Mold, blow molding apparatus, and injection molding apparatus

Abstract

A mold includes a first mold that receives a neck mold that holds a neck portion of a resin-made preform having a bottomed shape and internally houses the preform, and a second mold that is inserted into the neck mold, at least one of a first sliding surface between the neck mold and the first mold and a second sliding surface between the neck mold and the second mold being embedded with a fixed lubricant.

Description

TECHNICAL FIELD

[0001] The present application relates to a mold, a blow molding apparatus, and an injection molding apparatus. BACKGROUND

[0002] In the past, as one of manufacturing apparatuses of a resin container, a blow molding apparatus of a hot parison type has been known. The blow molding apparatus of the hot parison type intermittently transports a preform in the order of an injection molding section, a temperature adjustment section, and a blow molding section by a transfer plate driven in rotation, and performs blow molding of a resin container. In the blow molding apparatus described above, the resin container is blow molded using the retained heat at the time of injection molding of the preform, and thus it is advantageous in that a resin container having a more diverse and beautiful appearance than that of a cold parison type can be manufactured.

[0003] Further, regarding an injection molding mold, for example, a structure in which a solid lubricant is embedded in a sliding surface of a guide hole that guides opening and closing of the mold and a sliding surface of a sliding mold respectively has been proposed (for example, Patent Literature 1), and a structure in which a groove is provided in a contact surface of a moving mold that separates a molded product from a core mold and a lubricating material impregnated body is accommodated in the groove has been proposed (for example, Patent Literature 2).

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. H1-320121

[0007] Patent Literature 2: Japanese Patent Application Laid-Open No. S60-134615 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] The mold used in the blow molding apparatus described above is composed of a plurality of mold members, and most of these mold members are driven by actuators. In order to well mold the preform and the resin container, it is necessary to position each mold member with high accuracy with respect to the preform at the time of mold closing.

[0010] In the blow molding apparatus described above, the positional accuracy of the mold member that holds and transports the preform and the other mold members is ensured, for example, by causing inclined surfaces formed in the respective mold members opposite to each other to slide with respect to each other. In this case, in order to suppress abnormal wear (chipping) of the mold members, it is necessary to apply a lubricant to the sliding surfaces, but the application sites of the lubricant in the blow molding apparatus are numerous, and the application work is complicated. Further, if the application of the lubricant is forgotten, the risk of damage to the mold members significantly increases.

[0011] Thus, the present application has been achieved in view of such problems, and has an object to provide a mold capable of reducing the burden of application of a lubricant and suppressing damage to a mold holding a preform and other molds.

[0012] Technical solution for solving the problems

[0013] One embodiment of the present application is a mold including a first mold that receives a neck mold that holds a neck portion of a resin preform having a bottomed shape and houses the preform inside, and a second mold that is inserted into the neck mold, wherein at least one of a first sliding surface between the neck mold and the first mold and a second sliding surface between the neck mold and the second mold is embedded with a fixed lubricant.

[0014] Effects of the Invention

[0015] According to one embodiment of the present application, the burden of application of a lubricant can be reduced, and damage to a mold holding a preform and other molds can be suppressed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a view schematically showing the structure of a blow molding apparatus of the present embodiment.

[0017] Figure 2 is a view showing a structure example of an injection forming section of the present embodiment.

[0018] Figure 3 is a view showing a structure example of a neck mold.

[0019] Figure 4 is a view showing a structure example of a temperature adjusting section of the present embodiment.

[0020] Figure 5 is a view showing a structure example of a blow molding section of the present embodiment.

[0021] Figure 6 is a flowchart showing the procedures of a blow molding method.

[0022] Figure 7 (A) of FIG. 1 is a view schematically showing the structure of a 2-stage blow molding apparatus, and (B) is a view schematically showing the structure of a 2-stage injection molding apparatus. DETAILED DESCRIPTION

[0023] Hereinafter, an embodiment of the present application will be described with reference to the drawings.

[0024] In the embodiments, for easy understanding of the explanation, structures or elements other than the main part of the present application are simplified or omitted for explanation. In addition, in the drawings, the same reference signs are assigned to the same elements. In addition, the shapes, sizes, and the like of the elements shown in the drawings are schematically shown, and do not represent actual shapes, sizes, and the like.

[0025] Figure 1 is a view schematically showing the structure of a blow molding apparatus of the present embodiment. The blow molding apparatus of the present embodiment is a hot parison method (also referred to as a 1-stage method) apparatus that blow-molds a container using the retained heat (internal heat) at the time of injection molding without cooling a preform to room temperature.

[0026] The blow molding apparatus 20 preferably has four molding stations, and specifically, has an injection molding section 21, a temperature adjustment section 22, a blow molding section 23, a take-out section 24, and a conveyance mechanism 26. The injection molding section 21, the temperature adjustment section 22, the blow molding section 23, and the take-out section 24 are arranged at positions that rotate by a given angle (for example, 90 degrees) each time around the center of the conveyance mechanism 26.

[0027] (Conveyance mechanism 26)

[0028] The conveyance mechanism 26 has a rotation plate 26a (not shown in Figure 1 ) that rotates around an axis in the vertical direction of the paper surface. In the rotation plate 26a, one or more neck portion molds 27 (not shown in Figure 1 ) that hold the neck portions 12 of the preforms 11 or the neck portions 12 of the resin-made containers (hereinafter, simply referred to as containers) 15 are arranged at every given angle. The conveyance mechanism 26 conveys the preforms 11 (or the containers 15) with the neck portions 12 held by the neck portion molds 27 in the order of the injection molding section 21, the temperature adjustment section 22, the blow molding section 23, and the take-out section 24 by rotating the rotation plate 26a. In addition, the conveyance mechanism 26 can also raise and lower the rotation plate 26a, and perform actions involved in the closing and opening (demolding) of the preforms 11 in the injection molding section 21.

[0029] (Injection molding section 21)

[0030] As shown in Figure 2 , the injection molding section 21 has an injection cavity mold 31 and an injection core mold 32, and manufactures the preforms 11. As shown in Figure 1 , an injection device 25 that melts and supplies a resin material that is a raw material of the preforms 11 is connected to the injection molding section 21.

[0031] Here, as shown in Figure 2 , the injection molding section 21 has a mold clamping mechanism 33 that closes and opens the injection cavity mold 31 and the injection core mold 32. The mold clamping mechanism 33 has a movable mold 34 that is movable in the direction of the arrow A in . The movable mold 34 is connected to a mold clamping mechanism drive source 35, and is movable in the direction of the arrow A by the drive of the mold clamping mechanism drive source 35.As shown in (b), the overall shape of the preform 11 is a bottomed cylindrical shape with one end side open and the other end side closed. A neck portion 12 is formed at the end portion of the open side of the preform 11.

[0032] In addition, the material of the container and the preform 11 is a thermoplastic synthetic resin, and can be appropriately selected according to the specifications of the container. As specific kinds 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 (polysulfone), PS (polystyrene), COP / COC (cyclic olefin polymer), PMMA (polymethyl methacrylate: acrylic acid), PLA (polylactic acid), and the like can be listed. Among these resin materials, an additive material such as a colorant can be appropriately added.

[0033] Figure 2 (a) of FIG. 8 is a view showing the state before the closing of the mold of the injection molding portion 21, Figure 2 (b) of FIG. 8 is a view showing the state after the closing of the mold of the injection molding portion 21.

[0034] The injection cavity mold 31 is a mold that defines the shape of the outside of the preform 11 except for the neck portion 12, and receives the neck mold 27 (that is, the injection cavity mold 31 abuts or fits with the neck mold 27). The neck mold 27 functions as a mold that defines the shape of the neck portion 12 of the preform 11 as the inner periphery thereof. The injection core mold 32 is a mold that defines the shape of the inside of the preform 11. The injection core mold 32 is inserted into the neck mold 27 from the upper side in the figure in a state in which the neck mold 27 is disposed on the upper side of the injection cavity mold 31 and the mold is closed. Furthermore, the injection cavity mold 31 is an example of a first mold, and the injection core mold 32 is an example of a second mold.

[0035] In the injection molding portion 21, the injection cavity mold 31, the injection core mold 32, and the neck mold 27 of the transport mechanism 26 are closed to form a mold space in the shape of a preform. Furthermore, as shown in (b) of FIG. 8, a resin material is caused to flow from the injection device 25 into such a mold space in the shape of a preform, and thereby the preform 11 is manufactured by the injection molding portion 21. Figure 2

[0036] In addition, a fixed lubricant (solid lubricant) 28 is embedded in the first sliding surface between the neck mold 27 and the injection cavity mold 31, and the second sliding surface between the neck mold 27 and the injection core mold 32, respectively. By embedding the fixed lubricant in these respective sliding surfaces, the abrasion of the mold components in the injection molding portion 21 can be suppressed. ​

[0037] For example, such as Figure 2 As shown in (a), in the injection core mold 32, a plurality of fixing lubricants 28 are embedded at equal intervals in a ring along the outer periphery of the injection core mold 32 at the conical base end 32a that slides with the inner peripheral surface 27b of the neck mold 27. Similarly, in the injection cavity mold 31, a plurality of fixing lubricants 28 are embedded at equal intervals in a ring along the inner periphery of the injection cavity mold 31 at the conical seat surface 31a that receives the neck mold 27.

[0038] Furthermore, in each sliding surface, multiple fixed lubricants 28 are also arranged at intervals along the axial direction of the component sliding. The number of fixed lubricants arranged in the axial direction is appropriately set according to the axial length of the sliding surface.

[0039] in addition, Figure 3 (a) is a diagram showing the appearance of the neck mold 27. Figure 3 (b) is Figure 3 (a) is a longitudinal sectional view. Figure 3 (c) is Figure 3 (a) Cross section view of line IIIc-IIIc, Figure 3 (d) is Figure 3 (c) Cross section view of line IIId-IIId.

[0040] On the outer peripheral surface 27a of the neck mold 27 facing the seat surface 31a of the injection cavity mold 31, such as Figure 3 As shown in (a), multiple fixed lubricants 28 are embedded. Figure 3 As shown in (c), the fixing lubricant 28 embedded in the outer peripheral surface 27a of the neck mold 27 is arranged at equal intervals in a ring along the outer periphery of the neck mold 27. Similarly, on the inner peripheral surface 27b of the neck mold 27 facing the base end 32a of the injection core mold 32, as shown in (c), the fixing lubricant 28 is arranged in a ring at equal intervals along the outer periphery of the neck mold 27. Figure 3 As shown in (b), multiple fixed lubricants 28 are also embedded. Figure 4 As shown in (d), the fixing lubricant 28 embedded in the inner circumferential surface 27b of the neck mold 27 is arranged at equal intervals in a ring-like manner along the inner circumference of the neck mold 27.

[0041] Here, the aforementioned fixing lubricant 28 is manufactured, for example, by filling a molding die with powders of main materials such as carbon raw material powder, graphite powder, molybdenum sulfide, polytetrafluoroethylene, and paraffin wax, and a binder, molding it into a predetermined shape, removing it from the die, and then firing it. Alternatively, the fixing of the fixing lubricant 28 to the die component can be achieved by pressing it into the die component or by fixing it based on an adhesive.

[0042] Furthermore, in the following description, the structure of the fixed lubricant 28 will be marked with the same symbols as the injection molding part 21, and repeated descriptions will be omitted.

[0043] Furthermore, when the injection molding section 21 is opened, the neck mold 27 of the conveying mechanism 26 is not opened, and the neck 12 of the preform 11 is directly held and conveyed. The number of preforms 11 simultaneously molded in the injection molding section 21 (i.e., the number of containers 15 that can be simultaneously molded in the blow molding apparatus 20) can be appropriately set.

[0044] (Temperature adjustment unit 22)

[0045] The temperature adjustment unit 22 homogenizes or removes overheating of the preform 11 manufactured by the injection molding unit 21, adjusting the temperature of the preform 11 to a temperature suitable for final blow molding (e.g., approximately 90°C to 105°C). In addition, the temperature adjustment unit 22 also functions to cool the preform 11 at its high temperature after injection molding.

[0046] like Figure 4 As shown, the temperature adjustment unit 22 includes a cavity mold 41 and a core mold 42. Furthermore, the cavity mold 41 is an example of a first mold, and the core mold 42 is an example of a second mold.

[0047] The cavity mold 41 is a mold having a temperature-regulating space 41a with a shape substantially the same as that of the preform 11 manufactured by the injection molding section 21, and is capable of accommodating the preform 11 inside. In addition, an exhaust hole 41c is formed on the bottom surface of the temperature-regulating space 41a of the cavity mold 41 to expel air when the preform 11 is inserted.

[0048] The core mold 42 is a mold inserted into the interior of the preform 11, and is retractably configured relative to the neck mold 27 that holds the preform 11 in the temperature adjustment section 22. Figure 4 In (a), the core mold 42 is in a retracted state, which is omitted from the illustration. On the other hand, in Figure 4 In (b), it indicates the state in which the core mold 42 moves to the lower side of the figure and is inserted into the neck mold 27.

[0049] Inside the cavity mold 41 and the core mold 42, flow paths (not shown) are formed for the flow of temperature regulating medium (cooling medium). Therefore, the temperature of the cavity mold 41 and the core mold 42 is maintained at a given temperature by the temperature regulating medium flowing inside. The preform 11 in the temperature regulating section 22 is adjusted to a given temperature through heat exchange with the cavity mold 41 facing outward and the core mold 42 facing inward.

[0050] In addition, a first sliding surface between the neck mold 27 and the cavity mold 41 and a second sliding surface between the neck mold 27 and the core mold 42 are embedded with the fixed lubricant 28, respectively. By embedding the fixed lubricant 28 in these respective sliding surfaces, the wear of the mold components in the temperature adjustment section 22 can be suppressed.

[0051] For example, as shown in (b) of FIG. 6, in the core mold 42, a plurality of fixed lubricants 28 are embedded in a ring-like manner at equal intervals along the outer periphery of the core mold 42 at the tapered base end portion 42a that slides against the inner peripheral surface 27b of the neck mold 27. Similarly, as shown in (a) of FIG. 6, in the cavity mold 41, a plurality of fixed lubricants 28 are embedded in a ring-like manner at equal intervals along the inner periphery of the cavity mold 41 at the tapered seating surface 41b that receives the neck mold 27. In addition, as described above, the fixed lubricant 28 is embedded at the outer peripheral surface 27a and the inner peripheral surface 27b of the neck mold 27 that transports the preform 11. Figure 4 Figure 1 For example, as shown in (b) of FIG. 6, in the core mold 42, a plurality of fixed lubricants 28 are embedded in a ring-like manner at equal intervals along the outer periphery of the core mold 42 at the tapered base end portion 42a that slides against the inner peripheral surface 27b of the neck mold 27. Similarly, as shown in (a) of FIG. 6, in the cavity mold 41, a plurality of fixed lubricants 28 are embedded in a ring-like manner at equal intervals along the inner periphery of the cavity mold 41 at the tapered seating surface 41b that receives the neck mold 27. In addition, as described above, the fixed lubricant 28 is embedded at the outer peripheral surface 27a and the inner peripheral surface 27b of the neck mold 27 that transports the preform 11.

[0052] (Blow molding section 23)

[0053] Returning to FIG. 1, Figure 5 , the blow molding section 23 blow-molds the preform 11 that has been temperature-adjusted by the temperature adjustment section 22 to manufacture the container.

[0054] The blow molding section 23 is provided with a pair of split molds corresponding to the shape of the container 15, namely, a blow cavity mold 51 and a base mold 52, and an air introduction member (not shown) that functions as an extension rod. Here, Figure 5 (a) of FIG. 7 shows a state before the blow cavity mold 51 and the base mold 52 are closed, Figure 5 (b) of FIG. 7 shows a state after the blow cavity mold 51 and the base mold 52 are closed.

[0055] The blow cavity mold 51 is a mold material that defines the shape of the container 15 except for the bottom surface. The blow cavity mold 51 is divided by a split surface along the up-and-down direction of Figure 5 , and is configured to be openable and closable in the left-and-right direction of Figure 5 . In addition, the blow cavity mold 51 is an example of a first mold.

[0056] The base mold 52 is disposed on the lower side of the blow cavity mold 51, and is a mold that defines the shape of the bottom surface of the container 15. By closing the base mold 52 and the blow cavity mold 51, a mold space that defines the shape of the container 15 is formed. The base mold 52 is driven, for example, in such a manner that it waits at a position below the bottom of the preform 11 without contacting the preform 11 before the blow cavity mold 51 is closed, and rapidly rises to a molding position Figure 5 (b) after the blow cavity mold 51 is closed.

[0057] ​Furthermore, the air inlet component is a hollow cylindrical body that supplies blow molding air to the preform and abuts against the neck of the preform. Additionally, the air inlet component can move forward and backward in the vertical direction shown in the figure, performing the function of extending the longitudinal axis of the preform 11 by descent. Moreover, the air inlet component is an example of a second mold.

[0058] Furthermore, a fixed lubricant 28 is embedded in the third sliding surface between the blow molding cavity mold 51 and the bottom mold 52. By embedding the fixed lubricant 28 in this sliding surface, wear on the mold components in the blow molding cavity mold 51 and the bottom mold 52 can be suppressed. In addition, although in Figure 6 The illustration is omitted, but a fixing lubricant 28 is also embedded in the first sliding surface of the outer peripheral surface 27a of the blow molding cavity mold 51 and the neck mold 27, the inner peripheral surface 27b of the neck mold 27 and the second sliding surface of the air inlet component.

[0059] For example, such as Figure 7 As shown in (a), in the bottom mold 52, a plurality of fixing lubricants 28 are embedded at equal intervals in a ring along the outer periphery of the cylindrical or conical base end (abutment portion) 52a that slides with the blow molding cavity mold 51. On the other hand, in the blow molding cavity mold 51, a plurality of fixing lubricants 28 are embedded at equal intervals in a ring along the inner periphery of the cylindrical or conical opening 51a that receives the base end end 52a of the bottom mold 52.

[0060] Furthermore, the bottom mold 52 also includes: a shaping portion 52c, which defines the bottom shape of the container 15; a cylindrical or conical intermediate portion 52b, which connects the shaping portion 52c and the base end portion 52a; and a stepped portion 52d, which connects the intermediate portion 52b and the base end portion 52a, and defines the maximum rising position of the bottom mold 52. The diameter of the base end portion 52a is larger than the diameter of the intermediate portion 52b. On the other hand, the blow molding cavity mold 51, when closed, also has a cylindrical or conical second opening portion 51b on the (opposite) part facing the intermediate portion 52b. The diameter of the opening portion 51a is larger than the diameter of the second opening portion 51b. No fixing lubricant 28 is embedded on the outer peripheral surface of the intermediate portion 52b and the inner peripheral surface of the second opening portion 51b, which is configured to provide a given gap when the mold is closed, and the gap functions as an venting portion.

[0061] (Removal section 24)

[0062] The removal section 24 is configured to open the neck 12 of the container manufactured by the blow molding section 23 from the neck mold 27 and remove the container to the outside of the blow molding apparatus 20.

[0063] (Explanation of blow molding method)

[0064] Next, a blow molding method based on the blow molding apparatus 20 of the present embodiment will be described.

[0065] Figure 7 is a flowchart showing the procedure of the blow molding method.

[0066] (Step S101: First injection molding procedure)

[0067] First, in the injection molding section 21, a resin material is injected from the injection device 25 into a mold space formed by the injection cavity mold 31, the injection core mold 32, and the neck mold 27 of the transport mechanism 26, and a preform 11 is manufactured.

[0068] After that, when the mold of the injection molding section 21 is opened, the rotating plate 26a of the transport mechanism 26 is rotated by a given angle, and the preform 11 held by the neck mold 27 is transported to the temperature adjustment section 22 in a state in which heat is retained from the injection molding.

[0069] (Step S102: Temperature adjustment procedure)

[0070] Next, in the temperature adjustment section 22, temperature adjustment for bringing the temperature of the preform 11 close to a temperature suitable for final blow molding is performed.

[0071] In the temperature adjustment procedure, first, the preform 11 is housed in the temperature adjustment space 41a of the cavity mold 41. Next, the core mold 42 is inserted into the preform 11 housed in the cavity mold 41.

[0072] Further, since the cavity mold 41 and the core mold 42 correspond to the shape of the preform 11, the shape of the preform 11 also maintains a desired shape in the temperature adjustment procedure.

[0073] In the temperature adjustment procedure, the preform 11 is subjected to temperature adjustment so as not to become lower than a temperature suitable for blow molding by facing the preform 11 with the cavity mold 41 and the core mold 42, and further, a temperature deviation generated at the time of injection molding is reduced.

[0074] After that, the rotating plate 26a of the transport mechanism 26 is rotated by a given angle, and the preform 11 after temperature adjustment held by the neck mold 27 is transported to the blow molding section 23.

[0075] (Step S103: Blow molding procedure)

[0076] Next, in the blow molding section 23, blow molding of the container 15 is performed.

[0077] First, the blow cavity mold 51 is closed to house the preform 11 in the mold space. In the case where the preform 11 is longer than the container 15, the bottom mold 52 is made to wait at a position below the bottom of the preform 11 without contacting the bottom of the preform 11 before the blow cavity mold 51 is closed. Then, after the blow cavity mold 51 is closed, the bottom mold 52 is made to rapidly rise to the molding position.

[0078] By lowering the air introduction member (blow pin) before and after the blow cavity mold 51 and the bottom mold 52 are closed, the air introduction member is brought into abutment with the neck 12 of the preform 11. Then, the extension rod is lowered to restrain the bottom of the preform 11 from the inner surface, the longitudinal axis is extended as necessary, and blow air is supplied from the air introduction member, whereby the preform 11 in the mold space is subjected to the lateral axis extension. Thus, the preform 11 is blown out and shaped in such a manner as to tightly adhere to the mold space of the blow cavity mold 51 and the bottom mold 52, and is blow-molded into the container 15.

[0079] (Step S104: container taking-out process)

[0080] When the blow molding is completed, the mold of the blow molding section 23 is opened. Thus, the container 15 can be moved from the blow molding section 23.

[0081] Next, the rotating plate 26a of the conveyance mechanism 26 is rotated by a given angle, and the container 15 is conveyed to the taking-out section 24. In the taking-out section 24, the neck 12 of the container 15 is opened from the neck mold 27, and the container 15 is taken out to the outside of the blow molding apparatus 20.

[0082] The above completes the series of processes of the blow molding method. Thereafter, by rotating the rotating plate 26a of the conveyance mechanism 26 by a given angle, the above-described processes of S101 to S104 are repeated.

[0083] The present application is not limited to the above-described embodiment, and various modifications and design changes can be made within the scope of the gist of the present application.

[0084] In the above-described embodiment, an example in which the fixed lubricant 28 is embedded in both of the two mold members that slide has been described. However, the fixed lubricant 28 can be embedded in only either of the two mold members that slide. Further, for example, in an injection molding mold, it can be configured to embed the fixed lubricant in one of the first sliding surface of the neck mold 27 and the injection cavity mold 31, or the second sliding surface of the neck mold 27 and the injection core mold 32, and not to embed the fixed lubricant in the other.

[0085] Further, for example, in the blow molding apparatus 20 using the mold of the present application, in the case where a multilayer preform 11 is molded by injection molding twice or more, a plurality of injection molding sections (a blow molding apparatus of a hot parison system having 5 or 6 molding stations) can be provided at the front stage of the temperature adjustment section 22. Also, a device structure in which the temperature adjustment section 22 is not present (a blow molding apparatus of a hot parison system having 3 molding stations of the injection molding section 21, the blow molding section 23, and the take-out section 24) can be used.

[0086] Further, the mold of the present embodiment can also be applied to a blow molding apparatus that does not have an injection molding section. ​ FIG. 1 is a diagram schematically showing the structure of a 2-stage (cold parison) blow molding apparatus 20a.

[0087] The blow molding apparatus 20a has a preform supply section 60, a blow molding section 23, a heating section 62 (broad temperature adjustment section 22a), a conveying mechanism 26, and a container take-out section 61. The heating section 62 has a ring-shaped heating conveying path, and a heating device (not shown) such as an infrared heater that can heat the main body section of the preform to a suitable blow molding temperature. The conveying mechanism 26 is disposed in the heating section 62, and has a first holding member 26al that holds and conveys the preform received from the preform supply section 60, a second holding member 26bl that conveys the preform received from the heating section 62 to the blow molding section 23, and a third holding member 26cl that conveys the container from the blow molding section 23 to the container take-out section 61. Further, the structure of the mold used in the blow molding section 23 of the blow molding apparatus 20a is the same as that of the above-described embodiment.

[0088] The preform supply section 60 receives a preform (for example, made of PET) that is prepared in advance by another injection molding apparatus, and loads it to the first holding member 26al. Further, the container take-out section 61 is disposed adjacent to the blow molding section 23, and has a container holding section (not shown) that receives the container manufactured by the blow molding section 23 and conveyed by the third holding member 26cl. The heating section 62 conveys and heats the preform held by the first holding member 26al while rotating it.

[0089] In the blow molding apparatus 20a, the preform supplied by the preform supply section 60 is heated to a suitable blow molding temperature (for example, 100 to 110°C) by the heating section 62, and then the preform is conveyed to the blow molding section 23. In the blow molding section 23, the preform is accommodated in the mold composed of the blow cavity mold 51 and the bottom mold 52, and is molded by blow molding to manufacture a container. After the blow molding, the container is conveyed to the container take-out section 61.

[0090] Further, the mold of the present embodiment can also be applied to an injection molding apparatus that does not have a blow molding section. ​ FIG. 2 is a diagram schematically showing the structure of a 2-stage type injection molding apparatus 70.

[0091] The injection molding apparatus 70 has an injection molding section 21, a take-out section 71, a cooling section 72 (general temperature adjustment section 22a), and a conveyance mechanism 26. The cooling section 72 is provided with a cooling pot (not shown) that houses a preform and cools the main body section of the preform from the outside, and a cooling rod (not shown) that is inserted into the hollow section of the main body section of the preform and cools the main body section from the inside. The conveyance mechanism 26 has a first holding member 26al that conveys the preform from the injection molding section 21 to the cooling section 72, and a second holding member 26bl that conveys the preform from the cooling section 72 to the take-out section 71. An injection device 25 is connected to the injection molding section 21 of the injection molding apparatus 70. Further, the structure of the mold used in the injection molding section 21 of the injection molding apparatus 70 is the same as that of the above-described embodiment.

[0092] In the injection molding apparatus 70, in the injection molding section 21, a resin material (e.g., PET) is introduced from the injection device 25 to the molding space of the mold composed of the neck mold 27, the injection cavity mold 31, and the injection core mold 32 in the closed mold state, and injection molding of the preform is performed. Thereafter, the preform that is demolded in a high temperature state (e.g., a state in which the outer surface of the main body section is 100 to 130°C) is conveyed to the cooling section 72. In the cooling section 72, the preform is cooled to a degree that does not cause shrinkage deformation such as sink marks even when left to stand at normal temperature (e.g., a state in which the outer surface of the main body section is 50 to 60°C or less). Subsequently, the preform that is sufficiently cooled is conveyed to the take-out section 71.

[0093] Further, the present embodiment disclosed this time is illustrative in all respects and should not be considered limiting. The scope of the present application is not shown by the above-described description but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0094] Symbol Explanation

[0095] 11... preform, 12... neck, 20, 20a... blow molding apparatus, 21... injection molding section, 22... temperature adjustment section, 23... blow molding section, 26... conveyance mechanism, 27... neck mold, 28... fixed lubricant, 31... injection cavity mold, 32... injection core mold, 41... cavity mold, 42... core mold, 51... blow cavity mold, 52... bottom mold, 70... injection molding apparatus.

Claims

1. A mold comprising: an injection molding mold for injection molding of a preform made of resin having a bottom shape; a temperature adjustment mold, which is a mold different from the injection molding mold, for cooling the preform ejected after the injection molding; and a neck mold, which is commonly used between the injection molding mold and the temperature adjustment mold, for holding a neck portion of the preform to transfer the preform from the injection molding mold to the temperature adjustment mold, wherein the injection molding mold receives an outer periphery of the neck mold, and includes an injection cavity mold that houses the preform inside, and an injection core mold that is inserted into an inner periphery of the neck mold, wherein the temperature adjustment mold receives the outer periphery of the neck mold, and includes a temperature adjustment cavity mold that houses the preform inside, and a temperature adjustment core mold that is inserted into the inner periphery of the neck mold, and wherein a fixed lubricant is embedded in an outer peripheral surface and an inner peripheral surface of the neck mold, respectively.

2. The mold according to claim 1, wherein the mold further comprises a blow molding mold for blow molding of the preform, and wherein the blow molding mold receives the outer periphery of the neck mold, and includes a blow cavity mold that houses the preform inside, and a blow core mold that is inserted into the inner periphery of the neck mold.

3. The mold according to claim 2, wherein the blow molding mold further comprises a bottom mold that is inserted into the blow cavity mold, and defines a bottom surface shape of a container after blow molding, and wherein a fixed lubricant is embedded in a sliding surface between the blow cavity mold and the bottom mold.

4. A blow molding device comprising the mold according to any one of claims 1 to 3.

5. An injection molding device comprising the mold according to claim 1, and injecting a resin material into the mold to mold a preform. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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