| 摘要 |
1,159,547. Coating conductors by extrusion. UNION CARBIDE CORP. 25 Nov., 1966 [26 Nov., 1965], No. 52891/66. Addition to 1,082,132. Heading B5A. [Also in Division H1] An insulated electrical conductor of the type described in the parent Specification in which a conductive core of sodium, potassium, lithium, caesium, rubidium, or an alloy of one or more of these is surrounded by a non- reactive olefin polymer, is provided with an outer layer 14 of reactive polymeric material. The inner layer of non-reactive resin, such as polyethylene, polypropylene, polyneohexene, or ethylene-neohexene copolymer, is extruded from extruder 20 through an inner annular orifice in a cross-head die 22 at 150‹ C. to form an extruded tube around a core of sodium, for example, and the outer layer of reactive polymeric resin such as inert polymers to which reactive additives have been added, reactive thermoplastic cross-linkable olefin polymer compositions containing cross-linking agents, plasticized polyvinyl chloride, or vulcanizable natural or synthetic rubber, is fed from extruder 21 through an outer annular orifice in the crosshead die at 165‹ C. The sodium is fed from tank 24 at 160‹ C., blanketed by inert gas, through the circular central orifice of the crosshead die. The take off speed is 106 cm./min. The resins and sodium are extruded simultaneously.
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