| 摘要 |
<p>PURPOSE:To improve transparency, molding property, and gas barrier property by drawing a specific copolyester at a specific drawing index. CONSTITUTION:A hollow molding is formed through the esterification of dicarboxylic acid and ethylene glycol, in which 85 - 99.5mol% of the dicarboxylic acid is terephthalic acid and 0.5 - 20 mole % is isophthalic acid, and consists of copolyester of being 0.5 - 1.5dl/g in its limiting viscosity wherein the drawing index defined by a formula (I) is highly drawn into 130cm or more. In the formula (I), the content volume of the drawn hollow molding is the content volume below a support ring 8 of the hollow molding 1 except a mouth plug part 2 and the content volume of a non-drawn preform is the content volume below the support ring 8 of a preform 7 except the mouth plug part 2, furthermore, the inner surface area of the drawn hollow molding is the inner surface area of the drawn hollow molding below the hollow molding 1 except the mouth plug part 2.</p> |
