| 摘要 |
Extruded pipes of thermoplastically processable polymers are wound cold around a mandrel and thereafter subject to thermal fixing. During or before winding, the pipe is twisted in a direction opposite to that of the helix formation, about its longitudinal axis, preferably through angles of 5 DEG to 360 DEG per coil. The resilience of the coiled pipe is surprisingly improved to the point where the resilience factor R approaches 1.0.
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