| 摘要 |
The extrusion head comprises a first extrusion outlet surrounding an aperture wherethrough a metal section can be fed and a second extrusion outlet located externally to the first extrusion outlet, the latter being communicated to a first feed branched channel for the plastics material to be extruded, extending substantially perpendicularly to the feed direction of the metal section, while the second extrusion outlet is in turn communicated to a second plastics material branched channel also perpendicularly extending to the feed direction of the metal section and substantially juxtaposed to the first channel.
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