| 摘要 |
1,133,603. Cables. GENERAL CABLE CORP. 15 NQV., 1965 [22 Jan., 1965], No. 48391/65. Heading H1A. In a shielded electric cable plastics sheathing 13 adheres strongly to the periphery of tubular metal shield 12 within the strip between A and B which includes the overlap of the shield and has a controlled lesser adhesion to the rest of the periphery, indicated by 15, to facilitate stripping the plastic from the shield in regions removed from the overlap. To achieve this the strip of metal, prior to being folded round the insulated conductors 11, is coated with a strongly adhesive copolymer of ethylene with a monomer containing carboxyl groups and a region of lesser adhesion is produced by heating with preferably an oxidizing flame. Alternatively, only the outer edges of the strip are coated with the strong adhesive and the centre is coated with a polyethylene of lesser adhesion. In another method the strip coated with strong adhesive is wrapped round the conductors and before the polyethylene sheath 13 is extruded, a release agent such as talc or a silicone is applied to the region requiring lesser adhesion. Reference has been directed by the Comptroller to Specification 977,038. |
