached to the preform 10a is preferably 5 mm or less.

The number of openings 44a is not limited to this, but the total number of plastic members 40a may be, for example, 5 to 1000.

The plastic member 40a (40) comprises a crosslinked resin material. Since the plastic member 40a (40) contains the crosslinked resin material, the heat resistance, wear resistance, solvent resistance, and heat shrinkage of the plastic member 40a (40) can be improved.

The crosslinked resin material contained in the plastic member 40a (40) is subjected to (1) active light irradiation treatment or (2) water crosslinking treatment on the crosslinkable resin material, as will be described later. Can be obtained by

Examples of the crosslinkable resin material that is crosslinked by applying the active light irradiation treatment include PE, PP, polystyrene, polyvinylidene fluoride, polymethylacrylate, polyvinyl chloride, polybutadiene, natural rubber, vinyl alcohol, polyamide resin, and ethylene acetate. Vinyl copolymer (EVA) and the like can be mentioned.

Examples of the crosslinkable resin material that is crosslinked by the water crosslinking treatment include a silane crosslinkable polyolefin resin that forms a siloxane bond (Si—O—Si) by the water crosslinking treatment. The silane crosslinkable polyolefin resin can be obtained by copolymerizing ethylene with an ethylene-modified unsaturated silane compound. Examples of the ethylenically unsaturated silane compound include vinyltrimethoxysilane, vinyltriethoxysilane, vinylacetoxysilane, and γ-methacryloxypropylmethyldimethoxysilane.
Further, in one embodiment, the silane crosslinkable polyolefin resin is a polyolefin resin such as low density polyethylene, which is a free radical in the presence of an unsaturated silane compound such as vinylmethoxysilane and a free radical generator such as dicumyl peroxide. It can be obtained by heating above the decomposition temperature of the generator.
As the silane crosslinkable resin, a commercially available one may be used. For example, Mitsubishi Chemical Corporation's Linkron XLE815N, XCF710N, XCF730N, XHE740N, XHE650N, HM600A, XVF600N, XPM800HM, XPF860G, SS732N, LBC021-2, XCF800N, LBC022-1, PK500N, 5- Be done.

The content of the crosslinked resin material in the plastic member 40a (40) is preferably 60% by mass or more and 100% by mass or less, and more preferably 75% by mass or more and 100% by mass or less. By setting the content of the crosslinked resin material in the above numerical range, the heat resistance, wear resistance, solvent resistance and heat shrinkage of the plastic member 40a (40) can be more remarkably improved.

Further, the plastic member 40a (40) is, for example, polylactic acid, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, polyvinylidene chloride, polyvinyl acetate, as long as its properties are not impaired. , Polyvinylacetal, Polyvinylbutyral, Dialyl phthalate resin, Fluorine resin, 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, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, Other resin materials such as polyether sulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, and epoxy resin may be included.
Further, the plastic member 40a (40) may contain a copolymer in which two or more monomer units constituting the above resin are polymerized. Further, the plastic member 40a (40) 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 plastic member 40a (40) preferably contains a cross-linking agent, and examples of the cross-linking agent include hexamethylenediamine carbamate, dioltotrilguanidine, dicumyl peroxide, and 1,3-phenylene bisoxazoline. Can be mentioned.

The content of the cross-linking agent is preferably 0.1 to 5 parts by mass, preferably 0.1 to 5 parts by mass, when the total amount of the cross-linked resin material contained in the plastic member 40a (40) is 100 parts by mass. It is more preferably about 2 parts by mass.

Further, the plastic member 40a (40) preferably contains a cross-linking aid, and examples of the cross-linking agent include triallyl isocyanurate, triallyl cyanurate, diallyl fumarate, trimethylolpropane trimethacrylate, and tri. Examples thereof include methylolpropane triacrylate and ethylene glycol dimethacrylate.

The content of the cross-linking aid is preferably 0.1 to 5 parts by mass, preferably 0.1 to 5 parts by mass, when the total amount of the cross-linked resin material contained in the plastic member 40a (40) is 100 parts by mass. It is more preferably 1 to 2 parts by mass.

When the crosslinkable resin material is crosslinked by subjecting it to a water crosslinking treatment, the plastic member 40a (40) preferably contains a silanol condensation catalyst. The silanol condensation catalyst can be used without particular limitation as long as it can promote dehydration condensation between silanols. For example, metal carboxylates such as tin, zinc, iron and cobalt, organic bases, inorganic acids or organic acids can be mentioned, and more specifically, dibutyltin dilaurate, dibutyltin acetate, dioctyltin dilaurate and the like can be mentioned.

The content of the silanol condensation catalyst in the plastic member 40a (40) is 0.1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the total amount of the crosslinked resin material contained in the plastic member 40a (40). It is preferably 1 part by mass or more and 5 parts by mass or less. By setting the content of the silanol condensation catalyst in the above numerical range, the cross-linking reaction can be satisfactorily carried out, and the heat resistance, abrasion resistance, solvent resistance and heat shrinkage of the plastic member 40a (40) are improved. be able to.

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

Further, the plastic member 40a (40) may contain 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 (40) may contain 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 absorbing material such as a fatty acid salt may be mixed with these materials.

Further, the plastic member 40a (40) may contain 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, the plastic member 40a (40) may include a material having higher heat retention or cold retention (material having low thermal conductivity) than the plastic material constituting the preform 10a (container body 10). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. As a result, the heat-retaining property or the cold-retaining property of the composite container 10A is enhanced. For example, 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 Co., Ltd.), SX8782 , 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. It is more preferably about 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. It is more preferably about 20 parts by mass.

Further, the plastic member 40a (40) may contain a material that is less slippery than the plastic material constituting the preform 10a (container body 10). 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 (40) 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 may have no shrinking action on the preform 10a, or may have a shrinking action. After blow molding, the plastic member 40a has an action of contracting with respect to the preform 10a from the viewpoint that the amount of air entering between the container body and the plastic member 40 is small, that is, the adhesion is high. It is preferably a thing (shrink tube).

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

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

The plastic member 40a is
The step of heating and melting the mixture containing the above-mentioned crosslinkable resin material and
The process of extruding the heat-melted mixture to form a tubular parison,
In the mold, air is blown into the tubular parison, and the tubular parison is blow-molded according to the shape of the mold to obtain a direct blow-molded product.
The process of cross-linking the cross-linkable resin material contained in the direct blow molded product,
It is obtained by a method including.

A method of manufacturing the plastic member 40a according to the embodiment will be described with reference to FIG. First, as shown in FIG. 10A, the crosslinkable resin material and, if desired, the mixture 51 containing other resin materials, crosslinkers, additives and the like are heated and melted, extruded into a tube shape from the die 52, and tube-shaped. The parison 53 is formed. Next, as shown in FIG. 10 (b), the tubular parison 53 is sandwiched by, for example, a two-piece mold 54, and then, as shown in FIG. 10 (c), air is introduced into the tubular parison 53 from the blowing nozzle 55. The tubular parison 53 is molded according to the mold 54 (direct blow molding), cooled, opened, and taken out in sequence, whereby a bottomed cylindrical direct blow as shown in FIG. 10 (d) is performed. A molded product can be obtained. Further, the obtained direct blow molded article can be provided with an opening 44a by a conventionally known method, for example, by using a needle-shaped protrusion. A plastic member 40a can be obtained by subjecting this direct blow molded product to a cross-linking treatment and cross-linking the cross-linkable resin material contained in the molded product (not shown).

The heating and melting temperature of the mixture is preferably 150 to 250 ° C, more preferably 170 to 230 ° C. The extrusion of the mixture may be single-layered or multi-layered.

The plastic member 40a may be composed of multiple layers as described above, and for example, the layer structure of the innermost surface and the outermost surface may be the same or different. Such a multi-layered plastic member 40a can be produced by extruding in multiple layers as described above, but can also be produced by adhering two or more single-layered plastic members 40a. can.

According to the above 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 manufactured. Is.

Examples of the cross-linking treatment for the obtained direct blow molded article include (1) active light irradiation treatment and (2) water-crosslinking treatment.

In the present specification, the active light means radiation that chemically acts on a crosslinkable resin material to promote a crosslink reaction, and specifically, visible light, ultraviolet rays, X-rays, electron rays, and α. It means line, β-ray, γ-ray, 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 γ-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.

Examples of the method of the water cross-linking treatment include a method of immersing the direct blow molded product in water and a method of exposing the direct blow molded product to a high temperature and high humidity atmosphere. When the direct blow molded product is immersed in water, the temperature of the water is preferably 20 ° C. or higher and 90 ° C. or lower, and more preferably 45 ° C. or higher and 75 ° C. or lower. When the direct blow molded product is exposed to a high temperature and high humidity atmosphere, the temperature is preferably 20 ° C. or higher and 120 ° C. or lower, more preferably 45 ° C. or higher and 100 ° C. or lower, and the relative humidity is 50. % Or more, more preferably 80% or more.

Next, a method of manufacturing 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). 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 in the past may be used. The plastic member 40a may have a plurality of openings 44a.

Next, by providing the plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is produced (FIG. 11 (FIG. 11). b) See). In this case, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. The plastic member 40a is attached so as to cover the entire body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a.

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

In this way, a series of steps (FIGS. 11A to 11B) for producing the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a in advance to prepare the composite preform 70. )) And a series of steps (FIGS. 11 (c) to (f)) for producing the composite container 10A by blow molding can be carried out at different places (factory or the like).

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

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 11D).

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. 11D). In FIG. 11D, 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. 11E, 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. 11 (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.

Modifications Next, modifications of the first embodiment of the present invention will be described with reference to FIGS. 12 to 16.

The modified examples shown in FIGS. 12 to 16 do not have a body and a bottom as the plastic member 40a, but use a cylindrical plastic member 40a.

In the composite container 10A shown in FIGS. 12 and 13, the plastic member 40 extends from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20, but does not reach the bottom portion 30. Further, in the composite preform 70 shown in FIG. 8, 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 other configurations in FIGS. 12 to 16 are substantially the same as those of the embodiments shown in FIGS. 1 to 11. In the modified examples shown in FIGS. 12 to 16, the same parts as those of the embodiments shown in FIGS. 1 to 11 are designated by the same reference numerals, and detailed description thereof will be omitted.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiments shown in FIGS. 1 to 11, 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. 17 to 25 are views showing a second embodiment of the present invention. In FIGS. 17 to 25, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

First, with reference to FIGS. 17 to 19, the outline of the composite container produced by the blow molding method according to the present embodiment will be described.

As will be described later, the composite container 10A shown in FIGS. 17 to 19 is a composite preform 70 (FIGS. 20 and 21) including a preform 10a, an inner label member 60a, and a plastic member 40a using a blow molding die 50. It was obtained by integrally expanding the preform 10a, the inner label member 60a, and the plastic member 40a of the composite preform 70 by subjecting the composite preform 70 to 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, a body portion 20 provided below the shoulder portion 12, and a body. It is provided with a bottom portion 30 provided below the portion 20.

On the other hand, the inner label member 60 is in close contact with the outer surface of the container body 10 in a thinly extended state, and is in close contact with the container body 10 so as not to easily move or rotate.

Further, the plastic member 40 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 is in close contact with the container body 10 so as not to easily move or rotate. There is.

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. The inner label member 60 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. As shown in FIG. 12, the inner label member 60 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

In this case, the inner label member 60 is provided so as to cover the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, excluding the mouth portion 11 and the neck portion 13. As a result, desired characters, images, and the like can be added to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, and the composite container 10A can be decorated and information can be displayed.

The inner label member 60 may be provided in the entire area or a part of the container body 10 other than the mouth portion 11. For example, the inner label member 60 may be provided so as to cover the entire neck portion 13, shoulder portion 12, body portion 20, and bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of inner label members 60 is not limited to one, and a plurality of inner label members 60 may be provided. The inner label member 60 may be provided in the same area as the plastic member 40, or may be provided in a narrower area than the plastic member 40. In the latter case, 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, and is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is thinly stretched on the outer surface of the inner label member 60 to cover the inner label member 60. As shown in FIG. 19, 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. Further, the plastic member 40 may be provided with a plurality of openings 44. The configuration of the opening 44 is the same as that of the first embodiment described above. Further, although not shown, the inner label member 60 may also be provided with a plurality of openings so that the inner label member 60 can be peeled off and removed from the container body 10 together with the plastic member 40. In this case, the position of the opening of the inner label member 60 may be the same as or different from the position of the opening 44 of the plastic member 40.

In addition, the structure and manufacturing method of the container body 10 and the plastic member 40 are substantially the same as those of the first embodiment described above, and thus 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 FIGS. 20 and 21.

As shown in FIGS. 20 and 21, 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. It includes a bottomed cylindrical plastic member 40a provided in close contact with the outside of the member 60a.

The inner label member 60a is in close contact with the outer surface of the preform 10a, and is in close contact with the preform 10a in a state where it does not easily move or rotate. The inner label member 60a is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

The inner label member 60a may be pre-designed or printed. For example, in addition to the design, product name, and the like, character information such as the name of the content liquid, the manufacturer, and the name of the raw material may be described. In this case, it is possible to display 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, an inner label member 60a may be provided on all or a part of the body portion 20a of the preform 10a so that an image or characters can be displayed on the body portion 20 of the container body 10 after molding. This eliminates the need for a step of attaching a label using a labeler after sealing the container, so that the manufacturing cost can be suppressed and the yield can be prevented from being lowered.

As such an inner label member 60a, a film such as a polyester resin, a polyamide resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, or a fluorine resin can be used. The inner label member 60a may be made of the same material as the container body 10 (preform 10a) and / or the plastic member 40a, or may be made of a different material.

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

For example, the inner label member 60a may be made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, 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 or an oxygen absorbing material 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-retaining property or the cold-retaining property 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 a direct blow molded product obtained by a method including direct blow molding described later, is attached to the outer surface of the inner label member 60a without being adhered, and moves with respect to the preform 10a. Or, they are so close that they do not rotate, or they are so close that they do not fall under their own weight. 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. Further, the plastic member 40a may have a plurality of openings 44a, and the configuration of the openings 44a is the same as that of the first embodiment described above.

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 and the entire bottom portion 30a.

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

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

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

As shown in FIGS. 22A and 23, the plastic member 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. Is also good. 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. Further, as shown in FIGS. 22B and 24, the plastic member 40a may have a circular tube shape (bottomless cylindrical shape) as a whole by cutting the bottom portion of the bottomed cylindrical plastic member 40a.

Next, the blow molding method (manufacturing method of the composite container 10A) according to the present embodiment will be described with reference to FIGS. 25 (a) to 25 (f).

First, a preform 10a made of a plastic material is prepared (see FIG. 25 (a)). The plastic member 40a may have a plurality of openings 44a.

Next, the inner label member 60a is provided on the outer side of the preform 10a, and the plastic member 40a is provided on the outer side of the inner label member 60a. As a result, a composite preform 70 having 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 is produced (FIG. 25). (B)). In this case, the inner label member 60a has a bottomed cylindrical shape as a whole, and has a cylindrical body portion 61 and a bottom portion 62 connected to the body portion 61.

In this case, even if the inner label member 60a and the plastic member 40a having the same or slightly smaller inner diameter as the outer diameter of the preform 10a are pushed against the preform 10a, respectively, the inner label member 60a and the plastic member 40a are brought into close contact with the outer surface of the preform 10a. good.

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

In this way, a series of steps for producing the composite preform 70 by bringing the plastic member 40a into close contact with the outside of the preform 10a and the inner label member 60a in advance to prepare the composite preform 70 (FIG. 25 (FIG. 25). It becomes possible to carry out a series of steps (FIGS. 25 (d) to (f)) for producing the composite container 10A by blow molding at different places (factory or the like).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 25 (c)).

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50. The composite container 10A is molded 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 case of the first embodiment described above. A composite container 10A including the 60 and a plastic member 40 provided on the outside of the inner label member 60 is obtained (see FIGS. 25 (d)-(f)).

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

As described above, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding mold 50, the preform 10a of the composite preform 70, the inner label member 60a, and the plastic The manufacturing member 40a is integrally expanded to manufacture a composite container 10A including the container body 10, the inner label member 60, and the plastic member 40. Therefore, the inner label member 60 can be provided in advance on the composite container 10A at the stage of manufacturing the composite container 10A using the preform 10a. Therefore, it is not necessary to provide a step of filling the composite container 10A with the content liquid, sealing the container, and then 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. do not have.

Modifications Next, modifications of the present invention will be described with reference to FIGS. 26 to 30.

The modified examples shown in FIGS. 26 to 30 do not have a body and a bottom as the inner label member 60a and the plastic member 40a, but use the cylindrical inner label member 60a and the plastic member 40a. ..

In the composite container 10A shown in FIGS. 26 and 27, the inner label member 60 and the plastic member 40 extend from the shoulder portion 12 of the container body 10 to the lower portion of the body portion 20, but do not reach the bottom portion 30. Further, in the composite preform 70 shown in FIGS. 28 and 29, the inner label member 60a and the plastic member 40a are in close contact with each other so as to cover only the body portion 20a of the preform 10a. It covers an area excluding a portion 13a corresponding to the neck portion 13 of the container body 10 and a portion corresponding to the lower portion of the body portion 20a.

Other configurations in FIGS. 26 to 30 are substantially the same as those of the embodiments shown in FIGS. 17 to 25. In the modified examples shown in FIGS. 26 to 30, the same parts as those of the embodiments shown in FIGS. 17 to 25 are designated by the same reference numerals, and detailed description thereof will be omitted.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiments shown in FIGS. 17 to 25, and detailed description thereof will be omitted.

Claims (11)

In compound preform,
Has a torso and a bottom Preform made of plastic material and
It is provided with a plastic member of a direct blow molded product provided so as to surround the outside of the preform.
The plastic member contains a crosslinked resin material and has a heat shrinking action on the preform.
The plastic member is provided in close contact with the preform without being welded to the preform.
The plastic memberOf the positions corresponding to the bodyPenetrates the plastic member in the thickness directionpluralThe opening is, Along the longitudinal direction of the plastic member, or diagonally with respect to the axial direction of the plastic memberA composite preform characterized by being provided. The composite preform according to claim 1, wherein the crosslinked resin material is a resin material crosslinked by irradiation with active light or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si). The composite preform according to claim 1 or 2, wherein the plastic member comprises a cross-linking agent and / or a cross-linking aid. In a composite container
Has a torso and a bottom The container body made of plastic material and
It is provided with a plastic member of a direct blow molded product provided in close contact with the outside of the container body.
The plastic member contains a crosslinked resin material and has an action of heat-shrinking the container body.
The plastic member is provided in close contact with the container body without being welded to the container body.
The plastic memberOf the positions corresponding to the bodyPenetrates the plastic member in the thickness directionpluralThe opening is, Along the longitudinal direction of the plastic member, or diagonally with respect to the axial direction of the plastic memberA composite container characterized by being provided. The composite container according to claim 4, wherein the crosslinked resin material is a resin material crosslinked by irradiation with active light or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si). The composite container according to claim 4 or 5, wherein the plastic member comprises a cross-linking agent and / or a cross-linking aid. Has a torso and a bottom 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 plastic member
The plastic member is a direct blow molded product having a cylindrical body portion that covers at least the body portion of the preform.
The plastic member contains a crosslinked resin material and has a heat shrinking action.
The plastic member is provided in close contact with the preform without being welded to the preform.
The plastic memberOf the positions corresponding to the bodyPenetrates the plastic member in the thickness directionpluralThe opening is, Along the longitudinal direction of the plastic member, or diagonally with respect to the axial direction of the plastic memberA plastic member characterized by being provided. The plastic member according to claim 7, wherein the crosslinked resin material is a resin material crosslinked by irradiation with active light or a silane crosslinkable polyolefin resin having a siloxane bond (Si—O—Si). The plastic member according to claim 7 or 8, which comprises a cross-linking agent and / or a cross-linking aid. Has a torso and a bottom 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. In the method of manufacturing plastic parts
The process of heating and melting the mixture containing the crosslinkable resin material, and
The step of extruding the heat-melted mixture to form a tubular parison, and
In the mold, air is blown into the tubular parison, and the tubular parison is blow-molded according to the shape of the mold to obtain a direct blow-molded product.
A step of cross-linking the cross-linkable resin material contained in the direct blow molded product, and
Including
The plastic member has a heat shrinking action and
The plastic member is provided in close contact with the preform without being welded to the preform.
The plastic memberOf the positions corresponding to the bodyPenetrates the plastic member in the thickness directionpluralThe opening is, Along the longitudinal direction of the plastic member, or diagonally with respect to the axial direction of the plastic memberA method for manufacturing a plastic member, which is characterized in that it is provided. The method according to claim 10, wherein the step of cross-linking the crosslinkable resin material contained in the direct blow molded product is performed by an active light irradiation treatment or a water cross-linking treatment on the direct blow molded product.

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