| 摘要 |
<p>A preform manufacturing process employs an installation which produces or builds up the preform (1) on a horizontal rotating support core (2), mounted between two support points (3a, 3b), by successive passes of a radially positioned plasma deposition torch (5) parallel to the core (2) axis, followed by one or more automatic glazing passes of the torch without material supply and without preform cooling in order to vitrify the soot deposits. The novelty comprises glazing the preform (1) at low speed (preferably 20-25 mm/min.) from its first end (7) to its second end (8), pre-separating the preform (1) at the first end (7) side, glazing the preform from its first end to its second end and completely separating the preform at the pre-separation location (9).</p> |
