JPH07330362A - Method for processing tip of preformed material for spinning glass fiber and apparatus therefor - Google Patents
Method for processing tip of preformed material for spinning glass fiber and apparatus thereforInfo
- Publication number
- JPH07330362A JPH07330362A JP14576894A JP14576894A JPH07330362A JP H07330362 A JPH07330362 A JP H07330362A JP 14576894 A JP14576894 A JP 14576894A JP 14576894 A JP14576894 A JP 14576894A JP H07330362 A JPH07330362 A JP H07330362A
- Authority
- JP
- Japan
- Prior art keywords
- conical
- base material
- conical surface
- burner
- trowel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/47—Shaping the preform draw bulb before or during drawing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガラスファイバを紡糸
する母材先端を仕上加工する仕上加工方法およびその装
置に関するものであり、新しい母材をセットして紡糸を
開始してから紡糸が安定するまでの間に発生する不良フ
ァイバの長さを著しく短縮することができ、したがっ
て、母材から紡糸されるガラスファイバの歩留まり、紡
糸装置の可動効率を著しく向上させることができるもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finishing method and apparatus for finishing the base material tip for spinning glass fiber, and the spinning is stable after a new base material is set and spinning is started. The length of the defective fiber generated up to that time can be remarkably shortened, so that the yield of the glass fiber spun from the base material and the moving efficiency of the spinning device can be remarkably improved.
【０００２】[0002]
【従来の技術】光ファイバは母材を線引炉内にセットし
てこれを加熱し、その先端を溶融させた状態から線引き
して製造されるものであるが、その母材先端の円錐面が
平滑面にならなければ紡糸は安定しない。他方、母材の
先端をバーナーによって加熱しつつ母材をゆっくりと回
転させて、その先端を円錐状に加工して、紡糸が可及的
に速やかに安定するようにしている。その加工装置、す
なわちガラス旋盤１の概略は図２に示すとおりであり、
上下フレーム２、３に設けた上部チャック４、下部チャ
ック５によって母材６（すなわち石英ロッド）のロッド
６ａの上下両端を把持させ、上下に往復動するトラバー
ス機構８に取付けた酸水素バーナー７によってその下部
を加熱しながらこれをゆっくりと回転させて、円錐状に
加工するものである。この従来の酸水素バーナー７によ
る加熱ではカーボンヒータによる加熱より高温になる
が、ヒートゾーンが狭いのでガラス旋盤による加工で
は、母材６の直径が６０ｍｍ程度になると、母材先端が
円錐面状になるが、その円錐面は図４の６Ａのように波
打ち、図４の６Ｂのような平滑な円錐面にはならない。
このようにしてガラス旋盤加工された母材６を線引炉２
１に装着し、そのヒータ２２によって母材先端を約２０
００℃に加熱して例えば線径１２５μｍのガラスファイ
バ２３を紡糸する。上記のように円錐面が波打っている
母材から線引きを開始すると、線引きが進むにつれて円
錐面が徐々に平滑になり、やがて図４の６Ｂのようにな
る。その間に線引きされたガラスファイバはその線径が
安定せず、不良ファイバとして廃棄せざるを得ない。こ
の不良ファイバの長さはほぼ２０ｋｍに達し、母材が相
当に無駄になり、不良ファイバを線引きする間の紡糸装
置の稼動は全く無駄になる。この線引きを速やかに安定
させて不良ファイバの長さを可及的に短くすることが線
引き作業の効率化、能率化のために望まれるところであ
る。母材の円錐面が図４の６Ａのように波打つのは、酸
水素バーナー７による加熱温度が線引き温度よりも高温
（２千数百℃）になるが、酸水素バーナー７によるヒー
トゾーン（火炎が当たる表面積）が小さく、狭い表面が
局部的に加熱され、その被加熱面が繰り返し移動するこ
とに起因している。これを防ぐために、カーボンヒータ
によって母材先端を線引き温度（約２千℃）に加熱して
ガラス旋盤加工を行うことも可能であるが、これでも上
記の円錐面の凹凸は幾分軽減される程度であり、しかも
その加熱温度が２０００℃と低いために、ガラス旋盤加
工時間が著しく長く、実用的ではない。2. Description of the Related Art An optical fiber is manufactured by setting a base material in a drawing furnace, heating it, and drawing it from a state where its tip is melted. If the surface does not become smooth, spinning is not stable. On the other hand, the base material is slowly rotated while being heated by a burner to process the base material into a conical shape so that the spinning is stabilized as quickly as possible. An outline of the processing apparatus, that is, the glass lathe 1 is as shown in FIG.
The upper chuck 4 and the lower chuck 5 provided on the upper and lower frames 2 and 3 hold the upper and lower ends of the rod 6a of the base material 6 (that is, the quartz rod), and the oxyhydrogen burner 7 attached to the traverse mechanism 8 that reciprocates up and down. While heating the lower part, this is slowly rotated to form a conical shape. The heating by this conventional oxyhydrogen burner 7 becomes higher than the heating by the carbon heater, but since the heat zone is narrow, when the diameter of the base material 6 is about 60 mm, the base material tip becomes a conical surface when processing by the glass lathe. However, the conical surface is wavy like 6A in FIG. 4, and does not become a smooth conical surface like 6B in FIG.
The base material 6 thus glass-lathe processed is drawn into the drawing furnace 2
1 and the heater 22 is used to move the base metal tip to about 20
The glass fiber 23 having a wire diameter of 125 μm is spun by heating to 00 ° C. When drawing is started from the base material having the wavy conical surface as described above, the conical surface is gradually smoothed as the drawing progresses, and eventually becomes 6B in FIG. The diameter of the glass fiber drawn during that time is not stable and must be discarded as a defective fiber. The length of this defective fiber reaches almost 20 km, the base material is considerably wasted, and the operation of the spinning device during the drawing of the defective fiber is completely wasted. It is desired to stabilize this drawing promptly and shorten the length of the defective fiber as much as possible in order to improve the efficiency and efficiency of the drawing work. The conical surface of the base material is wavy like 6A in FIG. 4 because the heating temperature by the oxyhydrogen burner 7 becomes higher than the drawing temperature (2,000 to several hundred degrees Celsius), but the heat zone (flame by the oxyhydrogen burner 7 The surface area is small and the narrow surface is locally heated, and the heated surface repeatedly moves. In order to prevent this, it is possible to heat the base material tip to a drawing temperature (about 2,000 ° C.) with a carbon heater to perform glass lathe processing, but even with this, the above concavity and convexity of the conical surface is somewhat reduced. However, since the heating temperature is as low as 2000 ° C., the glass lathe processing time is extremely long, which is not practical.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、従来のガラ
ス旋盤によって加工された母材先端の円錐表面を物理的
に速やかに平滑できるよう、母材先端の円錐表面の仕上
加工法を工夫することをその課題とするものである。DISCLOSURE OF THE INVENTION The present invention devises a finishing method for the conical surface of the base material tip so that the conical surface of the base material tip processed by a conventional glass lathe can be physically and quickly smoothed. That is the subject.
【０００４】[0004]
【課題を解決するための手段】上記課題解決のために講
じた手段は、バーナーを用いてガラス旋盤加工した母材
を同ガラス旋盤の上部チャックに把持させて同バーナー
によって加熱しながら、ゆっくり回転させ、下部チャッ
クに装着した内面円錐状の円錐こてを回転させ、かつ上
下往復動させてその円錐状内面を母材先端の円錐面に当
接させて同円錐面を平滑に仕上加工することである。[Means for Solving the Problems] The means taken for solving the above-mentioned problems are as follows: The base material, which has been subjected to glass lathe processing with a burner, is gripped by an upper chuck of the glass lathe and is slowly rotated while being heated by the burner. Then, the conical iron trowel mounted on the lower chuck is rotated and reciprocally moved up and down to bring the conical inner surface into contact with the conical surface at the tip of the base metal to finish the conical surface smoothly. Is.
【０００５】[0005]
【作 用】酸水素バーナーを用いてガラス旋盤加工し
た母材の円錐面は局部的に加熱されて溶融しているの
で、円錐こての平滑な円錐面を繰り返し母材の円錐面に
当接させることによって、波打ったその表面は平滑面に
加工される。円錐こてを母材同様に回転させながらその
円錐面を母材の円錐面に軽く当接させ、この当接を繰り
返すことによって母材の円錐面が仕上加工されるので、
円錐こてとの接触によって母材の円錐面が傷付けられる
ことはない。したがって、母材の円錐面の表面は速やか
に平滑に仕上げ加工される。それゆえ、線引炉に新たな
母材をセットして線引きを開始すると速やかに線引きは
安定し、線引きが安定するまでに紡糸される不良ファイ
バの長さは著しく短縮される。なお、上記の円錐こては
カーボンこてが最も望ましいが、溶融した母材の円錐面
に当接しても熱的に安定しているもので、かつその円錐
状内面を平滑に加工できるものであればその材料の如何
を問わない。[Operation] The conical surface of the base metal that has been glass lathe processed with an oxyhydrogen burner is locally heated and melted, so the smooth conical surface of the conical trowel repeatedly contacts the conical surface of the base material. By doing so, the corrugated surface is processed into a smooth surface. While rotating the conical trowel in the same manner as the base metal, the conical surface is lightly contacted with the conical surface of the base material, and by repeating this contact, the conical surface of the base material is finished,
The conical surface of the base material is not damaged by the contact with the conical trowel. Therefore, the conical surface of the base material is quickly and smoothly finished. Therefore, when a new preform is set in the drawing furnace and the drawing is started, the drawing is quickly stabilized, and the length of the defective fiber spun by the time the drawing is stabilized is significantly shortened. The above conical trowel is most preferably a carbon trowel, but it is one that is thermally stable even if it comes into contact with the conical surface of the molten base material, and that the conical inner surface can be processed smoothly. It doesn't matter what material you use.
【０００６】[0006]
【実 施 例】この実施例は、直径６０ｍｍの母材をガ
ラス旋盤加工する場合の例である。通常直径６０ｍｍの
母材先端はその円錐角度θ1が約５０〜６０度になるよ
うにガラス旋盤加工される。円錐こて１１はカーボン製
で直径Ｄが７０ｍｍ、中心孔の直径ｄが１０ｍｍの円筒
体であり、その凹状の円錐面１２の円錐角度θ2は６０
度である。そしてこの内面の表面粗さは５μｍ以下に仕
上げられている。この円錐こて１１の下端面に母材６の
ロッド６ａと同様のロッド１１ａを有する基板１１ｂａ
を固着している。ガラス旋盤１によって母材の下端をガ
ラス旋盤加工した後、その母材６のロッド６ａをその根
元から切除して下部チャック５から外し、下部チャック
５に上記ロッド１１ａを把持させて円錐こて１１を装着
する。その後再び上部チャック４、下部チャック５によ
り母材６、円錐こて１１をゆっくりと回転させ、酸水素
バーナー７を、約３０秒／１回の間隔で上下に往復させ
る。このとき、円錐面１２の母材下部円錐面への押付力
が２０Ｋｇ程度になるように下部チャック５を上下約１
５０ｍｍのストロークで往復動させて、約２秒間その円
錐面１２を母材下部の円錐面に当接させる。このように
して約５分間仕上加工を行うと、母材の円錐面の表面は
平滑に仕上加工される。ガラス旋盤加工直後の円錐面の
波打ちは最大５ｍｍ（図４（イ）参照）であるが、この
仕上加工によって最大１ｍｍ以下の平滑な円錐面に仕上
げられる。このものを線引炉に装着して１０ｍ／秒の速
度で線引きを開始すると、約５００秒で線引きは安定
し、その間の不良ファイバの長さは約５ｋｍ（従前は２
０ｋｍ）に止まる。これは本発明による仕上加工をしな
い母材で線引きを行う場合の不良ファイバの長さの１／
４にすぎない。[Examples] This example is an example of glass lathing a base material having a diameter of 60 mm. Usually, the front end of the base material having a diameter of 60 mm is subjected to glass lathe processing so that the cone angle θ 1 becomes about 50 to 60 degrees. Conical trowel 11 has a cylindrical body of diameter D is 70mm made of carbon, the diameter d of the center hole 10 mm, cone angle theta 2 of the concave conical surface 12 is 60
It is degree. The inner surface has a surface roughness of 5 μm or less. A substrate 11ba having a rod 11a similar to the rod 6a of the base material 6 on the lower end surface of the conical iron 11.
Is stuck. After the lower end of the base material is subjected to glass lathe processing by the glass lathe 1, the rod 6a of the base material 6 is cut off from its root and removed from the lower chuck 5, and the lower chuck 5 holds the rod 11a to conical tip 11 Put on. After that, the base material 6 and the conical iron 11 are slowly rotated again by the upper chuck 4 and the lower chuck 5, and the oxyhydrogen burner 7 is reciprocated up and down at intervals of about 30 seconds / once. At this time, the lower chuck 5 is moved up and down by about 1 so that the pressing force of the conical surface 12 against the lower conical surface of the base material is about 20 kg.
It is reciprocated with a stroke of 50 mm to bring the conical surface 12 into contact with the conical surface of the lower part of the base material for about 2 seconds. When the finishing process is performed for about 5 minutes in this manner, the conical surface of the base material is finished smoothly. The undulation of the conical surface immediately after the glass lathe processing is 5 mm at the maximum (see FIG. 4 (a)), but the finishing processing results in a smooth conical surface having a maximum of 1 mm or less. When this was installed in a drawing furnace and drawing was started at a speed of 10 m / sec, the drawing became stable in about 500 seconds, and the length of the defective fiber during that time was about 5 km (previously 2
Stop at 0 km). This is 1/1 of the length of the defective fiber in the case of drawing the base material without finishing according to the present invention.
Only 4
【０００７】[0007]
【効 果】本発明の前記課題を解決した発明は未だ公
知ではない。したがって、この新規な課題を解決して従
来技術における前記の問題を解消したこと自体が本発明
特有の効果である。すなわち、母材を線引炉に装着して
ガラスファイバの紡糸を開始してから、線引きが安定す
るまでの時間を著しく短縮し、線引きが安定するまでに
線引きされ、廃棄されるガラスファイバの長さを著しく
短縮することができるので、線引炉の稼動効率、線引作
業の能率、母材の歩留まりを著しく向上させることがで
きる。また、仕上加工は従来のガラス旋盤をそのまま用
いて行うことができ、かつ仕上作業は極めて簡単、迅速
に行われる。したがって、円錐こての製作コスト、仕上
加工コストを勘案しても、ガラスファイバの製造コスト
を顕著に低下させることができる。[Effect] The invention which solves the above-mentioned problems of the present invention is not yet known. Therefore, the solution of this novel problem and the solution of the above problems in the prior art is the effect peculiar to the present invention. In other words, the time from the installation of the base material in the drawing furnace to the spinning of the glass fiber to the stabilization of the drawing is significantly shortened, and the length of the glass fiber that is drawn until the drawing is stable and is discarded. Since the length can be remarkably shortened, the working efficiency of the drawing furnace, the efficiency of the drawing work, and the yield of the base material can be significantly improved. Further, the finishing process can be performed by using the conventional glass lathe as it is, and the finishing work is extremely simple and quick. Therefore, the manufacturing cost of the glass fiber can be remarkably reduced even in consideration of the manufacturing cost of the conical iron and the finishing cost.
【図１】実施例の要部断面図である。FIG. 1 is a sectional view of an essential part of an embodiment.
【図２】従来のガラス旋盤の正面図である。FIG. 2 is a front view of a conventional glass lathe.
【図３】線引炉の概略図である。FIG. 3 is a schematic view of a drawing furnace.
【図４】母材下部の円錐面の正面図であり、（イ）波打
った円錐面の正面図、（ロ）平滑な円錐面の正面図であ
る。FIG. 4 is a front view of a conical surface at a lower portion of a base material, (a) a front view of a wavy conical surface, and (b) a front view of a smooth conical surface.
１・・・ガラス旋盤 ２・・・上フレーム ３・・・下フレーム ４・・・上部チャック ５・・・下部チャック ６・・・母材 ６ａ・・・ロッド ６Ａ・・・母材下部の波打った円錐面 ６Ｂ・・・母材下部の平滑な円錐面 ７・・・酸水素バーナ ８・・・トラバース機構 １１・・・円錐こて １１ａ・・・ロッド １１ｂ・・・円錐こての基板 １２・・・凹状内面 ２１・・・線引炉 ２２・・・ヒータ ２３・・・ガラスファイバ θ1・・・母材円錐部の円錐角度 θ2・・・円錐こての凹状内面の円錐角度1 ... Glass lathe 2 ... Upper frame 3 ... Lower frame 4 ... Upper chuck 5 ... Lower chuck 6 ... Base material 6a ... Rod 6A ... Base material lower wave Hitted conical surface 6B ... Smooth conical surface under the base material 7 ... Oxyhydrogen burner 8 ... Traverse mechanism 11 ... Conical iron 11a ... Rod 11b ... Conical iron base plate 12 ... Concave inner surface 21 ... Drawing furnace 22 ... Heater 23 ... Glass fiber θ 1 ... Cone angle of base material cone θ 2 ... Cone angle of concave inner surface of conical trowel
Claims (2)
スファイバ紡糸用母材を同ガラス旋盤の上部チャックに
把持させ、バーナーによって加熱しながらゆっくりと回
転させ、下部チャックに装着した内面円錐状の円錐こて
を回転させ、かつ上下往復動させて、円錐こての円錐状
内面を母材先端の円錐面に繰り返し当接させて同円錐面
を平滑に仕上加工する母材先端の加工方法。1. A conical cone having an inner surface which is attached to a lower chuck by causing a glass lathe preform, which has been subjected to glass lathe processing with a burner, to be gripped by an upper chuck of the glass lathe and slowly rotated while being heated by a burner. A method for machining a base metal tip, in which a trowel is rotated and reciprocally moved up and down so that the conical inner surface of a conical trowel is repeatedly brought into contact with the conical surface of the base metal tip to smoothly finish the conical surface.
の上端を把持する上部チャックと、円錐こてを把持し、
かつ上下に往復動する下部チャックと、上記母材の下端
円錐面を加熱する上下に往復動するバーナーとを有し、
上記円錐こての円錐状内面を母材先端の円錐面に当接さ
せて同円錐面を平滑に仕上加工する上記母材先端の加工
装置。2. An upper chuck for gripping an upper end of a base material subjected to glass lathing using a burner and a conical trowel,
And a lower chuck that reciprocates up and down, and a burner that reciprocates up and down to heat the lower conical surface of the base material,
An apparatus for processing the tip of a base material, wherein the conical inner surface of the conical iron is brought into contact with the conical surface of the tip of the base material to finish the conical surface smoothly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14576894A JPH07330362A (en) | 1994-06-06 | 1994-06-06 | Method for processing tip of preformed material for spinning glass fiber and apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14576894A JPH07330362A (en) | 1994-06-06 | 1994-06-06 | Method for processing tip of preformed material for spinning glass fiber and apparatus therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07330362A true JPH07330362A (en) | 1995-12-19 |
Family
ID=15392720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14576894A Pending JPH07330362A (en) | 1994-06-06 | 1994-06-06 | Method for processing tip of preformed material for spinning glass fiber and apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07330362A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000059838A1 (en) * | 1999-03-30 | 2000-10-12 | Corning Incorporated | Method and apparatus for the thermal treatment of an object such as an optical fiber preform |
| NL1014374C2 (en) * | 2000-02-14 | 2001-08-15 | Draka Fibre Technology Bv | Rod-shaped molded part for manufacturing an optical fiber therefrom, method for manufacturing such a rod-shaped molded part, and method for manufacturing an optical fiber using such a rod-shaped molded part. |
| WO2002008129A1 (en) * | 2000-07-26 | 2002-01-31 | Heraeus Tenevo Ag | Method for the vitrification of a porous soot body |
| WO2002028789A1 (en) * | 2000-09-29 | 2002-04-11 | Corning Incorporated | Method and apparatus for reshaping the draw end of an optical fiber preform |
| US11618708B2 (en) | 2016-05-03 | 2023-04-04 | Heraeus Quartz North America Llc | Elongation method and preform for producing an optical glass component |
| US11649185B2 (en) | 2019-01-15 | 2023-05-16 | Heraeus Quartz North America Llc | Automated large outside diameter preform tipping process and resulting glass preforms |
-
1994
- 1994-06-06 JP JP14576894A patent/JPH07330362A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000059838A1 (en) * | 1999-03-30 | 2000-10-12 | Corning Incorporated | Method and apparatus for the thermal treatment of an object such as an optical fiber preform |
| JP2002541045A (en) * | 1999-03-30 | 2002-12-03 | コーニング インコーポレイティッド | Method and apparatus for heat treatment of objects such as optical fiber preforms |
| NL1014374C2 (en) * | 2000-02-14 | 2001-08-15 | Draka Fibre Technology Bv | Rod-shaped molded part for manufacturing an optical fiber therefrom, method for manufacturing such a rod-shaped molded part, and method for manufacturing an optical fiber using such a rod-shaped molded part. |
| WO2001058819A1 (en) * | 2000-02-14 | 2001-08-16 | Draka Fibre Technology B.V. | Rod-shaped preform for manufacturing an optical fibre and methods of producing the preform and the fibre |
| US6649261B2 (en) | 2000-02-14 | 2003-11-18 | Draka Fibre Technology B.V. | Rod-shaped preform for manufacturing an optical fiber therefrom, a method for manufacturing such a rod-shaped preform as well as a method for manufacturing an optical fiber, using such a rod-shaped preform |
| WO2002008129A1 (en) * | 2000-07-26 | 2002-01-31 | Heraeus Tenevo Ag | Method for the vitrification of a porous soot body |
| WO2002028789A1 (en) * | 2000-09-29 | 2002-04-11 | Corning Incorporated | Method and apparatus for reshaping the draw end of an optical fiber preform |
| US11618708B2 (en) | 2016-05-03 | 2023-04-04 | Heraeus Quartz North America Llc | Elongation method and preform for producing an optical glass component |
| US11840472B2 (en) | 2016-05-03 | 2023-12-12 | Heraeus Quartz North America Llc | Elongation method and preform for producing an optical glass component |
| US11649185B2 (en) | 2019-01-15 | 2023-05-16 | Heraeus Quartz North America Llc | Automated large outside diameter preform tipping process and resulting glass preforms |
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