| 摘要 |
1,123,069. Extrusion-moulding nets. TREFILERIES LEON BEKAERT P.V.B.A. 9 Nov., 1966 [17 Nov., 1965], No. 48871/65. Heading B5A. [Also in Division El] An extruded net-like barrier fence comprises warp strands 21, Fig. 4, of wire 9, e.g. steel wire, covered with synthetic plastics material, e.g. polyethylene or PVC, and weft strands of plastics material only. Various configurations are described, Figs. 3, 5 and 6 (not shown), with the main structural difference being the provision of wire reinforcement in some only of the warp strands, e.g. the boundary warp strands (22), Fig. 6 (not shown). Specific uses mentioned for the fencing are as an anti-dazzle barrier or for enclosing tennis courts. The warp and weft may have any desired cross-sectional shape. As an example, an anti-dazzle barrier might have warp strands of circular orosssection and weft strands of an elongated diamond cross-section. Apparatus for making the fencing comprises a screw-impeller (5), Fig. 1 (not shown), which forces plasticized material around wire guide tubes 8, Fig. 2, into the nip between a pair of co-operating grooved rollers 3, (4). Wires 9 pass through the extrusion orifices formed by mating circumferential grooves 7, and are there coated with the plastics material, and the weft strands are formed by flow of the plastics material along mating grooves 11. Only one of rollers 3, (4) may be grooved to form the weft strands.
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