Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1990-09-24
1993-02-09
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 2, 65 32, 65 605, 65102, 65DIG16, C03B 37023
Patent
active
051850214
ABSTRACT:
In a method of manufacturing a preform for a nonoxide glass fiber, cladding and core glass materials are placed in a cylinder of an extrusion apparatus such that ground end faces of the respective cladding and core glass materials are in contact with each other and such that the cladding glass material is located adjacent a molding section of the extrusion apparatus. The cladding and core glass materials are heated within inert-gas atmosphere, to their respective temperatures equal to or below their respective sag points and equal to or above their respective crystallization start temperatures. An extrusion punch of the extrusion apparatus is pushed within the atmosphere, to extrude the cladding and core glass materials through a molding nozzle in the molding section while the cladding and core glass materials are in fusible contact with each other, thereby forming the preform of a core and cladding structure. The preform is gradually cooled within a liner connected to the molding section within the atmosphere. Alternatively, an over-cladding glass material may be placed in the cylinder such that the over-cladding material is located adjacent the molding section, and the cladding glass material is located between the over-cladding and core glass materials.
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Miura Kiyotaka
Yamashita Toshiharu
Hoya Corporation
Lindsay Robert L.
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