Screen plate and pulp screening machine

A screen plate (100) for a pulp screening machine having a rotor (110) with a vane having a front edge, comprising:

• a main body;
• and
• concave grooves (120) on the main body on a surface of the screen plate (100) towards the rotor (110) of the pulp screening machine, each concave groove (120) extending across a length between a bottom end and a top end, wherein
• the screen plate (100) is configured to be arranged to provide an even gap between the vane of the rotor (110) and the surface of the screen plate (100) toward the rotor except in a region with a groove (120), and with the front edge of the vane of the rotor (110) at an angle to the length of each of the grooves (120), and
• the concave grooves (120) of the screen plate (100) are configured and positioned to form angles of greater than 90° relative to the front edge of the rotor vane across the entire length of the respective grooves (120).