| 摘要 |
PURPOSE:To make the wall thickness of a molding uniform as much as possible and increase the degree of freedom of surface shape by forming one surface of a blow molded body continuing to a holding section by means of a slide mold slide moving in the direction crossing a mold surface forming one surface of a blow molding continuing to the holding section with a very small angle. CONSTITUTION:A mold main body 20 is divided with a flat surface including a center axis of a tank 1, and mold dividing direction is the arrow direction D vertical to a mold face 20a forming one side face 10. A slide mold 21 is provided with the mold face 21a forming a recessed section 11 and a U-shaped section 21b forming a holding section 21, and its sliding direction C crosses the mold face 21a and the mold face 20a of the mold main body 20 by the angle of 5 deg.. In the case that said tank 1 is formed by said molding die 2, an expanded parison enters the U-shaped section 21b to form the holding section 12. The wall thickness of holding section 12, therefore, is thinner to some extent compared with the section of one side face 10 formed with the mold face 20a, and as the angle difference is small, the thickness in the practical range can be retained. |
