WO2020184563A1 - Procédé de fabrication d'un récipient en résine et appareil de fabrication d'un récipient en résine - Google Patents

Procédé de fabrication d'un récipient en résine et appareil de fabrication d'un récipient en résine Download PDF

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Publication number
WO2020184563A1
WO2020184563A1 PCT/JP2020/010313 JP2020010313W WO2020184563A1 WO 2020184563 A1 WO2020184563 A1 WO 2020184563A1 JP 2020010313 W JP2020010313 W JP 2020010313W WO 2020184563 A1 WO2020184563 A1 WO 2020184563A1
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WO
WIPO (PCT)
Prior art keywords
preform
temperature
resin container
temperature control
gas
Prior art date
Application number
PCT/JP2020/010313
Other languages
English (en)
Japanese (ja)
Inventor
大三郎 竹花
淳一 丸山
康秀 丸山
Original Assignee
日精エー・エス・ビー機械株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日精エー・エス・ビー機械株式会社 filed Critical 日精エー・エス・ビー機械株式会社
Priority to JP2021505082A priority Critical patent/JPWO2020184563A1/ja
Publication of WO2020184563A1 publication Critical patent/WO2020184563A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding

Definitions

  • the present invention relates to a method for manufacturing a resin container and an apparatus for manufacturing a resin container.
  • Patent Document 1 in a temperature control station provided with a temperature control pot and an air introduction core, air of a predetermined pressure is introduced into the injection-molded preform to bring the outer wall of the preform into close contact with the temperature control pod.
  • a method for cooling and imparting a temperature distribution is disclosed. Further, the document discloses that the contact time between the inner wall of the temperature control pod and the preform is about 5.5 seconds.
  • the container can be molded by securing the wall thickness of the portion most likely to be thin.
  • a method of controlling the temperature of the preform that can be performed is disclosed.
  • the injection-molded preform is heated and temperature-controlled in a temperature control device, and then placed on the side of the preform that tends to become thin when it is made into a container. Cooling air is blown from (horizontal direction).
  • the temperature distribution of multiple preforms immediately after injection molding tends 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 non-uniform and the same quality may not be produced. Further, if the preform alone does not have a temperature distribution suitable for manufacturing the container, the appearance and physical properties of the container alone may be poor.
  • An object of the present invention is to provide a method for manufacturing a resin container and an apparatus for manufacturing a resin container, which can manufacture a high-quality resin container even when the resin container is manufactured at high speed.
  • the method for manufacturing a resin container of the present disclosure that can solve the above problems is An injection molding process that injects a resin-made bottomed preform and A temperature control process that controls the temperature of the injection-molded preform while cooling it, A method for manufacturing a resin container, comprising a blow molding step of blowing-molding the temperature-controlled preform to manufacture a resin container.
  • a gas is blown from the outside of the preform to a high temperature part which is a part having a higher temperature than other parts in the preform. This is a method for manufacturing a resin container.
  • the resin container manufacturing apparatus of the present disclosure capable of solving the above problems is An injection molding part that injects a resin-made bottomed preform, A temperature control unit that controls the temperature of the injection-molded preform while cooling it, A device for producing a resin container, comprising a blow molding unit for producing a resin container by blow molding the temperature-controlled preform.
  • the temperature control part The preform is provided with a gas blowing portion for blowing gas from the outside of the preform. It is a manufacturing device for resin containers.
  • the present invention it is possible to provide a method for manufacturing a resin container and an apparatus for manufacturing a resin container, which can manufacture a high-quality resin container even when the resin container is manufactured at high speed.
  • FIG. 1 is a functional block diagram of the manufacturing apparatus 10.
  • the manufacturing apparatus 10 includes an injection molding section 11 for manufacturing the preform 20 and a temperature control section 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.
  • the manufacturing apparatus 10 includes a blow molding unit (an example of a blow apparatus) 13 for blowing the preform 20 to manufacture a container, and a take-out portion 14 for taking out the manufactured container.
  • the injection molding unit 11, the temperature control unit 12, the blow molding unit 13, and the take-out unit 14 are provided at positions rotated by a predetermined angle (90 degrees in this embodiment) about the transport means 16.
  • the transport 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 transported to each part as the rotating plate rotates.
  • the injection molding unit 11 shown in FIG. 1 includes an injection cavity type, an injection core type, a neck type, and the like, which are not shown.
  • a bottomed preform is formed by pouring a synthetic resin material such as a polyester resin (for example, PET: polyethylene terephthalate) from the injection device 15 into the preform-shaped space formed by molding these molds. 20 is manufactured.
  • the preform 20 has an optimum wall thickness distribution (shape) depending on the container, and the body thickness (average thickness, wall thickness) of the preform 20 is, for example, 1.0 to 8.0 mm, preferably 1.5 to. It is set to 3.5, more preferably 2.0 to 3.0 mm.
  • the temperature control unit 12 is configured to adjust the temperature of the preform 20 manufactured by the injection molding unit 11 while cooling it to a temperature suitable for final blowing.
  • the blow molding unit 13 includes a stretch rod, a blow core type, a blow cavity type, and the like (not shown).
  • the blow molding unit 13 stretches the preform 20 temperature-controlled by the temperature control unit 12 with, for example, a stretching rod, and introduces air from the blow core mold to inflate the preform 20 into a blow cavity type shape to inflate the container. It is configured to be moldable.
  • FIG. 2 is a diagram showing the configuration of the temperature control unit 12.
  • the temperature control unit 12 includes a device 30 having a plurality of gas blowing units 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 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 so as to communicate from the side surface to the upper surface thereof.
  • Ventilation can be performed from the side surface side to the upper surface side of the first fixing plate 31 or in the opposite direction.
  • a 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 height of the spacer member 33 in the vertical direction can be changed, and the distance between the preform 20 and the gas blowing portion 32 can be adjusted.
  • the number of gas blowing portions 32 is not particularly limited, but may be combined 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 controlling portion 12. Air is usually used as the gas to be blown from the gas blowing portion 32, but any gas such as nitrogen and argon that does not cause a problem in the resin container can be used.
  • the gas blowing portion 32 is located below the bottom portion 24 of the preform 20 which is conveyed to the temperature controlling portion 12.
  • the gas blowing portion 32 is composed of a nozzle.
  • the inclination angle ⁇ of the nozzle is adjustable.
  • the nozzle tilt angle ⁇ refers to the angle formed by the nozzle tilt direction B and the vertical direction A.
  • the nozzle can be tilted toward the back or front of the paper in FIG. 2, and the tilt angle ⁇ is a three-dimensional tilt angle with respect to the vertical direction A.
  • the device 30 includes a valve 34 configured so that the flow rate of the gas blown from the gas blowing portion 32 can be adjusted. Gas is supplied to the gas outlet 32 from a compressor or the like via a tube 36, and the flow rate can be adjusted by a valve 34. Although shown in a simplified manner in FIG. 2, the device 30 includes a number of valves 34 and tubes 36 corresponding to the gas outlet 32, and the flow rate of the gas blown from each gas outlet 32 is individually increased. It is possible to adjust (independently).
  • the temperature control unit 12 includes a temperature control rod 40 configured to be in contact with the inner surface of the body 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 at which the preform 20 can be temperature-controlled to a temperature suitable for blow molding.
  • the temperature control rod 40 is preferably set to a temperature equal to or lower than the glass transition point of the resin constituting the preform 20 (for example, 80 ° C. or lower in the case of PET).
  • FIG. 3 is a diagram showing a flowchart of a method for manufacturing a resin container.
  • the container of the present embodiment has an injection molding step S1 for injection molding the preform 20, a temperature control step S2 for controlling the temperature while cooling the preform 20, and a blow molding process for the temperature controlled preform 20. It is manufactured through the blow molding step S3 to be manufactured, and the container is taken out by opening the neck portion 22 from the neck mold 17.
  • the injection molding process S1 will be described.
  • a plurality of preforms are formed by pouring a resin material from the injection device 15 into a preform-shaped space formed by molding the injection cavity type, the injection core type, the neck type, and the like. 20 is manufactured.
  • the preform 20 is transferred from the injection molding section 11 to the temperature control section 12. Move.
  • heat exchange heat transfer
  • the temperature of the inner and outer surface layers of the preform 20 is set higher than that at the time of injection mold release. Raise to a higher temperature, eg 100-130 ° C.
  • the temperature control step S2 will be described with reference to FIGS. 2 and 4.
  • the temperature control rod 40 is brought into contact with the inner surface of the preform 20 that has been moved to the temperature control section 12.
  • the contact of the temperature control rod 40 is carried out by lowering the temperature control rod 40 from the upper standby position.
  • the temperature control rod 40 makes uniform surface contact with the inner surface of the preform 20 in the circumferential direction.
  • the temperature of the preform 20 is controlled while being cooled from the inside (inner surface layer side).
  • the device 30 gas blowing portion 32
  • the device 30 gas blowing portion 32
  • gas is blown from the gas blowing portion 32 to the high temperature portion 50 of the body portion 21 of the preform 20.
  • gas is blown from the gas blowing portion 32 located below the bottom portion 24 of the preform 20 toward the side surface of the body portion 21 of the preform 20.
  • the vertical direction here does not mean only the pure vertical direction, but also includes the diagonal direction.
  • the operation order of the temperature control rod 40 and the device 30 may be the reverse of the above operation. That is, the temperature control rod 40 and the device 30 may be moved up and down so as to adjust (cool) the temperature of the preform 20 after blowing gas onto the high temperature portion 50 of the body 21 of the preform 20.
  • the high temperature portion 50 of the preform 20 in the present application will be described with reference to FIG.
  • the high temperature part 50 is a part having a higher temperature than the other parts 52 in the preform 20.
  • the preform 20 tends to have an irregular temperature distribution in the circumferential direction due to temperature unevenness of the resin material, eccentricity of the mold (injection core type and injection cavity type), and the like. Therefore, if the cooling in the injection molding process is minimized, the high temperature portion 50 can exist. Further, as shown in FIG. 4, the high temperature portion 50 tends to extend in the vertical direction (from the bottom portion to the neck portion) of the preform.
  • each high temperature portion 50 may exist at a different position, for example, a different position in the circumferential direction.
  • a different position in the circumferential direction of the preform 20 when the preform 20 is viewed from the side in the temperature control portion 12 as shown in FIG. In one preform 20, the high temperature portion 50 is present on the right side, whereas in the other preform 20, the high temperature portion 50 is present on the left side.
  • gas is blown onto the high temperature portions 50 existing in each of the plurality of preforms 20 by adjusting the inclination angle ⁇ of each nozzle (gas blowing portion 32).
  • the position where the high temperature portion 50 exists is regular to some extent according to the molding conditions of the injection molding portion 11, the mold, and the like, it may be fixed as it is if an appropriate inclination angle ⁇ can be determined.
  • the determination of the appropriate tilt angle ⁇ may be carried out by identifying the hot spot 50 by checking the degree of uneven thickness of the container manufactured by the test run. Further, an appropriate inclination angle ⁇ may be determined by directly specifying the high temperature portion 50 of the preform 20 by thermography or the like.
  • the flow rate of the gas is adjusted by the valve 34 according to the degree of high temperature of the high temperature portion 50 of the preform 20, and the gas is blown to the preform 20.
  • the degree of high temperature of the high temperature portion 50 is also regular to some extent, it may be fixed as it is once an appropriate flow rate can be determined. The determination of the appropriate flow rate may be carried out by several test runs or the like.
  • the temperature of the preform 20 is eliminated while cooling the preform 20, and the temperature of the preform 20 is controlled to a temperature suitable for blow molding.
  • the blow molding step S3 will be described.
  • the preform 20 is housed in the blow cavity mold. Subsequently, while optionally stretching the preform 20 with a stretching rod, the preform 20 is inflated to the shape of a container by introducing blow air from the blow core mold to manufacture a container. After that, the container is opened from the mold of the blow molding unit 13, and the container is conveyed to the take-out unit 14 to take out the container. A container is manufactured by the above procedure.
  • the preform immediately after injection molding tends to have an uneven temperature distribution in the circumferential direction.
  • the reason for this is that there is temperature unevenness in the resin material kneaded by the injection device (screw), and that temperature unevenness occurs when the resin material passes through the narrow part, corner part, and branch part in the hot runner.
  • the injection core type is slightly eccentric with respect to the injection cavity type, and an uneven thickness / temperature unevenness is formed. If the temperature distribution of the preform is not uniform, the wall thickness of the manufactured container may become non-uniform, resulting in poor appearance and physical properties.
  • the temperature control part simply sticking the preform to the temperature control pod and cooling it will control the temperature of the high temperature part and the non-high temperature part of the preform in the same way, so that the temperature distribution of the preform will be uniform. It took a long time, and it was not enough to aim for further speedup.
  • gas is blown from the outside of the preform 20 to the high temperature portion 50 of the preform 20 while cooling the preform 20 in the temperature control step S2.
  • the gas sprayed from the outside onto the high temperature portion 50 can eliminate the uneven temperature of the preform 20, and can realize uniform temperature distribution of the preform 20 in a short time.
  • the manufacturing apparatus of the present embodiment by providing the preform 20 with a gas blowing portion 32 that blows gas from the outside of the preform 20, the unbalanced temperature of the preform 20 can be eliminated.
  • the temperature distribution of the preform 20 can be made uniform in a short time. As a result, a high-quality resin container can be manufactured even when the resin container is manufactured at high speed.
  • the temperature control rod 40 is brought into contact with the inner surface of the preform 20 (surface contact) to suppress the deformation of the preform 20, and the body portion of the preform 20 is suppressed from the inside.
  • the temperature can be adjusted while cooling the bottom 24 and the bottom 24.
  • the uneven temperature of the preform 20 can be eliminated by the gas blown from the outside.
  • the temperature control portion 12 is provided with the temperature control rod 40, so that the deformation of the preform is suppressed and the body and bottom 24 of the preform 20 are cooled from the inside. You can control the temperature while adjusting.
  • the uneven temperature of the preform 20 can be eliminated by the gas blown from the gas blowing portion 32.
  • rapid cooling of the preform 20 and elimination of the unbalanced temperature can be realized in a short time, and even when a resin container is manufactured at high speed, a higher quality resin container can be manufactured.
  • gas is blown to the high temperature portion 50 from the bottom 24 side of the preform 20 toward the side surface of the preform 20.
  • the gas blowing portion 32 since the gas blowing portion 32 is provided at the position on the bottom 24 side of the preform 20, the gas blowing portion 32 is directed from the bottom 24 side of the preform 20 toward the side surface of the preform 20. Gas can be sprayed on the high temperature portion 50. As a result, the gas can be efficiently sprayed on the high temperature portion 50 existing in the vertical direction of the preform 20, and the uneven temperature of the preform 20 can be efficiently eliminated.
  • the preform 20 immediately after injection molding tends to have an uneven temperature distribution in the circumferential direction. Unless the temperature distributions of all these preforms 20 are made uniform, it is not possible to simultaneously manufacture a plurality of high-quality resin containers.
  • the temperature distribution of the preforms 20 can be made uniform at the same time by blowing a gas onto the high temperature portion 50 of the preforms 20.
  • the standby time of the temperature control unit 12 is short (for example, 5.5 seconds or less (when the machine operating time is about 1.5 seconds, the temperature control processing time of the preform 20 is 4.0 seconds or less)).
  • the fact that the temperature distributions of the plurality of preforms 20 can be made uniform at the same time means that the temperature distributions of the plurality of preforms 20 are made uniform in one batch, and that the temperature distributions of the plurality of preforms 20 are made uniform at exactly the same time. Not intended.
  • the degree of high temperature of the high temperature portion of the preform immediately after injection molding may differ for the same reason that the temperature distribution in the circumferential direction tends to be uneven in the preform immediately after injection molding described above. .. Therefore, in order to equalize the temperature, it is desirable to blow a large flow rate of gas to a portion having a high temperature and a small flow rate of gas to a portion having a low temperature.
  • the uneven temperature state of the preform 20 is suitably eliminated even with a short standby time in the temperature control unit 12. It is possible to manufacture a high-quality resin container.
  • the gas blowing portion 32 is a nozzle, and the inclination angle ⁇ of the nozzle can be adjusted so that the nozzle is aligned with the high temperature portion 50 of the preform 20. Therefore, gas can be sprayed from the bottom 24 side according to the shape of the body of the preform 20. As a result, it is possible to more efficiently eliminate the uneven temperature of the preform 20. Further, by adjusting the inclination angle ⁇ for the plurality of preforms 20 and blowing gas onto each of the high temperature portions 50, the temperature distribution of each of the preforms 20 can be made uniform at the same time. As a result, even with a short standby time in the temperature control unit 12, it is possible to eliminate the uneven temperature state that differs for each preform 20, and it is possible to simultaneously manufacture a plurality of high-quality resin containers.
  • valve 34 which is configured so that the flow rate of the gas can be adjusted, it is possible to blow the gas at a flow rate corresponding to the degree of high temperature of each high temperature portion 50. It becomes. As a result, even with a short standby time in the temperature control unit 12, it is possible to eliminate the uneven temperature state that differs for each preform, and it is possible to simultaneously manufacture a plurality of high-quality resin containers.
  • the present invention is not limited to the above-described embodiment, and can be freely modified, improved, and the like as appropriate.
  • the material, shape, size, numerical value, form, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
  • FIG. 2 an example (FIG. 2) in which the gas blowing portion 32 is on the lower side with respect to the preform 20 has been described, but depending on the mode of transportation, the bottom 24 of the preform 20 faces upward and the gas blowing portion 32 may be arranged on the upper side.
  • a nozzle in which the gas blowing unit 32 blows gas supplied from an air compressor or the like has been described, but a fan with blades, a fan without blades, a circulator, or the like may be used. However, it is preferable to use a nozzle because the gas can be intensively blown to the locally existing high temperature portion 50.
  • the mode of changing the flow rate of the gas to be blown according to the degree of high temperature of the high temperature portion has been described, but the temperature of the gas to be blown may be changed.
  • it is preferable to change the flow rate of the gas because it is possible to eliminate the unbalanced temperature of the preform by a simple means.
  • a method for manufacturing a resin container in which a gas is blown from the outside of the preform to a high temperature portion which is a portion having a higher temperature than other portions in the preform.
  • the temperature control rod is brought into contact with the inner surface of the preform.
  • a gas is sprayed from the outside of the preform onto the high temperature portion of the preform.
  • a plurality of preforms are injection molded.
  • the temperature control step the temperature is controlled while cooling the plurality of preforms.
  • [6] In the temperature control step The method for producing 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 sprayed onto the preform.
  • a device for producing a resin container comprising a blow molding unit for producing a resin container by blow molding the temperature-controlled preform.
  • the temperature control part A device for manufacturing a resin container, which comprises a gas blowing portion for blowing gas from the outside of the preform onto the preform.
  • the temperature control section The resin container manufacturing apparatus according to [7], further comprising a temperature control rod that is in contact with the inner surface of the preform to control the temperature of the preform.
  • the gas blowing portion is provided at a position on the bottom side of the preform.
  • the resin container manufacturing apparatus according to [7] or [8].
  • the gas blowing portion is a nozzle.
  • the tilt angle of the nozzle is configured to be adjustable.
  • a valve configured to adjust the flow rate of the gas.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un récipient en résine qui comprend les étapes suivantes : le moulage par injection consistant à mouler par injection une préforme à fond (20) qui est formée à partir d'une résine; la régulation de la température consistant à refroidir et à réguler la température de la préforme moulée par injection (20); le moulage par soufflage consistant à fabriquer un récipient en résine par moulage par soufflage de la préforme à température régulée (20). Ce procédé de fabrication d'un récipient en résine est conçu de telle sorte que, à l'étape de régulation de la température, un gaz est soufflé vers une partie à haute température, dont la température est élevée par comparaison avec les autres parties de la préforme (20), depuis l'extérieur de la préforme (20).
PCT/JP2020/010313 2019-03-11 2020-03-10 Procédé de fabrication d'un récipient en résine et appareil de fabrication d'un récipient en résine WO2020184563A1 (fr)

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JP2019-043584 2019-03-11
JP2019043584 2019-03-11

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WO2020184563A1 true WO2020184563A1 (fr) 2020-09-17

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5356261A (en) * 1976-11-02 1978-05-22 Yamamura Glass Co Ltd Hollow molding method
JPS59230725A (ja) * 1983-06-13 1984-12-25 Katashi Aoki 射出延伸吹込成形法におけるパリソン温調方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5356261A (en) * 1976-11-02 1978-05-22 Yamamura Glass Co Ltd Hollow molding method
JPS59230725A (ja) * 1983-06-13 1984-12-25 Katashi Aoki 射出延伸吹込成形法におけるパリソン温調方法

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