A twin-screw extrusion device is disclosed, which includes a barrel and a twin-screw mechanism, the twin-screw mechanism includes a first screw, a second screw and a drive assembly, the drive assembly includes a plurality of idler gears and two mutually engaged elliptical gears, one of the elliptical gears is fixedly connected to the first screw, the other elliptical gear synchronously rotates with one of the idler gears, the last idler gear is fixedly connected to the second screw, a rotation speed of the first screw is .sub.1=N, an eccentricity of each of the elliptical gears is k, 0<k<0.8, an included angle between a connecting line of the first screw and the second screw and a long axis of each of the elliptical gears is , and a rotation speed of the second screw is .sub.2, satisfying

[00001]${}_2=\frac{\left(1-k^2\right)N}{1-2k\cos +k^2}.$

A twin-screw extrusion device is disclosed, which includes a barrel and a twin-screw mechanism, the twin-screw mechanism includes a first screw, a second screw and a drive assembly, the drive assembly includes a plurality of idler gears and two mutually engaged elliptical gears, one of the elliptical gears is fixedly connected to the first screw, the other elliptical gear synchronously rotates with one of the idler gears, the last idler gear is fixedly connected to the second screw, a rotation speed of the first screw is .sub.1=N, an eccentricity of each of the elliptical gears is k, 0<k<0.8, an included angle between a connecting line of the first screw and the second screw and a long axis of each of the elliptical gears is , and a rotation speed of the second screw is .sub.2, satisfying

[00001]${}_2=\frac{\left(1-k^2\right)N}{1-2k\cos +k^2}.$

A twin-screw extrusion device is disclosed, which includes a barrel and a twin-screw mechanism, the twin-screw mechanism includes a first screw, a second screw and a drive assembly, the drive assembly includes a plurality of idler gears and two mutually engaged elliptical gears, one of the elliptical gears is fixedly connected to the first screw, the other elliptical gear synchronously rotates with one of the idler gears, the last idler gear is fixedly connected to the second screw, a rotation speed of the first screw is .sub.1=N, an eccentricity of each of the elliptical gears is k, 0<k<0.8, an included angle between a connecting line of the first screw and the second screw and a long axis of each of the elliptical gears is , and a rotation speed of the second screw is .sub.2, satisfying ${}_2=\frac{\left(1-k^2\right)N}{1-2k\cos +k^2}.$

A twin-screw extrusion device is disclosed, which includes a barrel and a twin-screw mechanism, the twin-screw mechanism includes a first screw, a second screw and a drive assembly, the drive assembly includes a plurality of idler gears and two mutually engaged elliptical gears, one of the elliptical gears is fixedly connected to the first screw, the other elliptical gear synchronously rotates with one of the idler gears, the last idler gear is fixedly connected to the second screw, a rotation speed of the first screw is .sub.1=N, an eccentricity of each of the elliptical gears is k, 0<k<0.8, an included angle between a connecting line of the first screw and the second screw and a long axis of each of the elliptical gears is , and a rotation speed of the second screw is .sub.2, satisfying ${}_2=\frac{\left(1-k^2\right)N}{1-2k\cos +k^2}.$

An extruder screw having a worm shaft and a plurality of screw elements that are releasably plugged or pluggable thereon, wherein each screw element has a defined axial minimum length or a length that corresponds to a multiple of the minimum length. The worm shaft has an external toothing and the screw elements have an internal toothing engaging therewith. The external toothing has, forming individual gear rings extending around the circumference, a plurality of recesses extending around the circumference in an offset manner along its axial length, which are spaced apart from one another by the minimum length, such that the internal toothing of each screw element extends, at both axial ends, into the region of the recess, and the ends of the internal toothing are not engaged with the external toothing.

An extruder screw having a worm shaft and a plurality of screw elements that are releasably plugged or pluggable thereon, wherein each screw element has a defined axial minimum length or a length that corresponds to a multiple of the minimum length. The worm shaft has an external toothing and the screw elements have an internal toothing engaging therewith. The external toothing has, forming individual gear rings extending around the circumference, a plurality of recesses extending around the circumference in an offset manner along its axial length, which are spaced apart from one another by the minimum length, such that the internal toothing of each screw element extends, at both axial ends, into the region of the recess, and the ends of the internal toothing are not engaged with the external toothing.