JP2016088028A - Manufacturing method of composite container, composite preform and composite container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a composite container capable of imparting various functions and properties such as a gas barrier property to a container, allowing the container having excellent chemical resistance, flexibility, and impact resistance to be obtained, and also to provide a composite preform, and a composite container.SOLUTION: First, a preform 10a made of polyolefin resin is prepared. Next, a plastic member 40a made of polyester resin is disposed outside the preform 10a. Then, blow molding is applied to the preform 10a and the plastic member 40a so that the preform 10a and the plastic member 40a are integrally expanded.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for manufacturing a composite container, a composite preform, and a composite container.

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

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

  By the way, in the conventional biaxial stretch blow molding method, it shape | molds in a container shape, for example using the preform made from PET (polyethylene terephthalate). However, in the conventional biaxial stretch blow molding method, the preform is generally simply formed into a container shape. For this reason, when various functions and characteristics (barrier property, heat retaining property, etc.) are given to the container, the means is limited, for example, by changing the material constituting the preform.

  In general, PET (polyethylene terephthalate), which is widely used as a material for plastic bottles, is said to be slightly inferior in terms of chemical resistance. For this reason, depending on the type of content liquid, PET may be used as the material for plastic bottles. May not be appropriate.

JP 2009-241526 A

  The present invention has been made in consideration of the above points, and while providing various functions and characteristics such as gas barrier properties to the container, the container is excellent in chemical resistance, flexibility, impact resistance, and the like. It is an object of the present invention to provide a method for manufacturing a composite container, a composite preform, and a composite container.

  The present invention provides a method for producing a composite container, the step of preparing a polyolefin resin preform, the step of providing a plastic member made of a polyester resin on the outside of the preform, the preform and the plastic And a step of expanding the preform and the plastic member integrally by performing blow molding on the made member.

  The present invention is the method for manufacturing a composite container, wherein the preform includes a polyethylene resin or a polypropylene resin.

  The present invention is the method for manufacturing a composite container, wherein the plastic member is an outer contractive member having an effect of contracting the preform.

  The present invention is the method of manufacturing a composite container, wherein the outer contractive member contracts with respect to the preform when heat is applied.

  The present invention further includes a step of providing an inner label member so as to surround the outer side of the preform, and the plastic member is provided on the outer side of the inner label member. .

  The present invention relates to a composite preform for a composite container, comprising a polyolefin resin preform and a polyester resin plastic member provided so as to surround the preform, and the plastic member Is a composite preform characterized in that it is in close contact with the outside of the preform.

  The present invention is the composite preform characterized in that the preform includes a polyethylene resin or a polypropylene resin.

  The present invention is the composite preform, wherein the plastic member is an outer contractive member having a function of contracting with respect to the preform.

  The present invention is the composite preform, wherein the outer contracting member contracts with respect to the preform when heat is applied.

  The present invention further includes an inner label member provided in close contact so as to surround the outer side of the preform, and the plastic member is provided in close contact with the outer side of the inner label member. It is a composite preform.

  The present invention provides a composite container comprising a container body made of polyolefin resin and a plastic member made of polyester resin in close contact with the outside of the container body, wherein the container body and the plastic member are The composite container is expanded as a single body by blow molding.

  The present invention is the composite container, wherein the preform includes a polyethylene resin or a polypropylene resin.

  The present invention is the composite container, wherein the plastic member is an outer contracting member having a contracting action.

  The present invention is the composite container, wherein the outer contractive member contracts when heat is applied.

  The present invention further includes an inner label member provided in close contact so as to surround the outer side of the preform, and the plastic member is provided in close contact with the outer side of the inner label member. It is a composite container.

  ADVANTAGE OF THE INVENTION According to this invention, while giving various functions and characteristics, such as gas barrier property, to a container, the container excellent in chemical resistance, a softness | flexibility, impact resistance, etc. can be provided.

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 perspective views showing various plastic members. FIGS. 5A to 5F are schematic views showing a method of manufacturing the composite container according to the first embodiment of the present invention. FIGS. 6A to 6F are schematic views showing a method for manufacturing a composite container according to a modification of the first embodiment of the present invention. FIGS. 7A to 7G are schematic views illustrating a method for manufacturing a composite container according to a modification of the first embodiment of the present invention. FIG. 8 is a partial vertical sectional view showing a modification of the composite container according to the first embodiment of the present invention. FIG. 9 is a partial vertical sectional view showing a modification of the composite preform according to the first embodiment of the present invention. FIG. 10 is a partial vertical sectional view showing a composite container according to a second embodiment of the present invention. FIG. 11 is a horizontal cross-sectional view (cross-sectional view taken along the line XI-XI in FIG. 10) showing the composite container according to the second embodiment of the present invention. FIG. 12 is a partial vertical sectional view showing a composite preform according to the second embodiment of the present invention. FIGS. 13A to 13F are schematic views showing a method for manufacturing a composite container according to the second embodiment of the present invention. FIGS. 14A to 14F are schematic views showing a method for manufacturing a composite container according to a modification of the second embodiment of the present invention. FIGS. 15A to 15G are schematic views showing a method for manufacturing a composite container according to a modification of the second embodiment of the present invention. FIG. 16 is a partial vertical sectional view showing a modification of the composite container according to the second embodiment of the present invention. FIG. 17 is a partial vertical sectional view showing a modification of the composite preform 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 9 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 polyolefin resin positioned inside, and a plastic member 40 made of polyester resin 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 to about 50 micrometers-250 micrometers. Further, the weight of the container body 10 is not limited to this, but can be 5 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. The preform 10a, that is, the container body 10 is made of a polyolefin resin material such as a polyethylene resin or a polypropylene resin. Specifically, the polyolefin-based resin includes a high-density polyethylene resin, a medium-density polyethylene resin, a polyethylene resin such as a low-density polyethylene resin, a crystalline propylene homopolymer, a crystalline propylene / ethylene random copolymer, Mainly olefin components such as crystalline propylene / α-olefin random copolymer, polypropylene block resin such as crystalline block copolymer of propylene and ethylene and / or α-olefin, and ethylene-vinyl acetate copolymer And a blend resin mainly composed of a polyolefin resin component. Furthermore, various additives other than the main component resin may be added to the material of the container body 10 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. The container body 10 may be colored in colors such as red, blue, yellow, green, brown, black, and white, or may be colorless. 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 extrusion-molding preform 10a which consists of three or more layers as resin which it 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.

  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 outside of the preform 10a, and is obtained by being in close contact with the outside of the preform 10a and then being biaxially stretch blow-molded together with the preform 10a. It is a thing.

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

  In this case, the plastic member 40 is provided so as to cover the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10 except for the mouth portion 11 and the neck portion 13. 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.

  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.

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

  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.

  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 polyolefin resin preform 10a and a polyester resin bottomed cylindrical plastic member 40a provided outside the preform 10a. Yes.

  The preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. Of these, the mouth portion 11 a corresponds to the mouth portion 11 of the container body 10 described above, and has substantially the same shape as the mouth portion 11. Moreover, the trunk | drum 20a respond | corresponds to the neck part 13, the shoulder part 12, and the trunk | drum 20 of the container main body 10 mentioned above, and has a substantially cylindrical shape. The bottom 30a corresponds to the bottom 30 of the container body 10 described above, and has a substantially hemispherical shape.

  The plastic member 40a is attached to the outer surface of the preform 10a without being bonded, and is in close contact with the preform 10a so as not to move or rotate, or in close contact with the preform 10a so as not to fall by its own weight. . The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.

  In this case, the plastic member 40a is provided so as to cover the entire region of the body portion 20a excluding the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a.

  The plastic member 40a may be provided in the entire region or a partial region other than the mouth portion 11a. For example, the plastic member 40a may be provided so as to cover the neck portion 13a, the trunk portion 20a, and the bottom portion 30a except for the mouth portion 11a. Furthermore, the number of plastic members 40a is not limited to one, and a plurality of plastic members 40a may be provided. For example, two plastic members 40a may be provided at two locations outside the trunk portion 20a.

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

  In the former case, as the plastic member 40a, for example, a blow tube produced by blow molding, a sheet molded tube produced by sheet molding, an extruded tube produced by extrusion molding, an inflation molded tube produced by inflation molding, etc. However, the present invention is not limited to this, and molding methods other than those described above may be used.

  In the latter case, that is, when the plastic member (outer contraction member) 40a has an action of contracting, the plastic member (outer contraction member) 40a is, for example, when an external action (for example, heat) is applied. What shrinks | contracts with respect to the reform 10a (for example, heat shrink) 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 material of the plastic member 40a include polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate. 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.

  Moreover, in this Embodiment, since the preform 10a consists of polyolefin resin materials, chemical resistance, a softness | flexibility, and impact resistance are improved. On the other hand, since the material of the plastic member 40 (40a) is made of a polyester-based resin, gas barrier properties such as oxygen barrier properties can be enhanced, and deterioration of the content liquid due to oxygen or the like can be prevented. For example, a plastic member 40 may be provided in the entire region of the shoulder portion 12, the neck portion 13, the trunk portion 20, and the bottom portion 30 of the container body 10, and the gas barrier property of this portion may be improved.

  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 may be provided in the entire region of the shoulder portion 12, the neck portion 13, the trunk portion 20, and the bottom portion 30 of the container body 10 to enhance the ultraviolet barrier property of this portion. As such a material, a blend material or a material obtained by adding a light-shielding resin to a polyester resin such as PET can be considered. Moreover, you may use the foaming member with the foam cell diameter of 0.5-100 micrometers produced by mixing an inert gas (nitrogen gas, argon gas) with the melt of a polyester-type resin.

  Moreover, the plastic member 40a may be made of a material having a higher cold insulation property (a material having a lower thermal conductivity) than the polyolefin resin 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 member 40 may be provided on the whole or a part of the body 20 in the container body 10 to improve the cold insulation of the body 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 a material include polystyrene.

  The plastic member 40a may be made of a material that is less slippery than the polyolefin-based resin constituting 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 part of the body 20 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, the shape of the plastic member 40a will be described.

  As shown in FIGS. 3 and 4A, the plastic 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. May be. In this case, since the bottom part 42 of the plastic member 40a covers the bottom part 30a of the preform 10a, various functions and characteristics such as barrier properties are imparted to the bottom part 30 in addition to the trunk part 20 of the composite container 10A. Can do. Examples of such a plastic member 40a include the above-described blow tube and sheet molded tube.

  Further, as shown in FIGS. 9 (described later) and FIG. 4B, the plastic member 40a has a circular tube shape (bottomless cylindrical shape) as a whole, and has a cylindrical body 41. good. In this case, as the plastic member 40a, for example, the above-described blow tube, extruded tube, inflation molded tube, or sheet molded tube can be used.

  Moreover, as shown in FIG.4 (c) and FIG.4 (d), the plastic members 40a may be produced by forming a film in a cylinder shape and bonding the edge part together. In this case, as shown in FIG. 4 (c), the plastic member 40a may be configured in a tubular shape (bottomless cylindrical shape) having a body portion 41, and as shown in FIG. 4 (d), The bottom 42 may be bonded to form a bottomed cylinder.

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

  First, a preform 10a made of polyolefin resin is prepared (see FIG. 5A). In this case, for example, the preform 10a may be manufactured by an injection molding method using an unillustrated injection molding machine. Moreover, you may use the preform generally used conventionally as the preform 10a.

  Next, a plastic member 40a made of polyester resin is prepared. In this case, the plastic member 40 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body portion 41 and a bottom portion 42 connected to the body portion 41.

  Next, by providing a plastic member 40a on the outside of the preform 10a, a composite preform 70 having the preform 10a and the plastic member 40a in close contact with the outside of the preform 10a is manufactured (FIG. 5 ( b)).

  In this case, a plastic member 40a having an inner diameter that is the same as or slightly smaller than the outer diameter of the preform 10a may be pressed into the preform 10a to be brought into close contact with the outer surface of the preform 10a. Alternatively, as will be described later, a heat-shrinkable plastic member 40a is provided on the outer surface of the preform 10a, and the plastic member 40a is thermally contracted by heating to 50 ° C. to 100 ° C. You may make it stick to.

  In this way, a series of steps for producing the composite preform 70 (FIGS. 5A to 5B) 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. 5 (c) to 5 (f)) for producing the composite container 10A by blow molding can be performed at different places (factories, etc.).

  Next, the composite preform 70 is heated by the heating device 51 (see FIG. 5C). 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, 100 ° C. to 160 ° C.

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 5D).

  The composite container 10 </ b> A is molded using this blow molding die 50. In this case, the blow mold 50 is composed of a pair of body molds 50a and 50b and a bottom mold 50c which are divided from each other (see FIG. 5D). In FIG. 5D, 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. 5E, after the bottom mold 50c is lowered, the pair of body molds 50a, 50b is closed, and sealed by the pair of body molds 50a, 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.

  Next, as shown in FIG. 5 (f), 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 molding mold 50.

Modified Example of Manufacturing Method of Composite Container Next, a modified example of the manufacturing method (blow molding method) of the composite container 10A according to the present embodiment will be described with reference to FIGS. 6 (a) to 6 (f) has a function in which a plastic member (outer contraction member) 40a contracts with respect to the preform 10a, and other configurations are shown in FIG. 5 (a). It is substantially the same as the form shown in (f). 6A to 6F, the same parts as those in FIGS. 5A to 5F are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, a preform 10a made of polyolefin resin is prepared (see FIG. 6A).

  Next, a plastic member (outer contraction member) 40a made of polyester resin is provided on the outer side of the preform 10a (see FIG. 6B). In this case, the plastic member (outer contraction member) 40 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body 41 and a bottom 42 connected to the body 41. 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 51 (see FIG. 6C). At this time, the preform 10a and the plastic member (outer contraction member) 40a are evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member (outer contraction member) 40a in this heating step may be, for example, 100 ° C. to 160 ° C.

  In this way, the plastic member (outer contraction member) 40a is heated, so that the plastic member (outer contraction member) 40a is thermally contracted and is in close contact with the outside of the preform 10a (see FIG. 6C). . When the plastic member (outer contraction member) 40a itself has contractibility, the plastic member at the time when the plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 6B). (Outer contraction member) 40a may be in close contact with the outside of the preform 10a.

  Subsequently, the preform 10a and the plastic member (outer contraction member) 40a heated by the heating device 51 are sent to the blow molding die 50 (see FIG. 6D). In this case, the heating for shrinking the plastic member (outer contraction member) 40a and the heating for blow-molding the preform 10a can be performed in the same process.

  The preform 10a and the plastic member (outer contraction member) 40a are molded by using this blow molding die 50, and are substantially the same as those in FIGS. 5 (a) to 5 (f) described above. A composite container 10A including a plastic member (outer contraction member) 40 provided on the outer surface of the container body 10 is obtained (see FIGS. 6D to 6F).

  Next, with reference to FIGS. 7A to 7G, another modification of the method for manufacturing the composite container 10A (blow molding method) according to the present embodiment will be described. 7 (a) to 7 (g) has an effect that the plastic member (outer contraction member) 40a contracts with respect to the preform 10a, and the preform 10a and the plastic member (outer contraction member) 40a. Is heated in two stages, and the other configuration is substantially the same as the configuration shown in FIGS. 7A to 7G, the same parts as those in FIGS. 5A to 5F are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, a preform 10a made of polyolefin resin is prepared (see FIG. 7A).

  Next, a polyester resin plastic member (outer contraction member) 40a is provided outside the preform 10a (see FIG. 7B).

  Next, the preform 10a and the plastic member (outer contraction member) 40a are heated by the first heating device 55 (see FIG. 7C). At this time, the heating temperature of the preform 10a and the plastic member (outer contraction member) 40a may be, for example, 50 ° C. to 100 ° C.

  By heating the plastic member (outer contraction member) 40a, the plastic member (outer contraction member) 40a is thermally contracted, and is in close contact with the outside of the preform 10a. As a result, a composite preform 70 having the preform 10a and a plastic member (outer contraction member) 40a in close contact with the outside of the preform 10a is obtained (see FIG. 7C).

  In this way, the composite preform 70 is manufactured by preliminarily bringing the plastic member (outer contraction member) 40a into heat contact with the outside of the preform 10a using the first heating device 55, thereby producing the composite preform 70. A series of steps (FIGS. 7 (a) to (c)) and a series of steps (FIGS. 7 (d) to (g)) for producing the composite container 10A by blow molding are performed at different locations (factory etc. ) Can be implemented.

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 7D). At this time, the composite preform 70 is evenly heated in the circumferential direction by the second heating device 51 while rotating with the mouth portion 11a facing downward. The heating temperature of the preform 10a and the plastic member (outer contraction member) 40a in this heating step may be, for example, 100 ° C. to 160 ° C.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 7E).

  The composite preform 70 is molded using the blow mold 50 and is provided on the container body 10 and the outer surface of the container body 10 in substantially the same manner as in the above-described FIGS. A composite container 10A provided with a plastic member (outer contraction member) 40 is obtained (see FIGS. 7E to 7G).

  As described above, according to the present embodiment, since the container body 10 is made of a polyolefin resin and the plastic member 40 (40a) is made of a polyester resin, there are various gas barrier properties and the like with respect to the composite container 10A. In addition to imparting various functions and properties, the chemical resistance, flexibility, impact resistance, etc. of the composite container 10A can be enhanced.

  Further, according to the present embodiment, the preform 10a and the plastic member 40a are integrally expanded in the blow molding die 50, and the composite container 10A including the container body 10 and the plastic member 40 is manufactured. Thereby, 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.

Modified Example of Composite Container and Composite Preform Next, a modified example of the present embodiment will be described with reference to FIGS.

  The modification shown in FIGS. 8 and 9 does not have a body portion and a bottom portion as the plastic member 40a, but uses a cylindrical plastic member 40a.

  In the composite container 10 </ b> A shown in FIG. 8, the plastic member 40 extends from the shoulder 12 of the container body 10 to the lower part of the trunk 20, but does not reach the bottom 30. Further, in the composite preform 70 shown in FIG. 9, the plastic member 40a is in close contact so as to cover only the trunk portion 20a of the preform 10a, and more specifically, the neck portion 13 of the container body 10 in the trunk portion 20a. The region excluding the portion 13a corresponding to the portion and the portion corresponding to the lower portion of the body portion 20a is covered.

  8 and 9, other configurations are substantially the same as those of the embodiment shown in FIGS. In the modification shown in FIGS. 8 and 9, the same parts as those in the embodiment shown in FIGS. Further, the configuration and manufacturing method of the composite container 10A and the configuration and manufacturing method of the composite preform 70 are substantially the same as those in the embodiment shown in FIGS. 8 and 9, the plastic member 40 may have a function of contracting with respect to the preform 10a.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 10 to 17 are views showing a second embodiment of the present invention. 10 to 17, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, an outline of the composite container according to the present embodiment will be described with reference to FIGS. 10 and 11.

  A composite container 10A shown in FIGS. 10 and 11 is formed into a composite preform 70 (see FIG. 12) including a preform 10a, an inner label member 60a, and a plastic member 40a using a blow mold 50, as will be described later. On the other hand, by performing biaxial stretch blow molding, the preform 10a, the inner label member 60a, and the plastic member 40a of the composite preform 70 are integrally expanded.

  Such a composite container 10A has a polyolefin resin container body 10 located inside, an inner label member 60 provided in close contact with the outer side of the container body 10, and an outer side of the inner label member 60. And a plastic member 40 made of polyester resin.

  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, and is obtained by performing biaxial stretch blow molding integrally with the preform 10a and the plastic member 40a. 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. 11, 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 of the container body 10 except for the mouth portion 11 and the neck portion 13. 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 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.

  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.

  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 the present embodiment will be described with reference to FIG.

  As shown in FIG. 12, the composite preform 70 includes a polyolefin resin preform 10a, a 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 plastic member 40a made of a polyester resin having a bottomed cylindrical shape and 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 that it does not easily move or rotate, or is in close contact with the preform 10a so that it does not fall off due to 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) or the plastic member 40a, or may be made of a different material.

  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.

  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. 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. 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. For example, the two inner label members 60a and the plastic member 40a may be provided at two locations on the outer side of the body portion 20a.

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

  First, a preform 10a made of polyolefin resin is prepared (see FIG. 13A).

  Next, the inner label member 60a is provided outside the preform 10a, and the plastic member 40a made of polyester resin is provided outside the inner label member 60a. Thus, a composite preform 70 having the preform 10a, the inner label member 60a in close contact with the outer side of the preform 10a, and the plastic member 40a in close contact with the outer side of the inner label member 60a is produced (FIG. 13). (See (b)). In this case, the inner label member 60 a has a bottomed cylindrical shape as a whole, and includes a cylindrical body portion 61 and a bottom portion 62 connected to the body portion 61.

  At this time, even if the inner label member 60a and the plastic member 40a having the same or slightly smaller inner diameter as the outer diameter of the preform 10a are pressed into the preform 10a, the inner label member 60a may be brought into close contact with the outer surface of the preform 10a. good. Alternatively, the inner label member 60a and the plastic member 40a having heat shrinkability are provided on the outer surface of the preform 10a, and the inner label member 60a and the plastic member 40a are thermally contracted by heating to 50 ° C. to 100 ° C. You may make it closely_contact | adhere to the outer surface of the preform 10a.

  Alternatively, a plastic member 40a may be provided around the inner label member 60a in advance, and the inner label member 60a and the plastic member 40a may be integrally attached to the outside of the preform 10a. Alternatively, the inner label member 60a may be provided outside the preform 10a, and then the plastic member 40a may be provided outside the inner label member 60a.

  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. 13 ( a) to (b)) and a series of steps (FIGS. 13 (c) to (f)) for producing the composite container 10A by blow molding can be carried out in different places (factory or the like).

  Next, the composite preform 70 is heated by the heating device 51 (see FIG. 13C).

  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. 60 and the composite container 10A provided with the plastic member 40 provided outside the inner label member 60 is obtained (see FIGS. 13D to 13F).

  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.

Shows a modification of the modification of the blow molding process diagram 14 (a) ~ (f) and FIGS. 15 (a) ~ (g), the method of manufacturing a composite container 10A according to this embodiment, respectively (blow molding process) It is. 14 (a) to 14 (f) and FIGS. 15 (a) to 15 (g), the same parts as those in FIGS.

  14 (a) to 14 (f), the inner label member 60 is provided outside the preform 10a, and the plastic member (outer contraction member) 40a is provided outside the inner label member 60. Other configurations are substantially the same as those shown in FIGS. 6 (a) to 6 (f).

  15A to 15G, the inner label member 60 is provided outside the preform 10a, and the plastic member (outer contraction member) 40a is provided outside the inner label member 60. Other configurations are substantially the same as those shown in FIGS. 7 (a) to 7 (g).

Modified Example of Composite Container and Composite Preform Next, a modified example of the present embodiment will be described with reference to FIGS.

  The modification shown in FIGS. 16 and 17 does not have a body portion and a bottom portion as the inner label member 60a and the plastic member 40a, but uses a cylindrical inner label member 60a and a plastic member 40a. . Other configurations are substantially the same as those of the embodiment shown in FIGS. In the modification shown in FIGS. 16 and 17, the same parts as those in the embodiment shown in FIGS. 10 to 13 are denoted by the same reference numerals, and detailed description thereof is omitted. The manufacturing method of the composite container 10A and the manufacturing method of the composite preform 70 are also substantially the same as those in the embodiment shown in FIGS.

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 40, 40a Plastic member 41 Body part 42 Bottom part 50 Blow molding die 60, 60a Inner label member 61 Body 62 Bottom 70 Composite preform

Claims (15)

In the manufacturing method of the composite container,
Preparing a preform made of polyolefin resin;
Providing a plastic member made of polyester resin on the outside of the preform;
And a step of blowing the preform and the plastic member together to expand the preform and the plastic member as a unit.   The method for manufacturing a composite container according to claim 1, wherein the preform includes a polyethylene resin or a polypropylene resin.   The method for manufacturing a composite container according to claim 1, wherein the plastic member is an outer contractive member having an effect of contracting the preform.   4. The method of manufacturing a composite container according to claim 3, wherein the outer contraction member contracts with respect to the preform when heat is applied. A step of providing an inner label member so as to surround the outside of the preform;
The method for manufacturing a composite container according to claim 1, wherein the plastic member is provided outside the inner label member. In composite preforms for composite containers,
A preform made of polyolefin resin,
A plastic member made of polyester resin provided so as to surround the outside of the preform,
The composite preform, wherein the plastic member is in close contact with the outside of the preform.   The composite preform according to claim 6, wherein the preform includes a polyethylene resin or a polypropylene resin.   The composite preform according to claim 6 or 7, wherein the plastic member is an outer contractive member having an effect of contracting the preform.   The composite preform according to claim 8, wherein the outer contraction member contracts with respect to the preform when heat is applied. An inner label member provided in close contact so as to surround the outside of the preform;
The composite preform according to any one of claims 6 to 9, wherein the plastic member is provided in close contact with the outside of the inner label member. In composite containers,
A container body made of polyolefin resin;
A plastic member made of polyester resin provided in close contact with the outside of the container body,
The composite container, wherein the container body and the plastic member are integrally expanded by blow molding.   The composite container according to claim 11, wherein the preform includes a polyethylene resin or a polypropylene resin.   The composite container according to claim 11, wherein the plastic member is an outer contractive member having a contracting action.   The composite container according to claim 13, wherein the outer contraction member contracts when heat is applied. An inner label member provided in close contact so as to surround the outside of the preform;
The composite container according to claim 11, wherein the plastic member is provided in close contact with the outer side of the inner label member.

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