JP7116903B2 - Composite container and manufacturing method thereof, composite preform and manufacturing method thereof, and plastic member - Google Patents

Description

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

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).

In response to this, the applicant of the present application has proposed a composite container capable of imparting various functions and characteristics to the container in Patent Document 1.

JP 2015-128858 A

The composite container disclosed in Patent Document 1 is obtained by blow molding a composite preform comprising a container body and a plastic member. In such a composite container, it is possible to shield the content liquid filled in the composite container from external light by using a plastic member with improved light blocking properties. However, when the light-shielding property of the plastic member is enhanced, it is difficult to check the amount of the liquid content and the like from the outside of the composite container.

The present invention has been made in consideration of these points. An object of the present invention is to provide a manufacturing method, a composite preform and its manufacturing method, and a plastic member.

The present invention provides a composite container comprising a container body and a plastic member provided in close contact with the outside of the container body, wherein the plastic member comprises a light shielding part for blocking visible light and a light in the visible light range. having an average transmittance higher than that of the light-shielding portion by 30% or more, and both the light-shielding portion and the light-transmitting portion are formed in at least one horizontal section of the plastic member. , which is a composite container.

The present invention is the composite container, wherein the translucent part extends in the longitudinal direction of the plastic member.

The present invention is the composite container, wherein the translucent part extends over the entire longitudinal direction of the plastic member.

The present invention is a composite container in which the light shielding portions and the light transmitting portions are alternately formed along the circumferential direction in the horizontal cross section.

The present invention is the composite container, wherein the light-shielding portion and the light-transmitting portion are formed along the thickness direction in the horizontal cross section.

The present invention provides a composite preform for a composite container, comprising a preform and a plastic member provided so as to surround the outer side of the preform, the plastic member being in close contact with the outer side of the preform. wherein the plastic member has a light-shielding portion that blocks visible light and a light-transmitting portion that has an average transmittance of light in the visible light region that is 30% or more higher than that of the light-shielding portion, and at least one of the plastic members A composite preform in which both the light-shielding portion and the light-transmitting portion are formed in the horizontal cross section of the location.

The present invention is a composite preform in which the translucent part extends in the longitudinal direction of the plastic member.

The present invention is a composite preform in which the translucent part extends over the entire longitudinal direction of the plastic member.

The present invention is a composite preform in which the light-shielding portions and the light-transmitting portions are alternately formed along the circumferential direction in the horizontal cross section.

The present invention is a composite preform in which the light-shielding portion and the light-transmitting portion are formed along the thickness direction in the horizontal cross section.

The present invention provides a method of manufacturing a composite container, comprising the steps of preparing a preform, providing a plastic member outside the preform, and blow-molding the preform and the plastic member. a step of expanding the preform and the plastic member integrally by, wherein the plastic member includes a light shielding portion that blocks visible light and an average transmittance of light in the visible light region that is 30% higher than that of the light shielding portion. and a light-transmitting portion having a height greater than or equal to that of the plastic member, and wherein both the light-shielding portion and the light-transmitting portion are formed in at least one horizontal cross-section of the plastic member.

The present invention provides a method of manufacturing a composite preform, comprising the steps of preparing a preform and providing a plastic member outside the preform, wherein the plastic member serves as a light shielding portion that blocks visible light. and a light-transmitting portion having an average transmittance of light in the visible light region higher than that of the light-shielding portion by 30% or more, and in at least one horizontal cross section of the plastic member, the light-shielding portion and the light-transmitting portion are separated from each other. A method of manufacturing a composite preform in which both are formed.

The present invention is a plastic member that is attached so as to surround the outside of a preform, and has a cylindrical body that covers the body of the preform, and the body is a light shielding portion that blocks visible light. and a light-transmitting portion having an average transmittance of light in the visible light region higher than that of the light-shielding portion by 30% or more, and in at least one horizontal cross-section of the plastic member, the light-shielding portion and the light-transmitting portion is a plastic member on which both are formed.

ADVANTAGE OF THE INVENTION According to this invention, the quantity of the content with which the composite container was filled, etc. can be visually recognized, maintaining the light-shielding property of a composite container.

1 is a partial vertical sectional view showing a composite container according to one embodiment of the present invention; FIG. FIG. 2 is a horizontal cross-sectional view (cross-sectional view taken along line II-II in FIG. 1) showing a composite container according to one embodiment of the present invention; FIG. 3 is a partial vertical cross-sectional view showing a composite preform according to one embodiment of the invention; FIG. 4 is a horizontal cross-sectional view (cross-sectional view along line IV-IV in FIG. 3) showing a composite preform according to one embodiment of the present invention; 5(a) to (d) are perspective views showing various plastic members. 6(a) to 6(f) are schematic diagrams showing a method of manufacturing a composite container according to an embodiment of the present invention; FIG. 7(a) to 7(f) are schematic diagrams showing a method of manufacturing a composite container according to a modification of the embodiment of the present invention; FIG. 8(a) to 8(g) are schematic diagrams showing a method of manufacturing a composite container according to a modification of the embodiment of the present invention; FIG. 9(a) to 9(c) are horizontal sectional views showing modifications of the composite preform according to one embodiment of the present invention.

An embodiment of the present invention will be described below with reference to the drawings. 1 to 8 are diagrams showing one embodiment of the present invention.

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

Configuration of Composite Container The composite container 10A shown in FIGS. 1 and 2 is formed into a composite preform 70 (see FIG. 3) including the preform 10a and the plastic member 40a using a blow molding die 50, as will be described later. It is obtained by expanding the preform 10a of the composite preform 70 and the plastic member 40a integrally by performing biaxial stretch blow molding.

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

Of these, the container body 10 includes a mouth portion 11, a neck portion 13 provided below the mouth portion 11, a shoulder portion 12 provided below the neck portion 13, a body portion 20 provided below the shoulder portion 12, and a body 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. Also, the mouth portion 11 may be subjected to a whitening (crystallization) treatment. In this case, the light shielding property of the composite container 10A can be further enhanced.

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).

Also, the thickness of the container body 10 at the trunk portion 20 is not limited to this, but can be reduced to, for example, approximately 100 μm or more and 350 μm or less. Further, the weight of the container body 10 is not limited to this, but for example, when the content of the container body 10 is 500 ml, it can be 10 g or more and 25 g or less. 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 container body 10, it is preferable to use a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate). 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. Moreover, you may blend and use the various resin mentioned above. 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 injection molding, for example, the intermediate layer is formed of a gas barrier resin (intermediate layer) such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), or PEN (polyethylene naphthalate). Alternatively, the preform 10a having three or more layers may be injection-molded and then blow-molded to form a multi-layer bottle having gas barrier properties. 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 a melt of a thermoplastic resin, a foamed preform having a foamed cell diameter of 0.5 μm or more and 100 μm or less is molded, and this foamed preform is blow molded. You may manufacture the container main body 10 by doing. Since such a container body 10 incorporates foam cells, the light shielding property of the entire container body 10 can be enhanced.

Such a container body 10 may be made of a bottle with a full filling capacity of 100 ml μm and 2000 ml or less, for example. Alternatively, the container body 10 may be a large bottle with a full filling capacity of, for example, 10 Lμm60 L or less.

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

The plastic member 40 may be provided on the entire area or a partial area of the container body 10 other than the mouth portion 11 . For example, the plastic member 40 may be provided so as to entirely cover the shoulder portion 12 , body portion 20 and bottom portion 30 of the container body 10 excluding the mouth portion 11 and neck portion 13 . Alternatively, it may be provided so as to entirely cover the shoulder portion 12 , the body portion 20 and the bottom portion 30 of the container body 10 excluding the mouth portion 11 , the neck portion 13 and the central portion of the bottom portion 30 .

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. Thereby, the plastic member 40 can be separated and removed from the container body 10 .

In the present embodiment, the plastic member 40 includes a light blocking portion 48 that blocks visible light (light having a wavelength of 400 nm or more and 800 nm or less), and a translucent portion that has an average transmittance of light in the visible light range that is 30% or more higher than that of the light blocking portion 48. a portion 49; That is, when the average transmittance of light in the visible light region of the light shielding portion 48 is X%, the average transmittance of light in the visible light region of the translucent portion 49 is X+30% or more. In this case, the area of the light blocking portion 48 is larger than the area of the light transmitting portion 49 . In addition, the area of the plastic member 40 excluding the translucent portion 49 is entirely a light shielding portion 48 . In addition, in each figure, the light shielding part 48 is shaded for convenience.

The light shielding portion 48 is an area that shields visible light, as described above, and has an average transmittance of light in the visible light range of 0% or more and 60% or less. Therefore, it is substantially difficult to accurately visually recognize the contents filled inside the container body 10 through the light shielding portion 48 . The light shielding portion 48 may be colored with colors such as red, blue, yellow, green, brown, black, white, gold, and silver.

As described above, the translucent portion 49 is a region in which the average transmittance of light in the visible light region is higher than that of the light shielding portion 48 by 30% or more, and is a transparent or translucent region. Specifically, the average transmittance of light in the visible light region of the translucent portion 49 is 30% or more and 100% or less. Therefore, it is possible to visually recognize the contents filled inside the transparent container main body 10 through the translucent portion 49 . The translucent portion 49 may be colorless, or may be colored in red, blue, yellow, green, brown, black, white, or the like. In addition, one or more scale lines may be formed on the translucent portion 49 by printing, unevenness of the container body 10, or the like. In this case, the amount of the content filled inside the container body 10 can be visually measured through the translucent portion 49 .

The translucent portion 49 extends in a belt shape from the upper end to the lower end of the plastic member 40 . Boundary lines B1 and B2 between the light-transmitting portion 49 and the light-shielding portion 48 may be formed in substantially straight lines in the substantially vertical direction, or may be formed in a slightly curved (for example, wavy) shape. Further, the translucent portion 49 extends over the entire length of the plastic member 40 . That is, both the light shielding portion 48 and the light transmitting portion 49 are formed in an arbitrary horizontal cross section of the plastic member 40 (cross section perpendicular to the axial direction of the plastic member 40). However, this is not the only option, and the translucent portion 49 may be formed only partially in the longitudinal direction of the plastic member 40 . That is, both the light shielding portion 48 and the light transmitting portion 49 should be formed in at least one horizontal section of the plastic member 40 .

In the horizontal cross section of the plastic member 40 (see FIG. 2), the translucent portion 49 is formed only at one location in the circumferential direction. The angle θ of the translucent portion 49 about the vertical axis of the plastic member 40 is 2° or more and 60° or less. In addition, not only this but the translucent part 49 may be formed in multiple pieces along the circumferential direction. Moreover, it is preferable that the width W1 of the translucent portion 49 (the length along the circumferential direction of the plastic member 40) is set to 1 mm or more and 30 mm or less. By setting the angle θ and the width W1 of the translucent portion 49 within the above ranges, it is possible to visually recognize the contents through the translucent portion 49 while maintaining the light shielding property of the light shielding portion 48 . In addition, the width W1 of the translucent portion 49 in the circumferential direction is smaller than the width of the light shielding portion 48 . In this case, the incidence of light from the translucent portion 49 can be minimized.

Such a plastic member 40 may be one that does not have a contracting action with respect to the preform 10a, or one that has a contracting action.

Examples of the plastic member 40 include 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, fluorine rubber, nylon 6, nylon 6,6, aromatic polyamide, polycarbonate, polyethylene terephthalate, polyethylene butylene terephthalate, polynaphthalene ethylene, U polymer, Liquid crystal polymer, modified polyphenylene ether, polyetherketone, polyetheretherketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyethersulfone, silicone resin, polyurethane, phenolic resin, urea resin, polyethylene oxide, polypropylene oxide , polyacetal, epoxy resin, and the like. Among these, thermoplastic inelastic resins such as polyethylene (PE) such as low density polyethylene (LDPE), polypropylene (PP), polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) are preferably used. A blend material, a multilayer structure, or a partially multilayer structure may also be used. Furthermore, various additives other than the main component resin may be added to the material of the plastic member 40 as long as the characteristics of the plastic member 40 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 μm or more and 100 μm or less can be used to mold this foamed preform. can improve the light shielding property.

The plastic member 40 may be made of a light barrier material that blocks invisible light 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. As such a material, a blend material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered. Also, a foam member having a foam cell diameter of 0.5 μm or more and 100 μm or less, which is produced by mixing an inert gas (nitrogen gas, argon gas) into a melt of a thermoplastic resin, may be used.

The plastic member 40 may be made of a material (a material with low thermal conductivity) that has higher cold-retaining or heat-retaining properties 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. Thereby, the cold-retaining property or heat-retaining property of the composite container 10A is enhanced. 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 cold or too hot. Such materials include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, and the like. It is preferable to mix hollow particles with the resin material containing these resins. The average particle diameter of the hollow particles is preferably 1 μm or more and 200 μm or less, more preferably 5 μm or more and 80 μm or less. 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. The content of the hollow particles is preferably 0.01 parts by mass or more and 50 parts by mass or less, more preferably 1 part by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the resin material contained in the plastic member 40. It is more preferable to have

Further, the plastic member 40 may be made of a material that is less slippery than the plastic material that constitutes the container body 10 (preform 10a). In this case, the composite container 10A can be easily gripped by the user without changing the material of the container body 10 .

In addition, in the present embodiment, the light blocking portion 48 and the light transmitting portion 49 are made of the same main material. In this case, the light shielding portion 48 and the light transmitting portion 49 may contain the same main material, and only the light shielding portion 48 may be colored. However, the present invention is not limited to this, and the light shielding portion 48 and the light transmitting portion 49 may be made of different main materials.

The plastic member 40 may be previously printed with a design or print. In this case, printing may be performed by applying a design or printing to the plastic member 40 by a printing method such as an inkjet method or a gravure printing method. This printing may be applied to the plastic member 40 before being attached to the preform 10a, or may be applied while the plastic member 40 is provided outside the preform 10a.

The thickness of the plastic member 40 is not limited to this, but can be, for example, about 5 μm or more and 500 μm or less when attached to the container body 10 .

Construction of Composite Preform Next, the construction of the composite preform according to this embodiment will be described with reference to FIG.

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

The preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. Of these, the mouth portion 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 container body 10 and the entire area of the bottom portion 30a in the trunk portion 20a.

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 portion 13a corresponding to the neck portion 13 and the mouth portion 11a. Alternatively, the plastic member 40a may be provided so as to cover the portion 13a corresponding to the neck portion 13 and the body portion 20a except for the bottom portion 30. FIG.

The plastic member 40a has a light blocking portion 48a that blocks visible light, and a translucent portion 49a that has an average transmittance of light in the visible light range that is 30% or more higher than that of the light blocking portion 48a. Both the light shielding portion 48a and the light transmitting portion 49a are formed in at least one horizontal section of the plastic member 40a. In this embodiment, both the light shielding portion 48a and the light transmitting portion 49a are formed in any horizontal cross section. Each light-transmitting portion 49a is formed in a strip shape over the entire area of the plastic member 40a in the vertical direction.

As the material of the plastic member 40a, the materials described above are used. The thickness of the plastic member 40a can be, for example, about 50 μm or more and 1000 μm or less.

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

In the case where the plastic member (outer shrinkable member) 40a has a shrinking action, the plastic member (outer shrinkable member) 40a is, for example, applied to the preform 10a when an external action (for example, heat) is applied. A material that shrinks (for example, heat shrinks) may be used. Alternatively, the plastic member (outer shrinkable member) 40a itself may be shrinkable or elastic, and may be shrinkable without external action.

Examples of the plastic member 40a include a direct blow tube made by direct blow molding, a sheet molded tube made by sheet molding, an extruded tube made by extrusion molding, an injection molded tube made by injection molding, and an inflation molding. Although an inflation-molded tube or the like produced by the method can be used, the present invention is not limited to this, and molding methods other than those described above may be used.

For example, when the plastic member 40a is an extruded tube, first, the resin material for the light shielding portion 48a and the resin material for the light transmitting portion 49a are arranged in the circumferential direction, heated and melted, and extruded to obtain the above plastic material. A member 40a is obtained. When the plastic member 40a is a direct blow tube, the resin material for the light shielding portion 48a and the resin material for the light transmitting portion 49a are heat-melted and extruded in a circumferentially arranged state to produce a tubular parison. After that, air is blown into the tubular parison in a mold for blow molding to obtain the plastic member 40a.

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

As shown in FIGS. 3 and 5(a), the plastic member 40a 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. can be In this case, since the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, various functions and characteristics such as barrier properties can be imparted to the bottom portion 30 in addition to the body portion 20 of the composite container 10A. can be done. Examples of such a plastic member 40a include the above-described direct blow tube, sheet-molded tube, and injection-molded tube.

Further, as shown in FIG. 5B, 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 above-described blow tube, extruded tube, inflation-molded tube, or sheet-molded tube can be used.

Alternatively, as shown in FIGS. 5(c) and 5(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. 5(c), the plastic member 40a may be configured in a tubular shape (bottomless cylindrical shape) having a body portion 41, and as shown in FIG. 5(d), The bottom portion 42 may be attached to form a cylindrical shape with a bottom.

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

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

Next, the plastic member 40a is prepared. 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 . At least the body portion 41 of the plastic member 40 has a light blocking portion 48a that blocks visible light, and a translucent portion 49a that has an average transmittance of light in the visible light range that is 30% or more higher than that of the light blocking portion 48a. The translucent portion 49a is formed in a strip shape along the longitudinal direction of the body portion 41. As shown in FIG.

Next, by providing a plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is manufactured (FIG. 6 ( b) see).

In this case, a plastic member 40a having an inner diameter equal to or slightly smaller than the outer diameter of the preform 10a may be pressed into the preform 10a so as to adhere to the outer surface of the preform 10a. 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. You may let it adhere 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. 6(a) to (b) )) and a series of steps (FIGS. 6(c) to (f)) for manufacturing the composite container 10A by blow molding can be performed at separate locations (factories, etc.).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 6(c)). At this time, the composite preform 70 is evenly heated in the circumferential direction by the heating device 51 while rotating with the opening 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90.degree. C. to 160.degree.

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

The composite container 10A is molded using this blow molding die 50. As shown in FIG. In this case, the blow-molding mold 50 is composed of a pair of split body molds 50a and 50b and a bottom mold 50c (see FIG. 6(d)). In FIG. 6(d), the pair of body molds 50a and 50b are open from each other, and the bottom mold 50c is raised upward. In this state, the composite preform 70 is inserted between the pair of body molds 50a and 50b.

Next, as shown in FIG. 6(e), after the bottom mold 50c is lowered, the pair of trunk molds 50a and 50b are closed, and the pair of trunk molds 50a and 50b and the bottom mold 50c are closed. A blow molding mold 50 is constructed. Next, a stretch rod is inserted into the preform 10a and raised, followed by pressurization of air, 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 20°C to 80°C, and the bottom mold 50c is cooled to 5°C to 30°C. At this time, in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded together. As a result, the preform 10 a and the plastic member 40 a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50 .

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

Next, as shown in FIG. 6(f), the pair of body molds 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.

Subsequently, the composite container 10A is filled with a content such as a beverage, and the opening 11 is fitted with a cap (not shown). In this case, since the transparent portion 49 is formed in the plastic member 40 of the composite container 10A, the presence/absence, amount, color, etc. of the beverage filled in the composite container 10A can be visually recognized from the outside. On the other hand, since the entire area of the plastic member 40 excluding the light-transmitting portion 49 is the light-shielding portion 48, deterioration of the beverage filled in the composite container 10A due to visible light is minimized.

As described above, according to the present embodiment, the plastic member 40 of the composite container 10A includes the light shielding portion 48 that shields visible light, and the translucent portion that has an average transmittance of light in the visible light region higher than that of the light shielding portion 48 by 30% or more. a portion 49; Both the light shielding portion 48 and the light transmitting portion 49 are formed in at least one horizontal section of the plastic member 40 . In this case, the translucent part 49 serves as a window part for confirming the inside of the composite container 10A. As a result, while the light shielding portion 48 maintains the light shielding property of the composite container 10A, the amount of the contents filled in the composite container 10A can be visually recognized through the light transmitting portion 49. FIG.

Further, according to the present embodiment, since the translucent portion 49 extends along the longitudinal direction of the plastic member 40, even if the amount of the contents filled in the composite container 10A is large, the amount of the content may be small. You can check the quantity of the contents, etc.

Furthermore, according to the present embodiment, since the translucent portion 49 extends over the entire longitudinal direction of the plastic member 40, the content is not limited to the upper limit of the composite container 10A even if the content is filled up to the upper limit of the composite container 10A. Even if it is not in 10A, it is possible to check the amount of the contents.

Furthermore, 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. Moreover, since the plastic member 40a is provided outside the preform 10a, there is no need to prepare new molding equipment for molding the preform 10a.

Modification of Composite Container Manufacturing Method Next, a modification of the composite container 10A manufacturing method (blow molding method) according to the present embodiment will be described with reference to FIGS. 7(a) to 7(f). The modification shown in FIGS. 7(a) to 7(f) has a plastic member (outer shrinkable member) 40a which has the effect of shrinking the preform 10a. It is substantially the same as the form shown in (f). In FIGS. 7A to 7F, the same parts as those in FIGS. 6A to 6F are denoted by the same reference numerals, and detailed description thereof is omitted.

First, a preform 10a is prepared (see FIG. 7(a)). Next, a plastic member (outer shrinkable member) 40a is provided outside the preform 10a (see FIG. 7(b)). In this case, the plastic member (outer shrinkable 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 . This plastic member (outer shrinkable member) 40a is attached so as to cover the entire area of the body portion 20a and the bottom portion 30a.

Next, the preform 10a and the plastic member (outer shrinkable member) 40a are heated by the heating device 51 (see FIG. 7(c)). At this time, the preform 10a and the plastic member (outer shrinkable member) 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 (outer shrinkable member) 40a in this heating step may be, for example, 90°C to 160°C.

By heating the plastic member (outer shrinkable member) 40a in this manner, the plastic member (outer shrinkable member) 40a is thermally shrunk and adheres to the outside of the preform 10a (see FIG. 7(c)). . If the plastic member (outer shrinkable member) 40a itself has shrinkability, the plastic member will be The (outer shrinkable member) 40a may be in close contact with the outside of the preform 10a.

Subsequently, the preform 10a and the plastic member (outer shrinkable member) 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 7(d)). In this case, the heating for thermally shrinking the plastic member (outer shrinkable member) 40a and the heating for blow-molding the preform 10a can be performed in the same step.

The preform 10a and the plastic member (outer shrinkable member) 40a are molded using this blow molding die 50, and the container body 10 and the container body 10 are molded in substantially the same manner as in FIGS. , and a plastic member (outer shrinkable member) 40 provided on the outer surface of the container body 10 is obtained (see FIGS. 7(d) to (f)).

Another Modification of the Composite Container Manufacturing Method Next, another modification of the composite container 10A manufacturing method (blow molding method) according to the present embodiment will be described with reference to FIGS. 8(a) to 8(g). In the modification shown in FIGS. 8(a) to 8(g), the plastic member (outer shrinkable member) 40a has the effect of shrinking the preform 10a, and the preform 10a and the plastic member (outer shrinkable member) 40a is heated in two steps, and other configurations are substantially the same as those shown in FIGS. In FIGS. 8A to 8G, the same parts as those in FIGS. 6A to 6F are denoted by the same reference numerals, and detailed description thereof is omitted.

First, a preform 10a is prepared (see FIG. 8(a)). Next, a plastic member (outer shrinkable member) 40a is provided outside the preform 10a (see FIG. 8(b)). The plastic member 40a is a bottomless cylindrical tube having a cylindrical body portion 41. As shown in FIG.

Next, the preform 10a and the plastic member (outer shrinkable member) 40a are heated by the first heating device 55 (see FIG. 8(c)). At this time, the heating temperature of the preform 10a and the plastic member (outer shrinkable member) 40a may be, for example, 50°C to 100°C.

When the plastic member (outer shrinkable member) 40a is heated, the plastic member (outer shrinkable member) 40a is thermally shrunk and adheres to the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and the plastic member (outer shrinkable member) 40a adhered to the outside of the preform 10a is obtained (see FIG. 8(c)).

After the plastic member 40a is heated and shrunk to adhere to the outside of the preform 10a, the portion of the plastic member 40a protruding from the preform 10a to the bottom side may be thermocompression bonded.

In this manner, the plastic member (outer shrinkable member) 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 (FIGS. 8(a) to (c)) for producing the composite container 10A by blow molding (FIGS. 8(d) to (g)) are performed in separate places (factories, etc. ) can be implemented.

Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 8(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 (outer shrinkable member) 40a in this heating step may be, for example, 90°C to 160°C.

Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 8(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 plastic member (outer shrinkable member) 40 is obtained (see FIGS. 8(e) to 8(g)).

Modification Next, a modification of this embodiment will be described with reference to FIGS. 9(a) to 9(c). The modifications shown in FIGS. 9A to 9C are different in the construction of the light shielding portion 48a and the light transmitting portion 49a, and the rest of the construction is substantially the same as the embodiment described above. In FIGS. 9(a) to 9(c), the same parts as in the embodiment shown in FIGS. 1 to 8 are denoted by the same reference numerals, and detailed description thereof will be omitted.

(Modification 1)
FIG. 9(a) shows a modified example (modified example 1) of the composite preform 70. FIG. In FIG. 9A, the light blocking portion 48a of the plastic member 40a has a narrower width than the translucent portion 49a. That is, the area of the light blocking portion 48a is smaller than the area of the light transmitting portion 49a. In addition, the light shielding portion 48a extends at least partially, preferably over the entire longitudinal direction of the plastic member 40a.

Although not shown, in the composite container 10A obtained by blow-molding the composite preform 70 shown in FIG. 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.

In FIG. 9A, for example, when the light shielding property of the contents is not required, the contents can be visually recognized through the translucent part 49, while the design of the composite container 10A is enhanced by the belt-like light shielding part 48. be able to.

(Modification 2)
FIG. 9(b) shows another modified example (modified example 2) of the composite preform 70. FIG. As shown in FIG. 9B, at least one horizontal section has a plurality of light shielding portions 48a and a plurality of light transmitting portions 49a (four in this case). That is, in the horizontal cross section, the light shielding portions 48a and the light transmitting portions 49a are alternately arranged along the circumferential direction of the plastic member 40a. A plurality of light-transmitting portions 49a are arranged along the longitudinal direction of the plastic member 40a, and are provided in a vertical stripe shape as a whole. In addition, the translucent portion 49a extends over at least a part of the plastic member 40a in the longitudinal direction, preferably over the entire longitudinal direction.

Although not shown, in the composite container 10A obtained by blow-molding the composite preform 70 shown in FIG. They are formed alternately along the circumferential direction. 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.

In FIG. 9B, for example, when the light shielding property of the contents is not required, the contents can be visually recognized through the translucent part 49, while the translucent part 49 and the light shielding part 48 are formed in a vertical striped shape. By doing so, the design of the composite container 10A can be enhanced.

(Modification 3)
FIG. 9C shows another modified example (modified example 3) of the composite preform 70 . As shown in FIG. 9(c), in at least one horizontal section, the light shielding portion 48a and the light transmitting portion 49a are formed along the thickness direction. That is, in the horizontal cross section, the light shielding portion 48a is formed on the outer side in the thickness direction of the plastic member 40a, and the translucent portion 49a is formed on the inner side in the thickness direction. Further, the translucent portion 49a is formed over the entire circumference of the plastic member 40a. On the other hand, the light shielding portion 48a is formed over the entire area of the plastic member 40a except for a portion thereof. A window portion 49b, which is a part of the light transmitting portion 49a, is provided in an area where the light shielding portion 48a is not formed. This window portion 49b is used to check the inside of the composite container 10A, and extends at least partially, preferably over the entire longitudinal direction of the plastic member 40a.

Although not shown, in the composite container 10A obtained by blow-molding the composite preform 70 shown in FIG. formed. 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.

In FIG. 9C, it is possible to visually recognize the contents through the window portion which is a part of the translucent portion 49 while maintaining the light shielding property of the light shielding portion 48 . Further, since the translucent portion 49 is provided over the entire circumferential direction, the function of the translucent portion 49 can be exhibited over the entire circumferential direction of the plastic member 40 . For example, if the translucent portion 49 is made of a material having a higher gas barrier property than the light shielding portion 48, the gas barrier property can be enhanced over the entire circumferential direction of the plastic member 40. FIG.

REFERENCE SIGNS LIST 10 container body 10A composite container 10a preform 11, 11a mouth 12 shoulder 13 neck 14 screw 17 flange 20, 20a body 30, 30a bottom 40, 40a plastic member 41 body 42 bottom 48, 48a light shielding part 49, 49a Translucent portion 70 Composite preform

Claims (9)

In a composite container,
a container body;
A plastic member provided in close contact with the outside of the container body,
The plastic member has a light-shielding portion that blocks visible light and a light-transmitting portion that has an average transmittance of light in the visible light range that is 30% or more higher than that of the light-shielding portion,
Both the light-shielding portion and the light-transmitting portion are formed in at least one horizontal cross-section of the plastic member,
In the horizontal cross section, the light-shielding portion and the light-transmitting portion are formed along the thickness direction, and the light-transmitting portion has a higher gas barrier property than the light-shielding portion. nine,
In the horizontal cross section, the light shielding portion is formed on the outer side in the thickness direction of the plastic member, and the light transmitting portion is formed on the inner side in the thickness direction,
The translucent part is formed over the entire circumferential direction of the plastic member, and the light shielding part is formed over the entire plastic member except for a part. , compound container. 2. The composite container according to claim 1, wherein said translucent portion extends in the longitudinal direction of said plastic member. 3. The composite container according to claim 2, wherein said translucent portion extends over the entire length of said plastic member. In composite preforms for composite containers,
a preform;
a plastic member provided to surround the outside of the preform,
The plastic member is in close contact with the outside of the preform,
The plastic member has a light-shielding portion that blocks visible light and a light-transmitting portion that has an average transmittance of light in the visible light range that is 30% or more higher than that of the light-shielding portion,
Both the light-shielding portion and the light-transmitting portion are formed in at least one horizontal cross-section of the plastic member,
In the horizontal cross section, the light-shielding portion and the light-transmitting portion are formed along the thickness direction, and the light-transmitting portion has a higher gas barrier property than the light-shielding portion. nine,
In the horizontal cross section, the light shielding portion is formed on the outer side in the thickness direction of the plastic member, and the light transmitting portion is formed on the inner side in the thickness direction,
The translucent part is formed over the entire circumferential direction of the plastic member, and the light shielding part is formed over the entire plastic member except for a part. , composite preforms. 5. The composite preform according to claim 4, wherein said translucent portion extends in the longitudinal direction of said plastic member. 6. The composite preform according to claim 5, wherein said translucent portion extends over the entire length of said plastic member. In the method for manufacturing a composite container,
preparing a preform;
providing a plastic member outside the preform;
a step of expanding the preform and the plastic member as one by subjecting the preform and the plastic member to blow molding;
The plastic member has a light-shielding portion that blocks visible light and a light-transmitting portion that has an average transmittance of light in the visible light range that is 30% or more higher than that of the light-shielding portion,
Both the light-shielding portion and the light-transmitting portion are formed in at least one horizontal cross-section of the plastic member,
In the horizontal cross section, the light-shielding portion and the light-transmitting portion are formed along the thickness direction, and the light-transmitting portion has a higher gas barrier property than the light-shielding portion. nine,
In the horizontal cross section, the light shielding portion is formed on the outer side in the thickness direction of the plastic member, and the light transmitting portion is formed on the inner side in the thickness direction,
The translucent part is formed over the entire circumferential direction of the plastic member, and the light shielding part is formed over the entire plastic member except for a part. , a method for manufacturing a composite container. In the method for manufacturing a composite preform,
preparing a preform;
A step of providing a plastic member outside the preform,
The plastic member has a light-shielding portion that blocks visible light and a light-transmitting portion that has an average transmittance of light in the visible light range that is 30% or more higher than that of the light-shielding portion,
Both the light-shielding portion and the light-transmitting portion are formed in at least one horizontal cross-section of the plastic member,
In the horizontal cross section, the light-shielding portion and the light-transmitting portion are formed along the thickness direction, and the light-transmitting portion has a higher gas barrier property than the light-shielding portion. nine,
In the horizontal cross section, the light shielding portion is formed on the outer side in the thickness direction of the plastic member, and the light transmitting portion is formed on the inner side in the thickness direction,
The translucent part is formed over the entire circumferential direction of the plastic member, and the light shielding part is formed over the entire plastic member except for a part. , a method for manufacturing a composite preform. A plastic member mounted so as to surround the outside of the preform,
Having a cylindrical body covering the body of the preform,
The body has a light-shielding portion that blocks visible light and a light-transmitting portion that has an average transmittance of light in the visible light range that is 30% or more higher than that of the light-shielding portion,
Both the light-shielding portion and the light-transmitting portion are formed in at least one horizontal cross-section of the plastic member,
In the horizontal cross section, the light-shielding portion and the light-transmitting portion are formed along the thickness direction, and the light-transmitting portion has a higher gas barrier property than the light-shielding portion. nine,
In the horizontal cross section, the light shielding portion is formed on the outer side in the thickness direction of the plastic member, and the light transmitting portion is formed on the inner side in the thickness direction,
The translucent part is formed over the entire circumferential direction of the plastic member, and the light shielding part is formed over the entire plastic member except for a part. , plastic parts.

Images