A twin-screw extruder is provided in which screws have different rotational speeds depending on the process of treating the raw material and in which degradation of the raw material is less likely to occur. Twin-screw extruder 1 has two screws 3, 5 that extend in parallel to each other. Each screw 3, 5 has cylindrical upstream screw 31 and downstream screw 35, wherein upstream screw 31 has shaft hole 315 that extends in longitudinal direction X and screw flight 316 on an outer circumferential surface thereof, and downstream screw 35 includes large diameter portion 353 having screw flight 357 on an outer circumferential surface thereof and small diameter shaft portion 351 that has a smaller diameter than large diameter portion 353, wherein small diameter shaft portion 351 of downstream screw 35 is inserted into shaft hole 315 of upstream screw 31. Upstream screw 31 and downstream screw 35 can be independently rotated. Twin-screw extruder 1 further includes upstream rotating mechanism 84 that rotates upstream screws 31 of two screws 3, 5, and downstream rotating mechanism 83 that rotates downstream screws 35 of two screws 3, 5.

A twin-screw extruder is provided in which screws have different rotational speeds depending on the process of treating the raw material and in which degradation of the raw material is less likely to occur.

Twin-screw extruder 1 has two screws 3, 5 that extend in parallel to each other. Each screw 3, 5 has cylindrical upstream screw 31 and downstream screw 35, wherein upstream screw 31 has shaft hole 315 that extends in longitudinal direction X and screw flight 316 on an outer circumferential surface thereof, and downstream screw 35 includes large diameter portion 353 having screw flight 357 on an outer circumferential surface thereof and small diameter shaft portion 351 that has a smaller diameter than large diameter portion 353, wherein small diameter shaft portion 351 of downstream screw 35 is inserted into shaft hole 315 of upstream screw 31. Upstream screw 31 and downstream screw 35 can be independently rotated. Twin-screw extruder 1 further includes upstream rotating mechanism 84 that rotates upstream screws 31 of two screws 3, 5, and downstream rotating mechanism 83 that rotates downstream screws 35 of two screws 3, 5.

A system for fabricating an object includes an extruder for one or more deposition materials having at least one nozzle and a movable support for the nozzle. The nozzle has a nozzle axis and is rotatably attached to the movable support via a connector that is actuatable relative to the movable support to change an angular orientation of the nozzle axis, thus varying an angle between the nozzle axis and a deposition surface. The system also includes a controller that can apply a correction factor calculated for a path of the nozzle when an acute angle is formed between the nozzle axis and the deposition surface, the correction factor for moving toward the acute angle being different from that when moving away from it. The correction factor removes differences in thickness of the deposited material caused by variations in the angle formed between the nozzle axis and the deposition surface.

An extruder for making meat analogue products, where the extruder comprises a product outlet (22), and a longitudinal barrel (8) comprising an inner surface (14) and an outer surface, and where the extruder further comprises heating means for heating at least a part of said inner surface, where said barrel (8) interconnects with said product inlet (5) and outlet (22), where the extruder further comprises a rotor (16) arranged coaxially inside said barrel (8), where said rotor (16) comprises drive means (19) for rotating said rotor (16) in relation to the barrel (8).

A system for fabricating an object includes an extruder for one or more deposition materials having at least one nozzle and a movable support for the nozzle. The nozzle has a nozzle axis and is rotatably attached to the movable support via a connector that is actuatable relative to the movable support to change an angular orientation of the nozzle axis, thus varying an angle between the nozzle axis and a deposition surface. The system also includes a controller that can apply a correction factor calculated for a path of the nozzle when an acute angle is formed between the nozzle axis and the deposition surface, the correction factor for moving toward the acute angle being different from that when moving away from it. The correction factor removes differences in thickness of the deposited material caused by variations in the angle formed between the nozzle axis and the deposition surface.

A system for fabricating an object includes an extruder for one or more deposition materials having at least one nozzle and a movable support for the nozzle. The nozzle has a nozzle axis and is rotatably attached to the movable support via a connector that is actuatable relative to the movable support to change an angular orientation of the nozzle axis, thus varying an angle between the nozzle axis and a deposition surface. The system also includes a controller that can apply a correction factor calculated for a path of the nozzle when an acute angle is formed between the nozzle axis and the deposition surface, the correction factor for moving toward the acute angle being different from that when moving away from it. The correction factor removes differences in thickness of the deposited material caused by variations in the angle formed between the nozzle axis and the deposition surface.