manufacturing process of a steel wire with a layer of a plastic material coated on a stranded wire

摘要

1458086 Making wire ropes DRAHTSEILWERK SAAR GmbH 9 April 1974 [25 May 1973] 15631/74 Heading D1T A wire rope having inner and outer stranded layers is made by using sheathed strands 11 for the inner layer, the strands 12 of the outer layer being twisted parallel with the strands of the inner layer, the sheathing material 16 of the strands 11 being heated until it softens and being then squeezed in a twisting mould into the spaces between the strands 11, 12 so as to form a coherent embedment for the inner and outer layers. In Fig. 1 the strands 12 and the sheathed strands 11 are drawn from a rotating basket, through a twisting template 4 and a heat shield 5, the shield 5 carrying induction coils 6. The coils 6 heat the strands 11 from within. Alternatively an annular gas burner 8 acts on the strands before they enter a die 7. Infra-red heating may also be used.