JPS57212030A - Production of hollow molded article made of crystalline resin - Google Patents

Production of hollow molded article made of crystalline resin

Info

Publication number
JPS57212030A
JPS57212030A JP9743381A JP9743381A JPS57212030A JP S57212030 A JPS57212030 A JP S57212030A JP 9743381 A JP9743381 A JP 9743381A JP 9743381 A JP9743381 A JP 9743381A JP S57212030 A JPS57212030 A JP S57212030A
Authority
JP
Japan
Prior art keywords
molded article
resin
crystalline resin
molds
crystallization point
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
JP9743381A
Other languages
Japanese (ja)
Inventor
Shozo Hayashi
Hiroshi Maehara
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.)
Asahi Kasei Corp
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Chemical Industry Co Ltd
Asahi Kasei Kogyo KK
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 Asahi Chemical Industry Co Ltd, Asahi Kasei Kogyo KK filed Critical Asahi Chemical Industry Co Ltd
Priority to JP9743381A priority Critical patent/JPS57212030A/en
Publication of JPS57212030A publication Critical patent/JPS57212030A/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
    • B29C49/4823—Moulds with incorporated heating or cooling 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
    • B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0022—Bright, glossy or shiny surface

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (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 obtain a hollow molded article of a crystalline resin excellent in surface appearance, by a method wherein a molten parison consisting of a crystalline resin is clamped between molds heated to a temperature of hot lower than the crystallization point of the resin, and after blow molding, the mold temperature is lowered to the crystallization point or below. CONSTITUTION:Molds are provided with a heater using steam or the like and a cooler using water or the like, and the molten parison of a crystalline resin such as polypropylene is clamped between the molds heated to a temperature of higher than the crystallization point of the resin by about 5-20 deg.C, followed by blow molding to bring the parison into sufficiently close contact with the inside surface of the molds. Then, the mold temperature is lowered to or below the crystallization point of the resin to obtain the objective hollow molded article. The molded article thus obtained has a surface free from such defects as melt fractures, die lines and ribbing patterns, so that a molded article having beautiful appearance and high commercial value can be obtained.
JP9743381A 1981-06-25 1981-06-25 Production of hollow molded article made of crystalline resin Pending JPS57212030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9743381A JPS57212030A (en) 1981-06-25 1981-06-25 Production of hollow molded article made of crystalline resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9743381A JPS57212030A (en) 1981-06-25 1981-06-25 Production of hollow molded article made of crystalline resin

Publications (1)

Publication Number Publication Date
JPS57212030A true JPS57212030A (en) 1982-12-27

Family

ID=14192241

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9743381A Pending JPS57212030A (en) 1981-06-25 1981-06-25 Production of hollow molded article made of crystalline resin

Country Status (1)

Country Link
JP (1) JPS57212030A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6087035A (en) * 1983-10-19 1985-05-16 Kojima Press Co Ltd Cooling method of molded item in blow molding
JPH11151748A (en) * 1997-11-20 1999-06-08 Jsr Corp Multilayered blow molded product
EP0956939A1 (en) * 1998-05-15 1999-11-17 Elenac GmbH Large polyethylene containers
JP2013248798A (en) * 2012-05-31 2013-12-12 Yoshino Kogyosho Co Ltd High density polyethylene resin container and method for molding the same
JP2013248797A (en) * 2012-05-31 2013-12-12 Yoshino Kogyosho Co Ltd High density polyethylene resin container and method of molding the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6087035A (en) * 1983-10-19 1985-05-16 Kojima Press Co Ltd Cooling method of molded item in blow molding
JPH11151748A (en) * 1997-11-20 1999-06-08 Jsr Corp Multilayered blow molded product
EP0956939A1 (en) * 1998-05-15 1999-11-17 Elenac GmbH Large polyethylene containers
JP2013248798A (en) * 2012-05-31 2013-12-12 Yoshino Kogyosho Co Ltd High density polyethylene resin container and method for molding the same
JP2013248797A (en) * 2012-05-31 2013-12-12 Yoshino Kogyosho Co Ltd High density polyethylene resin container and method of molding the same

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