| 摘要 |
A strand shaping part for connecting an extruder (1) to a granulating system has a number of supply channels (8) that can be flow-connected to the exit opening (5) of the extruder (1). These supply channels lead to gear pumps (21), which have a delivery behavior that is as constant as possible and with which the flow of melt to channels (11) can be blocked during start up. A single channel (11) leads from each gear pump (21) to a strand die (9) that can be formed by holes of a perforated plate (10) connected to a perforated plate head (7). A number of gear pumps (21) are driven by a common shaft (24). The method for starting a granulating system provided with a strand shaping part of the aforementioned type provides that the extruder (1) is firstly started until a sufficient pressure is built up at the entrance (27) of each gear pump (21). Once this pressure is reached, each gear pump (21) is started again. In an underwater granulating system, the granulating blades (12) are rotationally driven last. |
