Methods of and apparatus for making coated optical fiber

Details Methods of and apparatus for making coated optical fiber Methods of and apparatus for making coated optical fiber

1990-03-09

1991-03-19

Schor, Kenneth M.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 34, 65 343, 427 47, 427 541, 427163, 4274071, C03B 3702, C03C 2502

Patent

active

050007726

ABSTRACT:
In the manufacture of coated optical fiber, fiber (21) is drawn from a preform (22) and coated with one or preferably two layers (42,44) of light curable coating materials. Afterwards, the coating materials are cured. Increases in manufacturing line speed may be achieved if the cure speed of the coating materials is increased. This is accomplished by the simultaneous application of a magnetic field during irradiation of the curable coating materials to enhance the crosslinking of the coating materials by a free radical polymerization mechanism. Upon absorption of light, a photoinitiator in each composition cleaves to produce two free radical fragments in the spin paired or singlet state. The magnetic field has the effect of enhancing the production of spin parallel radicals which enhances the polymerization initiation of the coating material, thereby allowing an increase in the manufacturing line speed through drawing and coating apparatus.

REFERENCES:
patent: 4448657 (1984-05-01), Turro
patent: 4932750 (1990-06-01), Ansel
Schlef; Conference: Proceedings of the 28th International Wire & Cable Symposium, Cherry Hill, N.J.; Nov. 13-15, 1979; UV Cured Resin Coating for Optical Fiber/Cable; C. L. Shlef, P. L. Narasimham, S. M. Oh; pp. 327-332.
H. Morita et al., vol. 38, Journal of Applied Polymer Science, pp. 1997-2007, (1989).

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