JP6663577B2 - Composite preform and its manufacturing method, intermediate, and composite container and its manufacturing method - Google Patents

Description

  The present invention relates to a composite preform and a method for producing the same, an intermediate, and a composite container and a method for producing the same.

  Recently, plastic bottles for storing content liquids such as food and drink have become popular, and such plastic bottles store the content liquid.

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

  By the way, in the conventional biaxial stretch blow molding method, for example, a preform containing a single layer material such as PET or PP, a multilayer material, a blend material, or the like is used to mold the container into a container shape. However, in the conventional biaxial stretch blow molding method, it is common to simply mold the preform into a container shape. For this reason, when giving various functions and characteristics (barrier property, heat insulation property, etc.) to the container, the means for changing the material of the preform is limited, for example.

JP 2009-241526 A

  The present invention has been made in view of the above points, and a composite preform and a method for producing the same, which are capable of producing a high quality composite container having various functions and characteristics such as gas barrier properties. , An intermediate, and a composite container and a method for producing the same.

  The present invention provides a method for manufacturing a composite preform, comprising: a step of preparing a preform made of a plastic material having a mouth, a body, and a bottom, and a gate formed on the bottom, and A step of providing a plastic member, and a step of forming a gate housing portion for covering the gate in the plastic member while causing the plastic member to adhere to the outside of the preform by contracting the plastic member. A step of integrally cutting the gate of the preform and the gate accommodating portion of the plastic member.

  The present invention is the method for producing a composite preform, wherein the height of the gate is 0.1 mm to 15 mm.

  The present invention is the method for producing a composite preform, wherein a gate mark protrusion is formed by cutting the gate, and the height of the gate mark protrusion is 0.1 mm to 5 mm.

  The present invention provides an intermediate for producing a composite preform, which has a mouth, a trunk, and a bottom, and a preform made of a plastic material in which a gate is formed on the bottom, so as to surround the outside of the preform. A plastic member having a bottom formed with a gate housing portion that covers the gate in a state in which the plastic member is in close contact with the gate of the preform, and the plastic member is in close contact with the outside of the preform. It is an intermediate characterized by being carried out.

  The present invention is an intermediate, wherein the height of the gate is 0.1 mm to 15 mm.

  The present invention provides, in a composite preform, a preform made of a plastic material having a mouth, a body, and a bottom, and a gate mark protrusion formed on the bottom, and provided so as to surround the outside of the preform. A plastic member having an opening for accommodating the gate trace protrusion of the preform, and a plastic member, the plastic member being in close contact with the outside of the preform, and a lower surface of the plastic member. A composite preform characterized in that the lower surface of the gate trace projection is located on the same plane.

  The present invention is the composite preform, wherein the height of the gate mark protrusion is 0.1 mm to 5 mm.

  The present invention provides a method for manufacturing a composite container, comprising: a step of preparing a preform made of a plastic material having a mouth, a body, and a bottom, and a gate formed on the bottom; Providing a plastic member, and shrinking the plastic member so that the plastic member is in close contact with the outside of the preform, and forming a gate accommodating portion that covers the gate in the plastic member. A step of integrally cutting the gate of the preform and the gate accommodating portion of the plastic member, and performing blow molding on the preform and the plastic member to form the preform and the plastic member. And a step of expanding the member made integrally. Vessels is a method of manufacturing.

  The present invention is a composite container produced by the method for producing a composite container.

  ADVANTAGE OF THE INVENTION According to this invention, since the gate of a preform and the gate accommodating part of a plastic member are cut | disconnected integrally, in the composite container after blow molding, the dispersion | variation in the shape around the bottom part of a container main body can be reduced. . Thereby, a composite container provided with various functions and characteristics such as gas barrier properties can be manufactured with high quality.

FIG. 1 is a partial vertical sectional view showing a composite container according to a first embodiment of the present invention. FIG. 2 is a horizontal cross-sectional view (cross-sectional view taken along the line II-II in FIG. 1) showing the composite container according to the first embodiment of the present invention. FIG. 3 is a partial vertical sectional view showing the composite preform according to the first embodiment of the present invention. FIGS. 4A to 4D are schematic diagrams illustrating a method for manufacturing a composite preform according to the first embodiment of the present invention. FIGS. 5A to 5D are schematic diagrams illustrating a method for manufacturing a composite container according to the first embodiment of the present invention. FIG. 6 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 7 is a horizontal sectional view (sectional view taken along line VII-VII of FIG. 6) showing the composite container according to the second embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a composite preform according to a second embodiment of the present invention. FIGS. 9A to 9D are schematic diagrams illustrating a method for manufacturing a composite preform according to a second embodiment of the present invention. FIGS. 10A to 10D are schematic diagrams illustrating a method for manufacturing a composite container according to the second embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 to 5 are views showing a first embodiment of the present invention.

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

  The composite container 10A shown in FIGS. 1 and 2 is biaxially stretched to a composite preform 70 (see FIG. 3) including a preform 10a and a plastic member 40a by using a blow mold 50 as described later. This is obtained by expanding the preform 10a of the composite preform 70 and the plastic member 40a integrally by performing blow molding.

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

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

  On the other hand, the plastic member 40 is closely attached to the outer surface of the container main body 10 in a state of being thinly extended, 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. The container body 10 has the mouth 11, the neck 13, the shoulder 12, the trunk 20, and the bottom 30 as described above.

  The opening 11 has a screw portion 14 screwed to a cap (not shown) and a flange portion 17 provided below the screw portion 14. Note that the shape of the mouth portion 11 may be a conventionally known shape.

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

  Further, the body 20 has a cylindrical shape having a substantially uniform diameter as a whole. However, the present invention is not limited to this, and the body 20 may have a polygonal cylindrical shape such as a rectangular cylindrical shape or an octagonal cylindrical shape. Alternatively, the body 20 may have a tubular shape having a horizontal cross section that is not uniform from above to below. Further, in the present embodiment, the body portion 20 has no substantially uneven surface and a substantially flat surface, but is not limited thereto. For example, unevenness such as a panel or a groove may be formed on the body 20.

  On the other hand, the bottom portion 30 has a concave portion 31 located at the center and a ground 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).

  The thickness of the container body 10 in the body 20 is not limited to this, but can be reduced to, for example, about 50 μm to 250 μm (50 μm or more and 250 μm or less; the same applies hereinafter). Further, the weight of the container body 10 is not limited to this, but can be 10 g to 20 g. 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 manufactured by biaxially stretch blow molding a preform 10a (described later) manufactured by injection molding a synthetic resin material. As a material of the preform 10a, that is, a material of the container body 10, a thermoplastic resin, particularly, PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate) may be used. preferable. The container body 10 may be colored in a color such as red, blue, yellow, green, brown, black, or white, but is preferably colorless and transparent in consideration of ease of recycling. Further, the various resins described above may be blended and used. Further, a vapor-deposited film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the container body 10 in order to enhance the barrier properties of the container.

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

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

  Such a container body 10 may be composed of, for example, a bottle having a full filling capacity of 100 ml to 2000 ml. Alternatively, the container body 10 may be a large bottle having a full filling capacity of, for example, 10 L to 60 L.

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

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

  In this case, the plastic member 40 is provided so as to cover the shoulder 12, the trunk 20, and the bottom 30 of the container main body 10 except for the mouth 11, the neck 13, and the center of the bottom 30. Thereby, desired functions and characteristics can be given to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10. In FIG. 1, the plastic member 40 has an opening 44 corresponding to the center of the bottom 30. The opening 44 corresponds to an opening 44a for accommodating a gate mark protrusion 34a described later. However, such an opening 44 does not necessarily have to be provided. For example, the bottom portion 30 may be completely covered by the plastic member 40 by closing the opening 44a after blow molding.

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

  On the other hand, since the plastic member 40 is not welded or adhered to the container body 10, it can be removed from the container body 10 and removed. Specifically, for example, the plastic member 40 is cut off using a cutting tool or the like, or a cutting line (not shown) is provided in advance on the plastic member 40, and the plastic member 40 is peeled off along the cutting line. it can. Thereby, the plastic member 40 can be separated and removed from the container body 10.

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

  In the present embodiment, the plastic member 40 may be colored in a visible light color such as red, blue, yellow, green, brown, black, and white. Further, the plastic member 40 may be (semi) transparent or opaque. In this case, for example, the plastic member 40 may be colored in visible light and the container body 10 may be colorless and transparent. Alternatively, both the container body 10 and the plastic member 40 may be colored in visible light. In the case where the plastic member 40 colored in the visible light color is produced, a visible light color pigment may be added to the molding material in the step of producing the plastic member 40a before blow molding by injection molding or the like. .

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

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

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

  A substantially cylindrical gate mark protrusion 34a is formed at the center (lower end) of the bottom 30a. The gate trace protrusion 34a is an unnecessary portion remaining on the bottom 30a when the preform 10a is manufactured by, for example, an injection molding method, and corresponds to the resin in the gate of the injection molding die. The gate trace projection 34a is formed by cutting the gate 35 of the preform 10a together with the gate accommodating portion 42a of the plastic member 40a, as described later. Therefore, the lower surface 40c of the plastic member 40a and the lower surface 34b of the gate trace projection 34a are substantially flat, and are located on the same plane (cut surface).

  The height (length along the axial direction of the preform 10a) h of the gate mark protrusion 34a is, for example, about 0.1 mm to 5 mm, and the width (diameter) d of the gate mark protrusion 34a is, for example, about 3 mm to 12 mm. . In this specification, the width of the gate trace protrusion 34a refers to the length of the longest part of the gate trace protrusion 34a when the gate trace protrusion 34a is viewed from the bottom surface direction.

  The plastic member 40a is attached to the outer surface of the preform 10a without being adhered thereto, and is adhered to the preform 10a so as not to move or rotate, or to such an extent that it does not drop 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 area of the body 20a except for the portion 13a corresponding to the neck 13 of the container body 10 and the entire area of the bottom 30a except for the lower surface 34b of the gate mark projection 34a. Have been. Further, the plastic member 40a may be colored with visible light such as red, blue, yellow, green, brown, black, and white.

  The plastic member 40a may be provided in the whole area or a part of the area except for the opening 11a and the lower surface 34b of the gate trace projection 34a. For example, the plastic member 40a may be provided so as to cover the whole of the neck portion 13a, the trunk portion 20a, and the bottom portion 30a except for the opening 11a and the lower surface 34b of the gate trace projection 34a. Further, the number of the plastic member 40a is not limited to one, and a plurality of plastic members may be provided. For example, two plastic members 40a may be provided outside the body 20a and outside the bottom 30a, respectively.

  As shown in FIG. 3, the plastic member 40 a has a substantially cylindrical shape with a bottom as a whole, and has a cylindrical body 41 and a substantially hemispherical bottom 42 connected to the body 41. . In this case, since the bottom portion 42 of the plastic member 40a covers almost the entire area of the bottom portion 30a of the preform 10a (excluding the opening 44a described later), in addition to the body portion 20 of the composite container 10A, Various functions and characteristics such as gas barrier properties can be provided.

  An opening 44a for accommodating the gate mark protrusion 34a of the preform 10a is provided at the center of the bottom 42 of the plastic member 40a. The opening 44a is formed through the bottom 42 of the plastic member 40a, and is in close contact with the gate trace projection 34a so as to cover the periphery of the gate trace projection 34a. As a result, there is no gap between the bottom portion 42 of the plastic member 40a and the bottom portion 30a of the preform 10a, so that air remains between the container body 10 and the plastic member 40 after blow molding, so that gas barrier properties are reduced. And the like can be prevented from being impaired.

  The diameter of the opening 44a is substantially equal to the outer diameter d of the gate trace protrusion 34a described above, and is, for example, about 3 mm to 12 mm. The opening 44a is provided at one location in the center of the bottom portion 42, but the position and the number are not limited to this. The shape of the opening 44a is circular when viewed from the bottom direction (downward in FIG. 3), but may be any shape as long as it corresponds to the shape of the gate trace protrusion 34a, and may be rectangular, elliptical, or rounded rectangular. Shape, rhombus shape, triangular shape, pentagonal shape, arrow blade shape, hexagonal shape, and the like. The depth of the opening 44a is substantially the same as the height h of the gate trace projection 34a, for example, about 0.1 mm to 5 mm.

  As described above, by providing the opening 44a for accommodating the gate mark protrusion 34a in the bottom 42 of the plastic member 40a, no gap is formed between the bottom 42 of the plastic member 40a and the bottom 30a of the preform 10a. . Thereby, it is possible to prevent a problem that functions such as gas barrier properties are impaired due to air remaining between the container body 10 and the plastic member 40 after blow molding.

  As such a plastic member 40a, a member having an action of contracting with respect to the preform 10a is used. In this case, as the plastic member (outside contraction member) 40a, for example, a member that contracts (for example, heat contracts) to the preform 10a when an external action (for example, heat) is applied may be used. . Alternatively, the plastic member (outside contraction member) 40a may itself be contractible or elastic, and may be contractable without adding an external action.

  As the plastic member 40a, for example, polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, Polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluorine resin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, Ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluoro rubber, nylon 6, nylon 6,6, nylon MXD6, aromatic polyamide , Polycarbonate, ethylene polyterephthalate, polybutylene terephthalate, ethylene polynaphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene Examples thereof include sulfide, polyether sulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, and epoxy resin. Among them, it is preferable to use a thermoplastic inelastic resin such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). Further, a blend material, a multilayer structure, or a partial multilayer structure thereof may be used. Further, various additives other than the main component resin may be added to the material of the plastic member 40a as long as the properties are not impaired. Examples of additives include a plasticizer, an ultraviolet stabilizer, a coloring inhibitor, a matting agent, a deodorant, a flame retardant, a weathering agent, an antistatic agent, a yarn friction reducing agent, a slip agent, a release agent, An oxidizing agent, an ion exchange agent, a coloring pigment, and the like can be added. Further, by mixing an inert gas (nitrogen gas, argon gas) into a melt of the thermoplastic resin, a foamed member having a foamed cell diameter of 0.5 to 100 μm is used, and this foamed preform is molded. In addition, light-shielding properties can be improved.

  Further, the plastic member 40a may be made of the same material as the container body 10 (preform 10a). In this case, for example, the plastic member 40 can be selectively placed on a portion of the composite container 10A where the strength is desired to be increased, and the strength of the portion can be selectively increased. For example, a plastic member 40 may be provided around the shoulder 12 and the bottom 30 of the container body 10 to increase the strength of this portion. Examples of such a material include thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate).

  Further, the plastic member 40a may be made of a material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property. In this case, without using a multilayer preform or a preform containing a blend material as the preform 10a, the gas barrier property of the composite container 10A is improved, oxygen is prevented from entering the container, and the content liquid is prevented from deteriorating. In addition, the water vapor can be prevented from evaporating from the inside of the container to the outside, and a decrease in the internal capacity can be prevented. For example, in the container body 10, except for the central part of the mouth part 11 and the bottom part 30, except for the center part of the shoulder part 12, the neck part 13, the body part 20 and the bottom part 30, a plastic member 40 is provided to enhance the gas barrier property of this part. May be. Examples of such a material include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), PGA (polyglycolic acid), EVOH (ethylene-vinyl alcohol copolymer), and oxygen-containing materials such as fatty acid salts. It is also conceivable to mix an absorbent material.

  Further, the plastic member 40a may be made of a material having a light barrier property against ultraviolet rays or the like. In this case, without using a multilayer preform or a preform containing a blend material as the preform 10a, the light barrier property of the composite container 10A can be enhanced, and the deterioration of the content liquid due to ultraviolet rays or the like can be prevented. For example, in the container main body 10, except for the central part of the mouth part 11 and the bottom part 30, except for the central part of the shoulder part 12, the neck part 13, the body part 20 and the bottom part 30, a plastic member 40a is provided, and the ultraviolet ray barrier property of this part is provided. May be raised. As such a material, a blended material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered. Alternatively, a foamed member having a foam cell diameter of 0.5 to 100 μm, which is produced by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, may be used.

  Further, the plastic member 40a may be made of a material having a higher heat insulating property (a material having low 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 of the composite container 10A is enhanced. For example, a plastic member 40 may be provided on all or a part of the body 20 and the bottom 30 of the container body 10 to enhance the coolness of the body 20. Further, when the user holds the composite container 10A, it is prevented that the composite container 10A becomes difficult to hold due to too cold. Examples of such a material include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, and melamine resin. It is preferable to mix hollow particles with a resin material containing these resins. The average particle diameter of the hollow particles is preferably from 1 to 200 μm, more preferably from 5 to 80 μm. The “average particle diameter” means a volume average particle diameter, 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 a glass or the like. Hollow particles are preferred. Examples of the resin constituting the organic hollow particles include a styrene resin such as a crosslinked styrene-acryl resin, a (meth) acryl resin such as an acrylonitrile-acryl resin, a phenol resin, a fluorine resin, a polyamide resin, and a polyimide. Resin, polycarbonate resin, polyether resin and the like. In addition, Ropeike HP-1055, Ropeke HP-91, Ropeke OP-84J, Ropeke Ultra, Ropeke SE, Ropeke ST (manufactured by Rohm and Haas Co., Ltd.), Nipol MH-5055 (manufactured by Nippon Zeon Co., Ltd.), SX8782 And SX866 (manufactured by JSR Corporation) can also be used. The content of the hollow particles is preferably 0.01 to 50 parts by mass, more preferably 1 to 20 parts by mass, based on 100 parts by mass of the resin material contained in the plastic member 40a.

  Further, the plastic member 40a may be made of a material that is less slippery than the plastic material forming the container body 10 (preform 10a). In this case, the user can easily grip the composite container 10A without changing the material of the container body 10. For example, a plastic member 40 may be provided on all or part of the body 20 and the bottom 30 of the container body 10 to make the body 20 easier to hold.

  The plastic member 40a may be printed in advance such as design or printing. In this case, the printing may be formed by designing or printing on the plain plastic member 40a by a printing method such as an inkjet method or a gravure printing method. This printing may be performed on the plastic member 40a before being attached to the preform 10a, or may be performed with the plastic member 40a provided outside the preform 10a. The plastic member 40a may be colored in red, blue, yellow, green, brown, black, white, or the like, and may be transparent or opaque.

  Next, a method for manufacturing the composite preform 70 according to the present embodiment will be described with reference to FIGS.

  First, a preform 10a made of a plastic material is prepared (see FIG. 4A). In this case, for example, the preform 10a may be manufactured by an injection molding method using an injection molding machine (not shown). The preform 10a has a mouth 11a, a cylindrical body 20a, and a substantially hemispherical bottom 30a, and a substantially cylindrical gate 35 is formed at the center of the outer surface of the bottom 30a. I have. The gate 35 is an unnecessary portion remaining on the bottom portion 30a when the preform 10a is manufactured by, for example, an injection molding method, and corresponds to the resin in the gate portion of the injection molding die. The height H (length along the axial direction of the preform 10a) H of the gate 35 is, for example, about 0.1 mm to 15 mm. By setting the height H of the gate 35 in this range, the operation of cutting the gate 35 (see FIG. 4D) can be easily performed.

  Next, a plastic member (outside contraction member) 40a is provided (slowly inserted) outside the preform 10a (see FIG. 4B). In this case, the plastic member (outer shrinkable member) 40a has a bottomed cylindrical shape as a whole, and has a cylindrical body 41 and a bottom 42 connected to the body 41. The plastic member (outer shrinkable member) 40a is mounted so as to cover the entire region of the trunk 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom 30a.

  Next, the preform 10a and the plastic member (outside contraction member) 40a are heated by the heating device 55 (see FIG. 4C). At this time, the preform 10a and the plastic member (outside contraction member) 40a are uniformly heated in the circumferential direction by the heating device 55 while rotating with the mouth 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.

  As described above, when the plastic member (outside contraction member) 40a is heated, the plastic member (outside contraction member) 40a is thermally contracted and adheres to the outside of the preform 10a (see FIG. 4C). . When the plastic member (outside contraction member) 40a itself has contractibility, the plastic member (outside contraction member) 40a is provided outside the preform 10a (see FIG. 4B). The (outer contraction member) 40a may be in close contact with the outside of the preform 10a. At this time, the bottom portion 42 of the plastic member (outside contraction member) 40a contracts along the shape of the gate 35, so that the gate accommodating portion 42a is formed around the gate 35. The gate accommodating portion 42a protrudes outward from the bottom portion 42 of the plastic member (outside contracting member) 40a. The inner shape of the gate accommodating portion 42 a corresponds to the outer shape of the gate 35.

  By providing the shrinkable plastic member 40a outside the preform 10a in this way, an intermediate body 70A having the preform 10a and the plastic member 40a closely attached to the outside of the preform 10a is manufactured. . In the intermediate body 70A, the plastic member 40a is provided so as to surround the outside of the preform 10a, and the bottom portion 42 has a gate housing that covers the gate 35 in a state of being in close contact with the gate 35 of the preform 10a. A portion 42a is formed. In the present embodiment, such an intermediate 70A is also provided.

  Subsequently, the gate 35 of the preform 10a and the gate accommodating portion 42a of the plastic member 40a are cut integrally. In this case, the gate 35 and the gate accommodating portion 42a are horizontally cut by a cutting mechanism 58 such as a blade. As described above, the gate mark projection 34a is formed on the preform 10a by cutting the gate 35, and the opening 44a is formed on the plastic member 40a by cutting the gate housing portion 42a. Further, the gate trace projection 34a is exactly accommodated in the opening 44a.

  In this way, a composite preform 70 including the preform 10a and the substantially bottomed cylindrical plastic member 40a provided outside the preform 10a is obtained (see FIG. 4D). In this case, since the gate trace protrusion 34a of the preform 10a is accommodated in the opening 44a, no gap is formed between the bottom 42 of the plastic member 40a and the bottom 30a of the preform 10a (see FIG. 3).

  As described above, the plastic member 40a is brought into close contact with the outside of the preform 10a in advance, and the composite preform 70 is produced, whereby a series of steps for producing the composite preform 70 (FIGS. 4A to 4D) )) And a series of steps (FIGS. 5A to 5D) for producing a composite container 10A to be described later by blow molding can be performed at different places (factories and the like).

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

  For example, the composite preform 70 is manufactured by the above-described steps (see FIGS. 4A to 4D). Next, the composite preform 70 is heated by the heating device 51 (see FIG. 5A). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the heating device 51 while rotating with the mouth 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 (see FIG. 5B).

  The composite container 10A is formed using the blow mold 50. In this case, the blow mold 50 includes a pair of body dies 50a and 50b that are divided from each other, and a bottom mold 50c (see FIG. 5B). In FIG. 5B, the pair of body molds 50a and 50b are open to each other, and the bottom mold 50c is raised upward. In this state, the composite preform 70 is inserted between the pair of body molds 50a and 50b.

  Next, as shown in FIG. 5 (c), after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed and sealed by the pair of body molds 50a and 50b and the bottom mold 50c. The blow molding die 50 is constructed. Next, air is press-fitted into the preform 10a, and biaxial stretch blow molding is performed on the composite preform 70.

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

  In this way, 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. At this time, the opening 44a of the plastic member 40a forms the opening 44 at the center of the bottom 30 of the plastic member 40. However, the present invention is not limited to this, and the opening 44a may be closed after blow molding.

  Next, as shown in FIG. 5D, the pair of body dies 50a and 50b and the bottom dies 50c are separated from each other, and the composite container 10A is taken out of the blow molding dies 50.

  Thus, according to the present embodiment, by providing opening 44a in bottom 42 of plastic member 40a, when composite preform 70 is manufactured, bottom 42 of plastic member 40a and the bottom of preform 10a are formed. There is no gap between the wire 30a. Thereby, it is possible to prevent a problem that functions such as gas barrier properties are impaired due to air remaining between the container body 10 and the plastic member 40 after blow molding. As a result, the composite container 10A provided with various functions and characteristics such as gas barrier properties can be manufactured with high quality.

  According to the present embodiment, the gate 35 of the preform 10a and the gate accommodating portion 42a of the plastic member 40a are integrally cut. Thereby, in the composite container 10A after blow molding, it is possible to suppress the shape of the periphery of the bottom 30 of the container body 10 from varying. For example, variation in the shape of the opening 44 described above can be suppressed. Further, since the gate 35 and the gate accommodating portion 42a are integrally cut, there is no need to perform an operation of fitting the gate 35 into the gate accommodating portion 42a, and the gate 35 and the gate accommodating portion 42a may be displaced from each other. Absent. As a result, a composite container provided with various functions and characteristics such as gas barrier properties can be manufactured with high quality.

  Furthermore, according to the present embodiment, by performing blow molding on the composite preform 70 in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded, A composite container 10A including the container body 10 and the plastic member 40 is manufactured. Thereby, the preform 10a (container main body 10) and the plastic member 40a (plastic member 40) can be constituted by different members. Therefore, by appropriately selecting the type and shape of the plastic member 40, it is possible to freely impart various functions and characteristics to the composite container 10A.

  Furthermore, according to the present embodiment, when manufacturing the composite container 10A, a general blow molding apparatus can be used as it is, so that it is necessary to prepare new molding equipment for manufacturing the composite container 10A. Absent. Further, since the plastic member 40a is provided outside the preform 10a, there is no need to prepare new molding equipment for molding the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 6 to 10 are views showing a second embodiment of the present invention. 6 to 10, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

  First, the outline of the composite container according to the present embodiment will be described with reference to FIGS.

  The composite container 10A shown in FIGS. 6 and 7 includes a container body 10 made of a plastic material located inside, an inner label member 60 provided in close contact with the outside of the container body 10, and an outer side of the inner label member 60. And a plastic member 40 provided in close contact therewith.

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

  Further, the plastic member 40 is in close contact with the outer surface of the container main body 10 and the outer surface of the inner label member 60 in a thinly extended state, and is in close contact with the container main body 10 so as not to easily move or rotate. I have.

  It is conceivable that at least a part of the plastic member 40 is translucent or transparent. In this case, the inner label member 60 can be visually recognized from outside through the translucent or transparent portion. The plastic member 40 may be entirely translucent or transparent, or may have an opaque portion and a translucent or transparent portion (for example, a window).

  Next, the inner label member 60 will be described. The inner label member 60 (60a) is provided so as to surround the outside of the preform 10a as described later, and is obtained by being biaxially stretch blow-molded integrally with the preform 10a and the plastic member 40a. Things.

  The inner label member 60 is attached to the outer surface of the container body 10 without being adhered thereto, and is tightly attached to the container body 10 so as not to move or rotate. The inner label member 60 is thinly stretched on the outer surface of the container body 10 to cover the container body 10. As shown in FIG. 7, the inner label member 60 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

  In this case, the inner label member 60 is provided so as to cover the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container main body 10 except for the central portion of the mouth portion 11, the neck portion 13, and the bottom portion 30. Accordingly, desired characters, images, and the like can be given to the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10, and the composite container 10A can be provided with decorativeness or display information.

  Note that the inner label member 60 may be provided in the whole or a part of the container body 10 other than the mouth 11. For example, the inner label member 60 may be provided so as to cover the entire neck portion 13, the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of the inner label members 60 is not limited to one, but may be plural. Note that the inner label member 60 may be provided in the same region as the plastic member 40 or may be provided in a region smaller than the plastic member 40. In the latter case, the inner label member 60 is preferably completely covered by the plastic member 40.

  As such an inner label member 60, a film of a polyester resin, a polyamide resin, a polyaramid resin, a polypropylene resin, a polycarbonate resin, a polyacetal resin, a fluorine resin, or the like can be used. The inner label member 60 may be made of the same material as the plastic member 40 or may be made of a different material.

  The thickness of the inner label member 60 is not limited to this, but can be, for example, about 1 μm to 100 μm in a state where the inner label member 60 is attached to the container body 10.

  As shown in FIG. 6, the plastic member 40 and the inner label member 60 have openings 44 and 64 located at the center of the bottom portion 30, respectively. The openings 44 and 64 correspond to openings 44a and 64a for accommodating a gate mark protrusion 34a described later. However, such openings 44 and 64 need not always be provided. For example, the bottom portion 30 may be completely covered by the plastic member 40 and the inner label member 60 by closing the openings 44 and 64a after blow molding.

  In addition, since the configurations of the container body 10 and the plastic member 40 are substantially the same as those in the first embodiment described above, detailed description is omitted here.

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

  As shown in FIG. 8, the composite preform 70 includes a preform 10a made of a plastic material, a substantially bottomed cylindrical inner label member 60a provided in close contact with the outside of the preform 10a, and an inner label member 60a. And a substantially cylindrical plastic member 40a with a bottom provided in close contact with the outside.

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

  The inner label member 60a may be designed or printed in advance. For example, text information such as the name of the content liquid, the manufacturer, the name of the raw material, and the like may be described in addition to the design and the product name. In this case, images and characters can be displayed on the composite container 10A without separately applying a label or the like to the container body 10 after blow molding. For example, an inner label member 60a may be provided on all or a part of the body 20a of the preform 10a, and images and characters may be displayed on the body 20 of the container body 10 after molding. This eliminates the need for a step of applying a label using a labeler after the container is sealed, so that manufacturing costs can be suppressed and a decrease in yield can be prevented.

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

  8, the inner label member 60a has a substantially cylindrical shape with a bottom as a whole, and has a cylindrical body 61 and a substantially hemispherical bottom 62 connected to the body 61. The bottom 62 is provided with an opening 64a penetrating the bottom 62. The opening 64a accommodates the gate mark protrusion 34a of the preform 10a, and is provided at a position corresponding to the gate mark protrusion 34a when the inner label member 60a is mounted on the preform 10a.

  On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without being adhered thereto, and is adhered to the preform 10a so as not to move or rotate, or to such an extent that it does not drop by its own weight. Have been.

  An opening 44a for accommodating the gate mark protrusion 34a of the preform 10a is provided at the center of the bottom 42 of the plastic member 40a. The opening 44a is formed through the bottom 42 of the plastic member 40a, and is provided around the gate trace projection 34a.

  The inner label member 60a and the plastic member 40a may be provided in the entire area or a part of the area other than the opening 11a and the gate trace projection 34a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body 20a and the bottom 30a except for the opening 11a and the gate trace protrusion 34a. Further, the number of the inner label member 60a and the plastic member 40a is not limited to one, but may be plural.

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

  Next, a method for manufacturing the composite preform 70 according to the present embodiment will be described with reference to FIGS.

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

  Next, an inner label member 60a is provided (loosely inserted) outside the preform 10a, and a plastic member (outer contraction member) 40a is provided (loosely inserted) outside the inner label member 60a (FIG. 9 ( b)). The inner label member 60a has a substantially cylindrical shape with a bottom as a whole, and has a cylindrical body 61 and a bottom 62 connected to the body 61.

  Subsequently, the preform 10a, the plastic member (outer contraction member) 40a, and the inner label member 60a are heated by the heating device 55 (see FIG. 9C). At this time, the preform 10a, the plastic member (outside contraction member) 40a, and the inner label member 60a are uniformly heated in the circumferential direction by the heating device 55 while rotating with the opening 11a facing downward.

  As described above, the plastic member (outside contraction member) 40a and the inner label member 60a are heated, whereby the plastic member (outside contraction member) 40a and the inner label member 60a are thermally contracted, respectively, and the outer side of the preform 10a. (See FIG. 9C). At this time, the bottom portions 42, 62 of the plastic member (outside contraction member) 40a and the inside label member 60a contract along the shape of the gate 35, respectively, thereby forming gate accommodation portions 42a, 62a for accommodating the gate 35. Is done.

  Thus, by providing the shrinkable plastic member 40a and the inner label member 60a on the outside of the preform 10a, the preform 10a, the inner label member 60a adhered to the outer side of the preform 10a, and the inner label An intermediate 70A having the plastic member 40a closely attached to the outside of the member 60a is manufactured. In the intermediate body 70A, the plastic member 40a and the inner label member 60a are provided so as to surround the outside of the preform 10a, and the bottom portions 42 and 62 have gate housings covering the gate 35 of the preform 10a, respectively. Parts 42a and 62a are formed.

  Subsequently, the gate 35 of the preform 10a, the gate accommodating portion 42a of the plastic member 40a, and the gate accommodating portion 62a of the inner label member 60a are integrally cut. In this case, the gate 35 and the gate accommodating portions 42a and 62a may be cut in the horizontal direction by a cutting mechanism 58 such as a blade. Thus, the gate mark projection 34a is formed on the preform 10a by cutting the gate 35, and the opening 44a is formed on the plastic member 40a and the inner label member 60a by cutting the gate accommodating portions 42a and 62a. , 64a are respectively formed.

  Thus, a composite preform 70 including the preform 10a, the inner label member 60a, and the plastic member 40a is obtained (see FIG. 9D).

  As described above, the plastic member 40a is brought into close contact with the outside of the preform 10a and the inner label member 60a in advance, and the composite preform 70 is produced, whereby a series of steps for producing the composite preform 70 (FIG. 9 ( a) to (d)) and a series of steps (FIGS. 10 (a) to (d)) for producing the composite container 10A by blow molding can be performed in different places (factories and the like).

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

  For example, the composite preform 70 is manufactured by the above-described steps (see FIGS. 9A to 9D). Next, the composite preform 70 is heated by the heating device 51 (see FIG. 10A).

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50. The composite container 10A is molded by using the blow molding die 50, and the container main body 10 and the inner label member provided on the outer surface of the container main body 10 are substantially similar to the case of the first embodiment described above. A composite container 10 </ b> A having the plastic member 40 provided on the outside of the inner label member 60 is obtained (see FIGS. 10B to 10D).

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

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 30, 30a Bottom part 31 Concave part 32 Ground part 34a Gate mark protrusion 35 Gate 40, 40a Plastic Member 41 Body 42 Bottom 42a, 62a Gate accommodating part 44, 44a Opening 60, 60a Inner label member 70 Composite preform 70A Intermediate

Claims (6)

In a method for producing a composite preform,
A step of preparing a preform made of a plastic material having a mouth, a trunk, and a bottom, and a gate formed on the bottom,
Providing a plastic member outside the preform,
A step of forming a gate accommodating portion that covers the gate in the plastic member while shrinking the plastic member to make the plastic member adhere to the outside of the preform;
A step of integrally cutting the gate of the preform and the gate accommodating portion of the plastic member.   The method of claim 1, wherein a height of the gate is 0.1 mm to 15 mm.   The method for producing a composite preform according to claim 1, wherein a gate mark protrusion is formed by cutting the gate, and a height of the gate mark protrusion is 0.1 mm to 5 mm. In a composite preform,
A preform made of a plastic material having a mouth, a body, and a bottom having a screw portion and a flange portion, and a gate mark projection formed on the bottom.
A plastic member provided to surround the outside of the preform and having a bottom formed with an opening for accommodating the gate trace projection of the preform,
The plastic member is in close contact with the outside of the preform so as to be removable.
A composite preform, wherein a lower surface of the plastic member and a lower surface of the gate mark projection are located on the same plane. The composite preform according to claim 4, wherein the height of the gate mark protrusion is 0.1 mm to 5 mm. In the method for manufacturing a composite container,
A step of preparing a preform made of a plastic material having a mouth, a trunk, and a bottom, and a gate formed on the bottom,
Providing a plastic member outside the preform;
A step of forming a gate receiving portion that covers the gate in the plastic member, by shrinking the plastic member to make the plastic member adhere to the outside of the preform;
A step of integrally cutting the gate of the preform and the gate receiving portion of the plastic member,
Performing blow molding on the preform and the plastic member to expand the preform and the plastic member integrally.

Images