| 摘要 |
In the prodn. of extruded branched pipes or sheaths, a second retractable die with at least two moving parts (9B) is at the outlet of the die (2) at the extruder tube head, which can be moved together and apart from each other. A main mandrel (7), at the tube head, has at least two dividing mandrel rods (8a, 8b) extending in parallel from the extrusion die (2), from the end of the main mandrel (7). When the moving parts (9B) of the second die are brought together, their shape structure divides the cross section of the extrusion from the main die (2) with two extra dies round the dividing mandrel rods (8a, 8b), to give simultaneous extrusion of two tubes (T2, T3). When the moving parts (9B) are separated, the main die (2) extrudes a single tube (T1). Also claimed is an appts. with an extruder tube head with a second retractable die with at least two moving parts (9B) which can be moved towards and away from each other. The parts, when brought together, divide the cross section of the extrusion from the main die to form at least two dividing dies. Two dividing mandrels (8a, 8b), in parallel, are in front of the main die at the end of the main mandrel (7).
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