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

Abstract

A method for producing a resin container, which comprises: an injection molding step for injection molding a bottomed preform (20) that is formed from a resin; a temperature control step for cooling and controlling the temperature of the injection molded preform (20); and a blow molding step for producing a resin container by blow molding the temperature-controlled preform (20). This method for producing a resin container is configured such that in the temperature control step, a gas is blown to a high-temperature portion, the temperature of which is high in comparison to the other portions of the preform (20), from the outside of the preform (20).

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 discloses a method in a temperature control station including a temperature control pot and a core for air introduction, in which air at a predetermined pressure is introduced into an injection-molded preform to bring the outer wall of the preform into close contact with the temperature control pot, and cooling and temperature distribution are performed. Further, the same document discloses that the contact time between the inner wall of the temperature control pot and the preform is about 5.5 seconds.

[0003] Patent Document 2 discloses a temperature control method for a preform that can form a container while ensuring the wall thickness of the thinnest part even in a container having a short part and a long part from the central axis of the neck part to the body part. In the temperature control method disclosed in the same document, after heating and temperature control of the injection-molded preform in a temperature control device, cooling air is blown from the side (horizontal direction) directly beside the preform to the part of the preform that is likely to become thin when formed into a container.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In recent years, further improvement in productivity of a hot parison type resin container manufacturing apparatus, specifically, further shortening of the molding cycle time has been eagerly desired. To increase the manufacturing speed of the container in the apparatus, shortening the cooling time in the injection molding process is effective.

[0006] If the cooling time in the injection molding process is shortened, the temperature distributions of a plurality of preforms immediately after injection molding tend to be uneven. If the temperature distributions of the plurality of preforms are not uniform, the wall thicknesses of the plurality of manufactured containers may become uneven, and there is a risk that they cannot be manufactured with equivalent quality. Also, if a single preform does not have a temperature distribution suitable for container manufacturing, there is a risk that appearance and physical property defects may occur in a single container.

[0007] An object of the present invention is to provide a method for manufacturing a resin container and a manufacturing apparatus for a resin container that can manufacture a high-quality resin container even when manufacturing a resin container at high speed.

Means for Solving the Problems

[0008] The method for manufacturing a resin container of the present disclosure that can solve the above problems is as follows. An injection molding step of injection molding a bottomed preform made of resin, A temperature control step of temperature-controlling while cooling the injection-molded preform, A blow molding step of blow molding the temperature-controlled preform to manufacture a resin container, which is a method for manufacturing a resin container having: In the temperature control step, Gas is blown from the outside of the preform onto a high-temperature part that is a part having a higher temperature compared to other parts in the preform. It is a method for manufacturing a resin container.

[0009] Also, the manufacturing apparatus for a resin container of the present disclosure that can solve the above problems is as follows. An injection molding part for injection molding a bottomed preform made of resin, A temperature control part for temperature-controlling while cooling the injection-molded preform, A blow molding part for blow molding the temperature-controlled preform to manufacture a resin container, which is a manufacturing apparatus for a resin container including: The temperature control part is The preform is provided with a gas blowing portion that blows gas from the outside of the preform. It is a manufacturing apparatus for a resin container.

Effect of the Invention

[0010] 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 that can manufacture a high-quality resin container even when manufacturing a resin container at high speed.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0012] 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 convenience of explanation.

[0013] First, with reference to FIG. 1, a manufacturing apparatus 10 for manufacturing a resin container will be described. FIG. 1 is a functional block diagram of the manufacturing apparatus 10.

[0014] As shown in FIG. 1, the manufacturing apparatus 10 includes an injection molding unit 11 for manufacturing a preform 20 and a temperature control unit 12 for adjusting the temperature of the manufactured preform 20. An injection device 15 for supplying a resin material as a raw material is connected to the injection molding unit 11. Further, the manufacturing apparatus 10 includes a blow molding unit (an example of a blow device) 13 for blowing the preform 20 to manufacture a container and a take-out unit 14 for taking out the manufactured container.

[0015] The injection molding section 11, the temperature control section 12, the blow molding section 13, and the take-out section 14 are provided at positions rotated by a predetermined angle (90 degrees in this embodiment) around the conveying means 16. The conveying means 16 is composed of a rotating plate or the like, and as shown in FIGS. 2 and 4 described later, the preform 20 or the container in a state where the neck portion 22 is supported by the neck mold 17 attached to the rotating plate is configured to be conveyed to each section as the rotating plate rotates.

[0016] The injection molding section 11 shown in FIG. 1 includes an injection cavity mold, an injection core mold, a neck mold, etc., which are not shown in the figure. By flowing a synthetic resin material such as a polyester-based resin (for example, PET: polyethylene terephthalate) from the injection device 15 into the space in the shape of a preform formed by clamping these molds, a bottomed preform 20 is manufactured. The preform 20 has an optimal wall thickness distribution (shape) according to the container, and its body wall thickness (average thickness, wall thickness) is set, for example, to 1.0 to 8.0 mm, preferably 1.5 to 3.5, and more preferably 2.0 to 3.0 mm.

[0017] The temperature control section 12 is configured to adjust the temperature of the preform 20 manufactured in the injection molding section 11 while cooling it to a suitable temperature for final blowing. The blow molding section 13 includes a stretching rod, a blow core mold, a blow cavity mold, etc., which are not shown in the figure. The blow molding section 13 is configured to be able to form a container by stretching the preform 20 temperature-controlled in the temperature control section 12 with, for example, a stretching rod and introducing air from the blow core mold to expand the preform 20 into the shape of the blow cavity mold.

[0018] Here, with reference to FIG. 2, the temperature control unit 12 will be described in detail. FIG. 2 is a diagram showing the configuration of the temperature control unit 12. As shown in FIG. 2, the temperature control unit 12 includes a device 30 having a plurality of gas blowing portions 32. The device 30 includes a gas blowing portion 32, a first fixing plate 31, a spacer member 33, a second fixing plate 35, a valve fixing portion 37, and a valve 34 and a tube 36 which will be described later. These are connected and unitized. The unit is fixed to the elevating device 40 of the manufacturing apparatus 10 via the second fixing plate 35. The first fixing plate 31 includes a through hole formed to communicate from its side surface to the upper surface. Through the through hole, ventilation can be performed from the side surface side to the upper surface side of the first fixing plate 31, or vice versa. The gas blowing portion 32 is installed on the upper surface where the through hole is located. A valve fixing portion 37 is formed on the side surface of the spacer member 33. The spacer member 33 can change its height in the vertical direction and is configured to be able to adjust the distance between the preform 20 and the gas blowing portion 32.

[0019] The number of the gas blowing portions 32 is not particularly limited, but may be matched with the number of preforms formed by injection molding. The gas blowing portion 32 is configured to blow gas from the outside onto the body portion 21 of the preform 20 conveyed to the temperature control unit 12. As the gas blown from the gas blowing portion 32, normal air (air) is usually used, but any gas that does not cause problems in a resin container, such as nitrogen or argon, can be used. Specifically, the gas blowing portion 32 is located below the bottom portion 24 of the preform 20 conveyed to the temperature control unit 12. In the present embodiment, the gas blowing portion 32 is constituted by a nozzle.

[0020] The tilt angle θ of the nozzle is configured to be adjustable. In FIG. 2, the tilt angle θ of the nozzle refers to the angle formed by the tilt direction B of the nozzle and the vertical direction A. Note that the nozzle can also be tilted in the depth or front-back direction of the paper surface of FIG. 2, and the tilt angle θ is a three-dimensional tilt angle with respect to the vertical direction A. It is preferable to adjust the tilt angle θ so that the gas outlet of the nozzle is located in a direction extending from the upper side to the lower side along the outer surface of the body portion 21 of the preform 20. Also, it is preferable that the position where the nozzle is installed is on the extension line of the central axis of the preform 20.

[0021] The apparatus 30 includes a valve 34 configured to be able to adjust the flow rate of the gas blown from the gas blowing portion 32. Gas is supplied to the gas blowing portion 32 from a compressor or the like via a tube 36, and the flow rate thereof can be adjusted by the valve 34. Although shown in a simplified manner in FIG. 2, the apparatus 30 includes a number of valves 34 and tubes 36 corresponding to the gas blowing portions 32, and the flow rate of the gas blown from each gas blowing portion 32 can be individually (independently) adjusted.

[0022] Also, the temperature control unit 12 includes a temperature control rod 40 configured to be able to contact the inner surface of the body portion 21 of the preform 20 conveyed from the injection molding unit 11. The temperature control rod 40 is configured to be able to move up and down. The temperature control rod 40 is set to a temperature capable of controlling the temperature of the preform 20 to a temperature suitable for blow molding. It is preferable that the temperature control rod 40 is set to a temperature below the glass transition point of the resin constituting the preform 20 (for example, 80° C. or less in the case of PET).

[0023] Subsequently, a method for manufacturing a container according to the present embodiment will be described. FIG. 3 is a diagram showing a flowchart of a method for manufacturing a resin container. The container of the present embodiment is manufactured through an injection molding step S1 of injection molding a preform 20, a temperature control step S2 of controlling the temperature while cooling the preform 20, and a blow molding step S3 of manufacturing a container by blow molding the temperature-controlled preform 20, and the container is taken out by releasing the neck portion 22 from the neck mold 17.

[0024] First, the injection molding process S1 will be described. In the injection molding process S1, a resin material is poured from the injection device 15 into a preform-shaped space formed by clamping an injection cavity mold, an injection core mold, a neck mold, etc., to manufacture a plurality of preforms 20. Immediately after the completion of the resin filling process or after a cooling process for a certain period of time (at least, for example, 1 / 2 or less of the resin filling process time) provided after the resin filling process, the preform 20 is moved from the injection molding section 11 to the temperature control section 12. During this movement, heat exchange (heat transfer) is performed between the surface layer (skin layer) and the inner layer (core layer) of the preform 20 to raise the temperature of the inner and outer surface layers of the preform 20 to a temperature higher than that at the time of injection mold release, for example, 100 to 130°C.

[0025] Next, the temperature adjustment step S2 will be described with reference to FIGS. 2 and 4. First, the temperature adjustment rod 40 is brought into contact with the inner surface of the preform 20 that has been moved to the temperature adjustment unit 12. The contact of the temperature adjustment rod 40 is performed by lowering the temperature adjustment rod 40 from the upper standby position. In the present embodiment, the temperature adjustment rod 40 makes surface contact with the inner surface of the preform 20 uniformly in the circumferential direction. By bringing the temperature adjustment rod 40 into contact with the inner surface of the preform 20, the preform 20 is temperature-adjusted while being cooled from the inside (inner surface layer side). Then, the device 30 (gas blowing unit 32) is raised from the lower standby position, and the gas blowing unit 32 is brought closer to the bottom portion 24 of the preform 20. With the temperature adjustment rod 40 in contact with the inner surface of the preform 20, gas is blown from the gas blowing unit 32 onto the high-temperature portion 50 of the body portion 21 of the preform 20. Specifically, gas is blown from the gas blowing unit 32 located below the bottom portion 24 of the preform 20 toward the side surface of the body portion 21 of the preform 20. Thereby, gas can be efficiently blown onto the strip-shaped high-temperature portion 50 existing in the longitudinal direction of the body portion 21 of the preform 20. Here, the longitudinal direction referred to here does not only refer to the pure vertical direction but also includes those in an oblique direction. After the gas blowing is completed, the temperature adjustment rod 40 is raised to the upper standby position, and the device 30 (gas blowing unit 32) is lowered to the lower standby position. Note that the operation order of the temperature adjustment rod 40 and the device 30 (gas blowing unit 32) may be the reverse of the above operation. That is, after gas is blown onto the high-temperature portion 50 of the body portion 21 of the preform 20, the temperature adjustment rod 40 and the device 30 may be raised and lowered so as to adjust (cool) the temperature of the preform 20.

[0026] Here, the high-temperature part 50 of the preform 20 in the present application will be described with reference to FIG. 4. The high-temperature part 50 is a part that is at a higher temperature compared to other parts 52 in the preform 20. Immediately after injection molding, the preform 20 is likely to have an uneven circumferential temperature distribution due to temperature unevenness of the resin material and eccentricity of the molds (injection core mold and injection cavity mold). Therefore, if the cooling in the injection molding process is minimized, the high-temperature part 50 may exist. Further, as shown in FIG. 4, the high-temperature part 50 tends to extend in the longitudinal direction of the preform (from the bottom to the neck part). Furthermore, when comparing a plurality of preforms 20, the respective high-temperature parts 50 may exist at different positions, for example, at different positions in the circumferential direction. As an example of the case where the high-temperature parts 50 of a plurality of preforms 20 exist at different positions in the circumferential direction of the preform 20, as shown in FIG. 4, when the preform 20 is viewed from the side in the temperature control unit 12, in one preform 20, the high-temperature part 50 exists on the right side, while in another preform 20, the high-temperature part 50 exists on the left side.

[0027] In the temperature control step S2, gas is blown onto the high-temperature part 50 existing in each of the plurality of preforms 20 by adjusting the inclination angle θ of each nozzle (gas blowing part 32). Here, since the position where the high-temperature part 50 exists is somewhat regular according to the molding conditions of the injection molding part 11, the mold, etc., once an appropriate inclination angle θ is determined, it may be fixed as it is. The determination of the appropriate inclination angle θ may be carried out by identifying the high-temperature part 50 by checking the degree of wall thickness unevenness of the container manufactured by a test run. Also, an appropriate inclination angle θ may be determined by directly identifying the high-temperature part 50 of the preform 20 by means of thermography or the like.

[0028] Also, in the temperature control step S2, according to the degree of high temperature of the high temperature portion 50 of the preform 20, the valve 34 adjusts the flow rate of the gas and blows the gas onto the preform 20. Here, since the degree of high temperature of the high temperature portion 50 is also regular to a certain extent, once an appropriate flow rate is determined, it may be fixed as it is. The determination of the appropriate flow rate may be carried out by several test runs or the like.

[0029] Through the above temperature control step S2, while cooling the preform 20, the uneven temperature of the preform 20 is eliminated, and the preform 20 is temperature-controlled to a temperature suitable for blow molding.

[0030] Next, the blow molding step S3 will be described. In the blow molding step S3, the preform 20 is accommodated in the blow cavity mold. Subsequently, while optionally stretching the preform 20 by a stretching rod, blow air is introduced from the blow core mold to expand the preform 20 into the shape of a container, thereby manufacturing the container. Then, the container is released from the mold of the blow molding section 13, and the container is conveyed to the take-out section 14 and taken out. Through the above procedure, the container is manufactured.

[0031] By the way, in order to increase the manufacturing speed of the container of the hot parison type blow molding machine (ISBM), shortening the cooling time of the injection molding step is effective. On the other hand, in order to suppress the appearance and physical property defects of the container caused by insufficient cooling of the preform accompanying the shortening of the cooling time of the injection molding step, it is conceivable to perform post-cooling after the injection molding step.

[0032] Here, as described above, the preform immediately after injection molding is likely to have a non-uniform temperature distribution in the circumferential direction. The reasons include the existence of temperature unevenness in the resin material kneaded by the injection device (screw), the occurrence of temperature unevenness when the resin material passes through the narrow parts, corners, and branch parts in the hot runner, and the injection core mold being slightly eccentric with respect to the injection cavity mold, resulting in uneven wall thickness and uneven temperature conditions, etc. If the temperature distribution of the preform is not uniform, the wall thickness of the manufactured container may be uneven, and there is a risk of appearance and physical property defects.

[0033] In the method of heating the preform in the temperature control section after ensuring sufficient cooling time of the preform in the conventional injection molding process, the temperature unevenness immediately after injection molding was eliminated by cooling in the injection molding process, so the above was not a serious problem. However, when shortening the cooling time of the injection molding process, there is a high possibility that molding defects of the container may occur due to the temperature unevenness immediately after injection molding. Due to this molding defect, it is impossible to manufacture a container that satisfies specifications such as appearance and physical properties, and there is also a risk that a plurality of containers of substantially the same quality cannot be manufactured simultaneously. In addition, simply attaching the preform to the temperature control pod in the temperature control section and cooling it equalizes the temperature control of the high-temperature part and the non-high-temperature part of the preform, so it takes time to equalize the temperature distribution of the preform, which is insufficient for aiming at further high speed.

[0034] In the manufacturing method of the present embodiment, while cooling the preform 20 in the temperature control step S2, gas is blown onto the high-temperature part 50 of the preform 20 from the outside of the preform 20. The uneven temperature of the preform 20 can be eliminated by the gas blown onto the high-temperature part 50 from the outside, and the temperature distribution of the preform 20 can be made uniform in a short time. Further, according to the manufacturing apparatus of the present embodiment, since the temperature control section 12 is provided with a gas blowing section 32 that blows gas onto the preform 20 from the outside of the preform 20, the uneven temperature of the preform 20 can be eliminated, and the temperature distribution of the preform 20 can be made uniform in a short time. Thereby, even when manufacturing a resin container at high speed, a high-quality resin container can be manufactured.

[0035] Further, in the manufacturing method of the present embodiment, by bringing the temperature control rod 40 into contact (surface contact) with the inner surface of the preform 20, while suppressing the deformation of the preform 20, the temperature can be adjusted while cooling the body portion and the bottom portion 24 of the preform 20 from the inside. Further, in combination with the temperature adjustment by the temperature control rod 40, the uneven temperature of the preform 20 can be eliminated by the gas sprayed from the outside. Further, according to the manufacturing apparatus of the present embodiment, since the temperature control unit 12 includes the temperature control rod 40, the temperature can be adjusted while suppressing the deformation of the preform and while cooling the body portion and the bottom portion 24 of the preform 20 from the inside. Further, in combination with the temperature adjustment by the temperature control rod 40, the uneven temperature of the preform 20 can be eliminated by the gas sprayed from the gas blowing unit 32. Thereby, rapid cooling of the preform 20 and elimination of uneven temperature in a short time can be realized, and even when manufacturing a resin container at high speed, a higher quality resin container can be manufactured.

[0036] Further, in the manufacturing method of the present embodiment, gas is sprayed from the bottom portion 24 side of the preform 20 toward the high temperature portion 50 on the side surface of the preform 20. Further, according to the manufacturing apparatus of the present embodiment, since the gas blowing unit 32 is provided at the position on the bottom portion 24 side of the preform 20, gas can be sprayed from the bottom portion 24 side of the preform 20 toward the high temperature portion 50 on the side surface of the preform 20. Thereby, gas can be efficiently sprayed onto the high temperature portion 50 existing in the longitudinal direction of the preform 20, and the elimination of the uneven temperature of the preform 20 can be efficiently realized.

[0037] Also, as shown in FIG. 4, the preform 20 immediately after injection molding is likely to have a non-uniform circumferential temperature distribution. If the temperature distributions of all these preforms 20 are not uniform, it is impossible to simultaneously manufacture a plurality of high-quality resin containers. In the method of this embodiment, when forming a plurality of preforms 20, by blowing gas onto the high-temperature part 50 of the preform 20, the temperature distribution of the preform 20 can be simultaneously made uniform. As a result, even under molding conditions where the waiting time of the temperature control unit 12 is short (for example, 5.5 seconds or less (when the mechanical operation time is about 1.5 seconds, the temperature control processing time of the preform 20 is 4.0 seconds or less)), the non-uniform temperature states different for each preform 20 can be eliminated, and a plurality of high-quality resin containers can be simultaneously manufactured. Note that being able to simultaneously make the temperature distributions of a plurality of preforms 20 uniform means making the temperature distributions of a plurality of preforms 20 uniform in one batch, and does not intend to make them uniform at exactly the same time.

[0038] Also, for the same reason as considered for the fact that the preform immediately after injection molding described above is likely to have a non-uniform circumferential temperature distribution, the degree of high temperature of the high-temperature part of the preform immediately after injection molding can also vary. Therefore, in order to equalize the temperature, it is desirable to blow a large flow rate of gas onto the part with a large degree of high temperature and a small flow rate of gas onto the part with a small degree of high temperature. In the method of this embodiment, by blowing a gas with a flow rate corresponding to the degree of high temperature of the high-temperature part 50, even with a short waiting time in the temperature control unit 12, the non-uniform temperature state of the preform 20 can be suitably eliminated, and a high-quality resin container can be manufactured.

[0039] Moreover, according to the manufacturing apparatus of the present embodiment, the gas blowing unit 32 is a nozzle, and since the inclination angle θ of the nozzle can be adjusted, the nozzle can be aligned with the high-temperature portion 50 of the preform 20, and gas can be blown from the bottom 24 side according to the shape of the body portion of the preform 20. Thereby, elimination of the uneven temperature of the preform 20 can be realized more efficiently. Further, by adjusting the inclination angle θ and blowing gas onto each high-temperature portion 50 for a plurality of preforms 20, the temperature distribution of each preform 20 can be simultaneously made uniform. Thereby, even with a short waiting time in the temperature adjustment unit 12, the uneven temperature state that differs for each preform 20 can be eliminated, and a plurality of high-quality resin containers can be manufactured simultaneously.

[0040] Moreover, according to the manufacturing apparatus of the present embodiment, by providing the valve 34 configured to be able to adjust the flow rate of the gas, it becomes possible to blow a gas having a flow rate corresponding to the degree of high temperature of each high-temperature portion 50. Thereby, even with a short waiting time in the temperature adjustment unit 12, the uneven temperature state that differs for each preform can be eliminated, and a plurality of high-quality resin containers can be manufactured simultaneously.

[0041] Note that the present invention is not limited to the above-described embodiments, and can be freely modified, improved, etc. as appropriate. In addition, the material, shape, dimensions, numerical values, form, number, arrangement location, etc. of each component in the above-described embodiments are arbitrary as long as the present invention can be achieved, and are not limited.

[0042] In the above-described embodiment, an example (FIG. 2) in which the gas blowing unit 32 is below the preform 20 has been described. However, depending on the mode of conveyance, the bottom 24 of the preform 20 may be upward and the gas blowing unit 32 may be arranged above.

[0043] In the above-described embodiment, an example of a nozzle that blows gas supplied from an air compressor or the like has been described for the gas blowing unit 32. However, a blower fan with blades, a blower fan without blades, a circulator, or the like may be used. However, it is preferable to employ a nozzle because gas can be blown intensively onto the locally existing high-temperature portion 50.

[0044] In the above-described embodiments, the mode of changing the flow rate of the gas to be sprayed according to the degree of high temperature of the high-temperature part has been described. However, the temperature of the gas to be sprayed may be changed. However, the mode of changing the flow rate of the gas is a simpler means to eliminate the uneven temperature of the preform and is preferable.

[0045] Hereinafter, the modes extracted from the above-described embodiments and their modifications are listed. [1] An injection molding step of injection molding a bottomed preform made of resin, A temperature control step of controlling the temperature while cooling the injection-molded preform, A blow molding step of blow molding the temperature-controlled preform to produce a resin container, which is a method for producing a resin container having In the temperature control step, A method for producing a resin container, in which gas is sprayed from the outside of the preform onto a high-temperature part that is a part having a higher temperature than other parts in the preform. [2] In the temperature control step, A temperature control rod is brought into contact with the inner surface of the preform, The method for producing a resin container according to [1], in which gas is sprayed from the outside of the preform onto the high-temperature part of the preform while the temperature control rod is in contact with the inner surface of the preform. [3] In the temperature control step, Gas is sprayed from the outside of the preform onto the high-temperature part of the preform, Thereafter, a temperature control rod is brought into contact with the inner surface of the preform. The method for producing a resin container according to [1]. [4] In the temperature control step, Gas is sprayed from the bottom side of the preform toward the side surface of the preform onto the high-temperature part of the preform. The method for producing a resin container according to any one of [1] to [3]. [5] In the injection molding step, a plurality of preforms are injection molded, In the temperature control step, a plurality of preforms are temperature-controlled while being cooled. The manufacturing method of the resin container according to any one of [1] to [4]. [6] In the temperature control step, A method for manufacturing a resin container according to any one of [1] to [5], wherein a gas having a flow rate corresponding to the degree of high temperature of the high temperature portion of the preform is blown onto the preform. [7] An injection molding section for injection molding a bottomed preform made of resin, A temperature control section for temperature control while cooling the injection molded preform, A manufacturing apparatus for a resin container, comprising a blow molding section for blow molding the temperature-controlled preform to manufacture a resin container, wherein the temperature control section is provided with a gas blowing section for blowing gas onto the preform from the outside of the preform. [8] The temperature control section is provided with a temperature control rod that contacts the inner surface of the preform to control the temperature of the preform, according to the manufacturing apparatus for a resin container described in [7]. [9] The gas blowing section is provided at a position on the bottom side of the preform, according to the manufacturing apparatus for a resin container described in [7] or [8].

[10] The gas blowing section is a nozzle, and the inclination angle of the nozzle is configured to be adjustable. according to the manufacturing apparatus for a resin container described in any one of [7] to [9].

[11] is provided with a valve configured to be able to adjust the flow rate of the gas. according to the manufacturing apparatus for a resin container described in any one of [7] to

[10] .

[0046] Note that this application is based on a Japanese patent application (Japanese Patent Application No. 2019-043584) filed on March 11, 2019, the whole of which is incorporated by reference. Also, all references cited herein are incorporated in their entirety.

Explanation of reference numerals

[0047] 10: Manufacturing device, 11: Injection molding section, 12: Temperature control section, 13: Blow molding section, 14: Take-out section, 15: Injection device, 16: Conveying means, 17: Neck mold, 20: Preform, 22: Neck portion, 24: Bottom portion, 30: Device, 32: Gas blowing section, 34: Valve, 40: Temperature control rod, 50: High-temperature site, S1: Injection molding process, S2: Temperature control process, S3: Blow molding process

Claims

1. An injection molding step of injection molding a bottomed preform made of resin, A temperature control step of temperature control while cooling the injection molded preform, A blow molding step of blow molding the temperature controlled preform to produce a resin container, which is a method for producing a resin container having, In the temperature control step, A temperature control rod is brought into contact with the inner surface of the preform, In a state where the temperature control rod is in contact with the inner surface of the preform, gas is blown from the outside of the preform toward a high temperature portion, which is a portion having a higher temperature compared to other portions in the preform, from the bottom side of the preform toward a part of the side surface of the preform, The high temperature portion is a portion extending in the longitudinal direction of the preform from the bottom of the preform to the neck portion of the preform. A method for manufacturing a resin container.

2. In the injection molding step, a plurality of preforms are injection molded, In the temperature control step, a plurality of preforms are temperature controlled while being cooled, The manufacturing method of the resin container according to claim 1.

3. In the temperature control step, Gas with a flow rate corresponding to the degree of high temperature of the high temperature portion of the preform is blown onto the preform. The manufacturing method of the resin container according to claim 1.

4. An injection molding unit for injection molding a bottomed preform made of resin, A temperature control unit for temperature control while cooling the injection molded preform, A blow molding unit for blow molding the temperature controlled preform to produce a resin container, which is a manufacturing apparatus for a resin container comprising, The temperature control unit, A temperature control rod that is brought into contact with the inner surface of the preform to control the temperature of the preform, A gas blowing unit that can adjust the inclination angle and blows gas from the outside of the preform toward a part of the side surface of the preform, The gas blowing unit is provided at a position on the bottom side of the preform, and the gas is blown toward a high temperature portion, which is a portion extending in the longitudinal direction of the preform from the bottom of the preform to the neck portion of the preform. A manufacturing apparatus for a resin container.

5. The gas blowing unit is a nozzle, The inclination angle of the nozzle is configured to be adjustable, The manufacturing apparatus for a resin container according to claim 4.

6. A valve configured to be able to adjust the flow rate of the gas is provided, The manufacturing apparatus for a resin container according to claim 4.

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