| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily deform and fold flat, a plastic bottle after using of its contents. SOLUTION: At least two or more reinforcing recessed grooves 7 extending in the peripheral direction of a body part 4 are uneven recessed groove 7a, 7b. They continue with roughly the same groove depth in each flat wall part 2, but the depth becomes zero or near zero near the origin of the arc shaped part of a pair of corner parts 3 on either of the diagonal lines of four arc shaped corner parts 3 of the body part 4, and in a pair of arc shaped corner parts on the other diagonal line they are as deep as those in each flat wall part 2. The position where the groove depth of either of the grooves 7a, 7b becomes zero or near zero deviates 90 deg. relative to the center axis of a bottle 1 from the position of the corner part 3 where either of the other uneven grooves 7a, 7b becomes zero or near zero.</p> |
