| 摘要 |
An extruder (10) for welding plastic components, comprising a front part (11) for plasticizing and ejecting additional plastic welding material, and a rear part (12), for feeding and breaking up a continuous filament (13) made of the additional plastic material. The rear part (12) comprises a feed channel (20) that cooperates with a worm screw (21) for the advancement of the filament (13). The feed channel (20) is delimited by the thread (24) of the worm screw (21) on one side and by a sliding surface (25) for the filament (13) on the opposite side. The distance between the sliding surface (25) and the crest of the thread (24) decreases in the direction in which the filament (13) is fed, in order to provide scoring of increasing depth on the filament (13). The thread (24) comprises at least one discontinuity (28) of the worm that has a sharp discontinuity end (29) for cropping the filament (13) at the scoring. |
