![]() Therefore, the lower end has a largerdiameter than the middle part of the glass preform. the glass soot preform quickly shrinks.Since the lower end of the soot preform has a large surface area to be heated than the middle part, the former is more easily heated, that is, more easily shrinks than the latter. 6, it was found that a heating rate between the first heating step and the heating step for vitrification has some influence on the uniformity of theouter diameter of the vitrified preform, namely a difference of the outer diameter between the lower end and the middle part of the preform. In addition to the absence of bubbles in the preform, a uniform outer diameter of the vitrified preform is also important. direct drawing of molten glass from nozzles Cooling fins therefor C03B37/02- Manufacture of glass fibres or filaments by drawing or extruding, e.g.C03B37/01446- Thermal after-treatment of preforms, e.g. ![]() vapour phase deposition of bulk porous glass either by outside vapour deposition, or by outside vapour phase oxidation or by vapour axial deposition C03B37/014- Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g.C03B37/012- Manufacture of preforms for drawing fibres or filaments.C03B37/01- Manufacture of glass fibres or filaments.C03B37/00- Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags.C03B- MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES.Assignors: DANZUKA, TOSHIO, ITO, MASUMI, TSUCHIYA, ICHIRO Application granted granted Critical Publication of US5330548A publication Critical patent/US5330548A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links reassignment SUMITOMO ELECTRIC INDUSTRIES, LTD. Priority claimed from JP3179814A external-priority patent/JP2836302B2/en Priority claimed from JP8864092A external-priority patent/JP2985493B2/en Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Family has litigation Priority claimed from JP3-179814 external-priority First worldwide family litigation filed litigation Critical (A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License. Original Assignee Sumitomo Electric Industries Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/913,965 Inventor Toshio Danzuka Masumi Ito Ichiro Tsuchiya Current Assignee (The listed assignees may be inaccurate. Google Patents Method for producing glass preform for optical fiberĭownload PDF Info Publication number US5330548A US5330548A US07/913,965 US91396592A US5330548A US 5330548 A US5330548 A US 5330548A US 91396592 A US91396592 A US 91396592A US 5330548 A US5330548 A US 5330548A Authority US United States Prior art keywords preform heating temperature glass vitrified Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5330548A - Method for producing glass preform for optical fiber US5330548A - Method for producing glass preform for optical fiber
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