| 摘要 |
The longitudinal leaktightness of a telecommunications cable (which contains, from the core to the periphery, at least one bundle of insulated conductors 1, 2, 3, 4 coated with a hydrophobic filling substance 5, a sleeve 6, a metal screen 7 and an external sheath 9) is achieved by a powder which swells in water, dispersed in a viscous agent which does not adversely affect its swelling capacity, in a layer 10 interposed between the sleeve 6 and the metal screen 7. The powder may be a cellulose derivative and the viscous agent may be polybutene, glycerol or a water-soluble wax. The screen 7 may be of Al tape and the sleeve 6 of non-woven fibres e.g. paper. <IMAGE> |
