| 摘要 |
PROBLEM TO BE SOLVED: To provide a plastic bottle capable of enhancing a strength against a drop impact even in the case where it is lightened.SOLUTION: The bottom part 6 of a biaxially stretch blow-molded plastic bottle comprises: a peripheral edge part 21 to be grounded in the case where the bottle is made to self-support; a midship part 23 formed to rise from the peripheral edge part 21; and a dome part 25 protruded to rise further at one step from the central part of the midship part 23. A plurality of concave grooves 27 are individually formed at least over the peripheral edge part 21 and the midship part 23 but not at the dome part 25. |
