JP7157934B2 - Composite container and its manufacturing method - Google Patents

Description

The present invention relates to a composite container and its manufacturing method.

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

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

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

JP 2009-241526 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite container capable of imparting various functions and characteristics to the container and a method of manufacturing the same.

The present invention provides a composite container,
a container body made of plastic material;
A plastic member is provided on the outer surface of the container body,
The container body and the plastic member are integrally expanded by blow molding,
The composite container is characterized in that an anchor coat layer is formed on at least the surface of the plastic member.

The present invention is a composite container, wherein the anchor coat layer is formed by an inkjet method.

The present invention is a composite container, wherein the anchor coat layer comprises an ionizing radiation-curable resin.

The present invention is a composite container, wherein a printed layer is formed on the surface of the anchor coat layer by an inkjet method.

The present invention is a composite container, wherein the anchor coat layer and the printed layer are formed in the same apparatus.

The present invention provides a method for manufacturing a composite container,
providing a preform made of plastic material;
a step of producing a composite preform having the preform and the plastic member in close contact with the outside of the preform by providing a plastic member so as to surround the outside of the preform;
heating and inserting the composite preform into a blow mold;
expanding the preform and the plastic member of the composite preform together by blow-molding the composite preform in the blow-molding mold;
forming an anchor coat layer on at least the surface of the plastic member of the inflated composite container.

The present invention is a method for producing a composite container, wherein the anchor coat layer is formed by an inkjet method.

The present invention is a method of manufacturing a composite container, wherein the anchor coat layer comprises an ionizing radiation-curable resin.

The present invention is a method for producing a composite container, wherein a printed layer is formed on the surface of the anchor coat layer by an inkjet method.

The present invention is a method of manufacturing a composite container, wherein the anchor coat layer and the printed layer are formed in the same apparatus.

According to the present invention, the preform and the plastic member of the composite preform are expanded together by subjecting the composite preform to blow molding in a blow molding die. Therefore, the preform (container body) and the plastic member can be constructed from separate members, and by appropriately selecting the type and shape of the plastic member, various functions and characteristics can be imparted to the composite container. can. In addition, since the anchor coat layer 80 is formed on the surface of the plastic member 40, when a print layer or the like is provided on the anchor coat layer, its adhesion is improved. Further, it is not necessary to subject the plastic member 40 to pretreatment such as corona treatment in order to improve adhesion. Further, by providing an anchor coat layer, bleeding of printing can be reduced.

1 is a partial vertical sectional view showing a composite container according to a first embodiment of the present invention; FIG. FIG. 2 is a partial vertical sectional view showing the composite container according to the first embodiment of the present invention; 3 is a horizontal cross-sectional view (cross-sectional view along line III-III in FIG. 1) showing the composite container according to the first embodiment of the present invention; FIG. 4 is a schematic diagram showing an example of a printer that forms an anchor coat layer and a print layer on a composite container; FIG. 5 is a schematic diagram showing another example of a printer that forms an anchor coat layer and a print layer on a composite container; FIG. 6 is a vertical sectional view showing a composite preform according to the first embodiment of the invention; 7(a) to (d) are perspective views showing various plastic members. 8A to 8F are schematic diagrams showing a blow molding method according to the first embodiment of the present invention; FIG. 9(a) to 9(f) are schematic diagrams showing a blow molding method according to a modification of the first embodiment of the present invention; FIG. 10(a) to 10(g) are schematic diagrams showing a blow molding method according to a modification of the first embodiment of the present invention; FIG. 11 is a partial vertical sectional view showing a modified example of the composite container according to the first embodiment of the present invention; FIG. 12 is a partial vertical sectional view showing a modification of the composite container according to the first embodiment of the present invention; FIG. 13 is a vertical sectional view showing a modified example of the composite preform according to the first embodiment of the present invention; FIG. 14A to 14F are schematic diagrams showing modifications of the blow molding method according to the first embodiment of the present invention; FIG. FIG. 15 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention; FIG. 16 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention; 17 is a horizontal cross-sectional view (cross-sectional view along line XVII-XVII in FIG. 15) showing the composite container according to the second embodiment of the present invention; FIG. 18 is a vertical sectional view showing a composite preform according to a second embodiment of the invention; 19(a)-(d) are perspective views showing various inner label members and various plastic members. 20(a) to (f) are schematic diagrams showing a blow molding method according to a second embodiment of the present invention; FIG. 21(a) to (f) are schematic diagrams showing a blow molding method according to a modification of the second embodiment of the present invention; FIG. 22(a) to (g) are schematic diagrams showing a blow molding method according to a modification of the second embodiment of the present invention; FIG. FIG. 23 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention; FIG. 24 is a partial vertical sectional view showing a modified example of the composite container according to the second embodiment of the present invention; FIG. 25 is a vertical sectional view showing a modified example of the composite preform according to the second embodiment of the present invention; 26(a) to (f) are schematic diagrams showing modifications of the blow molding method according to the second embodiment of the present invention.

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings. 1 to 13 are diagrams showing a first embodiment of the present invention.

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

The composite container 10A shown in FIG. 1 is produced by subjecting a composite preform 70 (see FIG. 6) including the preform 10a and the plastic member 40a to biaxial stretch blow molding using a blow molding die 50, as will be described later. An anchor coat layer 80 is formed on the surface of the plastic member 40 of the composite container 10A obtained by integrally expanding the preform 10a and the plastic member 40a of the composite preform 70 by applying the anchor coat layer 80 by a method described later. be.

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. At least the surface of the plastic member 40 is An anchor coat layer 80 is formed on the . Since the anchor coat layer 80 is formed on the surface of the plastic member 40, by printing on the anchor coat layer 80, when the printed layer 90 or the like is provided (see FIG. 2), the adhesion is improved. be. Further, it is not necessary to subject the plastic member 40 to pretreatment such as corona treatment in order to improve adhesion. Further, by providing the anchor coat layer 80, it is possible to reduce print bleeding. The anchor coat layer 80 may be formed at least on the surface of the plastic member 40, and may be formed on the surface of the container body 10 or the inner label member described later.

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

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

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

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

The neck portion 13 is located between the flange portion 17 and the shoulder portion 12 and has a substantially cylindrical shape with a substantially uniform diameter. The shoulder portion 12 is positioned between the neck portion 13 and the body portion 20 and has a shape whose diameter gradually increases from the neck portion 13 side toward the body portion 20 side.

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

On the other hand, the bottom portion 30 has a recess 31 located in the center and a grounding portion 32 provided around the recess 31 . The shape of the bottom portion 30 is also not particularly limited, and may have a conventionally known bottom portion shape (for example, a petaloid bottom shape, a round bottom shape, or the like).

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

Such a container body 10 can be produced by biaxially stretching blow molding a preform 10a (described later) produced by injection molding a synthetic resin material. As the material of the preform 10a, that is, the container body 10, thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate) can be used. preferable. Moreover, you may blend and use the various resin mentioned above. The container body 10 may be colored in red, blue, yellow, green, brown, black, white, or the like, but is preferably colorless and transparent in consideration of ease of recycling. Further, a deposited film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the container body 10 in order to improve the barrier properties of the container.

Further, the container body 10 can also be formed as a multi-layer molded bottle having two or more layers. That is, by extrusion molding or injection molding, for example, the intermediate layer is made of MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), PEN (polyethylene naphthalate), etc., with gas barrier properties and light shielding properties. A multilayer bottle having gas barrier properties and light shielding properties may be formed by extruding a preform 10a having three or more layers as a resin (intermediate layer), followed by blow molding. As the intermediate layer, a resin obtained by blending the various resins described above may be used.

In addition, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foamed preform having a foamed cell diameter of 0.5 to 100 μm is formed, and this foamed preform is blow-molded. Thus, the container body 10 may be produced. Since such a container body 10 incorporates foam cells, the light shielding property of the entire container body 10 can be enhanced.

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

Next, the plastic member 40 will be described. The plastic member 40 (40a) is provided so as to surround the outside of the preform 10a as will be described later, and is obtained by closely contacting the outside of the preform 10a and then biaxially stretch blow molding together with the preform 10a. It is a thing.

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

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

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

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

The plastic member 40a may be one that does not contract with respect to the preform 10a, or one that contracts.

When the plastic member 40a has a shrinking action on the preform 10a, the plastic member (shrinkable tube) 40a is provided outside the preform 10a and is heated integrally with the preform 10a. It is obtained by axial stretching blow molding. As such a plastic member (shrinkable tube) 40a, any material may be used as long as it has a function of shrinking the preform 10a. The plastic member (shrinkable tube) 40a itself may be shrinkable or elastic, and may be shrinkable without external action. Alternatively, the plastic member (shrinkable tube) 40a may shrink (for example, heat shrink) with respect to the preform 10a when an external action (for example, heat) is applied.

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

Next, the anchor coat layer 80 will be explained. The anchor coat layer 80 is formed at least on the surface of the plastic member 40 and covers the outer surface of the plastic member 40 . Further, as shown in FIG. 3, the anchor coat layer 80 is provided over the entire circumferential direction so as to surround the plastic member 40 and the container body 10, and has a substantially circular horizontal cross section. Note that the anchor coat layer 80 is not limited to this, and may be provided partially in the circumferential direction.

In this case, the anchor coat layer 80 is provided so as to cover the shoulder portion 12 , the body portion 20 and the plastic member 40 of the container body 10 excluding the mouth portion 11 and the neck portion 13 . The anchor coat layer 80 may be provided over the entire area or a partial area of the container body 10 as long as it is provided over at least the entire area or a partial area of the plastic member 40 . The anchor coat layer 80 may be provided, for example, only on the portion to be printed or the portion to be colored, ie, the portion to be provided with the print layer 90 described later. Furthermore, the number of anchor coat layers 80 is not limited to one, and a plurality of anchor coat layers may be provided.

An anchor coating agent containing a thermosetting resin or an ionizing radiation-curable resin is preferably used for forming the anchor coat layer 80 (80a). Those containing a resin are more preferable. An anchor coating agent containing a thermosetting resin and an ionizing radiation curable resin may also be used.

The ionizing radiation-curable resin is not particularly limited as long as it can be polymerized and cross-linked by irradiation with ionizing radiation such as ultraviolet rays and electron beams. Polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, Examples include spiroacetal resins, polybutadiene resins, polythiol polycyclic resins, and polyhydric alcohols. More specifically, polymethylolpropane tris having two or more unsaturated bonds, such as ethyl (meth)acrylate, ethylhexyl (meth)acrylate, styrene, methylstyrene, N-vinylpyrrolidone, etc., having one unsaturated bond. (meth)acrylate, hexanediol (meth)acrylate, tripropylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,6-hexane Examples include diol di(meth)acrylate, neopentyl glycol di(meth)acrylate, reaction products of the above compounds and (meth)acrylate, and the like. In addition, in this specification, "(meth)acrylate" refers to methacrylate and acrylate.
Furthermore, it is preferable to use these resins together with a photopolymerization initiator, and examples thereof include acetophenones, benzophenones, and benzils.

Examples of thermosetting resins include phenol resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, unsaturated polyester resins, polyurethane resins, epoxy resins, aminoalkyd resins, melamine-urea cocondensation resins, silicone resins, polysiloxane resin and the like. Furthermore, it is preferable to use these resins together with a thermal polymerization initiator, a curing accelerator, a curing agent, and the like.

The thickness of the anchor coat layer 80 is not limited to this, but can be, for example, about 0.1 μm to 30 μm when attached to the container body 10 .

The anchor coat layer 80 (80a) can be formed by a conventionally known method. For example, it is preferably formed by irradiating it with ionizing radiation and curing it. By forming the anchor coat layer 80 by the inkjet method, the formation of the anchor coat layer 80 and the formation of the print layer 90 can be carried out in the same apparatus, and the number of processes can be reduced. Also, an anchor coat layer 80 can be provided locally. In this case, for example, the anchor coat layer 80 can be formed by spraying the anchor coat agent from a direction substantially perpendicular to the outer surface of the plastic member 40 using a known printer 100 (printing device) in the ink jet method.

As the ionizing radiation, electromagnetic waves or charged particles having energy capable of causing a curing reaction of molecules in the ionizing radiation-curable resin are used. Ultraviolet rays or electron beams are usually used, but visible rays, X-rays, ion beams, etc. can also be used.

In this embodiment, the anchor coat layer 80 is formed on the plastic member 40 of the composite container 10A after blow molding. However, not limited to this, the anchor coat layer 80 can also be formed, for example, on the plastic member 40a before being attached to the preform 10a. It can also be formed on the plastic member 40a provided in the composite preform 70 before blow molding. Furthermore, it can also be formed on a resin sheet before being molded into a plastic member 40a, which will be described later.

A printed layer 90 may be provided on the surface of the anchor coat layer 80 of the composite container 10A. In this case, images and characters can be displayed on the composite container 10</b>A without attaching a separate label or the like to the container body 10 . The printed layer can be formed by a printing method such as an inkjet method, a gravure printing method, an offset printing method, or a flexo printing method, but is preferably formed by an inkjet method. For example, when using the inkjet method, a print layer can be formed by applying UV curing ink to the plastic member 40a, performing UV irradiation, and curing the ink. By forming the printed layer 90 by the inkjet method, the formation of the printed layer 90 and the formation of the anchor coat layer 80 can be performed in the same apparatus, and the number of processes can be reduced. In addition, fine adjustment is possible, such as providing the print layer 90 only on the anchor coat layer 80 formed only locally. Like the anchor coat layer 80, the printed layer 90 can be provided over the entire circumferential direction so as to surround the anchor coat layer 80, the plastic member 40, and the container body 10, or can be provided partially in the circumferential direction. Also good.

Next, the printer 100 and the method of forming the anchor coat layer 80 and the printed layer 90 using the printer 100 will be further described.

FIG. 4 shows an example of a printer for forming the anchor coat layer 80 and the printing layer 90. As shown in FIG. In FIG. 4, the printer 100 includes a head 101 on which the composite container 10A is mounted and which rotates (rotates and revolves) the composite container 10A, and an anchor coater which sprays an anchor coating agent onto the composite container 10A mounted on the head 101. an agent spraying unit 102; an anchor coating agent curing unit 103 that cures the anchor coating agent adhered to the composite container 10A to form the anchor coat layer 80; an ink spraying unit 104 that sprays ink onto the surface of the anchor coat layer 80; and an ink curing unit 105 that cures the ink to form the print layer 90 . In this case, the composite container 10A attached to the head 101 is sprayed with the anchor coating agent by the anchor coating agent spraying section 102 while rotating and revolving. Next, the composite container 10A is raised within the head 101, and the anchor coating agent is UV-cured in the anchor coating agent curing section 103, for example. Further, the composite container 10A rises within the head 101 and is sprayed with ink by the ink spraying section 104 . After that, the composite container 10A is lifted inside the head 101, and the ink is UV-cured in the ink curing section 105, for example. As a result, the anchor coat layer 80 is formed on the surface of the plastic member 40 , and the print layer 90 is formed on the surface of the anchor coat layer 80 .

FIG. 5 shows another example of a printer that prints on composite containers. In FIG. 5, the printer 100 has a plurality of wheels 106, 107, 108, 109 that convey the composite container 10A and rotate (rotate and revolve) the composite container 10A. The plurality of wheels 106, 107, 108, and 109 includes an anchor coating agent spraying wheel 106 for spraying an anchor coating agent, an anchor coating agent curing wheel 107 for curing the anchor coating agent adhered to the composite container 10A, and an ink spraying wheel for spraying ink. It includes a wheel 108 and an ink curing wheel 109 for curing deposited ink. In this case, the composite container 10A is sprayed with an anchor coating agent at the anchor coating agent spraying portion 110 of the anchor coating agent spraying wheel 106, conveyed to the anchor coating agent curing wheel 107, and then UV-cured, for example, to cure the anchor coating agent. An anchor coat layer 80 is formed on the surface of the plastic member 40 of 10A. Next, the composite container 10</b>A on which the anchor coat layer 80 is formed is sequentially conveyed by each ink spray wheel 108 while being sprayed with ink by the ink spray portion 111 of each ink spray wheel 108 . After that, the composite container 10A is conveyed to the ink curing wheel 109, where the ink is UV-cured, for example, to form the print layer 90 on the anchor coat layer 80 surface.

In the case of the above method, since the anchor coat layer 80 and the print layer 90 are not expanded, there is no risk of cracks occurring in the anchor coat layer 80 and the print layer 90, which is preferable. The formation timing of the anchor coat layer 80 and the print layer 90 may be before the content liquid is filled into the composite container 10A or after the composite container 10A is filled with the content liquid and sealed.

In the above description, the preform 10a and the plastic member 40a are expanded together, and then the anchor coat layer 80 and the print layer 90 are formed on the outside of the plastic member 40. However, this is not the only case. It is not something that can be done. For example, the composite preform 70 (FIG. 3) may be produced by providing the plastic member 40a on which the anchor coat layer 80a and the print layer 90a are formed in advance on the outside of the preform 10a. Thereafter, the anchor coat layer 80a and the print layer 90a may be stretched together with the plastic member 40a by subjecting the composite preform 70 to blow molding, thereby forming the anchor coat layer 80 and the print layer 90. FIG.

The formation of the anchor coat layer 80 and the print layer 90 may be repeated multiple times. As a result, defects such as cracks can be prevented from occurring in the anchor coat layer 80 and the print layer 90 even after being stretched after blow molding.

Next, referring to FIG. 6, the configuration of the composite preform according to this embodiment will be described.

As shown in FIG. 6, the composite preform 70 includes a plastic material preform 10a and a bottomed cylindrical plastic member 40a provided outside the preform 10a. An anchor coat layer 80a and a printed layer 90a may be formed on the surface of the plastic member 40a.

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

The plastic member 40a is attached to the outer surface of the preform 10a without being glued, and is in such close contact with the preform 10a that it does not move or rotate, or in such close contact that it does not fall under its own weight. . The plastic member 40a surrounds the preform 10a over its entire circumferential direction and has a circular horizontal cross section.

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

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

The plastic member 40a may be one that does not contract with respect to the preform 10a, or one that contracts. After blow molding, less air enters between the container body and the plastic member 40, that is, from the viewpoint of high adhesion, the plastic member 40a has the effect of shrinking with respect to the preform 10a. It is preferably a thing (shrinkable tube).

In the former case, the plastic member 40a includes, for example, a blow tube manufactured by blow molding, a sheet molded tube manufactured by sheet molding, an extruded tube manufactured by extrusion molding, an inflation molded tube manufactured by inflation molding, An injection-molded tube or the like can be used, but the present invention is not limited to this, and molding methods other than those described above may be used.

On the other hand, in the case where the plastic member (shrinkable tube) 40a has the effect of shrinking, the plastic member (shrinkable tube) 40a, for example, when subjected to an external action (for example, heat), is A material that shrinks (eg, heat shrinks) may be used. Alternatively, the plastic member (shrinkable tube) 40 itself may be shrinkable or elastic and may be shrinkable without external action.

The plastic member 40a may be multi-layered. For example, the innermost layer and the outermost layer may have the same or different main components. Specific layer structures include low-density PE/adhesive layer/EVOH/adhesive layer/low-density PE and PP/adhesive layer/EVOH/adhesive layer/PP from the innermost surface. Examples of adhesives constituting the adhesive layer include polyvinyl acetate-based adhesives, polyacrylic acid ester-based adhesives, cyanoacrylate-based adhesives, ethylene copolymer adhesives, cellulose-based adhesives, polyester-based adhesives, Examples include polyamide adhesives, polyimide adhesives, amino resin adhesives, phenol resin adhesives, epoxy adhesives, polyurethane adhesives, rubber adhesives, and silicone adhesives.

The plastic member 40a is made of, for example, polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl Alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluorine resin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylene Propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6, nylon 6,6, nylon MXD6, aromatic polyamide, polycarbonate, polyethylene terephthalate, polyethylene butylene terephthalate, polynaphthalene ethylene, U Polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyether sulfone, silicone resin, polyurethane, phenolic resin, urea resin, polyethylene oxide, It can be made using a resin material containing polypropylene oxide, polyacetal, epoxy resin, or the like. Among these, it is preferable to include thermoplastic inelastic resins such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Moreover, the resin material may contain a copolymer obtained by polymerizing two or more monomer units constituting the above-described resin. Furthermore, the resin material may contain two or more of the above resins. In addition, by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, a foamed member having a foamed cell diameter of 0.5 to 100 μm is used, and this foamed preform is molded. , the light-shielding property can be enhanced.

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

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

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

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

Further, the plastic member 40a may contain a material (a material with low thermal conductivity) that has higher heat retention or cold insulation than the plastic material that constitutes the container body 10 (preform 10a). For example, when the plastic member 40 (40a) consists of multiple layers, the plastic member 40 (40a) is a layer (low heat conductive layer). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. This enhances the heat retention or cold retention of the composite container 10A. For example, the body 20 of the container body 10 may be entirely or partially provided with a plastic member 40 to enhance the heat retention or cold insulation of the body 20 . Moreover, when the user grips the composite container 10A, it is possible to prevent the composite container 10A from being difficult to hold due to being too hot or too cold. Such materials include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. A foamed member having a foamed cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, may also be used. It is preferable to mix hollow particles with the resin material containing these resins. The average particle size of the hollow particles is preferably 1-200 μm, more preferably 5-80 μm. The "average particle size" means the volume average particle size, and is measured by a known method using a particle size distribution/particle size distribution analyzer (e.g., Nanotrac particle size distribution analyzer manufactured by Nikkiso Co., Ltd.). can do. The hollow particles may be organic hollow particles made of resin or the like, or inorganic hollow particles made of glass or the like. Hollow particles are preferred. Examples of resins constituting organic hollow particles include styrene resins such as crosslinked styrene-acrylic resins, (meth)acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluorine resins, polyamide resins, and polyimides. resins, polycarbonate resins, polyether resins, and the like. In addition, Low Pake HP-1055, Low Pake HP-91, Low Pake OP-84J, Low Pake Ultra, Low Pake SE, Low Pake ST (manufactured by Rohm and Haas Co., Ltd.), Nipol MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782 , SX866 (manufactured by JSR Corporation) and other commercially available hollow particles can also be used. When the plastic member 40a is a single layer, the content of the hollow particles is preferably 0.01 to 50 parts by mass with respect to 100 parts by mass of the resin material contained in the plastic member 40a. More preferably, it is up to 20 parts by mass. Further, when the plastic member 40a is composed of multiple layers, it is preferably 0.01 to 50 parts by mass, preferably 1 to 20 parts by mass, with respect to 100 parts by mass of the resin material contained in the layer containing the hollow particles. It is more preferable to have

Further, the plastic member 40a may contain a material that is less slippery than the plastic material that constitutes the container body 10 (preform 10a). For example, when the plastic member 40 (40a) is multi-layered, the plastic member 40 (40a) has an outermost layer made of a material that is less slippery than the plastic material forming the container body 10 (preform 10a). may be In this case, the composite container 10A can be easily gripped by the user without changing the material of the container body 10 . For example, a plastic member 40 may be provided on all or part of the trunk portion 20 of the container body 10 to make the trunk portion 20 easier to hold.

Further, the plastic member 40a may have a design or printing. In this case, images and characters can be displayed on the composite container 10A without attaching a separate label or the like to the container body 10 after blow molding. For example, the plastic member 40 may be provided on all or part of the trunk portion 20 of the container body 10 to display an image or characters on the trunk portion 20 . Printing may be performed by applying a design or printing to the plain plastic member 40a by a printing method such as an inkjet method, a gravure printing method, an offset printing method, or a flexographic printing method. For example, when using the inkjet method, a print layer can be formed by applying UV curing ink to the plastic member 40a, performing UV irradiation, and curing the ink. This printing may be applied to the plastic member (shrinkable tube) 40a before being attached to the preform 10a, or may be applied while the plastic member 40a is provided outside the preform 10a. Furthermore, printing may be applied to the plastic member 40 of the composite container 10A after blow molding. The material of the plastic member 40 may be the same as that of the container main body 10 or may be different from that of the container main body 10 . Moreover, the plastic member 40a may be colored in red, blue, yellow, green, brown, black, white, or the like, and may be transparent or opaque.

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

As shown in FIG. 7A, 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 (body portion 81). You may have In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, various functions and characteristics can be imparted to the bottom portion 30 in addition to the body portion 20 of the composite container 10A. Examples of such a plastic member 40a include the above-described blow tube, sheet-molded tube, and injection-molded tube.

Further, as shown in FIG. 7B, the plastic member 40a may have a circular tubular shape (bottomless cylindrical shape) as a whole, and may have a cylindrical body portion 41. As shown in FIG. In this case, as the plastic member 40a, for example, the aforementioned blow tube, extruded tube, inflation-molded tube, sheet-molded tube, or injection-molded tube can be used.

Alternatively, as shown in FIGS. 7(c) and 7(d), the plastic member 40a may be produced by forming a film into a cylinder and adhering the ends thereof. In this case, as shown in FIG. 7(c), the plastic member 40a may be configured in a tubular shape (bottomless cylindrical shape) having a body portion 41 (body portion 81), as shown in FIG. 7(d). As shown, the bottom portion 42 (bottom portion 82) may be bonded together to form a bottomed tubular shape. In this case, for example, a blow tube, an extruded tube, an inflation-molded tube, a sheet-molded tube, or an injection-molded tube can be used as the plastic member 40a.

Further, the plastic member 40a may have an anchor coat layer 80a and a printed layer 90a formed on its surface.

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

In one embodiment, the plastic member 40a can be manufactured by molding a resin sheet containing a resin material. Examples of the forming method include deep drawing, or a method of forming a resin sheet into a tubular shape and fusing or adhering the ends thereof. Moreover, the plastic member 40a composed of multiple layers can be obtained by molding a laminated resin sheet in which two or more resin sheets are laminated via the above-described adhesive.

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

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

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

In one embodiment, the plastic member 40a can also be manufactured by extruding a heat-melted resin material into a tubular shape. The multilayered plastic member 40a can be obtained by co-extrusion of two or more resin materials. The plastic member 40a can also be obtained by extruding the mixture in a mold and further blow-molding the mixture in the mold so as to expand the diameter along the inner surface of the mold.

Further, one end of the tube obtained by extruding the resin material is closed by adhesion, welding, or the like. A tube closed at one end is placed in a tubular mold having an inner diameter greater than the outer diameter of the tube and a blowing device is placed at the other end of the tube. At this time, the blow device is preferably brought into close contact with the tube so that air does not leak from between them. The tube, mold and blowing device are then sent into a heating furnace in this arrangement and heated to 70-150° C. inside the heating furnace. As the heating furnace, a hot air circulating heating furnace may be used in order to make the inside temperature uniform. Alternatively, the tubes, molds and blowing apparatus may be heated by passing them through heated liquids. Next, the tube, the mold and the blowing device are removed from the heating furnace, and the inner surface of the tube is pressurized and stretched by blowing air into the tube from the blowing device. As a result, the tube expands and expands along the shape of the inner surface of the mold. After that, the tube is cooled in cold water while air is being blown from the blow device, and the tube is removed from the mold. By cutting this to a desired size, a shrinkable plastic member 40a is obtained.

In one embodiment, the plastic member 40a can also be obtained by injection molding. Specifically, first, the resin material is heated and melted. Next, the heated and melted resin material is injected into the mold. The plastic member 40a can also be obtained by cooling it and removing it from the inside of the mold.

Next, a manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 8(a) to 8(f). In this embodiment, an example will be described in which the anchor coat layer 80 and the print layer 90 are applied (not shown) to the plastic member 40 after blow molding.

First, a preform 10a made of plastic material is prepared (see FIG. 8(a)). In this case, for example, the preform 10a may be produced by an injection molding method using an injection molding machine (not shown). Further, as the preform 10a, a preform generally used conventionally may be used.

Next, by providing a plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is produced (FIG. 8 ( b) see). In this case, the plastic member 40 a has a bottomed cylindrical shape as a whole, and has a cylindrical trunk portion 41 and a bottom portion 42 connected to the trunk portion 41 . The plastic member 40a is attached so as to cover the entire area of the body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a.

In this case, a plastic member 40a having an inner diameter that is the same as or slightly smaller than the outer diameter of the preform 10a may be pressed into the preform 10a to adhere to the outer surface of the preform 10a. Alternatively, as will be described later, a heat-shrinkable plastic member 40a is provided on the outer surface of the preform 10a, and the plastic member 40a is heated to 50° C. to 100° C. to heat-shrink the outer surface of the preform 10a. may be adhered to.

In this way, by bonding the plastic member 40a to the outside of the preform 10a in advance to fabricate the composite preform 70, a series of steps for fabricating the composite preform 70 (Fig. 8(a) to (b) )) and a series of steps (FIGS. 8(c) to (f)) for manufacturing the composite container 10A by blow molding can be performed at separate locations (factories, etc.).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 8(c)). At this time, the composite preform 70 is evenly heated in the circumferential direction by the heating device 51 while rotating with the opening 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90.degree. C. to 130.degree.

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 8(d)).

The composite container 10A is molded using this blow molding die 50. As shown in FIG. In this case, the blow-molding mold 50 is composed of a pair of split body molds 50a and 50b and a bottom mold 50c (see FIG. 8(d)). In FIG. 8(d), the pair of body molds 50a and 50b are open from each other, and the bottom mold 50c is raised upward. In this state, the composite preform 70 is inserted between the pair of body molds 50a and 50b.

Next, as shown in FIG. 8(e), after the bottom mold 50c is lowered, the pair of trunk molds 50a and 50b are closed, and the pair of trunk molds 50a and 50b and the bottom mold 50c are closed. A blow molding mold 50 is constructed. Next, air is forced into the preform 10a and the composite preform 70 is subjected to biaxial stretch blow molding.

As a result, the container body 10 is obtained from the preform 10a in the blow molding die 50. As shown in FIG. During this time, the body molds 50a, 50b are heated to 30°C to 80°C, and the bottom mold 50c is cooled to 5°C to 25°C. At this time, in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded together. As a result, the preform 10 a and the plastic member 40 a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50 .

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

Next, as shown in FIG. 8(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 removed from the blow molding mold 50. Next, as shown in FIG.

Modification of Method for Manufacturing Composite Container 10A Next, a modification of the method (blow molding method) for manufacturing the composite container 10A according to the present embodiment will be described with reference to FIGS. 9(a) to 9(f). The modification shown in FIGS. 9(a) to 9(f) has a plastic member (shrinkable tube) 40a which has the effect of shrinking the preform 10a. It is substantially the same as the form shown in (f). In FIGS. 9A to 9F, the same parts as those in FIGS. 8A to 8F are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of plastic material is prepared (see FIG. 9(a)).

Next, a plastic member (shrinkable tube) 40a is provided outside the preform 10a (see FIG. 9(b)). In this case, the plastic member (shrinkable tube) 40 a has a cylindrical shape with a bottom as a whole, and has a cylindrical trunk portion 41 and a bottom portion 42 connected to the trunk portion 41 . This plastic member (shrinkable tube) 40 is attached so as to cover the entire area of the body portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a.

Next, the preform 10a and the plastic member (shrinkable tube) 40a are heated by the heating device 51 (see FIG. 9(c)). At this time, the preform 10a and the plastic member (shrinkable tube) 40a are evenly heated in the circumferential direction by the heating device 51 while rotating with the opening 11a facing downward. The heating temperature of the preform 10a and the plastic member (shrinkable tube) 40a in this heating step may be, for example, 90°C to 130°C.

As the plastic member (shrinkable tube) 40a is heated in this manner, the plastic member (shrinkable tube) 40a is thermally shrunk and closely adheres to the outside of the preform 10a (see FIG. 9(c)). If the plastic member (shrinkable tube) 40a itself has shrinkability, the plastic member (shrinkable tube) 40a is provided outside the preform 10a (see FIG. 9(b)). The tube) 40a may adhere to the outside of the preform 10a.

Subsequently, the preform 10a and the plastic member (shrinkable tube) 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 9(d)).

The preform 10a and the plastic member (shrinkable tube) 40a are molded using this blow molding die 50, and the container main body 10, A composite container 10A including a plastic member (shrinkable tube) 40 provided on the outer surface of the container body 10 is obtained (see FIGS. 9(d) to (f)).

Next, another modification of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 10(a) to 10(g). In the modification shown in FIGS. 10(a) to 10(g), the plastic member (shrinkable tube) 40a has the effect of shrinking the preform 10a, and the preform 10a and the plastic member (shrinkable tube) 40a are separated into two parts. Heating is performed in stages, and other configurations are substantially the same as those shown in FIGS. 8(a) to (f). In FIGS. 10(a) to (g), the same parts as those in FIGS. 8(a) to (f) are denoted by the same reference numerals, and detailed description thereof will be omitted.

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

Next, a plastic member (shrinkable tube) 40a is provided outside the preform 10a (see FIG. 10(b)). In this case, the plastic member (shrinkable tube) 40 a has a cylindrical shape with a bottom as a whole, and has a cylindrical trunk portion 41 and a bottom portion 42 connected to the trunk portion 41 . This plastic member (shrinkable tube) 40 is attached so as to cover the entire area of the body portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a.

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

When the plastic member (shrinkable tube) 40a is heated, the plastic member (shrinkable tube) 40a is thermally shrunk and tightly adheres to the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and the plastic member (shrinkable tube) 40a tightly adhered to the outside of the preform 10a is obtained (see FIG. 10(c)).

As described above, the plastic member (shrinkable tube) 40a is heated and adhered to the outside of the preform 10a in advance using the first heating device 55, and the composite preform 70 is manufactured. A series of steps for manufacturing (FIGS. 10A to 10C) and a series of steps for manufacturing the composite container 10A by blow molding (FIGS. 10D to 10G) are performed at separate locations (factories, etc.). can be implemented in

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

Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 10(e)).

The composite preform 70 is molded using this 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 FIGS. A composite container 10A including a shrinkable tube (shrinkable tube) 40 is obtained (see FIGS. 10(e) to 10(g)).

As described above, according to the present embodiment, the preform 10a of the composite preform 70 and the plastic member 40a are integrated by blow-molding the composite preform 70 in the blow molding die 50. to produce a composite container 10A including the container body 10 and the plastic member 40. As a result, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be constructed from separate members. Therefore, by appropriately selecting the type and shape of the plastic member 40, various functions and characteristics can be imparted to the composite container 10A.

Further, according to the present embodiment, since the anchor coat layer 80 is formed at least on the surface of the plastic member 40, when the print layer 90 or the like is provided on the anchor coat layer 80, the adhesion is improved. . Moreover, it is not necessary to subject the plastic member 40 to pretreatment such as corona treatment in order to improve the adhesion of the printed layer 90 . Further, by providing the anchor coat layer 80, it is possible to reduce print bleeding.

Modification Next, a modification of the first embodiment of the present invention will be described with reference to FIGS. 11, 12, 13 and 14(a) to 14(f).

The modifications shown in FIGS. 11, 12, 13 and 14(a) to (f) use a cylindrical plastic member 40a instead of having a trunk and a bottom as the plastic member 40a. It is.

In the composite container 10A shown in FIG. 11, the plastic member 40 extends from the shoulder 12 of the container body 10 to the lower portion of the body 20, but does not reach the bottom 30. As shown in FIG. The anchor coat layer 80 is provided on the surface of the plastic member 40 so as to cover it. Moreover, as shown in FIG. 12, a printed layer 90 may be provided on the surface of the anchor coat layer 80 .

In the composite preform 70 shown in FIG. 13, the plastic member 40a is in close contact so as to cover only the trunk portion 20a of the preform 10a. It covers the area except for the portion 13a corresponding to and the portion corresponding to the lower portion of the trunk portion 20a. An anchor coat layer 80a and a printed layer 90a may be formed on the surface of the plastic member 40a.

11, 12, 13 and 14(a)-(f) are substantially the same as the embodiment shown in FIGS. 1-10. 11, 12, 13 and 14 (a) to (f), the same parts as in the embodiment shown in FIGS. 1 to 10 are denoted by the same reference numerals, and detailed description thereof is omitted do.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiment shown in FIGS. 1 to 10, so detailed description thereof will be omitted. Also, in FIGS. 11, 12, 13 and 14(a) to (f), the plastic member 40 may have a contraction action on the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. 15 to 26 are diagrams showing a second embodiment of the present invention. 15 to 26, the same parts as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, with reference to FIGS. 15 and 16, an outline of a composite container produced by the blow molding method according to this embodiment will be described.

The composite container 10A shown in FIG. 15 is manufactured by using a blow molding die 50 to form a composite preform 70 (FIG. 18) including a preform 10a, an inner label member 60a, a plastic member 40a, and optionally a protective layer 80a. ) is subjected to biaxial stretch blow molding to integrally expand the preform 10a of the composite preform 70, the inner label member 60a and the plastic member 40a of the composite container 10A. An anchor coat layer 80 is formed on the surface by the method described above. A printed layer 90 may be formed on the surface of the anchor coat layer 80 (see FIG. 16).

Such a composite container 10A includes a container main body 10 made of a plastic material located inside, an inner label member 60 provided in close contact with the outside of the container main body 10, and a label member 60 provided in close contact with the outer side of the inner label member 60. An anchor coat layer 80 is formed on at least the surface of the plastic member 40 .

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

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

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

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

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

The inner label member 60 is attached to the outer surface of the container body 10 without being adhered, and is in close contact with the container body 10 so as not to move or rotate. The inner label member 60 is thinly stretched on the outer surface of the container body 10 to cover the container body 10 . As shown in FIG. 17, the inner label member 60 is provided over the entire circumference of the container body 10 so as to surround the container body 10, and has a substantially circular horizontal cross section.

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

Note that the inner label member 60 may be provided on the entire area or a partial area of the container body 10 other than the mouth portion 11 . For example, the inner label member 60 may be provided so as to cover the entire neck portion 13 , shoulder portion 12 , body portion 20 and bottom portion 30 of the container body 10 excluding the mouth portion 11 . Furthermore, the inner label member 60 is not limited to one, and a plurality of inner label members may be provided. The inner label member 60 may be provided in the same area as the plastic member 40 or may be provided in a narrower area than the plastic member 40 . In the latter case, inner label member 60 is preferably completely covered by plastic member 40 .

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

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

The plastic member 40 is attached to the outer surface of the inner label member 60 without being adhered, and is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is stretched thinly on the outer surface of the inner label member 60 to cover the inner label member 60 . As shown in FIG. 17, the plastic member 40 is provided over the entire circumference of the container body 10 so as to surround it, and has a substantially circular horizontal cross section.

In addition, the configuration of the container body 10, the plastic member 40, the anchor coat layer 80, and the print layer 90 is substantially the same as that of the first embodiment described above, so detailed description thereof will be omitted here.

Next, referring to FIG. 18, the configuration of the composite preform according to this embodiment will be described.

As shown in FIG. 18, the composite preform 70 includes a preform 10a made of a plastic material, a bottomed cylindrical inner label member 60a provided in close contact with the outer side of the preform 10a, and an inner label member 60a. A bottomed cylindrical plastic member 40a is provided in close contact with the outside. An anchor coat layer 80a and a printed layer 90a may be formed on the surface of the plastic member 40a.

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

The inner label member 60a may be pre-designed or printed. For example, character information such as the name of the content liquid, the manufacturer, the raw material name, etc. may be described in addition to the design, product name, and the like. In this case, images and characters can be displayed on the composite container 10A without attaching a separate label or the like to the container body 10 after blow molding. For example, an inner label member 60a may be provided on all or part of the trunk portion 20a of the preform 10a so that an image or characters are displayed on the trunk portion 20 of the container body 10 after molding. This eliminates the need for a labeling step using a labeler after the container is sealed, thereby reducing the manufacturing cost and preventing a decrease in yield.

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

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

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

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

In addition, the inner label member 60a may be made of a material (a material with low thermal conductivity) that has higher heat retention or cold insulation than the plastic material that constitutes the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. This enhances the heat retention or cold retention of the composite container 10A. Such materials include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. Further, it preferably comprises hollow particles. The average particle size of the hollow particles is preferably 1-200 μm, more preferably 5-80 μm. The hollow particles may be organic hollow particles made of resin or the like, or inorganic hollow particles made of glass or the like. Hollow particles are preferred. Examples of the resin that constitutes the organic hollow particles include those similar to those described above. In addition, the commercially available hollow particles can also be used. The content of the hollow particles is preferably 0.01 to 50 parts by mass, more preferably 1 to 20 parts by mass, with respect to 100 parts by mass of the resin contained in the inner label member 60a.

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

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

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

The plastic member 40a may be one that does not contract with respect to the preform 10a, or one that contracts.

In the latter case, the plastic member (shrinkable tube) 40a may be any material that has the effect of shrinking the preform 10a. The plastic member (shrinkable tube) 40a preferably shrinks (for example, heat shrinks) with respect to the preform 10a when an external action (for example, heat) is applied.

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

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

As shown in FIG. 19A, the plastic member 40a (inner label member 60a) has a bottomed cylindrical shape as a whole. 61) connected to the bottom portion 42 (bottom portion 62). In this case, the bottom portion 42 (bottom portion 62) of the plastic member 40a (inner label member 60a) covers the bottom portion 30a of the preform 10a. and properties can be given.

As shown in FIG. 19(b), the plastic member 40a (inner label member 60a) has a circular tubular shape (bottomless cylindrical shape) as a whole, and has a cylindrical trunk portion 41 (trunk portion 61). may have. In this case, for example, an extruded tube can be used as the plastic member 40a (inner label member 60a).

Further, as shown in FIGS. 19(c) and 19(d), the plastic member 40a (inner label member 60a) may be produced by forming a film into a tubular shape and adhering the ends thereof. good. In this case, as shown in FIG. 19(c), the plastic member 40a may be configured in a tubular shape (bottomless cylindrical shape) having a body portion 41 (body portion 61), or as shown in FIG. 19(d). 2, the bottom portion 42 (bottom portion 62) may be bonded together to form a bottomed tubular shape.

Further, an anchor coat layer 80a and a printed layer 90a may be formed on the surface of the plastic member 40a.

Next, a manufacturing method (blow molding method) for the composite container 10A according to the present embodiment will be described with reference to FIGS. In this embodiment, a case where the anchor coat layer 80 is applied (not shown) to the plastic member 40 after blow molding will be described as an example.

First, a preform 10a made of plastic material is prepared (see FIG. 20(a)).

Next, an inner label member 60a is provided outside the preform 10a, and a plastic member 40a is provided outside the inner label member 60a. As a result, a composite preform 70 having the preform 10a, the inner label member 60a in close contact with the outer side of the preform 10a, and the plastic member 40a in close contact with the outer side of the inner label member 60a is manufactured (FIG. 20). (b)). In this case, the inner label member 60 a has a cylindrical shape with a bottom as a whole, and has a cylindrical trunk portion 61 and a bottom portion 62 connected to the trunk portion 61 .

At this time, the inner label member 60a and the plastic member 40a, which have inner diameters that are the same as or slightly smaller than the outer diameter of the preform 10a, may be pressed against the preform 10a, respectively, to adhere to the outer surface of the preform 10a. good. Alternatively, the inner label member 60a and the plastic member 40a having heat shrinkability are provided on the outer surface of the preform 10a, and the inner label member 60a and the plastic member 40a are heated to 50° C. to 100° C. to be thermally shrunk. It may be brought into close contact with the outer surface of the preform 10a.

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

In this way, the plastic member 40a is brought into close contact with the outer sides of the preform 10a and the inner label member 60a in advance to produce the composite preform 70, thereby producing a series of steps for producing the composite preform 70 (FIG. 20 ( a) to (b)) and a series of steps (FIGS. 20(d) to (f)) for manufacturing the composite container 10A by blow molding can be performed at separate locations (factories, etc.).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 20(c)).

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow mold 50 . The composite container 10A is molded using this blow molding die 50, and the container body 10 and the inner label member provided on the outer surface of the container body 10 are formed in substantially the same manner as in the first embodiment described above. 60 and the plastic member 40 provided outside the inner label member 60 is obtained (see FIGS. 20(d)-(f)).

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

Modified Example of Manufacturing Method of Composite Container 10A Next, a modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. The modification shown in FIGS. 21(a) to 21(f) has a plastic member (shrinkable tube) 40a which has the effect of shrinking the preform 10a. It is substantially the same as the form shown in (f). In FIGS. 21(a) to (f), the same parts as those in FIGS. 20(a) to (f) are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of plastic material is prepared (see FIG. 21(a)).

Next, an inner label member 60a is provided outside the preform 10a, and a plastic member (shrinkable tube) 40a is provided outside the inner label member 60 (see FIG. 21(b)). The inner label member 60a and the plastic member (shrinkable tube) 40a are attached so as to cover the entire area of the body portion 20a excluding the portion corresponding to the neck portion 13 of the container body 10 and the entire bottom portion 30a. At least a part of the plastic member (shrinkable tube) 40a may be translucent or transparent.

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

Next, the preform 10a, the inner label member 60a and the plastic member (shrinkable tube) 40a are heated by the heating device 51 (see FIG. 21(c)). At this time, the preform 10a, the inner label member 60a and the plastic member (shrinkable tube) 40a are evenly heated in the circumferential direction by the heating device 51 while rotating with the opening 11a facing downward. The heating temperature of the preform 10a, the inner label member 60a and the plastic member (shrinkable tube) 40a in this heating step may be, for example, 90.degree. C. to 130.degree.

As the plastic member (shrinkable tube) 40a is heated in this manner, the plastic member (shrinkable tube) 40a is thermally shrunk and closely adheres to the outside of the preform 10a (see FIG. 21(c)). In the case where the plastic member (shrinkable tube) 40a itself has shrinkability, the plastic member (shrinkable tube) 40a (see FIG. 21(b)) is placed outside the inner label member 60a. A shrink tube) 40a may adhere to the outside of the inner label member 60a.

Subsequently, the preform 10a, the inner label member 60a and the plastic member (shrinkable tube) 40a heated by the heating device 51 are sent to the blow mold 50 (see FIG. 21(d)).

The preform 10a, the inner label member 60a and the plastic member (shrinkable tube) 40a are molded using this blow molding die 50, and are molded in substantially the same manner as in FIGS. A composite container 10A comprising the container body 10, the inner label member 60 provided on the outer surface of the container body 10, and the plastic member (shrinkable tube) 40 provided on the outer side of the inner label member 60 is obtained (Fig. 21(d)-(f)).

Next, another modification of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 22(a) to (g). In the modification shown in FIGS. 22(a) to (g), the plastic member (shrinkable tube) 40a has the effect of shrinking the preform 10a, and the preform 10a and the plastic member (shrinkable tube) 40a are separated into two parts. Heating is performed in stages, and other configurations are substantially the same as those shown in FIGS.
In FIGS. 22(a) to (g), the same parts as those in FIGS. 20(a) to (f) are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, a preform 10a made of plastic material is prepared (see FIG. 22(a)).

Next, an inner label member 60a is provided outside the preform 10a, and a plastic member (shrinkable tube) 40a is provided outside the inner label member 60a (see FIG. 22(b)). A plastic member (shrinkable tube) 40a is attached so as to cover the entire area of the body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire area of the bottom portion 30a. At least a part of the plastic member (shrinkable tube) 40a may be translucent or transparent.

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

Next, the preform 10a, the inner label member 60a and the plastic member (shrinkable tube) 40a are heated by the first heating device 55 (see FIG. 22(c)). At this time, the heating temperature of the preform 10a, the inner label member 60a and the plastic member (shrinkable tube) 40a may be, for example, 50.degree. C. to 100.degree.

When the plastic member (shrinkable tube) 40a is heated, the plastic member (shrinkable tube) 40a is thermally shrunk and tightly adheres to the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a, the inner label member 60 closely attached to the outside of the preform 10a, and the plastic member (shrinkable tube) 40a closely attached to the outside of the inner label member 60a is obtained. (See FIG. 22(c)).

As described above, the plastic member (shrinkable tube) 40a is heated and adhered to the outside of the preform 10a and the inner label member 60 in advance by using the first heating device 55, thereby fabricating the composite preform 70. A series of steps for producing the composite preform 70 (FIGS. 22(a) to (c)) and a series of steps for producing the composite container 10A by blow molding (FIGS. 22(d) to (g)) are separated. It becomes possible to carry out at a place (factory, etc.).

Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 22(d)). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the opening 11a facing downward. The heating temperature of the preform 10a, the inner label member 60a and the plastic member (shrinkable tube) 40a in this heating step may be, for example, 90.degree. C. to 130.degree.

Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 22(e)).

The composite preform 70 is molded using this 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 FIGS. A composite container 10A including the inner label member 60a and the plastic member (shrinkable tube) 40a provided outside the inner label member 60a is obtained (see FIGS. 22(e) to (g)).

As described above, according to the present embodiment, the preform 10a of the composite preform 70, the inner label member 60a and the plastic material are molded by blow-molding the composite preform 70 in the blow molding mold 50. The composite container 10A including the container main body 10, the inner label member 60, and the plastic member 40 is produced by expanding the product member 40a as one. Therefore, the inner label member 60 can be provided in advance on the composite container 10A at the stage of manufacturing the composite container 10A using the preform 10a. Therefore, it is not necessary to provide a step of applying a label by a labeler after the composite container 10A is filled with the content liquid and sealed. Thereby, the manufacturing cost for manufacturing the final product can be suppressed.
In addition, it is possible to prevent a decrease in yield when manufacturing the final product due to defects in the labeler or the like.

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

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

Modification Next, a modification of the present invention will be described with reference to FIGS. 23 to 26(a) to (f).

23 to 26(a) to (f), the inner label member 60a and the plastic member 40a do not have a trunk portion and a bottom portion, but have a cylindrical inner label member 60a and a plastic member. 40a is used.

In the composite container 10A shown in FIG. 23, the inner label member 60, the plastic member 40 and the anchor coat layer 80 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. do not have. Further, in the composite container shown in FIG. 24, the printed layer 90 does not reach the bottom portion 30 either. In the composite preform 70 shown in FIG. 25, the inner label member 60a and the plastic member 40a are closely attached so as to cover only the body portion 20a of the preform 10a. It covers the area excluding the portion 13a corresponding to the neck portion 13 of the main body 10 and the portion corresponding to the lower portion of the body portion 20a. An anchor coat layer 80a and a printed layer 90a may be formed on the surface of the plastic member 40a.

Other configurations in FIGS. 23 to 26(a) to (f) are substantially the same as the embodiment shown in FIGS. 15 to 22. FIG. In the modification shown in FIGS. 23 to 26(a) to (f), the same parts as those in the embodiment shown in FIGS. 15 to 22 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In addition, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those of the embodiment shown in FIGS. 15 to 22, so detailed description thereof will be omitted. In addition, in FIGS. 23 to 26(a) to (f), the plastic member 40 may have a contraction action on the preform 10a.

Claims (9)

In a composite container,
a container body made of plastic material;
A plastic member is provided on the outer surface of the container body,
The container body includes a bottom portion having a centrally located recess and a grounding portion provided around the recess,
the recess is recessed inwardly of the bottom of the container body;
The container body and the plastic member are integrally expanded by blow molding,
An anchor coat layer is formed on at least the surface of the plastic member,
The plastic member has heat shrinkability,
The plastic member is provided with a cutting line for peeling and removing the plastic member,
A composite container, wherein the plastic member is provided in close contact with the bottom surface of the recess and the grounding portion along the shapes of the recessed portion and the grounding portion of the bottom portion of the container body. The composite container according to claim 1, wherein the anchor coat layer is formed by an inkjet method. 3. The composite container according to claim 1, wherein the anchor coat layer comprises an ionizing radiation-curable resin. The composite container according to any one of claims 1 to 3, wherein a printed layer is formed on the surface of the anchor coat layer by an inkjet method. In the method for manufacturing a composite container,
providing a preform made of plastic material;
a step of producing a composite preform having the preform and the plastic member in close contact with the outside of the preform by providing a plastic member so as to surround the outside of the preform;
heating and inserting the composite preform into a blow mold;
Blow molding is performed on the composite preform in the blow molding mold to integrally expand the preform and the plastic member of the composite preform, and a container body corresponding to the preform; forming a plastic member provided in close contact with the outside of the container body;
forming an anchor coat layer on at least the surface of the expanded plastic member;
The container body includes a bottom portion having a centrally located recess and a grounding portion provided around the recess,
the recess is recessed inwardly of the bottom of the container body;
The plastic member has heat shrinkability,
The plastic member is provided with a cutting line for peeling and removing the plastic member,
Manufacture of a composite container, wherein the plastic member is provided in close contact with the bottom surface of the recess and the grounding portion along the shape of the recessed portion and the grounding portion of the bottom portion of the container body. Method. 6. The method of manufacturing a composite container according to claim 5, wherein the anchor coat layer is formed by an inkjet method. 7. The method of manufacturing a composite container according to claim 5, wherein the anchor coat layer contains an ionizing radiation-curable resin. The method for producing a composite container according to any one of claims 5 to 7, further comprising forming a printed layer on the surface of the anchor coat layer by an inkjet method. 9. The method of manufacturing a composite container according to claim 8, wherein the anchor coat layer and the printed layer are formed in the same apparatus.

Images