| 摘要 |
PROBLEM TO BE SOLVED: To obtain a parallel different speed twin-screw extruder in which the depth of the helical groove of at least one screw facing to a compression cylinder is decreased gradually, and a compression ratio is changed by coupling the base ends of a pair of right and left screws to the shaft of a variable speed gear variable in its gear ratio. SOLUTION: The upper half parts of a pair of right and left mixing cylinders 16 are made to communicate with the outlet of a hopper 50. A pair of right and left compression cylinders 33 communicating with each other at the circumferential wall parts thereof are connected to the leading ends of the cylinders 16, and a heating cylinder 9 is connected to the leading end of one compression cylinder 33. Screws 30 and 10 in which spiral ridges 20c and 30b are formed on the peripheral surfaces of the shafts rotated oppositely are housed in the cylinders 16. The shaft of at least one of the screws 30 and 10 facing to the compression cylinders 33 is made tapered to gradually decrease the depth of the helical groove 10b. In the heating cylinder 9, the depth of the helical groove 10a of the screw 10 is made equal to the minimum depth of the helical groove 10b facing to the compression cylinder 33. The base end parts of the left and right screws 30 and 10 are connected to the shafts of gears 41 and 21 meshed with each other, and one of the shafts is driven rotationally. COPYRIGHT: (C)2004,JPO&NCIPI |
