Fire-resistant drop optical cable and manufacturing method thereof

Abstract

The invention relates to a fire-resistant drop optical cable and a manufacturing method thereof. The cable comprises optical fibers, reinforcing parts, an inner sheath with a butterfly-shaped cross section, auxiliary reinforcing parts, a water blocking layer, an isolating layer, a fireproof layer and a flame-retardant outer protecting layer. The inner sheath with a butterfly-shaped cross section wraps the optical fibers located at the center of the butterfly-shaped cross section. The two reinforcing parts which are symmetrical relative to the optical fibers are embedded into the butterfly-shaped cross section; two symmetrical open grooves are formed in two sides of the inner sheath respectively; and the two auxiliary reinforcing parts are symmetrically arranged in the two open grooves respectively and then are wrapped with the water-blocking layer, the isolating layer, the fireproof layer and the flame-retardant outer protective layer sequentially. The optical cable disclosed by the invention has excellent flame retardancy and fireproof performance; a ceramic hard complete shell which is rapidly formed after the optical cable is combusted by high-temperature flames can realize a good fireproof and thermal insulation protection effect for the optical cable line, so that the communication smoothness of the optical cable line under a fire condition is guaranteed; and the optical fibers in the optical cable are located at the center of the two reinforcing parts and the two auxiliary reinforcing parts, so that the optical cable has excellent side pressure resistance and tensileperformance, and is suitable for the connection of building pipelines or overhead devices.

Description

technical field [0001] The invention relates to the technical field of optical cable manufacturing, in particular to a fire-resistant lead-in optical cable. Background technique [0002] As the society pays more attention to fire safety and hidden dangers, it will inevitably put forward higher requirements for the flame-retardant and fire-resistant performance of optical cables. In the event of a fire, the flammable cables in the indoor confined space will become the biggest accomplice to the spread of the fire, and at the same time generate a large amount of thick smoke, making it a big problem to judge the fire source and quickly extinguish the fire. As a large-scale optical fiber cable used in the user drop-in section of FTTX network, the drop cable has the characteristics of small diameter and light weight, and is widely used in the connection of building pipelines, overhead or other optical devices. However, because the flame-retardant sheath is difficult to achieve th...

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Problems solved by technology

However, because the flame-retardant sheath is difficult to achieve the effect of fire prevention under high-temperature flames, the integrity of the optical cable line is damaged, which in turn leads to communication interruption of the optical cable line in the event of a fire.

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