Method for manufacturing a resin container and manufacturing apparatus for a resin container

Abstract

To provide a method for producing a resin container and an apparatus for producing a resin container, where the method and apparatus can reduce a difference in temperature state between pre-forms and can stably manufacture a high-quality container.SOLUTION: There is provided a method for producing a resin container. The method for producing a resin container comprises: an injection molding step (S1) for injection molding a plurality of pre-forms along a predetermined array direction; a temperature adjustment step (S2) for adjusting the temperature of the pre-forms; and a blow molding step (S3) for blow-molding resin container from the pre-forms, in which the temperature adjustment step (S2) comprises: a first temperature adjustment step (S2-1) for adjusting a temperature of the preform, a second temperature adjustment step (S2-2) for adjusting a temperature of the preform under a condition different from that in the first temperature adjustment step (S2-1); and a fine adjustment step (S2-3a) for finely adjusting a temperature of the preform.SELECTED DRAWING: Figure 5

Description

Technical Field

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

Background Art

[0002] Patent Document 1 describes a hot parison blow molding apparatus and a method for manufacturing a resin container using the same. Patent Document 2 describes a large container obtained by blow molding a bottomed cylindrical preform obtained by injection molding a polyester resin after adjusting the temperature.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a hot parison blow molding apparatus, when a method of injection molding a plurality of preforms along a predetermined arrangement direction and blowing and molding a container by transporting the preforms in a direction intersecting the arrangement direction is adopted, the take-up ratio can be changed between the injection molding part and the blow molding part, and there are advantages such as downsizing of the blow molding die and local cooling of the preform during transportation. On the other hand, in this method, when the injection-molded preforms are divided into units of the number of blow moldings (the number of blow cavities) and intermittently transported to the blow molding part, the length of the waiting time until reaching the blow molding part changes for each unit, and this causes a temperature difference between the preforms to easily occur.

[0005] The present invention aims to provide a method for manufacturing a resin container and a manufacturing apparatus for a resin container, which can reduce the difference in temperature states between preforms while adopting a conveyance method in which a temperature difference is likely to occur between preforms, and can stably manufacture a container with good quality.

[0006] Another object of the present invention is to provide a method for manufacturing a resin container and a manufacturing apparatus for a resin container, which can ensure uniform temperature of the preforms while adopting a conveyance method in which a temperature difference is likely to occur between preforms, and can stably manufacture a container with good quality.

Means for Solving the Problems

[0007] A method for manufacturing a resin container according to one aspect of the present invention that can solve the above problems is a method for manufacturing a resin container having an injection molding step of injection molding a plurality of preforms along a predetermined arrangement direction, a temperature control step of adjusting the temperature of the preforms, and a blow molding step of molding a resin container from the preforms, after the injection molding step, conveying the preforms and the container along a conveyance direction intersecting the arrangement direction over the temperature control step and the blow molding step, wherein the temperature control step includes a first temperature control step of adjusting the temperature of the preforms, a second temperature control step of adjusting the temperature of the preforms under conditions different from those of the first temperature control step, and a fine adjustment step of finely adjusting the temperature of the preforms. It is a method for manufacturing a resin container.

[0008] A manufacturing apparatus for a resin container according to one aspect of the present invention that can solve the above problems is a manufacturing apparatus for a resin container having an injection molding section for injection molding a plurality of preforms along a predetermined arrangement direction, a temperature control section for adjusting the temperature of the preforms, and a blow molding section for molding a resin container from the preforms, having a conveyance mechanism for conveying the preforms and the container along a conveyance direction intersecting the arrangement direction over the temperature control section and the blow molding section, The temperature control unit includes a first temperature control unit that adjusts the temperature of the preform, a second temperature control unit that adjusts the temperature of the preform under conditions different from those of the first temperature control unit, and a fine adjustment unit that finely adjusts the temperature of the preform. It is a manufacturing apparatus for resin containers.

[0009] A method for manufacturing a resin container according to one aspect of the present invention that can solve the above problems is a method for manufacturing a resin container having an injection molding step of injection molding a plurality of preforms along a predetermined arrangement direction, a temperature control step of adjusting the temperature of the preform, and a blow molding step of molding a resin container from the preform, after the injection molding step, the preform and the container are conveyed along a conveyance direction intersecting the arrangement direction over the temperature control step and the blow molding step, the temperature control step includes a heat preservation temperature control step of suppressing a temperature drop of the temperature-controlled preform. It is a method for manufacturing a resin container.

[0010] A manufacturing apparatus for a resin container according to one aspect of the present invention that can solve the above problems is a manufacturing apparatus for resin containers having an injection molding unit that injection molds a plurality of preforms along a predetermined arrangement direction, a temperature control unit that adjusts the temperature of the preform, and a blow molding unit that molds a resin container from the preform, having a conveyance mechanism that conveys the preform and the container along a conveyance direction intersecting the arrangement direction over the temperature control unit and the blow molding unit, the temperature control unit includes a heat preservation temperature control unit that suppresses a temperature drop of the temperature-controlled preform. It is a manufacturing apparatus for resin containers.

Effects of the Invention

[0011] According to the present invention, it is possible to provide a method for manufacturing a resin container and a manufacturing apparatus for a resin container, which can reduce the difference in temperature states between preforms while adopting a conveying method in which a temperature difference is likely to occur between preforms, and can stably manufacture a container with good quality.

[0012] Also according to the present invention, it is possible to provide a method for manufacturing a resin container and a manufacturing apparatus for a resin container, which can ensure uniform temperature of the preforms while adopting a conveying method in which a temperature difference is likely to occur between preforms, and can stably manufacture a container with good quality.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the dimensions of each member shown in these drawings may be different from the actual dimensions of each member for the sake of convenience in explanation.

[0015] FIG. 1 is a schematic plan view showing a manufacturing apparatus 1 for a resin container according to the present embodiment. FIG. 2 is a schematic side view showing the manufacturing apparatus 1 for a resin container according to the present embodiment. The manufacturing apparatus 1 is a so-called 4-station type molding apparatus including an injection molding unit 100 that injection-molds a plurality of preforms 10 along a predetermined arrangement direction C, a temperature control unit 200 that adjusts the temperature of the preforms 10, a blow molding unit 300 that molds a resin container 20 from the preforms 10, and a take-out unit 400 that takes out the molded container 20. The container 20 manufactured by the manufacturing apparatus 1 can be a large bottle such as a 5-gallon bottle, for example. It has a structure that adopts a split blow method in a one-step manner.

[0016] In this example, in the manufacturing apparatus 1, the injection molding unit 100, the temperature control unit 200, the blow molding unit 300, and the take-out unit 400 are linearly arranged. The manufacturing apparatus 1 has conveying mechanisms 600 and 650 that convey the preforms 10 and the container 20 along a conveying direction A that intersects the arrangement direction C over the temperature control unit 200 and the blow molding unit 300 (omitted in FIG. 1). The manufacturing apparatus 1 includes a conversion unit 150 having a conversion mechanism 500 that redirects a plurality of preforms 10 arranged in the arrangement direction C so as to be arranged in the direction along the conveying direction A between the injection molding unit 100 and the temperature control unit 200.

[0017] The injection molding unit 100 injection-molds a plurality of preforms 10 so that the plurality of preforms 10 are arranged along the arrangement direction C. The injection molding unit 100 includes at least one first injection mold 110 and at least two second injection molds 120. The first injection mold 110 has an injection cavity mold 112 including a plurality (for example, four) of recesses 114 that define the outer shapes of the body portion and the bottom portion of the preform 10. The first injection mold 110 is connected to an injection device 102 that injects a resin material (such as polyester like polyethylene terephthalate (PET), polycarbonate (PC), etc.) that serves as the raw material of the preform 10. In the arrangement direction C that is orthogonal to the injection direction B of the injection device 102, a plurality (for example, four) of recesses 114 are linearly aligned. The arrangement direction C also intersects (is orthogonal to) the conveyance direction A. Further, the injection device 102 is connected to the central portion in the arrangement direction C of the first injection mold 110. A refrigerant is flowed through the first injection mold 110 and the second injection mold 120 of the injection molding unit 100. The temperature of the refrigerant is set to, for example, 5 to 20°C.

[0018] The two second injection molds 120 each have four injection core molds 122 and an injection neck mold (neck mold) 124 arranged along the arrangement direction C. The injection core mold 122 defines the inner shapes of the neck portion, the body portion, and the bottom portion of the preform 10, and the injection neck mold 124 defines the outer shape of the neck portion. The two second injection molds 120 are connected to a first rotating member 130 that is a turntable and are positioned on a circumference centered on the first central axis X1, and are configured to be intermittently rotatable with respect to the first central axis X1. Specifically, the two second injection molds 120 are arranged at positions rotated 180° from each other with respect to the first central axis X1. The first rotating member 130 is configured to rotate intermittently by 180° per injection molding cycle to exchange the positions of the two second injection molds 120 with each other.

[0019] One side of the second injection mold 120 is disposed at the position (injection position P1) where the first injection mold 110 is arranged, and the other side of the second injection mold 120 is arranged at a position (post-cooling position P2) rotated 180° on the opposite side with respect to the first central axis X1 of the injection position P1. The post-cooling position P2 is a position where the preform 10 injection-molded at the injection position P1 is held by the injection core mold 122 and the injection neck mold 124 and cooled. At the post-cooling position P2, a cooling pod 140 capable of accommodating and lifting the preform 10 is provided. The cooling pod 140 includes a cavity 142 for accommodating the preform 10, and a flow path for a refrigerant such as water is provided around the cavity 142, and it is a member capable of cooling the preform 10 from the outside. The cooling pod 140 is set to a temperature of, for example, 5 to 60°C, preferably 5 to 20°C.

[0020] In other words, the injection molding unit 100 includes an injection part which is the part of the injection position P1, and a post-cooling part which is the part of the post-cooling position P2. The injection part injects molten resin into the cavity to form the preform 10. The post-cooling part cools the preform 10 formed by the injection part and released from the cavity.

[0021] Subsequently, the conversion mechanism 500 of the conversion unit 150 will be described with reference to FIG. 3. FIG. 3 is a perspective view showing an overview of the conversion mechanism 500. The conversion mechanism 500 includes holding members 510a, 510b (for example, hand members or chuck members) configured to be able to hold the preform 10, a second rotating member 520 which is a moving mechanism configured to be able to move the holding members 510a, 510b, and two holding member conversion mechanisms 530 (for example, electric motors) configured to be able to change the directions of the holding members 510a, 510b while moving the holding members 510a, 510b. Note that a second cooling pod 140b composed of a pair of split molds capable of accommodating the preform 10 may be provided at the delivery position P4, which will be described later, of the conversion mechanism 500. The second cooling pod 140b is set to a temperature of, for example, 5 to 60°C, and it is desirable to be set to a higher temperature than the first cooling pod 140.

[0022] The holding members 510a and 510b are provided with a holding portion 512 (e.g., claws, hands) that grasps and holds the neck portion 12 of the preform 10. The holding members 510a and 510b are configured to be able to move the preform up and down, that is, to be able to move up and down. Further, the holding portion 512 is configured to be slidable in the horizontal direction with respect to the holding member 510a (510b). The holding member 510a (510b) is configured to be able to move up and down with respect to the second rotating member 520.

[0023] The second rotating member 520 is configured to rotate about a second central axis X2 by a rotation mechanism 540 (e.g., an electric motor). In other words, the second rotating member 520 is configured to be able to move the holding members 510a and 510b from a receiving position P3 that receives a plurality of preforms 10 injection-molded in the injection molding section 100 to a sending position P4 that sends out the preforms 10 to the temperature control section 200. The holding members 510a and 510b are supported by the second rotating member 520 at positions rotated 180° from each other with respect to the second central axis X2 on the second rotating member 520. Two holding member conversion mechanisms 530 are provided on the second rotating member 520 so as to correspond to the holding members 510a and 510b respectively. Note that the post-cooling position P2 and the receiving position P3 are arranged so as to overlap in the vertical direction (up and down direction) of the manufacturing apparatus 1. Further, when a second cooling pod is provided, the second post-cooling position and the sending position P4 described later may be arranged so as to overlap in the vertical direction (up and down direction) of the manufacturing apparatus 1.

[0024] The holding member conversion mechanism 530 is configured to be able to change the direction so that while moving the holding members 510a and 510b, the holding members 510a and 510b rotate themselves and a plurality of preforms 10 arranged in the arrangement direction C are arranged in the direction along the conveyance direction A. That is, the holding members 510a and 510b are configured to be able to rotate (self-rotate) intermittently by 90° about a third central axis X3 by the holding member conversion mechanism 530.

[0025] Here, referring to FIG. 4, the operation of the conversion mechanism 500 will be described in detail. FIG. 4 is a diagram showing the operation of the conversion mechanism 500. Although the conversion mechanisms 500 in FIGS. 3 and 4 do not necessarily match, they are common in terms of the configuration described above, and for the sake of convenience, the operation will be described with reference to FIG. 4. (a) of FIG. 4 shows the initial state of the conversion mechanism 500, (b) of FIG. 4 shows the primary state of the conversion mechanism 500, (c) of FIG. 4 shows the secondary state of the conversion mechanism 500, and (d) of FIG. 4 shows the tertiary state of the conversion mechanism 500.

[0026] In the initial state shown in FIG. 4(a), the holding member 510a is disposed at the receiving position P3, and a plurality of holding portions 512 are arranged along the arrangement direction C in the injection molding portion 100. Also, in the initial state, the holding member 510b is disposed at the delivery position P4, and a plurality of holding portions 512 are arranged along the conveyance direction A.

[0027] Next, the conversion mechanism 500 transitions to the primary state shown in FIG. 4(b) and then to the secondary state shown in FIG. 4(c). When transitioning from the initial state to the primary state and further to the secondary state, the second rotating member 520 rotates clockwise, and the holding member 510a and the holding member 510b are position-exchanged. Also, when transitioning from the initial state to the primary state and further to the secondary state, the holding member 510a rotates counterclockwise about its own axis, and the holding member 510b rotates clockwise about its own axis. When the transition reaches the tertiary state shown in FIG. 4(d), the second rotating member 520 rotates 180° and stops. Also, when the transition reaches the tertiary state, the holding member 510a and the holding member 510b each rotate 90° in the reverse direction and stop. In the tertiary state, the holding member 510a is disposed at the delivery position P4, and a plurality of holding portions 512 are arranged along the conveyance direction A. Also, in the tertiary state, the holding member 510b is disposed at the receiving position P3, and a plurality of holding portions 512 are arranged along the arrangement direction C in the injection molding portion 100. When the second cooling pod is provided, the second cooling pod 140b accommodates and holds the preform 10 at the delivery position P4.

[0028] Subsequently, from the tertiary state to the secondary state and then to the primary state, the holding members 510a and 510b are swapped in position by the reverse operation of the above-described operation. That is, the second rotating member 520 rotates counterclockwise, the holding member 510a rotates clockwise about its own axis, and the holding member 510b rotates counterclockwise about its own axis. Thereby, the conversion mechanism 500 returns to the initial state. By repeating the above operation, the holding members 510a and 510b are swapped in position, and the preform 10 is transferred from the injection molding section 100 to the temperature control section 200. Note that the second rotating member 520 rotates in a manner of switching between clockwise and counterclockwise every 180° rotation, but it may also be configured to rotate in a fixed clockwise or counterclockwise direction and perform intermittent rotation of 180°.

[0029] Here, one preform located at one end of a plurality of preforms 10 along the arrangement direction C in the injection molding section 100 is defined as the first preform, and one preform located at the other end is defined as the N1-th (where N1 represents an integer of 2 or more) preform. In the above-described conversion mechanism 500, when the holding members 510a and 510b are moved from the receiving position P3 to the sending position P4, they both rotate counterclockwise about their own axes to change the arrangement direction of the holding portions 512 from the arrangement direction C to the conveying direction A. Although the directions of rotational movement of the holding members 510a and 510b when moving from the receiving position P3 to the sending position P4 are different, the directions of rotation about their own axes are common. That is, the conversion mechanism 500 is configured to be able to change the direction so that a plurality of preforms 10 arranged in the arrangement direction C are arranged along the conveying direction A such that the first preform (or the N1-th preform) is always at the head.

[0030] Here, returning to FIGS. 1 and 2, the manufacturing apparatus 1 will be described. When the preform 10 is held by the conversion mechanism 500 between the injection molding section 100 and the temperature control section 200, the preform is cooled in the atmosphere. In other words, the manufacturing apparatus 1 is provided with a cooling section 700 between the injection molding section 100 and the temperature control section 200. The aforementioned conversion section 150 is provided in the cooling section 700. Note that the term "cooling" in this specification does not refer to cooling to room temperature, but means natural cooling in the atmosphere.

[0031] The transfer mechanisms 600 and 650 are provided separately. The transfer mechanism 600 is configured to receive the preform 10 disposed at the delivery position P4 of the conversion mechanism 500 and transfer it to the temperature control section 200. The transfer mechanism 650 is configured to receive the preform 10 transferred to the temperature control section 200 by the transfer mechanism 600 and transfer the preform 10 and the container 20 along the transfer direction A over the temperature control section 200, the blow molding section 300, and the take-out section 400. As the transfer mechanisms 600 and 650, for example, a parallel movement chuck (hand) can be employed. The delivery of the preform between the conversion mechanism 500 and the transfer mechanism 600 and between the transfer mechanism 600 and the transfer mechanism 650 can be carried out by means known in the art to which this technology pertains, and a detailed description thereof will be omitted. The transfer by the transfer mechanisms 600 and 650 is carried out intermittently. Also, the interval (pitch) between the preform 10 and the container 20 can be configured to be changeable midway. For example, the transfer mechanism 600 can convert the interval (pitch) P1 of the injection molding section 100 to the interval P2 of the temperature control section 200 (P1 < P2), and the transfer mechanism 650 can convert the interval P2 of the temperature control section 200 to the interval P3 of the blow molding section 300 (P2 < P3), respectively. Further, the transfer mechanism 650 is configured to change the number of preforms 10 and containers 20 transferred by one intermittent transfer midway in the transfer path. Specifically, the transfer mechanism 650 is configured to intermittently transfer two preforms each up to the heat preservation temperature control section 230 and the fine adjustment section 240 described later, and then intermittently transfer one preform and one container each.

[0032] The temperature control unit 200 includes a first temperature control unit 210 that adjusts the temperature of the preform 10, a second temperature control unit 220 that adjusts the temperature of the preform 10 under conditions different from those of the first temperature control unit 210, a heat preservation temperature control unit 230 that suppresses the temperature drop of the temperature-controlled preform 10, and a fine adjustment unit 240 that finely adjusts the temperature of the preform 10.

[0033] The condition for adjusting the temperature of the preform 10 in the first temperature control unit 210 has a higher ability to lower the temperature of the preform 10 than the condition for adjusting the temperature of the preform 10 in the second temperature control unit 220. Here, "having a higher ability to lower the temperature" means that the preform 10 can be rapidly cooled compared to the comparison target. More specifically, it means that the temperature range of the preform dropped per unit time is large. For example, when the preform 10 is formed from polyethylene terephthalate, in the first temperature control unit 210, the temperature control of the preform 10 is performed from a state where the average temperature of the preform 10 is 135 to 160 °C to a state where the average temperature is 120 to 130 °C, and in the second temperature control unit 220, the temperature control of the preform 10 is performed from a state where the average temperature of the preform 10 is 120 to 130 °C to a state where the average temperature is 110 to 120 °C.

[0034] As the first temperature control unit 210 and the second temperature control unit 220, temperature control means such as a method of sandwiching the preform with a temperature control cavity type and a temperature control core type (temperature control rod type), a method of blowing air onto the preform, various infrared heater types, RED types, electromagnetic wave heating types, etc. can be adopted. As a preferred embodiment, the first temperature control unit 210 includes a temperature control core type and a temperature control cavity type configured to adjust the temperature of the preform 10 by sandwiching the preform 10, and the second temperature control unit 220 includes a temperature control blow core type that adjusts the temperature of the preform 10 by blowing gas onto the preform 10, and optionally a temperature control cavity type that houses the preform 10. Also, in this preferred embodiment, a preliminary blow for slightly expanding the preform 10 may be performed in the second temperature control unit 220 before transporting it to the blow molding unit 300.

[0035] In another preferred embodiment, in the first temperature control unit 210, gas is supplied and blown inside the preform 10 accommodated on the temperature control cavity side by a temperature control blow core mold, and the blown gas is continuously discharged to the outside of the preform, so that the temperature of the preform 10 is adjusted from the inside by convection. Another preferred embodiment may be to adopt a method in which in the second temperature control unit 220, gas is supplied and blown inside the preform 10 accommodated on the temperature control cavity side by a temperature control blow core mold, and the preform 10 is pre-blown without discharging the gas to the outside of the preform 10 during blowing.

[0036] In addition, in the above-mentioned first temperature control unit 210 and second temperature control unit 220, further, the outside of the preform 10 may be brought into contact with a temperature control cavity mold, and the temperature of the preform 10 may be adjusted from the outside by heat conduction. Also, the space (cavity) of the temperature control cavity for accommodating the preform 10 may be set to be larger in the second temperature control unit 210 than in the first temperature control unit 210. The first temperature control unit 210 and the second temperature control unit 220 are each configured to be able to control the temperature of two preforms. A temperature control medium (cooling medium) flows through the temperature control cavity mold and the temperature control core mold of the first temperature control unit 210 and the second temperature control unit 220. The temperature of the cooling medium at this time is set to, for example, 40°C to 100°C, preferably 50 to 70°C.

[0037] The heat preservation temperature control unit 230 is set to a temperature close to the blow molding temperature so as to prevent the temperature of the preform 10, which has been temperature-controlled to near the temperature suitable for blow molding, from decreasing. As the heat preservation temperature control unit 230, temperature control means such as various infrared heater types, RED types, electromagnetic wave heating types, etc. can be adopted. The heat preservation temperature control unit 230 is configured to be able to control the temperature of one preform (specifically, to suppress the temperature drop of the preform).

[0038] The fine adjustment unit 240 finely adjusts the temperature of the preform 10 to a temperature suitable for blow molding. Here, "fine adjustment" means making a fine temperature adjustment to a temperature suitable for blow molding over the entire preform 10. Specifically, it means intentionally varying the temperature of the preform for each part according to the shape of the container, or finely adjusting the temperature unevenness for each part of the preform 10. The fine adjustment unit 240 may be a local temperature adjustment unit that locally adjusts the temperature of the preform 10. The fine adjustment unit 240 can adopt temperature adjustment means such as an infrared heater type, RED type, electromagnetic wave heating type, and air cooling. The fine adjustment unit 240 is arranged immediately before the blow molding unit 300. The fine adjustment unit 240 is configured to be heatable or coolable so as to be able to adjust the temperature of one preform. Also, it may be configured to be able to simultaneously perform a heat treatment and a cooling treatment so that the upper part (directly below the neck part) of the body of the preform 10 can be locally heated while the central part to the lower part of the body can be cooled.

[0039] Next, the blow molding unit 300 will be described. In this example, the blow molding unit 300 includes a primary blow part 310 and a final blow part 320, and is configured to blow mold the container 20 in two steps. The primary blow part 310 includes a primary blow mold composed of, for example, a stretching rod, a blow core mold, and a blow cavity mold. The primary blow part 310 is configured to be able to form an intermediate molded product 15 by introducing air while stretching the preform 10 with, for example, a stretching rod. The final blow part 320 includes a final blow mold composed of, for example, a blow core mold and a blow cavity mold, and a stretching rod is provided as necessary. The final blow part 320 is configured to be able to form the container 20 by stretching the intermediate molded product 15 with, for example, air. Note that the blow cavity mold of the primary blow part 310 may be set to a higher temperature (for example, 110 to 140 °C) than the temperature of the blow cavity mold of the final blow part 320 (for example, 60 to 90 °C) in order to heat-treat the intermediate molded product 15.

[0040] Next, a method for manufacturing the container 20 by the manufacturing apparatus 1 will be described. FIG. 5 is a flowchart of the manufacturing process of the container 20. As shown in FIG. 5, the container 20 is manufactured by an injection molding step S1 of injection molding a plurality of preforms 10 along the arrangement direction C, a conversion step S1.5 of redirecting the plurality of preforms 10 arranged in the arrangement direction C so as to be aligned in the direction along the conveyance direction A, a temperature control step S2 of adjusting the temperature of the preforms 10, and a blow molding step S3 of molding the container 20 from the preforms 10, and is recovered from the manufacturing apparatus 1 in the take-out step S4. Hereinafter, the manufacturing method of the container 20 will be described with reference to FIG. 2 as well.

[0041] The injection molding step S1 includes an injection step S1-1 and a post-cooling step S1-2. In the injection step S1-1, molten resin is injected by the injection device 102 into an injection cavity formed by clamping an injection cavity mold 112, an injection core mold 122, and an injection neck mold 124 to mold the preform 10. After a predetermined time has elapsed since the injection, the preform 10 is released from the injection cavity mold 112, and the first rotating member 130 is rotated 180° to move the preform 10 held by the injection core mold 122 and the injection neck mold 124 from the injection position P1 to the post-cooling position P2.

[0042] Subsequently, in the post-cooling process S1-2, the preform 10 held by the injection core mold 122 and the injection neck mold 124 moved to the post-cooling position P2 is cooled for a predetermined time. The cooling of the preform 10 is performed from the inside by the injection core mold 122 and the injection neck mold 124 through which a refrigerant such as water flows inside. Further, after the preform 10 is moved to the post-cooling position P2, the cooling pod 140 is raised to accommodate the preform in the cooling pod 140. The cooling of the preform 10 is also performed from the outside by the cooling pod 140. At this time, in order to enhance the cooling efficiency of the post-cooling process S1-2, the body portion of the preform 10 may be sandwiched between the injection core mold 122 and the cooling pod 140 and strongly adhered (pressurized and deformed). Note that when the preform 10 is moved from the injection position P1 to the post-cooling position P2, since the preform 10 is cooled from the inside through the injection core mold 122a (122b), this moving time can also be regarded as a part of the initial post-cooling process S1-2.

[0043] Also, while the post-cooling process S1-2 of cooling the preform 10 held by the injection core mold 122 and the injection neck mold 124 at the post-cooling position P2 is being performed, another injection core mold 122 and injection neck mold 124 arranged at the injection position P1 perform the next injection process S1-1. That is, the next injection process S1-1 and the post-cooling process S1-2 are carried out in parallel. After a predetermined time, the preform 10 is released from the injection core mold 122 and the injection neck mold 124 and is in a state of being accommodated in the cooling pod 140. Subsequently, the cooling pod 140 is lowered to a height at which the conversion mechanism 500 can receive the preform 10. Thereafter, the first rotating member 130 is rotated again to perform the next injection process S1-1 and the post-cooling process S1-2. By repeating this process, the injection molding process S1 is continuously carried out.

[0044] In the subsequent conversion step S1.5, the preforms 10 accommodated in the cooling pod 140 and arranged in the arrangement direction C are held by the holding members 510a (510b) of the conversion mechanism 500 disposed at the receiving position P3. Thereafter, the cooling pod 140 is further lowered to make the preforms 10 rotatable by the second rotating member 520. Then, by rotating the second rotating member 520, the preforms 10 are moved from the receiving position P3 to the delivery position P4. During this time, the holding members 510a (510b) are rotated to align the preforms 10 in the direction extending in the conveying direction A. Then, the holding members 510a (510b) are raised, and the conveying mechanism 600 holds the preforms 10 and releases the preforms 10 from the holding members 510a (510b). Next, the conveying mechanism 600 intermittently feeds the preforms 10 to the temperature control unit 200 two by two, and the temperature control unit 200 transfers the preforms 10 from the conveying mechanism 600 to the conveying mechanism 650. Also, during the conversion step S1.5, the preforms 10 are air-cooled. Thereby, the temperature of the preforms 10 is equalized until they are transferred to the temperature control unit 200 (air-cooling step). Also, if necessary, a second post-cooling step of the preforms 10 is performed at the delivery position P4. Thereby, whitening (crystallization) due to slow cooling of the preforms 10 formed from the crystalline resin material (PET) that is likely to occur during air-cooling can be suppressed.

[0045] Also, while the conveying mechanism 600 is feeding out the preforms 10, the preforms 10 formed by the next injection molding step S1 are held by the holding members 510b (510a). After the feeding of the preforms 10 in the conveying direction A at the delivery position P4 is completed, by rotating the second rotating member 520, the preforms 10 formed by the next injection molding step S1 are moved from the receiving position P3 to the delivery position P4. By repeating this step, the conversion step S1.5 is continuously performed.

[0046] After transporting the preform 10 to the temperature control unit 200, the preform 10 is transported within the temperature control unit 200 by the transport mechanism 650 to perform the temperature control process S2. In the temperature control process S2, the preform 10 is sequentially transported to the first temperature control unit 210, the second temperature control unit 220, the heat preservation temperature control unit 230, and the fine adjustment unit 240, and the temperature of the preform 10 is adjusted to a temperature suitable for the next blow molding process S3. That is, the temperature control process S2 includes a first temperature control process S2-1, a second temperature control process S2-2, a heat preservation temperature control process S2-3b, and a fine adjustment process S2-3a. Note that the heat preservation temperature control process S2-3b and the fine adjustment process S2-3a are provided as needed and may be omitted. However, by providing the heat preservation temperature control process S2-3b, uniform temperature can be achieved accurately, and by providing the fine adjustment process S2-3a, the control of the shape of the container can be facilitated.

[0047] In the first temperature control process S2-1, the preform 10 is sandwiched and temperature-controlled by the temperature control core mold and the temperature control cavity mold of the first temperature control unit 210. In the second temperature control process S2-2, the preform 10 is temperature-controlled by blowing gas onto the preform 10 accommodated in the temperature control cavity mold as appropriate by the temperature control blow core mold of the second temperature control unit 220.

[0048] However, as another example, in the first temperature control process S2-1, in the first temperature control unit 210, gas is supplied and blown onto the inside of the preform 10 accommodated on the temperature control cavity side by the temperature control blow core mold, and the blown gas is continuously discharged to the outside of the preform, so that the temperature of the preform 10 can be adjusted from the inside by convection. As another example, in the second temperature control process S2-2, in the second temperature control unit 220, gas is supplied and blown onto the inside of the preform 10 accommodated on the temperature control cavity side by the temperature control blow core mold, and the preform 10 may be pre-blown without discharging the gas to the outside of the preform during blowing.

[0049] In addition, in the above-described first temperature control step S2-1 and second temperature control step S2-2, further, the outside of the preform 10 may be brought into contact with a temperature control cavity mold, and the temperature of the preform 10 may be adjusted from the outside by heat conduction. Also, the space (cavity) of the temperature control cavity that houses the preform 10 may be set to be larger in the second temperature control step S2-2 than in the first temperature control step S2-1.

[0050] In the heat preservation temperature control step S2-3b, the heat preservation temperature control unit 230 maintains the temperature of the preform 10 temperature-controlled in the first temperature control step S2-1 and the second temperature control step S2-2. In the fine adjustment step S2-3a, the fine adjustment unit 240 finely adjusts the temperature of the preform 10 to a temperature suitable for blow molding. In this embodiment, up to the heat preservation temperature control unit 230 and the fine adjustment unit 240, two preforms 10 are intermittently conveyed, and thereafter, one preform 10 and one container 20 are intermittently conveyed. That is, one of the two preforms 10 conveyed to the heat preservation temperature control unit 230 and the fine adjustment unit 240 shifts to the fine adjustment step S2-3a without going through the heat preservation temperature control step S2-3b.

[0051] After the fine adjustment step S2-3a of the temperature control step S2, the preform 10 is conveyed to the blow molding unit 300 by the conveying mechanism 650, and the blow molding step S3 is performed. In the blow molding step S3, the preform 10 is shaped into an intermediate molded product 15 by the primary blow unit 310 (primary blow step), and the intermediate molded product 15 is shaped into the container 20 by the final blow unit 320 (final blow step). After the blow molding step S3, the container 20 is conveyed to the take-out unit 400 by the conveying mechanism 650, and the container 20 is taken out. Through these steps, the container 20 can be obtained. Also, except for the fine adjustment step S2-3a, the average temperature of the preform 10 is adjusted to gradually decrease over the injection molding step S1, the conversion step S1.5, and the temperature control step S2. That is, as shown in Patent Document 2, the blow molding step S3 is performed using only the retained heat obtained by the preform 10 in the injection molding step S1 without reheating the preform in the temperature control step S2.

[0052] Next, a modified example of the above embodiment will be described with reference to FIGS. 6 and 7. Note that this modified example is the same as the above-described embodiment except that the configurations of the temperature control unit 200, the transport mechanism 650, and the blow molding unit 300 are different. Therefore, the same reference numerals will be given to the overlapping parts and the description thereof will be omitted.

[0053] The manufacturing apparatus 1001 according to the modified example includes a transport mechanism 1650 configured to intermittently transport two preforms 10 and two containers 20 at a time from the temperature control unit 1200 to the blow molding unit 1300. The manufacturing apparatus 1001 includes a first temperature control unit 210 and a second temperature control unit 220, and is provided with a temperature control unit 1200 having two fine adjustment units 240 instead of a heat preservation temperature control unit. The manufacturing apparatus 1001 includes two final blow units 320 each having a stretching rod, a blow core mold, and a blow cavity mold instead of a primary blow unit, and is provided with a blow molding unit 1300 configured to be able to blow-mold two containers 20 at a time. Thus, the manufacturing apparatus 1001 can manufacture two containers 20 simultaneously in the blow molding step S3. The temperature of the blow cavity mold included in the final blow unit 320 of the blow molding unit 1300 according to the modified example may be normal temperature (for example, 10 to 20°C).

[0054] As in the above modification example, in the present disclosure, it is possible to change the configuration according to the number of moldings in blow molding. Further, in the manufacturing apparatuses 1 and 1001 of the present disclosure, the number of containers (N2) blow-molded at one time is less than the number of preforms (N1) injection-molded at one time. For example, the number of each molding may be set as container: preform = 1:4, 2:4, or 2:6 (the ratio of N1 and N2 may be variable according to the specifications of the containers to be manufactured). In the manufacturing apparatuses 1 and 1001 of the present disclosure, the blow molding units 300 and 1300 include a final blow unit 320 that blow-molds N2 (N2 is an integer of 1 or more) containers 20 at a time. In the blow molding units 300 and 1300, the preforms 10 and the containers 20 are intermittently conveyed by N2 each. When one preform located at one end of a plurality of preforms 10 along the arrangement direction C in the injection molding unit 100 is defined as the first preform and one preform located at the other end is defined as the N1-th (N1 represents an integer of 2 or more) preform, N1 and N2 are in the relationship of N1 > N2. Since the number of pickups when molding containers in the blow molding process is small, the number of blow molding dies is reduced, and space saving of the manufacturing apparatus can be realized.

[0055] By the way, a technology has been developed to achieve high cycle operation, shorten the cooling time of the injection molding process, which is the rate-determining step, release the preform at a high temperature, and perform additional cooling of the preform in the downstream temperature control process (Japanese Patent No. 6505344). This technology is applied to an intermittent rotary transfer type or intermittent linear transfer type hot parison blow molding apparatus. Here, different from the intermittent rotary transfer type, the intermittent linear transfer type has advantages such as being able to change the take-up ratio between the injection molding section and the blow molding section, downsizing the blow mold, and performing local cooling of the preform during intermittent transfer. However, since the injection molded preform is usually divided in units of the number of blow moldings (the number of blow cavities) and intermittently transferred to the blow molding section, the waiting time length until it reaches the blow molding section varies for each unit, which causes a drawback that a temperature difference between preforms is likely to occur. Also, there are cases where it is desired to appropriately change the ratio of the number of injection moldings: the number of blow moldings, for example, to 2:1, 3:1, 4:1, according to the type of container. In the ratio of 4:1, the temperature difference between the preforms blown first and last becomes even more prominent.

[0056] The manufacturing method (manufacturing apparatus) of the present invention is a hot parison blow molding method (manufacturing apparatus), which is configured to divide the injection molded preform N1 into units of the number of blow moldings N2 (the number of blow cavities) and intermittently transfer it to the blow molding process, and a temperature difference between preforms is likely to occur for each unit. Hereinafter, the operation and function will be described based on the configuration of the manufacturing method, but the same operation and function are exhibited also in the configuration of the manufacturing apparatus corresponding to the configuration of the manufacturing method. In the manufacturing method of the above resin container, a multi-stage temperature control process S2 including at least a first temperature control process S2-1, a second temperature control process S2-2, and a fine adjustment process S2-3a, and further including a heat retention temperature control process S2-3b as needed, is implemented. By transporting the preform 10 to the blow molding process S3 through the multi-stage temperature control process S2, the difference in the temperature state between the preforms 10 can be reduced, and the container 20 can be blow molded, and a container with stable and good quality can be manufactured.

[0057] Also, by conveying the preform 10 and the container 20 along the conveying direction A intersecting the arrangement direction C over the temperature control step S2 and the blow molding step S3, the conveying mechanism can be simplified, the time required for conveying can be shortened, and the temperature of the preform 10 can be controlled. Further, in the injection molding step S1 described above, the preform 10 is injection molded along the arrangement direction C intersecting the conveying direction A in the temperature control step S2 and the blow molding step S3. Thereby, the injection port of the injection device 102 can be arranged at the central portion in the longitudinal direction of the cavity mold used in the injection molding step S1, and the injection device 102 itself can be arranged in the short side direction of the cavity mold (the direction along the conveying direction), and the occupied space required for manufacturing the resin container 20 can be reduced.

[0058] In addition to the temperature control step S2 including the first temperature control step S2-1, the second temperature control step S2-2, and the fine adjustment step S2-3a, by providing a cooling step between the injection molding step S1 and the temperature control step S2, the temperature of the preform 10 can be adjusted in more stages, the difference in temperature state between the preforms 10 can be further reduced, the container 20 can be blow molded, and a more stable and high-quality container 20 can be manufactured. Further, by cooling the preform 10 in the atmosphere between the injection molding step S1 and the temperature control step S2, the cooling time of the injection molding step S1 can be shortened, the injection molding step S1 can be repeated in a short time, and the production amount of the container 20 per unit time can be increased.

[0059] Also, at a stage shortly after the injection molding step S1 is completed, the temperature of the preform 10 is relatively high and deviates from the appropriate temperature for blow molding. On the other hand, as the blow molding step S3 is approached, it is required to adjust the temperature of the preform 10 to the appropriate blow temperature. By adopting conditions with a higher ability to lower the temperature of the preform 10 in the first temperature control step S2-1 than in the second temperature control step S2-2, the temperature of the preform 10 can be lowered in a short time at a stage shortly after the injection molding step S1 is completed, and the temperature of the preform 10 can be adjusted to the appropriate blow temperature in the second temperature control step S2-2. Thereby, a more stable and high-quality container 20 can be manufactured.

[0060] Also, according to a preferred embodiment of the first temperature control unit 210 and the second temperature control unit 220, in the first temperature control step S2-1, the temperature of the preform 10 can be lowered in a short time by sandwiching the preform 10 between the temperature control core mold and the temperature control cavity mold, and in the second temperature control step S2-2, the temperature of the preform 10 can be adjusted to the appropriate blow temperature by blowing gas onto the preform 10. Thereby, a container 20 with better quality can be manufactured more stably.

[0061] Also, in the aspect of pre-blowing the preform 10 in the temperature control step S2, an intermediate molded body can be formed before the blow molding step S3, and the container 20 can be blow molded from the intermediate molded body in the blow molding step S3. Thereby, in the preform 10 with a high weight used for blow molding a particularly large container 20, the preform 10 can be temperature-controlled well, and a container 20 with better quality can be manufactured more stably.

[0062] Also, when the fine adjustment step S2-3a is a local temperature control step, it becomes easier to blow mold the container into the target shape. Also, it becomes easier to blow mold a container with a special shape such as a large container provided with a handle.

[0063] Also, by having a conversion step S1.5 that changes the direction of the preforms 10 arranged in the arrangement direction C to be arranged in the direction along the conveyance direction A between the injection molding step S1 and the temperature control step S2, the preforms 10 can be smoothly transferred to the temperature control step S2 and the blow molding step S3. Thereby, while improving the production amount of the containers 20 per unit time, the quality of the containers 20 can be maintained or improved even under a short cycle time. Also, if a cooling step is carried out in the conversion step S1.5, cooling can also be carried out during the direction change of the preforms 10, and the containers can be manufactured more efficiently.

[0064] In addition, since the injection molding process S1 includes an injection process S1-1 and a post-cooling process S1-2, the preform 10 can be released from the cavity in a state where cooling is not completely finished in the injection process S1-1, and the cooling of the preform 10 can be continued in the post-cooling process S1-2. Then, while the cooling of the preform 10 is continued in the post-cooling process S1-2, the injection process S1-1 of the next preform 10 can be carried out, and the injection molding process S1 can be repeated in a short time, and the production amount of the containers 20 per unit time can be increased. That is, high-cycle container manufacturing can be realized. Further, even in the case of high cycle, since the temperature control process S2 includes a first temperature control process S2-1, a second temperature control process S2-2, and a fine adjustment process S2-3a, the temperature of the preform 10 can be controlled in multiple stages, so that the difference in temperature state between the preforms 10 can be reduced and the container 20 can be blow-molded, and a stable and high-quality container 20 can be manufactured.

[0065] In the method for manufacturing the resin container described above, the temperature control process S2 includes a heat preservation temperature control process S2-3b for suppressing the temperature drop of the preform 10. Thereby, it is possible to suppress the temperature of the preform 10 that has been temperature-controlled to the appropriate blow temperature from dropping during the standby time before blow molding, ensure the uniform temperature of the preform 10, and stably manufacture a high-quality container 20.

[0066] Further, even in a high-cycle method in which the injection molding process S1 is repeated in a short time to increase the production amount of the containers 20 per unit time, by providing the heat preservation temperature control process S2-3b, the uniform temperature of the preform 10 can be ensured, and a stable and high-quality container can be manufactured.

[0067] In addition, in the method for manufacturing the resin container described above, a multi-stage temperature control process S2 including a first temperature control process S2-1, a second temperature control process S2-2, a heat preservation temperature control process S2-3b, and a fine adjustment process S2-3a is carried out. By transporting the preform 10 to the blow molding process S3 through the multi-stage temperature control process S2, the difference in temperature state between the preforms 10 can be reduced and the container 20 can be blow-molded, and a more stable and high-quality container 20 can be manufactured.

[0068] Further, by cooling the preform 10 in the atmosphere between the injection molding step S1 and the temperature control step S2, the cooling time of the injection molding step S1 can be shortened, the injection molding step S1 can be repeated in a short time, and the production amount of the resin container 20 per unit time can be increased. Further, when the temperature control step S2 includes a first temperature control step S2-1, a second temperature control step S2-2, a heat retention temperature control step S2-3b, and a fine adjustment step S2-3a, by providing a cooling step between the injection molding step S1 and the temperature control step S2, the temperature of the preform 10 can be adjusted in more stages, the difference in temperature state between the preforms can be further reduced, and the container 20 can be blow molded, and a more stable and high-quality container 20 can be manufactured.

[0069] In the present disclosure, being linearly conveyed does not mean only referring to the case where it can be connected by exactly one straight line. Even in the case where it is conveyed by a plurality of conveying paths inclined at somewhat different angles respectively, the effect of alignment by the conversion mechanism 500 can be obtained. Further, in the present disclosure, by aligning the orientations of a plurality of preforms arranged at an angle inclined, for example, 30° to 150° with respect to the generally linearly extending conveying paths of the temperature control unit 200 and the blow molding unit 300 by the conversion mechanism 500, the effects of the present disclosure can also be obtained. Further, being orthogonal does not mean only referring to a strictly 90° angle, and includes, for example, those of about 90° ± 5°.

[0070] The temperature conditions of the first temperature control unit 210, the second temperature control unit 220, the heat retention temperature control unit 230, and the fine adjustment unit 240 may be finely adjusted for each conveyed preform.

[0071] Note that the present invention is not limited to the above-described embodiments, and can be freely deformed, improved, etc. as appropriate. In addition, the materials, shapes, dimensions, numerical values, forms, numbers, arrangement locations, etc. of the respective components in the above-described embodiments are arbitrary as long as the present invention can be achieved, and are not limited.

[0072] This application is based on Japanese Patent Application No. 2019-166591 filed on September 12, 2019 and Japanese Patent Application No. 2019-166592 filed on September 12, 2019, the entire contents of which are incorporated herein by reference. Also, all references cited herein are incorporated in their entirety.

Explanation of Reference Signs

[0073] 1,1001: Manufacturing apparatus, 10: Preform, 20: Container, 100: Injection molding section, 110: First injection mold, 112: Injection cavity mold, 120: Second injection mold, 122: Injection core mold, 124: Injection neck mold, 140: Cooling pod, 200, 1200: Temperature control section, 210: First temperature control section, 220: Second temperature control section, 230: Heat preservation temperature control section, 240: Fine adjustment section, 300, 1300: Blow molding section, 310: Primary blow section, 320: Final blow section, 400: Take-out section, 500: Conversion mechanism, 510a, 510b: Holding members, X1: First central axis, X2: Second central axis, A: Conveying direction, C: Arrangement direction, P1: Injection position, P2: Post-cooling position, P3: Receiving position, P4: Sending position, S1: Injection molding process, S1.5: Conversion process, S2: Temperature control process, S3: Blow molding process

Claims

1. An injection molding section for injection molding a plurality of resin preforms; A temperature control section for adjusting the temperature of the preforms; A blow molding section for molding a resin container from the preforms; A manufacturing apparatus for resin containers, comprising at least: The injection molding section includes: An injection device for injecting molten resin; A first injection mold which is a single injection cavity mold, and a plurality of recesses for defining the outer shapes of the bodies and bottoms of the plurality of preforms are formed in the injection cavity mold; An injection neck mold for defining the outer shapes of the necks of the plurality of preforms, and an injection core mold for defining the inner shapes of the necks, bodies and bottoms of the plurality of preforms, and a plurality of second injection molds; A cooling pod for accommodating and additionally cooling the preforms released from the injection cavity mold; Comprising at least: A conversion mechanism is provided between the injection molding section and the temperature control section for holding the preforms cooled by the cooling pod and transporting the preforms from the injection molding section to the temperature control section; The plurality of second injection molds are configured to sequentially exchange positions between the position where the first injection mold is arranged and the position where the cooling pod is arranged; The conversion mechanism has first and second holding members for simultaneously supporting a plurality of the preforms injection molded at the same time; The conversion mechanism is provided in a cooling section for air-cooling the preforms supported by the first and second holding members from the time when they are received from the cooling pod until the injection molding of the next preform is completed while sequentially exchanging the positions of the first and second holding members; A manufacturing apparatus for resin containers.

2. The number of the preforms blow molded simultaneously in the blow molding section is set to be smaller than the number of the preforms injection molded at one time in the injection molding section. The manufacturing apparatus for resin containers according to Claim 1. The manufacturing apparatus for resin containers according to Claim 1.

3. The injection molding section further has two of the second injection molds and a rotating member connected to the second injection molds; The rotating member intermittently rotates the two second injection molds by 180° with respect to each other between the position where the first injection mold is arranged and the position where the cooling pod is arranged, and transports them alternately. The manufacturing apparatus for resin containers according to Claim 2. The manufacturing apparatus for resin containers according to Claim 2.

4. The injection molding section includes: a first cooling unit that cools the preform in the first injection mold; a second cooling unit that cools the preform held in the second injection mold when the rotational member switches the positions of the two second injection molds; a third cooling unit that is the cooling pod for cooling the preform; and The manufacturing apparatus of a resin container according to claim 3.

5. The conversion mechanism provided in the cooling section functions as a fourth cooling section for cooling the preform. The manufacturing apparatus of a resin container according to claim 4.

6. A manufacturing method of a resin container including at least an injection molding step of injection molding a plurality of resin preforms, a temperature control step of adjusting the temperature of the preform, and a blow molding step of molding a resin container from the preform, The injection molding step is an injection cavity mold, and in the injection cavity mold, a first injection mold in which a plurality of recesses defining the outer shapes of the bodies and bottoms of the plurality of preforms are formed, and a neck mold defining the outer shape of the necks of the plurality of preforms and an injection core mold defining the inner shapes of the necks, bodies, and bottoms of the plurality of preforms. An injection step of injecting molten resin by an injection device into a molding space formed by closing the molds to mold the preform; a post-cooling step of accommodating the preform released from the injection cavity mold in a cooling pod and additionally cooling it; The manufacturing method includes a conversion step of holding the preform cooled in the cooling pod and transporting the preform from the injection molding step to the temperature control step. The injection molding step includes sequentially switching the positions of the plurality of second injection molds between the position where the first injection mold is disposed and the position where the cooling pod is disposed. The conversion step includes allowing the plurality of preforms supported by the first and second holding members that support the plurality of preforms injection molded simultaneously at one time to cool in the atmosphere from the time they are received from the cooling pod until the injection molding of the next preform is completed. A manufacturing method of a resin container.

7. The number of preforms blow molded simultaneously in the blow molding step is smaller than the number of preforms injection molded at one time in the injection molding step. The manufacturing method of the resin container according to claim 6.

8. The injection molding step has a rotary transfer step of rotating and moving a rotating member connected to the second injection mold, In the rotary transfer step, the two second injection molds are intermittently rotated 180° with respect to each other between the position where the first injection mold is arranged and the position where the cooling pod is arranged, and are alternately transferred. The manufacturing method of the resin container according to claim 7.

9. The injection molding step is a first cooling step of cooling the preform by the first injection mold, a second cooling step of cooling the preform held by the second injection mold when the positions of the two second injection molds are interchanged by the rotary transfer step, and a third cooling step which is the post-cooling step of cooling the preform by the cooling pod. The manufacturing method of the resin container according to claim 8.

10. The conversion step functions as a fourth cooling step of allowing the preform to cool. The manufacturing method of the resin container according to claim 9.

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