| 摘要 |
The apparatus has a pipe head provided with an external nozzle (22) for extrusion of an external hose and an internal nozzle (21) for extrusion of an internal hose. A support air channel opens out of the pipe head between the external nozzle and the internal nozzle. The support air channel is configured as a support air and venting channel (24), which is constantly open to the atmosphere, where the channel is adjacent to a region between the internal nozzle and the external nozzle in an annular-cylindrical manner and concentric with respect to a center longitudinal axis. |
