| 摘要 |
Disclosed is a bottle-shaped synthetic resin article molded by direct blowing that inhibits the occurrences of dents on the bottom surface center caused by heat from the parison cut-off part, by radially arranging three or more cut-off lines residually formed on the bottom surface of the article. Also, in the case of a rectangular prism-shaped article, extreme thinning of the material is prevented by reducing the stretching amount in the legs. This is achieved by arranging four cut-off lines in a cross on the diagonals of the bottom surface, with one of the diagonal lines positioned on a parting line, and arranging the ends of each cut-off line so that they are in close proximity of the legs of the bottom part, which are formed by partial stretch molding. Furthermore, each edge line of the body is formed into the same spiral pattern, and, among the four edge lines, a parting line is arranged on top of two of the edge lines. The parting line thus enables the exterior appearance of the body to be maintained. |
