| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bottle with an improved mouth shape to prevent damage on the inside of an inside-plug fitting cylinder when being pluged even with the damage of the inner periphery of the top surface of a mouth portion due to the strike of two mouth portions of the bottles against each other. SOLUTION: A diameter of the upper portion of an inner peripheral surface 1a of an opened end portion of a preform for a stretch blow molding bottle is enlarged to form an enlarged diameter surface 8 orthogonal to a top surface 4 and having a certain height. Especially, polyethylene terephthalate is adopted as a material resin of the preform.</p> |
