JPS55105538A - Hollow molding of plastic curved pipe - Google Patents

Hollow molding of plastic curved pipe

Info

Publication number
JPS55105538A
JPS55105538A JP1323479A JP1323479A JPS55105538A JP S55105538 A JPS55105538 A JP S55105538A JP 1323479 A JP1323479 A JP 1323479A JP 1323479 A JP1323479 A JP 1323479A JP S55105538 A JPS55105538 A JP S55105538A
Authority
JP
Japan
Prior art keywords
air
parison
cavity
injected
bend
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.)
Pending
Application number
JP1323479A
Other languages
Japanese (ja)
Inventor
Tetsuo Ishikawa
Shoji Motojima
Tsuguo Kobayashi
Toshiharu Sakuma
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1323479A priority Critical patent/JPS55105538A/en
Publication of JPS55105538A publication Critical patent/JPS55105538A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/48185—Moulds with more than one separate mould cavity
    • B29C49/4819—Moulds with more than one separate mould cavity having different sizes or shapes of the 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
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
    • B29C2049/4805—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by closing the mould halves
    • 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
    • B29C49/04—Extrusion 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/4244—Means for deforming the parison prior to the blowing operation during or after laying preform into the final mould
    • B29C49/42454—The mould opening plane being vertical
    • 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
    • B29L2031/24—Pipe joints or couplings
    • B29L2031/243—Elbows

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

PURPOSE:To improve finished appearance of bent portion of pipe by injecting air against the cavity wall surface from air jets provided at the inside corner (protuberant portions) of the bend close to the cavity at the time of clamping of the lowered- down parison. CONSTITUTION:Heated and compressed air is injected from the air jets 8 provided in the protuberant portions 9 when a parison 3 extruded to a predetermined length is clamped by the dies 4, 4'. The air is injected to the curved part of the cavity 7 as shown by arrows to form an air gap layer so that the parison 3 won't directly contact the cavity 7. By this means, the bend of the parison 3 is floated up by the injected air during clamping to prevent direct contact with the curved part of the die 4, thus inhibiting the bend from being solidified preceedingly by cooling. This can prevent generation of wrinkle, etc., at the bent portion.
JP1323479A 1979-02-09 1979-02-09 Hollow molding of plastic curved pipe Pending JPS55105538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1323479A JPS55105538A (en) 1979-02-09 1979-02-09 Hollow molding of plastic curved pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1323479A JPS55105538A (en) 1979-02-09 1979-02-09 Hollow molding of plastic curved pipe

Publications (1)

Publication Number Publication Date
JPS55105538A true JPS55105538A (en) 1980-08-13

Family

ID=11827490

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1323479A Pending JPS55105538A (en) 1979-02-09 1979-02-09 Hollow molding of plastic curved pipe

Country Status (1)

Country Link
JP (1) JPS55105538A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57193324A (en) * 1981-05-25 1982-11-27 Shin Kobe Electric Mach Co Ltd Manufacture of l-shaped tube with thermoplastic resin bellows
EP0693358A1 (en) * 1994-07-18 1996-01-24 Salflex Polymers Ltd. A process for making a blow molded product
JPH08298840A (en) * 1996-06-03 1996-11-19 Iseki & Co Ltd Control device for combine harvester

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57193324A (en) * 1981-05-25 1982-11-27 Shin Kobe Electric Mach Co Ltd Manufacture of l-shaped tube with thermoplastic resin bellows
JPS6121126B2 (en) * 1981-05-25 1986-05-26 Shin Kobe Electric Machinery
EP0693358A1 (en) * 1994-07-18 1996-01-24 Salflex Polymers Ltd. A process for making a blow molded product
JPH08298840A (en) * 1996-06-03 1996-11-19 Iseki & Co Ltd Control device for combine harvester

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