| 摘要 |
<p>PURPOSE:To obtain a blow molded member such as largely stretchable and bendable bellows. CONSTITUTION:In bellows, the outer walls of the V-shape parts holding valleys of the bellows form an edge like acute angle and the wall thickness t1 of the leading end part of each valley 13 is less than the wall thickness t0 in the vicinity thereof. The bellows is produced by a usual blow molding method using a mold whose inner wall is equipped with wedge-shaped projections 17a formed into a sharp edge like shape at the tip parts thereof and the recessed parts 18 formed between the projections.</p> |
