| 摘要 |
An annular extrusion die comprises a body, a die and a mandrel mounted on a mandrel-holder and consists of inlet and outlet portions forming a channel for flow of the melt. The mandrel-holder is made of two parts with possibility of reciprocating motion of one part relative to the other. The die and outlet portion of mandrel are secured on the movable part of the mandrel-holder so that the length of channel can be changed. |
