milling or water cutting jet technique the entire screen plate is only supported by a multitude of support rods 78 in fig3 is shown a conventional profile bar screen 64 according to prior art profile bars 66 are supported by horizontal support arches 65 which in turn is supported by a multitude of support rods 68 here is also shown a clean out plate 69 which could be opened in order to clean out the lower part of screen assembly both these type of screens are shown on page a537 in u201c chemical pulping u201d book 6a 1999 isbn 952 5216 06 3 as screens promoted by ahlstrom machinery now andritz in fig4 is shown a profile bar screen according to wo2013 105888 as mounted in a continuous digester the digester wall 1 is the actual pressure vessel wall and inside of the wall is the profile bar screen 2 located with vertical profile bar elements 10 facing the suspension of comminuted cellulose material as it descends down through the digester as a pulp column in the downwards direction pc the vertical profile bar elements 10 are mounted on several horizontal support arches 11 located preferably at a set vertical distance between each support arch 11 thus the force upon the profile bar screen from the pulp column is first exposed to the profile bar elements 10 and via support arches 11 to the inside of the digester wall 1 as indicated could a blind plate 32 be located above the screen bar elements 10 supported on a horizontal thrust beam 30 the upper.