| 摘要 |
The invention relates to an extrusion head (1, 2, 3) having a perforated plate (4) of a granulating system (30). The extrusion head (1, 2, 3) has a head part (32) and a perforated plate (4). The perforated plate has a central cone part (10) on which flow is incident, nozzle channels (9), and hole nozzles (7), and is detachably fastened to the head part (32). The head part (32) of the extrusion head (1, 2, 3) has at least one central melt channel (44), into which the cone part (10) of the perforated plate (4) on which flow is incident protrudes. The cone part distributes the melt flow among annularly arranged nozzle channels (9) and among the hole nozzles (7) arranged at least in one ring (8). The perforated plate (4) has a multi-part construction and comprises a perforated-plate wear insert (5), a perforated-plate main body (6), and a cone part (10) on which flow is incident. The perforated plate has a corrosion-protected fastening part (29), which detachably holds the multi-part perforated plate (4) together. The at least one fastening part (29) is arranged in a central region of the at least one ring (8) of the hole nozzles (7). |
