JPS57152922A - Method of heat treatment of biaxially oriented film - Google Patents

Method of heat treatment of biaxially oriented film

Info

Publication number
JPS57152922A
JPS57152922A JP3791681A JP3791681A JPS57152922A JP S57152922 A JPS57152922 A JP S57152922A JP 3791681 A JP3791681 A JP 3791681A JP 3791681 A JP3791681 A JP 3791681A JP S57152922 A JPS57152922 A JP S57152922A
Authority
JP
Japan
Prior art keywords
temperature
treatment
loosening
heat treatment
film
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
JP3791681A
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 JP3791681A priority Critical patent/JPS57152922A/en
Publication of JPS57152922A publication Critical patent/JPS57152922A/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
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets

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 obtain the titled film having a uniform thickness and with heat sealability and tear resistance, by biaxially orienting in a low rate a crystalline thermoplastic resin film, quenching it, and subjecting it to loosening heat treatment under specified conditions in longitudinal and transversal directions at a temperature not less than the natural heat shrinkage temperature. CONSTITUTION:A crystalline thermoplastic resin (for example: a high-density polyethylene, etc.) is oriented biaxially in a low rate in the order of 1.5-3.5, and is quenched to obtain a biaxially oriented film, which is subjected to loosening heat treatment at a temperature not less than the natural heat shrinkage temperature in a transversal direction and in a longitudinal direction (at the same time as the transversal direction treatment or after the transversal direction treatment) to obtain the intended film, the longitudinal direction treatment being at a loosening ratio lawer than that of the transversal direction treatment. It is preferred that the loosening heat treatment is at a temperature 10 deg.C higher than the natural heat shrinkage temperature and 5 deg.C lower than the orientation temperature, and in the case of a polyolefine the temperature is slightly below the melting point thereof, and in the case of a polyester, the temperature is preferably 80-100 deg.C.
JP3791681A 1981-03-18 1981-03-18 Method of heat treatment of biaxially oriented film Pending JPS57152922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3791681A JPS57152922A (en) 1981-03-18 1981-03-18 Method of heat treatment of biaxially oriented film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3791681A JPS57152922A (en) 1981-03-18 1981-03-18 Method of heat treatment of biaxially oriented film

Publications (1)

Publication Number Publication Date
JPS57152922A true JPS57152922A (en) 1982-09-21

Family

ID=12510862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3791681A Pending JPS57152922A (en) 1981-03-18 1981-03-18 Method of heat treatment of biaxially oriented film

Country Status (1)

Country Link
JP (1) JPS57152922A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0707942A3 (en) * 1994-10-20 1997-01-02 Interventional Technologies Method for manufacturing a polymeric material with enhanced mechanical properties

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0707942A3 (en) * 1994-10-20 1997-01-02 Interventional Technologies Method for manufacturing a polymeric material with enhanced mechanical properties

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