CN200950366Y - Foam filling member for cable rope having external coatings - Google Patents

Abstract

A foam stuffing for an optical fiber cable with an outer covering includes a cable core and two orderly-arranged layers consisting of a foaming layer and a protection layer, wherein, the foam stuffing has a soft surface and can be twisted with other components; the foaming layer can be protected by the protection layer at the time of twisting, thereby ensuring the circularity of the cable core and the optical fiber cable further; the employment of foaming layer can save the consumption of raw materials and reduce the manufacturing cost; also the cable core within the foam stuffing improves the tensile strength of the optical fiber cable.

Description

A kind of foamable filling up piece in use for optical cable with surrounding layer

Technical field

The utility model relates to a kind of filling member in the optical cable, especially with foam filled of surrounding layer.

Background technology

The optical cable filling member is to fill up room in the cable core to make it keep a kind of element of rounding in the stranded process of cable core, existing optical cable is generally the solid filling member that the high density Insulation Material is extruded with filling member, because hardness height, easily make the cable core distortion when filling member and other element twist altogether in the stranded process of cable core, influence the roundness of optical cable.

Summary of the invention

In order to overcome the deficiency that existing optical cable filling member exists, the utility model provides a kind of foamable filling up piece in use for optical cable with surrounding layer, easily makes cable core keep rounding when twisting altogether with other element in making the cable core process, can not influence the roundness of optical cable.

A kind of foamable filling up piece in use for optical cable with surrounding layer that the utility model provides has heart yearn, is surrounded by foaming layer outside heart yearn, coats sheath outside foaming layer.

The beneficial effects of the utility model are: owing to establish heart yearn outsourcing foaming layer and sheath in the filling member, the surface is softer, sheath when twisting altogether with other elements outside the foaming layer can be protected foaming layer again, thereby easily makes cable core keep rounding, thereby has guaranteed the roundness of optical cable; Adopt foaming layer can save material, reduce production costs; Heart yearn in the filling member has also increased the tensile strength of optical cable.

Description of drawings

Fig. 1 is a cross sectional representation of the present utility model.

In Fig. 1,1, heart yearn, 2, foaming layer, 3, sheath.

Embodiment

In Fig. 1, high density polyethylene (HDPE) base resin with 98～99% is a base-material, the nucleator that adds 1-2% mixes back fusion refining and is one, under 165-185 ℃ of temperature, extrude formation foaming layer (2) with the glass yarn at a high speed as heart yearn (1), foam degrees is 60-70%, adopts poly-to benzene fourth dioctyl phthalate butanediol ester or polyethylene coating sheath (3) again outside foaming layer (2).The nucleator that the utility model adopts is made up of 5% modification azo virtue diamides and 95% low density polyethylene (LDPE).

Claims (1)

1. the foamable filling up piece in use for optical cable with surrounding layer is characterized in that having heart yearn, is surrounded by foaming layer outside heart yearn, coats sheath outside foaming layer.

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