Crystal pulling unit
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United States of America Patent
Stats
-
Aug 21, 2001
Grant Date -
N/A
app pub date -
Mar 22, 1999
filing date -
Mar 26, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A crystal pulling unit for the production of a crystal block has a recharging tube (7), via which granulate (17) enters into a crucible (2) with a melt (3), located within a container (1). This recharging tube (7) has an annular space (20) between an inner wall (18) and an outer wall (19), which is open on the lower front side of the recharging tube (7) and is connected with the protective gas source (13) to supply protective gas. This protective gas cools the recharging tube (7) and around its outlet, forms a gas mist that prevents the entry of finer fractions of the charging material into the pulling space.
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