Cutting screen with evenly distributed cutting surfaces

A cutting screen for use in wet shredders with an inner edge area and an outer edge area, wherein the cutting screen has a working area between the inner and outer edge areas consisting of empty sections and material sections, and wherein the working area is constructed to be swept over by at least one cutting edge during operation, wherein:

• a circumferential ratio UV is the ratio of accumulated lengths of material sections AM along a circumferential line to a circumference U associated with the circumferential line:
• U
• ⁢
• V
• =
• ∑
• U
• A
• M
• U
• wherein, for the cutting screen, there exists at least one continuous circumferential function F without changes in curvature, which maps circumferences U to a reference circumferential ratio RUV:
• F
• :
• U
• →
• R
• ⁢
• U
• ⁢
• V
• and wherein the circumference ratio UV for each circumference U of a circle concentric with the working area of the cutting screen and lying within the working area does not deviate from the reference circumference ratio RUV=F(U) by more than 0.05 of the reference circumference ratio (RUV) at the respective circumference.

A system for shredding solids in mixed fluids, comprising a wet shredder having a cutting screen with an inner edge area and an outer edge area, wherein the cutting screen has a working area between the inner and outer edge areas consisting of empty sections and material sections, and wherein the working area is constructed to be swept over by at least one cutting blade during operation, wherein:

• a circumferential ratio UV is the ratio of accumulated lengths of material sections AM along a circumferential line to a circumference U associated with the circumferential line:
• U
• ⁢
• V
• =
• ∑
• U
• A
• M
• U
• wherein, for the cutting screen, there exists at least one continuous circumferential function F without changes in curvature, which maps circumferences U to a reference circumferential ratio RUV:
• F
• :
• U
• →
• R
• ⁢
• U
• ⁢
• V
• and wherein the circumference ratio UV for each circumference U of a circle concentric with the working area of the cutting screen and lying within the working area does not deviate from the reference circumference ratio RUV=F(U) by more than 0.05 of the reference circumference ratio (RUV) at the respective circumference.

A wet shredder comprising:

• a housing;
• a fluid inlet;
• a fluid outlet;
• a rotor driven by a drive;
• and
• a cutting screen disposed between the fluid inlet and the fluid outlet, wherein the cutting screen further comprises an inner edge area and an outer edge area, a working area between the inner and outer edge areas consisting of empty sections and material sections, wherein the working area is constructed to be swept over by at least one cutting blade during operation, and wherein:
• a circumferential ratio UV is the ratio of accumulated lengths of material sections AM along a circumferential line to a circumference U associated with the circumferential line:
• U
• ⁢
• V
• =
• ∑
• U
• A
• M
• U
• wherein, for the cutting screen, there exists at least one continuous circumferential function F without changes in curvature, which maps circumferences U to a reference circumferential ratio RUV:
• F
• :
• U
• →
• R
• ⁢
• U
• ⁢
• V
• and wherein the circumference ratio UV for each circumference U of a circle concentric with the working area of the cutting screen and lying within the working area does not deviate from the reference circumference ratio RUV=F(U) by more than 0.05 of the reference circumference ratio (RUV) at the respective circumference.