JPS57129723A - Manufacture of biaxially stretched tubular film - Google Patents

Manufacture of biaxially stretched tubular film

Info

Publication number
JPS57129723A
JPS57129723A JP1492381A JP1492381A JPS57129723A JP S57129723 A JPS57129723 A JP S57129723A JP 1492381 A JP1492381 A JP 1492381A JP 1492381 A JP1492381 A JP 1492381A JP S57129723 A JPS57129723 A JP S57129723A
Authority
JP
Japan
Prior art keywords
tubular film
load
biaxially stretched
stretching
elongation
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
JP1492381A
Other languages
Japanese (ja)
Inventor
Yoshiji Ichihara
Katsumi Okuyama
Hiroyasu Mizutani
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.)
Mitsubishi Petrochemical Co Ltd
Original Assignee
Mitsubishi Petrochemical 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 Mitsubishi Petrochemical Co Ltd filed Critical Mitsubishi Petrochemical Co Ltd
Priority to JP1492381A priority Critical patent/JPS57129723A/en
Publication of JPS57129723A publication Critical patent/JPS57129723A/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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B29C55/285—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation by using internal mechanical means

Landscapes

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

Abstract

PURPOSE:To manufacture a biaxially stretched film continuously and stably by stretching an unstretched tubular film made of a thermoplastic resin and having a specific yield point strength ratio in the longitudinal direction, obtained a load- elongation curve, by a mandrel stretching method. CONSTITUTION:An unstretched tubular film, having a yield point strength ratio XM in the longitudinal direction of 1<=XM<=1.25, obtained from the load-elongation curves in the longitudinal direction, measured at stretching temperature, and showing a load-elongation curve in which load is increased as elongation is increased below the yield point of the curve, is biaxially stretched by along the stretching mandrel of a conical base inserted into the unstretched tubular film while keeping its tubular form by a mandrel stretching method.
JP1492381A 1981-02-05 1981-02-05 Manufacture of biaxially stretched tubular film Pending JPS57129723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1492381A JPS57129723A (en) 1981-02-05 1981-02-05 Manufacture of biaxially stretched tubular film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1492381A JPS57129723A (en) 1981-02-05 1981-02-05 Manufacture of biaxially stretched tubular film

Publications (1)

Publication Number Publication Date
JPS57129723A true JPS57129723A (en) 1982-08-11

Family

ID=11874470

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1492381A Pending JPS57129723A (en) 1981-02-05 1981-02-05 Manufacture of biaxially stretched tubular film

Country Status (1)

Country Link
JP (1) JPS57129723A (en)

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