| 摘要 |
PURPOSE:To improve the formability of a formed object by laminating a steel sheet on the biaxially oriented polyester film having the specified strength in elongation and unevenness of thickness. CONSTITUTION:A formed object is obtained by laminating a steel sheet on the biaxially oriented polyester film having the strength F100 of 0.5 - 5.0 kg/mm<2> in the atmosphere of 150 deg.C and at the elongation of 100% and the thickness- unevenness of at most 40%. The polyester to the used is made of one kind or at least two kinds of dicarboxylic acid such as terephthalic acid or oxalic acid as the dicarboxylic acid component. As diol component, one kind or at least two kinds of the diol component such as ethylene glycol or propylene glycol are used. The film having the strength F100 is deteriorated in its formability, and when F100 is smaller than 0.5 kg/mm<2>, the film is deformed unevenly in forming. In the film having the thickness-unevenness exceeding 40%, its formability and the elongation in forming etc., become ununiform, and the rapture and the separation between layers in forming integrally with the metal way occur, so its working properties are not preferable. |
