| 摘要 |
<p>An extruder (13) projects through a bulkhead (10) adapted to form part of a vacuum chamber (11), and a die (14) is mounted on the end of the extruder within the vacuum chamber. The extruder projects through a gland seal (40) which is formed in a sleeve surrounding the extruder. The seal (40) includes a plurality of seal rings surrounding the extruder (13) and packed in the sleeve and held in place in a preferred form by a yieldable retainer. A shaper (20) is positioned down stream of the die (14) and is clamped (36) to the upstream end of the die (14). The shaper (20) is mounted on tracks (29) on a girder extending from the bulkhead (10) clear of its periphery. The apparatus permits congruent axial movement of the extruder (13), die (14) and shaper (20) with respect to the bulkhead (10).</p> |
