发明名称 |
Heat treatment of thermoplastic film, and thermoplastic film and method for producing the same |
摘要 |
A thermoplastic film is transversely stretched, and then transported in a heat-treating zone (46) such that the ratio (G/D) of an inter-roll distance (G) to a roll lap length (D) is 0.01 to 3, and the ratio (V2/V1) of an exit-side transporting speed (V2) to an entry-side transporting speed (V1) is 0.6 to 0.999. The thermoplastic film is heat-treated in the heat-treating zone (46) at (Tg−20)° C. to (Tg+50)° C., in which Tg is the glass transition temperature of the film. The heat-treated thermoplastic film exhibits an Rth/Re ratio of at least 0.5 and less than 1, an Rth/Re ratio range of 0.01 to 0.1 in the width direction, and a thermal dimensional change of 0.001% to 0.3% under conditions of 80° C. and 200 hours. |
申请公布号 |
US8153044(B2) |
申请公布日期 |
2012.04.10 |
申请号 |
US20080104826 |
申请日期 |
2008.04.17 |
申请人 |
HASHIMOTO KIYOKAZU;YOSHIDA TETSUYA;OTOSHI MASAAKI;FUJIFILM CORPORATION |
发明人 |
HASHIMOTO KIYOKAZU;YOSHIDA TETSUYA;OTOSHI MASAAKI |
分类号 |
B29C71/00;B29D7/01;B29D11/00 |
主分类号 |
B29C71/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|