JPS56151532A - Manufacture of tubular film - Google Patents

Manufacture of tubular film

Info

Publication number
JPS56151532A
JPS56151532A JP5643680A JP5643680A JPS56151532A JP S56151532 A JPS56151532 A JP S56151532A JP 5643680 A JP5643680 A JP 5643680A JP 5643680 A JP5643680 A JP 5643680A JP S56151532 A JPS56151532 A JP S56151532A
Authority
JP
Japan
Prior art keywords
air
baloon
tubular film
annular die
mandrel
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
JP5643680A
Other languages
Japanese (ja)
Inventor
Hisashi Shimizu
Akira Mita
Tetsuya Shiomi
Toshiyuki Hirai
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.)
Gunze Ltd
Original Assignee
Gunze 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 Gunze Ltd filed Critical Gunze Ltd
Priority to JP5643680A priority Critical patent/JPS56151532A/en
Publication of JPS56151532A publication Critical patent/JPS56151532A/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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To remove oligomer and prevent the generation of troubles for a film making by a method wherein air is supplied into the tubular film molten and extruded from an annular die while the contaminated air is discharged therefrom. CONSTITUTION:While the tubular film 6 molten and extruded from the annular die 7 is cooled by an inside mandrel 8, a constant volume of air is poured into the tubular film to form a baloon 9. In this case, fresh air is supplied into the baloon 9 while the contaminated air is discharged therefrom, further, the supplying as well as the discharging amount of the air are controlled at a constant value so as not to generate the variation of the amount of air in the baloon. For this purpose, an air reserving ring 10, for examplem, having the same diameter as that of the inside mandrel 8 is provided above the mandrel 8 and a fine perforated member 11 is utilized for the outer wall thereof to permit the communication of the air while a discharging port 13 is provided on the annular die 7 in the baloon 9.
JP5643680A 1980-04-28 1980-04-28 Manufacture of tubular film Pending JPS56151532A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5643680A JPS56151532A (en) 1980-04-28 1980-04-28 Manufacture of tubular film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5643680A JPS56151532A (en) 1980-04-28 1980-04-28 Manufacture of tubular film

Publications (1)

Publication Number Publication Date
JPS56151532A true JPS56151532A (en) 1981-11-24

Family

ID=13027026

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5643680A Pending JPS56151532A (en) 1980-04-28 1980-04-28 Manufacture of tubular film

Country Status (1)

Country Link
JP (1) JPS56151532A (en)

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