WO2020158919A1 - プリフォームの温度調整装置及び温度調整方法、及び樹脂成形容器の製造装置及び製造方法 - Google Patents

プリフォームの温度調整装置及び温度調整方法、及び樹脂成形容器の製造装置及び製造方法 Download PDF

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Publication number
WO2020158919A1
WO2020158919A1 PCT/JP2020/003649 JP2020003649W WO2020158919A1 WO 2020158919 A1 WO2020158919 A1 WO 2020158919A1 JP 2020003649 W JP2020003649 W JP 2020003649W WO 2020158919 A1 WO2020158919 A1 WO 2020158919A1
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WO
WIPO (PCT)
Prior art keywords
preform
temperature
hollow rod
air
flow passage
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/JP2020/003649
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English (en)
French (fr)
Japanese (ja)
Inventor
学 荻原
淳 長崎
堀内　一宏
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 CN202410291027.4A priority Critical patent/CN118082156A/zh
Priority to CN202080023149.5A priority patent/CN113631347B/zh
Priority to US17/427,553 priority patent/US12017399B2/en
Priority to KR1020217025246A priority patent/KR20210111848A/ko
Priority to JP2020542465A priority patent/JP6802948B1/ja
Priority to EP20748579.8A priority patent/EP3919255A4/en
Priority to KR1020247005750A priority patent/KR20240028554A/ko
Publication of WO2020158919A1 publication Critical patent/WO2020158919A1/ja
Anticipated expiration legal-status Critical
Priority to US18/673,703 priority patent/US20240308127A1/en
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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6427—Cooling 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
    • B29C49/02—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
    • 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
    • B29C45/7207—Heating or cooling of the moulded articles
    • 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
    • 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
    • B29C49/6427—Cooling of preforms
    • B29C49/643—Cooling 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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6458—Thermal conditioning of preforms characterised by temperature differential tangentially, i.e. along circumference
    • 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
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling 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
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6465—Cooling
    • 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
    • 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
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/078—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the bottom
    • 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
    • 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
    • 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
    • B29L2031/7158—Bottles

Definitions

  • the present invention relates to a preform temperature adjusting device, a temperature adjusting method and the like in a hot parison blow molding device. Specifically, the present invention relates to a preform temperature adjusting device, a temperature adjusting method, and the like that can perform an appropriate temperature adjusting process in a short time even on a preform that is released in a high temperature state with a short injection molding time.
  • an injection molding unit for injection molding a preform a temperature adjusting unit for adjusting the temperature of the preform molded by the injection molding unit, and a blow molding unit for blow molding the preform temperature-controlled by the temperature adjusting unit have been provided.
  • a blow molding device is known (for example, refer to Patent Document 1).
  • This type of blow molding apparatus is a conventional blow molding apparatus mainly including only an injection molding section and a blow molding section (for example, see Patent Document 2) with a temperature control section added.
  • the preform that has just been molded in the injection molding section does not have a temperature distribution suitable for blow molding, so a temperature adjustment unit that can positively adjust the temperature of the preform between the injection molding section and the blow molding section.
  • the temperature adjusting unit uses a heating pot type (heating block) or a heating rod, and is of a system that adjusts the temperature by heating the preform in a non-contact manner.
  • thermoforming apparatus for producing a container has been proposed, which comprises a bottom portion having a desired thickness when performed and a barrel portion having a wall portion uniformly and thinly stretched (for example, Patent Document 1). 3).
  • a blow molding apparatus has also been proposed in which the preform is cooled not only in the injection molding section but also in the temperature control section to shorten the injection molding time (specifically, the cooling time) that determines the molding cycle time (for example, See Patent Document 4). Furthermore, in recent years, a hollow rod is inserted into a preform housed in a temperature control pod type, and cooling air is circulated in a gap between the outer periphery of the hollow rod and the inner periphery of the preform to cool the entire preform, A device that shortens the molding cycle time and makes the container transparent has been devised.
  • the present invention provides a temperature control device for a preform in a blow molding device which can realize shortening of molding cycle time and can eliminate uneven thickness while achieving transparency of a container, and a rectifying member used for the same.
  • the purpose is to provide.
  • the temperature control device for a preform of the present invention adjusts the temperature of an injection-molded bottomed preform (1), so that the preform (1) held by a holding member (50) has a hollow rod.
  • a member (19) is fitted and attached to the outer circumference of the hollow rod member (18), whereby the cross-sectional area of the first air flow passage (21a) is at least partially adjusted. ..
  • the injection-molded bottomed preform (1) is held by the holding member (50), and the temperature is adjusted in the temperature adjusting unit (20).
  • the hollow rod member (18) to which a flow path adjusting member (19) is attached is inserted into the preform (1), thereby the preform (1) and the flow path adjusting member ( 19), a step of forming a first air flow passage (21a) between the hollow rod member (18), the flow path adjusting member (19) and the preform (1) is provided in a temperature control pot type (17). Circulating the cooling air through the first air flow passage (21a) after being inserted into the cavity (17a).
  • the apparatus for producing a resin-molded container according to the present invention includes an injection molding part (10) for injection-molding a bottomed preform (1), and the preform (1) molded by the injection molding part (10).
  • An apparatus for manufacturing a resin-molded container comprising: a temperature adjusting unit (20) for adjusting the temperature of the resin and a blow molding unit (30) for blow molding the preform (1) whose temperature is adjusted by the temperature adjusting unit (20) ( 100), and by inserting the hollow rod member (18) into the preform (1) held by the holding member (50), the preform (1) and the hollow rod member (18) are separated from each other.
  • the flow path adjusting member (19) is fitted and attached to the outer periphery of the hollow rod member (18), whereby The area of the first air flow passage (21a) is at least partially adjusted.
  • the method for producing a resin-molded container of the present invention after the injection-molded bottomed preform (1) is held by the holding member (50) and the temperature is adjusted in the temperature adjusting section (20).
  • a hollow rod member (18) having a flow path adjusting member (19) attached is inserted into the preform (1) when the temperature is adjusted by the temperature adjusting unit (20).
  • the preform (1) are inserted into the cavity of the temperature control pot mold (17), and then the cooling air is circulated through the first air flow passageway (21a).
  • FIGS. 6(A) and 6(B) are respectively a front view of the first embodiment of the flow straightening rod used in the temperature adjusting section and a cross-sectional view taken along line VIB-VIB in FIG. 6(A).
  • FIG. 7A and 7B are a partial cross-sectional front view of the second embodiment of the flow straightening rod and a cross-sectional view taken along line VIIB-VIIB in FIG. 7A, respectively.
  • 8A and 8B are a partial cross-sectional front view of the third embodiment of the flow straightening rod and a cross-sectional view taken along line VIIIB-VIIIB in FIG. 8A, respectively.
  • 9(A) and 9(B) respectively show a front sectional view of the fourth embodiment of the flow straightening rod and a sectional view taken along line IXB-IXB in FIG. 9(A).
  • FIG. 10 shows a cross-sectional view corresponding to FIG. 4 when the rectifying rod shown in FIG. 9 is used in a temperature adjusting unit.
  • 11A to 11C are respectively a front sectional view of the fifth embodiment of the flow straightening rod and sectional views taken along line XIB-XIB and line XIC-XIC in FIG. 11A.
  • 12A to 12C are front sectional views of the sixth embodiment of the flow regulating rod, respectively, a sectional view taken along line XIIA-XIIA in FIG. 12B, the front sectional view, and FIG. A sectional view taken along the line XIIC-XIIC in (B) is shown.
  • 13A and 13B are front sectional views of an example of a hollow rod to which the rectifying rod shown in FIG. 12 is applied, respectively, and a sectional view taken along line XIIIA-XIIIA in FIG.
  • FIG. 16 is a cross-sectional view corresponding to FIG. 4 when the rectifying rod and the hollow rod shown in FIGS. 12, 13 and 15 are used in a temperature adjusting unit.
  • FIGS. 15A to 15C are front sectional views of the seventh embodiment of the flow straightening rod, respectively, which are sectional views taken along line XVA-XVA in FIG. 15B, the front sectional view, and FIG. (B) shows a sectional view taken along line XVIC-XVIC in the middle.
  • 16(A) and 16(B) are front sectional views of another example of the hollow rod to which the rectifying rod shown in FIG. 15 is applied.
  • FIG. 15 is a cross-sectional view corresponding to FIG. 4 when the rectifying rod and the hollow rod shown in FIGS. 12, 13 and 15 are used in a temperature adjusting unit.
  • FIGS. 15A to 15C are front sectional views of the seventh embodiment of the flow straightening rod, respectively, which are sectional views taken along line XVA-XVA
  • FIG. 16(B) is a sectional view taken along line XVIA-XVIA in FIG. 16(B).
  • FIG. 3 is a front cross-sectional view of FIG. 17(A) to 17(C) respectively show a perspective view, a front view and a plan view of a completed container taken out after blow molding the preform.
  • FIG. 7 is a cross-sectional view of the rectifying rod shown in FIG. 6.
  • FIGS. 19A and 19B are diagrams showing first and second experimental data showing the uneven thickness state of the completed container, respectively.
  • FIG. 1 is a perspective view of a blow molding apparatus which is an example of a resin molding container manufacturing apparatus to which a temperature control device for a preform according to an embodiment of the present invention is applied
  • FIG. FIG. 3 shows a perspective view of the molded preform
  • FIG. 3 shows a cross-sectional view of the temperature adjusting section as seen from the front
  • FIG. 4 shows an enlarged cross-sectional view of the main part of FIG.
  • the blow molding apparatus 100 includes an injection molding unit 10, a temperature adjusting unit 20, a blow molding unit 30, and a take-out unit 40, and the preform 1 is injection molded by the injection molding unit 10. After that, the blow molding unit 30 finally blow-molds the container 101 (see FIGS. 1 and 14).
  • the injection molding unit 10, the temperature adjusting unit 20, the blow molding unit 30, and the take-out unit 40 are arranged in an array that forms four sides of a square when viewed from above.
  • a turntable (not shown) provided with a neck mold 50 (see FIG. 3) for holding the neck portion 3 (see FIG. 2) of the preform 1 molded by the injection molding portion 10 is provided.
  • This turntable has four sets of neck molds 50 arranged in an array so as to form four sides of a square when viewed from above. As a result, the turntable rotates 90 degrees counterclockwise about the vertical axis on the injection molding unit 10, the temperature adjusting unit 20, the blow molding unit 30, and the take-out unit 40, and is held by the neck mold 50. Each process is performed on the preform 1.
  • the injection molding unit 10 includes an injection core mold 11, an injection cavity mold 12, and an injection device (not shown), and is provided to injection-mold the preform 1.
  • a cooling circuit (not shown) is provided in each of the injection core mold 11 and the injection cavity mold 12, and a cooling medium of about 5 to 20° C. is flown therein.
  • the preform 1 is made of a thermoplastic synthetic resin, and has a neck portion 3 on the open side and a storage portion (main body portion) 2 on the closed side and has a bottomed shape (bottomed hollow shape). Is formed in.
  • the reservoir 2 is composed of a body 2a connected to the neck 3 on the open side and a bottom 2b located on the closed side and connected to the body 2a.
  • the preform 1 becomes a finished container 102 (see FIGS. 1 and 14) such as a PET bottle by being blow-molded, and the thickness of the pre-formed container 1 is shortened in the vertical and horizontal directions in FIG. It has a meat-like shape.
  • the injection molding unit 10 heats and melts a thermoplastic synthetic resin material (for example, a polyester resin such as PET (polyethylene terephthalate)) at a high temperature, and the melted material is injected into an injection core mold 11 and an injection cavity by an injection device (not shown).
  • a thermoplastic synthetic resin material for example, a polyester resin such as PET (polyethylene terephthalate)
  • PET polyethylene terephthalate
  • the material is injected (filled) between the molding space (cavity) defined by the mold 12 and the neck mold 50, and the material of the injected material close to the cavity surface has a melting point (for example, about 255° C. in the case of PET).
  • a surface layer (appropriately referred to as an outer layer, an outer layer, or a skin layer) is formed in the storage portion 2, and the preform 1 is molded. ..
  • the inner layer (appropriately referred to as an inner layer or core layer) of the storage part 2 of the preform 1 is kept at a temperature equal to or lower than the melting point of the molding material-above the glass transition temperature (for example, 150 to 200° C.), 2 is adjusted so as to have a heat amount (held heat) that can be stretched by the blow molding unit 30.
  • the molding cycle time that is, the molding time of the preform 1 is shortened as compared with the conventional case.
  • the cooling time is set to be significantly shorter than that of the conventional method.
  • the cooling time is set to 2/3 or less of the injection time, preferably 1/2 or less, and more preferably 1/3 or less.
  • the preform 1 which has been solidified to some extent after being injection-molded by the injection-molding unit 10 is lifted upward together with the turntable while being held by the neck mold 50 and pulled out (released from the injection cavity mold 12 and the injection core mold 11). ), as shown in FIG. 1, the turntable rotates 90 degrees counterclockwise to be conveyed to the temperature adjusting unit 20.
  • the temperature adjusting unit 20 is arranged next to the injection molding unit 10, and includes an upper tubular air nozzle 16 and a lower temperature adjusting pot mold 17 as shown in FIGS. 3 and 4.
  • the lower end of the air nozzle 16 is in airtight contact with the neck portion 3 of the preform 1.
  • the temperature control pot mold 17 is composed of a plurality of step portions (temperature control blocks) in the vertical direction so that the temperature can be adjusted in the vertical direction of the preform 1.
  • a temperature control medium (cooling medium) having a different temperature for example, a predetermined temperature in the range of 10° C. to 90° C.
  • the internal configuration of the tubular air nozzle 16 will be described below.
  • Reference numeral 18 denotes a hollow rod that is inserted into the preform 1.
  • a sleeve (hollow piece) 18a is fitted and fixed to the lower end of the hollow rod and is concentric with the cylindrical air nozzle 16. Moreover, they are fixedly arranged at the upper fixing portion 18b.
  • the hollow rod 18 has a cooling air outlet hole 18c at the upper end, a lower circumferential groove 18d, and an internal air flow passage 21b.
  • the sleeve 18a is provided when the length of the preform 1 in the axial direction is large, and is not necessarily provided when the length of the preform 1 is short.
  • Reference numeral 19A denotes a first embodiment of a tubular flow path adjusting rod (hereinafter, appropriately referred to as a rectifying rod), and as shown in FIGS. 4 and 6, the outer circumference 19a has a perfect circular cross section (see FIG. 6B). In addition, it has a truncated cone shape whose outer diameter gradually decreases from the upper part to the lower part, and facilitates the circulation of cooling air to be described later on the engaged part (screw hole) 19b provided at the upper end and the outer periphery of the lower end 19c. And a comparatively large curved surface.
  • the inclination angle of the truncated cone is determined according to the inclination angle of the inner circumference of the preform 1, and in this case, it is 0.34 degrees with respect to the axis.
  • the rectifying rod 19A is commonly fitted and attached to the lower end of the hollow rod 18 and the outer circumference of the sleeve 18a, and the engaging member (screw) 24 (FIG. 4) is attached to the upper end of the rectifying rod 19A. (See) is engaged with the circumferential groove 18d through the engaged portion (screw hole) 19b to firmly fix the peripheral groove 18d. Therefore, the rectifying rod 19A can be easily attached to and detached from the hollow rod 18 in a screwed manner, so that different types of rectifying rods can be easily and interchangeably attached to the same hollow rod 18. ..
  • the air nozzle 16, the hollow rod 18, and the rectifying rod 19A have an integrated structure (hereinafter, this integrated structure will be simply referred to as an air introducing/extracting member), and are integrally moved up and down by a driving device (not shown).
  • the preform 1 supported by the neck mold 50 is inserted into the pot cavity 17a (see FIG. 4) of the temperature control pot mold 17 and the air introducing member is lowered to abut on the neck portion 3.
  • the cooling air (compressed air) flowing in from the cooling air inlet 16a has a ring-shaped cross section between the inner circumference of the air nozzle 16 and the outer circumference of the rectifying rod 19A and the inner circumference of the preform 1.
  • the first air flow passage 21a is formed, and the cooled air that has moved radially inward at the lower end of the flow straightening rod 19A sequentially guides the inside of the sleeve 18a and the hollow rod 18 upward from the lower end opening of the sleeve 18a.
  • Two air flow passages 21b are formed. After cooling, the air is discharged to the outside from the air outlet 16b through the upper cooling air outlet hole 18c (see FIG. 3). In some cases, air may flow in through the second air flow passage 21b and flow out through the first air flow passage 21a.
  • the space formed in the first air flow passage 21a particularly between the rectifying rod 19A and the inner circumference of the preform 1 is called a ring-shaped void 22 (see FIG. 4).
  • the radial dimension of the ring-shaped void 22 is smaller than the radial dimension formed between the upstream hollow rod 18 and the air nozzle 16, and is, for example, 0.5 to 1.5 mm, preferably 0.5 to 1.0 mm. Set to range. Therefore, the air flow passing through the ring-shaped void 22 is throttled and flows at a higher speed than the upstream side. That is, by using the flow path adjusting rod, the cooling air can be speeded up and rectified in the ring-shaped void 22 more than in the upstream region thereof.
  • the preform temperature adjusting apparatus of the present invention will be described.
  • the preform 1 supported by the neck mold 50 is conveyed from the injection molding section 10 and inserted into the cavity 17 a of the temperature control pot mold 17.
  • the air introducing member is lowered, and the hollow rod 18 and the rectifying rod 19 are inserted into the preform 1.
  • the neck die 50 is centered with respect to the centering ring 60 mounted on the temperature control pot die 17.
  • the first air flow passage 21a (ring-shaped void 22) into which the cooling air flows and the second air flow passage 21b through which the air after cooling the preform 1 flows are formed.
  • cooling air at room temperature passes from the air inlet 16a to the first air flow passage 21a, that is, the ring-shaped void 22 at a relatively high speed.
  • room temperature e.g. 10° C. to 20° C.
  • the temperature of the preform 1 is lowered to an appropriate temperature suitable for the next blowing step.
  • compressed air may be separately introduced into the preform 1 to bring the preform 1 into close contact with the cavity 17a of the temperature control pot mold 17 before the cooling air is circulated in the preform 1 to be cooled.
  • the preform 1 can be cooled from the inner side and the temperature can be controlled reliably from the outer side, and in addition to the cooling effect, the removal of uneven temperature and the efficiency of temperature equalization can be improved.
  • the cooled air smoothly changes its flow direction inward in the radial direction at the lower end of the first air flow passage 21a, that is, at the lower end 19c of the rectifying rod, and then flows through the second air flow passage 21b inside the sleeve 18a. Through the air outlet 16b to the outside.
  • the radial dimension of the ring-shaped void 22 of the present invention is the same as that of the former flow straightening rod.
  • the rectifying rod 19A is not provided, the rectifying rod 19A is provided, and the size is finely adjusted. Therefore, the flow velocity of the cooling air passing through the first air flow passage 21a is correspondingly increased, and the cooling efficiency of the preform is improved.
  • FIG. 7 shows a rectifying rod 19B that is a second embodiment of the rectifying rod.
  • the rectifying rod 19B has a cutout portion 19d extending in the axial direction at least at one position on the outer circumference in the circumferential direction.
  • the thickness of the container 101 at the portion corresponding to the cutout portion 19d of the preform storage portion 2 is It was observed that the thickness of the non-corresponding part tended to be larger than that. This will be described later in detail.
  • FIG. 8 shows a rectifying rod 19C which is a third embodiment of the rectifying rod.
  • the rectifying rod 19C has notches 19d1 and 19d2 extending in the axial direction at two circumferential positions facing each other in the diametrical direction on the outer circumference. Therefore, the wall thickness of the two containers 101 corresponding to the above two notches 19d1 and 12d2d of the preform storage part 2 became larger than the wall thickness of the non-corresponding part.
  • the cutout portions 19d may be provided at three or more locations in the circumferential direction on the outer circumference.
  • FIG. 9 shows a rectifying rod 19D that is the fourth embodiment of the rectifying rod.
  • the rectifying rod 19D has a large diameter portion 19e at the upper end, a small diameter portion 19f at the axially lower portion, and a substantially tapered portion 19g connecting these portions.
  • FIG. 10 shows a state in which the rectifying rod 19D is attached to the hollow rod 18 and the sleeve 18a and is further inserted into the cavity 17a of the temperature control pod mold 17 together with the preform 1B different from the preform 1A held by the neck mold 50. 4, those parts which are the same as those corresponding parts in FIG. 4 are designated by the same reference numerals, and a description thereof will be omitted.
  • the second preform 1B has a substantially tapered inner diameter portion 1c that connects the large inner diameter portion 1a at the neck portion 3A and the lower small inner diameter portion 1b.
  • the large-diameter portion 19e, the tapered portion 19g, and the small-diameter portion 19f of the rectifying rod 19D are brought into contact with each other with a substantially uniform void size following the shapes of the three inner diameter portions 1a, 1c, and 1b of the preform 1B.
  • the first air flow passage 21a having a uniform cross-sectional area can be provided along the flow of the cooling air, and a uniform cooling effect can be given along the axial direction of the preform 1B.
  • FIG. 11 shows a rectifying rod 19E that is the fifth embodiment of the rectifying rod.
  • This rectifying rod 19E has the same shape as the rectifying rod 19D of FIG. 9, but further has a cutout portion 19h extending in the axial direction at one location on the outer circumference in the circumferential direction.
  • the cutout portions 19h may be provided at two or more locations in the circumferential direction on the outer circumference.
  • the same effect as the cutout portions 19d (19d1 and 19d2) of the third and fourth embodiments (FIGS. 7 and 8) is obtained.
  • the cross-sectional shape of the rectifying rod 19 is basically circular, but is not limited to this, and may be an ellipse or a polygon, and one or more of these ellipses or polygons. You may provide the notch part.
  • the cutout portions 19d and 19h are linear, but the shape is not limited to this, and may take various shapes such as a curved shape or an uneven shape.
  • the rectifying rod 19F has a polygonal (eg, regular octagonal) engagement recess 19i at the upper end.
  • the polygonal engagement recess 19i includes a plurality of (eight) substantially rectangular inner surface portions.
  • FIG. 13 shows a hollow rod 18X for mounting the rectifying rod 19F.
  • the sleeve 18a which is a separate member, is attached to the lower end of the hollow rod 18, but this hollow rod 18X is integrally provided with the sleeve portion 18e at the lower end and has an intermediate height.
  • An engaging projection 18f formed of a polygonal prism is formed at the position.
  • the prismatic portion includes a plurality (eight) of substantially rectangular outer surface portions. Therefore, as shown in FIG.
  • the straightening rod 19F is fitted into the sleeve portion 18e of the hollow rod 18X from the lower side in the figure (the side in the direction in which the opening end through which compressed air flows in and out), and its polygonal shape.
  • the engaging concave portion 19i is engaged with the polygonal engaging convex portion 18f of the hollow rod 18X by determining the direction based on the polygonal engaging. More specifically, a plurality of inner surface portions of the engaging concave portions 19i and a plurality of outer surface portions of the prismatic portions of the polygonal engaging convex portions 18f contact each other, and the rectifying rod 19F forms a predetermined angle in the circumferential direction with respect to the hollow rod 18X.
  • the degree of cooling by the cooling air depends on the angular position in the circumferential direction due to the void size of the ring-shaped void 22 being slightly different depending on the angular position in the circumferential direction.
  • the distribution of the cooling degree can be adjusted by removing the rectifying rod 19F, rotating the rectifying rod 19F in units of a predetermined angle (for example, 45 degrees), and reattaching it to the hollow rod 18X. That is, the position of the cutout portion 19h of the straightening rod 19F can be changed so as to face the high temperature portion of the preform 1, and the degree of cooling (cooling strength) of the high temperature portion can be increased.
  • the polygonal engaging concave portions 19i and the polygonal engaging convex portions 18f may be polygons other than octagons as long as they are triangular or more.
  • FIGS. 15A to 15C show a rectifying rod 19G that is the seventh embodiment of the rectifying rod.
  • the straightening rod 19G is provided with a plurality of (e.g., eight) engaging recesses 19j at circumferentially equally spaced positions on the upper end.
  • Each engagement recess 19j is, for example, substantially rectangular or slit-shaped, and is formed so as to be recessed toward the outer diameter side on the inner peripheral surface of a substantially cylindrical recess formed at the upper end of the flow straightening rod 19G.
  • FIG. 16 shows a hollow rod 18Xa to which this rectifying rod 19G is attached.
  • This hollow rod 18Xa is also provided with a sleeve portion 18e integrally at the lower end, and is a single engaging projection composed of a single projecting portion (substantially rectangular flat plate-shaped projecting portion) projecting in the radial direction at an intermediate height position.
  • the portion 18h is formed. Therefore, the rectifying rod 19G is fitted into the sleeve portion 18e of the hollow rod 18Xa from the lower side in the figure (the side in the direction in which the opening end through which compressed air flows in and out), and one of the engaging concave portions 19j is hollow.
  • the rod 18Xa is oriented and engaged with the single engaging convex portion 18h.
  • the single engagement convex portion 18h is fitted into any of the plurality of engagement concave portions 19j, and the rectifying rod 19G is oriented in a predetermined angular position in the circumferential direction with respect to the hollow rod 18Xa.
  • Engaged (while positioned).
  • the lower end of the rectifying rod 19G is supported by a locking member (stop ring) 23 attached to the engaging recess 18g for the stop ring at the lower end of the sleeve portion 18e (see FIG. 14) and locked by the hollow rod 18Xa. ..
  • the degree of cooling by the cooling air is changed according to the angular position in the circumferential direction because the size of the ring-shaped void 22 is slightly different depending on the angular position in the circumferential direction.
  • the distribution of the cooling degree can be adjusted by removing the rectifying rod 19G and rotating the rectifying rod 19G so that the engaging recess 19j different from the former is engaged with and attached to the single engaging protrusion 18h of the hollow rod 18Xa. Is. That is, the cutout portion 19h of the straightening rod 19G can be repositioned so as to face the high temperature portion of the preform 1, and the degree of cooling (cooling strength) of the high temperature portion can be increased.
  • FIG. 14 is a schematic diagram of the temperature adjusting unit 20 when the hollow rod 18X and the rectifying rod 19F (the same applies to the hollow rod Xa and the rectifying rod 19G) are mounted, and the same portions as those in FIG. 4 will be described in detail. Is omitted. Note that, in FIG. 14, the cavity 17a (see FIG. 4) of the temperature control pot mold 17 is configured by a single surface having no boundary (slit or parting line) between the stepped portions.
  • the polygonal engaging concave portions 19i and the polygonal engaging convex portions 18f in FIGS. 12 and 13 are not limited to the polygonal shape, and have at least a portion corresponding to the apex of the polygonal shape and selectively engage with each other. It may be an engaging portion having various shapes to be obtained. Further, the plurality of engaging concave portions 19j in FIGS. 15 and 16 may be a plurality of engaging portions of various shapes, and the single engaging convex portion 18h selectively engages with the plurality of engaging portions. There may be one or more engaging protrusions. In some cases, the rectifying rod and the hollow rod may have the engaging protrusions and the engaging recesses arranged oppositely to each other as compared with the case of the above embodiment.
  • FIGS. 17 to 19 show a first experimental example.
  • FIG. 17 shows a finished container 101, such as a PET bottle, which is blow-molded in the blow-molding unit 30 and taken out after the temperature of the preform 1 is adjusted.
  • the body 102 of the container 101 has a regular octagonal cross section. In addition, it has eight side portions 102a.
  • FIG. 18 schematically shows a cross section of the rectifying rod 19B used in this experiment, and has one notch 19d in the direction of 90 degrees.
  • the radial distance from the center is the wall thickness (mm) of the body of the container 101, and the wall thickness t is 0.6 to 1. It can be seen that the fluctuation is within the range of 0.4 mm. In this case, the 90° direction in which the cutout portion 19d of the rectifying rod 19 of FIG. 15 is provided coincides with the 90° direction of FIG. 16.
  • the temperature of the preform 1 was adjusted using the straightening rod 19B provided with one notch portion 19d, and then the preform 1 was blow-molded by the blow molding unit 30 to form a container. 101 was obtained, and the thickness of the body 102 was measured at a position where the height from the bottom of the container 101 was 116 mm. First, looking at the measurement result of FIG.
  • FIG. 16(B) shows the same experiment as in FIG. 16(A) except that the wall thickness of the body 102 was measured at a height of 84 mm from the bottom of the container 102. The results obtained are shown.
  • the case where the cutout portion 19d is provided curve B
  • the case where the cutout portion 19d is not provided curve A
  • an aluminum tape is attached to the portion other than the cutout portion 19d to reduce the air flow passage area.
  • curve C the same tendency as in FIG. 16(A) was seen, but when aluminum tape was attached to other than the cutout portion 19d (curve C), the result of It can be seen that the wall thickness becomes larger than the case.
  • the reason for this result is considered as follows. That is, since the cross-sectional area of the portion corresponding to the cutout portion 19d of the first air flow passage 21a (ring-shaped void 22) is partially larger than the other portions, the flow passage resistance of the air at this portion decreases, It seems that more air will flow in than other parts, and the cooling efficiency (cooling strength) will be relatively high. On the other hand, the other portion of the first air flow passage 21a that does not correspond to the cutout portion 19d has a small flow passage cross-sectional area, so that the flow passage resistance is increased and the amount of air flowing in is reduced. It seems that the cooling efficiency becomes low.
  • the preform 1 is efficiently rapidly cooled to cause clouding (haze, crystallization).
  • the local (vertical stripe-like) high temperature part of the storage part 2 of the preform 1 can be selectively cooled to positively eliminate the temperature deviation.
  • the injection molding section 10 uses, for example, three out of six preforms.
  • the rectifying rod 19B having the cutout portion 19d in the third temperature control pod mold 17 in the next temperature control unit 20 causes The uneven thickness of 101 can be eliminated.
  • the supply amount of the circulating air was adjusted so that the container 102 was cooled to a temperature at which the same degree of good transparency could be obtained without causing whitening or clouding. ..
  • the circulating air supply amount (consumption amount) was reduced from 407 liters/minute in the case of (1) to 207 liters/minute in the case of (2).
  • the circulating air supply amount can be significantly reduced, the cooling efficiency of the preform 1 can be improved, and the load on the apparatus can be reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
PCT/JP2020/003649 2019-01-31 2020-01-31 プリフォームの温度調整装置及び温度調整方法、及び樹脂成形容器の製造装置及び製造方法 Ceased WO2020158919A1 (ja)

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Application Number Priority Date Filing Date Title
CN202410291027.4A CN118082156A (zh) 2019-01-31 2020-01-31 预制件的温度调节装置和温度调节方法以及树脂成型容器的制造装置和制造方法
CN202080023149.5A CN113631347B (zh) 2019-01-31 2020-01-31 预制件的温度调节装置和温度调节方法以及树脂成型容器的制造装置和制造方法
US17/427,553 US12017399B2 (en) 2019-01-31 2020-01-31 Temperature adjusting device, temperature adjusting method, and resin container manufacturing method
KR1020217025246A KR20210111848A (ko) 2019-01-31 2020-01-31 프리폼의 온도조정장치 및 온도조정방법 및 수지성형 용기의 제조장치 및 제조방법
JP2020542465A JP6802948B1 (ja) 2019-01-31 2020-01-31 プリフォームの温度調整装置及び温度調整方法、及び樹脂成形容器の製造装置及び製造方法
EP20748579.8A EP3919255A4 (en) 2019-01-31 2020-01-31 Temperature adjustment device and temperature adjustment method for preform and manufacturing device and manufacturing method for resin molding container
KR1020247005750A KR20240028554A (ko) 2019-01-31 2020-01-31 프리폼의 온도조정장치 및 온도조정방법 및 수지성형 용기의 제조장치 및 제조방법
US18/673,703 US20240308127A1 (en) 2019-01-31 2024-05-24 Temperature adjusting device, temperature adjusting method, and resin container manufacturing method

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JP2019-015104 2019-01-31
JP2019015104 2019-01-31

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US17/427,553 A-371-Of-International US12017399B2 (en) 2019-01-31 2020-01-31 Temperature adjusting device, temperature adjusting method, and resin container manufacturing method
US18/673,703 Continuation US20240308127A1 (en) 2019-01-31 2024-05-24 Temperature adjusting device, temperature adjusting method, and resin container manufacturing method

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CN118663871B (zh) * 2024-08-21 2024-10-25 山东瑞浩重型机械有限公司 一种具有温度监测的铸造件脱模装置及系统

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JP6802948B1 (ja) 2020-12-23
CN118082156A (zh) 2024-05-28
US12017399B2 (en) 2024-06-25
JPWO2020158919A1 (ja) 2021-02-18
US20240308127A1 (en) 2024-09-19
CN113631347B (zh) 2024-04-02
EP3919255A1 (en) 2021-12-08
JP2021041704A (ja) 2021-03-18
EP3919255A4 (en) 2022-10-12
JP7566596B2 (ja) 2024-10-15
CN113631347A (zh) 2021-11-09
US20220097287A1 (en) 2022-03-31
KR20210111848A (ko) 2021-09-13
KR20240028554A (ko) 2024-03-05

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