| 摘要 |
Molten polymer (23) from an extruder is cooled in passages in two sequential sections (36,37). The cooling arrangements (45 to 48) in the two sections are separate and the passage walls (27,28) in the second section (37) are cooler than those of the first section (36) to promote slip of the melt (23) at the wall surfaces (27,28). |
