| 摘要 |
1313106 Drawing glass rods and fibres PILKINGTON BROS Ltd A M REID D W HARPER and A FORBER 1 Oct 1970 [14 Oct 1969] 50543/69 Heading C1M Clad glass rods or fibres are produced by supporting within a single container 11b or 11a a layer of molten glass 14 overlying a layer of molten glass 13, each layer being provided by a quiescent pool, and drawing from the free surface of the upper layer (14) a glass rod or fibre comprising an outer cladding 19 of glass 14 on a core 18 of glass 13 which is entrained at the interface between the layers, the rod or fibre being stabilized at the required thickness by cooling. Fresh glass may be introduced to the pools intermittently or as in Fig. 2, continuously, through inlets 21, 20 in container llb and pipes 23, 22 extending out through the furnace walls 12, the rate of feed being controlled according to the rate of drawing of each layer. Alternatively, to maintain the depth of the upper pool constant, the container 11a (to be used in a furnace 12) is of circular crosssection and curved downwardly. Examples of core and cladding glasses are given of differing refractive indices for fibre optics. |
