METHOD AND INDUCTION FURNACE FOR DRAWING LARGE DIAMETER PREFORMS TO OPTICAL FIBRES,申请号WO2000EP04134-传众专利搜索

METHOD AND INDUCTION FURNACE FOR DRAWING LARGE DIAMETER PREFORMS TO OPTICAL FIBRES

申请公布号：WO0068157(A1)

申请号：WO2000EP04134

申请日期：2000.05.09

申请公布日期：2000.11.16

申请人：

PIRELLI CAVI E SISTEMI S.P.A.;ROBA, GIACOMO, STEFANO;NUTINI, MASSIMO;VERONELLI, FRANCO

发明人：ROBA, GIACOMO, STEFANO;NUTINI, MASSIMO;VERONELLI, FRANCO

分类号：C03B37/012;C03B37/029;H05B6/02;H05B6/20

主分类号：C03B37/012

摘要：An induction furnace capable of drawing large diameter preforms of up to 130 mm is described, including top and bottom chimneys surrounding the entire preform during operation of the furnace with an inert conditioning gas; the latter is introduced into the top chimney and flows downward through the furnace body and bottom chimney without significant turbulence. A distributor ring inside the top chimney redirects flow from a circumferential direction to a downward direction. The top chimney also includes a resilient seal to releasably hold the top of the preform. The bottom chimney has a smoothly decreasing cross-sectional area preventing turbulence at the furnace exit. The furnace insulation is preferably a rigid self-supporting graphite cylinder. A method of drawing large diameter preforms either to an optical fiber or to a preform of smaller diameter using such a furnace is also claimed and disclosed.