JP6625313B2 - Blow molding method and composite preform - Google Patents

Description

  The present invention relates to a blow molding method and a composite preform for molding a composite container mainly containing a liquid content such as food and drink.

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

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

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

JP 2009-241526 A

  Conventionally, after filling a container with a content liquid, the container is sealed with a cap, and a label is provided around the container with a labeler. However, there is a problem that, by installing a labeler and applying a label, the manufacturing cost increases and the yield decreases.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a blow molding method and a composite preform that can eliminate a step of applying a label by a labeler.

  The present invention provides, in a blow molding method for molding a composite container, a step of preparing a preform made of a plastic material, and providing an inner label member outside the preform, and forming an outer contraction member outside the inner label member. And providing the preform, the inner label member and the outer shrink member by heating the preform, the inner label member adhered to the outer side of the preform, and the outer side of the inner label member. Producing a composite preform having an outer shrinkable member, heating the composite preform and inserting the composite preform into a blow mold, and subjecting the composite preform to blow molding in the blow mold. To expand the preform of the composite preform, the inner label member and the outer contraction member integrally A blow molding method characterized by comprising and.

  The present invention is characterized in that the preform has a mouth, a body, and a bottom, and the inner label member and the outer contraction member are provided so as to cover the body and the bottom of the preform. Is the way.

  The present invention is characterized in that the preform has a mouth, a body, and a bottom, and the inner label member and the outer contraction member are provided so as to cover a part of the body and the bottom of the preform. Blow molding method.

  The present invention is the blow molding method, wherein at least one of the outer contraction member and the inner label member has a gas barrier property or a light barrier property.

  The present invention is a blow molding method characterized in that at least one of an outer contraction member and an inner label member is previously designed or printed.

  The present invention is a blow molding method characterized in that at least one of the outer shrinking member and the inner label member is made of a material having a higher heat insulating property or a cold insulating property than the plastic material forming the preform.

  The present invention is the blow molding method, wherein the outer contraction member is made of a material that is less slippery than the plastic material constituting the preform.

  The present invention provides, in a composite preform, a preform made of a plastic material, an inner label member provided in close contact with the outside of the preform, and an outer contraction member provided in close contact with the outside of the inner label member. A composite preform comprising:

  According to the present invention, the preform has a mouth, a body, and a bottom, and the inner label member and the outer contraction member are provided so as to cover the body and the bottom of the preform. It is a reform.

  The present invention is characterized in that the preform has a mouth, a body, and a bottom, and the inner label member and the outer contraction member are provided so as to cover a part of the body and the bottom of the preform. Is a composite preform.

  The present invention is a composite preform characterized in that at least one of the outer contraction member and the inner label member has a gas barrier property or a light barrier property.

  The present invention is a composite preform characterized in that at least one of the outer contraction member and the inner label member has been previously designed or printed.

  The present invention is a composite preform characterized in that at least one of the outer contraction member and the inner label member is made of a material having a higher heat retaining property or a cold retaining property than a plastic material constituting the preform.

  The present invention is the composite preform, wherein the outer contraction member is made of a material that is less slippery than the plastic material forming the preform.

  ADVANTAGE OF THE INVENTION According to this invention, the preform of a composite preform, an inner label member, and an outer contraction member are expanded integrally by performing blow molding with respect to a composite preform in a blow molding die. Therefore, at the stage of manufacturing a composite container using a preform, an inner label member can be provided in advance in the composite container, and there is no need to provide a step of applying a label with a labeler after sealing the container.

FIG. 1 is a partial vertical sectional view showing a composite container. FIG. 2 is a horizontal sectional view showing the composite container (a sectional view taken along line II-II in FIG. 1). FIG. 3 is a vertical sectional view showing a composite preform according to one embodiment of the present invention. FIGS. 4A to 4G are schematic views showing a blow molding method according to an embodiment of the present invention. FIG. 5 is a partial vertical sectional view showing a modification of the composite container. FIG. 6 is a vertical sectional view showing a modification of the composite preform. FIGS. 7A to 7G are schematic views showing a modified example of the blow molding method.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 are views showing an embodiment of the present invention.

  First, an outline of a composite container manufactured by the blow molding method according to the present embodiment will be described with reference to FIGS. In addition, in this 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.

  The composite container 10A shown in FIGS. 1 and 2 is formed into a composite preform 70 (see FIG. 3) including a preform 10a, an inner label member 60, and an outer contraction member 40 by using a blow mold 50 as described later. On the other hand, by performing biaxial stretch blow molding, the preform 10a of the composite preform 70, the inner label member 60, and the outer contraction member 40 are integrally expanded and obtained.

  Such a composite container 10A includes a container body 10 made of a plastic material positioned inside, an inner label member 60 provided in close contact with the outside of the container body 10, and a close contact provided on the outside of the inner label member 60. And the outer contraction member 40 provided.

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

  On the other hand, the inner label member 60 is in close contact with the outer surface of the container main body 10 and is so close to the container main body 10 that it does not easily move or rotate.

  The outer contraction member 40 is in close contact with the outer surface of the container main body 10 and the outer surface of the inner label member 60, and is in close contact with the container main body 10 so as not to easily move or rotate.

  It is conceivable that at least a part of the outer contraction 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 outer contraction member 40 may be entirely translucent or transparent, or may have an opaque portion and a translucent or transparent portion (for example, a window). In the present embodiment, a case where the entire outer contraction member 40 is transparent will be described as an example.

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

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

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

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

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

  The thickness of the container body 10 in the body 20 is not limited to this, but can be reduced to, for example, about 50 μm to 250 μm. Further, the weight of the container body 10 is not limited to this, but can be 10 g to 20 g. By reducing the thickness of the container body 10 in this manner, the weight of the container body 10 can be reduced.

  Such a container body 10 can be manufactured by biaxially stretch-blow-molding a preform 10a (described later) manufactured by injection-molding a synthetic resin material. As the material of the preform 10a, that is, the material of the container body 10, it is preferable to use a thermoplastic resin, in particular, PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), and PEN (polyethylene naphthalate).

Further, the container body 10 can be formed as a multilayer molded bottle having two or more layers. The Sunawa Chi morphism-molded, for example, the intermediate layer MXD6, MXD6 + fatty acid salts, PGA (polyglycolic acid), the gas barrier properties and light shielding properties, such as EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate) preform 10a after the forming shape made of a resin (intermediate layer) 3 or more layers having, may be formed as a multilayer bottle having a gas barrier property and light shielding property by blow molding.

  Such a container body 10 may be composed of, for example, a bottle having a full capacity of 150 ml to 1500 ml.

  Next, the inner label member 60 will be described. The inner label member 60 is provided on the outside of the preform 10a as described later, is heated integrally with the preform 10a and the outer contraction member 40, and is obtained by biaxial stretch blow molding. .

  The inner label member 60 is attached to the outer surface of the container body 10 without being adhered thereto, and is tightly attached to the container body 10 so as not to move or rotate. As shown in FIG. 2, 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 12, the trunk 20, and the bottom 30 of the container main body 10 except for the mouth 11 and the neck 13. Thereby, desired characters, images, and the like can be given to the shoulder portion 12, the body portion 20, and the bottom portion 30 of the container body 10, and the composite container 10A can be provided with decorativeness or display information.

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

  The thickness of the inner label member 60 is not limited to this, but can be, for example, about 50 μm to 500 μm in a state where the inner label member 60 is attached to the container body 10.

  Next, the outer contraction member 40 will be described. The outer contracting member 40 is provided outside the inner label member 60 as described later, and is obtained by being integrally heated with the preform 10a and the inner label member 60 and subjected to biaxial stretch blow molding. .

  The outer contracting member 40 is attached to the outer surface of the inner label member 60 without being adhered thereto, and is tightly attached to the container body 10 so as not to move or rotate. As shown in FIG. 2, the outer contraction 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 outer contraction member 40 is provided so as to cover the shoulder 12, the trunk 20, and the bottom 30 of the container main body 10 except for the mouth 11 and the neck 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.

  Note that the outer contraction member 40 may be provided in the whole or a part of the container body 10 other than the mouth 11. For example, the outer contraction member 40 may be provided so as to cover the entirety of 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 the outer contraction members 40 is not limited to one, and a plurality of outer contraction members may be provided. For example, two outer contracting members 40 may be provided on the outer surface of the shoulder 12 and the outer surface of the bottom 30, respectively.

  As such an outer contraction member 40, any member having a function of contracting the preform 10a may be used. In addition, the outer contraction member 40 may have contractibility or elasticity itself, and may be contractable without adding an external action. Alternatively, the outer contraction member 40 may contract (for example, heat contract) with respect to the preform 10a when an external action (for example, heat) is applied.

  The thickness of the outer contraction member 40 is not limited to this, but may be, for example, about 50 μm to 500 μm in a state where the outer contraction member 40 is attached to the container body 10.

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

  As shown in FIG. 3, the composite preform 70 includes a preform 10 a made of a plastic material, an inner label member 60 provided in close contact with the outside of the preform 10 a, and a preform 10 a in close contact with the outside of the inner label member 60. And an outer contraction member 40 provided.

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

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

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

  Further, as the inner label member 60, various materials described below can be used.

  For example, the inner label member 60 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, the gas barrier property of the composite container 10A can be enhanced without using a multilayer preform or a preform containing a blend material as the preform 10a, and the content liquid can be prevented from being deteriorated by oxygen or water vapor. As such a material, it is conceivable to mix PE (polyethylene), PP (polypropylene), MXD-6 (nylon), or an oxygen absorbing material such as a fatty acid salt with these materials.

  Further, the inner label member 60 may be made of a material having a light barrier property against ultraviolet rays or the like. In this case, without using a multilayer preform or a preform containing a blend material as the preform 10a, the light barrier property of the composite container 10A can be enhanced, and the deterioration of the content liquid due to ultraviolet rays or the like can be prevented. As such a material, a blended material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered.

  Further, the inner label member 60 may be made of a material having a higher heat retaining property or a cold retaining property (a material having low thermal conductivity) than the plastic material constituting the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. Thereby, the heat retaining property or the cold retaining property of the composite container 10A is enhanced. Examples of such a material include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, and melamine resin.

  On the other hand, the outer contraction member 40 is attached to the outer surface of the inner label member 60 without being adhered thereto, and is tightly attached to the preform 10a so as not to move or rotate. The outer contraction member 40 is provided over the entire circumferential direction so as to surround the preform 10a, and has a substantially circular horizontal cross section.

  In this case, the inner label member 60 and the outer contraction member 40 are provided so as to cover the entire region of the body portion 20a except for the portion 13a corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a.

  Note that the inner label member 60 and the outer contraction member 40 may be provided in the entire area or a part of the area other than the mouth 11a. For example, the inner label member 60 and the outer contraction member 40 may be provided so as to cover the entire body 20a and the bottom 30a except for the mouth 11a. Further, the number of the inner label member 60 and the outer contraction member 40 is not limited to one, and a plurality of the inner label members 60 and the outer contraction members 40 may be provided. For example, two inner label members 60 and two outer contraction members 40 may be provided at two locations outside the trunk 20a.

  As such an outer contraction member 40, any member having a function of contracting the preform 10a may be used. In addition, as the outer contraction member 40, a member that contracts (for example, heat contracts) to the preform 10a when an external action (for example, heat) is applied is preferably used.

  Various materials can be used for the outer contraction member 40 as described below.

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

  Further, the outer contraction member 40 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, the gas barrier property of the composite container 10A can be enhanced without using a multilayer preform or a preform containing a blend material as the preform 10a, and the content liquid can be prevented from being deteriorated by oxygen or water vapor. For example, the outer contraction member 40 may be provided in the entire region of the shoulder 12, neck 13, trunk 20, and bottom 30 of the container body 10 to enhance the gas barrier properties of this portion. As such a material, it is conceivable to mix PE (polyethylene), PP (polypropylene), MXD-6 (nylon), or an oxygen absorbing material such as a fatty acid salt with these materials.

  Further, the outer contraction member 40 may be made of a material having a light barrier property against ultraviolet rays or the like. In this case, without using a multilayer preform or a preform containing a blend material as the preform 10a, the light barrier property of the composite container 10A can be enhanced, and the deterioration of the content liquid due to ultraviolet rays or the like can be prevented. For example, the outer contraction member 40 may be provided on the entire region of the shoulder 12, neck 13, body 20, and bottom 30 of the container body 10 to enhance the ultraviolet barrier property of this portion. As such a material, a blended material or a material obtained by adding a light-shielding resin to PET, PE, or PP can be considered.

  Further, the outer contraction member 40 may be made of a material having a higher heat retaining property or a cold retaining property (a material having low thermal conductivity) than the plastic material constituting the container body 10 (preform 10a). In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10 itself. Thereby, the heat retaining property or the cold retaining property of the composite container 10A is enhanced. For example, the outer contraction member 40 may be provided on all or a part of the body 20 of the container body 10 to enhance the heat retaining property or the cold retaining property 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 hot or too cold. Examples of such a material include foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, and melamine resin.

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

  Further, the outer contraction member 40 may be designed or printed in advance. For example, character information such as the name of the content liquid, the manufacturer, and the name of the raw material may be described in addition to the design and the product name.

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

  First, a preform 10a made of a plastic material is prepared (see FIG. 4A). In this case, for example, the preform 10a may be manufactured by an injection molding method using an injection molding machine (not shown).

  Next, the inside label member 60 is provided outside the preform 10a, and the outside contraction member 40 is provided outside the inside label member 60 (see FIG. 4B). In this case, the inner label member 60 has a bottomed cylindrical shape as a whole, and has a cylindrical body 61 and a bottom 62 connected to the body 61. The outer contraction member 40 has a bottomed cylindrical shape as a whole, and has a cylindrical body 41 and a bottom 42 connected to the body 41. The outer contraction member 40 is attached so as to cover the entire region of the body portion 20a except for the portion corresponding to the neck portion 13 of the container body 10 and the entire region of the bottom portion 30a. At least a part of the outer contraction member 40 may be translucent or transparent.

  In this case, the outer contracting member 40 may be provided in advance around the inner label member 60, and the inner label member 60 and the outer contracting member 40 may be integrally mounted on the outside of the preform 10a. Alternatively, the inner label member 60 may be provided outside the preform 10a, and then the outer contraction member 40 may be provided outside the inner label member 60.

  Next, the preform 10a, the inner label member 60, and the outer contraction member 40 are heated by the first heating device 55 (see FIG. 4C). At this time, the heating temperature of the preform 10a, the inner label member 60, and the outer contraction member 40 may be, for example, 50 ° C. to 150 ° C.

  When the outer contraction member 40 is heated, the outer contraction member 40 is thermally contracted and adheres to the outside of the preform 10a. Thus, a composite preform 70 having the preform 10a, the inner label member 60 adhered to the outside of the preform 10a, and the outer contraction member 40 adhered to the outside of the inner label member 60 is obtained (FIG. 4). (C)).

  As described above, the outer shrinking member 40 is heated and adhered to the outside of the preform 10a and the inner label member 60 in advance by using the first heating device 55, and the composite preform 70 is manufactured. And a series of steps (FIGS. 4 (d) to (g)) for manufacturing the composite container 10A by blow molding are performed at different locations (such as a factory). ).

  Next, the composite preform 70 is heated by the second heating device 51 (see FIG. 4D). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the second heating device 51 while rotating with the mouth 11a facing downward. The heating temperature of the preform 10a, the inner label member 60, and the outer contraction member 40 in this heating step may be, for example, 90 ° C. to 130 ° C.

  Subsequently, the composite preform 70 heated by the second heating device 51 is sent to the blow molding die 50 (see FIG. 4E).

  The composite container 10A is molded using the blow molding die 50. In this case, the blow mold 50 includes a pair of body molds 50a and 50b divided from each other and a bottom mold 50c (see FIG. 4E). In FIG. 4E, 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. 4 (f), after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed and sealed by the pair of body molds 50a and 50b and the bottom mold 50c. The blow molding die 50 is formed. Next, air is press-fitted into the preform 10a, and biaxial stretching blow molding is performed on the composite preform 70.

  Thereby, the container main body 10 is obtained from the preform 10a in the blow molding die 50. During this time, the body molds 50a and 50b are heated to 30 ° C to 80 ° C, and the bottom mold 50c is cooled to 5 ° C to 25 ° C. At this time, in the blow mold 50, the preform 10a of the composite preform 70, the inner label member 60, and the outer contraction member 40 are integrally expanded. Thus, the preform 10a, the inner label member 60, and the outer contraction member 40 are integrally formed into a shape corresponding to the inner surface of the blow molding die 50.

  In this way, a composite container 10A including the container body 10, the inner label member 60 provided on the outer surface of the container body 10, and the outer contraction member 40 provided outside the inner label member 60 is obtained.

  Next, as shown in FIG. 4 (g), the pair of body molds 50a and 50b and the bottom mold 50c are separated from each other, and the composite container 10A is taken out of the blow molding mold 50.

  As described above, according to the present embodiment, the preform 10 a of the composite preform 70, the inner label member 60, and the outer The contracting member 40 is integrally expanded to produce a composite container 10A including the container body 10, the inner label member 60, and the outer contracting member 40. For this reason, at the stage of manufacturing the composite container 10A using the preform 10a, the inner label member 60 can be provided in advance on the composite container 10A. Therefore, there is no need to provide a step of applying a label with a labeler after filling the content liquid into the composite container 10A and sealing the container. Thereby, the production cost for producing the final product can be suppressed. In addition, it is possible to prevent a decrease in yield when manufacturing a final product due to a defect of a labeler or the like.

  Further, according to the present embodiment, the preform 10a (container main body 10) and the outer contraction member 40 can be configured as separate members. Therefore, by appropriately selecting the type and shape of the outer contraction member 40, various functions and characteristics can be freely imparted to the composite container 10A.

  Further, according to the present embodiment, when manufacturing the composite container 10A, a general blow molding apparatus can be used as it is, so that it is necessary to prepare new molding equipment for manufacturing the composite container 10A. Absent.

EXAMPLES Next, specific examples of this embodiment will be described.

  First, a preform 10a composed of a 18.3 g PET single-layer preform was manufactured by an injection molding method.

  Next, the preform 10a is provided with the inner label member 60 and the outer contraction member 40, and is heated to 80 ° C., so that the composite preform having the preform 10a, the inner label member 60, and the outer contraction member 40 is formed. A reform 70 was produced. Subsequently, the composite preform 70 thus obtained was subjected to biaxial stretch blow molding to prepare a composite container 10A having a capacity of 180 mL. Polyolefin was used for the inner label member 60 and the outer contraction member 40.

Modified Example Next, a modified example of the present invention will be described with reference to FIGS. 5, 6, and 7A to 7G.

  The modified examples shown in FIGS. 5, 6, and 7 (a) to 7 (g) do not have a body and a bottom as the inner label member 60 and the outer contraction member 40, but have a cylindrical inner label member 60 and The outer contraction member 40 is used. As shown in FIG. 5, the inner label member 60 and the outer contraction member 40 extend from the shoulder 12 of the container body 10 to a lower portion of the body 20, but do not reach the bottom 30. Further, in the composite preform 70 shown in FIG. 6, the inner label member 60 and the outer contraction member 40 are closely adhered so as to cover only the trunk 20a of the preform 10a. It covers an area excluding a portion 13a corresponding to the neck portion 13 of the main body 10 and a portion corresponding to a lower portion of the body portion 20a.

  Other configurations in FIGS. 5, 6, and 7A to 7G are substantially the same as those in the embodiment shown in FIGS. In the modified examples shown in FIGS. 5, 6, and 7A to 7G, the same parts as those in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description will be omitted.

  In addition, 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.

DESCRIPTION OF SYMBOLS 10 Container main body 10A Composite container 10a Preform 11 Mouth 11a Mouth 12 Shoulder 13 Neck 20 Trunk 20a Trunk 30 Bottom 30a Bottom 40 Outer contraction member 50 Blow mold 60 Inner label member 70 Composite preform

Claims (14)

In a blow molding method for molding a composite container,
A step of preparing a preform which is an injection molded product made of polyethylene terephthalate,
The preform is composed of separate members, a step of preparing at least one longitudinal end is open ended tubular heat-shrinkable materials or Ranaru outer contraction member,
The cylindrical inner label member is provided on the outside of the preform so that the preform is fitted into the cylindrical inner label member and the cylindrical outer contraction member, and the outer contraction is provided on the outer side of the inner label member. Mounting the member;
By heating the preform, the inner label member, and the outer contraction member by the first heating device, the outer contraction member is thermally contracted, and the preform, the inner label member adhered to the outside of the preform, and the inner label member A step of producing a composite preform having an outer contraction member provided in close contact with the outside of the
Heating the composite preform by the second heating device and inserting it into the blow molding mold;
Subjecting the composite preform to blow molding in a blow mold so as to integrally expand the preform, the inner label member and the outer contraction member of the composite preform. Method.   2. The blower according to claim 1, wherein the preform has a mouth, a body, and a bottom, and the inner label member and the outer contraction member are provided to cover the body and the bottom of the preform. Molding method.   The preform has a mouth, a trunk, and a bottom, and the inner label member and the outer contraction member are provided so as to cover a part of the trunk and the bottom of the preform. 2. The blow molding method according to 1.   The blow molding method according to any one of claims 1 to 3, wherein at least one of the outer contraction member and the inner label member has a light barrier property.   The blow molding method according to any one of claims 1 to 4, wherein at least one of the outer contraction member and the inner label member is designed or printed in advance.   The blow according to any one of claims 1 to 5, wherein at least one of the outer contraction member and the inner label member is made of a material having a higher heat retaining property or a cold retaining property than polyethylene terephthalate constituting the preform. Molding method.   The blow molding method according to any one of claims 1 to 6, wherein the outer contraction member is made of a material that is less slippery than polyethylene terephthalate constituting the preform. In a composite preform,
A preform which is an injection molded product made of polyethylene terephthalate,
An inner label member provided in close contact with the outside of the preform,
Provided in close contact with the outside of the inner closure flap, and a wood charge or Ranaru outer shrinkable member having a heat-shrinkable,
The outer contraction member has a cylindrical portion that is open at least at one end in the longitudinal direction,
The outer contraction member is attached to the outer surface of the preform and the outer surface of the inner label member without being adhered thereto, and is tightly adhered to the outside of the preform in a state of being thermally shrunk to the preform. Composite preform.   9. The composite according to claim 8, wherein the preform has a mouth, a body, and a bottom, and the inner label member and the outer contraction member are provided so as to cover the body and the bottom of the preform. preform.   The preform has a mouth, a trunk, and a bottom, and the inner label member and the outer contraction member are provided so as to cover a part of the trunk and the bottom of the preform. 8. The composite preform according to 8.   The composite preform according to any one of claims 8 to 10, wherein at least one of the outer contraction member and the inner label member has a light barrier property.   The composite preform according to any one of claims 8 to 11, wherein at least one of the outer contraction member and the inner label member has been designed or printed in advance.   The composite according to any one of claims 8 to 12, wherein at least one of the outer contraction member and the inner label member is made of a material having a higher heat retaining property or a cold retaining property than polyethylene terephthalate constituting the preform. preform.   The composite preform according to any one of claims 8 to 13, wherein the outer contraction member is made of a material that is less slippery than polyethylene terephthalate constituting the preform.

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