| 摘要 |
PROBLEM TO BE SOLVED: To prevent noise caused by the exhaust and occurrence of the recessed portion in the bottom of a container by separating a bottom mold from a container bottom with a knockout rod in contact with the central portion in the container bottom after the biaxially oriented blow molding, and by accommodating the knockout rod in the bottom mold after separating the knockout rod from the central portion in the container bottom. SOLUTION: After the biaxially oriented blow molding, the mold releasing of a bottom portion of a container C and a bottom mold 2, or the knockout is performed by moving only the bottom mold 2 in the contact state of a knockout rod 3 with the central portion in the bottom portion of the container C from the state where the bottom mold 2 and the knockout rod 3 are in contact with the bottom portion of the container C before starting the knockout, so as to achieve the separation from the bottom portion of the container C. After the mold releasing of the bottom portion of the container C and the bottom mold 2, the knockout rod 3 is then moved and separated from the central portion in the bottom portion of the container C. The bottom mold 2 and the knockout rod 3 are then moved and the knockout rod 3 is housed in the bottom mold 2, which completes the knockout of the container C. |
