| 摘要 |
The device (12) has a channeling unit (38) for channeling gum until an extrusion orifice (18) for shaping a band. Threads are drowned in the band. The orifice comprises orthogonal symmetry planes (P1, P2) such that an intersection line of the planes is parallel to an extrusion direction (X) of the band. The unit has a main upstream channel (42) extended through symmetrical secondary downstream channels. The upstream channel includes the plane (P1) for a symmetry plane. The upstream and downstream channels include the plane (P2) for another symmetry plane. |
