LARGE-SIZED QUARTZ GLASS PIPE, LARGE-SIZED QUARTZ GLASS PREFORM AND THEIR PREPARATION

摘要

(57) Abstract Objective It mass produces the optical fiber of Takasina rank, is low cost conversionQuartz glass tube and large-sized quartz gara of the large-sized high order accuracy which it is possibleOffer supurihuomu. Constitution Nature or synthetic quartz glass element tube non contact die addingTreating with thermal process modulo, becomes the major diameter which 50 - 300mm, outsideDiameter/inside clearance ratio =1.1 - 7, above thickness 10mm, thickness errorLarge-sized quartz glass tube of 2% or less and below internal roughness 20 millimicron,And large-sized quartz glass tube and core glass rod rodUnifying with in tube modulo, large-sized quartz garasupurihu which becomesomu. As for the above-mentioned large-sized quartz glass tube major diameter 50 - 300mm Ratio of major diameter and inside diameter 1.1 - 7, above thickness 10mm,Quartz glass element tube of thickness error 2% or less non contact die heating processingWith law major diameter (D₀) of the quartz glass element tube and inside diameter (D _i)Major diameter (d₀) of tube after the ratio (D₀ /D _i) and heating process treatingWith ratio (d₀ /d _i) of inside diameter (d _i), (D₀ /D _i)/Way (it becomes d₀ /d _i) 1.0 - 1.5, the internal pressure the short storyThe roll doing, with 1600 - the 3000 heating treatment and heating stretchingOr it is produced heating compressed stretching by treating.