| 摘要 |
The head 7, 8 for extruding tubes for blow moulding, includes a mandrel 4 supported by one part (8), the other part (7) comprising at least one conical wall portion (10) which, with a corresponding mandrel wall portion (9), forms a conical flow space section (11) whose throughflow cross-section can be varied by the relative displacement of the two telescopically engaging parts (7, 8). The variable conical flow space section may be provided downstream of the mandrel support when a conical outlet orifice may be simultaneously altered in width, or a pair of such variable sections 28, Fig. 4, may be provided which are simultaneously varied in opposite sense. <IMAGE>
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