Screw assembly for disintegration of lignocellulosic material

The present invention relates to a screw assembly (10) comprising an elongated screw (2) for transporting lignocellulosic material， the elongated screw (2) comprising a screw core (21) and a screw blade (22) arranged on said screw core (21)， and an elongated screw housing (1) comprising an end wall (17) at a first end (11)， the end wall (17) having an outlet opening (13)， and the screw housing (1) further comprising an inlet portion (15) with a material inlet (14)， wherein the screw (2) is arranged in the screw housing (1) for transporting the lignocellulosic material from the inlet portion (15) to the outlet opening (13) at the first end (11)， the housing (1) being configured to extend around a circumference of the screw (2)， wherein a center (A) of the inlet portion (15) is arranged at a first distance (d1) from the first end (11)， the screw blade (22) extending in said inlet portion (15) and further extending a second distance (d2) from the center (A) of the inlet portion (15) towards the first end (11)， said second distance (d2) being smaller than the first distance (d1).