| 摘要 |
620,684. Extrusion screw presses. SOC. p. A. LAVORAZIONE MATERIE PLASTICHE. May 2, 1946, No. 13331. Convention date, May 6, 1943. [Class 87 (ii)] [Also in Groups XXVI and XXX] A screw press comprises two or more screws with intermeshing threads 3 the outer diameter of which decreases and the diameter of the screw core 4 increases to the same extent towards the outer the screws rotating in the same direction. The pitch of the screws may decrease towards the outlet. The thread may be trapezoidal or square in section.
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