JPS648020A - Relaxation heat treating method for polyester film - Google Patents

Relaxation heat treating method for polyester film

Info

Publication number
JPS648020A
JPS648020A JP16482587A JP16482587A JPS648020A JP S648020 A JPS648020 A JP S648020A JP 16482587 A JP16482587 A JP 16482587A JP 16482587 A JP16482587 A JP 16482587A JP S648020 A JPS648020 A JP S648020A
Authority
JP
Japan
Prior art keywords
relaxation
heat treatment
film
longitudinal direction
relaxation heat
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
JP16482587A
Other languages
Japanese (ja)
Inventor
Nobutaka Funayama
Koji Nakahara
Hideki Yamagishi
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.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
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 Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP16482587A priority Critical patent/JPS648020A/en
Publication of JPS648020A publication Critical patent/JPS648020A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prepare a polyester film of superior heat dimension stability both in longitudinal and width directions by carrying out relaxation heat treatment at a specific relaxation rate in the width direction of the polyester film and the relaxation heat treating by a given relaxation rate in the longitudinal direction of the film. CONSTITUTION:Relaxation heat treatment of 1-10% relaxation rate is carried out in the width direction of a film, and then relaxation heat treatment of 0.5-4.0% relaxation rate is carried out in the longitudinal direction of the film by holding both ends of the film with an endless belt, the peripheral speed of which gets slower step by step. The relaxation heat treatment temperature in the longitudinal direction is preferably lower than the heat treatment temperature in the width direction. This is because if the relaxation heat treatment temperature of the longitudinal direction is higher than that of the width direction, the effect of relaxation heat treatment in the width direction is nullified, and a film of good heat dimension stability is hard to prepare. In case the heat treatment temperature in the longitudinal direction is lower than 140 deg.C, the heat dimension stability in the longitudinal direction is difficult to be improved.
JP16482587A 1987-06-30 1987-06-30 Relaxation heat treating method for polyester film Pending JPS648020A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16482587A JPS648020A (en) 1987-06-30 1987-06-30 Relaxation heat treating method for polyester film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16482587A JPS648020A (en) 1987-06-30 1987-06-30 Relaxation heat treating method for polyester film

Publications (1)

Publication Number Publication Date
JPS648020A true JPS648020A (en) 1989-01-12

Family

ID=15800634

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16482587A Pending JPS648020A (en) 1987-06-30 1987-06-30 Relaxation heat treating method for polyester film

Country Status (1)

Country Link
JP (1) JPS648020A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012056220A (en) * 2010-09-10 2012-03-22 Toray Ind Inc Biaxially oriented polyethylene terephthalate film for hard coats
US8334363B2 (en) 2007-01-31 2012-12-18 Georgia-Pacific Chemicals Llc Oxidized and maleated compounds and compositions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8334363B2 (en) 2007-01-31 2012-12-18 Georgia-Pacific Chemicals Llc Oxidized and maleated compounds and compositions
JP2012056220A (en) * 2010-09-10 2012-03-22 Toray Ind Inc Biaxially oriented polyethylene terephthalate film for hard coats

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