| 摘要 |
1,141,569. Coated wire. SIEMENS A.G. 12 Sept., 1967 [13 Sept., 1966], No. 41548/67. Addition to 1063899. Heading B2K. A process for coating an electrically conductive member with a thermoplastic synthetic resin comprises (a) drawing the member through a thixotropic dispersion of the thermoplastic synthetic resin in a liquid containing a forming agent, the viscosity of the dispersion in the region where the member emerges from the dispersion being reduced mechanically, to deposit on the member a covering of the thermoplastic synthetic resin, (b) heating the covered member to drive off said liquid and to sinter and fuse the thermoplastic synthetic resin into a homogeneous foamed coating, and (c) forming a coating of an unfoamed thermoplastic synthetic resin on said homogenous foamed coating. The coating of unfoamed thermoplastic synthetic resin may also be formed by drying the member through a dispersion of a thermoplastic synthetic resin in a liquid not containing a foaming agent in the same way as the formed coating is applied. The thickness of the final coating may be from 1/3 to 1/5 of the total wall thickness of the insulation. The coatings may be applied as a continuous operation. The electricallyconductive member may be a wire and the thermoplastic synthetic resin may be polyethylene. |
