초록 ▼

A device for processing material by mixing and/or plasticization or agglomeration has a screw housing, in which at least two screws are situated adjacent to one another. The screw channels are engaged with one another. The screws are driven to rotate by at least one motor. The screws are supplied wi

A device for processing material by mixing and/or plasticization or agglomeration has a screw housing, in which at least two screws are situated adjacent to one another. The screw channels are engaged with one another. The screws are driven to rotate by at least one motor. The screws are supplied with the material through an intake opening of the screw housing and the processed material leaves the screw housing through at least one outlet opening. An apparatus is provided, which in operation of the device provides the gap which exists between adjacent screw channels of the screws alternately with a periodic enlargement or reduction, which is superimposed on the rotational movements of the two screws. In the method for material processing, the material, in addition to the compaction which is caused by the conveyance action of the screws, is subjected to periodic squeezing by the screws.

대표청구항 ▼

The invention claimed is: 1. A device for mixing and/or plasticizing plastic material, having at least two screws situated adjacent to one another in a shared screw housing, whose screw channels are engaged with one another and are driven to rotate around the particular screw axis by at least one m

The invention claimed is: 1. A device for mixing and/or plasticizing plastic material, having at least two screws situated adjacent to one another in a shared screw housing, whose screw channels are engaged with one another and are driven to rotate around the particular screw axis by at least one motor, the material to be processed being supplied to the screws through at least one intake opening of the screw housing situated in the area of one front end of the screws and the material processed by the screws leaving the screw housing through at least one outlet opening of the screw housing situated in the area of the other front end of the screws, whereby a mechanism is provided, which alternately imparts a periodic enlargement or reduction in size of the gap that exists between screw channels of the screws that are adjacent to one another, which enlargement or reduction in size is superimposed on the rotational movements of the screw channels (7) of the screws (1, 2), wherein the two screws (1, 2) are components of a twin-screw extruder (38) having conical screws (1, 2) that engage into one another with their screw channels, without making contact, which are driven in the same rotational direction. 2. The device according to claim 1, wherein the apparatus (19) for one (1) of the screws (1, 2) has a universal shaft (26) for the rotational drive of this screw (1), this universal shaft (26) having two Cardan joints (20, 21) connected to one another rotationally fixed, one of which is connected rotationally fixed on its drive side to a driveshaft (13) driven by the motor (3), while in contrast the other Cardan joint (21) is connected rotationally fixed on its output side to an output shaft (22) connected rotationally fixed to the screw (1), the axial direction of the output shaft (22) deviating from the axial direction of the drive shaft (13) and/or the two Cardan joints (20, 21) being pivoted in relation to one another around the axis (24) connecting them. 3. The device according to claim 2, wherein the axial direction of the output shaft (22) is adjustably changeable in relation to the axial direction of the drive shaft (13). 4. The device according to claim 2, wherein the rotationally fixed connection of the two Cardan joints (20, 21) of the universal shaft (26) has a coupling (27), using which the rotational position of one Cardan joint (20) is adjustably changeable in relation to the other Cardan joint (21). 5. The device according to claim 4, wherein the coupling (27) has a receptacle (28) connected rotationally fixed to one Cardan joint (20), which is provided with internal teeth (29), into which receptacle (28) a socket pin (31) connected rotationally fixed to the other Cardan joint (21) is insertable, which has external teeth (30) fitting in the internal teeth (29) on its circumference. 6. The device according to claim 1, wherein the apparatus (19) drives the screws (1, 2) differently for the rotational movement, one screw (2) being driven at constant speed, while in contrast another screw (1) is driven using a periodic acceleration and/or deceleration superimposed on the constant speed. 7. The device according to claim 6, wherein the dimension of the periodic acceleration and/or deceleration is adjustably changeable. 8. The device according to claim 1, wherein the apparatus (19) provides a limited displaceability of one screw (1) in its axial direction in the screw housing (6), and an additional drive is provided for this screw (1), which provides the screw (1) with a periodic back and forth displacement in the axial direction superimposed on its rotation. 9. The device according to claim 8, wherein the additional drive is formed by a piston-cylinder assembly causing the periodic back-and-forth movement of the screw. 10. The device according to claim 1, wherein the periodic change of the gap (8) is 40 to 60%, in particular approximately 50% of the maximum possible gap width. 11. The device according to claim 1, wherein to achieve a leakage flow, the tips of at least some screw channels are flattened and/or grooves are provided on at least some flanks of the screw channels.