WO2024135785A1 - プリフォーム、射出成形金型、温調金型、樹脂製容器の製造方法、および樹脂製容器の製造装置 - Google Patents

プリフォーム、射出成形金型、温調金型、樹脂製容器の製造方法、および樹脂製容器の製造装置 Download PDF

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Publication number
WO2024135785A1
WO2024135785A1 PCT/JP2023/045980 JP2023045980W WO2024135785A1 WO 2024135785 A1 WO2024135785 A1 WO 2024135785A1 JP 2023045980 W JP2023045980 W JP 2023045980W WO 2024135785 A1 WO2024135785 A1 WO 2024135785A1
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WO
WIPO (PCT)
Prior art keywords
preform
neck
temperature
mold
resin container
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/JP2023/045980
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
純治 高橋
学 荻原
暢之 宇佐美
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 JP2024566138A priority Critical patent/JPWO2024135785A1/ja
Priority to CN202380091652.8A priority patent/CN120530008A/zh
Priority to EP23907145.9A priority patent/EP4640407A1/en
Priority to KR1020257023837A priority patent/KR20250124861A/ko
Publication of WO2024135785A1 publication Critical patent/WO2024135785A1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B29B11/08—Injection moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/261—Moulds having tubular mould cavities
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/73—Heating or cooling of the mould
    • B29C45/7306—Control circuits therefor
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • 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
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • 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
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • 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
    • 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
    • B29C49/58—Blowing 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
    • B29C49/64—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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • 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
    • 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
    • B29C49/42—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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages

Definitions

  • This disclosure relates to a preform, an injection molding die, a temperature-controlling die, a method for manufacturing a resin container, and an apparatus for manufacturing a resin container.
  • Patent Document 1 discloses a preform used in the manufacture of resin containers.
  • the shape of the preform must be appropriately selected or designed to match the shape of the plastic container. If the preform shape is not appropriate, molding defects such as poor distribution of wall thickness are likely to occur in certain parts of the plastic container during the molding process.
  • the present disclosure aims to provide a preform, an injection molding die, a temperature-controlling die, a method for manufacturing a resin container, and an apparatus for manufacturing a resin container that suppresses the occurrence of molding defects.
  • a preform according to one aspect of the present disclosure comprises: A preform manufactured in an injection molding section of a hot parison type blow molding machine and blow molded into a resin container in a blow molding section, a neck portion forming an opening in the preform; a body portion connected to the neck portion; a bottom portion connected to the body portion and closing one end of the preform; the body portion includes a connection portion connected to the neck portion and a thin body portion formed to have a smaller diameter than the neck portion, The neck portion and the connecting portion, and the connecting portion and the thin body portion are connected in an L-shape to form a step portion.
  • An injection molding die includes: An injection molding die used to manufacture a preform in an injection molding section of a hot parison type blow molding machine, an injection cavity formed by the injection molding die is composed of a neck forming portion which forms a neck portion of the preform, a body forming portion which forms a body portion connected to the neck portion, and a bottom forming portion which is connected to the body portion and forms a bottom portion which closes one end of the preform,
  • the body forming portion includes a connection portion forming portion connected to the neck forming portion, and a thin body forming portion formed narrower than the neck forming portion, The neck forming portion and the connection portion forming portion, and the connection portion forming portion and the thin body portion forming portion are connected in an L-shape to form a step portion forming portion.
  • a temperature control mold includes: A temperature control mold for controlling the temperature of the preform to a temperature suitable for blow molding, The temperature control mold is A heater provided so as to cover at least the connection portion; A cooling section provided on the bottom side of the heater; Equipped with.
  • a method for producing a resin container includes: A method for producing a resin container by blow molding the preform by a hot parison method, comprising the steps of: an injection molding step of injecting a molten resin into an injection cavity formed by an injection molding die to form the preform; A temperature control step of controlling the temperature of the preform to a temperature suitable for blow molding; and a blow molding step of blow molding the temperature-controlled preform.
  • An apparatus for manufacturing a resin container includes: A manufacturing apparatus for manufacturing a resin container by blow molding a preform by a hot parison method, an injection molding section that forms the preform by injecting molten resin into the injection cavity formed by the injection molding die; A temperature control unit that includes a temperature control mold and controls the temperature of the preform to a temperature suitable for blow molding; and a blow molding section for blow molding the temperature-controlled preform.
  • the present disclosure provides a preform, an injection molding die, a temperature-controlling die, a method for manufacturing a resin container, and an apparatus for manufacturing a resin container that suppresses the occurrence of molding defects.
  • FIG. 1 is a block diagram of a resin container manufacturing apparatus according to the present embodiment.
  • FIG. 2 is a perspective view of the preform according to the present embodiment.
  • FIG. 3 is a perspective view of the resin container according to this embodiment.
  • FIG. 4 is a diagram illustrating an injection molding section.
  • FIG. 5 is a diagram illustrating the temperature adjustment unit.
  • FIG. 6 is a diagram illustrating the blow molding section.
  • FIG. 7 is a diagram illustrating a method for manufacturing a resin container.
  • the "vertical direction” will be referred to as appropriate.
  • the “vertical direction” includes the “upward direction” and the “downward direction.”
  • the symbol U shown in the figures described below indicates the upward direction.
  • the symbol D indicates the downward direction. Unless otherwise specified, the direction in which the openings of the preform and the resin container are provided will be described as the upward direction.
  • FIG. 1 is a block diagram of a manufacturing apparatus 100 for a resin container 30 (see FIG. 3) according to this embodiment.
  • the manufacturing apparatus 100 manufactures the resin container 30 by blow molding a preform 20 (see FIG. 2) by a hot parison method.
  • the manufacturing apparatus 100 includes an injection molding section 110, a temperature adjustment section 120, a blow molding section 130, and an ejection section 140.
  • the injection molding section 110 manufactures a preform 20 (described later) by injecting molten resin from an injection device 111.
  • the temperature adjustment section 120 adjusts the temperature of the preform 20 to a temperature suitable for blow molding.
  • the blow molding section 130 manufactures the resin container 30 by blow molding the preform 20.
  • the ejection section 140 ejects the resin container 30 manufactured by the blow molding section 130.
  • the material constituting the preform 20 or the resin container 30 is a thermoplastic synthetic resin.
  • it can be selected from PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PCTA (polycyclohexane dimethylene terephthalate), Tritan (Tritan (registered trademark): a copolyester manufactured by Eastman Chemical Co.), PP (polypropylene), PE (polyethylene), PC (polycarbonate), PES (polyethersulfone), PPSU (polyphenylsulfone), PS (polystyrene), COP/COC (cyclic olefin polymer), PMMA (polymethyl methacrylate: acrylic), PLA (polylactic acid), etc.
  • the material of the preform 20 and the resin container 30 of this embodiment is most preferably PET.
  • the injection molding section 110, the temperature adjustment section 120, the blow molding section 130, and the removal section 140 are located at positions rotated a predetermined angle around the conveying means 150.
  • the predetermined angle is 90 degrees.
  • the conveying means 150 has a rotating plate (not shown).
  • a neck mold 151 (see FIG. 4), which will be described later, is attached to the rotating plate.
  • the preform 20 is conveyed to each of the injection molding section 110, the temperature adjustment section 120, the blow molding section 130, and the removal section 140 by the rotating plate rotating with the neck mold 151 holding the preform 20.
  • the resin container 30 may be conveyed only between the two sections, the blow molding section 130 and the removal section 140.
  • FIG. 2 is a perspective view of the preform 20 according to this embodiment.
  • the preform 20 includes a neck portion 21, a body portion 22, and a bottom portion 23.
  • the neck portion 21 forms the opening of the resin container.
  • the body portion 22 is connected to the neck portion 21.
  • the body portion 22 forms the side of the resin container by being blow molded.
  • the bottom portion 23 is connected to the body portion 22.
  • the bottom portion 23 closes one end of the preform 20, and forms the bottom surface of the resin container 30 by being blow molded.
  • the body 22 includes a connection portion 22a connected to the neck 21, and a thin body portion 22b formed with a smaller diameter than the neck 21.
  • the lower part of the neck 21 and the connection portion 22a are connected to the upper part of the connection portion 22a and the thin body portion 22b in an L-shape to form a step portion (recess) 22c.
  • the angle (angle) ⁇ between the central axis X of the preform 20 and the extension line of the outer surface of the connection portion 22a is preferably 70° to 90°, more preferably 80° to 89° (see FIG. 4).
  • angle (angle) ⁇ ' between the outer surface line (the line of the bottom surface) of the connection portion 22a of the preform 20 and the outer surface line (the line of the side surface) of the thin body portion 22b is preferably 90° to 110°, more preferably 91° to 100° (see FIG. 4).
  • FIG. 3 is a perspective view of a resin container 30.
  • the resin container 30 has a container neck 31, a container shoulder 32, a container body 33, and a container bottom 34.
  • the container neck 31 is a portion formed by the neck 21 of the preform 20, and forms the opening of the resin container 30.
  • the container shoulder 32 is a portion formed by a part of the body 22 of the preform 20 (a part of the body 22 on the neck 21 side), and is connected to the container neck 31.
  • the container body 33 is a portion formed by a part of the body 22 of the preform 20 (a part of the body 22 on the bottom 23 side), and is connected to the container shoulder 32.
  • the container bottom 34 is a portion formed by the bottom 23 of the preform 20, and is connected to the container body 33.
  • the container shoulder 32 is formed so that its diameter increases as it approaches the container bottom 34.
  • the injection molding section 110 includes an injection molding die 112.
  • the injection molding die 112 configures an injection cavity (molding space).
  • the injection molding die 112 includes an injection molding core 113 and an injection cavity type 114.
  • the injection molding die 112 may also include a neck type 151 that is also a part of the conveying means 150 during molding (temporarily).
  • the injection molding core 113 defines an injection cavity that mainly corresponds to the inner wall surface of the preform 20.
  • the injection cavity type 114, together with the neck type 151, defines an injection cavity that corresponds to the outer wall surface of the preform 20.
  • the neck mold 151 defines an injection cavity corresponding to the outer wall surface of the neck portion 21 of the preform 20, and the injection cavity mold 114 defines an injection cavity corresponding to the outer wall surface of the body portion 22 of the preform 20.
  • the neck mold 151 is an example of a neck forming portion.
  • the injection cavity mold 114 is an example of a body forming portion and a bottom forming portion.
  • the injection cavity mold 114 which is a body forming portion, includes a connection portion forming portion 114a and a thin body forming portion 114b.
  • the thin body forming portion 114b is formed to be narrower (smaller diameter) than the injection cavity surface of the neck mold 151.
  • the neck mold 151 and the connection portion forming portion 114a, and the connection portion forming portion 114a and the thin body forming portion 114b are connected in an L-shape (approximately right angle) to form a step portion forming portion.
  • the lines showing the outlines of the neck mold 151, the connection portion forming portion 114a, and the thin body portion forming portion 114b are crank-shaped.
  • the angle (angle) that the connection portion forming portion 114a forms with respect to the central axis X of the preform 20 is preferably 70° to 90°, more preferably 80° to 89°.
  • the angle that the outline line of the connection portion forming portion 114a forms with the outline line of the thin body portion forming portion 114b is preferably 90° to 110°, more preferably 91° to 100°.
  • the preform 20 further has characteristics related to the wall thickness distribution and shape, as exemplified in Fig. 4.
  • the thickness of the approximately vertical wall portion (excluding the threaded portion) constituting the neck portion 21 is T1
  • the thickness of the approximately horizontal wall portion constituting the connection portion 22a is T2
  • the thickness of the approximately tapered wall portion constituting the thin body portion 22b is T3.
  • the radius of curvature of the curved portion connecting the neck portion 21 and the connection portion 22a on the inner surface of the preform 20 is R1
  • the radius of curvature of the curved portion connecting the connection portion 22a and the thin body portion 22b is R2
  • the relationship of R2>R1 is established.
  • the diameter of the inner wall surface 131c of the blow cavity is preferably set to 2 to 4 times, preferably 2.6 to 3.7 times, relative to the diameter of the thin body 22b (the horizontal stretch ratio of the thin body 22b of the preform 20 is preferably set to 2 to 4 times, preferably 2.6 to 3.7 times).
  • connection portion 22a when the radial length of the connection portion 22a is D2, the radial length from the outer surface of the thin body 22b to the body forming portion 131e (container body 33) is D3, and the radial length from the outer radial end face of the connection portion 22a (or neck portion 21) to the shoulder forming portion 131d (diameter of the container shoulder) is D4, the relationships D3>D2 and D4>D2 are established. Furthermore, it is preferable that the lower end position of the connection portion 22a is set at a position higher than the lower end position P of the shoulder forming portion 131d (container shoulder portion 32) and the upper end position of the body forming portion 131e (body portion 22).
  • the temperature control unit 120 includes a temperature control mold member.
  • the temperature control mold member includes a temperature control mold (temperature control pot type) 121, a cooling rod (hollow rod member, temperature control rod) 122, and a fitting core 123.
  • the temperature control mold member may also include a neck type 151 that is also part of the conveying means 150 during molding (temporarily).
  • the inner wall surface of the temperature control mold 121 forms a temperature control cavity (molding space).
  • the temperature control cavity corresponds to the shape of the outer wall surface of the preform 20.
  • the cooling rod 122 is configured to be displaceable in the vertical direction.
  • a first ventilation port 122a is formed at the tip of the cooling rod 122.
  • the first ventilation port 122a is configured to introduce (supply) or extract (exhaust) compressed air through the inside of the cooling rod 122.
  • a second vent 122b is formed between the outer surface of the cooling rod 122 and the inner surface of the mating core 123. The second vent 122b is also configured to introduce (supply) or discharge (exhaust) compressed air.
  • the temperature-controlled mold 121 includes a heater (heating section) 121a and a cooling section 121b.
  • the heater 121a is provided so as to cover at least the connection section 22a.
  • the cooling section 121b is provided closer to the bottom section 23 than the heater 121a.
  • the heater 121a may be, for example, a ring heater 121a1, arranged at the upper part of the temperature-controlled mold 121 (the part including the connection section 22a and corresponding to the step section 22c).
  • the heater 121a heats the step section forming section of the preform 20 (at least the connection section 22a and its adjacent area) by radiant heat (radiation heat) from infrared rays or heat transfer by contact with the mold surface.
  • a heater 121a such as a band heater 121a2 may also be provided at the lower part of the temperature-controlled mold 121 (the part corresponding to the bottom section 23).
  • the cooling section 121b may be configured to flow a temperature control medium or a cooling medium through a flow path formed inside the temperature control mold (121.
  • the heater (heating section) 121a is set to a higher temperature than the cooling section 121b.
  • the blow molding section 130 includes at least a blow molding die 131, a stretch rod 132, and a blow core 133 that supplies and exhausts blow air (second compressed air) as blow molding die members.
  • the blow molding die members may also include a neck die 151 that is also part of the conveying means 150 during molding (temporarily).
  • the blow molding die 131 is composed of a pair of blow cavity split dies 131a and one bottom die 131b, and is configured to define the shape of the resin container 30 (the inner wall surface 131c of the blow cavity).
  • the blow cavity split die 131a includes a shoulder forming portion 131d that defines the container shoulder 32 and a body forming portion 131e that defines the container body 33.
  • the stretch rod 132 is configured to be displaceable in the vertical direction.
  • the stretch rod 132 is configured to contact the inner surface of the bottom 23 of the preform 20 transported to the blow molding section 130, stretching the preform 20 downward.
  • the blow core 133 abuts airtightly against the neck 21 of the preform 20, supplies blow air to the preform 20, and exhausts the blow air from the molded resin container 30.
  • FIG. 7 illustrates an example of the method for manufacturing a resin container.
  • the method for manufacturing a resin container includes an injection molding process S1, a temperature adjustment process S2, and a blow molding process S3.
  • the manufacturing method of this embodiment further includes a container removal process S4.
  • the injection molding process S1 includes injecting molten resin into an injection cavity formed by an injection mold 112 to form a preform 20.
  • the molten resin injected into the injection cavity by the injection device 111 is cooled by the injection mold 112 to form the preform 20.
  • the connection portion forming portion 114a forms the inner wall surface of the injection cavity corresponding to the connection portion 22a
  • the thin body forming portion 114b forms the inner wall surface of the injection cavity corresponding to the thin body 22b.
  • the neck forming portion which is the neck mold 151 and the connection portion forming portion 114a, and the connection portion forming portion 114a and the thin body forming portion 114b are connected in an L-shape, so that the neck portion 21 and the connection portion 22a, and the connection portion 22a and the thin body 22b of the preform 20 are also formed so as to be connected in an L-shape. Therefore, the lines showing the outline of the neck portion 21, the connection portion 22a, and the thin body portion 22b of the preform 20 are crank-shaped.
  • the preform 20 may be released from the injection molding die 112 at a high temperature.
  • the cooling time is set to 1/2 or less of the filling time, preferably 1/3 or less, and more preferably 0 seconds, and the preform 20 is released from the injection molding die 112 in a state where the heat retention is high.
  • the preform 20 released from the injection molding die 112 is transported to the temperature adjustment unit 120 while being held by the neck die 151.
  • the size relationship of the gap (space) in each part of the injection cavity is the same as the size relationship of the thickness in each part of the preform 20.
  • the temperature control step S2 includes adjusting the temperature of the preform 20 to a temperature suitable for blow molding. Specifically, the preform 20 transported from the injection molding section 110 to the temperature control section 120 is adjusted to a temperature suitable for blow molding by contacting the temperature control mold 121. In the temperature control step S2, it is desirable that at least the connection section 22a is heated. The heater 121a heats at least the connection section 22a, and the cooling section 121b cools at least the thin body section 22b separated from the connection section 22a.
  • the heater 121a can locally suppress the decrease in heat quantity (temperature decrease) of the connection section 22a due to compressed air, and can also locally increase the heat quantity (temperature) of the connection section 22a compared to when it was released from the mold by injection, if necessary.
  • the bottom section 23 may be cooled by providing a cooling section 121b to cover the bottom section 23, or may be heated by providing a heater near the bottom section 23.
  • the temperature control step S2 of this embodiment includes introducing compressed air into the inside of the preform 20 through the first vent 122a after the preform 20 is formed.
  • the outside (outer surface) of the preform 20 is brought into contact with the temperature control cavity (the inner wall surface of the temperature control mold 121) of the temperature control mold 121 by introducing compressed air from the first vent 122a provided on the cooling rod 122 inserted into the inside of the preform 20 or the second vent 122b provided on the fitting core 123.
  • compressed air continues to be introduced from the first vent 122a or the second vent 122b, and the preform 20 is cooled from the inside (inner surface).
  • the introduced compressed air is discharged through the first vent 122a or the second vent 122b that is not responsible for introducing compressed air. Therefore, the outside of the preform 20 (the preform 20 from the outside) is cooled and temperature-regulated by contact with the temperature-regulating mold 121, and the inside of the preform 20 (the preform 20 from the inside) is cooled by introducing compressed air and continuing to flow through it. This allows the preform 20 to be cooled quickly in the temperature regulation step S2.
  • the preform 20, which has been cooled to a temperature suitable for blow molding in the temperature regulation section 120, is transported to the blow molding section 130 while still being held by the neck mold 151.
  • the blow molding process S3 includes blow molding the preform 20 with the second compressed air (blow air) to produce a resin container.
  • the blow molding process S3 of this embodiment further includes stretching the preform 20 by displacing (lowering) the stretch rod 132.
  • the second compressed air is set to a higher pressure than the compressed air used in the temperature adjustment process S2.
  • the preform 20 transported from the temperature adjustment section 120 to the blow molding section 130 is housed in the blow molding die 131, and then the inner surface of the bottom 23 is brought into contact with the stretch rod 132 and stretched downward.
  • the preform 20 is then blow molded by introducing blow air into the interior of the preform 20 from the blow core 133 abutting the neck section 21.
  • the preform 20 is deformed by blow molding into a shape corresponding to the inner wall surface 131c of the blow cavity defined by the blow molding die 131, and becomes a resin container 30.
  • the distance D1 from the connection section 22a to the blow molding die 131 that constitutes the inner wall surface 131c of the blow cavity is longer than that of a preform having a body that gradually narrows from the neck section to a specific outer diameter, as disclosed in Patent Document 1. Because the temperature control process S2 ensures sufficient heat in the connection portion 22a, the connection portion 22a is appropriately stretched and thinned, preventing unnecessary thickening of the container shoulder portion 32. The manufactured resin container is transported to the removal section 140 while still held by the neck mold, and is removed from the manufacturing device 100 in the container removal process S4.
  • the preform is manufactured or designed to have an optimal shape by working backwards from the shape of the resin container to be manufactured.
  • a preform with an optimal shape is less likely to cause molding defects in the manufacture of resin containers, and the amount of plastic waste can be reduced.
  • the optimal preform shape often differs between narrow-mouth containers and wide-mouth containers.
  • narrow-mouth container a preform shape in which the upper part of the body just below the neck is strongly deflated and the lower part of the body is gently deflated toward the bottom is preferable.
  • a preform shape in which the body just below the neck is gradually deflated toward the bottom and the body is approximately tapered is preferable.
  • the heat distribution derived from injection molding varies greatly depending on the shape and thickness distribution of the preform, which greatly affects the degree of stretching during blow molding, so the design of the preform shape is very important.
  • a predetermined value e.g., an opening size between a wide-mouth container and a narrow-mouth container
  • connection portion 22a and the thin body portion 22b are provided with a reduced diameter toward the central axis X of the preform 20.
  • This increases the distance D1 until the connection portion 22a and the thin body portion 22b reach the inner wall surface of the blow cavity during blow molding, so that a high stretch ratio can be ensured in the connection portion 22a and the thin body portion 22b, and molding defects can be suppressed.
  • connection portion 22a that is held away from the temperature control mold 121 increases (the connection portion 22a does not come into contact with the cooling portion 121b and is therefore less likely to be cooled). This makes it easier to maintain the heat retained in the connection portion 22a, which is the portion of the body portion 22 that is connected to the neck portion 21. This suppresses molding defects that occur due to a lack of retained heat in the body portion 22 near the neck portion 21.
  • the neck mold 151 and the connection part forming part 114a which are the neck forming part, and the connection part forming part 114a and the thin body part forming part 114b are connected in an L-shape to form a step part forming part. Therefore, by injecting molten resin into the injection cavity formed by the step part forming part, a preform 20 can be manufactured in which the neck part 21 and the connection part 22a, and the connection part 22a and the thin body part 22b are bent in an L-shape.
  • the preform 20 of this shape which can increase the stretch ratio directly below the neck part, is blow molded, thereby suppressing the occurrence of molding defects.
  • the manufacturing method for a resin container is a manufacturing method in which the above preform 20 is blow molded by the hot parison method to manufacture a resin container. Therefore, it is possible to suppress the occurrence of molding defects in the resin container.
  • the angle ⁇ between the central axis X of the preform 20 and the connection portion 22a is 70° to 90°.
  • the connection portion forming portion 114a is configured so that the angle ⁇ with respect to the central axis X of the preform 20 is 70° to 90°.
  • the temperature-controlled mold 121 of the above configuration is equipped with a heater 121a and a cooling section 121b. Furthermore, in the above-mentioned method for manufacturing a resin container, at least the connection section 22a is heated. This ensures that the body section 22 (connection section 22a) near the neck section 21 has sufficient retained heat. This prevents molding defects caused by insufficient retained heat.
  • the preform 20 is released from the injection mold 112 at a high temperature, and in the temperature control step S2, compressed air is introduced into the inside of the preform 20.
  • the injection molding section 110 of this embodiment is configured to release the preform 20 from the injection mold 112 at a high temperature, and the temperature control section 120 is equipped with a mechanism for cooling the preform 20 with compressed air or the like.
  • it is essential to shorten the time for the injection molding step S1.
  • the preform is slowly cooled in the temperature control step S2, appearance defects such as whitening may occur.
  • the outside of the preform 20 is cooled by contacting the inner wall surface of the temperature control mold (temperature control pot mold), and the inside of the preform 20 is cooled by introducing compressed air, so the cooling speed of the preform 20 is improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
PCT/JP2023/045980 2022-12-21 2023-12-21 プリフォーム、射出成形金型、温調金型、樹脂製容器の製造方法、および樹脂製容器の製造装置 Ceased WO2024135785A1 (ja)

Priority Applications (4)

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JP2024566138A JPWO2024135785A1 (https=) 2022-12-21 2023-12-21
CN202380091652.8A CN120530008A (zh) 2022-12-21 2023-12-21 预成型坯、注塑成型模具、温度调节模具、树脂制容器的制造方法以及树脂制容器的制造装置
EP23907145.9A EP4640407A1 (en) 2022-12-21 2023-12-21 Preform, injection molding mold, temperature controlling mold, resin container manufacturing method, and resin container manufacturing device
KR1020257023837A KR20250124861A (ko) 2022-12-21 2023-12-21 프리폼, 사출 성형 금형, 온도 조절 금형, 수지제 용기의 제조 방법, 및 수지제 용기의 제조 장치

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JP2022-204380 2022-12-21
JP2022204380 2022-12-21

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JPH0434925B2 (https=) 1985-07-31 1992-06-09 Toyo Seikan Kaisha Ltd
JPH05330535A (ja) * 1992-05-27 1993-12-14 Nissei Asb Mach Co Ltd 再充填可能な合成樹脂製容器及びその成形方法
JP2001018284A (ja) * 1999-07-06 2001-01-23 Suzuka Fuji Xerox Co Ltd シームレスベルト及びその製造方法
US20040166264A1 (en) * 2003-02-26 2004-08-26 Nahill Thomas E. Preform assembly, container assembly and method of manufacture
US20050127024A1 (en) * 2003-12-12 2005-06-16 Darr Richard C. Plastic container and preform
JP2014200976A (ja) * 2013-04-03 2014-10-27 大日本印刷株式会社 プリフォームおよびプラスチックボトル
WO2019022231A1 (ja) * 2017-07-27 2019-01-31 日精エー・エス・ビー機械株式会社 中空物品の成形方法及び成形装置並びに中空物品
WO2021221024A1 (ja) * 2020-04-27 2021-11-04 日精エー・エス・ビー機械株式会社 樹脂製広口容器の製造方法、製造装置および樹脂製広口容器
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JPH0434925B2 (https=) 1985-07-31 1992-06-09 Toyo Seikan Kaisha Ltd
JPS6250908U (https=) * 1985-09-19 1987-03-30
JPH05330535A (ja) * 1992-05-27 1993-12-14 Nissei Asb Mach Co Ltd 再充填可能な合成樹脂製容器及びその成形方法
JP2001018284A (ja) * 1999-07-06 2001-01-23 Suzuka Fuji Xerox Co Ltd シームレスベルト及びその製造方法
US20040166264A1 (en) * 2003-02-26 2004-08-26 Nahill Thomas E. Preform assembly, container assembly and method of manufacture
US20050127024A1 (en) * 2003-12-12 2005-06-16 Darr Richard C. Plastic container and preform
JP2014200976A (ja) * 2013-04-03 2014-10-27 大日本印刷株式会社 プリフォームおよびプラスチックボトル
WO2019022231A1 (ja) * 2017-07-27 2019-01-31 日精エー・エス・ビー機械株式会社 中空物品の成形方法及び成形装置並びに中空物品
WO2021221024A1 (ja) * 2020-04-27 2021-11-04 日精エー・エス・ビー機械株式会社 樹脂製広口容器の製造方法、製造装置および樹脂製広口容器
JP2022187277A (ja) * 2021-06-07 2022-12-19 東洋製罐株式会社 プリフォーム、及び合成樹脂製容器の製造方法

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See also references of EP4640407A1

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EP4640407A1 (en) 2025-10-29
KR20250124861A (ko) 2025-08-20
CN120530008A (zh) 2025-08-22
JPWO2024135785A1 (https=) 2024-06-27

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