TWI774975B - Composite container, method for producing composite container, and blow molding die - Google Patents

Abstract

The composite container (10A) of the present invention includes a container body (10) and a plastic member (40) provided in close contact with the outer side of the container body (10). On the outer surface of the plastic member (40), a structural color display part (23) including a fine concavo-convex shape and showing a structural color is arranged.

Description

Composite container, method for producing composite container, and blow molding die

The present invention relates to a composite container, a method for manufacturing the composite container, and a blow molding die.

Recently, a plastic bottle has become common as a bottle for accommodating a content liquid such as food and drink, and the content liquid is accommodated in such a plastic bottle.

A plastic bottle for containing such a content liquid is manufactured by inserting a preform into a mold and performing biaxial stretch blow molding.

Also, in the previous biaxial stretch blow molding method, a single-layer material, a multi-layer material, or a blended material including, for example, PET (polyethylene terephthalate) or PP (polypropylene) is used. and other preforms to be formed into the shape of a container. However, in the prior biaxial stretch blow molding method, only the preform is generally formed into the shape of the container. Therefore, when the container has various functions or properties (barrier property, heat preservation property, etc.), the method is limited, for example, the material constituting the preform needs to be changed. It is particularly difficult to have different functions or properties depending on the location of the container, such as the main body or the bottom.

In view of this, in Patent Document 1, the present applicant discloses a composite container capable of imparting various functions or properties to the container.

[Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-128858

On the other hand, when producing such a composite container, it is required to make the appearance of the composite container more favorable and to improve the designability.

The present invention has been made in consideration of this aspect, and an object of the present invention is to provide a composite container and a method for producing a composite container capable of improving the appearance of the composite container and improving the designability.

The composite container of one embodiment includes a container body and a plastic member provided in close contact with the outer side of the container body, and a structural color display portion having a fine concavo-convex shape and showing a structural color is provided on the outer surface of the plastic member.

In the composite container of one embodiment, the above-mentioned structural color display portion may also exhibit a structural color due to a diffraction grating.

In the composite container of one embodiment, the distance between the fine concavo-convex shapes may be 0.8 μm or more and 3.0 μm or less.

In the composite container of one embodiment, the fine concavo-convex shape of the structural color display portion may be a shape transferred from the surface shape of a blow mold for molding the composite container.

In the composite container of one embodiment, the fine concavo-convex shape of the structural color display portion may be a shape transferred from a transfer sheet attached to a blow molding die for molding the composite container.

A method of manufacturing a composite container according to one embodiment includes: a step of preparing a preform; a step of arranging a plastic member on the outer side of the preform; a step of preparing a blow molding mold; The plastic component is blow-molded in the blow molding die, and the preform and the plastic component are integrally expanded; and in the step of integrally expanding the preform and the plastic component, turning The surface shape of the above-mentioned blow molding die is printed, and a structural color display portion including a fine concavo-convex shape and showing a structural color is formed on the outer surface of the above-mentioned plastic member after blow molding.

A method of manufacturing a composite container according to an embodiment includes: a step of preparing a preform; a step of arranging a plastic member on the outer side of the preform; a step of preparing a blow molding die to which the transfer sheet is attached; The preform and the plastic component are blow-molded in the blow molding die, so that the preform and the plastic component are integrally expanded; and the preform and the plastic component are made to expand. In the step of integral expansion, the surface shape of the transfer sheet attached to the blow molding die is transferred by transfer, and the outer surface of the plastic member after blow molding is formed into a structure color display including fine concavo-convex shapes and showing a structure color department.

The blow molding die of one embodiment is for producing a composite container having a container body and a plastic member provided in close contact with the outer side of the container body, and has a surface shape portion for forming the outer surface of the plastic member A structural color display portion including a fine concavo-convex shape and exhibiting a structural color is formed.

A blow molding die of one embodiment is for producing a composite container having a container body and a plastic member provided in close contact with the outside of the container body, and includes: a die body; and a transfer sheet attached to the die The inner surface of the main body has a surface shape for forming a structure color display portion including a fine concavo-convex shape and showing a structure color on the outer surface of the plastic member.

According to this invention, the external appearance of a composite container can be made favorable, and designability can be improved.

10: Container body

10a: Preforms

10A: Composite container

11: Mouth

11a: Mouth

12: Shoulder

13: Neck

14: Threaded part

17: Flange part

20: Main body

20a: Main body

23: Structure color display part

30: Bottom

30a: Bottom

31: Recess

32: Ground

40: Plastic components

40a: Plastic components

41: main body

42: Bottom

50: Blow molding die

50a, 50b: a pair of main body molds

50c: Bottom mold

51: Heating device

52: Mold body

53: Surface Shape Department

60: Transfer sheet

61: Lamination layer

62: transfer layer

63: Release paper

64: Surface Shape Department

70: Composite Preform

H: height

P: Pitch

Fig. 1 is a partial vertical sectional view showing a composite container according to an embodiment.

FIG. 2 is a horizontal cross-sectional view (cross-sectional view taken along line II-II of FIG. 1 ) showing a composite container according to an embodiment.

FIG. 3 is a schematic view showing the fine concavo-convex shape of the structural color display portion of the composite container according to the embodiment.

Fig. 4 is a partial vertical cross-sectional view showing a composite preform according to an embodiment.

FIG. 5 is a horizontal cross-sectional view (a cross-sectional view taken along the line V-V of FIG. 4 ) of a composite preform according to an embodiment.

Figures 6(a) to (d) are perspective views showing various plastic components.

Figures 7(a) to (f) show the manufacture of a composite container using a blow molding die of one embodiment Schematic diagram of the method.

Fig. 8 is a cross-sectional view showing a transfer sheet of a blow molding die according to a modified example of the embodiment.

FIGS. 9( a ) to ( c ) are schematic diagrams showing a method for producing a composite container using a blow molding die of a modification of one embodiment.

Hereinafter, an embodiment will be described with reference to the drawings. 1 to 7 are diagrams showing an embodiment. The figures shown below are schematic representations. Therefore, the size and shape of each part are appropriately exaggerated for easy understanding. In addition, it can be implemented by making suitable changes within the range which does not deviate from the technical idea. In addition, in each figure shown below, the same code|symbol is attached|subjected to the same part, and a part of detailed description may be abbreviate|omitted. In addition, the numerical values, such as the dimension of each member, and material name described in this specification are an example of embodiment, It is not limited to this, It can select and use suitably. In this specification, the terms which specify a shape or a geometrical condition, such as parallelism, orthogonality, perpendicularity, etc., also include substantially the same state unless it means strictly.

The composition of the composite container

First, the outline of the composite container of the present embodiment will be described with reference to FIGS. 1 and 2 . In addition, in this specification, "upper" and "lower" mean the upper side and the lower side of the state (FIG. 1) which made the composite container 10A stand upright, respectively.

The composite container 10A shown in FIGS. 1 and 2 is obtained by using a blow molding die 50 to form a composite preform 70 including the preform 10a and the plastic member 40a (refer to 4 and 5) biaxial stretch blow molding is performed, so that the preform of the composite preform 70 is 10a and the plastic member 40a are integrally expanded.

Such a composite container 10A includes a container body 10 made of a plastic material on the inner side, and a plastic member 40 provided in close contact with the outer side of the container body 10 .

The container body 10 includes a mouth portion 11 , a neck portion 13 disposed below the mouth portion 11 , a shoulder portion 12 disposed below the neck portion 13 , a body portion 20 disposed below the shoulder portion 12 , and a body portion 20 disposed below the main body portion 20 . the bottom 30.

On the other hand, the plastic member 40 is attached to the outer surface of the container body 10 in a thinly extended state, and is installed in a manner that cannot be easily moved or rotated relative to the container body 10 .

Next, the container 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 main body portion 20 , and the bottom portion 30 as described above.

The mouth portion 11 has a threaded portion 14 screwed to a cap not shown, and a flange portion 17 disposed below the threaded portion 14 . Furthermore, the shape of the mouth portion 11 may be a previously known shape. The container body 10 is filled with contents such as the content liquid, and a cap (not shown) is screwed to the mouth portion 11 , thereby producing a composite container containing the contents.

The neck portion 13 is located between the flange portion 17 and the shoulder portion 12, and has a substantially cylindrical shape having a substantially uniform diameter. In addition, the shoulder portion 12 is located between the neck portion 13 and the main body portion 20, and has a shape in which the diameter gradually expands from the neck portion 13 side toward the main body portion 20 side (a shape in which the area gradually expands in a horizontal cross-section). shape).

The main body portion 20 has a cylindrical shape having a substantially uniform diameter as a whole. However, it is not limited to this, and the main body portion 20 may have a polygonal cylindrical shape such as a quadrangular cylindrical shape or an octagonal cylindrical shape. Alternatively, the main body portion 20 may have a cylindrical shape having an uneven horizontal cross-section from above to below. On the outer surface of the main body portion 20 , irregularities other than the structural color display portion 23 described below, for example, irregularities such as a decompression absorption panel or a groove, may be formed.

On the other hand, the bottom portion 30 has a concave portion 31 located in the center, and a ground portion 32 provided around the concave portion 31 . Furthermore, the shape of the bottom portion 30 is not particularly limited, and may have a previously known bottom shape (eg, petal bottom shape, round bottom shape, etc.).

In addition, the thickness of the container main body 10 in the main body part 20 is not limited to this, For example, it can be as thin as about 50 micrometers or more and 250 micrometers or less. Furthermore, the weight of the container main body 10 is not limited to this, and can be set to 10 g or more and 20 g or less. By reducing the 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 injection molding a synthetic resin material to produce a preform 10a (described below), and performing biaxial stretch blow molding on the preform 10a. Furthermore, as the material of the container body 10, thermoplastic resins, especially PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), and PEN (polyethylene naphthalate) are preferably used. diester), PC (polycarbonate). The container body 10 can also be colored in colors such as red, blue, yellow, green, brown, black, white, etc., but when considering the ease of reuse, it is preferably Colorless and transparent. Moreover, the above-mentioned various resins can also be mixed and used. Furthermore, in order to improve the barrier property of the container, a vapor-deposited film such as a diamond-like carbon film or a silicon oxide film can also be formed on the inner surface of the container body 10 .

In addition, the container body 10 may be formed as a multilayer molded bottle of two or more layers. That is, injection molding can also be used, for example, the intermediate layer can be made of MXD6 (poly-meta-xylylene adipamide, polymetaxylylenediamine), MXD6+ fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene- A resin (intermediate layer) having gas barrier properties, such as vinyl alcohol copolymer) or PEN (polyethylene naphthalate), is formed by injection molding the preform 10a including three or more layers, and then blow molding to form It is a multi-layer bottle with gas barrier properties. Furthermore, as the intermediate layer, resins in which the above-mentioned various resins are blended can also be used.

In addition, the container body 10 can also be produced by mixing an inert gas (nitrogen, argon) into a melt of thermoplastic resin so as to have a foam cell diameter of 0.5 μm or more and 100 μm or less. The foam preform is formed, and the foam preform is blow-molded. The container body 10 has foamed cells inside, so the light-shielding property of the entire container body 10 can be improved.

Such a container body 10 may include, for example, a bottle with a filling capacity of 100 ml or more and 2000 ml or less. Alternatively, the container body 10 may be a large bottle having a filling capacity of, for example, 10L or more and 60L or less.

Next, the plastic member 40 will be described. The plastic member 40 ( 40a ) is disposed so as to surround the outer side of the preform 10a as described later, and is obtained by attaching After the outer side of the preform 10a, it is subjected to biaxial stretch blow molding together with the preform 10a.

The plastic component 40 is installed without being attached to the outer surface of the container body 10 , and is closely connected to the container body 10 to the extent that it does not move or rotate. The plastic component 40 is thinly extended from the outer surface of the container body 10 to cover the container body 10 . Also, as shown in FIG. 2 , the plastic member 40 is disposed in the entire circumferential direction of the container body 10 to surround the container body 10 , and has a substantially circular horizontal cross-section.

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

Furthermore, the plastic member 40 can also be disposed on the whole area or a part of the area of the container body 10 except for the mouth portion 11 . For example, the plastic member 40 may also be disposed in a manner of covering the entire body 12 of the container body 10 except the mouth 11 and the neck 13 , the shoulder 12 , the main body 20 and the bottom 30 . Alternatively, the plastic member 40 may also be provided in a manner of covering the shoulder 12 , the main body 20 and the bottom 30 of the container body 10 , except for the mouth 11 , the neck 13 and the central portion of the bottom 30 .

Since the plastic component 40 is not welded or adhered to the container body 10 , it can be peeled off and removed from the container body 10 . Specifically, the plastic member 40 can be cut off using a knife, or the plastic member 40 can be peeled off along the cutting line by setting an unillustrated cutting line on the plastic member 40 in advance. Thereby, the plastic component 40 can be separated and removed from the container body 10 .

The plastic member 40 of this type may be one that does not have the function of shrinking with respect to the preform 10a, or may have the function of shrinking.

When the plastic member 40 has the function of shrinking relative to the preform 10a, the plastic member (outside shrinking member) 40 is obtained by the following method, that is, it is arranged on the outside of the preform 10a, and is connected with the preform 10a. The molded body 10a is integrally heated and subjected to biaxial stretch blow molding.

In addition, in this embodiment, the structural color display part 23 (shaded part in FIG. 1 ) which has a fine concavo-convex shape and exhibits a structural color is provided on the outer surface of the plastic member 40 . The fine concavo-convex shape of the structural color display portion 23 is a shape transferred from the surface shape of the blow molding die 50 for molding the composite container 10A. By displaying the structural color by the structural color display unit 23 , various colors can be viewed according to the angle from which the composite container 10A is viewed. Therefore, the designability of the composite container 10A can be improved. In addition, in the case of coloring the plastic member 40, or when forming a display portion including pearl color or the like from the plastic member 40, a pigment or dye is generally kneaded into the resin material. On the other hand, in the present embodiment, the structural color display portion 23 including the fine concavo-convex shape and showing the structural color is provided on the outer surface of the plastic member 40 . Therefore, since the ink deteriorated by ultraviolet rays or the like is not used, the design property can be maintained for a long period of time compared to the case where printing is performed on the outer surface of the plastic member 40, for example. Furthermore, in the composite container 10A of the present embodiment, the plastic member 40 is separated and removed from the container body 10, and the colorless and transparent container body 10 may be reused. On the other hand, in the present embodiment, the structural color can be displayed by the structural color display portion 23 without adding pigments or dyes to the plastic member 40 , so that the reusability of the container body 10 can be improved. In addition, in this specification, the so-called "structural color" refers to a color developed by optical phenomena based on physical structure, such as diffraction, refraction, interference, or scattering of light caused by a fine structure, and is not a special pigment.

The structural color display portion 23 of the present embodiment exhibits structural colors due to the diffraction grating. Since the structural color display portion 23 displays the structural color due to the diffraction grating, it is difficult to produce an imitation product, so that the reliability of the product can be improved, and the aesthetics of the composite container 10A can be improved. The fine concavo-convex shape of the structure color display portion 23 may be a regular concavo-convex pattern having a periodic structure, or an irregular concavo-convex pattern that changes continuously. In the example shown in FIG. 3 , the fine concavo-convex shape has a wave-shaped concavo-convex pattern having a periodic structure. The pitch P between the fine concavo-convex shapes (the space between adjacent concave portions) can be set to, for example, 0.8 μm or more and 3.0 μm or less. By setting the pitch P between the fine concavo-convex shapes to 0.8 μm or more, the formability during blow molding can be improved, and high diffraction efficiency can be exhibited for a specific wavelength in the visible light range. In addition, by setting the height H of the fine concavo-convex shape to 3.0 μm or less, the structural color display portion 23 can effectively express the structural color and can exhibit high diffraction efficiency with respect to a specific wavelength in the visible light range. In addition, the height H of the fine concavo-convex shape (difference between the most protruding part and the most concave part) may be, for example, 0.5 μm or more and 10 μm or less. By setting the height H of the fine concavo-convex shape to be 0.5 μm or more, the formability at the time of blow molding can be improved. In addition, by setting the height H of the fine concavo-convex shape to 10 μm or less, the structural color display portion 23 can effectively express the structural color. Furthermore, the concave-convex pattern of the fine concave-convex shape is optional, and may be, for example, a zigzag shape or a rectangular shape.

The structural color display portion 23 may also be formed on the entire outer surface or only a part of the outer surface of the plastic member 40 located in the main body portion 20 . In addition, the structural color display portion 23 is not limited to the main body portion 20 , and may be formed on a part or the whole of the plastic member 40 located on the shoulder portion 12 , the neck portion 13 , and/or the bottom portion 30 .

Examples of the plastic member 40 include polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS (acrylonitrile) -styrene, acrylonitrile-styrene) resin, ABS (acrylonitrile-butadiene-styrene, acrylonitrile-butadiene-styrene) 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, polyacrylonitrile Amine, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6. Nylon 6,6, aromatic polyamide, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, U polymer, liquid crystal polymer , modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysiloxane, polyphenylene sulfide, polyether silt, polysiloxane, polyamine Formate, phenolic resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin, etc. Among them, thermoplastics such as polyethylene (PE) such as low density polyethylene (LDPE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN) are preferably used Inelastic resin. In addition, it can also be a blended material, a multi-layer structure, or a partial multi-layer structure. Furthermore, in the material of the plastic member 40 , various additives may be added in addition to the resin of the main component within a range that does not impair its characteristics. As additives, for example, plasticizers, ultraviolet stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, line friction reducing agents, luster agents, mold release agents, Antioxidants, ion exchangers, and coloring pigments, etc. In addition, by mixing an inert gas (nitrogen, argon) into the melt of the thermoplastic resin, and using a foamed member having a foamed cell diameter of 0.5 μm or more and 100 μm or less, the foamed preform is formed, thereby This improves light-shielding properties.

The plastic member 40 may also include a material having light blocking properties that block invisible light such as ultraviolet rays. In this case, a multilayer preform or a preform containing a blended material or the like may not be used as the preform 10a, thereby improving the light barrier properties of the composite container 10A and preventing the deterioration of the content liquid due to ultraviolet rays or the like. As such a material, a blend material, or a material in which a light-shielding resin is added to PET, PE, or PP can be considered. In addition, a foamed member having a foamed cell diameter of 0.5 μm or more and 100 μm or less produced by mixing an inert gas (nitrogen, argon) into a thermoplastic resin melt can also be used.

The plastic component 40 may also include a material with higher cold or heat preservation properties (material with lower thermal conductivity) than the plastic material constituting the container body 10 (preform 10a). In this case, the thickness of the container body 10 itself can not be thickened, so that the temperature of the content liquid is not easily transferred to the surface of the composite container 10A. Thereby, the cold-retaining property or the heat-retaining property of the composite container 10A is improved. Moreover, when a user holds the composite container 10A, it is prevented that it becomes difficult to hold the composite container 10A due to excessive cooling or overheating. As such materials, foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenolic resin, polyvinyl chloride, urea resin, polysiloxane, poly Imide, melamine resin, etc. It is preferable to mix a hollow particle with the resin material which consists of these resins. The average particle diameter of the hollow particles is preferably 1 μm or more and 200 μm or less, and more preferably 5 μm or more and 80 μm or less. In addition, the so-called "average particle size" means the volume average particle size, and can be measured by a known method using a particle size distribution and particle size distribution measuring apparatus (for example, Nanotrac particle size distribution measuring apparatus, manufactured by Nikkiso Co., Ltd., etc.). Determination. Moreover, as a hollow particle, the organic type hollow particle containing resin etc. may be sufficient, and the inorganic type hollow particle containing glass etc. may be sufficient, but organic type hollow particle is preferable from the point which is excellent in dispersibility. As the resin constituting the organic hollow particles, for example, Examples include styrene-based resins such as cross-linked styrene-acrylic resins, (meth)acrylic-based resins such as acrylonitrile-acrylic resins, phenol-based resins, fluorine-based resins, polyamide-based resins, polyimide-based resins, Polycarbonate resin, polyether resin, etc. Also, ROPAQUE HP-1055, ROPAQUE HP-91, ROPAQUE OP-84J, ROPAQUE ULTRA, ROPAQUE SE, ROPAQUE ST (manufactured by Rohm and Haas Co., Ltd.), Nepal MH-5055 (manufactured by Zeon Co., Ltd., Japan) can also be used ), SX8782, SX866 (manufactured by JSR Corporation) and other commercially available hollow particles. The content of the hollow particles is preferably 0.01 part 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, relative to 100 parts by mass of the resin material contained in the plastic member 40 .

In addition, the plastic member 40 may also include a material that is more difficult to slide than the plastic material constituting the container body 10 (preform 10a). In this case, the material of the container body 10 does not need to be changed, so that the user can easily hold the composite container 10A.

The plastic member 40 may also be colored in colors such as red, blue, yellow, green, brown, black, and white, and may be transparent or opaque.

In addition, the thickness of the plastic member 40 is not limited to this, For example, it can be about 5 micrometers or more and 500 micrometers or less in the state attached to the container main body 10.

Composition of Composite Preforms

Next, the structure of the composite preform will be described with reference to FIGS. 4 and 5 .

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

The preform 10a includes a mouth portion 11a, a main body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the main body portion 20a. Among them, the mouth portion 11a corresponds to the mouth portion 11 of the container body 10 and has substantially the same shape as the mouth portion 11 . Moreover, the main-body part 20a corresponds to the neck part 13, the shoulder part 12, and the main-body part 20 of the said container main body 10, and has a substantially cylindrical shape. The bottom 30a corresponds to the bottom 30 of the container body 10 and has a substantially hemispherical shape.

The plastic member 40a is not attached to the outer surface of the preform 10a, and is closely connected to the extent that it does not move or rotate relative to the preform 10a, or is closely attached to the extent that it does not drop due to its own weight. The plastic component 40a is disposed in the entire area in the circumferential direction so as to surround the preform 10a, and has a circular horizontal cross-section.

In this case, the plastic member 40a is provided so as to cover the entire area of the container body 10 in the main body portion 20a and the entire area of the bottom portion 30a.

Furthermore, the plastic member 40a may be provided in the whole area or a part of the area except the mouth portion 11a. Alternatively, the plastic member 40a may also be provided so as to cover the main body portion 20a other than the bottom portion 30 .

As such a plastic member 40a, it may be one that does not have a function of shrinking with respect to the preform 10a, or one that has a function of shrinking.

In the case where the plastic member 40a has the function of shrinking, the plastic member (outside shrinking member) 40a can also be used, for example, to shrink relative to the preform 10a (such as heat shrinking) when an external action (such as heat) is applied. )By. Alternatively, the plastic member (outside shrinking member) 40a may also have shrinkage or elasticity, and can shrink when no external action is applied.

Furthermore, when the plastic member 40a has a heat shrinking effect, after the cylindrical plastic member 40a is embedded in the preform 10a, the plastic member 40a formed on the lower end (and the mouth) The remaining portion of the end portion on the opposite side of 11a) is thermocompressed.

As the plastic member 40a, for example, a direct blow molding tube produced by direct blow molding, a sheet metal forming tube produced by sheet metal molding, an extruded tube produced by extrusion molding, and an injection molding method can be used. The injection-molded tube produced, the inflation-molded tube produced by inflation molding, etc., are not limited to these, and molding methods other than those described above may be used.

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

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

As shown in FIG. 6( a ), the plastic member 40 a may include a bottomed cylindrical shape as a whole, having a cylindrical main body portion 41 and a bottom portion 42 connected to the main body portion 41 . In this case, the bottom portion 42 of the plastic member 40a covers the bottom portion 30a of the preform 10a, so not only can The body portion 20 and the bottom portion 30 may also be provided with various functions or properties such as barrier properties. As such a plastic member 40a, for example, the above-mentioned direct blow molding tube, sheet metal forming tube, and injection molding tube can be mentioned.

Moreover, as shown in FIG.6(b), the plastic-made member 40a may comprise the circular tube shape (bottomless cylindrical shape) as a whole, and may have the cylindrical main-body part 41. As shown in FIG. In this case, as the plastic member 40a, for example, the above-mentioned blow-molded tube, extrusion tube, inflation-molded tube, and sheet-formed tube can be used.

Moreover, as shown in FIG.6(c) and FIG.6(d), the plastic-made member 40a can also be manufactured by forming a film into a cylindrical shape, and bonding the edge part. In this case, as shown in FIG. 6( c ), the plastic member 40 a can also be configured to have a tube shape (bottomless cylindrical shape) with the main body 41 , as shown in FIG. 6( d ), or by The bottom portion 42 is bonded together to form a bottomed cylindrical shape.

Composite preform and composite container manufacturing method

Next, the manufacturing method (blow molding method) of the composite container 10A of this embodiment is demonstrated using FIG.7(a)-(f).

First, a preform 10a made of a plastic material is prepared (see Fig. 7(a) ). In this case, the preform 10a can be produced by the injection molding method using, for example, an injection molding machine not shown. In addition, it is also possible to use a preform generally used in the past as the preform 10a.

Next, by disposing the plastic member 40a on the outer side of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outer side of the preform 10a is fabricated (see FIG. 7(b). )). In this case, the plastic component 40a has a bottomed cylindrical shape as a whole, with a circular shape. A cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41 .

At this time, the plastic member 40a having the same or slightly smaller inner diameter than the outer diameter of the preform 10a can be pressed into the preform 10a so as to be in close contact with the preform 10a outer surface. Alternatively, as described later, a heat-shrinkable plastic member 40a may be disposed on the outer surface of the preform 10a, and the plastic member 40a may be heat-shrinked by heating the plastic member 40a to 50°C to 100°C. , so that it is closely attached to the outer surface of the preform 10a.

In this way, the composite preform 70 can be pre-fabricated by making the plastic member 40a close to the outside of the preform 10a in advance, and a series of steps of producing the composite preform 70 (FIG. 7(a)-(b)), A series of steps ( FIGS. 7( c ) to ( f )) for producing the composite container 10A by blow molding are carried out in different places (factories, etc.).

Next, the composite preform 70 is heated by the heating device 51 (see FIG. 7( c )). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic component 40a in the heating step can be set to, for example, 90°C to 130°C.

Also, the blow molding die 50 is prepared. Then, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 for producing the composite container 10A (refer to FIG. 7( d )).

The composite container 10A is formed using the blow molding die 50 . In this case, the blow molding die 50 is equipped to form a shape including fine concavo-convex on the outer surface of the plastic member 40 and present a The structural color of the structural color indicates the surface shape portion 53 of the structural color display portion 23 (shaded portions in FIGS. 7( d ) to (f )). In the present embodiment, the blow mold 50 includes a mold body 52 serving as a metal mold or a resin mold, and a surface shape portion 53 is provided on the inner surface of the mold body 52 at a position corresponding to the structural color display portion 23 . The surface shape portion 53 has a concavo-convex pattern corresponding to the fine concavo-convex shape of the structural color display portion 23 . In this embodiment, the blow molding die 50 provided with such a surface shape part 53 is also provided.

The mold main body 52 includes a pair of main body molds 50a, 50b and a bottom mold 50c (refer to FIG. 7(d) ) which are separated from each other. The inner surface of the mold body 52 has a shape corresponding to the shoulder portion 12 , the neck portion 13 , the main body portion 20 and the bottom portion 30 of the composite container 10A. In FIG.7(d), a pair of main-body part mold|type 50a, 50b is mutually opened, and the bottom mold|type 50c rises upward. In this state, the composite preform 70 is inserted between the pair of main body molds 50 a and 50 b of the mold body 52 .

Next, as shown in FIG. 7(e), after the bottom mold 50c is lowered, the pair of main body molds 50a, 50b are closed, thereby forming a blower sealed by a pair of main body molds 50a, 50b and the bottom mold 50c by one of the mold bodies 52 A mold 50 is molded. Next, air is pressed into the preform 10a, and the composite preform 70 is subjected to biaxial stretch blow molding.

Thereby, the composite preform 70 is shaped into a shape corresponding to the inner surface of the blow molding die 50 , and the container body 10 is obtained from the preform 10 a in the blow molding die 50 . During this period, the main body molds 50a and 50b are heated to 30°C to 80°C, and the bottom mold 50c is cooled to 5°C to 25°C. In addition, in the blow-molding mold 50, the surface shape of the blow-molding mold 50 (the mold body 52) is transferred, so that the outer surface of the plastic member 40 after blow-molding is formed with a fine concave-convex shape and a structural color. The structural color display portion 23 is constructed. At this time, in the blow molding die 50, the preform of the composite preform 70 is The molded body 10a and the plastic member 40a are integrally expanded. Thereby, the preform 10 a and the plastic member 40 a are integrated and shaped into a shape corresponding to the inner surface of the blow mold 50 .

Thereby, the composite container 10A including the container body 10 and the plastic member 40 provided on the outer surface of the container body 10 is obtained.

Then, as shown in FIG. 7( f ), the pair of main body molds 50 a and 50 b and the bottom mold 50 c are separated from each other, and the composite container 10A is taken out from the blow molding mold 50 . Thereby, the composite container 10A shown in FIGS. 1 and 2 is obtained.

As described above, according to the present embodiment, the structural color display portion 23 including the fine concavo-convex shape and showing the structural color is provided on the outer surface of the plastic member 40 . Thereby, various colors can be visually recognized according to the angle from which the composite container 10A is visually recognized. Therefore, the designability of the composite container 10A can be improved. Moreover, since the ink deteriorated by ultraviolet rays etc. is not used, compared with the case where printing is performed on the outer surface of the plastic member 40, for example, the design property can be maintained for a long period of time.

Moreover, according to this embodiment, the composite container 10A is produced by performing blow molding using the blow molding die 50 . At this time, the surface shape of the mold body 52 is transferred to the outer surface of the plastic member 40 . Thereby, the structural color display part 23 which has a fine uneven|corrugated shape can be formed easily on the surface of the composite container 10A.

Moreover, according to this embodiment, since the plastic member 40 can be separated and removed from the container body 10, the colorless and transparent container body 10 can be reused in the same manner as before.

Furthermore, according to the present embodiment, a material (eg, polyethylene or polypropylene) with better formability than the material of the container body 10 (eg, polyethylene terephthalate) can be used as the plastic member 40 . Therefore, compared with the case where the surface shape of the mold body 52 is directly transferred to the container body 10 , the surface shape of the mold body 52 can be definitely transferred to the plastic member 40 . Thereby, finer (for example, 3 μm or less) concavo-convex shapes can be displayed on the surface of the plastic member 40 .

Furthermore, in the above-mentioned embodiment, the case where the fine concavo-convex shape of the structural color display portion 23 is a shape transferred from the surface shape portion 53 provided on the inner surface of the mold body 52 is described as an example. However, it is not limited to this, and the fine concavo-convex shape of the structural color display portion 23 may be a shape transferred from the transfer sheet 60 attached to the blow molding die 50 for molding the composite container 10A.

In this modification, the blow molding mold 50 is further provided with a transfer sheet 60 , which is attached to the inner surface of the mold body 52 , and has a micro-concave-convex shape and a structural color on the outer surface of the plastic member 40 . The surface shape of the color display portion 23 is configured. As shown in FIG. 8 , the transfer sheet 60 for blow molding includes a bonding layer 61 that is bonded to the mold body 52 of the blow molding mold 50 , and a bonding layer 61 that is disposed on the bonding layer 61 and that is transferred to a composite container. The transfer layer 62 in the shape of the outer surface of 10A.

The adhesive layer 61 may also include an adhesive. The adhesive is not particularly limited, and for example, synthetic rubber-based resins such as natural rubber-based, butyl rubber, polyisoprene, polyisobutylene, polychloroprene, and styrene-butadiene copolymer resins are applicable. , polysiloxane-based resins, acrylic resins, polyvinyl acetate, ethylene-vinyl acetate copolymers and other vinyl acetate-based resins, urethane-based resins, acrylonitrile, hydrocarbon resins, alkanol resins, rosin, Rosin Triglycerides, Rosin-based resins such as hydrogenated rosin. The thickness of the bonding layer 61 can be set in the range of 5 micrometers or more and 300 micrometers or less, for example.

The adhesive layer 61 can be peeled off from the mold body 52, and can be peeled off by manual operation or mechanical operation. Even if the adhesive layer 61 remains on the mold body 52, it can also be removed by cleaning with water or alcohol. . By removing the bonding layer 61 , the mold body 52 can be returned to the state before the transfer sheet 60 was attached. In this case, other transfer sheets 60 can also be attached to the mold body 52 again.

As the transfer layer 62, it is preferable to use a material excellent in weather resistance and heat resistance, such as vinyl chloride paper made from vinyl chloride resin. The thickness of the transfer layer 62 can be, for example, in the range of 10 μm or more and 3000 μm or less, and when the bottle shape is to be further maintained, it can be 10 μm or more and 100 μm or less.

In addition, a surface shape portion 64 for forming the structural color display portion 23 having a fine concavo-convex shape and showing a structural color on the outer surface of the plastic member 40 is provided on the surface of the transfer layer 62 . The configuration of the surface shape portion 64 is the same as that of the surface shape portion 53 of the mold body 52 described above, and thus detailed description is omitted here.

Moreover, the release paper 63 is provided on the bonding layer 61 . The release paper 63 is releasably attached to the opposite side of the transfer layer 62 on the adhesive layer 61 . By peeling the release paper 63 from the adhesive layer 61 , the adhesive layer 61 is attached to the outer surface of the mold body 52 so that the transfer layer 62 faces the inner surface of the mold body 52 . By performing blow molding in this state, the fine concavo-convex shape of the transfer layer 62 is transferred to the outer surface of the composite container 10A.

The release paper 63 has a base material such as Dowling paper, coated paper, impregnated paper, or plastic film, and a release layer provided on one side of the base material. The mold release layer is not particularly limited as long as it is a material having mold release properties, and examples thereof include polysiloxane resin, organic resin-modified polysiloxane resin, fluorine resin, aminoalkyd resin, polyester resin, and the like. These resins may use any of emulsion type, solvent type or solvent-free type.

Next, the manufacturing method of the composite container 10A of this modification is demonstrated with reference to Fig.9 (a)-(c).

First, for example, by the method shown in FIGS. 7( a )-( c ), a plastic member 40 a is provided on the outer side of the preform 10 a and heated by the heating device 51 .

Next, the preform 10a and the plastic member 40a heated by the heating device 51 are sent to the blow molding die 50 (refer to FIG. 9(a)).

The preform 10a and the plastic member 40a are formed using the blow molding die 50, and the container body 10 and the container body 10 provided in the container are obtained in substantially the same manner as in the case of FIGS. 7(d) to (f) above. The composite container 10A of the plastic member 40 on the outer surface of the main body 10 (refer to FIGS. 9( a )-( c )). At this time, the transfer sheets 60 are respectively attached to the inner surfaces of the pair of main body part molds 50a and 50b, and are provided at positions corresponding to the above-mentioned structural color display parts 23 . Thereby, in the blow molding die 50, the surface shape of the transfer sheet 60 is transferred, so that the structure color display portion 23 including the fine concavo-convex shape and showing the structure color is formed on the outer surface of the plastic member 40 after blow molding. .

As described above, according to this modification, the fine concavo-convex shape of the structural color display portion 23 is a shape transferred from the transfer sheet 60 attached to the blow molding die 50 for molding the composite container 10A. In this case, by transferring the surface shape of the transfer sheet 60 attached to the mold body 52 to the outer surface of the plastic member 40 , a structure having a fine concave-convex shape can be easily formed on the surface of the composite container 10A. color display unit 23 . In addition, the transfer sheet 60 attached to the mold body 52 can be easily peeled off and replaced with another transfer sheet 60 . Therefore, the fine concavo-convex shape of the surface of the composite container 10A can be changed easily and in a short time. In this case, there is no need to remanufacture the mold body 52 itself, so that the cost and time required for the manufacture of the mold body 52 can be saved. In addition, since the transfer sheet 60 can be attached to the existing mold body 52, the overall shape of the existing mold body 52 can be maintained, and various desired fine concavo-convex shapes can be imparted to the surface of the composite container 10A.

A plurality of constituent elements disclosed in the above-mentioned embodiments and modifications may be appropriately combined as required. Alternatively, some constituent elements may be deleted from all the constituent elements shown in the above-mentioned embodiments and modifications.

10: Container body

10A: Composite container

11: Mouth

12: Shoulder

13: Neck

14: Threaded part

17: Flange part

20: Main body

23: Structure color display part

30: Bottom

31: Recess

32: Ground

40: Plastic components

Claims (9)

A composite container comprising: a container body; and a plastic member, which is provided in close contact with the outer side of the container body; and a structural color display portion including a fine concavo-convex shape and showing a structural color is provided on the outer surface of the plastic member ; The above-mentioned fine concavo-convex shape is a continuously changing irregular concave-convex pattern. The composite container of claim 1, wherein the above-mentioned structural color display portion exhibits a structural color caused by a diffraction grating. The composite container according to claim 1, wherein the distance between the fine concavo-convex shapes is 0.8 μm or more and 3.0 μm or less. The composite container according to claim 1, wherein the fine concavo-convex shape of the structural color display portion is a shape transferred from the surface shape of a blow molding die for forming the composite container. The composite container according to claim 1, wherein the fine concavo-convex shape of the structural color display portion is a shape transferred from a transfer sheet attached to a blow mold for molding the composite container. A method for manufacturing a composite container, comprising: the step of preparing a preform; A step of disposing a plastic member on the outer side of the preform; a step of preparing a blow-molding mold; and by blow-molding the preform and the plastic member in the blow-molding mold, the above The step of integrally expanding the preform and the plastic component; and in the step of integrally expanding the preform and the plastic component, transferring the surface shape of the blow molding mold, and the plastic after blow molding The outer surface of the manufacturing member is formed with a structural color display portion including a fine concavo-convex shape and showing a structural color; and the above-mentioned fine concavo-convex shape is a continuously changing irregular concavo-convex pattern. A method for manufacturing a composite container, comprising: the steps of preparing a preform; the step of arranging a plastic component on the outside of the preform; the step of preparing a blow molding die to which a transfer sheet is attached; The above-mentioned preform and the above-mentioned plastic component are blow-molded in the above-mentioned blow-molding mold, and the step of integrally expanding the above-mentioned preform and the above-mentioned plastic component; In the expansion step, the surface shape of the transfer sheet attached to the blow molding die is transferred by transfer, and a structural color display portion containing fine concavo-convex shapes and showing a structural color is formed on the outer surface of the plastic member after blow molding. and the above-mentioned fine concave-convex shape is a continuously changing irregular concave-convex pattern. A blow molding die for producing a composite container having a container body and a plastic member closely attached to the outside of the container body, and having a surface shape portion for forming on the outer surface of the plastic member contains fine The concavo-convex shape and the structural color display part exhibiting the structural color; the above-mentioned fine concavo-convex shape is an irregular concavo-convex pattern that changes continuously. A blow molding die for producing a composite container having a container body and a plastic component closely attached to the outside of the container body, and comprising: a die body; and a transfer sheet attached to the die body The inner surface has a surface shape for forming a structural color display portion including a fine concavo-convex shape and showing a structural color on the outer surface of the plastic member; the fine concavo-convex shape is a continuously changing irregular concavo-convex pattern.

Images