JP2017013383A - Composite preform, method for producing the same, intermediate body, composite container and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite preform capable of producing a composite container imparted with various functions and characteristics such as gas barrier, a method for producing the same, an intermediate body, a composite container, and a method for producing the same.SOLUTION: A preform 10a made of a plastic material having a mouth part 11a, a barrel part 20a and a bottom part 30a, and in which a gate 35 is formed at the bottom part 30a is prepared, and a plastic member 40a is provided at the outside of the preform 10a. By shrinking the plastic member 40a, the plastic member 40a is adhered to the outside of the preform 10a, and further, a gate storage part 42a of covering a gate 35 is formed at the plastic member 40a. A composite preform 70 is obtained by integrally cutting the gate 35 of the preform 10a and the gate storage part 42a of the plastic member 40a.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a composite preform and a manufacturing method thereof, an intermediate, and a composite container and a manufacturing method thereof.

  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.

JP 2009-241526 A

  The present invention has been made in consideration of such points, and is capable of manufacturing a composite container having various functions and characteristics such as gas barrier properties with high quality and a method for manufacturing the same. It is an object to provide an intermediate, a composite container, and a method for producing the same.

  The present invention provides a method for manufacturing a composite preform, the step of preparing a preform made of a plastic material having a mouth portion, a body portion, and a bottom portion, and having a gate formed on the bottom portion, and on the outside of the preform. A step of providing a plastic member; and a step of shrinking the plastic member to bring the plastic member into close contact with the outside of the preform and forming a gate accommodating portion that covers the gate on the plastic member; A method for manufacturing a composite preform, comprising: a step of integrally cutting the gate of the preform and the gate housing portion of the plastic member.

  The present invention is the method of manufacturing 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 the gate trace protrusion is formed by cutting the gate, and the height of the gate trace protrusion is 0.1 mm to 5 mm.

  The present invention provides an intermediate for producing a composite preform, which includes a preform made of a plastic material having a mouth portion, a trunk portion, and a bottom portion, and having a gate formed on the bottom portion, and surrounds the outside of the preform. And a plastic member having a bottom portion formed with a gate accommodating portion that covers the gate while being 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.

  The present invention is the intermediate body characterized in that the height of the gate is 0.1 mm to 15 mm.

  The present invention provides a composite preform having a mouth portion, a body portion, and a bottom portion, and a plastic material preform having a gate mark protrusion formed on the bottom portion and surrounding the outside of the preform. A plastic member having a bottom portion in which an opening for accommodating the gate mark protrusion of the preform is formed, the plastic member being in close contact with the outside of the preform, and a lower surface of the plastic member The composite preform is characterized in that a lower surface of the gate mark protrusion is located on the same plane.

  The present invention is the composite preform characterized in that the height of the gate mark protrusion is 0.1 mm to 5 mm.

  The present invention relates to a method of manufacturing a composite container, the step of preparing a preform made of a plastic material having a mouth portion, a body portion, and a bottom portion and having a gate formed on the bottom portion, and a plastic on the outside of the preform. A step of providing a member, and a step of shrinking the plastic member to bring the plastic member into close contact with the outside of the preform and forming a gate accommodating portion that covers the gate on the plastic member; By cutting the gate of the preform and the gate accommodating portion of the plastic member together, and performing blow molding on the preform and the plastic member, the preform and the plastic And a step of inflating the manufactured member as a unit Vessels is a method of manufacturing.

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

  According to the present invention, since the gate of the preform and the gate accommodating portion of the plastic member are cut as a unit, variation in the shape around the bottom of the container body can be reduced in the composite container after blow molding. . Thereby, the composite container provided with various functions and characteristics, such as gas barrier property, 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 sectional view showing the composite container according to the first embodiment of the present invention (sectional view taken along the line II-II in FIG. 1). FIG. 3 is a partial vertical sectional view showing the composite preform according to the first embodiment of the present invention. 4A to 4D are schematic views showing a method for manufacturing a composite preform according to the first embodiment of the present invention. 5A to 5D are schematic views showing 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 in 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 the second embodiment of the present invention. 9A to 9D are schematic views showing a method for manufacturing a composite preform according to the second embodiment of the present invention. FIGS. 10A to 10D are schematic views showing 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 produced by the composite container manufacturing method (blow molding method) according to the present embodiment will be described with reference to FIGS. 1 and 2. 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. 3) including a preform 10a and a plastic member 40a using a blow molding die 50, as will be described later. By performing blow molding, the preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded.

  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 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 12 is located between the neck 13 and the trunk 20 and has a shape whose diameter gradually increases from the neck 13 toward the trunk 20.

  Furthermore, 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. Moreover, in this Embodiment, although the unevenness | corrugation is not formed in the trunk | drum 20, and has a substantially flat surface, it is not restricted to this. For example, unevenness such as a panel or a groove may be formed on 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, although 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-250 micrometers (50 micrometers or more and 250 micrometers or less. The same applies hereafter). Further, the weight of the container body 10 is not limited to this, but can be 10 g to 20 g. 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. As the material of the preform 10a, that is, the container body 10, a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), or PC (polycarbonate) may be used. preferable. 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 extrusion molding or injection molding, for example, the intermediate layer has gas barrier properties and light shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). You may form as a multilayer bottle which has gas barrier property and light-shielding property by shape | molding the preform 10a which consists of 3 or more layers as resin which has (intermediate layer), and carrying out blow molding. As the intermediate layer, a resin obtained by blending the above-described various resins may be used.

  Further, by mixing an inert gas (nitrogen gas, argon gas) with the thermoplastic resin melt, a foam preform having a foam cell diameter of 0.5 to 100 μm is formed, and this foam preform is blow-molded. Thus, the container body 10 may be manufactured. 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 a bottle with a full capacity of 100 ml to 2000 ml, for example. Alternatively, the container main 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 outer side of the preform 10a. It is a thing. As will be described later, the plastic member 40 is produced by stretching a plastic member 40a together with the preform 10a.

  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 shoulder portion 12, the trunk portion 20, and the bottom portion 30 except for the mouth portion 11, the neck portion 13, and the center portion of the bottom portion 30 in the container body 10. Thereby, desired functions and characteristics can be imparted to the shoulder portion 12, the trunk 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 trace protrusion 34a described later. However, such an opening 44 is not necessarily provided. For example, the bottom 30 may be completely covered by the plastic member 40 by closing the opening 44a after blow molding.

  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 neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of plastic members 40 is not limited to one, and a plurality of plastic members 40 may be provided. For example, you may provide the two plastic members 40 in the outer surface of the shoulder part 12, and the outer surface of the bottom part 30, respectively.

  On the other hand, 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.

  The thickness of the plastic member 40 is not limited to this, but can be set to, for example, about 5 μm to 500 μm in a state of being 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. The plastic member 40 may be (semi) transparent or opaque. In this case, for example, the plastic member 40 may be colored with 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 a visible light color. When producing the plastic member 40 colored in visible light color, 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 structure of the composite preform according to this embodiment will be described with reference to FIG.

  As shown in FIG. 3, the composite preform 70 includes a preform 10a made of a plastic material and a substantially 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.

  A substantially cylindrical gate mark protrusion 34a is formed at the center (lower end) of the bottom 30a. This gate mark protrusion 34a is an unnecessary portion remaining on the bottom 30a when the preform 10a is produced by, for example, injection molding, and corresponds to the resin in the gate portion of the injection mold. As will be described later, the gate mark protrusion 34a is formed by cutting the gate 35 of the preform 10a together with the gate accommodating portion 42a of the plastic member 40a. For this reason, the lower surface 40c of the plastic member 40a and the lower surface 34b of the gate trace protrusion 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 trace protrusion 34a is, for example, about 0.1 mm to 5 mm, and the width (diameter) d of the gate trace 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 portion 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 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 excluding the portion 13a corresponding to the neck 13 of the container body 10 in the trunk portion 20a and the entire region excluding the lower surface 34b of the gate trace protrusion 34a in the bottom portion 30a. It has been. Moreover, the plastic member 40a may be colored in visible light colors 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 excluding the mouth portion 11a and the lower surface 34b of the gate trace protrusion 34a. For example, the plastic member 40a may be provided so as to cover the neck portion 13a, the trunk portion 20a, and the bottom portion 30a except for the mouth portion 11a and the lower surface 34b of the gate mark protrusion 34a. Furthermore, the number of plastic members 40a is not limited to one, and a plurality of plastic members 40a may be provided. For example, you may provide the two plastic members 40a in the outer side of the trunk | drum 20a, and the outer side of the bottom part 30a, respectively.

  As shown in FIG. 3, the plastic member 40 a has a substantially bottomed cylindrical shape 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 42 of the plastic member 40a covers almost the entire area of the bottom 30a of the preform 10a (excluding an opening 44a described later), in addition to the trunk 20 of the composite container 10A, Various functions and characteristics such as gas barrier properties can be imparted.

  In the center of the bottom portion 42 of the plastic member 40a, an opening 44a for receiving the gate mark protrusion 34a of the preform 10a is provided. The opening 44a is formed so as to penetrate the bottom portion 42 of the plastic member 40a, and is in close contact with the gate trace protrusion 34a so as to cover the periphery of the gate trace protrusion 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. Therefore, the air remains between the container body 10 and the plastic member 40 after blow molding, thereby providing gas barrier properties. It is possible to prevent a problem that the functions such as the above are 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 central portion of the bottom portion 42, but the position and the number thereof are not limited to this. Further, the shape of the opening 44a is circular when viewed from the bottom surface direction (lower side in FIG. 3). However, it only needs to correspond to the shape of the gate trace protrusion 34a, and is rectangular, elliptical, or rounded rectangle. Shape, rhombus shape, triangle shape, pentagon 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 protrusion 34a, and is, for example, about 0.1 mm to 5 mm.

  Thus, by providing the opening 44a for accommodating the gate mark protrusion 34a in the bottom portion 42 of the plastic member 40a, no gap is generated between the bottom portion 42 of the plastic member 40a and the bottom portion 30a of the preform 10a. . Thereby, the malfunction which functions, such as gas barrier property, are impaired by air remaining between the container main body 10 and the plastic members 40 after blow molding can be prevented.

  As such a plastic member 40a, a member having a contracting action on the preform 10a is used. In this case, as the plastic member (outer contraction member) 40a, for example, a member that contracts (for example, thermal contraction) with respect to the preform 10a when an external action (for example, heat) is applied 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.

  Examples of the plastic member 40a 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, fluororesin, 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 poly , Polycarbonate, ethylene polyterephthalate, polybutylene terephthalate, poly ethylene naphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene Examples thereof include sulfide, polyethersulfone, 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), 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 40a as long as 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. Also, by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, a foam member having a foam cell diameter of 0.5 to 100 μm is used, and this foam preform is molded. , The light shielding property can be improved.

  The plastic member 40a may be made of the same material as the container body 10 (preform 10a). In this case, in the composite container 10A, for example, the plastic member 40 can be intensively arranged at a portion where the strength is to be increased, and the strength of the portion can be selectively increased. For example, plastic members 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 materials include thermoplastic resins, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate), and PC (polycarbonate).

  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 multi-layer 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, it is possible to prevent the evaporation of water vapor from the inside of the container to the outside and to prevent the internal volume from decreasing. For example, a plastic member 40 is provided on the entire region of the shoulder portion 12, the neck portion 13, the trunk portion 20 and the bottom portion 30 except for the central portion of the mouth portion 11 and the bottom portion 30 in the container body 10, and the gas barrier property of this portion is enhanced. May be. Examples of such materials include PE (polyethylene), PP (polypropylene), MXD-6 (nylon), PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), and oxygen such as fatty acid salts in these materials. It is also possible to mix an absorbent material.

  The plastic member 40a may be made of a material having a light barrier property 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. For example, a plastic member 40a is provided in the entire region of the shoulder portion 12, the neck portion 13, the trunk portion 20, and the bottom portion 30 except for the central portion of the mouth portion 11 and the bottom portion 30 in the container body 10, and the ultraviolet barrier property of this portion is increased. May be raised. 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 0.5-100 micrometers produced by mixing inert gas (nitrogen gas, argon gas) with the melt of a thermoplastic resin.

  Further, the plastic member 40a may be made of a material having a higher cold insulation property (a material having a 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 cool property of 10 A of composite containers is improved. For example, the plastic body 40 may be provided on the whole or a part of the body part 20 and the bottom part 30 in the container body 10 to enhance the cold insulation of the body part 20. 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. 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 to 200 μm, and more preferably 5 to 80 μm. The “average particle size” means the volume average particle size and is measured by a known method using a particle size distribution / particle size distribution 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 0.01-50 mass parts with respect to 100 mass parts of resin materials contained in the plastic members 40a, and it is more preferable that it is 1-20 mass parts.

  The plastic member 40a 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. 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 so that the body 20 can be easily held.

  The plastic member 40a may be preliminarily printed with design or printing. In this case, the printing may be formed by designing or printing 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 in a state where the plastic member 40a is provided outside the preform 10a. 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, 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 unillustrated injection molding machine. The preform 10a has a mouth portion 11a, a cylindrical body portion 20a, and a substantially hemispherical bottom portion 30a. A substantially cylindrical gate 35 is formed at the center of the outer surface of the bottom portion 30a. Yes. The gate 35 is an unnecessary portion remaining on the bottom 30a when the preform 10a is produced by, for example, an injection molding method, and corresponds to the resin in the gate portion of the injection mold. The height (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 within this range, the operation of cutting the gate 35 (see FIG. 4D) can be easily performed.

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

  Next, the preform 10a and the plastic member (outer contraction member) 40a are heated by the heating device 55 (see FIG. 4C). At this time, the preform 10a and the plastic member (outer contraction member) 40a are uniformly heated in the circumferential direction by the heating device 55 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 manner, 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. 4C). . In the case where 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. 4B). (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 (outer contraction member) 40 a contracts along the shape of the gate 35, so that the gate accommodating portion 42 a is formed around the gate 35. The gate accommodating portion 42a protrudes outward from the bottom portion 42 of the plastic member (outer contraction member) 40a. The inner surface shape of the gate accommodating portion 42 a corresponds to the outer surface shape of the gate 35.

  In this manner, by providing the shrinkable plastic member 40a on the outside of the preform 10a, an intermediate 70A having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is produced. . In this intermediate body 70A, the plastic member 40a is provided so as to surround the outer side of the preform 10a, and the bottom portion 42 accommodates a gate that covers the gate 35 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 together. In this case, the gate 35 and the gate accommodating portion 42a are cut in the horizontal direction by a cutting mechanism 58 such as a blade. In this way, the gate 35 is cut to form the gate trace protrusion 34a on the preform 10a, and the gate accommodating portion 42a is cut to form the opening 44a in the plastic member 40a. Moreover, the gate trace protrusion 34a is exactly accommodated inside the opening 44a.

  In this way, a composite preform 70 including the preform 10a and a 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, there is no gap between the bottom 42 of the plastic member 40a and the bottom 30a of the preform 10a (see FIG. 3).

  In this way, a series of steps for producing the composite preform 70 (FIGS. 4A to 4D) are performed by previously bringing the plastic member 40a into close contact with the outside of the preform 10a and producing the composite preform 70. )) And a series of steps (FIGS. 5A to 5D) for producing a composite container 10A, which will be described later, by blow molding, can be performed at different places (factory, etc.).

  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 produced 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 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 molding die 50 (see FIG. 5B).

  The composite container 10 </ b> A is molded using this blow molding die 50. In this case, the blow mold 50 includes a pair of body molds 50a and 50b and a bottom mold 50c which are divided from each other (see FIG. 5B). In FIG. 5 (b), the pair of body molds 50a, 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. A blow mold 50 is formed. Next, air is press-fitted into the preform 10 a and biaxial stretch blow molding is performed on the composite preform 70.

  As a result, the container body 10 is obtained from the preform 10 a 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 mold 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded as a unit. Thereby, the preform 10a and the plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow mold 50.

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

  Next, as shown in FIG. 5 (d), the pair of body molds 50 a and 50 b and the bottom mold 50 c are separated from each other, and the composite container 10 </ b> A is taken out from the blow mold 50.

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

  Moreover, according to this Embodiment, the gate 35 of the preform 10a and the gate accommodating part 42a of the plastic member 40a are cut | disconnected integrally. Thereby, in composite container 10A after blow molding, it can suppress that the shape of the periphery of the bottom part 30 of the container main body 10 varies. For example, variations in the shape of the opening 44 described above can be suppressed. Further, since the gate 35 and the gate accommodating portion 42a are cut together, there is no need to perform the work of fitting the gate 35 into the gate accommodating portion 42a, and there is a possibility that the gate 35 and the gate accommodating portion 42a are 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 expanded as a unit, A composite container 10A including the container body 10 and the plastic member 40 is produced. Thereby, preform 10a (container main part 10) and plastic member 40a (plastic member 40) can be constituted from another member. Therefore, various functions and characteristics can be freely imparted to the composite container 10A by appropriately selecting the type and shape of the plastic member 40.

  Furthermore, according to the present embodiment, when producing the composite container 10A, a general blow molding apparatus can be used as it is, so that it is necessary to prepare a new molding facility for producing the composite container 10A. Absent. Moreover, since the plastic member 40a is provided outside the preform 10a, it is not necessary to prepare a new molding facility 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 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, the outline | summary of the composite container by this Embodiment is demonstrated with FIG. 6 and FIG.

  A 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.

  Among these, 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.

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

  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 the outside through the translucent or transparent portion. The plastic member 40 may be entirely translucent or transparent, or may have an opaque portion and a translucent or transparent portion (for example, a window portion).

  Next, the inner label member 60 will be described. As will be described later, the inner label member 60 (60a) is provided so as to surround the outer side of the preform 10a. Is.

  The inner label member 60 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 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 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. Thereby, desired characters, images, and the like can be imparted to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container main body 10, and the composite container 10A can be decorated and information can be displayed.

  The inner label member 60 may be provided in the entire region or a partial region other than the mouth portion 11 of the container main body 10. For example, the inner label member 60 may be provided so as to cover the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10 except the mouth portion 11. Furthermore, the inner label member 60 is not limited to one, and a plurality of inner label members 60 may be provided. The inner label member 60 may be provided in the same region as the plastic member 40, or may be provided in a region narrower 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 made of polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate resin, polyacetal resin, 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.

  Further, the thickness of the inner label member 60 is not limited to this, but can be set to, for example, about 1 μm to 100 μm in a state of being 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 positioned at the center of the bottom 30, respectively. The openings 44 and 64 correspond to openings 44a and 64a for accommodating gate trace protrusions 34a described later. However, such openings 44 and 64 are not necessarily provided. For example, the bottom 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 thereof is omitted here.

  Next, the structure of the composite preform according to this 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 outer side of the preform 10a, and an inner label member 60a. And a substantially bottomed cylindrical plastic member 40a provided in close contact with the outer side.

  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 that it does not easily move or rotate, or is in close contact with the preform 10a so that it does not fall 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 previously designed or printed. For example, in addition to the design and product name, character information such as the name of the content liquid, the manufacturer, and the name of the raw material may be described. In this case, it is possible to display images and characters on the composite container 10A without separately providing a label or the like to the container body 10 after blow molding. For example, the inner label member 60a may be provided on all or part of the trunk portion 20a of the preform 10a, and images and characters may be displayed on the trunk portion 20 of the container body 10 after molding. This eliminates the need for a labeling process using a labeler after the container is tightly sealed, so that the manufacturing cost can be suppressed and the yield can be prevented from decreasing.

  As such an inner label member 60a, an unstretched film such as polyester resin, polyamide resin, polyaramid resin, polypropylene resin, polycarbonate resin, polyacetal resin, or 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.

  In FIG. 8, the inner label member 60 a has a generally bottomed cylindrical shape as a whole, and includes a cylindrical body portion 61 and a substantially hemispherical bottom portion 62 connected to the body portion 61. The bottom 62 is provided with an opening 64 a that penetrates the bottom 62. The opening 64a accommodates the gate trace protrusion 34a of the preform 10a, and is provided at a position corresponding to the gate trace protrusion 34a when the inner label member 60a is attached to 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 bonded, and is in close contact with the preform 10a so that it does not move or rotate, or close enough not to fall by its own weight. Has been.

  In the center of the bottom portion 42 of the plastic member 40a, an opening 44a for receiving the gate mark protrusion 34a of the preform 10a is provided. The opening 44a is formed through the bottom 42 of the plastic member 40a and is provided around the gate trace protrusion 34a.

  The inner label member 60a and the plastic member 40a may be provided in the entire region or a partial region other than the mouth portion 11a and the gate trace protrusion 34a. For example, the inner label member 60a and the plastic member 40a may be provided so as to cover the entire body portion 20a and the bottom portion 30a except for the mouth portion 11a and the gate trace protrusion 34a. Furthermore, the inner label member 60a and the plastic member 40a are not limited to one, and a plurality of inner label members 60a and plastic members 40a may be provided.

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

  Next, a manufacturing method of 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, the inner label member 60a is provided (loosely inserted) on the outer side of the preform 10a, and the plastic member (outer contracting member) 40a is provided (loosely inserted) on the outer side of the inner label member 60a (see FIG. 9). b)). The inner label member 60 a has a generally bottomed cylindrical shape as a whole, and includes a cylindrical body portion 61 and a bottom portion 62 connected to the body portion 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 (outer 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 mouth portion 11a facing downward.

  In this way, the plastic member (outer contraction member) 40a and the inner label member 60a are heated, so that the plastic member (outer 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 and 62 of the plastic member (outer contraction member) 40a and the inner label member 60a are contracted along the shape of the gate 35, respectively, thereby forming gate accommodation portions 42a and 62a for accommodating the gate 35. Is done.

  In this way, by providing the shrinkable plastic member 40a and the inner label member 60a on the outer side of the preform 10a, the preform 10a, the inner label member 60a closely attached to the outer side of the preform 10a, and the inner label are provided. An intermediate 70A having a plastic member 40a in close contact with the outside of the member 60a is produced. In this intermediate body 70A, the plastic member 40a and the inner label member 60a are provided so as to surround the outer side of the preform 10a, and the bottom portions 42 and 62 respectively accommodate the gates covering the gate 35 of the preform 10a. Portions 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 cut together. 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. As described above, the gate 35 is cut to form the gate mark protrusion 34a on the preform 10a, and the gate accommodating portions 42a and 62a are cut to open the opening 44a in the plastic member 40a and the inner label member 60a. 64a are formed respectively.

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

  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 the inner label member 60a and 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 at different places (factories, etc.).

  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 produced 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 mold 50. The composite container 10A is molded using this blow molding die 50, and is substantially the same as in the case of the first embodiment described above, and the container body 10 and the inner label member provided on the outer surface of the container body 10. 10 and the composite container 10A provided with the plastic member 40 provided outside 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 thereof is omitted here.

DESCRIPTION OF SYMBOLS 10 Container 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 Recessed part 32 Grounding part 34a Gate trace protrusion 35 Gate 40, 40a Product made from plastic Member 41 Body 42 Bottom 42a, 62a Gate accommodating portion 44, 44a Opening 60, 60a Inner label member 70 Composite preform 70A Intermediate

Claims (9)

In the method for producing a composite preform,
A step of preparing a preform made of a plastic material having a mouth portion, a trunk portion, and a bottom portion, and having a gate formed on the bottom portion;
Providing a plastic member on the outside of the preform;
Shrinking the plastic member to bring the plastic member into close contact with the outside of the preform and forming a gate accommodating portion for covering the gate on the plastic member;
A method for producing a composite preform, comprising: a step of integrally cutting the gate of the preform and the gate housing portion of the plastic member.   2. The method of manufacturing a composite preform according to claim 1, wherein a height of the gate is 0.1 mm to 15 mm.   3. The method of manufacturing a composite preform according to claim 1, wherein the gate trace protrusion is formed by cutting the gate, and the height of the gate trace protrusion is 0.1 mm to 5 mm. In an intermediate for producing a composite preform,
A preform made of a plastic material having a mouth portion, a trunk portion, and a bottom portion, and a gate formed on the bottom portion;
A plastic member provided so as to surround the outside of the preform, and having a bottom portion in which a gate accommodating portion that covers the gate is formed in close contact with the gate of the preform;
The intermediate body, wherein the plastic member is in close contact with the outside of the preform.   The intermediate body according to claim 4, wherein a height of the gate is 0.1 mm to 15 mm. In composite preform,
A preform made of a plastic material having a mouth portion, a trunk portion, and a bottom portion, and a gate mark protrusion formed on the bottom portion;
A plastic member provided to surround the outside of the preform and having a bottom portion in which an opening for accommodating the gate mark protrusion of the preform is formed;
The plastic member is in close contact with the outside of the preform,
The composite preform characterized in that the lower surface of the plastic member and the lower surface of the gate trace protrusion are located on the same plane.   The composite preform according to claim 6, wherein the height of the gate mark protrusion is 0.1 mm to 5 mm. In the manufacturing method of the composite container,
A step of preparing a preform made of a plastic material having a mouth portion, a trunk portion, and a bottom portion, and having a gate formed on the bottom portion;
Providing a plastic member on the outside of the preform;
Shrinking the plastic member to bring the plastic member into close contact with the outside of the preform and forming a gate accommodating portion for covering the gate on the plastic member;
Cutting the gate of the preform and the gate housing portion of the plastic member together;
And a step of blowing the preform and the plastic member together to expand the preform and the plastic member as a unit.   A composite container manufactured by the method for manufacturing a composite container according to claim 8.

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