| 摘要 |
PURPOSE:To pour the 2nd sol closely into the gelatinized matter of the 1st sol in a manner as to avoid generation of foam by pouring the 2nd sol under a reduced pressure into the 1st sol which gels to a tubular shape in a cylindrical vessel to gel the same. CONSTITUTION:The gelation is executed while the system for pouring the 2nd sol is maintained under a reduced pressure in a method for manufacturing a fiber made into two-layered structure having a refractive index distribution by gelatinizing the 2nd sol in the 1st sol which gels to the tubular shape in the cylindrical vessel. The wet gel of the form in which a hole is not bored in the central part is manufactured in the above-mentioned method particularly in the case of gelatinizing the 1st sol while rotating the same, then pouring the 2nd sol. The yield up to the final stage and the quality are remarkably improved. |
