| 摘要 |
Apparatus (10) for preparing a tubular parison, which is continuously extruded in an extrusion direction from an extrusion head (30), and for subsequently transferring the parison to a blow molding machine (12). The apparatus (10) provides improved control of the wall thickness of the parison and can be used with particular advantage in making articles requiring parisons of large diameter and length. The apparatus (10) includes a parison stretching mechanism (40) that grasps and seals the parison at one location along its length and stretches the parison at a controlled rate while being extruded in the extrusion direction. The apparatus (10) also sequentially severs sections of the parison from the remaining continuously extruded portion and transfers each section to a stationary blow molding machine (12) out of the path of this remaining portion. These operations are performed by a parison transfer mechanism (100) that grasps and seals the parison at a second location along its length intermediate the one location and the extrusion head (30) to thereby define a parison section. The section is severed from the remaining portion of the parison, is transferred in a direction transverse to the extrusion direction away from the extrusion head (30) and is subsequently delivered to the molding machine (12) in a direction generally parallel to the extrusion direction. |
