| 摘要 |
629,110. Extrusion presses. SOC. P. A. LAVORAZIONE MATERIE PLASTICHE. May 2, 1946, No. 13330. Convention date, April 30, 1943. [Class 87 (ii)] [Also in Groups XXVI and XXX] An extrusion press comprises three or more screws, the threads of each of which mesh with the threads of at least two other screws. A modification with seven screws is shown. In Fig. 5 some of the screws 3 are shorter and the material fed by them is conveyed to the nozzle 6 by the longer screws 2. The screws may be in sections of progressively decreasing pitch and diameter as in Specification 629,109.
|
