The base material ingot is transparent and can be easily passed through by light, but the light transmitted upward cannot pass beyond the border with the unsintered portion in the upper region. The heat radiated by the heat generators in the heating furnace is transmitted vertically within the base material ingot. In the furnace extension process, the base material ingot is inserted to a heating furnace whose temperature is raised to approximately 2,000° Celsius to be softened in the furnace, and the molten preform is drawn from below the heating furnace. Y02P40/57- Improving the yield, e-g- reduction of reject rates.reusing waste heat during processing or shaping Y02P40/00- Technologies relating to the processing of minerals.Y02P- CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS.Y02- TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE.Y- GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS AND DIGESTS.C03B37/01466- Means for changing or stabilising the diameter or form of tubes or rods.C03B37/0124- Means for reducing the diameter of rods or tubes by drawing, e.g.diameter, of tubes or rods in general, e.g. C03B37/01225- Means for changing or stabilising the shape, e.g.C03B37/01205- Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments.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: SHIMIZU, YOSHIAKI Publication of US20120055199A1 publication Critical patent/US20120055199A1/en Application granted granted Critical Publication of US8661857B2 publication Critical patent/US8661857B2/en Status Active legal-status Critical Current Adjusted expiration legal-status Critical Links ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). reassignment SHIN-ETSU CHEMICAL CO., LTD. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from JP2008-228909 external-priority Application filed by Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Chemical Co Ltd Assigned to SHIN-ETSU CHEMICAL CO., LTD. Original Assignee Shin Etsu Chemical Co 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.) ( en Inventor Yoshiaki Shimizu Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US13/040,141 Other versions US8661857B2 Google Patents US20120055199A1 - Method of manufacturing optical fiber preform US20120055199A1 - Method of manufacturing optical fiber preform
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