flat zone r 2 is the outlet radius of the disc at the end of the conical zone fig 1 for r r c the consistency c cz is given by c cz 1 1 c i u2062 u2062 2 r c 2 r 1 2 r 2 2 r 1 2 u2062 e 0 l 5 c i u2062 u2062 2 prod prod c p dilution infeed dilution fz dilution cz 6 where dilution cz is the conical zone dilution and c i2 is the consistency at the point where dilution occurs in the conical refining zone and then for any given r after r c the consistency c cz is given by c cz 1 1 c i u2062 u2062 2 r 2 r 1 2 r 2 2 r 1 2 u2062 e 0 l 7 the discharge consistency or the blow line consistency c bl is obtained when r r 2 given by c bl 1 1 c i u2062 u2062 2 0 0016 u2062 e 0 8 this last equation shows that the same blow line consistency c bl is obtained by more than one possible way of combining in feed dilution flat zone dilution and conical zone dilution each one of these combinations would result in a different consistency profile along the refining zones and therefore different average refining consistency to illustrate that fig 4 shows an example of two consistency profiles profile 1 where all the dilution water is added at the in feed this resulted in a low inlet consistency profile 2 corresponds to a certain repartition of the total dilution flow between in feed flat zone and conical zone as.