| 摘要 |
An extruder head assembly includes an extruder head having an abutment face and an internal flow channel terminating at the abutment face; first and second preforming dies and a preforming die drum removably accommodating the first and second preforming dies in a spaced relationship to one another. The drum is supported at the extruder head for rotation about an axis relative to the extruder head for selectively aligning one of the first and second preforming dies with the internal flow channel at the abutment face of the extruder head. Further, a releasable immobilizing mechanism is provided for pressing the drum against the abutment face, thereby placing the preforming die-aligned earlier with the flow channel-in an operative position.
|
