Profile bar screen for digester vessels

A profile bar screen for draining treatment liquor from a suspension of comminuted cellulose material and treatment liquor in an essentially cylindrical digester vessel having an outer wall, said profile bar screen being arranged inside the outer wall of the cylindrical digester vessel thereby forming a withdrawal chamber between the outer wall of the digester vessel and the profile bar screen, the profile bar screen comprising:

• vertical profile bar elements facing the suspension of comminuted cellulose material, said vertical profile bar elements arranged in parallel to each other and forming a withdrawal slot for treatment liquor between neighboring ones of said vertical profile bar elements;
• and
• a plurality of horizontal support arches having vertical mounting slots for mounting said vertical profile bar elements in said mounting slots, the plurality of horizontal support arches having integrated support shoulders resting against the inside of the outer wall of the cylindrical digester vessel, each of said plurality of horizontal support arches having only two of said integrated support shoulders located at each respective end of each of said plurality of support arches whereby the plurality of horizontal support arches between said integrated support shoulders is located at a distance from the outer wall of the cylindrical digester vessel, enabling a free unobstructed flow of withdrawn cooking liquor between said outer wall of said cylindrical digester vessel and said plurality of horizontal support arches and between said two integrated support shoulders in each of said plurality of horizontal support arches.