Sughrue Mion, PLLC
Polyester film and manufacturing method thereof
Provided is a polyester film having excellent high-temperature dimensional stability. More particularly, provided is a method for producing a polyester film, including: a) extruding and cooling a polyester resin to provide a non-oriented sheet; b) orienting the sheet in the machine direction (MD); c) orienting the MD oriented sheet in the transverse direction (TD); d) heat treating the sheet; and e) carrying out simultaneous relaxation by subjecting the heat treated sheet to MD relaxation at a ratio of 1% or higher, while subjecting it to TD relaxation in a tenter. Provided also is a polyester film obtained by the method.
KOLON INDUSTRIES, INC.
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B29K B29C C08J B29C B29C B29C B29C B32B B29D B32B B29C B29C C08J B29C B29C B29C B29C B32B B29C
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Gi Sang Yun Jo Si Min
Song Kim Kim