| 摘要 |
<p>A preform (1) for small flat container formed of a flat core capable of adjusting the limit of wall thickness thereof by reducing the wall thickness of the outer side of a thick-walled shell part formed by stepping up, wherein an inner diameter is formed in a small complete round, a shell part (12) is formed by stepping out to a diameter larger than the diameter of a neck part from a boundary between the neck part (11) and the shell part (12), the outer side of the shell part is formed in an elongated circular shape by reducing wall thickness from the underside of the stepped out part to provide a difference in wall thickness between the forward and backward surface sides (12a) and right and left surface sides (12b) of the shell part (12), and the stepped out part (14) is provided in disk shape on the underside of the neck part.</p> |
