초록 ▼

An elongated metallic conductor is insulated with an inner layer of a plasticized polyvinyl chloride composition and an outer layer of a plasticized, irradiation cross-linked polyvinyl chloride composition. The outer layer has a low coefficient of friction to facilitate pulling in central office rac

An elongated metallic conductor is insulated with an inner layer of a plasticized polyvinyl chloride composition and an outer layer of a plasticized, irradiation cross-linked polyvinyl chloride composition. The outer layer has a low coefficient of friction to facilitate pulling in central office racks, has mechanical properties which are required for installation and use and, in a preferred embodiment, has a thickness which is substantially less than that of the inner layer. The layers are extruded in the same extruder crosshead that seemingly causes the outer layer to bond to the inner layer to facilitate stripping of the composite insulation from the conductor.

대표청구항 ▼

A method of compositely insulating an elongated metallic conductor, said method including the steps of: advancing the elongated metallic conductor; covering the conductor with a first layer of plastic material which comprises a plasticized polyvinyl chloride composition and which is applied to the c

A method of compositely insulating an elongated metallic conductor, said method including the steps of: advancing the elongated metallic conductor; covering the conductor with a first layer of plastic material which comprises a plasticized polyvinyl chloride composition and which is applied to the conductor in an extrusion crosshead; covering the first layer with a second layer of plastic material comprising an irradiation cross-linkable, plasticized polyvinyl chloride composition and having a thickness that is substantially less than that of the first layer, the second layer being applied by the extrusion crosshead and having an adhesion to the first layer which is greater than that of the first layer to the conductor and which is sufficient to cause any elongation of the adhered layers to be substantially unitary; irradiation cross-linking the second layer of plastic material; and taking up the elongated metallic conductor which is enclosed by the first layer of plastic material and the irradiation cross-linked second layer of plastic material.