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US 6,640,033 B2Granted
Dual-layer fire retardant structure with air gap
AssigneeAlcatel
InventorsThierry Auvray, Nicholas Nechitailo
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Abstract
The cable according the present invention has at least two layers of thermally conductive tape wrapped around a center cable core, where a layer of flame-retardant yarn is placed between the layers of tape such that air gaps are created. Further, in the present invention, a powder having a low thermal conductivity is placed in the air gaps to further retard flame penetration and smoke generation. The thermally conductive tape of the present invention can be made from either Mica tape, or metallic foil and is wound helically along the length of the cable.
Claims38
A fiber optic cable, comprising:
- a center core;
- at least a first and second layer of tape, wherein said first layer is wrapped around said center core;
- and
- at least one yarn wrapped around said first layer and positioned between said first layer and said second layer so as to create air gaps between said first and second layers of said tape,
- wherein said air gaps contain a powder having low thermal conductivity.
2 more elements
A fiber optic cable, comprising:
- a center core;
- at least a first and second layer of tape, wherein said first layer is wrapped around said center core;
- and
- at least one yarn wrapped around said first layer and positioned between said first layer and said second layer so as to create air gaps between said first and second layers of said tape,
- wherein said tape has a thickness in the range of 0.05 to 0.4 mm.
2 more elements
Dependencies are inferred from the claim text.