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AssigneeKitagawa Industries Co., Ltd.
InventorsAkira Ikushima, Kazuya Saito, Takashi Miura, Shogo Nasuda
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A processing method of a silica glass fiber, which is applicable to a long fiber, to improve its UV resistance by UV irradiation and heat treatment. Initially, a heating furnace 1 is positioned such that the left end of the silica glass fiber is within the heating furnace 1. Then, the heating furnace 1 is moved toward the right, while UV is irradiated with a UV source to the left end surface of the silica glass fiber. Since the silica glass becomes transparent due to removal of structural defects that have been caused by the UV irradiation, the UV travels further forward and causes other structural defects there. When the heating furnace 1 is moved there, the structural defects are removed and the silica glass fiber becomes transparent. By repeating these steps, the fiber is processed throughout length. Thus, mass production becomes possible and an improvement of productivity and lower costs can be achieved.
A method of processing a silica glass fiber to improve the UV resistance thereof by purposefully causing multiple structural defects in said silica glass fiber by irradiating said silica glass fiber with UV and removing said structural defects by heating, said method comprising the steps of:
A method of processing a silica glass fiber to decrease resistance to transmission of ultraviolet radiation through the fiber comprising the steps of:
Dependencies are inferred from the claim text.