| 摘要 |
<p>The apparatus comprises a collecting block (1) for the different plastics streams which are to form the layers, a reforming unit (2), and a wide-slit nozzle (3) through which the laminated plastics ribbon emerges, the block (1) having a collecting channel (4) for the streams of plastics from different worm extruders. The channel (4) has a substantially rectangular cross-section with corner fillets (5) and is connected at its upstream end to a coaxially feed channel (6) from a first plastics worm extruder, and at least one entry channel (7) connected to another plastics worm extruder is disposed downstream of the feed channel (6) and extends over one side (15) of the channel (4). A flow control pin (10) is rotatably disposed in a cylindrical hole (9) opening in to the path of the entry channel (7), and projects into and extends across the entry channel, and has a variable profile (Fig. 3 not shown) around its periphery so that the entry channel section (7) can be adjusted upon rotation of the pin (14). <IMAGE></p> |
