JP2019188647A - Production method of composite container, blow molding mold, blow molding transfer sheet, and composite container - Google Patents

Abstract

To provide a production method of a composite container, a blow molding mold, a blow molding transfer sheet, and a composite container, which can readily change an irregular shape of a surface of a plastic member.SOLUTION: A production method of a composite container 10A includes: a step of preparing a preform 10a; a step of providing a plastic member 40a on the outside of the preform 10a; a step of preparing a blow molding mold 50 having a mold body 52 and a transfer sheet 60 adhered to an inner surface of the mold body 52; and a step of expanding the preform 10a and the plastic member 40a as one unit by blow molding the preform 10a and plastic member 40a in the blow molding mold 50. On an exterior surface of the plastic member 40 after the blow molding, a surface shape of the transfer sheet 60 is transferred.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to a method for manufacturing a composite container, a blow mold, a transfer sheet for blow molding, and a composite container.

  Recently, plastic bottles for storing content liquids such as foods and drinks have become common, and such plastic bottles store content liquids.

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

  By the way, in the conventional biaxial stretch blow molding method, for example, a preform including a single layer material such as PET or PP, a multilayer material, a blend material, or the like is used to form a container shape. However, in the conventional biaxial stretch blow molding method, the preform is generally simply formed into a container shape. For this reason, when various functions and characteristics (barrier property, heat retaining property, etc.) are given to the container, the means is limited, for example, by changing the material constituting the preform. In particular, it is difficult to have different functions and characteristics depending on the part of the container (for example, the trunk and the bottom).

  On the other hand, the present applicant has proposed a composite container capable of imparting various functions and characteristics to the container in Patent Document 1.

  Conventionally, when a pattern such as irregularities is to be formed on the surface of a plastic bottle, irregularities are formed on the inner surface of the blow molding mold by machining or the like, and the irregularities on the inner surface of the mold are blown to the surface of the plastic bottle during blow molding Is generally transferred (see, for example, Patent Document 2). For this reason, when it is going to change the uneven | corrugated shape of the surface of a plastic bottle, it is necessary to remanufacture a blow molding die itself, and cost and time are taken.

JP2015-128858A JP 2009-241971 A

  The present disclosure has been made in consideration of such points, and a method for manufacturing a composite container, a blow mold, and a transfer sheet for blow molding that can easily change the uneven shape of the surface of a plastic member. And providing a composite container.

  A method for manufacturing a composite container according to an embodiment includes a step of preparing a preform, a step of providing a plastic member on the outside of the preform, a mold body, and a transfer adhered to the inner surface of the mold body. A step of preparing a blow mold having a sheet, and a step of inflating the preform and the plastic member together by blow molding the preform and the plastic member in the blow mold, The surface shape of the transfer sheet is transferred to the outer surface of the plastic member after blow molding.

  In the method of manufacturing a composite container according to an embodiment, the surface of the transfer sheet may have an uneven shape.

  In the method for manufacturing a composite container according to an embodiment, the surface of the transfer sheet may be mirror-finished.

  In the method of manufacturing a composite container according to an embodiment, the mold body may be a resin mold.

  A blow mold according to an embodiment is a blow mold for producing a composite container having a container body and a plastic member provided in close contact with the outside of the container body, the mold body and the mold A transfer sheet having a surface shape attached to the inner surface of the main body and transferred to the outer surface of the plastic member.

  In the blow mold according to an embodiment, the surface of the transfer sheet may have an uneven shape.

  In the blow mold according to an embodiment, the surface of the transfer sheet may be mirror-finished.

  In the blow mold according to an embodiment, the mold body may be a resin mold.

  The transfer sheet for blow molding according to one embodiment is a transfer sheet for blow molding used 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 an adhesive layer that is adhered to the blow mold, and a transfer layer that is disposed on the adhesive layer and has a shape that is transferred to the outer surface of the plastic member of the composite container.

  In the transfer sheet for blow molding according to an embodiment, the surface of the transfer layer may have an uneven shape.

  In the blow molding transfer sheet according to an embodiment, the surface of the transfer layer may be mirror-finished.

  The transfer sheet for blow molding according to an embodiment may further include a release paper provided on the adhesive layer.

  A composite container according to an embodiment includes a container main body and a plastic member provided in close contact with the outside of the container main body, and is affixed to a blow mold for molding the composite container on the outer surface of the plastic member. The surface shape of the attached transfer sheet is transferred.

  According to the present disclosure, the uneven shape on the surface of the plastic member can be easily changed.

FIG. 1 is a partial vertical sectional view showing a composite container according to an embodiment. FIG. 2 is a horizontal sectional view (sectional view taken along the line II-II in FIG. 1) showing the composite container according to the embodiment. FIG. 3 is a partial vertical sectional view showing a composite preform according to an embodiment. FIG. 4 is a horizontal cross-sectional view (a cross-sectional view taken along line IV-IV in FIG. 3) showing the composite preform according to the embodiment. FIGS. 5A to 5D are perspective views showing various plastic members. 6A to 6F are schematic views illustrating a method for manufacturing a composite container according to an embodiment. 7A to 7F are schematic views showing a method for manufacturing a composite container according to a modification of the embodiment. FIGS. 8A to 8G are schematic views illustrating a method for manufacturing a composite container according to a modification of the embodiment. FIG. 9 is a cross-sectional view illustrating a transfer sheet according to an embodiment. FIG. 10 is a partial vertical sectional view showing a modified example of the composite container.

  Hereinafter, an embodiment will be described with reference to the drawings. 1 to 8 are diagrams showing an embodiment. Each figure shown below is shown schematically. Therefore, the size and shape of each part are exaggerated as appropriate for easy understanding. In addition, the present invention can be implemented with appropriate modifications without departing from the technical idea. Note that, in the drawings shown below, the same portions are denoted by the same reference numerals, and some detailed description may be omitted. In addition, the numerical values such as the dimensions of the respective members and the material names described in the present specification are examples of the embodiment, and are not limited thereto, and can be appropriately selected and used. In this specification, terms specifying the shape and geometric conditions, for example, terms such as parallel, orthogonal, and vertical are intended to include substantially the same state in addition to being strictly meant.

Structure of the composite container First, referring to FIG. 1 and FIG. 2, an outline of the composite container according to the present embodiment. In the present specification, “upper” and “lower” refer to the upper side and the lower side in a state where the composite container 10A is erected (FIG. 1), respectively.

  A composite container 10A shown in FIGS. 1 and 2 is biaxially stretched with respect to a composite preform 70 (see FIG. 4) including a preform 10a and a plastic member 40a using a blow mold 50, as will be described later. By performing the molding, the preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded to be obtained.

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

  Among 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 trunk 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 in close contact with the outer surface of the container main body 10 in a thinly extended state, and is attached to the container main body 10 without being easily moved or rotated.

  Next, the container body 10 will be described in detail. As described above, the container body 10 includes the mouth portion 11, the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30.

  Of these, the mouth portion 11 includes a screw portion 14 screwed into a cap (not shown) and a flange portion 17 provided below the screw portion 14. The shape of the mouth portion 11 may be a conventionally known shape. The container body 10 is filled with contents such as a contents liquid, and a cap (not shown) is screwed into the mouth portion 11 to produce a composite container with 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. The shoulder portion 12 is located between the neck portion 13 and the trunk portion 20, and has a shape in which the diameter gradually increases from the neck portion 13 side toward the trunk portion 20 side (the area gradually increases in the horizontal section). Shape).

  The trunk | drum 20 has a cylindrical shape with a substantially uniform diameter as a whole. However, the present invention is not limited to this, and the body portion 20 may have a polygonal cylindrical shape such as a rectangular cylindrical shape or an octagonal cylindrical shape. Or the trunk | drum 20 may have a cylinder shape with a horizontal cross section which is not uniform toward upper direction from the downward direction. Concavities and convexities other than the transfer region 23 described later, for example, concavities and convexities such as a reduced pressure absorption panel or a groove, may be formed on the outer surface of the body portion 20.

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

  Moreover, the thickness of the container main body 10 in the trunk | drum 20 is not limited to this, For example, it can be made thin about 50 micrometers or more and 250 micrometers or less. Furthermore, the weight of the container body 10 is not limited to this, but can be 10 g or more and 20 g or less. Thus, by reducing the thickness of the container main body 10, the weight of the container main body 10 can be reduced.

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

  The container body 10 can also be formed as a multilayer molded bottle having two or more layers. That is, by injection molding, for example, the intermediate layer is a resin (intermediate layer) having gas barrier properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). Alternatively, a preform 10a having three or more layers may be formed by injection molding and then blow molding to form a multilayer bottle having gas barrier properties. As the intermediate layer, a resin obtained by blending the above-described various resins may be used.

  In addition, by mixing an inert gas (nitrogen gas, argon gas) with the melt of thermoplastic resin, a foam preform having a foam cell diameter of 0.5 μm or more and 100 μm or less is formed, and this foam preform is blow-molded. By doing so, the container body 10 may be produced. Since such a container main body 10 contains the foam cell, the light shielding property of the container main body 10 whole can be improved.

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

  Next, the plastic member 40 will be described. As will be described later, the plastic member 40 (40a) is provided so as to surround the outside of the preform 10a, and is obtained by being in close contact with the outside of the preform 10a and then being biaxially stretch blow-molded 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 bonded, and is in close contact with the container body 10 so as not to move or rotate. The plastic member 40 is thinly extended on the outer surface of the container body 10 to cover the container body 10. 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 trunk portion 20, and the bottom portion 30 except for the mouth portion 11 in the container body 10. Thereby, desired functions and characteristics can be imparted to the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10.

  The plastic member 40 may be provided in the entire region or a partial region other than the mouth portion 11 of the container body 10. For example, the plastic member 40 may be provided so as to cover the entire shoulder portion 12, the trunk portion 20, and the bottom portion 30 except for the mouth portion 11 and the neck portion 13 in the container body 10. Alternatively, the plastic member 40 may be provided so as to cover the shoulder portion 12, the trunk portion 20, and the bottom portion 30 excluding the mouth portion 11, the neck portion 13, and the center portion of the bottom portion 30 in the container body 10.

  Since the plastic member 40 is not welded or bonded 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 blade or the like, or a cutting line (not shown) may be provided in advance on the plastic member 40, and the plastic member 40 may be peeled along the cutting line. it can. Thereby, the plastic member 40 can be separated and removed from the container body 10.

  Such a plastic member 40 may have no contracting action on the preform 10a, or may have a contracting action.

  When the plastic member 40 has an action of contracting with respect to the preform 10a, the plastic member (outside contracting member) 40 is provided outside the preform 10a and is heated integrally with the preform 10a, It is obtained by biaxial stretch blow molding.

  By the way, in the present embodiment, a transfer region 23 is formed on the outer surface of the plastic member 40 located on the body 20. This transfer region 23 is a transfer of the surface shape of a transfer sheet 60 (described later) stuck in a blow mold 50 for molding the composite container 10A. The transfer region 23 has an uneven shape. Such an uneven shape may be a regular or irregular uneven pattern such as a texture. The depth of the uneven pattern (the difference between the most protruding portion and the most recessed portion) may be, for example, 1 μm or more and 500 μm or less. Or as an uneven | corrugated shape, the unevenness | corrugation with fixed outlines, such as a character and a pattern, may be sufficient. The depth of the unevenness having a certain contour (the difference between the most protruding portion and the most recessed portion) may be, for example, 1 μm or more and 500 μm or less. In addition to the uneven shape, the transfer region 23 may be transferred with fine powder such as lame powder attached to the transfer sheet 60 instead of the uneven shape.

  The transfer region 23 may be formed on the entire outer surface of the plastic member 40 located on the body 20 or only on a part of the outer surface. Further, the transfer region 23 is not limited to the 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. In this embodiment, the transfer region 23 has a textured uneven shape (shaded portion in FIG. 1).

  Examples of the plastic member 40 include polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS tree, 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, fluoro rubber, nylon 6, nylon 6,6, aromatic polyamide, polycarbonate , Polyethylene terephthalate, polybutylene terephthalate, ethylene polynaphthalene, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, poly Examples include ether sulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, and epoxy resin. Among these, it is preferable to use thermoplastic inelastic resins such as polyethylene (PE) such as low density polyethylene (LDPE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Moreover, those blend materials, multilayer structures, and partial multilayer structures may be used. Furthermore, various additives other than the main component resin may be added to the material of the plastic member 40 within a range in which the characteristics are not impaired. Examples of additives include plasticizers, UV stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, yarn friction reducing agents, slip agents, mold release agents, An oxidizing agent, an ion exchange agent, a coloring pigment, and the like can be added. Moreover, by mixing an inert gas (nitrogen gas, argon gas) with a thermoplastic resin melt, a foam member having a foam cell diameter of 0.5 μm or more and 100 μm or less is used, and this foam preform is molded. Therefore, the light shielding property can be improved.

  The plastic member 40 may be made of a material having a light barrier property that blocks invisible light such as ultraviolet rays. In this case, the light barrier property of the composite container 10A can be improved and the content liquid can be prevented from being deteriorated by ultraviolet rays or the like without using a multilayer preform or a preform containing a blend material as the preform 10a. As such a material, a blend material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered. Moreover, you may use the foaming member with the foam cell diameter of 0.5 micrometer or more and 100 micrometers or less produced by mixing inert gas (nitrogen gas, argon gas) with the melt of a thermoplastic resin.

  The plastic member 40 may be made of a material having a higher cold insulation property or higher heat retention property (a material having a lower thermal conductivity) than the plastic material constituting the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. Thereby, the cold insulation property or heat retention property of composite container 10A is improved. Further, when the user grips the composite container 10A, it is prevented that the composite container 10A becomes difficult to hold due to being too cold or too hot. Examples of 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 a resin material containing 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. The “average particle size” means the volume average particle size and is measured by a known method using a particle size distribution / particle size distribution measuring device (for example, Nanotrack particle size distribution measuring device, manufactured by Nikkiso Co., Ltd.). can do. The hollow particles may be organic hollow particles composed of a resin or the like, or may be inorganic hollow particles composed of glass or the like. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include styrene resins such as cross-linked styrene-acrylic resins, (meth) acrylic resins such as acrylonitrile-acrylic resins, phenolic resins, fluorine resins, polyamide resins, and polyimides. Resin, polycarbonate resin, polyether resin and the like. In addition, Ropeke HP-1055, Ropeke HP-91, Ropeke OP-84J, Ropeke Ultra, Ropeke SE, Ropeke ST (made by Rohm and Haas Co.), Nipol MH-5055 (made by Nippon Zeon Co., Ltd.), SX8782 Commercially available hollow particles such as SX866 (manufactured by JSR Corporation) can also be used. As content of a hollow particle, it is preferable that it is 0.01 mass part or more and 50 mass parts or less with respect to 100 mass parts of resin materials contained in the plastic member 40, and is 1 mass part or more and 20 mass parts or less. More preferably.

  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 user can easily hold the composite container 10 </ b> A without changing the material of the container body 10.

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

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

Structure of Composite Preform Next , the structure of the composite preform will be described with reference to FIGS.

  As shown in FIGS. 3 and 4, the composite preform 70 includes a preform 10a made of a plastic material, 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. Moreover, the trunk | drum 20a respond | corresponds to the neck part 13, the shoulder part 12, and the trunk | drum 20 of the container main body 10 mentioned above, and has a substantially cylindrical shape. The bottom 30a corresponds to the bottom 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 bonded, and is in close contact with the preform 10a so as not to move or rotate, or in close contact with the preform 10a so as not to fall by its own weight. . The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

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

  The plastic member 40a may be provided in the entire region or a partial region other than the mouth portion 11a. Alternatively, the plastic member 40 a may be provided so as to cover the trunk portion 20 a except the bottom portion 30.

  Such a plastic member 40a may be one that does not have a contracting action on the preform 10a or may have a contracting action.

  In the case where the plastic member (outer contraction member) 40a has an action of contracting, the plastic member (outer contraction member) 40a is applied to the preform 10a when an external action (for example, heat) is applied, for example. What shrinks (for example, heat shrinks) may be used. Alternatively, the plastic member (outer contraction member) 40a itself may be contractible or elastic and can contract without applying an external action.

  When the plastic member 40a has a heat shrinking action, after fitting the cylindrical plastic member 40a into the preform 10a, the lower end of the plastic member 40a (the end opposite to the mouth portion 11a) The blank portion formed in the above may be thermocompression bonded.

  Examples of the plastic member 40a include a direct blow tube produced by direct blow molding, a sheet molded tube produced by sheet molding, an extrusion tube produced by extrusion molding, an injection molded tube produced by injection molding, and inflation molding. An inflation molded tube or the like produced by the above can be used, but is not limited to this, and a molding method other than the 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. 5A, the plastic member 40 a has a bottomed cylindrical shape as a whole, and may have a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41. . In this case, since the bottom part 42 of the plastic member 40a covers the bottom part 30a of the preform 10a, various functions and characteristics such as barrier properties are imparted to the bottom part 30 in addition to the trunk part 20 of the composite container 10A. Can do. Examples of such a plastic member 40a include the direct blow tube, sheet molded tube, and injection molded tube described above.

  Further, as shown in FIG. 5B, the plastic member 40 a has a circular tube shape (bottomless cylindrical shape) as a whole and may have a cylindrical body portion 41. 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.

  Moreover, as shown in FIG.5 (c) and FIG.5 (d), the plastic members 40a may be produced by forming a film into a cylinder shape and bonding the edge part together. In this case, as shown in FIG.5 (c), the plastic members 40a may be comprised by the pipe shape (bottomless cylindrical shape) which has the trunk | drum 41, and as shown in FIG.5 (d), The bottom 42 may be bonded to form a bottomed cylinder.

The method of manufacturing a composite preform and the composite container now to FIG 6 (a) ~ (f), a method for manufacturing a composite container 10A according to this embodiment (blow molding process).

  First, a preform 10a made of a plastic material is prepared (see FIG. 6A). In this case, for example, the preform 10a may be manufactured by an injection molding method using an unillustrated injection molding machine. Moreover, you may use the preform generally used conventionally as the preform 10a.

  Next, by providing a plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is produced (FIG. 6 ( b)). In this case, the plastic member 40 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41.

  At this time, a plastic member 40a having an inner diameter that is the same as or slightly smaller than the outer diameter of the preform 10a may be pressed into the preform 10a to be brought into close contact with 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 thermally contracted by heating to 50 ° C. to 100 ° C. You may make it stick to.

  In this way, a series of steps for producing the composite preform 70 by previously bringing the plastic member 40a into close contact with the outside of the preform 10a and producing the composite preform 70 (FIGS. 6A to 6B). )) And a series of steps (FIGS. 6C to 6F) for producing the composite container 10A by blow molding can be performed at different places (factories, etc.).

  Next, the composite preform 70 is heated by the heating device 51 (see FIG. 6C). At this time, the composite preform 70 is evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow mold 50 for producing the composite container 10A (see FIG. 6D).

  The composite container 10 </ b> A is molded using the blow mold 50. In this case, the blow mold 50 includes a mold body 52 that is a metal mold or a resin mold, and a transfer sheet 60 that is attached to the inner surface of the mold body 52. In the present embodiment, a blow molding die 50 having such a die body 52 and a transfer sheet 60 is also provided.

  The mold body 52 includes a pair of body molds 50a and 50b and a bottom mold 50c that are divided from each other (see FIG. 6D). The inner surface of the mold main body 52 has a shape corresponding to the shoulder portion 12, the neck portion 13, the trunk portion 20, and the bottom portion 30 of the composite container 10 </ b> A. In FIG. 6 (d), the pair of body molds 50a and 50b are open to each other, and the bottom mold 50c is raised upward. In this state, the composite preform 70 is inserted between the pair of body molds 50 a and 50 b of the mold body 52.

  The transfer sheet 60 is attached to the inner surfaces of the pair of body part molds 50a and 50b, and is provided at a position corresponding to the transfer region 23 described above. The surface of the transfer sheet 60 has an uneven shape as described above.

  Next, as shown in FIG. 6E, after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the pair of body molds 50a and 50b and the bottom mold of the mold body 52 are closed. A blow molding die 50 sealed by the die 50c is configured. Next, air is press-fitted into the preform 10 a and biaxial stretch blow molding is performed on the composite preform 70.

  Thus, the composite preform 70 is shaped into a shape corresponding to the inner surface of the blow mold 50, and the container body 10 is obtained from the preform 10 a in the blow mold 50. During this time, the body molds 50a and 50b are heated to 30 ° C. to 80 ° C., and the bottom mold 50c is cooled to 5 ° C. to 25 ° C. In the blow mold 50, the uneven shape on the surface of the transfer sheet 60 is transferred to the plastic member 40 of the composite container 10 </ b> A, and the transfer region has the unevenness on the outer surface of the plastic member 40 located on the body portion 20. 23 is formed. At this time, in the blow mold 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded as a unit. Thus, the preform 10a and the plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow mold 50. As the composite container 10A is stretched, the transfer sheet 60 is pressed against the inner surface of the mold body 52 along the normal direction of the surface. For this reason, the position of the transfer sheet 60 is difficult to shift during blow molding.

  In this manner, a 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.

  Thereafter, as shown in FIG. 6 (f), the pair of body molds 50 a and 50 b and the bottom mold 50 c of the mold body 52 are separated from each other, and the composite container 10 </ b> A is taken out from the blow mold 50. At this time, the transfer sheet 60 is separated from the composite container 10 </ b> A and continues to remain on the inner surface of the mold body 52. In this way, the composite container 10A shown in FIGS. 1 and 2 is obtained.

Modified Example of Manufacturing Method of Composite Container Next, a modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 7 (a) to 7 (f) has a function in which a plastic member (outer contraction member) 40a contracts with respect to the preform 10a, and other configurations are shown in FIG. 6 (a). It is substantially the same as the form shown in (f). 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 made of a plastic material is prepared (see FIG. 7A).

  Next, a plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 7B). In this case, the plastic member (outer contraction member) 40 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body 41 and a bottom 42 connected to the body 41. The plastic member (outer contraction member) 40 is mounted so as to cover the entire region of the trunk portion 20a and the bottom portion 30a.

  Next, the preform 10a and the plastic member (outer contraction member) 40a are heated by the heating device 51 (see FIG. 7C). At this time, the preform 10a and the plastic member (outer contraction member) 40a are evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member (outer contraction member) 40a in this heating step may be, for example, 90 ° C. to 130 ° C.

  In this way, the plastic member (outer contraction member) 40a is heated, so that the plastic member (outer contraction member) 40a is thermally contracted and is in close contact with the outside of the preform 10a (see FIG. 7C). . When the plastic member (outer contraction member) 40a itself has contractibility, the plastic member at the time when the plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 7B). (Outer contraction member) 40a may be in close contact with the outside of the preform 10a.

  Subsequently, the preform 10a and the plastic member (outer contraction member) 40a heated by the heating device 51 are sent to the blow mold 50 (see FIG. 7D).

  The preform 10a and the plastic member (outer contraction member) 40a are molded using this blow molding die 50, and substantially the same as in the case of FIGS. 6 (a) to (f) described above, A composite container 10A including a plastic member (outer contraction member) 40 provided on the outer surface of the container body 10 is obtained (see FIGS. 7D to 7F). During this time, in the blow mold 50, the uneven shape on the surface of the transfer sheet 60 is transferred to the plastic member 40 of the composite container 10A. As a result, a transfer region 23 having irregularities is formed on the outer surface of the plastic member 40 located on the body 20.

  Next, with reference to FIGS. 8A to 8G, another modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described. The modified example shown in FIGS. 8A to 8G has an effect that the plastic member (outer contraction member) 40a contracts with respect to the preform 10a, and the preform 10a and the plastic member (outer contraction member) 40a. Is heated in two stages, and the other configuration is substantially the same as the configuration shown 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 made of a plastic material is prepared (see FIG. 8A).

  Next, a plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 8B).

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

  By heating the plastic member (outer contraction member) 40a, the plastic member (outer contraction member) 40a is thermally contracted, and is in close contact with the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and a plastic member (outer contraction member) 40a in close contact with the outside of the preform 10a is obtained (see FIG. 8C). In this case, after the cylindrical plastic member 40a is fitted into the preform 10a, the blank portion formed at the lower end (the end opposite to the mouth portion 11a) of the plastic member 40a is subjected to thermocompression bonding. Also good. This thermocompression bonding can be performed by heating the blank portion with infrared rays, warm air, or the like, and then sandwiching the lower end portion of the plastic member 40a in a horizontal direction with a pair of crimping tools (not shown). Thereby, the opening formed in the cylindrical lower end part of the plastic member 40a is closed, and the lower end part can be thermocompression bonded.

  In this way, the composite preform 70 is manufactured by preliminarily bringing the plastic member (outer contraction member) 40a into heat contact with the outside of the preform 10a using the first heating device 55, thereby producing the composite preform 70. And a series of steps (FIGS. 8D to 8G) for producing the composite container 10A by blow molding at different locations (factory etc.) ) Can be implemented.

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

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow mold 50 (see FIG. 8E). In this case, the heating for shrinking the plastic member (outer contraction member) 40a and the heating for blow-molding the preform 10a can be performed in the same process.

  The composite preform 70 is formed using the blow mold 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 above-described FIGS. A composite container 10A including a plastic member (outer contraction member) 40 is obtained (see FIGS. 8E to 8G). During this time, in the blow mold 50, the uneven shape on the surface of the transfer sheet 60 is transferred to the plastic member 40 of the composite container 10 </ b> A, and the transfer region has the unevenness on the outer surface of the plastic member 40 located in the body portion 20. 23 is formed.

Next , the configuration of the transfer sheet according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 9, the transfer sheet 60 for blow molding according to the present embodiment is disposed on the mold body 52 of the blow mold 50 and the adhesive layer 61, and is disposed on the adhesive layer 61. And a transfer layer 62 having a shape transferred to the outer surface of the container 10A.

  The adhesive layer 61 may contain an adhesive. The pressure-sensitive adhesive is not particularly limited. For example, natural rubber-based resins, butyl rubber, polyisoprene, polyisobutylene, polychloroprene, styrene-butadiene copolymer resins and other synthetic rubber resins, silicone resins, acrylic resins Resin, vinyl acetate resin such as polyvinyl acetate and ethylene-vinyl acetate copolymer, urethane resin, acrylonitrile, hydrocarbon resin, alkylphenol resin, rosin, rosin triglyceride, hydrogenated rosin and other rosin resins are applicable. The thickness of the sticking layer 61 is good also as the range of 5 micrometers or more and 300 micrometers or less, for example.

  The sticking layer 61 can be peeled off from the mold main body 52, and can be peeled off manually or mechanically. Even if the sticking layer 61 remains in the mold main body 52, water can be removed. It can be removed by cleaning with alcohol. By removing the adhesive layer 61, the mold body 52 can be returned to the state before the transfer sheet 60 is applied. In this case, another transfer sheet 60 can be attached to the mold body 52 again.

As the transfer layer 62, for example, vinyl chloride sheet or the like made from vinyl chloride resins, it is preferable to use a material excellent in weather resistance and heat resistance. The thickness of the transfer layer 62 may be, for example, in the range of 10 μm to 3000 μm, and may be 10 μm to 100 μm in order to keep the bottle shape.

  The surface of the transfer layer 62 has an uneven shape. As such a concavo-convex shape, for example, a regular or irregular concavo-convex pattern such as a texture, or a concavo-convex having a constant contour such as a character or a pattern may be used. Further, a glossy fine powder such as lame powder may adhere to the surface of the transfer layer 62.

  A release paper 63 is provided on the adhesive layer 61. The release paper 63 is detachably attached to the opposite side of the transfer layer 62 on the adhesive layer 61. The transfer sheet 62 is directed to the inner surface of the mold main body 52 by peeling the release paper 63 from the adhesive layer 61 and attaching the adhesive layer 61 to the outer surface of the mold main body 52. By performing blow molding in this state, the uneven shape of the transfer layer 62 is transferred to the outer surface of the composite container 10A.

  The release paper 63 includes a base material such as high-quality paper, coated paper, impregnated paper, or a plastic film, and a release layer provided on one side of the base material. The release layer is not particularly limited as long as it is a material having releasability, and examples thereof include silicone resins, organic resin-modified silicone resins, fluorine resins, aminoalkyd resins, and polyester resins. These resins can be used in any of emulsion type, solvent type and solventless type.

  As described above, according to the present embodiment, blow molding is performed using the blow molding die 50 having the mold main body 52 and the transfer sheet 60 adhered to the inner surface of the mold main body 52, and the composite container 10A. Is made. At this time, the surface shape of the transfer sheet 60 attached to the mold body 52 is transferred to the outer surface of the plastic member 40. Thereby, the transfer region 23 having an uneven shape can be easily formed on the surface of the composite container 10A. Further, the transfer sheet 60 attached to the mold body 52 can be easily peeled and replaced with another transfer sheet 60. For this reason, the uneven | corrugated shape of the surface of 10 A of composite containers can be changed easily and in a short time. In this case, since it is not necessary to remanufacture the mold body 52 itself, costs and time required for manufacturing the mold body 52 can be reduced. Furthermore, since the transfer sheet 60 can be attached to the existing mold body 52, various desired uneven shapes are imparted to the surface of the composite container 10A while maintaining the overall shape of the existing mold body 52. can do.

  Further, according to the present embodiment, since the surface of the transfer sheet 60 has an uneven shape, the uneven shape of the transfer sheet 60 is transferred to the surface of the composite container 10A, and the composite container 10A having the uneven shape is easily produced. be able to.

  Moreover, according to this Embodiment, it is possible to use the material (for example, polyethylene and polypropylene) whose shapeability is better than the material (for example, polyethylene terephthalate) of the container main body 10 as the plastic member 40. For this reason, compared with the case where the surface shape of the transfer sheet 60 is directly transferred to the container body 10, the surface shape of the transfer sheet 60 can be clearly transferred to the plastic member 40. Thereby, the surface shape (for example, uneven | corrugated shape) of the transfer area | region 23 can be formed more finely.

  In addition, according to the present embodiment, the plastic member 40 can be separated and removed from the container main body 10, so that the colorless and transparent container main body 10 can be recycled as in the conventional case.

(Modification of composite container)
Next, a modified example of the composite container will be described.

  In the above embodiment, the case where the transfer region 23 has an uneven shape has been described as an example. However, the present invention is not limited to this, and as shown in FIG. 10, the transfer region 23 may be formed in a mirror shape by transferring the surface of the mirror-finished transfer sheet 60. The surface roughness of the mirror surface may be, for example, Ra (arithmetic average roughness) 1.0 or less. The transfer sheet 60 is a sheet having a transfer layer whose surface is mirror finished, such as a gloss sheet. In this case, since the mirror-finished surface shape of the transfer sheet 60 is transferred to the surface of the composite container 10A, the mirror-shaped transfer region 23 can be easily formed on the surface of the composite container 10A. In particular, when the mold body 52 is made of, for example, a resin mold used for trial purposes, it is difficult to polish the surface of the resin mold, and the surface of the composite container 10A tends to be rough. On the other hand, the surface of the composite container 10A is mirror-like even when a resin mold is used by sticking the mirror-finished transfer sheet 60 to the inner surface of the mold body 52 and performing blow molding. It becomes possible to form.

  Moreover, in the said embodiment, it demonstrated taking the case where the transfer sheet 60 was affixed on the inner surface of the type | mold main body 52 as an example. However, the present invention is not limited to this, and another transfer sheet may be attached onto the transfer sheet 60 attached to the inner surface of the mold body 52. That is, the transfer sheet 60 may be provided in multiple layers on the inner surface of the mold body 52. In this case, the other transfer sheet preferably has a smaller area than the transfer sheet 60. Accordingly, various types of shapes can be transferred to the surface of the composite container 10A by appropriately replacing another transfer sheet.

  It is also possible to appropriately combine a plurality of constituent elements disclosed in the embodiment and the modification examples as necessary. Or you may delete a some component from all the components shown by the said embodiment and modification.

DESCRIPTION OF SYMBOLS 10 Container main body 10A Composite container 10a Preform 11, 11a Mouth part 12 Shoulder part 13 Neck part 14 Screw part 17 Flange part 20, 20a Body part 23 Transfer area 30, 30a Bottom part 40, 40a Plastic member 50 Blow molding die 52 Type main body 60 Transfer Sheet 61 Adhesive Layer 62 Transfer Layer 63 Release Paper 70 Composite Preform

Claims (13)

In the manufacturing method of the composite container,
Preparing a preform;
Providing a plastic member on the outside of the preform;
Preparing a blow mold having a mold body and a transfer sheet adhered to the inner surface of the mold body;
Expanding the preform and the plastic member integrally by blow-molding the preform and the plastic member in the blow mold,
A method for manufacturing a composite container, wherein a surface shape of the transfer sheet is transferred to an outer surface of the plastic member after blow molding.   The method of manufacturing a composite container according to claim 1, wherein a surface of the transfer sheet has an uneven shape.   The method of manufacturing a composite container according to claim 1, wherein a surface of the transfer sheet is mirror-finished.   The method of manufacturing a composite container according to any one of claims 1 to 3, wherein the mold body is a resin mold. A blow mold for producing a composite container having a container body and a plastic member provided in close contact with the outside of the container body,
A mold body;
A blow molding die comprising: a transfer sheet having a surface shape attached to an inner surface of the mold body and transferred to an outer surface of the plastic member.   The blow molding die according to claim 5, wherein a surface of the transfer sheet has an uneven shape.   The blow molding die according to claim 5, wherein a surface of the transfer sheet is mirror-finished.   The blow mold according to any one of claims 5 to 7, wherein the mold body is a resin mold. A blow molding transfer sheet used when producing a composite container having a container body and a plastic member provided in close contact with the outside of the container body,
An adhesive layer attached to a blow mold,
A transfer sheet for blow molding, comprising: a transfer layer disposed on the adhesive layer and having a shape transferred to an outer surface of the plastic member of the composite container.   The blow molding transfer sheet according to claim 9, wherein a surface of the transfer layer has an uneven shape.   The blow molding transfer sheet according to claim 9, wherein a surface of the transfer layer is mirror-finished.   The transfer sheet for blow molding according to any one of claims 9 to 11, further comprising a release paper provided on the adhesive layer. In composite containers,
A container body;
A plastic member provided in close contact with the outside of the container body,
A composite container in which a surface shape of a transfer sheet adhered to a blow mold for forming a composite container is transferred to an outer surface of the plastic member.