| 摘要 |
The invention relates to a device and a method for producing a preform (3) having a base geometry optimized for the subsequent stretch blow moulding process. The preform produced in the injection-moulding tool is removed in a cooled removal sleeve (7) and cooled in the shaft by intensive contact cooling, while as far as possible no cooling contact is made with the top of the preform on account of a special contour of the cooling sleeve. On account of the reheating of this top which is possible as a result, the latter can be mechanically deformed into a new geometry which is more advantageous for the blow moulding process and thus the wall thickness of said top can also be influenced. In the subsequent blow moulding process, such a deformed preform has primarily the advantage that the plastics material distributed better in the bottle can result in considerable material savings and higher quality bottle bases. |
