| 摘要 |
A continuous coating of hardenable material, e.g. a thermosetting enamel, is applied to an advancing optical fibre by causing the fibre to pass between two continuously moving endless surfaces, e.g. two rollers, which are positioned on opposite sides of the advancing fibre and each of which carries a layer of liquefied hardenable material in such a way that the advancing fibre is at least partially immersed in each of said layers, the distance that each endless surface is spaced from the advancing optical fibre and the thickness of the layer of hardenable material on each endless surface being such that opposite parts of the advancing fibre pass through said layers of hardenable material with substantially no physical contact taking place between the fibre and the endless sufaces themselves. The endless surfaces are driven in such a direction and at such a speed having regard to the direction and speed of the advancing fibre that liquefied hardenable material is transferred from the moving endless surfaces to the advancing fibre to form on the fibre a continuous coating of substantially uniform thickness.
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