| 摘要 |
<p>Tubes made of transparent plastics having a very good surface quality are produced using the inventive method and the device used therewith, which consists of a calibrating sleeve (1) and a water ring nozzle (2) made of a brass alloy containing: 89 to 95 % by weight of Cu; 0.3 to 0.7 % by weight of Zn; 0.4 to 2 % by weight of Pb; 10 to 13 % by weight of Sn, and; 0.3 to 0.7 % by weight of Ni.</p> |
