| 摘要 |
<p>An extruder for continuously manufacturing reinforced fluid-impermeable tubing, especially hose, mainly comprises an elongated extruder head formed from an inner, an intermediate and an outer tubular member arranged concentric with each other and constructed to define between the inner and the intermediate tubular members a first annular passage having an outlet end communicating at an opposite end thereof with a first hopper, and to define between the intermediate and the outer tubular member a second annular passage communicating with a second hopper. A mandrel concentric with the inner tubular member forms a gap with the latter through which a tubular reinforcing fabric is guided. The mandrel is provided with an annular neck which overlaps at least partly the outlet end of the first annular passage; which is rearwardly displaced from the outlet end of the second annular passage so that compounded polymeric material passing from the first hopper to the outlet end of the first annular passage may pass through a portion of the tubular fabric reinforcement not yet covered at its outer surface to form an inner layer of the reinforced tubing, while the material passing from the second hopper to the outlet end of the second annular passage will form the outer layer of the reinforced tubing.</p> |
