WO2022181618A1 - 温度調整用金型、樹脂製容器の製造装置および製造方法 - Google Patents

温度調整用金型、樹脂製容器の製造装置および製造方法 Download PDF

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Publication number
WO2022181618A1
WO2022181618A1 PCT/JP2022/007285 JP2022007285W WO2022181618A1 WO 2022181618 A1 WO2022181618 A1 WO 2022181618A1 JP 2022007285 W JP2022007285 W JP 2022007285W WO 2022181618 A1 WO2022181618 A1 WO 2022181618A1
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WO
WIPO (PCT)
Prior art keywords
preform
temperature
mold
temperature adjustment
axial direction
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/007285
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English (en)
French (fr)
Japanese (ja)
Inventor
清典 島田
知巳 土屋
幸一 池田
勇也 宮坂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissei ASB Machine Co Ltd
Original Assignee
Nissei ASB Machine Co Ltd
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 Nissei ASB Machine Co Ltd filed Critical Nissei ASB Machine Co Ltd
Priority to EP22759654.1A priority Critical patent/EP4299278B1/en
Priority to JP2023502443A priority patent/JP7554902B2/ja
Priority to US18/278,045 priority patent/US12485601B2/en
Priority to CN202280027397.6A priority patent/CN117120241A/zh
Publication of WO2022181618A1 publication Critical patent/WO2022181618A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C49/061—Injection blow-moulding with parison holding means displaceable between injection and blow stations
    • B29C49/062—Injection blow-moulding with parison holding means displaceable between injection and blow stations following an arcuate path, e.g. rotary or oscillating-type
    • 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
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6418—Heating of preforms
    • B29C49/6419—Heating of preforms from the inside
    • 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
    • B29C49/4252—Auxiliary operations prior to the blow-moulding operation not otherwise provided for
    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C49/643—Cooling of preforms from the inside
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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
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    • B29C49/6466—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms on the inside
    • 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
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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
    • 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
    • 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
    • B29C2049/065—Means for compensating or avoiding the shrinking of preforms, e.g. in the injection mould or outside the injection mould
    • 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
    • B29C49/48—Moulds
    • B29C49/4823—Moulds with incorporated heating or cooling means
    • B29C2049/4854—Heating or cooling from the inside of the cavity, e.g. using flames or other means
    • 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
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/786—Temperature
    • B29C2049/7861—Temperature of the preform
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • 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
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    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • 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
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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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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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
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    • B29C49/645—Thermal conditioning of preforms characterised by temperature differential through the preform length by cooling the neck
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages

Definitions

  • the present invention relates to a temperature control mold, a resin container manufacturing apparatus, and a manufacturing method.
  • a hot parison type blow molding machine has been known as one of the machines for manufacturing resin containers.
  • the hot parison type blow molding machine is configured to blow mold resin containers using the heat retained during injection molding of the preform. is advantageous in that it is possible to manufacture
  • preforms immediately after injection molding do not have a temperature distribution suitable for forming containers. Therefore, in the hot parison type blow molding cycle, in order to suppress the uneven temperature of the preform, or to give the preform a desired temperature distribution suitable for shaping the container, A preform temperature adjustment step is performed at .
  • a temperature control rod mold that follows the internal shape of the preform is inserted inside the preform, and the temperature is adjusted by bringing the inner peripheral surface of the preform and the temperature control rod mold into close contact.
  • the conventional temperature control rod type is not suitable for temperature control that gives a temperature difference in the axial direction because it is in close contact with the inner peripheral surface of the preform. Therefore, for example, it has been difficult to improve the thickness distribution of the container by locally cooling the portion corresponding to the thin-walled portion of the container from the inside of the preform while restricting the shrinkage deformation of the preform.
  • One aspect of the present invention is a temperature adjusting mold for adjusting the temperature of an injection-molded bottomed resin preform.
  • the temperature control mold is inserted into the preform and has a rod portion extending in the axial direction of the preform.
  • the rod portion has an annular protrusion projecting in a radial direction of the rod portion and coming into contact with the inner peripheral surface of the preform.
  • the rod portion contacts the bottom portion of the preform to restrict axial contraction of the preform.
  • the projection restricts the radial contraction of the preform, conducts heat between the rod and the preform, and adjusts the temperature at a predetermined portion of the preform in the axial direction.
  • FIG. 4 is a longitudinal section showing a configuration example of a temperature control unit;
  • FIG. 4 is a cross-sectional view of the vicinity of the protrusion of the temperature control unit;
  • FIG. 3 is a diagram showing a modification of FIG. 2;
  • FIG. 5 is a diagram showing a modification of FIG. 4;
  • FIG. 3 is a diagram showing another modification of FIG. 2;
  • It is a flowchart which shows the process of a blow-molding method.
  • FIG. 1 is a diagram schematically showing the configuration of the blow molding device 20 of this embodiment.
  • the blow molding apparatus 20 of the present embodiment is a hot parison method (also referred to as a one-stage method) in which the preform 10 is not cooled to room temperature, but the heat (internal heat) at the time of injection molding is utilized to blow mold the container. It is a device.
  • the blow molding device 20 includes an injection molding section 21 , a temperature adjustment section 22 , a blow molding section 23 , an ejection section 24 and a transport mechanism 26 .
  • the injection molding section 21, the temperature adjustment section 22, the blow molding section 23, and the ejection section 24 are arranged at positions rotated by a predetermined angle (for example, 90 degrees) around the transport mechanism .
  • the transport mechanism 26 includes a transport plate 28 (not shown in FIG. 1) that moves so as to rotate about an axis perpendicular to the plane of FIG.
  • One or more neck molds 27 (not shown in FIG. 1) for holding the necks of the preforms 10 or resin containers (hereinafter simply referred to as containers) are arranged on the transfer plate 28 at predetermined angles.
  • the conveying mechanism 26 moves the transfer plate 28 by 90 degrees, thereby transferring the preform 10 (or container) whose neck is held by the neck mold 27 to the injection molding section 21 , the temperature adjustment section 22 , and the blow molding section 23 . , to the take-out section 24 in that order.
  • the conveying mechanism 26 further includes an elevating mechanism (vertical mold opening/closing mechanism) and a mold opening mechanism for the neck mold 27, which is used to raise and lower the transfer plate 28, close and open the molds in the injection molding unit 21 and the like ( Mold release) is also performed.
  • an elevating mechanism vertical mold opening/closing mechanism
  • a mold opening mechanism for the neck mold 27 which is used to raise and lower the transfer plate 28, close and open the molds in the injection molding unit 21 and the like ( Mold release) is also performed.
  • the injection molding section 21 includes an injection cavity mold and an injection core mold (not shown), and manufactures the preform 10 shown in FIG.
  • the injection molding unit 21 is connected to an injection device 25 that supplies the resin material that is the raw material of the preform 10 .
  • the injection cavity mold, the injection core mold, and the neck mold 27 of the transport mechanism 26 are closed to form a preform-shaped mold space.
  • the preform 10 is manufactured in the injection molding section 21 by pouring the resin material from the injection device 25 into the mold space of such a preform shape.
  • the overall shape of the preform 10 is a bottomed cylindrical shape with one end open and the other end closed. A neck is formed at the end of the preform 10 on the opening side.
  • the material of the container and the preform 10 is a thermoplastic synthetic resin, which can be appropriately selected according to the application of the container.
  • specific types of materials include, for example, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PCTA (polycyclohexanedimethylene terephthalate), Tritan (Tritan (registered trademark): copolyester manufactured by Eastman Chemical Co.).
  • PP polypropylene
  • PE polyethylene
  • PC polycarbonate
  • PES polyethersulfone
  • PPSU polyphenylsulfone
  • PS polystyrene
  • COP/COC cyclic olefin polymer
  • PMMA polymethacrylic acid methyl: acryl
  • PLA polylactic acid
  • the neck mold 27 of the transport mechanism 26 is not opened and the preform 10 is held and transported as it is.
  • the number of preforms 10 simultaneously molded in the injection molding section 21 (that is, the number of containers that can be molded simultaneously in the blow molding device 20) can be appropriately set.
  • the temperature adjustment unit 22 equalizes and removes temperature variations in the preform 10 manufactured by the injection molding unit 21, and adjusts the temperature of the preform 10 to a temperature suitable for blow molding (for example, about 90° C. to 105° C.) and The temperature distribution is adjusted to suit the shape of the container to be formed.
  • the temperature control unit 22 also has a function of cooling the preform 10 in a high temperature state after injection molding.
  • FIG. 2 is a longitudinal sectional view showing a configuration example of the temperature adjustment section 22.
  • the temperature adjustment unit 22 includes a cavity mold (temperature adjustment pot mold, heating pot mold) 31 capable of accommodating the preform 10, and a temperature adjustment rod 32, which is a mold member inserted inside the preform. .
  • the cavity mold 31 has a space for temperature adjustment that has substantially the same shape as the outer shape of the preform 10 manufactured in the injection molding section 21 .
  • the cavity mold 31 is divided into at least three in the axial direction of the preform 10, and includes an upper mold 31a, a middle mold 31b and a lower mold 31c.
  • the upper die 31a is a die that faces (opposes) the outer peripheral surface of the preform 10 near the neck.
  • the intermediate die 31b is a die that faces the outer peripheral surface of the body of the preform 10 .
  • the lower mold 31c is a mold that faces the outer peripheral surface of the bottom of the preform 10 .
  • the bottom surface of the upper die 31a and the upper surface of the intermediate die 31b, and the bottom surface of the intermediate die 31b and the upper surface of the lower die 31c are engaged with each other by a spigot structure, for example, by sandwiching a heat insulating member therebetween.
  • Heating members such as band heaters (ring-shaped heaters) and rod-shaped heaters are attached to the upper mold 31a, the middle mold 31b and the lower mold 31c of the cavity mold 31, respectively.
  • the upper mold 31a, the middle mold 31b, and the lower mold 31c are each kept at a predetermined temperature by a heating member.
  • the temperature of the preform 10 is adjusted by heating the outer peripheral side of the preform 10 with the heat from the cavity mold 31 .
  • the body portion of the heated preform 10 shrinks and deforms toward the inner diameter side and the neck portion side.
  • the temperature distribution of the preform 10 in the axial direction can also be changed by changing the temperature of the heating members of the upper die 31a, middle die 31b and lower die 31c.
  • the temperature control rod 32 is an example of a rod portion (rod member), and is configured to be able to advance and retreat in the axial direction (vertical direction in the figure) with respect to the neck mold 27 holding the preform 10 with the temperature control portion 22 . be done.
  • FIG. 2 shows a state in which the temperature control rod 32 is moved downward (lowered) by a rod drive mechanism (not shown) and inserted into the neck mold 27 and the preform 10 .
  • the diameter of the temperature control rod 32 is set smaller than the inner diameter of the preform 10 . Also, the tip of the temperature control rod 32 inserted inside the preform 10 contacts the bottom of the preform 10 .
  • the axial length of the temperature control rod 32 is set to a length that assumes the amount of shrinkage of the preform 10 until the temperature control rod 32 is inserted after being carried out from the injection molding section 21 . Thereby, the temperature adjustment rod 32 has a function of maintaining the axial length of the preform 10 at a predetermined dimension during temperature adjustment and restricting excessive shrinkage of the preform 10 .
  • the temperature control rod 32 is kept at a predetermined temperature by the temperature control medium flowing inside.
  • the temperature control rod 32 is set to a lower temperature than the preform 10, and the preform 10 is cooled by the temperature control rod 32.
  • the preform 10 may be heated by the temperature control rod 32. It is possible.
  • the temperature adjusting rod 32 has an annular protrusion 33 that protrudes radially outward.
  • FIG. 3 is a cross-sectional view of the vicinity of the protrusion of the temperature control unit 22. As shown in FIG. In addition, illustration of the flow path in the temperature control rod 32 is omitted also in FIG.
  • the projecting portion 33 shown in FIGS. 2 and 3 is detachable from the temperature control rod 32 and is composed of a pair of half ring bodies 34 made of a material with good heat conductivity.
  • the half-split ring body 34 has an annular large-diameter portion (protruding portion 33 ) on the outer peripheral side, and its mounting position can be adjusted in the axial direction of the temperature control rod 32 .
  • the pair of half-split ring bodies 34 (projections 33) are fixed to the temperature control rod 32 by fixing means (not shown).
  • the protruding portion 33 functions to adjust the temperature of the predetermined portion of the preform 10 in the axial direction by coming into contact with the predetermined portion from the inside. Heat is conducted to the temperature control rod 32 via the protrusion 33 at the portion of the inside of the preform 10 that contacts the protrusion 33 . On the other hand, since air is present between the temperature control rod 32 and the preform 10, the heat of the temperature control rod 32 is less likely to be transferred to the portion inside the preform 10 that is not in contact with the protrusion 33 . Therefore, it is possible to adjust the temperature distribution in the axial direction of the preform 10 at the positions of the protrusions 33 .
  • the projecting portion 33 also has a function of maintaining the radial dimension of the preform 10 during temperature adjustment and restricting excessive shrinkage of the preform 10 .
  • the outer diameter of the protrusion 33 is appropriately set in consideration of the temperature adjustment time by the protrusion 33 according to the amount of shrinkage of the preform 10 . If the outer diameter of the protrusion 33 is increased, the shrinking preform 10 and the protrusion 33 will come into contact with each other relatively early, and the temperature adjustment time due to the contact with the protrusion 33 will be longer. On the other hand, if the outer diameter of the protrusion 33 is made smaller, the contact between the shrinking preform 10 and the protrusion 33 is delayed compared to the case where the outer diameter of the protrusion 33 is large, and the temperature adjustment time is shortened.
  • the outer diameter of the protrusion 33 by adjusting the outer diameter of the protrusion 33, the contact time between the predetermined portion of the preform 10 and the protrusion 33 is changed, and the temperature adjustment time for the predetermined portion of the preform 10 can be adjusted.
  • a plurality of types of half-ring bodies 34 having different outer diameters of the protrusions 33 are prepared, and the half-ring bodies 34 are appropriately exchanged according to specifications such as the shape of the container to be manufactured and the material of the preform 10. you can do it.
  • FIG. 2 shows an example in which the protrusion 33 is arranged in the axially intermediate portion of the temperature control rod 32 to cool the corresponding portion of the preform 10 that forms the shoulder of the container.
  • FIG. 4 is a modified example of FIG. 2, showing an example in which the vicinity of the boundary between the neck mold 27 and the upper mold 31a (the corresponding portion under the neck of the preform 10) is cooled by the projecting portion 33.
  • the protrusion 33 is formed of a pair of half-split ring bodies 34, as in the example of FIG.
  • burrs are formed in the gap between the neck mold 27 and the upper mold 31a or between the neck mold 27 and the upper surface of the blow mold. You can prevent it from happening.
  • FIG. 5 is a modification of FIG. 4, showing an example in which a protrusion 33 is integrally formed with the temperature control rod 32 at a position below the neck.
  • a protrusion 33 is integrally formed with the temperature control rod 32 at a position below the neck.
  • FIG. 6 is another modification of FIG. 2, showing a configuration example in which the temperature control rod 32 is covered with an annular contact ring 35 forming the projection 33 and a cylindrical spacer 36 . Since the configuration and function of the cavity mold 31 in FIG. 6 are the same as those in FIGS. 2 to 5, redundant description will be omitted.
  • the inner diameters of the annular contact ring 35 and the cylindrical spacer 36 are set to dimensions that allow the temperature control rod 32 to pass through. At least one or more contact rings 35 and at least one or more (more preferably two or more) spacers 36 are inserted into the temperature control rod 32 and arranged concentrically around the outer periphery of the rod body 32b of the temperature control rod 32. be. Note that FIG. 6 shows an example in which two contact rings 35 and two spacers 36 are attached to the temperature control rod 32 .
  • the outer diameter of the contact ring 35 is set larger than the outer diameter of the spacer 36.
  • a contact ring 35 attached to the temperature control rod 32 protrudes outward from the spacer 36 and comes into contact with the inside of the preform 10 to conduct the heat of the preform 10 to the temperature control rod 32 . Therefore, the contact ring 35 functions as the protrusion 33 that comes into contact with a predetermined portion of the preform 10 in the axial direction from the inside and adjusts (cools) the temperature of the predetermined portion.
  • a spacer 36 is attached to the temperature control rod 32 to axially position the contact ring 35 . Also, the spacer 36 does not come into contact with the preform 10 and functions to form an air layer between itself and the inner periphery of the preform 10, for example. As described above, the axial temperature distribution of the preform 10 can be adjusted at the position of the contact ring 35 .
  • the temperature control rod 32 has a tip piece 32a.
  • the tip piece 32a has a larger diameter than the rod body 32b, and is detachable from the tip of the rod body 32b.
  • the contact ring 35 and spacer 36 are inserted into the rod body 32b with the tip piece 32a removed.
  • the tip piece 32a is attached to the tip of the rod body 32b after the contact ring 35 and the spacer 36 are inserted through the rod body 32b, and prevents the contact ring 35 and the spacer 36 from coming off.
  • a stop pin (not attached) is inserted into each through hole formed in each of the temperature control rod 32 and the tip piece. ) is inserted, and the contact ring 35 and the spacer 36 are retained.
  • the spacer 36 and the tip piece 32 a function as fixing means for fixing the contact ring 35 (projection 33 ) to the temperature control rod 32 .
  • the same effect as in FIG. 2 can be obtained.
  • the outer diameter and number of the contact rings 35 and the axial position of the contact rings 36 defined by the spacers 36 can be appropriately changed by exchanging the contact rings 35 and the spacers 36 .
  • blow molding part 23 performs stretch blow molding on the preform 10 whose temperature has been adjusted by the temperature adjustment section 22 to manufacture a container.
  • the blow molding section 23 includes a blow cavity mold that is a pair of split molds corresponding to the shape of the container, a bottom mold, an extension rod, and an air introducing member (blow core mold, none of which are shown).
  • the blow molding section 23 blow molds the preform 10 while stretching it. As a result, the preform 10 can be formed into a blow-cavity shape to manufacture a container.
  • the removal section 24 is configured to release the neck of the container manufactured in the blow molding section 23 from the neck mold 27 and remove the container to the outside of the blow molding apparatus 20 .
  • FIG. 7 is a flow chart showing the steps of the blow molding method.
  • the mold adjusting step (S100) is performed before each step (S101 to S104) of the blow molding method described below is performed.
  • the mold adjusting step is a step of adjusting the position of the protrusion 33 of the temperature adjusting rod 32 according to the shape of the container to be formed. As an example, the following operations are performed in the mold adjustment process.
  • the axial position of the protrusion 33 of the temperature adjusting rod 32 is adjusted based on the container shape information.
  • the temperature adjustment time by the temperature adjustment rod 32 may be changed by changing the outer diameter of the protrusion 33 by changing the parts or the like.
  • the operator positions the protrusion 33 of the temperature control rod 32 so that the portion of the preform 10 corresponding to the thin-walled portion of the container contacts the protrusion 33 . adjust.
  • the portion of the preform 10 corresponding to the thin portion of the container is brought into contact with the projecting portion 33 and is locally cooled, thereby improving the thickness distribution of the container after adjustment.
  • the operator should place the protrusion 33 of the temperature control rod 32 near the boundary between the neck mold 27 and the upper mold 31a (the corresponding portion under the neck of the preform 10). Adjust to position.
  • the portion under the neck of the preform 10 is locally cooled, and the generation of burrs under the neck of the container is suppressed.
  • Step S101 Injection molding step
  • a resin is injected from the injection device 25 into the preform-shaped mold space formed by the injection cavity mold, the injection core mold, and the neck mold 27 of the transport mechanism 26, and the preform 10 is manufactured. be done.
  • step S101 when the injection molding of the preform 10 is completed, the injection molding part 21 is opened and the preform 10 is released from the injection cavity mold and the injection core mold. Next, the transfer plate 28 of the transfer mechanism 26 is rotated by a predetermined angle, and the preform 10 held by the neck mold 27 is transferred to the temperature adjustment section 22 .
  • Step S102 temperature adjustment step
  • the temperature adjustment unit 22 adjusts the temperature of the preform 10 to bring it closer to the temperature suitable for final blowing.
  • the preform 10 held by the neck mold 27 is accommodated in the cavity mold 31 by lowering the transfer plate 28 . Further, the temperature control rod 32 is inserted into the preform 10 by descending the temperature control rod 32 .
  • the preform 10 is heated from the outside by the cavity mold 31 in a non-contact state.
  • the temperature of the preform 10 is adjusted so that the temperature does not fall below the temperature suitable for blow molding, and the temperature deviation that occurs during injection molding is also reduced.
  • the contraction of the preform 10 causes the inner peripheral surface of the preform 10 to come into contact with the protrusions of the temperature control rod 32 , thereby locally cooling a predetermined portion of the preform 10 .
  • the transfer plate 28 of the transfer mechanism 26 is rotated by a predetermined angle, and the temperature-adjusted preform 10 held by the neck mold 27 is transferred to the blow molding section 23 .
  • Step S103 blow molding step
  • the blow molding of the container is performed in the blow molding section 23 .
  • the blow cavity mold is closed to accommodate the preform 10 in the mold space, and the air introduction member (blow core) is lowered so that the neck portion of the preform 10 is brought into contact with the air introduction member.
  • the stretching rod (longitudinal axis stretching member) is lowered to hold the bottom of the preform 10 from the inner surface, and the preform 10 is stretched as necessary while supplying blow air from the air introduction member. is transversely stretched.
  • the preform 10 is expanded and shaped so as to be in close contact with the mold space of the blow cavity mold, and is blow-molded into a container.
  • the bottom mold waits at a lower position where it does not contact the bottom of the preform 10, and quickly rises to the molding position before or after closing the mold.
  • Step S104 container take-out step
  • the blow cavity mold and the bottom mold are opened. Thereby, the container can be moved from the blow molding section 23 . Subsequently, the transport plate 28 of the transport mechanism 26 is rotated by a predetermined angle, and the container is transported to the pick-up section 24 . At the take-out station 24 , the neck of the container is released from the neck mold 27 and the container is taken out of the blow molding apparatus 20 .
  • the temperature control rod 32 of this embodiment has an annular protrusion 33 that protrudes radially and comes into contact with the inner peripheral surface of the preform 10 .
  • the protrusion 33 conducts heat between the temperature control rod 32 and the preform 10 .
  • a predetermined portion in the axial direction of the preform 10 can be cooled from the inside by the protrusion 33 to adjust the temperature, and the thickness distribution of the blow-molded container can be improved.
  • the tip of the temperature control rod 32 comes into contact with the bottom of the preform 10 to restrict the preform 10 from shrinking in the axial direction.
  • the protruding portion 33 contacts the inner peripheral surface of the preform 10 to restrict radial shrinkage of the preform 10 .
  • the protrusion 33 of this embodiment is provided on a half-split ring body 34 or a contact ring 35 that can be attached to and detached from the temperature adjustment rod 32, so that the position in the axial direction can be adjusted.
  • the position of the preform 10 at which the temperature is adjusted can be easily adjusted according to the specifications of the container.
  • the half ring body 34 or the contact ring 35 it is possible to change the radial projection amount of the protrusion 33.
  • the temperature adjustment time by the protrusions 33 can be adjusted by changing the timing of contact between the shrinking preform 10 and the protrusions 33 .
  • the thermal shrinkage rate is higher than that of PET and the like, and the preform 10 is easily contracted and deformed during temperature adjustment.
  • these materials do not have distortion hardening properties as compared with PET and the like, and it is difficult to adjust the wall thickness during blow molding.
  • Distortion hardening properties are defined as the point where the weakest part of the preform (usually the hottest part) first reaches its yield point during the blowing process, then the weakest part begins to stretch, until the wall thickness is uniform. , refers to the property of increasing its strength through molecular orientation.
  • a plurality of protrusions 33 may be provided in the axial direction of the temperature adjustment rod 32 .

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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)
PCT/JP2022/007285 2021-02-25 2022-02-22 温度調整用金型、樹脂製容器の製造装置および製造方法 Ceased WO2022181618A1 (ja)

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EP22759654.1A EP4299278B1 (en) 2021-02-25 2022-02-22 Temperature adjustment mold and device and method for producing resin container
JP2023502443A JP7554902B2 (ja) 2021-02-25 2022-02-22 温度調整用金型、樹脂製容器の製造装置および製造方法
US18/278,045 US12485601B2 (en) 2021-02-25 2022-02-22 Temperature adjustment mold and apparatus and method for producing resin container
CN202280027397.6A CN117120241A (zh) 2021-02-25 2022-02-22 温度调整用模具、树脂制容器的制造装置以及制造方法

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WO2025028477A1 (ja) * 2023-07-31 2025-02-06 日精エー・エス・ビー機械株式会社 温度調整用金型、樹脂製容器の製造装置および製造方法
KR20250146192A (ko) 2024-03-29 2025-10-13 가부시키가이샤 글라셀 인젝션 스트레치 블로우 성형의 성형 방법과 온조 로드

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US20240123671A1 (en) 2024-04-18
JPWO2022181618A1 (https=) 2022-09-01
JP7554902B2 (ja) 2024-09-20
US12485601B2 (en) 2025-12-02
CN117120241A (zh) 2023-11-24
EP4299278A1 (en) 2024-01-03

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