METHOD AND APPARATUS FOR SEALING THE BOTTOM OF A FURNACE FOR DRAWING OPTICAL FIBRE FROM A PREFORM

摘要

An apparatus and method for sealing the bottom of an optical waveguide draw furnace is disclosed. The apparatus includes an assembly constructed and arranged to mate with the bottom of the draw furnace to form a seal, and a leak detection system communicating with the assembly to signal the forming of a proper or an improper seal. The covering plate of the assembly is selectively seated on the sealing plate of the draw furnace to form the seal, and an inert gas is delivered between the covering plate and the bottom of the draw furnace. The flow of the inert gas is detected to determine if the seal has been properly formed. An assembly including a covering plate having at least two radially spaced gaskets circumferentially positioned on the top surface of the covering plate for engagement with the sealing plate at the bottom of the draw furnace, and a method for sealing the bottom of a draw furnace are also disclosed.