| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that when a blow molding having a margin for attachment to another part is strongly fastened to an opponent part with a bolt or the like, a resin material causes so-called fatigue due to a stress relaxation of the resin material to loosen the cherished fastening and that in order to avoid the relaxation, when a metallic collar is let to engage with the margin for attachment to prevent the relaxation, the collar drops due to a vibration and the like during a temporary storage in a storehouse with the collar engaged after the blow molding and a quality control is difficult.SOLUTION: A molding having a margin for attachment is integrally formed by blow-molding a thermoplastic resin, and has at least two stepped parts integrally expanding from the margin. |
