| 摘要 |
PURPOSE: To eliminate center shift and to prevent the irregularity of heat resistance or thickness by suppressing center shift by supporting the central part of the bottom part of a primary blow bottle by a support member and forcibly moving the support member. CONSTITUTION: The central part 21 of the bottom part of a primary blow bottle 2 is supported by a support member 3 to suppress center shift and the support member 3 is forcibly moved. The support member 3 is held from the inside and outside thereof by the support rod 31 supporting the central part 21 of the bottom part of the primary blow bottle from the inside and an outside support rod 32 to be certainly supported to suppress center shift. The support member 3 is forcibly moved by supporting the lower end 311 of the support rod 31 made slidable up and down within the mandrel 33 supporting a mouth plug part 22 by the cam surface 341 of a cam member 34. The mandrel 33, the support rod 31 and the outside support rod 32 are allowed to advance in the direction shown by an arrow 7 while rotated around the axis of them to generate heat shrinkage by uniform heating. |
