Device and method for manufacturing resin container

Abstract

An apparatus for manufacturing a resin container is provided with: one injection molding unit for injection-molding a bottomed cylindrical preform from a first resin material; the other injection molding part is used for injection molding of the additional structure by using a second resin material; a blow molding unit for manufacturing a resin container by blow molding the preform, in which the additional structure has been integrated, in a state in which heat is retained during injection molding; and a transport body that moves in the order from the one injection molding unit to the other injection molding unit, or in the order from the other injection molding unit to the one injection molding unit, and transports the preform, in which the additional structure has been integrated, to the blow molding unit.

Description

Technical Field

[0001] The present invention relates to a manufacturing apparatus and a manufacturing method for resin containers. Background Art

[0002] Conventionally, as one of the manufacturing apparatuses for resin containers (hereinafter, also simply referred to as containers), a hot parison type blow molding apparatus is known. The hot parison type blow molding apparatus is configured to blow mold a container by utilizing the heat retained during the injection molding of a preform. Compared with the cold parison type, it is advantageous in that it can manufacture containers with various shapes and excellent appearance aesthetics.

[0003] In addition, as one type of the above-mentioned container, a container in which additional structures such as a handle, a sling, and a clip-type lid are integrated with the container body is also known. In the case of manufacturing such a container using a hot parison type blow molding apparatus, a method of insert molding a prefabricated handle or the like during blow molding is known (for example, refer to Patent Documents 1 and 2). In addition, a method of simultaneously molding the corresponding parts of the additional structures during the injection molding of the preform has also been proposed (for example, refer to Patent Documents 3 to 6). It should be noted that a sling, a clip-type lid, or the like may be subsequently attached to the blow molded container body.

[0004] In addition, as another type of the above-mentioned container, a multi-chamber container is known, which is integrated by welding a plurality of containers each having an opening at the main body portion and can accommodate different types of contents respectively (for example, refer to Patent Documents 7 to 11).

[0005] Prior Art Documents Patent Documents Patent Document 1: Japanese Patent No. 3616484 Patent Document 2: Japanese Patent Application Laid-Open No. 8-169059 Patent Document 3: Japanese Patent Application Laid-Open No. 2009-529437 Patent Document 4: International Publication No. 00 / 051902 Patent Document 5: Japanese Patent No. 3098412 Patent Document 6: Japanese Patent No. 4425018 Patent Document 7: Japanese Patent No. 4044507 Patent Document 8: Japanese Patent No. 4176598 Patent Document 9: Japanese Patent No. 6120703 Patent Document 10: Japanese Patent Application Laid-Open No. 5-001129 Patent Document 11: Japanese Patent No. 6621632 Summary of the Invention

[0006] Technical problem to be solved by the invention In the manufacture of a container in which an additional structure is integrated with a container body, when integrating an additional structure separately manufactured from the container body with the container body, in addition to the equipment for manufacturing the container body, special processes and equipment are required for installing the additional structure. Therefore, the manufacturing process of the container becomes complicated and the manufacturing equipment of the container also becomes large-sized. In addition, when forming a corresponding part of the additional structure during injection molding of a preform, since the additional structure and the container body are made of the same material, there are restrictions, and the difficulty of manufacturing the container also becomes high.

[0007] On the other hand, in the conventional manufacturing method of a multi-chamber container based on the heat preform method, it can be manufactured when the colors, materials, shapes, etc. of the multiple containers constituting the multi-chamber container are the same. However, in the above manufacturing method, it is impossible to cope with the case where the characteristics such as colors, materials, shapes, etc. of the multiple containers constituting the multi-chamber container are different.

[0008] Therefore, the present invention has been completed in view of such technical problems, and an object thereof is to provide a manufacturing apparatus that can mold an additional structure and a container body using different materials, and can relatively easily manufacture a container in which an additional structure is integrated with a container body, or a resin multi-chamber container in which multiple containers with different characteristics are integrated.

[0009] Technical solution for solving the technical problem A manufacturing apparatus for a resin container according to one aspect of the present invention manufactures a resin container having a container body and an additional structure integrated with the container body. The manufacturing apparatus includes: one injection molding part that injection-molds a bottomed cylindrical preform using a first resin material; the other injection molding part that injection-molds an additional structure using a second resin material; a blow molding part that blow-molds the preform integrated with the additional structure in a state of retaining heat during injection molding to manufacture a resin container; and a conveyor that moves in the order from one injection molding part to the other injection molding part, or in the order from the other injection molding part to one injection molding part, and conveys the preform integrated with the additional structure to the blow molding part.

[0010] The manufacturing apparatus for a resin multi-chamber container according to other aspects of the present invention manufactures a resin multi-chamber container in which a first container and a second container having different characteristics are integrated. The manufacturing apparatus includes: a first injection molding section that injection molds a bottomed cylindrical first preform made of resin; a second injection molding section that injection molds a bottomed cylindrical second preform made of resin and having characteristics different from those of the first preform; and a blow molding section that manufactures a multi-chamber container including a first container blow-molded from the first preform and a second container blow-molded from the second preform. The blow molding section disposes the first preform and the second preform in the same mold in a state where they each retain heat during injection molding, and integrally forms the first container and the second container in the mold by simultaneously blow molding the first preform and the second preform.

[0011] Advantages of the Invention According to one aspect of the present invention, there is provided a manufacturing apparatus that can mold an additional structure and a container body using different materials, and can relatively easily manufacture a container in which the additional structure and the container body are integrated, or can relatively easily manufacture a resin multi-chamber container in which a plurality of containers having different characteristics are integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. is a view showing a first example of a preform and a container according to the first embodiment.

[0013] Figure 2 FIG. is a view showing a second example of a preform and a container according to the first embodiment.

[0014] Figure 3 FIG. is a view showing a third example of a preform and a container according to the first embodiment.

[0015] Figure 4 FIG. schematically shows the structure of a blow molding apparatus according to the first embodiment.

[0016] Figure 5 FIG. schematically shows an example of a manufacturing process of a container according to the first embodiment.

[0017] Figure 6 FIG. is a flowchart showing the steps of a manufacturing method of a container according to the first embodiment.

[0018] Figure 7 FIG. is a view showing a structural example of a resin multi-chamber container according to the second embodiment.

[0019] Figure 8 FIG. schematically shows an example of a manufacturing process of a multi-chamber container according to the second embodiment.

[0020] Figure 9 is continuous with Figure 8 diagrams. Detailed implementation mode

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0022] In the embodiments, for the sake of easy understanding of the description, structures and elements other than the main parts of the present invention are simplified or omitted in the description. In addition, in the accompanying drawings, the same reference numerals are given to the same elements. It should be noted that the shapes, sizes, etc. of the elements shown in the accompanying drawings are schematically represented, and thus do not represent the actual shapes, sizes, etc.

[0023] (First Embodiment) (Structural example of preform) First, with reference to Figures 1 to 3 , a structural example of the preform 10 according to the first embodiment will be described. Here, the containers manufactured in the first embodiment are all constituted by integrating an additional structure with the container body 1. In Figure 1 (a) of Figure 2 (a) of Figure 3 (a) of

[0024] Figure 1 , the outlines of the container bodies 1 formed by blow molding the preform 10 are respectively indicated by double-dot dash lines. Figure 1 (a) of Figure 1 is a front view of the preform 10 of the first example,

[0025] (b) of

[0026] The overall shape of the preform 10 is a bottomed cylindrical shape with one end open and the other end closed. The preform 10 includes: a body portion 12 formed in a cylindrical shape; a bottom portion 13 closing the other end side of the body portion 12; and a neck portion 11 formed at an opening 11a on one end side of the body portion 12. In the second and third examples described later, the shape of the preform 10 is the same, and thus repeated descriptions are omitted.

[0027] The handle body 22 is disposed at a given position in the circumferential direction of the preform 10 and is integrally formed in a cantilever state on the mounting base 21. The handle body 22 is shaped such that it bends outside the mounting base 21 and extends toward the bottom side of the preform 10, and is sized to be easily gripped by a human hand. In addition, the front end (the end opposite to the mounting base 21) of the handle body 22 constitutes an engaging portion 22a that engages with the container body 1 during blow molding.

[0028] Figure 2 It is a view showing a second example of the preform 10. The second example shows the preform 10 applied in the case where the sling 20A is provided as an additional structure of the container body 1. Figure 2 (a) of is a front view of the preform 10 of the second example, Figure 2 and (b) of is a top view of the preform 10 of the second example.

[0029] The sling 20A is mounted on the lower side of the neck 11 of the preform 10 of the second example. The sling 20A is injection molded from a resin material different from that of the preform 10 and has an annular mounting base 21 and a flat sling body 23. The structure of the mounting base 21 is the same as that of the first example described above.

[0030] The sling body 23 is formed to protrude outward from the mounting base 21. The sling body 23 has a gripping portion 24 provided on the free end side opposite to the mounting base 21, and a connecting portion 25 that connects the gripping portion 24 and the mounting base 21. The gripping portion 24 is an annular frame and is used, for example, when a person's finger passes through the gap to convey the container body 1.

[0031] Figure 3 It is a view showing a third example of the preform 10. The third example shows the preform 10 applied in the case where the lid portion 20B is provided as an additional structure of the container body 1. Figure 3 (a) of is a front view of the preform 10 of the third example, Figure 3 and (b) of is a top view of the preform 10 of the third example.

[0032] The lid portion 20B is mounted on the lower side of the neck 11 of the preform 10 of the third example. The lid portion 20B is injection molded from a resin material different from that of the preform 10 and has an annular mounting base 21, a lid body 26, and a hinge portion 27. The structure of the mounting base 21 is the same as that of the first example described above.

[0033] The lid body 26 is a bottomed cylindrical lid having dimensions corresponding to the neck 11, and can close the opening 11a by covering the neck 11. The hinge portion 27 is provided between the mounting base 21 and the lid body 26, and elastically deforms to connect the lid body 26 to the neck 11 in an openable and closable manner.

[0034] (Description of the container manufacturing device) Figure 4 This is a diagram schematically showing the structure of the blow molding device 30 of the first embodiment. The blow molding device 30 of the first embodiment is an example of a container manufacturing device, and adopts the hot parison method (also called the one-stage method). In this hot parison method, the preform 10 is not cooled to room temperature, and the container is blow molded using the heat retained during injection molding (internal heat).

[0035] In the following description, a manufacturing example of a container in which the preform 10 is injection molded in the first example and has a handle 20 as an additional structure will be described. In addition, in the following description, as an example, the case where the additional structure is injection molded after the preform 10 is injection molded will be described.

[0036] The blow molding device 30 includes: a first injection molding part 31, a first temperature adjustment part 32, a second injection molding part 33, a second temperature adjustment part 34, a blow molding part 35, a take-out part 36, and a conveying mechanism 37. The first injection molding part 31, the first temperature adjustment part 32, the second injection molding part 33, the second temperature adjustment part 34, the blow molding part 35, and the take-out part 36 are arranged at positions that rotate a given angle (for example, 60 degrees) each time around the conveying mechanism 37.

[0037] (Conveying mechanism 37) The conveying mechanism 37 includes a transfer plate 37a that moves by rotating around an axis perpendicular to the plane of the paper of Figure 4 . One or more neck molds 37b for holding the neck 11 of the preform or the container are respectively arranged on the transfer plate 37a at given intervals ( Figure 4 not shown in the figure). It should be noted that the transfer plate 37a and the neck mold 37b are examples of conveying bodies.

[0038] The conveying mechanism 37 rotates the transfer plate 37a to sequentially convey the preform 10 held by the neck mold 37b to the first injection molding part 31, the first temperature adjustment part 32, the second injection molding part 33, the second temperature adjustment part 34, the blow molding part 35, and the take-out part 36. It should be noted that the conveying mechanism 37 can also lift the transfer plate 37a and perform operations related to closing and opening (demolding) of the first injection molding part 31 and the second injection molding part 33.

[0039] (First injection molding part 31) The first injection molding part 31 includes an injection cavity mold 40 and an injection core mold 41, and manufactures the preform 10. The first injection molding part 31 is an example of one of the injection molding parts. In addition, as Figure 2As shown, a first injection device 38 is connected to the first injection molding section 31, and the first injection device 38 supplies a first resin material that is the material for the preform 10.

[0040] Here, the first resin material is a thermoplastic synthetic resin and can be appropriately selected according to the specifications of the manufactured container body 1. As specific types of materials, for example, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PCTA (polycyclohexanedimethylene terephthalate), Tritan (Tritan (registered trademark): copolyester manufactured by Eastman Chemical Company), PP (polypropylene), PE (polyethylene), PC (polycarbonate), PES (polyethersulfone), PPSU (polyphenylsulfone), PS (polystyrene), COP / COC (cyclic olefin polymer), PMMA (polymethyl methacrylate: acrylic), PLA (polylactic acid), etc. can be cited. In addition, additive materials such as coloring materials can also be added to the first resin material.

[0041] The injection cavity mold 40 is a mold that defines the outer peripheral shape of the main body portion 12 and the bottom portion 13 of the preform 10. A resin supply nozzle 43 is connected to the lower side of the injection cavity mold 40, and the resin supply nozzle 43 introduces the first resin material from the first injection device 38. The injection core mold 41 is a mold that is inserted into the injection cavity mold 40 and the neck mold 37b, and it defines the inner peripheral shape of the preform 10. In addition, the neck mold 37b functions as a mold that defines the outer peripheral shape of the neck 11 of the preform 10.

[0042] Figure 5 Figure (a) shows the injection molding process in the first injection molding section 31. In the first injection molding section 31, a mold space for the preform 10 is formed by closing the injection cavity mold 40, the injection core mold 41, and the neck mold 37b. Then, the first resin material is injected from the first injection device 38 into the above-mentioned mold space via the resin supply nozzle 43, and thus the preform 10 is manufactured in the first injection molding section 31.

[0043] In addition, when the first injection molding section 31 is opened, the neck mold 37b of the conveying mechanism 37 is not opened, and the preform 10 is directly held and conveyed. The number of preforms 10 simultaneously molded by the first injection molding section 31 (that is, the number of containers that can be simultaneously molded by the blow molding device 30) can be appropriately set.

[0044] (First Temperature Adjusting Section 32) The first temperature adjustment unit 32 includes a mold unit (not shown). Before the preform 10 is conveyed to the second injection molding unit 33, the first temperature adjustment unit 32 equalizes the temperature of the preform 10, removes temperature deviation, and adjusts the temperature distribution of the preform 10 to a given state. In addition, the first temperature adjustment unit 32 may also have a function of cooling the preform 10 in a high-temperature state after injection molding.

[0045] The mold unit of the first temperature adjustment unit 32 may, for example, include a heating tank that houses the preform 10 and heats the preform 10 in a non-contact manner from the surroundings; or it may include a temperature adjustment mold that blows compressed air into the preform 10 for cooling and temperature adjustment. For example, the above-mentioned temperature adjustment mold has a cavity mold (temperature adjustment tank) capable of housing the preform 10 and an air introduction member that abuts against the neck 11 and introduces compressed air into the preform 10.

[0046] (Second injection molding unit 33) The second injection molding unit 33 includes an injection mold 50 for injection molding the handle 20. The second injection molding unit 33 is an example of the other injection molding unit. The injection mold 50 is, for example, a split mold that is split along a split surface in the longitudinal direction of the preform 10 and has a mold space corresponding to the handle 20. It should be noted that when the additional structure to be injection molded is the above-mentioned sling 20A or cover portion 20B, the split surface of the injection mold 50 is appropriately changed.

[0047] In addition, as Figure 2 shown, a second injection device 39 is connected to the second injection molding unit 33. The second injection device 39 supplies a second resin material as the material of the handle 20 and injects the second resin material into the mold space of the injection mold 50. The second resin material is a thermoplastic synthetic resin, and the specific type of the material is the same as the description of the first resin material. The second resin material can be appropriately selected according to the specifications of the manufactured handle 20.

[0048] Figure 5 Figure (b) of shows the injection molding process in the second injection molding unit 33. In the second injection molding unit 33, injection molding of the second resin material is performed with the preform 10 housed in the injection mold 50. As a result, the handle 20 is formed under the neck of the preform 10. It should be noted that when the mold of the second injection molding unit 33 is opened, the neck mold 37b of the conveying mechanism 37 is not opened either, and the preform 10 is held and conveyed. In addition, the handle 20 is held to the preform 10 by welding, engagement, etc. during injection molding, and thus is conveyed together with the preform 10.

[0049] (Second temperature adjustment unit 34) The second temperature adjustment unit 34 includes a mold unit (not shown). The second temperature adjustment unit 34 functions to cool the handle 20 conveyed from the second injection molding unit 33 to a given temperature. Thereby, deformation of the handle 20 due to thermal shrinkage after injection molding can be suppressed. In addition, the second temperature adjustment unit 34 also adjusts the temperature of the preform 10 to a temperature suitable for final blow molding (for example, about 90°C to 105°C).

[0050] It should be noted that the mold unit of the second temperature adjustment unit 34 can be either a structure with a heating tank or a structure with a temperature adjustment mold for blowing compressed air into the preform 10, as long as it can locally cool the handle 20.

[0051] (Blow molding unit 35) The blow molding unit 35 blow-molds the preform 10 with the handle 20 conveyed from the second temperature adjustment unit 34 to manufacture a container with the handle 20. The blow molding unit 35 includes a blow cavity mold 61, a bottom mold 62, a fitting core (blow core) 63, an air inlet / outlet member 64, and an extension rod 65.

[0052] The blow cavity mold 61 is a pair of split molds that define the shape of the main body portion of the container body 1. Inside the blow cavity mold 61, the preform 10 is accommodated in a state where the handle 20 is positioned. In addition, the bottom mold 62 is a mold that defines the shape of the bottom of the container body 1.

[0053] It should be noted that when the additional structure provided on the container is the above-mentioned sling 20A or lid portion 20B, in the blow cavity mold 61, a receiving portion (not shown) for receiving the sling 20A or lid portion 20B is provided outside the mold space. By receiving the sling 20A and lid portion 20B in this receiving portion, the blow molding of the container body 1 can be performed without involving the sling 20A and lid portion 20B.

[0054] The fitting core 63 is a mold inserted inside the neck mold 37b. In a state where it is inserted into the neck mold 37b, it is in close contact with the inner circumference or upper end surface of the neck 11 of each preform 10 and maintains airtightness with the preform 10 during blow molding. In the fitting core 63, an opening is formed at the position of the opening 11a of the preform 10, and the air inlet / outlet member 64 and the extension rod 65 are inserted through this opening.

[0055] The air inlet / outlet member 64 is a cylindrical member, and an extension rod 65 that can advance and retreat along the axial direction is concentrically arranged inside it. In addition, the gap between the fitting core 63 and the air inlet / outlet member 64 and the inside of the air inlet / outlet member 64 constitute a supply path and an exhaust path for compressed air (blow air).

[0056] Figure 5Figure (c) shows the blow molding process in the blow molding section 35. The blow molding section 35 blows compressed air into the preform 10 while stretching the preform 10 to perform blow molding of the container body 1. It should be noted that when shaping the container body 1, the front end of the handle 20 engages with the container body 1, whereby the handle 20 and the container body 1 are integrated.

[0057] (Taking-out section 36) The taking-out section 36 is configured to release the neck 11 of the handled container manufactured by the blow molding section 35 from the neck mold 37b and take out the container to the outside of the blow molding apparatus 30.

[0058] (Explanation of the method for manufacturing a container) Next, the method for manufacturing a container using the blow molding apparatus 30 according to the first embodiment will be described. Figure 5 It is a flowchart showing the steps of the method for manufacturing a container.

[0059] (Step S101: First injection molding process) First, as Figure 5 shown in Figure (a), in the first injection molding section 31, a first resin material is injected from the first injection device 38 into the mold space formed by the injection cavity mold 40, the injection core mold 41, and the neck mold 37b to manufacture the preform 10.

[0060] After that, when the first injection molding section 31 opens the mold, the transfer plate 37a of the conveying mechanism 37 moves in a manner of rotating a given angle, and the preform 10 held by the neck mold 37b is conveyed to the first temperature adjustment section 32 while maintaining the heat retained during injection molding.

[0061] (Step S102: First temperature adjustment process) Next, the preform 10 is housed in the mold unit of the first temperature adjustment section 32 to adjust the temperature distribution (equalization of temperature, removal of temperature deviation). After that, the transfer plate 37a moves in a manner of rotating a given angle, and the neck mold 37b is conveyed to the second injection molding section 33 while maintaining the preform 10.

[0062] (Step S103: Second injection molding process) Next, the neck mold 37b descends relative to the injection mold 50 of the second injection molding section 33, and the injection mold 50 is closed with the preform 10 housed therein. Then, as Figure 5 shown in Figure (b), a second resin material is injected from the second injection device 39 into the mold space of the injection mold 50 to form the handle 20.

[0063] After that, when the second injection molding section 33 is opened, the transfer plate 37a moves by rotating a given angle, and the preform 10 held by the neck mold 37b and the handle 20 welded to the preform 10 are conveyed to the second temperature adjustment section 34.

[0064] (Step S104: Second temperature adjustment process) Next, the preform 10 and the handle 20 are received in the second temperature adjustment section 34, and at the same time, the handle 20 is cooled and the temperature of the preform 10 is adjusted to be close to the temperature suitable for final blow molding. After that, the transfer plate 37a moves by rotating a given angle, and the temperature-adjusted preform 10 and handle 20 are conveyed to the blow molding section 35.

[0065] (Step S105: Blow molding process) Next, in the blow molding section 35, blow molding of the container is performed.

[0066] First, the blow molding cavity mold 61 is closed, and the preform 10 and the handle 20 are respectively received in the mold space. Then, by lowering the fitting core 63, the air introduction / export member 64 and the extension rod 65 are inserted into the preform 10. Next, the extension rod 65 is lowered to press the bottom 13 of the preform 10 from the inner surface, and longitudinal axis extension is performed as needed. After that, the preform 10 is transversely extended by supplying blow molding air from the air introduction / export member 64.

[0067] As Figure 5 shown in (c) of

[0068] (Step S106: Container removal process) When the blow molding is completed, the blow molding cavity mold 61 is opened. Thus, the container can be moved from the blow molding section 35.

[0069] Next, the transfer plate 37a moves by rotating a given angle, and the container is conveyed to the removal section 36. In the removal section 36, the neck 11 of the container is released from the neck mold 37b, and the container is removed to the outside of the blow molding apparatus 30.

[0070] Thus, one cycle in the manufacturing method of the container ends. After that, by moving the transfer plate 37a by rotating a given angle, the above-described steps S101 to S106 are repeated. It should be noted that when the blow molding apparatus 30 is operating, six groups of containers with a time difference of one process each are manufactured in parallel.

[0071] In addition, in terms of the structure of the blow molding apparatus 30, the times for the first injection molding process, the first temperature adjustment process, the second injection molding process, the second temperature adjustment process, the blow molding process, and the container removal process are all of the same length. Similarly, the conveyance times between the respective processes are also of the same length.

[0072] Hereinafter, the effects of the first embodiment will be described.

[0073] The blow molding apparatus 30 of the first embodiment injection-molds a preform 10 using the first injection molding section 31, and injection-molds a handle 20 using a second injection molding section 33 different from the first injection molding section 31. The handle 20 is an additional structure integrated with the preform 10. Then, the preform 10 is blow-molded by the blow molding section 35 to be shaped into a container body 1, and a container in which the additional structure (handle 20) and the container body 1 are integrated is manufactured.

[0074] In the first embodiment, the processes of injection molding the preform 10, injection molding the additional structure, and blow molding the container body 1 are continuously performed, and thus a container in which the additional structure and the container body are integrated can be easily manufactured. In addition, in the first embodiment, since the preform 10 and the additional structure are separately manufactured using different injection molding sections, the container body 1 shaped from the preform 10 and the additional structure can be molded using different materials.

[0075] (Modification of the First Embodiment) In the above-described first embodiment, an example in which the preform 10 is first injection-molded using the first injection molding section 31 and then the additional structure is injection-molded using the second injection molding section 33 has been described. However, in the above-described first embodiment, the additional structure may be first injection-molded using the first injection molding section 31, and then the preform 10 may be injection-molded in an integrated manner with the additional structure using the second injection molding section 33. In this case, the first injection molding section 31 functions as the other injection molding section, and the second injection molding section 33 functions as one injection molding section.

[0076] In the case of first injection-molding the additional structure, for example, the mounting base of the additional structure may be held and conveyed using a neck mold 37b, and a resin material may be injected into the inside of the mounting base of the additional structure by a subsequent injection molding section to manufacture the preform 10.

[0077] In addition, in the above-described first embodiment, an example of forming an additional structure under the neck of the preform 10 has been described. However, the formation position of the additional structure is not limited to the above case. For example, the additional structure may be formed in a manner directly connected to the neck 11. Further, the additional structure is not limited to a handle, a sling, or a lid connected to the container body, but broadly includes the concept of a resin container and a structure connected thereto. For example, the additional structure may also be a structure such as a label (sign) or a band connecting a resin container to a resin container.

[0078] (Second Embodiment) (Structural Example of Multi-chamber Container) First, with reference to Figure 7 , a structural example of a resin multi-chamber container according to the second embodiment will be described. Figure 7 FIG. (a) is a front view of a resin multi-chamber container, Figure 7 FIG. (b) is a top view of a resin multi-chamber container.

[0079] The multi-chamber container 110 is constituted by integrating a first container 110a and a second container 110b each formed of a thermoplastic resin. The first container 110a and the second container 110b each have: a neck 111 having a mouth portion 111a at the upper end; a cylindrical body portion 112 connected to the neck 111; and a bottom portion 113 continuous from the body portion 112. Threaded teeth 111b for removing the lid are formed on each neck 111. In addition, the first container 110a and the second container 110b are each configured as an independent container and can store contents (for example, liquids such as cosmetics, pharmaceuticals, beverages, seasonings, etc.) separately.

[0080] As an example, Figure 7 the first container 110a and the second container 110b shown are formed in substantially the same shape and are integrated into the multi-chamber container 110 by welding the mutually opposed surfaces of the body portions 12 over the entire surface. The first container 110a and the second container 110b of the multi-chamber container 110 are integrated in a state where the necks 111 are arranged in the same direction.

[0081] In addition, Figure 7 the first container 110a and the second container 110b of the multi-chamber container 110 shown are each formed of a different material. As an example, the first container 110a and the second container 110b may be each formed of a different resin material or may be formed of the same resin material with different compositions of coloring agents. Hereinafter, the resin material forming the first container 110a will also be referred to as the first resin material, and the resin material forming the second container 110b will also be referred to as the second resin material.

[0082] As described above, by forming the first container 110a and the second container 110b of the multi-chamber container 110 from different materials, for example, it is possible to cause an appearance change such as a color change between the first container 110a and the second container 110b, thereby improving the aesthetics of the multi-chamber container 110 and the distinguishability between the first container 110a and the second container 110b. In addition, by forming the first container 110a and the second container 110b of the multi-chamber container 110 from different materials, it is possible to change the physical properties of the first container 110a and the second container 110b according to the specifications of the stored content, etc., and thereby improve the function of the multi-chamber container 110 as well.

[0083] In addition, in Figure 7 a multi-chamber container 110 is shown in which the shapes of the two containers are substantially the same shape and the color, material, etc. are different as characteristics of the first container 110a and the second container 110b. However, for example, as one of the characteristics of the first container 110a and the second container 110b, the neck shapes, body shapes, etc. of the two containers may also be different. It should be noted that when the neck shapes, body shapes, etc. are different between the first container 110a and the second container 110b, the first resin material and the second resin material may be the same.

[0084] (Description of manufacturing apparatus for multi-chamber container) The basic structure of the blow molding apparatus applied to the manufacture of a resin multi-chamber container in the second embodiment is the same as the structure of the blow molding apparatus 30 of the first embodiment shown in Figure 4 and includes a first injection molding section 31, a first temperature adjustment section 32, a second injection molding section 33, a second temperature adjustment section 34, a blow molding section 35, a take-out section 36, and a conveying mechanism 37. In the following description, in the blow molding apparatus of the second embodiment, parts different from those of the first embodiment will be described, and redundant descriptions of parts the same as those of the first embodiment will be appropriately omitted.

[0085] (Conveying mechanism 37) In the conveying mechanism 37 of the second embodiment, on the transfer plate 37a, one or more neck molds 137b for holding the preform or the neck 111 of the container are respectively arranged at given intervals of angles. It should be noted that the transfer plate 37a and the neck mold 137b are examples of conveying bodies.

[0086] For example, as in Figure 8 , Figure 9As shown, the neck mold 137b has a first holding portion 137b1 that holds the neck 111 of the first container 110a and a second holding portion 137b2 that holds the neck 111 of the second container 110b. It is possible to hold the two necks 111 of the multi-chamber container 110 using a single neck mold 137b. It should be noted that the structure of the neck mold 137b is not limited to the above structure, and it is also possible to separately and independently provide a neck mold for holding the neck 111 of the first container 110a and a neck mold for holding the neck 111 of the second container 110b, and use two neck molds to hold each neck 111 of the multi-chamber container 110.

[0087] The conveying mechanism 137 rotates the transfer plate 37a to sequentially convey the preform 115a, 115b or the multi-chamber container 110 held by the neck mold 137b to the first injection molding section 31, the first temperature adjustment section 32, the second injection molding section 33, the second temperature adjustment section 34, the blow molding section 35, and the take-out section 36. It should be noted that the conveying mechanism 37 can also lift and lower the transfer plate 37a, and also performs operations related to closing and opening (demolding) the first injection molding section 31 and the second injection molding section 33.

[0088] (First Injection Molding Section 31) The first injection molding section 31 includes an injection cavity mold 140 and an injection core mold 141, and manufactures the first preform 115a corresponding to the first container 110a. In addition, a first injection device 38 for supplying the first resin material is connected to the first injection molding section 31. Here, the first resin material is a thermoplastic synthetic resin, and can be appropriately selected according to the specifications of the first container 110a. The type of the first resin material is the same as that of the first embodiment.

[0089] The injection cavity mold 140 is a mold that defines the outer peripheral shape of the main body portion and the bottom of the first preform 115a. A resin supply nozzle 143 is connected to the lower side of the injection cavity mold 140, and the resin supply nozzle 143 introduces the first resin material from the first injection device 38. The injection core mold 141 is a mold that is inserted into the injection cavity mold 140 and the first holding portion 137b1 of the neck mold 137b, and defines the inner peripheral shape of the first preform 15a. In addition, the first holding portion 137b1 of the neck mold 137b functions as a mold that defines the outer peripheral shape of the neck 111 of the first preform 15a.

[0090] Figure 8Figure (a) shows the injection molding process in the first injection molding section 31. In the first injection molding section 31, a mold space for the first preform 115a is formed by closing the above-mentioned injection cavity mold 140, injection core mold 141, and neck mold 137b. Then, the first resin material is injected into the above-mentioned mold space from the first injection device 38 via the resin supply nozzle 143, thereby manufacturing the first preform 115a in the first injection molding section 31.

[0091] In addition, when the first injection molding section 31 is opened, the neck mold 137b of the conveying mechanism 37 is not opened either, and the first preform 115a is directly held and conveyed. The number of the first preforms 115a simultaneously molded by the first injection molding section 31 (i.e., the number of the multi-chamber containers 110 that can be simultaneously molded by the blow molding device 30) can be appropriately set.

[0092] (First temperature adjustment section 32) The first temperature adjustment section 32 includes a mold unit (not shown). Before the first preform 115a is conveyed to the second injection molding section 33, the first temperature adjustment section 32 equalizes the temperature of the first preform 115a and removes temperature deviation, and adjusts the temperature distribution of the first preform 115a to a given state. In addition, the first temperature adjustment section 32 may also have a function of cooling the first preform 115a in the high-temperature state after injection molding.

[0093] The mold unit of the first temperature adjustment section 32 may, for example, include a heating tank that houses the first preform 115a and heats the first preform 115a in a non-contact manner from the surroundings; or may include a temperature adjustment mold that blows compressed air into the first preform 115a for cooling and temperature adjustment. For example, the above-mentioned temperature adjustment mold has a cavity mold (temperature adjustment tank) that can house the first preform 115a, and an air introduction member that abuts against the neck 111 and introduces compressed air into the first preform 115a.

[0094] (Second injection molding section 33) The second injection molding section 33 includes an injection cavity mold 150 and an injection core mold 151, and manufactures a second preform 115b corresponding to the second container 110b. In addition, a second injection device 39 for supplying a second resin material is connected to the second injection molding section 33. The second resin material is a thermoplastic synthetic resin, and the specific type of the material is the same as the description of the first resin material. The second resin material may be a resin material different from the first resin material as described above, or may be, for example, the same resin material with changes in the components such as the content and type of the coloring material compared to the first resin material.

[0095] The injection cavity mold 150 is a mold that defines the outer peripheral shape of the main body portion and the bottom of the second preform 115b. A resin supply nozzle 153 is connected to the lower side of the injection cavity mold 150, and the resin supply nozzle 153 introduces the second resin material from the second injection device 39. The injection core mold 151 is a mold that is inserted into the injection cavity mold 150 and the second holding portion 137b2 of the neck mold 137b, and it defines the inner peripheral shape of the second preform 115b. In addition, the second holding portion 137b2 of the neck mold 137b functions as a mold that defines the outer peripheral shape of the neck 111 of the second preform 115b.

[0096] In addition, in the injection cavity mold 150, at a position corresponding to the first holding portion 137b1, for example, a retraction hole 150a serving as a storage space for accommodating the first preform 115a is formed. Therefore, when the mold is closed, the first preform 115a is inserted into the retraction hole 150a, and interference between the first preform 115a and the injection cavity mold 150 can be avoided. In addition, the injection core mold 151 may also be configured not to be inserted into the first holding portion 137b1 and the first preform 115a, for example.

[0097] Figure 8 (b) of shows the injection molding process in the second injection molding section 33. In the second injection molding section 33, a mold space for forming the second preform 115b is formed by closing the injection cavity mold 150, the injection core mold 151, and the neck mold 137b. Then, the second resin material is injected into the above-mentioned mold space from the second injection device 39 via the resin supply nozzle 153, whereby the second preform 115b is manufactured in the second injection molding section 33. It should be noted that when the mold of the second injection molding section 33 is opened, the neck mold 137b of the conveying mechanism 37 is not opened either, and the first preform 115a and the second preform 115b are held and conveyed.

[0098] (Second temperature adjustment section 34) The second temperature adjustment section 34 includes a mold unit (not shown). Before the first preform 115a and the second preform 115b are conveyed to the blow molding section 35, the second temperature adjustment section 34 equalizes the temperature and removes the temperature deviation of the first preform 115a and the second preform 115b manufactured by the second injection molding section 33, and simultaneously adjusts the temperature distribution of the first preform 115a and the second preform 115b to a given state. As a result, the temperatures of the first preform 115a and the second preform 115b are adjusted to temperatures suitable for final blow molding (for example, about 90°C to 105°C) at the time of being conveyed from the second temperature adjustment section 34.

[0099] In addition, the mold unit of the second temperature adjustment unit 34 is different from the mold unit of the first temperature adjustment unit 32 in that it can accommodate both the first preform 115a and the second preform 115b, but the other parts are the same, so repeated descriptions are omitted for both.

[0100] (Blow molding section 35) The blow molding section 35 blow-molds the first preform 115a and the second preform 115b whose temperatures have been adjusted by the second temperature adjustment unit 34 to manufacture the multi-chamber container 110. The blow molding section 35 includes a blow cavity mold 161, a bottom mold 162, a fitting core (blow core) 163, two sets of air inlet / outlet members 164, and an extension rod 165.

[0101] The blow cavity mold 161 is a pair of split molds that define the shape of the main body portion of the multi-chamber container 110. The first preform 115a and the second preform 115b are accommodated inside the blow cavity mold 161. In addition, the bottom mold 162 is a mold that defines the shape of the bottom of the multi-chamber container 110.

[0102] The fitting core 163 is a mold that is inserted inside the neck mold 137b. In the state of being inserted into the neck mold 137b, it is in close contact with the inner circumference or the upper end surface of the neck 111 of each preform 115a, 115b, and maintains airtightness with the preforms 115a, 115b during blow molding. In the fitting core 163, a set of air inlet / outlet members 164 and an extension rod 165 are respectively arranged at corresponding positions of the first preform 115a and the second preform 115b. Since the structures of the two sets of air inlet / outlet members 164 and the extension rod 165 are the same, repeated descriptions for the structure on the other side are omitted by describing the structure on the side of the first preform 115a.

[0103] The air inlet / outlet member 164 and the extension rod 165 are inserted through an opening formed in the fitting core 163. The air inlet / outlet member 164 is a cylindrical member, and an extension rod 165 that can advance and retreat along the axial direction is arranged concentrically inside it. In addition, the gap between the fitting core 163 and the air inlet / outlet member 164 and the inside of the air inlet / outlet member 164 constitute a supply path and an exhaust path for compressed air (blow air).

[0104] Figure 9 Figures (a) to (c) show the blow molding process in the blow molding section 35. The blow molding section 35 blows compressed air into each preform while stretching the first preform 115a and the second preform 115b to perform blow molding of the container. The blow molding of the first container 110a and the second container 110b is performed simultaneously, and when shaping the container, the first container 110a and the second container 110b are welded together to manufacture the multi-chamber container 10.

[0105] (Take-out section 36) The take-out section 36 is configured to release the neck 111 of the multi-chamber container 110 manufactured by the blow molding section 35 from the neck mold 137b, and take out the multi-chamber container 110 to the outside of the blow molding apparatus 30.

[0106] (Explanation of the method for manufacturing a container) Next, a method for manufacturing the multi-chamber container 110 using the blow molding apparatus 30 according to the second embodiment will be described. The manufacturing process of the second embodiment has the same processes as Figure 6 the first injection molding process (S101), the first temperature adjustment process (S102), the second injection molding process (S103), the second temperature adjustment process (S104), the blow molding process (S105), and the container take-out process (S106).

[0107] (Step S101: First injection molding process) First, as shown in (a) of Figure 8 , in the first injection molding section 31, a first resin material is injected into the mold space formed by the injection cavity mold 140, the injection core mold 141, and the first holding portion 137b1 of the neck mold 137b to manufacture the first preform 115a.

[0108] After that, when the first injection molding section 31 is opened, the transfer plate 37a of the transfer mechanism 37 moves in a manner of rotating a given angle, and the first preform 115a held by the first holding portion 137b1 of the neck mold 137b is transferred to the first temperature adjustment section 32 while maintaining the heat retained during injection molding.

[0109] (Step S102: First temperature adjustment process) Next, the first preform 115a is housed in the mold unit of the first temperature adjustment section 32 to adjust the temperature distribution (equalization of temperature, removal of temperature deviation). After that, the transfer plate 37a moves in a manner of rotating a given angle, and the neck mold 137b is transferred to the second injection molding section 33 while holding the first preform 115a in the first holding portion 137b1.

[0110] (Step S103: Second injection molding process) Next, the neck mold 137b descends relative to the injection cavity 150 of the second injection molding section 33. The first preform 115a is received in the retraction hole 150a of the injection cavity mold 150, and the injection cavity mold 150 and the neck mold 137b are closed. Thereafter, the injection core mold 151 is inserted into the second holding portion 137b2 of the neck mold 137b. Then, a second resin material is injected into the mold space formed by the injection cavity mold 150, the injection core mold 151, and the second holding portion 137b2 of the neck mold 137b to manufacture a second preform 115b.

[0111] Thereafter, when the second injection molding section 33 is opened, the transfer plate 37a moves by rotating a given angle, and the first preform 115a held by the first holding portion 137b1 of the neck mold 137b and the second preform 115b held by the second holding portion 137b2 are both conveyed to the second temperature adjustment section 34 in a state including the heat retained during injection molding.

[0112] (Step S104: Second temperature adjustment process) Next, the first preform 115a and the second preform 115b are respectively received in the second temperature adjustment section 34, and temperature adjustment is simultaneously performed on the first preform 115a and the second preform 115b to approach a temperature suitable for final blow molding. Thereafter, the transfer plate 37a moves by rotating a given angle, and the temperature-adjusted first preform 115a and second preform 115b are conveyed to the blow molding section 35.

[0113] (Step S105: Blow molding process) Next, in the blow molding section 35, blow molding of the multi-chamber container 110 is performed.

[0114] First, the blow molding cavity mold 161 is closed, and the first preform 115a and the second preform 115b are respectively received in the mold space ( Figure 9 as shown in (a)). Then, by lowering the fitting core 163, the air introduction / export member 164 and the extension rod 165 are respectively inserted into the first preform 115a and the second preform 115b.

[0115] Next, as Figure 9 shown in (b), the extension rod 165 is lowered to press the bottom of the preforms 115a and 115b from the inner surface, and longitudinal axis extension is performed as needed. Thereafter, blow molding air is supplied from the air introduction / export member 164 to cause the respective preforms 115a and 115b to perform transverse axis extension.

[0116] By supplying blowing air, the first preform 115a and the second preform 115b bulge out in close contact with the blow mold 161 and the bottom mold 162, respectively, and are shaped into the first container 110a and the second container 110b. Moreover, in the first container 110a and the second container 110b, the surfaces of the main body portions 112 facing each other are welded and integrated over the entire surface to manufacture the multi-chamber container 110 ( Figure 9 of (c)).

[0117] (Step S106: Container removal process) When the blow molding is completed, the blow mold 161 is opened. As a result, the multi-chamber container 110 can be moved from the blow molding section 35.

[0118] Next, the transfer plate 37a moves by rotating a given angle, and the multi-chamber container 110 is conveyed to the removal section 36. In the removal section 36, the two necks 111 of the multi-chamber container 110 are released from the neck mold 137b, and the multi-chamber container 110 is removed to the outside of the blow molding apparatus 30.

[0119] Thus, one cycle in the manufacturing method of the multi-chamber container 110 ends.

[0120] Hereinafter, the effects of the second embodiment will be described.

[0121] The blow molding apparatus 30 of the second embodiment sequentially injection-molds the first preform 115a using the first injection molding section 31 and injection-molds the second preform 115b using the second injection molding section 33 different from the first injection molding section 31. Then, the first preform 115a and the second preform 115b are simultaneously blow-molded using the blow molding section 35 to manufacture the multi-chamber container 10 in which the first container 110a formed from the first preform 115a and the second container 110b formed from the second preform 115b are integrated.

[0122] In the second embodiment, since the first preform 115a and the second preform 115b are separately manufactured using different injection molding sections, it is possible to easily change characteristics such as color, material, and shape between the two preforms 115a and 115b. Therefore, in the blow molding apparatus 30 of the present embodiment, it is possible to easily manufacture the multi-chamber container 110 in which the first container 110a and the second container 110b having different characteristics such as color, material, and shape are integrated.

[0123] In addition, in the second embodiment, a hot parison method is adopted. In this hot parison method, the first container 110a and the second container 110b are blow-molded in a state of retaining heat during injection molding. Therefore, the process from the injection molding of the preform to the blow molding of the multi-chamber container 110 is continuously carried out, and the multi-chamber container 110 can be manufactured with a relatively short manufacturing cycle. In addition, in the second embodiment, the first container 110a and the second container 110b are welded during blow molding to form the multi-chamber container. Therefore, compared with the case where the first container and the second container are separately manufactured and then assembled by fitting in subsequent processes, etc., the manufacturing equipment and manufacturing processes can be simplified. Therefore, the manufacturing cost of the multi-chamber container 110 in which the first container 110a and the second container 110b with different characteristics are integrated can be significantly suppressed.

[0124] The present invention is not limited to the above-described embodiments, and various improvements and design changes can be made without departing from the gist of the present invention.

[0125] For example, in the blow molding apparatus 30 of the above-described embodiment, it may be configured to omit the first temperature adjustment unit 32 between the first injection molding unit 31 and the second injection molding unit 33, and only use the second temperature adjustment unit 34 for temperature adjustment. In the blow molding apparatus 30 having the above structure, the first injection molding unit 31, the second injection molding unit 33, the temperature adjustment unit 34, the blow molding unit 35, and the take-out unit 36 are arranged at positions that rotate 72 degrees each time around the conveying mechanism 37.

[0126] Furthermore, it should be considered that the embodiments disclosed this time are illustrative in all aspects and not restrictive. The scope of the present invention is shown not by the above description but by the scope of the claims, and is intended to include the meanings equivalent to the scope of the claims and all changes within the scope.

[0127] Explanation of Reference Numerals 1... Container body, 10... Preform, 11... Neck, 12... Body part, 13... Bottom, 20... Handle, 20A... Hanger, 20B... Cover part, 21... Mounting base, 30... Blow molding apparatus, 31... First injection molding unit, 32... First temperature adjustment unit, 33... Second injection molding unit, 34... Second temperature adjustment unit, 35... Blow molding unit, 36... Take-out unit, 37... Conveying mechanism, 37a... Transfer plate, 37b... Neck mold, 110... Multi-chamber container, 110a... First container, 110b... Second container, 111... Neck, 112... Body part, 113... Bottom, 115a... First preform, 115b... Second preform, 137b... Neck mold, 137b1... First holding part, 137b2... Second holding part.

Claims

1. A manufacturing apparatus for a resin container, which is a manufacturing apparatus for a resin container having a container body and an additional structure integrated with the container body, the manufacturing apparatus for the resin container comprising: One injection molding section that injection molds a bottomed cylindrical preform using a first resin material; Another injection molding section that injection molds the additional structure using a second resin material; A blow molding section that blow molds the preform integrated with the additional structure while maintaining the heat during injection molding to manufacture the resin container; and A conveyor that moves in the order from the one injection molding section to the another injection molding section, or moves in the order from the another injection molding section to the one injection molding section, and conveys the preform integrated with the additional structure to the blow molding section.

2. The manufacturing apparatus for a resin container according to claim 1, wherein the additional structure is any one of a handle, a sling, a lid connected to the container body, a label, or a band capable of connecting two or more of the resin containers.

3. The manufacturing apparatus for a resin container according to claim 2, wherein the additional structure is mounted on the outer periphery of the preform via an annular mounting base.

4. The manufacturing apparatus for a resin container according to claim 1, wherein the conveyor has a holding portion for holding the neck of the preform, in the one injection molding section, the preform is injection molded in the holding portion, in the another injection molding section, the additional structure is injection molded on the outer peripheral portion of the preform held in the holding portion.

5. The manufacturing apparatus for a resin container according to claim 1, wherein the conveyor has a holding portion capable of holding the additional structure, in the another injection molding section, the additional structure is injection molded in the holding portion, in the one injection molding section, the preform is injection molded on the holding portion in a state where the additional structure is held.

6. A manufacturing apparatus for a multi-chamber resin container, which is a manufacturing apparatus for a multi-chamber resin container integrating a first container and a second container having different characteristics, the manufacturing apparatus for the multi-chamber resin container comprising: A first injection molding section that injection molds a bottomed cylindrical first preform made of resin; A second injection molding section that injection molds a bottomed cylindrical second preform made of resin and having characteristics different from those of the first preform; and A blow molding section that manufactures a multi-chamber container including the first container formed by blow molding the first preform and the second container formed by blow molding the second preform. In the blow molding section, with the first preform and the second preform each having the heat retained during injection molding, the first preform and the second preform are arranged in the same mold, and by simultaneously blow molding the first preform and the second preform, the first container and the second container are integrated within the mold.

7. The manufacturing apparatus for a resin multi-chamber container according to claim 6, wherein, at least one of the characteristics of the color, material, and neck shape of the container of the first container and the second container is different.

8. The manufacturing apparatus for a resin multi-chamber container according to claim 7, wherein, the manufacturing apparatus for the resin multi-chamber container further includes a conveyor. The conveyor has a first holding portion for holding the neck of the first preform and a second holding portion for holding the neck of the second preform. The conveyor sequentially moves the first injection molding section, the second injection molding section, and the blow molding section. In the first injection molding section, the first preform is injection molded at the first holding portion. In the second injection molding section, the second preform is injection molded at the second holding portion. A pair of the first preform and the second preform held by the conveyor are arranged in the mold of the blow molding section.

9. The manufacturing apparatus for a resin multi-chamber container according to claim 8, wherein, the second injection molding section has a receiving space for receiving the first preform held by the first holding portion.

10. The manufacturing apparatus for a resin multi-chamber container according to claim 9, wherein, a temperature adjustment section for simultaneously adjusting the temperatures of the first preform and the second preform is further provided at a subsequent stage of the second injection molding section.

11. A manufacturing method for a resin container, which is a manufacturing method for a resin container having a container body and an additional structure integrated with the container body. The manufacturing method for the resin container includes: an injection molding process of injection molding a bottomed cylindrical preform using a first resin material; another injection molding process of injection molding the additional structure using a second resin material; a blow molding process of blow molding the preform integrated with the additional structure in a state of retaining heat during injection molding to manufacture the resin container; and a process of moving the conveyor in the order from the one injection molding process to the another injection molding process, or moving the conveyor in the order from the another injection molding process to the one injection molding process, and transporting the preform integrated with the additional structure to the blow molding process.

12. A manufacturing method for a resin multi-chamber container, which is a manufacturing method for a resin multi-chamber container integrating a first container and a second container with different characteristics. The manufacturing method for the resin multi-chamber container includes: The first injection molding process, in which a bottomed cylindrical first preform made of resin is injection molded; The second injection molding process, in which a bottomed cylindrical second preform made of resin and having characteristics different from those of the first preform is injection molded; and A blow molding process for manufacturing a multi-chamber container, the multi-chamber container including the first container blow molded from the first preform and the second container blow molded from the second preform, In the blow molding process, with the first preform and the second preform respectively in a state of retaining heat during injection molding, the first preform and the second preform are arranged in the same mold, and by simultaneously blow molding the first preform and the second preform, the first container and the second container are integrated within the mold.

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